Journal of the Korean Society for Precision Engineering (한국정밀공학회지)
- Volume 10 Issue 2
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- Pages.54-65
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- 1993
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- 1225-9071(pISSN)
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- 2287-8769(eISSN)
A development of accuracy diagnostic system 2-dimensional circular interpolation of machining centers
Machining Center의 2차원 원호보간정밀도 진단 System의 개발
- Kim, Jeong-Soon ;
- Namgung, Suk ;
- Tsutusmi, Masacmi
- 김정순 (충남대학교 대학원) ;
- 남궁석 (충남대학교 기계공학과) ;
- 제정신 (동경농공대학 기계시스템공학과)
- Published : 1993.06.01
Abstract
The paper describes and alternative method based on a new idea to measure the circular movement of machining centers. ISO has employed three testing methods for the acceptance tests of machine tools; the first is a rotating one-dimensional probe method, the second is a two-dimensional probe and a master circular ring, and the third is a kinematic ball bar. The last two methods were proposed and introduced by W. Knapp and J. B. Bryan, respectively. The newly developed method is superior to above two methods; the rotating angle can be detected and the rotating radius is variable. Circular movement errors of machining centers were investigated by the analysis of data measured by R- .THETA. method. Followint observations are obtained 1) The errors which depend on positions, i.e., periodical errors by the pitch of ball screws, errors by compensation of backlash and errors by perpendicularity of X and Y-axis, were analyzed. 2) The errors which depend on NC control system, i.e., errors by the unbalance of position-loop-gaians, errors by velocity-loop-gains and errors by feed speeds, were quantiatively analyzed. 3) The method of extracting error information, which uses moving technique of averaging angle and fourier's analysis data mesured by the R- .THETA. method, was proposed.
Keywords
- Circular Movement;
- machining center;
- one-dimensional probe;
- two-dimensional probe;
- R-$\theta$;
- rotation angle;
- ball screws;
- backlash;
- perpendicularity;
- position-loop-gain;
- velecity-loop-gain;
- technique of averaging angle