FIELD: metallurgical equipment, namely die tools for forming straight-seam welded large-diameter tubes in press. SUBSTANCE: each of paired inserts of tool has protrusions; each die holder has respective grooves coinciding along two supporting planes parallel relative to parting plane and spaced from it by distance no more than radius of inner cylindrical shaping surface. In such design values of local maximum stresses in walls of inserts are multiply decreased until safety level. EFFECT: enhanced reliability of die tool. 1 dwg
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