Общий каталог Tungaloy 2020 - 2021 - страница 1671

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Drilling Tools B

Troubleshooting i n gun drilling

ProblemCauseTriggerCountermeasure
The type of coolant is not appropriate.r Use water-insoluble coolant.
Foreign material is in the coolant.lholde Thoroughly filtrate the coolant (Use a filter with the filtration accuracyin 10µm or less).
MachineThe clearance between the guide bush and the drill is not appropriate.xt. Too Replace the guide bush (The clearance should be between +0.003 and +0.008).
Whipping effect occurs.E Place a whip guide at the appropriate position.
The concentricity of the guide bush and the spindle is too large.lholder Decrease the concentricity of the guide bush and the spindle.
fe earThe coolant temperature is too high.Too Increase the capacity of the tank.
ool li al wThe selection of the guide pads is not suitable.Int. Use 2 guide pads instead of 3.
Short t AbnormDrillRegrinding is in poor quality.ading Make sure no damage is left on the drill and that the cutting edge geometry is not changed.
The drill's overall length is excessive.hre Reduce the drill’s overall length.
Excessive wear occurs and the chip shape changes.T Regrind the gundrill (ease the tool life criteria).
The cutting speed (Vc) is too high.ing Reduce the cutting speed.
Cutting conditionThe feed (f) is too high.oov Reduce the feed.
The coolant pressure is not high enough.Gr Increase the coolant pressure.
WorkpieceThe material quality varies.ool Reduce the cutting speed (Vc).
The shape of the guide bush is not suitable.ature t Modify the tip of the guide bush to match the shape of the workpiece surface at the entry.
MachineThe number of revolutions varies (decreases).Mini Increase the machine power or adjust the cuttingconditions.
kingThe chip box is too small for smooth chip evacuation.utter Enlarge the chip box.
pacCutting conditionThe feed (f) is not suitable.ng c Use an appropriate feed.
trol ChipThe coolant pressure is not high enough.Milli Increase the coolant pressure.
conInterrupted or cross drilling is required.Change the tool to a standard gundrill.
ChipWorkpieceThe operation is for stacked plates.mill Change the cutting edge shape so that the cores become small.
The material quality varies.End Increase the feed.
ntThe cutting edge is fractured or chipped.See “Breakage” for the details.
hip lemeDrillWear on the outer corner is excessive.tool Regrind the gundrill (ease the tool life criteria).
C tangCutting conditionThe feed (f) is too low.lling Increase the feed.
enWorkpieceDrilling a center hole is required.Dri Make the center hole as small as the drill diameter and increase the coolantpressure.

Workpiece diameter and increase the coolant pressure. K

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