The basis for the die casting process is using high pressures to inject molten metal into a reusable steel die. There are some variations to the process, such as: hot chamber die casting and cold chamber die casting. At HUI HWA cold chamber machines are used for aluminum alloys.

In conventional die casting process, the gas entrapping is almost impossible to be eliminated due to molten metal being forced into the cavity at high pressure. Vacuum assisted die casting is a process to assist with preventing the air from getting trapped between the injection sleeve and die cavity. With the use of vacuum system, which is able to maintain vacuum in the cavity until the completion of the injection process so the cavity gas can be exhausted through a chill vent with a vacuum pump.

Pore-free (PF) die casting is another effective process to reduce the gas porosity in castings. In this process, the air in the mold and sleeve is replaced with active oxygen, and reaction of the active oxygen and molten aluminum form a vacuum in the mold and sleeve.

Die casting tooling can be expected to last at least 90,000 shots, but often lasts 100,000 shots or more.

We have the ability to cast parts weighing up to 4kg or up to 122,500 mm² of projected area.

We consider ourselves a one-stop shop for all your die casting needs. At HUI HWA we perform mold design, tooling, die casting, machining, testing, assembly, and more.

Die casting machine sizes are given in tons (or metric tonnes). This refers to the clamping force, holding the dies halves together, when the machine is closed.

Minimum wall thickness varies by the size of the area or the part. However, an average part usually ranges from 1.5mm to 3.0mm, though for some parts in certain areas it can be as low as 0.8mm.

Draft is a small angle or amount of taper or slope added to cores or other parts of the die cavity to permit easy ejection of the casting from the casting die. The draft requirement is not constant and will vary with the specific surface, the depth of the surface, the type of wall specified, and the alloy selected in casting. 1-2 degrees is typically sufficient to allow the casting to release from the die without dragging or distorting.

Die casting dies are made of alloy tool steels in at least two sections called fixed die half and ejector die half. Dies are classified as: single cavity, multiple cavity, combination and unit dies.

HUI HWA has established a solid network of long-term strategic partner to offer sand blast, vibratory deburring, polishing, anodize, conversion coating, powder coat, E coasting, and electroless nickel plating. In addition, we also offer assembly, pressure testing, impregnation, and material certifications.