Supersonic frequency quenching process for roller path of hub bearing assembly

Abstract

The invention discloses a supersonic frequency quenching process for a roller path of a hub bearing assembly, comprising the following steps: placing a hub bearing assembly workpiece in a locating device, well regulating the positions of the workpiece to be quenched and a sensor, keeping the sensor static, keeping the workpiece to rotate continuously, carrying out continuous supersonic frequency heating on the roller path quenching area of the upper roller path of the hub bearing assembly, and spraying polyvinyl alcohol water solution for cooling; and after the upper roller path quenching carried out on the upper roller path of the hub bearing assembly is finished, changing another locating device, and carrying out upper roller path quenching and lower roller path quenching on the upper roller path of the hub bearing assembly, wherein the lower roller path quenching process and the upper roller path quenching process are the same. The hardenability layer depths of the upper roller path and the lower roller path are within 2.0-3.5mm, the outer diameter deflection of the quenching areas is 0.05mm, the surface hardness reaches more than HRC 64, and the comprehensive physical property of the quenched workpiece is high. The invention has simple and convenient operation and easy implementation, can realize mass production, has stable quality and is beneficial to follow-up procedures and processing; and the work noise is less than 80dB, thus well improving the work environment.

Description

technical field [0001] The invention relates to a quenching process, in particular to a supersonic frequency quenching process for the raceway of a hub bearing assembly. Background technique [0002] The heat treatment process adopted by the raceway of the general hub bearing assembly is that the sensor is adjusted to the position and remains still, the workpiece rises to the quenching position, the workpiece rotates continuously, and after heating, the coolant is sprayed for quenching. After the upper raceway of the hub bearing assembly is quenched, use another positioning device to quench the lower raceway of the hub bearing assembly. The frequency of the intermediate frequency power supply is 6000-8000Hz, the power is 80-100KW, the material is 65Mn, the hardness is required to be above HRC61, the quenched hard layer is required to be 1.8-4mm, and the heating temperature reaches 850-900°C. The deformation of the outer diameter of the quenching position is above 0.2mm. ...

AI Technical Summary

Problems solved by technology

[0003] When the above process is in use, because the hardness is not easy to meet the requirements, it is unstable

The deformation in the quenching area is more than 0.2mm, and the subsequent machining allowance is large, which increases the difficulty of grinding

The noise produced during grinding is above 110 decibels, seriously polluting the environment and endangering the physical and mental health of operators

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