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Rapid Measuring Device of Position Error for NC Machine Tools

Author: WuDanDan
Tutor: LiBin
School: Huazhong University of Science and Technology
Course: Mechanical and Electronic Engineering
Keywords: CNC machine tools Positioning error Relay measurement Error Calibration Step Gauge
CLC: TG659
Type: Master's thesis
Year: 2007
Downloads: 246
Quote: 2
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Abstract


At present, the existing commercial CNC machine tools have pitch error compensation function . Usually in the CNC machine tool factory , you need to be fully corrected installation , pitch error compensation files and write in the CNC system . The presence of a certain deviation, after a period of use , the machine user , the processing position and the instruction control to a desired position on the machine necessary to recalibrate . Therefore, a simple , fast and low-cost error calibration device is particularly necessary , especially for mass production and consumption , and low-grade economical CNC . In this paper, do the following work . The positioning error sources of error , the positioning error detection needs , for the lack of positioning error detection methods , the development of a benchmark step gauge and inductance micrometer for measuring instrument error calibration device and calibration software. The device can realize the automatic generation of measurement procedures , automatically collecting error data , automatic accuracy evaluation and compensation files automatically generated feature a high degree of automation , greatly improving the calibration efficiency . The basic nature of the CNC machine tool positioning errors , put forward on this basis, the step gauge relay measurements to solve the range of measuring instruments is not enough and the contradiction between the large stroke of the machine axis measurement , and analysis of the the relay measurements measurement accuracy and error accumulation law . The results show that , the relay an increase in the number of the measurement error increases , but the small percentage measurement error in the positioning error and still meet the error compensation requirements . Finally, using the device on the machine three mutually perpendicular axes X, Y and Z-axis error calibration , and made a precision evaluation . A measurement result of the use of the device with the linear grating for comparison, the same position error value of the deviation is less than 4μm, indicates the calibration accuracy of the apparatus to meet the requirements of the low grade economical CNC measured error data can be used for error compensation .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal cutting and machine tools > Program control machine tools, CNC machine tools and machining
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