基于模板定制的零件工艺变型设计研究

针对传统CAPP系统对企业已有产品工艺知识重用较弱的现状,从产品工艺资源重用的角度出发,以回转类零件为例,在分析其结构特征和总结工艺特点的基础上,提出基于模板定制的方法,分别采用典型参数化工艺模板和典型实例工艺模板进行新零件工艺设计,即在工艺模板与零件之间建立参数关系,实现参数化驱动零件加工工艺。并充分利用企业中已有的成熟工艺设计方案、工艺流程以及工艺资源,以尽可能小的修改代价、尽快的速度变型出所需要的设计工艺。最后给出了实例。     

CAPP开发工具中用户框架系统的关键技术研究

CAPP开发工具是实现CAPP商品化和CAD/CAPP/CAM集成的必由之路。本文提出的CAPP开发工具由构造工具系统和用户框架系统组成。用户框架系统是在构造工具系统的基础上,用来生成零件工艺的执行工具。它主要由用户信息模板读取、零件信息获取和检查、工艺路线生成、工艺文档输出、加工信息输出等模块组成。文中分析了实现用户框架系统的关键技术,面向系统特征和用户定义特征的加工特征类定义、基于柔性工艺决策原则的工艺排序优化方法和基于零件工艺结构树的工艺信息处理方法。     

Automated Process Planning for the Manufacture of Lifters

This paper presents the methodology of a computer-aided process planning system IMOLD  FCAPP for the manufacture of injection moulded components, which will facilitate the standardisation of process planning and significantly reduce lead-time. The main components of the mould such as the slider, the lifter and the mould base are considered in this system. In this paper, the automated process planning for the manufacture of a lifter is described. A combination of the generative and variant approach (hybrid approach) is used for the development of the system. The input to the system is a 3D lifter model. First, the system classifies the lifter types and extracts the feature parameters from the model. Each lifter type refers to a standard process plan template, in which a set of processes is presented in sequence. Secondly, the system selects the machines, cutters, fixtures, and cutting parameters for each process in the plan template, based on the actual dimensions of the features and constraints and rules defined in the system and the available machining resources. The process plan execution is then simulated on the screen step by step.     

参数化零件族与参变工艺流程之间的几何关联方法

为减少零件设计与加工系统设计之间的某些中间环节，缩短产品开发周期，提出了一种在参数化零件族与参变工艺流程之间建立几何关联的方法。该方法首先对一给定的参变工艺流程确定其能够制造的零件集合，即工艺能力包集，用一串特征关系图表示流程中工件与资源的静动态关系，通过不同形式的子图匹配与合并生成能力包集中零件的特征参数模型。然后，比较能力包集和参数化零件族中的零件特征模型，在拓扑同构条件下求解它们的参数等效区域。基于等效区域，建立同时属于能力集合与零件族的零件模型，构成这两零件集合的交集。交集中的零件特征模型同时与参变工艺流程和零件族有几何参数映射关系，从而可作为连接两方面的桥梁，有利于在零件设计与工艺设计之间建立互动关系。     

An intelligent process planning system for prismatic parts using STEP features

This paper presents an intelligent process planning system using STEP features (ST-FeatCAPP) for prismatic parts. The system maps a STEP AP224 XML data file, without using a complex feature recognition process, and produces the corresponding machining operations to generate the process plan and corresponding STEP-NC in XML format. It carries out several stages of process planning such as operations selection, tool selection, machining parameters determination, machine tools selection and setup planning. A hybrid approach of most recent techniques (neural networks, fuzzy logic and rule-based) of artificial intelligence is used as the inference engine of the developed system. An object-oriented approach is used in the definition and implementation of the system. An example part is tested and the corresponding process plan is presented to demonstrate and verify the proposed CAPP system. The paper thus suggests a new feature-based intelligent CAPP system for avoiding complex feature recognition and knowledge acquisition problems.     

