公开(公告)号：US20190113094A1

公开(公告)日：2019-04-18

申请号：US16088665

申请日：2017-03-30

Applicant: NHK SPRING Co., Ltd.

Inventor： Toshinori WATANABE ,  Hidemasa ITO ,  Noritoshi TAKAMURA ,  Fumio YAMAMOTO ,  Fumio TAKAHASHI

IPC: F16F1/04 ,  F16F1/06

Abstract: The present invention provides a coil spring, in which a corresponding portion is provided at an end portion in a direction of a coil axis, the corresponding portion having a whole size in the direction of the coil axis of the plurality of wire materials adjacent to each other in the direction of the coil axis equal to a maximum value of a gap in the direction of the coil axis between wire materials adjacent to each other in the direction of the coil axis of the coil spring, a gap in the direction of the coil axis between the corresponding portion and a wire material adjacent to the corresponding portion on an inner side in the direction of the coil axis is smaller than a wire height in an active coil portion of the coil spring, and at the end portion of the direction of the coil axis, a gap in the direction of the coil axis between a portion extending around the coil axis from the corresponding portion to a distal end portion side of the wire material and a wire material adjacent to the portion on the inner side in the direction of the coil axis gradually decreases from the corresponding portion toward the distal end portion side of the wire material around the coil axis.

公开(公告)号：US20170001226A1

公开(公告)日：2017-01-05

申请号：US15268268

申请日：2016-09-16

Applicant: SHINKO METAL PRODUCTS CO., LTD. ,  NHK Spring Co., Ltd.

Inventor： Kotaro TOYOTAKE ,  Koji IWATA ,  Tomoyuki MINAMI ,  Noritoshi TAKAMURA

IPC: B21B19/04 ,  B21C23/00 ,  B21C23/08 ,  B21B1/42

CPC classification number: B21B19/04 ,  B21B1/42 ,  B21C23/007 ,  B21C23/08 ,  B21C23/085 ,  B21F3/02 ,  C21D9/08 ,  C22C38/04 ,  C22C38/34 ,  C22C38/46 ,  F16F1/04 ,  F16F1/042 ,  F16F1/06 ,  F16F1/18

Abstract: There are provided: a seamless steel pipe formed from a cylindrical steel material billet through a hot isostatic extrusion step, wherein a depth of a contiguous flaw formed on an inner periphery surface and an outer periphery surface of the steel pipe is 50 μm or less; a hollow spring obtained by forming a hollow body in a shape of a coil or a bar or a bar with curved part from the seamless steel pipe made of spring steel and applying a surface treatment to the hollow body so that the hollow body has compressive residual stress; and a method for producing seamless steel pipe including: a billet molding step; a first heating step; a hot isostatic extrusion step; a second heating step; an extension step; a third heating step; and a pickling step.

Abstract translation: 提供了一种通过热等静压挤出步骤由圆柱形钢材坯料形成的无缝钢管，其中形成在钢管的内周面和外周面上的相邻缺口的深度为50μm以下; 通过从由弹簧钢制成的无缝钢管形成具有弯曲部的线圈或棒或棒的中空体的空心弹簧，并对中空体进行表面处理，使得中空体具有压缩残余 强调; 以及生产无缝钢管的方法，包括：坯料成型步骤; 第一加热步骤; 热等静压挤压步骤; 第二加热步骤; 延伸步骤 第三加热步骤; 和酸洗步骤。

公开(公告)号：US20140346721A1

公开(公告)日：2014-11-27

申请号：US14453747

申请日：2014-08-07

Applicant: Shinko Metal Products Co., Ltd. ,  NHK Spring Co., Ltd.

Inventor： Kotaro TOYOTAKE ,  Koji IWAYA ,  Tomoyuki MINAMI ,  Noritoshi TAKAMURA

IPC: F16F1/04 ,  F16F1/18 ,  F16F1/06

CPC classification number: B21B19/04 ,  B21B1/42 ,  B21C23/007 ,  B21C23/08 ,  B21C23/085 ,  B21F3/02 ,  C21D9/08 ,  C22C38/04 ,  C22C38/34 ,  C22C38/46 ,  F16F1/04 ,  F16F1/042 ,  F16F1/06 ,  F16F1/18

Abstract: There are provided: a seamless steel pipe formed from a cylindrical steel material billet through a hot isostatic extrusion step, wherein a depth of a contiguous flaw formed on an inner periphery surface and an outer periphery surface of the steel pipe is 50 nm or less; a hollow spring obtained by forming a hollow body in a shape of a coil or a bar or a bar with curved part from the seamless steel pipe made of spring steel and applying a surface treatment to the hollow body so that the hollow body has compressive residual stress; and a method for producing seamless steel pipe including: a billet molding step; a first heating step; a hot isostatic extrusion step; a second heating step; an extension step; a third heating step; and a pickling step.

Abstract translation: 提供了一种通过热等静压挤出步骤由圆柱形钢材坯料形成的无缝钢管，其中形成在钢管的内周面和外周面上的连续缺口的深度为50nm以下; 通过从由弹簧钢制成的无缝钢管形成具有弯曲部的线圈或棒或棒的中空体的空心弹簧，并对中空体进行表面处理，使得中空体具有压缩残余 强调; 以及生产无缝钢管的方法，包括：坯料成型步骤; 第一加热步骤; 热等静压挤压步骤; 第二加热步骤; 延伸步骤 第三加热步骤; 和酸洗步骤。