预处理不合格对工件变形的影响

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摘要：针对某低碳合金钢齿轮渗碳淬火后因齿轮平面扭曲变形大而报废的现象，通过变形检测，对热处理工装、毛坯原材料及正火工艺等影响因素进行分析，表明正火预处理不合格是造成齿轮变形的重要原因。阐述了等温正火预处理对防止齿轮热处理变形所具有重要的作用。

关键词：渗碳淬火；贝氏体；变形；混晶；二次正火

The influence of pre-treatment mixed crystal on workpiece deformation

HAO Fenglin1， ZHONG Xing2， LIU Tao3， WANG Zhengqi3， JI Shichao3， ZHANG Xiping3

1. Zhejiang Shuanghuan Driveline Co.， Ltd.， Hangzhou 311100， Zhejiang， China

2. Jiangsu Shuanghuan Driveline Co.， Ltd.， Huaian 223200， Jiangsu， China

3. Qingdao Zhengrui Heat Treatment Co.， Ltd.， Qingdao 266109， Shandong， China

Abstract： In view of the phenomenon of scrap of a low carbon alloy steel gear due to large distortion of gear plane after carburizing and quenching， the influence factors such as heat treatment tooling， blank raw materials and normalizing process were analyzed through deformation detection. The results show that unqualified normalizing pretreatment is an important cause of gear deformation. The isothermal normalizing pretreatment plays an important role in preventing the deformation of gear during heat treatment.

Keywords： carburization quenching; bainitic; deformation; mixed crystal; secondary normalization

1 序言

浙江双环传动机械股份有限公司是一家专业生产汽车齿轮、摩托车齿轮、电动工具齿轮及工程机械齿轮的企业。（剩余2553字）