Title:
METHOD FOR MANUFACTURING SPRING AND DEVICE FOR HEATING BY PASSAGE OF ELECTRIC CURRENT
Document Type and Number:
WIPO Patent Application WO/2012/014672
Kind Code:
A1
Abstract:
A method for manufacturing a spring, wherein the time required for a heating treatment step for removing a processing strain produced by a forming step is reduced. This manufacturing method comprises a forming step (S10) for forming spring steel into a spring shape, and a heating treatment step (S12) for removing a processing strain produced in the spring steel by the forming step. The heating treatment step is performed by heating by the passage of an electric current, wherein the spring steel is heated by passing the electric current through the spring steel. The heat treatment step has a first step for heating the spring steel to a preset set temperature, and a second step for maintaining the spring steel at the set temperature for a preset set time after the first step. The set temperature is set higher than 430°C and not higher than 500°C.
Inventors:
HIRATA Yuichi (68 Aza Kamishiota, Narumi-cho, Midori-ku, Nagoya-sh, Aichi 05, 〒4588505, JP)
平田 雄一 (〒05 愛知県名古屋市緑区鳴海町字上汐田６８番地 中央発條株式会社内 Aichi, 〒4588505, JP)
SUZUKI Hidekazu (68 Aza Kamishiota, Narumi-cho, Midori-ku, Nagoya-sh, Aichi 05, 〒4588505, JP)
平田 雄一 (〒05 愛知県名古屋市緑区鳴海町字上汐田６８番地 中央発條株式会社内 Aichi, 〒4588505, JP)
SUZUKI Hidekazu (68 Aza Kamishiota, Narumi-cho, Midori-ku, Nagoya-sh, Aichi 05, 〒4588505, JP)
Application Number:
JP2011/065886
Publication Date:
February 02, 2012
Filing Date:
July 12, 2011
Export Citation:
Assignee:
CHUO HATSUJO KABUSHIKI KAISHA (68 Aza Kamishiota, Narumi-cho Midori-ku, Nagoya-sh, Aichi 05, 〒4588505, JP)
中央発條株式会社 (〒05 愛知県名古屋市緑区鳴海町字上汐田６８番地 Aichi, 〒4588505, JP)
HIRATA Yuichi (68 Aza Kamishiota, Narumi-cho, Midori-ku, Nagoya-sh, Aichi 05, 〒4588505, JP)
平田 雄一 (〒05 愛知県名古屋市緑区鳴海町字上汐田６８番地 中央発條株式会社内 Aichi, 〒4588505, JP)
中央発條株式会社 (〒05 愛知県名古屋市緑区鳴海町字上汐田６８番地 Aichi, 〒4588505, JP)
HIRATA Yuichi (68 Aza Kamishiota, Narumi-cho, Midori-ku, Nagoya-sh, Aichi 05, 〒4588505, JP)
平田 雄一 (〒05 愛知県名古屋市緑区鳴海町字上汐田６８番地 中央発條株式会社内 Aichi, 〒4588505, JP)
International Classes:
C21D9/02; B21F35/00; C21D1/40; F16F1/02
Attorney, Agent or Firm:
KAI-U PATENT LAW FIRM (NISSEKI MEIEKI BUILDING 7F, 45-14 Meieki 2-chome, Nakamura-ku, Nagoya-sh, Aichi 02, 〒4500002, JP)
Claims:
Previous Patent: NEUTRON RAY IRRADIATION DEVICE, AND METHOD FOR CONTROL OF NEUTRON RAY IRRADIATION DEVICE
Next Patent: INSPECTION JIG AND CONTACT
Next Patent: INSPECTION JIG AND CONTACT