2023年全国硕士研究生考试考研英语一试题真题(含答案详解+作文范文)_第1页
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1、附录引用的外文文献及其译文A study on the improvement of formability for elliptical deep drawing processesD.H. Parka,*, S.S. Kanga, S.B. ParkbAbstractThe punch and die corner radii, the lubricant condition, the working speed, the blan

2、k-holding force, the friction force and the clearance change the formability of the deep drawing process. In general, sheet metal forming may involve stretching, drawing or various combinations of these basic modes of de

3、formation. The influence of the punch and die corner radii is of great importance in the design of sheet metal working processes. Recently, most of the research for the sheet metal deep drawing process has been performed

4、 on the formability of an axisymmetric shape, but there are not any concrete reports on the formability of a non-axisymmetric shape. In addition,the conventional corner radii of the punch and die have been determined by

5、trial-and-error using industrial experience and post-processing tests, and only approximate corner radii of the punch and die have been presented. In order to obtain the optimal products in the deep drawing process, elli

6、ptical deep drawing tests were carried out with several corner radii of the punch and die. In this study, the optimal corner radii of the punch and die in the deep drawing process with a non-axisymmetric blank shape are

7、proposed.Research has been carried out using diverse technologies including experimentation and the finite element method. C 2001 Elsevier Science B.V. All rights reservedKeywords: Non-axisymmetric deep drawing; Punch co

8、rner radius; Die corner radius; Finite element method; Blank shape1. IntroductionMany research investigations for cylindrical products have been carried out into the fundamentals of the deep drawing process [1—4]. Thus,

9、this has produced many applied 90° 222 307 452.2. Experimental equipmentDeep drawing tests were carried out using a punch with a diameter of 56 mm and a die with a

10、diameter of 60 mm.Fig. 1 presents the dimensions of the tools used in the first drawing process. The clearance and the corner radii of the punch and die are listed in Table 2. The forming sequence for the product consist

11、s of three processes which are: (a) first drawing; (b) redrawing; (c) elliptical drawing. The corner radii of the punch (Rp) and die (Rd) were different for each process. The initial blank-holder force was determined as

12、the minimum force that could prevent the wrinkling of the blanks and was kept constant during the test for each blank.Elliptical deep drawing tests were performed at various corner radii in a 300 t mechanical press. The

13、corner radii of the punch and die in first drawing were the three types mentioned in Table 3.Fig. 1. Dimensions of the tools (mm) used in the first drawing process.Table 2 Corner radius and clearance (t= 1.6 mm)Process

14、 Corner radius (mm) Clearance (mm)First drawing Rp =15, Rd = 10 2 (1.25 t)Redrawing Rp =12, Rd = 8 2 (1.25 t)Elliptical drawing Rp =8

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