Abstract : this paper introduces some key technologies in reverseengineering of automobile covering panel . such as , cmm , fitting of surface , reconstructing of surface , smoothing of surface etc 文摘:介绍了汽车覆盖件逆向工程中的若干关键技术，诸如，三座标测量技术、曲面拟合技术、曲面重构技术、曲面光顺、曲面片的拼接等技术。
At the same time computation time was controlled by the maximum iteration . the ideal cutting contour would be obtained . the cutting contours of three typical cover panels were calculated by using the error - adjustment method 优化方法基于材料的实际变形路径并进行迭代计算,同时采用最大迭代次数以控制计算时间,最终得到比较精确的修边轮廓线。
In automobile body manufacture process the cover panel design , the mold design and the manufacture processing occupies 60 % of the entire processing of automobile body design and the process . reduces this time for a while means speeds up the development of new vehicle type , and the cycle time of product puts in market 在车身制造过程中覆盖件的设计和模具设计及加工占整个车身设计和加工周期的60 %左右,缩短这一时间就意味着加快新车型的开发,缩短产品投放市场的周期。
This paper referred to the massive domestic and foreign technical material , elaborated in the sheet forming value simulation theory essential technology in detail , points out when analysis sheet forming question should use the big distortion ball plasticity fem and introduce the application characteristic and the function summarizes of the sheet forming simulation software dynaform . secondly , analyzed the cover forming characteristic , simultaneously introduced the influence cover forming factor in detail : such as ramming direction , the craft addendum surface and the material pressing surface , the radius of convex - concave mold , draw bead , pressure strength , blank size and craft margin and so on . and simulates many typical automobiles cover panel with software : such lateral board , back taillight pedestal and storage cover 其次,分析了覆盖件成形的特点和要求,同时详细介绍了影响覆盖件成形的因素如冲压方向、工艺补充面和压料面、凸凹模圆角、拉延筋、压边力、坯料尺寸和工艺切口等,并用数值模拟软件对多个典型的汽车覆盖件汽车后侧围板、后灯座以及轿车后备箱盖的冲压成形情况进行模拟,用模拟结果优化拉延工艺方案,比较了内覆盖件和外覆盖件在成形特点和要求的一些异同点,以及常见的起皱、拉裂和回弹、成形不足等缺陷的产生机理和相应对策,重点介绍工艺补充面和压料面的设计及优化方法,因为拉延是冲压工艺的关键工序,而工艺补充面和压料面的设计是拉延工序的关键,对消除缺陷至关重要。
Moreover , the paper compares the role of industrial designers and engineers played in the process of manufacture to explain the causes of perceptual gaps between them . this thesis also introduces the crucial manufacturing technology , the sheet metal ? punching , with a specific case of automobile body cover panel for the heavy trucks 最后,论文通过介绍制造业中最重要的板材成型? ?金属板材冲压成型,结合卡车和乘用车的车身金属覆盖件的制造加工特点和作者本人的设计实践,探讨如何协调设计与制造来完成汽车造型设计。
