The Study Of The Special Welding Machines Using In The Automobile Bridge

The welding process is one of the most representative three important technologies in the automobile technique of manufacture (welding, paint, general equipment department). Chinese automobile industry has passed through 50 years development, in the past 50 years, the Chinese automobile industry grew out of nothing, moved towards the internationalization gradually, the automobile welding technology also gradually approaches the international advanced level. It is economical to use welding special machine in the part welding which has strong specialization and has regular weld bead spare and can satisfy the welding technology the request. Recently, the special welding machine has obtained the massive applications in our country automobile industry. Every year near thousands welding special machine has been used in the automobile production. Besides the automobile assembly plant has used many weld the special machines, in the automobile spare part factory also had the massive applications.The design is designed to be welded to the rear axle vehicle design, including two sets of equipment for the two kinds of seams. Each equipment including mechanical structure and electrical control system was designed. Bridge welding automobile carbon dioxide gas was used in welding method for welding, 300-500mm/min welding speed. To meet the requirements, this needs blowtorches move up and down, cards bear the workpiece. When welding straight seams, moving blowtorches is requested to complete mobile welding process. While welding circle seams call for a special plane in the central workpiece rotation so that the entire welding process.The mechanical structure design of special welding machine using for straight seams includes bed, welding tractor, gear train, tooling fixture, as well. The contents involve the choose and positioning of air cylinders, motor drives, redactors, core clampers, ball screws, and so on. The welding tractor which is the key, according to the requirements of the technology, is designed to be the motion organization with two blowtorches, and make welding purpose complete in an operation.The mechanical structure design of circle seam special welding machine be similar with that of link directly special welding machine, the difference is that circle seam special welding machine is requested workpieces rotating. In other words, the positions of the welding seam are rotated, and blowtorches are keep immobility, to complete the entire process. So the design of pneumatic chuck is the key to the equipment. After grasps workpiece, pneumatic chuck is driven by the rotating motor and rotates the workpiece, completion of the welding seam.In the design of electrical control system, using as the core of SIMENS S7-224, the use of electromagnetic valves and relays and other components to complete welding machine control. Due to the welding process, it is needed to adjust the speed of welding; the topics choose Ktl6P module to control welding speed. In the special welding machine using for straight seams, position switches are used to control the termination of seams position. While in the special welding machine using for circle seams, hall switch component is used to control the termination of seams position by measure circum angle. That whether the electromagnetic valves are charge controls other movements.