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Machining tests to identify kinematic errors on five-axis machine tools

机译:机加工测试以识别五轴机床上的运动学误差

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摘要

The machining of a cone frustum as specified in National Aerospace Standard (NAS) 979 is widely accepted as a final performance test for five-axis machining centers. Although it gives a good demonstration of the machine’s overall machining performance, it is generally difficult to separately identify each error source in the machine from the measured error profile of the finished workpiece. This paper proposes a set of machining tests for a five-axis machine tool to identify its kinematic errors, one of its most fundamental error sources. In each machining pattern, a simple straight side cutting using a straight end mill is performed. The relationship between geometric errors of the finished workpiece and the machine’s kinematic errors is formulated based on the kinematic model of a five-axis machine. The identification of kinematic errors from geometric errors of finished workpieces is experimentally demonstrated on a commercial five-axis machining center, and the estimates are compared to those estimated based on ball bar measurements.
机译:美国国家航空航天标准(NAS)979中规定的圆锥台的加工被广泛接受为五轴加工中心的最终性能测试。尽管可以很好地说明机器的整体加工性能,但通常很难从测量出的成品工件的轮廓中分别识别出机器中的每个误差源。本文提出了一套针对五轴机床的机加工测试,以识别其运动学误差,这是其最基本的误差源之一。在每种加工方式中,均使用直立铣刀进行简单的直边切割。根据五轴机床的运动学模型,计算出成品工件的几何误差与机床运动学误差之间的关系。在商用五轴加工中心上通过实验证明了从完成工件的几何误差识别运动学误差,并将估计值与基于球杆测量值的估计值进行了比较。

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