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

A Fast Precision Evaluation Equipment for CNC Machine Tools

Author TianZuo
Tutor LiBin
School Huazhong University of Science and Technology
Course Mechanical and Electronic Engineering
Keywords CNC machine tools Accuracy Assessment Step Gauge Measurement error
Type Master's thesis
Year 2011
Downloads 40
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CNC machine tool accuracy assessment is a key part of the error compensation . Existing CNC machine tool accuracy assessment methods there are some limitations, most of the installation and commissioning of a long time , the measurement of low efficiency , and expensive , to make large quantities of low-grade CNC machine tools debugging and accuracy evaluation of the application has been limited . In this paper, precision , accuracy evaluation of the mass production of low - grade CNC machine tools factory , as well as use and maintenance , a step away from regulation and inductance micrometer combination precision CNC machine tools to quickly assess the analysis of measurement error . The the sensor mechanical device installation error , sensor pose error regulatory step away from the installation position and orientation error , step away from the regulation of the heat distortion error , step away from the regulations affected by the installation force errors caused by factors such as the measurement results , design the corresponding measurement error compensation algorithm and experimental verification of these compensation algorithm . The test results show that the the sensor mechanical device installation error compensation algorithm accuracy up to 99% , the sensor installation pose error compensation algorithm accuracy up to 98% , the step gauge installation pose error compensation accuracy of up to 1 μm , step away from the regulatory heat distortion error compensation The accuracy of 2μm. Design a special fixture to facilitate quick installation step gauge CNC lathe X axis . On the basis of the results of the above study , the development of hardware and software , rapid assessment device developed by the accuracy of CNC machine tools . The device on in Minimill and CK6136S a series of experimental verification , the accuracy and efficiency comparison with the laser interferometer measurement results , the test results show that the device can measure the CNC machine tool positioning error and backlash , and automatic generation of error compensation files , pitch error compensation of CNC machine tools . The device measurement accuracy by the feed rate was less affected , measurement precision of CNC milling up to 2 ~ 3μm, measurement the lathes accuracy up to of 3 ~~ 4 μm can meet the accuracy requirements of the low-grade CNC machine tools measuring measuring the efficiency of a laser interferometer can improve two to three times .

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