• Title/Summary/Keyword: 체적오차

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기하학적 연쇄에 의한 공작물 형상의 장착오차해석에 관한 연구

  • 신동수;정성종
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1992.10a
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    • pp.223-227
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    • 1992
  • 산업의 발전으로 정밀가공기술 및 측정기술 및 측정기술의 개발에 대한 요구가 급증하고 있으며, 특히 가공전 공작물의 장착정도, 팔레트 교환 위치정도와 가공후 가공정도 및 공작기계 자체의 정도 판별은 생산품의 정밀도와 직접 관계되는 중요한 요인이기 때문에 정확히 규명할 필요가 있다. 본 연구에서는 공작물의 장착오차와 기계오차가 존재하는 경우 Denavit-Hartenberg 접근법에 의하여 레퍼런스에 대한 공간상 linkage의 기하학적 표현을 Matrix Multiplication을 사용하여 Cutting Tool 과 Workpiece에 대한 공간상의 관계를 규명하였으며, 가공에 미치는 체적오차를 규명하고자 한다.

A study of the Volumetric Error Compensation and Virtual Machining System in a Machine Tool (공작기계의 체적오차 보정과 가상가공 시스템에 관한 연구)

  • 양승한
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1998.10a
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    • pp.134-139
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    • 1998
  • The objective of this study is to estimate and to compensate for the volumetric error of a machine tool. In this paper, the volumetric error is defined and error synthesis model is presented. Then, the volumetric error of workpiece is compared through the virtual machining and a new tool-path is generated to compensate for the error in the post-processor of CAM system using the error synthesis model. By this method, the error is compensated without modification or replacement of a machine tool being in use.

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The OMM system for machined form and surface roughness measurement concerned with volumetric error (기계 체적오차가 고려된 가공형상-거칠기 측정 OMM 시스템)

  • 이상준;김선호;김옥현
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.05a
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    • pp.681-686
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    • 2000
  • Machining information such as machined form and surface roughness accuracy is an important factor for manufacturing precise parts. To this regard, OMM(On the Machine Measurement) has been issued for last several decades to alternate with CMM. In this research, measuring system consisting of a laser probe is developed for machined form and surface roughness measurement on the machine tool. The obtained machined form accuracy is compared with reference one defined in CAD model. The measured surface roughness data is compared with measured master surface beforehand. Furthermore, using the pre-defined volumetric error map approach compensates the geometric accuracy of the machine tool. The overall performance is compared with CMM, and verified the feasibility of the measurement system.

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The OMM System for Machined Form and Surface Roughness Measurement Concerned with Volumetric Error (기계 체적오차가 고려된 가공형상-거칠기 측정 OMM 시스템)

  • 이상준;김선호;김옥현
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.7
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    • pp.232-240
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    • 2000
  • Machining information such as machined form and surface roughness accuracy is an important factor for manufacturing precise parts. To this regard, OMM(On the Machine Measurement) has been issued for last several decades to alternate with CMM. In this research, measuring system consisting of a laser probe is developed for machined form and surface roughness measurement on the machine tool. The obtained machined form accuracy is compared with reference one defined in CAD model. The measured surface roughness data is compared with measured master surface beforehand. Furthermore, using the pre-defined volumetric error map approach compensates the geometric accuracy of the machine tool. The overall performance is compared with CMM, and verified the feasibility of the measurement system.

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Volumetric Error Compensation of a 3-Axis Horizontal Machining Center in the Post-processor (후처리기에 의한 3축 수평머시닝센터의 체적오차보정)

  • 양승한;권성환
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.8 no.3
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    • pp.28-34
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    • 1999
  • The objective of this study is to estimate and to compensate far the volumetric error of a workpiece influenced by the geometric error of a machine tool. In this paper, the volumetric error is defined and the error synthesis model is presented. Then, the volumetric error of workpiece is calculated and compared through the simulation, and a new tool-path is generated to compensate for the error in the post-processor of CAM system using the error synthesis model. By this method, the error is compensated without modification or replacement of a machine tool being in use.

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Volumetric Error Identification for NC Machine Tools Using the Reference Artifact (기준물을 이용한 NC 공작기계의 체적오차 규명)

  • Kim, Gyeong-Don;Jeong, Seong-Jong
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.12
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    • pp.2899-2908
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    • 2000
  • Methodology of volumetric error identification is presented to improve the accuracy of NC machine tools by using a reference artifact and a touch trigger probe. Homogeneous transformation matrix and kinematic chain are used for modeling the geometric and thermal errors of a three-axis vertical machining center. The reference artifact is designed and fabricated to identify the model parameters by machine tool metrology. Parameters in the error model are able to be identified and updated by direct measurement of the reference artifact on the machine tool under the actual conditions which include the thermal interactions of error sources. The proposed method can speed up and simplify volumetric error identification processes.

복합재료 미시역학적 전산모형의 혼합 법칙을 통한 검증

  • Yang, Ye-Ji;Son, Myeong-Jin;Cheon, Jae-Hui;Sin, Ui-Seop
    • Proceeding of EDISON Challenge
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    • 2017.03a
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    • pp.236-240
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    • 2017
  • 다양한 분야에서 복합재료의 중요성이 강조되면서 각각의 재료 특성에 따른 물성을 미시역학적으로 구하는 것에 대한 다양한 방법이 제시되고 있다. 본 논문에서는 5개의 혼합 법칙을 선정하여 전산구조해석을 통한 유한요소해석을 비교 검증한다. 그 과정에서 산출된 결과를 통하여 복합재료의 탄성거동의 오차가 1% 미만인 것을 확인하였고, 프로그램의 해석이 적절하다는 것을 검증하였다. 또한 프로그램과 가장 유사한 혼합 법칙이 무엇인지 확인하고, 체적 비에 따른 오차를 비교하여 가장 적합한 체적 비를 선정하였다.

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Error Synthesis Modeling and Compensation Algorithm of a 5-Axis CNC Machine Tool (5축 CNC 공작기계의 오차합성모델링 및 보정 알고리즘)

  • Yang, Seung-Han;Lee, Chul-Soo
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.8
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    • pp.122-129
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    • 1999
  • A 5-axis CNC machine tool is more useful compared with a 3-axis machine tool, because the position and the orientation of a tool tip can be controlled simultaneously. Unlike the 3-axis machine tool, the 5-axis machine tool has the volumetric position error and volumetric orientation error due to the quasi-static error of each machine tool joint which is a major source of machined part error. So, the generalized error synthesis model of the 5-axis CNC machine tool was developed to predict and to compensate for the volumetric position error and the volumetric orientation error. It was proposed that a compensation algorithm to correct simultaneously the volumetric position error and the volumetric orientation error of the 5-axis CNC machine by error inverse kinematic.

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Analytical Sensitivity Analysis of Geometric Errors in a Three-Axis Machine Tool (해석적 방법을 통한 3 축 공작기계의 기하학적 오차 민감도 분석)

  • Park, Sung-Ryung;Yang, Seung-Han
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.36 no.2
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    • pp.165-171
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    • 2012
  • In this paper, an analytical method is used to perform a sensitivity analysis of geometric errors in a three-axis machine tool. First, an error synthesis model is constructed for evaluating the position volumetric error due to the geometric errors, and then an output variable is defined, such as the magnitude of the position volumetric error. Next, the global sensitivity analysis is executed using an analytical method. Finally, the sensitivity indices are calculated using the quantitative values of the geometric errors.