三维CAD注射模具设计外文翻译文献
-装配设计。在传统的计算机辅助设计/计算机辅助制造系统中，模具被表示为一个完整的几何和拓扑实体模型，这个模型是由一个三围欧式空间中面、边、顶点组成。这样的表示适用于视觉显示和执行几何计算密集型任务，例如工程分析与仿真。但是，对于基于制品几何实体及其关系的高层信息的要求决策的任务，这种形式是不适用的。模具设计师喜欢装配环境的设计，而不是简单实体模型的环境。这个理念也是由Ye等人提出来的。
-设计制造。一个完整的注塑模具设计开发周记是由模具设计和模具制造工艺组成的。为了使计算机辅助设计/计算机辅助制造应用于模具设计，模具的制造特点应是由特定的数控机床抽象出来并分析的。无论是工艺规划还是数控代码都应该是自动化生成，使最终设计的模具得以制造。
-设计图纸。对于许多公司来说，注塑模具的设计必须表示有着详细尺寸的工程制图。能够从最终的注塑模具设计中自动生成这些图纸的计算机辅助设计/计算机辅助制造工具将是有用的。
基于上述分析，我们研究的重点是开发代表“他们有什么”和“他们想要什么”的技术。
代表“他们想要什么”实际上是知识和注塑模具对象的表示。开发“他们有什么”意味着将为注塑模具设计的智能、交互式的工具，结合到一个完整的设计环境中。因此，为模具设计师提出的IKB-MOULD实现了上述的两个要求。
三维CAD注射模具设计外文翻译文献
原文:
3D CAD knowledge-based assisted injection mould design system
W.M. Chan. L. Yan. W. Xiang. B. T. Cheok
1 Introduction
In recent years the plastic product manufacturing industry has been
growing rapidly. A very popular moulding process for making plastic parts is injection moulding. The injection mould design is critically important to product quality and efficient product processing. Mould-making companies, who wish to maintain the competitive edge, desire to shorten both design and manufacturing leading times by automating the design process. Thus, the development of a computeraided injection mould design system (CAIMDS) is becoming a focus of research in both industry and academia.
Recently published papers show that research in automatic mould
design focuses on individual components of the mould process. For example Ong et al. and Ravi focused their research on the feeding system. Wang et al. focused their research on the ejection system. Others focus their research on the general design. Most research done on the general injection mould system can be classified into two areas:(a) functional, conceptual and initial mould designs;and (b) algorithms to automate
三维CAD注射模具设计外文翻译文献
mould generation.
Functional, conceptual and initial designs of the injection mould are
applied mainly to the pre-mould design. Such design involves selecting a suitable mould base, arranging the cavity layout, designing the runner and designing the gate. The objective is to come up with a large number of very different product ideas for a certain requirement. Britton et al. addressed injection mould design from a functional perspective by presenting the Function-Environment-Behaviour-Structure (FEBS) model.The study fostered a wide range of design alternatives. Costa and Young proposed a product range model (PRM) to support the reuse of design information in variant design cases. The general structure of a PRM is defined in terms of design functions linked with sets of design solutions, interactions between potential solutions and knowledge links. Ye et al. presented an approach to automatic initial design with algorithms that calculate the cavity number and automatically lay out the cavity. The initial injection mould design involves extensive empirical knowledge of the structure and functions of the mould components. Thus, a lot of researchers adopt a knowledge-based approach. Several knowledge-based systems (KBSs) were developed to advise plastic material selection, capture injection mould part design features, analyse mouldability, automate the mould design process and develop mould design for manufacture. Examples of such systems are GERES (Nielsen),
三维CAD注射模具设计外文翻译文献
PLASSEX(Agrawal and Vasudevan), EIMPPLAN-1 (Chin and Wong), CADFEED ( Ong et al.), ICAD (Cinquegrana), IKMOULD (Mok et al. ) and KBS of Drexel University (Tseng et al.). However, these KBSs consider only certain aspects of the total design.
As for the automatic generation of an injection mould, a number of
theoretical research works were conducted to automatically determine the parting direction, to determine the parting line, to generate the parting surface, to recognise undercut features and to generate the core/cavity. Ravi and Srinivasan presented nine rules that can be used by the mould design engineer to develop a suitable parting line in the product. These rules are projected area, flatness, draw, draft, undercuts, dimensional stability, flash, machined surfaces and directional solidification. Hui and Tan proposed the sweep method to form the cavity and core. The cavity and core are generated in a number of steps. Sweeping the mould part in the draw direction generates a solid. One end of the swept solid is subtracted from the first mould block. The other end of the mould block is subtracted from the mould part. The results of the above steps are subtracted with the part at the closed position to obtain the cavity and core. Shin and Lee proposed a method of core and cavity development so that the side cores and corresponding core and cavity plates can be generated. This method is composed of 3 steps. The designer determines the parting line that separates the product into 2 groups of faces. Each
三维CAD注射模具设计外文翻译文献
group face has the parting surface attached to it. Then external faces are added to each group face. Shin added that a mould could be made up of many pieces in addition to the cavity, core and side cores. Hui studied the mouldability of an injection mould based on an external and internal undercut analysis only for polyhedral solids. A blockage concept is presented to determine the main parting direction and a subdivision technique is developed to evaluate the geometry of an undercut. Chen et al. introduced the concept of visibility maps (V-maps) of the pockets to determine the parting direction. The method did not take into account internal undercuts. Fu et al. and Nee et al. gave a new classification of undercuts according to the external loops and the internal loops of a moulded part. The parting direction is then determined based on the proposed parting direction criteria considering the directions, location, number and volumes of undercut features. Fu et al. proposed an approach to generate the parting surface by extruding the parting line edges and create the core/cavity block using the Boolean regularised difference operation (BRDO). A methodology that generates non-planar parting lines and surfaces is presented by Nee et al.. Wong et al. proposed a method to determine the cutting plane of a complex shaped product. Their method uses an algorithm that slices the product. The parting line and surfaces
formed by this method are planar.