简介:The4-hicoldmillisoneofthekeywidestriptandemcoldrollingmillsandhasmanyadvantagesandcharacteristics.Themilltypeisthemostimportant,fundamentalandlong-termeffectivefactorforthestripshapecontrol.ManyadvancedmilltypessuchasCVC-4,HCWandPC-4,etcarecreatedbasedontheconventionalfour-rollmill.Thefactorsofmilltypewhichaffectthedeformationofrollsystem,suchasstripwidth,rollingforce,bendingforce,workrolldiameter,backupdiameterandsoon,arestudiedhowtoaffectrollgapcrown.Itprovidesagoodfoundationforimprovingtheshapeperformanceofmill.
简介:AbriefhistoricalintroductionofresearchesonperspectiveinancientChinaispresented,thispaperstudiedanddiscussedtheperspectivetheoryorZongBing(宗炳)inthe5^thcenturyofChina,includingZongBingandthisAnintroductiontoLandscapePainting,anditsmathematicalbasis,drawingideasofZongBingaswell.