• Title/Summary/Keyword: 볼바

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Error Analysis and Compensation for the Volumetric Errors of a Vertical Machining Center Using Hemispherical Helix Ball Bar Test (반구상의 나선형 볼바측정을 통한 수직형 머시닝 센터의 오차 해석 및 보정)

  • Yang, Seung-Han;Kim, Ki-Hoon;Park, YongKuk
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.9
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    • pp.34-40
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    • 2002

  • Machining accuracy is affected by quasi-static errors of machining center. Since machine errors have a direct influence upon both the surface finish and geometric shape of the finished workpiece, it is very important to measure the machine errors and to compensate these errors. The laser measurement method for identifying geometric errors of machine tool has the disadvantages such as high cost, long calibration time and usage of volumetric error synthesis model. Accordingly, this paper deals with analysis of the geometric errors of a machine tool using ball bar test without using complicated error synthesis model. Statistical analysis method was adopted in this paper for deriving geometric errors using hemispherical helix ball bar test. As a result of experiment, geometric errors of the vertical machining center are compensated by 88%.

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Geometric Errors Estimation of a Rotary Table using Double Ball-bar (볼바를 사용한 회전 테이블의 기하학적 오차 추정)

  • Lee, Kwang-Il;Lee, Dong-Mok;Kweon, Sung-Hwan;Yang, Seung-Han
    • Journal of the Korean Society for Precision Engineering
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    • v.27 no.11
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    • pp.98-105
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    • 2010

  • In this paper, double ball-bar is used to estimate the geometric errors of a rotary table, which includes one-axial motion, two-radial motions and two-tilt motions, except the angular positioning error. To simplify the measurement procedures, three measurement steps have been designed and developed. At each measurement step, one end of the double ball-bar is fixed at the nose of spindle and the other end is located on the rotary table. And specific circular test path is planned to keep the distance between two balls as constant at ideal case. The relationship including the geometric errors of a rotary table and the measured distance between two balls which is distorted by the geometric errors is defined by using ball-bar equation. Each geometric error is modeled as $4^{th}$ order polynomial considering $C^1$-continuity. Finally the coefficients of polynomial are calculated by least-square method. Simulation is done to check the validation of the suggested method considering set-up errors and measurement noise. Suggested method is applied to estimate geometric errors of a rotary table of a 5-axis machine tool.

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(1)펠렛팅의 개념과 펠렛품질에 영향을 주는 요인

  • Ryu, Eun-Ho
    • Feed Journal
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    • v.5 no.11 s.51
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    • pp.104-109
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    • 2007

  • 다볼바이오 류은호 대표는 수년간 연구된 사료 가공기술을 바탕으로 국내사료공장은 물론 해외시장을 대상으로 '가공사료 생산의 효율적 운영' 세미나를 개최 하고 PELLET 컨설팅을 통해 제품의 효율적 운용 방안 및 가공 기술 향상 방향을 제시해왔다. 앞으로 본지를 통해 <펠렛 가공사료에 대한 새로운 고찰> 이라는 주제로 3회(격월간)에 걸쳐 연재할 예정이다.

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