Fan Casing

Fan Casing Product Technical Specification (Construction Applications)

1. Core Parameters

• Industry: Construction
• Product Name: Fan Casing
• Material: Aluminum Alloy (6061, Standard: GB/T 3880.1-2012)
• Wall Thickness: 2.0 mm
• Surface Treatment: Wiredrawing
• Dimensions: Ø1070 mm × H165 mm
• Dimensional Tolerance: Conforms to GB/T 1804-2000, medium tolerance grade (m)
• Surface Roughness: Ra ≤ 0.8 μm after wiredrawing

2. Manufacturing Process

• Core Process: CNC spinning forming + seam welding, followed by wiredrawing and finishing.
  1. Equipment: Large CNC spinning lathe, automatic GTAW welding machine, fully automatic wiredrawing machine
  2. CNC spinning parameters: spindle speed 600–1000 r/min, roller feed 6–10 mm/s, single-pass deformation 0.4–0.6 mm, wall thickness deviation ≤ ±0.1 mm
  3. Welding: GTAW (argon arc) with current 90–130 A, speed 4–7 mm/s, pure argon protection (≥99.99%), weld penetration ≥1.5 mm
  4. Wiredrawing: mechanical axial direction, speed 12–18 m/min, belt grit 1500#

• Raw Material Pretreatment:
  1. Degreasing in alkali (50–60°C, 4–6% NaOH, 8–12 min)
  2. Water rinse and neutralization
  3. Passivation (10–15% nitric acid, 15–20 min)
  4. Drying (80–100°C, 15–20 min)
  5. Flattening correction: flatness error ≤0.2 mm/m; surface free of oil, oxides, or scratches

• CNC Process Control:
  1. Large CNC spinning lathe with G-code programming
  2. Real-time diameter/height acquisition (12 Hz sampling)
  3. Closed-loop control: Ø1070 mm tolerance ≤ ±0.5 mm, H165 mm tolerance ≤ ±0.3 mm
  4. Port & flange: CNC milling, perpendicularity ≤0.1 mm/m, flange flatness ≤0.15 mm/m

• Post-Processing:
  1. Mechanical deburring (3200 r/min, 2000# grinding wheel) for welds & edges
  2. Compressed air cleaning
  3. Wiredrawing finish
  4. Final dimensional & surface inspection; meets core parameters

3. Quality Control

• Standards: ISO9001:2015; GB/T 3880.1-2012 Aluminum Alloy Building Profiles
• Material Inspection:
  1. Spectrometer check: Mg 0.8–1.2%, Si 0.4–0.8%, Cu 0.15–0.4%
  2. Hardness ≥ 85 HB
  3. Visual + 20× magnifier: no cracks, inclusions, or dents

• Process Inspection: Five key points
  1. CNC spinning: curvature template, adhesion ≥98%
  2. Welding: Ultrasonic testing (UT), per JB/T 4730.3-2005 Class II, defect-free
  3. Dimensions: CMM (accuracy ±0.005 mm), Ø1070 mm, H165 mm, 2 mm wall & flange
  4. Surface wiredrawing: uniform texture, Ra ≤0.8 μm, no skips or scratches
  5. Edges: burr-free, chamfer radius ≥2.0 mm

• Final Inspection: Per GB/T 2828.1-2012, AQL 2.5; includes dimensions, material, surface, appearance, weld, and assembly. Traceable QR code included

4. Production Capacity & Delivery

• Capacity:
  1. 3 large CNC spinning lathes, 6 automatic GTAW machines, 4 wiredrawing machines, 2 CNC mills
  2. Assembly-line operation
  3. Daily output: 30 pcs per line (2 shifts, 8 h/shift), max monthly: 1800 pcs

• Production Time:
  1. Small batch (5–30 pcs): 6–10 working days
  2. Large batch (≥50 pcs): 12–18 working days
  3. Urgent orders: 4–6 working days

• Delivery:
  1. Customized pearl cotton + cardboard + wooden box, 2 pcs/box
  2. Domestic delivery: 3–5 days for major cities, 5–8 days for remote areas
  3. On-site delivery supported, 5 days advance notice required

• Customization:
  1. Sizes Ø500–1500 mm, H100–500 mm
  2. Surface coating: anodizing, powder coating
  3. Flange structure customizable; feasibility review in 3 working days

5. Application Scenarios

• Core Use:
  1. Protection & airflow guidance for building fans (centrifugal, axial)
  2. Locations: rooftops, equipment rooms, basements, exterior vents
  3. Functions: fan protection, airflow convergence, noise reduction

• Operating Conditions:
  1. Temp: -40°C–120°C, Aluminum 6061
  2. Medium: air & non-corrosive building exhaust
  3. Buildings: commercial, offices, industrial, hospitals, schools, subway stations

• Interface Requirements:
  1. Must match Ø1070×H165 mm and corresponding fan model
  2. Flange holes customizable per inlet/outlet, fan specs & drawings required

6. Extended Applications

• Extended Systems: Fire smoke extraction, clean ventilation, industrial high-temp, municipal tunnel ventilation, wind power ventilation systems
• Extended Use Cases:
  1. Fire smoke: high-temp aluminum casing ensures stable operation
  2. Clean ventilation: dust-resistant wiredrawing surface, easy cleaning
  3. Industrial high-temp: protects fans, guides airflow under high temp
  4. Tunnel ventilation: axial fans, humid environments, corrosion-resistant
  5. Wind power: outdoor nacelle ventilation, lightweight, anti-wind load, anti-corrosion

7. After-Sales Service

1. Warranty: 24 months; defects in dimensions, material, welding, surface, installation; free repair/replace; shipping & on-site costs covered by supplier
2. Technical Support: Pre-sales selection, installation manual, drawings, welding report; phone/video guidance; maintenance & anti-rust support during & after warranty
3. Feedback: 24h response; 1–3 working days solution; dedicated follow-up for quality issues
4. Post-Warranty Service: Paid repair, replacement, refurbishment (wiredrawing repair, weld repair, deformation correction); long-term maintenance agreements for inspection 1–2×/year

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