YouHeng is a leading manufacturer specializing in custom aluminum extrusions. With 15 years of industry expertise, we provide precision-engineered, high-performance aluminum components tailored to meet diverse industrial and commercial needs. Committed to innovation, quality, and customer satisfaction, YouHeng delivers reliable solutions for sectors such as construction, electronics, and transportation.

Custom aluminum extruded enclosures are high-performance structural components manufactured through precision extrusion processes, widely used in electronic devices, industrial machinery, energy systems, and specialized equipment. They offer high design flexibility, allowing customization of cross-sectional shapes, dimensions, wall thicknesses, surface finishes, and functional features (such as heat sinks, mounting slots, and interface openings) to achieve an optimal balance of lightweight design, high strength, and aesthetic appeal. Commonly used materials include 6061, 6063, and 6082, catering to varying strength and surface treatment requirements.

 

Common Alloys and Metallurgical Composition

 

Material selection for custom aluminum extruded enclosures must consider structural strength, corrosion resistance, machinability, and cost.

 

• 6061-T6: High strength (tensile strength ≥290 MPa), suitable for load-bearing structures and high-load equipment enclosures.
• 6063-T5/T6: Excellent extrudability and surface finish quality, ideal for electronic instrument enclosures with high aesthetic demands.
• 6082-T6: Commonly used in Europe, strength comparable to 6061, suitable for heavy machinery enclosures.
• 5xxx series aluminum (e.g., 5052): Outstanding corrosion resistance, ideal for marine or chemical environments.

 

Primary Classifications and Application Scenarios

Type	Features and Applications
Heat-Dissipating Enclosures	Integrated heat sinks/fins for power modules, LED lighting, automotive controllers, etc.
Sealed Enclosures	Designed with sealing grooves (for O-rings) and waterproof structures for outdoor communication devices, sensors.
DIN Rail-Mount Enclosures	Compliant with DIN rail standards for industrial automation controllers, PLC modules.
Modular/Stackable Enclosures	Multi-section design supporting expansion for rack-mounted servers, test instruments.
Decorative Enclosures	Featuring brushed surfaces, multi-color anodizing for consumer electronics, display devices, medical instruments.

Detailed Customization Options

 

1. Cross-Sectional Shape Customization

• Asymmetric, multi-chamber, or irregular hole structures for cable management, ventilation, or internal component layout.
• Minimum wall thickness: 0.8 mm; maximum circumscribed circle diameter: ≤300 mm (depending on die capability).

2. Functional Integration Customization

• Heat dissipation: Increased fin density and optimized airflow channels.
• Mounting interfaces: Pre-tapped holes, snap-fit slots, rail hooks.
• EMI shielding: Built-in conductive coating channels or metal compartment structures.

3. Dimensional and Tolerance Control

• Length customization range: 100 mm–6,000 mm (longer lengths achievable via segmented welding).
• Critical dimension tolerances as tight as ±0.1 mm (requires specialized dies and process control).

4. Surface Finish Customization

• Anodizing: Customizable film thickness (5–25 μm) and colors (black, silver, champagne gold, etc.).
• Powder coating: RAL/PANTONE color matching available.
• Conductive oxidation: For grounding or EMI shielding applications.

5. Secondary Machining Services

• CNC cutting, drilling, tapping, slot milling.
• Laser engraving for logos or QR codes.

 

Manufacturing Processes and Standards

 

1. Die Development

• New die lead time: 15–25 days; cost approximately $800–$3,000 (depending on complexity).
• Modification of existing dies available to reduce development costs.

2. Extrusion and Finishing

• Extrusion presses (600–2,500 tons) with online quenching and aging treatments.
• Compliant with ASTM B221, GB/T 6892, EN 755, and other standards.

3. Quality Control

• Material certificates (chemical composition, mechanical properties).
• Coordinate Measuring Machine (CMM) inspection for dimensional compliance.

  

 

Typical Technical Parameters (Example: 6063-T5 Enclosure)

Parameter	Value/Range
Tensile Strength	≥175 MPa
Yield Strength	≥115 MPa
Wall Thickness Range	0.8 mm – 6.0 mm
Cross-Section Tolerance	±0.15 mm (die-based)
Straightness	≤0.3 mm/1000 mm

 

Procurement and Design Recommendations

 

1. Design Optimization

• Avoid sharp corners; use radii ≥0.5 mm to improve extrusion flow.
• Symmetrical wall thickness design reduces deformation risks.

2. Cost Control

• Order quantities ≥500 kg to amortize die costs.
• Opt for standard colors/surface finishes to reduce expenses.

