Общий каталог ZCC-CT 2019 - страница 1109

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A Trouble shooting – solid carbide drills

ErrorReasonCountermeasure
Excessive wear– Overdue regrinding– Regrind in time
– Drill tip not in centre position– Adjust drill with centre of spindle
– Cutting speed too high– Reduce cutting speed
– Cutting angle not suitable– Chose right cutting angle
– Material not suitable– Chose suitable material
– Insufficient cooling– Use suitable cooling
Wear and chipping on point relief– Feed rate too high– Reduce feed rate
– Cutting angle not suitable– Chose right cutting angle
– Material not suitable– Chose suitable material
– Clearance angle too small– Regrind drill
Breakage on margin– Guide bush too large– Change guide bush
Built up edge on margin– High wear and heat– Regrind drill
– Insufficient cooling– Change cooling method
– Wrong coolant– Change coolant
– Workpiece material is too soft– Use drill with smaller clearance angle
High vibrations– Clearance angle too large– Regrind drill
– Drill stability too low– Improve stability
Swarf clogs the drill– Long chips – Chip removal not fluent– Optimise cutting data – Change drill or adjust machine
One-side wear– Drill tip not centred– Adjust drill with centre of spindle
– Poor clamping– Improve drill clamping – Check concentricity

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