IGES——实现CAD／CAM系统间数据交换的规范

介绍在不同ＣＡＤ／ＣＡＭ系统间进行数据交换时所采用的标准ＩＧＥＳ的历史地位、数据交换原理、文件内容、数据记录格式、存在问题以及解决办法。     

IGES—实现CAD／CAM系统间数据交换的规范

主要介绍在不同ＣＡＤ／ＣＡＭ系统间进行地所采用的标准ＩＧＥＳ的历史地位、数据交换原理、文件内容、数据记录格式、存在问题以及解决办法。     

RECOGNITION OF STRUCTURAL DIAGRAM OF MACHINE TOOL SPEED CHANGE SYSTEM WITH ANY COMPOSITE RATIO

ＲＥＣＯＧＮＩＴＩＯＮＯＦＳＴＲＵＣＴＵＲＡＬＤＩＡＧＲＡＭＯＦＭＡＣＨＩＮＥＴＯＯＬＳＰＥＥＤＣＨＡＮＧＥＳＹＳＴＥＭＷＩＴＨＡＮＹＣＯＭＰＯＳＩＴＥＲＡＴＩＯＲＥＣＯＧＮＩＴＩＯＮＯＦＳＴＲＵＣＴＵＲＡＬＤＩＡＧＲＡＭＯＦＭＡＣＨＩＮＥＴＯＯＬＳ...     

RESEARCH OF NEWTECHNOLOGIES IN GEAR-MACHINING

ＲＥＳＥＡＲＣＨＯＦＮＥＷＴＥＣＨＮＯＬＯＧＩＥＳＩＮＧＥＡＲ－ＭＡＣＨＩＮＩＮＧＲＥＳＥＡＲＣＨＯＦＮＥＷＴＥＣＨＮＯＬＯＧＩＥＳＩＮＧＥＡＲ－ＭＡＣＨＩＮＩＮＧＬｉａｎｇＸｉｃｈａｎｇ；ＳｈａｏＭｉｎｇ；ＣｈｅｎＤａＴｈｅＳｔａｔｅＫｅｙＬａｂｏ...     

RESEARCH ON COMBINATION AND PLANNING OF PROCESSING UNITS UNDER CIMS CONDITION

ＲＥＳＥＡＲＣＨＯＮＣＯＭＢＩＮＡＴＩＯＮＡＮＤＰＬＡＮＮＩＮＧＯＦＰＲＯＣＥＳＳＩＮＧＵＮＩＴＳＵＮＤＥＲＣＩＭＳＣＯＮＤＩＴＩＯＮＲＥＳＥＡＲＣＨＯＮＣＯＭＢＩＮＡＴＩＯＮＡＮＤＰＬＡＮＮＩＮＧＯＦＰＲＯＣＥＳＳＩＮＧＵＮＩＴＳＵＮＤＥＲＣＩＭＳ...     

PERFORMANCE CHARACTERISTICS AND VISCOUS FLOW ANALYSIS OF CENTRIFUGAL PUMPS

ＰＥＲＦＯＲＭＡＮＣＥＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＡＮＤＶＩＳＣＯＵＳＦＬＯＷＡＮＡＬＹＳＩＳＯＦＣＥＮＴＲＩＦＵＧＡＬＰＵＭＰＳＰＥＲＦＯＲＭＡＮＣＥＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＡＮＤＶＩＳＣＯＵＳＦＬＯＷＡＮＡＬＹＳＩＳＯＦＣＥＮＴＲＩＦＵＧ...     

APPLYING REGRESSION AND STOCHASTIC TIME SERIES ANALYSIS TO THE PREDICTION OF PITTING FATIGUE LIFE FOR GEARS

ＡＰＰＬＹＩＮＧＲＥＧＲＥＳＳＩＯＮＡＮＤＳＴＯＣＨＡＳＴＩＣＴＩＭＥＳＥＲＩＥＳＡＮＡＬＹＳＩＳＴＯＴＨＥＰＲＥＤＩＣＴＩＯＮＯＦＰＩＴＴＩＮＧＦＡＴＩＧＵＥＬＩＦＥＦＯＲＧＥＡＲＳＡＰＰＬＹＩＮＧＲＥＧＲＥＳＳＩＯＮＡＮＤＳＴＯＣＨＡＳＴＩＣＴＩ...     

