Extrusion press and method

Details Extrusion press and method Extrusion press and method

1980-12-22

1982-08-31

Larson, Lowell A.

Metal deforming

By extruding through orifice

Pressure or velocity conditioning

722531, 72455, B21C 2321

Patent

active

043465781

ABSTRACT:
Known extrusion presses create elastic oscillations that result in chatter cracking when the metal being extruded is a high strain rate sensitive material. This invention removes that problem by placing the tie rods of the press in an initial pre-tension of a magnitude greater than the maximum tie rod stress that will be caused by the flow of metal through the extrusion die, and holding the thrust of the pre-tension by cast iron columns of such cross sectional area that the linear compression of the columns due to the thrust of that pre-tension is negligible.

REFERENCES:
patent: 1251430 (1917-12-01), Sherman
patent: 1636057 (1927-07-01), Jones
patent: 1974148 (1934-09-01), Byerlein
patent: 2675125 (1954-04-01), Genders
patent: 3019144 (1962-01-01), Murphy et al.
patent: 3216233 (1965-11-01), Pischel
patent: 3919878 (1975-11-01), Groos
patent: 4240342 (1980-12-01), Delmer

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