Unternehmensnachrichten über Common Mounting Types for Circular Slitting Blades

Circular slitting blades are core tools in industrial slitting processes (for materials like paper, film, metal foil, and non-woven fabrics). Their mounting type directly impacts slitting precision (e.g., dimensional deviation, edge burrs), equipment operational stability (e.g., vibration, noise), and blade service life. Different mounting types correspond to varying equipment structures, blade specifications (diameter, thickness), and slitting requirements (high/low speed, light/heavy load). For example, small-diameter blades often use sleeve-type mounting, large-diameter blades require flange-type fixing, and high-speed scenarios prioritize keyway-type mounting for torque transmission. This article details 4 common mounting types for circular slitting blades, including their structural features, applicable scenarios, installation key points, and pros/cons. It helps you select the right mounting method for your actual working conditions, avoiding slitting issues caused by improper installation.

Sleeve-type mounting is the most basic and widely used mounting form for circular slitting blades. It secures the blade to the equipment spindle using a "sleeve + nut," featuring simple structure and easy assembly/disassembly. It is suitable for small-diameter, light-load slitting scenarios.

• Core Components: Includes a sleeve matching the blade’s inner hole (usually made of 45# steel with surface roughness Ra ≤ 0.8μm), a fastening nut (typically a thin hexagonal nut), and a washer (to prevent the nut from scratching the blade).
• Mounting Logic: The blade’s inner hole fits over the sleeve, which forms an interference fit with the equipment spindle (clearance ≤ 0.005mm). A nut is then tightened on one side of the blade to secure it via axial pressure, with no additional positioning structure required.

• Blade Specifications: Small-to-medium circular slitting blades with diameter ≤ 150mm and thickness ≤ 3mm (e.g., paper slitting blades, film slitting blades).
• Equipment Types: Small slitting machines (e.g., lab-scale small-batch slitting machines, narrow-width film slitting machines) and manual slitting tools.
• Slitting Requirements: Low-speed slitting (rotational speed ≤ 3000r/min) and light load (slitting force ≤ 50N), such as toilet paper slitting and small-scale packaging film slitting.

• Installation Key Points:
  1. Clean the blade’s inner hole, sleeve, and spindle surface before installation to avoid blade eccentricity caused by impurities.
  2. The fit clearance between the sleeve and the blade’s inner hole must be ≤ 0.01mm; otherwise, the blade will wobble during slitting, leading to dimensional deviation.
  3. Tighten the nut evenly (a torque wrench is recommended, with torque controlled at 5–10N·m) to avoid cracking the blade from over-tightening or blade slipping from under-tightening.
• Pros: Simple structure with fast assembly/disassembly (completed in ≤ 5 minutes); no complex accessories, low cost; compatible with most small-diameter blades.
• Cons: Moderate axial fixing stability—minor blade movement may occur during high-speed slitting (> 3000r/min); cannot transmit high torque, making it unsuitable for slitting thick materials (e.g., metal foil).

Flange-type mounting clamps and secures the blade using "two left-right flanges," providing stable support through the large contact area of the flanges. It is suitable for large-diameter, heavy-load, high-speed slitting scenarios and is one of the mainstream mounting forms in industrial mass-production lines.

• Core Components: Includes a pair of circular flanges (made of aluminum alloy or 45# steel, with diameter 20–50mm larger than the blade and thickness 5–10mm), positioning pins, and fastening bolts (usually 3–6, evenly distributed around the flange edge).
• Mounting Logic: The blade is clamped between two flanges. The flange center is precisely positioned with the equipment spindle via positioning pins (coaxiality ≤ 0.003mm). Bolts are then evenly tightened to secure the blade through the flanges’ clamping force. Meanwhile, the flanges distribute slitting force to reduce blade deformation.

