Общий каталог ZCC-CT 2019 - страница 1108

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Trouble shooting – solid carbide drills A

ErrorReasonCountermeasure
– Bad drill regrinding– Improve regrinding
– Insufficient amount of coolant or coolant method– Change coolant supply – Increase amount of coolant
– Insufficient clamping – Large radial run out of spindle– Use precision clamping – Calibrate spindle
Bad surface quality– Feed rate too high– Reduce feed rate
– High wear of cutting edge – High welding– Regrind drill – Use a coated drill
– Bad chip removal– Chose a suitable drill (with an accordingly flute, helical angle etc.) – Adjust cutting speed (reduce feed rate, etc.)
Bad cylindricity– No symmetrical point angle – Large radial run out (drilling) – Centre insert is off centre – Large cutting edge wear – Feed rate too low– Regrind drill – Check regrind – Increase feed rate
Breakage of drill– Insufficient clamping of tool and/or workpiece– Improve stability of tool and clamping of workpiece
– Clearance angle too small– Use a drill with bigger clearance angle or regrind
– Feed rate too high– Reduce feed rate
– Excessive wear– Regrind drill
– Chip jamming– Chose a suitable drill (considering flute geometry, helical angle, etc.) – Adjust cutting speed – Reduce feed rate
– Drilling in uneven surfaces– Increase rigidity of drill and clamping of machine and workpiece – Use drill with sharp centre insert – Pre-drill a centre hole – Create a straight surface (e.g. with solid carbide milling cutter) – Use a guide bush or bush plate
Chipping on the drill– Hard surface or blow holes– Check material and chose suitable grade – Change cutting conditions (cutting speed, feed rate or machining method)
– Feed rate too high– Reduce feed rate
– Insufficient coolant– Improve/increase coolant supply
Chipping on the cutting edge– Poor clamping – Large radial run out– Use a more precise clamping device – Adjust the spindle
– Cutting speed and feed rate too high– Reduce cutting speed and feed rate
– Clearance angle too large– Use a drill with smaller clearance angle or regrind

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