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고속도강 드릴 가공에서의 플랭크 마모가 공구수명에 미치는 영향에 관한 연구
김일선 釜山工業大學校 1994 論文集 Vol.36 No.-
For tool wear sensing to predict tool life, in the drilling of steel(SM45C) using H·S·S drills of 10.4mm dia. at V=22.5m/min(690rpm), f=0.1mm/rev, the results obtained are as follows ; 1) High-speed steel drill life is found to be a strong function of the work material hardness(T??αH??) when drillin steel(SM45C). 2) It would be advisable to predetermine the tool life criteria when theaverage flank wear is reached the region where flank wear occurrs at agradually increasing rate(V??≒0.10mm). 3) Using orthogonal cutting model, equations to calculate torque(M) and thrust(T) generated during a drilling operation with gradual tool wear are obtained. M=0.125 H??·d²·f + 0.047 H??·d²·ωf + 0.3925 H??·d²·r T= 0.3214 H??·d·f + 0.0972 H??·d·ωf + 0.9158 H??·d·r
金日善 釜山工業大學校 1980 論文集 Vol.21 No.-
This paper has reached the following conclusion as the results of an experimental study on the surface resistivity characteristics of galvanic anodes for grounding cell design of corrosion protection of piping system as three kinds of zinc alloy anode aluminium alloy anode and magnesium alloy anode; 1). Surface resistivity of galvanic anode was affected less by the space of anode, but was affected more by environmental specific resistance. 2). In all environments, as the surface resistivity and resistance increase factor of magnesium alloy anode are the least value, so it is suitable for grounding cell design. But in low specific resistance, as it has self-consumption defects that the optimum design value was in the case of ?=1,000??. 3). When specific resistance is less than 1,000??/ Zinc alloy anode is good, but aluminium alloy is not in all specific resistance. 4). The empirical equation of E-R? curves regarding the empirical obtained through the polarization test with galvanic anodes were by experiments and calculations by digital computer, and the general equation type was obtained as the following;
金日善 釜山工業大學校 1983 論文集 Vol.24 No.1
The continuous Casting of Steel is rapidly expanding its scope of influence in the field of steel making, because the process is superior to the conventional ingot making process from the view point of the duct quality, working environment, and automation. The main problem of continuous casting is how to control heat transfer phenomena skillfully. There fore, this report describes the results which were Calcalated by mathematical models of the heat transfer, in each step from the tapping of steel to the transfer table as described bolow: ① The relation between the elapsed time and temperatuse of molten steel in the ladle. ② The relation between the elapsed time and temperatare of molten steel in the tundish. ③ Temperature distributions of the billet in the mold, and the secondary Cooling and air cooling zones. ④ Temper ature drop of the billet due to in-line reduction ⑤ Temperature distribution of the billet on the transfer table In. these case, calculations were performed sequentialy by algebraic equations by the use of finite difference techniques.