油缸马鞍形曲线焊缝自动焊工艺

拖拉机铲刀臂油缸有5条焊缝，其中油缸体和油管接头座之间的焊缝为一条马鞍形空间曲线焊缝，焊后要进行油压密封性检验，要求在16MPa的油压下无渗漏。过去采用手工电弧焊，焊接难度大，焊接质量难以保证，经常出现焊接渗漏现象。对于空间曲线焊缝的焊接，在工业发达国家已大量使用焊接机器人进行自动化焊接来保征焊接质量和提高生产效率。国内有采用机械靠模的办法，但调整复杂，灵活性差；利用工业计算机数控系统和机器人进行空间曲线自动焊接的装置也不断地被开发和应用。由于此油缸焊缝质量要求高、生产批量较大。因此迫切需要开发一种自动焊设备和工艺，以实现油缸的马鞍形焊缝和其它焊缝的自动焊。

Automatic Welding Process for the Saddle Curve Weld Seam on the Oil Cylinder

There is a piece of saddle curve weld seam on the oil cylinder that drives the shoveling arm of the tractor, for the big welding difficulty of manual welding, the welding quality could not be guaranteed. The three-dimensional numeric control system serves as the control core to develop the automatic welding facilities, then triaxial linkage of rotation of the oil cylinder, horizontal movement of the welding torch and vertical rotation of the welding torch could be realized, thus the welding torch could be controlled to accurately move along the saddle curve weld seam.