Definition

What is a laser cutter? And how are works for laser cutting machine? Let’s dive into it.

Laser cutting machine: a laser beam that will be fired from the laser generator, which is focused into a laser beam with high power density through the optical path system.

fiber-laser-cutter

The laser beam hits the surface of the workpiece so that the workpiece reaches the melting point or boiling point, while the high-pressure gas that is aligned with the beam will blow away the melt or vaporized metal.

With the movement of the beam and the relative position of the workpiece, the material is finally cut and slit so as to achieve the purpose of cutting.

Laser cutting is used to replace the traditional mechanical knife with invisible beams. It featured high precision, fast cutting, not limited to cutting pattern limitation, automatic typesetting saving material, smooth incision, low processing cost.

Besides, laser cutting also has following advantages:

The laser cutting method will gradually improve or replace the traditional metal cutting process equipment.

  • The mechanical part of the laser cutter has no contact with the workpiece, and it will not scratch the surface of the workpiece at work.
  • The laser cutting speed is fast and the incision is smooth and no need for subsequent processing.
  • The cutting heat affected area is small, the plate deformation is small, and the slit is narrow (0.1mm~0.3mm).
  • No mechanical stress, no shear burr.
  • High machining accuracy, good repeatability, no damage to the material surface.
  • Numerical control programming can process any plane graph
  • Can cut a large piece of the whole plate without opening the mold and saving time.

See also:

Laser Cutting Machine Working Principle

Laser Cutting Machine Working Principle

Laser cutting uses the laser beam as the heat source for hot cutting, its working principle is similar to laser welding.

The temperature of laser cutting exceed 11000 ℃, which would have made any material gasification, therefore gasification also plays an important role in addition to the melting during laser cutting process.

The laser cutting process of some materials, such as carbon and some ceramics, purely belongs to the gasification process.

The laser cutting of metal mostly adopts high power carbon dioxide continuous laser generator.

When cutting, spray the inert gas flow, blow out the incision to melt the metal, and make the incision smooth and straight. The jet’s oxygen flow will increase the cutting speed.

The laser cutting has a narrow incision, precise size, smooth surface and better cutting quality than any other hot cutting methods.

Almost all metal materials can be cut by laser, the cutting thickness various from a few microns to a sheet of 50 mm.

The investment of laser cutting equipment is high, it is mainly used for various thickness under 12 mm including stainless steel, titanium and titanium alloy, refractory metal and precious metal precision cutting, can also be used for non-metallic materials cutting such as plastic, wood, cloth, graphite and ceramic.

For example, wood processing industry already uses the laser to cut plywood, particle board and garment industry also use the laser for a large number of cutting cloth.

In addition, laser cutting is also suitable for some special purposes, such as the stone bearing drilling, the surgeon using the laser as the scalpel.

The parameters of the laser beam, the performance and precision of laser cutting machine and NC system will directly affect the efficiency and quality of laser cutting.

Laser Cutter Structure

Laser Cutter Structure

The main components of CNC laser cutter are machine host part, control system, laser, chiller, regulator and so on.

Most of the above parts have their own manual or operating instructions, the main machine, structure and composition of the electrical control system will be elaborated here.

 

fiber laser cutter frame

Machine host part:

The machine host part of the laser cutting machine is the most important part of the laser cutting machine.

The cutting function and cutting accuracy are achieved by the host part.

The host part including 6 parts:

the bed, laser, gantry part, Z axis device, auxiliary parts of the working table (protective cover, air, and water channel), the operation panel.

Electrical control part:

The electrical control system of the laser cutting machine is the main part to ensure that a variety of graphics trajectory.

Generally, the electrical control system mainly composed of the numerical control system and low voltage electrical system.

The laser cutting machine is equipped with CYPCUT software, and this system is based on WINDOWS XP operating platform, stable and reliable operation, including 32-bit microprocessor, ethernet communication interface.

The system featured fast interpolation operation speed, easy to operate, good dynamic performance, strong load capacity.

The control part of the low-voltage electrical system is located in the electric control cabinet, which is the interface part of the electrical control.

The components of the electrical part adopt world well-known brand to ensure the stable running and sensitive response.

Drive motor is the AC servo motor, which used for driving the X-axis gantry, Y-axis skateboard of the laser cutter.

It characterized by good accelerated performance, fast response.

The maximum positioning speed is up to 50m / min.

The Z-axis of the laser cutting machine is the feed axis, which uses AC servo motor for driving.

The Z-axis cutting head, characterized by the good dynamic response, that is, can be controlled by both servo and NC control.

The overall structure

desktop fiber laser cutter's cooling, lubrication and dust removal system

The main part of the machine is the most important part of the whole laser cutting machine.

The cutting function and cutting precision of the laser cutting machine is realized by the host part which composed of the bed (Y axis), the beam (X-axis), Z axis, working table, air and water channel.

Laser cutting machine’s frame part

The bed is made of high-strength cast iron with integrally welded structure, annealed to eliminate casting stress, vibratory stress relief after roughing → semi-finishing → vibratory stress relief → finishing.

Stress reduction is more thorough, reducing the deformation of the machine to ensure that the accuracy for a long time.

Through the numerical control system to control the AC servo motor drive, coaxial drive beam to achieve the reciprocating motion of Y-axis, and achieve rapid movement as well as fast feed movement.

The movement stroke of 1500mm * 3000mm.

Gear rack and linear guide adopt closed dust-proof device, featured lightweight dust cover and reliable operation.

Gear rack and linear guide are used precision products, effectively guarantee the accuracy of the drive.

Stroke at both ends of the limit switch control, supplemented by both sides of the elastic cushion, effectively ensuring the safety of laser cutting machine’s movement.

Beam section

The beam part is welded with the whole high strength square tube, machining after artificial aging, to ensure the overall rigidity and strength.

The processing flow is rough processing → vibration aging → semi-finishing → vibration aging → finishing.

The beam is mounted on the support rail of the bed (the guide rail has a linear guide rail and a flat guide rail) and is equipped with high-quality linear guide rails,  and servo motor drive gear rotation through the reducer, so that Z-axis skateboard to achieve X-direction reciprocating motion, the movement stroke is 1450mm.

During the course of the movement, the limit switch controls the stroke, and there are elastic cushions at both ends to ensure the safety of the system.

The upper and both sides of the beam are enclosed by a cover, and a retractable organ guard is provided between the beam and the transverse skateboard to ensure that the rack and the linear guide are operated in a fully enclosed environment without being affected by the external environment.

The optical path is partially sealed with an organ shield to achieve a fully enclosed structure of the optical path.

Exchangeable workstation base and workstations (optional)

Workstations adopt the overall welding structure, with good strength and stability.

The exchange table is divided into two parts, which are composed of a switching device and two movable cutting tables.

The exchange device is fixed on the back side of the bed, mainly to complete the upper and lower exchange of the two tables.

When cutting the workpiece, the other cutting table can be used to feeding and unloading material which will improve the efficiency of the laser cutting machine.

Two movable cutting table is composed of a welding frame, above have the workpiece support gate.

