Thanks to their modular structures and tried-and-tested system design, VSG induction-heated vacuum melting and casting systems can be used anywhere and will prove very reliable, and are ideally suited to melting and casting metals, alloys, and special materials, as well as production.
VSG induction-heated vacuum melting and casting systems from PVA are cold-wall furnaces made of corrosion-resistant stainless steel with water-cooled double jackets. The melting and casting equipment comprises the tiltable induction coil with a coaxial power and coolant supply and the die holder. The crucible material used is adapted to suit the molten material. If the molten material is allowed to come into contact with material that contains carbon, the crucible can be made of graphite or graphite clay; otherwise, crucibles made of oxide ceramics are used. If necessary, crucibles made of metals with high melting points can also be used, provided that the molten material will not react with them. In these cases, the crucible acts as a secondary winding. Power is supplied via static medium-frequency converters in transistor technology.
Depending on customer requirements, either high-vacuum or fine-vacuum pumps are used; in their default configuration, these consist of a combination of a rotary vane pump and a Roots pump. Oil diffusion pumps are provided for high-vacuum applications. These present less potential for problems than other HV pumps in terms of metal vapor and dust. Vacuum melting and casting systems are available with single or multiple chambers and comprise the following basic modules: system vessel, vacuum pump, power supply and controller, melting and casting equipment, and an airlock mechanism with tools for handling the melt. These modules can be combined in various configurations as required, and an extensive selection of accessories can be added to them.