METHOD FOR CASTING OUT DISCRIMINATION MARK OF CASTING

摘要

PROBLEM TO BE SOLVED: To allow a mirror image mark of a discrimination mark having a complicated form to be carved in a short period of time at a cavity surface of a cast. SOLUTION: The mirror image mark is carved with a marking device 20 moving a carving terminal 25 along the cavity surface 12a while repeatingly protruding it by air pressure on a flange surface 12a of a core mold 11 as the cavity surface of the cast for casting out the discrimination mark at an end surface of a socket of a cast iron pipe that is centrifugally cast. By this way, the mirror image mark of the discrimination mark having the complicated form can be carved in a short period of time at the flange surface 12a of the core mold 11. COPYRIGHT: (C)2011,JPO&INPIT