公开(公告)号：EP2599566B1

公开(公告)日：2017-12-20

申请号：EP11812598.8

申请日：2011-07-28

Applicant: NHK Spring Co., Ltd.

Inventor： KATSUYAMA, Akira ,  MORISHIMA, Takayuki ,  YAJIMA, Takashi ,  MORI, Yuji ,  NUKUI, Kotaro

IPC: B21F3/02 ,  B21F35/00 ,  F16F1/06

CPC classification number: B21F3/02 ,  B21F35/00

Abstract: A coil wire material (30) is bent by a first roll (32), a second roll (34), and a third roll (36). The bent coil wire material (30) is pressed in a screwing direction, to shape a coil spring having a desired diameter and a pitch. A desired pitch can be accurately formed in a manner that a second roll (34) provided on a downstream side of a conveying direction of the coil wire material (30) is configured to be able to move back and forth along the screwing direction of the coil spring and to be tiltable about an axis of rotation parallel to the conveying direction of the coil wire material (30).

公开(公告)号：EP2647867B1

公开(公告)日：2017-01-11

申请号：EP11844264.9

申请日：2011-11-24

Applicant: NHK Spring Co., Ltd.

Inventor： YAJIMA, Takashi ,  KATSUYAMA, Akira

IPC: F16F1/02 ,  B24C1/04 ,  B24C1/10 ,  B24C3/02 ,  B24C3/32 ,  B24C9/00 ,  F16F1/06

CPC classification number: B24C1/00 ,  B24C1/10 ,  B24C3/327 ,  F16F1/00

公开(公告)号：EP2599566A1

公开(公告)日：2013-06-05

申请号：EP11812598.8

申请日：2011-07-28

Applicant: NHK Spring Co., Ltd.

Inventor： KATSUYAMA, Akira ,  MORISHIMA, Takayuki ,  YAJIMA, Takashi ,  MORI, Yuji ,  NUKUI, Kotaro

IPC: B21F3/02 ,  B21F35/00 ,  F16F1/06

CPC classification number: B21F3/02 ,  B21F35/00

Abstract: A coil wire material (30) is bent by a first roll (32), a second roll (34), and a third roll (36). The bent coil wire material (30) is pressed in a screwing direction, to shape a coil spring having a desired diameter and a pitch. A desired pitch can be accurately formed in a manner that a second roll (34) provided on a downstream side of a conveying direction of the coil wire material (30) is configured to be able to move back and forth along the screwing direction of the coil spring and to be tiltable about an axis of rotation parallel to the conveying direction of the coil wire material (30).

Abstract translation: 线圈线材（30）由第一辊（32），第二辊（34）和第三辊（36）弯曲。 弯曲的线圈线材（30）以螺纹方向被按压，以形成具有所需直径和间距的螺旋弹簧。 期望的间距可以以使得设置在线圈线材（30）的输送方向的下游侧的第二辊（34）被构造成能够沿着线圈线材的旋转方向前后移动的方式被精确地形成 并且能够绕平行于线圈线材（30）的输送方向的旋转轴线倾斜。

公开(公告)号：EP2647867A1

公开(公告)日：2013-10-09

申请号：EP11844264.9

申请日：2011-11-24

Applicant: Nhk Spring Co., Ltd.

Inventor： YAJIMA, Takashi ,  KATSUYAMA, Akira

IPC: F16F1/02 ,  B24C1/04 ,  B24C1/10 ,  B24C3/02 ,  B24C3/32 ,  B24C9/00 ,  F16F1/06

CPC classification number: B24C1/00 ,  B24C1/10 ,  B24C3/327 ,  F16F1/00

Abstract: A hollow spring and a production method therefor, which can improve the durability and the efficiency of inner surface abrasive blasting for spring material, are provided.
A straight-shaped hollow spring material W is used in a blasting apparatus 100. The length of the spring material W is set to be 1.5 m to 3.5 m, and the inner diameter of the spring material W is set to be not more than 10 mmϕ (not including 0). In inner surface abrasive blasting for the spring material W, first blasting and second blasting are performed in turn. In the first blasting, abrasives are ejected to an opening portion Wa of the spring material W and are suctioned from an opening portion Wb thereof. In the second blasting, the abrasives are ejected to the opening portion Wb of the spring material W and are suctioned from the opening portion Wa thereof. Thus, the inner surface of the spring material W can be prevented from having a trumpet shape. The ejection pressure, the suction pressure, and the like are appropriately set, so that generation of grinding amount difference between the center portion and both end portions of the inner surface of the spring material W can be inhibited.