Deformation repair lapping bar and deformation repair method for shaft hole

Abstract

A deformation repair lapping bar for a shaft hole comprises a bar body, as well as a front handle and a rear handle which are respectively fixed with the two ends of the bar body, wherein spiral groove lines used for accommodating a grinding paste are arranged on the bar body and comprise a forward spiral groove and a reverse spiral groove. According to the invention, the groove shape with angles can increase kneading between the grinding paste and the inner wall of the shaft hole, so that the function of the grinding paste can be given into full play and the grinding efficiency and precision are improved. The invention further provides a deformation repair method for a shaft hole.

Description

technical field [0001] The invention relates to the field of automobile manufacturing, in particular to a grinding rod for repairing deformation of a crankshaft hole of an automobile engine and a repair method. Background technique [0002] Cases of design changes often occur in the process of engine R&D projects, some of which are changes in the tightening torque of locking bolts. Design changes in the tightening torque of engine block tile cover bolts will cause slight deformation of the crankshaft hole, while the crankshaft hole It is the core part of the engine block, and its size tolerance, shape tolerance and other parameters are extremely strict. Even a small amount of deformation will cause extreme changes in the tolerance parameters of the crankshaft hole, and the out-of-tolerance of the cylindricity will directly cause the entire block scrapped. [0003] When the crankshaft hole is deformed, if it is repaired by machining or honing, it is necessary to repeat the p...

AI Technical Summary

Problems solved by technology

[0002] Cases of design changes often occur in the process of engine R&D projects, some of which are changes in the tightening torque of locking bolts. Design changes in the tightening torque of engine block tile cover bolts will cause slight deformation of the crankshaft hole, while the crankshaft hole It is the core part of the engine block, and its dimensional tolerance, shape tolerance and other parameters are extremely strict. Even a small amount of deformation will cause extreme changes in the tolerance parameters of the crankshaft hole, and the excess of cylindricity will directly cause the entire cylinder block scrapping

[0003] When the crankshaft hole is deformed, if it is repaired by machining or honing, it is necessary to repeat the positioning of the repaired workpiece, and the error caused by this repeated positioning will directly affect the final repair result, often failing to achieve the repair effect even damage the workpiece

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