The machine tool spindle is an important part of the cutting machine tool. It bears various forms of load when transmitting power and performs high-speed rotation during work. The working environment of the machine tool spindle is very harsh, so we have relatively high requirements for the spindle. In order to meet the work requirements, we often use medium frequency induction heating machines to heat treat the spindle. Today, the editor will take the M1432 grinder spindle as an example to briefly talk about the medium-frequency heat treatment process.
The commonly used material for M1432 grinder spindle is 38CrMoA1A steel, which requires quenching hardness ≥950HV, quenching depth ≥3mm, and distortion requirements of radial circular runout ≤0.05mm. In order to meet this requirement, we commonly use medium frequency induction heating machines for heat treatment. The specific process is as follows:
1. Conditioning and tempering treatment. The purpose of quenching and tempering is to ensure that the overall spindle has good comprehensive mechanical properties. The process is usually carried out by a medium-frequency induction heating machine with a heating temperature of 940°C, oil quenching, and then high-temperature tempering heat treatment of 350-690°C.
2. Stress relief annealing treatment. Its purpose is mainly to eliminate the residual internal stress caused by semi-finishing machining and prevent the workpiece from deforming. The heating temperature is usually 610°C.
This article takes the M1432 grinder spindle as an example to briefly introduce the medium-frequency heat treatment process. If you have relevant needs, please feel free to leave us a message.