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首页> 外文期刊>Journal of Intelligent Manufacturing >Dimension and tolerance modeling and transformations in feature based design and manufacturing
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Dimension and tolerance modeling and transformations in feature based design and manufacturing

机译：基于特征的设计和制造中的尺寸和公差建模以及转换

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摘要

This paper describes the development and application of a geometric dimension and tolerance (GD&T) model for use in both design and process planning. The model meets criteria for computability and compatibility with the Y14.5M standard. The modelis first used to capture the designers GD&T scheme on a feature based design model, validate its completeness, and then transfer the GD&T to machining features extracted automatically by feature recognition. The model is based on relative degrees offreedom of geometric entities: feature axes, edges, faces and features-of-size. Dimension graphs are created based on the degrees of freedom for each control direction. Datum reference frames and standard tolerance classes are incorporated into the graph. The model allows dimension specification, dimension scheme modification, and dimension scheme validation. A methodology to automatically determine the GD&T of machining volumes obtained by feature recognition is also described.
机译：本文介绍了几何尺寸和公差（GD＆T）模型的开发和应用，该模型可用于设计和过程规划。该模型符合Y14.5M标准的可计算性和兼容性标准。该模型首先用于在基于特征的设计模型上捕获设计者的GD＆T方案，验证其完整性，然后将GD＆T转移到通过特征识别自动提取的加工特征中。该模型基于几何实体的相对自由度：特征轴，边，面和尺寸特征。基于每个控制方向的自由度创建尺寸图。基准参考系和标准公差等级已合并到图中。该模型允许尺寸规格，尺寸方案修改和尺寸方案验证。还介绍了一种自动确定通过特征识别获得的加工量的GD＆T的方法。

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