CNC bending machine is an important equipment in modern CNC machining technology, mainly used for shaping and processing metal sheets. Therefore, its performance and quality directly affect the quality of processed products and involve issues related to production safety.
Leakage testing is an essential part of quality inspection for CNC bending machines, especially for assessing sealing performance.
This article introduces the steps for leakage testing of CNC bending machines.
I. Preparatory Steps
Before conducting leakage testing on CNC bending machines, cleaning and inspection should be carried out. The sealing performance of the hydraulic system of the CNC bending machine needs to be checked. If any issues are found, damaged seals should be repaired or replaced promptly, and the equipment should be thoroughly cleaned.
II. Preparation for Testing
1. Ensure that the air source is in normal working condition.
2. Clamp the metal sheet tightly to ensure close contact on both sides.
3. Confirm that there are no bubbles, paper scraps, or oil stains in the dual-action cylinders of the CNC bending machine.
4. Confirm that there is no leakage at the interfaces of the various pipelines of the CNC bending machine.
III. Testing Steps
1. Check for any leaks before starting the machine. If there are leaks, inspect the filter element or turn off the power of the equipment for timely repairs.
2. After the motor starts running without any mechanical action, perform a manual single-action leakage test. Start the oil pump.
3. Adjust the adjustment handles of the left and right cylinder control valves separately to achieve single-cylinder stroke movement.
4. Observe whether the stroke is uniform and pay attention to any oil leakage at various joints and sealing positions.
5. Perform a manual double-stroke leakage test. Start the oil pump and set the central directional valve switch to automatic or manual position.
6. Manually operate the switch to make the left or right cylinder start moving and observe whether the dual-action cylinders move uniformly.
7. If there are abnormal sounds or sticking, inspection and repairs are required.
8. Clamp the metal sheet tightly to ensure close contact on both sides and continue the double-stroke testing.
9. Observe whether the dual-action cylinders move uniformly and pay attention to any oil leakage at various joints and sealing positions.
10. Continue with a more complex double-stroke leakage test with the upper die. Observe the deformation of various feed positions and the processing process.
11. Pay attention to whether there is oil stain or oil leakage on the machine and its surroundings.
IV. Test Results
During the testing, any leakage phenomena should be recorded in a table. If the problems listed in the table have been resolved, it can be determined that the quality issues during that period of time have been resolved or mostly resolved. If there are any problems, they should be promptly addressed to minimize quality losses.
After identifying any issues, immediate machine shutdown, repairs, and replacement of components are necessary to ensure the performance and quality of the equipment.
In summary, the leakage testing steps for CNC bending machines mainly include pre-checks and preparations, manual single-action, manual double-stroke, and double-stroke with upper die testing. Leakage phenomena should be recorded, and various issues should be promptly addressed to minimize quality losses. Only by ensuring reliable sealing performance of the hydraulic system can the quality of the processed products be guaranteed, improving the production and economic benefits of the enterprise.
