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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.                           48

   0098_EN_2018_KERN[21841817]-o.indd  98                                                             12/17/2018  3:31:02 PM
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