Errors Analysis And Compensation Of Highprecision Stylus Contact Measuring Instrument Of Screw Thread

High precision is very important to manufacturing equipment and measuring equipment and it also is one of the challenging problems. The precision of stylus contact measuring instrument of screw thread parameters is mainly studied in this thesis, the research provide great potential values and developments because that accuracy study is an indispensable part of the design of manufacturing equipment and measuring equipment.A new method to improve the accuracy of stylus contact measuring instrument is presented in this thesis, which is the organic integration of error modeling, precision design, error measurement and error compensation.At first, 33 items geometrical error of stylus contact measuring instrument is proposed after that its error sources are analyzed deeply in this thesis. Base on the homogeneous coordination conversion, a synthetic model related to 33 items geometrical error is discussed. Then a new complete method to improve the accuracy is proposed according to the feature of comprehensive error of stylus contact measuring instrument. Secondly, A computation model for the sensitivity of those errors is built based on homogeneous transfer matrix and differential matrix. And it evolves into general form that applies to machine tools and measuring instruments based on rational simplification. The simulation calculation result of the sensitivity of stylus contact measuring instrument’s errors illustrates the feasibility and validity of the simplification, and it also provides guiding meaning for precision design of stylus contact measuring instrument. At last, a new method to measure the comprehensive error of the stylus contact measuring instrument is presented, and its related devices are invented in this thesis. Then according to the result of comprehensive error measurement, a new method of error compensation is also presented in detail. It helps to obtain the wanted data of thread contour that can be used to get more accurate thread parameters. In addition, the mathematic deducing and calculation process of error measurement and error compensation are detailed.