ODM Sheet Metal Fabrication Exporter & Factories

The selection depends primarily on annual production volume, part geometry, material thickness, and tolerance requirements:

• Laser Cutting & CNC Bending: Ideal for prototype to medium-volume runs (1 to 5,000 pieces). Eliminates costly hard tooling costs (NRE), allows fast design modifications, and supports sheet thicknesses from 0.5mm up to 25mm.
• Precision Metal Stamping: Recommended for high-volume production (10,000+ pieces). Requires initial investment in progressive dies or stage tooling, but offers exceptionally low piece-part costs, high speed (up to 120 strokes/min), and repeatable tight tolerances.
• CNC Milling/Turning: Used when parts require complex 3D features, thick solid sections (>25mm), blind pockets, or extreme dimensional tolerances (down to ±0.005mm) that exceed standard sheet metal bending limits. Often combined with sheet metal in hybrid structural assemblies.

K-Factor represents the ratio of the neutral axis position to the sheet metal thickness during bending. Our engineers calculate K-Factor based on specific material yield strength, V-die opening width, and bend method (air bending vs. bottoming):

Standard empirical values used in our CAM software include: K=0.33 for soft aluminum air bending, K=0.38-0.42 for cold rolled steel, and K=0.45 for stainless steel bottoming. By precisely modeling Bend Deduction (BD) = 2 * OSSB (Outside Setback) - BA (Bend Allowance), we ensure flat pattern CAD developments match final 3D folded dimensions without manual filing or rework.

We provide a comprehensive array of functional and decorative surface treatments engineered to resist corrosion, improve wear resistance, or enhance conductivity:

• Anodizing: Type II Clear/Color Anodizing, Type III Hardcoat Anodizing (with or without PTFE coating) for aluminum components.
• Powder Coating & Liquid Painting: Architectural grade polyester/epoxy powder coating matching RAL color codes, textured or smooth, passing 500-1000h salt spray tests.
• Plating & Chemical Conversion: Electro-galvanizing (Zinc plating with blue/yellow chromate), Nickel plating, Gold/Silver plating for contacts, Chromate Conversion (Alodine 1200 / SurTec 650) for aerospace aluminum.
• Passivation & Electropolishing: Citric/Nitric acid passivation for 300-series stainless steel to remove free iron and maximize corrosion resistance.

We maintain a strict ISO-compliant Engineering Change Order (ECO) protocol. When a customer submits a design revision:

1. All current shop-floor production routing sheets and CNC programs are immediately paused via our ERP system.
2. Engineers perform a delta analysis on the new 3D/2D CAD files to evaluate impacts on tooling, flat patterns, unit pricing, and lead time.
3. Unused semi-finished inventory is audited, and scrap or rework costs are transparently communicated.
4. Revised revision control numbers (e.g., Rev A to Rev B) are updated across drawing files, CMM programs, and box labeling before production resumes.

Every shipment is packaged with a complete Quality Quality Assurance Dossier, including:

• First Article Inspection (FAI) Report per AS9102 or standard CMM format.
• Raw Material Mill Test Certificate (MTR) with chemical composition and mechanical strength analysis.
• RoHS 3.0 (2015/863/EU) and REACH (EC 1907/2006) Certificate of Compliance.
• Plating/Coating Thickness Measurement Report (X-ray or Magnetic gauge verification).
• Final Outgoing Quality Control (OQC) dimensional inspection check-sheet signed by senior QC auditors.

Standard operational lead times are organized as follows:

• Rapid Sheet Metal Prototypes: 3 to 7 working days for laser cutting, bending, and basic surface finishing. Express 48-hour turnarounds are available for critical DFM evaluation samples.
• Pre-Series / Low-Volume Production: 10 to 15 working days for orders ranging from 50 to 500 units.
• Mass Production with Stamping Tooling: 20 to 30 calendar days for progressive die design, fabrication, T1 sample approval, followed by batch production at speeds up to thousands of parts daily.