Combined quenching die for deformation control of long web large face gear and heat treatment method

Abstract

The invention discloses a combined quenching die for deformation control of a long web large face gear. The combined quenching die comprises an upper die and a lower die, wherein the upper die comprises an outer pressure ring and an inner pressure ring, the outer pressure ring is used for applying pressure to a tooth part of a face gear part, the inner pressure ring is used for applying pressure to a spline end face of the part, the lower die comprises a base, and a lower supporting ring, a large supporting pad, a small supporting pad and a positioning mandrel, wherein the lower supporting ring, a large supporting pad, a small supporting pad and a positioning mandrel are positioned on the base, the lower supporting ring is located between the base and a web of the part and used for supporting the web, the large supporting pad comprises an inner supporting platform and an outer supporting platform, the outer supporting platform is used for supporting the tooth part of the part, the inner supporting platform is used for supporting a supporting part of the part, and the small supporting pad is located between the part lower end journal part and the base and used for supporting the part lower end journal part. According to the combined quenching die for the deformation control of the long web large face gear and the heat treatment method, the quenching deformation can be effectively controlled.

Description

technical field [0001] The invention relates to the field of gear heat treatment, in particular to a combined quenching mold for large face gears with long webs and a heat treatment method. Background technique [0002] 9310 steel is a low-carbon alloy steel, which is a low-hardenability steel. After carburizing and quenching, the surface can obtain high hardness, and has excellent strength and toughness. The face gear pair has the characteristics of large reduction ratio and high transmission power, and will be popularized and applied. Due to the poor hardenability of 9310 steel, the effective thickness of the parts cannot be too large during carburizing and quenching. When making large-scale face gears, the effective thickness must be less than 18mm. Large-scale face gears with long webs with specifications greater than Ф600 are due to structural stress during carburizing and quenching. Larger distortion will occur due to the influence of thermal stress, and the elastic r...

AI Technical Summary

Problems solved by technology

[0003] Due to the large size of the long web face gear, the mold design is difficult. Free quenching is generally used in the program-controlled heating furnace for quenching. However, the structure of this long web large face gear is complex, and there are many thin-walled structures. During quenching, the heating and cooling rates of the parts are inconsistent, forming a large thermal stress. At the same time, there is a structural transformation during carburizing, quenching heating, and cooling, forming structural stress. Under the joint action of thermal stress and the influence of the self-weight of the part, the deformation of the free-quenched part is large, the thin-walled hole has ellipse and taper, the angle of the face tooth and the web are deflected and there are distortions, and the upper part of the web after heating is strengthened The rib structure cannot be machined, and other deformations are also difficult to repair, which will cause the size to be out of tolerance or even scrap the parts

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