METHOD OF FORMING PARTS OF TAPERING SHAPE WITH CONCENTRIC ELLIPTICAL SECTION AND BOTTOM PART Russian patent published in 2025 - IPC B21D22/10 B21D19/00 B21D51/10 

FIELD: cold stamping.

SUBSTANCE: invention relates to cold stamping and can be used in production of large-size parts of tapering shape. Semi-finished product with a bottom and a wall of constant thickness having concentric elliptical sections is obtained. Semi-finished product is cut from the side of its edge and its deformation and flanging are performed. Device is used, which contains an upper plate, a matrix, an elastic element, a flat plate, sliding sectors and a cone. Flat plate is made with a contour repeating the external contour of the end surface of the elastic element. Sliding sectors are installed with support together with elastic element and matrix on support ring. Semi-finished product elements adjoining its bottom part are deformed along the whole length of the generatrix till the moment of contact with the matrix. Flanging of said elements is performed on the side of open end of semi-finished product.

EFFECT: obtaining parts with the same angle of inclination of the generatrix to the axis and the same thickness in sections perpendicular to the axis.

1 cl, 1 dwg