EV Die Casting -Aluminum Structures for the Electric Vehicle Era

Electric vehicles contain more aluminum die casting than equivalent ICE vehicles. New powertrain architectures have created entire categories of die cast components that did not exist five years ago, and the weight and range imperatives of electrification are pushing aluminum into structural and chassis applications that were previously steel.

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What Makes EV Die Casting Different

T6 heat treatment requirements: BEV structural castings must meet crash safety requirements that demand yield strength only T6 treatment can provide -40-50% higher than as-cast values. T6 requires very low porosity, achievable only with vacuum-assisted HPDC (VADC). KastMfg's VADC machines support T6 structural programs.

Combined pressure tightness and thermal performance: EV cooling components -battery thermal management manifolds, motor cooling jackets, power electronics cold plates -must simultaneously contain pressurized coolant and transfer heat efficiently. A413 with VADC meets both requirements: 121 W/m·K thermal conductivity plus pressure-tight microstructure.

IP67 for high-voltage safety: Inverters, DC-DC converters, and OBC housings require IP67 sealing at the enclosure perimeter. KastMfg machines all O-ring grooves to drawing specification with CMM verification and 100% pressure testing.

EMI containment: High-voltage electronics generate significant EMI. Die cast aluminum housings provide 60-70 dB attenuation inherently; KastMfg machines flange faces to 0.01-0.02 mm flatness to ensure shield continuity at joint lines.

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EV Components Produced at KastMfg

Electric Motor Housings

Motor housings must align bearing bores to within 0.02-0.05 mm (air gap uniformity = motor efficiency), contain liquid cooling at 3- bar, and achieve IP67. KastMfg produces motor housings in A380 with VADC for cooling jacket integrity, with H6 bearing bores finish-machined in a single CNC setup.

Inverter and Power Electronics Housings

IP67-sealed housings with machined IGBT mounting faces (flatness 0.01-0.02 mm for thermal contact), precision O-ring grooves, and pressure-tested coolant circuit provisions.

Battery Tray Structural Members

Large structural castings 5-15 kg in A380, T6 heat treated after VADC. KastMfg's 1,000T and 1,600T machines handle these components. Crash load requirements met through yield strength verification on T6 witness specimens.

Onboard Charger (OBC) Housings

IP67, thermal management (200-300 W heat dissipation during charging), high-voltage connector integration, power module mounting. A380 or A413 depending on cooling circuit pressure requirements.

Thermal Management Manifolds

Battery loop and motor cooling distribution manifolds. A413 + VADC for combined pressure tightness and 121 W/m·K thermal conductivity. 100% pressure tested before shipment.

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EV Process Capabilities at KastMfg

Requirement	KastMfg Capability
T6 heat treatment	VADC achieving ASTM E505 Class 1- porosity
Large structural castings	1,000T and 1,600T, up to 30 kg
IP67 sealing	Precision O-ring grooves, CMM verified, pressure tested
Coolant circuit pressure tightness	A413 + VADC + 100% test
Motor bearing bore accuracy	H6 in single CNC setup, concentricity 0.02 mm
IATF 16949	PPAP Level 1-, full APQP

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EV Industry Trends Driving Die Casting Innovation

800V architecture: Higher voltage enables faster charging. More stringent insulation requirements affect housing wall thickness minimums and connector mounting geometry.

Silicon carbide (SiC) power modules: Junction temperatures up to 175°C versus silicon's 150°C. Higher thermal demands on housing and interface -alloy selection and interface flatness become more critical.

Structural battery integration: Battery cells integrated into the structural floor -imposing concurrent structural, sealing, and thermal requirements on one large casting.

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EV program inquiry: yaoqingpu1983@gmail.com | +86 138 1403 4409 | No.6, Rungu Road, Nanjing, China