公开(公告)号：US20190032191A1

公开(公告)日：2019-01-31

申请号：US16145158

申请日：2018-09-27

Applicant: NHK SPRING CO., LTD.

Inventor： Morimichi KAI ,  Akira TANGE

IPC: C23C8/22 ,  C21D9/02 ,  C21D1/06 ,  C23C8/80 ,  C23C8/02 ,  C23C8/04 ,  C21D9/08 ,  F16F1/14 ,  B60G21/055 ,  F16F1/04 ,  B60G11/14 ,  F16F1/06

Abstract: A hollow spring member and hollow spring member production method can be provided, which can save the time and energy necessary for carburization, thus requiring no dedicated carburizing furnace or the like for carburization, and further can make the interior space of a steel tube a rust-prevention atmosphere. A hollow stabilizer for a vehicle includes a steel tube sealed at one end and another end thereof and a carburizing gas sealed in the interior space of the steel tube.

公开(公告)号：US20180080113A1

公开(公告)日：2018-03-22

申请号：US15814892

申请日：2017-11-16

Applicant: NATIONAL UNIVERSITY CORPORATION YOKOHAMA NATIONAL UNIVERSITY ,  NHK SPRING CO., LTD.

Inventor： Wataru NAKAO ,  Akira TANGE ,  Koichi TANGO ,  Morimichi KAI

IPC: C23C8/22 ,  C21D1/06 ,  C23C8/80

CPC classification number: C23C8/22 ,  C21D1/06 ,  C21D9/02 ,  C23C8/20 ,  C23C8/80 ,  F27B9/045 ,  F27B9/3005 ,  F27B9/40 ,  F27D17/004

Abstract: A carburization device includes a heating furnace which heats a material, a transfer mechanism, an alcohol vapor generator, an alcohol vapor spraying portion, a quenching tank, and an exhaust heat intake tube. The transfer mechanism moves a plurality of materials. The alcohol vapor generator uses part of heat generated by the heating furnace as a heat source. As the alcohol vapor spraying portion repeats a vapor spraying step and a diffusion step a plurality of times in the heating furnace. In the vapor spraying step, by spraying alcohol vapor on the material which moves inside the heating furnace, carbon in the alcohol is adsorbed to the material. In the diffusion step, an interval for diffusing the carbon adsorbed to the material is taken.

公开(公告)号：US20170130288A1

公开(公告)日：2017-05-11

申请号：US15127920

申请日：2015-03-23

Applicant: JFE Bars & Shapes Corporation ,  NHK SPRING CO., LTD.

Inventor： Kazuaki FUKUOKA ,  Kunikazu TOMITA ,  Akira TANGE ,  Kiyoshi KURIMOTO ,  Yurika GOTO

IPC: C21D9/00 ,  C21D1/60 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  B60G21/055 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/06 ,  C22C38/46

CPC classification number: C21D9/0068 ,  B60G21/055 ,  C21D1/18 ,  C21D1/60 ,  C21D7/06 ,  C21D8/065 ,  C22C38/00 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

Abstract: A steel has a predetermined chemical composition with a balance being Fe and incidental impurities, wherein a sum of Cu content and Ni content is 0.15 mass % or more, and a crystal grain size after forming into a stabilizer shape and quenching is in a range of 7.5 to 10.5 in prior austenite crystal grain size number. Thus, a highly durable stabilizer steel that has a tensile strength of 1200 MPa or more and excellent normal-temperature and low-temperature toughness and is used in an environmentally friendly manufacturing process at lower cost can be realized.

公开(公告)号：US20190030980A1

公开(公告)日：2019-01-31

申请号：US16146269

申请日：2018-09-28

Applicant: NHK SPRING CO., LTD.

