• Title, Summary, Keyword: Roundness

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A Study on the Comparison of Least Squares Roundness with Minimum Zone Roundness (진엔도 평면법에 있어서 최소자승법과 최소영역법의 비교)

  • Kang, Myung-Soon;Han, Eung-Kyo;Kwon, Dong-Ho
    • Journal of the Korean Society for Precision Engineering
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    • v.2 no.3
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    • pp.59-69
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    • 1985
  • The purpose of this paper is to investigate the variations of out-of- roundness due to its assessment methods for the practical workpieces. Experiments were carried out with the test specimens having the typical roundness profile. The roundness measuring system which has the autocentripetal functions and the automatic centering table unit was used. From the experimental results, it was found that the ratio of LSC to MZC values varied with the shape of roundness profiles, and the rate of variation for out-of-roundness was increased logarithmically with the increment of undulations by the effect of filter. Therefore, it is suggested that the least squares center method should be useful with the sufficient accuracy except for some special cases in the roundness profiles, and the condition of filter has considerable influence upon the out-of-roundness to be measured.

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A Study on the Measurement of Circularity and Perpendicularity Using Circular Test Method (CT법을 이용한 진원도 및 직각도 측정에 관한 연구)

  • 주만식
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.75-81
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    • 2000
  • This study for the roundness and perpendicularity of machining center is classified into two ways. One is the way that progresses the roundness amending the parameter of machining center based on the measured value after the measurement of the roundness of machaning center by means of a existing measuring device, another is the way that measures the roundness by remodeling the existing measuring device. the former is studied by pack hei jae team in Seoul university, the later is studied by TSUTSUMI. Especially TSUTSUMI measures the roundness according to circular compensation after the insertion of developed measuring device using a rotary encoder to the spindle of machining tool. we study how regulation velocity occuring with circular motion of machining center table influences the roundness after measuring the roundness using Circular Test method by a 2 dimention probe and a standard discus in this experiment.

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A Study on the Improvement of Circularity Measurement Using Circular Test Method (CT법을 이용한 진원도 측정 방법의 개선에 관한 연구)

  • 주만식
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.446-451
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    • 1999
  • A study for the roundness of machining center is classified into two ways. one is the way that progresses the roundness amending the parameter of machining center based on the measured value after the measurement of the roundness of machining center by means of a existing measuring device, another is the way that measures the roundness by remodeling the existing measuring device. The former is studied by pack hei jae team in Seoul university, the latter is studied by TSUTSUMI. Especially TSUTSUMI measures the roundness according to circular compensation after the insertion of developed measuring desire using a rotary encoder to the spindle of machining tool. We study how regulation velocity occuring with circular motion of machining center table influences the roundness after measuring the roundness using Circular Test method by a 2 dimention probe and a standard discus in this experiment.

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The Study of Precision measurement by the 3-Point Method (3점식 정도측정에 관한 연구)

  • 전승윤;이영진;정영일;배종일;이만형
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.607-612
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    • 2000
  • Roundness measurement method using three displacement sensors makes in-process roundness measurement possible on the NC machine because it eliminates the vibration signal and eccentricity signal from measured roundness signal from the workpiece. But if measured signals contain noises, high precision measurement of the roundness isn't possible. In this study, a high precision in-process roundness measurement system is developed, which applies a Kalman filter to the roundness measurement method using three displacement sensors and can be used to measure vibration of the spindle.

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칼만필터를 이용한 3점식 정도측정에 관한 연구

  • Lee, Yeong-Jin;Joun, Seung-Yun;Jung, Keum-Young;Kim, Jong-Hwa;Bae, Jong-Il;Lee, Man-Hyung
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.2
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    • pp.72-78
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    • 2001
  • Roundness measurement method using three displacement sensors makes in-process roundness measurement possible on the NC machine because it eliminates the vibration signal and eccentricity signal from measured roundness signal from the workpiece. But there are noises in measured signals, it isn't possible to measure the roundness with high precision. In this study, a high precision in-process roundness measurement system is development, which can eliminate vibrations of the spindle by using three displacement sensors and which can also estimate the noisy roundness measurement signals by applying Kalman filter.

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Roundness Modelling by Fractal Interpolation (프랙탈 보간에 의한 진원도 모델링)

  • Yoon, Moon-Chul;Kim, Byung-Tak;Chin, Do-Hun
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.15 no.3
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    • pp.67-72
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    • 2006
  • There are many modelling methods using theoretical and experimental data. Recently, fractal interpolation methods have been widely used to estimate and analyze various data. Due to the chaotic nature of dynamic roundness profile data in roundness some desirable method must be used for the analysis which is natural to time series data. Fractal analysis used in this paper is within the scope of the fractal interpolation and fractal dimension. Also, two methods for computing the fractal dimension has been introduced which can obtain the dimension of typical dynamic roundness profile data according to the number of data points in which the fixed data are generally lower than 200 data points. This fractal analysis result shows a possible prediction of roundness profile that has some different roundness profile in round shape operation.

A Study on the Measurement and Evaluation of LSC Roundness by Index Head (INDEX HEAD를 이용한 절대 진원도의 측정 평가에 관한 연구)

  • Lee, Dong-Ju
    • Journal of the Korean Society for Precision Engineering
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    • v.8 no.3
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    • pp.18-26
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    • 1991
  • A study on the measuring and evaluation of LSC(Least Square Center) roundness was carried out. The experimental set-up was made by index head and indicator, and the measuring data were compensated by a developed computer program. The results obtained are as follows : 1) An index head can conveniently be used to measure LSC roundness. 2) A program for calculating LSC roundness is developed. 3) Without a high quality roundnes measuring apparatus, LSC roundness can be measured and calculated by using index head and the developed program in machine shop as well as in a measuring room

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A Study for the Roundness Estimation (진원도 형상 추정 연구)

  • Kim, Soo-Kwang;Jun, Jae-Uhk
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.10 no.2
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    • pp.38-45
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    • 2011
  • The criteria for determining the elements are the minimum zone method(MZM) and the least squares method(LSM). The LSM is deterministic and simple but is limited at the measurements whose errors are significant compared with form errors. For the precise condition, minimum zone method(MZM) has been selected to determine the elements. The roundness is the fundamental problem in the evaluating form errors. In this paper, anew approach adapting the genius education concept is proposed to obtain an accurate results for the MZM and the LSM of the roundness. Its computational algorithm is studied on a set of measured sample data. To be of almost no account of the specification(the number and the standard deviation etc.) of the sanple data, the results shoqs excellent reliability and high accuracy in estimating the roundness.

Machining Precision according to the Change of Feedrate when Ball Endmilling of Semisphere Shape (볼 엔드밀에 의한 반구 가공시 이송속도 변화에 따른 가공정밀도)

  • 임채열;우정윤;김종업;왕덕현;김원일
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.930-933
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    • 2000
  • Experimental study was conducted for finding the characteristics of machining precision according to the change of feedrate when ball endmilling of semisphere shape. The values of tool deflection and cutting force were measured simultaneously by the systems of eddy-current sensor and dynamometer. The machining precision was analyzed by roundness values, which were deeply relating with tool deflection and forces. the roundness was decreased in down-milling than in up-milling for each feedrate. As the cutting edge is moved to radius direction on the tool path, the tool deflection and the cutting force were seemed to be decreased. As the tool path was moved downward, the values of roundness, cutting force and tool deflection were obtained better ones. When compared the values of roundness, cutting force and tool deflection for different feedrate, the best machining accuracy was obtained at feed rate of 90mm/min in down-milling.

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