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1、毕 业 设 计（论 文）英英 文文 翻翻 译译课题名称顶盖后雨檐冲压工艺分析与顶盖后雨檐冲压工艺分析与拉延模设计拉延模设计系 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 PanelsSang-Jun Lee1, Keun-Sang Park2, Jong-Hwa Kim3, and Seoung-Soo Lee3 1 Dept. of Automobil
2、e, 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 Abstract. This paper presents the development of a d
3、esign 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 through the interviews with design specialists wo
4、rking 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 the press die are regarded as product data and
5、 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 system is programmed with C+ and Motif and the system can
6、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 automation, the results do not meet the expected level.
7、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 car panel shapes and the complexity of the structures
8、 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 resources are wasted. 1 In spite of the variety and the c
9、omplexity 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 die. The design supporting system can be developed by s
10、ystematically 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 panel of an automobile,the design processes and the p
11、rocess 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 used. Among them the trim dies are used in the shear
12、 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 the scraps, 3) piercing to make holes on a body panel. Unti
13、l 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, and relied on past experience to layout the die sets. Als
14、o 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 inner shapes. To facilitate the die design process and perfo
15、rm 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 surfaces which is forced to change its form from a flat blank to th
16、e 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 sufficient 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 geo
