Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1985-12-24
1987-06-30
Eley, Timothy V.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
B21K 120, B23P 1904
Patent
active
046759646
ABSTRACT:
A method is disclosed for making a dual microstructure titanium based engine valve, wherein a first zone of the valve contains essentially a mixture of fine, equiaxed alpha and transformed beta crystalline grains which exhibit high tensile strength and high fatigue resistance, and a second zone of the valve which contains essentially a colony type microstructure exhibiting resistance to high temperature creep. The method comprises: (a) preparing a valve stock of forgeable mixed phase alpha/beta titanium based material; (b) hot working said first zone at a temperature below the beta transus temperature, (c) forging said second zone and, either simultaneously with said forging or subsequent thereto, heat treating said second zone at a temperature above (e.g., 25.degree.-200.degree. F. above) the beta transus temperature for a period of time to achieve beta processing followed by cooling to 1400.degree. F. at a rate of 0.1-10.0.degree. F./second; and (d) heat treating, immediately subsequent to either step (b) or step (c), at least the first zone at a temperature below the beta transus temperature (e.g., 25.degree.-200.degree. F. below) for a period of time to achieve alpha/beta processing.
REFERENCES:
patent: 1230140 (1917-06-01), Ellery
patent: 1347542 (1920-07-01), Hilty
patent: 1547125 (1925-07-01), Keller
patent: 2002641 (1935-05-01), McBride
patent: 3536053 (1970-10-01), Vitcha et al.
"Engineering of the Poppet Valve" by Newton, A Symposium On Internal Combustion Engine Valves, Pub. by Thompson Products, Inc., Cleveland, Ohio, 1956, pp. 65-78.
"Forgings in Titanium Alloys", by Scanlon et al, Science Technology and Application of Titanium, Pergamon Press, 1970, pp. 79-95 and 97-110.
"Recent Development in Hot Die Forging of Titanium Alloys", TI-80 Science and Technology, 1980, pp. 2513-2522.
Eley Timothy V.
Ford Motor Company
Malleck Joseph W.
May Roger L.
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