Press quenching mold for locomotive traction gear ring

Abstract

The invention relates to the technical field of thermal treatment molds, in particular to a press quenching mold for a locomotive traction gear ring. The press quenching mold comprises an upper mold body and a lower mold body. The upper mold body comprises a web pressing mold body and an end face pressing mold body. The lower mold body comprises an expanding core, a web supporting table and an end face supporting table. The web supporting table and the web pressing mold body are used for clamping a web of the locomotive traction gear ring; the end face supporting table and the end face pressing mold body are used for clamping the end face of the locomotive traction gear ring; the expanding core comprises a stand column, a circular cone stand, an expander and an expander supporting table; the stand column and the expander supporting table are fixed to a machine tool working table; the circular cone stand is arranged on the stand column in a sleeved mode and can move up and down along the stand column; the expander is arranged around the periphery of the circular cone stand, the bottom of the expander makes contact with the expander supporting table and can perform radial movement on the expander supporting table; the inner inclined surface of the expander is attached to the outer conical surface of the circular cone stand. The press quenching mold for the locomotive traction gear ring is compact in structure and ingenious in design; during carburizing and quenching, the requirement of products for the hardness can be met and deformation of the gear ring due to carburizing and quenching can be effectively controlled; therefore, the qualified rate of the products is increased.

Description

technical field [0001] The invention relates to the technical field of heat treatment molds, in particular to a press-quenching mold for a traction ring gear of a locomotive. Background technique [0002] In order to obtain better anti-fatigue strength, carburizing and quenching is often used as the final heat treatment process for the traction ring gear of railway locomotives. In actual processing, the carburizing and quenching deformation of ring gears is relatively large, and common distortion types include ellipse, taper, and end face runout. The ring gear distortion leads to no allowance for subsequent processing, and the effective hardened layer depth of the teeth is uneven, which reduces product quality. . The reasons for ring gear deformation are more complicated, mainly including raw materials, part shape, machining volume, heating and cooling process, etc. These factors interact with each other, making it particularly difficult to control ring gear distortion. ...

AI Technical Summary

Problems solved by technology

In actual processing, the carburizing and quenching deformation of ring gears is relatively large, and common distortion types include ellipse, taper, and end face runout. The ring gear distortion leads to no allowance for subsequent processing, and the effective hardened layer depth of the teeth is uneven, which reduces product quality.

The reasons for the deformation of ring gears are more complicated, mainly including raw materials, parts shape, machining volume, heating and cooling processes, etc. These factors affect each other, making it particularly difficult to control ring gear distortion

[0003] In the prior art, there are few control methods for carburizing and quenching distortion of ring gears. The main method is to increase the machining allowance of the gear before carburizing and quenching. The machining allowance is closely related to the raw material and shape, and its control is difficult. It is easy to achieve the ideal allowance, but too large machining allowance will cause the hardness and strength of the tooth to decrease, and, because the root of the tooth is not ground, the excessive grinding of the tooth will cause the tooth root to form Grinding the boss, if the machining allowance is too small, the distortion of the ring gear cannot be reduced, and both of them will easily cause the product to be scrapped

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