• 제목/요약/키워드: 정면밀링

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정면밀링용 공정의 최상설계에 대한 시뮬레이션

  • 김정현;김희술
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2001년도 추계학술대회 논문집
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    • pp.57-62
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    • 2001
  • 밀링은 회전공구를 사용하여 금속을 제거하는 효율적인 방법으로, 특히 수직밀링은 고능률절삭의 이점 때문에 널리 사용되는 금속절삭 가공방법중의 하나이다. 그러나 밀링커터는 단속절삭 공구로서 절삭 날의 단속절삭작용에 의한 변동절삭력과, 여러 날의 동시가공에 의한 절삭력의 교란 때문에 가공능률, 가공정밀도, 기계와 공구의 수명향상에 문제가 되어 왔다. 이러한 문제점들을 해결하기 위하여 기계설계자들은 절삭력의 교란에 의하여 일어나는 진동을 줄이기 위하여 기계구조의 강성을 증가시켰으나 이석은 고비용을 필요로 하게 되므로 공구 형상을 개선하여 안정된 절삭을 시도하였다.

정면밀링가공에서 쟁기력을 고려한 3차원 절삭력 모델링 (A Mechanistic Model for 3 Dimensional Cutting Force Prediction Considering Ploughing Force in Face Milling)

  • 권원태;김기대
    • 한국공작기계학회논문집
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    • 제11권2호
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    • pp.1-8
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    • 2002
  • Cutting force is obtained as a sum of chip removing force and ploughing force. Chip removing force is estimated by multiplying specific cutting pressure by cutting area. Since ploughing force is caused from dullness of a tool, its magnitude is constant if depth of cut is bigger than a certain value. Using the linearity of chip removing force to cutting area and the constancy of ploughing force regardless of depth of cut which is over a certain limit each force is separated from measured cutting force and used to establish cutting force model. New rotation matrix to convert the measured cutting force in reference axes into the forces in cutter axes is obtained by considering that tool angles are projected angles from cutter axes to reference axes.. Spindle tilt is also considered far the model. The predicted cutting force estimated from the model is in good agreement with the measured force.

정면밀링가공에서 인서트의 챔퍼각 변화에 의한 표면거칠기 향상 (Improvement of the Surface Roughness by Changing Chamfered Angle of the Insert in Face Milling)

  • 권원태;이성세
    • 한국정밀공학회지
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    • 제18권7호
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    • pp.155-160
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    • 2001
  • A milling process with 45 degree chamfered inserts produces a perfect flat surface only in theory. It is due to many unwanted factors including thermal effect, dynamic effect, the problem of the controller used and the problem of accuracy of the machine tool. In this study, introduced is a method to improve the surface roughness by redesigning of the chamfer angle of the insert, which traditionally has been 45 degree. First, the relationship between the fixed machine coordinate and the relative coordinate on the insert is derived. This transfer matrix is used to determine the new insert angle to maximize the flatness of the machined surface. A newly designed insert is manufactured, and used to carry out the experiment. It is proved that she insert designed by the proposed method produced a much flatter surface than a traditional one.

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정면밀링공정에서 공구상태 변화를 고려한 절삭력예측 모델의 개발 (Development of mechanistic model for cutting force prediction considering cutting tool states in face milling)

  • Lee, S.S.;Kim, H.S.;Lee, Y.M.
    • 한국정밀공학회지
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    • 제12권11호
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    • pp.63-73
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    • 1995
  • A mechanistic force system model considering the flank wear for the face milling process has been developed. The model predicts variation of the cutting forces according to flank wear in face milling over a range of cutting conditions, cutter geometries and cutting process geometries including relative positions of cutter to workpiece and rounouts. Flycutting and multitoth cutting teste were conducted on SS41 mild steel with sintered carbide tool. In order to verify the mechanistic force model considering the flank wear of cutting tools, a series of experiments was performed with single and multitooth cutters in various cutting conditions. The results show good agreement between the predicted and measured cutting force profiles and magnitudes in time and frequency domains.

