外文翻译-注射模设计的三维模型发展概述.doc

1、毕 业 设 计（论 文）外 文 参 考 资 料 及 译 文译文题目： Three-Dimensional Kernel Development for Injection Mould Design 注射模设计的三维模型发展 学生姓名： 学 号： 专 业： 所在学院： 指导教师： 职 称： 20xx年 2月 27日Three-Dimensional Kernel Development for Injection Mould DesignT. L. Neo and K. S. LeeDepartment of Mechanical and Production Engineering, Nati

2、onal University of Singapore, SingaporeToday, many software “plug-ins” have been developed on high-level 3D modelling platforms to facilitate processes such as FEM analysis, CAM, injection mould design, simulation and visualisation. Such an arrangement is advantageous in many ways. However, it is no

3、t without shortcomings. Ideally, these “plug-ins” could also be developed using low-level 3D kernels for higher flexibility and better portability. This paper examines the various issues and methodologies related to the development of such 3D-based applications. The emphasis is placed on the softwar

4、e aspect. First, a methodology for the development of 3D-based applications is proposed. The idea is then implemented by developing an injection mould design application using a low-level 3D kernel called Parasolid. Based on design concepts used in an established mould design application, IMOLD, the

5、 development of a mould base design module is illustrated. An object-oriented programming language has been chosen for the development of the software on a Windows NT platform.Keywords: 3D kernel; Computer-aided design (CAD); Injection mould design; Parasolid1. IntroductionThree-dimensional CAD syst

6、ems have increasingly been used to speed up the product realisation process. One of the first steps involved in the automation of the product design process is the creation of the component parts in a 3D modelling application. The 3D model, upon creation, is called the digital master copy. This 3D d

7、igital model forms the key to a wide spectrum of process automation.Creating the 3D digital model of component parts is only the very first step. There are several other secondary tasks that must to be done before the part can be manufactured. Such tasks include finite-element analysis, jigs and fix

8、tures design, injection mould design, computer-aided manufacturing, simulation, and visualisation. Today, many application Plug-ins have been developed on high-level 3D modelling platforms to facilitate these secondary tasks. The 3D-modelling platform provides the plug-in software with a library of

9、functions as well as an established user interface and style of programming. As a result, the development times for these plug-ins are significantly reduced.Such an arrangement is advantageous in many ways. However, it has its shortcomings, especially in the long run. In order to develop a plug-in f

10、or established software, the developers must adhere to the many constraints imposed. There is a need to be consistent with the style of the parent software. The developers must be able to achieve any functionality they need with only the set of library functions provided. Most end-users need both th

11、e parent software and the plug-in. In many cases, however, they may be more interested in using only the plug-in software. An example of such a situation is in injection mould design. These users, however, must purchase the entire software package which includes many features and functions that they

12、 do not need. Such a large program is often very demanding on the hardware, which also means higher cost. The plug-in software is also very dependent on developments in the parent software. Whenever a new version is updated for the parent software, the plug-in developers have to follow-up on the cha

13、nges. These shortcomings may not exist if these applications were developed on a low-level platform. Ideally, these plug-ins could be developed using low-level 3D kernels for higher flexibility and better portability. In many instances, such a move is both feasible and advantageous.Traditionally, in

14、jection mould design is carried out directly on a CAD system. The entire injection mould, consisting of perhaps hundreds of components, is modelled and assembled on CAD systems such as AutoCAD, Pro/Engineer, and Unigraphics. As the injection mould design process is recursive, it is very time-consumi

15、ng to re-model and re-assemble the design. In this aspect, 3D CAD systems such as Pro/Engineer and Unigraphics, which are feature-based, have a significant advantage over 2D CAD systems such as AutoCAD. To further speed up the injection mould design process, plug-ins were developed on these 3D systems to automate certain stages of the design process. Examples of such add-on applications include IMOLD (Intelligent Mold Design and Assembly Systtem, developed at the National University of Singapore, based on Unigraphics), Expert Mold Designer (based on CADKE