High Pressure Die Casting Vs. Low Pressure Die Casting

Update:Jul 13 2017

One half of the high pressure die casting mold is conne […]

One half of the high pressure die casting mold is connected to a fixed machine plate and the other half is connected to a movable machine on a horizontally aligned die-casting machine. Due to the pressure used when pouring up to 1,200 bar - the two ends of the mold together with the bolt must have a high locking force. Because these melting points are relatively high, so the cold chamber die casting machine is mainly used for aluminum alloy. Here, the casting assembly is located outside the melt. The molten metal is supplied to the ejection chamber, and the piston drives the metal into the mold. Once the metal has cooled and solidified, the two halves of the mold are opened and the casting is automatically discharged from the mold through the thimble.

As with high-pressure die-casting, half of the mold is also attached to the fixed and moving machine board, but the machine is vertically aligned. The holding furnace for the molten metal is located below the fixing plate. Apply a maximum pressure of 1 bar to the furnace to push the molten metal up through the air inlet into the mold cavity, although the sand mold is also possible. The upward movement of molten metal against gravity. After the mold is filled, when the metal is cooled, the pressure is maintained so that additional molten metal can be added to resist any volateness with the metal from the molten state to the solid state. This naturally ensures as much as possible from top to bottom curing.

In engine technology, low-pressure die-casting can use a sand core to achieve a so-called closed deck design for an engine block - which means that the openings in the cylinder block surface of the engine block previously required in the die casting are used for the mold cooling jacket Contour, not required during low pressure die casting. This makes it possible to produce more rigid engine blocks; together with improved material properties, this reduces weight and improves performance - making a significant contribution to reduced size. The same technique applies to structures and components used in chassis, where large frame components can be hollowed using sand cores, thereby significantly reducing component weight.