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  • Adjustment of press brake’s mechanical part

Press Brake FAQs

  • How to adjust the size of the press brake?
  • How to adjust the angle of the press brake?
  • How to compensate deflection of press brake machine?
  • The press brake can’t go up and down. What’s the matter?
  • How to bend an arc with a press brake?
  • Comparison between grating ruler and magnetic grating ruler of press brake
  • Up and down moving type of press brake, which is better?
  • What is the problem that the downward speed of the hydraulic press brake suddenly slows down during operation?
  • The bending angle of the press brake is different
  • How long to change the hydraulic oil of the press brake?
  • List of hazard sources and risk assessment form of press brake
  • List of minimum bending radius of common metal materials
  • How many press brake controllers are there? How to choose?
  • How to choose between open loop and closed loop press brake?
  • What is a three cylinder press brake?
  • What is a four cylinder press brake?
  • What is the difference between three cylinder press brake and two cylinder press brake?
  • Why can’t the press brake machine return?
  • What are the functions of three motors of ordinary press brake machine?
  • What are the functions of the three relief valves on the press brake?
  • What if the press brake doesn’t go up when it comes down?
  • The press brake is normal up and down, but it is not pressurized!
  • Where does the number of backgauge axis (X,Y,Z,R) of press brake refer to?
  • How does the X-axis of press brake return to the origin?
  • Why the Y-axis of press brake does not return?
  • How many times to bend a large arc and how to calculate the bending angle?
  • How to adjust the stroke of the press brake?
  • The pressure at both ends of the hydraulic press brake is not the same. How to adjust it?
  • The cylinder stroke on both sides of the press brake is different. How to adjust it?
  • How to program CNC press brake?
  • How to adjust the downward speed of the press brake?
  • How to calculate the size and angle of sheet metal bending?
  • How to calculate the nominal pressure required by the press brake according to the thickness and length of the steel plate to be bent?
  • How to calculate the unfolded dimension of sheet metal bending?
  • How is the bending coefficient of sheet metal calculated
  • What is the relationship between bending factor and plate thickness, bending angle and bending radius?
  • How to calculate the bending coefficient of sheet stainless steel?
  • How to calculate the tolerance of sheet bending machine?
  • What is the reason why the middle of the folded workpiece is bent?
  • Why can’t the hydraulic press brake go up and down?
  • How can the angle of the press brake be adjusted if it cannot be pressed at right angles
  • How to fold different angles with a press brake?
  • How to disassemble the oil cylinder of the press brake?
  • The press brake cannot be started
  • How to eliminate the bending indentation of stainless steel press brake die
  • How to adjust the downward speed of the press brake machine?
  • What’s wrong with the unstable pressure of the press brake?
  • Why can’t the press brake machine rise?
  • What about the deformation of the press brake ram?
  • How does press brake bend a cone?
  • How to use press brake to fold a large circular arc?
  • What’s the matter with the slow down speed of the press brake?
  • What if the downward speed of the press brake is fast?
  • The downward speed of the hydraulic press brake becomes slow and the upward jitter!
  • What happened to the hydraulic oil leakage on one side of the press brake?
  • The two cylinders of the press brake are not synchronized
  • What if the workpiece interferes with the press brake machine?
  • Can the press brake machine fold the U-groove?
  • Environmental requirements of CNC press brake
  • What happened to the abnormal noise of the press brake oil pump motor?
  • A simple method for electric heating of hydraulic oil of press brake
  • What’s wrong that the press brake punch can’t lower to the bottom?
  • How to select the size of the lower V groove for sheet metal bending according to the plate thickness
  • How to break the lock of the press brake?
  • How to determine the bending radius of sheet metal?
  • How to solve the problem that the press brake pressurizes too slowly? How to pressurize quickly
  • What hydraulic oil does the press brake use?
  • How many years to change the press brake hydraulic oil?
  • What determines the sheet metal bend radius?
  • Stress relief of stainless steel 304 after bending
  • What are the corresponding protective devices of the press brake?
  • How to adjust CNC press brake?
  • What is the reason for the noise of press brake?
  • How to solve the oil leakage of oil cylinder of the press brake?
  • How to repair the scratches on mirror stainless steel?
  • How much can the bending tolerance of the press brake be controlled?
  • What is the minimum bending size of the press brake?
  • Where is the pressure relief after pressurization of the press brake adjusted?
  • How to choose electro-hydraulic servo synchronous cnc press brake?
  • How to fold a semicircle with a pres brake?
  • How is the inner radius of sheet metal bending determined?
  • How to calculate the bending radius of sheet metal?
  • How to set bending radius and bending deduction in SolidWorks?
  • The most complete sheet metal bending allowance table
  • How to set the K factor, bending deduction, bending allowance and bending calculation in SolidWorks? What’s their relationship?
  • How does the press brake accurately control the bending angle?
  • What is the reason why the blade of press brake can’t rise?
  • Which axes do the 3 + 1 axis and 4 + 1 axis of the press brake refer to respectively?
  • What does the Y value limit of press brake mean?
  • Function of time relay in press brake circuit
  • What is the difference between electro-hydraulic servo press brake and torque synchronous press brake?
  • What hydraulic pump is generally used for press brake?
  • How do you know what material the lower die of the press brake is?
  • When the press brake steps up, it cannot stop and automatically slides down
  • How to understand the N + 1 axis of press brake machine?
  • How to change the tool of press brake?
  • What material is generally used for press brake dies? What is the hardness?
  • Do you need to grind the top punch of press brake?
  • How to level the tools of press brake?
  • What is the problem that the press brake tools are not in a straight line?
  • How to repair the crack of stainless steel bending tool?
  • How to select the material of press brake die?
  • What is the problem of automatic tool drop of ordinary press brake?
  • How does the press brake go down slowly?
  • What is the difference between the acute punch and gooseneck punch of press brake?
  • The press brake tool has dents. How to repair it?
  • What is the quenching hardness of general press brake die?
  • Calculation formula of press brake die price
  • What is the general angle of the press brake dies?
  • How to select arc radius punch and die of press brake?
  • How to calculate the bending angle of the press brake?
  • What are the factors that determine the service life of press brake die?
  • How to select the top punch of the press brake?
  • Golden section size of press brake dies
  • Anti rust treatment of press brake dies
  • Comparison chart of press brake die combination
  • The press down pressure of the press brake machine is not enough, but the rising pressure is normal

