How to use a single-column hydraulic press？

Using a single-column hydraulic press (also known as a C-type hydraulic press) requires strict adherence to operating procedures, taking into account both efficiency and safety.

1. Preparation before operation
(1). Equipment inspection
Hydraulic system: Check the oil level in the oil tank (should be at 2/3 of the oil window), and the oil should be clear and free of foam.
Confirm that there is no leakage in the hydraulic pipeline (focus on checking the high-pressure hose connector).
Electrical system: The emergency stop button is reset, and the travel switch is sensitive (manual trigger test).
Mechanical parts: The slider guide rail is fully lubricated (apply ISO VG68 guide rail oil). The mold mounting surface is free of cracks, and the parallelism of the upper and lower molds is ≤0.1mm/m.
(2). Mold installation
Alignment: Use a dial indicator to adjust the level of the lower mold to ensure that it is perpendicular to the direction of movement of the slider (deviation <0.05mm).
Tightening requirements: The T-slot bolts need to be tightened twice in diagonal order (the final torque refers to the mold weight, such as 50N·m for a 10kg mold).
(3). Safety protection
Grating/two-hand button test: When the grating is triggered, the slider should stop immediately, and the two-hand button needs to be pressed synchronously for more than 0.5 seconds before starting.
Protective cover positioning: Make sure the protective cover covers the dangerous area (fingers cannot be inserted into the mold cavity).

2. Operation process
(1). Start-up steps
Turn on the power and observe the direction of the motor (should be consistent with the oil pump mark).
No-load operation for 3 minutes: Repeatedly raise and lower the slider (stroke ≤ 100mm) to remove air from the oil circuit.
Set parameters: pressure (such as 20MPa), holding time (such as 5s), stroke speed (fast down 30mm/s, working feed 5mm/s).
(2). Processing operation
First piece debugging: After placing the test piece, jog down and switch to fine-tuning mode (0.01mm adjustment) before the upper and lower molds touch.
Batch production: When using continuous mode, the dimensions need to be checked every 10 pieces (such as the thickness tolerance of stamping parts ±0.05mm). 
(3). Emergency treatment
When the mold is stuck: Immediately pressurize the machine after emergency stop, switch to manual mode and then jog upward. It is strictly forbidden to force the pressure!
Oil temperature > 60℃: Stop the operation and check whether the cooler fan is running.

3. Maintenance
(1). Daily maintenance
Before the shift: Check the hydraulic oil temperature (10℃-50℃ is appropriate, and preheating is required at low temperatures).
After the shift: Clean the slider guide rail and wipe off the oil stains (cotton yarn is prohibited to prevent fibers from entering the oil circuit).
(2). Regular maintenance
Monthly: Clean the oil tank suction filter (must be replaced if the pollution indicator light is on). Check whether the cylinder seal is leaking oil (replace if the oil dripping amount is > 1 drop/minute).
Yearly: Replace the hydraulic oil (anti-wear hydraulic oil HM46) and high-pressure filter element. Calibrate the pressure sensor error (within ±1%FS).

4. Safety warning
Absolutely prohibited: Overload (the red area of ​​the pressure gauge is the limit value). Do not place tools or hands under the slider (even when the machine is stopped).
Protection failure response: If the light barrier is blocked, disconnect the power supply and troubleshoot.