关键词: 侧围后轮罩；S7-1500PLC；HMI；PROFINET

Abstract: In the era of industry 4.0, the manufacturing mode of automobile is developing in the requirements of the automobile manufacturing process in the welding workshop, and effectively direction of lean and flexible. The vehicle welding process has also become precise and intelligent, and the product quality has been greatly improved. The welding process of automobile rear wheel cover is the first step of the side line welding process. In order to realize the automation of automobile manufacturing process and improve the precision of welding process, according to its process characteristics and the control requirements of welding operation in the workshop, the electric control system of automobile side rear wheel cover welding based on programmable logic controller (PLC) control is studied. The system takes Siemens S7-1500 as the control core, adopts the form of "master station+remote station", completes the signal transmission between PLC and upper computer and field equipment through Ethernet and PROFINET, and finally displays the system parameters and fault information on the human machine interface (HMI) human-computer interface in real time. Through the simulation verification, the fixture, robot, turntable and other equipment can act according to the preset parameters, and the interlocking function is normal. The electric control system for the welding of the side wall rear wheel housing meets the welding control requirements of the automobile manufacturing process in the welding workshop, and effectively improves the production efficiency of the enterprise.

Key words: side wall rear wheel housing; S7-1500PLC; HMI; PROFINE