METHOD OF HELICAL ROLLING OF AXIALLY SYMMETRICAL PRODUCTS Russian patent published in 1996 - IPC

FIELD: metal pressure forming, namely making of elongated cone tubes such as metallic telegraph posts. SUBSTANCE: method of helical rolling of axially symmetrical products from cylindrical tubular blanks being rolled in two helical roll grooved passes comprises steps of orienting lengthwise axis of tubular blank normally relative to plane including axis of grooved passes; moving blank towards grooved passes in direction of its orientation through opening of grooved passes with subsequent clamping of end portions of blank; before rolling in helical grooved passes cone article from cylindrical tube imparting out-of-roundness to cross section of that blank in such a way, that small axis of oval is equal to diameter of tube in rolling zone and parallel with axis of roll grooved passes; moving end portions of article being rolled relative to opening grooved pass upon lengthwise axis of tube parallel with initial position of blank. EFFECT: lowered metal consumption and energy consumption. 1 cl, 3 dwg