3. Documentation Requirements

• Provide CAD drawings (DXF/DWG formats) with critical tolerances.
• Specify material, surface finish, packaging, and marking requirements.

 

Application Case Studies

 

1. Drone Controller Enclosure

• Material: 6061-T6, wall thickness: 2 mm, internal heat sinks + vibration-dampening mounting posts.

2. Photovoltaic Inverter Enclosure

• Material: 6082-T6, conductive oxidation surface, IP65 sealed structure.

3. Laboratory Instrument Housing

• Material: 6063-T5, champagne gold anodized finish, modular stackable design.

  

 

Technical Guide for Custom Aluminum Extruded Cases

 

          A.Cross-Section Mechanical Property Calculation Tables

 

Typical Performance Parameters for Standard Aluminum Extruded Cases

Performance Parameter	6063-T5	6061-T6	6082-T6	Typical Application Recommendation
Tensile Strength (MPa)	175-215	290-310	310-340	Choose 6061/6082 for load-bearing structures
Yield Strength (MPa)	115-140	240-255	260-280	High-load components require ≥240 MPa
Elongation (%)	8-12	8-12	8-10	≥8% required for deformation processing
Elastic Modulus (GPa)	69	69	69	Unified value for stiffness calculations
Hardness (HV)	70-85	95-105	100-115	For wear resistance requirements
Thermal Conductivity (W/m·K)	201	167	170	Reference for heat dissipation design
Density (g/cm³)	2.70	2.70	2.70	Baseline for weight calculation

 

Section Property Calculation Table

Section Shape	Moment of Inertia Ix (cm⁴)	Moment of Inertia Iy (cm⁴)	Section Modulus Wx (cm³)	Section Modulus Wy (cm³)	Torsional Constant J (cm⁴)
Rectangular Hollow Section	(BH³ – bh³)/12	(HB³ – hb³)/12	Ix/(H/2)	Iy/(B/2)	2t₁t₂(B-t₁)²(H-t₂)²/(Bt₁+Ht₂-t₁²-t₂²)
Section with Cooling Fins	I_base + ΣI_fin	Needs individual calculation	W_base + fin contribution	Needs individual calculation	Primarily base contribution
Multi-Cavity Section	Composite after zonal calculation	Composite after zonal calculation	Composite after zonal calculation	Composite after zonal calculation	Approximated as sum of cavities and walls

 

Calculation Notes:

1. Bending Stiffness: EI (E = 69 GPa)
2. Critical Buckling Stress: σ_cr = π²E/(KL/r)²
3. Torsional Stiffness: GJ (G = 26 GPa)
4. Minimum Wall Thickness: t_min ≥ P/(σ_allow·L) + corrosion allowance (0.3mm)

 

Recommended Design Safety Factors

Application Scenario	Static Load Factor	Dynamic Load Factor	Fatigue Factor	Temperature Factor
Electronics Enclosure	1.5-2.0	2.0-2.5	1.8-2.2	1.1 (≤80°C)
Industrial Machine Guard	2.0-2.5	2.5-3.0	2.0-2.5	1.2 (≤120°C)
Outdoor Telecom Equipment	2.2-2.8	3.0-3.5	2.5-3.0	1.3 (≤150°C)
Vehicle-Mounted Equipment Enclosure	2.5-3.0	3.5-4.0	3.0-3.5	1.5 (≤180°C)

          B.Connector Selection Recommendations

 

1. Corner Bracket Connection Systems

 

Corner Bracket Type Selection Table

Bracket Type	Material	Suitable Wall Thickness	Load Capacity	Installation Method	Suitable Scenarios
Internal Right-Angle Bracket	6063-T5	1.5-3.0 mm	Medium	Hidden screws	Electronic devices, instrument enclosures
Reinforced External Corner Bracket	6061-T6	2.0-5.0 mm	High	Through-hole bolts	Racks, load-bearing structures
Adjustable Angle Bracket	Zinc Alloy	1.5-4.0 mm	Medium-High	Slider adjustment	Non-standard frames, display stands
Quick-Assembly Bracket	POM/Aluminum	1.2-2.5 mm	Low-Medium	Snap-fit	Temporary structures, exhibition equipment
Waterproof Sealed Bracket	Aluminum + Silicone	2.0-4.0 mm	Medium	Compression seal	Outdoor equipment, waterproof enclosures

 

Installation Technical Requirements

• Screw Spacing: Minimum 5x screw diameter, maximum 8x wall thickness
• Edge Distance: ≥1.5x screw diameter
• Thread Depth: ≥2x screw diameter
• Torque Control: M4: 1.5-2.0 N·m, M5: 3.0-4.0 N·m, M6: 5.0-7.0 N·m

