An Architecture of Computer Aided Process Planning System Integrated with Scheduling Using Decision Support System

Process planning and scheduling are two major plann in g and control activities that consume significant part of the lead-time, theref ore all attempts are being made to reduce lead-time by automating them. Compute r Aided Process Planning (CAPP) is a step in this direction. Most of the existin g CAPP systems do not consider scheduling while generating a process plan. Sched uling is done separately after the process plan has been generated and therefore , it is possible that a process plan so generated is either not optimal or feasi ble from scheduling point of view. As process plans are generated without consid eration of job shop status, many problems arise within the manufacturing environ ment. Investigations have shown that 20%～30% of all process plans generated are not valid and have to be altered or suffer production delays when production sta rts. There is thus a major need for integration of scheduling with computer aide d process planning for generating more realistic process plans. In doing so, eff iciency of the manufacturing system as a whole is expected to improve. Decision support system performs many functions such as selection of machine too ls, cutting tools, sequencing of operations, determination of optimum cutting pa rameters and checking availability of machine tool before allocating any operati on to a machine tool. The process of transforming component data, process capabi lity and decision rules into computer readable format is still a major obstacle. This paper proposes architecture of a system, which integrates computer aided p rocess-planning system with scheduling using decision support system. A decisio n support system can be defined as " an interactive system that provides the use rs with easy access to decision models in order to support semi-structured or u nstructured decision making tasks".

Case Based Reasoning Intelligent System for Network Computer Aided Process Planning

Computer aided process planning system played a key role for integrating design and manufacturing or assembly systems properly considering available resources and design constraints.To take advantage of the enterprise resource,the web CAPP framework was established.Case based reasoning and multi agent system were integrated in the system.The multi agent mecha- nism was discussed in the paper.And an instance of case base was introduced.They made the system run independently and contin- uously in the network environment of process planning problems.

A Novel CAPP System Based on SML for Variant Design of Process Planning

The production model of“multi-specification and low-quantity”is becoming the main trend of manufacturing industry.As a key activity in the manufacturing chain,traditional computer aided process planning(CAPP)system fails to adapt to the production model of customization.Therefore,a novel method for variant design of process planning was proposed to develop CAPP system based on Tabular Layouts of Article Characteristics(Sach-Merk Leisten in German and SML for short). With the support of standard database of master process planning documents which are developed by parameterization technique, and instance process planning for special product(instance product)can be generated automatically by the sub-system of variant de- sign of process planning.Finally,a CAPP system was developed for process design of rotor of steam turbine to validate the feasibil- ity and applicability of the method.

Computer Aided Process Planning Expert System for Die Forging

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MULTI-AGENT COMPUTER AIDED ASSEMBLY PROCESS PLANNING SYSTEM FOR SHIP HULL

A multi agent computer aided assembly process planning system (MCAAPP) for ship hull is presented. The system includes system framework, global facilitator, the macro agent structure, agent communication language, agent oriented programming language, knowledge representation and reasoning strategy. The system can produce the technological file and technological quota, which can satisfy the production needs of factory.

基于WEB的航空航天环形锻件CAPP系统开发

目的设计并实现基于B/S架构模式的航空航天环形锻件CAPP系统,提升航空航天环形锻件的工艺设计效率,保证产品工艺设计的一致性,实现环形锻件工艺设计的自动化、智能化。方法根据环形锻件工艺设计理论,结合实际生产过程中环形锻件工艺的设计要求,分析环形锻件工艺设计流程,提炼环形锻件的工艺设计规则。根据环形锻件工艺设计需求和用户需求设计环形锻件CAPP系统架构,选取C#作为系统后端开发语言,利用HTML、CSS和JavaScript技术开发系统界面。选用SQL Server开发系统数据库,配合MVC框架进行CAPP系统各功能模块的开发。结果设计并实现了环形锻件CAPP系统,系统包含工艺编制、环件信息管理、知识库管理、用户管理4个系统功能模块。在工艺编制模块中导入新增环件信息后可以选择基于规则或基于机器学习2种设计模式进行环形锻件的工艺编制,能够自动生成标准化工艺卡片,与人工设计相比,工艺设计时间缩短了90%。结论环形锻件CAPP系统具备良好的环形锻件工艺设计能力,能够显著提高环形锻件的工艺设计效率及一致性。

