Sheet metal enclosures are a workhorse of electronics packaging. They offer strength, EMI shielding, thermal conductivity, and cost efficiency at volume. Getting the fabrication right requires attention to materials, design for manufacturing, and finishing.
Material Selection
Cold-rolled steel offers strength and low cost but needs corrosion protection. Stainless steel resists corrosion and looks premium but costs more and is harder to form. Aluminum is light, conducts heat well, and is ideal for housings that double as heatsinks. Choose based on environment, weight, thermal, and budget.
Design for Manufacturing
Bend radius, hole-to-edge distances, and tolerances must match the fabricator’s capabilities. Standard practices: keep bend radii consistent, avoid placing holes too close to bends, and design for nesting to reduce scrap. Request a DFM review before tooling to catch costly issues early.
- Match material thickness to structural and thermal needs
- Use consistent bend radii across the part
- Plan EMI gasketing and grounding features
- Confirm surface finish and coating standards
Finishing Protects and Presents
Powder coating, anodizing, plating, and silk screening each serve different purposes. Powder coating offers durability and color; anodizing suits aluminum with a metallic finish. Verify adhesion and corrosion test data for the finish on your material.
