公开(公告)号：US20210370412A1

公开(公告)日：2021-12-02

申请号：US17333422

申请日：2021-05-28

Applicant: TUNGALOY CORPORATION

Inventor： Tatsumi KATO ,  Jun OTSUKA ,  Takehiro IDA

IPC: B23B27/16 ,  B23C5/22

Abstract: [Problem] A cutting tool to which a cutting insert can be firmly fixed is provided.
[Means for Resolution] Provided is a cutting tool where a replaceable cutting insert having a hole for fixing is mountable. The cutting tool includes a main body portion, a lever, a pin, and a screw. The main body portion has a placement surface where the cutting insert is placed, a side wall coming into contact with at least one side surface of the cutting insert, a lever accommodating hole, a pin accommodating hole, and a screw accommodating hole. The screw presses a rear end portion of the pin by being tightened. A tip portion of the pin presses the lever by the rear end portion being pressed against the screw. The lever has a concave surface configured by a line segment parallel to a reference axis and, by the concave surface being pressed against the tip portion of the pin, a head protruding into the hole of the placed cutting insert presses an inner wall of the hole and presses and fixes the cutting insert against and to the placement surface and the side wall.

公开(公告)号：US20220347761A1

公开(公告)日：2022-11-03

申请号：US17656534

申请日：2022-03-25

Applicant: TUNGALOY CORPORATION

Inventor： Yuma KONDOU ,  Jun OTSUKA ,  Katsura MOCHIZUKI

IPC: B23B27/16

Abstract: To provide a cutting insert such that a tool body can sufficiently hold the cutting insert even if one of cutting parts is broken. The cutting insert includes two side surfaces opposed to each other, a fixing hole passing through the centers of the two side surfaces, and an outer circumferential surface that is disposed between the outer circumferential edges of the two side surfaces and are connected to the outer circumferential edges of the two side surfaces. The outer circumferential surface includes four cutting parts, a first outer circumferential surface part that is disposed between the first cutting part and the second cutting part, and a second outer circumferential surface part that is opposed to the first outer circumferential surface part and is disposed between the third cutting part and the fourth cutting part. In a side view of the side surfaces from the axial direction of the fixing hole, the first outer circumferential surface part and the second outer circumferential surface part each have the center recessed toward the fixing hole, and a virtual arc having the same diameter as the diameter of the circumcircle of the cutting insert is in contact with two points on each of the outer circumferential surface parts.

公开(公告)号：US20240189918A1

公开(公告)日：2024-06-13

申请号：US18531631

申请日：2023-12-06

Applicant: TUNGALOY CORPORATION

Inventor： Jun OTSUKA ,  Katsura MOCHIZUKI

IPC: B23B27/10 ,  B23B27/16

CPC classification number: B23B27/10 ,  B23B27/1611

Abstract: To achieve more efficient cooling and lubrication by making a coolant more reliably and directly reach a machining point even in machining such as inner diameter grooving of a small diameter or grooving of a narrow groove width with which it is difficult for a coolant to reach a machining point.
An indexable cutting tool that adopts a structure in which a cutting insert including cutting edges is removably mounted, by a set screw, on an insert mounting seat at an axial direction leading end part of a tool body includes: a coolant flow passage for coolant supply, the coolant flow passage being provided to the tool body; an opening part that is provided to the insert mounting seat; and a recessed part that forms a flow passage in which at least part of the coolant discharged from the opening part flows, the recessed part being provided to the cutting insert.

公开(公告)号：US20230024391A1

公开(公告)日：2023-01-26

申请号：US17853306

申请日：2022-06-29

Applicant: TUNGALOY CORPORATION

Inventor： Hiroki SHIMANUKI ,  Jun OTSUKA

IPC: B23B27/04

Abstract: A shank for a tool bit employing an offset arrangement is provided, the shank being able to respond to various types of machining through replacement of heads and having a structure to save time and steps necessary for such replacement of the heads. A cutting tool having such shank is also provided.
A shank 53 of a head-replaceable cutting tool has at least one head attaching part 53A, 53B that is arranged off-center relative to an axis 53X of the shank 53. The axis 53X of the shank 53 corresponds to an axis extending in a longitudinal direction of the shank 53, and the head attaching part 53A, 53B may be arranged so as to be off-center in a direction perpendicular to the axis 53X.

公开(公告)号：US20210213540A1

公开(公告)日：2021-07-15

申请号：US17142379

申请日：2021-01-06

Applicant: TUNGALOY CORPORATION

Inventor： Takehiro IDA ,  Jun OTSUKA

IPC: B23B27/16

Abstract: A cutting insert 2 includes an upper surface 6, a lower surface 7 on a side opposite to the upper surface 6, and a peripheral side surface 8 connecting the upper surface 6 and the lower surface 7. A cutting edge 61 is formed in at least a part of a first ridgeline 60 where the upper surface 6 and the peripheral side surface 8 intersect. At least one bottomed recess 10 recessed from the lower surface 7 to the upper surface 6 is formed in an outer peripheral portion of the lower surface 7. Each of the recesses 10 is formed in a substantially triangular shape having a first vertex P, a second vertex Q, and a third vertex R. The first vertex P and the second vertex Q are respectively positioned on a second ridgeline 70 where the lower surface 7 and the peripheral side surface 8 intersect. The third vertex R is positioned on the lower surface 7 and separated from the second ridgeline 70.

公开(公告)号：US20170189974A1

公开(公告)日：2017-07-06

申请号：US15312755

申请日：2015-07-13

Applicant: TUNGALOY CORPORATION

Inventor： Jun OTSUKA

IPC: B23C5/10

CPC classification number: B23C5/109 ,  B23C5/10 ,  B23C5/20 ,  B23C2200/0477 ,  B23C2200/206 ,  B23C2210/28 ,  B23C2220/60

Abstract: A rotary cutting tool has a plurality of circumferentially spaced grooves, each having a plurality of cutting inserts mounted. Each cutting insert has a wave-shaped major cutting edge, a corner cutting edge, and a minor cutting edge. The cutting inserts are arranged such that, the phases of the waves of the rotational trajectories formed by the cutting inserts that are adjacent to each other in a direction along the tool rotational axis coincide with each other in one groove. Also, the rotational trajectories of at least part of cutting edge portions of at least some cutting inserts are overlapped with each other in the direction of the tool rotational axis. Accordingly, even when the cutting edge portion is used as a major cutting edge and as an inner cutting edge, it is still possible to reduce cutting load and suppress breakage.