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首页> 外文期刊>International Journal of Production Research >Unified functional tolerancing approach for precision cylindrical components
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Unified functional tolerancing approach for precision cylindrical components

机译：精密圆柱零件的统一功能公差方法

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摘要

Current geometric dimensioning and tolerancing (GD&T) standards dictate that the geometry of a cylindrical manufactured part should be characterized in terms of its roundness, straightness, cylindricity and diameter. However, standards define the form errors using maximum peak-to-valley values - a very simplistic geometric description. As a result, measurements based on GD&T definitions for manufactured parts are ineffective for identifying and diagnosing error sources in a manufacturing process. This paper introduces a new tolerancing scheme for cylindrical parts and its application to functional tolerancing for diesel engine components. The new tolerance definition method is based on Legendre and Fourier polynomials for modelling and characterizing typical geometric errors found in machined cylindrical parts. As the tolerance parameters in the new tolerancing scheme represents the whole profile characteristics of the part geometry, they provide a direct link to part function and error sources of manufacturing processes. This paper describes the Legendre and Fourier polynomials-based tolerancing method. Typical machining errors of cylindrical parts in precision turning and grinding processes are analysed and modelled using the new tolerancing method. Application of the new tolerancing method is illustrated with an example of functional tolerancing a production diesel engine component, which shows that the new tolerancing method is effective for the specification and control of fuel leakage variation in diesel engine component design and manufacturing.
机译：当前的几何尺寸和公差标准（GD＆T）规定，圆柱形制造零件的几何形状应根据其圆度，直线度，圆柱度和直径来表征。但是，标准使用最大峰谷值（非常简单的几何描述）来定义形状误差。结果，基于GD＆T定义的制造零件的测量对于识别和诊断制造过程中的错误源是无效的。本文介绍了一种新的圆柱零件公差方案，并将其应用于柴油机零件的功能公差。新的公差定义方法基于Legendre和Fourier多项式，用于建模和表征在加工的圆柱零件中发现的典型几何误差。由于新公差方案中的公差参数代表了零件几何形状的整体轮廓特征，因此它们提供了零件功能和制造过程的误差源的直接链接。本文介绍了基于勒让德和傅立叶多项式的容差方法。使用新的公差方法对圆柱零件在精密车削和磨削过程中的典型加工误差进行了分析和建模。以生产柴油机部件的功能公差为例说明了新公差方法的应用，这表明新公差方法对于规范和控制柴油机零件设计和制造中的燃油泄漏变化是有效的。

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