1. Welding tooling simulation technology (1) Realize the overall process planning simulation of the welding line (introduction of product tree diagram, plant structure, tempo, fixture layout, process logistics, welding equipment, etc.). The balance analysis of the production capacity of the welding production line is carried out, and the process distribution of the product, the distribution of the welding points, the number of stations, the distribution of personnel, the degree of automation of the tooling, etc. are continuously optimized. (2) Realize the assembly sequence of the station, matching simulation of each station resource, timing analysis and simulation verification, and simulation verification of the welding tongs. (3) Realize ergonomic simulation, robot welding assembly process simulation, mechanism motion simulation, and establishment of 3D factory. We have visited FAW-Volkswagen Chengdu Third Factory before. The application of the digital system of the factory has penetrated all aspects of product development, process planning and production line design. In the virtual environment, we continuously analyze, verify and improve the design plan, making logistics, assembly and quality. Production capacity, etc. can be optimized in the digital factory, and only in the case of meeting the requirements can be built in the real factory. Significantly shortened production capacity formation time, improved manufacturing quality, and reduced cost of change. 2. IRW Engineering Technology The IRW project (llltelli-gentResistaneeWeldingprogram) is called the intelligent resistance welding project, including monitoring, judgment and control systems. IRw not only conducts in-depth research on the mechanism, process, equipment, quality monitoring and control system of resistance welding, but also makes specific research on the environment of the engineering site. From the point of view of controlling body error, Irw Engineering is the continuation and deepening of the “2mm†project. 3. Fusion technology of assembly and welding technology (1) Fixture: The finite element method is used to analyze the possible deformation of the part during the assembly process, and the optimal position of the positioning component is obtained by nonlinear optimization. (2) Weld joint design: Different joint design, the error of the welding equipment is different for the error of the fitting. The joint design is unreasonable and the deformation will still exceed the reasonable range. (3) Error analysis and control: controlling the overall error of the vehicle body requires error design. That is, the maximum allowable error value of each link in the assembly welding process of the entire vehicle body is controlled. There are three methods: a) statistical methods to analyze existing manufacturing processes, including stamping, assembly of components, assembly of components, analysis of assembly processes, etc.; b) Identify the main sources of error, ie identify key points of the problem. Reduce the deviation of the size of the car body to less than 2mm, reduce the dimensional deviation of the main assembly to less than 1.5mm; c) control the error, not only the reasonable distribution of design errors in the entire vehicle body manufacturing process, but also the assembly The process is optimized to achieve control error. (4) Error measurement technology: The control of vehicle body manufacturing error, the design of error distribution, the intermediate production link and the control of final manufacturing error all require effective error measurement technology. From the method, the simulated optical sensor is used to measure the measured position of the workpiece surface. Most parts of the car body are composed of stamping parts, and the accuracy and dimensional tolerance of the mold are directly related to the size error of the car body. Therefore, the error measurement technology is not limited to the measurement of parts, but also applied to the mold and tooling. The measurement of the fixture. (5) Welding: Generally speaking, the measurement of the mold is very cumbersome and time consuming. To a certain extent, it can be said that it is difficult for the processing and measuring personnel to accurately measure the surface of the mold. The general approach is to use a coordinate measuring machine to measure several points that are distributed over a predetermined grid. In order to improve the dimensional accuracy of stamping parts, the United States has done a lot of research on the rapid and accurate measurement of molds to develop a system that can be used for rapid measurement of molds and trial production parts. At present, research in this area has been better. Results. In order to reduce the manufacturing error caused by the welding process and improve the strength of the welded joint, in addition to the optimized process assembly design, fixture design, and optimized joint design to solve the problem of the quality of the vehicle body, another important aspect is to improve the welding process itself. The technical level. Resistance spot welding has been used in body construction for many years, and spot welding quality and its control have always been one of the research priorities. In addition to the application of group control and parameter expert system, the research on the growth mechanism and model of spot welding nugget, the mode and control of smart resistance welding, the electromechanical characteristics of resistance spot welding and the optimization design are studied in detail, aiming at the future development needs. . (6) Process monitoring and error reduction: In order to reduce the dimensional deviation of stamping parts, the United States has done a lot of research work on line measurement and process monitoring of stamping part dimensional deviation to build an online monitoring system for stamping parts. In order to further improve the quality of automotive body stamping parts, the American Automobile Body Manufacturing Association has launched a new research project "close to zero stamping technology." In order to reduce the manufacturing error of the vehicle body, the information management system of the vehicle body assembly process was developed, and the research on the reduction, qualitative, tolerance analysis and comprehensive aspects of the vehicle body manufacturing deviation was carried out. The statistical analysis technology of the information was used to analyze and analyze the vehicle body manufacturing. Source of error and give a reasonable solution. In the practical application of the car system production, good results have been achieved. Granular Activated Carbon,Wastewater Treatment,Water Filtration Coal-Based Activated Carbon,Activated Carbon Co., Ltd. , http://www.nbactivatedcarbon.com