A hydraulic shearing machine is a kind of machine that uses a moving upper blade and fixed lower blade to apply a shear force to metal plates of various thicknesses by using reasonable blade clearance, so as to break and separate the plates according to the required size.
Shearing machines are a kind of forging machinery, and the main function is metal processing.
The machines are widely used in aviation, light industry, metallurgy, chemical industry, construction, shipbuilding, automobile, electric power, electrical appliances, decoration and other industries to provide special machinery and complete sets of equipment.
The following video will show you how it works.
What is Hydraulic Shearing Machine?
The hold-down cylinder of the hydraulic shearing machine is driven by the hydraulic system to press the steel plate, and the left and right oil cylinder drive the blade up and down movement.
The upper blade on the blade carrier and the lower blade fixed on the blade holders adopt reasonable blade clearance.
Shear force is applied to the metal sheet of various thicknesses and separates the sheet according to the size of the required fracture.
The hydraulic shearing machine is widely used in all kinds of metal materials, to meet the various demand for direct shearing.
It is mainly applied in steel manufacturing, shipbuilding, automobile, container manufacturing, switch electrical appliances, machinery manufacturing, light industry, etc.
Working Principle of Hydraulic Shearing Machine
As we put at the beginning of the post, the sheet metal shearing is realized by upper and lower blade movement driven by the hydraulic system.
Different Types of Hydraulic Shearing Machine
The plate shearing machine can be divided into two categories: hydraulic shears and mechanical shears.
Due to the large energy consumption and excessive noise of mechanical shears, hydraulic shearing machines are much more widely been used.
According to the blade carrier movement, the hydraulic shearing machine can be divided into:
- Hydraulic swing beam shears
- Hydraulic guillotine shears
The following is the various types of shearing machine:
- Guillotine shear， plate shear
One blade on the shearing machine does the reciprocating linear motion relative to the other blade to realize sheet metal cutting purposes.
- Hand guillotine shear, hand plate shear
- Hydraulic guillotine shear, hydraulic plate shear
- Pivot blade shear, swing beam shear
The upper blade carrier of the shears is swung around the pivot.
- Hydraulic pivot blade shear, hydraulic swing beam shear
A hydraulic-driven swing beam shears.
- Multi-strip slitter, coil slitting shear
Using multiple disc scissors to cut the coil into multiple strips with the required width.
- Multiband slitter, sheet slitting shear
Using multiple disc scissors to cut the metal plate into multiple strips with the required width.
- Nibbling machine
The plate is processed into any shape by step.
- Circular shear, rotary shear
The shearing machine with a pair of rotary blades to cut plates in a straight line or curved line.
- Universal ironworker for punch, bar and section shear
A machine with two functions including punching and cutting.
- Universal ironworker for plate and section shear
A machine with two functions including metal plate punching and cutting.
- Universal ironworker for punch, plate, bar and section shear
A machine with three functions including plate punch, plate shearing and section shearing.
- Universal ironworker for punch, plate, bar and section shear, notching
A machine with four functions including plate punch, plate shearing, section shearing and notching.
- Billet shear, section steel shear
Special shearing machine for steel section.
- Bar shear
Special shearing machine for bar material.
- Alligator shear
The upper blade of the alligator shear is in a scissor motion.
- Reinforcing bar shear
Special shearing machine for reinforcing bar.
- Precision bar shear
Special shearing machine for the precise shearing bar.
- Slab shear
Special shearing machine for the slab.
- Scrap shear
Special shearing machine for scrap steel.
- Ingot shear
Special shearing machine for billet.
Advantages of Hydraulic Shearing Machine
Compared with the old-fashioned plate shears, hydraulic plate shears have a great advantage in that they are controlled by a series of codes during actual operation.
There are many kinds of these codes.
They are mainly produced through various permutations and combinations of characters.
It depends on the application required to formulate the code in the specific work.
