• Title/Summary/Keyword: 엔드밀 절삭력

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엔드밀 형상에 따른 절삭가공 분석과 DB 구축 및 형상설계 S/W 개발에 관한 연구

  • 한창규;고성림
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.05a
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    • pp.267-267
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    • 2004
  • 엔드밀은 산업현장에서 정밀 금형과 다이 제조 시 넓게 사용되는 절삭 공구이며 공작기계의 향상에 따라 많은 발전을 거듭해 왔다 공작기계의 고속화에 따라 공작기계의 측면에서는 강성 증가, 열변형의 억제와 동적 안정성의 개선 및 응답성 개선을 통하여 정밀도를 향상시키고 이송속도와 절삭속도의 증가를 통해 생산성을 증대시키고 있으며 공구의 측면에서는 새로운 재종 및 코팅기법의 개발을 통해 공구수명의 향상을 달성하고 있다. 또한 공구형상의 최적화를 통해 동적 안정성을 확보하고 가공 정밀도를 개선하고자 하는 다양한 시도가 이루어지고 있다.(중략)

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Machining Characteristics Detection of Endmill Milling Tool (엔드밀 밀링공구의 가공특성검출)

  • 맹민재;조성산;정준기
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.11a
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    • pp.678-682
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    • 1996
  • Acoustic emission(AE) is monitored during end milling with a sensor attached to the cutting fluid discharge nozzle. Cutting forces are also measured and compared with the AE signals to examine the reliability of the AE signals. It is demonstrated that the AE signals provide reliable informations about the cutting processes and tool states. Moreover, edge chipping and fracture of tools can be successfully detected using both the AE signals and cutting forces.

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Prediction and Experiments of Cutting Forces in End Milling (엔드밀 가공의 절삭력 예측 및 실험)

  • 이신영;임용묵
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.13 no.4
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    • pp.9-15
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    • 2004
  • A reasonable analysis of cutting force in end milling may give much advantage to improvement of productivity and cutting tool life. In order to analyze cutting force, the cutting dynamics was modelled mathematically by using chip load, cutting geometry, and the relationship between cutting forces and the chip load. The specific cutting constants of the cutting dynamics model were obtained by average cutting forces, tool diameter, cutting speed, feed, axial depth, and radial depth of cut. The model is verified through comparisons of model predicted cutting forces with measured cutting forces obtained from machining experiments. The results showed good agreement and from that we could predict reasonably the cutting forces in end milling.

Effects of Cutting Conditions on Specific Cutting Force Coefficients in End Milling (엔드밀 가공시 절삭조건이 비절삭력계수에 미치는 영향)

  • Lee Sin-Young
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.13 no.6
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    • pp.1-9
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    • 2004
  • For improvement of productivity and cutting tool lift, cutting force in end milling needs to be predicted accurately. In order to analyze cutting force, the cutting dynamics was modelled mathematically by using chip load, cutting geometry, and the relationship between cutting forces and the chip load. Specific cutting force coefficients of the cutting dynamics model were obtained by average cutting forces, tool diameter, cutting speed, fled, axial depth and radial depth of cut. The effects of the cutting conditions on the specific cutting force constants in milling were studied. The model is verified through comparisons of model predicted cutting forces with measured cutting forces obtained from machining experiments.

A Study on the Prediction of Tool Deflection and Precision Machining in Ball End Milling Process (볼 엔드밀 가공에서의 공구 처짐 예측과 정밀 가공에 관한 연구)

  • 조현덕;양민양
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.16 no.9
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    • pp.1669-1680
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    • 1992
  • This paper deals with the prediction of cutting force and tool deflection and it's application in the flexible ball end milling process. Machining accuracy is determined by the static stiffness of tool system and the instantaneous cutting force. The static stiffness of tool system consists of the stiffness of holer and the stiffness of ball end mill. The stiffness of holder was obtained from the experimental result, and the stiffness of ball end mill with two flutes was theoretically analyzed by the finite elements method. In cutting process, the instantaneous cutting force is dependent upon the instantaneous feed and pick feed(radial depth of cut) which are varied by tool deflection. For the calculation of cutting force and deflection of ball end mill, iteration method is used with the linear interpolation to the data of cutting force obtained from rigid ball end mill and the data of tool deflection. In this paper, a for enhancing accuracy is discussed. And the selection of helix angle for minimizing machining error is also discussed.

