Общий каталог ZCC-CT 2019 - страница 178

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TurningMillingDrillingTechnicalInformationIndex Trouble shooting – PCBN & PCD General turning Trouble shooting – PCBN & PCD Countermeasure A Type of wear Geometry Cutting condition Flank wear – Sharper cutting edge for reduced cutting force – Reduce cutting speed – Smaller negative chamfer – Increase feed rate to reduce operation time – Use positive inserts Notch wear – Bigger radius – Use "method of altering feed rate" Crater wear/breakage due to crater – Sharper cutting edge for reduced cutting force – Reduce cutting speed wear – Increase feed rate to minimise operation time and to increase distance between cutting edge and crater B Chipping due to rough condition – Bigger negative chamfer angle and/or honed – Increase feed rate to reduce number of hits or vibration chamfer Flaking – Sharper cutting edge to reduce cutting force – Increase feed rate to reduce operation time – Smaller negative chamfer – Use positive inserts Thermal crack/breakage – Sharper cutting edge for reduced cutting force – Reduce cutting speed, feed rate and depth of cut – Smaller negative chamfer – Dry machining – Use positive inserts Chipping – Bigger negative chamfer – Increase cutting speed to reduce cutting force C For investigation please send us the used inserts. If breakage is the problem please use inserts only 80–90 % of expected tool life because broken inserts almost have no information. D E A 173