The worktable can load 800KG.

Two tables can achieve automatic exchange through the chain device drive, greatly improving production efficiency.

The center of the table is equipped with universal ball seat, there are four universal balls in the middle of the table to support 44 workpieces, through the cylinder drive rack and pinion mechanism can swing pole 180 °.

Feeding the spiral tube quick connector into the quick connector of the cutting station, open the pneumatic switch, so that the cylinder drive through the rack and pinion.

Rotate the swing pole upward 180°, 44 universal balls support the workpiece, the workpiece can roll on the universal ball to avoid the workpiece sliding in the support of the grid, resulting in scratches.

When the workpiece positioning, press the pneumatic switch, the cylinder will swing down 180 ° through the rack and pinion mechanism, the universal ball just below the pendulum to avoid the ball was burned during the cutting process.

As the workpiece is rolling on the ball in the feeding and positioning, rather than the traditional support (the workpiece sliding on the support grid), this mechanism can effectively protect the smooth workpiece in the feeding and positioning process, reducing the operator’s labor intensity.

Z-axis device

The Z-axis device is a portion that realizes the lifting movement of the cutting head.

The lifting movement of the cutting head is realized by the numerical control system control the servo motor. The motor drives the ball screw to drives the Z-axis skateboard do reciprocating motion up and down.

The travel of Z-axis is 100mm;

The upper and lower ends adopt the close switch to control stroke, both ends of the ball screw have a flexible cushion to ensure the safety of the movement.

Ball screw and linear guide are used high-quality products to ensure the accuracy of the transmission.

Z axis can be used as a CNC axis for its separate interpolation movement and can move together with X, Y axis.

It can also switch to servo control through the electronic control part of the cutting head to meet the needs of different situations.

As the Z-axis servo control is controlled by the CNC system, so the accuracy of the servo control is relatively high and stability is better, thus ensuring the quality of cutting.

The cutting head is sealed and resiliently cushioned to ensure the life of the cutting head.

The capacitance sensor (mounted on the cutting head) in the Z-axis device detects the distance from the nozzle to the surface of the plate, feeds the signal back to the control system.

Then controls the Z-axis motor to drive the cutting head up and down by the controller which will control the distance between the nozzle and plates remain the same and the quality of the cutting is effectively ensured.

The cutting head has a nut that adjusts the focal length and adjusts the position of the focus according to the material and thickness of the cutting material, thereby obtaining a good cutting section.

“Note”:

the nozzle is one of the wearing parts of the process, the user can spare some nozzle with the different diameter to facilitate the replacement.

Electrical control section

The electrical control system of CNC laser cutting machine mainly composed of the numerical control system, servo system, and low voltage electrical system.

The laser cutting machine composed of CYPCUT CNC system which is based on the WINDOWS XP PC CNC system, with fast interpolation operation speed and easy operation.

The servo system uses the Japanese Yaskawa AC servo motor and drive, which is stable, reliable, good dynamic performance and strong load capacity.

The front panel of the laser cutting machine has two function buttons, two operation soft keys and two front USB ports (from left to right are emergency stop switch, power switch, cutting start button, cutting stop button).

The operating soft keys have different functions in different modes.

The operating soft keys can have different functions in different modes of operation, thereby reducing the operation buttons and simplifying the operation panel.

In various ways, the operation function is displayed by the menu, making the operation intuitive.

Laser Cutter Types

Laser Cutter Types

If based on the laser generator, the laser cutter can be divided into:

A. solid laser cutter. The solid laser cutter can be divided into the bonus stones laser cutter, YAG laser cutter.

B. semiconductor laser cutter.

C. liquid laser cutter.

D. gas laser cutter.

See also:

 

If based on the structure, the laser cutter can be divided into:

  1. According to the relative movement of the cutting head and the table, the CNC laser cutting machine can be divided into:
  • Beam fixed form (fixed light path)
  • Beam movement form (flying ray)
  • Semi-fixed and semi-mobile hybrid form

Besides, there is also an articulated movable arm fixed optical flight beam transmission form, known as a constant flight path.

In the cutting process for the laser cutter which adopts flying ray, only the cutting head moves along the X and Y direction, and the position of the table is fixed.

Such laser cutter featured:

  • The plate of processing is in big size, with a heavyweight.
  • The equipment covers a small area.
  • No need clamping for fabricating workpiece which is convenient for loading and discharge the materials.
  • The machine has good acceleration and high positioning accuracy.

Therefore, it is highly regarded by the market as the mainstream model of the international market.

 

  1. Several typical structures of modern laser cutting machines are mainly included:
  • Gantry frame movable flying ray structure.
  • Beam traveling flying ray.
  • Beam upside down movable flying ray.
  • Cantilever movable flying ray structure.
  • Robot structure & Large format hybrid flying ray.
  • Laser flexible processing system.

 

  1. In terms of the structure of the laser cutting equipment, the frame of the machine include:
  • casting structure
  • welding structure
  • marble structure
  • the beams are made of aluminum alloy castings or welds and profiles.

Other components use engineering plastics, fiberglass and stainless steel, etc.

 

  1. The laser generator required by the laser cutter shall be selected according to the user’s processing performance, processing materials, shapes and sizes, etc.

The available laser generators include co2 axis fast-flow laser generator, RF board debugging laser generator, swirl laser generator, the solid-state laser generator and a fiber laser generator.

 

  1. Based on the driving method, there are:
  • X and Y axis are selected with a single – side servo motor and equipped with the corresponding speed reducer, which is driven by the high precision gear rack.
  • The X axis is selected with the servo motor and equipped with the corresponding reducer, which is driven by the high precision gear rack. There are two gears to eliminate reverse clearance.
  • Directly driven by high precision ball screw with the servo motor. The machine is driven by direct gear and rack with disc large inertia motor.
  • Direct drive by the linear motor.

 

  1. CNC laser cutting machine is usually equipped with the high precision linear guide, and equipped with an automatic lubrication device.

Single-side linear guide rail with roller structure is a typical structure of the cost-effective economic application and convenient adjustment. The other kind of structure is the drive unit structure which directly adopts the combination of drive and guide rail. It is easier to install, easier to debug, easier to ensure the precision, and just a little bit more expensive.

Installation and Commissioning of Laser Cutting Machine

Installation and Commissioning of Laser Cutter

The installation and commissioning of the laser cutting machine are very important for every factory, so please keep reading the following details before the operation.

Delivery check

Unpacking precautions:

Please open the wooden box according to the tips outside the box, so as to avoid damage to the laser cutter equipment inside the box. Please do not use sharp objects to open protective film so as not to cause the equipment surface scratches and damage the protection of pipeline electrical installation. If the customer caused the damage, the company is not responsible for the replacement.

Check the contents

A) After opening the package, please confirm whether this is the laser cutter you purchased.
B) Check if the laser cutter is damaged during transport.
C) Check the list to confirm whether the parts are complete, with or without damage.
D) If there is a laser cutter’s model does not match, lack of accessories or have transport damage, etc., please contact the company.

