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首页> 外文期刊>International Journal of Computer Integrated Manufacturing >Automatic generation of min/max tolerance charts for tolerance analysis from CAD models
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Automatic generation of min/max tolerance charts for tolerance analysis from CAD models

机译：自动生成最小/最大公差图以从CAD模型进行公差分析

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摘要

The so-called min/max tolerance charts are popular for analysing tolerance accumulation in parts and assemblies, despite the fact that this method is limited to one-dimensional worst-case analysis. Since different chart construction rules apply to different tolerance classes, the user has to remember all the different rules to construct a valid tolerance chart. Constructing the charts manually, as is common practice in industry today, is time-consuming and error-prone. This paper presents procedures for automating tolerance charting. It requires a computer aided design (CAD) model with GD&T specifications as input. The automation is based on a data model called the constraint-feature-tolerance (CTF) graph and machine interpretable representation of charting rules specific to each tolerance class. This paper also presents procedures for automatically extracting dimension and tolerance stacks for any user defined analysis dimension, and automatic part arrangement in assemblies corresponding to worst case analyses. Important implementation issues are also discussed and several case studies are presented, the results of which have been verified by manual chart construction.
机译：尽管这种方法仅限于一维最坏情况分析，但所谓的最小/最大公差图仍可用于分析零件和装配体中的公差累积。由于不同的图表构造规则适用于不同的公差等级，因此用户必须记住所有不同的规则以构造有效的公差图表。按照当今行业的惯例，手动构造图表既耗时又容易出错。本文介绍了自动执行公差图绘制的过程。它需要以GD＆T规格为输入的计算机辅助设计（CAD）模型。自动化基于称为约束特征公差（CTF）图的数据模型和特定于每种公差类别的制图规则的机器可解释表示。本文还介绍了自动提取任何用户定义的分析尺寸的尺寸和公差堆栈的程序，以及自动装配零件中与最坏情况分析相对应的零件的过程。还讨论了重要的实施问题，并提供了一些案例研究，其结果已通过手动图表构建得到验证。

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