Abstract: In order to resolve the pain points of low efficiency and inconsistent torque in manual tightening of exhaust manifold nuts on engine assembly lines, this paper develops a fully automated tightening device integrated with a servo pitch-adjustable mechanism, a jacking mechanism, and a laser-based positioning system. By deploying a six-axis robot to drive dual tightening shafts for collaborative operation, high-precision positioning and synchronous tightening of the nuts are achieved, with a cycle time of 39 s per workstation. This solution fundamentally enhances the automation rate of engine assembly lines and eliminates operator-induced variations, providing a replicable technical pathway for automating similar fastening processes.

Key words: engine assembly; exhaust manifold nut; automatic tightening

摘要： 为解决发动机装配线排气歧管螺母人工拧紧效率低、扭矩一致性差的痛点，文章开发 了集成伺服变距机构、顶升机构与位置检测机构的全自动拧紧设备。通过六轴机器人驱动双 拧紧轴协同作业，实现排气歧管螺母的高精度定位与同步拧紧，单工位节拍为 39 s。从根本 上提升发动机装配产线的自动化率并消除人工操作波动性，为同类型紧固工艺的自动化升级 提供可复用的技术路径。

关键词: 发动机装配；排气歧管螺母；自动拧紧