Installation environment requirements

Installation and fixed laser cutting machine please refer to the factory Foundation map, transport according to the lifting position. Please employee professional electrician does power distribution wiring in accordance with the requirements, shall not damage the machine during installation and fixing.

Installation methods and precautions

Install and fix the laser cutting machine according to the plant Foundation map and install according to our proposed principle of the layout, installation, and fixing shall not damage the laser cutting machine.

Commissioning methods and related instructions

Machine commissioning requires professional staff, must be strictly in accordance with the relevant provisions of the implementation, please understand the performance of the laser cutting machine before reading and read the relevant random technical information. The correct commissioning is to ensure the normal work of the machine, if unknown, please contact us promptly, we will be in the fastest time, give you a satisfactory answer.

Note: This debugging method includes the commissioning method after the machine is powered on.

The connection between the parts of the distribution cabinet

First of all, locate the parts according to the requirement, as shown below:

laser cutter's bed layout

After the installation is completed, make the connection between each distribution cabinet:

A) First check whether the three joints at the end of the Y-axis extension damaged in the transport process (three plugs are: 16-core heavy-duty connector, 19-core aviation plug, 4 encoder plug and an amplifier plug ) As shown below:

aviation plug

Aviation Plug

heavy-duty connector

Heavy-duty Connector

encoder plug

Encoder Plug

amplifier plug

Amplifier Plug

B) Insert the existing plug in place (the position is unique), insert the encoder plug into the corresponding servo drive according to the above number, and insert the amplifier plugged into the height adjuster.

C) Connect the water cooler power cord in the power distribution cabinet to the specified location, as shown below:

Power Plug

Power Plug

Power Plug Connection Position

Power Plug Connection Position

D) to connect the main power (we are using three-phase four-wire system, yellow and green line for the zero line, the remaining three for the fire line). In summary, the electrical external circuit connection has been completed, in the next section, we discuss the waterway connection.

“Warning”:

The ground wire of the power cord must be grounded reliably. Otherwise, the signal inside the machine cabinet will be disturbed and encountered a risk of leakage.

The connection method of water cooler

Installation conditions

Chillers should be placed smoothly and have a certain distance from the wall. The chillers installation site must have enough air inlet and outlet space to prevent poor cooling of the chiller, water cooler fan cannot face the distribution cabinet, otherwise, it may cause the cabinet high temperature.

Inspection of the machine

First, clean up the debris inside the water tank to ensure that the water inside the tank clean and have no impurities; and then check whether the water pipe system joints loose.

Installation method

Connected to the inlet and outlet pipes in accordance with the signs on the chiller shell, connected with the inlet and outlet door of the laser, should not dislocate the direction of the inlet and outlet of the water pipe, before connecting the water pipe, should ensure that the outside pipe of the chiller without garbage and foreign matter.

Water quality standards

Check whether the sewage valve is closed and add water to the tank. The water level should be less than 30mm to 50mm on the tank to prevent water from overflowing. Chilled water units do not allow the use of general tap water, must use high-quality pure water, distilled water or deionized water. It is strictly forbidden to add any corrosive liquids.

Power on commissioning

There is an air switch behind the water cooler, open the switch to test running when the water channel is connected well. After the pump operated, check the various joints with or without water leakage, if there is, turn off the power, and then turn on the power when the problem solved.

Regulation of water temperature

In the air-conditioned room, the water temperature is generally set at 22-24 degrees Celsius; in the air-conditioned room, the water temperature is set lower than room temperature 2-5 degrees Celsius (pipe wall is not condensation as the appropriate temperature, if the water condensate, indicating that the temperature of water cooler set too low)

Nozzle effect and adjust laser at nozzle mouth

Nozzle action and regulation

A) Nozzle

Nozzle design and jet flow conditions have a direct impact on the quality of cutting; nozzle manufacturing accuracy is closely related to cutting quality.

B) The main functions of the nozzle:

▲ to prevent cutting debris and other debris up bounce into the cutting head and damage the focus lens.

▲ the nozzle can change the cutting gas discharge situation, can control the gas diffusion area and size, thus affecting the cutting quality.

The figure below shows the ejected case where the nozzle is installed and not installed.

laser cutter's nozzle

Steps to adjust the nozzle to pass the laser from the center of the nozzle

Compared to CO2 laser cutting machine, fiber laser cutting machine is no optical path, only need to adjust the laser at the nozzle mouth.

1) coated the end of the nozzle with the Indian mud (with a transparent tape if not use the mud), then attached the white stickers to the end

2) adjust the laser output power 30W ~ 50W, open the mechanical shutter, and then quickly switch the electronic shutter once, and observe the phenomenon. Then, turn off the mechanical shutter, take the white stickers down, be careful not to turn its relative position. If the nozzle position and the laser center difference is too large, stickers will not be able to play the center hole; Since the laser center is fixed, the center of the nozzle is changed by adjusting the adjustment screw on the cutting head handle to correspond to the laser center. Repeat the above action until the laser hole on the white sticker coincides with the center of the nozzle, thus confirming that the laser center coincides with the nozzle center. As shown below:

laser nozzle center

Effect of the nozzle on cutting quality and nozzle size selection

The relationship between the nozzle and cutting quality:

When the center of the nozzle is different from the center of the laser, the effect on cutting quality:

1) affect the cutting section

When the cutting gas in the jet, resulting in uneven gas volume, so that the cutting section is more prone to the side of the stairs, the other side doesn’t have. For cutting the sheet below 3mm, its impact is small, while cutting the plate above 3mm, its impact is more serious, sometimes cannot cutting.

2) affect the sharp corners
In the cutting of sharp corners or smaller angle of the workpiece, prone to the local over-melting phenomenon, may not be cut when cutting thick plate.

3) affect the perforation
In the piercing instability, time is not easy to control, the penetration of the thick plate will cause the situation of melting, and the penetration conditions are not easy to grasp, the impact on small pieces perforation is small.

In summary, the center of the nozzle and the concentricity of the laser is one of the important factors contributing to the quality of cutting, especially when the workpiece is thicker, its impact is even greater. Therefore, it is necessary to adjust the center of the nozzle with the laser concentricity to obtain a better cutting section.

Note: When the nozzle is deformed or there is fouling on the nozzle, its effect on the cutting quality is the same as described above. Therefore, the nozzle should be placed carefully and not bruised to avoid deformation. The stains on the nozzle should be cleaned. The quality of the nozzle in the manufacture has higher precision requirements, the installation also required the correct method. If due to the poor quality of the nozzle caused to change the various conditions when cutting, should promptly replace the nozzle.

Selection of nozzle aperture

The difference in nozzle diameter is shown below:

Selection of nozzle aperture

The diameter of the nozzle has φ 1.0mm, φ 1.4mm, φ 2.0mm, φ 2.5mm, φ 3.0mm and so on. The current nozzle diameter often uses φ 1.4mm, φ 2.0mm. As shown below:

1.4mm 2.0mm nozzle

The difference between the above two diameters is:

1) the thin plate below 3mm: the use of φ4mm, the cutting surface will be smaller; the use of φ2mm, the cutting surface will be thick, easy have melted stains at the corner place.

