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[論文] SSW2의 피삭성에 관한 연구(제1보)-표면거칠기,절삭저항의 특성 및 칩파단영역-
최만성(M. S. Choi),최대봉(D. B. Choi) 한국자동차공학회 1992 오토저널 Vol.14 No.6
The turning tests with sintered carbide tools have been conducted on typical high strength SSW2 railway wheel steel and its machinability were examined in terms of the cutting resistance. the roughness of turning surface, the chip disposal and others. Some results obtained in this paper are as follows: (1) The cutting resistance is not affected by the cutting speed (in this paper these were 23-~78 m/min). (2) The roughness of finished surface is found to be largely dependent on cutting conditions and tool geometry. (3) There exists the explicit relation between the tool geometry and the effective breaking range of chip. (4) The experimental equations which relates between cutting conditions (cutting speed, feedrate, and depth of cut) and independent variables(cutting resistance, surface roughness) are derived.
[論文] 應答表面法에 의한 切斷바이트의 工具壽命式에 關한 硏究
김원일(W.I.Kim),이윤경(Y.K.Lee),남준우(J.W.Nam),송지복(J.B.Song),최만성(M.S.Choi) 한국자동차공학회 1988 오토저널 Vol.10 No.2
This paper presents a study of tool-life equation on cut-off test by the statistical approach, refered to as response surface methodology instead of a conventional one-variable at a time method.It is the merit of response surface methodology that the test time is reduced to minimize the size and accurate analysis can be done.The reliability of such an equation can also be estimated.Two independent variables, cutting speed and feed rate, were investigated.A first order modeling equation is presented in this project.<br/> The results of this study are as follows that tool-life in cut-off operation is affected by cutting speed more than feed, and first order tool-life predicting equations are in good agreeement with experimental results.
최만성 한국기술교육대학교 1997 論文集 Vol.4 No.1
In this study, geometrical similarity conditions for drills of various diameters are discussed. The effect of geometrical similarity on the chip shape and forces of different sized conventional drills has been experimentally confirmed. Drillng tests are carried out for SM45C by using the conventional HSS drills. The torque and thrust forces are measured and compared with those chip forms. Chip shape in drilling are affected by three factors being flow angle, side and up curl of the chip. It is found that the feedrate and drill diameter are more affected than cutting speed on the chip form and cutting forces. The similarity conditions gives easily to estimate the chip shape, the thrust and the torque for drills of different diameters.
최만성 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.6
In this study, geometrical similarity conditions for drills of various diameters are discussed. The effect of geometrical similarity on the chip shape and forces of different sized conventional drills has been experimentally continued. Drilling tests are carried out for SM45C by using the conventional HSS drills. The torque and thrust forces are measured and com-pared with those chip forms. Chip shape in drilling are affected by three factors being flow angle, side and up curl of the chip. It is found that the feedrate and drill diameter are more affected than cutting speed on the chip form and cutting forces. The similarity conditions gives easily to estimate the chip shape, the thrust and the torque for drills of different diameters.
이정길,최만성 한국기술교육대학교 1998 論文集 Vol.5 No.1
Current practice for predicting tool life is entirely empirical: consequently, a prohibitive number of tests must be conducted in order to take all influential factors into consideration in predicting tool performance for a specific set of cutting conditions. One of these factors is the direction of chip flow across the tool face. This determines the effective rake angle which in turn affects the tool life. The usefulness and application of present tool life data will be greatly expanded if they can be correlated with the tool geometry in the direction of chip flow. Such a correlation, however, will be useful only if it is possible to predict the direction of chip flow for a given tool used with any combination of cutting conditions. This paper presents correlation between feeding force and chip flow angle under a given tool shape and cutting conditions, and thus establishes a necessary basis for the successful completion of the second phase of the over-all objective.