One of the great advantages of using this way to control the work of the hydraulic shearing machine is that it can more accurately control the orientation, speed and strength of the machine.
The concept of numerical control is to use computer programming to realize machine operation through the combination of numbers.
In the direction of positioning, the hydraulic shearing machine has very obvious advantages.
When the machine rotates, the adjusting rod can rotate around without a dead angle along the central axis, and the machine has no great noise, which can enable the operators to work in a quiet environment without affecting people’s working mood and health.
The production material is very strong stainless steel, which has good corrosion resistance and strength and can maintain a high degree of stability in the environment with large vibration amplitude.
The operation method is simpler and easy to learn. It needs computer-based talents to operate it.
Moreover, this machine not only has strong practicability but also has a good-looking appearance.
Great progress has also been made in safety protection.
The hydraulic shearing machine is equipped with a strong self-defense fence.
Once the machine fails, there will be a fence to separate the operator from the machine.
The adjustment of light also improves the speed greatly.
It can quickly move the light and find the correct position so that people can see the specific working situation more clearly, which will bring more convenience to the production process and machine operation.
Parts and Function of Hydraulic Shearing Machine
1. Shearing machine frame
The frame is welded with steel plate, which includes the left, and right board, worktable, clamp holder, and fuel tank.
A hydraulic cylinder and sliding block guide support are installed on both sides of the rack, which is a pushup mechanism that can control the clearance of blades.
The hydraulic hold-down cylinder on the clamping device can tightly press the plate for shearing.
2. Blade holder
Fixed upper blade, connect with the hydraulic cylinder, do up and down straight movement, pass shear force, and achieve the cutting purpose.
In addition, the backgauge mechanism is also fixed on the blade holder to realize the positioning of the shear plate size.
3. Shear blade
The upper and lower shear blades are made of high-standard steel and can be suitable for shearing steel from low carbon steel to stainless steel sheet, upper and lower blade has four interchangeable cutting knife, improving the service life of the blade.
4. Backgauge mechanism
Fixed on the blade holder, including the backgauge regulating motor, micro dynamic adjustment mechanism, backgauge lifting mechanism, digital display device, transmission screw, guide bar, etc.
The movement of the shearing machine backgauge is driven by the motor, and driven the running of backgauge stopper plate to realize cut-to-length cutting.
5. Fuel tank
The fuel tank is installed on the oil tank base behind the shearing machine, the left side of the tank is the hydraulic integrated valve block, hydraulic oil pump and main motor.
The left side of the tank is equipped with an oil gauge and the hydraulic oil added to the middle level of the gauge is ok.
6. Clearance adjustment device
The best shear force can be achieved according to the gap between the upper and lower blades of the shear material and the plate thickness, which can protect the life of the blade and guarantee product quality.
Rule of adjustment: generally adjust the gap of 10% of the thickness of the cut material.
7. The front supporter
There is also a side retaining device attached to the work table, which is designed to ensure that the shear plate is perpendicular to both sides.
8. Finger protection plate
The finger protection plate of the shearing machine is installed on the machine clamp holder, which is mainly used to control the safe distance of the fingers.
In order to ensure the safe distance of the finger, the position of the finger protection plate must meet the mechanical safety standard.
Safe distance for fingers protection
Note: The above dimensions are in accordance with mechanical safety standards.
- When placing the plate in the backstop block, the finger should not be placed between the plate and the shearing machine table, in case the plate is pressed against the finger during the pressing process.
- When the backgauge block is not in position, the plate should not be pushed through the finger protection plate to avoid scratching the finger.
9. Holddown cylinder
In order to prevent the moving of the plate during the cutting process, the hold-down cylinder is adopted to press the plate firmly.
10. The electric system of the shearing machine
The function of the electric system mainly includes starting the oil pump motor driving the oil pump to provide the driving force for hydraulic shears, supply control power;
The control circuit is mainly connecting the solenoid valve and oil pressure based on operation instructions to drive the knife carrier up and down movement to achieve the shearing purpose.
