TVCd-XL Double Chamber

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Pressure over Vacuum Casting Machines

TVCd-XL is a family of pressure over vacuum casting machines designed to meet the more severe needs in lost wax casting production of aluminium, bronze, steel, magnesium alloys. They are often used in connection to a 3d printer for direct casting to get metal parts of complex objects.

This family of machines 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-XL, melting chamber and flask chamber are completely indipendent: while 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 and reduced shrinkage 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, featuring 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.

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.

 

Technology & Features

Steps

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
  • Two thermocouples temperature measurement with AVG function
  • 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

Technical data

(Customized models are available on request with special features)

  TVC25d TVC35d TVC45d
Crucible volume 2 or 3 liter 4 liter 7 liter
Crucible working capacity 10 kg Steel (*)
3 kg Magnesium
5 kg Aluminium
18 kg Bronze
16 kg Steel (*)
4.5 kg Magnesium
7 kg Aluminium
24 kg Bronze
24 kg Steel (*)
8 kg Magnesium
13 kg Aluminium
42 kg Bronze
Flask maximum diameter (mm) Provided 350   /   Available on request 450
Flask maximum height (mm) 600 600 600
Induction power 25 kW 35 kW 45 kW
Vacuum pump Internal Internal Internal
Pressure over vacuum 1 bar 1 bar 1 bar
Max. temperature Provided 1250 °C   /  Available on request 1600 °C
Temperature control 2 thermocouples
Metal granulation Available on request Available on request Available on request
Autotest Provided Provided Provided
Monitoring system for data acquisition Provided Provided Provided
Flask check before casting Provided Provided Provided
Vacuum leakage detector Provided Provided Provided
Oxygen Analyzer Available on request Available on request Available on request
Remote assistance Provided Provided Provided
Main alloys Gold (Au), Silver (Ag), Copper (Cu), Brass, Bronze, Steel, Aluminium (Al) and their alloys; Magnesium alloys require a special option, available on request.

 

Provided Provided - Available on request Available on request - (*) Version TVCd-FNF for ferrous and non-ferrous metals

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