The modern derivation of the ancient lost wax process. The wax models are realized using machined or electro discharge machined aluminium moulds. Then, they will be placed into special tanks containing thermosetting resins and micro ceramic granules. These two elements polymerize together, giving rise to an external coating that withstands the high temperatures of the molten metals. In order to minimize the issaunce of microporosity on the castings, the so-called "casting cluster" or "Shell" is introduced into a high-temperature autoclave for the complete evacuation of residual wax, obtaining in this way a negative mould ready for the next operation. At this point, after having preheated the "Shell" or "casting cluster", the molten metal is poured into it and left to cool in an environment with controlled temparature in order to avoid any metal work hardening. The external coating will be destroyed and the castings will be removed singularly, before being submitted to machining or surface finishing.Dimensions and production batches
According to the planning of our customers, our compamy can produce small or large batches ensuring on-time deliveries. The dimensions of the products can vary from few grams up to 75 kg.
EDR Fittings outsources melting and machining on the Chinese market adhering to ISO9001 strict quality standardsset by DNV. Thanks to its fifteen years of experience in the melting industry,EDR Fittings has selected and built up along with it different ISO 9001 certified foundries distinguishing them by:
› melting dimension
› production batch quantity
› used material
› required finish
› melting process ( water glass, silica sol, sand casting)
› machining complexity
› melting dimension › production batch quantity › used material › required finish › melting process ( water glass, silica sol, sand casting) › machining complexityManufacturing time of samples
EDR Fittings ensures rapid prototyping inless than 30 days supplied with detailed dimensional reports and material analysis. (For food use DM258 21/12/2010 Migration testing 10)Advantages of Investment Casting ( Lost-waxCasting )
› Important cost reduction by getting a high quality and industrialized product.
› Possibility of making products with a complex shape and under cutina single piece by eliminating costly machining or welding.
› Precision melting withvery limit eddimensional tolerances.
› Flexibility of production batches without tooling costs.
› Blow equipment cost that is often depreciated already with the first production order.
› High quality surface finish and possibility of inserting your company logo or code direct lyon the melting.
› Possibility of meltingall materialswhile maintaining their mechanical properties.
The tables, shown, indicate the linear tolerances as a function of the degrees of precision that are required.Continue