At the same time, the electricity controls the stroke of the blade, and the back-and-forth movement, to lighten the alignment line, increase and reduce the gap, and adjust the shear angle.
11. The hydraulic system of the shearing machine
It consists of the main oil pump, hydraulic system, hydraulic cylinder, pressure cylinder, hydraulic pipe, etc.
Hydraulic oil pump provides shearing pressure for hydraulic equipment.
The hydraulic system mainly controls the system pressure and hydraulic oil direction.
The hydraulic cylinder is used to drive blade holder movement to achieve plate shearing function.
The hold-down cylinder is mainly pressing the workpiece to ensure precision of the workpiece.
Specifications of Hydraulic Shearing Machine
1. Shear thickness
The shear thickness of the hydraulic shearing machine is mainly limited by the strength of the plate shear mechanism and finally depends on the shear force.
There are many factors affecting the shear force, such as edge clearance, edge sharpness, shear angle (plate width for flat knife shear), shear speed, shear temperature, the width of the shear surface, etc., and the most important is the strength of the sheared material.
At present, the shearing thickness of the hydraulic shearing machine is mostly less than 32mm, which is too large.
If the thickness is too large, it is not desirable from the perspective of equipment utilization and economy.
2. Shear sheet width
The width of the sheared sheet metal refers to the maximum size of the sheet metal cut at one time along the direction of the shears of the plate shears.
It is formulated with reference to the width of the steel plate and the requirements of the manufacturer (the width of the shearable plate is less than the length of the cutting edge).
This cutting method is called the cross-cutting method.
The slitting mode is multiple contact shear.
As long as the strip width is less than one throat of the notch of the plate shear, the shear size is not limited.
With the development of science and technology, the plate cutting width is increasing.
At present, the hydraulic shearing machine with a plate cutting width of 6000 mm has been more common, and the maximum plate width of foreign plate cutting machines has reached 10000 mm.
3. Shear angle
In order to reduce the bending and distortion of the sheared sheet metal, a smaller shear angle is generally adopted, so the shear force may increase, which will also have some impact on the strength and stiffness of the stressed parts of the shears, but improve the shear quality.
4. Throat depth
The longitudinal cutting method has certain requirements for the throat depth of the plate shear.
At present, the plate shear tends to have a smaller throat depth, which can improve the stiffness of the frame, but reduce the quality of the whole machine.
Applications of Hydraulic Shearing Machine
Hydraulic shearing machines are widely used in the fields of decoration, electrical appliances, electric power, automobiles, ships, aerospace and so on.
In the field of decoration, hydraulic shearing machines are widely used.
They are generally used with bending machines to complete the production of stainless steel doors and windows and the decoration of some special places.
In the field of electrical and electric power, the hydraulic shearing machine can cut the plates into different required sizes, and then process them again through the bending machine, such as the electrical cabinet, refrigerator and air conditioning shell.
In the field of automobiles and ships, slightly large hydraulic shearing machines are generally used, mainly to complete the plate shearing work, and then in the secondary processing, such as welding, bending, etc.
In the aerospace field, accuracy is generally required to be high.
CNC hydraulic shearing machines and electro-hydraulic synchronous CNC bending machines can be selected, which are accurate and efficient.
Hydraulic shearing machine and bending machine are more or less applied in some other fields, and it plays an important role in related fields.
How to Use Hydraulic Shearing Machine
- clean the oil on the surface of each shearing machine component, and notice that the ball valve should be in the open position;
- lubricate the lubricating parts;
- add N32-N46 thickened hydraulic oil to the tank (the oil must be filtered);
- machine grounding, switching on the power supply, checking the coordination of each electrical activity;
- before starting, especially if the accumulator needs to be re-inflated, it must check the position of the ball head.
Steps to use the hydraulic shearing machine
- Start the machine to run a certain number of cycles, and make sure that various thickness of the plate is cut (from thin to thick) under normal conditions for testing purpose.
