PROCEDURE FOR THE PRODUCTION OF FERRULES AND OTHER FEEDING HEAD AND SUPPLY ELEMENTS FOR CASTING MOLDS, AND FORMULATION FOR THE OBTENTION OF SAID FERRULES AND ELEMENTS

摘要

The couplings and elements for hot topping and supply, which can be of the isolating or exothermal type, are obtained by blowing or manual casting of a formulation which comprises hollow microspheres of aluminium silicate having an alumina content lower than 38 % by weight, an agglomerating agent and optional loads, in non fibre form. Depending on the density of the microspheres, appropriate formulations can be obtained to fabricate isolating or exothermal couplings and elements for hot topping and supply. The resulting couplings present an external and internal size accuracy and may be coupled to the mold after they have been fabricated, without additional manipulation and manually or automatically. These couplings are appropriate for the fabrication of ferrous and non ferrous metal parts.