Cold Chamber Die Castings – How it Works. Aluminum die casting is often compared to permanent mold casting, a process in which metal injection is done on mold that is placed under high pressure. A lot of times, the results are similar dies that are perfectly furnished with fine texture and precise measurements. Some companies may also opt to go through post-machining to ensure the accuracy of all dies produced after the entire process. One of the most effective ways to execute aluminum die casting is through cold chambered machines.
Cold chamber die castings are done with molten metal that is accurately measured into the main chamber as the alloy is injected. The good thing about this process is that there is less time for the molten metal to be fully exposed on the plunger. Since aluminum is sensitive to high temperatures due to possible harm in the pumping system, cold chamber die castings help even out the process. In cold chamber die castings, a holding pot is kept open to pour in the molten metal so as to neutralize the temperature of the material. Instead of pumping the molten metal once it is placed inside the holding pot, this is ladled through the shot chamber by use of a pouring hole. Unlike in hot chambered die casting, a gooseneck channel is not needed during metal injection. The plunger can easily aid in moving the molten metal into the shot chamber to form the die in the injection sleeve. Once the die has transformed into its solid state, this can now be used as an efficient component for the die casters’ client.