基于事例推理的模具分型面设计方法研究

在全面分析分型面自动设计方法的基础上，提出了基于事例推理的注塑模分型面设计方法，给出了基于事例推理的分型面设计总体框架。运用特征造型技术进行塑件三维建模，以主形状特征为索引构建了含有分型面信息的塑件事例知识库。采用正向推理策略与相似性求解相结合的方法，实现了模具分型面的自动推理设计，给出了分型面位置设计的推理方法与流程，提高了模具设计的质量和效率。     

注塑模具模架选型中知识库与推理机连接技术的研究

在总结模架的基本知识及选型方法的基础上,利用KBS系统中的RBR推理方法实现注塑模具中模架的自动化设计,利用参数化设计技术生成模架系统的三维模型库,利用VB编程设计出系统操作界面,建立了注塑模具CAD专家系统中模架设计知识库和推理机,实现了推理机与知识库之间的连接。文章以实例介绍了模架知识库与推理机连接过程,KBS系统推理机通过合理调用知识库中的知识数据,实现模架的自动选型。     

Algorithm for automatic parting surface extension in the mold design navigating process

This study focused on the planning and development of an algorithm and process for automatic parting surface design under the CAD software architecture. Relating to the smooth opening of a mold, the parting surface is an important step of mold design. The parting surface can be categorized into the main parting surface and the shut-off parting surface. This study developed an algorithm of extension rules for the main parting surface and determined the contour vector and geometric relationship via computer software. It can realize the main parting surface automatic extension and can be embedded into a web-based mold design navigating process. Through a standardized design process, it can reduce the number of mouse clicks by 90%, enabling users to rapidly complete mold designs, reduce design errors, and improve efficiency.     

基于Pro/E利用自动分型面技术创建模具型腔研究

简要介绍了Pro/E自动分型面技术,详细介绍了自动分型面形成操作步骤,并成功利用分型面创建了模具型腔;对分型面作了简要分析,利用自动分型面技术可以快速而准确的创建分型面,提高了设计效率.     

Feature extraction from freeform molded parts for moldability analysis

In the design of plastic injection molds, the depressions and protrusions (DP) preventing the removal of molded part from mold are referred to as undercuts. This paper describes an approach to recognize DP feature within the curvature region representation based on the curvature properties of entities in B-rep model. The recognized depression features and the concave transitions between protrusion features are potential undercuts which affect the choice of parting directions of the molded part. The possible withdrawal directions of the potential undercuts are derived by geometric reasoning and visibility map computation. This method can recognize isolated and intersecting features with planar, quadric, and freeform surfaces. The identified potential undercuts with their possible withdrawal directions can provide decision support information for mold design such as selecting parting direction, parting lines and surfaces, etc. The case study is presented to verify the feasibility of the developed method.     

线壳盖塑料模具设计

介绍了在CAD和Pro/E环境下一副单分型面注塑模具的设计过程。本设计着重介绍了模具设计的整个流程,包括塑件及材料分析、分型面与排气系统设计、浇注系统的设计、成型零件设计、冷却系统等部件的设计,同时分析了该模具的注射过程。模具结构紧凑,工作可靠,操作方便,生产效率高。     

DISCRETIZATION APPROACH USING RAY-TESTING MODEL IN PARTING LINE AND PARTING SURFACE GENERATION

Surface classification, 3D parting line, parting surface generation and demoldability analysis which is helpful to select optimal parting direction and optimal parting line are involved in automatic cavity design based on the ray-testing model. A new ray-testing approach is presented to classify the part surfaces to core/cavity surfaces and undercut surfaces by automatic identifying the visibility of surfaces. A simple, direct and efficient algorithm to identify surface visibility is developed. The algorithm is robust and adapted to rather complicated geometry, so it is valuable in computer-aided mold design systems. To validate the efficiency of the approach, an experimental program is implemented. Case studies show that the approach is practical and valuable in automatic parting line and parting surface generation.     

电热壶体的注射模设计

在注塑模具中，分型面的设计将直接影响模具的复杂程度和制造成本，并对产品的质量产生影响。以PRO／MOLDESIGN软件包为工具，通过对电热壶体的结构和工艺性分析，比较详细地论述了电热壶体模具分型面的设计考虑因素，并阐述了在PRO／MOLDESIGN上快速生成模具型芯、型腔的方法。     

壶体注塑模设计

在注塑模具中分型面的设计将直接影响模具的复杂程度和制造成本,并对产品的质量产生影响。以PRO/MOLD-ESIGN软件包为工具,通过对电热壶体的结构和工艺性分析,较详细地论述了电热壶体模具分型面的设计,并阐述了在PRO/MOLDESIGN上快速生成模具型芯、型腔的方法。     

基于Pro/E平台的智能注塑模设计

以一种结构复杂,不易分型和出模的洗衣机甩干筒盖为例,利用Pro/E及自行开发的注塑模智能专家设计系统进行注塑模具设计的一般步骤和方法.实践证明,该系统提高了模具设计的效率,并对复杂塑料件的注塑模设计有参考价值.     

基于实例推理的自动武器辅助设计系统

介绍了基于实例推理与设计的原理,提出了一种支持自动武器设计的计算机辅助设计系统.详细探讨了系统设计方案生成过程中的各个关键技术环节:用XML进行实例的知识表达,用比较归纳法与最近相邻法相结合的方法进行实例检索.在此基础上,建立了一个基于实例推理的自动武器辅助设计开发管理平台.     

