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专利权人:

Ltd.;Toko Co.

发明人:

TERASHIMA, Makoto

申请号：

EP17815477

公开号：

EP3476510A4

申请日:

2017.06.22

申请国别(地区):

EP

年份:

2020

代理人:

摘要：

A drill (1) includes a tip cutting edge (9) provided at a tip end thereof and a main cutting edge (10) continuous to a rearward of the tip cutting edge (9). A point angle of the tip cutting edge (9) is a predetermined acute angle. A point angle of the main cutting edge (10) decreases from a front end toward a rear end of the main cutting edge. A point angle at the front end of the main cutting edge (10) is an acute angle greater than the point angle of the tip cutting edge (9).

来源网站：

中国工程科技知识中心

来源网址：

http://www.ckcest.cn/home/