The occurrence of wear during machining is a common phenomenon in production. The reason may be due to various factors such as the material of the workpiece, the environment, and the processing method. Mechanical wear can adversely affect the processing quality, processing accuracy and processing efficiency of the product. Therefore, it is very important to do a good job of preventing mechanical wear. Below, we will specifically introduce the causes of wear of machined parts and their prevention methods.
Some wear is a category of normal wear and tear, such as mutual friction between parts, wear caused by hard particles, fatigue wear of parts under long-term alternating load, corrosion of parts by chemical substances, and metallographic changes of surface of parts under high temperature conditions.
- For the mutual friction between parts, ensure that the parts have sufficient cleaning and lubrication.
- For wear caused by hard particles, it is necessary to prevent the parts from being exposed and to ensure a clean cover between the parts.
- For the fatigue wear of parts under long-term alternating load, eliminate the gap, choose the appropriate grease, it can reduce the additional vibration of the system and improve the machining accuracy of the parts.
- For chemical substances to corrode parts, it is necessary to remove harmful chemicals and improve the corrosion resistance of parts.
- For changes in the metallographic structure or the matching properties of the surface of the part under high temperature conditions, efforts should be made to improve the working conditions, or to use high temperature and wear resistant materials to make parts.
Abnormal wear and tear, including repair or manufacturing quality, does not meet the wear and tear caused by design requirements, wear and tear caused by violation of operating procedures, and wear caused by improper handling, handling, and storage. To prevent such wear, you should strictly check the quality of the product, be familiar with the mechanical properties, carefully operate, and have sufficient lifting knowledge to be cautious in the operation to avoid improper operation.
If the machine is overhauled, the life may be shortened, which may be caused by deformation of the base part, damage to the part balance, no running-in and low hardness of the part.
Deformation of the base part changes the relative position of each part, thereby accelerating part wear and shortening the life of the part. Reasonable installation and adjustment can be taken to prevent deformation. Part balance failure refers to the unbalanced parts rotating at high speed, which accelerates the damage of parts under the action of centrifugal force and shortens the life of parts. Strictly performing dynamic balance test measures should be taken to prevent it. If the replaced part does not perform the running-in of the mating surface, the wear amount will increase, so the fitting must be worn-in. The repaired parts are not properly selected, the surface hardness is not up to standard, or the heat treatment is unqualified. Materials should be selected as required and properly heat treated.