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Auto parts repair

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Repairing methods for worn parts can be divided into two categories: machining worn parts to restore the correct geometric shape and fit characteristics, and obtaining new geometric dimensions. Surfacing, spraying, electroplating and electroless plating are used to supplement the worn parts, or expanding (reducing) upsetting is used to increase (or reduce) the size of the worn parts, and then mechanical processing is carried out to restore the nominal size, geometry and surface roughness.

Repair of deformed parts can be done by pressure correction and flame straightening. The cracks and damages on the parts can be repaired by welding, brazing, bench work or bonding.

The worn parts are machined by repairing dimension method and inserting sleeve method to make them have correct geometry.

Repair dimension method is widely used in automobile repairing. In order to balance the service life of parts, repair dimension method is used in many parts, such as cylinder, piston, piston ring, piston pin, crankshaft and bearing, which have high wear rate and short service life.

In automobile use, some of them are only local wear or abrasion. When the structure and strength permit, the wear parts can be reduced (shaft) or enlarged (hole) to a certain size (usually 2-3 mm) and then embedded into a sleeve by interference fit method to restore the basic size of the repair process. Such as: cylinder liner, valve guide and all kinds of bushing.

Thanks for the help of Feilong Jiangli

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