模具并行工程系统研究

在综述模具并行设计方法的基础上,论述了模具并行工程系统的实施方案,提出了模具并行工程组织与系统结构、基于特征的知识表达与信息共享机制、模具计算机辅助报价与成本分析方法,以及综合应用知识推理、成本分析、CAE模拟等多种手段的并行设计执行机制。     

Expert parts assignment in cellular manufacturing using pattern recognition

This paper presents a new tool for on-going decision making needed to assign parts to flexible manufacturing cells, in support of the dynamic dispatching and scheduling required for day-to-day operation. A CAM-oriented modelling system and associated expert modules: Analyzer, Synthesizer and Recognizer have been developed to perform the automatic and dynamic assignment of parts to manufacturing cells directly from a feature-based CAD modelling system. It is based upon knowledge of both the part design features and manufacturing processes. Feature-based representation of components structure and related machining operations is presented. The proposed technique represents a new and generic methodology for integrating CAD and CAM. Artificial intelligence techniques such as expert systems, pattern recognition and finite-state automata are applied in this research. Symbolic strings containing the design and machining attributes of components are analyzed using knowledge of rules and syntactic pattern recognition techniques, then cell inference and part assignment are carried out using domain specific expert rules. Two case studies are included to illustrate the feasibility of these approaches for rotational and prismatic parts. It is believed that this research provides some useful contributions for both CAD and CAM integration as well as parts assignment techniques for cellular manufacturing.     

Automated Design of Net-Shape Forming Processes

An expert design system has been developed for net-shape forging of ax-isymmetric shapes and hard-to-work alloys—helping to cut manufacturing costs. An initial design stage uses overall flow analysis, while the more-detailed second stage uses workability analysis. Knowledge bases have been developed for both design stages, along with a control structure that implements an efficient iterative design logic. Simulation by finite element modeling (FEM) verifies the final design. FEMalso can be used in conjunction with a workability analysis concept to enhance the existing knowledge bases for crack defects.     

基于RP技术陶瓷型精铸模具的应用与发展

介绍RP技术和陶瓷型铸造技术在模具设计、制造、工艺方面的特点及应用现状,从保证模具尺寸精度、降低表面粗糙度、缩短制造周期、降低生产成本等方面分析,指出将RP技术与陶瓷型精铸相结合,是模具制造业的发展方向之一,特别是对于形状复杂、难以进行机械加工成型的型腔曲面,效果更为明显,是适合我国技术现状和装备条件的模具成型新方法.     

基于Pro/E的某款手机底壳注塑模具设计

以Pro/E的外挂软件塑料顾问进行了手机底壳的成型工艺性分析,并导入模架设计专家系统EMX,进行手机底壳的注塑模具设计,最终设计出可有效用于生产的模具结构。实践表明,利用Pro/E软件可以大大缩短模具设计和加工周期,降低模具设计成本。     

冲模结构知识库知识与控制性知识的表示

根据模具设计知识的类型和特点,研究了ＣＲＢ系统中冲模结构知识库知识与控制性知识的表示方法,导出了符合工程设计习惯的冲模结构知识库知识表示方法－典型冲模结构特性图和与其对应的适合于ＣＢＲ推理的控制性知识表示方法－基于冲模结构特征的产生式规则表示。     

注塑模具知识库系统中知识表示的研究

将知识工程理论引入注塑模设计过程，开发一个知识库系统，需要对模具设计相关的知识和经验进行总结和分类，研究不同的知识表示方法。采用框架表示、规则表示、框架／规则混合表示等适合塑料注塑模具设计知识的知识表示模式，并研究在二次开发平台SolidWorks环境下，三维实体模型的驱动及其实现。     

Grippex: A hybrid expert system for selecting robot gripper types

An expert system to assist manufacturing engineers in choosing appropriate grippers for a robotic installation is described. The expert system has a hybrid knowledge base consisting of rules, frames, objects and procedures. The knowledge employed in the selection process is outlined and the main implementation details of the expert system are presented. An example is given of a consultation session using the expert system.     

基于网格技术的模具协同设计制造模式研究

通过对模具设计制造过程及其特点的分析,将网格技术引入模具行业,研究基于网格技术的模具异地分布式设计制造的协同原理,提出一种由分布式资源、网格中间件和应用层组成的模具协同设计制造系统的体系结构,探讨一种新的模具设计制造模式以及实施技术.初步运行实例表明,基于网格技术的模具协同设计制造模式对于提高设备资源及其计算能力的利用效率,加快模具开发进程有重要作用.     

