提高中型驱动后桥壳焊接接头疲劳寿命的方法  

Methods of improving the fatigue life of housing welded joint of middle-sized drive axle

作　　者：胡义华[1] 柳明 黄志超 卢拱华 张玉宽 HU Yihua;LIU Ming;HUANG Zhichao;LU Gonghua;Zhang Yukuan(Jiangxi Jiangling Chassis Co.,Ltd.,Fuzhou 344000,China;Key Laboratory for Conveyance and Equipment of the Ministry of Education,East China Jiaotong University,Nanc-hang 330013,China)

机构地区：[1]江西江铃底盘股份有限公司,江西抚州344000 [2]华东交通大学载运工具与装备教育部重点实验室,江西南昌330013

出　　处：《电焊机》2020年第8期106-109,I0008,共5页Electric Welding Machine

基　　金：江西省重点研发计划(20192BBEL50013,20181BBE50011)。

摘　　要：针对某中型驱动后桥壳总成发生垂直弯曲疲劳断裂的问题,分析了该中型驱动后桥壳总成在垂直弯曲交变载荷作用下Y型焊缝疲劳断裂的特征及原因。提出三种提高桥壳焊接疲劳寿命的方法:(1)变更设计方案,将三角板焊缝内移12.5 mm;(2)焊缝接头开坡口;(3)采用大熔深MAG焊恒熔深新工艺焊接Y型焊缝。通过上述方法保证了焊缝熔深以避免后桥壳总成Y型焊缝疲劳裂纹的产生,提高其疲劳寿命。In order to solve the housing fatigue fracture problem in a middle-sized drive axle under vertical bending loading condition,this paper analyzes the characteristics and causes of the Y-shaped joint fatigue fracture of the housing assembly bearing the vertical bending alternating load.Three methods are proposed to improve the fatigue life of housing welding:(1)change the design scheme,move the triangular plate weld inward by 12.5 mm;(2)groove the weld joint;(3)adopt the new constant penetration MAG welding process to weld the Y-shaped joint.The above three methods ensure the weld penetration to avoid the generation of Y-shaped joint fatigue crack of housing assembly and improve its fatigue life.

关 键 词：驱动后桥壳总成 数值模拟 疲劳寿命 大熔深焊接 

分 类 号：U466[机械工程—车辆工程]