In the use of the workpiece during heat treatment, vacuum quenching furnace problem of distortion of work piece is one straight people have a difficult problem. Below us ChengLong vacuum furnace with bearing ring as an example to analyze one of workpiece in vacuum quenching furnace causes of deformation and is mainly influenced by what factors.
Bearing ring in vacuum quenching furnace quenching swell phenomenon happens, this is mainly due to the quenching of pearlite and martensite after quenching, heat tolerance. Steel heat treatment in addition to the organization transformation, but also produce thermal stress and organization stress, if the instantaneous stress exceeds the yield strength to organise it could cause the plastic deformation of workpiece, change the actual expansion. In addition, the existence of residual austenite and the advent of martensite is also easily effect a lot. After quenching in vacuum quenching furnace formed by the organization and content of various components in the residual stress is to determine the size of the bearing steel quenching, tempering the size change of the main factors.

In addition, in the vacuum quenching furnace quenching, when the temperature of the quenching oil, austenitizing temperature, type of cooling medium, whether to use the conditions such as stirring, the shape of the sample may also affect the workpiece deformation, therefore in the process of production will need to check carefully and pay attention to the details of each link, to ensure that the manufactured products with market competitiveness.