Research BIW Welding Assembly Process Control During Development Phase

This paper focuses on a new car in two stages of product design and prototype welding technology to improve the quality of body welding process control.Technology designed to speed up new product development, product design stage craft personnel involved. In the model Stage, analyze the model structure, process block and main section.The preparation of the initial process flow diagram, determine the manufacturing division of labor, production feasibility analysis, the investment cost of the production line budget and determine the production line manufacturing solutions. In product development Stage, engineering, product design department3D (2D) data, the feasibility of the production line, welding, quality analysis. Analysis of body structure, check the parts with the interference, rationality. Check the parts welded channel analysis part location space and welding space adequacy. Analysis of solder joint position, check multilayer welding. Projection welded parts, stud welding parts, plastic injection parts C02welding parts, focus location for process analysis. The analysis of the appearance of the body clearance, confirmed the appearance of the gap gradient developed is reasonable. Preparation of process flow diagram, reasonably determine the welding assembly sequence of components. Tolerance allocation, according to the design gives the appearance of the vehicle gap gradient tolerance value tolerance allocated to the sub-assembly of parts. Control the parts processing benchmarks and processing accuracy, and ensure product consistency between the components. Tolerance Allocation Table must also enacted comprehensive consideration of the mold manufacturing capability and manufacturing cost issues. Develop fixture benchmark accurate positioning of the body parts, reliable. Quality control in key parts of the body mass to ensure the dimensional accuracy of the vehicle body, ensure that products meet the design target.Mainly for the preparation of the production conditions at the trial production stage, the production of the part of the tooling like cars and trial production vehicles, SE analytical work and the welding fixture program in this process for authentication. Recommend corrective measures on the fixture problems exposed in the trial process, part quality problems. Fixture for accurate debugging, and improve the quality assurance of the production line. Quality cultivation of the key parts to ensure that the dimensional accuracy of the vehicle body. all the indicators meet the design goals, with mass production conditions.Control of the implementation process in the product development and trial stage, the body quality improved rapidly. Reduce development costs, and reduce the development cycle, so that the new models to the market as soon as possible to enhance Hafei Automobile market competitiveness.