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公开(公告)号：US20250033127A1
公开(公告)日：2025-01-30
申请号：US18707172
申请日：2021-12-24
Applicant: OSG CORPORATION
Inventor： Tasuku ITOH
IPC: B23C5/10
Abstract: End mill is provided with outer periphery cutting edges and end cutting edges along spiral flutes. Spiral flutes include first and second flutes. Flute bottom of first flute is with linear portion, R-shaped portion, and gradient portion. The linear portion extends in parallel to axis line O and in straight-line shape, from tool distal end toward rear end side to position separated from the tool distal end by length corresponding to tool outer diameter. The gradient portion is provided to the rear end side, and is inclined straightly toward outer side in radial direction toward the rear end side. The R-shaped portion connects rear end of the linear portion and front end of the gradient portion, and is curved in circular arc shape toward the outer side in the radial direction. Rake angles of the outer periphery and end cutting edges are constant over entire periphery.
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公开(公告)号：US20240384393A1
公开(公告)日：2024-11-21
申请号：US18689332
申请日：2021-09-30
Applicant: OSG CORPORATION
Inventor： Yoshitaka ADACHI , Hiroki GIMA , Hiroaki SUGITA
Abstract: A hard coating includes first and second layers. The first layer is constituted by AlaCrbαcN, wherein atomic ratios a, b, c satisfy a+b+c=1, 0≤c≤0.40 and 0.25≤b/a≤1.0, and an optional additive component α is at least one kind of element selected from groups IVa, Va and VIa (except Cr) and Y of periodic table of elements. The second layer is constituted by AldCreCfN, wherein atomic ratios d, e, f satisfy d+e+f=1, 0.001≤f≤0.20 and 0.25≤ e/d≤1.0. A total thickness T of a thickness T1 of the first layer and a thickness T2 of the second layer is 0.5-9.0 μm. A ratio of the thickness T2 to the total thickness T is 5-50%. The hard coating has peaks belonging to (111) and (200) planes in an X-ray diffraction, such that an intensity ratio of a peak intensity SP1 of the (111) plane to a peak intensity SP2 of the (200) plane is 0.1-20.
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公开(公告)号：US12042873B2
公开(公告)日：2024-07-23
申请号：US17793537
申请日：2020-01-21
Applicant: OSG CORPORATION
Inventor： Kazumitsu Harada
IPC: B23G7/02
CPC classification number: B23G7/02
Abstract: A thread forming tap including a complete thread portion and a leading portion is to be screwed into a prepared hole provided in a workpiece so as to cause an inner circumferential surface of the prepared hole to be plastically deformed for thereby forming an internal thread corresponding to the external thread provided in the complete thread portion. A screw thread of the external thread has a leading flank and a trailing flank, which are to be positioned on a front side of the trailing flank and on a rear side of the leading flank, respectively, when the thread forming tap is screwed into the prepared hole. The screw thread is shaped such that, in the leading portion, an indentation depth into the workpiece made by the leading flank is smaller than an indentation depth into the workpiece made by the trailing flank.
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公开(公告)号：US11986896B2
公开(公告)日：2024-05-21
申请号：US16981083
申请日：2018-05-31
Applicant: OSG CORPORATION
Inventor： Kazumitsu Harada
IPC: B23G7/02
CPC classification number: B23G7/02 , B23G2200/34
Abstract: A thread forming tap including a complete thread portion and a leading portion that are provided with an external thread. A thread ridge of the external thread has, in an axial cross section, a triangular shape that is defined by a pair of flanks located on respective opposite sides in an axial direction, such that each of the flanks is inclined by a predetermined flank angle corresponding to a shape of a valley of an internal thread to be formed. A sharp crest is provided in a top portion of the thread ridge at least in the leading portion, and has, in the axial cross section, a triangular shape that is defined by a pair of side surfaces located on respective opposite sides in the axial direction, such that each of the side surfaces is inclined by an inclination angle that is larger than the flank angle.
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公开(公告)号：US20240058906A1
公开(公告)日：2024-02-22
申请号：US18270828
申请日：2021-02-26
Applicant: OSG CORPORATION
Inventor： Teruya HISADA , Takayuki NAKAJIMA
Abstract: A method of producing a nitrided cut tap that includes a nitrogen diffusion layer. The method includes (a) a nitriding step for forming the nitrogen diffusion layer in which nitrogen atoms contained in an atmospheric gas are diffused from a surface of a base material of the cut tap under heat, such that the nitrogen diffusion layer has a thickness ranging from 10 μm to 30 μm; and (b) a honing step for rounding a cutting edge portion by colliding abrasive particles against a local part of the cutting edge portion of the base material of the cut tap that has been subjected to the nitriding step, such that a difference between a thickness of the nitrogen diffusion layer in the cutting edge portion and a thickness of the nitrogen diffusion layer in flank and rake surfaces sandwiching the cutting edge portion, is not larger than 5 μm.
