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. One fundamental requirement which has to be met, however, is a controlled and uniform pressure increase to achieve uniform mold filling.
The Kurtz pressure control prevents pressure fluctuations, which otherwise would cause the metal pillar to vibrate in the mold. A fluctuating metal pillar again leads to inclusions of shavings in work pieces, to the formation of cold currents and is therefore synonymous with scrap. Furthermore, in closed molds, cracks with changing of pressures during the filling process are normally invisible and thus unknown. The Kurtz low-pressure control offers the perfect solution.
A pressure control with proportional valve technology provides for gentle transitions between the different pressure rates. These different mold filling rates are required to be able to cast parts with varying wall thicknesses. The influence of different pressures in mold filling becomes especially clear with low-pressure casting in open molds. Contrary to closed molds, which create a counter-pressure through different ventilation conditions during mold filling, the metal level lies open in casting in core packages and thus reacts to the smallest pressure changes. Thereby, the quality of the casting process is clearly improved.
The real time visualization of all process parameters via LCD display, a permanent process data capture and thereby an ISO conforming reproducibility complete the key total concept.