SolidWorks二次开发中的零件运动与变化研究

针对软件中模拟零件空间运动与模型特征变化的问题,提出了基于SolidWorks环境的零件运动与变化控制方法,该方法用三类参数方程组表示不同运动,并将各方程组离散化,用程序循环实现指定运动;而零件动态变化则可循环更改特征参数,并通过交替切换并列窗口实现.所提方法同时适用于点动与连续运动,并可引申用于多零件的联动、协作运动...     

变型零件数控程序快速生成系统研究

为提高变型零件数控程序的编制效率,提出了基于主模型零件数控程序主模板的快速编程方法,开发了相应的数控编程系统。首先,对主模型零件进行工艺分析,提取主模型零件加工特征的几何数据,并结合加工特征的加工工艺数据,构造主模型零件的数控程序主模板。主模型零件通过变型生成变型零件后,用变型零件的几何数据更新数控程序主模板中相应的几何数据,然后在工艺决策库的支持下,基于数控程序主模板自动生成该变型零件的数控程序,实现变型零件数控程序的数据驱动式生成。最后,通过实例验证了上述方法及其系统的可行性。     

Rule-based process planning by grouping features

A macro-level CAPP system is proposed to plan the complicated mechanical prismatic parts efficiently. The system creates the efficient machining sequence of the features in a part by analyzing the feature information. Because the planning with the individual features is very complicated, feature groups are formed for effective planning using the nested relations of the features of a part, and special feature groups are determined for sequencing. The process plan is generated based on the sequences of the feature groups and features. When multiple machines are required, efficient machine assignment is performed. A series of heuristic rules are developed to accomplish it.     

Computer-aided manufacturing planning for mass customization: part 1, framework

This paper introduces a comprehensive system for the production planning of the mass customization of non-rotational parts. Combined features are defined based on the concept of part families. The process parameters are associated with the feature parameters so that rapid production planning can be achieved for product design changes. Setup planning is carried out based on both the best practice knowledge in industry and the algorithmic generation of setups. Manufacturing resource, fixture design, and tolerance issues are considered in the production planning. The system also estimates cycle times and generates standard documentation.     

基于Imageware和UG的汽车阀体的反求设计

以汽车阀体零件为研究对象,探讨了逆向工程在汽车零部件设计中的应用.介绍了具有复杂特征的阀体由阀体实物模型到基于三坐标测量仪扫描的点云数据,再到参数化设计的CAD模型,最终形成优化的CAD模型的全过程及Imageware和UG软件在该过程中的应用.提出了一种新的基于点云提取的造型思路,并给出了反求设计的工作流程.     

级进模智能CAD／CAM原理系统CAMSLS

介绍了新一代基于集成信息模型的级进模智能ＣＡＤ／ＣＡＭ系统－ＣＡＭＳＬＳ。它采用面向对象的方法画描述基于特征和知识的冲压件集成信息模型,综合运用ＲＢＲ、ＣＢＲ、ＡＮＮ、等ＡＩ技术,实现了造型过程的并行工艺性评价、单特征工程方案的生成及高度自动化的工步排样,及在基于事例推理和参数化标准模具库技术基础上得到模具设计实例,输出工程图纸和ＮＣ代码。对集成信息模型、工步排样和模具结构设计等做了进一步阐述,对     

级进模智能CAD/CAM原型系统CAMSLS

介绍了新一代基于集成信息模型的级进模智能 CAD/CAM系统— CAMSLS。它采用面向对象的方法来描述基于特征和知识的冲压件集成信息模型 ,综合运用RBR、CBR、ANN等 AI技术 ,实现了造型过程的并行工艺性评价、单特征工艺方案的生成及高度自动化的工步排样 ,及在基于事例推理和参数化标准模具库技术基础上得到模具设计实例 ,输出工程图纸和 NC代码。对集成信息模型、工步排样和模具结构设计等做了进一步阐述 ,对 CAMSLS系统的先进性做了综合性评价     

