Abstract: Torque is an important technological parameter in the process of automobile development and manufacturing, which has a great influence on the quality. During the tightening process of threaded fasteners, not only the final torque should be controlled, but also the torque and angle in the process should be monitored. Avoid the occurrence of qualified final torque, actually internal abnormalities, such as stuck, screw loose and other hidden dangers. By monitoring the torque and angle of the tightening process, the abnormal problems in the tightening process can be better found and the screw thread fastening quality can be further improved. The tightening result data was statistically analyzed, the tightening point of torque control method was statistically analyzed, and the monitoring range was set. Torque and angle control method is used to analyze torque statistics and set the monitoring range. Check and analyze the out-of-tolerance samples to find out the problem points and solve them, so as to improve the quality of thread connection.

Key words: Automobile manufacturing; Torque; Angle monitoring; Torque monitoring

摘要： 在汽车开发到制造过程中，扭矩是重要的工艺参数，对质量起到重大影响。螺纹紧固件在 拧紧过程中，不仅要控制最终的扭矩，其过程中的扭矩和角度也要进行监控，避免出现最终扭矩 合格，实际上内部出现异常，存在例如卡滞、滑牙等隐患。对拧紧过程的扭矩监控和角度监控， 能更好地发现拧紧过程的异常问题，进一步提升螺纹紧固质量。通过对拧紧结果数据进行统计分 析，扭矩控制法紧固点进行角度统计分析，设定监控范围。扭矩加转角控制法进行扭矩统计分析， 设定监控范围。对超差样本进行问题排查分析，找出问题点解决掉，真正提升螺纹连接质量。

关键词: 汽车制造；扭矩；角度监控；扭矩监控