Inventor： Akira TANGE ,  Masato SUGAWARA ,  Yutaka WAKABAYASHI

IPC: B60G21/055

Abstract: A terminal sealed portion is formed on an end portion of a hollow rod made of steel. An enclosed space is formed on an inner side of the hollow rod. At an end of the enclosed space, a terminal gap is formed. A volatile powdered rust inhibitor is supplied in the enclosed space. As the volatile powdered rust inhibitor is vaporized, the enclosed space is turned into a rust-inhibiting atmosphere. As the vaporized component of the volatile powdered rust inhibitor is adsorbed to an inner surface of the enclosed space, an inner surface rust-inhibiting film is formed. The vaporized component also enters inside the terminal gap, and forms a terminal rust-inhibiting film.

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：US20170306432A1

公开(公告)日：2017-10-26

申请号：US15520616

申请日：2015-10-26

Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) ,  NHK SPRING CO., LTD.

Inventor： Takuya KOCHI ,  Hitoshi HATANO ,  Akira TANGE ,  Kiyoshi KURIMOTO ,  Yurika GOTO

IPC: C21D9/08 ,  C22C38/06 ,  C22C38/02 ,  C21D6/00 ,  C22C38/00 ,  C22C38/18 ,  C22C38/04

Abstract: A method for manufacturing steel, by quenching and tempering a seamless pipe for use as a material of a hollow spring, where the seamless pipe including predetermined components is subjected to a heat treatment which is performed to satisfy quenching conditions (1) and tempering conditions (2), (1) quenching conditions: 26,000≦(T1+273)×(log(t1)+20)≦29,000  formula (1) 900° C.≦T1≦1,050° C., 10 seconds≦t1≦1,800 seconds, where T1 is a quenching temperature (° C.), and t1 is a holding time (seconds) in a temperature range of 900° C. or higher, and (2) tempering conditions: 13,000≦(T2+273)×(log(t2)+20)≦15,500  formula (2) T2≦550° C., and t2≦3,600 seconds, where T2 is a tempering temperature (° C.), and t2 is a total time (seconds) from start of heating to completion of cooling.

公开(公告)号：US20150343871A1

公开(公告)日：2015-12-03

申请号：US14789779

申请日：2015-07-01

Applicant: NHK SPRING CO., LTD.

Inventor： Akira TANGE ,  Hideki OKADA

IPC: B60G11/14

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 compressive residual stress portion having a compressive residual stress from a surface of a wire to a first depth is formed between end turn portions of a coil spring. The first portion of the end turn portion is always in contact with a spring seat. The second portion contacts the spring seat when the load applied to the coil spring is large, and is separated from the spring seat when the load is small. The third portion is always separated from the spring seat. In the end turn portion, in a region including the second portion, a deep residual stress portion is formed by ultrasonic shot peening. The deep residual stress portion has a compressive residual stress from a surface of the wire to a second depth deeper than the first depth.

Abstract translation: 在螺旋弹簧的端部匝部之间形成有从电线表面到第一深度的压缩残余应力的压缩残余应力部分。 端部转弯部分的第一部分总是与弹簧座接触。 当施加到螺旋弹簧的负载较大时，第二部分接触弹簧座，并且当负载小时与弹簧座分离。 第三部分总是与弹簧座分开。 在末端匝部，在包括第二部分的区域中，通过超声波喷丸硬化形成深残余应力部分。 深残余应力部分具有从线的表面到比第一深度更深的第二深度的压缩残余应力。

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：US20190032190A1

公开(公告)日：2019-01-31

申请号：US16145137

申请日：2018-09-27

Applicant: NHK SPRING CO., LTD.

Inventor： Morimichi KAI ,  Akira TANGE

IPC: C23C8/04 ,  B60G21/055 ,  C21D1/06 ,  C23C8/22 ,  C23C8/02 ,  C23C8/80 ,  C21D9/08

Abstract: A hollow stabilizer production method of a hollow stabilizer used for a vehicle includes attaching a first mounting member and a second mounting member respectively to one end and another end of a formed steel tube and heating the steel tube. The method includes feeding a carburizing gas into the interior space of the heated steel tube through the first mounting member, and collecting the air and/or the surplus carburizing gas from the interior space through the second mounting member to thereby carburize the steel tube inner surface. The method includes rapidly cooling the heated steel tube to thereby quench the steel tube continuously from the carburization.

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.