公开(公告)号：US20170266732A1

公开(公告)日：2017-09-21

申请号：US15505146

申请日：2015-10-16

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Naoki ANDOH ,  Minoru KOIDE ,  Takashi FUJIMOTO

IPC: B23B27/04 ,  B23B27/22 ,  B23B27/14

CPC classification number: B23B27/04 ,  B23B27/14 ,  B23B27/22

Abstract: Inclined surfaces are formed on a rake face and a recessed groove is formed in the central portion between the inclined surfaces. A groove width of the recessed groove gradually increases from the position of the end cutting edge toward the rear, then gradually decreases such that the recessed groove has a narrowest portion at a position P2 forward of the position P3 of an upper end of a breaker wall and rearward of a positive rake angle rear end position P1, and then gradually increases toward the rear up to the position P3 of the upper end of the breaker wall. The dimensional relation W1

公开(公告)号：US20200206828A1

公开(公告)日：2020-07-02

申请号：US16631305

申请日：2018-05-11

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Naoki ANDOH ,  Takuya HASEGAWA ,  Takashi FUJIMOTO

IPC: B23B27/16 ,  B23B27/22

Abstract: A cutting insert has cutting edges having the same shape and provided at respective corners of a polygon in rotational symmetry about the center axis of the polygon, is clamped in an upright position to a holder, and has a negative side rake angle on a rake face of a side cutting edge. A side cutting edge is present at an intersection ridge between a polygonal face and an outer peripheral face. The outer peripheral face includes a rake face of the cutting edge and a flank of an end cutting edge of another cutting edge different from the side cutting edge. The flank has a positive slope angle in opposition to a negative side rake angle of the side cutting edge. A breaker groove extending in a front-rear direction is formed in the rake face and cuts into the flank, in such a manner as to divide the rake face.

公开(公告)号：US20200180040A1

公开(公告)日：2020-06-11

申请号：US16616875

申请日：2018-05-11

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Naoki ANDOH

IPC: B23B29/04 ,  B23B27/10 ,  B23B27/16

Abstract: A cutting tool is configured as follows: a slit is provided rearward of a space between an upper jaw and a lower jaw; an insert held between the two jaws is clamped by screwing a threaded member having a head so as to deform the upper jaw toward the lower jaw; and the threaded member has a hollow shaft structure with its hollow serving as a coolant channel, whereby use of an elastic seal is not required, and coolant is supplied from an internal upper-jaw channel and an internal lower-jaw channel provided in the jaws. A vertical hole having a bearing surface 65 extends through a region of a holder 10 located at a lower jaw 30 side; a threaded hole 80 extends through a region of the holder 10 located at an upper jaw 20 side; a large-diameter hole 60 in the form of the vertical hole has a coolant inlet 35 of an internal lower-jaw channel 35; and the threaded hole 80 has a coolant inlet 25a of an internal upper-law channel 25 provided at a vertically intermediate position. A threaded member 70 has a hollow 77 that opens at the rear end of a head 71 and is closed at a front end 78 thereof, has branch holes 75 provided at an intermediate position of a threaded shaft 73 and communicating with the outer circumferential surface thereof, and has a screw-driving portion 79 provided in the front end 78 and adapted to tighten, for clamping, the threaded member 70 screwed into the threaded hole 80 from the large-diameter hole 60.