Low pressure: 2 have
Low pressure casting is a well-known casting process. In particular, most aluminum wheels is manufactured by injection molding low pressure. By contrast injection high pressure of this method uses a pressure of only about 2 have.
Filling the mold accelerate through by feeding in compressed air holding furnace. The melt is fed upward along the tube profitable, which is submerged in the melt depth. This provides a smooth filling of the mold and the melt cleanliness. After that, as a mold filled, opposite the lucrative part starts solidifying metal. air pressure control in the holding furnace ensure complete filling of the mold. molding cycle is quite long due to the fact, that during the whole time casting solidification linked through profitable pipe with a large volume of melt in the furnace.
Molding automotive parts under low pressure
Casting, low pressure cast, for example, large V-shaped automotive engine cylinder blocks of hypereutectic aluminum alloys, Cylinder head and engine motorcycles.
Machine for low-pressure casting
The mold usually has channels, through which is passed water or compressed air. This makes it possible to control the temperature of cooling conditions during solidification.
Directional solidification and pressurizing provide small volumes profitable part of the casting, a, so, less metal waste goes to remelting. In normal, gravity chill casting yield can be only 50 %, while for low-pressure casting it is about 90 %. This effect is shown in Figures 5 and 6: in injection molding, the profitable part is much smaller, than at chill casting.
Low pressure die casting machine includes:
- sealed holding furnace,
- Equipment for feeding and compressed air control,
- hydraulic crane for the installation and removal of molds.
Usually the machine for low-pressure casting works with one mold.
A source: European Aluminium Association, 2002