Hydraulic Press Brake

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Panel Bender

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# How to Make Calculation for Press Brake Dies Testing?

## Introduction

The testing of press brake dies before mass production will be needed to ensure that the angle and dimensions of the bending workpiece can meet the tolerance requirements, and to detect the interference of the arranged top blade.

Generally, the following three methods will be used.

## Waste Material Calculation Method

Input a specific data in the controller, and bend the sheet metal with the same thickness for one time.

Adjust the distance of the back stopper according to the obtained data (increase or decrease), or modify the data directly.

You can also enter the compensation value (increase or decrease), and finally get the value consistent with the set value. Actual demand size – b = residual value

Actual demand size – residual value = input value (b is the distance from the positioning plate to the position where the bending tool tip contacts the workpiece)

If the actual demand size = 10mm, b = 9.2mm, the residual value = 10-9.2 = 0.8mm, the input value = 10 + 0.8 = 10.8mm;

Input 10mm directly in size display box the controller and input 0.8mm in the a compensation value. Both are acceptable.

## Mold Calculation Method

Input a specific data in the controller, and use a caliper to measure the distance from the positioning to the mold.

Subtract the distance from the outer edge of the lower die to the center of the groove by the obtained size, and then adding the material thickness and a 1/2 inner bending factor, you will get the required sizes. b=c-a

Actual demand size = b + 1/2 inner bending factor + plate thickness, b is the distance from the positioning plate to the position where the bending blade tip contacts the workpiece.

For example,

The thickness of the sheet t=1mm, a=7mm, c=15mm, b=15-7=8mm, the actual demand size=8+0.1+1=9.1mm

## Press Line Method

Input specific data in the controller. After the sheet is pressed with the line, measure the length of the material with a caliper plus the thickness of the material and 1/2 internal bending factor, then you will get the required size. For example,

The thickness of the sheet t=1mm,b=9mm, the actual demand size=9+0.1+1=10.1mm

b is the distance from the positioning plate to the position where the bending blade tip contacts the workpiece.