Press Brake Hub

  • What is CNC press brake and it’s working principle
  • Brief introduction of synchronous system of CNC press brake
  • Workpiece bending diagram of press brake
  • Installation of CNC press brake
  • Operation of CNC press brake
  • Adjustment of bending parameters of CNC press brake
  • Bending accuracy of CNC press brake
  • Safety protection of CNC press brake
  • Press brake punch and die installation
  • Adjustment of CNC press brake
  • Hydraulic oil of CNC press brake
  • Lubrication of CNC press brake
  • Repair and maintenance of CNC press brake
  • Main structure of CNC press brake
  • Explanation of CNC press brake axis
  • Operating environment of press brake
  • Press brake punch and die selection
  • Adjustment of press brake’s mechanical part
  • Causes and solutions of common faults of press brake

Guillotine Shear Hub

  • Purpose and characteristics of the guillotine shear
  • Main structure of the guillotine shear
  • Hydraulic system of the guillotine shear
  • Lifting and installation of the guillotine shear
  • Lubrication of the guillotine shear
  • Operation and adjustment of the guillotine shear
  • Safety and maintenance of the guillotine shear
  • Guillotine Shear: Common Faults and Troubleshooting
  • Accuracy check of the guillotine shear
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  • Adjustment of press brake’s mechanical part

Adjustment of press brake’s mechanical part

Table of Contents
  • Adjustment of ram
  • Parallelism adjustment of the backgauge beam
  • Rear stop finger adjustment
  • X-axis synchronous belt adjustment
  • Timing belt tension adjustment method

Adjustment of ram #

After the ram guide rail has been used for a period of time, because the ram has been reciprocating up and down, the guide rail will be worn or loose after long-term use of the press brake, which is manifested in large shaking of the ram during movement and poor sheet metal bending accuracy.

At this time, the clearance of the ram guide rail needs to be adjusted.

After the guide rail is loose, the possible phenomenon is that the ram vibrates greatly during operation and the bending accuracy of the workpiece is not high.

Guide rail adjustment method:

1. The ram guide rail stops in the middle of the guide rail;
2. Loosen the lock nut first, tighten all the adjusting screws with an Allen wrench, and then loosen it slightly to tighten the lock nut;
3. Use a feeler gauge to measure the gap between the body’s guide rail and the ram guide rail to ensure that the maximum gap before and after the upper and lower positions of the guide rail does not exceed 0.03mm. Under the diagnostic state, the ram will slide automatically. If it cannot slide automatically, the guide rail gap is too tight and must be loosened a little until the guide rail gap is adjusted properly;
4. Run the machine and observe the operation of the ram.

