发明名称 |
Steel-tooth bit with improved toughness |
摘要 |
An earth boring bit is shown having a bit body and at least one cutter rotatably secured to the bit body. The cutter has a plurality of teeth formed integrally thereon and arranged in circumferential rows. Each of the teeth includes an outer end, an inner end, a pair of flanks and a crest which transversely connects the ends and flanks. During the manufacturing process, a temporary protective coating is applied at a region of the tooth root which comprises a sharp corner at the intersection of the flanks and ends in order to prevent a carburized case from forming in that region during subsequent carburization of the cutter. The cutter is then carburized, heat treated and mounted on a bit body.
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申请公布号 |
US6374704(B1) |
申请公布日期 |
2002.04.23 |
申请号 |
US19960638245 |
申请日期 |
1996.04.26 |
申请人 |
BAKER HUGHES INCORPORATED |
发明人 |
SCOTT DANNY EUGENE;OVERSTREET JAMES LESLIE;ZAHRADNIK ANTON F. |
分类号 |
B23K9/04;B23K35/32;B23P15/28;C21D1/72;C21D9/22;C23C8/04;C23C30/00;(IPC1-7):B21K5/02 |
主分类号 |
B23K9/04 |
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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