Filtration Group Industrial’s customer is one of the most modern customer investment foundries in Europe and supplies castings from an exceptionally wide range. The finished investment castings are manufactured using the lost wax process described above, which releases high concentrations of fine dust, especially during sanding and final fettling. An existing air handling system no longer met the current requirements for air performance, filter service life and cost-effectiveness. Filtration Group Industrial designed a plant optimization for the customer for this application. In addition to advice on modernization and adaptation to the pipe system, the core components consisted of a new cartridge filter system adapted to the confined space conditions by means of a dust drawer.
The lost wax process is a standard process in investment casting. To produce the wax patterns, special waxes are poured into silicone moulds using the vacuum casting method. With increasing complexity of the components, the wax patterns are preferably made in several parts and assembled to the finished wax pattern. The individual models are then combined to form a model cluster. The inverted mould shell is then produced by dipping the models into a mass of fine-grained ceramic material and liquid binder which later dries out. The “sanding” is then carried out in a partially lined manipulation plant – the dry ceramic moulding sand is applied to the moist wax core surface, where it forms a growing layer. This process is repeated until a sufficient layer thickness is available. During this process there is a strong dust formation due to the fine components in the moulding sand. The spread of these airborne dusts into production rooms is usually prevented by ventilation measures.
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