螺旋弹簧失效分析与改进  

Failure Analysis and Improvement of Spiral Spring

作　　者：陈成奎 邵亮 佟国栋 刘柯军 张炜 李润哲 Chen Chengkui;Shao Liang;Tong Guodong;Liu Kejun;Zhang Wei;Li Runzhe(Global R&D Center,China FAW Corporation,Ltd.,Changchun 130011)

机构地区：[1]中国第一汽车集团有限公司研发总院,长春130011

出　　处：《汽车工艺与材料》2023年第11期63-66,共4页Automobile Technology & Material

摘　　要：通过对螺旋弹簧耐久试验断裂件断口分析,确定断裂起源于表面脱碳层,并进一步从表面微观结构和疲劳裂纹萌生的方面分析表面全脱碳层对弹簧寿命危害性,得出螺旋弹簧表面全脱碳是早期断裂的主要原因。通过改进螺旋弹簧热处理工艺解决了表面脱碳问题,对改进后的螺旋弹簧再次进行耐久试验,改进后螺旋弹簧的寿命大幅提高,耐久试验次数从改进前不能满足技术要求,到改进后试验次数超过技术要求的2倍。Based on the fracture analysis of the screw spring fracture in durability test,the paper determined that the fracture originated from the surface decarburization layer and further analyzed the harmfulness of the surface decarburization layer on the spring life from the perspective of surface microstructure and fatigue crack initiation,the paper concluded that the surface decarburization was the main cause for the early spring fracture.The problem of surface decarburization was solved by improving the heat treatment technology of spiral spring.The durability test of the improved spiral spring was carried out again.The life of the improved spiral spring was greatly improved,the durability test number was increased from failing to meet the technical requirements before the improvement to exceeding 2 times of the technical requirements before the improvement without breaking.

关 键 词：螺旋弹簧 铁素体 表面脱碳 

分 类 号：U463.334.1[机械工程—车辆工程]