Harm and treatment method of 400 tons hydraulic press clamping

1. Slight hydraulic tightening increases the friction resistance of moving parts (such as valve core, Blade, plunger, piston, etc.) in the hydraulic components when moving, resulting in slow movement, even the phenomenon of movement disorder;

2. Severe hydraulic tightening makes the target moving parts in the hydraulic components completely stuck and unable to move, resulting in the phenomenon that they cannot move and the operating force of the handle increases.

Measures to Eliminate hydraulic clamping:

1. Improve the machining accuracy of valve core and valve body hole, and improve its shape and position accuracy. At present, manufacturers of hydraulic components can control the shape accuracy of valve core and valve body hole, such as roundness and cylindrical degree within 0.003mm, and generally there will be no hydraulic clamping phenomenon when reaching this accuracy;

2. The 400-ton hydraulic press opens several proper pressure balancing grooves on the surface of the valve core, and the electric pressure grooves and the outer circle of the valve core ensure concentricity. The small end of the cone shoulder is adopted towards the high-pressure zone, the kidney valve core is in the radial alignment in the valve hole;

3, if there are conditions, make the valve core or valve body hole do axial or circular square high frequency small amplitude vibration;

4. Carefully remove the Spurs on the side of the valve core convex shoulder and valve hole sinking and cutting groove tip to prevent the valve core outer circle and valve body inner hole from being damaged due to bumping;

5. Improve the cleanliness of the oil.

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