Алюминиевые листы с покрытием are widely used in construction, Автомобиль, вывески, and industrial manufacturing. Their lightweight structure, устойчивость к коррозии, and long service life make them ideal for demanding environments. Однако, bending coated aluminum without damaging the surface coating can be challenging. Царапины, peeling, and micro-cracks not only affect appearance but also reduce product durability.
This guide explains the best practices and proven techniques to bend coated aluminum sheets smoothly and safely—while keeping the surface fully protected.
How to Bend Coated Aluminum Sheets Without Damage
1. Understand the Properties of Coated Aluminum Sheets
Before forming, it’s important to understand factors that influence bending performance.
• Coating Types
PVDF coatings – excellent UV resistance; require controlled bending
Polyester coatings – economical, moderate flexibility
Anodized coatings – hard surface, lower flexibility during forming
• Sheet Thickness
Thicker sheets reduce cracking risk but require larger bend radii.
• Temperature Sensitivity
Some coatings soften under heat while others become brittle. Always check the coating’s temperature tolerance before applying heat.
2. Prepare Tools, Machines, and Work Surfaces
A proper setup greatly reduces coating damage.
• Work Surface Preparation
Keep the table clean and smooth
No metal debris or burrs
• Tooling Protection
Use rubber pads, plastic pads, or soft inserts
Avoid direct metal-to-metal contact
• Recommended Equipment
CNC press brakes with protective dies
Roll-forming machines for long or curved shapes
3. Bending Techniques for Damage-Free Forming
• Air Bending
Minimal tool contact reduces coating stress.
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