外文翻译---汽车覆盖件冲压模辅助设计系统的开发

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1、PDF外文：http:/   毕  业  设  计 （ 论  文 ）  英   文   翻   译  课题名称  顶盖后雨檐冲压工艺分析与拉延模设计    系     部  材    料    工    程    系  姓     名  刘鹏  专     业  材料成型与控制工

2、程  班     级  T833-2 学     号  20070330436  指导教师签名（校内）   指导教师签名（校外）        年    月   日     Development of a Design Supporting System  for Press Die of Automobile Panels Sang-Jun Lee1, Keun-Sang Park2, Jong-Hwa

3、 Kim3, and Seoung-Soo Lee3 1 Dept. of Automobile, Dongeui Institute of Technology, Busan, South Korea leesjdit.ac.kr 2 Dept. of Industrial Engineering, Konkuk University, Seoul, South Korea ergparkkonkuk.ac.kr 3 CAESIT, Konkuk University, Seoul, South Korea jhkimkonkuk.ac.kr, ssleekonkuk.ac.kr Abstr

4、act. This paper presents the development of a design supporting system for press die of automobile panels. The proposed system supports the design process of press die efficiently and systematically by utilizing standard data, and reflecting knowledge of press die design collected and accumulated th

5、rough the interviews with design specialists working in a Korean motor company. This paper illustrates a methodology for systematic press die design, automatic checking of dimensions and implementation.In addition the rule-based design system is developed based on the product data. All components of

6、 the press die are regarded as product data and the omponents are regarded as the unit of press die. Parametric design using knowledge base and standard database is introduced to make it easier to deal with the complicated design knowledge easily. For implementation, the  ule-based design syste

7、m is programmed with C+ and Motif and the system can be linked with CATIA. 1 Introduction Reducing manufacturing cycle time is an important issue in the recent automobile industry with changing customer needs. Although the industry has adopted various new technologies such as CAD/CAM and factory aut

8、omation, the results do not meet the expected level. The main reason is that the new technologies must be adapted to the industrys own know-how and knowledge workflow, as well as administrative traits of a particular company. 1 In designing and manufacturing of trim die and draw die, the variety of

9、car panel shapes and the complexity of the structures complicate the problem even more. A lack of consistency in the design may cause weak relationship between the design and manufacturing, and presents difficulties in finding out the errors of designer. Due to these problems, a lot of time and reso

10、urces are wasted. 1 In spite of the variety and the complexity of the car panel structure, some consistencies can be found in the rules, knowledge and the methods of design, although they are redundant sometimes. 2-3 Hence, it is helpful to develop a design supporting system for trim die and draw di

11、e. The design supporting system can be developed by systematically converting the regulation of the design characteristics and the know-hows of design specialists into the decision rules and knowledge bases. 4 2 The Current Design Process Since the dies are essential tools in manufacturing the body

12、panel of an automobile,the design processes and the process plans of the dies determine the cost, quality,processing time and even the safety factors. 5 In the stamping process many kinds of dies such as draw dies, trim dies, flange dies, cam dies, flanking and piercing dies and progressive dies are

13、 used. Among them the trim dies are used in the shear forming pressing process which cuts and removes the panel material by the force of fracture made with cast iron or steel die.  1 The main functions of the trim die are as follows: 1) trimming to cut the boundary of a body panel, 2) removing

14、the scraps, 3) piercing to make holes on a body panel. Until now, these three processes were performed manually due to the complexity of rules to determine various design variables even if the designers are experts of commercial CAD system. They use approximate work-piece sizes and tentative methods

15、, and relied on past experience to layout the die sets. Also the resulting designs are prone to errors since it is difficult to figure out 3D free surface from the 2D draft and it is very complicated task to calculate the angles of normal and tangent vectors of the trim line and the heights of the i

16、nner shapes. To facilitate the die design process and perform the above three processes in a single step a design supporting system is proposed. The draw die process is to force the flat blank into a cavity of the required shape,  and at the same time to confine the metal between the drawing su

17、rfaces which is forced to change its form from a flat blank to the desired shape. This process is dependent on the thickness of the metal, depth of the draw, and height of the flange to be formed. Specification of the die for a particular application must be governed by the engineer who has sufficie

18、nt experience and knowledge about the operation and construction of the various die shapes. In the designing process of draw dies, the designer examines whether the panel geometry data has defects or not. If there is a defect, it should be rearranged. After this process, the designer points out the

19、punch profile and blank curve among the surfaces and curves which consists the geometry of the panel. The first step is to determine die face, offset line, design of wear plate, block lifter and gauge. Next important step is to determine the size and layout of die set. 1 Finally, several components

20、such as balance block, cushion pin, and rib, etc. are designed. 3 Development of Design Supporting System for Press Die In developing the design supporting system the following criteria must be satisfied. First, the design process should be carried out according to the standardized design work flow.

21、 Second, the design variables are determined by the rules of design processes.  Third, the complex geometry can be checked automatically. For embodiment, the design rule base is programmed using CATGEO, CATMSP in the CATIA version 4.2.1. 13 The program is developed on IBM RS/6000 with C+ and IUA for GUI. The design rules and knowledge are collected by the interviews of design specialists in the press engineering department of H Motor Company. The configuration of the system is presented in Figure 1.