2) the thick plate above 3mm: the cutting power is higher, the relative heat dissipation time is longer, the relative cutting time also increased. Use φ1.4mm, the gas diffusion area is small, so when used is not stable, but basically still available. Use φ2mm, gas diffusion area is big, the gas flow rate is slow, so the cutting is more stable.

3) 2.5 mm in diameter, can only be used for more than 10mm thick plate cutting.

In summary, the nozzle size has a serious impact on the cutting quality and perforation quality. The current laser cutting machine more use φ 1.4mm, φ 2mm aperture nozzle.

“Note”: the larger the nozzle aperture, the worse the relative protection of the lens, because the spark splash of the melt when cutting, there is the big possibility for it go upward, making the lens life shorter.

Beam focus adjustment

In the laser cutting process, the relative position of the beam focus and the surface of the cutting sheet has a great influence on the quality of the cutting, and it is very important to properly adjust the focus position. Generally can be changed by changing the focus of the test cut, when the back is not hanging slag and the smallest cut when the corresponding steel plate is the focus of the location.

After the change of the relative position of cutting head and the board, the cutting head and the sensor zero points also need to be changed, micro-adjustment can be completed by adjusting the cutting height of the software; when the amount of adjustment is large, it is necessary to adjust the sensor and the relative position of the bracket to complete focus adjustment. Be careful to do this work, otherwise, it is easy to cause cutting head hit downward, causing damage to parts.

The relationship between the focus position and the cutting effect

Name and focus position Cutting material and cross-section characteristics
Zero focal length: focus on the cutting surface of the workpiece Carbon steel cutting instructions
Focus on the surface of the cutting bow and arrow, the upper surface is smooth, the lower surface is not smooth
Positive focal length: the focus in the inside of cutting bows Aluminum cutting instructions
The focus in the central, so there is a larger smooth surface, cutting width wider than the zero focal, large air flow during cutting, perforation time longer than the zero focal
Negative focus: focus below the cutting bows Stainless steel cutting instructions
Stainless steel cutting with high-pressure nitrogen, blown away molten slag to protect cutting section, cut width increased with the workpiece thickness

Cutting speed selection

The cutting speed of the laser cutting machine is selected according to the cutting plate material, the thickness of the plate, different cutting speed will cause a great impact on the quality of the laser cutting machine. Choose the appropriate cutting speed both can improve the efficiency of the laser cutting machine, but also get a good cutting quality. Here is the impact on cutting quality with different cutting speed:

The effect on cutting quality with too fast laser cutting feed rate

  • may cause no cutting, sparks scattered.
  • Some areas can be cut off, but some areas cannot be cut off.
  • resulting in the entire cutting section thicker, but no fusible generation.
  • cutting feed rate is too fast, resulting in the plate cannot be cut off in time, cutting section showing oblique lines, and the lower part generate fused stains. As shown below:

effect on cutting quality with too fast laser cutting feed rate

 

The effect on cutting quality with too slow laser cutting feed rate:

  • caused the cutting plate over-melting, with the rough cutting section.
  • the slit will be widened accordingly, cause the entire area melting in the smaller fillet or sharp corners, cannot get the ideal cutting effect.
  • low cutting efficiency, affecting production capacity.
  • the appropriate cutting feed speed choice: from the cutting sparks can determine the feed speed: the general cutting sparks are spread from top to bottom, if the sparks tilt, the feed rate is too fast; if the spark does not spread and less, condensed together, then the feed rate is too slow. With appropriate cutting speed, the cutting surface showing a smoother line, and the lower half of the plate do not fuse.

As shown below:

effect on cutting quality with too slow laser cutting feed rate

Laser cutting gas and pressure selection instructions

According to the different material of the cutting, plate to choose a different cutting gas. The choice of cutting gas and pressure has a great impact on laser cutting quality. The main function of cutting gas: combustion and heat dissipation, in a timely manner to blow off the welding of the stains, to prevent cutting stains upward into the nozzle, protect the focus lens.

Effect of cutting gas and pressure on cutting quality

1) cut the gas to help heat and combustion, blowing away the stain, so as to get a better quality cutting section.

2) When the pressure of the cutting gas is insufficient, it will have the following effects on the cutting quality: the fouling occurs at the time of cutting, and the cutting speed cannot satisfy the influence of the production efficiency.

3) When the pressure of the cutting gas is too high, the impact on the cutting quality: cutting surface is rough and wide slots; at the same time will cause part of the section melting, cannot form a good cutting section.

Effect of cutting gas pressure on perforation

1) When the gas pressure is too low, the laser is not easy to penetrate the cutting plate, drilling time increases, resulting in low productivity.

2) When the gas pressure is too high, resulting in penetration point melting, format a larger melting point, thus affecting the quality of cutting.

3) laser drilling general use high sheet metal punching pressure, while the thick plate of the punch makes use of lower gas pressure.

4) in cutting ordinary carbon steel, the thicker of the material, the relatively lower pressure of the cutting gas. In the cutting of stainless steel, although the cutting gas pressure does not change relative to the thickness of the material, the cutting gas pressure is always in a high state.

In short, the selection of laser cutting gas and pressure must adjust according to the actual situation, need to select different cutting parameters according to the specific circumstances in specific applications. Our laser cutting equipment will be reserved two gas pipeline before delivered, while oxygen and air use one pipe, nitrogen alone use a high-pressure pipe. Two gas channels must be connected with the pressure reducing valve, as shown below:

Pressure relief valve

Pressure relief valve description: the left side of the table shows the current pressure, the right table shows the remaining gas capacity.

“Warning”

  • Nitrogen supply pressure should not exceed 20kg;
  • Oxygen supply pressure should not exceed 10Kg, or likely to cause the gas pipe burst.

Laser cutting power impact on cutting quality

The choice of laser power size also have a certain impact on the cutting quality, cutting power should be determined according to the material and the thickness of the plate, too large or too small power will not ensure to get a good cutting section.

A) Too small laser power will cause no cutting.

B) When the laser power setting is too large, the entire cutting surface is melted, the slit is too large, and good cutting quality is not obtained.

C) When the laser power setting is insufficient, the cutting fouling will occur and the scars will be generated on the cutting section.

So set the appropriate laser power, with the appropriate cutting gas and pressure, can get a good cutting quality, no fused stain on it.

Laser Cutter Safety

Laser Cutter Safety

See:

 

Specifications

1. Dedicated device.

In order to reduce the change of focal spot size caused by the change of beam size before focusing, the manufacturers of laser cutting system provide some special devices for users to choose:

(1)Parallel optical tube.

This is a commonly used method, which is to add a parallel optical tube to the output end of the CO2 laser.

The beam diameter becomes larger and the divergence angle becomes smaller so that the near end and the far end of the beam are close to the same size.

(2)Add an independent moving lens to the lower shaft of the cutting head.

It is independent of the Z-axis that controls the distance between the nozzle and the material surface.

When the machine tool table moves or the light axis moves, the beam from the near end to the far end of the F-axis also moves simultaneously, so that the beam’s focal spot diameter remains consistent throughout the processing area.

