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Guidelines for building 2D CAD models of turned components in CAD-CAPP integration
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The paper describes the use of the so-called "tolerance tree" in sequencing procedures for bending to be used in an integrated CAPP system.
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| | Based on Group Technology, a CAD/CAPP integrated system is developed. This paper mainly covers the research work of the CAPP subsystem. In this subsystem, geometric and manufacturing information is obtained from the CAD data base, modular block programming and full Chinese menu are adopted, process planning is produced with the semi-generative method, and process card involved the operation charts is yielded by printer. | | 本文对CAD/CAPP集成系统中CAPP子系统的研制工作进行了简要介绍。 该CAPP子系统以成组技术为基础,可以从集成系统的CAD数据库中取得已设计零件的有关信息,亦可单独输入零件图纸信息,采用半创成式原理生成工艺规程。系统应用模块化程序结构,人机对话采用汉字菜单提问方式,并由打印机输出包括工序图在内机械加工工艺卡片。 系统操作简单,方便,运行速度快,实现了CAPP与CAD的集成,是一个先进实用的CAPP系统。 | | 文摘来源 | | The greatest difficulty to realize CAD/CAPP integrated system is to link CAD with CAPP, of which the key is CAD. To solve this problem, this investigation provides a CAD model which is established by the method of feature modelling, and deals with the description method of parts in the model, the modelling method of basic geometrics, database Construction and its application in the HTD-CAD/CAPP integrated system. On this basis, this paper introduces further how the CAPP Subsystem aut... | | 实现CAD/CAPP集成所面临的最大难题是CAD与CAPP的连接,关键是CAD。为此本文提出了一种特征建模的CAD模型,并论述了在该模型下的零件描述方法、基本几何体的造型方法、数据库的结构及其在HTD—CAD/CAPP集成系统中的应用。在此基础上,进一步叙述了CAPP子系统如何利用零件的设计信息来进行工艺过程的自动化设计。 | | 文摘来源 | | A CAD model which is based on feature modelling and experiences is present in this paper.On the basis of geometry combination representation a component may be considered to consist of several geometrical elements which possess unique feature in shape and in manufacture,Thus the CAD database may be shared by both of CAD and CAPP.A HTD-CAD/CAPP integrated system developed by author has been employed in 3 middle sized factories in China and mainly for ratation components. | | 在实践的基础上提供一种特征建模的CAD模型,采用三维几何造型法建造零件,将零件视为由若干具有独特形状特征的基本几何体按布尔规则组合而成。由于零件具有明显的几何和工艺特征,因而能被CAPP系统所识别,形成数据共享,通过零件数据库实现二者之间的连接。结合特征建模的HTD—CAD/CAPP集成系统的应用实践,介绍了如何运用零件的设计信息来进行工艺过程自动化设计。 | | 文摘来源 | |   | | << 更多相关文摘 |
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