Industrial Circular Slitting Knives

Introduction Circular slitter knives lose performance through edge rounding, micro-chipping, pickup and repeated grinding. Immediate replacement is not always necessary. A dimensionally sound knife can often be resharpened, while a cracked, distorted or undersized knife may be unsafe to reuse. Base the decision on slit quality, measured condition, machine limits and service history. Quick answer: Resharpen a structurally sound knife when grinding can restore its edge within dimensional limits. Replace it when damage, distortion, excessive material loss or unstable performance cannot be corrected reliably.     1. Recognize the Cutting Signs of Knife Wear The slit edge is usually the first warning. Increasing burr height, tearing, inconsistent fracture or a repeating line d...

Introduction Burrs on slit metal edges can damage downstream tooling, reduce forming accuracy, create handling hazards and increase scrap. A dull circular slitter knife may be involved, but burrs usually reflect the complete slitting system. In rotary shear slitting, upper and lower knives deform the strip and guide it toward fracture. A finished edge normally contains rollover, a burnished zone, a fracture zone and a small burr. The goal is to keep burr height within specification and consistent across every lane. Quick answer: Match knife clearance and overlap to the coil, maintain sharp and concentric tooling, stabilize the line and measure the result after each controlled adjustment.   1. Read the Slit Edge Before Changing the Setup Inspect both sides of representative str...