(3)Control the water pressure of the focusing mirror, which is usually a metallic reflection focusing system.

When the focus beam size becomes smaller and the focal spot becomes larger, the focal curvature of the focal spot will be reduced by automatically controlling the water pressure change.

(4)An x and y-directional compensation optical path system are added to the flying ray cutting machine.

That is, the compensation optical path is shortened when the distance of far end cutting is increased. On the other hand, when cutting the near end of the optical path decreases, the compensation flying ray is increased to keep the length of the optical path consistent.

2. Cutting perforation technology.

Any kind of hot cutting technology, except a few cases, can start from the edge of the board, generally must drill a small hole in the plate.

Earlier, the laser punch was used to punch out a hole first, then the laser was cut from the hole.

There are two basic methods for the laser cutting machine without the stamping device:

(1)Blast drilling:

After continuous laser irradiation, the material formed a pit in the center, and then it was quickly removed by the oxygen flow with the laser beam.

The average hole size is related to plate thickness, and the average diameter of blasting holes is half of the plate thickness.

Therefore, the large hole diameter and bad roundness determined it is not suitable to use on parts with a high requirement (such as oil screen seam pipe), and can only be used for scrap.

In addition, the oxygen pressure used in the perforation is the same as that of the cutting. The splash is very serious.

 

(2)Pulse drilling

A pulsed laser with a peak power is used to melt or vaporize a small amount of material. Common air or nitrogen is used as an auxiliary gas to reduce the hole expansion due to exothermic oxidation. The oxygen pressure is less than that during cutting.

Each pulsed laser produces only small particles that are ejected in depth, so it takes a few seconds for the thick plate to perforate.

Once the perforation is completed, the auxiliary gas is immediately replaced with oxygen for cutting.

In this way, the perforated diameter is smaller, and the perforation quality is better than that of blast drilling.

The laser should not only have high output power, but also the time and space characteristics of the beam.

Therefore, the general CO2 laser generator cannot meet the requirements of laser cutting.

In addition, the pulse perforation should also have a reliable gas path control system to realize the control of gas type, gas pressure switching and perforation time.

In the case of pulse perforation, the transition technology from the pulse perforation of the workpiece to the continuous cutting of the workpiece should be emphasized in order to obtain the high-quality incision.

In theory, the cutting conditions that normally change the acceleration section include: focal length, nozzle position, gas pressure. But it is unlikely that the above conditions will be changed for too short a time.

 

3. Nozzle design and air flow control technology.

NOZZLE Design

When the laser cuts steel, the oxygen and focused laser beam are shot through the nozzle to the cut material to form an airflow beam.

The basic requirement of airflow is that the air flow into the incision should be large and the speed is high so that enough oxidation can make the incision material sufficiently exothermic.

At the same time, there is enough momentum to blow out the molten material.

Therefore, in addition to the beam quality and its control directly affect the quality of cutting, the design of the nozzle and air flow control (such as nozzle pressure, workpiece position in the air, etc.) is also very important factors.

The laser cutting nozzle uses a simple structure, namely a tapered hole with a small round hole. Experiments and error methods are usually used for design.

Because the nozzle is generally made of copper, the volume is small, and it is the vulnerable part, so it needs to be replaced frequently, therefore the fluid mechanic’s calculation and analysis are not carried out.

When used, the gas from the side of the nozzle to a certain pressure Pn(the pressure in gauge is Pg) is used to refer to the nozzle pressure. The gas is ejected from the nozzle outlet and reaches the surface of the workpiece at a certain distance. The pressure is called the cutting pressure Pc, and finally, the gas expands to the atmospheric pressure Pa.

The research shows that with the increase of Pn, the flow velocity increases and the Pc increases.

The following formula can be used to calculate the airflow speed:

V=8.2d2(Pg+1)

V- gas flow velocity L/min

d- nozzle diameter mm

Pg-nozzle pressure(gauge pressure)bar

 

For different gases, there are different pressure thresholds. When the nozzle pressure exceeds this value, the airflow is the normal oblique shock wave and the gas velocity transitions from subsonic to supersonic.

This threshold is related to Pn, Pa ratio and freedom degree (n) of gas molecules: such as oxygen, air n=5. Therefore, the threshold Pn=1bar x (1.2)3.5=1.89bar.

When the nozzle pressure is higher Pn/Pa=(1+1/n)1+n/2 (Pn=4 bar), the normal oblique shock wave is transformed into a positive shock wave.

The cutting pressure Pc decreases, the airflow speed is reduced, and the vortex is formed on the workpiece surface, which weakens the function of the airflow to remove the molten material and affects the cutting speed.

Therefore, the tapered nozzle of the small round hole at the end is used, the pressure of the oxygen nozzle is often below 3bar.

 

Laser Cutter Buying Guide

Laser Cutter Buying Guide

1. To understand the scope of your company’s production, processing materials and cutting thickness, etc., to determine the models, size and amount of the laser cutter which need to be purchased. Make a simple setup for the later purchase.

Laser cutting machine applied in many industries including mobile phones, computers, sheet metal processing, metal processing, electronics, printing, packing, leather, clothing, industrial fabrics, advertisement, crafts, furniture, decoration, medical apparatus and instruments.

The most popular model in the market is 3015 and 2513, which is 3×1.5m and 2.5×1.3m (width x length of the bed side). However, the size of the laser cutter is not a problem, generally, the suppliers will provide laser cutter with various size for customer choosing. Besides, it can also be customized.

2. Professional personnel to conduct on-site simulation solution or provide solutions, at the same time, can also take their own materials to the manufacturers for sample making.

1)Thin cutting seam

The slit of laser cutting is usually 0.10mm-0.20mm;

2)Smooth cutting surface

Whether there is the burr in the cutting surface of laser cutting.

Generally speaking, YAG laser cutting machine has somewhat burr, mainly determined by cutting thickness and gas.

Generally, there is no burr under 3mm. Nitrogen cutting works best, the oxygen cutting effect is second, the air cutting effect is worst.

The fiber laser cutting machine has the fewest burr, the cutting surface is very smooth and the speed is very fast.

3)Check the deformation of the material.

4)Laser power

For example, if the majority of the factory is to cut the metal plates below 6mm, there is no need to buy high-power laser cutting machine, and the 500W fiber laser cutting machine can meet the production demand.

If production is bigger, and worry about the cutting efficiency of the 500w laser cutter is not good than the high power laser cutting machine, the best option is to buy two or more of the small and medium power laser cutting machine. This will help the factory to save some cost and improve profits.

5)The core part of the laser cutter.

Laser generator and laser head:

Most of the laser generator adopt imported IPG brand while the economical type is Raycus brand from China.

Besides, special attention also should be paid to other components such as the electrical motor (whether is servo motor), linear guide, frame etc because these components will also generate some influence on the cutting accuracy.

One particular thing to note is the cooling system of the laser cutting machine – the cooling cabinet. Many companies use home use air conditioners to cool them directly, and the effect is clear, very bad. The best way is to use the industrial special use air conditioner to achieve the best effect.

