Use of shims made from carbide

A key factor in the smooth operation of peeling tools is the use of a shim made from carbide adapted to the outside profile of the peeling insert. On the one hand, it provides the cutting insert with the required support in the insert seat and on the other, it protects the seating surface in the insert seat against deformation and indentations. As a result, the carbide shim prevents eroding of the tool holder through chip stroke, which occurs often due to the narrow spatial conditions in the peeling head during peeling processes. The secondary cutting edge must always be aligned precisely with the workpiece axis during the peeling process. A cutting edge positioned under the turning centre causes vibrations. A cutting edge positioned above the bar axis causes high cutting pressure, hardening of the bar surface and plastic deformation of the cutting insert, which ultimately has a negative impact on the tool life of the insert. Using shims with different thicknesses, the correct position of the cutting edge can be set on the bar centre. No signs of wear on the support chamfer, splintering on the cutting edge and extreme wear on the chip breaker indicate a cutting edge positioned under the workpiece axis. By contrast, extreme wear on the support chamfer but low wear on the chip breaker indicate a cutting edge positioned above the workpiece axis.

The use of shims made from carbide prevents erosion, deformation and indentations in the tool holder.

Shims made from carbide adapted to the outside profile of the indexable insert.