CNC Machined アルミニウム Gearbox & Transmission Cases

精密 出荷前に問題を発見します。 of aluminum gearbox housings, transmission cases, and drivetrain components — from prototype to production. 公差 down to ±0.005 mm, 3/4/5-axis capability, ISO-certified quality. Serving automotive, industrial machinery, robotics, and aerospace clients worldwide.

重要ポイント

• 材料s: 6061-T6 (general purpose) and 7075-T6 (high-strength) アルミニウム合金s — full spec table below
• Capabilities: 3-axis to 5-axis 出荷前に問題を発見します。 for housings, covers, bearing seats, and oil passages
• 公差: Standard ±0.01 mm, precision ±0.005 mm for bore diameters and gasket surfaces
• Industries: Automotive EV/racing, industrial pumps, robotics actuators, aerospace structures
• Quality: CMM 検査, material certification, surface roughness testing on every batch
• Turnaround: 7-day prototype lead time, no minimum order quantity

Why アルミニウム for Gearbox & Transmission Housings

アルミニウム 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: アルミニウム is 65% lighter than steel — critical for automotive 出荷前に問題を発見します。 用途s 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 化学的 exposure, hard 陽極酸化 adds a 25-50 μm protective layer.
• Machinability: アルミニウム’s lower cutting forces (compared to steel or titanium) enable faster cycle times, reducing per-part cost by 30-50% for production volumes. Tool life is 3-5× longer than when machining steel alloys.

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

アルミニウム合金 Selection for Gearbox 用途s

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 用途s, 6061-T6 offers the best balance of strength, machinability, and cost. For performance 用途s where weight savings justify the premium, 7075-T6 delivers near-steel strength at one-third the weight. See our complete aluminum 出荷前に問題を発見します。 guide for detailed speed/feed recommendations.

CNC加工 Capabilities for Drivetrain Components

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

最適な用途: Bore diameters from Ø20 to Ø300 mm, bore-to-bore center distance 公差 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 CNC旋盤加工 service may be more cost-effective for small 回転部品.

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 公差: 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 — 精密-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 陽極酸化.
• 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 熱処理.
• Custom motor adapter plates — 精密-machined interface plates connecting motors to gearboxes, with dowel holes for alignment and threaded bolt patterns.

Surface 仕上げes & Treatments

Post-machining 表面処理s extend the life and performance of aluminum gearbox components:

For transmission cases with internal oil passages, we recommend hard 陽極酸化 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 検査 工程

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

1. CMM Dimensional 検査 — Bore diameters, center distances, flatness, and perpendicularity verified to ±0.003 mm using a coordinate measuring machine. Full dimensional reports provided with every batch.
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 検査 — Every tapped hole checked with go/no-go thread gauges. Thread classes: 2B/3B (inch) or 6H (metric) as standard.
4. 材料 Certification — Mill test reports (EN 10204 3.1 or equivalent) included with every shipment, verifying 化学的 composition and 機械的 properties of the raw aluminum billet.

For complete quality documentation on our 検査 capabilities, see our QC 検査 devices guide and 品質管理 process overview.

Industries & 用途s

• Automotive: EV motor housings requiring tight stator bore 公差; racing transmission cases machined from 7075-T6 billet; differential housings for performance vehicles.
• Industrial Machinery: ポンプハウジング for hydraulic systems up to 350 bar; compressor bodies with integrated cooling fins; hydraulic valve manifolds with cross-drilled galleries.
• Robotics: 精密 joint housings with bearing seats for harmonic drive reducers; lightweight actuator bodies for collaborative robots; motor-gearbox interface plates.
• Aerospace: 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 出荷前に問題を発見します。 experience.

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