公开(公告)号：US20180079002A1

公开(公告)日：2018-03-22

申请号：US15560084

申请日：2016-03-18

Applicant: MITSUBISHI MATERIALS CORPORATION

Inventor： Wardoyo AKHMADI EKO ,  Toshihiko MATSUO ,  Chihiro SAKURAZAWA ,  Shotaro MATSUMOTO

IPC: B22F3/10 ,  B22F1/00 ,  C23C14/34 ,  C22C27/04

CPC classification number: B22F3/10 ,  B22F1/0011 ,  B22F3/14 ,  B22F2201/20 ,  B22F2301/20 ,  B22F2304/10 ,  B22F2998/10 ,  C22C1/045 ,  C22C27/04 ,  C23C14/3414 ,  B22F1/0003

Abstract: A polycrystalline tungsten compact, having high density and a fine grain structure is produced by: preparing a raw material powder made of W particles, a raw material powder where W powder and an alloy particle powder of one or more selected from Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and Mn are blended, or a green compact thereof; inserting them in a pressure sintering apparatus; and sintering them in a state where a pressing of 2.55-13 GPa is loaded on the raw material powders or the green compacts at 1200° C. to a melting point. A relative density of the compact is 99% or more, a porosity of the compact measured in an arbitrary cross section of the compact is 0.2 area % or less, an average crystal grain size is 50 μm or less, and an average aspect ratio of crystal grains is 1 to 2.5.

公开(公告)号：US20170328136A1

公开(公告)日：2017-11-16

申请号：US15531255

申请日：2015-11-26

Applicant: MITSUBISHI MATERIALS CORPORATION

Inventor： Wardoyo AKHMADI EKO ,  Toshihiko MATSUO ,  Chihiro SAKURAZAWA

IPC: E21B10/56 ,  E21B10/567 ,  B25D17/02

CPC classification number: E21B10/56 ,  B25D17/02 ,  E21B10/36 ,  E21B10/567 ,  E21B10/5673 ,  E21B2010/561 ,  E21B2010/566

Abstract: A drill bit button insert of the present invention that is attached to a button inserts mounted in a drill bit and performs a drilling, includes a tip body and an abrasive layer formed of a diamond sintered body harder than the tip body coated at least at the button insert working/cutting surface of the tip body, in which the abrasive layer has at least two high hardness layers and a low hardness layer having a hardness lower than that of the high hardness layer disposed between these high hardness layers from the surface side of the abrasive layer toward the tip body side.

公开(公告)号：US20170106454A1

公开(公告)日：2017-04-20

申请号：US15129300

申请日：2015-03-27

Applicant: MITSUBISHI MATERIALS CORPORATION

Inventor： Toshihiko MATSUO ,  Wardoyo AKHMADI EKO ,  Chihiro SAKURAZAWA ,  Tadakazu OHASHI

IPC: B23B51/02 ,  B23C5/10 ,  B23B51/06

Abstract: A rotary cutting tool including a polycrystalline diamond material of the invention includes: a tool body rotated about an axis with a carbide substrate made of cemented carbide and a flute provided at a tip portion thereof; a PCD layer sintered integrally with the carbide substrate, provided on an inside face of the flute facing in a rotation direction; and a cutting edge provided on the PCD layer to have the inside face as a rake face, in which a margin portion continuous with a rear side of the flute in the rotation direction is formed on an outer periphery of the tip portion, the cutting edge is formed at a ridge portion of the rake face, and a thickness of the PCD layer is 1/3 to 1 times a width of the margin portion.

公开(公告)号：US20180080285A1

公开(公告)日：2018-03-22

申请号：US15558518

申请日：2016-03-17

Applicant: MITSUBISHI MATERIALS CORPORATION

Inventor： Wardoyo AKHMADI EKO ,  Toshihiko MATSUO ,  Chihiro SAKURAZAWA

IPC: E21B10/567

CPC classification number: E21B10/5673 ,  B22F7/062 ,  B22F2005/001 ,  C22C26/00 ,  E21B10/36 ,  E21B10/46 ,  E21B10/56 ,  E21B10/567

Abstract: A drill bit insert attached to a tip portion of a drill bit to perform drilling, includes: an insert body (1) that includes: a rear end portion buried in a bit body of the drill bit; and a tip portion protruding from a surface of the drill bit and tapered toward a tip side of the insert body, in which a surface of at least the tip portion of the insert body (1) made of polycrystalline cubic boron nitride compact (4) sintered using a catalytic metal containing Al and at least one selected from the group consisting of Co, Ni, Mn, and Fe and containing 70 vol % to 95 vol % of cubic boron nitride.

公开(公告)号：US20180010395A1

公开(公告)日：2018-01-11

申请号：US15543158

申请日：2016-01-14

Applicant: MITSUBISHI MATERIALS CORPORATION

Inventor： Wardoyo AKHMADI EKO ,  Toshihiko MATSUO ,  Chihiro SAKURAZAWA

IPC: E21B10/567

Abstract: In a drill bit insert of the present invention, an insert body of the drill bit insert includes: a rear end portion forming a columnar shape or a disk-like shape; an intermediate portion having an outer diameter smaller than that of the rear end portion; and an end portion having an outer diameter from the center line of the insert gradually decreasing toward the tip side, the hard surface layer is coated on the insert body from a surface of the end portion of the insert body to an outer periphery of the intermediate portion, and an outer diameter of the hard surface layer on the intermediate portion is equal to that of the rear end portion.