- Open the pressure gauge switch when cutting, and observe the oil pressure value, if there is abnormal, adjust the overflow valve to make it meet the requirements;
- Adjust blade clearance to a suitable position according to the plate thickness
- Transfer the plate to the work table;
- Adjust the backgauge to the proper position according to the size of the cutting sheet
- Push the plate to make the plate contact with the backgauge plate, and set the shear size;
- Step down the foot switch to shear the steel plate;
- Repeat (4)- (6) to cut off the next sheet;
- After cutting a piece of steel plate, replace it with a duplicate (4)-(8) processing;
- Turn off the power when the work is finished, and carry out daily maintenance of the equipment (according to the daily maintenance of the shearing equipment);
Safe Operation Rule of Hydraulic Shearing Machine
- The operator must be familiar with the general structure and performance of the shearing equipment.
- The operator must master the use and maintenance standards of the shearing equipment.
- Lubricate the shearing machine according to lubrication provisions, check the oil quantity, and oil quality, and cover the oil cup.
- Aligning cutting blade before the operation. The blade clearance shall be determined according to the thickness of the shear plate, generally between 5 ~ 7% of the thickness of the cutting sheet. Each clearance adjustment applies the hand to rotate the flywheel to make the upper and lower blade reciprocate once, and check the clearance with the feeler gauge.
- According to the requirement of the shearing workpiece, loosen the anchor bolt, adjust the position of the retaining plate, and strengthen it. The shearing machine should be run 2 ~ 3 times before work, to make sure the lubrication is good, and the operation can be done without exception.
- It is forbidden to use the percussion method to loosen the backgauge device or adjust the clearance of the blade. When adjusting the clearance of guide rail and blade clearance, the shearing machine should be stopped before carrying out the adjustment. It is forbidden to hand in the cut area or to pick up or catch the materials during the operation.
- The blade must be sharp and should be sharpened or replaced in time for damage or wear or delay.
- When cutting the plate with different thicknesses and materials, the pressure of the clamp spring and blade clearance should be adjusted properly, to prevent spring breakage or damage the blade edge.
- It is forbidden to cut steel bar with the hydraulic shearing machine, Other items must not be placed on the workbench so as not to get into the blade and damage it.
- It is prohibited for the operator to leave or to hold the equipment operation under others’ watch.
- Pay close attention to the clamping mechanism and clutch and brake for abnormal failure; during shearing, the operator should be concentrated, if detection abnormal phenomenon of the shearing machine, the operator should stop the shears immediately, cut off the power, and inform the concerned personnel to repair.
- Before leaving work, should cut off the power, wipe off the equipment, and make a check record.
- It is forbidden to cut excessively long and thick plate, not to shear high-speed steel, tool steel and cast iron.
- The clutch should be off before starting, and the motor should not start with the load.
- Before starting, test the empty cutting, after everything works well, then start the cutting operation.
- It is forbidden to cut explosive articles, rods, overthin workpieces and non-metal materials.
- Notice whether the pull rod fails, or whether the fastening screw is strong. The finger cannot enter the blade mouth when feeding. It is strictly forbidden to cut two workpieces by two operators at the same time. No standees behind the shearing machine.
Matters Needing Attention for Hydraulic Shearing Machine Operation
（1）Check the gap between the blade frequently and adjust the gap according to the thickness of different materials;
（2）The blade must be kept sharp, and the cut surface is not allowed to have a scar, gas cut seam and protruding burr;
（3）When adjusting the machine, it must be stopped to avoid personal and machine accidents;
（4）If found abnormal noise or oil tank overheating phenomenon during operation, should immediately stop the shearing machine to check, the highest temperature of the oil tank cannot exceed 60 ℃;
（5）Do not cut strips to avoid damage to the machine. The cutting size of the most narrow sheet shall not be less than 40mm;
（6）Note: the shearing thickness of the plate shears refers to the material of the Q235 steel plate (shear strength 450 Mpa), the thickness of the plate tensile strength increases, and the maximum cutting thickness decreases.
