Study on Vehicle Clearance Tolerance and Extreme Value Based on 6σ

Part deviation mean, the matching two parts, the mean deviation direction should be consistent, and the deviation is consistent; For mass-produced parts, there are fluctuations between individual and individual parts, The deviation mean trend is consistent (P’ small), It does not mean that the P value of the vehicle DTS target can be achieved. By matching the sample frame, from focusing on the qualified rate of single parts to the matching of associated parts, And to evaluate the matching of the door cover size tolerance, Improve the matching ability of overlays, Combined with the encrypted measurement data application, lock the problem points; Using optical scanning, the deviation value is evaluated by locating the fitting with the contour matching point. Through the fitting evaluation of the outer plate, the problems are intuitively found and rectified.