High pressure magnesium die casting permits economical quantity production of casting at a quick rate. These casting can compromise of different screw threads, holes, recesses, and are characterized by a top dimensional accuracy and best surface finish. They permit best economy of metal and need little or no surface finishing. The principal of which force die casting is based, consists of forcing molten metal into a die or the mold, under considerable force. The machines which are used for this objective on 1 or 2 systems:
- Hot chamber machines
- Cold chamber machines
In the warm chamber machines the metal is kept liquid in a crucible within the machine, and the force chamber that delivers the metal into the die is placed in the metal bath. This machinery can be pneumatically operated, or more generally developed the force by the action of a ram. The casting metal for a chill chamber machine, is kept liquid in holding furnace, from which it is transferred to the force chamber, by means of a scoop or a unique mechanical device and is forced into the die by the means of a ram. Some easy machines are hand run, but completely mechanical machines are more generally employed for high rates of production.
In pressure magnesium diet casting, precision made dies of complex multipart design and therefore extremely expensive are used, and exposed to extreme working situations, by high forces and high successive variations in temperature. For the production of zinc alloy and zinc casting the dies may be made of unalloyed steel, anyway for copper, aluminum, magnesium, and the alloys of these metals, the dies are generally made of warm-work steel, which has much bigger durability.
Another development in high pressure magnesium die casting is vacuum diet casting. It generates castings which have an even excellent finish than ordinary top force castings. There are 2 systems, the die is either enclosed in a hood which evacuates the air, or the holding furnace is installed within the casting machine, so that on the evacuation of the air from the die, the metal is sucked into the die and is compacted in it, and a process for producing iron casting based on this rule has been developed.
- Amazing dimensional accuracy
- Reduces or eliminates secondary machinating operations
- Quick production rates
- It has the capability to deliver hard shapes with top level of tolerance
- Identical casting can be big-produced in 1000s before you are needed to include any new casting tools.