公开(公告)号：US20230226619A1

公开(公告)日：2023-07-20

申请号：US17928627

申请日：2020-06-03

申请人： Sumitomo Electric Hardmetal Corp. ,  AISIN Corporation

发明人： Koji TAKAHASHI ,  Masaaki JINDAI ,  Akihiro KIHARA ,  Yusuke MATSUNO

IPC分类号： B23B51/00 ,  B23B51/06

CPC分类号： B23B51/009 ,  B23B51/068 ,  B23B2251/08 ,  B23B2251/12 ,  B23B2251/40

摘要： A drill has a first main body portion and a second main body portion. The first main body includes a chip discharging surface, a flank face, and an outer peripheral surface. A ridgeline between the chip discharging surface and the flank face constitutes a cutting edge. The chip discharging surface has an auxiliary flute surface provided in a form of a helix around a center axis, the auxiliary flute surface being contiguous to the cutting edge, the auxiliary flute surface being recessed in a direction opposite to a rotation direction of the drill. An auxiliary cutting edge portion has a first end portion and a second end portion. When viewed in a direction along the center axis, a value obtained by dividing the maximum value of the diameter of the second main body portion by the diameter of the first main body portion is 1.5 or more.

公开(公告)号：US20240165717A1

公开(公告)日：2024-05-23

申请号：US17772625

申请日：2021-03-23

申请人： Sumitomo Electric Hardmetal Corp.

发明人： Koji TAKAHASHI ,  Masaaki JINDAI

IPC分类号： B23B51/02 ,  B23B51/00

CPC分类号： B23B51/02 ,  B23B51/0004 ,  B23B2251/20 ,  B23B2251/40

摘要： A drill head is rotated about a center axis. The drill head includes: a mounting surface that is an end face in a direction of the center axis; a tip surface that is an opposite surface to the mounting surface in the direction of the center axis; an outer peripheral surface continuous to the mounting surface and the tip surface; a cutting edge extending from the outer peripheral surface toward the center axis in the tip surface; a flute that is formed on the outer peripheral surface and extends spirally around the center axis from the tip surface to the mounting surface; and a thinning surface continuous to the tip surface and the flute. The tip surface includes: a first flank surface continuous to the cutting edge; and a second flank surface located on a side opposite to the first flank surface with the flute interposed therebetween.