Shaft part with surface local quenching transition area and machining process

Abstract

The invention discloses a shaft part with a surface local quenching transition area. The shaft part comprises a conical cylinder surface; the surface local quenching transition area is designed as a conical cylinder surface; the strength of the shaft diameter of the surface local quenching transition area is improved along with enlargement of the conical cylinder surface; a large head of the conical cylinder surface belongs to the surface local quenching transition area; a small head of the conical cylinder surface belongs to a surface local quenching area; and the joint between the surface local quenching transition area and the surface local quenching area is designed at the middle part of the conical cylinder surface. The machining process enables all positions of a whole shaft of the shaft part with locally quenched surface to reach enough reliable strength, so that heat treatment cracks are not easy to generate, sudden drop of the strength cannot occur, and cracking and shaft breakage due to fatigue failure of the surface local quenching transition area are prevented.

Description

technical field [0001] The invention relates to the technical field of mechanical transmission, in particular to a shaft part provided with a local quenching transition zone on the surface and a machining process thereof. Background technique [0002] The shaft is a key mechanical part that supports the rotating parts and rotates with it to transmit motion, torque or bending moment. It plays a very important role in various mechanical transmissions, and its most critical working index is strength; after the shaft is quenched , can increase the rigidity and strength of the shaft, so that it is more durable and of higher quality. In order to facilitate processing and manufacturing, especially to reduce heat treatment deformation and processing costs, most shafts are designed to be partially quenched on the surface of the shaft section under heavy load, in order to improve the surface quality and fatigue strength of the shaft section, but In order to facilitate processing and ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a shaft part with a partial surface quenching transition zone and its machining process, to solve the problem that after the surface is partially quenched, due to the heat conduction near the surface quenching zone, the tempering effect will inevitably occur and reduce Hardness and strength, resulting in a sharp drop in strength, stress concentration, cracks and other problems will occur when the work is loaded, resulting in fatigue failure and cracking, broken shaft

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