Research on evaluation methods of cnc machine tool machining consistency

According to the connotation of machining consistency, a method is proposed for evaluating the machining consistency of CNC machine tools by utilizing the fluctuation degree of technical indicators in this paper. Firstly,the methods of absolute fluctuation method and relative fluctuation method are derived and calculated in detail. To address the inclusion of multiple indicators in actual machining accuracy, a multi-index evaluation model is established, and the dimensionless processing is conducted using the CRITIC valuation method. The objective weight of each indicator is determined by calculating the correlation coefficient matrix and information content; subsequently, the comprehensive consistency evaluation result is obtained by weighting and summing the volatility of each indicator. To verify the feasibility of the evaluation method, a consistency study is performed on CNC machine tools. Several key accuracy indicators for typical machining parts were selected, the fluctuation of individual indicators and the comprehensive consistency of multiple indicators were evaluated, and different applicable methods for different accuracy indicators were proposed. Finally, the evaluation rules for machining consistency of CNC machine tools are summarized, providing a unified quantitative technical means for evaluating the consistency level of the same type of machine tool products.