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정면밀링가공시 공구 파손 검출에 관한 실험적 연구 (An Experimental Study onthe Detection of Tool Failure I Face Milling Processes)

  • 김우순
    • 한국생산제조학회지
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    • 제5권3호
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    • pp.73-79
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    • 1996
  • In this paper present a new technique (strain-telemetering)for detection of coated tool failure in face milling processes. In the cutter body the strain signals received fro the transmitter is transformed in to frequency modulation(FM) signals in face milling processes. A receiver which is place near by the Vertical milling machine receives the FM signals, then the signals will be sent to a computer which determines whether th tool is failure. And machined surface of workpiece is detected by the SEM. In this paper, A on-line monitoring of the tool failure detection system based on the strain -telemetering apparatus has bee represented.

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인공신경망을 이용한 정면밀링에서 이상진단에 관한 연구 (A Study on Fault Diagnosis in Face-Milling using Artificial Neural Network)

  • 김원일;이윤경;왕덕현;강재관;김병창;이관철;정인룡
    • 한국기계가공학회지
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    • 제4권3호
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    • pp.57-62
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    • 2005
  • Neural networks, which have learning and self-organizing abilities, can be advantageously used in the pattern recognition. Neural network techniques have been widely used in monitoring and diagnosis, and compare favourable with traditional statistical pattern recognition algorithms, heuristic rule-based approaches, and fuzzy logic approaches. In this study the fault diagnosis of the face-milling using the artificial neural network was investigated. After training, the sample which measure load current was monitored by constant output results.

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정면밀링에서 공구마멸 패턴과 메커니즘 분석에 관한 연구 (A Study on the Analysis of Tool-wear Patterns and Mechanisms in Face Milling)

  • 장성민;백승엽
    • 한국기계가공학회지
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    • 제16권4호
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    • pp.24-29
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    • 2017
  • This paper provides an experimental analysis on the breakage of the coated tool using the face-milling cutter of the machining center due to changes in the cutting speed and the feed rate. The experimental studies were conducted using STS 304 materials and the damage to the tool was analyzed according to the change in machining time. The experiments confirmed that the cutting speed and feed rate affected the tool damage and the mechanical impact and thermal shock were determined to severely damage the tool. From the production engineering point of view, it has been experimentally investigated that the increased feed rate significantly influences the material removal rate more than the increased cutting speed.

정면 밀링의 절삭력 해석을 위한 평균 비절삭저항 모델의 개발 (Development of mean specific cutting pressure model for cutting force analysis in the face milling process)

  • Lee, B.C.;Hwang, J.C.;Kim, H.S.
    • 한국정밀공학회지
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    • 제11권4호
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    • pp.13-25
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    • 1994
  • In order to design and improve a new machine tool, there is a need for a better understanding of the cutting force. In this paper, the computer programs were developed to predict not only the mean specific cutting pressure but also the cutting force. The simulated cutting forces in X, Y, Z directions resulted form the developed cutting force model were compared with the measured cutting forces in the time and frequency domains. The simulated cutting forces resulted from the new cutting force model have a good agreement with the measured force in comparison with these resulted from the existing cutting force model.

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평판의 정면밀링 가공에서 발생하는 채터 (Chatter in Plate Milling with a Face Mill)

  • 이상민;이영수;주종남
    • 한국정밀공학회지
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    • 제21권5호
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    • pp.46-54
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    • 2004
  • A cutting force model predicting the dynamic force induced by the axial vibration of it plate in face milling is introduced. When a plate face is milled, deformation in tool axial direction is considerable. Therefore, cutting forces are affected by not only inner-outer modulation in feed direction but also by axial deformation. A PTP (peak-to-peak) diagram made by the simulated dynamic force model is evaluated. The stability of the face milling process such as the chatter outset, and the stable cutting region can be simply estimated. Simulation results are compared with that of experiment.

3축방향의 비절삭 계수를 이용한 정면 밀링 절삭력 모델 개발 (Development of Cutting Force Model for Face Milling Operation Using 3-Directional Specific Cutting Force Coefficients)

  • 김희술;이상석
    • 한국정밀공학회지
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    • 제8권1호
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    • pp.116-129
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    • 1991
  • A cutting force model for face milling operation using 3-directional specific cutting force coefficients is developed. The model is taken into consideration factors such as cutter geometry, machining conditions, spindle eccentricity, insert initial postion errors, etc. The simulated force in X, Y, Z directions from the model are subsequently compared with measured forces in the time and frequency domains. The simulated forces have a good agreement with measured forces.

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