Abstract: In this process for manufacturing extrusion dies each comprising a main body (4) and a mandrel (12M) for channeling the material or materials extruded simultaneously, mounted in this body and provided, or not, with a core (15) and, on the one hand, the main body (4) of the die is provided with a central extrusion passage (5) made, along the outer profile (17) of the product desired, by means of a cutting operation using wire (2) erosion and, on the other hand, the mandrel (12M) internal to the die body, provided, or not, with a core (15), is obtained by molding a material suitably resisting the heat of extrusion and having good toughness.

Abstract: This shaping device, designed to subject the linearly extruded product to a continuous cooling operation or hot vulcanization operation during shaping is in the form of a tunnel (1) the outer casing of which has incorporated internal channels (A) which do not open out into the inside of this outer casing and which circulate a liquid or fluid at a temperature determined on the basis of the cooling or vulcanization operation chosen, this tunnel having on the inside, mounted in a vertical position, several matrices (FIG.

Abstract: According to the invention, calibrated rings are obtained by superficially vulcanizing extruded or profiled extrudate at the exit of an extrusion head (T), then by cutting this vulcanized extrudate into portions by means of a conical cutting device (C), subsequently by butting the two ends, in the respective form of a conical tip and a funnel, of each portion (t) together under hot conditions and under a controlled pressure, in order to obtain a ring blank which is then engaged between the half-cavities of a mold (Mo), where it undergoes shaping and vulcanization by the heating of the latter and thereafter deburring as a result of a shearing action produced by a push device (D) causing the half-cavities to slide in the closed position in the frame of the mold, before causing the opening of the latter by means of a device (G) and the release of the calibrated and superficially clean ring obtained.