基于PLC控制的回抽式无匙孔搅拌摩擦点焊系统

摘要

According to the spot welding process of back-pumping keyhole-free friction stir spot welding system,this system is designed by the combination of software and hardware.The design form of stir tool of pin and shoulder separation are presented by solving mechanical problem.At the same time,the electrical schematic diagram,the program flow chart,PLC main program instructions and HMI operation interface are given by using major components of PLC,HMI,servo m otor and current sensors.It is convenient,reliable and precise to achieve system control through the closed-loop control technology of PLC and servo motor,as well as real-time communication technology between PLC and MHI.This system has been successfully used in production and scientific research.And the results show that the system is stable and reliable.%回抽式无匙孔搅拌摩擦点焊系统根据其点焊工艺,采用软硬件相结合的方式进行系统设计.通过设计针肩分离式搅拌头解决机构问题,给出了搅拌头的设计形式,同时采用PLC、HMI、伺服电机和电流传感器等主要器件,介绍了电气原理、程序流程、PLC主要程序指令和HMI操作界面.通过PLC与伺服电机的闲环控制技术,以及PLC与MHI实时通讯技术实现了对该系统方便、可靠、精密的控制.目前,该系统已成功获得生产和科研应用,运行结果表明该系统运行稳定、可靠,效果良好.