车门外开手柄外壳断裂分析  

Failure Analysis of Automobile Door Handle Shell

作　　者：詹绍薇 任小云 徐磊 薛戬 Zhan Shaowei;Ren Xiaoyun;Xu Lei;Xue Jian(Zhejiang Yucheng Commercial Vehicles Group Co.,Ltd.,Hangzhou 310000)

机构地区：[1]浙江远程商用车研发有限公司,杭州310000

出　　处：《汽车工艺与材料》2024年第5期59-63,共5页Automobile Technology & Material

摘　　要：对断裂车门外开手柄外壳进行了材料一致性与力学性能分析、断口形貌分析、结构分析、应力分析、失效模拟,发现材料一致性和力学性能均符合设计要求,该零部件在远离注塑进料胶口且壁厚较薄的尖端容易发生应力断裂。通过将外壳与骨架间隙由0.2 mm增加到1.2 mm、外手柄尖端转角由直角链接改为斜面和圆弧过渡、工艺设计上改变模具进料胶口位置、固定模具温度为50~60℃、注塑前的烘料干燥时间由1 h增加到2 h、注塑后增加80℃/1 h烘烤去应力工艺、保压时间从7 s缩短为4 s,能够降低应力,解决外开手柄断裂问题。对优化设计后的零部件进行验证与跟踪,未再出现类似失效情况。Based on the material consistency and mechanical properties,fracture morphology analysis,structure analysis,stress analysis,failure simulation,broken door handle shell material consistency and mechanical properties met the design requirements,it was found that the parts away from the tip of the modeling of gate structure was prone to stress fracture.Clearance between shell and skeleton was increased from 0.2 mm to 1.2 mm,handle tip comer with rectangular links was changed to bevel and circular arc transition,the position of mold feeding mouth was changed,temperature of the mold was fixed at 50~60℃,the drying time of baking material before injection was increased from 1 h to 2 h,the baking stress relief of 80℃for an hour was increased after injection,and the pressure holding time was reduced from 7 s to 4 s,the stress could be reduced which eliminated handle fracture.After the rectification,the parts were verified and tracked,and no similar failure occurred again.

关 键 词：车门外开手柄 非金属材料 失效分析 应力开裂 模具胶口 

分 类 号：U463.61[机械工程—车辆工程]