A hydraulic press brake is a crucial machine in the metalworking industry, used to bend metal sheets into precise shapes. Proper adjustment, operation, and maintenance are essential to ensure its efficiency and longevity. This article provides comprehensive guidelines on adjusting the bending size and angle, setting CNC parameters, and regulating hydraulic pressure.
Adjusting the Bending Size and Angle
Size Adjustment
Adjusting the bending size involves modifying the position of the back gauge:
1. Coarse and Fine Adjustment: Use the buttons located at the lower right of the press brake for both coarse and fine adjustments.
2. Back Gauge Positioning: Ensure the back gauge is positioned correctly to achieve the desired bending dimensions.
Angle Adjustment
Adjusting the bending angle requires changing the depth of the punch into the V-die:
1. Depth Control: Use the wheel on the right side of the angle adjustment mechanism to set the punch depth.
2. Depth Limit: Ensure that the punch depth \( S \leq 100 \) to avoid overloading the machine.
Operating Instructions
Preparation
1. Determine Bending Force and V-Die Size: Calculate based on the thickness and length of the sheet metal.
2. Align Dies: Ensure the upper and lower dies are centered and adjust the gap accordingly.
3. Set Back Gauge and Workflow: Position the front and rear gauges and switch according to the process flow.
4. Position Workpiece: Place the workpiece at the center of the hydraulic press brake table and measure the pressure.
Adjustment and Operation
1. Adjust Die Gap: Re-adjust the gap between the dies if necessary. Modify the upper die adjustment block if required.
2. Check Seals: Ensure all seals are intact and replace any that are leaking.
3. Back Gauge Adjustment: Utilize the electric quick adjustment and manual fine-tuning options similar to those used for a guillotine shear.
4. Start Bending: Press the foot pedal to initiate bending. Release the pedal to stop the operation; pressing it again will continue the bending process.
Setting CNC Parameters on a Press Brake
CNC press brakes are widely used in the metal processing industry. Here’s how to set parameters:
Steps for Setting Parameters
1. Self-Test Before Start-Up: Perform a self-check to ensure the machine is functioning properly.
2. Access Parameter Setting Interface: Depending on the model, this may involve using a touchscreen or physical buttons.
3. Select Parameter Type: Choose the type of parameter to set, such as bending angle, speed, or pressure. The interface will display all related parameters.
4. Input Parameter Values: Enter the required values, ensuring accuracy in units and figures.
5. Save Parameters: Click the save or confirm button to store the settings. Some models offer a parameter backup function.
6. Verify Parameter Settings: Use the preview or simulation function to check the accuracy of the settings.
7. Adjust Parameters if Necessary: If any issues are detected, return to the settings interface to make adjustments. Follow the equipment manual and operating procedures.
8. Complete Parameter Setting: Confirm and exit the parameter setting interface to start the bending operation. Monitor the machine’s working status closely.
Hydraulic Press Brake Pressure Adjustment
If a hydraulic press brake shows no pressure, the issue might be one of the following:
Possible Causes
1. Main Hydraulic Control Valve Spring Fault: The spring might be broken or malfunctioning.
2. Cylinder Internal Leakage: The cylinder seals might be worn out.
3. Solenoid Valve Spool Not Operating: The spool might be stuck or damaged.
4. Overflow Valve Malfunction: The valve might be stuck open or blocked.
5. Electrical Contactor Failure: The electrical contacts might be worn or faulty.
Pressure Adjustment Methods
To adjust and troubleshoot the pressure:
1. Check and Replace Hydraulic Control Valve Spring: Inspect the spring for damage and replace it if necessary.
2. Replace Cylinder Seals: If there is internal leakage, replace the seals and adjust the cylinder stroke.
3. Clean and Adjust Overflow Valve: Remove any blockages and ensure the valve operates smoothly.
4. Clean and Inspect Solenoid Valve: Ensure the solenoid valve is free of debris and operates correctly.
5. Check Electrical Contacts: Inspect and repair or replace faulty electrical contactors.
If these methods do not resolve the issue, the problem might be with the oil pump, and professional maintenance personnel should be contacted.
Conclusion
Proper adjustment, operation, and maintenance of a hydraulic press brake are essential for achieving precise and efficient metal bending. By following the detailed guidelines for size and angle adjustments, CNC parameter settings, and pressure regulation, operators can ensure optimal performance and longevity of the machine. Regular maintenance and timely troubleshooting are key to preventing and addressing issues, ensuring the press brake operates smoothly and reliably.
FAQs
How do you adjust the bending size on a press brake?
- Adjust the back gauge position using the coarse and fine adjustment buttons located at the lower right of the press brake.
What is the procedure for adjusting the bending angle?
- Use the wheel on the right side of the angle adjustment mechanism to set the punch depth, ensuring \( S \leq 100 \).
What are the steps for setting CNC parameters on a press brake?
- Perform a self-check, access the parameter setting interface, select parameter types, input values, save settings, verify, adjust if necessary, and complete the parameter setting.
How can you troubleshoot and adjust the pressure on a hydraulic press brake?
- Check and replace the hydraulic control valve spring, replace cylinder seals, clean and adjust the overflow valve, clean and inspect the solenoid valve, and check electrical contacts. If issues persist, contact a professional technician.