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Patent Agency Ranking
公开(公告)号：US20240001463A1
公开(公告)日：2024-01-04
申请号：US18254647
申请日：2020-11-30
Applicant: OSG CORPORATION
Inventor： Shigetoshi UKEI , Masataka ISOBE
IPC: B23C5/10
CPC classification number: B23C5/10 , B23C2210/0492 , B23C2210/282 , B23C2226/31
Abstract: An end mill includes a plurality of peripheral cutting edges that are defined by three types of teeth including a right-handed helical tooth that is twisted rightward, a left-handed helical tooth that is twisted leftward, and a curved tooth which is twisted in a direction reversed right and left on a way thereof and which has a curved shape curved in an arcuate or arched manner in a development view of an outer circumferential surface of the end mill around an axis such that a corresponding one of the peripheral cutting edges is provided on a concave side of the curved shape. Each adjacent pair of the peripheral cutting edges adjacent to each other are defined by the respective teeth that are different in type from each other.
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公开(公告)号：US20230302513A1
公开(公告)日：2023-09-28
申请号：US17911966
申请日：2022-03-26
Applicant: OSG CORPORATION
Inventor： Teruya Hisada
CPC classification number: B21B27/02 , C23C28/044 , C23C8/26
Abstract: Provided is a rolling die that increases the durability of a nitrided molded surface. The rolling die (1) includes a tool base material that is made of steel and has a molded surface (2) on which a plurality of working teeth (10) is formed. The tool base material includes a nitride layer (15) in which nitrogen is diffused. The nitride layer (15) is disposed to reach a position that is 20 to 70 μm in depth from the molded surface (2). The molded surface (2) has a surface hardness of at least 1100 HV. The rate of depth change from the depth (D1) of the nitride layer (15) at crests (11) of the working teeth (10) to the depth (D2) of the nitride layer (15) at roots (13) of the working teeth (10) is not higher than 30%.
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公开(公告)号：US20230122014A1
公开(公告)日：2023-04-20
申请号：US17793517
申请日：2020-01-21
Applicant: OSG CORPORATION
Inventor： Kazumitsu HARADA
IPC: B23G7/02
Abstract: A ballscrew thread forming tap including a complete thread portion and a leading portion is to be screwed into a prepared hole provided in a workpiece so as to cause an inner circumferential surface of the prepared hole to be plastically deformed for thereby forming a ballscrew thread corresponding to an external thread provided in the complete thread portion. A screw thread of the external thread has a leading flank and a trailing flank, which are to be positioned on a front side of the trailing flank and on a rear side of the leading flank, respectively, when the ballscrew thread forming tap is screwed into the prepared hole. The screw thread is formed such that, in the leading portion, an indentation depth into the workpiece made by the leading flank is smaller than an indentation depth into the workpiece made by the trailing flank.
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公开(公告)号：US20230049644A1
公开(公告)日：2023-02-16
申请号：US17793537
申请日：2020-01-21
Applicant: OSG CORPORATION
Inventor： Kazumitsu HARADA
IPC: B23G7/02
Abstract: A thread forming tap including a complete thread portion and a leading portion is to be screwed into a prepared hole provided in a workpiece so as to cause an inner circumferential surface of the prepared hole to be plastically deformed for thereby forming an internal thread corresponding to the external thread provided in the complete thread portion. A screw thread of the external thread has a leading flank and a trailing flank, which are to be positioned on a front side of the trailing flank and on a rear side of the leading flank, respectively, when the thread forming tap is screwed into the prepared hole. The screw thread is shaped such that, in the leading portion, an indentation depth into the workpiece made by the leading flank is smaller than an indentation depth into the workpiece made by the trailing flank.
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公开(公告)号：US11453072B2
公开(公告)日：2022-09-27
申请号：US16349683
申请日：2017-01-18
Applicant: OSG CORPORATION
Inventor： Tomonori Yoda
Abstract: The end cutting edges formed on the front end face of the tool body includes a first end cutting edge that is connected to the front end of the thread cutting edge, and a second end cutting edge that is connected to the first end cutting edge on the side closer to the axis, and is angled more toward the rear end than the first end cutting edge. The angle formed by an imaginary plane perpendicular to the axis and the first end cutting edge is set to 6° or less. The angle formed by the second end cutting edges and the imaginary plane perpendicular to the axis and is set to be greater than the angle formed by the first end cutting edges and the imaginary plane perpendicular to the axis.
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