Spring forming device and forming method therefor

Patent metadata

Field	Value
Publication number	US-2016243607-A1
Application number	US-201415027393-A
Country	US
Kind code	A1
Filing date	Oct 8, 2014
Priority date	Oct 18, 2013
Publication date	Aug 25, 2016
Grant date	—

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.

First claim

1 . A spring forming device comprising:
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 coiled 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, wherein the coiling mechanism comprises:
a wire guide for inducing the steel wire supplied by the feeding rollers to an appropriate position in a processing portion,
a coiling tool for processing the steel wire supplied through the wire guide to a coiled shape, and
a pitching tool for forming pitches on the steel wire in a coiled shape, the cutting mechanism comprises:
a cutting blade for cutting the steel wire coiled at a given number of turns off the steel wire remained backward, and
a receiving blade for supporting the steel wire arranged opposite to the cutting blade,
a region for heating the steel wire in the heating mechanism is arranged between the feeding rollers and the wire guide, and the cutting blade 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.

2 . The spring forming device according to claim 1 , wherein a space distance between the feeding roller and the receiving blade is 200 to 500 mm.

3 . The spring forming device according to claim 1 , wherein the heating mechanism uses high frequency heating, and a coil length of a heating coil coaxially arranged with the steel wire is 100 to 350 mm.

4 . The spring forming device according to claim 1 , wherein feeding speed of the steel wire when the steel wire is cut off by the cutting blade is 50 to 100% of feeding speed of the steel wire other than in cutting.

5 . The spring forming device according to claim 4 , wherein the feeding speed of the steel wire when the steel wire is cut off by the cutting blade is 90 to 100% of the feeding speed of the steel wire other than in cutting.

6 . The spring forming device according to claim 1 , wherein in the case in which feeding speed of the steel wire when the steel wire is cut off by the cutting blade is set to be Vw, the relationship Vc>Vw is satisfied.

7 . The spring forming device according to claim 1 , wherein in the case in which feeding speed of the steel wire when the steel wire is cut off by the cutting blade is set to be Vw, the relationship 2.5>Vc/Vw>1.1 is satisfied.

8 . A method for forming spring, comprising
a heating step for heating a steel wire while feeding the steel wire, a coiling step for coiling the heated steel wire in a coiled shape, and a cutting step for cutting the steel wire coiled at a given number of turns off the steel wire remained backward, wherein the cutting step is carried out by a receiving blade and a cutting blade which closes and separates to the receiving blade, and the cutting blade 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 coiled steel wire.

Assignees

• Nhk Spring Co Ltd

Inventors

• Takahashi Keita
• Shiraishi Tohru
• Ono Yuichiro
• Nagasawa Kaoru

Classifications

• B21F35/00 Primary

  Making springs from wire · CPC title

• B21F11/005

  springs · CPC title

• B21F3/06

  internally on a hollow form · CPC title

• B21F99/00

  Subject matter not provided for in other groups of this subclass · CPC title

• B21F23/00

  Feeding wire in wire-working machines or apparatus · CPC title