Desenvolvimento de um molde refratário para produção de peças metálicas pelo processo de fundição de precisão.

Abstract

In the Foundry Laboratory, the main processes of the area are carried out in a didactic way. Precision casting for lost wax is an example of them. Having a method already established for the accomplishment of this process, this work was carried out in order to develop a new way to produce metal parts, starting from a wax model (which will be lost). Initially the laboratory produced the investment liquid metal receiver with sand, plaster and water. The pieces, so far produced, fulfill their obligations well: to exemplify the process, showing in a simple way how the pieces are produced and the defects that can appear in them. With the objective of executing a new method of confection of castings, approaching it in the way made in the industry, that is, generating parts with less defects and that do not have to be submitted to other processes, like machining or conformation. This work was carried out in order to find the correct composition of the new constituent materials of the ceramic shell: silicate and refractory powder. The parts obtained were compared to others made by the old method. Thus, they were judged which of the two presents the best cost-benefit relation to be explored by the laboratory.