发明授权
- 专利标题: Rock bit with welded bearing pins
- 专利标题(中): 岩石钻头与焊接轴承销
-
申请号: US807450申请日: 1977-06-17
-
公开(公告)号: US4127043A公开(公告)日: 1978-11-28
- 发明人: Robert F. Evans
- 申请人: Robert F. Evans
- 申请人地址: CA Newport Beach
- 专利权人: Smith International, Inc.
- 当前专利权人: Smith International, Inc.
- 当前专利权人地址: CA Newport Beach
- 主分类号: E21B10/20
- IPC分类号: E21B10/20 ; E21B9/08
摘要:
A rock bit and manufacturing method wherein journal-bearing pins which support rotatable cutters on the bit body are separately machined and heat treated, and then mounted on the bit body by electron-beam welding or a related process of energy-beam bonding.
公开/授权文献
信息查询