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고주파열처리에 의한 SM45C경도가 가공 표면 품위에 미치는 영향에 관한 연구
김원일,허성중 ( W . I . Kim,S . J . Heo ) 한국열처리공학회 1993 열처리공학회지 Vol.6 No.1
In this paper, the surface roughness influenced by Sm45C hardness in high frequency induction hardening and mechanical characteristics for the changed Hv 598 part and the unchanged hardness Hv 223 part by use of cermet and ceramic cutting tools was experimentally examined. Finally, we could be had some important results by processing surface roughness on cutting conditions such as cutting speed, feed rate, depth of cut and changes of tool nose radius. The results are summarized as follows. 1. In case of the same cutting condition, the hardness of workpiece was high and acquired the best processing surface roughness when the radius of the tool nose had 0.8㎜ and feed rate was 0.04㎜/rev. 2. In case of the hardness of workpiece, though the cutting speed didn`t have an effect on processing surface roughness, the less feed rate and the more processing surface roughness improved. On the other hand, the low inside the hardness of workpiece, the more cutting speed and the more feed rate increase, the processing surface of roughness improved. 3. Regardless of the hardness of workpiece, the change of the cutting depth didn`t have great effect on the surface roughness. 4. On cutting the high surface hardness part with cutting tools of cermet and ceramic, it can be acquired the higher processing surface roughness because it hadn`t been taken effect on cutting speed. In case of the cutting process of the low inside hardness part the two cutting tools have acquired the similar processing surface roughness.
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김원일 한국불어불문학회 1986 佛語佛文學硏究 Vol.21 No.1
La vie de Baudelaire e´tait la continuite´ du malheur. Il a soufFert continuellement de sa solitude, de sa pauvrete´ et de sa maladie. Afin de s'e´chapper de la vie quotidienne pareille a` l'enfer, il a chante´ ses aspirations dans la cre´ation poe´tique et il s'est efforce´ de chercher l'harmonie, la purete´ et son salut. Le salut qu'il a cherche´ dans la cre´ation poe´tique n'e´tait pas l'amour que les chre´tiens cherchent, ni la ve´rite´ supre^me que les mystiques indiens cherchent, c'e´tait seulement la beaute´. La beaute´ lui ouvre l'univers inconnu et Cet univers inconnu est le monde du salut ou` il peut se reposer. Comme c ¿a, la beaute´ est indispensable a` Baudelaire. C'est pourquoi cet e´tude a donne´ la poursuite aux phe´nome`nes de l'esthe´tique qui paraissent dans l'oeuvre de Baudelaire. Les phe´nome`nes de son esthe´tique sont: ①le monde de la fantaisie, du mysticisme et de la re^verie ②la monde de l'artificiel ③le monde de la correspondence ④dandysme ⑤l'esthe´tique de la laideur, le satanisme, l'etrangete´ ⑥l'esthetique de l'opposition ⑦l'esthe´tique du bercement, de la paresse et du loisir ⑧l'esthe´tique de la courbe. Et afin d'atteindre son esthe´tique, il utilise les moyens que voici: ①l'imagination ②la magie ③la nature (le parfum, le brouillard, le feu, la lumie`re, le soleil, l'eau, la mer, etc.).
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초음파 진동연삭에 의한 알루미나 세라믹스의 가공성능에 관한 연구
김원일 慶南大學校 附設 工業技術硏究所 1997 硏究論文集 Vol.15 No.1
생산제품의 경량화와 고기능화를 요구하는 현대에 개발된 파인세라믹스는 기계적, 화학적 성질이 뛰어나 넓은 분야에서 활용되고 있다. 고경도, 경취성 재료인 파인 세라믹스를 고능률적인 기계가 공을 위하여 특수장치를 설계, 제작해서 밀링머신에 부착하고 연삭깊이, Table speed, 숫돌입도를 변화시키면서 초음파 연삭 및 상용 연삭한 결과, 접선저항 연삭값보다 저항값이 더 크고, 초음파 연삭보다 상용 연삭에서 연삭 저항값이 더 크게 나타났으며, 숫돌입도가 높을수록 연삭가공의 효과가 증대됨을 알 수 있었다. The ultrasonic grinding is operated by the milling machine which is attend special device for the high efficiency mechanical machining of the alumina ceramics being wear resistance and brittle material, and the following effect are obtained. 1. In casing grinding of the alumina ceramics, the value of normal force is as about three times as that of shear force at both the ultrasonic grinding and the conventional grinding. 2. The ultrasonic grinding is high efficiency machining as the plowing is decresed by smoothing chip and the grinding force is lower about three times that of the conventional grinding because of the lower grinding heat. 3. It is depth of cut that is important effect because the difference of the grinding force is larger in changing of the depth of cut than in changing of the table speed. 4. It is appeared that is obtained as incresing grain size of diamond wheel.
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