In modern manufacturing, sheet metal design is a key driver of cost and efficiency, with studies showing that up to 70% of a part’s cost is determined during the design phase; leveraging today’s advanced equipment—such as laser cutting, CNC bending, robotic welding, and eco-friendly coating lines—engineers can apply seven proven strategies to simplify structures, optimize manufacturability, and reduce production costs while improving speed and consistency.
1. Simplify Structures to Avoid Unnecessary Complexity
Simpler structures are easier to manufacture, more stable, and cost-effective.
Design considerations:
- Avoid deep cavities, narrow blind spots, and complex bending geometries.
- Replace irregular curves with straight bends to reduce laser cutting time.
- Use symmetrical structures wherever possible to simplify fixturing and positioning.
- Optimize sheet layouts to minimize material waste.
Simplified structures not only reduce costs but also improve consistency in mass production.
2. Use Standard Material Thickness and Common Specifications
Material costs often account for the largest portion of sheet metal expenses. Choosing standardized sheet metal can significantly reduce procurement costs and lead times.
Recommended thicknesses:
- Cold-rolled / galvanized steel: 1.0 / 1.2 / 1.5 / 2.0 mm
- Stainless steel: 0.8 / 1.0 / 1.2 mm
- Aluminum: 2.0 / 2.5 / 3.0 mm
Avoid:
- Non-standard thicknesses like 1.1, 1.3, or 1.8 mm
- Special alloys unless functionally required
- Standardized materials facilitate bulk purchasing, inventory management, and processing stability.
3. Follow Bending Guidelines to Improve First-Pass Yield
Bending is one of the most detail-sensitive processes in sheet metal fabrication.
Key rules:
- Minimum flange height ≥ sheet thickness × 2.5–3
- Bending radius matching thickness: typically R = T or R = 0.5T
- Ensure adequate spacing for Z-shaped bends to prevent interference
- Avoid extremely small flanges or short notches
- Design bend directions considering mass production tooling and automation
- Proper bending design reduces rework, deformation, and scrap rates.
4. Optimize Connections: Use Structural Solutions Instead of Fasteners
Fasteners and manual assembly costs are often underestimated, especially in mass production.
Cost-reduction strategies:
- Replace screws with snap-fits or flanged connections
- Substitute rivets with integrated bends or locational features
- Combine multiple parts into a single unfolded or modular structure
- Introduce interlocking or sliding connections to reduce screws and labor
This “structural replacement of hardware” approach is a key cost-saving method in many products.
5. Minimize Welding: Bend Instead of Weld, Spot Weld Instead of Full Weld
Welding costs accumulate through labor, consumables, grinding, and corrections, making it a major contributor to processing expenses.
Design strategies:
- Use bends to replace long weld seams
- Replace full welds with spot welding where structural requirements allow
- Shorten weld lengths to reduce heat distortion
- Add positioning holes to simplify fixturing
- Modularize structures to reduce weld points and improve consistency
Even with robotic welding, complex parts often require manual intervention. Minimizing welding remains the most direct cost-saving path.
6. Standardize Holes, Slots, and Reinforcements for Processing Stability
Improperly designed holes or slots can lead to instability in mass production and high rework costs.
Design recommendations:
- Minimum hole diameter ≥ sheet thickness × 1.2
- Minimum edge distance ≥ sheet thickness × 2
- Laser slot width ≥ sheet thickness × 1.1
- Add reinforcements to prevent deformation in large panels
- Reserve reliefs at bends to avoid tool interference
- Use positioning holes to improve welding and assembly efficiency
- Attention to these details directly impacts production stability.
7. Standardize Surface Treatments to Avoid Process Overlap
Surface treatment significantly affects cost and lead time. Multiple overlapping processes quickly drive up expenses.
Best practices:
- Apply one type of finishing per product (spray coating, anodizing, or plating)
- Avoid post-weld touch-ups before coating to minimize sanding marks
- Use galvanized steel with spray coating for large panels for cost-effectiveness and durability
- Maintain consistent processes for visible components to ensure uniform color and texture
- Consistent surface treatment reduces process switches and improves first-pass yield.
8. Implement DFM Early to Make Designs Manufacturable
Design for Manufacturability (DFM) has become essential in sheet metal development. Early collaboration with suppliers on the following points can significantly reduce modification and rework costs:
- Available bending tools and mold specifications
- Laser cutting layout strategies
- Welding methods (manual vs. robotic)
- Tolerance levels
- Feasibility of surface treatments and color requirements
The earlier these discussions occur, the more cost-efficient and production-ready the design becomes.
Conclusion: Smart Design = Cost Savings + Stability + Faster Delivery
Sheet metal cost optimization does not mean compromising quality. By simplifying structures, standardizing materials, reducing welding, minimizing process switches, and integrating DFM thinking, manufacturers can reduce production costs while maintaining product stability.
Meiding Industrial, with a complete sheet metal manufacturing chain, offers structural optimization, manufacturability evaluation, and mass-production guidance, helping products achieve cost competitiveness from the design stage.