6) Repair and charges

Any equipment will be damaged in different degrees during use. In the case of repair after damage, it is a matter of consideration whether the maintenance is timely and charged less.
Therefore, it is necessary to understand the after-sales service of the enterprise through various channels, such as whether the maintenance fee is reasonable.

 

How to DIY Laser Cutter?

If you really need it, it’s the easiest thing to buy one.

DIY is hard, and you don’t save money.

There were laser cutter enthusiasts who DIY one metal laser cutter, the software, circuit and machinery are all designed by himself.

It took about three months.

Of course, if you want to practice, making a machine from start to finish can be very rewarding.

Check below DIY laser cutter:

How to DIY Laser Cutter

Laser Cutter Kit

Laser Cutter Wearing Parts List
No. Item
1 Protective Lens
2 Filter Element
3 Copper Nozzle
4 Focus Lens
5 Ceramic Ring
6 Collimating Lens
7 Amplifier
8 Amplifier Connector

Operation Cost Analysis of Laser Cutter.

Operation Cost Analysis of Laser Cutter

1) Take 1mm stainless steel as an example to calculate capital used and time-cost

For example:

Cut 1mm stainless steel, total 50000 meters, roughly time period ( since the short hole drilling time for thin sheet metal and unable to record empty stroke, each enterprise has different production arrangement, therefore, the statistical results will not be impacted too much due to the horizontal comparison of efficiency and costs. The loading and unloading time is not counted)

  • Fiber laser cutter 2000W

50000m÷20m/min÷60min=41.7h≈5 day

41.7h×(27.8RMB+70RMB)≈4078RMB

  • CO2 laser cutter 3000W

50000 m÷8 m / min÷60 min =104.2 h≈13 day

104.2h×(63.5RMB+70RMB)≈13911 RMB

  • CO2 laser cutter 2000W

50000 m÷6.5 m / min÷60 min =128.2 h≈16 day

128.2h×(50.5RMB+70RMB)≈15488 RMB

1mm SS Fiber laser 2000W CO2 laser 3000W CO2 laser 2000W
Time(day) 5 13 16
Cost(RMB) 4078 13911 15488

2) Take 2mm stainless steel as an example to calculate capital used and time-cost

For example:

Cut 2mm stainless steel, total 50000 meters, roughly time period

  • Fiber laser cutter 2000W

50000m÷8.5m/min÷60 min =98h≈12 day

98h×(27.8RMB+70 RMB)≈9588RMB

  • CO2 laser cutter 3000W

50000m÷4.5m/ min÷60 min =185.2h≈23 day

185.2h×(63.5 RMB +70 RMB)≈24724 RMB

  • CO2 laser cutter 2000W

50000m÷3m/ min÷60 min =277.8h≈34.7 day

277.8h×(50.5 RMB +70 RMB)≈33475 RMB

2mm SS Fiber laser 2000W CO2 laser 3000W CO2 laser 2000W
Time(day) 12 23 34.7
Cost(RMB) 9588 24724 33475

3) Operation cost analysis table.

Cost(RMB) IPG 2000W CO2 2000W CO2 3000W
Laser generator(KW) 6.1 19.6 26.1
Water chiller(KW) 5.6 7 10.5
Auxiliary(KW) 5.6 5.6 5.6
Laser cutter(KW) 8.4 8.4 8.4
Gas(N2+H2+CO2) 0 7 10
Focus lens 0.74 1 1
Ceramic body 0.8 0.8 0.8
Cutting nozzle 0.2 0.2 0.2
Reflecting lens 0 0.9 0.9
Protection lens 0.4 0 0
Operation Total(RMB) 27.8 50.5 63.5
Oxygen (1~20mm mild steel)12~18RMB/h
Nitrogen (1~8mm stainless steel)50~150 RMB /h

4) Operation efficiency(take 1~4mm thickness as example)

Item Thickness(mm) IPG2000 CO2 2000W CO2 3000W
Cutting speed(m/min)
Mild steel 1 10.0-13.0 5.0–6.5 6.0–9.0
2 5.0-6.0 3.5–5.0 4.0–5.6
3 3.0-4.8 3.0–3.8 3.0–4.6
4 2.8-3.5 2.5–3.3 2.6–3.8
5 2.2-3.0 2.2–2.8 2.2–3.2
6 1.8-2.5 1.8–2.5 2.0–2.8
8 1.2-1.8 1.1–1.6 1.3–2.0
10 1.1-1.3 1.0–1.3 1.2–1.6
12 0.9-1.2 0.9–1.1 1.0–1.4
SS 1 15.0-22.0 6.0-9.0 7.0–9.0
2 7.0-9.0 3.8-4.5 4.2–5.2
3 3.5-5.5 2.0-2.5 2.8–3.9
4 3.0-4.5 1.2-1.8 2.0–2.8
5 1.8-2.5 1.0-1.3 1.6–2.0
6 1.2-1.8 0.6-0.9 1.3–1.6
8 0.8-1.0 0.7–1.0

Laser Cutting Machine Maintenance & Troubleshooting

Summary

In order to ensure the normal use of a laser cutting machine, the equipment must have routine maintenance.

As the laser cutting machine using high-precision components, must be careful in the routine maintenance process, in strict accordance with the operating procedures, and arrange the specific person to do the maintenance, cannot operate brutally, so as not to damage the components.

The user should always prepare the following spare parts:

A) Acetone: 99.5% purity, less than 0.3% water, 500ml capacity.
B) Absorbent cotton: 5 packs. (Medical grade or optical grade)
C) Alcohol: 500ml, purity 99.5%+.
D) Dropper: one (medical).
E) Cotton swab: two packs.
F) Multimeter: one.

 

The method of installing or replacing the internal lens of the cutting head

Laser Cutting Head

1) Before installing the optical lens, pay attention to: wear clean clothes, clean hands with soap or detergent, and wear light and clean white gloves; do not touch any parts of the hand contact lens; take the lens from the side, do not touch directly to the lens coating surface.

2) When assembling the lens, do not use the mouth to blow against the lens; the lens should be placed on the clean desktop and put a few lenses professional paper under it.

Take the lens should be careful to prevent bruises and falls, and are not allowed to exert any force on the lens coating surface; the lens holder to install lens should be cleaned, with a clean air spray gun to clean the dust and dirt in the lens holder, then, put the lens gently into the lens holder.

3) When installing the lens in the lens holder, do not use too much force to fix the lens to avoid the deformation of the lens, thus affecting the quality of the beam.

4) Precautions when replacing the optical lens:

  • Take care of the lens when removing the lens from the box in case of scratching.
  • Do not apply any pressure to the lens until the wrapping paper is not opened.
  • When removing the protective lens and focusing lens from the box, wear clean gloves, remove from the side of the lens;
  • Remove the packaging paper on the lens should avoid dust and other objects fall on the lens;
  • Remove the lens, with a gun to remove the dust on the mirror, and then put the lens on the optical lens paper;
  • Remove the dust and dirt on the lens holder and the supports, should avoid the other foreign body fell on the lens when assembling;
  • Install the lens in the lens holder, do not use too much force so as not to deform lens;
  • After the lens assembly is complete, use a clean air gun to remove the dust and foreign matter on the lens again.

