The Basics of Cold Chamber Die Castings. Cold chamber die castings are a process of die casting that use, instead of a hot chamber, a cold one. When starting the process, the molten metal is taken from the crucible and then inserted into a shot sleeve. Afterwards, a hydraulically operated plunger pushes the molten metal into the die. In order to minimize the shrinkage that usually occurs during silicification, as many material as possible is forced into the die cavity. Injection pressures usually have to reach over 10,000 psy or 70,000 KPa in order for the machine to function the way it should.
Cold chamber die castings are usually needed when the alloy is not eligible for use in hot-chamber machines for a variety of reasons. Such metals that require the cold chamber include aluminum, copper, zinc and magnesium alloys. Beforehand, the materials must be melted using a furnace. The problem with using cold chamber zinc die castings is that the cycle time is a lot slower, since the molten metal needs to be transferred to the cold-chamber machine from the furnace.
When die casting, the dies needed are made out of steel because typical cast iron cannot take high pressures. This can serve as another setback to using the cold chamber, for the dies end up being very expensive, since steel is a costly metal. The dies can contain multiply cavities, or just one mold cavity, and there must be two dies – one for separation, and one for ejection of the final product. Many kinds of cold chamber machines are available with various features, but all of them function at maximum efficiency.
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