US 5,850,755 AGranted

Method and apparatus for intensive plastic deformation of flat billets

OwnerVladimir M. Segalinventor

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Abstract

Methods and apparatus are described for the plastic deformation of flat rectangular billets. Simultaneous extrusion of two flat rectangular billets through a die having channels of equal cross-sectional area alters billet material structure, texture, and physicomechanical properties without altering billet dimensions. The extrusion system of the present invention prolongs die lifetime, increases punch stability, decreases punch working load and pressure requirements, eliminates the difficulties associated with lubricating movable parts of the die under high pressure and temperature, optimizes use of press space, and provides for automatic and independent ejection of extruded billets from the die. The methods of plastic deformation processing of flat rectangular billets in the present invention allow for the production of a variety of structural, textural, and physicomechanical properties previously unobtainable for large flat rectangular billets.

A method of intensive plastic deformation of flat billets having large ratios of billet dimensions along longitudinal axes to a billet thickness, comprising the steps of inserting a billet into a vertical channel whose length corresponds to a billet dimension along a first longitudinal axis while a width corresponds to a billet dimension along a second longitudinal axis, and a thickness corresponds to a billet thickness;

extruding the billet along the first longitudinal axis from the vertical channel into a horizontal channel which is contiguous with and oriented at an angle to the vertical channel;
ejecting of the billet along an axis of horizontal channel after completing the extruding;
repeating the steps of inserting, extruding and ejecting of the billet along the first longitudinal axis;
rotating the billet 90 degrees about a perpendicular axis to a fixed flat surface of the billet;
inserting the billet into an another vertical channel whose length corresponds to the billet dimension along the second longitudinal axis while a width corresponds to the billet dimension along the first longitudinal axis, and a thickness corresponds to the billet thickness;
extruding the billet along the second longitudinal axis from the another vertical channel into a corresponding another horizontal channel having the same cross-section, and being contiguous with and oriented at an angle to the another vertical channel;
ejecting of the billet along an axis of the another horizontal channel after completing the extruding;
repeating the steps of inserting, extruding and ejecting of the billet along the second longitudinal axis;
rotating the billet 90 degrees in the direction opposed to the first-mentioned rotating about the perpendicular axis to the fixed flat surface of the billet;
performing a number of the extruding steps along the first and second longitudinal axis of the billet in any sequence in accordance with equations:
##EQU3## where N is an established total number of extruding steps;
N.sub.1 is a number of extruding steps along the first longitudinal axis;
N.sub.2 is a number of extruding steps along the second longitudinal axis;
.phi. is an angle between the first longitudinal axis and a direction of anisotropy at the billet flat surface.

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Abstract

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