用Inventor进行三维设计

机械产品研制过程中的问题往往集中在部件装配、整机装配时发生,如在产品设计过程中采用三维CAD系统进行设计,则在零件的三维模型基础上,可以在计算机中完成零部件或产品的预装配及运动仿真,这样可以及时发现问题并且修改,同时针对设计好的零部件和装配体,计算机可以自动生成各种工程视图,大大提高了设计效率。Inventor是Autodesk公司最新推出的第三代机械设计软件,具有三维建模、装配、可视化和制图等方面功能。下面以弹性支承为例说明在Inventor中实现机械产品三维设计的过程。该弹性支承由底座、调整螺钉、弹簧、支承柱、顶丝…     

基于KBE与ActiveX的产品参数化设计研究

针对目前尺寸驱动参数化建模方法存在的不足,提出了程序外驱动参数化建模思想,利用面向对象方法开发了基于知识工程(KBE)的机械产品参数化设计平台.该平台以三维CAD系统API模块为接口,采用ActiveX Automation技术,通过消息数据通信,将.NET开发的设计系统与CAD/CAE软件进行无缝集成.以桥式起重机设计为例,在知识重用和产品信息共享的基础上快速实现三维建模与虚拟装配,为数字化设计与制造提供了高效,准确、实用的方法.     

基于Autodesk Inventor创建的企业标准件库

Autodesk Inventor是一款很有特色的基于参数化、变量化特征建模的三维设计软件,可以在装配中或者基于装配关系进行零部件的关联设计.     

《CAD习题集》

本习题集由北京菁华锐航科技有限公司组织院校教师和企业专家编写,内容包括草图、零件建模、曲线与曲面、钣金与焊接、设计控制、装配等方面。案例精选自院校教学和企业工程实践,覆盖诸多行业,充分体现三维CAD软件的功能特点。适合各类三维CAD软件（如SolidWorks、Pro／E、UGNX、CAXA、Inventor等）的教学和培训。     

基于Autodesk Inventor创建的企业标准件库

Autodesk Inventor是一款很有特色的基于参数化、变量化特征建模的三维设计软件,可以在装配中或者基于装配关系进行零部件的关联设计.……     

基于Inventor的三维参数化部件库系统的开发方法

介绍了基于AutodeskInventor的部件库的体系结构和实现方法。把部件库系统分为零件库和部件库两层结构,通过部件模型确定组成部件的组成零件及其装配关系,通过数据表和程序确定零件的规格。此方法解决了常用三维CAD软件不直接支持装配件参数驱动的问题,使得基于三维CAD软件创建部件库系统成为可能。文中所述部件库系统是使用VC++对Inventor进行二次开发而得到的。同时,该方法也适用于其他常用三维CAD软件。     

基于对象的智能标注三维CAD工程图技术在标注国标化中的应用

一 前言Solid2000是友信软件公司近期推出的一套三维参数化CAD软件系统它不但具有动态导航参数驱动特征造型装配约束等新一代三维CAD系统的特点而且在将三维模型投影成二维工程图时针对国标化作了独特的设计笔者有幸参与了其中的部分工作现把一些体会写出来期待和大家互相交流共同提高在工程图模块设计的需求分析阶段我们了解到大多数的用户都需要将设计按照国标或其他标准表述成传统的工程图不少用户只能使用三维CAD软件设计好实体模型后先把模型投影到二维视图中然后再导出到AutoCAD或其他二维绘图系统中通过人工修整来获得标准的工…     

应用SolidWorks进行地铁客车设计

一、CAD技术的两次革命CAD技术发展到今天,经历了二次技术革命：第一次革命是80年代二维CAD软件的推广,国内普遍运用的是AutoCAD软件,利用二维CAD软件使设计师彻底地“甩掉”了图版,解决了使用绘图板所带来的诸多弊端;第二次革命就是大量三维软件的崛起,推动了设计领域的新革命。三维CAD软件不仅仅是创建实体模型,而是利用设计出的三维实体模型进行模拟装配和静态干涉检查、机构分析和动态干涉检查、动力学分析、强度分析、铸造、各种加工、美工处理等。所以说,应用三维软件进行设计的真正意义不仅仅是在于设计模型本身,而…     

