优化滚边工艺提升车门区域尺寸匹配精度的方法研究

Dimensional Accuracy on Matching Areas of Vehicle Doors by Optimizing Hemming Process

目的研究滚边工艺参数对车门包边缩进量的影响,提升轿车车门区域的尺寸匹配精度。方法通过建立滚边压入角、TCP-RTP距离与车门包边缩进量的数学模型,得出了不同滚边压入角、TCP-RTP距离与包边缩进量的相互关系,提出了优化滚边工艺参数补偿车门钣金在冲压、焊接过程中的尺寸偏差的方法。在此基础上,结合改善某车型右后门与侧围间隙平行差的实例,计算了后门滚边压入角、TCP-RTP距离对应的包边缩进量,并与实际结果进行对比分析。结果滚边压入角θ越大,滚边后板件缩进量越大;TCP-RTP距离越大,滚边缩进量越小。结论提出的优化滚边压入角或TCP-RTP来实现板件滚边缩进量增大或减小的方法,能够在不更改模具的基础上提升车门外观匹配区域的质量。

The paper aims to study the influences of hemming parameters on dimensional variation of door to improve the matching accuracy of the vehicle doors. By setting up a mathematics model for the door roll in variation, hemming angle and TCP-RTP distance, the relationship among hemming angle, TCP-RTP distance and roll in variation was attained. And a method of improving the door dimensional accuracy to compensate the variation of the pressing and welding process was proposed. After that, in combination with an example of solving the gap parallelism between the rear door and the side panel, the roll in variation of the hemming angle and TCP-RTP distance was calculated and compared with the actual result. The roll in variation was enlarged with the increase of the hemming angle θ and decreased with the increase of the TCP-RTP distance. By optimizing the hemming angle and TCP-RTP distance to increase or decrease the roll in variation, the dimensional quality of vehicle door matching area can be improved without die modification.