Hot chamber vs cold chamber (Die casting)
High pressure die casting (HPDC) is where liquid metal is infused under exceptionally high pressure into premium steel molds (dies on) so as to make high precision die cast products. The die is intended to cast designed shapes and complex features with extraordinary accuracy and consistent replication.
There are two types of HPDC which Chicago White Metal gives: hot chamber die casting and cold chamber die casting. Despite the fact that there are a few similarities between the two sorts, they exist independently for various purposes.
Hot Chamber Die Casting
Hot chamber die casting is a sort of die casting that utilizations alloys with low melting temperatures (for example Zinc, some Magnesium compounds). Utilizing alloys with high melting temperatures would result in harm to the gooseneck, nozzle and other parts.
In a hot chamber die casting machine, the fixed die half is known as a cover die, which is mounted to a stationary platen (enormous plate to which each pass on half is mounted) and lines up with the nozzle of the gooseneck. The movable die half is the ejector die and is placed to a movable platen, which slides along tie bars.
The metal is contained in an open holding pot, which is set in the furnace and dissolved to the required temperature. At the point when the plunger is in the "up" position, the liquid metal streams into the shot chamber. As the plunger descends, it powers the liquid metal through a gooseneck and into the die at injection pressure ranging from 1,000 – 5,000 psi.
The machine pushes the moving platen towards the cover die and holds it shut with great pressure until the liquid metal is infused. The plunger stays in the "down" position to hold the pressure while the throwing "cools off." After hardening, the plunger is retractedand the cast part is either ejected, physically expelled from the machine or pushed off the cover die. This ejection framework, which incorporates an ejector die on and ejector pins, enables the casting to be pushed out while discharging the the die halves.
Cold Chamber Die Casting
Cold chamber die casting is a kind of die casting that is utilized for alloys with high melting temperatures (for example Aluminum and some Magnesium alloys).
As a difference from hot chamber die casting (puming liquid metal into the machine), liquid metal is ladled from the furnace into the shot chamber through a pouring hole. While the general capacity of the cold chamber machine is like hot chamber, cold chamber works with a flat direction and does not have a gooseneck Instead, the plunger forces metal through the shot chamber into the die at pressure ranging from 2,000 and 20,000 psi. The plunger holds the weight and withdraws after solidification. The clamping unit and mounting of dies is set up equivalent to hot chamber, anyway the cover die for a cold chamber machine does not have a gooseneck or nozzle, and in this manner adjusts straightforwardly from the shot chamber.