The furnace is ideal to melt precious metals. All ITALIMPIANTI ORAFI induction melting furnaces are
fitted with static frequency converters.
A high efficiency of the electrical output that drastically reduces electricity consumption, maintaining the
production rate, is obtained by the frequency conversion system used.
The modular construction of the electric circuit board greatly simplifies maintenance operations and
guarantees high reliability even in the most demanding working conditions.
The highest technical standards used to design the inductors along with the modular construction and the
use of only high quality materials guarantee maximum production even in the worst conditions.
Technical data of the furnace
• Capacity of the crucible : 75 Kg of AG or 110 Kg 18 Kt Au
• Melting time : 40 minutes
• Dimensions : 900x1000x1870 mm (L x W x H)
• Interchangeability of the crucible to melt different precious alloys
• Automatic temperature control of the metal with a platinum, 10 % platinum-rhodium thermocouple
Technical data of the converter
• Power output : 40 kW
• Working frequency : 3.5-4 KHz
• Plant power hook up : 45 KVA
• Power-supply tension (3 phase/50 HZ) : 380 V, +/- 6%
• Power factor (cosF-i) : 0.9
• Required cooling power (generator/furnace) : 21500 Kcal/h
• Min pressure for the cooling water pump : 3 Bars
• Cooling water inlet temperature : 25° + 35°C
The converter is fitted with a demineralised water cooling system consisting of a pump, an internal
deioniser with a conductivity sensor and a heat exchanger accessible from the outside so that it can be
connected to the general cooling system of the factory.
Monitoring on the display of the process parameters, electrical conductivity, as well as the working
parameters of the converter (tension frequency and the absorbed power).
Computerised alarm diagnostics for 16 alarms or warnings which the worker must take note of for the
system to work properly. By simply pressing a button, instructions and advice appear on the display.
Memorisation of the last 20 alarms which allows a rapid diagnosis of any eventual problems.
Closed ring power regulation which allows the system to absorb the set power regardless of the quantity
and type of metal to melt.
The internal environment of the converter is conditioned by an air-water exchanger.
Threephase power-supply transformer :
- Nominal power: 45 KVA
- Nominal tension : depends on where the machines
- Allowed fluctuation of the electrical mains : +/- 10%
- Dimensions : Generator : 850x950x1800 mm (L x W x H)
MELTING FURNACE
The furnace is made up of a strong iron frame with 12 mm thick stainless steel sides to reduce losses
due to inductive phenomena. The coil for induction heating is immersed in refractory cement. Both
crucible and coil are held in a resin and fibre glass casing of adequate thickness.
The crucible tilting system is hydraulic, by means of two double-effect pistons with adjustable speed.
The crucible spins around an imaginary axis passing through its edge. The furnace is equipped with
two propane gas burners to protect the metal and the crucible edge from oxidation. The furnace is also
equipped with a timer which automatically stops both propane gas inflow and coil cooling pump after
the generator has been stopped.
Ex-Factory, Italy
Price: € 56.100,00
Packing: €550,00
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