发明授权
- 专利标题: Bit leg outer surface hardfacing on earth-boring bit
- 专利标题(中): 位腿外表面硬化地面钻孔
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申请号: US11709439申请日: 2007-02-22
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公开(公告)号: US07484577B2公开(公告)日: 2009-02-03
- 发明人: James L. Overstreet , Robert J. Buske , John F. Bradford, III , Caleb A. Rickabaugh
- 申请人: James L. Overstreet , Robert J. Buske , John F. Bradford, III , Caleb A. Rickabaugh
- 申请人地址: US TX Houston
- 专利权人: Baker Hughes Incorporated
- 当前专利权人: Baker Hughes Incorporated
- 当前专利权人地址: US TX Houston
- 代理机构: Bracewell & Giuliani LLP
- 主分类号: E21B10/50
- IPC分类号: E21B10/50
摘要:
An earth-boring bit has bit legs having hardfacing covering the majority of the outer surface. The hardfacing may have gaps at an area surrounding the ball plug and an area around a fixture dimple. The hardfacing may be multi-layer, with the layers differing in composition. Recesses may be located at the leading and trailing edges of the supporting metal so as to provide a thicker area of hardfacing at these corners. The supporting metal of the outer surface of the bit leg may also have an upper cylindrical section and a lower tapered section. The hardfacing has a constant outer diameter but will taper in thickness in the lower tapered section. The thickness of the hardfacing may also vary in a circumferential direction with a greater thickness over at least one of the corners.
公开/授权文献
- US20070163812A1 Bit leg outer surface hardfacing on earth-boring bit 公开/授权日:2007-07-19
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