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中文摘要：
机床已经成为工业领域不可缺少的加工工具，特别是多轴机床的出现改变了传统的加工方式。针对如何提高多轴数控机床的精度展开研究，应用多体理论建立了通用多轴数控机床误差模型，在此基础上，给出了多轴数控机床平移和转动数控精密指令求解方法。并以C-A型五轴数控机床为例，采用迭代的方法求出了回转角的精密指令值。
英文摘要：
How to improve the machining accuracy of multi-axis CNC machine tools with least investment is the hot spot of today＇s social research. In order to solve the problem, modifying the instructions of NC machine to improve the accuracy is the most effective method. The multi-axis CNC machine tool was analyzed with multi-body theory. The general error model of multi-axis CNC machine tools was established. Based on these, a thorough study on rotary error was made. Taking C-A type machine tool as example, the in- terative solution method was used to get the precise NC instructions of rotary angle.
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