Forming process with one-time form that is created around a wax model where the wax is then melted away to be replaced by molten metal. Beskrivning The process The molding process comprises a number of steps where the first is to create a mold intended to produce the exact details of wax copies [1]. The mold is again used to create the sought number of wax copies, further treatment is done to remove any burrs and other inaccuracies. Wax copies are then fitted to the cast and aeration channels of wax [2] and a cone is also added to the top. The wax pattern is then dipped into a liquid mixture of silica sand [3]. The wax pattern covered with the mixture is then inserted into a furnace for the mixture to solidify and for the reusable wax to flow out [4]. When the mixture has solidified, the mold is created [5]. It’s then preheated and possibly placed in a sand vat to avoid defects when molten metal is poured into the mold. Once the metal has solidified, the mold is removed with a hammer or a vibrating table. The channels and the metal models [6] are removed, which are then processed to remove any surface irregularities. Lost wax casting Process photos Process films Advantages and disadvantages In comparison with alternative methods Useful for complex shapes Good surface finish with no dividing line Good dimensional accuracy Suitable for shorter series can cast non-processable components draft angle is not necessary Expensive process Complex cores involved long cycle
