METHOD FOR CREATION OF ULTRAFINE-GRAINED STRUCTURE IN METAL STOCK AND DEVICE FOR ITS REALISATION Russian patent published in 2008 - IPC B21J13/02 B21J5/00 C21D7/00 C22F1/00 

FIELD: technological processes.

SUBSTANCE: creation of ultrafine-grained structure in metal stock by means of its strain treatment with upthrust includes staged compression of stock with vertically compressing puncheon in die mold that contains matrix limited down with flat bottom, with cavity for stock installation in it and intended for treatment of stock in three orthogonal directions with provision of plastic flow of stock material along directions that do not coincide with direction of compression force. At every stage of strain treatment the stock is placed in matrix cavity, compressed, and deformed stock is taken out from matrix cavity. Prior to installation of stock in matrix cavity the bottom part of matrix cavity is filled with charge of refractory powder for 0.1-0.5 of compressed height of stock, then stock is placed for filling, charge is filled into free space created between two pairs of sliders and stock to the level that exceeds top point of stock by 0.1-0.5 of its compressed height, matrix is inserted into puncheon, displaced to provide stock compression of 10-60% from its height. Stages of deformation treatment of stock are repeated, changing directions of its strain, until ultrafine-grained structure is formed in the whole volume of stock. Device for formation of ultrafine-grained structure in metal stock during its strain treatment with upthrust arranged in the form of die mold that contains matrix with rectangular base plate, puncheon and two pairs of sliders installed in two mutually orthogonal directions. Upthrust is arranged in the form of charge from refractory material that fills the free space between sliders, matrix bottom, puncheon and stock.

EFFECT: production of bulky metal stocks with different ratios of size and increase of finished product output.

5 cl, 4 ex, 3 dwg