Causes of Slow Movement in the Hydraulic Cylinder of the 630-ton Hydraulic Press
**Causes of Slow Movement in the Hydraulic Cylinder of the 630-ton Hydraulic Press:**
1. **Uneven Friction in the Guiding Components Inside the Hydraulic Cylinder:**
- *Cause:* Uneven friction generating low-speed creeping. It is recommended to prioritize the use of metal as the guiding support. If non-metallic support rings are used, it is suggested to choose non-metallic support rings with good dimensional stability in the hydraulic oil, especially those with a low coefficient of thermal expansion. Additionally, strict control over the dimensional tolerance and uniformity of thickness is essential.
2. **Impact of Component Machining Accuracy:**
- *Cause:* Issues with the machining accuracy of components. In the manufacturing process of the hydraulic cylinder in the 630-ton hydraulic press, precise control over the processing accuracy of the cylinder's inner wall and piston rod surface, especially geometric accuracy, with a focus on straightness, is crucial.
3. **Low-Speed Creeping Due to Air Ingress in the Hydraulic Cylinder:**
- *Cause:* Ingress of air into the hydraulic cylinder causing low-speed creeping. This situation can be addressed by repeatedly running the hydraulic cylinder to achieve air exhaust. If necessary, install exhaust devices in the pipeline or both chambers of the hydraulic cylinder, especially during the operation of the four-column hydraulic press hydraulic system.
4. **Improper Design Clearances in the Hydraulic Cylinder of the 630-ton Hydraulic Press:**
- *Cause:* Low-speed creeping due to improper design clearances. It is crucial to correctly design the sliding fit clearances between the piston and cylinder body, piston rod, and guide bushing inside the hydraulic cylinder.
5. **Low-Speed Creeping in the Hydraulic Cylinder of the 630-ton Hydraulic Press Due to Seal Material Issues:**
- *Cause:* Seal material issues. It is recommended, under permissible conditions, to prioritize the use of combination seals with polytetrafluoroethylene (PTFE) as the sealing material.