For the hydraulic shearing machine with the maximum cutting thickness of 16 mm, the shearing thickness of the Q345 plate is 13 mm, while for the 8 mm cutting capability of the Q235 steel plate, for the Q345 plate thickness is 6 mm.
Blade of Hydraulic Shearing Machine
Shearing machine blade material
Standard blade hardness
These blades can cut ordinary cold rolling plates and most stainless steel plates.
When cutting mass stainless steel or hard materials, the raw edges may be generated when cutting.
In this case, we can provide the optional blade for 6.5/10mm shears, hardness HRC 56/57.
You can also check out the detailed 8 Commonly Used Materials of Hydraulic Shears Blade
Shearing machine blade angle adjustment
Blade angle and clearance calculation depend on the standard material.
The gas cabinet has a diagram to adjust the data at any time to get better shear results.
For example, sometimes increasing the “tilt angle” reduces the cutting edge.
But it may be deformed when cutting the strip.
Sometimes reducing the “tilt angle” can reduce the deformation, but may produce burrs.
Minimum cutting width of hydraulic shearing machine
The width of the shearing strip should not be less than three times the thickness of the plate without requiring precise shearing.
In the precision shear, the width of the shear material should not be less than 6 times the thickness of the plate in case of distortion or bending.
The greater the width of the shear material, the smaller the deformation.
Shearing accuracy of hydraulic cutting machine
When inspecting the shear quality, the data of the shear 2mm ordinary cold rolling plate are as follows:
- When setting X = 100mm, the parallelism allowance of the specimen is 0.15mm in any 1000mm length.
- When setting X = 100mm, the straightness of the specimen is 0.25mm in any 1000mm length.
- The repeat positioning accuracy of the X-axis is 0.02 mm.
- The length of the specimen can be plate shearing width.
- Specimen tensile strength σb≤450 Mpa.
Shearing machine blade assembly
Upper blade installation:
First mount the blade, bolt the M1240 screw on the upper blade, and temporarily not bolt the screw at the two ends.
Resist the upper blade with a stick, and tighten the installed M1240 screw in turn when the surface of the upper blade is fully pressed with the contact surface of the slider.
Drop down the slider, turn off the pump motor, and install the M12*40 screw on both ends of the blade, tightening the screw.
The tightening torque of the blade screw is 35N/M.
Lower blade installation:
Start the oil pump first and make the slider rise to the dead point, when the oil pump is turned off, load the blade and twist the hexagon screw of M1245 (Don’t twist it too tightly for the time being).
Press the blade with a stick to make the blade close to the bottom of the work table, and screw the M1245 screw in turn according to the requirement.
Adjustment of blade clearance
The blade clearance directly influences the quality of the shear surface and the life of the blade.
1. Too small blade clearance
Generally, the standard clearance between the upper and lower blade is 0.02mm, which is equivalent to the thickness of a normal A4 paper.
In the installation process, using the shearing machine to cut paper is the most commonly used method for adjusting blade clearance.
If the blade clearance has been adjusted to small:
- The cutting edge of the blade is under too much force, which will damage the cutting edge directly and make the cutting edge not sharp.
- Affected by other factors, the dislocation of the upper and lower blade leads to the upper blade cutting the lower blade, which causes the cutting edge of the blade to crack. This situation very easy to hurts the operators.
2. Too big blade clearance
This is also a mistake that non-professionals make when installing blades.
In order to prevent the blade of the shearing machine to hit each other, they simply enlarge the gap, in fact, this is not correct.
Usually, if the blade of the cutter blade is too large:
— The sheet metal will be nipped by the upper and lower blade and it is very difficult to take it out.
This will not only wear out the blade but may also lead to the shearing machine stopping.
