Общий каталог ZCC-CT 2019 - страница 927

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TurningMillingDrillingTechnicalInformationIndex Technical information Trouble shooting – milling A Trouble shooting – indexable milling Fig. Type of wear Effects Reason Countermeasure Flank wear – Bad surface quality and – Grade not wear-resistant enough – Grade with higher wear-resistance dimensional stability – Cutting speed too high – Reduce cutting speed 1+2 – Increase of cutting force – Clearance angle too small – Increase clearance angle – Feed rate too low – Reduce feed rate Crater wear – Bad surface quality and chip – Grade not wear-resistant enough – Grade with higher wear-resistance control – Cutting speed too high – Reduce cutting speed 3 – Feed rate too low – Reduce feed rate Chipping – Unstable tool life – Grade too hard – Grade with higher toughness – Sudden breakage of cutting – Feed rate too high – Reduce feed rate B 4 edge – Cutting edge not stable enough – Change honing of cutting edge– Stability of the holder or tension insuf-– Use a more stable tool holder ficient Breakage – Increase of cutting force – Grade too hard – Grade with higher toughness – Bad surface quality and – Feed rate too high – Reduce feed rate dimensional stability – Cutting edge not stable enough – Change honing of cutting edge 5 – Stability of the holder or tension insuf- – Use a more stable tool holder ficient Plastic – Bad dimensional stability – Grade not wear-resistant enough – Grade with higher toughness deformation – Damage to cutting edge – Cutting speed too high – Reduce cutting speed 6 – Cutting depth and/or feed rate too high – Reduce cutting depth and feed rate C – Temperature on the cutting edge too – Grade with higher heat-resistancehigh Welding – Increase of cutting force – Cutting speed too low – Increase cutting speed – Bad surface quality – Cutting edge not sharp enough – Increase rake angle 7 – Grade not suitable – Use a more suitable grade Thermal cracks – Breakage due to thermal – Temperature fluctuation when machining – Dry machining interaction, often caused – Grade too hard – Grade with higher toughness 8 when cutting is interrupted (milling) Notch wear – Burr formation – Damage through chips (jagged edges) – Grade with higher wear-resistance – Increase of cutting force – Feed rate and cutting speed too high – Increase rake angle to get a sharper 9 cutting edge D – Reduce cutting speed Flaking (coating) – Often appears when ma- – Cutting edge adhesion and chipping – Increase rake angle to get a sharper chining hardened materials – Bad chip removal cutting edge 10 or caused by vibration – Chip breaker with bigger chip space 3 6 E 9 89 74 5 1 2 10 B 464