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Pressure control

Visualization and control of the pressure curve

Heart and soul of KURTZ Systems: The pressure control

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 mould filling.

The KURTZ pressure control prevents pressure fluctuations, which otherwise would cause the metal pillar to vibrate in the mould. A fluctuating metal pillar again leads to inclusions of shavings in work pieces, to the formation of cold currents and is therefore synonymous with refuse. Furthermore, in closed moulds, cracks with changing of pressures during the filling process are normally invisible and thus unknown. The KURTZ low-pressure control offers a solution.

A pressure control with proportional valve technology provides for gentle transitions between the different pressure rates. These different mould filling rates are required to be able to cast parts with varying wall thicknesses. The influence of different pressures in mould filling becomes especially clear with low-pressure casting in open moulds. Contrary to closed moulds, which create a counterpressure through different ventilation conditions during mould 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 realtime visualization of all process parameters via LCD display, a permanent process data capture and thereby an ISO conforming reproducibility complete the key total concept.