However, this condition will not be obvious for cutting thick plate.
After long use of the shears, the gap between the blades needs to be adjusted.
Generally, we recommend setting the blade clearance around 10% of the metal sheet thickness.
The lower blade is fixed on the hydraulic shearing machine, and the blade clearance can only take the lower blade as the baseline to adjust the upper blade to achieve the ideal blade clearance.
The minimum clearance should be adjusted between 0.05-0.1 mm.
Such as range at the ends of the blade clearance, can be adjusted by adjusting the pole (see below figure), (loosening the lock nut at the bottom of regulating lever, turn the adjusting lever until the clearance is equal on both ends of the upper and lower blade, twist lock nut).
If the clearance between the lower blade does not conform to the requirements, can be adjusted by referring to the following figure, to adjust allen screw M16*60 and M12 * 65 to adjust the blade gap between the blade, in order to make the parallelism allowance of the upper and lower blade within 0.05 mm.
Of course, to get the ideal blade clearance, the M1265 and M1660 inner hexagon screws must be adjusted repeatedly.
Maintenance of Hydraulic Shearing Machine
The daily maintenance of the shears includes daily lubrication, tank cleaning and cleaning of the shearing machine.
1. Safety instructions
- When any maintenance is carried out on the shearing machine, the machine must be cut off.
- The power must be switched on for 20 seconds before the capacitor and the servo amplifier discharge completely.
- When the hydraulic parts work, the slider may move, and the following matters must be noted:
1> shall not be placed arms or feet between the upper and lower blades;
2> before removing the valve:
- Shut off pump
- Lower the slider to the oil cylinder without the oil
- If can’t lower the slider, pad it with a wooden block, and pay attention to the pressure within the system due to the movement of the slider valve removal.
- No operation shall be performed on the shearing machine that has not improved safety protection
2. Shearing machine lubrication
The shearing machine is lubricated by week (or every 40 hours).
Use the calcium base grease, and the grease gun is injected into each lubrication point.
The lubrication points are shown below：
|1||Ball screw, nut and screw end bearing||Calcium base grease|
|2||Guide rail and slide guide base||Calcium base grease|
|3||Sliding block guide rail||Calcium base grease|
|4||Guide rail and clearance adjustment screw and nut||Calcium base grease|
3. The hydraulic oil and calcium base grease
The shears are recommended to use the following hydraulic oil:
|GULF||HARMONY 46 AW|
|TBXACO||RANDO OIL 46|
|MOBIL OIL||MOBIL DTE 25|
4. Change hydraulic oil
Hydraulic oil should be replaced after 2000 hours of operating for the first time, later replace the oil after every two years or 4000 hours of work.
- Prior to the removal of the tank cover and access to the tubing, the area must be cleaned to prevent contamination.
- Draining the hydraulic oil when the hydraulic oil is warm, and the slider is at the upper dead point.
- Clean the inside of the tank with a clean cloth and a suitable solvent
- Replace oil filters
- Replace the new hydraulic oil
- Before the shearing machine is reworked, starting oil pump circulates the hydraulic oil for about an hour.
5. Hydraulic shearing machine maintenance procedures
In order to ensure the reliable operation of this shearing machine, the following procedures must be paid attention to.
This procedure is graphically represented.
The following listed time is based on the 5 days per week, working 8 hours a day.