FLOW FIELD ANALYSIS AND GRAPHIC CAD DURING 3─ROLL REDUCING OF THE HOLLOW TUBE

ＦＬＯＷＦＩＥＬＤＡＮＡＬＹＳＩＳＡＮＤＧＲＡＰＨＩＣＣＡＤＤＵＲＩＮＧ３─ＲＯＬＬＲＥＤＵＣＩＮＧＯＦＴＨＥＨＯＬＬＯＷＴＵＢＥＦＬＯＷＦＩＥＬＤＡＮＡＬＹＳＩＳＡＮＤＧＲＡＰＨＩＣＣＡＤＤＵＲＩＮＧ３─ＲＯＬＬＲＥＤＵＣＩＮＧＯＦＴＨＥＨＯＬＬＯ...     

IMPROVEMENTS ON THE CONFIGURATION AND OPTIMUM PARAMETERS OF HIGH一SPEED THRUST BEARINGS

ＩＭＰＲＯＶＥＭＥＮＴＳＯＮＴＨＥＣＯＮＦＩＧＵＲＡＴＩＯＮＡＮＤＯＰＴＩＭＵＭＰＡＲＡＭＥＴＥＲＳＯＦＨＩＧＨ一ＳＰＥＥＤＴＨＲＵＳＴＢＥＡＲＩＮＧＳＩＭＰＲＯＶＥＭＥＮＴＳＯＮＴＨＥＣＯＮＦＩＧＵＲＡＴＩＯＮＡＮＤＯＰＴＩＭＵＭＰＡＲＡＭＥＴＥＲ...     

NEW VIEW OF CHARACTERISTIC ZONE CLASSIFICATION OF FUSION WELDING JOINT

ＮＥＷＶＩＥＷＯＦＣＨＡＲＡＣＴＥＲＩＳＴＩＣＺＯＮＥＣＬＡＳＳＩＦＩＣＡＴＩＯＮＯＦＦＵＳＩＯＮＷＥＬＤＩＮＧＪＯＩＮＴＮＥＷＶＩＥＷＯＦＣＨＡＲＡＣＴＥＲＩＳＴＩＣＺＯＮＥＣＬＡＳＳＩＦＩＣＡＴＩＯＮＯＦＦＵＳＩＯＮＷＥＬＤＩＮＧＪＯＩＮＴＺｈａ...     

An extended schema and its production rule-based algorithms for assembly data exchange using IGES

Assembly data exchange and reuse play an important role in CAD and CAM in shortening the product development cycle. However, current CAD systems cannot transfer mating conditions via neutral file format, and their exported IGES files are heterogeneous. In this paper, a schema for the full data exchange of assemblies is presented based on IGES. We first design algorithms for the pre-and-post processors of parts based on solid model, in which the topologies are explicitly specified and will be referred by mating conditions, and then extend the IGES schema by introducing the Associativity Definition Entity and Associativity Instance Entity defined in IGES standard, so as to represent mating conditions. Finally, a production rule-based method is proposed to analyze and design the data exchange algorithms for assemblies. Within this schema, the heterogeneous representations of assemblies exported from different CAD systems can be processed appropriately, and the mating conditions can be properly exchanged. Experiments on the prototype system verify the robustness, correctness, and flexibility of our schema.     

基于敏捷制造的从IGES格式到XML格式中性文件的转换研究

根据敏捷制造中产品数据共享的概念 ,探讨了在CAD/CAPP/CAM集成系统中 ,将IGES格式文件转换成XML格式文件的规则及方法。以C #为开发平台 ,研制符合STEP标准的XML中性信息文件转换系统 ,并建立基本转换信息库 ,以存储、传递面向CAx的设计制造特征信息     

基于IGES的反求工程中的数据转换

为了解决反求工程中测量数据与CAD/CAM系统之间的数据转换问题,设计了基于IGES文件格式的数据转换模块,实现了将测量的点云数据转换为标准数据格式的IGES文件,该文件可以被CAD/CAM系统正确读取.经过测试,几何数据转换完整,结果可靠.     

