CORE FOR MAKING BRANCHED DUCT SYSTEM IN CASTING Russian patent published in 1994 - IPC

FIELD: casting production. SUBSTANCE: core has a mandrel of soft wire, on which a springy wire helix is wound. In order to obtain a branched duct system the core has several portions (branches), whose number is equal to a number of the ducts. In leading part of the core the helix is multistart, it is wound simultaneously of row of parallel placed wires, whose quantity is equal to a number of cores, and it is separated in branching places to helices with a number of starts, equal to a number of successive branches of the core. EFFECT: lowered labor consumption, decreased cost price and enhanced rigidity. 1 cl, 1 dwg