基于数据挖掘的工艺规则提取

CAPP系统在进行工艺设计时会产生大量数据，如何充分利用历史数据始终是一个技术难题。为此提出采用数据挖掘技术提取工艺规则，研究了关联规则和序列模式的定义和挖掘过程，通过实例给出数据挖掘的应用。应用表明该方法能有效提高CAPP系统的应用效率，缩短产品的开发周期，对于实现工艺设计自动化具有重要意义。     

成组技术在CAPP中的研究与应用

论述成组技术的基本概念及在CAPP中采用成组技术的原因,讨论如何通过使用规则引擎达到根据不同企业的分类规则进行灵活配置的目的,给出成组工艺设计在CAPP中的基本应用过程及其相应的流程图,分析影响成组技术实施的一些因素。     

基于Web Service和工作流技术的CAPP系统研究

针对目前CAPP系统存在的难以解决的集成化与可重构问题,提出一种基于Web Service技术和工作流技术的CAPP系统解决方案,成功实现了工艺设计流程的自动化、系统重组与系统集成。详细阐述了Web Service和工作流技术相结合的CAPP系统三层分布式体系结构、功能结构以及基于知识规则的工艺智能化生成的推理机制。重点介绍了Web Service技术在CAPP系统集成中的应用与实现机制,以及工作流技术在工艺设计流程管理中的应用。     

零件编码结合规则库在工艺决策中的应用

零件信息的描述和工艺决策是计算机辅助工艺设计系统(CAPP)的两个难点和重点.对零件信息进行分类、编码,把熟练工人的加工方法和经验做成规则库,并设计出一个工艺辅助设计系统.通过实例证明,能有效解决这两个难题.     

压力容器铆接CAPP软件的研究与设计

对现有压力容器铆接CAPP软件进行分析,介绍了压力容器铆接CAPP的设计与实现方法。该系统通过对典型工艺的检索和系统自身决策规则,辅助工艺人员编写各种工艺卡片以及进行工艺管理,大大提高了工艺人员的工作效率。     

基于数据挖掘和面向对象技术的CAPP工艺知识模型的研究

计算机辅助工艺设计(CAPP)的应用提高了工艺设计的效率,然而由于缺乏完整的工艺知识体系,现有的CAPP技术不能满足企业对智能化的需求。为此提出了基于数据挖掘的获取工艺知识的思想,以及基于面向对象技术的知识表达方法,并对工艺知识的获取、表达建立了体系模型。这种模型可以继承企业已有的工艺过程,并具有一定的通用性。     

面向全球制造的工艺设计与中英文翻译系统开发研究

全球制造策略要求工艺文件能用多种语言来表示以便于交流 ,而目前的 CAPP只能生成单一语言表示的工艺文件 ,因此 ,中英文工艺设计与翻译系统的开发是非常必要的。本文分析了 CAPP系统、机器翻译的研究应用现状和对工艺设计与中英文翻译系统需求 ,研究了工艺设计与中英文翻译系统的功能、总体结构与关键技术的实现方法 ,提出了用带有形式变量的工艺语句模板来实现工艺语句的规范化 ,以基于工艺语句模板的直译式翻译法为主、以基于语法规则的翻译法为辅的方法来实现的工艺文件翻译。在此基础上 ,结合航空制造业对外合作研制的需要 ,开发了一个航空工艺文件编制与中英文机器翻译系统 ,该系统己投入了实际应用     

大型锻件CAPP系统开发及应用研究

本文针对大锻件工艺设计的复杂性、特殊性以及传统手工设计方法的缺点,对大型锻件CAPP系统的关键技术进行了研究与分析,设计了锻造CAPP系统结构和模块功能,并分析了计算机辅助工艺设计系统在锻造工艺中的应用。研究表明,CAPP系统对大型锻件的加工制造起着重要的指导作用。     

基于产品的CAPP的方法研究

从工艺工作领域考察,提出基于产品的CAPP概念和面向产品的CAPP概念;分析了企业工艺设计和工艺管理中存在的主要问题;阐述了基于产品的CAPP的内涵;提出基于产品的CAPP实现策略和工艺信息集成模型,阐述了相对应的CAPP系统的基本功能;回顾了基于产品的CAPP系统当前的开发和应用情况。最后,开发了相应的原型系统。     

