Rotary Slitter Blades for Metal Processing

Rotary Slitter Blades: Definition, Uses & Key Info

What Are Rotary Slitter Blades?

Main Uses

• Cut wide metal coils (steel, stainless steel, aluminum, copper, etc.) into narrow strips

• Essential for metal coil deep processing in many industries

• Affect cut edge flatness, burr-free quality, and production efficiency

Achieving Micron-Level Precision with CNC

• Even a 0.002mm error can cause uneven edges and costly burrs

• ALAS rotary slitter blades use in-house precision CNC grinding

• Ensures tight tolerances for flatness and parallelism

• Guarantees clean cutting of stainless steel, aluminum, and high-strength alloys at high speeds

Core Features

High Hardness & Long Life

• Made from high-quality materials (Cr12MoV, SKD11, high-speed steel, cemented carbide)

• Professional heat treatment (vacuum quenching, deep cryogenic treatment)

• Hardness: HRC58-62

• Optional nitriding/TiN coating for better wear and impact resistance

• Reduces blade changes and production costs

Micron-Level Precision & Burr-Free Edges

• Cutting edge tolerance controlled at micron level

• Strict control of runout and end face runout

• Flat, non-curled, burr-free edges after slitting

• No need for secondary processing; faster downstream production

Full Customization & Machine Compatibility

• Customizable: outer diameter, inner diameter, thickness, cutting edge angle

• Fits all types of slitting machines

• Supports circular, irregular shapes, and upper/lower blade sets

High-Speed Stability

• Uniform heat treatment, minimal deformation

• Stable operation at high speeds (no wobbling)

• Consistent slitting dimensions; less waste, higher coil usage

Main Types

• Circular Slitter Blades: Most common, disc-shaped. Adjust to cut different widths. Suitable for standard metal coils (steel, aluminum, etc.).

• Irregular-Shaped Blades: Custom designs (stepped, beveled edges). For hard-to-process materials (thick coils, special alloys).

• Upper/Lower Matching Blades: Used together as a cutting pair. Standard for all slitting machines; fits all coil sizes.

Applicable Industries

• Metallurgy: Slit large coils (steel, aluminum, stainless steel) to standard widths before shipping.

• Metal Processing: Secondary slitting of coils into custom narrow strips for customers.

• Automotive & Home Appliances: Precision slitting for car parts, appliance casings, and hardware.

• Special Materials: Slit surface-treated coils (galvanized, color-coated, copper, titanium) without damaging surfaces.

Core Processing Technology

• Material Selection: High-toughness alloy tool steel/high-speed steel; high-end models use cemented carbide.

• Heat Treatment: Vacuum quenching for uniform hardness and better toughness (prevents chipping).

• Precision CNC Machining: CNC lathes/grinders for tight tolerances and accurate assembly.

• Custom Cutting Edge: Small angle for thin materials; large angle for thick/hard materials. Polished for burr-free cutting.

• Surface Strengthening: Nitriding/TiN coating for higher hardness, less friction, and less material sticking.

Daily Use & Maintenance (Extend Lifespan)

Installation Tips

• Check for chipping/burrs on the cutting edge before installation

• Ensure blade and spindle are coaxial; tighten securely

• Prevent wobbling/loosening during high-speed operation

Parameter Adjustment

• Adjust blade spacing and cutting gap based on material type and thickness

• Too large gap = burrs; too small gap = more wear

Operation & Storage

• Clean metal chips promptly to avoid scratching the cutting edge

• Apply rust protection to idle blades

• Store in a dry, flat place; avoid collisions

Engineering Solutions, Not Just Commodities

• We are your application engineering partner, not just a supplier

• Analyze your coil thickness and line speed to provide custom gap and coating advice (TiN, DLC)

• Choosing ALAS reduces downtime and improves edge quality, lowering total cost of ownership (TCO)