Page 38 - Iscar Article 2_2017
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High-Technology





       Simplicity








        A new standard of indexable
        inserts: a carefully designed

        complex shape for effective
        cutting action


        Cemented carbide indexable inserts are                  Effective machining demands constant rake and
        an integral part of cutting tools today.                relief angles along the cutting edge, which in
        Cemented carbide inserts were introduced                turn necessitate complicated contours of the top
        in the early '60s and have substantially                of the insert (and also bottom for double-sided
        changed tool designs, putting tools with                inserts) and its periphery. A land that strengthens
        brazed carbide tips on the back burner.                 the cutting edge and a minor edge for better
        Mechanical clamping of the indexable                    milling by ramping further increases the
        inserts provided significant advantages                 design's complexity.
        in productivity, efficient use of carbide               The insert must ensure precise control of the flow
        and tool maintenance.                                   of chips produced by the cutting action, and so the
                                                                chip breaker on the rake face adjoining the cutting
        Advances in technology and metallurgy                   edge must be specifically shaped.
        have facilitated the development of indexable
        inserts that are far more advanced than their           This is particularly important for turning,
        predecessors, and complicated shapes                    especially if a machined material produces
        which have replaced the simple forms that               long chips; here, the chip breaker controls
        characterized inserts in the past.                      the direction of the chip flow so that the chip
                                                                overturns and breaks into smaller segments.

        The shape of an insert is a key factor for cutting
        geometry of a tool as a whole. For example, when        Finding the optimal insert shape for efficient
        milling, geometry variation by means of changing        cutting and chip control is not a simple task,
        the position of the insert in the tool is very limited,   and tool manufacturers have leveraged new
        and the results are far from optimal.                   technologies to develop successful solutions.
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