公开(公告)号：US20170108045A1

公开(公告)日：2017-04-20

申请号：US15127236

申请日：2015-03-19

Applicant: NTN CORPORATION

Inventor： Naoki YASHIRO ,  Yuuta ITOU ,  Takahiro OKUNO ,  Kouya OOHIRA

IPC: F16C33/64 ,  F16C33/62 ,  F16C33/78 ,  B22F3/16 ,  C21D1/18 ,  C22C38/12 ,  C22C38/08 ,  C21D9/40 ,  C21D8/00 ,  F16C19/06 ,  B22F3/24

CPC classification number: F16C33/64 ,  B22F3/16 ,  B22F3/24 ,  B22F5/106 ,  B22F2003/248 ,  B22F2301/35 ,  B22F2998/10 ,  C21D1/18 ,  C21D8/005 ,  C21D9/40 ,  C22C33/02 ,  C22C38/00 ,  C22C38/08 ,  C22C38/12 ,  F16C19/06 ,  F16C33/62 ,  F16C33/7856 ,  F16C2204/60 ,  F16C2220/20 ,  F16C2220/44 ,  F16C2223/10 ,  B22F3/02 ,  B22F3/10

Abstract: Partially diffusion-alloyed steel powder is subjected to compression molding and then sintered to form a sintered metal material (10′), and a raceway surface (2) is formed on the sintered metal material (10′) through plastic working, to thereby manufacture a raceway ring (1). With at least a risk volume of the raceway ring (1) being adopted as a prediction volume, a square root √areamax of the maximum pore envelope area estimated to be present at least in the prediction volume is set to be less than 50 μm. With this, there is provided a raceway ring for a rolling bearing that has an increased rolling fatigue life at low cost.

公开(公告)号：US20160311026A1

公开(公告)日：2016-10-27

申请号：US15101958

申请日：2014-11-26

Applicant: NTN CORPORATION

Inventor： Naoki YASHIRO ,  Noritaka KAKO ,  Kouya OOHIRA

IPC: B22F3/24 ,  B22F3/02

CPC classification number: B22F3/24 ,  B22F1/0062 ,  B22F3/02 ,  B22F2003/023 ,  B22F2201/05

Abstract: A machine part having a radial crushing strength of more than 100 MPa is manufactured by: press forming raw material powder containing, as a main raw material, metal powder capable of forming an oxide film, to thereby provide a green compact; and forming the oxide film between particles of the metal powder forming the green compact through steam treatment.

Abstract translation: 具有大于100MPa的径向破碎强度的机器部件通过以下方式制造：将形成氧化膜的金属粉末作为主要原料的压制成型原料粉末，由此提供生坯; 以及通过蒸汽处理在形成所述生坯的所述金属粉末的颗粒之间形成所述氧化物膜。

公开(公告)号：US20210308760A1

公开(公告)日：2021-10-07

申请号：US16078786

申请日：2017-03-01

Applicant: NTN CORPORATION

Inventor： Naoki YASHIRO ,  Kouya OOHIRA

IPC: B22F3/11 ,  B22F3/24 ,  B22F1/00 ,  B22F1/02 ,  B22F5/10 ,  F16C17/10

Abstract: Provided is a method of manufacturing a machine part having a radial crushing strength of 120 MPa or more, including: a compression molding step of compressing raw material powder including, as a main component, metal powder that is capable of forming an oxide coating and has a pure iron powder content ratio of 95 mass % or more, to thereby obtain a green compact (10) having a predetermined shape; and a coating forming step of causing the metal powder to react with an oxidizing gas while heating the green compact (10) at a temperature lower than a sintering temperature of the metal powder in an oxidizing gas atmosphere, to thereby obtain a reinforced green compact (11) in which the oxide coating (5) is formed between particles of the metal powder.