Cutting Force Prediction in End Milling of STS 304 Considering Tool Wear (STS 304 엔드밀 가공시 공구마멸을 고려한 절삭력 예측)

  • Kim, Tae-Young;Jeong, Eun-Cheol;Shin, Hyung-Gon;Oh, Sung-Hoon
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.12
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    • pp.46-53
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    • 1999
  • Cutting force characteristics is closely related with tool wear on the end milling. And it is found that the tool wear can be properly obtained by observation through the tool-maker's microscope when STS 304 is cut using an end mill. The relationship between the tool wear and the cutting force is established based on data obtained from a series of experiments. A cutting force model can be derived from basic cutting force model using parasitic force components of this tool wear. The results of th simulation using the cutting force model proposed in this paper were verified experimentally and a good agreement was partly obtained. The proposed model is capable of predicting increased cutting force due to tool wear.

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Improvement of Chip Thickness Model in 2-flutes Slot End Milling (2날 엔드밀 슬롯 가공시 칩두께 모델의 개선)

  • Lee Dong-Kyu;Lee Ki-Yong;Lee Kune-Woo;Oh Won-Zin;Kim Jeong-Suk
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.1
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    • pp.32-38
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    • 2005
  • Generally, cutting force models use a sin function method to calculate chip thickness. In slot end milling, the error from a sin function method is much bigger than other machining because a tool rotation angle in cutting is much larger. Thus in this paper, a new method to calculate chip thickness was suggested and evaluated. In a new method, tool position data according to tool rotation are checked and stored so that it is possible correct chip thickness is calculated. Cutting force waveforms simulated from a sin function method and a new method and measured waveforms from experiments were compared and error percentages were obtained. Finally, a new method had good results for simulating cutting force in slot end milling.

An Analysis of the Cutting Force for Peripheral End-milling Considering Run-out (런아웃을 고려한 측면 엔드밀 가공의 절삭력 분석)

  • Kim, Jong-Do;Yoon, Moon-Chul;Kim, Byung-Tak
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.11 no.4
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    • pp.7-12
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    • 2012
  • The cutting force for peripheral end-milling considering run-out property was estimated and its result was compared with that of measured one. An experimental coefficient modelling was used for the formulation of theoretical end-milling force by considering the specific cutting force coefficient. Also, the specific cutting force, that is the multiplication of specific cutting force coefficient and uncut chip thickness, was used for the prediction of end-milling force. The end-milling force mechanics with run-out was presented for the estimation of theoretical force in peripheral end-milling by considering the geometric shape of the workpiece part. As a result, the estimated end-milling force shows a good consistency with the measured one. And it can be used for the prediction of force history in end-milling with run-out which incurs different start and exit immersion angle in entering and exiting condition.

Representation of cutting forces and tool deflection in end milling using Fourier series (엔드밀 가공에서 푸리에 급수를 이용한 절삭력 및 공구변형 표현)

  • Ryu S.H.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.10a
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    • pp.781-785
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    • 2005
  • Cutting forces and tool deflection in end milling are represented as the closed form of tool rotational angle and cutting conditions. The discrete cutting forces caused by tool entry and exit are continued using the Fourier series expansion. Tool deflection is predicted by direct integration of the distributed loads on cutting edges. Cutting conditions, tool geometry, run-outs and the stiffness of tool clamping pan are considered for cutting forces and tool deflection estimation. Compared to numerical methods, the presented method has advantages in short prediction time and the effects of feeding and run-outs on cutting forces and tool deflection can be analyzed quantitatively. This research can be effectively used in real time machining error estimation and cutting condition selection for error minimization since the ferm accuracy is easily predicted by tool deflect ion curve.

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