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롤의 배열이 자동차용 강판의 두께편차 및 마멸에 미치는 영향
손영지,김순경,전언찬 동아대학교 생산기술연구소 2000 生産技術硏究所硏究論文集 Vol.5 No.1
Work roll wear in the cold rolling of mild steel strip is strongly affected by rolling materials, rolling conditions such as roll arrangement in the cold rolling mill and lubrication. The tests were performed to find the effects of roll arrangement in the cold rolling mill on the work roll wear under the same lubricating conditions. The obtained results are as follows : If the distance of cold rolling is about 60 km, the surface roughness of its was reduced by half(Ra 0.49μm) and Pc(peak count) also was decreased to 60 ea/cm. It is easier for CC(Continuous casting) to make a slip on rolling than IC(Ingot casting). It is due to surface mirror in which first residual product appears and iron powder included Al2O3 is sticked. Because bending degree of 4Hi-rolling mill is higher than 6Hi-rolling mill, the first surface mirror was occurred to its center-point which is loaded strongly. 6Hi-rolling mill shape-controlled by intermediate roll doesn't need the initial crown to work roll. Therefore, fatigue and wear would appear a little bit.
손영지,김순경 동의공업대학 1998 論文集 Vol.24 No.1
This paper recommends database construction for STL data and a new method of Delaunay's triangulation in order to decrease volume errors by verifying STL file errors and modifying hole errors. Each vertex for the boundary coordinates of the verified hole errors was analyzed according to the following cases: planes or slow curves, edges, apexes, and rapid curves, In each case, a different modification process was adopted. With this method, most errors resulting from the conversion into STL data. as well as many volume errors arising from error modification, were decreased.
김순경,손영지,김영호 동의공업대학 1998 論文集 Vol.24 No.1
Since the early 1980's the use of zinc-aluminum alloy-coated steel (Galvalume) for vehicular corrosion protection has increased drastically. Late 1990's model cars and electronic products built in our country will, for the most part, be entirely made of galvalume. including the roof in many cases. Car and electronic products makers, however, are not consistent in their choice of specific galvalume types or coating weights. An extensive corrosion study was initiated by a galvalume steel sheet manufacturing company to clarify the corrosion behavior ol zinc and zinc-alloy coated automotive sheet-steel in out-panel and electrical applications. Since the early 1980's the use of zinc-aluminum alloy-coated steel for vehicular corrosion protection has increased drastically. This paper tested the performance of the corrosion mechanism of a galvalume steel sheet in dropping water.