servo motor housings, precision reducer bases, robot joint hollow frames and rotary power unit support housings

1. Application

This hollow annular aluminum housing with external mounting lugs is designed for servo motor housings, precision reducer bases, robot joint hollow frames and rotary power unit support housings. The hollow cut‑out structure realizes weight reduction and ventilation heat dissipation. The outer flange provides mating surface for end‑cap sealing, and outer triangular reinforced lugs serve for overall machine fixation. Acting as the load‑bearing skeleton of power assemblies, it accommodates internal rotors and reduction gear sets, and performs positioning, supporting, heat dissipation and mechanical mounting. Widely used in collaborative robot joints, automated servo drive modules and rotary actuators.

2. Material & Performance

Core Material: 6061‑T6 Aluminum Alloy Key Performance:

• Tensile strength ≥310 MPa, yield strength ≥276 MPa. Triangular reinforced lugs deliver good shock resistance to resist torque and alternating loads.
• Density 2.7 g/cm³. Hollow design further reduces weight and rotary inertia for dynamic motion scenarios.
• High thermal conductivity; hollow windows enhance convection cooling to dissipate heat generated by motors and reducers.
• Good dimensional stability and ageing resistance for long‑term continuous industrial operation, compliant with RoHS and REACH.

3. Processing Method

Manufactured by 5‑axis CNC turn‑mill composite machining, fully machined from solid aluminum stock without welding.

• Core processes: precision turning of inner & outer circles, face milling of flange surface, milling of circumferential hollow windows, drilling & tapping of flange holes, machining of triangular reinforced lugs and mounting holes, machining of internal positioning steps.
• Auxiliary processes: edge chamfering and full deburring to remove chips from windows and threaded holes.
• One‑setup multi‑feature machining to guarantee inner‑outer coaxiality, flange run‑out and positional accuracy of lug holes.

4. Machining Accuracy & Usage Requirements

Machining Accuracy:

• Dimensional tolerance: ±0.015 mm
• Geometric tolerance: inner‑outer coaxiality ≤0.02 mm, flange face run‑out ≤0.02 mm, lug‑hole position tolerance ≤0.02 mm
• Surface roughness: Ra ≤1.6 μm, smooth flange mating surface for good end‑cap fitting. Usage Requirements:
• Operating temperature: ‑20℃ ~ +85℃, withstand alternating torque and vibration from motor start‑stop cycles.
• Stable coaxiality is required to avoid scraping or interference of internal rotors and gears.
• Hollow windows allow air convection; keep debris out of cavity during assembly.
• Lugs are main stress‑bearing points; apply specified bolt torque to prevent housing deformation.

5. Heat Treatment

Heat‑treated with solution treatment plus artificial aging (T6).

• Purpose: relieve residual cutting stress, prevent oval distortion of thin‑walled hollow structure, stabilize coaxiality and flange flatness, improve overall mechanical strength.

6. Post‑treatment

Raw milled aluminum finish without anodizing.

• Retains original CNC machining texture. Optional natural anodizing, black anodizing or conductive anodizing upon customer request. Bare aluminum offers optimal thermal conductivity for internal assembly; store in dry environment to avoid surface oxidation.

7. Quality Control

Full‑process quality control according to ISO9001:

• Incoming inspection: spectroscopic verification of 6061‑T6 material with material certificate.
• In‑process patrol inspection: focus on coaxiality, flange run‑out and lug‑hole position; monitor thin‑wall deformation of hollow sections.
• Final inspection: full dimensional check and visual inspection for burrs and chipping on windows and threads; traceable test records per batch.
• Pre‑shipment cleaning: thoroughly remove aluminum chips from cavity, threaded holes and hollow slots to meet precision power‑unit assembly requirements.
• Industrial Packaging: Each part wrapped with PE protective film to cover precision machined surfaces, separated by foam gaskets to prevent collision and scratches. Packed into anti‑static cartons filled with EPE foam cushioning. Export‑grade corrugated outer cartons with product label and batch number. Pallet packing available for mass orders, suitable for domestic storage, sea and land transportation to avoid thin‑wall housing deformation during transit.