基于工装预变形的高速列车侧墙尺寸偏差控制方法

Variation Control Method for the Sidewall of Highspeed Train Based on Fixture's Pre-variation

高速列车车体侧墙装配变形规律复杂,各种偏差源高度耦合,制造精度控制难度大。现利用工装预变形平衡生产过程中其他偏差源的影响,实现对侧墙尺寸偏差的控制。利用多元回归法建立了"工装预变形—尺寸偏差"定量关系模型,对模型的有效性进行了检验和分析,在此基础上,提出了基于工装预变形的侧墙尺寸偏差控制方法,并在某企业侧墙工段进行了工程应用,结果表明:该方法可操作性强,能有效地控制侧墙的尺寸偏差,提高侧墙制造质量。

Because of the complicated welding deformation rule and highly coupled error sources, the variation control of the sidewall of high- speed train is difficult in the actual assembly process. In this paper, a kind of new method for variation control is brought forward, which uses fixture＇s pre-variation to balance the impact of other error sources. It firstly forms a quantitative relationship model named ＂fixture pre-variation and dimension variation＂ based on the multivariate logistic regression, then verifies and analyzes the validity of the model. The tests on the application in actual assembly show that the new pre-variation method for dimension control is effectual.