Abstract
A inlay type porthole extrusion die for the semi hollow profiles is presented. The structure parameters of the die are introduced. The selection of structure parameters is described in detail, it mainly includes the structure of male die and the layout of portholes, it also includes the determination of fitting clearance, the size of cores, the structure of the chamber and the bearing etc. the new structure has the obvious advantages, it can greatly improve the life of the die, it is a good structure which is worth of popularizing.
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