Research On Key Simulation Parameters Of Automobile Panels Forming

Compared with other parts of the automobile, the panels, especially outer panelschange most frequently and their market time are shortest. Panels have manycharacteristics, such as complicated shape, large dimensions, high accuracy and strictdemand for surface quality. Therefore, the designs for addendums and dies of panelsare 'bottleneck' for the automobile development. Simulate the metal flows in the sheet metal forming, and predict the defects,such as tearing, wrinkling and springback, with application the CAE technology ofsheet metal forming (SMF). However, it is difficult to applying CAE in industry thatthe simulation parameters are in accordance with the practical conditions andimprovement the credibility of the numerical simulation. In this paper, finite deformation theory,the know-how technologies in CAE ofSMF and the basic course from CAD to CAE are briefly introduced. Some attentivepoints in CAD modeling and finite element method modeling are put forwardrespectively. One of outer automobiles panels, the front wing, is as the research object in thispaper. Orthogonal test is used to construct the numerical simulation plan. Under otherparameters are constant, conducted research into five parameters — frictioncoefficients between blanksheet and punch or die, blank holder force, gap betweenpunch and die, virtual velocity of punch—affecting the forming of the object one.Compared the simulation thickness with actual thickness, obtained the differenteffects and significance degrees on the forming with applying range analysis andvariance analysis. Blank holder force and virtual velocity of punch have moreeffective on the forming than the other three. However, the effects of the fiveparameters are not significant. The reasonable simulation condition in accordance with practical ones isobtained.