发明名称 |
Bit leg outer surface hardfacing on earth-boring bit |
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.
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申请公布号 |
US7484577(B2) |
申请公布日期 |
2009.02.03 |
申请号 |
US20070709439 |
申请日期 |
2007.02.22 |
申请人 |
BAKER HUGHES INCORPORATED |
发明人 |
OVERSTREET JAMES L.;BUSKE ROBERT J.;BRADFORD, III JOHN F.;RICKABAUGH CALEB A. |
分类号 |
E21B10/50 |
主分类号 |
E21B10/50 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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