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절삭력 예측을 이용한 마이크로 엔드밀링의 이송속도 스케줄링
이한울(H.U.Lee),조동우(D.W.Cho),박종권(J.K.Park) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
In order to fabricate the micro product with high productivity using the micro-end-milling process, the optimal cutting conditions have to be determined. For this object, the cutting process simulation which is consisted of the cutting force model for micro-end-milling and the feedrate scheduling model was developed in this study. The feedrate scheduling regulates the cutting force at the level of reference cutting force by dividing the NC code blocks and controlling the feedrate in each block. The actual behavior is also considered in the feedrate scheduling process. Relevant validation is performed through the scheduling result of micro-pocket-milling. After feedrate scheduling, safer and more productive micro-end-milling operation was achieved.
가공 시스템의 실제 움직임을 고려한 마이크로 엔드밀링의 절삭 공정 시뮬레이션
이한울(H.U.Lee),조동우(D.W.Cho),박종권(J.K.Park) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
The ability to generate an optimum process plan automatically can be helpful when applying micro-end-milling to micro product fabrication. It is thus indispensable to develop a system that is capable of realistically predicting the actual cutting forces of micro-end-milling because this simulation system is main part of the optimal process planner. In micro-end-milling, because of short moving distance, there is a serious difference between an actual behavior of a machine tool and an ideal behavior commanded by NC code. To accurately predict the cutting force in micro-end-milling, the cutting configurations have to be computed from the actual machine tool behavior. In this paper, the cutting forces in micro-end-milling were predicted using the cutting configurations acquired from the actual machine tool behavior. Experimental results showed that the developed cutting process simulation system was accurately predict the cutting forces in micro-end-milling operated by NC code.
절삭조건에 독립적인 절삭력 계수를 이용한 마이크로 엔드밀링의 절삭력 예측
이한울(H.U. Lee),조동우(D.W. Cho),박종권(J.K. Park) 한국생산제조학회 2005 한국공작기계학회 추계학술대회논문집 Vol.2005 No.-
To fabricate the complex three-dimensional miniature components, micro end milling that can make a high aspect ratio part with good accuracy is being actively researched. This paper presents the mechanistic cutting force model that can precisely predict cutting forces in micro end milling in general machining situations. The model uses instantaneous cutting force coefficients that are independent of cutting conditions of end milling and reflect the most of cutting mechanism of micro end milling including the minimum chip thickness effect. Comparison between the predicted and measured cutting forces showed that the proposed approximate method gives quite accurate results.
소형 공작기계의 이송계 시뮬레이션을 이용한 마이크로 엔드밀링의 절삭 공정 시뮬레이션
이한울(H.U.Lee),정영훈(Y.H.Jeong),조동우(D.W.Cho),박종권(J.K.Park) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
In order to predict the cutting forces in general micro-end-milling operated by NC code, a cutting process simulation model was conducted. This model computes the cutting configurations using a geometric simulation based on ME Z-map and predict the cutting force using a mechanistic cutting force model that can precisely predict the cutting force in micro-end-milling under various cutting conditions. In order to eliminate a serious difference between an actual machine tool behavior and an ideal behavior commanded by NC code, a feed drive simulation was introduced. The comparison of the predicted and measured cutting forces in micro-packet-milling showed that the proposed method provides very accurate results.
인덱서블 엔드밀링 공정을 위한 향상된 절삭력 모델의 개발
김성준(S. J. Kim),이한울(H. U. Lee),조동우(D. W. Cho) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
Indexable end mills, which consist of inserts and cutter body, have been widely used in roughing of parts in the mold industry. The geometry and distribution of inserts on cutter body are determined by application. This paper proposes analytical cutting force model for indexable flat end-milling process. Developed cutting force model uses the cuttingcondition-independent cutting force coefficients and considers runout, cutter deflection and size effect for the accurate cutting force prediction. Unlike solid type endmill, the tool geometry of indexable endmill is variable according to the axial position due to the geometry and distribution of inserts on the cutter body. Thus, adaptive algorithm that calculates tool geometry data at arbitrary axial position was developed. Then number of flute, angular position of flute, and uncutchip thickness are calculated. Finally, presented model was validated through some experiments with aluminum workpiece.