面向NURBS曲面在线检测的IGES文件解释器的开发

在线检测系统选取测量点集的常用途径是从NURBS曲面获取,从CAD模型中解析NURBS曲面信息是在线检测系统的一项关键技术。通过对由CAD系统生成IGES文件的格式进行研究,提出一种从IGES文件析取NURBS曲面属性信息和定义信息的方法,在Visual C＋＋6.0平台上开发IGES文件解释器,经过多次测试,开发的IGES文件解释器能够高效稳定地从IGES V5.2/5.3文件中析取NURBS曲面数据。     

基于IGES的面型检测技术及其实现

分析了IGES文件格式,探讨了从CAD设计模型中读取IGES图形信息并进行OpenGL图形显示的程序流程,并编制了相应的软件实现了IGES数据的读取和三维显示;对各种不同的测量数据与设计面型比对方法进行了分析,给出了基于CAD转换的比对方法,并以某天线检测数据比对为例,验证了方法的可行性,结果表明该方法在保证精度的同时提高了比对的效率.     

CADEXCAP: Integration of 2D CAD models of turned components with CAPP

EXCAP is a knowledge-based process-planning system for turned components. This paper describes a software package called CADEXCAP, which has been developed to integrate EXCAP and CAD systems via IGES. CADEXCAP deciphers a full 2 D model of a turned component developed on a CAD system and then, via IGES, fully automatically generates a product model in the EXCAP model format. It is clever enough to extract not only the geometrical information but also the other required information, such as geometrical and dimensional tolerances, surface finish and manufacturing instructions.     

Pro/E与MasterCAM的数据转换实践

Pro/E和MasterCAM是当前国内外模具设计与数控加工中使用最为广泛的CAD/CAM软件。二者各具特色,配合使用可提高零件设计及数控加工的效率和质量。阐述了不同软件数据间的文件转换,并通过实例利用三维建模软件Pro/E构建＂烟灰缸＂模型,以IGES格式输出,转换到MasterCAM9.0中加工,从而说明二者在产品三维造型及数控加工中的配合应用。     

基于三角曲面的逆向工程CAD建模方法

根据目前逆向工程CAD建模中存在的问题，提出一种基于三角Bezier曲面模型初始表达的跨平台产品逆向工程CAD建模策略，既能利用三角Bezier曲面的优势，又能有效地与通用CAD软件集成。对涉及产品逆向建模方案、数字化测量规划、实际建模过程和再创新设计等具体内容进行了详细阐述，并结合具体实例说明了该方法的可行性和有效性。     

Guidelines for building 2D CAD models of turned components in CAD-CAPP integration

EXCAP is a knowledge-based process-planning system for rotational components. CADEXCAP is software which has been developed to integrate EXCAP with CAD systems via IGES (Initial Graphics Exchange Specification). CADEXCAP deciphers a full 2D model of a turned component developed on a CAD system and then via IGES it fully automatically generates a product model in a format suitable for EXCAP. This paper describes the guidelines which have to be followed at the CAD modelling stage of the components which are to be used by CADEXCAP. Following these guidelines will guarantee the automatic extraction of complete product models. This not only includes the geometry but also includes nongeometric information such as toleranced dimensions, geometrical tolerances, manufacturing instructions and surface finish.     

Integration of sketch-based conceptual design and commercial CAD systems for manufacturing

Sketch-based modeling is a very important step towards a complete design process digitalization. For a complete digitalization, integration of sketch-based design modeling and commercial CAD systems is being a necessity. This is because of the need of detailed modification and refinement for the 3D models created by sketching. The integration can speed up the design process and affect competition between companies. In this paper, we present a new method to achieve the integration between sketch-based interfaces and commercial CAD systems by using gesture-based sketch modeling techniques for producing 3D conceptual design models and then translating the 3D models into CAD systems with feature recognition through IGES exchange files. Gesture-based modeling method was used because it works in a similar way to feature-based design approach and it is easy to extract features from its 3D models. IGES file format was used for exchanging 3D geometric model information because it is widely available within commercial CAD systems for data exchange and it also can express features and hierarchy information. 3D models were created with a gesture-based sketch interface for modeling and then information was extracted from it. After that, information was translated into IGES entities which were organized in a specific order in an IGES file. This information can be inputted into commercial CAD systems and recognized as a feature-based model with feature recognition embedded within CAD systems. To evaluate the proposed method, we conducted four case studies. In these case studies, we created 3D models and then transferred them into Autodesk Inventor as a commercial CAD system. After the CAD system recognized the 3D models successfully, we applied some modifications on the 3D models such as changing dimensions, positions and drafting to demonstrate the effective integration.