Medium-deep-layer carburization or carbonitriding thermal processing technology for bearings or clutch parts

Abstract

The invention relates to a medium-deep-layer carburization or carbonitriding thermal processing technology for bearings or clutch parts. In the invention, the carburization or carbonitriding is carried on parts by utilizing a continuous production line of a carrier roller type mesh belt furnace with a controllable atmosphere, and the technology comprises the following steps in sequence: strong permeation, diffusion, quenching, cleaning, low-temperature tempering, discharging and air cooling. In the invention, the continuous production line of the carrier roller type mesh belt furnace with the controllable atmosphere is used for carrying out the medium-deep-layer carburization or carbonitriding, thus continuous production is realized, the production efficiency is improved, the productivity is increased, frequent opening and closing actions of a gap furnace can be reduced, non-oxidization treatment is realized, and the labor intensity is reduced; and in addition, carbon potentials in all areas of the mesh belt furnace are respectively controlled so as to guarantee the quality stability.

Description

technical field [0001] The invention relates to the technical field of heat treatment, in particular to a middle-deep carburizing or carbonitriding heat treatment process for bearing or clutch parts. Background technique [0002] Carburizing is a chemical heat treatment process in which the steel is heated and kept warm in a carburizing medium to increase the carbon content and a certain carbon concentration gradient on the surface of the steel so that carbon atoms can penetrate into the surface. Quenching and tempering after carburizing can improve the surface hardness and wear resistance of the parts, while the core has good toughness. Carbonitriding is a heat treatment process in which nitrogen and carbon are infiltrated into the surface of the workpiece, and nitriding is the main method. The infiltration layer has lower hardness and less brittleness. The main advantage is that the deformation of the workpiece is small, and it is not limited by the steel type. However,...

AI Technical Summary

Problems solved by technology

However, the carburizing layer of carbonitriding is relatively thin, so it is not suitable for bearing heavy loads.

[0003] The traditional carburizing or carbonitriding process uses a gap furnace for production. The gap furnace needs to be opened and closed frequently. The labor intensity of the workers is high, the production efficiency is low, and the quality is unstable.

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