STEEL SLITTING PROBLEMS include; edge waves, crossbow, knife marks, burrs, camber, and inconsistent slit widths. some of these issues may be creat by poor material quality, but more often caused by disorders which happen in the system during the coil slitting process. LOTOSFORMING discuss slitting problems and present solutions to reduce possible problems.

PROBLEM      /   POSSIBLE CAUSE

What arises Problems during metal slitting?

How to avoid slit-in coil slitting problems?

Many issues can happen in steel slittings such as poor edge quality, edge burr, edge wave, camber, crossbow, knife marks, and slit width.

  • Too much BURR generated from slit process
  1. Too Much side pressure
  2. Wrong main shaft angle
  3. Excessive blade penetration
  4. Dull or incorrectly resharpened blades
  5. Slitter shaft vibration in high speed

Burr is an edge fault that accrues during slitting. The primary cause of burr is a horizontal knife clearance that is very tight or very weak. A wrong clearance spontaneously causes a poor-quality edge. In fact, one of the specifications of a poor-quality edge is a burr.

  • Top knives chipping
  1. Too Much side pressure
  2. Too little blade overlap
  3. Radial runout in the top knife
  4. Top knife jumping out during operation

Extensions to the COIL STEEL SLITTING PROBLEMS :

  • Blade life too short
  1. Blade incorrectly resharpened (burred cutting edges – heavy burrs)
  2. Excessive blade penetration too deep – too shallow
  3. Too much side pressure
  4. Excessive cant angle
  5. Radial runout
  6. Axial runout or wobbling in lower knife

 

  • Ragged edge on ONE side of steel strips
  1. Cant angle much too steep
  2. Blade penetration too deep
  3. Blade cutting angle incorrectly selected and/or sharpened

 

  • Ragged edge on both sides of a cut
  1. Blade angle incorrectly selected
  2. Cant angle much too steep
  3. Blade penetration too deep
  4. Blade cutting angle incorrectly selected and/or sharpened
  5. Incorrect offset
  6. Radial runout
  7. Heavy vibration at high speed

 

PROBLEM THAT OCCURS IN METAL SLITTING?

  • Scallop slit line
  1. Axial runout on lower knife

 

  • Web folds between blades are not cut
  1. Negative cant angle
  2. Blades improperly reground
  3. Side pressure too light

 

  • Tearing of web  at a cut point
  1. Incorrect trim removal
  2. Blade penetration too deep. Web not truly tangent to the top point of a bottom knife

 

All you need to know about Solve Steel Slitting Problems :

  • Interrupted slitting
  1. Nicked or damaged cutting blades
  2. Radial runout of either top knife or bottom knife or both
  3. Side pressure too light

 

  • Web breaks
  1. Nick on any edge of a knife (usually a top knife)
  2. Web tensions too high
  3. Web not truly tangent
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