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The casting chamber is fully evacuated by vacuum before melting, followed by helium gas supply to create an inert atmosphere.Helium gas has an excellent gas fluidity which provides a cleaning effect of the molten metal and mould and guarantees a smooth filling of metal even of the most intricate patterns.The casting temperature is attained and low frequency pulses are given to vibrate and mix the molten metal by keeping it homogeneous. Temperature is controlled by an optical pyrometer up to 2100°C for platinum and steel and by an immersion type “S” thermocouple inside the graphite crucible up to 1450°C for gold,silver and bronze.
At this stage, just by pushing a button, the whole crucible/flask system will automatically rotate 90° and the metal, once poured in an homogeneous and controlled way into the flask, it is automatically pressurized to 4 bars by argon gas.This high and quick pressurization is indispensable to obtain a proper and homogeneous filling, even at low metal/flask temperatures, for gold, silver and bronze alloys and, above all, for platinum and special steels which have a very narrow melting interval, thus a very quick solidification. This results in a very smooth surface due to the effect of the vacuum and a dense, well compacted casting due to the “over pressure” of 4 bars, which benefits both thick and thin sections.
The system used by our Pressovac series casting machines was specially developped for dental labs where casting perfection is absolute: casting pieces have a very smooth surface, a very dense molecular structure and without defects like unproper filling,porosity and shrinkage. Metal is inserted into the crucible and the flask positioned on the cradle inside the casting chamber.
The “MAX” version of our Pressovac machine is free-standing and offers the same proven features and functions as the standard Pressovac,
but accepting a larger flask and with an enhanced casting capacity (flask size up to 100 mm ø x 150 mm h.) All functions are touch-screen controlled.A three-phase version is also available and recommended for large envisaged productions. The machine features: • Optical infrared pyrometer for platinum and steel casting up to 2100 °C • Immersion-type “S” thermocouple for gold and silver casting up to 1450 °C