PROCESS OF LOST WAX MICRO CASTING WITH RECYCLING OF EXHAUSTED WAX

摘要

The present invention relates to the recycling of exhausted wax in a process of lost wax micro casting, comprising the steps of: - molding of one or more wax models, identical to the end pieces to produce, using a first formulation of wax; - molding of one or more molds of sprues (connecting passages), using a second formulation of wax; - assembling of said one or more models and said one or more molds of sprues, to form a cluster; - coating of said cluster with a ceramic shell; - removing of wax from said shell; - treating of said shell in an oven; - casting of molten metal alloy within said shell and subsequent cooling to obtain a solidified casting; - cracking of the shell to release the solidified casting; - removing of the sprues and finishing of the pieces; and characterised in that it additionally comprises the following steps: - melting of the exhausted wax coming from said step of removing wax from said shell, to obtain a molten exhausted wax; - removing of water from said molten exhausted wax, to obtain de- hydrated molten exhausted wax; - removing of ceramic residues, ashes or other impurity by filtration of said de-hydrated molten exhausted wax, to obtain recycled wax; - adding virgin wax (grade 50-60°C) in a quantity equal to at least 30% by weight of the total of the recycled wax, and at least equal to the amount of recycled wax in the case in which the same has been already obtained following a process of lost wax micro casting in which a wax formulation that contain recycled wax was used, to obtain said second formulation of wax; - delivering of said second formulation of wax to said molding of one or more molds of sprues.