Induction heating device for cutter shaft quenching

Abstract

The invention belongs to quenching equipment, and in particular, relates to an induction heating device for quenching a surface of a cutter shaft provided with a key slot. The induction heating device for quenching the cutter shaft comprises a hollow bearing body, wherein an induction coil is arranged in the bearing body. The induction heating device is characterized in that a bending part is arranged on the bearing body; and a magnetizer is arranged on the surface of one side, near a workpiece, of the bending part. The invention provides the induction heating device which can adjust a gap between the bending part and the workpiece and is provided with the magnetizer on one side surface, near the workpiece, of the bending part.

Description

technical field [0001] The invention belongs to quenching equipment, in particular to an induction heating device for surface quenching of a cutter shaft provided with key grooves. Background technique [0002] The material of the cutter shaft is usually 42CrMo. The surface requires high wear resistance and high hardness. The hardness needs to reach 55HRC. There is a keyway on the shaft body, and a solid copper bar is usually embedded in the keyway, and the width of the outer surface of the copper bar is slightly larger than the width of the notch to shield the induced current. However, in the prior art, the machined copper bar is manually The bar is embedded in the keyway by knocking, it is difficult to achieve a tight fit, and the fit with the circular keyway is even worse, and because the copper bar is heated and expanded during the quenching process, it is easy to be squeezed out of the keyway. The protective effect is still very easy to cause quenching cracks. Last yea...

AI Technical Summary

Problems solved by technology

[0002] The material of the cutter shaft is usually 42CrMo. The surface requires high wear resistance and high hardness. The hardness needs to reach 55HRC. There is a keyway on the shaft body, and a solid copper bar is usually embedded in the keyway, and the width of the outer surface of the copper bar is slightly larger than the width of the notch to shield the induced current. However, in the prior art, the machined copper bar is manually The bar is embedded in the keyway by knocking, it is difficult to achieve a tight fit, and the fit with the circular keyway is even worse, and because the copper bar is heated and expanded during the quenching process, it is easy to be squeezed out of the keyway. The protective effect is still very easy to cause quenching cracks. Last year, the company’s cutter shaft quenching scrap rate was as high as 30%, which seriously affected the production cost and production efficiency.

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