|Item||The attention points||Period|
|Whole body||Brush the dust and dirt on the machine, gently oil the blade||weekly|
|Backgauge support bearing||Gun lubrication||weekly|
|Backgauge ball screw||Gun lubrication||weekly|
|Slider guide rail||Check the derrick adjustment||3 month|
|Check backgauge positioning||If the position error of the backstop blocks exceeds + 0.1mm, please reset||3 month|
|Hydraulic parts and systems||Check the tank oil level. If you need to replace the new oil, change the filter to 20um||weekly|
|Drain the old oil and add the new oil||12 months for the 1st time|
|Check all valves, hydraulic system, tubing and connectors to prevent leakage, blockage and replacement when necessary.||3 month|
|Check the cleanness of the import and export filters||3 month|
|Footswitch||Check foot switch pedal, in case of deformation, breakage, etc||monthly|
|Electrical control equipment||Check the limit switches in the electric cabinet, and the wear and burn must be replaced in time||3 month|
|Shears||Observe wear and abnormality of air metal shears||3 month|
|Finger protector||Check the sheet shears protection device to prevent the finger from entering the dangerous area||monthly|
Hydraulic Shearing Machine Troubleshooting
Hydraulic Shearing Machine Instruction Manual
You can click the below link to view both the instruction manual for swing beam shears as well as guillotine shears.
Hydraulic Shearing Machine Drawing
** Hydraulic shears circuit diagram
Here are the drawings:
** Hydraulic schematic diagram
Here are the drawings:
1. The slider up and down movement
When the oil of the main oil line is into the three-position four-way directional control valve S6, S6Y1A gets electric.
The oil enters into S6B via S6P, opens one-way valve S8, and oil enters the lower chamber of the right cylinder(The left and right cylinders are connected in series), making the oil fluid from the right tank into the lower chamber of the left cylinder.
The oil in the upper chamber of the left cylinder enters S6A and enter S6T, to make the slider go up.
If S6Y1 gets electric, the oil will enter S6A via S6), then enter into the upper chamber of the left cylinder, then enter the upper chamber of the right cylinder.
The oil will overcome the pressure of back pressure valve S7 to enter S6T via S6B, then back oil tank, to make the slider go down.
2. Shear angle adjustment
If there is no set value in the shear angle of the shearing machine, the sliding block cannot operate up and down.
Therefore, the shear angle must be in the state of the controller setting.
The adjustment of shearing angles is as follows:
When the oil is into the three-position four-way directional control valve S2, and Y2A gets electric, then oil will enter S2B via S2P, open hydraulic control single-way valve S3, enter the lower chamber of the left cylinder and upper chamber of right cylinder cause the upper chamber of the left oil cylinder cannot form a circuit, so the left oil cylinder does not move.
When the oil in the lower chamber of the right cylinder is back to the oil tank via S6T, back pressure valve S7 and S6B valve, the cutting angle becomes small.
On the contrary, if Y2B gets electric, the oil will enter S2A via S2P, open single-way valve S4, and enter the lower chamber of the right oil cylinder.
The oil in the upper chamber of the right cylinder can only enter the hydraulic control single-way valve S3 (At this point, the S3 valve is in the open state), oil enter S2T via S2B, and the shearing angle turns big.
The relationship between shear angle and shear force:
|Mild Steel (mm)||6||8||10||13||13||13||13||16||16||20|
|Stainless Steel (mm)||3||4||6||8||8||8||8||10||10||12|
|Shear Force (KN)||132||220||430||730||620||620||650||730||850||1270|
|Shear Angle Adjustment (°)||0.5-2.5||0.5-2.5||0.5-2||0.5-2||0.5-2.5||0.5-2.5||0.5-2||0.5-3||0.5-2.5||0.5-3|
3. The work of the hold-down cylinder
When the oil enters directional control valve S9 via clamping proportional control valve S10 (Its proportional pressure is controlled by an electrical ark pressure adjusting switch), when S9 gets electric, the oil will enter S9A via S9P, then enter the upper chamber of clamping device, press the clamping piston down to form compression, when S9 lose electric, the clamping piston will be press upward via clamp’s built-in spring, which forces the oil in the upper chamber of clamping cylinder enter S9T via S9 valve, the clamping device is reset.
** Hydraulic shearing machine structure drawing
List of Vulnerable Parts of The Hydraulic Shearing Machine
Hydraulic Shearing Machine Operator’s Responsibility
Under the leadership of the sheet metal workshop director, learning to abide by the regulations of the company, obey leadership arrangements, staff solidarity, positive efforts, act on saving, do good work, to produce qualified products.