模具设计与制造专业课程标准理论与实践探索

为使模具设计与制造专业课程理论与实践能有机融合,在加强学生感性知识的基础上,采用基于工作过程导向的教学方法使学生既快又好的掌握模具设计与制造的基本理论与实践方法。本文结合《模具设计与制造》课程的性质、教学方法和教学手段,以高职类院校在此课程教学中的职业活动过程为导向,在3年制模具设计与制造专业实施项目化教学,收到良好效果。     

基于事例的注塑模架自动设计系统的研究

通过以当前模具企业模具企业和制造流程的分析,提出了首先进行模架设计,然后并行进行架定购和详细设计的思想;根据注塑模架设计过程的特点,引入事例推理设计技术,提出基于事例推理的注塑型架自动设计系统,并对其关键技术进行了详细的分析。按照软件工程思想,给出系统的数据流程图及系统结构图。整个系统基于参数化图形库,并提供了引导用户交互自行模架的工具,能方便地改造成符合用户要求的专用模架设计系统,并可进一步用于注塑模具详细结构设计,可较大幅度地提高模具设计的速度与质量。     

注射模协同设计系统中的冲突消解策略

目前，注射产品开发趋于多元化，许多产品的设计来源于既有的实物，并通过基于RE／CAD／CAE集成的协同，实现快速制造。在注射模协同设计过程中，由于各协同小组对设计的考虑角度、评价标准和领域知识不尽相同，从而会导致设计冲突。冲突在设计过程具有特有的正、负面影响，因此冲突消解在协同设计系统中占有重要的地位，故提出了注射模协同设计系统结构中的冲突产生、约束求解和冲突消解策略。     

模具敏捷制造系统研究

针对模具设计制造过程复杂、条件苛刻和单件或小批量生产的特点 ,论述了模具产业发展敏捷制造技术的必要性。提出了模具敏捷制造系统框架和基于STEP与特征技术实现信息集成与过程集成的运行机制。阐述了基于Internet/Intranet的开放式可视化协同工作平台的模具敏捷制造实施方案。     

压铸模具选材和辅助设计专家系统

基于数据库技术和模块化设计方法,采用产生式规则知识表达方法,将选材和设计的大量相关数据、专家经验知识和判据构成知识库,并利用语言编程方法建立了专家系统的整体框架.研究开发了理论依据充分、先进实用的热作模具选材及设计专家系统,实现了热作模具选材和设计的信息存储、快速查询及专家推荐等功能,为实现模具生产工艺制定提供依据和指导.     

滚动轴承知识库系统研究

通过研究滚动轴承的领域知识特点,提出滚动轴承知识表示方法和知识库系统的总体结构,结合KBE(Knowl-edge Based Engineering)技术和专家系统技术构建了滚动轴承知识库系统,为滚动轴承智能化设计提供支持。     

Design space computation based on general design theory applied to knowledge formulation in simulation-based production planning

Digitalization is crucial for increasing the productivity of manufacturing systems and processes, where model-based systems engineering is a key engineering discipline to support related design and planning activities. However, knowledge used in these activities is not sufficiently captured through exhaustive simulation-based searches on design spaces. This study proposes a design space model based on General Design Theory to express such knowledge using the properties of topological spaces. A simulation-based production planning case study demonstrates computation of a design space from simulation experiments using inductive and deductive reasoning, and formulation of complex design options for production plans to meet performance criteria.     

基于知识库的压铸模具专家系统

以压铸模具优化选材、结构设计及模具报价等权威知识和专家经验为基础,建立了压铸模具材料知识库、设计知识库和报价知识库,设计了主要由选材模块、设计模块、报价模块和知识模块组成的人机界面,通过人机界面与知识库的连接,最终开发出了压铸模具专家系统。     

砂型铸造模具的设计与工艺研究

模具是铸造成型过程中必不可少的工艺装备,是铸造生产的关键要素。其设计思路和工艺方案关系到模具的总体质量,进而决定着铸件的最终质量。因此,对于模具的设计应引起铸造企业的高度重视。从铸造企业的角度出发,对模具的设计,尤其是模具上浇注系统的设计以及模具各部位材料的设计进行详细的研究,以期能为模具制造前的设计工作提供参考价值。     

Investigation of the effects of process parameters on the glass-to-mold sticking force during precision glass molding

Compression glass molding is a promising manufacturing process for high precision, low cost glass optical elements. However, the conditions during glass molding are known to cause sticking between the glass workpiece and the mold surface. Materials for glass molds need to have high hardness and heat resistance, therefore cemented carbide or ceramics are often used. To mitigate the adhesion problem, a thin coating layer of inert materials is deposited on the mold surface. In this research, two different coatings, Pt-Ir and TiAlN, were applied to both tungsten carbide and silicon wafer substrates and then tested in a real molding environment. Experiments based on the design of experiment or DOE revealed factors which significantly affect the sticking force under the described forming conditions including compression hold time, cooling time and compression force. The morphology of the coatings in this research was also carefully investigated using white light interferometry and scanning electron microscopy. The methodology developed in this research can be readily applied to quantitatively test the effectiveness of different thin film coatings thus providing the optics industry a solution for high performance molding process design. Results on both WC-Co and silicon substrates also support the notion that different engineering materials can be used for mold fabrication if proper coating is applied.     

基于UG的注塑模CAD系统的研发与应用

在研究UG二次开发及UG/Mold Wizard构造方法的基础上,基于UG研究开发了产品及其注塑模具CAD系统,建立模架及其标准件库管理模块,生成零件的模型库。给出了注塑模CAD模块的总体设计流程,该系统可以有效地提高模具设计和制造的自动化水平。