 

2. Bolt and Fastener Selection

 

Fastener Selection Matrix

Connection Requirement	Recommended Type	Material Grade	Anti-Loosening Measure	Surface Finish	Preload Control
High Load-Bearing Structures	Hex Socket Head Cap Screw	Grade 8.8 / A2-70	Double nut / Lock washer	Zinc-plated / Dacromet	Torque / Angle method
Frequent Disassembly	Knob Head Bolt / Quick-Release Pin	Stainless Steel 304	Spring pin / Circlip	Passivation	Hand-tightened feel
Waterproof Sealing	Countersunk Bolt + O-ring	A4-80	Sealant assisted	Nickel / Chrome plating	Compression control
Vibration Resistance	Nylon Insert Lock Nut	Carbon Steel / Stainless Steel	Self-locking nut	Phosphating / Zinc plating	Standard torque
High Appearance Requirements	Flat Head Socket Cap Screw	Stainless Steel 316	Concealed installation	Anodizing	Limited installation

 

Recommended Fastener Specifications Table

Enclosure Wall Thickness (mm)	Recommended Bolt Diameter	Washer Size	Drill Hole Diameter	Countersink Size
1.2-1.8	M3	φ6×0.5	φ3.2	φ6×1.5
1.8-2.5	M4	φ8×0.8	φ4.3	φ8×2.0
2.5-3.5	M5	φ10×1.0	φ5.3	φ10×2.5
3.5-5.0	M6	φ12×1.5	φ6.4	φ12×3.0
>5.0	M8	φ16×1.5	φ8.4	φ16×4.0

 

Special Connection Solutions

• Adhesive + Mechanical Hybrid Connection: Structural adhesive + M4 bolt, increases load capacity by 40%
• In-mold Insert Connection: Threaded insert pre-embedded during extrusion, avoids post-tapping
• Slotted Connection System: T-slot + sliding block, for adjustable positioning

          C.Industry Application Case Studies

 

Case 1: 5G Base Station Outdoor Waterproof Enclosure

 

Project Requirements:

• IP67 protection rating, operating temperature -40°C to +85°C
• Efficient heat dissipation (thermal dissipation ≥200W)
• Wind pressure resistance ≥2000 Pa, anti-theft design

 

Solution:

1. Cross-Section Design:

• Main material: 6082-T6, wall thickness 3.0mm
• Integrated cooling fins: fin height 25mm, pitch 8mm
• Built-in anti-condensation drainage channels

2. Connection System:

• Waterproof corner brackets: silicone seal + stainless steel bolts
• Quick-release panels: quarter-turn locking mechanism
• Grounding terminals: embedded copper busbar connection

3. Key Parameters:

• Heat dissipation capability: 0.25°C/W
• Wind pressure test: 2400 Pa without deformation
• Salt spray test: 1000 hours

 

Case 2: Industrial Robot Control Cabinet Enclosure

 

Project Requirements:

• EMI shielding ≥40 dB (1 GHz)
• Modular expansion, easy maintenance
• Vibration resistance 10-500 Hz, 2.5 Grms

 

Solution:

1. Cross-Section Design:

• Three-cavity structure: power / signal / heat dissipation zones
• Conductive oxidation treatment: surface resistance ≤0.1 Ω
• Rib layout: grid pattern, pitch 80mm

2. Connection System:

• EMI shielding connectors: spring finger contact, 360° continuous conductivity
• Vibration-damping mounting feet: SBR rubber + aluminum base
• Rail-mounted modules: DIN 35 standard, quick plug-and-play

3. Performance Indicators:

• Shielding effectiveness: 45 dB @ 1 GHz
• Natural frequency: 85 Hz (avoiding resonance zone)
• Expansion interface: supports 8-module cascading

 

Case 3: New Energy Vehicle On-Board Charger (OBC) Enclosure

 

Project Requirements:

• Lightweight: ≥50% weight reduction compared to steel
• Integrated coolant circulation channels
• Flame retardant requirement UL94 V-0

 

Solution:

1. Cross-Section Design:

• Dual-channel structure: coolant + air dual circulation
• Flame-retardant coating: temperature resistant 200°C, self-extinguishing time <3s
• Lightweight design: topology optimization, material distribution optimization

2. Connection System:

• Leak-tight fluid connectors: SAE standard quick-connect fittings
• High-voltage interlock (HVIL): integrated HVIL connectors
• Vibration-resistant bolts: full-thread thread-locking compound applied

3. Results:

• Weight: 4.2 kg (original steel version 9.5 kg)
• Cooling efficiency: liquid cooling removes 75% of heat
• Safety certification: Passed ISO 20653 dust/water ingress tests

