The Research Of Car Body Welding Accuracy

Body accuracy can reflect the level of automobile manufacturing enterprises, and it is the quality base of the automobile brands compete in the market. On the load type of the car body, interior parts, exterior parts, engine systems, control systems, transmission systems, suspension systems and other components are installed in the car body, the body accuracy decided the production effect of auto companies, product performance, manufacturing hours, and manufacturing costs. The vehicle body is completed by thousands of stamping parts through using welding jigs, and welding methods. Car body's welding accuracy in the process of body welding is an important factor of the body precision. According to the study of the body welding precision, We hope that we can find a way to improve the accuracy of body welding, and the accuracy of the body, helping domestic automobile manufacturers to enhance the "Made in China" level.This text connects an actual business projects with a processing of a certain domestic car for the study, analyzed the body accuracy factors, focuses on the impact factors of the body welding; and according to the study of body welding process, we find that the development process of vehicle body welding is divided into two stages:the development of welding technology and welding fixture. We study the development block in the vehicle body welding process, parts of the assembly sequence, the arrangement of spot position, fixture positioning system layout, detailed design of fixture, and fixtures use and management of the need to comply with the technical requirements phase; Finally, the models use the appropriate method, and get better results.The main thesis of the study includes:①tamping→low level assembly→middle level assembly→High-level assembly→body shell sub-assembly manufacturing process of assembly, product design, stamping process, body welding process, product quality inspection system, on-site operating a total of five aspects of the body accuracy. Which in the body welding process, the difference from the vehicle identification block, assembly sequence differences between solder joint layout, fixture positioning system layout differences, differences in the detailed design of fixtures and so on can affect the body welding accuracy.②Body welding process as a systems engineering, and refined into the body of the welding block, parts of the assembly sequence design, solder joint layout design, fixture positioning system design, detailed design of fixture, fixture manufacturing, fixture inspection, welding site use various stages of the technology developed methods and the various stages for the next phase of the technical constraints.③Welding technology needs a clear position from the base, clear precision welding block, the work piece assembly sequence, the location of solder joint arrangement has done work in the product structure to ensure the realization of the premise, to improve the connection between the various pieces of size accuracy, control the body in the assembly, welding the various parts of the deformation method, and ultimately improve the precision of the body welding.④Welding fixture needs to body welding process and product quality standards as the yardstick to complete the fixture layout and implementation of the relevant methods, note the location of anchor points uniform, consistent, reliable structural strength to ensure the accuracy of the work piece size of the connection.In the development of a car body welding process, the implementation of this method results show that:the car body accuracy and the rate of qualified product are all increase obviously than before,improve manufacturing effectiveness, while reducing the vehicle's operation time and the residence time of the vehicle, reduce manufacturing costs and enhance efficiency.The results of this study for the development of body welding has a great value and practical significance.