METHOD OF MAKING ARTICLES WITH CROSS SECTION, VARIABLE ALONG THEIR LENGTH Russian patent published in 1995 - IPC

FIELD: rolled stock production. SUBSTANCE: method comprises steps of applying an axial counter-tension effort P_c.t. to an end of a secured blank at a side, opposite to a place of roll pressing-in, over the whole period of rolling process; determining a value of the above mentioned counter-tension effort from relation , where σ_y-yielding strength of the metal, being rolled in its initial state, kgF/mm²;; (0.7-1.2)-factors, whose large value is being selected upon percentage reduction ε=0.1 and small value upon percentage reduction e=0.4; S-minimum square of cross section of the article, mm; applying to an opposite end of the blank a drawing effort for drawing the blank between a pair of non-driven rolls; subjecting these rolls to a radial motion, whose value depends upon a value of lengthwise motion of the blank and determining that value according to a schedule of rolling process for each working stroke. The working stroke had been terminated, the blank is being returmed to its initial position, and simultaneously it is being rotated around a lengthwise axis. EFFECT: enhanced efficiency. 1 cl, 7 dwg