The technique of the cast iron in the lost wax.
The principle of the cast iron the lost wax consists in making penetrate into some metal in fusion(merger) inside a refractory mould, having melted beforehand the wax model which it contained. Two cases can appear: let be the cast iron pull(entail) the destruction of the wax original model ( direct cast iron); let be the model is saved(spared), to avoid an accident of cast iron or realize several copies (proceeded indirect). In that case, a moulder realizes a reusable mould (in good hollow), in rooms(parts,plays), on the original model. For the complex volumes, it is obliged to cut the model to facilitate the molding. In this mould, we pour some liquid wax, andor we apply him(it) to the brush, andor we arrange wax pancakes.
Preparation of the mould:
The sculptor retouches the wax, deletes(eliminates) the joints of the mould and specifies details. Inside the mould stocked with some wax, we arrange a nucleus(kernel), sometimes maintained by an armature. On the wax, we arrange wax sticks to realize a network capable of making pour(sink) the wax (sewers), to evacuate air(sight) and gas ( évents ) and to feed with metal (jets). The wax is then wrapped with the mould of hotpot and needles can cross mould(mussel) and wax to maintain the nucleus(kernel). In 200-300 degrees, the fluid wax evacuates by the sewers which will be filled(blocked). His(her,its) disappearance frees(releases) the space between the mould and the nucleus(kernel) and determine the network of food(supply). The mould and the nucleus(kernel) are then stewed, then cool slowly.
Cast iron itself:
The metal in fusion(merger) is then poured. The composition is variable. The bronze, established(constituted) by copper with a low(weak) percentage of tin, is rare in France, replaced by complex, often quaternary alloys by the zinc and lead addition. The composition is all the more empirical as a part(party) of the metal results from revision and as metals are not pure. The variations of the alloy determine the color (of the yellow in the red), the coulabilité, the resistance or the ease of the cold work. After cooling, the bronze went out of the mould.
A first work allows to cut and to file the jets, the sewers and évents, to remove the crust, to block holes and porosities, to cut the armatures. Then follows the chasing which can resume(take back) details, unify surfaces or liven up(lead) them. The melted parts(parties) separately or certain accessories are assembled. The metal oxidizes in time and covers itself with one skate natural. Skate artificial are crossed(spent) on surface. Their composition and their color (oil, soot, lacquer, varnish) vary according to receipts(recipes) and tastes