In the manufacturing industry, the press brake is one of the crucial processing equipment widely used for shaping and processing metal materials. However, these machines may encounter a series of faults during operation, especially when it comes to slider issues. This article comprehensively analyzes the common faults of press brake sliders and their solutions, helping technicians to quickly and effectively address these issues, ensuring production efficiency and equipment safety.
Hydraulic System Pressure Loss
The hydraulic system is one of the most critical components of the press brake, and its performance directly affects the normal operation of the machine. When the hydraulic system experiences pressure loss, several aspects can be investigated to troubleshoot the issue.
1. Check the Electromagnetic System
- Confirm if the solenoid coil of the proportional relief valve is energized.
- Check if the voltage of the proportional solenoid coil meets the requirements.
- If there are issues with the electromagnetic system, inspect the related electrical connections and circuits.
2. Relief Valve Issues
- Inspect if the pilot-operated check valve and main spool are stuck.
- Check if the damping orifice is clogged.
- Disassemble and clean the relief valve to ensure the interior of the valve body is clean and unobstructed.
3. Power Supply Problems
- Phase sequence deviation in the three-phase power supply may cause motor reversal.
- Check the power supply wiring and phase sequence, and adjust if necessary to ensure normal motor operation.
Slider Transition from Fast to Slow Problem
When the slider experiences prolonged stopping time during the transition from fast to slow, it may be caused by the following issues.
1. Hydraulic Oil Issues
- Check if the oil level in the tank is too low, ensuring that the fill port is completely submerged in oil.
- If the oil level is low, replenish the hydraulic oil promptly, maintaining it at least 5mm above the fill port.
2. System Parameter Settings
- Check if the fast approach speed is set too fast, leading to insufficient filling of oil.
- Adjust the system parameters to appropriately reduce the fast approach speed.
3. Filling Valve Issues
- Check if the filling valve is fully open and if the spool is not flexible due to oil contamination.
- If the filling valve is stuck, perform cleaning and maintenance to restore the flexibility of the spool.
Slider Return and Bending Plate Problem
During the slider return and bending plate operation, if the slider returns normally but lacks force during rapid approach and manual slow descent, consider the following troubleshooting strategies.
1. "Two-Position Four-Way" Directional Valve Issues
- Check if the directional valve controlling the filling control oil path is working correctly.
- Ensure that the directional valve is not stuck or has no power supply connection issues, ensuring unobstructed oil flow.
2. Maintenance of Filling Valve
- Recheck if the filling valve is stuck or contaminated.
- Clean and repair the filling valve to ensure its normal operation.
Slider Return Speed Problem
If the slider return speed is too slow, it may be due to the filling valve failing to open correctly, and reference should be made to the solutions for the slider return and bending plate problems mentioned above.
Through the detailed troubleshooting and solution methods mentioned above, technicians can effectively identify and address the issues that press brake sliders may encounter during operation. This not only contributes to improving production efficiency but also extends the service life of equipment and ensures workplace safety.
