Machine for forming metal bars

Abstract

A machine for forming metal bars, in particular for producing ingots made of precious metal such as gold, silver, precious alloys, as well as other pure metals or different alloys, in the form of solid metal powder, grits or swarf of various sizes, having an ingot mould and a cover for closing the ingot mould when filled, the ingot mould has a dimension in height such that the cover passes from a first position to a second position when the volume occupied by the mass of metal that fills the ingot mould reduces gradually up to one third of the initial solid volume. In the first position the cover rests on the metal that fills the ingot mold and remains raised with respect to an abutting edge of the ingot mould, in such a manner that the bottom of the cover compresses and thus uniformly compacts the powders, the grits or the swarf so that, during the melting step, in the second position, the cover lowers progressively as the metal melts, until it rests on the abutting edge of the ingot mold, thus hermetically closing the ingot mould.

1 . A machine for forming metal bars, in particular for producing ingots made of precious metal such as gold, silver, precious alloys, as well as other pure metals or different alloys, in the form of solid metal powder, grits or swarfs of various sizes, as well as other pure metals or different alloys, comprising at least one ingot mould and a cover for closing said at least one ingot mould when filled, wherein said at least one ingot mould has a height dimension such that said cover passes from a first position to a second position when the volume occupied by the mass of metal that fills said at least one ingot mould reduces gradually up to one third of the initial solid volume, in said first position said cover rests on the metal that fills said at least one ingot mold and remains raised with respect to an abutting edge of said at least one ingot mould, in such a manner that the bottom of the cover compresses and thus uniformly compacts the solid metal powder, grits or swarf so that, during the melting step, in said second position, said cover lowers progressively as the metal melts, until it rests on said abutting edge, thus hermetically closing said at least one ingot mould. 
     
     
         2 . The machine according to  claim 1 , wherein the interior space of said at least one ingot mould comprises two distinct volumes, a first lower volume, which constitutes the actual mould wherein the form and the dimensions of the ingot are determined, and a second upper volume, configured to facilitate the deposit of the solid metal powder, grits or swarf during a loading step.