国内企业应用CAPP技术的现状

目前,大部分企业对CAPP系统的应用情况并不令人乐观,企业应用CAPP系统最具代表性的情况有如下几种:(1)大部分企业的工艺设计仍然采用手工设计的方式,CAPP的应用仍是空白。较偏远地区的企业,特别是那些中小企业,不光CAPP的应用是一片空白,计算机的应用状况也令人担忧。(2)部分企业在计算机技术和CAD的应用较为普及以后,工艺设计成为企业的薄弱环节。有些企业自己在Word、Excel或AutoCAD上绘制出工艺卡片的空白表格,在此基础上进行工艺规程的设计。此种设计方式也是利用计算机进行辅助工艺设计,因此,也可称做CAPP,但此类CAPP所…     

基于XML的工艺文件汉英翻译研究

经济全球化要求CAPP支持远程设计和产品数据共享,传统的CAPP系统只支持本地设计,生成的工艺文件是单一语言的,通用翻译软件又不能直接被CAPP系统所使用,因此对开发基于B/S结构的工艺设计和计算机辅助翻译软件提出需求.在分析了工艺语言特点的基础上,为提高基于网络的工艺语言翻译品质,提出利用XML文档进行工艺文件的结构化信息表示和信息的传递与交换,最后对机械加工工序卡的XML结构化表示做了详细说明.     

冷挤压工艺规划的发展及原型系统研究

介绍冷挤压工艺规划的研究现状,分析其发展趋势,提出一基于特征的集成ＣＡＤ／ＣＡＰＰ＝ＣＡＥ和优化技术的冷挤压工艺规划原型系统,并对基于特征的产品模型建立、可行性分析、工艺规划和工艺评价及优化等关键技术进行分析。原型系统的建立为实现集成ＣＡＤ／ＣＡＰＰ／ＣＡＥ和优化技术的冷挤压工艺规划系统奠定了基础。     

Computer-aided process planning for NC tool path generation of complex shoe molds

This paper presents a computer aided process planning (CAPP) system for numerical control tool path generation of complex shoe molds. This CAPP system includes both the automation of auxiliary boundary curve generation and machining strategies. The automation of auxiliary boundary curve generation and machining strategies make tool path generation more accurately and efficiently. Traditional shoe mold making is a very tedious process. Even with the utilization of computer-aided design and computer-aided manufacturing (CAD/CAM), the CAM process requires long hours of tool path programming and debugging. It would also take a long time to calculate (sometimes several hours) the tool path for complex athletic footwear. In order to reduce the tool path editing and programming time, this paper proposes the use of CAPP to reduce processing time and increase efficiency. It is difficult, if not impossible, to develop a generic CAPP system that can generate a process plan to solve general production problems. However, it is quite possible to capture the domain knowledge of a certain production process and embed that knowledge into a CAPP system. We prove, by using such a system, that a very complicated process planning problem can be overcome by a knowledge-based CAPP approach. With such an approach, the traditional manufacturing process of shoe molds can be converted to an automatic manufacturing process with the CAPP system. In fact, shoe molds for real production have been created using the developed CAPP system, demonstrating the effectiveness of this approach. In this paper, we show that several complex and different shoe molds and their machining strategies were automatically planned by the proposed CAPP system. The result of a comparison between the CAPP system with the traditional approach is presented and discussed.     

Development of a computer-integrated system to support CAD to CAPP

During the 1990s, Computer-Aided Design (CAD) and Computer-Aided Process Planning (CAPP) have emerged as effective means of improving productivity and efficiency, resulting in widespread research work related to CAD and CAPP integration in the hope of achieving seamless data flow among the relevant computer systems. Unfortunately, the efficiency of process planning systems still needs significant improvement due to the problems of design data loss or design data mis-interpretation. This paper attempts to introduce an intelligent computer-integrated system for reliable design feature recognition in order to achieve automatic process planning. Moreover, it describes a rule-based computer-integrated system for recognizing features of components stored as STEP format, analyzing the design files and designing manufacturing processes. In this approach, the STEP design file is used as the information source for generating detailed manufacturing process. The significance of this research is that the product designs with dissimilar formats from various CAD systems can now be interconnected and automatically coded for multiple manufacturing purposes. It presents an effective method that rule-based reasoning is used to create optimal process plans for metal cutting.     

