Three core parameters need to be confirmed first:

1. Sheet parameters (material, thickness, yield strength, which determine the bending force and speed);

2. Die parameters (upper die edge radius, lower die opening width, the lower die opening width is usually 6-10 times the sheet thickness);

3. Bending angle (set according to the requirements of the workpiece drawing, with a reserved springback compensation of 0.5°-1°)

The core difference lies in bending force and springback compensation:

• • Low-carbon steels such as Q235: low yield strength, relatively small bending force, springback of approximately 0.5°-1°, and the compensation amount can be set to 1°;
  • Stainless steel (such as 304): It has high yield strength, so the bending force needs to be increased (usually 1.5-2 times that of low-carbon steel). The springback is about 1°-2°, and the compensation amount needs to be set to 2°.

Operate in 3 steps:

1. Manually lower the upper die to be close to the lower die, and measure the initial distance from “the lower surface of the upper die to the bottom of the V-groove of the lower die”;

2. Calculate the target depth using a formula based on the thickness and bending angle of the plate (or refer to the “depth-angle” comparison table provided with the equipment);

3. Lower the upper die in jog mode, test bend a piece of waste material, measure the angle, and fine-tune the depth until the angle meets the standard.

Prioritize adjusting 2 parameters:

1. Upper die edge radius: Replace the upper die with a larger edge radius (e.g., replace the original 3mm with 5mm) to increase the force-bearing area;

2. Lower die opening width: Within the allowable range, replace the lower die with a wider opening (e.g., replace the original 12mm with 16mm) to reduce the pressure per unit area.

The main reason is insufficient springback compensation. Solutions:

1. In the parameter settings, reduce the “target angle” (if 90° is required, set it to 88°-89°);

2. If the angle is still too large after compensation, the bending force can be appropriately increased (increase by 5%-10% each time to avoid overload). with 16mm) to reduce the pressure per unit area.

Check the following 3 places in order of priority:

1. Hydraulic system (whether the hydraulic oil is insufficient, whether the oil quality is turbid, and whether the filter element is clogged);

2. Mold connection (whether the fixing bolts of the upper mold and the slider, and the lower mold and the workbench are loose);

3. Guide rail and slider (whether the guide rail lubrication is insufficient and whether the slider gap is too large)

Two safety operations must be performed:

1. Press the emergency stop button to cut off the power source of the equipment;

2. Check whether the “two-hand start button” is functioning properly (the equipment has no response when one button is pressed alone, and starts only when both buttons are pressed simultaneously) to ensure the safety interlock is effective.

Perform 2 calibrations regularly (it is recommended to do it once a month):

1. Angle calibration: Try bending a standard template, measure with an angle ruler, and if the deviation exceeds 0.5°, correct it in the “parameter compensation” of the equipment;

2. Bending force calibration: According to the thickness of the plate, compare the bending force displayed by the equipment with the theoretical calculation value. If the deviation exceeds 10%, contact the manufacturer to calibrate the pressure sensor. one button is pressed alone, and starts only when both buttons are pressed simultaneously) to ensure the safety interlock is effective.