Alloys or metallic compositions – Ferrous – One percent or more carbon containing – but less than 1.7...
Patent
1984-06-04
1989-06-27
Zimmerman, John J.
Alloys or metallic compositions
Ferrous
One percent or more carbon containing, but less than 1.7...
420104, 420127, C22C 3826, C22C 3834
Patent
active
048428183
ABSTRACT:
Method for manufacturing a tapered rod for a coil spring from a metallic material of mainly steel in a linear state, by imparting heating to the same with a predetermined temperature gradient pattern in the axial direction thereof while or before pulling by tensile force the metallic material chucked at two axially distant points in either direction in a gradually decreasing or stepwise decreasing speed, until a desired tapered portion is formed. An apparatus preferably employed for this method comprises a pulling mechanism for chucking and pulling the material, an electric current supplying mechanism for supplying predetermined amount of current to the material between the two chucked points, a plurality of cooling units arranged axially along the material for positionwise cooling the material so as to make the temperature gradient thereon, a temperature detecting device for detecting the surface temperature of the material for feeding back the detected data to the current supplying mechanism, and a heating temperature controlling device for controlling the amount of the current flowed there.
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patent: 2502005 (1950-03-01), Hansell
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patent: 4007616 (1977-02-01), Aleck
"Spring Designers Handbook", Carlson, Harold, Marcel Dekker, Inc., 1978, pp. 27-57.
"Spring Design-a Practical Treatment", W. R. Berry, Emmott & Company Limited, 1961, p. 41.
"Handbook of Mechanical Spring Design", Associated Spring Corporation, 1952, pp. 6-9.
"Mechanical Springs", Wahl, A. M., 2nd ed., McGraw-Hill Book Co., Inc., N.Y., 1963, pp. 19-29.
"Spring Manufacturing Handbook", Carlson, Harold, Marcel Dekker Inc., N.Y., 1982, pp. 52-53.
Abeyama Shozo
Kato Tetsuo
Saito Makoto
Daido Tokushuko Kabushiki Kaisha
Zimmerman John J.
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