Steps to clean the lens of the laser cutting machine:

  1. First blow out the dust on the mirror with a spray gun; then to remove dirt with clean cotton swab; use cotton swab with a new high-purity alcohol or acetone do circular motion from the center of the lens along the, scrub the lens, exchange another clean cotton swab after one round circle, repeat the above operation until the lens is clean;
  2. Use a clean cloth to clean the lens, remove the residual marks on the mirror, be careful not to scratch the mirror; clean the lens to get plenty of light to observe, if the lens reflection is good, that the lens has been cleaned, if the reflection of the lens is not good, you have to continue to clean the lens;, place the cleaned lens in the mirror base in accordance with the above method. Prohibit the use of the used cotton swab to operate.

Storage of optical lenses

1) Proper storage of optical lens can keep the quality of the lens.

2) Storage environment temperature 10 ~ 30 ℃, the lens cannot be placed in the freezer or similar environment, or it will be condensed when removing out, very easy to damage the lens; storage environment temperature cannot be greater than 30 ℃, otherwise, it will affect the lens surface coating.

3) The lens stored in the box, the lens should be placed in a non-vibrating environment, or likely to cause deformation of the lens, thus affecting the performance of the lens.

Electrical inspection

Mainly to check the stability of the daily supply voltage, to keep the machine electrical cabinet clean,  well ventilated. Check the integrity and safety of each part of the line.

Maintenance cycle

A) The maintenance cycle of the laser, chiller and air compressor should according to the maintenance cycle specified in the instruction manual.

B) the first time machine maintenance should after the first 24 hours use, 100 hours later do the maintenance again, six months later do another overhaul, until then do the maintenance every six months or one year (depending on customer specific circumstances).

Maintenance during operation

Before running the machine, please overhaul the laser cutting machine according to the daily inspection list. If an abnormal sound occurs during machine operation, please stop it immediately and check. After finishing using the laser cutting machine, please stop according to the order, and clean-up the machine table and the site around the machine, do not place irrelevant items on the machine table or control panel.

  • Regularly check the machine to focus on the oil level of the lubrication pump (found inadequate, timely filling the oil), and the appropriate extension of the manual refueling time, to ensure that the X-axis guide, Y-axis guide full filling of lubricants to ensure the accuracy of the machine and the lubrication of the moving parts to extend the X, Y-axis guide life;
  • The Z-axis linear guide and the dust on the screw shaft must be cleaned once a week and add the engine oil
  • Check whether the water, air pipe damaged once a week, if damaged, should promptly notify our company staff for maintenance;
  • Clean the air every week to filter the debris dust;
  • Check the internal cooling water level of the water cooler every week, if not enough please add in time.
  • Check the contamination of the focusing lens every half month, and clean the optical lens in time to ensure its service life.
  • Check the protective mirror once a day to protect the cutting effect of the lens;
  • Check the gas path once a month to remove the hidden danger;
  • Regularly check whether the external cable has been damaged, check the distribution cabinet line interface with or without loosening;
  • After the laser cutting machine is installed, the levelness of the machine should be adjusted after six months of use to ensure the cutting accuracy of the machine;

Maintenance for long-term not use

When the machine is not used for long periods of time, please apply butter to the moving parts of the machine tool, wrap the anti-embroidered paper, and check the rusty parts regularly, do rust removal and anti-rust treatment for the rusted parts. (add dust cover if have enough budget), to clean and check the machine regularly.

Laser Cutting Machine Troubleshooting

Problems Causes Solutions
Parts are processed without auxiliary gas output 1. lack of pressure; 1. check the air pressure;
2. the solenoid valve or wireline is broken; 2. check the solenoid valve or solenoid valve line
There is an abnormal sound in the movement of the axis 1. no lubricants on the moving parts; 1. add lubricants;
2. check the movement path is safe 2. check the moving parts path safety
There is no laser at the cutting head. or the light is weak 1. no light signal; 1. check the PWM signal line;
2. laser or fiber is broken; 2. check whether the laser alarm;
3. nozzle block; optical path partial; 3. replace the nozzle; 4. adjust the optical path
The cutting pattern does not match the size of the drawing 1. the program errors; 1. read the instructions. check the operation is correct;
2. the positioning accuracy has been affected; 2. check the accuracy of the machine is qualified;
3. the servo is damaged; 3. replace or repair the servo system

 

Best Laser Cutter Companies in the World

The world’s leading companies including:

Germany Trumpf, Italy Prima, Switzerland Bystronic, Japan Amada, MAZAK, NTC, Australia HGLaserLab etc.

Nothing is the best, only better, you should choose the one which is more suitable for you.

Laser cutting belongs to a mature manufacturing process. The performance of the laser cutting machine of the first-class brand is not much different, and it is mature from brand to quality and service.

The choice of a suitable laser cutting machine is usually dependent on the production materials. The following questions need to be considered:

  1. Cutting seam

The slit of laser cutting is usually 0.10-0.20mm;

  1. Smooth cutting surface

There is no burr on the cutting surface.

  1. Small heat deformation

The laser featured thin cutting seam, fast speed and concentrated energy, so it can be transferred to the cutting material with little heat and the deformation of the material is very small.

  1. Suitable for large product processing.

Large products’ mold manufacturing cost is very high, laser processing does not need any mold, and laser processing completely avoid the collapsed edge of materials formed if adopt punching and shearing, which can greatly reduce the production cost of enterprises to improve the grade of the product;

  1. It is suitable for the development of new products and shortens the development cycle.

Once the product drawing is formed, laser processing can be done immediately, and you can get the new product in the shortest time.

  1. Save material

Laser processing uses computer programming, can make the product of different shape to be cut, which will maximize material utilization rate.

Laser Cutting Machine Operation

Before using this laser cutting machine, please grasp the machine-related operation method and understand the operation of the various parts of the machine, the correct operation is the effective measures to ensure the normal work of the laser cutting machine and personal safety. When using the laser cutting machine, follow the following precautions and inspections before use.

Preparation and inspection before use the laser cutter

A) Check whether the machine oil level is in the normal range, otherwise add the oil to the normal range.

B) Check the relevant water, gas channel, to ensure that the air and water flow do not leak, and the quality of gas and cooling water is normal, not contaminated.

C) Check the coaxially of the laser and the gas nozzle to ensure that the laser beam is ejected from the center of the gas nozzle.

D) Check whether the mouth is in accordance with the cutting process requirements, otherwise, replace the appropriate cutting gas nozzle.

E) Check whether the auxiliary gas for cutting is properly connected, otherwise access the auxiliary gas for cutting and ensure that the gas pressure has been adjusted to the appropriate level.

Safety precautions and safety signs before use and in use

Laser cutting machine usage and operation

Represents “Attention”, does not follow the correct operation could result in personal injury or damage to the equipment

Laser cutting machine usage and operation

Represents there is a laser beam through, do not pass from the beam, otherwise, it will cause burns on the human body or even life-threatening

Laser cutting machine usage and operation

Represents there is a high-voltage power supply danger, do not close to high pressure, otherwise, it will cause electric shock or even life-threatening

Precautions:

A) No person shall, at any time, refrain from placing the eye in the direction of the laser (including the red light).

