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Drilling tools \ Processing and machining technology - SC/HSSE drilling

troubleshooting for solid carbide/HSSE drills

flank wear

flank wear is the preferred type of wear, if it is even.
problem
ƒ cutting speed too high
ƒ oil content in coolant too low
ƒ cooling inadequate
ƒ concentricity error
counter-measures
ƒ reduce cutting speed
ƒ increase oil content in coolant
ƒ increase coolant quantity
ƒ check concentricity
flank wear on chisel edge
problem
ƒ cutting speed too low
ƒ feed rate too high
ƒ concentricity error
counter-measure
ƒ reduce cutting speed
ƒ reduce feed rate
ƒ check concentricity
the hole quality decreases, since the self-centring capability is no longer guaranteed.

chipping
chipping occurs mainly when machining pre-drilled holes, when the tip angle of the pilot hole
is smaller.
problem
ƒ tip angles do not match each other
ƒ unstable conditions
ƒ concentricity error
ƒ cooling inadequate
counter-measure
ƒ check tip angles
ƒ check clamping
ƒ check concentricity
ƒ increase cooling
built-up edges

problem
ƒ cutting speed too high/too low
ƒ oil content in coolant too low
counter-measure
ƒ increase cutting speed so that the build-up edge moves to the middle
ƒ reduce cutting speed so that the built-up edge moves to the exterior or is avoided
ƒ increase oil content in coolant
drill breakage

problem
ƒ cutting speed too low
ƒ unstable conditions
ƒ concentricity error
ƒ feed rate too high
ƒ chips building up
counter-measure
ƒ increase cutting speed
ƒ check clamping
ƒ check concentricity
ƒ reduce feed rate
ƒ increase cooling

Source: Hahn+Kolb Werkzeuge GmbH
Technical data subject to change. www.iconridge.com
Availability subject to country specific rules and regulations. 84

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