Research On Machine Tool Error Detection Based On Inclined Circular Path

As an industrial machine,the machining accuracy of CNC machine tool is one of the important signs to evaluate the development level of a country’s manufacturing industry.Accurate and efficient measurement of geometric errors of machine tools is the premise of improving machining accuracy of CNC machine tools.As a measuring instrument to detect machine tool error based on circular measuring method,the ball instrument can obtain more comprehensive machine tool error,which can reflect the comprehensive machining performance of the machine tool.However,due to the characteristics of circular measurement method,when measuring machine tool error with ball instrument,it is necessary to measure the error in three orthogonal planes and combine the measurement results of the three planes to decouple the machine tool error,which not only requires a certain amount of measurement time,but also introduces other error sources,such as repeated positioning error of the machine tool.Therefore,for the sake of accuracy,efficiency and cost,this paper proposes a machine tool error detection method based on inclined circle path(referred to as inclined circle detection method).The detection path of this method requires the simultaneous movement of three linear axes of the machine tool(three-axis linkage),applicable to error detection of multi-axis CNC machine tools.The 21 geometric errors of the three linear axes of the machine tool can be obtained in one measurement by using the inclined circle detection method,which avoids the additional error source introduced by multiple measurements and gives consideration to the detection accuracy and efficiency of the machine tool error.This paper takes the measuring device constructed by the combination of two cue meters(referred to as the combined cue meter)as the means,through the principle analysis,model building and experimental verification,focuses on the machine tool error detection and analysis based on the inclined circle detection method,in order to verify the feasibility and effectiveness of the inclined circle detection method to detect the machine tool error.The main research work of this paper includes:1)Aiming at the limitation of circular measurement method,a new method of machine tool error detection is proposed: inclined circular detection method.The detection path for measuring machine tool error using spatial circle detection method was planned,and the measurement coordinate system based on inclined circle detection method was constructed,and the principle of measuring machine tool error based on inclined circle detection method was analyzed.2)An analytical model of machine tool error based on inclined circle detection method is established.Firstly,integrated geometric error model and single geometric error model of machine tool are established.Secondly,combining with the error detection principle of inclined circle detection method,an analytical model of machine tool error based on inclined circle detection method is obtained.Finally,the influence of the eccentricity error of the cue meter,the Angle error of the inclined table and the inclination error of the combined measuring device on the analytical results of the machine tool error is analyzed,which is used to correct the analytical model of the machine tool error.3)The experimental system was built,and the machine tool error measurement experiment and verification experiment based on the inclined circle detection method were carried out to verify the feasibility and effectiveness of the machine tool error detection based on the inclined circle detection method.The experimental results show that the inclined circle detection method can efficiently measure 21 geometric errors of the linear axis of the machine tool.