Reasons for the Middle of the Bent Workpiece to be Curved in Press Brake:
There are three possible reasons for the middle of the bent workpiece to be curved:
1. It could be due to uneven upper and lower blades. In order to achieve the desired angle, the quick clamp has been adjusted, resulting in the same angle but insufficient straightness.
2. It could be caused by a lack of deflection compensation, similar to the first reason.
3. The alignment between the upper slide and the lower worktable may not be parallel. Using a dial indicator to check the parallelism between them can help identify the cause and find a solution.
Recommended Actions:
1. Use a CNC press brake. The press brake should be programmed or inspected based on the plate thickness and length, as well as the bending force and size of the lower die groove (the die groove size should generally be greater than or equal to 8 times the plate thickness).
2. Align and set the production mode.
3. Confirm the freedom and adjust between the high and low production modes.
4. Confirm the positions of the front and rear material stops.
5. Confirm the "jog," "single cycle," or "continuous" operating modes, and use a switch to select.
6. Position the pressure test work on the bending machine's table.
7. Fine-tune the clearances again, ensuring that the press brake is not in the debugging mode with the debugging block.
8. Pay attention to the tight and closed state of each blocking part, promptly detecting and adjusting any changes in the sealing.
Precautions:
1. Check the alignment and stability of the upper and lower dies on the equipment, and then check if the positioning of each device meets the requirements.
2. Run the homing program when both the upper slide and the positioning axes are not at the origin.
3. After the equipment starts, let it idle for about 2 minutes and perform 2-3 forming movements of the upper slide. If any faults are found, stop immediately for inspection, eliminate the faults, and resume operation when everything is normal.
4. During operation, the equipment should be commanded by one person who communicates and cooperates with the operators. All personnel should ensure they are in a safe position.
5. When bending the sheet metal, it must be firmly pressed to prevent the material from lifting and injuring others during bending.
6. When adjusting the material during clamping, the power should be cut off and the operation stopped.
7. When changing the opening of the variable lower die, there should be no contact between the material and the lower die.
8. It is not allowed for anyone to stand at the rear of the machine tool while it is in operation.
9. If the mold is found to be misaligned during operation, it should be stopped immediately for correction, and manual correction with hands is strictly prohibited.
10. It is prohibited to use excessively thick iron plates, steel plates, advanced alloy steels, or materials that exceed the performance of the press brake to avoid damage to the machine tool.
11. The alignment between the upper and lower dies should be regularly checked.
12. Before shutting down the equipment, place wooden blocks under the lower die below the oil cylinders on both sides and lower the upper slide onto the blocks.
13. Exit the control system program and then cut off the power supply.
