公开(公告)号：US10300534B2

公开(公告)日：2019-05-28

申请号：US15504484

申请日：2015-08-19

Applicant: SUMITOMO ELECTRIC HARDMETAL CORP.

Inventor： Yuma Kawakami ,  Daisuke Murakami ,  Masaaki Jindai ,  Keiji Kinoshita

IPC: B23B51/02 ,  B23B51/00

Abstract: Provided is a drill having a flat-shaped drill tip and excellent in cutting edge strength and chip removability. The drill includes: a cutting edge extending in a direction at an angle α of not less than 85° and not more than 90° with respect to a drill axis (line O-O); a flank face contiguous to the cutting edge and having a clearance angle β of not less than 5° and not more than 10° with respect to the drill axis (line O-O); and a rake face located opposite to the flank face across the cutting edge, the cutting edge includes a recess receding in a direction parallel to the drill axis (line O-O), and the rake face includes a front clearance formed at a side of an outer periphery of the drill.

公开(公告)号：US11446742B2

公开(公告)日：2022-09-20

申请号：US17052863

申请日：2019-03-26

Applicant: SUMITOMO ELECTRIC HARDMETAL CORP.

Inventor： Yuma Kawakami ,  Tomoyuki Fukuyama ,  Shinya Ikenaga

IPC: B23B27/16 ,  B23B27/14 ,  B23B51/00

Abstract: When seen in a direction perpendicular to a seating surface, the second boundary line has a first portion and a second portion, the first portion having an inclination relative to the second cutting edge portion in a counter clockwise direction, the first portion being located between the first boundary line and an intersection between the second boundary line and a straight line passing through a center of a mounting hole and perpendicular to the second cutting edge portion, the second portion being located opposite to the first portion relative to the intersection, the second portion having an inclination relative to the second cutting edge portion in a clockwise direction.

公开(公告)号：USD823909S1

公开(公告)日：2018-07-24

申请号：US29596415

申请日：2017-03-08

Applicant: SUMITOMO ELECTRIC HARDMETAL CORP.

Designer： Yuma Kawakami ,  Yoshiji Sato ,  Ryusei Hamada

公开(公告)号：USD814536S1

公开(公告)日：2018-04-03

申请号：US29596244

申请日：2017-03-07

Applicant: SUMITOMO ELECTRIC HARDMETAL CORP.

Designer： Yuma Kawakami

公开(公告)号：US20170232529A1

公开(公告)日：2017-08-17

申请号：US15504484

申请日：2015-08-19

Applicant: SUMITOMO ELECTRIC HARDMETAL CORP.

Inventor： Yuma Kawakami ,  Daisuke Murakami ,  Masaaki Jindai ,  Kenji Kinoshita

IPC: B23B51/02

CPC classification number: B23B51/02 ,  B23B51/00 ,  B23B2251/04 ,  B23B2251/08 ,  B23B2251/14 ,  B23B2251/18 ,  Y10T408/9097

Abstract: Provided is a drill having a flat-shaped drill tip and excellent in cutting edge strength and chip removability. The drill includes: a cutting edge extending in a direction at an angle α of not less than 85° and not more than 90° with respect to a drill axis (line O-O); a flank face contiguous to the cutting edge and having a clearance angle β of not less than 5° and not more than 10° with respect to the drill axis (line O-O); and a rake face located opposite to the flank face across the cutting edge, the cutting edge includes a recess receding in a direction parallel to the drill axis (line O-O), and the rake face includes a front clearance formed at a side of an outer periphery of the drill.