作者：宋艳丽（武汉交通职业学院，湖北 武汉 430065）
Exploring the Factors Influencing the Processing Accuracy of CNC Machine Tools by CNC Systems
Song Yanli (Wuhan Technical College of Communications, Hubei Wuhan 430065)
Abstract: [Objective] In order to further improve the comprehensive performance of domestic CNC systems, enhance product competitiveness, and move domestic manufacturing towards high-end and precision manufacturing, it is important to explore the factors that affect the machining accuracy of CNC machine tools by CNC systems. [Method] The author uses Huazhong CNC system and FANUC CNC system to process two-dimensional, three-dimensional hexagonal parts and 3-sphere parts respectively under the same condition of the structure, mechanical hardware and environment of CNC machine tools. Then, the same data points are collected, measured and compared with the time-lapse Zeiss CMM and Renishaw CMM, and the reasons for the different processing accuracy are analyzed. [Result] 1) During the design and processing of measuring parts, there was no reasonable Geodetic datum designed for the use of three coordinates, which caused that three coordinates could not be measured or the overall measurement error was too large. 2) The processing size and surface quality of the Geodetic datum are poor, which directly affects the datum error of establishing the coordinate system during the three coordinate measurement, resulting in the measurement size being too large. 3) Machining with multiple cutters, manual tool setting, etc. will also lead to inconsistency between the processed tool and the Geodetic datum. 4) During machining, there are errors in the parts themselves, such as programming accuracy and model modeling accuracy, which can affect the accuracy of machining dimensions. [Conclusion] The machining accuracy of domestic and foreign CNC systems is basically the same, but in some local machining features, the overall machining design of the CNC system still needs further optimization.
Keywords: CNC system; consistency research; machining accuracy; comparative analysis