Title:
SURFACE-HARDENING TREATMENT DEVICE AND SURFACE-HARDENING TREATMENT METHOD
Document Type and Number:
WIPO Patent Application WO/2019/009408
Kind Code:
A1
Abstract:
In order to bring the nitriding potential in a processing furnace close to the target nitriding potential, the amounts of multiple furnace gases being introduced into the furnace are individually controlled by effecting a change in the ratio of flow rates of the multiple furnace gases being introduced while keeping the total amount of the multiple furnace gases being introduced constant in accordance with a target nitriding potential and a nitriding potential in the processing furnace as calculated by an in-furnace nitriding potential calculation device.
Inventors:
HIRAOKA YASUSHI (JP)
WATANABE YOUICHI (JP)
WATANABE YOUICHI (JP)
Application Number:
PCT/JP2018/025683
Publication Date:
January 10, 2019
Filing Date:
July 06, 2018
Export Citation:
Assignee:
PARKER NETSUSHORI KOGYO CO LTD (JP)
International Classes:
C23C8/26; C21D1/06
Domestic Patent References:
| WO2016054722A1 | 2016-04-14 |
Foreign References:
| JPS63199859A | 1988-08-18 | |||
| JP2016211069A | 2016-12-15 |
Other References:
YASUSHI, HIRAOKA ET AL.: "Effect of Compound Layer Thickness Composed of y'-Fe4N on Rotated-Bending Fatigue Strength in Gas-Ni trided JIS-SCM435 Steel", MATERIALS TRANSACTIONS, vol. 58, no. 7, 25 June 2017 (2017-06-25), pages 993 - 999, XP055562768
YASUSHI HIRAOKAYOICHI WATANABE, HEAT TREATMENT, vol. 55, no. 1, pages 7 - 11
"Nitriding and Nitrocarburizing on Iron Materials", 2013, pages: 158 - 163
DIETER LIEDTKE ET AL., AGUNE TECHNICAL CENTER
Y. HIRAOKAA. ISHIDA: "Effect of Compound Layer Thickness Composed of v'-Fe N on Rotated-Bending Fatigue Strength in Gas-Nitrided JIS-SCM435 Steel", MATERIALS TRANSACTIONS, vol. 58, no. 7, 2017, pages 993 - 999, XP055562768, DOI: 10.2320/matertrans.M2017098
Y. HIRAOKAA. ISHIDA: "Effect of Compound Layer Thickness Composed of '-Fe N on Rotated-Bending Fatigue Strength in Gas-Nitrided JIS-SCM435 Steel", MATERIALS TRANSACTIONS, vol. 58, no. 7, 2017, pages 993 - 999, XP055562768, DOI: 10.2320/matertrans.M2017098
See also references of EP 3650574A4
YASUSHI HIRAOKAYOICHI WATANABE, HEAT TREATMENT, vol. 55, no. 1, pages 7 - 11
"Nitriding and Nitrocarburizing on Iron Materials", 2013, pages: 158 - 163
DIETER LIEDTKE ET AL., AGUNE TECHNICAL CENTER
Y. HIRAOKAA. ISHIDA: "Effect of Compound Layer Thickness Composed of v'-Fe N on Rotated-Bending Fatigue Strength in Gas-Nitrided JIS-SCM435 Steel", MATERIALS TRANSACTIONS, vol. 58, no. 7, 2017, pages 993 - 999, XP055562768, DOI: 10.2320/matertrans.M2017098
Y. HIRAOKAA. ISHIDA: "Effect of Compound Layer Thickness Composed of '-Fe N on Rotated-Bending Fatigue Strength in Gas-Nitrided JIS-SCM435 Steel", MATERIALS TRANSACTIONS, vol. 58, no. 7, 2017, pages 993 - 999, XP055562768, DOI: 10.2320/matertrans.M2017098
See also references of EP 3650574A4
Attorney, Agent or Firm:
TANAKA Shinichiro et al. (JP)
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