 

Case 4: Medical CT Equipment Slip Ring Enclosure

 

Project Requirements:

• Rotating component, dynamic balance grade G2.5
• Low outgassing (meets cleanroom requirements)

Long-term operational accuracy maintenance

 

Solution:

1. Cross-Section Design:

• Thin-wall precision: wall thickness 1.5mm ±0.1mm
• Anodizing: medical grade, low metal ion leaching
• Dynamic balance structure: symmetrical design, balancing weight adjustment area

2. Connection System:

• Precision bearing seat: integrally extruded
• Integrated signal slip ring: custom brush contact surface
• Sterilization compatibility: withstands multiple disinfection cycles

3. Technical Specifications:

• Unbalance amount: ≤0.5 g·mm/kg
• Surface roughness: Ra 0.8 μm
• Service life: >10 million revolutions

 

Case 5: Shipborne Radar Equipment Shock-Resistant Enclosure

 

Project Requirements:

• MIL-S-901D Grade A shock resistance
• Triple protection (anti-salt spray, fungus, humidity)
• EMC and lightning strike protection

 

Solution:

1. Cross-Section Design:

• Multi-layer structure: outer shell + damping layer + inner liner
• Reinforcement scheme: variable cross-section, thickened in stress concentration zones
• Shielding design: continuous conductivity, gaps < λ/20

2. Connection System:

• Shock-resistant mounts: multi-directional damping mechanism
• Lightning protection grounding: multi-path low-impedance design
• Sealing treatment: triple-seal redundancy

3. Test Results:

• Shock test: Passed 60g, 11ms half-sine wave
• Salt spray test: 2000 hours without corrosion
• Shielding effectiveness: 70 dB @ 100 MHz – 1 GHz

 

Appendix: Technical Verification Checklist

 

Connection System Acceptance Criteria

1. Torque Test: 100% inspection of all fasteners
2. Pull-Out Test: Corner bracket connection ≥1.5x design load
3. Vibration Test: 3 axes, 2 hours per axis, no loosening
4. Environmental Test: 10 temperature cycles, 95% RH humidity

 

Design Review Points

• Fillet radius R ≥ 3mm in stress concentration zones
• Bolt hole edge distance ≥ 1.5d
• Cooling fin height-to-thickness ratio ≤ 8:1
• Seal groove compression ratio 20%-30%
• Grounding resistance ≤ 0.1 Ω

  

 

Frequently Asked Questions (FAQ) – Custom Aluminum Extruded Cases

 

Q1: What are the design limitations for custom aluminum extruded cases?

A1: Designs must consider mold manufacturability. The minimum wall thickness is typically 0.8mm, and the maximum circumscribed circle diameter is ≤300mm (can reach 400mm with some large extruders). Internal concave structures should be avoided. A minimum fillet radius of R≥0.5mm is recommended to ensure uniform material flow.

 

Q2: Can mounting holes and threads be integrated directly into the extruded case?

A2: Yes. Holes or grooves can be pre-formed during extrusion, but threads usually require secondary machining (CNC tapping) to ensure precision. Deep holes or irregularly shaped holes are recommended for subsequent CNC machining.

 

Q3: Which surface treatments are suitable for aluminum cases used outdoors?

A3: Anodizing (film thickness ≥15μm) or powder coating (epoxy/polyester systems) are recommended. Both provide excellent weather and corrosion resistance. Salt spray test times can reach 500-1000 hours.

 

Q4: How can EMI shielding effectiveness be ensured for the case?

A4: This can be achieved through:

• Designing conductive seams (adding spring finger slots or shielding strip mounting structures)
• Surface coating treatments (e.g., nickel plating, tin plating)
• Selecting 5xxx or 6xxx series aluminum alloys combined with conductive oxidation processes.

 

Q5: Are multi-cavity or internal partition designs supported for one-piece molding?

A5: Yes, multi-cavity structures can be extruded in one piece, suitable for cable isolation, thermal zoning, or modular assembly. However, attention must be paid to wall thickness uniformity to avoid extrusion deformation.

 

Q6: Can the extruded case be bent or formed into curved shapes after extrusion?

A6: Cold bending is possible for thin-walled cases (≤3mm), but deformation allowances must be factored in. For complex curves, segmented extrusion followed by welding is recommended, or aluminum sheet metal bending can be used as an alternative.

 

Q7: How can waterproof sealing be achieved in custom cases?

A7: Designs can integrate O-ring grooves (per AS568 standards), add gasket mounting structures, or employ labyrinth-style waterproof designs. The IP rating can reach up to IP68 (requires combined secondary processing).