METHOD OF FORMING ULTRA-FINE-GRAINED STRUCTURE IN BILLETS FROM METAL AND ALLOYS

摘要

FIELD: process engineering. ^ SUBSTANCE: invention relates to metal forming and may be used in machine building, engine production, automotive industry, etc. Proposed method comprises multiple reiteration of upsetting-broaching operations on applying deforming force along three axes of orthogonal coordinate system of the workpiece at a time. Billet is broached to square and upset in die. Die has cylindrical cavity with axis of symmetry aligned with deforming force direction. Forming is executed in several cycles to reach accumulated deformation e>2 so that square diagonal does not exceed die cavity diameter after broaching. Tapered recesses are formed on end surfaces of workpiece being upset. ^ EFFECT: higher quality and efficiency. ^ 4 dwg, 1 ex