The AVDC process has been further developed by Alcoa.
After closing the die, air is evacuated through the die and the filling chamber and the molten metal is drawn into the filling chamber by low pressure. In comparison to other vacuum die casting processes, the AVDC vacuum in the die is very high, so that the resulting structure of the part is nearly pore free.
Most of the castings produced in Soest use the alloy AlSi. The average strength of the castings is 240 Mpa, the average elongation 15 %, and the minimum wall thickness is approximately 2 mm. The casting machines have locking forces between 750 and 4.100 t. Die casting components with a weight up to 20 kg can be produced. All parts are fully weldable and can be heat-treated. The most common welding processes are WIG, MIG and Laserwelding.
Castings produced in AlSi usually need heat treatment to get higher mechanical properties. To avoid this cost-intensive production step, Alcoa developed the alloy C446 which shows comparable properties to AlSi9Mg without heat treatment.
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Die Casting Cell
Die Casting Machine
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