公开(公告)号：US20240229884A9

公开(公告)日：2024-07-11

申请号：US18399940

申请日：2023-12-29

Applicant: NHK SPRING CO., LTD.

Inventor： Hideki OKADA ,  Yuichiro YAMAUCHI ,  Ryo TANAKA ,  Takeshi SUZUKI ,  Kosuke SHIBAIRI

IPC: F16F1/04 ,  B60G11/14

CPC classification number: F16F1/042 ,  B60G11/14 ,  B60G2204/1244 ,  F16F2226/023

Abstract: According to an embodiment, a coil spring is formed of a wire which is helically wound, and includes an end turn portion and an effective portion, and a surface of the wire in the end turn portion includes an area which is softer than a surface of the wire in the effective portion.

公开(公告)号：US20180354098A1

公开(公告)日：2018-12-13

申请号：US16107629

申请日：2018-08-21

Applicant: NHK SPRING CO., LTD.

Inventor： Hideki OKADA ,  Daisuke YOKOTA ,  Senri MORIYAMA ,  Satoshi AKIYAMA ,  Masaya KOMAZAKI ,  Go NAGAYASU

IPC: B24C1/10

Abstract: A coil spring processing device includes an end positioning device, shot peening device, and controller. The end positioning device positions ends of a coil spring. The shot peening device includes a turntable mechanism, pressure mechanism, rotation mechanism which rotates the coil spring, and projection mechanism which projects shots. Holding mechanisms each include a lower shifting prevention jig and an upper shifting prevention jig. The controller stops a first holding mechanism and a second holding mechanism in rotation stop positions corresponding to end turn portions of the coil spring.

公开(公告)号：US20240133440A1

公开(公告)日：2024-04-25

申请号：US18399940

申请日：2023-12-29

Applicant: NHK SPRING CO., LTD.

Inventor： Hideki OKADA ,  Yuichiro YAMAUCHI ,  Ryo TANAKA ,  Takeshi SUZUKI ,  Kosuke SHIBAIRI

IPC: F16F1/04 ,  B60G11/14

CPC classification number: F16F1/042 ,  B60G11/14 ,  B60G2204/1244 ,  F16F2226/023

Abstract: According to an embodiment, a coil spring is formed of a wire which is helically wound, and includes an end turn portion and an effective portion, and a surface of the wire in the end turn portion includes an area which is softer than a surface of the wire in the effective portion.

公开(公告)号：US20190126706A1

公开(公告)日：2019-05-02

申请号：US16231569

申请日：2018-12-23

Applicant: NHK SPRING CO., LTD.

Inventor： Akira TANGE ,  Hideki OKADA

IPC: B60G11/14 ,  B60G11/16 ,  F16F1/04 ,  C21D7/06

CPC classification number: B60G11/14 ,  B60G11/16 ,  B60G2202/12 ,  B60G2206/42 ,  B60G2206/81 ,  B60G2206/8402 ,  B60G2206/8403 ,  B60G2500/20 ,  C21D7/06 ,  C21D9/02 ,  F16F1/04 ,  F16F2226/02

Abstract: A method of manufacturing a suspension coil spring includes forming first shot peening indentations on a surface of a wire by projecting first shots toward the wire and forming a compressive residual stress portion to which a compressive residual stress is imparted from the surface of the wire to a first depth, and projecting ball shots as second shots toward a lower end turn portion by an ultrasonic apparatus. A size of each ball shot is larger than a size of each first shot. The method includes forming second shot peening indentations on a surface of the lower end turn portion, and a deep residual stress portion in the lower end turn portion, a compressive residual stress of the deep residual stress portion imparted from the surface of the wire to a second depth that is deeper than the first depth.

公开(公告)号：US20170349961A1

公开(公告)日：2017-12-07

申请号：US15534470

申请日：2015-12-07

Applicant: NHK SPRING CO., LTD.

