• Title/Summary/Keyword: 엔드밀링 시스템

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The Shear and Friction characteristics Analysis of Inconel 718 End-millingIusing Equivalent Oblique Cutting System -Up endmilling- (등가경사절삭 시스템에 의한 Inconel 718 앤드밀링 공정의 전단 및 마찰특성 해석I -상향 엔드밀링-)

  • 이영문;최원식;송태성
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.887-890
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    • 2001
  • In end milling process the underformed chip thickness and the cutting force components very periodically with phase change of the tool. In this study, up end milling process is transformed to the equivalent oblique cutting. The varying underformed chip thickness and the cutting force components in end milling process are replaced with the equivalent average ones. Then it can be possible to analyze the chip-tool friction and shear process in the shear plane of the end milling process by the equivalent oblique cutting mode. According to this analysis, when cutting Inconel 718.61% of the total energy is consumed in the shear process and the balance is consumed in the friction process.

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Mode analysis of end-milling process by RLSM (RLSM 모델링에 의한 엔드밀링 시스템의 모드 분석)

  • Kim, J.D.;Yoon, M.C.;Kim, K.H.
    • Journal of Power System Engineering
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    • v.15 no.5
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    • pp.54-60
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    • 2011
  • In this study, an analytical realization of end-milling system was introduced using recursive parametric modeling analysis. Also, the numerical mode analysis of end-milling system with different conditions was performed systematically. In this regard, a recursive least square(RLS) modeling algorithm and the natural mode for real part and imaginary one was discussed. This recursive approach (RLSM) can be adopted for the on-line system identification and monitoring of an end-milling for this purpose. After experimental practice of the end-milling, the end-milling force was obtained and it was used for the calculation of FRF(Frequency response function) and mode analysis. Also the FRF was analysed for the prediction of a end-milling system using recursive algorithm.

A study on the simulation for chatter vibration stability improvement of end milling process (엔드밀링 채터 안정성 개선을 위한 시뮬레이션)

  • Hwang, Joon;Lee, Won-Kuk
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.26 no.1
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    • pp.35-40
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    • 2016
  • End milling process is one of the broadly used manufacturing process for precision machined parts and products. Machining performance is often limited by chatter vibration at the tool-workpiece interface. Chatter vibration is a type of machining self-excited vibration which originated from the variation in cutting forces and the flexibility of the machine tool structure. Even though lots of cutting tooling methods are developed and used in machining process, precise analysis of cutting tooling effect in view of chatter vibration behavior. This study presents numerical and experimental approaches to verify and effects of various cutting parameters to affect to chatter vibration stability. Acquired knowledge from this study will apply the optimal cutting conditions to improve a machining process.

A Pole-Assignment ACC System in the Peripheral End Milling Process (엔드밀링 공정에서 극점배치 구속적응제어 시스템)

  • Chung, Sung-Chong
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.5 no.2
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    • pp.63-72
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    • 1996
  • In order to regulate the cutting force at a desired level during peripheral end milling processes a feedrate override Adaptive Control Constraint (ACC) system was developed. The feedrate override function was accomplished through a development of programmable machine controller (PMC) interface technique on the NC controller, Nonlinear model of the cutting process was linearized as an adaptive model with a time varying process parameter. An integral type estimator was introduced for on-line estimation of the cutting process parameter, Zero order hold digital control methodology which uses pole-assignment concept for tuning of PI controllers was applied for the ACC system. Performance of the ACC system wsa confirmed on the vertical machining center equipped with fanuc OMC through a large amount of experiment.

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The Shear and Friction Characteristics Analysis of Inconel 718 during End-milling process using Equivalent Oblique Cutting System I -Up Endmilling- (등가경사절삭 시스템에 의한 Inconel 718 엔드밀링 공정의 전단 및 마찰특성 해석 I -상향 엔드밀링-)

  • Lee, Young-Moon;Yang, Seung-Han;Choi, Won-Sik;Song, Tae-Seong;Gwon, O-Jin;Choe, Yong-Hwan
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.2
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    • pp.79-86
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    • 2002
  • In end milling process the undeformed chip thickness and the cutting force components vary periodically with phase change of the tool. In this study, up end milling process is transformed to the equivalent oblique cutting. The varying undeformed chip thickness and the cutting force components in end milling process are replaced with the equivalent average ones. Then it can be possible to analyze the chip-tool friction and shear process in the shear plane of the end milling process by the equivalent oblique cutting system. According to this analysis, when cutting Inconel 718, 61, 64 and 55% of the total energy is consumed in the shear process with the helix angle 30$^{\circ}$, 40$^{\circ}$ and 50$^{\circ}$ respectively, and the balance is consumed in the friction process. With the helix angle of 40$^{\circ}$ the specific cutting energy consumed is smaller than with the helix angle 30$^{\circ}$ and 50$^{\circ}$.