基于PDM系统的CAPP集成技术的研究

探讨了PDM与CAPP在产品结构管理、用户信息管理、工艺设计管理、工艺审批管理、数据存储管理等5个方面的系统集成问题。系统集成采用以单一产品数据为核心,以功能集成和数据集成为基础的集成方式,以PDM作为系统集成的平台,CAPP作为工艺文件编制和工艺数据操作的运行环境,不仅保持了数据和用户操作上的一致性,还保留了PDM和CAPP系统各自强大的专业功能,是一种实现简单但集成度较高的集成。     

Workpiece modelling for computer-aided process planning

Different concepts can be applied for representation of workpiece data for CAPP. Instead of waiting for future standards, a practical method is required, which can be used for actual workpieces or those that have been designed in the past by using already existing CAD systems. Therefore, for developing the CAPP system an approach has been chosen which consists of (1) a structure and geometry recognition of the workpiece and (2) an editor for technological data.This paper shows the main characteristics of a workpiece model which can be used for process planning. The results of an analysis of workpieces in industry give an overview of the topological relationships between geometrical elements which is an essential part of workpiece modelling for future design and planning systems. Also, a link between the workpiece model and the CAPP system is presented and briefly discussed.     

An Integrated Design and CAPP System for Deep Drawing or Blanking Products

This paper deals with an automated computer-aided process planning system by which designers can determine operation sequences even if they have little experience in the process planning of sheet metal products by press working. The computer- aided process planning program written in AutoLISP for the AutoCAD using a personal computer, for deep drawing or blanking, requires many kinds of technical and empirical skills. The approach to structure of the system is based on knowledge-based rules, and a process knowledge base consisting of design rules is built. Based on the investigation and collection of knowledge about the processes, the methodology adopted to develop this system is described in this paper. An attempt is made to link programs incorporating a number of expert design rules to form a useful package for process planing. This integrated design and CAPP system is composed of two main modules and six submodules. It is designed considering several factors, such as the complexities of blank geometry, punch and die profiles, the availability of a press equipment, and standard parts. Results obtained using the modules enable the designer and manufacturer of deep drawing or blanking dies to be more efficient in this field.     

A Surface Area Calculation and CAPP System for Non-Axisymmetric Deep Drawing Products

In this paper a surface area calculation for non-axisymmetric deep drawing products of elliptical shape was constructed for the design of blank shapes of deep drawing products by using an AutoLISP function in AutoCAD software. A computer-aided process planning (CAPP) system for rotationally symmetric deep drawing products has been developed. In this study, a CAPP system for non-axisymmetric deep drawing products of elliptical shape was constructed using process sequence design. The system developed consists of four modules. The first is the recognition of shape module for recognising non-axisymmetric products. The second is a 3D modelling module for calculating the surface area for non-axisymmetric products. The third is a blank design module for creating an oval-shaped blank with an identical surface area. The fourth is a process planning module based on production rules that play the most important role in an expert system for manufacturing. The production rules are generated and upgraded by interviewing field engineers. The drawing coefficient, the punch and die radii for elliptical shape products are considered as the main design parameters. The suitability of this system was verified by applying it to a real deep drawing product. This surface area calculation and CAPP system should be very useful for reducing the lead-time for manufacturing and for improving the accuracy of products.     

实例检索策略及其在减速器零件CAPP中的应用

针对ＣＡＰＰ中实例零件的相似性检索，从加工工艺的角度出发，提出了基于加工特征和进刀方向的相似性判定准则以及三级搜索策略，提高了实例匹配的准确性，使实例工艺的重要性增强。该方法已应用到所开发的减速器主要零件通用型ＣＡＰＰ系统，该系统将派生式和基于实例方法集成一体，既具有派生式适应性强的优点，又充分利用了以往成熟的工艺实例。