METHOD OF METAL FORMING Russian patent published in 2011 - IPC B21J5/06 B21C23/00 C22F1/00 C21D7/00 B82B3/00 

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming with high-intensity plastic deformation and serves to produce nanocrystalline structure of materials with higher mechanical properties. Moulding is carried using die made up of two half-dies. Each half-die has one parallel channel and one intermediate channel. Intermediate semi-channel and semi-channel of another half die make common intermediate channel. At first moulding stage, prior to placing billet into die, half-dies are transferred unless axes of parallel channels are located on one straight line and they form common channel. Then, billet is place into said channel. Axial strain forces are applied simultaneously with lateral strain forces to both faces of the billet, and moving half-does are moved into initial position. Center of plastic deformation originates at biller medium part, and gets divided into two centers to be displaced toward billet ends. At second moulding stage, axial straining loads are removed to displace moving half-dies in opposite directions to form common straight channel. Intermediate channel length at all stages and in each moulding moment is taken to equal the distance between plastic deformation centers. Billet material is changed into stress-strain state by varying male die transfer speed-to-half die transfer speed ratio.

EFFECT: fine-grained structure of materials.

11 cl, 9 dwg