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.

公开(公告)号：US20210291282A1

公开(公告)日：2021-09-23

申请号：US16980981

申请日：2019-10-15

申请人： SUMITOMO ELECTRIC HARDMETAL CORP.

发明人： Masaaki JINDAI ,  Yuki TSUTSUMI

IPC分类号： B23B51/02

摘要： The drill is rotatable about a central axis. The drill includes a central axis, a front end and a rear end opposite to each other in a direction along the central axis, an outer peripheral surface, a cutting edge formed at the front end and extending from the outer peripheral surface toward the central axis, a flank face contiguous with the cutting edge, a flute formed on the outer peripheral surface and extending spirally around the central axis from the front end toward the rear end, and a thinning rake face contiguous with the flute. The cutting edge has a main cutting edge extending from the outer peripheral surface and a thinning cutting edge contiguous with an end of the main cutting edge away from the outer peripheral surface. The flute includes a main rake face contiguous with the main cutting edge from the opposite side of the flank face.

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.