The main shaft is an important component of the generator or motor, which mainly transmits power to other parts. When working, the main shaft needs to bear various pressures such as bending, torsion and impact. So this requires the spindle to have sufficient rigidity, strength, fatigue resistance, high wear resistance or stability and other properties.
The manufacturing process of a lathe spindle includes forging, preliminary heat treatment, machining, heat treatment and other parts. The heat treatment equipment we often use is high-frequency induction heating equipment. First, the axle must be forged into a billet, and the residual temperature after forging is used to normalize the axle, and then it is cooled in the air. It is then simply machined to eliminate edging. Finally, it is quenched and tempered. Due to the relatively large length of the lathe spindle, it is easy to deform during quenching, but we only partially quench it, so this problem is largely avoided. Before quenching, all the screw holes and pin holes of the main shaft should be blocked with screws or asbestos, and then placed in an environment of 820-840°C for about 20 minutes, then water-cooled immediately after heating, and then placed in an oil tank for 10 seconds to continue cooling. The final tempering treatment eliminates the carbides produced in the inner structure of the lathe axle, further enhancing the hardness of the axle.
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