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이영문,배대원,장준호,Lee, Young-Moon,Bae, Dae-Won,Jang, Jun-Ho 한국기계가공학회 2005 한국기계가공학회지 Vol.4 No.2
In this study, the chip breaking characteristics of S, PbS and BiS free machining steels have been assessed. PbS free machining steel shows the lowest value of chip thickness ($t_c$) under the same cutting conditions. SM10C steel has the largest value of the chip cross-section area ratio ($R_{CA}$). As the feed rate becomes larger the chip breaking cycle time ($T_B$) decreases and the chip breaking index ($C_B$) increases. The properly controlled-C type chip has been obtained with the value of $C_B$ between 0.05 and 0.2. Free machining steel, PbS produces the properly controlled-C type chip in a wider feed rate range than other steels.
이영문(Young-Moon Lee),배대원(Dae-won Bae),김선일(Sun-Il Kim),황근식(keun-sik Hwang),손성필(Sung-Pil Son),박건우(Geon-Woo Park) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-
In Ball end milling processes, characterized by use of rotating tools, the underformed chip volume varies periodically with the phase change of tool. In current study, as a new approach to analyze shear behaviors in the shear plane and chip-tool friction behaviors in the chip-tool contact region during an ball end milling process. In this approach, ball end milling process is transformed into an equivalent oblique cutting process. Experimental investigations for two sets of cutting tests i.e.. ball end milling and the equivalent oblique cutting tests were performed to verify the presented model.
이영문(Young Moon Lee),최원식(Won Sik Choi),장승일(Sung Il Chang),배대원(Dae Won Bae),손정우(Jeong Woo Son),이현구(Hyun Goo Lee) 한국생산제조학회 2005 한국생산제조학회지 Vol.14 No.4
As a new approach to analyze grinding energy, this paper introduces a specific grinding energy model based on the average grain. Using this model, grinding characteristics such as radial and tangential forces, specific grinding energy of SM45C were investigated with changing grinding variables such as workpiece velocity(v) and apparent depth of cut(Z) in down-surface grinding. From the experimental results, the specific grinding energy decreases as the maximum undeformed chip thickness increases. And there is no significant difference between the specific grinding energies of the existing and the proposed model.