Hot and Cold Chambers in Die Casting

Die casting is a manufacturing method that could make geometrically complicated metal parts using reusable molds, called dies. The die casting process entails using a furnace, metal, die casting machine, and die. The metal, ordinarily a non-ferrous alloy such as aluminum or zinc, is melted in the furnace and after that injected into the dies in the die casting machine. You will discover two key sorts of die casting machines – hot chamber machines (made use of for alloys with low melting temperatures, for instance, zinc) and cold chamber machines (applied for alloys with higher melting temperatures, such as aluminum). In both machines, soon after the molten metal is injected into the dies, it swiftly cools and solidifies into the final part, named the casting.

Overview of Hot-Chamber Die Casting

Hot-chamber die casting uses precisely a method where molten metal is forced using applying stress to the cavity of a pre-shaped mold. The defining characteristic of hot-chamber die casting is that metal is heated inside the casting machine rather than a separate machine or furnace.

Also called goose-neck machines, hot-chamber casting machines feature a built-in furnace in which metal is heated to attain a molten state. They use a hydraulic-powered piston that forces molten metal out of the furnace and into the die. Hot-chamber die casting is actually a relatively rapid course of action, using a standard cycle lasting just 15 to 20 minutes. When not suitable for metals having a higher melting point, it’s perfect for zinc alloys, tin alloys, and lead alloys.

Overview of Cold-Chamber Die Casting

Primarily based on its name, you could assume that cold-chamber die casting entails forcing cold metal utilizing the cavity of a mold, but this isn’t necessarily true. Cold-chamber die casting still demands the usage of molten metal that’s forced into a mold. The distinction among these two processes is that hot-chamber die casting heats metal inside the casting machine. In contrast, cold-chamber die casting requires heating metal in a separate furnace and then transferring the newly molten metal into the casting machine.

With cold-chamber die casting, metal is initially heated to achieve a molten state in a separate furnace. The molten metal is then transported towards the die casting machine, exactly fed into the machine’s chamber. The machine uses a pressurized plunger to force the molten metal into the cavity from the mold.

Certain types of metals can only be processed by making use of cold-chamber die casting. The high temperatures expected to achieve a molten state for metals, for example, aluminum, magnesium, and copper imply a separate furnace has to be utilized. That is why some makers pick cold-chamber die casting over hot-chamber die casting.