发明名称 |
METHOD AND APPARATUS FOR STRENGTHENING OF POWDER METAL GEARS BY AUSFORMING |
摘要 |
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. |
申请公布号 |
WO2004082872(A2) |
申请公布日期 |
2004.09.30 |
申请号 |
WO2004US08199 |
申请日期 |
2004.03.17 |
申请人 |
THE PENN STATE RESEARCH FOUNDATION |
发明人 |
SONTI, NAGESH;AMATEAU, MAURICE, F.;RAO, SUREN, B. |
分类号 |
B21H5/02;B22F3/16;B22F3/24;B22F5/08;C21D1/19;C21D1/42;C21D8/00;C21D9/32 |
主分类号 |
B21H5/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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