公开(公告)号：US20150252863A1

公开(公告)日：2015-09-10

申请号：US14427106

申请日：2013-09-05

Applicant: NHK SPRING CO., LTD.

Inventor： Yuitirou Ono ,  Tohru Shiraishi ,  Yoshiki Ono ,  Keita Takahashi

IPC: F16F1/02 ,  C21D9/02 ,  C21D6/00 ,  C22C38/46 ,  C22C38/34 ,  C22C38/24 ,  C22C38/22 ,  C22C38/04 ,  C22C38/02 ,  C23C8/22 ,  C23C8/02 ,  C23C8/80 ,  B24C1/10 ,  B21F3/02 ,  B21F35/00 ,  F16F1/06 ,  C21D8/06

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: 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 min from surface of the wire material is not less than 200 MPa and not less than 60 MPa, respectively.

Abstract translation: 螺旋弹簧包括含有C：0.45〜0.80重量％，Si：0.15〜2.50重量％，Mn：0.3〜1.0重量％，余量不可避免的杂质的钢丝材料，圆当量直径为2.5毫米 10mm，其中线材自由选择的截面的内部硬度在570〜700Hv的范围内，超过钢丝材料中含有的C的平均浓度的C缩合层存在于表层部， 当在线材的螺旋弹簧的内径侧的弹簧上施加压缩载荷时产生的近似最大主应力方向，在线材表面的距离为0.2mm和0.4min的深度处的无载荷的压缩残余应力不是 分别小于200MPa且不小于60MPa。

公开(公告)号：US09752636B2

公开(公告)日：2017-09-05

申请号：US14427106

申请日：2013-09-05

Applicant: NHK SPRING CO., LTD.

Inventor： Yuitirou Ono ,  Tohru Shiraishi ,  Yoshiki Ono ,  Keita Takahashi

IPC: F16F1/02 ,  B21F3/02 ,  B21F35/00 ,  C21D7/06 ,  C21D9/02 ,  C23C8/22 ,  C23C8/80 ,  C21D1/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/08 ,  C22C38/12 ,  C22C38/18 ,  B24C1/10 ,  C21D6/00 ,  C21D8/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/34 ,  C22C38/46 ,  C23C8/02 ,  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: 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 min from surface of the wire material is not less than 200 MPa and not less than 60 MPa, respectively.