Aluminum casting & mold design services

In modern electronic device development, balancing “thermal management” for high performance with “weight reduction” for mobile and automotive devices is a critical and unavoidable challenge. In particular, power control units for 5G communication equipment and EVs (Electric Vehicles) are prone to rapid internal temperature spikes due to higher power output, reaching the physical limits of conventional plastic enclosures. Consequently, “aluminum die casting” is regaining significant attention. Aluminum offers an ideal combination of excellent thermal conductivity and the ability to be mass-produced in complex, high-precision shapes through the die casting process—properties that are extremely attractive to procurement and R&D managers in the manufacturing sector.
This article details the specific benefits of adopting aluminum die casting for electronic devices, key points in heat dissipation design, and cost optimization strategies through sourcing from Vietnam, incorporating the latest statistical data.

Most failures in electronic devices are caused by heat. It is said that the failure rate of semiconductor elements approximately doubles for every 10°C increase in operating temperature; thus, efficient heat dissipation (heatsink functionality) directly impacts product lifespan.

The thermal conductivity of pure aluminum is approximately 237 W/m·K, which is hundreds of times higher than general resins (0.2–0.5 W/m·K) and about 15 times higher than stainless steel (approx. 16 W/m·K). Even the ADC12 alloy commonly used in die casting boasts a thermal conductivity of approximately 92 W/m·K, excelling at quickly conducting internal heat to the surface and dissipating it externally.

The greatest strength of die casting is the ability to mold complex heat dissipation fins (plate-like protrusions) integrally with the enclosure. Since this eliminates the need for add-on heatsinks, it leads to a reduction in part count (part consolidation), resulting in lower assembly costs and improved reliability.

Currently, the aluminum die casting market is expanding rapidly driven by the progress of CASE (Connected, Autonomous, Shared & Services, Electric).

Key Data: Statistical Indicators for the Aluminum and Die Casting Industry

Let’s look at specific applications of how aluminum die casting is utilized in the electronics field.

5G base stations consume several times more power than 4G, generating massive amounts of heat. Furthermore, since they are primarily installed outdoors, corrosion resistance and waterproofing are required. Aluminum die-cast enclosures provide both high heat dissipation through complex fin structures and airtightness by precisely molding features like O-ring grooves, making them an indispensable component supporting today’s infrastructure.

With the evolution of autonomous driving technology, the computational power of automotive ECUs has increased dramatically. Because they are often installed in high-temperature environments such as near the engine compartment or inside the dashboard, the heat dissipation and Electromagnetic Shielding (EMS) performance of aluminum are highly valued. Aluminum inherently blocks electromagnetic waves, preventing interference with surrounding electronic devices.

Thin-wall die casting technology is also used for the internal frames (mid-frames) of laptops and high-end tablets. By achieving ultra-thin wall thicknesses of 0.8 mm to 1.0 mm, it provides a level of rigidity unattainable with resin, protecting LCD panels and circuit boards.

For the Japanese manufacturing industry, diversifying away from over-concentration in China (China Plus One) is an urgent priority. In this context, Vietnam has become a powerful option, with many Japanese manufacturers—including Daiwa Light Alloy Vietnam—expanding their operations there.

Manufacturing costs in Vietnam can be reduced to approximately one-third or one-fourth of those in Japan on a labor-cost basis. This cost difference significantly contributes to the final unit price, especially in processes like post-die-casting deburring, complex CNC machining, and manual inspection stages.

The concern that “overseas production equals unstable quality” is a thing of the past. Today, Japanese-affiliated factories in Vietnam operate under management systems compliant not only with ISO 9001 but also IATF 16949 for the automotive industry. At Daiwa Light Alloy Vietnam, we have introduced the latest equipment equivalent to that in Japan (such as 350-ton to 850-ton casting machines) and supply “Japan Quality” aluminum castings to the world under the guidance of Japanese engineers.

There are specific design rules unique to aluminum die casting that procurement managers and designers should be aware of:

Optimizing these factors reduces defect rates and enables further cost reductions.

As electronic devices become more high-performance and compact, the role of aluminum die casting is greater than ever before. Thermal conductivity approaching 100 W/m·K, several times the rigidity of resin, and electromagnetic shielding properties—the die casting technology that can integrate these characteristics into a single component is truly a “weapon” for the manufacturing industry.

Particularly as global demand tightens, securing a stable production base in Vietnam directly links to strengthening supply chain resilience.

Daiwa Light Alloy Vietnam combines Japanese casting expertise cultivated over many years with the young and energetic production capacity of Vietnam to solve our customers’ challenges of “weight reduction, heat dissipation, and cost reduction.” If you are facing thermal issues with your current design or considering switching to overseas procurement, please contact us with your drawings. We provide optimal one-stop solutions from prototyping to mass production.