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How Does Hot-chamber Die Casting Machine Work


Hot-chamber die casting machine is a kind of die-casting machine with a high degree of automation, less material loss, and higher production efficiency than the cold-chamber die-casting machine. It is suitable for die-casting zinc, lead, and other low-melting non-ferrous alloy parts and can be widely used in automobiles and motorcycles: accessories, instruments, household hardware, household appliances, and other industrial sectors.
Working principle of hot chamber die casting machine:
When the shot hammerhead rises, the molten metal in the crucible enters the pot press chamber through the pot inlet. After the mold is closed, the molten metal fills the die casting cavity from the nozzle head along the channel after the hammerhead is pressed down. Medium solidification molding, the injection hammerhead rises, the mold is opened to take out the casting, and a die-casting cycle is completed.
The injection chamber of the hot chamber die-casting machine and the injection punch are immersed in the molten metal. The injection chamber is connected with the gate of the die-casting mold through a gooseneck tube.
The structure of the hot chamber die casting machine:
The hot-chamber die casting machine is mainly composed of four parts: mold clamping device (also called mold clamping device), injection device, hydraulic transmission system, and electrical control system.
The mold clamping device mainly plays the role of closing and opening the mold, locking the mold, and ejecting the product. It is mainly composed of a fixed seat plate, a movable seat plate, a tie rod, a mold clamping hydraulic cylinder, an ejection mechanism, a mold adjustment device, and a safety door.
The hydraulic transmission system is a system that transmits power through various hydraulic components and circuits to realize various action programs. It is mainly composed of hydraulic pumps, lock/open mold hydraulic cylinders, thimble hydraulic cylinders, buckle nozzle hydraulic cylinders, and injection hydraulic cylinders. , Various control valves, accumulators, oil tanks, coolers, hydraulic oil, etc.
The electrical control system is to ensures that the machine works according to the predetermined pressure, speed, temperature, and time. It is mainly composed of a motor and various electrical components, meters, and electrical circuits.
Features of hot chamber die casting machine:

  • Die-casting of low-melting-point alloys is usually the main method, and zinc alloy is the most typical one; 

  • It is suitable for the production of small die-casting parts, while hot-chamber die-casting is not suitable for medium and large-scale die castings; 

  • The molten metal filled into the mold cavity always flows in the closed channel, and the oxidized inclusions are not easily involved, which is more beneficial to the quality of the die casting;

  • The automation of die-casting process is easy to realize;

  • Since no pouring procedure is required, the production efficiency is higher under normal operation; 

  • The injection pressure is slightly lower, and there is no pressurization stage in the injection process, but it has little effect on small and thin-walled parts; 

  • The life of hot work parts such as injection punches, pouring pots, nozzles, etc. is difficult to grasp and control, and it takes time to replace after failure;

  • When replacing or repairing the furnace, it is necessary to disassemble and assemble hot work parts, which increases the auxiliary time;

  • For the hot chamber die casting of high melting point alloys, magnesium alloy is still more suitable at present, and the hot chamber die casting machine used for magnesium alloys also has the above-mentioned characteristics.

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