METHOD OF PRODUCING PLUNGER TIP FOR DIECAST MACHINE

摘要

A manufacturing method of a plunger tip for a die casting device is provided to prevent the plunger tip to be connected with a plunger rod from being damaged by improving the hardness. A manufacturing method of a plunger tip for a die casting device comprises followings. The steel inside of the cylindrical of the die casting device plunger tip is cut to processes to be a plunger tip main body member of hollow(10). The tip-end part of the separately manufactured plunger tip is welded in the plunger tip main body member of hollow(20). A plunger tip(30) is cooled after heating up in order to remove the residual stress remaining in the plunger tip by the welding in the welding stage. The heat treatment agent made of the powdered including the carbon is coated on the surface of the plunger tip. The hardness of the surface of the plunger tip is intensified(40). After the heating process, the plunger tip is heat again and cooled at the fixed temperature(50). The heat treatment agent comprises carbon, silicon, manganese, phosphorus, sulfur, chrome or molybdenum. The steel representing of the plunger tip comprises the chromium molybdenum steel.