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Turning tools \ Technical introduction – turning - ISO turning

                     Determination of the correct design for lathing












        The following structural designs are distinguished for lathing:
        negative structural design                         Positive structural design
        the negative structural design has been developed for rough pre-machining and   The positive structural design has been developed for the final finishing of
        is characterised by excellent force absorption. with this structural design, high   components with high surface quality. Positive engagement with the workpiece
        infeeds are possible and heavy duty machining steps, such as interrupted cuts or  minimises cutting forces. This structural shape offers particular advantages in
        overtightening of scale films, can be implemented.  the case of unstable tool clamping or machining conditions, such as in the event
                                                           of a high projection length in internal machining.
        prerequisites for this design are stable workpiece clamping and a stable
        machine.




                       f                                                  f













        The following graph again illustrates the correlation:

                         Negative basic struc-     Negative basic struc-     Positive basic struc-
                            tural design              tural design             tural design
                            single-sided              double-sided




                               +                    Infeed (ap), cutting           –
                                                      forces, feed
                               >Rz                   Surface quality              <Rz



                     Selection of indexable insert design

        After correctly selecting the appropriate structural design, determining the insert form is an important component during machining. The following table illustrates
        the issue:

         Machining type                      R       S        C        W        T        D          V




                                                     90°      80°     80°      60°      55°        35°
         Rough machining with favourable cutting
         conditions
         Rough machining with unfavourable cutting
         conditions
         Medium machining with favourable cutting
         conditions
         Medium machining with unfavourable cutting
         conditions
         Smoothing
         Longitudinal turning and facing
         Profile turning
         Low vibrations
         Machining of hard materials
     Source: Hahn+Kolb Werkzeuge GmbH
     Technical data subject to change.               www.iconridge.com
     Availability subject to country specific rules and regulations.                            412

   0516_EN_2018_KERN[21847773]-m.indd  516                                                            12/17/2018  3:32:51 PM
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