Reasons for the middle of the bent workpiece in a press brake can be classified into three categories:
1. It may be due to uneven upper and lower blades. In order to achieve the desired angle, the back gauge is adjusted, resulting in consistent angles but insufficient straightness.
2. It may be caused by a lack of deflection compensation, similar to the first reason.
3. A method that can be used is to use a dial indicator to check the parallelism between the upper ram and the lower worktable, identify the cause, and find a solution.
Recommended actions to take:
1. Use a CNC press brake. The press brake should be programmed or inspected based on the plate thickness, plate length, bending force, and size of the lower die groove (the die size should generally be greater than or equal to 8 times the plate thickness).
2. Align and set up the production mode.
3. Confirm the free movement and debugging between the high and low production modes.
4. Confirm the positioning of the front and rear stops.
5. Confirm the "jog," "single," or "continuous" operating modes and use a switch to select the mode.
6. Position the pressure test work on the bending machine table.
7. Fine-tune the gap in the production mode again, ensuring that the press brake is not in the test mode during the adjustment.
8. Pay attention to the tight and closed state of each sealing part, and promptly detect any changes or leaks in the sealing.
Precautions:
1. Check the alignment and solidity of the upper and lower dies, and ensure that the positioning of each device meets the requirements.
2. Run the program to return to the home position when the upper ram and the positioning axes are not in their original positions.
3. After the equipment is started, let it idle for about 2 minutes and perform 2-3 forming movements of the upper ram. If any faults are detected, 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 maintains timely communication and coordination with the operators. All personnel involved should ensure they are in a safe position.
5. When bending the sheet metal, it must be firmly pressed to prevent the sheet from lifting and causing injury during bending.
6. When adjusting the sheet during membrane pressing, the power supply must 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 behind the machine tool while it is in operation.
9. If the mold is misaligned during operation, it should be stopped immediately for correction. Manual correction 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 damaging the machine tool.
11. Regularly check the alignment of the upper and lower dies.
12. Before shutting down the equipment, place wooden blocks under the lower die below the oil cylinders on both sides and lower the upper ram onto the wooden blocks.
13. Exit the control system program and then cut off the power supply.
