STAMP FOR OBTAINING CYLINDRICAL METAL PARTS WITH UNIFORM SMALL-SIZED STRUCTURE FROM BAR STOCKS Russian patent published in 2017 - IPC B21J13/02 B21J5/06 C21D7/10 

FIELD: metallurgy.

SUBSTANCE: stamp contains upper and lower punches and a matrix. The diameter of the upper punch is equal to or greater than the diameter of the bar stock. The diameter of the lower punch is smaller than the diameter of the upper punch and is equal to the diameter of the part. The matrix is made in the form of the upper, intermediate and lower parts. The upper part has an inlet cylindrical section, the diameter of which corresponds to the diameter of the upper punch. The outlet opening of the upper part has a diameter smaller than the diameter of the upper punch. The intermediate part of the matrix has a starting and a cylindrical portion. The diameter of the starting portion corresponds to the diameter of the outlet opening of the upper part of the matrix. The diameter of the cylindrical portion is larger than the diameter of the outlet opening of the upper part of the matrix and the diameter of the lower punch. The lower part of the matrix is made with inlet and outlet cylindrical portions. The diameter of the starting portion corresponds to the diameter of the cylindrical portion of the intermediate part. The diameter of the output portion corresponds to the diameter of the lower punch.

EFFECT: increasing the degree of accumulated shear deformations in one pass.

2 cl, 5 dwg