Inventor： Shinichiro KUWATSUKA ,  Yurika OKUDAIRA ,  Akira TANGE ,  Hideki OKADA ,  Ken TAKAHASHI

IPC: C21D9/00 ,  B21D53/88 ,  B24C1/10 ,  C21D1/60 ,  C21D6/00 ,  B21D47/00 ,  C21D8/06 ,  C22C38/00 ,  C22C38/54 ,  C22C38/44 ,  C22C38/42 ,  C22C38/04 ,  C22C38/02 ,  C21D7/06 ,  F16F1/02 ,  F16F1/14 ,  B60G21/055

CPC classification number: C21D9/0068 ,  B21D47/00 ,  B21D53/88 ,  B24C1/10 ,  B60G21/055 ,  B60G2206/724 ,  B60G2206/8103 ,  B60G2206/8402 ,  B60G2206/8403 ,  C21D1/60 ,  C21D6/00 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D7/06 ,  C21D8/06 ,  C21D8/065 ,  C21D9/00 ,  C21D9/0075 ,  C21D9/02 ,  C21D9/08 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/44 ,  C22C38/54 ,  C22C38/60 ,  F16F1/02 ,  F16F1/021 ,  F16F1/14 ,  F16F2224/0208 ,  F16F2226/00

Abstract: The invention provides a production method for stabilizers which produces with high productivity in a compact production line, without tempering. The production method for stabilizers of the invention includes: forming a steel bar material containing at least C: 0.15 wt % to 0.39 wt %, Mn, B and Fe into a product shape by bending; and quenching the bent steel bar material in a medium having a heat transfer coefficient higher than or close to that of water.

公开(公告)号：US20190232462A1

公开(公告)日：2019-08-01

申请号：US16383231

申请日：2019-04-12

Applicant: NHK SPRING CO., LTD.

Inventor： Senri MORIYAMA ,  Satoshi AKIYAMA ,  Masaya KOMAZAKI ,  Go NAGAYASU ,  Hideki OKADA ,  Daisuke YOKOTA

IPC: B24C1/10 ,  F16F1/04 ,  B24C3/24 ,  F16F1/02

CPC classification number: B24C1/10 ,  B24C3/24 ,  F16F1/02 ,  F16F1/04

Abstract: A coil spring includes a helically formed wire having end turn portions at ends thereof, a plurality of first rough surfaces, each including first shot peening indentations formed on a part of a surface of the end turn portions, and a second rough surface including second shot peening indentations formed on the entire surface of the wire except for the first rough surface. The second rough surface has a surface roughness different from that of the first rough surface.

公开(公告)号：US20180354097A1

公开(公告)日：2018-12-13

申请号：US16107507

申请日：2018-08-21

Applicant: NHK SPRING CO., LTD.

Inventor： Hideki OKADA ,  Daisuke YOKOTA ,  Senri MORIYAMA ,  Satoshi AKIYAMA ,  Masaya KOMAZAKI ,  Go NAGAYASU

IPC: B24C1/10

CPC classification number: B24C1/10 ,  B24C3/24 ,  B24C3/32 ,  B24C9/00

Abstract: A shot peening device includes a turntable which rotates about a revolution axis, holding mechanism which moves with the turntable, pressure mechanism which compresses a coil spring, rotation mechanism which rotates the coil spring, projection mechanism which projects shots to the compressed coil spring, load cell which detects a load applied to the coil spring, and controller. A signal output from the load cell is input to the controller, and the controller detects a chronological change of the load applied to the coil spring during the shot peening.

公开(公告)号：US20130240093A1

公开(公告)日：2013-09-19

申请号：US13886106

申请日：2013-05-02

Applicant: NHK SPRING CO., LTD.

Inventor： Hideki OKADA ,  Akira TANGE ,  Koichi TANGO ,  Isao SUMIYOSHI

IPC: F16F1/02 ,  C22C38/50 ,  C22C38/00 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C21D9/02 ,  C22C38/42

CPC classification number: F16F1/021 ,  C21D7/06 ,  C21D8/06 ,  C21D8/065 ,  C21D9/02 ,  C21D9/52 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/28 ,  C22C38/34 ,  C22C38/42 ,  C22C38/46 ,  C22C38/50 ,  F16F1/02

Abstract: A steel for high-strength spring has an Ac3 transformation temperature as an indicator of the decarburization performance, which is calculated by Equation (1) below, is from 859 to 885° C., a maximum hardened diameter DI as an indicator of the hardening performance, which is calculated by Equation (2) below, is from 70 to 238 mm, and a temper hardness HRC as an indicator of the spring performance, which is calculated by Equation (3) below, is from 50 to 55. Ac3=910−203×√{square root over (C)}−15.2Ni+44.7Si+104V+31.5Mo+13.1W  (1) DI=DO×fSi×fMn×fP×fS×fCu×fNi×fCr  (2) HRC=38.99+17.48C+2.55Si−2.28Ni+2.37Cr+8.04Ti  (3) wherein, D0=8.65×√{square root over (C)}, fSi=1+0.64×% Si, fMn=1+4.10×% Mn, fP=1+2.83×% P, fS=1−0.62×% S, fCu=1+0.27×% Cu, fNi=1+0.52×% Ni, and fCr=1+2.33×% Cr.

