Calibration For Non-Contact Cutting-tool Geometry Parameter Measuring Instrument

In recent years, non-contact cutting-tool geometry parameter measuring instrument has been widely used in development and production of cutting tools. The cutting-tool technology research institute of Dalian Polytechnic University has developed an image processing based cutting-tool geometry measurement apparatus. After years of continuous development, the measuring instrument has become molded products on the market, and has good cost performance and market competitiveness. However, now the measuring instrument does not have a complete set of measurement calibration system, so the size of the error values in the process of product testing is not a definite reference standard.In this paper, selected from the system hardware, calibration fixture design, assembling and adjustment, as well as software compensation,several aspects of the work.The production model for DJCLY12 A measurement instrument made by Dalian Jerry cutting-tool technology co.,LTD as the experiment instrument,based on previous studies and on the basis of the checkerboard calibration template to test for the standard parts, using grating ruler with zero reference point to determine calibration system absolute zero point, through the data collection of two axes X, Y, determine the measurement system error values,. Choosing the appropriate mathematical model for measuring error, using the way of software programming to go to the error compensation to the software of the system, eventually improve the precision of the measuring instrument.Through the analysis of experimental results prove that the calibration experiments the design and selection of software and hardware system can achieve the desired goal,within X 180 mm range cumulative error reduced from 0.037 mm to 0.037 mm, within Y 81 mm range the scope of cumulative error reduced from 0.012 mm to 0.012 mm, and accumulative error of two axes becomes linear growth into smooth fluctuations within a certain range.