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What Is Gigacasting? How Integrated Die Casting Changes EV Body Manufacturing

Gigacasting uses very large high-pressure aluminum die casting to form major EV body structures as one-piece or highly integrated castings. In EV body manufacturing, the process can replace many stamped and welded parts, support EV body lightweighting, and shift engineering effort toward alloy selection, die design, vacuum control, and production validation.

Technical reviews describe integrated die casting as a major route for new energy vehicle body structures where manufacturers want fewer parts and more repeatable large-structure production (Frontiers, 2026). The practical question is not only what this process means, but whether the press, alloy, mold, and process-control system are ready for the target structure.

Table of Contents

What Is Gigacasting?

Gigacasting is large-format aluminum die casting for integrated body structures such as rear floors, front body sections, underbody components, battery housings, and structural modules. It is often discussed with integrated die casting, mega casting, one-piece die cast body design, aluminum die casting for EVs, and aluminum gigacast underbody production.

In conventional body manufacturing, sheet-metal parts are stamped, positioned, welded, and checked as an assembly. In this casting route, a large tonnage die casting machine injects molten aluminum into a large die under high pressure. With a heat-treatment-free aluminum alloy, robust mold design, a controlled vacuum die casting process, and stable thermal management, one casting can replace many smaller parts. Public explainers describe the same idea: large aluminum structural castings reduce part count and assembly work when the body is designed around them (J.D. Power, 2026).

Why EV Makers Use Integrated Castings

The source archive states that a 10% vehicle mass reduction may cut fuel use by 5% to 10%; a 100 kg reduction may reduce fuel consumption by 0.3 to 0.6 L/100 km and CO2 emissions by 8.5 g/km; and a 10% mass reduction in a battery EV may improve driving range by 5% to 8%.

It also records source-stated case metrics: a 6000 t rear-floor casting program reduced lower-body weight by 10% and manufacturing cost by 40%; another integrated body program reduced parts from 171 to 2, cut more than 1600 welding points, reduced vehicle weight by 10%, increased range by 14%, reduced parts by 370, reduced cost by 7%, and reduced unit investment by 8%.

Other examples cite a 4400 t sample integrating about 30 parts with about 10 kg weight reduction; a 20B SEK factory modernization with 55,000 tons of annual aluminum foundry capacity and a 2025 production expectation; a concept structure with 15% to 20% body weight reduction, below 10 kWh/100 km energy use, and over 1000 km range; and a rear-floor program with 30% weight reduction, 7 L more trunk space, and 34000 N·m/deg torsional rigidity.

These numbers explain the appeal, but they are not automatic results. A 2026 industry overview frames large integrated castings as a productivity opportunity with practical barriers including cost, repairability, material control, and process complexity (MOTOR, 2026).

Gigacasting vs Stamping and Welding

Gigacasting vs stamping and welding is not a simple better-or-worse comparison. Stamping and welding remain flexible and familiar. Large integrated castings can reduce fixtures, welds, and tolerance stack-up, but they shift difficulty into die life, aluminum alloy behavior, vacuum control, thermal balance, dimensional simulation, and defect prevention.

The source says one mold can support 60,000 to 80,000 sets per year and may cost close to RMB 10 million. It also cites a first 6800 t-class mold, mold weight above 140 t, a structural casting size of about 1.7 m × 1.5 m × 0.7 m, pouring weight of about 100 kg, 9000 t rear-floor parts, and 12000 to 20000 t body-structure mold development. Those values show why the route fits high-volume, high-discipline programs better than low-volume or frequently changing structures.

Core Technical Requirements for Integrated Die Casting

flowchart TB
    A[EV body gigacasting goal] --> B[Large-tonnage die casting machine]
    A --> C[Heat-treatment-free aluminum alloy]
    A --> D[Die/mold design and CAE validation]
    A --> E[Vacuum die casting process control]
    B --> F[Integrated aluminum body structure]
    C --> F
    D --> F
    E --> F

The source defines four barriers: large die casting machines, heat-treatment-free aluminum alloy formulation, die/mold design, and vacuum die casting process control.

