Hot Chamber vs. Cold Chamber Machines
The distinction between hot chamber and cold chamber die casting for manufacturing is that cold-chamber has the molten metal pushed into the die from an external source. The metal is heated and turned into molten metal outside the die cast machine. Hot chamber machines the metal is melted in the machine. Since the metal is melted inside the machine, certain parts of the machine have constant contact with the molten metal, therefore, metals with high melting temperatures are not typically cast with hot chamber machines. Cold chamber machines are able to operate much cooler since the molten metal is brought in from an outside source. However, higher production rates are possible using hot chamber machines since the metal does not have to be delivered from outside the machine.
Hot Chamber Die Casting Process
Hot chamber die cast, also called gooseneck casting, is more common than cold chamber die casting. Hot chamber casting machines use a hydraulic or pneumatic powered piston to force the molten metal heated within the machine into the die. Once the molten metal has filled the goose neck, the piston then pushes liquid metal into the die. The injection mechanism is fully immersed in the molten metal. The clamping force used to inject the metals ranges from 400 tons to 4000 tons. One advantage this process has over cold chamber is the fast cycle times, which can be only a few seconds depending on the size of the part. Since the injection mechanism is immersed in the molten metal, the mechanism is prone to corrosion. Due to this, hot chamber process is best suited for low temperature casting alloys such as lead, magnesium, zinc and copper. This method has fast cycle times, which can be as low as seconds when producing small parts.
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Model D-250-Z, 250 Ton Hot Chamber Die Casting Machine Factory Rebuilt by HPM
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Techmire 44H CSS-01 four-slide Hot Chamber miniature Zinc 4x4 die casting machine
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Techmire 44H CSS-01 four-slide Hot Chamber Zinc 4x4 die casting machine
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Techmire 44 NTXR four-slide Hot Chamber Zinc 4x4 die casting machine
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Multi-Slide aka Four Slide
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Techmire 44H CSS-01 four-slide Hot Chamber miniature Zinc 4x4 die casting machine
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Techmire 44H CSS-01 four-slide Hot Chamber Zinc 4x4 die casting machine
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Techmire 44 NTXR four-slide Hot Chamber Zinc 4x4 die casting machine
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A significant advantage of the hot chamber die casting is extremely short cycle times, since the metal is heated and liquified inside the hot chamber machine. Unlike cold chamber machine where the molten metal is heated outside the cold chamber machine and needs to be ladeled into the die cast machine. The hot chamber die casting process is most commonly used for metals that have a low melting temperature, such as zinc, lead and magnesium. Extremely fast cycle times can be achieved when casting zinc and zinc alloys, as complex parts can be cast with little or no secondary processes. Cycle times as fast as 1000 cycles per hour can be achieved with hot chamber process. Since the metal has a low melting temperature, chill time is reduced, resulting in faster cycle times. Hot chamber machines can be fully automated, thus reducing labor costs.
Hot chamber die cast machines are used to cast low temperature metals such as magnesium, lead, zinc and copper based alloys. If you are not sure which process is best for your application, contact the knowledgeable staff at Die Cast Machinery LLC. We will be happy to assist you in your search for die cast equipment.
Die Cast Machinery, LLC is the global leader in procurement and sale of second hand hot chamber die casting machines. If it exists in the world of die casting we have it or can find it. We offer comprehensive services which include: facility appraisals, financing, plant liquidations and sales of ongoing businesses. We are a service orientated company that is dedicated to help you find the right machine for your application and budget offers used, second hand high pressure die casting machines in cold chamber and hot chamber configurations.
Major machine builders for the hot chamber die casting process includes: Italpresse, Frech, Idra, Techmire, Urpe, Prince, Hishunime, HPM and LK.