B) When opening the shutter, prohibit people and non-work items in the laser irradiation range.

C) The operator should wear protective glasses, the operator is prohibited to leave during the operation of the laser cutting machine.

D) If an abnormality occurs during machine use, press the emergency stop switch immediately or turn off the main power supply.

E) During use, the cooling water temperature and working gas pressure should always be checked.

F) Operate the equipment with the operating license, comply with safe operating procedures, non-machine tool staff is strictly prohibited operation.

G) The laser-equipped on the laser cutting machine is 4 level laser products, the laser is invisible light, the shot beam, lens reflection and diffuse light may cause damage to the human body (especially the eye), the personnel at the site should pay attention to protection, and to prevent fire occurrence.

H) Exhaust gas generated during laser cutting has greater damage to the operator, make sure that the machine’s vacuum cleaner is working properly.

I) Keep the laser cutting equipment clean and tidy, refueling according to the provisions to ensure reasonable lubrication; to comply with the shift system, manage the tools and accessories well, do not lost; stop the machine for checking immediately when find malfunction, if cannot be handled by the operator, should timely notice related engineers to give it a thorough overhaul.

J) To prevent electric shock damage, non-professional maintenance personnel is strictly prohibited inspection, maintenance of the electrical control part of the laser cutting machine.

Switch on/off sequence

A) Turn on the external mains power supply so that the dynamic electricity is connected to the control cabinet

B) Make sure that the water cooler switch is open (do not close the water cooler switch after use)

C) Check if the emergency stop switch is released

D) Turn on the key switch to the “on” position

E) Turn on the computer.

F) To the left turn on the laser power

At this point, the laser cutting machine is turned on, shut down in the opposite order.

Software use and programming

The use of the software please checking the software manually, here we do not discuss in detail.

Automatic calibration instructions for height sensor

When you need to calibrate when exchange the nozzle or the servo distance is not accurate, calibration is a way to correct the height of the follower, the method is as follows:

A) Move the cutting head down to about 5mm from the surface of the plate

B) Select calibration on the height control torch → floating head calibration → confirmation

C) At this point, the cutting head will drop twice, check the plate position, the whole process needs about 10S

D) At the end of the calibration, the calibration curve is displayed on the height control torch. The normal curve is smooth. If the calibration result is poor, the cutting effect will be affected and need to be re-calibrated.

In summary, there are many factors that affect the calibration results, in general, the factors including:
1. board surface is unstable.
2. Z-axis slide with shaking.
3. external electrical interference is too serious.

Calibration results including four: A, B, C, D, the laser cutter can be used as normal when the calibration is above class “C”, re-calibration is required to eliminate the interference when the result is “D”.

Laser Cutting Machine Safety

Safety management of laser cutting machine

This post mainly focuses on laser safety notice, electrical safety, laser cutting machine protective measures, common knowledge should be known by the operators. Safety is important for every operator. This is about life safety.

Precautions

A) Designate safety administrators to determine their terms of reference and conduct safety operation and safety education for laser processing operators.

B) Specify the laser safety management area, in the management area of the entrance to set up a warning card, including laser processing machine power, laser type, prohibit outsiders to enter, pay attention to protect the eyes and safety manager name.

C) The operator of the laser processing machine must be specially trained to a certain level, and to induct operation under the premise of the safety administrator’s agree.

Laser safety notice

Laser mainly harm the eyes and skin of the human body. , laser irradiation can cause burns to any part of the body. Should avoid any part of the body placed in the light path of the laser equipment, so as not to cause damage caused by misuse.

Eye and skin protection

In laser processing, usually using CO2, YAG lasers, different types of lasers can cause different harm to the human body. YAG laser may damage the retina of the eye because the YAG laser wavelength has very high transmittance to human’s eyes, so are more harmful. CO2 laser damage is mainly burned on the cornea of the eye. Both laser exposure may cause eye cataracts and the risk of burns to the skin. Therefore, in the adjustment of the laser, using the appropriate protective measures according to the different types of laser.

Fire prevention

Laser cutting often uses oxygen, coupled with the sparks splash when cutting, oxygen easily leads to the risk of fire. Therefore, the work area should not exist flammable and explosive materials and have the appropriate preventive facilities.

Electrical Safety

A) Do not touch any switch with wet hands to avoid electric shock. The area of the laser cutting machine equipped with lighting signs means these parts have high electrical voltage or electrical components, the operator close to these parts or open maintenance should be careful to avoid electric shock. Such as the protective cover at servo motor’s position, the junction box behind the column, laser cutting machine’s transformer cabinet, electrical cabinet doors, etc.

B) Read the machine manual and electrical schematic in a comprehensive manner so that you can familiarize yourself with the functions and functions of the corresponding keys.

C) Do not open the electrical door easily, prohibit unauthorized changes to the set machine parameters, servo parameters and the potentiometer (with the exchange table matching). If you need to change, you must be trained by the equipment manufacturer and approved by the professional staff. Record the parameter values before the change so that the original state can be restored if necessary.

D) The general power supply voltage of processing laser cutter is several thousand volts to tens of thousands of volts, should prevent the laser high voltage and X-ray generated by the electron tube under high voltage.

E) Do not touch the live parts of the electrical cabinet in the energized state, such as numerical control device, servo device, transformer, fan and so on.

Alert:

After the power failure, you must wait for more than 5 minutes and then touch the terminal. Because after the power failure in a period of time, there is a high voltage between the power line terminal. To avoid electric shock please do not touch immediately!!

Laser cutting machines protective measures

Designate a safety administrator, determine its terms of reference, and conduct the safe operation and safety education for laser processing operators.

Specify the laser safety management area, in the management area of the entrance to set up a warning card, including laser processing machine power, laser type, prohibit outsiders to enter, pay attention to protect the eyes and safety manager name.

When the laser processing machine not in use, should pull out the key switch, by hand custody, so as to avoid harm caused by misuse.

Smoke and gas and laser working gas produced in the process of fabricating should be discharged outdoor through the exhaust pipe, all cylinders should be placed neatly, solid.

Common knowledge should be known by the operators

Laser cutting machine operators must be specially trained to reach a certain level and to induct operation under the security administrator’s agreed.

The operator of the laser cutting machine or the person close to the laser during the use of laser cutter, should wear appropriate laser goggles and wear protective clothing, in the area of wearing protective goggles, must have good indoor lighting to ensure the smooth operation of the operator.

In order to protect the operator, must have a processing room or protective screen. There should be safety devices to prevent the diffuser of the laser and protect the safety of the operators. When the door of the processing room opened, should close the laser shutter.

Laser Cutting Thickness & Speed Chart

The following laser cutting thickness chart might be helpful for you. You can also download the xls file of laser cutting thickness chart on this page.

Laser Cutting Thickness and Speed Chart Laser Cutting Thickness and Speed Chart

How We Can Support You

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