Common Fault Handling and Maintenance Methods for 630-ton Hydraulic Press

I. Action Failure:

   - Electrical wiring is loose or connected incorrectly. Check the electrical connections.

II. Slider Creeping:

1. Accumulated air or pump cavitation in the system.

2. Improper precision adjustment or lack of oil in the column.

   - (1) Check for air intake in the pump suction pipe, then perform multiple up and down movements with pressure.

   - (2) Add machine oil to the column, and readjust the precision.

III. Excessive Support Force during Slow Descent of the Slider:

   - Adjust the back-pressure valve to ensure that the upper chamber of the cylinder is not pressurized, not exceeding 1 MPa.

IV. Severe Slider Sliding After Parking:

1. Cylinder port sealing ring leakage.

2. Pressure valve adjustment pressure is too small or the port is not tight.

   - (1) Observe the cylinder port; if oil leakage is found, release the air.

   - (2) Adjust the pressure and check the valve port.

V. Pressure Gauge Pointer Swings Violently:

1. Air in the pressure gauge oil circuit.

2. Mechanical vibration in the pipeline.

3. Damaged pressure gauge.

   - (1) Slightly loosen the pipe joint during pressurization to release air.

   - (2) Secure the pipeline.

   - (3) Replace the pressure gauge.

VI. Insufficient High-Pressure Stroke Speed, Slow Upward Pressure:

1. High-pressure pump flow is set too small.

2. Pump wear or burning.

3. Severe internal leakage in the system.

   - (1) Adjust according to the pump's manual; adjust the pump eccentricity to 5 grids at 25 MPa.

   - (2) If there is significant leakage at the pump return port, dismantle and inspect.

VII. Rapid Pressure Drop During Pressure Maintenance:

1. Various valves involved in pressure maintenance are not tight, or there is oil leakage in the pipeline.

2. Damaged sealing ring in the cylinder.

   - (1) Check the sealing condition of the filling valve, pressure-holding relief valve.

   - (2) Replace the sealing ring.