CNC Machined Алюминий Gearbox & Transmission Cases

точность Мы специализируемся на of aluminum gearbox housings, transmission cases, and drivetrain components — from prototype to Производство. Допуски down to ±0,005 мм, 3/4/5-axis capability, ISO-certified quality. Serving automotive, industrial machinery, robotics, and aerospace clients worldwide.

Основные выводы

• Материалs: 6061-T6 (general purpose) and 7075-T6 (high-strength) Алюминиевый сплавs — full spec table below
• Capabilities: 3-axis to 5-axis Мы специализируемся на for housings, covers, bearing seats, and oil passages
• Допуски: Standard ±0.01 mm, precision ±0,005 мм for bore diameters and gasket surfaces
• Industries: Automotive EV/racing, industrial pumps, robotics actuators, aerospace structures
• Quality: CMM Осмотр, material certification, surface roughness testing on Каждая партия
• Turnaround: 7-day prototype lead time, no minimum order quantity

Why Алюминий for Gearbox & Transmission Housings

Алюминий is the dominant material for gearbox and transmission cases in modern manufacturing. Compared to cast iron or steel, aluminum offers three decisive advantages for drivetrain components:

• Weight reduction: Алюминий is 65% lighter than steel — critical for automotive Мы специализируемся на Применениеs where every kilogram affects fuel economy and acceleration. A typical aluminum gearbox housing weighs 4-8 kg versus 12-22 kg in cast iron.
• Thermal management: With thermal conductivity of 150-170 W/m·K (3× that of steel), aluminum gearbox cases act as heat sinks, dissipating friction heat from gears and bearings more efficiently. This reduces oil temperature by 10-15°C in sustained operation.
• Corrosion resistance: The natural aluminum oxide layer provides inherent protection against moisture and road salt — no plating required for most environments. For marine or chemical exposure, hard анодирование adds a 25-50 μm protective layer.
• Machinability: Алюминий’s lower cutting forces (compared to steel or titanium) enable faster cycle times, reducing per-part cost by 30-50% for Производство volumes. Tool life is 3-5× longer than when machining steel alloys.

Лучше всего для: Automotive EV housings, racing transmission cases, industrial pump bodies, and any Применение where weight × strength matters.
Avoid when: Extreme wear environments (rock crushers, mining equipment) — consider hardened steel or ductile iron instead.

Алюминиевый сплав Selection for Gearbox Применениеs

Choosing the right aluminum grade depends on your strength, weight, and corrosion requirements. Below is a comparison of the most common alloys used in gearbox and transmission manufacturing:

For most industrial gearbox Применениеs, 6061-T6 offers the best balance of strength, machinability, and cost. For performance Применениеs where weight savings justify the premium, 7075-T6 delivers near-steel strength at one-third the weight. See our complete aluminum Мы специализируемся на guide for detailed speed/feed recommendations.

Обработка на станках с ЧПУ Capabilities for Drivetrain Components

Gearbox housings demand multi-face machining with tight positional Допуски between bore centers. Our CNC capabilities cover the full range of complexity:

Лучше всего для: Bore diameters from Ø20 to Ø300 mm, bore-to-bore center distance Допуски of ±0.01 mm, flatness of 0.02 mm/m on sealing surfaces.
Avoid when: Single-setup 3-axis parts under 100×100 mm — our Токарная обработка на станках с ЧПУ service may be more cost-effective for small Вращающиеся детали.

Typical Gearbox Parts We Manufacture

Over the past decade, BravoFabs has machined thousands of drivetrain components for clients in 11 countries. The most common parts include:

• Gearbox main housings — Single-piece aluminum bodies with integrated bearing seats, oil galleries, and mounting points. Typical Допуски: bore Ø ±0.01 mm, flatness 0.02 mm/100 mm.
• Transmission cases (manual & automatic) — Split-case or monoblock designs with internal ribbing for structural rigidity. Common in EV reduction gearboxes and industrial power transmission.
• Bearing housings & retainer plates — точность-bored seats for ball and roller bearings, often with threaded mounting holes and dowel pin locations for alignment.
• Sliding sleeves & shift forks — Wear-resistant components machined from 7075-T6 with hard-anodized contact surfaces. Typical hardness: 400-500 HV after анодирование.
• Oil pump bodies & valve blocks — Complex internal channels for hydraulic fluid routing, pressure-tested to 20+ bar after machining.
• Differential cases & axle housings — Large-diameter bores with cross-drilled lubrication holes. Often machined from 6061-T6 with post-machining T6 Термообработка.
• Custom motor adapter plates — точность-machined interface plates connecting motors to gearboxes, with dowel holes for alignment and threaded bolt patterns.

Surface Финишная обработкаes & Treatments

Post-machining Обработка поверхностиs extend the life and performance of aluminum gearbox components:

For transmission cases with internal oil passages, we recommend hard анодирование on all fluid-contact surfaces to prevent erosion from hot oil flow. External surfaces can be left as-machined or anodized for corrosion resistance.

Quality Осмотр Процесс

Every gearbox housing undergoes a four-stage Осмотр protocol before shipment:

1. CMM Dimensional Осмотр — Bore diameters, center distances, flatness, and perpendicularity verified to ±0.003 mm using a coordinate measuring machine. Full dimensional reports provided with Каждая партия.
2. Surface Roughness Testing — Gasket sealing surfaces checked with a profilometer. Target: Ra 0.8-1.6 μm for sealing surfaces, Ra 1.6-3.2 μm for non-critical areas.
3. Thread Осмотр — Every tapped hole checked with go/no-go thread gauges. Thread classes: 2B/3B (inch) or 6H (metric) as standard.
4. Материал Certification — Mill test reports (EN 10204 3.1 or equivalent) included with every shipment, verifying chemical composition and mechanical properties of the raw aluminum billet.

For complete quality documentation on our Осмотр capabilities, see our QC Осмотр devices guide and Контроль качества process overview.

Industries & Применениеs

• Automotive: EV motor housings requiring tight stator bore Допуски; racing transmission cases machined from 7075-T6 billet; differential housings for performance vehicles.
• Industrial Machinery: Корпуса насосов for hydraulic systems up to 350 bar; compressor bodies with integrated cooling fins; hydraulic valve manifolds with cross-drilled galleries.
• Robotics: точность joint housings with bearing seats for harmonic drive reducers; lightweight actuator bodies for collaborative robots; motor-gearbox interface plates.
• Аэрокосмическая промышленность: Lightweight aluminum gearbox structures for UAV propulsion systems; aircraft actuator housings meeting AS9100 traceability requirements.
• Marine: Corrosion-resistant outdrive housings with hard-anodized protection against saltwater; propeller shaft bearing carriers in 6061-T6.

Why Choose BravoFabs for Gearbox Machining

We are not a general machine shop — drivetrain components are a core competency. Our ISO 9001 certified facility in Dongguan, China has dedicated fixturing for gearbox-class workpieces and processes refined over 10+ years of Мы специализируемся на experience.

• ISO 9001 certified facility with full material traceability
• 7-day turnaround on prototypes — from STEP file to first article Осмотр
• No minimum order — 1 piece prototype to 10,000+ Производство run
• Free DFM (Проектирование for Manufacturing) review identifying cost-saving opportunities before cutting metal
• DHL/FedEx/UPS worldwide shipping with full export documentation