Dimensional Errors of Fixtures, Locating and Measurement Datum Features in the Stream of Variation Modeling in Machining
Dimensional Errors of Fixtures, Locating and Measurement Datum Features in the Stream of Variation Modeling in Machining
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DOI：
10.1115/1.1621424
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发表时间：
2003-11
影响因子：
4
通讯作者：
D. Djurdjanović;J. Ni
中科院分区：
文献类型：
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作者：
D. Djurdjanović;J. Ni
加工过程通常是多工位的过程，涉及大量的操作和多次定位基准的变化。因此，加工误差在工件加工过程中被引入、转化和积累。本文介绍了夹具误差、定位基准特性误差和测量基准特性误差对加工尺寸误差影响的表示方法。这些程序是必不可少的，在使用CAD/CAPP参数的加工过程中的尺寸加工误差的变异流模型的推导。变量流模型的线性状态空间形式允许在多工位加工问题的正式解决方案中采用先进的控制理论成果。本文提出的建模方法在汽车缸盖加工中得到了实验验证。
Machining processes are usually multi-station processes involving a large number of operations and several locating datum changes. Machining errors are thus introduced, transformed and accumulated as the workpiece is being machined. This paper introduces procedures for expressing the influence of errors in fixtures, locating datum features and measurement datum features on dimensional errors in machining. These procedures are essential in the derivation of the Stream of Variation model of dimensional machining errors using the CAD/CAPP parameters of the machining process. The linear state space form of the Stream of Variation model allows for advanced control theory achievements to be employed in formal solutions to problems in multi-station machining. Modeling procedures presented in this paper were experimentally verified in machining of an automotive cylinder head.