FIELD: machine building.
SUBSTANCE: pipe billet is pre-flattened, flattened section is bent and expanded by internal pressure. Flattened section is made at would-be bend location and placed in stiff female die with steeply curved channel. Said channel is used to make pipe steeply curved part internal radius and, then, initial diameter by expanding said flattened part by internal pressure in preheated female die.
EFFECT: ruled out loss of stability.
4 cl, 5 dwg
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