(☆?☆ ）Porthole molding using the extrusion die by a punch and die assembly from said upper die comprising: a vent hole, the bridge die, the first core and drainage grooves; the lower mold comprising: welding cavity mold holes and empty knife. The utility model is based on seven core head 13, the gap between each of 3mm, high precision (0.05mm), so the use of the integral good of the seven core processing disposable electrode head to work with. using porthole die extrusion die, with parts of the dimensional accuracy of the place, the aluminum surface quality to meet the requirements, increasing the life of the mold, reducing the production costs of industrial aluminum.
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