Let's introduce the wear causes and preventive methods of machined parts in detail.
Some wear belongs to the category of normal wear, such as mutual friction between parts, wear caused by hard particles, fatigue wear of parts under long-term alternating load, corrosion of parts by chemicals, and changes in metallographic structure or matching properties on the surface of parts under high temperature conditions.
·For the mutual friction between parts, it is necessary to ensure that the parts have sufficient cleanliness and lubrication.
·For wear caused by hard particles, it is necessary to prevent parts from being exposed and ensure that parts are clean and covered.
·For the fatigue wear of parts caused by long-term alternating load, eliminating the gap and selecting appropriate lubricating grease can reduce the additional vibration of the system and improve the machining accuracy of parts.
·For the corrosion of parts by chemicals, harmful chemicals must be removed and the corrosion resistance of parts must be improved.
·For the change of metallographic structure or matching property on the surface of parts under high temperature, try to improve the working conditions, or use high temperature resistant and wear-resistant materials to make parts.
Abnormal wear includes wear caused by repair or manufacturing quality failing to meet the design requirements, wear caused by violation of operating procedures, and wear caused by improper transportation, loading and unloading, and storage. To prevent this kind of wear, we should strictly check the product quality, be familiar with the mechanical performance, operate carefully, master enough hoisting knowledge, and be careful in operation to avoid improper operation.
If the machine is overhauled, its service life may be shortened, which may be caused by the deformation of basic parts, the destruction of part balance, the failure to perform running in, and the low hardness of parts.
The deformation of basic parts will change the relative position of each part, so as to accelerate the wear of parts and shorten the service life of parts. Reasonable installation and adjustment can be adopted to prevent deformation. Balance failure of parts refers to the imbalance of parts rotating at high speed, which accelerates the damage of parts and shortens the service life of parts under the action of centrifugal force. Strict action balance test measures should be taken to prevent it. The replacement parts do not perform the running in of the mating surface, which will increase the wear, so the accessories must be run in. The repaired parts are improperly selected, the surface hardness is not up to standard, or the heat treatment is unqualified. Materials shall be selected according to requirements and reasonable heat treatment shall be carried out.