Low-pressure casting process - controlled mould filling, controlled solidification, high efficiency
Low-pressure for metal dies (l.), Low-pressure for sand packages (r.)
The low-pressure casting process proves itself to be predestined for the conversion of exceptionally high quality demands. In low-pressure casting, the furnace is pressurized
whereby the molten aluminum is brought into the casting die through the riser tube. The die is filled by slowly climbing, controlled, and above all, constant pressure. The laminar filling process avoids the formation of oxidation, the onset of cold currents and the danger of air inclusions.
The freezing proceeds then from the furthest point of the mould to sprue. During freezing, the furnace pressure is maintained and thus ensures feeding of the castings. Through casting, technical measures and the directed use of the die cooling, the ideal of a vectored freezing is reached.
With the feeder box KURTZ offers a previously unknown flexibility in casting and feeding of parts by means of the low-pressure casting process - independent from the part contour and without additional heat supply. As the number of gating systems and feeders is not limited, several smaller gatings can be positioned in different spots at the casting in order to further reduce cycle times.
Further proven option is the use of several riser tubes.
A further advantage of low-pressure casting lies in the reduction of returns. This is impressively demonstrated in the example of a compressor housing. With lowpressure casting, one can count on considerably lower costs for cleaning, rework, and re-melting of returns.
Comparison of the gravity and low-pressure casting process, reduction of returns:
before: part weight: 21,3 kg, output: 54 %; after: part weight: 12,2 kg, output: 92 %
Besides, as a rule the output is increased, because the process is better reproducible and less dependent on external influences. No matter whether a classical, rather rotationally symmetric part, or components that require a more complex gating system, is cast: KURTZ always offers the fitting solution for low-pressure casting.
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