Title:
オースフォーミングによって粉末金属製歯車を強靭にする方法および装置
Document Type and Number:
Japanese Patent JP2006523775
Kind Code:
A
Abstract:
A technique for net shaping gear teeth of a high performance power transmission gear from a powder metal workpiece includes heating a powder metal workpiece in the form of a near net shaped gear blank having gear teeth surfaces above its critical temperature to obtain an austenitic structure throughout its surfaces, isothermally quenching the workpiece at a rate greater than the critical cooling rate of its surfaces to a uniform metastable austenitic temperature just above the martensitic transformation temperature, rolling the gear teeth surfaces of the workpiece to a desired outer peripheral profiled shape between opposed dies, each die having an outer peripheral profiled surface, while holding the workpiece at the uniform metastable austenitic temperature, the gear teeth surfaces undergoing densification, plastic deformation, and strengthening as a result of the rolling operation, and cooling the workpiece through the martensitic range to thereby harden the surfaces of the gear teeth.
Inventors:
Sonty Nagesh
Amattoo Maurice F.
Lao Suren Bee.
Amattoo Maurice F.
Lao Suren Bee.
Application Number:
JP2006507289A
Publication Date:
October 19, 2006
Filing Date:
March 17, 2004
Export Citation:
Assignee:
THE PENN STATE RESEARCH FOUNDATION
International Classes:
C21D9/32; B21H5/02; B22F3/16; B22F3/24; B22F5/08; C21D8/00; C22C38/00; C21D1/19; C21D1/42; F16H55/06
Domestic Patent References:
| JPH0972402A | 1997-03-18 | |||
| JPS6383223A | 1988-04-13 | |||
| JPS6227516A | 1987-02-05 |
Foreign References:
| US6264768B1 | 2001-07-24 |
Attorney, Agent or Firm:
Motohiko Fujimura