Development of CAPP System for Small and Medium Size Apparel Enterprises

Existing computer-aided process planning (CAPP) systems for garment manufacturing emphasize all-purpose ones, lack of specialism and availability. So, few developed is popular in the garment industries. This study is intended for developing a CAPP system, which aims at the actual condition of process planning in the small and medium size apparel enterprises (SMAs). It enables the technologists of process planning to be quicker in generating suitable plans that are similar to existing styles or new. It also automatically provides labor cost by considering the shop-floor conditions. Process planning is achieved by adopting the Hybrid Interactive-variant process planning method. The proposed system has been realized in Borland Delphi 7 and Oracle 8. For validation of the system, the software has been implemented successfully in a firm named Jingchen in China.

Feature Based Machining Process Planning Modeling and Integration for Life Cycle Engineering

Machining process data is the core of computer aided process planning application systems.It is also provides essen- tial content for product life cycle engineering.The character of CAPP that supports product LCE and virtual manufacturing is an- alyzed.The structure and content of machining process data concerning green manufacturing is also examined.A logic model of Machining Process Data has been built based on an object oriented approach,using UML technology and a physical model of machin- ing process data that utilizes XML technology.To realize the integration of design and process,an approach based on graph-based volume decomposition was apposed.Instead,to solve the problem of generation in the machining process,case-based reasoning and rule-based reasoning have been applied synthetically.Finally,the integration framework and interface that deal with the CAPP integration with CAD,CAM,PDM,and ERP are discussed.

Research on Parametric Process Planning Technology Based on Three-dimensional Part Model

CAPP(Computer Aided Process Planning) has already become the bottleneck of CAD/CAM system.Present two- dimensional CAPP system which is used in the enterprise needs to be input information and data again,because it can not draw data from CAD(Computer Aided Design) model automatically after building CAD model and drawing.This has influenced extensive use of CAPP system because of its low efficiency.In this paper,three-dimensional model is built by using the parametric method, the process file cart be produced directly through drawing corresponding characteristic and parameter from the model with the aid of process database.This improves the efficiency of product development.Visual C++6.0 and SQL Server 2000 are used to devel- op WTJDCAPP prototype system based on component model and SolidWorks three-dimensional CAD platform.Engine valve-seat is taken as concrete object to validate of the technology.

THCAPP: Computer Aided Process Planning System in an Integrated Environment

THCAPP is a computer aided process planning system for non-rotational parts which runs in a CIMS (computer integrated manufacturing system ) environment at Tsinghua University. Its architecture is described in this paper. Then its main functions and key techniques, including part modeling, generative process planning and integration with CAD (computer aided design) and CAM (computer aided manufacturing) ale discussed in detail.

智能化CAPP系统的工艺决策

提出了智能化CAPP(computer aided process planning)中工艺决策模块的构造方法及知识库与推理机的实现。工艺决策模块使用OPS(official production system)作为专家系统工具,把基于规则的知识表示语言与过程语言结合起来,使过程化知识的规则表示变得容易,进而通过使用产生式规则构建知识库,采用演绎推理式的推理机,实现了一系列的工艺决策。

CIM环境下CAPP的研究与实践

通过对我国ＣＩＭＳＭＲ中的两个集成化ＣＡＰＰ系统──ＮＰＵＲＣＡＰ和ＦＡ－ＣＡＰＰ进行对比，对基于特征的零件模型、ＣＡＤ／ＣＡＰＰ／ＣＡＭ集成、ＣＡＰＰ同其它ＣＩＭ子系统的集成、工艺决策专家系统、工艺决策方法、工艺知识表示、工艺知识库技术等问题进行了研究，同时，提出了加工元（ＭＥ）概念，并把该概念用于零件的工艺性分析，以实现面向制造的设计（ＤＦＭ）和工艺决策的模型化、算法化．此外，也对工艺过程的动态优化问题进行了初步研究，为并行工程（ＣＥ）下的ＣＡＰＰ集成化研究提供基础．

