Study On The Automatic Production Line Of Angle-inserting Resistance Spot Welding

Along with the global energy crisis,more and more attention have given to the energy utilization. As an important part of building energy saving,energy saving walls received extensive attention. Polystyrene steel wire mesh frame of exterior insulation materials which have good insulation performance,easy to decorate, simple and quick construction ,remarkable energy-saving,is widely promoted as one of the building wall insulation materials. Because the present equipment existing backward technology, single control, unreasonable equipment structure, low production efficiency, high leakage welding rate problems, which lead to the products can not meet market demand.Based on the extansive investigation and research,this thesis analyzed and studied the current resistance spot welding machine for polystyrene steel wire mesh frame.New automatic angle-inserting resistance spot welding machinc which is made up of pull unit,straightening uint, sheets-feeder unit,sheet cutting unit and welding unit is researched and designed. The equipment is developed by using the modular design method. Each modules have gotten independent drive system, so every function modules can work as prescribed technics procedure, then cooperate and accomplish the predetermined function.The structure of mechanical is greatly simplified.Secondly,an invremental and coupled thermal-electro-mechanical finite element model is presented for predicting temperture distribution.By providing the necessary information and boundary conditions,simulations were preformed for different stages of welding cycle.The results provide information on the development of the weld nugget and thus predict the welding quality prior to the actual welding process.The input parameters to the model can bu adjusted to give differert size of the weld nugget.As a result ,optimum setting of the welding parameters for the desired quality and different materials of the workpiece can be obtanined through simulations,without performing large number of physical experiments.Finally, the necessity of the product quality control is discussed in this paper.The reasons of quality problem have been researed and analyed from the production technology, raw material, production equipment ,then a scheme of controlling quality is propounded.