| 发明名称 |
DRILL AND DRILLING METHOD FOR WORKPIECE |
| 摘要 |
A drill includes a cutting edge. The cutting edge has a point angle which is continuously decreased from a center-position point angle A (herein, 0°<A<180°) at a center position to a maximum-diameter-position point angle of 0° at a maximum diameter position. The cutting edge has a relief angle which is continuously decreased from the center position to the maximum diameter position. The cutting edge of the drill has a relief angle at the maximum diameter position. Hence, the cutting edge also serves as a cutting edge for reaming. The ridgeline and relief face of the cutting edge have no corner, thereby providing good wear resistance. |
| 申请公布号 |
US2016023281(A1) |
申请公布日期 |
2016.01.28 |
| 申请号 |
US201514875870 |
申请日期 |
2015.10.06 |
| 申请人 |
FUJI JUKOGYO KABUSHIKI KAISHA |
发明人 |
NAKAHATA Tatsuo;SAITO Manabu;HOSOI Masanori;TAKAHASHI Hideharu |
| 分类号 |
B23B51/02 |
主分类号 |
B23B51/02 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A drill comprising:
a cutting edge, wherein the cutting edge has a point angle which is continuously decreased from a center-position point angle A at a center position to a maximum-diameter-position point angle of 0° at a maximum diameter position, wherein the cutting edge has a relief angle which is continuously decreased from the center position to the maximum diameter position, wherein the cutting edge has the radial relief angle at the maximum diameter position, and wherein the point angle A at the center position satisfies a condition 0°<A<180°. |
| 地址 |
Tokyo JP |
