US 4,288,907 AGranted

Method of making billets

OwnerJulian M. Chumanov, Anatoly L. Liberman +11inventors

InventorsJulian M. Chumanov, Anatoly L. Liberman, Vladimir I. Listopad, Vasily V. Polyakov, Vyacheslav F. Gubaidulin, Grigory M. Shulgin, Dmitry P. Evteev, Sergei P. Efimenko, Veniamin V. Fulmakht, Vladimir P. Slednev, Viktor I. Pogorzhelsky, Valentin B. Shum, Anatoly A. Tolpa

Life of this patent

Estimating the term…

patentgrep

Loading patent…

Abstract

A method of making billets, whereby a composite billet is produced by continuous casting or rolling, which billet is star-shaped in cross section and has at least two ray members disposed symmetrically relative to the central longitudinal axis of the composite billet; the base of each star ray member of the composite billet at the place of its juncture with the central portion thereof is selected to be 0.72 to 2.3 of the ray member height, the other base being 0.5 to 1.0 of the ray member height, the lateral sides of the ray member may differ in length; the segregation zone is caused to concentrate in the central portion of the composite billet selecting appropriate relationship between geometric dimensions of the composite billet and by creating favorable conditions for producing the composite billet; thereafter, the ray members are severed from the central portion of the composite billet by means of rolls in a rolling mill, this being performed by subjecting one of the lateral sides of the ray member to the action of an appropriately grooved roll.

Claims10

Dependent claims

A method of making billets, comprising the steps of forming a composite billet having a central portion and at least three ray members disposed symmetrically relative to the central longitudinal axis of said composite billet;

each ray member being partially defined by a pair of opposed bases, a first one of which is situated at the juncture of the ray member with the central portion of said composite billet and a second one of which is situated at the side of the ray member opposite to the first base;
providing that the ray members of said composite billet are free of any zone in which chemical constituents are segregated by forming each ray member with the first base of each ray member at the place of its juncture with the central portion of said composite billet being 0.72 to 2.3 times the height of said ray member, the second base being 0.5 to 1.0 times the height of said ray member so that any such segregation zone is localized in the central portion of said composite billet;
forming stress raisers in the form of indentations at the region of the juncture of respective pairs of adjacent ray members, said indentations having a depth of about 0.07 to 0.2 times the height of the ray member and having a width of about 0.02 to 0.1 times the height of the ray member;
and concurrently severing said ray members of the composite billet from said central portion.

1 more element

Dependencies are inferred from the claim text.