• Blade Specifications: Large circular slitting blades with diameter ≥ 150mm and thickness ≥ 2mm (e.g., corrugated paper slitting blades, metal foil slitting blades, wide-width film slitting blades).
• Equipment Types: High-speed slitting machines (e.g., toilet paper production line slitting machines, lithium battery electrode slitting machines) and heavy-load slitting equipment.
• Slitting Requirements: High-speed slitting (rotational speed 3000–8000r/min) and heavy load (slitting force ≥ 100N), such as wide-width non-woven fabric slitting and lithium battery positive aluminum foil slitting.

• Installation Key Points:
  1. The contact surface between the flanges and the blade must be flat (flatness ≤ 0.005mm); otherwise, uneven blade stress will cause localized excessive wear.
  2. Bolts should be evenly distributed (recommended spacing: 60°–90°) and tightened in "diagonal order" in stages (increasing torque by 5N·m each time) to avoid flange deformation.
  3. After installation, check the blade’s radial runout (≤ 0.002mm); excessive runout will increase edge burrs during slitting.
• Pros: Stable support with no blade movement during high-speed slitting; can transmit high torque, suitable for slitting thick materials; flanges protect the blade edge and reduce collision damage.
• Cons: Complex structure with long assembly/disassembly time (15–20 minutes); high flange cost, requiring customization based on blade diameter, resulting in low versatility.

Keyway-type mounting transmits torque through the cooperation of a "spindle key + blade keyway," with additional axial fixing via a nut or flange. It is suitable for high-speed, high-torque slitting scenarios (e.g., metal material slitting) and prevents blade slipping during high-speed rotation.

• Core Components: Includes a "flat key" on the equipment spindle (made of 40Cr, sized to match the spindle diameter, e.g., 8*7*20mm), a "keyway" machined into the blade’s inner hole (clearance ≤ 0.01mm with the flat key), and an axial fixing nut or flange.
• Mounting Logic: The blade’s keyway aligns with the flat key on the spindle, and the blade is slid onto the spindle. The flat key restricts circumferential rotation of the blade to transmit slitting torque. A nut or flange then fixes the blade axially, achieving "circumferential anti-rotation + axial fixing" dual positioning.

• Blade Specifications: Medium-to-large blades with diameter 50–300mm and thickness 2–5mm (e.g., steel sheet slitting blades, copper foil slitting blades, cemented carbide slitting blades).
• Equipment Types: Metal slitting machines and high-speed precision slitting machines (e.g., electronic component lead frame slitting machines).
• Slitting Requirements: High-speed slitting (rotational speed > 5000r/min) and high torque (slitting force ≥ 200N), such as stainless steel thin sheet slitting and lithium battery negative copper foil slitting.

• Installation Key Points:
  1. The fit clearance between the key and keyway must be strictly controlled (0.005–0.01mm); excessive clearance causes key wear during slitting, while insufficient clearance makes it difficult to slide the blade onto the spindle.
  2. Ensure the key is fully inserted into the keyway during installation; partial contact will cause localized excessive stress and keyway cracking.
  3. Axial fixing must be secure (nut torque recommended: 15–25N·m) to prevent axial blade movement during high-speed rotation.
• Pros: Effectively transmits high torque with no slipping during high-speed slitting; high slitting precision (dimensional deviation ≤ 0.02mm); suitable for slitting hard materials like metal.
• Cons: Requires keyway machining in the blade’s inner hole, increasing manufacturing cost; stress concentration easily occurs at the keyway, leading to cracking for thin blades (thickness ≤ 1mm); alignment of the key and keyway is required during assembly, making it more complex than sleeve-type mounting.

Taper-sleeve-type mounting secures the blade using the "self-locking principle of the taper sleeve’s conical surface," requiring no keyway machining and enabling fast assembly/disassembly. It is suitable for production lines requiring frequent blade changes (e.g., small-batch multi-variety slitting scenarios).

