Каталог Dormer Pramet фрезерование 2021 - 2022 - страница 780

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9 TYPES OF WEAR ON MILLING INSERTS BRITTLE CRACKS AT THE CUTTING EDGE ↓ (H) grain has a great influence. (MT)CVD + PVD coating recommended. PVD f ↓ Feed has infuence on intensity, but less than the cutting speed. v ↑↓ It is about vibrations. ap ↓ It has no influence. ↑ Increase the rake angle to reduce cutting forces. - No coolant (it is possible to use air to remove chips from cutting area). Use better working condition (ae/DC). FAILURE OF CUTTING EDGE ↓ (H) grain has a great influence. (MT)CVD + PVD coating recommended. PVD f ↑↓ Good swarf control is very important. v ↑↓ It is about swarf control and vibration. ap ↑↓ Reduces the force load (important for machining with long overhangs). ↓ Use less positive cutting geometry. It has no influence. Use better working conditions, reduce feed rate until insert is in cut. CREATION OF RACK CRACKS ↓ (H) grain has a great influence. (MT)CVD ++ PVD coating recommended. PVD f ↓ Feed has infuence on intensity, but less than the cutting speed. v ↓ Lower speed means lower temperature. ap It has no influence. ↑ Use another (more positive) cutting geometry. --- No coolant (it is possible to use air to remove chips from cutting area). Use better working condition (ae/DC). 779