PRODUCTION OF COMPOSITE MOLDING DIE

PURPOSE:To improve the quality of dies and to reduce the production cost by molding a die molding part, as a drag, embedding a consumable pattern into the other to be formed as a cope, and successively pouring the melts of a tool steel and cast iron compsn. into the drag and cope under a reduced pre...

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Bibliographic Details
Main Authors SASAI TAKAYUKI, HATTA MASAMI, KUBO KIMIO
Format Patent
LanguageEnglish
Published 07.01.1988
Subjects
CASTING
CASTING OF METALS
CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
FOUNDRY MOULDING
PERFORMING OPERATIONS
POWDER METALLURGY
TRANSPORTING
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Summary:PURPOSE:To improve the quality of dies and to reduce the production cost by molding a die molding part, as a drag, embedding a consumable pattern into the other to be formed as a cope, and successively pouring the melts of a tool steel and cast iron compsn. into the drag and cope under a reduced pressure suction state. CONSTITUTION:The consumable pattern 1 molded of a foamed styrene is cut near the molding part 2 and the drag 4 is molded in such a manner that the cut surface 3 serves as a parting plane. The consumable pattern of the other part 5 is imposed on the drag 4 and molding sand is packed therein to mold a cope 6. The consumable pattern of the molding part 2 of the drag 4 is then rapped and the cope 6 and the drag 4 are mated. The melt of the tool steel compsn. is poured into the molding part 2 while the pressure in the casting mold is reduced from a reduce pressure suction port 8 and the melt of the spheroidal graphite cast iron is poured into the mold to consume the consumable pattern of the other part 5 after the prescribed time. Since the molding part 2 of the drag 4 is a gap, carbon residues do not remain therein. The die quality is, therefore, improved and the production cost is reduced.
Bibliography:Application Number: JP19860146424