Today, Huilisheng will guide you through an analysis of common issues with tungsten carbide cutting blades:

1. Rapid Wear and Severely Shortened Lifespan
Under normal conditions, when a company uses the same tungsten carbide blade grade with consistent geometry and hardness, the blade’s lifespan should remain relatively stable. If the lifespan of a circular blade drops sharply, the following factors should be investigated:

1. Appropriate Grinding Wheel Grit Size:

• If the diamond grit of the grinding wheel is too fine, it becomes difficult to achieve a sharp cutting edge.

• If the grit is too coarse, the blade will wear out quickly.

2. Excessive Grinding Frequency, Prolonged Grinding Time, or Excessive Grinding Pressure:

• With properly matched blades and grinding wheels, a tungsten carbide blade with a sharp edge (typically at an angle of 25°–32°) does not require frequent regrinding.

• Often, incorrect grinding fails to produce a proper edge (or the edge angle is too small), resulting in burrs during corrugated paper cutting and necessitating frequent regrinding, which severely shortens the blade’s lifespan.

2. Burrs or Collapsed Edges on Cut Corrugated Paper

1. Dull Blade or Improper Edge Grinding:

• If the cutting edge appears as a thin white line under inspection, it indicates a lack of sharpness, and regrinding parameters should be adjusted.

2. Excessive Moisture in Corrugated Paperboard:

• Overly damp paperboard lacks the necessary hardness and strength for clean cutting.

3. Tungsten Carbide Circular Blade Cracking

1. Improper Blade Installation:

• If cracking occurs during trial operation or shortly after installation, it suggests improper assembly. The blade must be centered correctly and must not collide or rub against any hard objects. Asymmetric force during edge grinding can also cause cracks.

2. Friction from Loose Adjacent Components:

• If cracking occurs after prolonged use, it is often due to friction caused by loose neighboring parts or a stuck grinding wheel spindle. Regular inspection is essential, particularly checking for friction marks on the blade surface.

3. Accidental Collision:

• Impact during operation can lead to cracking.

4. Jagged or Chipped Edges After Regrinding

• This is typically caused by a loose grinding wheel, stuck bearings, or unstable wheel rotation leading to wobbling.

• In severe cases, irregular grinding can result in a non-circular or polygonal blade profile, which may eventually cause blade breakage.

Note: All the above issues assume that the tungsten carbide blade itself meets quality standards. If the blade is of inferior quality, the above analysis may not apply.