FIELD: machine engineering, namely manufacture of bottoms of pressure vessels, for example shaping cone-like bottoms of barometric mixers in small-batch production.
SUBSTANCE: method is realized by bending blank along profile of shaping punch and not by rolling it around it. Seam is welded after bending when part is still on shaping punch. Such technique of joining ends of bottom body eliminated influence of temperature drops upon structure of bottom. In order to perform local heating of bent portion of cylindrical part of bottom, gas torch is used. It prevents necessity for heating the whole blank. Special changeable holder for bending bottom blank and for imparting to it profile of shaping punch is provided. Said holder includes body where freely rotating pressure rollers are mounted in pivots. Rotation axes of said pressure rollers are parallel to generatrix lines of lateral surface of cone like shaping punch in zone of their touching and they are spaced from them by the same distance.
EFFECT: manufacture of bottoms with minimum capital investments and minimum fluctuations from constructional demands.
2 dwg
