Каталог Iscar вращающийся инструмент 2017 - страница 595

Troubleshooting

Problem Cause

• Poor clamping of the chuck
• Workpiece movement
• Wrong drill
• Insufficient coolant
• Unsuitable cutting conditions
• Worn out drill center point (chisel)

Solution

• Check the clamping. Use hydraulic clamping chuck, maxin power chuck or a shrink system.
• Increase workpiece chucking force.
• Check drill type and drilling depth, cooling system and workpiece material.
• Check cooling lubricant. Increase coolant pressure. In the case of external coolant supply, improve jet direction and add cooling jets.
• Reduce feed.
• Regrind cutting edge.

• Insufficient chip evacuation

Drill breakage

• Poor clamping of the chuck
• Workpiece movement
• Wrong drill
• Insufficient coolant
• Unsuitable cutting conditions
• Worn out or broken

Chipping on the cutting corners cutting corner Problem Cause

• Unsuitable cutting conditions

• Use pecking cycle.
• Check the clamping and adaptation. Use hydraulic clamping chuck, maxin power chuck or a shrink system.
• Increase workpiece chucking force.
• Check drill type and drilling depth, cooling system and workpiece material. Possibly use longer drill.
• Check cooling lubricant. Increase coolant pressure. In the case of external coolant supply, improve jet direction and add cooling jets.
• Check cutting parameters, and possibly reduce feed.
• Replace drill or regrind cutting edge.

Solution

• Reduce feed by 30-50% during exit.

• Worn out drill

Burrs on exit

• Unsuitable cutting

Ra conditions

• Large runout
• Chip jamming

Rough surface finish

• Large runout
• Poor stability
• Rough application

Deviation of hole position

• Replace drill.
• Adjust feed to improve chip flow.
• Make sure that the drill’s runout is within 0.02 mm (radial & axial).
• Reduce cutting speed.
• Increase coolant pressure.
• Apply pecking procedure.
• Make sure that the drill runout is within 0.02 mm (radial & axial).
• Check and improve drill and workpiece clamping rigidity.
• When drilling hard materials or sloped surfaces, reduce feed by 30-50% during entrance.
• Use a short pilot drill with 140° point angle.