Общий каталог Tungaloy 2020 - 2021 - страница 1661

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GradeInsertExt. ToolholderInt. ToolholderThreadingGroovingMiniature toolMilling cutterEndmillDrilling toolTooling SystemUser's GuideIndex User’s Guide - Technical Reference A Drilling To o l s Cutting edge failure of solid carbide drills B ChippingFlaking(Shell-like spalling)(Small or minute fractureof cutting edge) C Breakage Irregular wear (Relatively large fracture) (Irregular flank wear) D Flank wear(Wear of cutting edge) Crater wear(Groove-like wear on rake face) Feed mark(Wear stripes in periphery) Corner wear E(Wear of peripheral corner) Fracture(Catastrophic breakageof drill body)Note: If these failures are not excessive, F the tool is in a normal condition. Change of chip shapes in drilling G ● Change of chip shapes relating to cutting conditions Photographs below show the change of chip shapes relating to change of the feed and the cutting speed. These chip shapes areall well controlled in a proper condition range.H When the speed and feed are low, the chip shows whitish color and the tail of the chip tends to lengthen gradually. In contrast, as the speed or the feed increases, the chip tends to increase in brightness and becomes a compact shape with a short tail. These changes in the shape depend on the cutting temperature. As the temperature increases, chips tend to be broken. I High Feed Low J K High Cutting speed Tail Low L M Tungaloy L073