What are the requirements for custom sheet metal enclosures?
I. Basic Information Requirements
* **Product Use:** Equipment enclosure / chassis / cabinet / instrument enclosure / waterproof case / decorative enclosure
* **Usage Environment:** Indoor / Outdoor, waterproof and dustproof rating, corrosion resistance
* **Quantity:** Sample / small batch / large batch
* **Delivery Form:** Loose parts (unpainted)
* **Semi-finished products (bent, welded, unassembled)**
* **Finished products (painted + screen printing + 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 steel SPCC:** High cost-performance ratio, requires painting
* **Aluminum AL5052/6061:** Lightweight, anodizable
* **Stainless steel 304/316:** Rust resistant, corrosion resistant
* **Zinc-plated 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
