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DIE CASTING is one of our core businesses, and one in which CHK has demonstrated excellence since its introduction. We specialise in product design, material selection, tool design and competitive pricing, coupled with the ability to produce both long and short production runs.
Our design team frequently works in partnership with leading Industrial designers and has a proven track record in the timely completion of numerous development projects.
We offer a full supply chain management facility coordinated by our project management team and experienced engineers in Hong Kong.
We would welcome enquiries on any of our Die Casting and would be delighted to discuss your requirements. Please see the Contact Us section for our up-to-date contact details of our worldwide offices.
About Die Casting
The process cycle for die casting consists of five main stages, which are explained below. The total cycle time is very short, typically between 2 seconds and 1 minute.
Clamping
The first step is the preparation and clamping of the two halves of the die. Each die half is first cleaned from the previous injection and then lubricated to facilitate the ejection of the next part. After lubrication, the two die halves, which are attached inside the die casting machine, are closed and securely clamped together.
Injection
The molten metal, which is maintained at a set temperature in the furnace, is next transferred into a chamber where it can be injected into the die. Once transferred, the molten metal is injected at high pressures into the die.
Cooling
The molten metal that is injected into the die will begin to cool and solidify once it enters the die cavity. When the entire cavity is filled and the molten metal solidifies, the final shape of the casting is formed. The die can not be opened until the cooling time has elapsed and the casting is solidified. A greater wall thickness will require a longer cooling time.
Ejection
After the predetermined cooling time has passed, the die halves can be opened and an ejection mechanism can push the casting out of the die cavity. The ejection mechanism must apply some force to eject the part because during cooling the part shrinks and adheres to the die. Once the casting is ejected, the die can be clamped shut for the next injection.
Trimming
During cooling, the material in the channels of the die will solidify attached to the casting. This excess material, along with any flash that has occurred, must be trimmed from the casting either manually via cutting or sawing, or using a trimming press.
