1. Clearly define the application scenarios
Buildings and doors and windows
External doors and windows: The wall thickness of the main load-bearing rods must be ≥1.8mm (new national standard), the curtain wall profiles must have strong wind pressure resistance, and high-rise buildings should give priority to series with a width of ≥70mm. Broken bridge aluminum profiles block heat transfer through insulation strips and are suitable for energy-saving buildings.
Sliding windows: The cross-sectional width is 60-90mm, which saves space and is suitable for scenes such as balconies and kitchens.
Industrial equipment
Static load-bearing: Select 4040 profiles (40×40mm) for less than 1 ton, and select 8080 profiles (80×80mm) for more than 3 tons.
Dynamic vibration: The bracket of the automation equipment requires 6060-H profiles with a wall thickness of ≥3mm to resist resonance fracture.
Clean environment: The medical and food industries recommend electrophoretic coating profiles to reduce dust adsorption.
DIY and Civilian
Lightweight demand: 2020V1.4 profile (20×20mm, load-bearing 50-80kg) can be selected for shelves and display racks.
Balanced demand: 3030Q1.5 profile (30×30mm, load-bearing 100-150kg) is recommended for workbenches and household machinery frames.
II. Material and performance matching
Alloy grade selection
High strength demand: 6061-T6 alloy (aviation, mechanical structure), tensile strength ≥270MPa.
Economic and general: 6063-T5 alloy (doors and windows, light frames), easy to process and corrosion-resistant.
Extreme environment: 6063-T6 is selected for high temperature scenes, and 5083 aluminum is used for marine environments.
Surface treatment optimization
Anodizing: Improve corrosion resistance (salt spray resistance ≥1000 hours), suitable for industrial scenes.
Powder coating: Various colors, suitable for home decoration needs.
Fluorocarbon coating: Strong outdoor weather resistance, suitable for curtain walls and exterior windows.
III. Key parameter control Size and wall thickness Wall thickness standard: The main profile of external doors and windows is ≥1.8mm, and the wall thickness of heavy industrial profiles (such as 8080) can reach 3mm.
Cross-section size: In industrial scenarios, the larger the cross-section (such as 40×40mm→80×80mm), the load-bearing capacity is doubled.
Accessories and installation National standard profile: Suitable for M4/M6 bolts, the cost is 30% lower than the European standard.
European standard profile: V-groove design is compatible with modular accessories (such as roller bearings) and is suitable for automated equipment rails.
Quick assembly: Use T-bolts + slider nuts to avoid complex cutting.
Fourth, cost control strategy
Budget optimization
Lightweight scenario: 2020 profiles have low unit price (0.25-0.3kg/m), suitable for low-cost projects.
Bulk procurement: Custom processing costs account for 15%-20%, and batch production can reduce costs.
Avoid over-design
Light-load scenarios (such as shelves) do not require heavy profiles (such as 4040), and 2020 profiles can meet the needs.
Five, special scenario adaptation
Electronics and heat dissipation
High-purity 1 series aluminum (such as 1060) is used for radiators, and conductive parts are preferred.
Dynamic load and earthquake resistance
High-frequency vibration equipment needs to increase wall thickness (≥3mm) to avoid fracture caused by resonance.
Summary
Light-load scenario: 2020/3030 profiles, low cost and easy to assemble.
Heavy-load scenario: 4040/8080 profiles, high stability, pressure resistance and earthquake resistance.
Environmental adaptation: Choose anodizing for humid environments, choose 6 series alloy for high temperatures, and use electrophoretic coating for clean scenes.
Cost priority: GB accessories + bulk purchase, scientific selection can reduce costs by 12%-25%.
