Abstract
In this paper, the geometric error modeling and sensitivity analysis method was established to improve the compound machining accuracy of NC machine tools. Use CHD-25 type 9-axis 5 linkage turning-milling compound NC machine tool as a research object, based on the multi-body system theory (MBS), the geometric error modeling method of the machine tool was developed. The model involves 37 items of geometrical errors. By calculating and analyzing the error sensitivity coefficient, the key geometric errors that affect the machining precision are identified finally, which provides an effective theoretical basis for the design of compound CNC machine tools.
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