• Core Components: Includes a tapered sleeve (with a conical inner hole matching the spindle’s conical surface, made of 45# steel), a locking nut, and a washer.
• Mounting Logic: The tapered sleeve fits over the spindle’s conical surface, and the blade’s inner hole slides onto the sleeve’s outer cylindrical surface. Tightening the locking nut applies axial force to shrink the taper sleeve, which secures the blade to the spindle via friction on the conical surface. The conical fit also ensures high coaxiality.

• Blade Specifications: Medium-to-small blades with diameter 80–200mm and thickness 1–3mm (e.g., label paper slitting blades, small film slitting blades).
• Equipment Types: Slitting machines requiring frequent blade changes (e.g., multi-variety packaging film slitting machines, lab-scale variable-specification slitting machines).
• Slitting Requirements: Medium-speed slitting (rotational speed 2000–5000r/min) and frequent blade changes (≥ 5 changes per day), such as food packaging film slitting and cosmetic label slitting.

• Installation Key Points:
  1. The contact area between the taper sleeve and the spindle’s conical surface must be ≥ 90%; otherwise, effective self-locking cannot be achieved, leading to slipping during slitting.
  2. Tighten the nut in one go (a torque wrench is recommended, with torque 10–15N·m); avoid staged tightening to prevent uneven stress on the taper sleeve.
  3. Use a dedicated puller tool to remove the taper sleeve from the spindle during disassembly; avoid hammering (which damages the conical surface).
• Pros: Fast assembly/disassembly (completed in 3–5 minutes), suitable for frequent blade changes; no keyway machining required, reducing blade cost; high coaxiality from conical fit (≤ 0.005mm), ensuring stable slitting precision.
• Cons: Limited self-locking force, unsuitable for high-torque slitting (slitting force ≤ 100N); the taper sleeve must match the spindle’s conical surface precisely, resulting in low versatility (different tapers require different sleeves).

For intuitive selection, the core parameters of the 4 mounting types are summarized below:

Regardless of the mounting type, the following 4 general precautions must be followed to prevent reduced slitting precision, rapid blade wear, or equipment failure:

1. Prioritize Cleaning: Clean the blade’s inner hole, spindle, sleeve/flange, and other components before installation to remove oil, iron filings, and impurities. Impurities cause blade eccentricity, leading to dimensional deviation (e.g., > ±0.1mm) and accelerated wear of the blade’s inner hole.
2. Check Coaxiality: After installation, use a dial indicator to check the blade’s radial runout (recommended ≤ 0.002mm). Excessive runout increases edge burrs (e.g., > 0.02mm) and damages equipment bearings over time.
3. Control Torque: Use a torque wrench to tighten nuts or bolts according to the recommended torque. Over-tightening deforms the blade (e.g., excessive flatness deviation) or causes cracking; under-tightening leads to blade slipping and "drag marks" during slitting.
4. Balance Testing: For blades with diameter ≥ 200mm or rotational speed ≥ 5000r/min, perform dynamic balance testing after installation (balance accuracy ≤ G2.5). Imbalance causes equipment vibration (noise > 80dB) and accelerates wear of the blade and spindle.

There is no "best" mounting type for circular slitting blades—only the "most suitable" one. Choose sleeve-type for small-diameter, low-speed applications; flange-type for large-diameter, high-speed scenarios; keyway-type for high-torque metal slitting; and taper-sleeve-type for frequent blade changes. The key is to comprehensively judge based on 4 dimensions: blade specifications, equipment speed, slitting material, and blade change frequency. Avoid "over-engineering" (e.g., using flange-type for small-diameter blades to increase cost) or "under-engineering" (e.g., using sleeve-type for large-diameter blades to cause unstable slitting).

As a professional in the tungsten carbide industry, when recommending blades, you should also understand the customer’s equipment mounting structure (e.g., whether the spindle has a conical surface or keyway), then provide matching blade inner hole specifications (e.g., with or without keyway) and attach installation guidelines to help customers avoid blade scrapping due to improper installation.