Large Sheet Metal Shell

Large sheet metal shell

Requirements for Custom Sheet Metal Housings

I. Basic Information Requirements
Product Application: Equipment Housing / Chassis / Cabinet / Instrument Housing / Waterproof Box / Decorative Housing
Usage Environment: Indoor / Outdoor, Waterproof and Dustproof Rating, Corrosion Resistance
Quantity: Prototype / Small Batch / Large Batch
Delivery Form: Unfinished Parts (Unpainted)
Semi-finished Products (Bent, Welded, Unassembled)
Finished Products (Painted + Silk Screen Printed + Assembled)

II. Dimensions and Tolerances
External Dimensions: Length × Width × Height
Key Installation Dimensions, Hole Tolerances (Generally ±0.1~±0.5mm)
Flatness, Perpendicularity, Warpage Requirements
Bending Angle, Radius (R-angle) Requirements

III. Material Requirements
Commonly Used:
Cold-rolled SPCC: High cost-performance ratio, requires painting
Aluminum AL5052/6061: Lightweight, anodizable
Stainless Steel 304/316: Rust-proof, corrosion-resistant
Galvanized Steel SECC: Good rust resistance, suitable for chassis.
Requires specifying:
Material grade
Sheet thickness (0.8/1.0/1.2/1.5/2.0/2.5/3.0mm)
IV. Structural and Process Requirements
Processing Technology
Laser cutting / CNC punching
CNC bending
Welding: Argon arc welding, spot welding, full welding, splicing welding
Tapping, countersinking, reaming, press-fit nuts / studs
Structural Details
Reinforcing ribs, flanges, ventilation holes, louvers
Opening Method: Flip-top, side door, removable panel
Installation Method: Wall-mounted, floor-standing, recessed
V. Surface Treatment Requirements
Spraying: Electrostatic powder coating (color according to color card number, e.g., RAL7035)
Anodizing (aluminum): Natural color / Black / Silver
Brushing, sandblasting, polishing
Electroplating: Zinc plating, chrome plating
Rust Prevention Treatment: Phosphating, passivation
VI. Appearance and Marking
Surface free of scratches, shrinkage cavities, exposed substrate, and burrs
Silk screen printing / Laser engraving: Logo, text, warning labels
Color difference requirements, gloss level (matte/semi-gloss/glossy)
VII. Waterproofing, dustproofing, and protection level
IP rating: e.g., IP54/IP65
Sealing strips, waterproof gaskets, waterproof joints
Uniform gaps, no risk of leakage
VIII. Assembly and accessories
Hinges, handles, locks, casters, foot pads
Cooling fans, filters, shielding materials
Grounding and conductivity requirements (EMC/shielded enclosure)
IX. Drawings and documents
Provide: 3D drawings (STEP/SLDPRT) + 2D engineering drawings (DWG/PDF)
Drawing annotations: Dimensions, tolerances, materials, surface treatment, critical parts
X. Inspection and packaging
Full dimensional inspection/sampling inspection
Full appearance inspection
Packaging: Pearl cotton + cardboard box + wooden frame, scratch and impact resistant

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