发明名称 |
UPPER-SIDE FORMED GLASS FOR HOT BORING AND PROCESS FOR PRODUCING BILLET FOR TUBE FORMATION BY HOT EXTRUSION |
摘要 |
When a hollow billet is inserted into a container, and hot expanding piercing is downwardly performed by using a plug, hot piercing is performed by using a formed glass complex comprising a ring-shaped formed glass part and a ring-shaped projecting part. The ring-shaped formed glass part assumes a disc shape having a circular opening for allowing a plug to be inserted at the center thereof. The ring-shaped projecting part is attached to the opening of the ring-shaped formed glass part, and assumes a ring shape projecting perpendicularly to the ring-shaped formed glass part. Thereby, the piercing work can be done safely, and defects can be prevented from occurring on the inner surface of the billet. |
申请公布号 |
EP2374550(A1) |
申请公布日期 |
2011.10.12 |
申请号 |
EP20090830275 |
申请日期 |
2009.10.28 |
申请人 |
SUMITOMO METAL INDUSTRIES, LTD. |
发明人 |
NISHIMORI, JUNICHI;YAMAKAWA, TOMIO;MATSUMOTO, KEISHI;MURAKAMI, HIROAKI |
分类号 |
B21C23/32;B21C23/00;B21C23/08;B21J3/00;B21J5/10 |
主分类号 |
B21C23/32 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|