Expanded Metal Manufacturing Process: Full Step-by-Step Guide
ANPING METAL MESH – Professional Metal Mesh Manufacturing Since 2005
The expanded metal manufacturing process is a precise, industrial method that transforms solid metal sheets or coils into strong, lightweight expanded metal mesh by slitting and stretching the material. This process creates no waste, making it eco-friendly and cost-effective for industrial and construction applications.
As a leading expanded metal manufacturer based in Anping County – the global Wire Mesh Capital – we use fully automated CNC production lines to ensure consistent quality, accurate dimensions, and high efficiency. Our expanded metal products are used in facade systems, construction, machinery, agriculture, and storage solutions worldwide.
Overview of the Expanded Metal Manufacturing Process
Expanded metal production is a cold-forming process that converts solid metal coils into diamond-patterned mesh without cutting or wasting material. Unlike perforated metal or welded mesh, expanded metal retains 100% of the original metal volume, resulting in higher strength and lower production costs.
The entire process is automated, controlled by CNC systems to guarantee uniform diamond openings, strand thickness, and sheet flatness. Our production lines handle steel, galvanized steel, aluminum, stainless steel, and other alloys for diverse industrial needs.
Full Step-by-Step Expanded Metal Manufacturing Process
Below is the complete, industrial-grade production flow used in our ISO-certified factory:
Step 1: Raw Material Preparation & Uncoiling
The process begins with high-quality metal coils (cold-rolled steel, galvanized steel, aluminum, or stainless steel). The coils are loaded onto automatic uncoiling machines that feed the flat metal sheet into the production line steadily and evenly.
Material thickness ranges from 0.2mm (for laths) to 8mm (for heavy-duty grating), depending on the final product application.
Step 2: Leveling & Straightening
The metal sheet passes through a precision leveling machine to remove curvature, warping, or unevenness from the coil. This step ensures a perfectly flat base for accurate expanding and slitting.
Step 3: CNC Slitting & Stretching (Core Process)
This is the most critical stage of the expanded metal manufacturing process. The flat sheet enters a CNC-controlled expanding machine equipped with special cutting knives and dies.
The machine simultaneously slits the metal into parallel patterns and stretches it vertically, forming the characteristic diamond openings. The CNC system controls:
- Diamond opening size (SWD / LWD)
- Strand width and thickness
- Expansion ratio
- Production speed
Step 4: Flattening (Optional)
Standard expanded metal has a raised, 3D surface. For applications like fence panels, cabinets, or decorative facades, the mesh passes through a heavy flattening roller to create a smooth, flat surface.
Step 5: Surface Treatment
To improve corrosion resistance and appearance, the expanded metal undergoes surface finishing:
- Hot-dip galvanizing (for outdoor/agricultural use)
- Electro-galvanizing (for indoor products)
- Powder coating (color customization)
- Stainless steel passivation (for hygiene applications)
Step 6: Cutting to Size
The continuous expanded metal mesh is cut into standard sheets (4×8 ft) or custom sizes using automatic shearing machines. We can produce rolls, sheets, or fabricated parts based on customer requirements.
Step 7: Inspection & Quality Control
Every batch undergoes strict inspection for dimensional accuracy, surface quality, opening uniformity, and material strength. Only products meeting ASTM, EN, and ISO standards are approved for packaging.
Step 8: Packaging & Shipping
Finished expanded metal products are packed with waterproof film and wooden pallets to prevent damage during global shipping. We deliver to over 50 countries worldwide.
Key Parameters Controlled in Manufacturing
| Parameter | Full Name | Control Range | Function |
|---|---|---|---|
| SWD | Short Way of Diamond | 3mm – 100mm | Opening Width |
| LWD | Long Way of Diamond | 6mm – 200mm | Opening Length |
| Strand W | Strand Width | 1mm – 10mm | Strength & Rigidity |
| Thickness | Material Thickness | 0.2mm – 8mm | Load Capacity |
Advantages of Our Manufacturing Process
Our automated expanded metal manufacturing process delivers superior benefits compared to traditional methods:
- Zero Material Waste: 100% material utilization (eco-friendly & low cost)
- High Precision: CNC control ensures consistent opening size
- Stronger Structure: No welds, single-piece construction
- High Efficiency: Continuous coil feeding for mass production
- Wide Material Compatibility: Steel, aluminum, stainless, copper, etc.
- Customization: Flexible size, opening, and finish options
Frequently Asked Questions: Manufacturing Process
What is the expanded metal manufacturing process?
Is expanded metal welded?
How is the diamond shape created?
What materials can be expanded?
What is the difference between expanded and perforated metal?
Can you produce custom expanded metal?
Our Manufacturing Capabilities
With 20+ years of experience in metal mesh manufacturing, we operate 18 advanced expanded metal production lines with these capabilities:
- Monthly output: 1,500+ tons of expanded metal
- Material thickness: 0.2mm – 8mm
- Maximum sheet size: 2m × 6m
- CNC automatic control system
- ISO 9001, CE, ASTM certified
- OEM & ODM custom fabrication services
Our process supports mass production for industrial clients and small-batch customization for specialized projects like architectural facades, tractor supply parts, and storage cabinets.
Custom Expanded Metal – Manufactured to Your Specs
Free quotation | full CNC customization | ISO-certified process | global delivery
Request Quote Now