Title:
ブローチ工具寿命を改良する鋼鉄冶金法の最適化
Document Type and Number:
Japanese Patent JP2008511759
Kind Code:
A
Abstract:
A steel for use as a broachable workpiece having a substantially pearlite-free microstructure whereby the service life of the broach tool is maximized. Formation of pearlite is suppressed by alloy modification; on-line processing; off-line processing; or combinations of these techniques which control the microstructure and hardness levels. The workpiece is broached into the form of a powertrain component such as, for example, a gear or race which can be surface hardened after broaching by one of carburizing, nitriding, or induction hardening depending upon the carbon content of the steel. Disclosed are steel compositions and processing methods for making the steel, the broachable workpiece and the broached and surface hardened powertrain article.
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Inventors:
Brunette michael yee
Eve's Jeffrey E
Eve's Jeffrey E
Application Number:
JP2007530350A
Publication Date:
April 17, 2008
Filing Date:
August 30, 2005
Export Citation:
Assignee:
THE TIMKEN COMPANY
International Classes:
C22C38/00; B23D37/00; C21D1/06; C21D1/10; C21D9/32; C21D9/40; C22C38/60
Domestic Patent References:
| JPH07157842A | 1995-06-20 | |||
| JPH02153018A | 1990-06-12 | |||
| JP2005281857A | 2005-10-13 | |||
| JP2000282172A | 2000-10-10 | |||
| JP2001214241A | 2001-08-07 |
Foreign References:
| WO1994020645A1 | 1994-09-15 | |||
| US3258372A | 1966-06-28 |
Attorney, Agent or Firm:
Shunichiro Suzuki
Koji Makimura
Yoshiko Yamoto
Koji Makimura
Yoshiko Yamoto