2023年全國碩士研究生考試考研英語一試題真題(含答案詳解+作文范文)_第1頁
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1、畢 業(yè) 設 計(論 文)英 文 翻 譯課題名稱頂蓋后雨檐沖壓工藝分析與 頂蓋后雨檐沖壓工藝分析與拉延模設計 拉延模設計系 部 材 料 工 程 系姓 名 劉鵬專 業(yè) 材料成型與控制工程班 級 T833-2學 號 20070330436指導教師簽名(校內(nèi))指導教師簽名(校外)supporting system can be developed by systematically conve

2、rting the regulation of the design characteristics and the know-how’s of design specialists into the decision rules and knowledge bases. [4]2 The Current Design ProcessSince the dies are essential tools in manufacturing

3、the body 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 d

4、ies, 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 forming pressing process which cuts and removes the panel material by the fo

5、rce 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 pane

6、l.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

7、sizes and tentative methods, 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 compl

8、icated 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 perform the above three processes in a single step a design

9、 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 fo

10、rm 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 g

11、overned 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 geometry

12、data has defects or not. If there is a defect, it should be rearranged. After this process, the designer points out the punch profile and blank curve among the surfaces and curves which consists the geometry of the panel

13、.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 such as balance blo

14、ck, cushion pin, and rib, etc. are designed.3 Development of Design Supporting System for Press DieIn developing the design supporting system the following criteria must be satisfied. First, the design process should be

15、carried out according to the standardized design work flow. Second, the design variables are determined by the rules of design processes. Third, the complex geometry can be checked automatically.For embodiment, the desi

16、gn 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

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