A new porthole die structure named protection type with four cavities in a die for semi-hollow Al-profiles is presented in this article. Through a practical case, the determination of parameters for the new structure were described, mainly including the structure composition that it is made up of three parts in replacement of the traditional two piece structure; the design of portholes and the structure of chamber in the female die and the selection of the bearing were also included. The method of checking the die strength was introduced. And according to the extrusion results, the structure of the traditional porthole die in a common code, the cutting type of porthole die with single cavity and twin cavities and the protection type of four cavities were compared. It indicated that the characteristics of the latter structure with four cavities are simple and easy to process. The practical application shows that the new structure can greatly improve the efficiency of the extrusion machine and significantly prolong the die life. Furthermore, the high precision and the surface brightness of profiles are obtained. The structure is worth promoting. The purpose is to promote the technology, provide reliable reference data for further development of the porthole die with multi-cavities in a die for semi-hollow profiles.
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