[计算机辅助设计与制造04.ppt

计算机辅助设计与制造 CAD/CAM建模技术 制作：彭浩舸 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 5. 特征建模 特征建模概述 特征建模原理 特征间的关系 特征的表达方法 特征库建立 特征建模是建立在实体建模基础上，利用特征的概念面向整个产品设计和生产制造过程进行设计的建模方法 不仅包含与生产有关的非几何信息，而且描述这些信息之间关系 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 1.特征建模的定义 特征包含丰富的工程语言，它在是更高层次上对几何形体上的型腔、孔、槽等的概括。 设计、制造一体化观点： 产品特征=形状特征+工程语义信息 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 1.特征建模的定义 形状特征的定义 语言信息： 1、静态信息 2、规则和方法 3、特征信息 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 2、特征建模的分类 制造方法不同：分为铸、锻、焊、机加工和注塑成型等特征。 零件类型不同：轴盘类、板块类、箱体类、自由曲面类等特征。 其它分法： 根据设计过程中的作用：基特征、正特征和负特征、主特征和辅助特征 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for