专利检索 ap:("Yoh Ishii" OR "Masami Abe" OR "Yuhzoh Harada" OR "Atsumi Takasugi" OR "Kazumi Kato") AND inv:"Yuhzoh Harada" 第 1 页

1.

发明授权
Method of manufacturing hollow billet and apparatus therefor 失效
标题翻译：中空钢坯的制造方法及其设备

公开(公告)号：US4875519A

公开(公告)日：1989-10-24

申请号：US185436

申请日：1988-04-25

申请人： Yoh Ishii , Masami Abe , Yuhzoh Harada , Atsumi Takasugi , Kazumi Kato

发明人： Yoh Ishii , Masami Abe , Yuhzoh Harada , Atsumi Takasugi , Kazumi Kato

IPC分类号： B22D11/00 , B22D11/04 , B22D11/041 , B22D11/049

CPC分类号： B22D11/006

摘要： A method and apparatus utilizing a core is located at a central portion of a molten metal storing portion in a vertical semi-continuous mold. The molten metal is poured into the molten metal storing portion, and casting takes place with the inner diameter of a solidified distal portion of the molten metal being controlled by a distal portion of the core. This approach provides a reliable method for the manufacture of high-quality hollow billets which are free from internal defects.