Research On In-situ Measurement Technology Of Straightness And Roundness Of Roller Mold

The micro-structured functional surfaces processed by roller mold stamping technology have been widely used in liquid crystal displays,solar cells and other products in recent years.Since roller mold is the key technical component of roller mold stamping machine,the processing of it determines the precision and quality of the micro-structured functional surface processed by roller mold stamping machine.Therefore,high precision measurement is essential for the processing of roller mold.However,due to the large quality of roller mold,it is not easy to measure offline,and when performing in-suit measurement,the straightness error of machine rails and spindle rotation error will affect the measurement accuracy.Therefore,error separation method is needed in the in-situ measurement.The application of in-situ shape measurement technology of roller mold is the key for the study of roller mold to achieve high accuracy.To better improve measurement efficiency,measurement accuracy and reduce measurement costs.In this paper,a new measurement system was created based on the successive two-point,multi-probe error separation method and parallel three-point error separation method to achieve high-precision in-situ measurement of straightness and roundness of roller molds.The new measurement system utilizes the extremely high resolution and repeatability of flexible hinges as well as the high frequency response of voice coil motors to enableth the function of multi-probe scanning measurement.After the study of measurement methods and the experiment of in-situ measurement of straightness and roundness of roller molds based on the new measurement system,the paper verified the effectiveness of the research method.Therefore,the main research work of the paper are as follow:First of all,analyzing the existing in-situ measurement of roller molds using error separation method,which includes analyzing the principle of measuring the straightness of roller mold using the two-point method and the multi-probe error separation method,and then come up with the single probe shear scanning method.Moreover,study and analyze the principle of measuring the roundness of roller molds by using the parallel three-point method,and then come up with the single probe parallel three-point method to apply to the in-suit measurement of the roundness of roller molds.Secondly,the in-situ measurement platform is designed and built.A shear platform consisting of a flexible hinge and a voice coil motor is designed,the measurement platform control system is designed to realize the overall control of the measurement platform.Based on in-situ measurement methods in the study and designed measurement platforms,the research analyzes the sources of measurement errors.The MATLAB programming simulation was used to analyze the influence of various errors on the straightness and roundness measurement,which verify the feasibility of the entire measurement system.Finally,after debugging and optimizing the measurement system,the research conducts in-situ measurement experiments of roller molds to measure the straightness and roundness error and the reproducibility errors.By using the direct scanning measurement method to preform the experiments of the straightness and roundness of roller molds and the free-form workpiece experiments,the research verifies that the measurement method and measurement system studied in this paper can achieve high accuracy in-situ measurement.