公开(公告)号：EP1992437A1

公开(公告)日：2008-11-19

申请号：EP07715142.1

申请日：2007-02-23

申请人： National University Corporation Tokyo University of Agriculture and Technology

发明人： NISHIWAKI, Nobuhiko ,  HORI, Sankei

IPC分类号： B23B51/00

CPC分类号： B23B51/02 ,  B23B2251/14 ,  B23B2251/18 ,  B23B2251/282 ,  B23B2251/70 ,  Y10T408/9097

摘要： The present invention provides a drill for making a dilled hole having a high circularity. The axial asymmetric edge drill has a chisel portion formed in the tip center so that the chisel portion center matches with the drill shaft center. At least one of the cutting edges is in an axial asymmetric position with another cutting edge across the drill shaft center. The outline of the edges of the drill forms a circular arc.

摘要翻译： 本发明提供了一种用于制造具有高圆度的镗孔的钻头。 轴向不对称刃钻具有形成在尖端中心的凿形部分，使得凿形部分的中心与钻轴中心匹配。 至少一个切削刃处于轴向非对称位置，其中另一切削刃越过钻轴中心。 钻头边缘的轮廓形成一个圆弧。