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TVCd: Double Chamber

Details

    Pressure over Vacuum Casting Machine, Double Chamber

    TVCd is the pressure over vacuum casting machine designed to meet the more severe needs in lost wax casting production.
    This machine works with a new, revolutionary double chamber concept. This innovative system gives several advantages compared with the traditional single chamber suction system currently available in the market.

    In TVCd melting chamber and flask chamber are completely indipendent and at the moment of casting the machine can control the metal injection into the mold by applying a differential pressure during pouring.

    This yields to a faster injection compared to the simply gravity pouring with the benefit to cast items at lower temperature. This will result in better surface finishing of the cast parts.

    The casting cycle takes only few minutes and, while the previous flask is cooling down in protective gas for no oxidation, the next charge can be loaded into the crucible and melted, thus overlapping two cycles for no time waste. 
    The machine is fully automatic having also a PC based monitoring system for process parameters acquisition and production data management with easy editing of casting programs suitable for many kind of alloy (optional).

    This revolutionary machine is the synthesis of the most advanced engineering and years of experience in casting that only TOPCAST will bring in your factory.

Products Details

Gas Wash Procedure

  • Crucible loading operation introduces oxygen
  • The Gas Wash Purge procedure removes the oxygen (1) in a very fast and efficient way and then refills back the chambers with Argon or Helium gas (2)
  • Compared with the traditional crucible protection with flow-meter regulation the consumption of gas is dramatically reduced and the alloys oxidation is minimized
  • Moreover the crucible life is increased: TVC series crucible last up to 250 – 400 casting cycles according to the graphite quality

Melting

  • Advanced Self Tuning thermoregulation (AST™) with exact temperature control of the melted alloys
  • Two Set-Points available: Homogenization and Casting Temperature
  • Medium frequency induction heating stirs the melted alloy and leads to a perfect homogeneity
  • Pulse Stirring Management (PSM™) for an extremely low frequency stirring
  • Highest power density in the market features strongest stirring and low gold losses

 Injection and Compression

  • When the stopper lifts up. it is very important to control the injection rate to avoid turbulences
  • TVC has the unique feature to have the injection rate controllable and programmable (IRC™)
  • The metal enters smoothly inside the mould (4). Then, after filling and during the solidification phase, a strong compression takes place on the tree (5)
  • No turbulences in filling and high compression rate lead to a large reduction of shrinkage porosity phenomena

Tree protection after casting

  • Thanks to the double chamber concept, after the solidification phase, the flask cools down in a protective atmosphere while at the same time you can load your alloy in the melting chamber for the next melting.
  • This operation will allows an overlapping of the casting cycles which will give you the ability to protect longer the tree before removing it without loosing time and productivity

Steps

  TVC5d TVC10d TVC12d TVC12d-Mg
Number of casting programs 100 100 100 100
Crucible working capacity 200g Aluminum
400g Bronze
500g Silver
1000g Gold
500g Aluminum
1500g Bronze
1500g Silver
3000g Gold
750g Aluminum
2300g Bronze
2500g Silver
5000g Gold
500g Magnesium
Flask max. diameter (mm) Provided 150 / Available on request 200
Flask max. height (mm) Provided 300 / Available on request 400
Induction power 4.9 kW 10 kW 12 kW 12 kW
Vacuum pump Built-in 25 m3/h
Pressure over vacuum 3 bar 3 bar 3 bar 3 bar
Max. temperature Provided 1250 °C   /   Available on request 1600 °C
Granulation unit Available on request Available on request Available on request  
Autotest with data report Provided Provided Provided Provided
Monitoring system for data acquisition Available on request Available on request Available on request Available on request
Flask check before casting Provided Provided Provided Provided
Vacuum leakage detector Provided Provided Provided Provided
Oxygen Analyzer Available on request Available on request Available on request Available on request
RS232 remote interface Available on request Available on request Available on request Available on request
Main alloys Gold (Au), Silver (Ag), Copper (Cu), Brass, Bronze, Aluminium (Al) and their alloys, Magnesium(TVC12d-Mg only)

Provided Provided - Available on request Available on request