- Responsible for daily routine maintenance, checking, repairing, adjusting and tightening the shears, and keeping records.
- Be familiar with the safety technical operation procedures of the work, and strictly follow the safety technology and operating procedures.
- Master the normal operation method of the shearing machine, can accurately judge the abnormal situation of the machine, and take emergency measures timely and correctly.
- Operate strictly according to the operating rules, the equipment can be started when the working environment is normal.
- Check whether the oil storage tank is sufficient, and check the valve and pipeline after starting the oil pump, and the pressure should meet the requirements.
- Observe the resistance of the blade movement and start cutting when the test is normal. It is strictly prohibited to start suddenly.
- It is not allowed to cut the laminated sheet material, not to trim the edges of the plate with burrs, and it is forbidden to shear the narrow plates and short materials that can’t press tightly.
- The clearance between the blades shall be adjusted according to the thickness of the sheet, but shall not be greater than 1/30 of the thickness of the plate.
- The blade should be fastened firmly, and the upper and lower blade shall be kept parallel to prevent accidents.
- The edge of the blade should be kept sharp. If the edge of the blade becomes dull or cracked, the blade should be repaired and replaced in time.
- When shearing, the pressure material shall be firmly pressed on the plate, and shall not be cut under pressure.
- The hydraulic valve is not allowed to adjust by yourself.
- It is forbidden to use the shearing machine for super length and super thickness, and it is not allowed to shear steel, high carbon steel, alloy tool steel, cast iron and brittleness material.
- Frequently check whether the fastening screw is loose.
- Do not operate the shearing machine alone. It shall be coordinated by two people to deliver the material, control the dimension accuracy and materials taking, and confirm that one person shall be unified in the command.
- Adjust the clearance of the shearing machine according to the thickness of the shear plate. It is not allowed to cut two different specifications and different materials.
- The fingers of the operator should stay at least 200mm away from the scissor shears mouth and leave the compression device.
- For the cutting thickness of the hydraulic swing beam shears, it shall be determined according to the curve diagram of the relationship between plate limit strength and plate thickness.
- No other items should be placed on the workbench.
- The cleaning must be carried out after stopping the shearing machine.
- After adjusting the blade (alignment), run the shearing machine in empty for the test.
- Before leaving work, should pile up the finished product, clear the field, cut off the power, and lock the switch box.
Price of Hydraulic Shearing Machine
The commonly used hydraulic shearing machines are mainly used to cut 4-8mm thick steel plates, with a width of 2.5-3.2m.
Generally, the price of 4 * 2500 hydraulic swing beam shear is about 6000usd, and the price of 6 * 3200 hydraulic swing beam shear is about 10000USD.
In addition, the price of the hydraulic guillotine shear is about 2000USD higher than that of the swing beam shear.
The difference between swing beam shear and guillotine shear can be checked here.
How To Choose The Right Hydraulic Shearing Machine
1. When purchasing the hydraulic shearing machine, we need to determine the specifications and cost range of the purchased machines according to our own purchase needs and product parameters.
2. When looking for a manufacturer, we first need to know whether the manufacturer has the required machines. This step seems simple, but it is easy to be ignored. You can read this post to learn the top 26 hydraulic shearing machine factories around the world, including the China hydraulic shearing machine company.
3. Because the models produced by different manufacturers are often different, manufacturers often provide various models of machines by ordering from other companies, so users should pay special attention to see if this model is what they need.
4. When you go to the company to see the machines, you need to know more. You can’t pay it blindly. First, you need to know the use of the machine and after-sales service. Considering many aspects, choose more suitable manufacturers with excellent prices and service.
5. After determining the manufacturer, the next step is to sign the contract and pay the deposit. When signing a contract with the manufacturer, you must check whether the contract terms are in breach of contract and unreasonable.