Abstract translation: 用于高强度弹簧的钢具有作为脱碳性能的指示剂的Ac 3相变温度，其由下式（1）计算，为859〜885℃，最大硬化直径DI为硬化指标 由下式（2）计算的性能为70〜238mm，由下式（3）计算出的作为弹簧性能的指标的回火硬度HRC为50〜55。Ac3 = 910-203×√{平方根（C）} - 15.2Ni + 44.7Si + 104V + 31.5Mo + 13.1W（1）DI = DO×fSi×fMn×fP×fS×fCu×fNi×fCr（2） HRC = 38.99 + 17.48℃+ 2.55Si-2.28Ni + 2.37Cr + 8.04Ti（3）其中，D0 = 8.65×√{平方根超过（C）}，fSi = 1 + 0.64×％Si，fMn = 1 + 4.10×％Mn，fP = 1 + 2.83×％P，fS = 1-0.62×％S，fCu = 1 + 0.27×％Cu，fNi = 1 + 0.52×％Ni，fCr = 1 + 2.33×％ 。

公开(公告)号：US20170349962A1

公开(公告)日：2017-12-07

申请号：US15534472

申请日：2015-12-04

Applicant: NHK SPRING CO., LTD.

Inventor： Shinichiro KUWATSUKA ,  Yurika OKUDAIRA ,  Akira TANGE ,  Hideki OKADA ,  Ken TAKAHASHI

IPC: C21D9/00 ,  B21D47/00 ,  C22C38/42 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/44 ,  B21D53/88 ,  C21D8/06 ,  C21D7/06 ,  C21D6/00 ,  C21D1/60 ,  B60G21/055 ,  B24C1/10 ,  C22C38/54

CPC classification number: C21D9/0068 ,  B21D47/00 ,  B21D53/88 ,  B24C1/10 ,  B60G21/055 ,  B60G2206/427 ,  B60G2206/724 ,  B60G2206/81035 ,  B60G2206/8402 ,  B60G2206/8403 ,  C21D1/60 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D7/06 ,  C21D8/065 ,  C21D9/0075 ,  C21D9/02 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/44 ,  C22C38/54 ,  C22C38/60 ,  F16F1/14

Abstract: A stabilizer formed by using a metal bar having a solid structure and configured to reduce a displacement between right and left wheels, including a torsion part extending in a vehicle width direction, being capable of a torsional deformation, and having a diameter of 10 to 32 mm, is provided. The stabilizer has a chemical composition containing at least C: 0.15% by mass or more to 0.39% by mass or less, Mn, B, and Fe, and also has a metal structure 90% or more of which is a martensite structure.

公开(公告)号：US20170157744A1

公开(公告)日：2017-06-08

申请号：US15434519

申请日：2017-02-16

Applicant: NHK SPRING CO., LTD.

Inventor： Senri MORIYAMA ,  Satoshi AKIYAMA ,  Masaya KOMAZAKI ,  Go NAGAYASU ,  Hideki OKADA ,  Daisuke YOKOTA

IPC: B24C1/10 ,  F16F1/04 ,  B24C3/24

CPC classification number: B24C1/10 ,  B24C3/24 ,  F16F1/02 ,  F16F1/04

Abstract: A vertical motion impeller-type shot peening device performs a second shot peening to a coil spring including first shot peening indentations. The vertical motion impeller-type shot peening device includes a workpiece holding mechanism including a lower end turn support and an upper end turn support, a stress applying mechanism which compresses the coil spring, a rotation mechanism, and a projection mechanism which includes a pair of vertically movable impeller units. A first rough surface including first shot peening indentations is formed on a part of end turn portions of the coil spring. A second rough surface including second shot peening indentations is formed on the entire surface of wire except for the first rough surface.