行李箱盖扭杆弹簧断裂分析与改进  

Fracture Analysis and Rectification of Trunk Lid Torsion Bar Spring

作　　者：闵良 Min Liang(SAIC Motor Passenger Vehicle Company,Shanghai 201804)

机构地区：[1]上海汽车集团股份有限公司乘用车公司,上海201804

出　　处：《汽车工艺与材料》2024年第3期47-51,共5页Automobile Technology & Material

摘　　要：为了确定行李箱扭杆弹簧断裂机理和原因,对其断口形貌、成分、尺寸、材料强度、微观组织和残余应力进行检测,并结合背景信息进行综合分析。结果表明:行李箱盖扭杆弹簧由于材料强度高、回火不充分、残余应力大,从而在折弯应力集中处发生高强钢延迟开裂。基于开裂原因,从控制原材料强度和优化去应力回火工艺以降低残余应力2个方面进行改进,最终有效解决了行李箱扭杆弹簧延迟开裂失效问题。In order to determine the fracture mechanism and cause of the trunk lid torsion bar spring,the fracture morphology,composition,size,material strength,microstructure and residual stress were tested,and a comprehensive analysis was conducted in combination with background information.The results indicate that the torsion bar spring of the trunk lid experienced high-strength steel delayed cracking at the concentrated bending stress caused by high material strength,insufficient tempering,and high residual stress.Based on the cause of cracking,improvements were made from two aspects:controlling the strength of raw materials and optimizing the stress relief tempering process to reduce residual stress,and ultimately the delayed cracking failure of the luggage torsion bar spring was effectively solved.

关 键 词：扭杆弹簧 延迟开裂 残余应力 去应力回火 

分 类 号：U463.85[机械工程—车辆工程]