【作者】 李建心；

【导师】 项辉宇； 黄克正；

【作者基本信息】 山东大学 ， 机械电子工程， 2005， 硕士

【摘要】 覆盖件是车身的基本组成部分,其质量优劣对整车性能的影响十分明显。由于覆盖件一般具有复杂的形状并且对零件各部位的拉延均匀性有极高的要求,因而设计合理的拉延工艺就极为重要。覆盖件拉延工艺的设计一般包括以下内容:翻边展开、拉深方向选择、坯料估算、工艺补充面的搭建、压料面的添加以及拉深筋的布置等等。 本文对汽车覆盖件拉延工艺的关键技术,即拉深方向的优化设计、坯料估算、工艺补充面的自动搭建等进行研究,以通用的UG软件为平台,借助其二次开发工具UG/Open API,利用VC++来对UG做二次开发,开发了一个内嵌于UG系统的专用汽车覆盖件拉延成形工艺设计的软件功能模块。具体研究内容如下: (1)在拉深方向优化设计的开发中,主要研究了在UG环境下开发优化汽车覆盖件拉深方向模块的方法,总结了拉深方向确定的基本原则。根据原则主要建立了三方面的数学模型:确定拉深方向可行域的数学模型、优化拉深方向的目标函数和评价函数。在所建数学模型的基础上,开发出了可以快速、准确地确定覆盖件拉深方向的软件模块,并且给出具体的应用实例。 (2)在覆盖件坯料展开方面,概述了目前普遍采用的反算覆盖件毛坯展开尺寸的方法。然后利用几何分析法,建立了估算最大毛坯尺寸的数学模型。根据数学模型,开发出了求解毛坯尺寸的软件模块,并采用实际例子对模块进行验证。为了求解结果更接近实际,采用成型度概念对所求得的最大结果进行优化。 (3)拉深方向确定之后,对汽车覆盖件进行工艺补充。首先对常见的工艺补充面截面线类型进行分析,建立数学解析模型并进行参数化设计,并且给出特殊问题的处理方法。然后详述了工艺补充面的自动搭建过程,系统阐述了实现坐标系变换的三种方法,为程序开发奠定了理论基础。本章以微型车后门为实例,对工艺补充面模块进行考核。 通过应用实例验证,本文独立开发的软件功能模块是可行的,并且将对更多还原

【Abstract】 Auto-body panel is basic constituted part of bodywork, its quality distinctly influences the capability of whole car. As the shape of auto-body panel is very complicated, and auto-body panel requires forming process uniformity of accessory position, the design of forming process is very important.The design of auto-body forming process commonly includes edge un-wrapping, choice of drawing direction, roughcast reckoning, design of addendum, adding the binder surface and setting the draw bead.In this paper, the key technology of auto-body panel forming process is first studied, including the optimizing of drawing direction, sheet unwrapping and the automatic adding of addendum. Then professional and effective modules are created using UG software as a platform for secondary program, using the exploitation tool of UG/Open API, using C programme and using the translating circumstance of VC++. The detailed research performed is as follows:(1) In the aspect of the optimizing the drawing direction, the methods of creating the modules for optimizing the drawing direction of auto-body panels were presented, and basic principles were concluded. According to these principles, three mathematic models, including of the model deciding the possible area of drawing direction, goal function and assessment function of optimizing the drawing direction, were established. Based on the mathematic models, the software module was developed. This module can decide the drawing direction of the panels rapidly and preciously.The typical example is provided.(2) In the aspect of unwrapping the panel sheet, the methods generally usedto estimate the dimensions of the unwrapped sheet were discussed, and the mathematic model for estimating the maximum dimensions of the sheet was established. Based on the mathematic model, the software module for deciding the dimensions of the sheet was developed and testified by the practical examples. To further improve the precision, the maximum solution was modified according to the concept of molding degree.(3) After the drawing direction has been created, the addendum of auto-body panels will be added. At first, the section curves of addendum is analysed, mathematic analytic models are established, the parametric design is finished and method to deal with especial questions is presented.Then the adding process of addendum is overall narrated and three methods of WCS conversion are specified to establish theoretic bases for secondary program.A car back-door is designed by this method as application example to testify the feasibility of this addendum module.With the application of examples, it is feasible to develop professional and effective modules using secondary program technology based on UG software. This will increase quality of auto-body panels die and shorten cycle of making auto-body panels.更多还原