Incorporated tool selection system using object technology

Tool selection is perhaps one of the most important functions in a process planning system because the selection of a tool affects the selection of machining parameters, jig and fixture selection, production rate, cost of the product, and the resulting accuracy. Therefore computer-aided tool selection (CATS) is an essential element within a computer-aided process planning (CAPP) system (C. Koulamas, Tool requirements in multi-level machining systems, International Journal of Production Research, 29 (2) (1991) 417–437.), and in turn in a Computer Integrated Manufacturing (CIM) environment. This paper proposes an object–oriented methodology for selecting the tooling parameters for parts in a CIM environment. As this system can be incorporated into both static and dynamic process planning systems, it is termed as Incorporated Tool Selection Systems (ITSS). The steps of the methodology are discussed in detail, together with an example.     

Computer aided manufacturability analysis: Closing the knowledge gap between the designer and the manufacturer

Manufacturing today is marked by increased competition and dispersed global organization, thus necessitating enhanced collaboration among designers and manufacturers. Nevertheless, while Design for Manufacturability (DFM) has been the subject of in-depth research over the past decades, the supporting software solutions have not as yet matured. In this paper we present a holistic approach and supporting software tool, termed the Computer Aided Manufacturability Analysis (CAMA) tool, for capitalizing on available manufacturability knowledge. This is achieved by closing the knowledge loop between the design and manufacturing environments. CAMA captures the knowledge in a structured manner and incorporates this knowledge within the product design tools (CAD systems), thus enabling improved product timeliness and profitability. CAMA represents proof of concept and constitutes a demonstrative prototype of an adaptive and open DFX tool. It is based on industrial surveys of the Knowledge, Information and Data (KID) flows in CAD, CAPP and CAM processes within the manufacturing outsourcing environment. CAMA differs from other approaches in that it is an open system that enables continuous and intuitive capture, modification and implementation of updated manufacturability KID.     

冲压件CAPP系统的压机自动选择方法研究

工艺决策是CAPP系统的核心，它包括工艺规划和工序设计两方面的内容。工序设计是零件设计信息与设备加工能力信息相匹配的过程，现有的CAPP应用系统通常是提供一个操作界面由人工选择设备，不仅效率低，而且受到操作者实际经验的制约。本文结合作者开发的冲压件CAPP系统，介绍了加工设备自动选择的实现方法。     

基于典型工艺模型的半创成式汽车底盘零件CAPP系统

文章根据集成化和实用化的设计思想,针对汽车产品零件系列化、标准化程度较高,且以大批量流水线生产为主等特点,提出了一种典型工艺模型,并在此基础上建立并开发了以典型工艺派生为主,以局部创成为辅的集成化系统.介绍了系统的过程模型,重点论述了所提出的典型工艺模型及半创成式工艺设计方法,并给出了应用实例.     

计算机辅助焊接工艺设计应用现状

计算机辅助工艺设计（CAPP）是提高设计效率和工业生产率的理想工具，是联系CAD与CAM的纽带，也是实现计算机集成制造的关键因素之一，本文简要概拓了计算机辅助工艺设计（CAPP）的分类特点及发展趋势，在此基础上较详细地回顾了国内焊接工艺计算机辅助设计系统的发展历史，并针对焊接领域新一代CAPP应具备的功能作了简要总结。     

Facility Layout Planning Using Self-Organization Method

This paper proposes a novel approach to facility layout planning based on the concept of biological manufacturing systems that deal with the inherent complexity of manufacturing using ideas of self-organization, evolution and learning. A self-organization method is proposed to generate facility layout plans autonomously according to the material flow which emerges from the local interactions among production elements. A case study of facility layout planning is presented for semiconductor manufacturing, in which it is difficult to find a proper layout because of complex process flow. The effectiveness of the proposed method is discussed in terms of the accumulated traveling distance of products and the throughput.     

A decision support system for optimising the selection of parameters when planning milling operations

The paper focuses on the problem of choosing the manufacturing route in metal removal processes, a highly important element in computer aided process planning (CAPP) systems. At present, decisions concerning the cutting parameters used in metal removal operations are based on experience.The object of this work has been to design a system to help select the parameters in the cutting process in the case of milling. The algorithm is based on optimising the cost of the operation. The result is the selection of parameters that take into account all the existing restrictive factors (material, geometry, roughness, machine and tool).A wide range of parts have been evaluated, using group technology in order to choose representative cases. We compared the results of our system with the values proposed in the reference manuals. The experiment has served to determine the different relationships between the factors that have an influence on milling operations and the features which allow us to take into account the wide range of geometrical possibilities existing for all the pieces we studied.Applying our method helps to make the right decisions on the optimal parameters in mill operations as applied to the machining processes, and, in our experiments, leads to a reduction of about 35% in processing times while ensuring optimal finishing conditions.     

车身覆盖件模具工艺设计与网络计划集成系统研究

分析了车身覆盖件模具生产的特点及其对计算机辅助工艺设计与网络计划的需求，对模具工艺设计与网络计划的工作模式进行了研究，采用柔性化工艺设计方法，实现了工艺设计与时间优化基础上的网络计划的集成。     

纵切数控车床交互式CAPP系统的设计

针对纵切数控车床工艺设计灵活多变、工艺人员经验不可替代的特点,设计了纵切数控车床交互式CAPP系统.工艺设计中,用户决定加工方法的选择、加工顺序的安排、刀具的选择和加工参数的确定这些经验性强、灵活多变的部分;系统则提供辅助的工具方便用户决策,并根据用户输入的参数,调用系统内部的算法自动地生成刀具轨迹.交互式CAPP系统将人的经验和计算机的计算能力结合起来,具有很好的实用性和灵活性.     

