What is low pressure die casting?​​

Low pressure dies casting is a special new casting process, which is a new casting process between pressure casting and gravity casting. Low pressure dies casting is a casting method in which liquid alloys are slowly pressed into the mold cavity from bottom to top under the action of low pressure, and solidified under the action of low pressure to obtain castings.​​

👉Advantages of low pressure die casting

• The biggest advantage of low pressure die casting over high pressure die casting is the reduction in porosity.

• Especially the wall thickness part. Because there are no runners, risers, or gates, the casting efficiency is 90~95%. Few of the slag chips need to be remelted, which saves the cost of the fuel needed to melt the metal, such as low pressure die casting alloy wheels.

• The mold life is longer than that of metal mold casting, and the mold cost is lower than that of high-pressure die casting.

• Low pressure dies casting is available for more alloys.

• Mechanical characteristics can be improved due to the use of heat-treated alloys and reduced air entrainment.

👉Disadvantages of low pressure die casting

Low pressure die casting is less productive than high pressure dies casting and is generally not suitable for casting smaller parts, poor surface finish and size range, larger minimum wall thickness, shorter die life than high pressure die casting, and tooling costs higher than metal mold casting.

High pressure die casting

High pressure dies casting or die casting means that the molten metal is pressed into the steel mold at high speed during die casting, thereby ensuring that the molten metal is completely injected into the cavity space between the two half-molds. As the molten metal enters the mold, heat flows out of the metal and into the mold, the metal cools, and when fully cooled, the mold is opened and the cooled casting is removed.

👉Two different mechanisms:

The "cold chamber" mechanism is that metals are melted at high temperatures, and molten metals such as aluminum, brass, and magnesium have an affinity for iron. In the cold room process, there are two types of injection systems, horizontal injection, and vertical injection.

"Hot cell" mechanisms are commonly used in zinc and lead metals, which are melted at low temperatures and have a reduced affinity for iron.

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High pressure dies casting is the process of forcing molten metal under pressure into a mold cavity that has been securely locked. Strong pressure is maintained in the mold cavity until the metal in the mold cavity cools down. After the metal cools down, the mold is opened, and the casting is ejected and taken out. After the casting is taken out, the mold is lubricated, the mold is closed and locked, and the process is ready for the next cycle.

👉Advantages of high pressure die casting

• The productivity of high pressure die casting is much higher than that of a metal die casting or low pressure die casting.

• Castings are produced with tight dimensional tolerances, greatly reducing machining operations.

• Die casting has a good surface treatment, which is also a basic requirement for electroplating.

• The wall thickness of the die casting can be made thinner, which greatly reduces the overall weight of the casting, and the longer die casting tool life reduces the cost of a single piece.

• In the die casting operation, more complex parts can be produced, thus greatly reducing the number of parts in the assembly, and insert casting can be inserted in some places in high-pressure die casting.​​

👉Disadvantages of high pressure die casting

• High tooling costs make short-run production in small quantities uneconomical.

• The limited number of alloys suitable for die casting production and the internal porosity of the castings limit the heat treatment or joining of complete castings.

In the end

The above content is about the advantages and disadvantages of high pressure die casting and low pressure die casting, hope that it can give you some references. We are a leading low pressure die casting machine manufacturer, if you want to order low pressure die casting aluminum or other die casting parts, we are sure we are your best choice.