CAPP系统开发工具的设计方法

在深入分析了ＣＡＰＰ系统开发工具的特点与设计要求后，提出一种“工艺功能配置型”ＣＡＰＰ系统开发工具实现模式，它吸取了外壳型、模块组合型以及语言型专家系统工具的合理特性．简要介绍了以此为基础开发的ＢＨＰＰＴ工具系统．

基于PDM的定制化CAPP系统研究和开发

随着市场需求的变化 ,传统的 CAPP系统已经很难满足用户的需求 ,定制化 CAPP系统已成为发展趋势。本文探讨了定制化 CAPP系统的设计思想和实现方法 ,并结合一个实际系统从工艺数据结构、工艺卡片、工艺工作流程等方面讨论了基于 PDM的定制化

CAPP与PPC集成研究现状与进展

评述了ＣＡＰＰ与ＰＰＣ集成的研究现状及进展．从方法、模型、决策算法、工艺表示和数据建模等五个方面对ＣＡＰＰ与ＰＰＣ的集成进行阐述，指出了存在的问题以及解决问题的可能思路和途径．提出了ＣＡＰＰ和ＰＰＣ的集成与工厂控制结构设计相结合的研究方法，并指出进一步的工作将是更全面地考虑到来自ＣＡＤ、ＣＡＱ和ＣＡＭ的影响，使从产品设计到产品生产整个过程尽可能协同优化地工作．

STEP-CAPP系统中的非线性工艺设计和工艺优化技术

介绍了STEP-NC应用环境下计算机辅助工艺设计系统的非线性工艺设计的方法和过程,以及如何进行工步序列的有效化。提出了基于精英选择策略遗传算法的工艺优化技术,详细研究了遗传算法在工艺优化中的应用过程。开发了一个STEP-CAPP原型系统,并通过一个实例零件对所提技术和算法进行了演示和仿真,结果表明了该技术和算法的可行性和有效性。

基于轻量化三维模型的CAD/CAPP/CNC系统集成技术研究

针对CAD、CAPP、CAM及CNC系统间共享和交换三维模型信息瓶颈问题,在综合分析各系统的不同功能及对三维模型信息需求的基础上,依据轻量化三维模型标准,建立了基于轻量化三维模型的系统集成信息模型,并在此基础上构建了基于轻量化三维模型的CAD/CAPP/CNC集成系统,实现了各系统间共享和交换三维模型信息的目的。对系统集成信息模型、基于轻量化三维模型的制造特征转换等关键技术进行了详细的研究,并通过实例验证了方法的可行性和有效性。

面向并行工程的CAD/CAPP/PPS集成研究

应用并行工程的思想 ,在对传统串行 CAD、CAPP及 PPS过程进行详细分析细化的基础上进行并行化重组 ,给出了 CAD/ CA PP/ PPS集成化过程模型 ,并分别对基于 PDM的 CAD/ CAPP集成和基于动态资源管理的CA PP/ PPS集成进行研究。本文的研究思想在国家 86 3计划南京金城集团 CIMS二期并行工程实施中得到应用 。

基于Web分布式网络CAPP系统的开发

为满足工艺设计的协同工作、知识积累和快速复用的实际需求 ,在总结网络数据库查询方法的基础上 ,提出分布式网络 CAPP系统结构 ,包括数据层、数据处理层、表达层和应用层 ;论述了系统的主要功能和基于

CAPP系统中的模糊匹配方法

CAPP系统中的实例匹配是有效利用现有工艺知识和专家经验的最佳途径 .根据模糊数学原理 ,分析了工艺规程形成过程中各属性因素的影响 ,在建立模糊匹配模型时 ,从工艺条件中提取能区分和识别工艺实例的特征向量 ,确定了各属性因素的隶属函数 ,计算中增加隶属函数的权重因子 ,并给出其算例 .该方法在SMCAPP系统中得到应用 .