| 发明名称 |
A method of making a blank of a drill bit. |
| 摘要 |
<p>A plurality of blanks for drill bits are produced from a disc-shaped composite abrasive compact by first producing a plurality of sticks of polygonal shape end-on and thereafter longitudinally rounding each stick. The rounded drill blank is then fluted to produce a small diameter twist drill bit.</p> |
| 申请公布号 |
EP0206652(A2) |
申请公布日期 |
1986.12.30 |
| 申请号 |
EP19860304491 |
申请日期 |
1986.06.12 |
| 申请人 |
DE BEERS INDUSTRIAL DIAMOND DIVISION (PROPRIETARY) LIMITED |
发明人 |
PHAAL, CORNELIUS |
| 分类号 |
B23B;B23B51/00;B23P15/32;B24D;B24D7/18;(IPC1-7):B23P15/32 |
主分类号 |
B23B |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
