Determination of key workpiece product characteristics in a machining fixture using uncertainty analysis and loss cost function implementation
Determination of key workpiece product characteristics in a machining fixture using uncertainty analysis and loss cost function implementation
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使用不确定性分析和损失成本函数实施来确定加工夹具中的关键工件产品特性
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
F. Faura
中科院分区：
文献类型：
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作者：
H. T. Sánchez;M. Estrems;F. Faura
夹具相关误差的研究对提高机械加工零件的质量起着越来越重要的作用。在这项工作中，定位器的加工夹具的变异性进行了分析，以下的不确定性的方法，使我们能够估计夹具相关的几何误差的加工工件的关键产品特性的影响。实施蒙特卡罗模拟以产生足够的可变性，以确定加工工件表面的测量点的期望值及其相关的关键产品特性。蒙特卡罗模拟的结果允许足够的值范围来构建夹具相关误差和加工工件关键产品特性之间的数学关系。此外，田口损失函数用于研究给定固定不确定性方案所产生的损失成本。一个例子问题的棱柱形工件，由于夹具系统的定位误差进行评估，以了解其对工件的平面度及其相关的不确定性的影响。
The study of fixture related errors is playing an increasingly important role in the improvement of machined part quality. In this work, the locator variability of machining fixtures is analyzed following an uncertainty approach, allowing us to estimate the effect of fixture related geometrical errors on key product characteristics of machined workpieces. Monte Carlo simulation was implemented to generate sufficient variability to determine the expected value of the measuring points of the machined workpiece surface and its related key product characteristic. The results from the Monte Carlo simulation allow sufficient range of values to construct a mathematical relationship between fixture related errors and machined workpiece key product characteristics. Furthermore, the Taguchi loss function is used to investigate the loss cost incurred by a given fixturing uncertainty scheme. An example problem of a prismatic workpiece is presented, where the locating error due to the fixturing system is evaluated in order to know its influence on the workpiece flatness and its associated uncertainty.