公开(公告)号：EP3424622B1

公开(公告)日：2020-11-11

申请号：EP17760068.1

申请日：2017-03-01

申请人： NTN Corporation

发明人： YASHIRO Naoki ,  OOHIRA Kouya

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

公开(公告)号：EP3018228A1

公开(公告)日：2016-05-11

申请号：EP14819452.5

申请日：2014-06-03

申请人： NTN Corporation

发明人： OKUNO Takahiro ,  YASHIRO Naoki ,  OOHIRA Kouya

IPC分类号： C22C38/00 ,  B22F1/00 ,  B22F5/08 ,  C22C33/02 ,  F16H53/02 ,  F16H55/06

CPC分类号： F16H55/06 ,  B22F1/007 ,  B22F3/16 ,  B22F5/08 ,  B22F2003/026 ,  B22F2301/35 ,  B22F2302/40 ,  B22F2304/10 ,  B22F2998/10 ,  C22C33/0264 ,  C22C38/00 ,  C22C38/08 ,  C22C38/12 ,  F16H53/025 ,  F16H55/17

摘要： A sintered compact having a density of 7.5 g/cm 3 or more is formed by mixed powder. The mixed powder is obtained by mixing graphite powder having an average particle diameter of 8 µm or less and diffusion alloyed steel powder. The ratio of the graphite powder is from 0.05 wt% to 0.35 wt% with respect to 100 wt% of the diffusion alloyed steel powder. Or, the mixed powder is obtained by mixing the graphite powder and completely alloyed steel powder. The ratio of the graphite powder is from 0.15 wt% to 0.35 wt% with respect to 100 wt% of the completely alloyed steel powder.

摘要翻译： 通过混合粉末形成密度为7.5g / cm 3以上的烧结体。 混合粉末通过混合平均粒径为8μm以下的石墨粉末和扩散合金钢粉末而获得。 相对于100重量％的扩散合金钢粉，石墨粉的比例为0.05重量％〜0.35重量％。 或者，通过混合石墨粉末和完全合金化的钢粉末来获得混合粉末。 相对于完全合金化的钢粉末的100重量％，石墨粉末的比例为0.15重量％〜0.35重量％。

公开(公告)号：EP3424622A1

公开(公告)日：2019-01-09

申请号：EP17760068.1

申请日：2017-03-01

申请人： NTN Corporation

发明人： YASHIRO Naoki ,  OOHIRA Kouya

IPC分类号： B22F3/24 ,  B22F1/00 ,  B22F3/02 ,  F16C33/12

摘要： 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：EP3128193A1

公开(公告)日：2017-02-08

申请号：EP15765601.8

申请日：2015-03-19

申请人： NTN Corporation

发明人： YASHIRO Naoki ,  ITOU Yuuta ,  OKUNO Takahiro ,  OOHIRA Kouya

IPC分类号： F16C33/64 ,  B22F1/00 ,  B22F3/10 ,  B22F3/24 ,  B22F5/00 ,  C22C38/00 ,  C22C38/12 ,  F16C19/06 ,  F16C33/62 ,  F16C33/78

CPC分类号： 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

摘要： 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 √area max 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.

摘要翻译： 将部分扩散合金钢粉末进行压缩成型，然后烧结以形成烧结金属材料（10'），并通过塑性加工在烧结金属材料（10'）上形成滚道表面（2），从而制造 一个跑道环（1）。 至少使用滚道环（1）的风险量作为预测体积，估计至少在预测体积中存在的最大孔包络面积的平方根š最大值设定为小于50μm。 为此，提供了一种滚动轴承的滚道环，其具有较低的滚动疲劳寿命。

公开(公告)号：EP3097999A1

公开(公告)日：2016-11-30

申请号：EP14880315.8

申请日：2014-12-22

申请人： NTN Corporation

发明人： OKUNO Takahiro ,  YASHIRO Naoki ,  OOHIRA Kouya ,  FUJIKAWA Masamichi

IPC分类号： B22F3/02 ,  C22C33/02 ,  C22C38/00 ,  C22C38/08

CPC分类号： F16H55/06 ,  B22F1/0003 ,  B22F3/16 ,  B22F5/08 ,  B22F2003/242 ,  B22F2003/248 ,  B22F2201/02 ,  B22F2201/30 ,  B22F2302/40 ,  B22F2302/45 ,  B22F2998/10 ,  C21D9/32 ,  C22C33/02 ,  C22C38/00 ,  C22C38/08 ,  C22C38/12 ,  C23C8/26 ,  C23C8/32 ,  C23C8/50 ,  C23C8/54 ,  F16H55/17

摘要： A sintered machine part is formed of an iron-based sintered body obtained by molding and sintering raw material powder containing iron-based partially diffusion-alloyed steel powder. The iron-based sintered body has a ratio of carbon of 0.35 wt% or less. The iron-based sintered body has a density of 7.55 g/cm 3 or more. The iron-based sintered body has a square root √area max of an estimated maximum pore envelope area of 200 µm or less in an estimation target region set in a surface layer from a surface to a predetermined depth.

摘要翻译： 烧结机部由通过对含有铁基部分扩散合金钢粉末的原料粉末进行成型和烧结而得到的铁基烧结体形成。 铁基烧结体的碳比例为0.35重量％以下。 铁基烧结体的密度为7.55g / cm 3以上。 铁基烧结体在从表面到预定深度的表面层中设置的估计目标区域中具有估计的最大孔包络面积为200μm以下的平方根š最大值。

公开(公告)号：EP3088106A1

公开(公告)日：2016-11-02

申请号：EP14873470.0

申请日：2014-11-26

申请人： NTN Corporation

发明人： YASHIRO Naoki ,  KAKO Noritaka ,  OOHIRA Kouya

IPC分类号： B22F3/24 ,  B22F5/00

CPC分类号： B22F3/24 ,  B22F1/0062 ,  B22F3/02 ,  B22F2003/023 ,  B22F2201/05

摘要： 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.

摘要翻译： 通过以下方式制造径向抗压强度大于100MPa的机器部件：以能够形成氧化膜的金属粉末为主要原料的压制成形原料粉末，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膜。