• Title/Summary/Keyword: Dynamic cutting force

Search Result 105, Processing Time 0.029 seconds

Machine tool identification under actual cutting process by DDS analysis (DDC방식에 의한 공작기계 절삭 특성 규명)

  • ;;Lee, Chong Won
    • Transactions of the Korean Society of Mechanical Engineers
    • /
    • v.5 no.4
    • /
    • pp.303-311
    • /
    • 1981
  • Machine tool dynamics is investigated under actual working conditions. Experimental evaluation of cutting dynamics in a lathe is made with cutting conditions and cutting positions varied. The thrust force and the toolpost and tailstock accelerations during turning process are modelled and analyzed by employing Dynamic Data System methodology. It is found that two acceleration signals are good enough to replace the thrust force, when used for machine tool identification under cutting process and for chatter detection.

A Study on the Instantaneous Shear Plane Based Cutting Force Model for End Milling (엔드밀링에서 순간전단면을 이용한 절삭력 모델 연구)

  • Hong, Min-Sung
    • Transactions of the Korean Society of Machine Tool Engineers
    • /
    • v.11 no.4
    • /
    • pp.34-43
    • /
    • 2002
  • The purpose of this paper is to further extend the theoretical understanding of the dynamic end milling process and to derive a computational model to predict the milling force components. A comparative assessment of different cutting force models is performed to demonstrate that the instantaneous shear plane based formulation is physically sound and offers the best agreement with experimental results. The procedure f3r the calculation of the model parameters used in the cutting force model, based on experimental data, has been presented. The validity of the proposed computational model has been experimentally verified through a series of cutting tests.

A Study on the Detection of Chatter Vibration using Cutting Force Measurement (절삭력을 이용한 채터의 감지에 관한 연구)

  • 윤재웅
    • Journal of the Korean Society of Manufacturing Technology Engineers
    • /
    • v.9 no.3
    • /
    • pp.150-159
    • /
    • 2000
  • In-process diagnosis of the cutting state is essential for the automation of manufacturing systems. Especially when the cutting process becomes unstable it induces self-exited vibrations a frequent case of poor tool life rough surface finish damage to the workpiece and the machine tool itself and excessive down time. To ensure that the cutting process main-tains stable it is highly desirable to have the capability of real-time. To ensure that the cutting process main-tains stable it is highly desirable to have the capability of real-time monitoring and controlling chatter. This paper describes the detection method of chatter vibration using cutting force in turning process. In order to detect a chatter vibra-tion the dynamic fluctuation of radial force is analyzed since this components is sensitive to the chatter. The envelope sig-nal of radial force has been calculated by the use of FIR Hilbert transformer and it was useful to classify the chatter signal from the dynamically unstable circumstances. It was found that the mode and the mode width were closely correlated with the chatter amplitude was well. Finally back propagation(BP) neural network have been applied to the pattern recognition for the classification of chatter signal in various cutting conditions. The validity of this systed was confirmed by the experiments under the various cutting conditions.

  • PDF

Dynamic Filtering of End-milling Force Using Wavelet Filter Bank (웨이블렛 필터뱅크를 이용한 동적 엔드밀 절삭력 필터링)

  • Cho, Hee-Geun;Chin, Do-Hun;Yoon, Moon-Chul
    • Journal of the Korean Society of Manufacturing Technology Engineers
    • /
    • v.18 no.4
    • /
    • pp.381-387
    • /
    • 2009
  • The end-milling force behaviour is very complex and it is related to a de-noising phenomenon, so it is very difficult to detect and diagnose this static cutting force phenomenon. This paper presents a new method of filtering of end-milling force in end-milling operation using filter bank technique, based on the wavelet transform. In this paper by comparing the history of end-milling force using wavelet filtering the fundamental end-milling property of the wavelet transform is well reviewed and analyzed. This result of wavelet transform using filter bank shows the possible static prediction of end-milling force with severe dynamic properties such as chatter in end-milling operation.

  • PDF

A Study on the Metrial Charcterisitics of Material Quality and Milling of Axle Materials for a Automobile (자동차 차축 소재의 금속적 특징 및 밀링 절삭 특성 연구)

  • 채왕석
    • Journal of the Korean Society of Manufacturing Technology Engineers
    • /
    • v.6 no.1
    • /
    • pp.77-83
    • /
    • 1997
  • In this paper, we have studied internal quality including chemical compositions, microscopic structure and nonmetalic inclusion of test materials. We have analyzed dynamic characteristics of cutting force of milling including tensile strength value, hardness etc. Test materials are used in the tempered carbon steel and the non-tempered carbon steel. The obtained results are as follows: 1. In analyzing internal quality, the tempered carbon steel have typical martensite structure and the non-tempered carbon steel have ferrite + pearlite structure. 2. Yield strength, tensile strength and hardness value are in the non-tempered carbon steel but elongation is maximum value in the tempered carbon steel. 3. Cutting force is smaller non-tempered carbon steel than tempered carbon steel when feed speed and depth on cut is constant. 4. Cutting force is smaller non-tempered carbon steel than tempered carbon steel when cutting speed and depth of cut is constant.

