Non-standard sheet metal parts = metal thin plate products (typically with a thickness ≤6mm) that lack uniform standards and are customized according to customer requirements. Core characteristics: non-standard dimensions, flexible structure, and function-oriented design.

Complete Customization Process
Phase | Key Actions | Accuracy/Standard
① Drawing Conversion: 3D Modeling → Engineering Drawings → Process Review  
3D Match Accuracy Up to 99.8%
② CNC Cutting  
Laser Cutting/CNC Punching  
Linear Tolerance ±0.1mm
③ CNC Bending  
Electro-hydraulic Servo Bending Machine  
Angle Control ±0.5°, Minimum Bending Radius ≥ Plate Thickness × Coefficient
④ Welding and Assembly    Argon arc welding/laser welding/robot welding    Uniform welds, no cold soldering
⑤ Deburring and polishing with a grinder  
Sanding the weld seams  
Preventing scratches and stress concentration
⑥ Surface Treatment: Powder coating/oven painting/electroplating/phosphating  
Salt spray test: No rust after 48 hours, IPX5 waterproof rating
Patent (CN121374034A) published in January 2026: Designing a process edge with positioning straight lines and isolation grooves for internal bending to reduce the cost of non-standard internal bending.

Common Material Selection
Material    Appllicable Scenario    Precautions
SPCC Cold-Rolled Steel Sheet

Universal structural components, lowest cost  
Require anti-rust coating
SECC electrogalvanized sheet

Enclosures and cabinets, electronic housings: excellent corrosion resistance, not suitable for outdoor use
SGCC hot-dip galvanized steel plate

Outdoor equipment, photovoltaic brackets are relatively hard and have poor ductility
SUS304 stainless steel

The cost is 3 to 5 times that of SPCC in medical/food/chemical environments
5052/6061 aluminum alloy

Lightweight, heat dissipation requirements require anodization treatment
High-strength cold-rolled steel

Heavy machinery and engineering equipment exhibit high strength, requiring careful attention to welding techniques
Four Key Quality Control Metrics
Indicator    Standard    Testing Method
Dimensional accuracy: ±0.05~±0.1mm (high precision up to ±0.02mm)  
CMM Three-dimensional Coordinate Measuring Machine
Flatness ≤0.2mm/m² (tested with a flat plate and feeler gauge)
Corrosion resistance: No rust after 48 hours of salt spray / 1000 hours of salt spray (outdoor components) in a neutral salt spray chamber
Waterproof Rating    IPX5 Splash Test    Splash Test Bench