Общий каталог ZCC-CT 2019 - страница 927

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Trouble shooting – milling

A Trouble shooting – indexable milling

Fig.Type of wearEffectsReasonCountermeasure
1+2Flank wear– Bad surface quality and dimensional stability – Increase of cutting force– Grade not wear-resistant enough – Cutting speed too high – Clearance angle too small – Feed rate too low– Grade with higher wear-resistance – Reduce cutting speed – Increase clearance angle – Reduce feed rate
3Crater wear– Bad surface quality and chip control– Grade not wear-resistant enough – Cutting speed too high – Feed rate too low– Grade with higher wear-resistance – Reduce cutting speed – Reduce feed rate
4Chipping– Unstable tool life – Sudden breakage of cutting edge– Grade too hard – Feed rate too high – Cutting edge not stable enough – Stability of the holder or tension insuf- ficient– Grade with higher toughness – Reduce feed rate – Change honing of cutting edge – Use a more stable tool holder
5Breakage– Increase of cutting force – Bad surface quality and dimensional stability– Grade too hard – Feed rate too high – Cutting edge not stable enough – Stability of the holder or tension insuf- ficient– Grade with higher toughness – Reduce feed rate – Change honing of cutting edge – Use a more stable tool holder
6Plastic deformation– Bad dimensional stability – Damage to cutting edge– Grade not wear-resistant enough – Cutting speed too high – Cutting depth and/or feed rate too high – Temperature on the cutting edge too high– Grade with higher toughness – Reduce cutting speed – Reduce cutting depth and feed rate – Grade with higher heat-resistance
7Welding– Increase of cutting force – Bad surface quality– Cutting speed too low – Cutting edge not sharp enough – Grade not suitable– Increase cutting speed – Increase rake angle – Use a more suitable grade
8Thermal cracks– Breakage due to thermal interaction, often caused when cutting is interrupted (milling)– Temperature fluctuation when machining – Grade too hard– Dry machining – Grade with higher toughness
9Notch wear– Burr formation – Increase of cutting force– Damage through chips (jagged edges) – Feed rate and cutting speed too high– Grade with higher wear-resistance – Increase rake angle to get a sharper cutting edge – Reduce cutting speed
10Flaking (coating)– Often appears when ma- chining hardened materials or caused by vibration– Cutting edge adhesion and chipping – Bad chip removal– Increase rake angle to get a sharper cutting edge – Chip breaker with bigger chip space

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