• Title/Summary/Keyword: cutting force superposition

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An Analysis of Dynamic Cutting Force Model for Face Milling Using Modified Autoregressive Vector Model (자기회귀 벡터모델을 이용한 정면밀링의 동절삭력 모델해석)

  • 백대균;김정현;김희술
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.17 no.12
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    • pp.2949-2961
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    • 1993
  • Dynamic cutting process can be represented by a closed-loop0 system consisted of machine tool structure and pure cutting process. On this paper, cutting system is modeled as a six degrees of freedom system using MARV(Modified Autoregressive Vector) model in face milling, and the modeled dynamic cutting process is used to predict dynamic cutting force component. Based on the double modulation principle, a dynamic cutting force model is developed. From the simulated relative displacements between tool and workpiece the dynamic force domponents can be calculated, and the dynamic force can be obtained by superposition of the static force and dynamic force components. The simulated dynamic cutting forces have a good agreement with the measured cutting force.

Analysis of Non-uniform Tension Effect on Dynamic Characteristics of Spinning Circular Plates in the Wafer Cutting Machine (웨이퍼 가공기에서 회전 원판의 동특성에 미치는 불균일 장력의 영향 분석)

  • 임경화
    • Journal of KSNVE
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    • v.8 no.2
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    • pp.324-330
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    • 1998
  • The forced vibration analysis of the outer-clamped spinnig annular disk with arbitrary in-plane is formulated to investigate the influence of non-uniform tension on the cutting accuracy of wafer cutting machine. The arbitrary in-plan force along the outer edge of an annular plate is expressed as a Fourier series. Galerkin method and modal superposition method are employed to obtain the forced responses under the static force and the impulse force in astationary coordinate. Through qualitative and quantitative analyses, it can be found that forced and impulse responses are sensitive to the non-uniformity of in-plane force, which can bring a bad effect to the accuracy of wafer cutting process. Also, in case of a spinning disk with non-uniform in-plane force, critical speed is required to define in a different way, compared with conventional definition in axi-symmetrical spinning disk.

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Comparison of precision Machinabilities and Cutting Time in Inclined Milling Process (노우즈반경에 따른 엔드밀의 가공특성 및 절삭시간의 비교)

  • 김병희;최영석;주종남
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.19 no.9
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    • pp.2114-2121
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    • 1995
  • Surface generation model of three types of endmills is introduced to analyse the cutting mechanism of an endmill more accurately. Superposition method is introduced to define the effective cusp including the effects of cutter mark. Through the comparison of three endmills, it is shown that the ball-nose endmill is superior to the ball endmill and the flat endmill for inclined milling process in 3-or 5-axis machining modes. By using the objective function minimizing the machining time, appropriate nose radius is selected for various cutter radiuses and cutter inclination angles.