关键词: 车身尺寸；虚拟制造；尺寸工程

Abstract: As competition in the automotive industry intensifies, vehicle development cycles are continuously shortened, while customers are paying increasing attention to exterior appearance and functional details. Dimensional matching accuracy directly affects vehicle gap and flush quality as well as the realization of related functions, and therefore serves as a critical foundation for ensuring vehicle appearance quality and performance in use. Traditional physical analysis and validation methods can no longer meet these requirements. This paper systematically elaborates the application approach of virtual manufacturing technology in automotive dimensional engineering. From the three levels of single parts, assemblies, and the whole vehicle, a full-process system for dimensional analysis and application based on virtual manufacturing is established. At the single-part level, the rationality of the reference point system (RPS) design is mainly analyzed. At the assembly level, deviations are predicted through full-process simulation of welding, hemming, and other manufacturing processes. At the whole-vehicle level, virtual matching technology is used to identify matching risks in advance. Engineering practice in a vehicle project demonstrates that this system can effectively improve dimensional design quality and on-site ramp-up efficiency, thereby enabling front-loaded control of dimensional quality.

Key words: vehicle body dimensions; virtual manufacturing; dimensional engineering