Parallelism adjustment of the backgauge beam #

After the press brake runs for a period of time, check the parallelism of the x-axis beam to the center of the lower die.

If it is found that the same stop finger is used for positioning, and the size of the folded workpiece is different when the stop finger is at different positions on the left and right of the bottom die, it is necessary to adjust the parallelism of the rear stop beam to the center of the lower die.

Parallelism fine adjustment method:

1. Determine the specific value of the parallelism deviation of the rear retaining beam to the center of the lower die through measurement;
2. Use a dial indicator to touch the end with a large distance from the center of the die to the lower die, so that the indication of the dial indicator is greater than the adjustment amount, and record the indication on the dial indicator;
3. Loosen the lock nut, fine-tune the position of the cross beam forward by adjusting the Allen screw, and make it conform to the determined deviation value by observing the indication value of the dial indicator during the adjustment process;
4. Tighten the lock nut;
5. Run the press brake to detect the adjusted accuracy, and the parallelism between the beam and the lower die center shall be ≤ 0.1mm;

Note:

This adjustment method is suitable for the parallelism deviation between the rear retaining material and the lower die center is less than 0.4mm.

If the deviation is too large, loosen the timing belt on the X-axis, and adjust the front and rear position of one end of the X-axis cross beam by rotating any one of the ball screws until the X-axis cross beam is parallel to the center of the lower die.

If there is a small error, it can be completed by fine adjustment.

Rear stop finger adjustment #

When bending the workpiece, if there is a deviation in the size of the two stop fingers, first check the parallelism of the rear stop beam.

If there is no problem with the parallelism, adjust the rear stop finger.

Adjustment method

(1) Determine the positioning deviation of the two rear stop fingers through measurement.
(2) Use a dial indicator to touch the end of the baffle plate of the adjusted rear stop finger, and the indication on the dial indicator shall be greater than the deviation value.
(3) Properly loosen the two M10×30 socket head cap screws on the baffle seat so that the baffle seat can move.
(4) Adjust the M8 adjusting screw, move the rear baffle seat, and observe the value shown on the dial indicator to make it conform to the deviation determined by measurement.
(5) Tighten the two M10×30 hexagon socket screws on the baffle seat, and keep the setting value of the dial indicator unchanged during the tightening process.
(6) Run press brake, try to break the workpiece, and check whether the precision of the rear stop finger after adjustment meets the deviation requirements. If the requirements are still not met, readjust according to the above method.

X-axis synchronous belt adjustment #

The rear retaining beam is driven by the X-axis servo motor to rotate the left and right lead screws synchronously through the synchronous pulley and synchronous belt, so as to realize the front and rear movement of the rear retaining beam and rear retaining finger.

After the press brake works for a long time, there will be relaxation in the rear retaining synchronous belt, which shows that the swing range of the synchronous belt is too large in the working process, and too loose synchronous belt will affect the accuracy of the X-axis.

The operator of the press brake shall often check the tightness of the synchronous belt.

If the synchronous belt is too loose, the tensioning wheel of the synchronous belt shall be readjusted to make the tension of the synchronous belt moderate.

The tension force shall be adjusted appropriately.

If the parallelism of the rear retaining beam exceeds 0.4mm, the position between the synchronous belt and the synchronous wheel of the right lead screw needs to be adjusted.

For each tooth adjusted between the synchronous belt and the synchronous wheel, the lead screw moves 0.71mm in the X-direction.

Timing belt tension adjustment method #

1. Loosen the locking nut of the tensioning wheel.
2. Move the tensioning pulley upward to ensure proper belt tightness.
3. Lock the locking nut of the tension wheel.

Related:

  • Causes and solutions of common faults of press brake
  • Operation of CNC press brake
  • Brief introduction of synchronous system of CNC press brake
  • Repair and maintenance of CNC press brake
  • Main structure of CNC press brake
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Updated on May 30, 2022
Press brake punch and die selectionCauses and solutions of common faults of press brake

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Table of Contents
  • Adjustment of ram
  • Parallelism adjustment of the backgauge beam
  • Rear stop finger adjustment
  • X-axis synchronous belt adjustment
  • Timing belt tension adjustment method
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