Analysis of the effects of fixture clamping sequence on part location errors
Analysis of the effects of fixture clamping sequence on part location errors
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DOI：
10.1016/j.ijmachtools.2003.10.015
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发表时间：
2004-03
影响因子：
14
通讯作者：
A. Raghu;S. Melkote
中科院分区：
文献类型：
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作者：
A. Raghu;S. Melkote
已知多个与夹具相关的误差源会导致零件定位误差，从而导致零件质量不佳。除了典型的误差源（例如夹具几何误差以及由于夹紧力导致的夹具和零件的弹性变形）之外，所使用的夹紧顺序也会影响零件的位置和方向。在本文中，对夹具-工件系统的夹紧顺序对工件位置误差的影响进行了分析建模，其中考虑了所有主要的柔量源和夹具几何误差。零件位置误差通过零件表面上响应点的位移来量化。提出了一种算法程序，旨在了解当顺序施加夹具时力和变形如何变化。通过模型模拟和实验（以 3-2-1 加工夹具为例），研究了夹紧顺序对零件定位误差和定位器反作用力的影响。
Several fixture-related error sources are known to contribute to part location error, which can lead to poor part quality. In addition to typical error sources, such as fixture geometric error and elastic deformation of the fixture and part due to clamping forces, the clamping sequence used can also influence part position and orientation. In this paper, the effect of clamping sequence on workpiece location error is modeled analytically for a fixture–workpiece system where all major compliance sources and fixture geometric error are considered. Part location error is quantified by the displacement of a response point on the part surface. An algorithmic procedure designed to understand how forces and deformations change as clamps are applied sequentially is presented. The effect of clamping sequence on part location error and locator reaction force is examined through model simulations and experiments via an example involving a 3-2-1 machining fixture.