Press size is the first barrier. Integrated body casting usually requires clamping force above 6000 t, while conventional high-pressure die casting is usually below 5000 t. The source lists 92000 kN, 6218 t, 6000 t, 8800 t, and 12000 t machine classes, with one 6218 t press described as 19.5 m long, 5.9 m wide, and 5.32 m high, using a 2.35 m table and allowing parts within a 2 m envelope.

Material is the second barrier. Heat-treatment-free aluminum alloy matters because large castings can distort during conventional solution and aging heat treatment. The alloy must deliver strength, ductility, flow, and castability after forming. Recent materials research also identifies non-heat-treatable aluminum alloy development as an enabler for integrated die casting (npj Computational Materials, 2026).

The mold is the third barrier. Die casting mold design for gigacasting must manage filling, venting, slag collection, cooling shrinkage, thermal balance, fatigue, and dimensional stability. The source highlights CAE simulation, late-solidification feeding strategy, and avoiding hot spots that can create shrinkage cavities, looseness, or cracks.

Process Controls and Quality Risks

The vacuum die casting process is central because trapped gas can become pores. The source describes precision sensors for the vacuum tank, pouring exhaust valve, and cavity exhaust valve, with four trigger points: pouring vacuum start, pouring vacuum end, cavity vacuum start, and cavity vacuum end.

The source gives practical process values: nitrogen or argon degassing for 10 to 15 minutes; melting temperature of 730±10°C and not above 780°C; casting temperature of 700 to 710°C; and mold temperature of 120 to 180°C. After the punch blocks the pouring port, rapid vacuum should begin, the cavity should reach its vacuum requirement before the chamber is full, and the vacuum valve should close as late as possible. Research on high-vacuum die casting and heat-treatment-free alloys supports the same principle: composition, process, and microstructure must be controlled together (Journal of Manufacturing Processes, 2025).

The source further states that one early program had a 65% to 72% pass rate, later exceeding 80%, and a 30% gross margin. The business case depends on stable yield, not press size alone.

When Large Castings Make Sense

A large integrated casting route makes the most sense when the program has high volume, a stable body architecture, enough capital budget, mature alloy support, qualified mold manufacturing, strong simulation capability, and process engineers who can tune vacuum, injection, melt, mold temperature, spraying, and extraction. It is less attractive when design changes are frequent, repair strategy is unclear, casting size is not structurally justified, or the team lacks large-casting process control.

A practical planning screen should ask whether the target casting replaces enough stamped and welded parts, whether the project can justify a 6000 t or larger press class, whether the alloy is validated, whether the mold can handle filling and shrinkage, and whether the vacuum and thermal process window can repeat at production speed.

FAQ

What is gigacasting in EV manufacturing?

Gigacasting in EV manufacturing is large-format high-pressure aluminum die casting for integrated body structures. It uses a large press, heat-treatment-free aluminum alloy, mold simulation, and vacuum control to produce fewer large structural castings instead of many stamped and welded parts.

Is gigacasting better than stamping and welding?

It can be better for high-volume EV programs that need fewer parts, lower assembly complexity, and lightweight integrated structures. Stamping and welding can be better when design changes often, volumes are lower, repairability is a priority, or the project cannot justify the press, mold, alloy, and process-control investment.

Why do heat-treatment-free aluminum alloys matter for gigacasting?

Heat-treatment-free aluminum alloys matter because large castings can distort during conventional heat treatment. A suitable alloy should reach the required strength, ductility, and casting performance after die casting, reducing the need for thermal processes that may deform the part.

What equipment is needed for gigacasting?

A line usually needs a large tonnage die casting machine, a large integrated mold, controlled aluminum melting and handling, vacuum equipment, precision sensors, die temperature control, spraying and extraction equipment, CAE simulation, and quality inspection.

Conclusion

Gigacasting is an integrated manufacturing system, not just a bigger press. The payoff can be fewer parts, fewer welds, lighter structures, and simpler assembly, but only when large-tonnage equipment, heat-treatment-free aluminum alloy, die casting mold design, vacuum process control, and production-quality validation work together.

If you are evaluating integrated aluminum structural casting or related production equipment for an EV body or industrial manufacturing project, UBright can help review drawings, process requirements, machine planning, and production-line options before you commit to a full equipment route.

References

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