METHOD OF DRAWING AND DIE FOR DRAWING COMPLEX LARGE-SIZE SHEET BILLET (VERSIONS) Russian patent published in 2011 - IPC B21D22/22 B21D11/02 

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming, particularly, to drawing high-precision parts. Sheet 3D billet, flat or approximately flat, is arranged between two fixed thrusts with hooks and between one or two moving thrusts with hooks arranged opposite said fixed thrusts. Said moving thrusts may move horizontally or inclined to horizon toward fixed thrusts, driven by means of guides and wedges fitted on pressure plate. Said moving thrusts are moved toward fixed thrusts with hooks, moving thrust hooks being used to move one edge of billet to die axis and bend billet into die while opposite edge of said billet is retained by fixed thrust hooks to create combination of billet material before pressing. In further motion of outer slide with pressure plate, pre-bent billet is pressed and, in motion of inner plate, it is expanded.

EFFECT: higher precision, reduced consumption of material an labor input.

5 cl, 7 dwg