SIZED FORGED PIECES PRODUCING METHOD AND TOOL FOR PERFORMING THE SAME Russian patent published in 2007 - IPC B21J1/04 B21J13/02 

FIELD: plastic working of metals, namely manufacture of round cross section forged pieces from ingots and preliminarily deformed blanks in forging presses with four-striker forging devices.

SUBSTANCE: method comprises steps of hating ingot or blank and subjecting it to rough or sizing forging in four-striker forging device by the same strikers with concave curvilinear surfaces. When strikers are closed their concave surfaces form cylindrical cavity with relation of radius of concave curvilinear surface to circle radius inscribed into cavity formed by closed strikers in range 1.15 - 2.10. At rough forging process blank is subjected to single squeezing stages at deformation degree 18 - 70% while sustaining relation d₁/d₂ = 1.4 - 2.7 where d1 - mean diameter of ingot or blank; d₂ - diameter of circle inscribed to cavity formed by closed strikers. At sizing forging process relation d₃/d₄ = 1.02 - 1.15 is sustained where d₃ - diameter of blank after rough forging of it; d₄ - diameter of sized forged piece.

EFFECT: reduced labor consumption of forging process, enhanced efficiency, less expenses for making tool.

3 cl, 4 dwg, 2 tbl