Общий каталог Tungaloy 2020 - 2021 - страница 1669

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Breaking of drill At entry into workpieceDuring drillingAt exit from workpieceDuringretracting GradeInsertExt. ToolholderInt. ToolholderThreadingGroovingMiniature toolMilling cutterEndmillDrilling toolTooling SystemUser's GuideIndex User’s Guide - Technical Reference A Drilling To o l s Nomenclature for gun drill B Secondary clearance angle Oil clearance Primary clearance angle 8˚~15˚Outer cutting angle C Inner cutting angle Outer corner Apex point Chamfer Margin Tip Shank V-flute Driver D Oiling hole Wear surface (Guide pad) Shank oil hole E Tr o u b l e s h o o t i n g in gun drilling Problem Cause Trigger CountermeasureClamping the workpiece is unstable.Clamp the workpiece firmly.F The guide bush is apart from the workpiece surface atthe entry.Contact the guide bush closely with the workpiece. Machine The machine's rapid feed is used.Whipping effect occurs.The shape of the guide bush is not suitable.Use cutting feed.Place a whip guide at the appropriate position.Use the guide bush in the shape suitable for the workpiece.G The drill is not set properly. Set the drill with an appropriate torque, hydraulicpressure, etc. Drill Regrinding is in poor quality. Make sure no damage is left on the drill and that the Hcutting edge geometry is not changed. Cutting condition The feed (f) is too high. Use low feed.WorkpieceThe workpiece surface is slanted.Use low feed.Clamping the workpiece is unstable.Clamp the workpiece firmly.I Machine The shape of the guide bush is not suitable.The feed speed (Vf) varies.The number of revolutions varies (decreases).Modify the shape of the guide bush.See “Chip packing” for the details.Use mechanical feed.Increase the machine power or adjust the cutting conditions.J Drill Abnormal damage occurs. See “Short tool life” for the details. Cutting condition The feed (f) is not suitable. Use an appropriate feed.WorkpieceInterrupted or cross drilling is required.Change the tool to a standard gundrill.OthersChip packing occurs.See “Chip packing” for the details.K The tip is too long. Make the tip length short. Drill The selection of the guide pads is not suitable. Use 2 guide pads instead of 3.The clearance of the coolant hole is too large.Reduce the clearance of the coolant hole.L Cutting condition The feed (f) is too high. Use low feed. Workpiece The workpiece surface is slanted. Use low feed.MachineClamping the workpiece is unstable.Clamp the workpiece firmly.M Cutting condition Burnishing torque (cutting power) is increased Reduce cutting speed (Vc). due to reduced hole diameter. Tungaloy L081