Laser-induced wheel pair surface strengthening and finishing processing method

Abstract

The invention discloses a laser-induced wheel pair surface strengthening and finishing processing method so as to solve the problems of small microhardness, poor wear resistance, large surface roughness, long production period and severe environment pollution and the like in a conventional wheel pair manufacture process. The method comprises the following steps: 1) the wheel pair surface strengthening step: mixed powders formed by TiO2, formamide and carbon black are input with nitrogen and acetylene and the mixed powders are blown; laser beams slantly radiate the mixed powders and the nitrogen; and a wheel is rotatably arranged in the nitrogen and acetylene gas atmosphere, and Ti (C, N) is generated on a wheel pair metal surface through in-situ composite; and 2) the wheel pair finishing processing step: a neutral electrolyte is input between the wheel obtained after the laser-induced strengthening and a cathode, a clamp plate clamps the wheel to rotate, and the cathode carries out feed movement simultaneously, and finishing process is carried out on the surface of the wheel pair through the pulse electrochemical technology. The method enhances wheel pair hardness, improves surface wear resistance, reduces surface roughness and improves fatigue life.

Description

technical field [0001] The invention relates to a method for strengthening the surface of a laser-induced wheel set, and also relates to a method for combining laser-induced surface strengthening with pulse electrochemical precision finishing. Background technique [0002] Usually the wheel set is rotating and rolling, and bears the full weight of the vehicle, so it is prone to wear and tear during operation. The manufacturing process of a conventional wheel set is: wheel blank forging→rough turning outer circle→finishing outer circle and inner hole diameter→intermediate frequency quenching, tempering blanking→repairing center hole→grinding outer circle→milling keyway. Although heat treatment can change the structure and properties of materials, it is easy to cause slight plastic deformation. Intermediate frequency quenching and tempering are difficult to improve the microhardness and wear resistance of the wheel set. Coarse grinding, semi-finishing, and fine grinding are ...

AI Technical Summary

Problems solved by technology

Although heat treatment can change the structure and properties of materials, it is easy to cause slight plastic deformation

Intermediate frequency quenching and tempering are difficult to improve the microhardness and wear resistance of the wheel set

Coarse grinding, semi-finishing, and fine grinding are the most common processing procedures for grinding wheel sets. Due to the high grinding speed and high instantaneous temperature in the grinding area during fine grinding, surface burns and grinding cracks are prone to occur, so it is very difficult to It is difficult to ensure that the outer circle of the wheel is ground to a very low surface roughness. If the surface roughness of the wheel set is large, the stress concentration will be strong, which will greatly reduce the fatigue strength of the wheel set

In addition, due to the large amount of grinding work, a large amount of oil mist or water mist will be generated during the grinding process, which will pollute the environment and cause damage to the health of workers

Therefore, the above process has problems such as low microhardness of the wheel set, poor wear resistance, large surface roughness, long production cycle, and serious environmental pollution.

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