7 Useful Press Brake Tips and Tricks

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The press brake is commonly used in sheet metal manufacturing. There are many tips and safety guidelines to be noted.

For example, reduce the physical setup time of the press machine. Provide well-organized tool components.

Quickly place the sheet metal on the workbench. Programming the bending procedures, adjusting the workpiece parameters, and accurately positioning the workpiece. These measures can improve the working efficiency of the press brake.

Marking and Storage of Tools

When the workpiece is bent, the required tools and information can be quickly found to improve the work efficiency. This requires that the information required should be apparently marked on the machine or the tools. For example, the number, length, bending angle, radius, height and maximum load, etc.

Provide toolings support, and place the dies and tools on the support orderly. The tool cabinet can be customized to store different sizes and numbers of toolsets.

The tool cabinet shall be located as close as possible to the press brake for easy access during operation. The tool cabinet can prevent toolings damage and facilitate toolings replacement. The tool cabinet can also be moved to other processing sites by means of a fork truck.

Remove Die Marks

Sometimes, the dies will leave traces after bending the workpiece. A press brake dies film can be used to remove traces of the dies. Polyurethane non-destructive films are most commonly used for bending aluminum and stainless steel.

It is only necessary to tape and clamp the stain-free film on the top of the die for bending. This prevents the die from leaving traces on the workpiece. The main material of the non-fouling film is polyurethane film, which can be reused.

Select Appropriate Materials

The properties, tensile strength, and ductility of materials vary. These changes in material properties will affect the entire bending process.

The plates are formed into thick plates or thin plates by hot rolling or cold rolling. These materials differ in composition and rolling conditions.

During bending, the change of material characteristics changes the bending angle. The greater the hardness of the material, the greater the rebound on both sides of the bending.

Die and Workpiece Wear

After bending, the wear of the die or workpiece is related to the bending radius of the bottom die. This kind of wear will damage the surface of the V die and cause scratches on the surface of the workpiece.

When selecting the V-shaped die, compare the opening size and bending radius of the V die. Surface hardened dies can also be selected to reduce the possibility to wear.

Large Tonnage Bending

Before selecting the toolings, it is necessary to determine whether the bending tonnage is within the load range of the punch and die.

If the rated range of the die is 20 tons per foot and the workpiece to be bent is 3 feet long, the force exerted by the press brake on the workpiece shall not exceed 60 tons.

If this force is exceeded, it will cause damage to the press brake, toolings and workpiece, and even endanger the safety of the operator.

The clamp system of the press brake is also a powerful limitation. Exceeding the force range of the clamp will damage the clamping tools.

If you want to bend thick plates, you can also reduce the required tonnage by selecting a V die with a wider opening.

The V die shoulder with a hardened positioning rod can roll when the metal plate is bent, thus reducing the friction between the workpiece and the die. This reduces the bending force required for bending compared to a solid die.

However, the bending radius and flange length of the workpiece cannot be changed.

A large amount of lubricating oil can also be applied to the shoulder of the V die to reduce the friction generated during bending.

This method has the same effect as using rolling tools and can reduce the tonnage required for bending. It can be used occasionally, but the press brake needs to be cleaned after use.

Correct Abnormal Bending Angle

If the bending angle of the workpiece is inconsistent with the programmed angle, the tonnage may be insufficient.

Secondly, the bending stroke needs to be maintained for a certain time to form the bending angle.

In addition, the bending speed is too slow to quickly generate enough pressure on the plate. Different materials have different ductility and tensile strength, and the rebound degree is different after bending.

The opening width of the V-shaped mold also affects the final bending effect. If the bending angle is inconsistent with the programmed angle, you can try to increase the tonnage, improve the bending speed, and properly extend the action time on the workpiece during bending. Select a metal sheet with less rebound. Select the V-shaped mold with a large opening.

Adjustment of Back Gauge

The accuracy of the rear gauge can be adjusted by moving the stop finger of the rear gauge. Use the depth gauge to measure the error so that the distance between the stop finger and the center of the lower die is consistent.

The error of the x-axis is also measured. If there is an error, it is necessary to correct the x-axis reference point value, and then bend after correcting the error.

The X axis needs to be adjusted to be parallel to the mold. It is necessary to adjust the timing belt and move the screw on the x-axis forward or backward.

Measure whether there is an error at both ends of the x-axis beam. If not, tighten the screws on the timing belt and then conduct a bending measurement.

If there is an error in the y-axis, the position of the y-axis reference point needs to be corrected. Fix the slider below the bending transition point.

After adjusting the parameters of the Y1 and Y2 axes, carry out bending measurements and confirm that there is no error.

Conclusion

We introduced some precautions and tips when using the press brake. The use of the press brake covers many aspects of knowledge and experience. ADH has many years of rich experience in the field of bending machine manufacturing. For more information, please contact us to discuss more experiences.

We are a professional sheet metal machine manufacturer and service provider, including CNC press brake, fiber laser cutting machine, shearing machine, and slotting machine. If you have any ideas and requirements for the bending machine, you can contact our team members.

FAQs

What is the compensation of the bending machine?

The press brake will deflect under excessive load. Especially the center position of the ram and the worktable. The angle of the bent workpiece at the center and the angle at both ends are inconsistent. In order to compensate for the deflection, the press brake needs to be equipped with a crowning device that can generate the opposite force. This can counteract the deflection of the ram and the base.

How to tighten the timing belt?

Open the machine housing after stopping the press brake. Loosen the screws for fastening at the x-axis motor connecting plate. Tighten the screws after adjusting the position of the tensioner. Then install the machine shell.

How to change the filter of the press brake?

Turn off the power supply of the machine oil pump motor and the press brake. Open the machine housing. Remove the filter, replace it with a new one, and install the machine housing. Then start the power supply of the machine, pump the motor, filter the hydraulic oil for a period of time, and then operate the machine normally.

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