Aluminum Transmission Casings

Material: Aluminum (A356-T6, 6061-T6, 319-T6)
Manufacturing: Die Casting, Sand Casting, CNC Machining
Application: Automotive transmissions, industrial gearboxes, transfer cases
Surface: As-cast, machined, powder coated
MOQ: 10 pcs

Product Parameters

Item	Specification
Material	Aluminum (A356-T6, 6061-T6, 319-T6)
Manufacturing	Die Casting, Sand Casting, CNC Machining
Application	Automotive transmissions, industrial gearboxes, transfer cases
Surface	As-cast, machined, powder coated
MOQ	10 pcs

description

Aluminum transmission casings contain the gears, shafts, and bearings that transmit power in drivetrains - the casing must be stiff enough to maintain gear mesh alignment under load, provide accurate bearing bores, and include passages for lubricant. Aluminum's thermal conductivity helps dissipate heat from gear friction and bearings. Die casting produces smooth surfaces and good dimensional accuracy in high volumes, but tooling costs are high. Sand casting handles lower volumes and larger parts. Many transmission casings are initially cast and then extensively CNC machined to achieve the precise bearing bores and gear shaft centers.

Why Transmission Casings Require Extensive Machining

The as-cast surface of a casing is not dimensionally accurate enough for bearing bores and gear centers. Transmission casings are machined on CNC machining centers that reference the casting parting line - the surfaces that were against the mold faces during casting. All bearing bores, gear shaft centers, and mounting surfaces are machined relative to that reference.

FAQ

Q1: MOQ?

A1: 10 pieces for aluminum transmission casings.

Q2: Materials?

A2: A356-T6 (die casting), 6061-T6 (extruded/machined), 319-T6 (sand casting).

Q3: Manufacturing methods?

A3: Die casting (high volume), sand casting (large parts), CNC from plate/extrusion.

Q4: Surface finish?

A4: As-cast internal, machined bearing and mounting surfaces, powder coated external.

Q5: Custom configurations?

A5: Yes. Custom shaft sizes, bearing configurations, port locations.

Q6: Testing available?

A6: Dimensional verification, pressure testing of oil passages.

Quality is non-negotiable in precision manufacturing. Every component undergoes rigorous inspection at each stage of production.

IATF 16949 - Automotive quality management system for safety-critical components
PPAP / PPF - Production Part Approval Process documentation available on request
AIAG Core Tools - APQP, FMEA, SPC, and MSA documentation on demand
Material Traceability - Mill test reports, heat treatment records, and certificates of conformance for every batch

From raw material to finished product, every step is controlled and documented:

Pattern Making - Wooden or metal pattern fabrication for sand/centrifugal/investment casting
Molding - Sand casting, shell mold, centrifugal, or lost-wax investment casting setup
Melting & Pouring - Controlled furnace melting with chemistry and temperature monitoring
Solidification & Shakeout - Controlled cooling with riser/removal and core shakeout
Heat Treatment - Annealing, normalizing, or solution treatment per specification
Machining - CNC machining, drilling, and tapping to final dimensions
Surface Treatment - Grinding, welding, or coating as required
Inspection & Testing - Dimensional, visual, hydrostatic, or NDT inspection
Cleaning & Packaging - Sand removal, degreasing, rust prevention, and packaging

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