METHOD AND APPARATUS FOR PRE-COMPACTING MOLDING SAND

摘要

MOLDING SAND FILLED IN A SPACE DEFINED BY A PATTERN PLATE AND A FLASK IS PRE-COMPACTED BEFORE THE MOLDING SAND IS COMPLETELY PRESSED. A PRE-COMPACTING MEMBER IS INSERTED INTO THE MOLDING SAND TOWARD THE PATTERN PLATE, AND THEN IS STOPPED BASED ON A PREDETERMINED DEPTH OF THE PRE-COMPACTING MEMBER IN THE MOLDING SAND OR A PREDETERMINED PRESSURE CAUSED BY THE PRE-COMPACTING MEMBER IN THE MOLDING SAND.