Title:
METHOD AND APPARATUS FOR INDUCTION-HARDENING COIL SPRING
Document Type and Number:
Japanese Patent JP2008115468
Kind Code:
A
Abstract:
To improve a method and an apparatus for hardening a coil spring, particularly a valve spring, by induction-heating and then rapidly cooling it.
The coil springs are positionally-fixed individually, driven revolvably and guided through an electromagnetic alternating magnetic field. The coil springs are provided with non-magnetic individual holders (29). The holders (29) are revolvably driven and are able to continuously pass through the electromagnetic alternating magnetic field of an inductor assembly.
Inventors:
HUFNAGEL THORSTEN
BONSE RUDOLF
BONSE RUDOLF
Application Number:
JP2007283162A
Publication Date:
May 22, 2008
Filing Date:
October 31, 2007
Export Citation:
Assignee:
MUHR & BENDER KG
International Classes:
C21D9/02; C21D1/10; F16F1/06
Attorney, Agent or Firm:
Toshio Yano
Toshiomi Yamazaki
Takuya Kuno
Hiroshi Sugimoto
Kimihiro Hoshi
Hiroyasu Ninomiya
Einzel Felix-Reinhard
Reinhard Einsel
Toshiomi Yamazaki
Takuya Kuno
Hiroshi Sugimoto
Kimihiro Hoshi
Hiroyasu Ninomiya
Einzel Felix-Reinhard
Reinhard Einsel