Aluminum Die Casting Services: Process, Alloys, and Cost Guide
Aluminum die casting forces molten aluminum into a steel mold at pressure, producing complex, thin-walled, high-volume parts with excellent dimensional repeatability. It is the go-to for automotive, lighting, electronics, and power-tool housings. This guide covers the process, alloy choices, tooling economics, and how to decide if die casting beats machining or extrusion for your part.
How Die Casting Works
Metal is melted, injected into a hardened steel die under high pressure, cooled, and ejected. Die casting repeats the cycle thousands of times from one tool, holding tight tolerances without secondary machining on most features.
Aluminum Alloys: Pick for Performance
- ADC12 / A380 — general-purpose, good castability and strength.
- A360 / A356 — better corrosion resistance and pressure tightness.
- Custom blends — tuned for heat dissipation or machining.
For lower volumes or simpler shapes, sand casting and investment casting avoid the high tooling cost.
Die Casting vs. CNC Machining vs. Extrusion
Die casting wins on per-part cost at volume and on complex thin walls. CNC machining wins on low volume and extreme tolerance. Aluminum extrusion wins on long constant-cross-section profiles. Our combined processes often cast then machine for the best of both.
Tolerances and Finishing
Typical die-cast tolerances are ±0.1–0.2 mm, with deburring, anodizing, and powder coating applied as needed. Ejector marks and parting lines are planned into the tool.
When Die Casting Pays Off
- Annual volume is high enough to amortize tooling.
- The part is thin-walled or complex in 2D/3D.
- Repeatability matters across every shot.
- You want one supplier for cast, machine, and finish.
FAQ
What is the tooling cost?
Higher than sand casting but amortized across volume; it drops per-part cost sharply.
Can you machine after casting?
Yes—critical faces are CNC-machined for sealing and fit.
What finishes work on aluminum castings?
Anodize, powder coat, and chromate conversion are common.
Why Choose Huaxiao for Aluminum Die Casting
Our aluminum die casting service pairs tooling, casting, machining, and finishing so your parts arrive production-ready. Send your model for a tooling and piece-price quote.
