Каталог Iscar обработка канавок 2022 - страница 171

Recommended Criteria for Replacement of the Cutting Edge

the required workpiece tolerances. Wear is a function of machining time. The cutting edge should normally be replaced after 15 minutes of machining time. Insert Wear-Tool Life Wear on the Clearance Face

Wear land on groove turn inserts generally occurs at the corner of the clearance face VBN, on the side near the corner VB, on the frontal cutting edge VBF and at the end KB of the cutting side VG. The effective life of the cutting edge ends when any of the wear land values-VB, VB, VBF or VG-exceed the recommended maximum values shown. The largest wear land is normally measured at the corner of the clearance face VBN. It has the most influence on the dimensions and tolerances of the final workpiece. The wear land shape on GRIP inserts differs slightly from that of ISO inserts. Although the frontal cutting surface Plastic Deformation of GRIP inserts absorbs more heat land wear, the wear Plastic deformation occurs when the hardness of a land VBF is generally negligible in turning operations cutting edge is decreased due to heat and pressure.

when compared to VB and VBN. Wear may be found “ ”

The so-called hot hardness of the cutting tool material only occasionally at the end of the cutting side VG. limits the feed and the cutting speed. Plastic deformation will affect the dimensions and

tolerances of the finished product. It generally occurs when a small corner radius is used with high cutting speeds and high feeds. Using the proper insert geometry and the correct speed and feed ranges should eliminate the problem.

VG

VB

F

VB

N VB

Maximum recommended wear land

values relative to insert widths