Fast Force Algorithm of End Milling Processes and Its Application to the NC Verification System (엔드밀링의 효과적인 절삭력 모델과 NC 검증시스템으로의 응용)

  • 김찬봉;양민양
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.19 no.7
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    • pp.1555-1562
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    • 1995
  • This study represents the non-dimensional cutting force model. With the non-dimensional cutting force model it is possible to estimate efficiently the maximum cutting force during one revolution of cutter. Using the non-dimensional cutting force model, the feed rate and spindle speed are adjusted so as to satisfy the maximum cutting force and maximum machining error. To verify the accuracy and efficiency of the non-dimensional cutting force model, a series of experiments were conducted, and experimental results proved and verified the non-dimensional cutting force model. The NC toolpath verification system developed in this paper uses the non-dimensional cutting force model, so that it is effective for calculating the cutting force and adjusting the cutting conditions.

Mode analysis of end-milling process by recursive parametric modelling (순환 파라메트릭 모델링에 의한 엔드밀 시스템의 모드 분석)

  • Kim, T.H.;Kim, J.D.
    • Journal of the Korean Society of Mechanical Technology
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    • v.13 no.3
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    • pp.73-79
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    • 2011
  • In this study, an analytical realization of end-milling system was introduced using recursive parametric modeling analysis. Also, the numerical mode analysis of end-milling system with different conditions was performed systematically. In this regard, a recursive least square modelling algorithm and the natural mode for real part and imaginary one was discussed. This recursive approach (RLSM) can be adopted for on-line end-milling identification. After experimental practice of the end-milling, the end-milling force was obtained and it was used for the calculation of FRF (Frequency response function) and mode analysis. Also the FRF was analysed for the prediction of a end-milling system using recursive algorithm.

Development of a Virtual Machining System by a CAD Model Based Cutting Simulation (CAD 모델에 기초한 모사절삭을 통한 가상절삭 시스템 개발)

  • 배대위;고태조;김희술
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.8 no.3
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    • pp.83-91
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    • 1999
  • In this paper, we suggest a virtual machining system that can simulate cutting forces of ball end milling at the stage of part design. Cutting forces, here, are estimated from the machanistic model that uses the concept of specific cutting farce coefficient. To this end, we need undeformed chip thickness which is used for calculating chip load. It is derived from the Z-map data of a CAD model. That is, chip load is the height difference between the cutting tool and the workpiece at an arbitrary position. The tool contact point is referred from the cutter location data. On the other hand, the workpiece height is acquired from the Z-map model of a CAD data. From the experimental verification, we can simulate machining process effectively to the slot and the side cutting of ball end mill.

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Cutting performance of Cr-Al-Si-N micro end-mill tool deposited by a hybrid coatings (하이브리드 코팅에 의한 Cr-Al-Si-N 마이크로 엔드밀공구의 가공성능)

  • Gang, Myeong-Chang;Sin, Seok-Hun;Kim, Min-Uk;Tak, Hyeon-Seok;Kim, Gwang-Ho;Kim, Jeong-Seok
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2009.05a
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    • pp.211-211
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    • 2009
  • 높은 이온화율과 복잡한 형상의 모재에도 표면 도포성 및 균일성을 나타내는 아크이온플래이팅 기술과 비전도성 세라믹 타겟물질에 적용가능한 스퍼터링 기술이 결합된 하이브리드 코팅 시스템(Hybrid coating system)을 이용하였다. 그리고 Cr-Al-N과 Cr-Si-N 코팅막의 강화 기구를 복합시킨 새로운 개념의 Cr-Al-Si-N 코팅막을 초경(WC-Co)시험편에 증착하여 Si 첨가량에 따른 미세구조의 미세경도 특성을 파악하였다. 공구성능 평가는 고속가공조건하에 마이크로 밀링기에서 무코팅(초경공구), Cr-Al-Si-N (Si : 0, 4.5, 8.7, 16 at.%) 코팅 마이크로엔드밀에 대하여 공구마멸에 대한 공구수명을 비교, 평가하였다.

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On-line Tool Deflection Compensation System for Precision End-milling (정밀 엔드밀링을 위한 실시간 공구처짐 보정시스템)

  • Yang, Min-Yang;Choe, Jong-Geun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.21 no.2
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    • pp.189-198
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    • 1997
  • This paper presents development of a practical tool deflection compensation system in order to reduce the machining error from the tool deflection compensation system in order to reduce the machining error from the tool deflection in the end-milling process. The devised system is a tool adapter which includes 1-axes force sensor for detecting tool deflection and 2-axes tool tilting device for adjusting tool position through computer interface on line process. Experimental in investigations for typical shaped workpieces representing various end milling situations are performed to verify the ability of the system to suppress the surface errors due to tool deflections. With the system, it is possible to get precise machining surface without any excessive machining error due to increased cutting force in more productive machining conditions.