基于可扩展标记语言的典型零部件设计系统研究

针对网络化协同设计的应用需求,研究了典型零部件设计系统组件体系结构,提出了采用可扩展标记语言表达特征的零部件建模方法。利用可扩展标记语言处理组件及参数化驱动组件,阐述了基于可扩展标记语言的零部件模板生成与参数化重构过程,并结合基于组件的典型零部件设计工具包及专家系统,分析了零部件的设计导航以及零部件之间基于坐标系的自动装配。通过一个在异构计算机辅助设计平台之间进行提升机设计的实例,验证了该系统可实现典型零部件从设计到造型乃至装配过程的一体化、快速化与智能化。     

基于CAXA协同管理系统的桥式起重机系列化设计

在取舍传统设计方法的基础上,利用CAXA协同管理系统,结合桥式起重机的结构特征及其工作原理,在制作工程图模板的基础上,充分利用零部件产品的模块化、参数化设计方法,及协同、并行设计理论,实现了桥式起重机的系列化设计工作。     

差动变压器式位移传感器参数化仿真技术研究

在建立合理的差动变压器式位移传感器(LVDT)电磁仿真模型的基础上,提出了一种基于脚本模板的电磁仿真参数化建模方法:首先将仿真建模过程录制成脚本,然后在脚本中添加标记形成脚本模板,最后将脚本模板中的标识动态修改为参数数值,实现了仿真模型的参数化建模;开发了LVDT参数化仿真系统并在工程中得到应用,显著提高了设计效率.     

基于典型工艺的航空发动机轴类零件工艺设计方法研究

为了提高航空发动机的工艺设计效率,实现零件工艺快速生成,以轴类零件为代表,在分析其结构及工艺特点的基础上,提出一种基于典型工艺的工艺设计方法.该方法针对不同轴类零件,分别采用典型实例工艺和典型模板工艺进行新工艺设计.在此基础上研究了基于典型实例工艺的工艺设计关键技术,包括零件实例信息建模、实例工艺检索、实例工艺修订.详细说明了零件参数库的建立、工艺参数化关系的建立及实现等基于典型模板工艺的参数化工艺设计关键技术,并给出了应用实例.     

CAXA实体设计环境下夹具标准件库的研究与开发

围绕CAXA实体设计的二次开发,结合COM技术、参数化建模方法和数据库技术,提出了基于模板零件的夹具三维标准件库的框架结构,开发了一套适用性强的三维参数化夹具标准件库,实现了夹具标准件的参数化尺寸驱动.     

基于CATIA的飞机钣金结构特征参数化设计系统

提出了飞机钣金结构特征参数化设计系统的体系框架;构建了由特征参数库和特征模板库组成的飞机钣金结构特征数据库。通过CATIA提供的数据输入接口和功能构件开发了设计系统,实现了飞机钣金结构特征的参数化三维建模。工程应用实例表明,设计系统在飞机钣金结构设计中提高了设计质量和设计效率。     

Development and evaluation of feature-focused dynamic routing policy

This paper reports on a development of feature-focused dynamic routing policy and its evaluation in a flexible manufacturing systems (FMS) simulation framework. The dynamic policy is based on an integrative methodology in which process planning system IMPlanner is integrated with FMS simulation module. IMPlanner’s rule-based system process selection system performs knowledge-intensive task of generating alternative processing options for each feature for parts in production plan. Generated alternative routings (process plan network) for each part are utilized in the FMS simulation module such that routing decision in FMS are made on periodic intervals by considering alternative processes for each feature and making decision based on the current system status and performance. The proposed framework has been evaluated in an experimental FMS simulation module, implemented in Arena, in which two performance criteria, machine utilization and WIP, were used to make routing decisions. The feature-focused approach is compared with traditional static decision-making, and its improved performance is demonstrated.     

基于实例检索的轴类零件工艺设计

轴类零件在机械产品中广泛应用,以轴类零件为对象,研究了基于实例相似性检索的轴类零件工艺规划。设计了特征编码结构进行实例分组,通过特征编码矩阵的匹配在实例库中检索相似的实例,以此获得待加工零件的加工工艺。基于实例技术的工艺设计方法具有较好的通用性,同时也提高了设计效率和质量。