发明名称 |
Walzgeschmiedeter Bohrer |
摘要 |
A roll-forged drill bit 1 comprising a shank 3 for insertion in a chuck of a drill, the shank 3 including an helically twisted web 7 defining a cutting tip 9, the cutting tip 9 including a central chisel edge 11 and a cutting edge 15 defining the maximum diameter of the cutting tip 9, wherein the cutting tip 9 is formed after the shank 3 has been roll-forged and includes a pair of faces 13 defining the chisel edge 11 and a pair of upturned flats 17 defining the cutting edge 15. A roll-forged drill bit 1 according to the present invention provides a significant improvement in cutting speed over known prior art roll-forged drill bits. <IMAGE> |
申请公布号 |
DE69630344(T2) |
申请公布日期 |
2004.05.13 |
申请号 |
DE1996630344T |
申请日期 |
1996.07.22 |
申请人 |
BLACK & DECKER INC., NEWARK |
发明人 |
MULROY, MICHAEL;JUNGWIRTH, RUDOLF;RIEDL, JOHANN |
分类号 |
B23B51/02;(IPC1-7):B23B51/02 |
主分类号 |
B23B51/02 |
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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