MECHANISM OF BLOW-OUT MANDREL Russian patent published in 2001 - IPC

FIELD: devices for blowing-out of various geometric forms, mainly of the shell structure, of sublimation materials. SUBSTANCE: the mechanism has a hydraulic cylinder provided with mandrel heads providing for detachable connection between the hole in the mould and the mandrel external head for keeping air pressure in the mould. The axes of the mandrel head and piston group do not coincide. At least a pair of the mandrel heads has an independent reciprocating motion, changed rigid static installation between the axes of the mandrel heads, and a common horizontal feed at an arbitrary position relative to each other. Each mandrel head is rigidly coupled to the body of the hydraulic cylinder. The mandrels are positioned in a horizontal groove of the cross-piece head, where hydraulic cylinders are independently secured in its holes, they can accomplish reciprocating motions together with the mandrel head. The cross-piece ensures planned horizontal reciprocating motions on parallel installed axles rigidly coupled to the channels. The mandrel is provided with a cylinder-spheroidal process surface providing for self-adjustment at the inlet to the mould hole and tearless outlet from the mould. The built-up hydraulic cylinder has no members of rigid coupling. Stiffness of the hydraulic cylinder is enhanced due to coaxial cylindrical steps of the end members accommodating elastic seals. EFFECT: enhanced quality of manufactured articles of materials yielding to volumetric expansion. 3 dwg