How to Improve Press Brake Bending Accuracy?

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There will be some errors that lead to the failure of press brake bending accuracy.

Sometimes it may be the mechanical factors of the machine that cause the bending accuracy to be not high enough.

Also, it may be some external factors, such as the bending tools, material thickness, or even some human operation factors.

This article will analyze the factors that affect bending accuracy from many aspects, and propose solutions for some common situations.

Machine Factors

press brake crowning

Straightness of the clamping opening of the ram of the press brake (Y direction and X direction).

The repositioning accuracy and arbitrary positioning accuracy of the left and right ram.

Whether the clearance between the ram of the press brake and the linear guide of the frame is reasonable.

Whether the perpendicularity and inclination of the frame are reasonable.

The connection between the oil cylinder and the ram.

Strength and accuracy of frame and ram.

The repositioning accuracy of the back gauge system is arbitrary (X direction and R direction).

Whether the computer system is properly adjusted.

Whether the hydraulic system is adjusted in place.

Matching degree of hydraulic system and computer adjustment.

Tooling Factors

Whether the upper and lower dies are accurate.

Die deformation, damage, wear and other phenomena will affect all aspects of metal bending. Once found, it shall be reported and corrected in time.

Inaccurate alignment of the upper and lower dies will lead to bending size deviation. Ensure that the toolings are in place during tool setting.

After the left and right positions of the back gauge move, the relative distance from the lower die changes. The vernier caliper can be used for measurement and then the back gauge screw can be used for fine adjustment.

Whether the lower die compensation device is accurate and matched the design of the frame.

The precision of the upper die fixture shall be high.

The opening size of the V-shape die is inversely proportional to the bending pressure. When the plate length and thickness are fixed, the larger the V-shape die opening, the smaller the pressure required.

Therefore, when manufacturing workpieces with different thicknesses, the correct V-shape die opening size should be used as required.

At one end of the press brake, that is, when processing with unilateral load, the bending pressure will be affected, and it is also a kind of injury to the machine, which is explicitly prohibited.

The middle part of the machine should always be stressed when assembling the toolings.

Sheet Metal Factors

The straightness of the datum plane of the sheet metal.

Whether the stress of the metal plate is uniform.

Whether the thickness of sheet metal is consistent.

When bending, the parallelism between the workpiece and the lower die is not enough, and the workpiece will springback after the upper die is pressed down, which affects the bending size.

The material properties and thickness will affect the bending angle, so the first inspection and spot check must be strengthened when each workpiece is bent.

Operation Factors

Whether the left and right thrusts are consistent when the operator pushes the bending materials.

The data error in the system is not adjusted properly when using the system.

When the primary bending angle is not enough, the secondary bending dimension will be affected.

The accumulative bending error will lead to an increase in the error of the workpiece outline dimension.

The pressure required varies with the length and thickness of the workpiece, and the length and thickness of the plate are proportional to the pressure.

It is necessary to change the bending capacity when the length and thickness of the workpiece change.


Many details need to be paid attention to improve the bending accuracy of the press brake.

In addition to adjusting the accuracy of each part of the machine, adjusting the accuracy of the tooling, and ensuring the correctness of the bending compensation, etc.

Pay attention to the daily maintenance and repair of the press brake, so as to prolong the service life and ensure bending efficiency.

Choosing a high-quality press brake is also an effective way to ensure efficient production.

ADH is a manufacturer of press brakes, with 20 years of experience in the sheet metal industry.

Browse our press brake product page, or click the contact us page to obtain detailed product and price information.

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