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COVID-19: How Kennametal is responding

Troubleshooting Solid Carbide Drilling

Heavy Wear on the Cutting Corners

Source
  • Insufficient Coolant
  • Cutting Conditions
Solution

Check cooling lubricant. In the case of
internal coolant supply, increase coolant
pressure. In the case of external coolant
supply, adjust positioning of coolant jet.
Cool from both sides.

Reduce cutting speed, increase feed.

Thermal Checking / Comb Cracking

Source
  • Cutting Conditions
Solution

Inconsistent/insufficient coolant supply.

Splintering on the Chisel Edge

Source
  • Clamping Chuck
  • Cutting Conditions
Solution

Check clamping accuracy. Use hydraulic
clamping chuck or high-precision chucking system.

Increase feed.

Build-Up Edge

Source
  • Insufficient Coolant
  • Cutting Conditions
Solution

Check cooling lubricant. In the case of
internal coolant supply, increase coolant
pressure. In the case of external coolant
supply, adjust positioning of coolant jet.
Cool from both sides.

Increase speed 20-30%.

Splintering on the Cutting Edges

Source
  • Clamping Chuck
  • Cutting Conditions Caused By Build-Up Edge
Solution

Check clamping accuracy. Use hydraulic
clamping chuck or high-precision chucking system.

Check cutting values and, possibly increase cutting speed.
Examine regularly for built-up edge.

Heavy Wear on the Cutting Corners

Source
  • Workpiece Movement
  • Insufficient Coolant
  • Wrong Drill
  • Cutting Conditions
Solution

Stabilize workpiece chucking and check
stability of machine tool.

Check cooling lubricant. In the case of
internal coolant supply, increase coolant
pressure. In the case of external coolant
supply, adjust positioning of coolant jet.
Cool from both sides.

Check drill type, drilling depth, cooling
system, and workpiece material.

Check cutting parameters at exit. Reduce
feed 15-20% prior to breakout.

Hole Too Big

Source
  • Cutting Conditions
  • Clamping Chuck
  • Wrong Drill
Solution

Check cutting values, increase cutting
speed, or reduce feed.

Check clamping accuracy and torque
transmission. Use hydraulic clamping chuck or high-precision chucking system.

Check drill diameter. Please notice that
drills are ground to a positive tolerance.
Check concentric running.

Hole Too Small

Source
  • Insufficient Cooling
  • Cutting Conditions
  • Wrong Drill
Solution

Check cooling lubricant. In the case of
internal coolant supply, increase coolant
pressure. In the case of external coolant
supply, adjusting positioning of coolant jet.
Cool from both sides.

Reduce cutting speed; increase feed.

Check cutting-edge diameter.

Hole Not Cylindrical

Source
  • Clamping Chuck
  • Workpiece Movement
  • Wrong Drill
  • Cutting Conditions
Solution

Check clamping accuracy and torque
transmission. Use hydraulic clamping chuck or high-precision chucking system.

Stabilize workpiece chucking and check
stability of machine tool.

Check drill type and drilling depth. Use
longer drills.

Reduce feed at entry.

Drill Breakage

Source
  • Clamping Chuck
  • Workpiece Movement
  • Wrong Drill
  • Insufficient Cooling
  • Cutting Conditions
Solution

Check clamping accuracy and torque transmission.

Use hydraulic clamping chuck or high-precision chucking system.

Stabilize workpiece chucking and check stability of machine tool.

Check drill type, drilling depth, cooling system, and workpiece material.

Check cooling lubricant. In the case of internal coolant supply, increase coolant pressure. In the case of external
coolant supply, adjust positioning of coolant jet. Cool from both sides.

Check cutting values, and possibly reduce feed.

Splintering on the Cutting Corners

Source
  • Clamping Chuck
  • Workpiece Movement
  • Wrong Drill
  • Insufficient Cooling
  • Cutting Conditions
Solution

Check torque transmission. Use hydraulic clamping chuck or high-precision chucking system.

Stabilize workpiece chucking and check stability of machine tool.

Check drill type, drilling depth, cooling system, and workpiece material. Possibly, use longer drill.

Check cooling lubricant. In the case of internal coolant supply, increase coolant pressure. In the case of external coolant supply, adjust positioning of coolant jet. Cool from both sides.

Check cutting values and possibly reduce feed.