TOPCAST SRL

Vacuum casting machine

TVC-d is the only Pressure over Vacuum Casting Machine available in the market conceived in a double chamber topology.
This unique characteristic is particularly suitable for 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 correspond in turn to
3 different levels of stirring energy. Two working temperatures are foreseen in the process. Homogenization 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. In fact, 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 flasks either with or without flange, either perforated 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 independence of the melting and flask chambers, new alloy can be loaded into the crucible without running the risk of oxidizing 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.