Общий каталог Tungaloy 2020 - 2021 - страница 1662

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Troubleshooting for solid carbide drills

ProblemCauseCountermeasure
Inappropriate cutting speed•Increase the cutting speed by 10 % within standard conditions if abnormal wear is around center.
Relief surface lInappropriate cutting fl uid•Lower the cutting speed by 10 % within standard conditions if abnormal wear is on the periphery. •Check the fi lter.
ar•Use the cutting fl uid superior in lubricity. (Increase the dilution rate)
weInappropriate cutting speed•Lower the cutting speed by 10 %.
malRegrinding timing, insuffi cient reground amount•Shorten the regrinding timing.
orInsuffi cient rigidity of the machine and workpiece•Change the clamp method to the one with rigidity.
bniInsuffi cient drill rigidity•Use smallest possible overhang.
AMargin lInappropriate cutting fl uid•Check the fi lter. •Use the cutting fl uid superior in lubricity. (increase the dilution rate)
Intermittent cutting when entering•Avoid interruption at entry and exit. •Lower the feed by about 50 % during entering into and leaving from the workpiece.
iInsuffi cient rigidity of the drill•Reduce the drill overhang as much as possible. •Increase the feed at entry when the low speed feed is selected in standard cutting condition range. •Use a bushing or a center drill.
Chisel sectionIffi it iidit f th hi d ki•Ch th l thd t th ith iidit
nsui cen rgy o e macne an worpeceange e camp meo o e one w rgy.
(center of drillInappropriate entry into•Avoid interruption at entry into the workpiece.
cutting edge)the workpiece•Lower the feed by 10 % at entry.
reHigh workpiece hardness•Lower the feed by 10 %.
ctuInappropriate honing•Check if honing has been made to the center of cutting edge.
fraiInsuffi cient drill rigidity•Lower the cutting speed by 10 %.
nd•Increase the feed at entry when the low speed feed is selected in standard cutting condition range.
g aPeripheralInappropriate drill mounting accuracy•Check the run out accuracy after drill installation. (0.03 mm or less)
ppincutting edge iInsuffi cient machinery•Change the clamp method to the one with rigidity.
hiand workpiece rigidity•Lower the feed during entering into and leaving from the workpiece.
CInappropriate honing•Check if honing has been made to the cutting edge periphery.
Insuffi cient machine and workpiece rigidity•Change the clamp method to the one with rigidity.
iInsuffi cient drill rigidity•Use smallest possible overhang.
Mi•Use a bushing or center drill.
argnRegrinding timing and insuffi cient amount of reground stock•Shorten the regrinding timing.
Intermittent cutting when•Avoid interruption at entry and exit.
entering or exiting the cut•Lower the feed by about 50 % during entering into and leaving from the workpiece.
Tendency to cause chipping or develop abnormal wear•Check the failure mode condition before breakage and fi nd out the wear and chip countermeasures.
lChip packing in the drill fl utes•Review the cutting conditions.
Breakage•For internal coolant supply, raise the supply pressure of cutting fl uid. •Use peck feed for deep holes.
iInsuffi cient machine output•Review the cutting conditions.
•Use the machine with high power.
Insuffi cient rigidity of the machinery and workpiece•Change to the clamp method with rigidity
Inappropriate drill installation accuracy•Check the run out accuracy of drill mounting. (0.03 mm or less)
Insiuffi cient hole lChip packing in the fl utes.•Review the cutting conditions.
ii accuracy•Raise the cutting oil supply pressure. •Use peck-feed for deep holes.
Inappropriate edge sharpening accuracy•Check the edge shape accuracy.
Inappropriate cutting conditions•Increase the feed by 10 % within standard conditions.
Prolonged chipsInappropriate honing•Provide the appropriate honing.
Cutting edge with chipping or breakage•Lower the cutting speed by 10 %.