FIELD: plastic metal working, namely, production of thin-wall members of pipeline systems by cold forming of tubular blanks with use of elastic medium pressure. SUBSTANCE: tubular blank with flexible filler in the form of cylinder is arranged in split die. By means of punches acting in axial direction onto ends of blank and filler, they are upset with different speed. Relation between speed of filler unsetting and speed of blank upsetting is selected according to expression given in description of the invention. EFFECT: enhanced efficiency. 1 dwg
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