基于遗传算法的事例改写策略在注塑模成本评估CBR系统中的应用研究

注塑模成本评估是一个涉及多方面合作的问题，将基于事例的推理(CBR)技术用于注塑模成本评估过程中。针对成本评估过程中的弱理论性，提出基于遗传算法的事例改写策略。提出了算珐的关键技术，并提出了利用三级模式事例改写模型，构造合适的适配值函数，未解决注塑模成本评估CBR系统事例改写的原理和方法。     

三维注射模CAD系统的开发

作者在新近开发的三维注射模结构CAD系统中.以AutoCAD12.O作为图形平台,利用其高级三维实体造型功能及ADS开发语言.实现了对AutoCAD的注射模专业化改造.使得注射件尺寸向型芯、型腔尺寸的转换可自动进行,建立了注射模标准零件库及抽芯机构结构图库,开发了标准模架组合装配程序.实现了模架装配及其在注射成型过程中的运动模拟.并能形成二维工程图.     

基于报价决策的冲压件成本分析CBR技术研究

通过对冲压件产品报价过程及 CBR技术的分析 ,提出了一个冲压件报价决策框架。将 CBR技术引入冲压件报价决策系统 ,用于对相似产品的成本分析。在文中给出了相应的事例表示与检索方法 ,并提出了相似度系数的计算公式     

注塑模CBR设计决策系统中利用神经网络方法进行事例检索的研究

注塑模 CBR(基于事例的推理 )系统是借助于历史经验来指导设计决策的。在系统中 ,求解事物的相似性是最重要的一环。本文探讨了利用神经网络方法进行事例检索的途径 ,通过对 CBR系统中输入条件的编码 ,经过对神经网络的样本训练 ,最近邻法调整和人类专家调整 ,得出求解事例相似性的神经网络结构。利用此方法 ,可以对后续设计步骤提供了很好的指导     

基于本体的注塑模改模知识表达与推理研究

改模知识存在描述不规范的问题,并需要从大量改模数据中推理出改模知识。在分析改模知识的基础上,提出了一种基于本体的多层知识表达与推理模型。借鉴现有的本体构建方法,定义了本体的概念、属性、关系、实例;建立了基于单层的改模知识推理规则和多层之间的改模知识推理规则,并设计了相应的推理算法。通过一个基于“批锋”缺陷的改模问题验证了基于本体的改模知识多层知识模型及其规则的正确性与可行性。     

An Interactive Knowledge-Based CAD System For Mould Design in Injection Moulding Processes

This paper presents a practical prototype knowledge-based system, called IKMOULD, for mould design in the injection moulding process. It attempts to tackle the problem in a practical and integrative way, unlike the stand-alone and mathematical programs which have been developed in the past to solve only a part of the problem. A total quantitative and structured approach is not feasible in dealing with the complex and multirelated design problems generally involved in mould design. In this system, the computational module, the knowledge-based module and the graphic module for generating mould features are integrated within an interactive CAD-based framework. The knowledge base of the system can be accessed by mould designers through interactive programs so that their own intelligence and experience can also be incorporated with the total mould design. The approach adopted both speeds up the design process and facilitates design standardisation which in turn increases the speed of mould manufacture.     

注射模的绿色设计与制造初探

将绿色制造的理念运用于注射模的设计与制造中,在介绍绿色制造的概念、内涵的基础上,介绍了注射模绿色制造的整个生命周期,包括绿色设计、绿色制造、绿色回收、再处理等,并结合注射模自身的特点,具体阐述了基于绿色制造的注射模设计与制造方法。     

Three-Dimensional Kernel Development for Injection Mould Design

Today, 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 not 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 software 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 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.     

Optimum Gate Design of FreeForm Injection Mould using the Abductive Network

This study uses the injection position and size of the gate as the major control parameters for a simulated injection-mould. Once the injection parameters (gate size and gate position) are given, the product performance (deformation) can be accurately predicted by the abductive network developed. To avoid the numerous influencing factors, first the part-line of the parameter equation is created by an abductive network to limit the range of the gate. The optimal injection parameters can be searched for by a simulation annealing (SA) optimisation algorithm, with a performance index, to obtain a perfect part. The major purpose is searching for the optimal gate location on the part-surface, and minimising the air-trap and deformation after part formation. This study also uses a practical example which has been and proved by experiment to achieve a satisfactory result.     

基于知识的小型注塑模具快速设计系统的研究

针对注塑模设计与制造过程的自动化、智能化及效率高的要求,基于Unigraphics软件的二次开发平台,开发了基于知识的注塑模结构设计CAD系统.提出了该系统的整体结构框架、模块划分和数据流程,建立了知识库,分析了各模块功能的实现.     

