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압출 성형에 의한 이방성 Sr - 페라이트 본드 자석의 자기적 특성
박범식(B. S. Park),김윤배(Yoon B. Kim),정원용(W. Y. Jeung) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.5
In this study magnetic properties of anisotropic ferrite bonded magnets produced by extrusion molding with a variety of magnetic field, extrusion mold temperature and extrusion rate were investigated. X-ray diffraction study showed the alignment of magnetic powder was decreased by molten flow in extrusion mold. When the temperature of extrusion mold was 20 ℃, the degree of alignment as much as 82 % could be achieved under the applied magnetic field of 4 kOe. The bonded magnets having the remanence of 2.2 kG was able to fabricated by extrusion molding when the packing density of Sr-ferrite powder was 50 vol %.
주만식,박범식,김민주,이승수,전언찬 동아대학교 교육대학원 2000 동아교육논총 Vol.26 No.-
This study for the perpendicularity of machining center is classified the way that measures the perpendicularity by remodeling the existing measuring device. This kind of study is studied by pack hei jae team in Weoul university and by TSUTSUMI. Especially TSUTSUMI measures the roundness according to circular compensation after the insertion of developed measuring device using a rotary encoder to the spindle of machining tool. We study how regulation velocity occuring with circular motion of machining center table influences the perpendicularity after measuring the perpendicularity using Circular Test method by a 2 dimention probe and a square in this experiment.
김민주,주만식,박범식,장성화,전언찬 동아대학교 생산기술연구소 1999 生産技術硏究所硏究論文集 Vol.4 No.2
Manufactured goods, is a complicated form, little capacity and many kind , usually is cut by a simple tool which has high work efficiency. The tool for cutting work is generally necessary for 3~4 times higher hardness than normal cutting material but a tool for cutting a cemented carbide doesn't exist except a diamond or CBN tool. Especially, a diamond tool has a specific property that wearing resistance is decreased by high-temperature carbonization and the price of diamond or CBN tool is so expensive that to find the cutting condition for cutting a cemented carbide is very important. The most hydraulic valve, multi-stage hole work , require the exact circularity and surface roughness in honing. The movement to make a importing tool in Korea is getting up due to the high cost.