Hot Casting

Introduction of Die Casting

Die casting is a metal casting progression that makes metal parts such as vehicle engine cylinders by forcing molten metal under high pressure into a mold cavity.

The molds used on die casting have been made by specific shapes and would be strong and hardened tool steel which is the combination of carbon steel and alloy steel, usually non-ferrous metals, specifically zinc, copper, aluminum, magnesium, lead, pewter, and tin-based alloys. It would depend on what the die casting technique is chosen.

Products made by die casting technique are usually simple in structures because the complexity of the dies and the types of metals used during the process would be the main part of die casting. That is, if the structure of the die is complex, it would take more progress to make the die the first or buy it at a higher price, which would in some level increase the capital cost.

Die casting can be divided into hot chamber die casting and cold chamber die casting. Hot chamber die casting is famous in casting small parts and metals with low melting points. On the contrary, cold chamber die casting is responsible for the task that is done by hot chamber die casting.

At first, the vehicle manufacturing industry firstly adopted the die casting technique as a part of producing progressions. Now, die casting has been widely used in various fields like agricultural machinery, machine tool industry, electronics industry, national defense industry, computers, medical equipment, clocks cameras, daily hardware, etc.


Introduction of Hot Casting

Hot casting, which is also known as hot chamber die casting, is one of the casting techniques that is recognized useful in dealing with small parts and metals with low melting points. As the casting technique that is able to shorten and simplify the producing cycle, hot casting is widely used when mess producing is in demand, if the products do not require complex structures.

Usually, hot chamber die casting is used on metals with low melting points such as zinc, magnesium, lead and other low melting point alloys that do not readily attack and erode metal pots, cylinders and plungers. As for metals with high melting points, they would be dealt with by machines work according to the cold chamber die casting technique.


Work with Gooseneck Machine

The equipment used to apply hot chamber die casting is called a gooseneck machine. It relies upon a pool of molten metal to feed the die. Working progress of hot chamber die casting is simple and has only four steps to complete. When the casting cycle starts, the piston in the machine would be retracted to let the molten metal fill in the gooseneck. After that, the piston, usually pneumatic or hydraulic powered, would start to work and force the metal from the gooseneck through injectors into the die. When the molten metal is solidified in the die cavity, the plunger would be withdrawn to open the die and let the casting to be ejected. Then, the whole producing process would be done.


Pros and Cons of Hot Chamber Die Casting

Hot chamber die casting has been applied in not only metalworking industries but also in various fields for decades because of its properties that can finally lead to convenience and cost reduction. Because of the dies which have decided the structure of the finished goods, products made with this technique can have almost no allowable errors and the quality would steadily stay in the balance. Below are some advantages that hot casting might have:

Shorter Cycle Time
The casting cycle of this machine is short, approximately 15 cycles per minute, which can increase the productivity and is suitable for mess production.

Directly Melting in the Same Machine
Metals can be molten right in the gooseneck machine while applying hot chamber die casting. This provides convenience that the operators do not need to melt the metals elsewhere and transfer them from other equipment to this machine.

High Productivity
The biggest property hot chamber die casting can provide is producing with a high speed and in a large amount. Since the production cycle is short, the technique can offer more quantity of products than other machine tools can.

Although the benefits of hot chamber die casting are attractive, it is not almighty that it cannot be applied on metals with low melting points. For example, aluminum is not an ideal metal to be progressed with hot chamber casting because it would bring the iron out from the molten pool that might hurt the machine itself.

However, aluminum is a popular raw material for manufacturing products to be used in various industries. When faced with the situation that aluminum is needed to be used as a casting material, another type of die casting, the cold chamber die casting, would be chosen as an alternative.

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