Общий каталог Tungaloy 2020 - 2021 - страница 1671

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Short tool lifeChip control Abnormal wearChip packingChipentanglement GradeInsertExt. ToolholderInt. ToolholderThreadingGroovingMiniature toolMilling cutterEndmillDrilling toolTooling SystemUser's GuideIndex User’s Guide - Technical Reference A Drilling To o l s Tr o u b l e s h o o t i n g in gun drilling B Problem Cause Trigger Countermeasure The type of coolant is not appropriate. Use water-insoluble coolant. Machine Foreign material is in the coolant.The clearance between the guide bushand the drill is not appropriate.Thoroughly filtrate the coolant (Use a filterwith the filtration accuracy in 10µm or less).Replace the guide bush (The clearanceshould be between +0.003 and +0.008).CWhipping effect occurs.Place a whip guide at the appropriateposition. The concentricity of the guide bush and Decrease the concentricity of the guidethe spindle is too large.bush and the spindle.The coolant temperature is too high.Increase the capacity of the tank.D The selection of the guide pads is notsuitable. Use 2 guide pads instead of 3. Make sure no damage is left on the drill Drill Regrinding is in poor quality.The drill's overall length is excessive.and that the cutting edge geometry is notchanged.Reduce the drill’s overall length.E Excessive wear occurs and the chip shape Regrind the gundrill (ease the tool life changes. criteria). The cutting speed (Vc) is too high. Reduce the cutting speed.Cutting conditionThe feed (f) is too high.Reduce the feed.F The coolant pressure is not high enough. Increase the coolant pressure. Workpiece The material quality varies. Reduce the cutting speed (Vc). The shape of the guide bush is notsuitable. Modify the tip of the guide bush to matchthe shape of the workpiece surface at theentry.G Machine The number of revolutions varies Increase the machine power or adjust the (decreases). cutting conditions. The chip box is too small for smooth chipevacuation.Enlarge the chip box.The feed (f) is not suitable.Use an appropriate feed.Cutting conditionH The coolant pressure is not high enough. Increase the coolant pressure. Interrupted or cross drilling is required. Change the tool to a standard gundrill. Workpiece The operation is for stacked plates.The material quality varies.Change the cutting edge shape so that thecores become small.Increase the feed.I The cutting edge is fractured or chipped. See “Breakage” for the details. Drill Wear on the outer corner is excessive. Regrind the gundrill (ease the tool lifecriteria).Cutting conditionThe feed (f) is too low.Increase the feed.J Workpiece Drilling a center hole is required. Make the center hole as small as the drilldiameter and increase the coolant pressure. K L M Tungaloy L083