复合式土压平衡盾构刀盘CAD系统开发

在结合盾构刀盘构型、开口和刀具布置规律等理论基础上,以三维软件SolidWorks为开发平台,以Visual Basic作为开发工具,开发了一种复合式土压平衡盾构刀盘CAD系统。该CAD系统采用编程法与尺寸驱动法两种开发方式,设计了刀盘选型模块、开口设计模块、刀具选型模块和刀具布置模块等八个模块,实现对复合式土压平衡盾构刀盘、刀具进行三维参数化优化设计。针对某地铁施工工程需求,应用所开发的复合式土压平衡盾构刀盘CAD系统,设计了直径6.28 m,开口率为32%,装配有滚刀35把,正面刮刀40把,边缘刮刀8把的刀盘。     

某采棉机传动系统动力学仿真分析

传动系统是棉花收获机械中必不可少的重要部分,其运转的可靠性和稳定性直接影响到采棉机的运行。为了验证设计的合理性,本文运用三维建模软件SolidWorks建立了该传动系统的三维实体模型。通过建立其三维实体模型可以预知真实系统的装配关系以及整机质量等参数。在确定该传动系统设计合理以后,本文还运用虚拟样机技术对其进行了模拟仿真,找出了传动系统的运动学关系,求得了该系统的数值计算解。这种方法节省了经济投入,方便快捷,为实际样机的设计和制造提供了依据。     

基于Inventor API的家具三维造型设计

国内外家具业趋向于设计出不同系列风格的家具,同时又要求提高设计效率.为了能够满足这方面的需要,通过研究Inventor API的功能,关联Inventor与数据库Excel,运用Inventor的二次开发工具Autodesk Inventor Wizards,基于VB.NET实现了对话框界面的通讯机制,即实现人机交互界面以达到程序自动建模的功效.从已有的家具模版中自动地生成新的家具,并能够替换整体家具的零部件,大大地提高了设计效率,实现并给出了程序示例.快速、自动地新建家具模型的结果表明,基于Inventor API的技术在家具三维造型设计二次开发中具有重要的意义.     

A new adaptive slicing approach for the fully dense freeform fabrication (FDFF) process

Fully dense freeform fabrication (FDFF) is a process based on thin line cutting processes, variable thickness layering, slicing in different orientations, and bulk layer attachment. The combination of these capabilities enables the production of good quality complex parts from practically any material at a very fast pace. As for rapid prototypes fabricated by the FDFF process, it is certainly possible to employ adaptive slicing technique due to the possibility of cutting different metal/non-metal sheet at various thicknesses. This paper proposes a new adaptive slicing method whereby the capability of cutting a 3D solid model at the predefined sheets’ thicknesses is achieved and the geometry of all internal and external features of a part is also investigated to ensure the reduction of part geometry deviation through the seamless curvature detection. Despite most previous works which start slicing a tessellated or direct CAD model at the maximum available thickness, this system commences the process with available minimum thickness by applying a new adaptive method to all pairs of contours at the top and bottom slices of the layer. Autodesk Inventor solid modeler, as a design-by-feature solid modeler, is used for 3D solid modeling. The proposed system is implemented by Visual Basic codes inside Inventor using API functions to access both geometry and topology information of the design-by-feature solid model. This system has been successfully tested on a variety of complex parts containing sophisticated internal and external features.     

A PDES/STEP-based model and system for concurrent integrated design and assembly planning

Product data exchange and interfacing between different CAD/CAM systems are of great importance to the development of concurrent integrated design environments and computer integrated manufacturing systems. This paper presents a STEP-based method and system for concurrent integrated design and assembly planning. An integrated object model for mechanical systems and assemblies is first defined by a hierarchy of structure, geometry and feature. The structure is represented as a component-connector or joint multi-level graph with both hierarchical functional and assembly relations. These hierarchical relation models are then used for uniformly describing their causal relations both for assembly level and feature based single part level. The generic product assembly model is organized according to STEP, using mostly the entities of integrated resources and partly self-defined entities, which are necessary for design and assembly planning. Based on the generic product assembly model, STEP-based strategies and agent concepts are used for agent-based concurrent integration of design and assembly planning. A prototype system, consisting of a CAD system, a product modeling system, an assembly planning system, and an assembly evaluation system is developed, in which product data can be exchanged between these subsystems. Details about the implementation of the system are addressed. The integrated design and assembly planning system can support the introduction of a new product. The results of assembly planning are feedback to the stage of assembly design to improve on the design. A case study is carried out for assembly-oriented design of a gearbox, to illustrate the proposed approach and to validate the developed system.     