清新剂盖注射模设计

进行了清新剂盖注射模具设计,介绍了清新剂盖注射模的结构及工作过程,并对分型面的确定、浇注系统形式、主流道设计和模具的工作过程等重要方面给予了详尽的阐述。本设计可为同行提供一定的参考,具有广泛的使用和推广价值。     

Application of Case-Based Reasoning in Die-Casting Die Design

This paper presents a study on die-casting die design based on case-based reasoning (CBR). Being different from a traditional die-casting CAD system, this system stores the knowledge and experience as cases, and modifies a previous case to satisfy a new situation. By saving the new solution in the case library after the latest problem has been solved, the system is able to perform self-learning from the experience accumulated. The work includes: 1. Developing a case-based reasoning environment for diecasting die design, so that the system can self-learn from the previous consultation itself and become more efficient. 2. Developing an effective case representation and adaptation methodology for reusing previous design resources efficiently. This paper focuses mainly on the design of die-casting dies. However, the proposed framework is generally adaptable for other processes (such as fixture design and injection mould design) by customising specific process features and encoding process design rules.     

基于UG MoldWizard软件注塑模分型面设计初探

注塑模具分型面设计是模具设计中的重要部分,首先介绍模具分型面的选择原则,通过典型案例介绍UGMoldWizard四种分型面的创建方法.提出注塑模分型面设计的关键是判斯创建的分型线是否在同一个平面或是曲面内,再采用相应创建曲面的方法创建分型面.目的是为类似注塑件分型面的创建提供参考.     

基于Pro/E的浏阳河酒瓶模具设计

基于Pro/E环境介绍了酒瓶模具的设计方法,玻璃模具有其自身的特点,其中重要的是分型面的建立方法,本文以浏阳河酒瓶为例,提出一种建立酒瓶模具分型面的新方法,即平整和复制方法.该方法易于掌握,在酒瓶模具的设计中有广泛的应用前景.     

A computational system for process design of injection moulding: Combining a blackboard-based expert system and a case-based reasoning approach

Process design of injection moulding involves the selection of the injection moulding machine, mould design, production scheduling, cost estimation, and determination of injection moulding parameters. An expert system approach has been used to derive the process solution for injection moulding over the past few years. However, this approach is found to be incapable of determining the injection moulding parameters owing to the fragile nature of the knowledge for setting the moulding parameters. In addition, the existing expert systems for process design lack proper architecture for organising heterogeneous knowledge sources. In this paper, the combination of a blackboard-based expert system and a case-based reasoning approach is introduced to eliminate the deficiency of the existing expert-system approach to process design, from which a computational system for the process design of injection moulding, named CSPD, has been developed. CSPD first derives the process solution including the selection of the injection moulding machine and the mould base, tooling cost, processing cost estimation, and production scheduling based on the blackboard-based expert-system approach. It is then followed by the determination of the injection moulding parameters based on the case-based reasoning approach and the previously derived partial solution.     

一种模具脱模方向自动判定及优选算法

提出一种自动判别模具脱模方向的算法。该算法以基于图的特征识别所获得的特征作为研究对象,通过特征间可视性分析运算来判断零件潜在的脱模方向,引入脱模方向判定原则,最终确定出脱模方向。该算法可解决存在多特征复杂零件脱模方向的判定问题,不但可以获得最优脱模方向,还可得到侧凹特征的相关信息。在UG平台上开发的自动脱模方向判别系统,提高了模具设计中该环节计算的效率和精度,为模具设计后续工作提供可靠保障。     

A computational system for process design of injection moulding: Combining blackboard-based expert system and case-based reasoning approach

The process design of injection moulding involves the selection of the injection moulding machine, mould design, production scheduling, cost estimation, and determination of injection moulding parameters. Expert system approaches have been attempted to derive the process solution for injection moulding in the past few years. However, this approach has been found to be incapable of determining the injection moulding parameters owing to the difficulty in setting the moulding parameters. In addition, the existing expert systems for process design lack the proper architecture for organising a heterogeneous knowledge source. In this paper, the combination of a blackboard-based expert system and case-based reasoning approach is introduced to make up the deficiencies of the existing expert-system approach to the process design, from which a computational system for process design of injection moulding, named CSPD, was developed and described. CSPD first derives the process solution including the selection of injection moulding machine and mould base, tooling cost, and processing cost estimation, and production scheduling based on the blackboard-based expert-system approach. It is then followed by the determination of the injection moulding parameters based on the case-based reasoning approach and the previously derived partial solution.     

基于知识重用的数控深孔加工机床的快速设计

为满足多元化需求的用户对数控深孔加工机床的个性化要求,提出了一种基于知识重用的数控深孔加工机的快速设计方法。选用规则推理(RBR)与实例推理(CBR)两种方式相结合的混合推理技术进行数控深孔加工机床知识重用的研究。基于知识重用理论,根据数控深孔加工机床结构和功能的设计要求对其进行模块划分,建立数控深孔加工机床模型库。使用Visual Basic 6.0(VB)对Solid Works 2010进行二次开发,选择Access为数据库,研究快速设计系统,实现数控深孔加工机床快速化设计。     

基于ART-2神经网络的设计知识需求研究

通过分析产品设计知识获取和知识共享研究中存在的问题,结合本体理论的运用,构建了产品设计中的概念语义,并利用OWL+RDF+XML形式化语言给出了案例知识的表达,在研究ART-2神经网络竞争学习和自稳机制的基础上,设计了案例的多级组织,实现了基于案例推理(CBR)的检索机制,提升了案例分类和检索的效率。同时,利用案例的聚类和学习机制,研究特征权值的自动获取和优化,并通过应用实验验证了该研究成果的实用性和有效性,从而较好地解决了产品设计中的知识需求。