Abstract
Abstract
Pressure pulses and transients are common problems in hydraulic circuits. They create specific problems with component accuracy in hydraulic circuits of die casting machines. In these machines, the molten metal is injected into dies and a subsequent pressure boost fills all cavity details, improving the component quality. Pressure pulses during this stage result in elastic deformations within the die and cause inaccuracies of components. The pressure pulses are caused by inertia forces of decelerating hydraulic motors. There is therefore a trend to reduce these forces by reducing the masses (including masses of hydraulic fluid) involved. Detailed mathematical modelling of the circuits in the time domain allows assessment of the magnitude of pulses even in the design stage and therefore the assessment of this aspect of the design.