PKM capabilities and applications exploration in a collaborative virtual environment

This paper introduces an integrated validation system that consists of the following modular components: kinematic/dynamic analysis module, kinetostatic model, CAD module, FEM module, CAM module, optimization module and virtual environment for remote control. In this paper, authors focus mainly on the modules of kinetostatic modeling, dynamic modeling, PKM design optimization and remote control realization. The prototype of a 3-dof Parallel Kinematic Machine (PKM) developed at the Integrated Manufacturing Technologies Institute of National Research Council of Canada (NRC-IMTI) is used as an example throughout this paper.     

一种面向方案设计的装配建模表示方法

ＣＡＤ系统对方案设计支持的关键是建立独立于几何细节而又表达的功构关系的装配模型,本文试图运用逻辑装配单元的定义来实现产品功能需求和结构表现间的有效关联,分别讨论了方案设计中功能描述和几何构形表示方式,形式化表达了方案设计的逻辑造型和装配建模过程,给出了支持自顶向下方案设计的装配模板定义,为方案设计的计算机辅助实现作了有益的尝试。     

Knowledge-based approach and system for assembly-oriented design,Part II: the system implementation

Assembly is one of the most important stages for product development. Assembly-oriented design (AOD) is a new approach to designing assemblies, which uses a number of design and analysis tools to help the designer plan out and analyze candidate assembly schemes prior to having detailed knowledge of the geometry of the parts. Using this approach, many assembly schemes can be inexpensively evaluated for their ability to deliver the important characteristics of the final product. This research proposes a knowledge-based approach and develops an expert design system to support top-down design for assembled products. The presentation of research report is divided into two parts: the knowledge-based approach (Part I) and the knowledge-based expert design system (Part II). This paper is the second part of the report (Part II). It will focus on the development of knowledge-based expert design system for assembly oriented design. The knowledge-based assembly oriented design system, i.e., the assembly oriented design expert system (AODES) is constructed to integrate assembly modeling and design, assembly planning, assemblability analysis and evaluation within a concurrent engineering environment. This intelligent system is implemented by integrating object-oriented representation, constraint-based modeling, rule-based reasoning, truth maintenance, and interfacing to database management system and CAD module, in which fuzzy logic based knowledge representation and inference technique are also applied to deal with uncertain data and knowledge in the design process. The developed system differs from the existing systems adopting part-first bottom-up modeling technique, in which a comprehensive intelligent framework is used for assembly modeling and design in a top-down manner from the conceptual level to the detailed level. It is able to help obtain better design ideas, provide users with suggestions so as to create and improve a design, and therefore give users the possibility to assess and reduce the total production cost at an early stage during the design process. Through the use of the system, the concurrent engineering knowledge can be effectively incorporated into the assembly design process in an integrated manner. A case assembly design shows that the intelligent modeling and design system is feasible.     

COM技术在Autodesk Inventor二次开发中的应用

Inventor作为Autodesk面向机械及其相关行业的3D设计、产品建模及模拟分析的软件,在已经具有强大的功能模块的基础上,也具有良好的软件扩张性,用户可以根据自己的特殊需求进行二次开发,针对每个平台的特殊性,所采用的技术也各不相同,结合实例研究COM技术在Inventor二次开发中的应用,包括Add-In的加载和与Inventor之间的交互。     

Variational solid modeling for tolerance analysis

A variational model is a computer representation of a variational class and stands for a collection of different instances of the part or assembly modeled in CAD. The different basic approaches to variational modeling are reviewed. A surface-based approach to variational modeling is discussed. The approach is applied to solving the problems of eliminating rigid-body motion, handling incidence and tangency constraints, and modeling form variations. The application of variational modeling to automated tolerance analysis is also discussed