Общий каталог Tungaloy 2020 - 2021 - страница 1667

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Drilling Tools B

Troubleshooting for indexable drills

ProblemCauseCountermeasure
Central cutting edgeRelief surfaceInappropriate cutting conditions¡Increase the cutting speed by 10 % within standard conditions. ¡Lower the feed by 10 %.
Peripheral cutting edgeRelief surfaceInappropriate cutting conditions¡Increase the cutting speed by 10 % within standard conditions. ¡When the feed is extremely low or high, set up it within standard conditions.
Varieties and supply of cutting fl uid¡Confi rm that the cutting fl uid fl ow is higher than 7 liter/min. ¡The concentration of cutting fl uid must be higher than 5 %. ¡Use the cutting fl uid superior in lubricity. ¡Change to internal cutting fl uid supply from external one.
ar¡Change to the machine with higher torque.
mal weRelief surfaceVibration in drilling¡Change to the clamp method with rigidity. ¡Change the drill setting method.
norUnsuitable for selection ofgrade¡Change the grade to high wear resistant.
Common AbLooseness of screws¡Tighten the screw.
CraterCutting heat is too high¡Change to internal cutting fl uid supply from external one. ¡Increase the supply rate of the cutting fl uid. (Higher than 10 liter/min.) ¡Lower the feed by 20 % within standard conditions. ¡Lower the cutting speed by 20 % within standard conditions.
Excessive chip welding¡Lower the feed by 20 % within standard conditions. ¡Lower the cuttingspeed by20 % within standard conditions.
¡Increase the cutting speed by 20% and lower the feed by 20% within standard conditions.
ChipbreakerChip packing¡Raise the fl uidpressure(for higher than 1.5 MPa).
Misalignment for workpiece rotation¡Set the misalignment to 0 ~ 0.2 mm.
Large offset¡Check the manual and use the tool in the allowable offset range.
Centrall¡Flatten the entry surface in pre-machining.
cuttingThe rotationNo fl atness of machined surface¡Set the feed for lower than 0.05 mm/rev in rough surface area.
edgecenter of drillHigh feed¡Lower the feed by20 ~ 50 % within standard conditions.
Using a chipping corner¡Confi rm the corner when exchanging inserts.
Using inserts in excess of tool-life¡Exchange the corner or the insert before the nose wear reaches 0.3 mm.
Peripherall¡Flatten the entry surface in pre-machining.
cutting ePeripheralNo fl atness of machined surface¡Set the feed for lower than 0.05 mm/rev at rough surface area.
edge cturcorner areaThe existence of interrupted area¡Set the feed for lower than 0.05 mm/rev in interrupted area.
d fraUsing a chipped corner¡Confirm the corner when exchanging inserts.
g anThe unused¡Increase the cutting speed by 20 % and lower the feed by 20 % within standard conditions.
ppincorner areaHigh hardness of workpiece¡Raise the fl uidpressure(for higher than 1.5 MPa).
Chiand cuttingChip packing¡Lower the feed by20 % within standard conditions.
edgeMachineryimpact¡Change to continuous feed in case ofpick feeding.
Using inserts in excess of tool-life¡Exchange the corner or the insert before the nose wear reaches 0.3 mm.
Contact¡Change to the machine with higher rigidity.
CommonboundaryVibration in drilling¡Change to the clamp method with rigidity. ¡Change the drill setting method.
High hardness of workpiece¡Set the feed for lower than 0.05 mm/rev.
FlakingThermal impact¡Change to internal cutting fl uid supply from external one. ¡Lower the feed by 20 % within standard conditions.
CUnsuitable for selection ofgrade¡Change the grade to toughness.
ommonLooseness of screws¡Tighten the screw.