  • PDF

A Study on the Machining Characteristics by the Internal Quality of Heat Resisting Steel (내열강의 내부품질에 따른 절삭가공 특성에 관한 연구)

  • 채왕석
    • Journal of the Korean Society of Manufacturing Technology Engineers
    • /
    • v.9 no.1
    • /
    • pp.24-29
    • /
    • 2000
  • This paper is experimental study of machining characteristics about martensitic heat resisting steel STR11. Machining characteristics are different according to internal quality(chemical compositions, microscopic structure and nonmetallic inclusion) mechanical properties(tensile strength value impact value and hardness) and dynamic cutting force. Following are the results : 1. In analyzing internal quality test materials have typical martensite structure and a minute needle-shaped structure. 2. Tensile strength and reduction of area and hardness are larger. But values of elongation and impact values are smaller. Fracture surface of tensile specimen is ductile. 3, Cutting force is decreasing with cutting speed increasing 4. Cutting force is increasing with feed speed increasing.

  • PDF

A Study on the Machining Charcterisitics of Milling of cylinderical Rod Materials for Passenger Car (승용차용 CYLINDER ROD 소재의 밀링 적삭 특성 연구)

  • 채왕석
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
    • /
    • 1996.03a
    • /
    • pp.143-148
    • /
    • 1996
  • In this paper, we have studied internal quality including chemical compositions, microscopic structure and nonmetalic inclusion of test materials. We have analyzed dynamic characteristics of cutting force of milling including tensile strength value hardness etcs. Test materials are used the tempered carbon steel and the non-tempered carbon steel. The obtained results are as follows: 1.In analyzing internal quality, the tempered carbon steel have typical martensite structure and the non-tempered carbon steel have ferrite+pearlite structure. 2.Yield strength, tensile strength and hardness value are in the non-tempered carbon steel but elongation is maximum value in the tempered carbon steel. 3.Cutting force is smaller non-tempered carbon steel than tempered carbon steel when feed speed and depth of cut is constant. 4.Cutting force is smaller to the tempered carbon steel and smaller non-tempered carbon steel than tempered carbon steel when cutting conditions

  • PDF

A Study on the Detection of Cutter Runout Magnitude in Milling (밀링가공에서의 커더 런 아웃량 검출에 관한 연구)

  • Hwang, J.;Chung, E. S.;Lee, K. Y.;Shin, S. C.;Nam-Gung, S.
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 1995.10a
    • /
    • pp.151-156
    • /
    • 1995
  • This paper presents a methodology for real-time detecting and identifying the runout geometry of an end mill. Cutter runout is a common but undesirable phenomenon in multi-tooth machining such as end-milling process because it introduces variable chip loading to insert which results in a accelerated tool wear,amplification of force variation and hence enlargement vibration amplitude. Form understanding of chip load change kinematics, the analytical sutting force model was formulated as the angular domain convolution of three dynamic cutting force component functions. By virtue of the convolution integration property, the frequency domain expression of the total cutting forces can be given as the algebraic multiplication of the Fourier transforms of the local cutting forces and the chip width density of the cutter. Experimental study are presented to validata the analytical model. This study provides the in-process monitoring and compensation of dynamic cutter runout to improve machining tolerance tolerance and surface quality for industriql application.

  • PDF

Tool Fracture Detection in Milling Process (II) -Part 2: Tool Fracture Detection in Rough Milling Using Spindle Motor Current- (밀링 공정시 공구 파손 검출 (II) -제 2 편: 주축모터 전류를 이용한 밀링의 황삭 가공 중 공구파손 검출-)

  • 김기대;이강희;주종남
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.15 no.5
    • /
    • pp.110-119
    • /
    • 1998
  • Dynamic cutting force variations in milling process were measured indirectly using spindle motor current. Magnitude of the spindle motor current is independent of cutting direction. Quasi-static sensitivity of the spindle motor current is higher than that of the feed motor current. Dynamic sensitivity of the spindle motor current is lower but cutting force was correctly represented by spindle RMS current in rough milling. In rough milling, chipping and tool fracture were well detected by the proposed tool fracture index using spindle motor current.

  • PDF

On-line Cutting Force Estimation by N[ensuring Spindle Displacement in High-Speed Milling Process (고속 밀링 가공 시 주축 변위 측정을 통한 절삭력의 실시간 감시)

  • Kim J.H.;Kim J.H.;Kim I.H.;Ahn H.J.;Jang D.Y.;Han D.C.
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2006.05a
    • /
    • pp.133-134
    • /
    • 2006
  • A cylindrical capacitive displacement sensor (CCS) was developed and applied for monitoring end milling processes. Dynamic characteristics of a spindle-assembly were measured using the CCS and a designed magnetic exciter. The technique to extract the spindle displacement component caused only by cutting from the measured signals using the CCS was proposed in the paper. Using CCS signals and FRF (Frequency Response Function) derived from dynamics of the spindle tool system, dynamic cutting forces are estimated quantitatively.

  • PDF