基于特征的注塑模智能浇注设计系统的研究

为提高注塑模设计的效率和质量 ,本文首先引入了一种新的塑件几何特征分类方法 ,在此基础上结合 CBR和 RBR技术提出了一种混合型智能系统来实现注塑模浇注系统的智能设计 ,并对其中的技术关键点和实现原理进行了研究     

An Intelligent Knowledge-Based System for Product Cost Modelling

An intelligent knowledge-based system for product cost modellingis presented in this paper. The developed system has the capability of selecting a material, as well as machining processes and parameters based on a set of design and production parameters; and of estimating the product cost throughout the entire product development cycle including assembly cost. The proposed system is applied without the need for detailed design information, so that it can be used at an early design stage, and, consequently, redesign cost and longer lead time can be avoided. Hybrid knowledge representation techniques, such as production rules, frame and object oriented are employed to represent manufacturing knowledge. Fuzzy logic-based knowledge representation is applied to deal with uncertainty in the knowledge of cost model to generate reliable cost estimation. This paper deals with cost modelling of both a machining component and an injection moulding component, which is a process that gives high production rates, excellent quality and accuracy of products, and low manufacturing cost. Based on the analysis of the moulded product life cycle, a computer-based cost model was developed which integrated the relationship between cost factors, product development activities, and product geometry. The estimated cost included the costs of material, mould and processing. The system has been validated through a case study.     

电话机面壳注射模具CAD/CAE/CAM关键技术研究

模具的CAD/CAE/CAM是一项重要的模具先进制造技术。借助于该技术,可以实现模具方案的分析、优化和模具设计,缩短模具的制造周期和提高产品质量;可以对产品的成型、注射工艺参数、相应的模具结构和模具的制造工艺进行设计和优化。电话机面壳属于较薄、形状复杂和表面粗糙度要求较高的塑件。首先,在模具结构设计前应进行方案的分析,选择比较合理的浇注系统和冷却系统方案;其次,在方案分析的基础上,设计模具结构;最后,导入产品实体造型,用Mastercam数控铣床加工,在软件环境内可模拟加工,及时发现工艺失误。     

基于产品族结构树的定制产品成本估算方法

针对现有的面向大规模定制的产品成本估算方法存在的缺陷和不足,提出了基于产品族结构树的定制产品成本估算方法。该方法是在产品族结构树的基础上将定制产品划分为公共零部件和个性化零部件,个性化零部件进一步分为标准件、外协件、相似件和新零件,针对不同性质的零件采用不同的成本估算方法。因此,定制产品成本估算的关键在于相似件和新零件的成本估算,其中,相似件采用基于实例的推理技术依据相似实例的成本进行估算,新零件采用基于特征的方法计算,最终确定定制产品的总成本。最后以MK2110内圆磨床为例,开发了包括成本估算功能的产品定制设计原型系统,验证了该方法的合理性。     

模具高速铣削加工应用及关键技术

摘 介绍了高速铣削技术的工艺特点及其应用在模具制造中的优势。并从机床、刀具、CAM系统和工艺技术等方面,对高速铣削应用于模具制造中的关键技术进行了分析探讨。     

注塑产品及其模具快速设计系统的研究

根据注塑产品及其模具设计制造的特点,阐述了以 Pro/E、EM X4.1为主线的产品及模具设计平台,为模具设计系统提供了一条快速而有效的途径。     

基于解释器技术的注塑模CAD系统研究

针对传统泣塑模CAD系统的缺陷，提出并分析了新型注塑模系统的总体设计方案和3DMCAD／CAM系统构建语言，由此实现了柔性化注塑模CAD系统，包括模架、抽芯机构、浇口套等机构及其孔型的信息获取、自动生成、更新和删除。     

基于Pro/E和MasterCAM的注射模CAD/CAM应用研究

简要介绍了注射模的CAD/CAM设计思路,通过实例用Pro/E软件对塑件进行了注射模具设计,得到了模具成型零部件,并重点阐述了其设计流程,然后运用MasterCAM软件对该塑件的型芯进行了加工刀路设计,模拟其加工过程,生成了NC代码。将2者结合使用,可显著提高模具设计及数控加工的质量和效率。     

基于UG的典型注塑模仁数控编程方法研究

以UG为辅助编程工具,分析典型注塑模仁的工艺特点,制定了适合模仁数控铣削加工的自动编程工艺方案,并对刀路的优化方法进行了详细说明,对此类模仁的数控加工提供了借鉴和参考,有很好的实用价值.     

A Branch and Bound Algorithm Based Process-Planning System for Plastic Injection Mould Bases

This paper describes the use of artificial intelligence in the process planning of plastic injection mould bases. The computer- aided process-planning system, developed for IMOLD? will extract and identify the operations required for machining. These operations are considered together with their precedence constraints and the available machines before the process plan for the mould base plate is generated. The process plan is optimised by a branch and bound based algorithm. Overall machining time has been proposed as the objective function for optimisation. The ability of this algorithm to search intelli-gently for a feasible optimised solution is illustrated by an industrial case study. A brief comparison with a genetic algor-ithm based process planning system is also made. The result of this development will allow users to optimise process plans easily for any given mould base, with options to suit dynamic changes on the manufacturing shop floor.