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Evaluation and Measure of Cylindrical Error

Author: LiuFei
Tutor: PengXiaoNan
School: Henan University of Science and Technology
Course: Measuring Technology and Instruments
Keywords: Cylindricity Chord line intersecting Error evaluation Coordinate Measuring Machine
CLC: TG83
Type: Master's thesis
Year: 2008
Downloads: 422
Quote: 2
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Abstract


Cylindricity error evaluation is one of the four basic elements in the shape of the error detection, an important indicator of the as Evaluation cylinder parts, plays a very important role in the mechanical manufacturing, aerospace and automation testing field. CMM is a wide range of measuring equipment, but so far, the use of the coordinate measuring machine elements of the rotating body bit error measurement has not yet formed a unified evaluation method, which limits the Cartesian coordinate system cylindrical error evaluation of the implementation and application in production. In this paper analyzes the precision measuring cylindricity error evaluation mechanism, the use of space geometry and the relationship between graphical features cylindricity error in the Cartesian coordinate system measurement and evaluation, made some progress. Spatial geometric relations, mathematical simulation modeling, the chord line intersecting relationship characteristic analysis and measurement applications analysis as the main research content presented cylindricity error strings intersecting the evaluation method, in particular on the following aspects: 1. cylindricity error evaluation mathematical model of a Cartesian coordinate system. Cross-section measurement method is based on the Cartesian coordinate system mathematical model for cylindricity error evaluation. The least square cross-section profile curve constructed by any conic mathematical equations, and solved the center of solving the problem. Fitting model of the center of the cylinder axis, the transformed mathematical model more suitable for computer data processing. 2 cross-section the error chord line evaluation. To determine the center of the section method for the determination of the center of the section, the cross-sectional profile feature strings symmetrical relationship. Inclusive circle can be determined based on the geometric characteristic of the relationship between the chord line of the feature point change utilization constraints directions to control the inclusive range of movement of the circle, so as to achieve the purpose of quickly determine the cross-sectional center. 3 cylindricity error evaluation model section evaluation. Section chord line intersecting relationship of the minimum external projection surface data, maximum inscribed the minimum regional evaluation model, and gave details of the three evaluation methods based on the chord line intersecting relationship. And three evaluation method structure made comparison and analysis, to reach minimum external evaluation and the maximum internal evaluation to achieve the purpose of the evaluation of the minimum area. 4.'s Discussion and Analysis of the evaluation. After the experimental data acquisition and analysis, cylindricity error evaluation were summarized. The cross-sectional sampling points, the cylinder section number of samples studied and discussed, and the problems in the evaluation process analysis and research. This article chord line intersecting evaluation mode can quickly search for the location of the evaluation center to avoid the calculation of the step length and direction of the search. The analysis shows that using the geometric relationship between the chord line intersecting the evaluation mode, can achieve high efficiency, precise evaluation of the purpose of the cross-sectional roundness error. Coordinate measuring machine and other measuring instruments using the coordinate sampling error evaluation data on the shape of a cylinder parts.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Tolerance techniques to measure and mechanical measuring instruments > Shaped deviation measurement meter
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