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Product Features |
| Brand name: |
Topcast Engineering |
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| Description: |
TVC is a vacuum induction melting furnace for "pressure over vacuum" lost-wax
investment casting of jewellery, industrial prototyping and dental alloys. It
melts metals as gold, silver, copper, aluminum, brass, bronze, pewter.
For its peculiar features this family of machines is characterized of a very
high productivity and the highest casting quality today available in the market.
Casting cycle consists in melting the alloys in protective gas and then
injecting the molten metal in the vacuumed flask. After the filling and during
the solidification phase a strong compression takes place in the mould.
Oxygen extraction is obtained thanks to a patented system (GWP™) that guarantees
the purifying of the melting environment in few seconds from the loading phase.
Heating is provided by a medium frequency induction generator, to assure an
optimal stirring of the alloys while the temperature is accurately measured by a
calibrated thermocouple.
Induction power during thermoregulation follows a proprietary adaptive algorithm
(AST™) with 3 different control logics that corrispond in turn to 3 different
levels of stirring energy.
Two working temperatures are foreseen in the process. Homogeneization and
Casting temperature. This allows, in case of multiple metals melting, to obtain
a fully uniform product.
Process environment of the TVC vacuum casting machines, is divided in two parts:
the melting chamber and the flask chamber, each one with separated vacuum /
pressure control, in order to obtain different vacuum values when casting. This
allows to take control of the injection speed and the following compression
rate. This feature (IRC™) is exclusive of the TVC5-10-12 family and allows to
solve filling problems without increasing the process temperatures.
Infact, avoiding high casting temperature to solve filling problems is the key
point to not decompose the refractory, developing SO2 which is the main
responsible of the gas porosity problem in investment casting.
The melting chamber accepts a cylindrical crucible of graphite in different
sizes, according to the machine model, with an hole in the bottom and a stopper
rod which operates an open/close action.
The lower chamber accepts the refractory flask receiving the molten alloy. You
may use either flanged or unflanged flasks, with holes or just a simple steel
pipe.
A water-cooled sealing system allows the tree compression during the
solidification phase. After the parts solidifies the flask cools down in inert
atmosphere while, thanks to the indipendence of the melting and flask chambers,
new alloy can be loaded into the crucible without running the risk of oxydizing
the previous tree.
The control panel of the machine is simple and intuitive and, for the control of
the casting process, you need only three push-buttons.
To edit your 100 casting programs and monitor the process, a Touch-Screen with
Synoptic Display is provided. The machine comes out with a number of programs
already set and ready to be used for the most common alloys.
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