专利名称：Method of manufacturing seamless pipes发明人：Tomio Yamakawa,Kazuhiro Shimoda申请号：US12453568申请日：20090515公开号：US07739892B2公开日：20100622
专利附图：
摘要：Seamless pipes excellent in quality features with high productivity is made by aby carrying out piercing-rolling using a piercer provided with a pair of inclined rolls. Thepiercing-rolling is carried out under conditions such that the plug tip draft (TDFT) or theroot of the product of the plug tip draft (TDFT) are controlled along with the number of
billet revolutions (N), namely (TDFT×N). In addition, positions of the inclined rolls arecontrolled in connection with the gorge draft (GDFT) indicating the ratio of the roll gap(Rg) which is minimal in the gorge section between the inclined rolls to the billet outsidediameter (Bd). The piercing-rolling is carried out using a plug having a particular shape.
申请人：Tomio Yamakawa,Kazuhiro Shimoda
地址：Kawanishi JP,Nishinomiya JP
国籍：JP,JP
代理机构：Clark & Brody
更多信息请下载全文后查看
因篇幅问题不能全部显示，请点此查看更多更全内容