Metal - Die Casting

Die casting is a manufacturing process for producing accurately dimensioned, sharply defined, smooth, or textured-surface metal parts. It is accomplished by forcing molten metal under high pressure into reusable metal dies. The process is often described as the shortest distance between raw material and finished product. The term “die casting” is also used to describe the finished part.

Customer Benefits

Die casting is an efficient, economical process offering a broader range of shapes and components than any other manufacturing technique. Parts have a long service life and may be designed to complement the visual appeal of the surrounding part. You can use machining on a die-casting part to create tighter tolerances or create features on the part that cannot be die cast

High Speed Production

Complex shapes within closer tolerances than many other mass production processes. Little or no machining is required and thousands of identical castings can be produced before additional tooling is required.

Dimensional Accuracy and Stability

Die casting produces parts that are durable and dimensionally stable while maintaining close tolerances. They are also heat resistant.

Strengh and Weight

Stronger than plastic injection moldings with the same dimensions. Thin wall castings are stronger and lighter than those possible with other casting methods.

Multiple Finishings Techniques

Die-cast parts can be produced with smooth or textured surfaces, and they are easily plated or finished with a minimum of surface preparation.

Simplified Assembly

Die castings provide integral fastening elements, such as bosses and studs. Holes can be cored and made to tap drill sizes, or external threads can be cast.

How are Die Castings Produced?


Preparation and clamping of the two halves of the die.


The molten metal is next transferred into a chamber where it can be injected into the die.


When the entire cavity is filled and the molten metal solidifies by cooling, the final shape of the casting is formed.


Die halves can be
opened and an ejection mechanism can push the casting out of the die cavity.


During cooling, the material in the channels of the die will solidify attached to the casting.

The Machines

Hot Chamber Machine

Used for alloys with low melting temperatures, such as zinc, tin, and lead. The temperatures required to melt other alloys would damage the pump in direct contact with the molten metal.

die casting machine hot chamber
die casting machine cold chamber

Cold Chamber Machine

Used for alloys with high melting temperatures that cannot be cast in hot chamber machines because they would damage the pumping system. Such alloys include aluminum, brass, and magnesium.

Cold chamber machine VS Hot chamber machine

Materials UsedAlloys – Aluminum, Brass, CopperAlloys – Zinc, Copper, Magnesium, Lead
TemperatureMaterials with high melting pointsMaterials with low melting points
ChamberCylindrical Sleeve-Automatic-Hand LadleGooseneck
Closing SystemHydraulically Operated PlungerPlunger

Pre Treatments

Shot blasting

Technique is carried out by imparting the part surface using certain abrasive materials for preparing its surface. Used for surface preparation before the part is subjected to other operations like anodizing, painting, etc. Shot blasting can considerably improve the durability and longevity of the part.

die casting shot blasting
die casting pre treatments


To deliver a die cast part with nice smooth surfaces, without dividing lines or other defects, ready for surface finishes. Grinding.

Post treatments

Black Hard Anodizing

The only available anodizing method for aluminum die casting parts. The corrosion resistance of the surface is greatly improved. This finish is highly recommended for the casting of outdoor applications.

Powder Coating

Used not just as a surface decorative, but also to improve the surface corrosion resistance of the casting products. This process shields even the toughest and roughest machinery from corrosion.

Painting & Stoving Varnish

Painting is usually used for surface prevention and decoration, whereas stoving varnish is comparatively an expensive process and it is mainly used for decorative die casting parts.

Mirror Polishing

Brushing is used for the decoration of die cast products. Polishing is actually a necessary process that needs to be performed before any other surface treatment methods including stoving varnish, electroplating, or powder coating.


Any questions?

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