The composition of extrusion force was analyzed. The die structures to reduce the force were put forward, such as reducing mold thickness and the compression area of metal feeding, the hollow bridge number, using the inclined surface of the metal feeding and the front feeding plate, the structure of porthole that one divides into two, the larger the feeder ratio. And the methods of chamfering in inlet of the bridge and appropriate reaming of porthole are also effective. Practice shows that reducing the height of chamber and decreasing the length of bearing are also available. These structures are verified by practice and the effect is good. The aim is to provide reliable reference to colleagues.
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