Общий каталог ZCC-CT 2019 - страница 1108

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TurningMillingDrillingTechnicalInformationIndex Trouble shooting – drilling Technical information Trouble shooting – solid carbide drillsError Reason Countermeasure A – Bad drill regrinding – Improve regrinding – Insufficient amount of coolant or – Change coolant supply coolant method – Increase amount of coolant – Insufficient clamping – Use precision clamping – Large radial run out of spindle – Calibrate spindle Bad surface quality – Feed rate too high – Reduce feed rate – High wear of cutting edge – Regrind drill – High welding – Use a coated drill B – 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 – Regrind drill – Large radial run out (drilling) – Check regrind – Centre insert is off centre – Increase feed rate – Large cutting edge wear – Feed rate too low Breakage of drill – Insufficient clamping of tool and/or – Improve stability of tool and clamping of workpieceworkpiece C – 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 D – 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 E Chipping on the cutting edge – Poor clamping – Use a more precise clamping device – Large radial run out – 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 C167