Low Pressure Die Casting

Low-pressure die casting uses small pressure, typically around 20-100 kPa (2.9-14.5 psi), instead of gravity to fill a die. Unlike the traditional die casting process, it has a unique setup and uses several pieces of equipment. Below is an illustration of the setup and pieces of equipment that are needed.

The process begins with a melting furnace which melts the metal alloys and brings them to the casting temperature. For example, aluminum has a casting temperature of 710-7200C.

The molten metal will then go to a holding furnace below the mold, which functions as a container while maintaining the liquid at the casting temperature.

Low pressure forces the molten metal through a riser tube into the mold. The liquid metal moves under constant pressure until the molten metal solidifies in the die cavity.

On solidification, the pressure is released, and the remaining molten metal goes back through the riser tube to the holding furnace for recycling. Finally, the casting will be easily removed once the mold is cooled.

Aluminum Low Pressure Die Casting(LPDC) Examples:

The advantage of low pressure die casting comparing high pressure die casting:

• Better casting quality and mechanical strength
• Significant lower tooling cost
• Flexible for engineering changes.
• Flexible for production without MOQ issue
• Strength can be further improved by heat treatment(T6)