公开(公告)号：US20220288699A1

公开(公告)日：2022-09-15

申请号：US17636690

申请日：2020-05-22

申请人： SUMITOMO ELECTRIC HARDMETAL CORP.

发明人： Mayuka SEGAWA ,  Machiko ABE ,  Akihiko UEDA ,  Yoshinori TANIGAWA ,  Takashi HARADA

IPC分类号： B23B27/20 ,  B23B51/00

摘要： A drill includes a blade tip part that is formed of diamond and a trunk part that is formed of diamond and is continuous with the blade tip part, the drill rotating about a drill axis, the blade tip part includes N cutting edges where N is an integer of no less than 4, and a proportion of S1 to S2 is no less than 30% and no more than 60%, where S1 is an area of the drill in a cross-section with the drill axis as a normal line, the cross-section including a boundary between the blade tip part and the trunk part, r is a maximum value of a distance from the drill axis to an outer edge of the drill in the cross-section and S2 is an area of a circle with r as a radius.

公开(公告)号：US20220339719A1

公开(公告)日：2022-10-27

申请号：US17763431

申请日：2021-06-14

申请人： SUMITOMO ELECTRIC HARDMETAL CORP. ,  Sumitomo Electric Industries, Ltd.

发明人： Rintaro SUGIMOTO ,  Takashi HARADA ,  Satoru KUKINO ,  Taisuke HIGASHI ,  Naoki WATANOBE ,  Mayuka SEGAWA

IPC分类号： B23C5/10

摘要： A tool of the present disclosure includes a tip end portion. The tip end portion has a surface. At least a part of the surface includes a plurality of protrusions, a first recess provided by contact between ends of two adjacent protrusions of the protrusions, and a second recess different from the first recess. The second recess is provided inside at least one of the protrusions or provided to extend across the two adjacent protrusions.

公开(公告)号：US20220297201A1

公开(公告)日：2022-09-22

申请号：US17642196

申请日：2020-08-18

申请人： SUMITOMO ELECTRIC HARDMETAL CORP.

发明人： Akihiko UEDA ,  Mayuka SEGAWA ,  Rintaro SUGIMOTO ,  Machiko ABE ,  Takashi HARADA ,  Satoru KUKINO

IPC分类号： B23B27/20 ,  B23B51/00

摘要： A diamond cutting tool comprises a base metal part and a diamond part joined to the base metal part, wherein the base metal part is made of an alloy containing tungsten carbide, the diamond part configures at least a cutting blade, the cutting blade comprises a portion of a rake face, a portion of a flank face, and a ridge line at which the rake face and the flank face cross, the diamond cutting tool has a region A, the region A is a region that is present bridging over the three, which are the rake face, the ridge line, and the flank face on the surface of the cutting blade, and the region A has a surface roughness Ra of not more than 0.2 μm and a concentration of tungsten element of not more than 1 mass %.