支持并行工程和智能CAPP的制造资源建模技术研究

文章在对制造资源与并行工程、制造资源和智能CAPP相互关系详细分析的基础上,基于特征建模方法的原理,提出了过程特征的概念及其属性描述.所定义的过程特征,不仅可以描述零件的信息模型,还用来建立了零件特征、加工方法、工艺数据库、刀具、量具和机床多种制造资源信息的联系模型,为智能化CAPP、CAD/CAPP集成系统以及面向制造的设计系统等开发和应用提供了技术支持.     

焊管轧辊CAD／CAPP系统的开发

介绍了计算机辅助设计（ＣＡＤ）与计算机辅助工艺设计（ＣＡＰＰ）在直缝焊管机组轧辊孔型设计、孔型加工工艺编制及ＣＡＤ／ＣＡＰＰ系统的功能、参数化设计过程、绘图环境等方面的应用实例。     

Improving decision making by simulating and visualizing geometrical variation in non-rigid assemblies

Customer demands on quality appearance as well as economical demands for shorter development time are increasing. Virtual concept verification is, therefore, becoming more and more important since an increasing number of decisions are based on digital models. This paper discusses visual quality appearance and presents the concept of geometrical and visual sensitivity along with tools for analysis and evaluation. Especially, a tool for non-rigid variation simulation and visualization is presented. It allows manufacturing and assembly deformations to be visualized with high level of realism long before any physical prototypes are being made. Different design concepts can thereby be compared in realistic environments. The quality of decisions based on digital models can thereby be improved.     

A mixed-integer linear programming model for part mix, tool allocation, and process plan selection in CNC machining centres

A mixed-integer linear programming model is developed for the simultaneous determination of part mix, tool allocation and process plan selection in CNC machining centres. Illustration of the use of the model in a hypothetical example and its application to a real problem arising in deep seabed operations demonstrate the utility of the model as one more step towards the integration of computer-aided process planning (CAPP) tasks in CNC machining enviroments.     

一种车间作业计划方法的研究

讨论了ＣＡＰＰ与车间作业计划集成的必要性，针对多品种小批量的单件生产车间提出基于多工艺方案的车间作业计划方法。在此基础上，建立了基于多工艺方案的车间生产作业计划决策系统。     

非回转体零件数控铣刀的选择

数控加工中刀具的选择除需遵循传统加工的选择规则外,还应遵循一些特殊的原则。基于MasterCAM和Vericut软件,从数控用铣刀的分类、刀具材料、工艺参数等几个方面研究数控加工中刀具选择的问题,给出刀具选择一般规则。同时考虑到软件中提供的刀具不符合车间实际的情况,提出建立刀具库的策略,可提高数控加工的编程效率,对数控技术的运用起到积极的促进作用。     

Generalized CAPP and synthetic evaluation strategy for production line of accuracy welding

This paper presents generalized CAPP （G-CAPP） method which deals with macro process planning for multiobjective in the planning stage of production line of accuracy welding （PLAW） based on the features of accuracy welding production （ AWP ）. G-CAPP offers foundations for prototype design and general equipment sorting, production capacity predication and production analysis by means of simulation and optimization. A synthetic hierarchy evaluation （SHE） model for G-CAPP established according to the planning objective is utilized to estimate the alternate processing plans by using membership function and analytic hierarchy process （AHP） of operational theory. The assembly welding line of hydraulic torque converter （HTC） is as an example of typical A WP to explicate G-CAPP and synthetic evaluating strategy of PLAW. The feasible and rational process configuration strategies of HTC assembly welding line are pointed oat under different planning objective.     

基于可制造性特征的制造资源建模

可制造性评价是缩短开发周期、优化制造工艺、降低产品成本的有效途径。产品的可制造性取决于特定制造资源的加工能力。制造资源模型的开发是可制造性评价的基础。为了更好地利用制造资源信息，提出一种模糊C均值聚类算法与遗传算法相结合的混合算法，根据制造特征对制造资源进行分组，基于制造资源约束的Object-Oriented方法建立制造资源信息模型，设计可制造性评价框架。通过对32台加工设备进行划分，使用混合算法动态确定最优分组数目和该数目下的最优分组。结果表明：混合算法可靠有效，能够提高应用企业的整体绩效，增强决策的可行性，并有利于管理层做出更明智的决策。     

重机零件CAPP系统开发工具的研究

本文论述了作者研究开发的重型机械零件CAPP智能开发工具-ZJCAPPDT,提出了基于标准构件的CAPP开发工具设计思想.并结合生产实际,给出重型机械零件CAPP系统的标准构件,这些构件可用于重型机械零件CAPP实用系统的生成.     

基于Web面向产品的综合式CAPP系统

文章介绍了一个基于Web面向产品的综合式CAPP系统,包括:采用的Microsoft Windows DNA结构,系统组成及其功能,知识处理,数据库维护和用户管理等主要内容.系统采用国内外流行的Web、XML和组件技术,建立了集交互式、检索式和基于知识的方式于一体的CAPP系统,进行面向企业产品的各类零件进行工艺设计,生成满足生产要求的工艺文件.CAPP系统运行环境为Windows2000,编程语言采用ASP 、JavaScript和VC 等,关系数据库采用Oracle.目前,系统已经应用于沈阳第一机床厂.