【作者】 王红军；

【导师】 张益华；

【作者基本信息】 南京航空航天大学 ， 航空宇航制造工程， 2005， 硕士

【摘要】 汽车整车产品中,覆盖件特别是外覆盖件的市场生命周期最短,变化最频繁。覆盖件具有形状复杂、结构尺寸大、精度高、表面质量要求严格的特点,其工艺补充面、模具设计成为整车开发中的一个“瓶颈”。 应用冲压成形 CAE 技术,可以模拟成形过程材料的流动,预测开裂、起皱、回弹等缺陷。但模拟计算时相关参数与实际符合程度,提高模拟计算的可信度,是 CAE 在工程应用中的一个难点。 本文简要阐述了有限变形的基本理论、冲压成形 CAE 的关键技术,CAD/CAE基本流程等,指出了在 CAD 模型处理、有限元模型建立中应该注意的问题。 本文以典型外覆盖件(前翼子板)为研究对象,应用正交试验法确定试验方案,在其他成形条件一定,研究了板料与凸模、凹模的摩擦,压边力,凸模与凹模的间隙,虚拟凸模成形速度等五因素,在四个不同水平下,对成形性能的影响。将计算结果同实际成形件厚度相比较,通过极差、方差分析,得出上述因素对成形性能的不同影响和显著程度。得出压边力、虚拟凸模成形速度对成形性能影响较其他因素影响大,上述五因素对成形性能影响均属非显著。并得出理论优选的试验条件。更多还原

【Abstract】 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.更多还原