Cold Chamber Die Casting

Cold Chamber Die Casting Process Guide

Some large size cast parts required for heavy industrial equipment components and countweight, these large sized die casting components are made with cold chamber die casting machine, similar with aluminum die casting process. The cold chamber die casting process runs the below steps one by one.

Step 1: Mold Preparation

• The precise mold & die has a higher intial fabrication cost, and ensure a longer life time of it, and preheated and avoid cold shut and flow trace of cast part occurred.

• Die Release agent is sprayed after each cast cycle finished, and ensure the cast part ejected smoothly each time. Keep the halves of the mold is alignment with each other, and makes ejector pins eject the cast part from the core of the mold.

Step 2: Melting & Pouring

• Melting these high melting points metal with high volume heat energy, and overflow the impurities within the metal, maintain the steady temperature molten metal in reservior. And have a sufficient preparation for pouring the molten metal.

• When molten metal is manually or automatically ladled, and poured into the cold chamber shot. This is mechanical action, replace labor operation, reduce some accidents for scald.

Step 3: Injection

• The hydraulic or mechanical plunger forces the metal into the die cavity at high pressure, and fill the metal into the die fully quickly. These high melting points metal have a good fluidity, and forms high accuracy dimensions and fine surface finishing under high pressure.

• Pressure ensures strong integrated structure and fine surface of cast part, and minimizing post-process operations.

Step 4: Cooling & Ejection

• The metal cools and solidifies inside the die when the metal is filled into the cavity of the die fully, The cold die casting machine start water cooling system, cools the die, makes the metal inside the die solidifies in shorter time.

• The die opens, and ejector pins push out the casting part, and a cast cycle finished. The die close, proceed the next cast cycle.

Step 5: Trimming & Finishing

• As-cast part require some post-processes for deburring. Depends on the specific requirements of process, the cast part may be machined.

• Secondary operations (machining, surface treatment) may be applied. Such as polishing, grinding, bead blastering and other trimming operations.

Material For Cold Chamber Die Casting

These higher melting points metals need higher temperature to melt, injected into the intended shape and functional components. Depends on their own features, these metals can be processed into different die casting component in different fields.