公开(公告)号：EP3611286A1

公开(公告)日：2020-02-19

申请号：EP18784444.4

申请日：2018-04-10

Applicant: NHK Spring Co., Ltd.

Inventor： AKANUMA, Toshiyuki ,  SHIRAISHI, Tohru ,  IWAGAKI, Yohei ,  TAKAHASHI, Keita ,  HIRAI, Shun

IPC: C22C38/00 ,  C21D1/06 ,  C21D7/06 ,  C21D9/02 ,  C22C38/46 ,  F16F1/06 ,  C22C38/54

Abstract: A C-condensed layer is formed on the surface of a wire material at a uniform thickness and in a narrow range, and appropriate compression residual stress distribution is imparted to the wire material after it is formed, so that a compression coil spring of high durability and with sag resistance can be provided. The compression coil spring includes a steel wire material containing, hereinafter in weight%, 0.5 to 0.7 % of C, 1.2 to 3.0 % of Si, 0.3 to 1.2 % of Mn, 0.5 to 1.9 % of Cr and 0.05 to 0.5 % of V as necessary components, one or more kinds selected from not more than 1.5 % of Ni, not more than 1.5 % of Mo and not more than 0.5 % of W as freely selected components, and iron and inevitable impurities as the remainder; the C-condensed layer which exceeds the average concentration of C contained in the steel wire material exists at a surface layer part, and the thickness of the C-condensed layer is within 0.01 to 0.05 mm along the entire circumference of the steel wire material.

公开(公告)号：EP2896712A1

公开(公告)日：2015-07-22

申请号：EP13837663.7

申请日：2013-09-05

Applicant: Nhk Spring Co., Ltd.

Inventor： ONO, Yuitirou ,  SHIRAISHI, Tohru ,  ONO, Yoshiki ,  TAKAHASHI, Keita

IPC: C22C38/00 ,  B21F3/02 ,  B21F35/00 ,  B24C1/10 ,  B24C11/00 ,  C21D1/06 ,  C21D7/06 ,  C21D8/06 ,  C21D9/02 ,  C22C38/04 ,  C22C38/54 ,  C23C8/22 ,  C23C8/80 ,  F16F1/06

CPC classification number: F16F1/021 ,  B21F3/02 ,  B21F35/00 ,  B24C1/10 ,  C21D1/06 ,  C21D6/002 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D7/06 ,  C21D8/065 ,  C21D9/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/18 ,  C22C38/22 ,  C22C38/24 ,  C22C38/34 ,  C22C38/46 ,  C23C8/02 ,  C23C8/22 ,  C23C8/80 ,  F16F1/06 ,  F16F2224/0216 ,  F16F2226/00 ,  F16F2236/04 ,  F16F2238/026

Abstract: Tensile residual stress due to coiling processing is solved and appropriate compressive residual stress distribution is imparted by forming C-condensed layer at the wire material surface, so that compression coil spring having high durability is produced by using inexpensive wire material in the method for production of the present invention. The coil spring includes steel wire material containing 0.45 to 0.80 weight% of C, 0.15 to 2.50 weight% of Si, 0.3 to 1.0 weight% of Mn and iron and inevitable impurities as the remainder, and having a circle equivalent diameter of 2.5 mm to 10 mm, in which internal hardness at a freely selected cross section of the wire material is in a range of 570 to 700 Hv, C-condensed layer which exceeds average concentration of C contained in the steel wire material exists at surface layer part, and in an approximate maximum principal stress direction generated when a compressive load is loaded on spring of inner diameter side of the coil spring of the wire material, unloaded compressive residual stress at a depth of 0.2 mm and 0.4 mm from surface of the wire material is not less than 200 MPa and not less than 60 MPa, respectively.

公开(公告)号：EP2896712B1

公开(公告)日：2019-08-07

申请号：EP13837663.7

申请日：2013-09-05

Applicant: NHK Spring Co., Ltd.

Inventor： ONO, Yuitirou ,  SHIRAISHI, Tohru ,  ONO, Yoshiki ,  TAKAHASHI, Keita

IPC: B21F3/02 ,  B24C1/10 ,  C23C8/02 ,  C22C38/02 ,  C21D9/02 ,  C22C38/04 ,  C22C38/54 ,  C23C8/22 ,  C23C8/80 ,  F16F1/06 ,  C22C38/08 ,  C22C38/12 ,  C21D7/06 ,  C21D8/06 ,  C21D1/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/18 ,  F16F1/02

公开(公告)号：EP3059025A1

公开(公告)日：2016-08-24

申请号：EP14854805.0

申请日：2014-10-08

Applicant: NHK Spring Co., Ltd.

Inventor： TAKAHASHI, Keita ,  SHIRAISHI, Tohru ,  ONO, Yuichiro ,  NAGASAWA, Kaoru

IPC: B21F35/00 ,  B21F11/00 ,  B21F23/00

CPC classification number: B21F35/00 ,  B21F3/06 ,  B21F11/005 ,  B21F23/00 ,  B21F99/00 ,  H05B6/101

Abstract: A spring forming device in which the steel wire can be continuously cut off without stopping the feeding of the steel wire in cutting, and in which the steel wire can be uniformly heated, is provided. The spring forming device has a wire supplying mechanism for supplying a steel wire using a plurality of feeding rollers, a heating mechanism for heating the steel wire, a coiling mechanism for forming in a coil state the heated steel wire, and a cutting mechanism for cutting the steel wire coiled at a given number of turns off the steel wire remained backward. A cutting blade of the cutting mechanism follows tracks having a speed Va that moves to the receiving blade and a speed Vc that moves in an axial direction of the coiled steel wire, in cutting of the steel wire.

Abstract translation: 提供一种弹簧形成装置，其中钢丝可以连续切断而不停止钢丝在切割中的进给，并且其中钢丝可以被均匀地加热。 弹簧形成装置具有用于使用多个进给辊供给钢丝的供线机构，用于加热钢丝的加热机构，用于在线圈状态形成加热的钢丝的卷取机构以及用于切割的切割机构 以一定数量的关闭钢丝卷绕的钢丝丝线向后退。 在切割钢丝时，切割机构的切割刀片跟随具有移动到接收刀片的速度Va的轨道和沿着线圈钢丝的轴向方向移动的速度Vc。