公开(公告)号：US20200230708A1

公开(公告)日：2020-07-23

申请号：US16647536

申请日：2018-09-18

Applicant: A.L.M.T. Corp.

Inventor： Yuma MIYAZAKI ,  Kentaro SHIRO

IPC: B23B27/16

Abstract: An outer peripheral cutting edge located on a rear side in a rotation axis direction of the inclined cutting edge, a rotation diameter of the base metal on the rear side in the rotation axis direction of the outer peripheral cutting edge is smaller than a rotation diameter of the outer peripheral cutting edge, in a cross section perpendicular to a direction in which the inclined cutting edge extends, a cutting edge ridge of the inclined cutting edge has a roundness of a radius less than or equal to 30 μm, and a maximum height difference value of the cutting edge ridge of the inclined cutting edge is less than or equal to 20 μm.

公开(公告)号：US20230321704A1

公开(公告)日：2023-10-12

申请号：US18019177

申请日：2021-08-11

Applicant: A.L.M.T. Corp. ,  Sumitomo Electric Industries, Ltd.

Inventor： Kohei KURAMOTO ,  Takuya KINOSHITA ,  Yutaka KOBAYASHI ,  Makoto YUKAWA ,  Kohichiroh KIMURA ,  Kentaro SHIRO

IPC: B21C23/08

CPC classification number: B21C23/08

Abstract: A wire drawing die 1 includes a non-diamond material, is provided with a die hole 1h, and has a reduction 1c and a bearing 1d that is positioned downstream of the reduction 1c. A reduction angle γ which is an opening angle of the die hole 1h at the reduction 1c is less than or equal to 17°, and a surface roughness Ra of the die hole 1h within ±20 μm from a specific position inside the bearing 1d in a circumferential direction of the die hole 1h that is perpendicular to a wire drawing direction is less than or equal to 0.025 μm.