公开(公告)号：US20180056394A1

公开(公告)日：2018-03-01

申请号：US15557577

申请日：2016-03-15

Applicant: NTN CORPORATION

Inventor： Naoki YASHIRO ,  Kouya OOHIRA

IPC: B22F3/11 ,  B22F3/02 ,  C22C1/05 ,  C22C1/08 ,  C22C33/02 ,  F16C33/12

CPC classification number: B22F3/11 ,  B22F3/02 ,  B22F2003/023 ,  C22C1/05 ,  C22C1/08 ,  C22C33/02 ,  F16C33/104 ,  F16C33/12 ,  F16C33/128 ,  F16C33/145

Abstract: A machine part (an oil-impregnated bearing (1)) is obtained by subjecting a green compact to heat treatment in an oxidizing atmosphere (for example, in air), the green compact being obtained by compacting and forming raw material powder containing iron powder and copper powder. Iron particles (10) and copper particles (20) are bonded to each other with oxide films (11) and (21) formed on surfaces of the particles. The oxide films (11) and (21) each have a maximum thickness of 1 μm or less in a region at a depth of 300 μm±10 μm from a surface of the green compact.

公开(公告)号：US20170343044A1

公开(公告)日：2017-11-30

申请号：US15533716

申请日：2015-11-20

Applicant: NTN CORPORATION

Inventor： Naoki YASHIRO ,  Kouya OOHIRA

IPC: F16C33/14 ,  B22F3/02 ,  F16C33/10 ,  B22F3/24 ,  F16C33/12

CPC classification number: F16C33/145 ,  B22F1/0007 ,  B22F1/02 ,  B22F3/02 ,  B22F3/11 ,  B22F3/225 ,  B22F3/24 ,  B22F3/26 ,  B22F5/10 ,  B22F2003/242 ,  B22F2009/0828 ,  B22F2301/35 ,  B22F2998/10 ,  F16C33/1025 ,  F16C33/128 ,  F16C2220/20 ,  B22F3/1021 ,  B22F2201/05

Abstract: A green compact according to the present invention is a green compact, which is obtained by compaction-molding raw material powder containing metal powder as a main raw material, the green compact including an oxide film formed between particles of the raw material powder forming the green compact, the oxide film binding the particles of the raw material powder to each other, in which the metal powder to toe used includes metal powder showing a circularity R at a cumulative frequency of 80% of 0.75 or more, the circularity R being expressed by Equation (1), where S represents a two-dimensional projected area of the metal powder and L represents a two-dimensional projected circumferential length of the metal powder. R = 4  π × S L 2 ( 1 )

公开(公告)号：US20160341251A1

公开(公告)日：2016-11-24

申请号：US15117408

申请日：2015-02-06

Applicant: NTN CORPORATION

Inventor： Noriyoshi YOSHIZUKA ,  Naoki YASHIRO ,  Kouya OOHIRA ,  Takuya ISHII

IPC: F16C33/20 ,  B29C45/14 ,  B22F3/02 ,  B22F5/10 ,  F16C17/02 ,  F16C33/12

CPC classification number: F16C33/208 ,  B22F1/0059 ,  B22F3/02 ,  B22F5/106 ,  B22F7/08 ,  B29C45/1459 ,  B29K2023/0683 ,  B29K2027/18 ,  B29K2905/12 ,  B29L2031/04 ,  C22C33/0264 ,  F16C17/02 ,  F16C17/10 ,  F16C33/128 ,  F16C33/201 ,  F16C2208/02 ,  F16C2208/32 ,  F16C2208/78 ,  F16C2220/20 ,  F16C2370/00

Abstract: Provided is a sliding bearing that can keep the price low while maintaining a bearing property over a long period. The sliding bearing is a sliding bearing 1 having a bearing periphery portion 2 formed of a metal base material, and a resin layer 3 formed on a surface to be a sliding surface of the bearing periphery portion, wherein the metal base material is an unsintered green compact formed by compacting a raw material powder containing a metal powder capable of forming an oxide film as a major raw material, and the oxide film has been formed between particles of the metal powder by means of steam treatment or the like, and the unsintered green compact has a radial crushing strength of more than 100 MPa.

Abstract translation: 提供一种能够在保持轴承性能的同时保持价格低的滑动轴承。 滑动轴承是具有由金属基材形成的轴承周边部分2的滑动轴承1和形成在作为轴承周边部分的滑动面的表面上的树脂层3，其中金属基材是未烧结的绿色 通过压制含有能够形成氧化膜的金属粉末作为主要原料的原料粉末形成的压块，并且通过蒸汽处理等在金属粉末的颗粒之间形成氧化物膜，并且未烧结的绿色 紧凑型的径向破碎强度大于100MPa。