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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;
25Cr-6Ni Stainless steels의 熱間加工에 미치는 Carbon과 Titanium의 效果
金日善 釜山工業大學校 1980 論文集 Vol.21 No.-
A structural investigation has been Conducted to explain variations in the hot working characteristics of 25 pct Cr-6 pct Ni Stainless Steel over a board range of temperatues. The difficulties in hot working plate products previously associated with two phase ferrite-austenite structure are shown to be related to the formation of cellular aggregate of chromium Carbide and Austenite at ferrite interfaces. These difficulties mat be avoided in two days. 1) Starting hot working at temperatures where the structure of the steel is sabstantially all ferrite. 2) Limiting the formation of the cellular aggregate of chromium carbide and austinite either by melting to carbon contents less than 0.03pct or by adding stoichiometric amount of strong. Carbide forming element such as titanium to conbine with excess carbon.