Generally, the general failure forms of extruder parts mainly include the following:

1. Overall fracture

When parts are subjected to external loads such as tension, compression, bending, shearing and torsion, fatigue fracture will occur in dangerous sections, such as the fracture of guide posts, the fracture of bolts, the fracture of the root of gear teeth and so on.

2. Excessive residual deformation

If the stress acting on the part exceeds the yield limit of the material, the part will produce residual deformation, such as bending of the rotating shaft and deformation of the gland.

3. Surface damage of parts (the main cause of failure of parts)

The surface damage of parts is mainly corrosion, wear and contact fatigue, which are the failure forms that occur gradually with the extension of working time, such as the wear of guide rail and the wear of copper sleeve.

4. Failure caused by damage to normal working conditions

For example, a sliding bearing with liquid friction can only work normally when there is a complete lubricating oil film; If these necessary conditions are destroyed, different types of failures will occur, such as overheating, gluing and wear of bearings, and slippage of belt drive.

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