Coated inserts for rough milling
AssigneeSandvik Aktiebolag
InventorsAnders Nordgren, Ingemar Hessman, Marian Mikus
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Abstract
Coated milling insert has a WC-Co cemented carbide with a low content of cubic carbides and a highly W-alloyed binder phase and a coating including an inner layer of TiCxNy with columnar grains followed by a layer of κ-Al2O3 and a top layer of TiN. The coated milling insert is particularly useful for milling of grey cast iron with or without cast skin under wet conditions at low and moderate cutting speeds and milling of nodular cast iron and compacted graphite iron with or without cast skin under wet conditions at moderate cutting speeds.
Claims5
A cutting tool insert for milling of grey cast iron with or without cast skin under wet conditions at low and moderate cutting speeds and milling of nodular cast iron and compacted graphite iron under wet conditions at moderate cutting speeds, comprising:
- a cemented carbide body comprising WC, 7.3-7.9 wt. % Co, 1.0-1.8 wt. % cubic carbides of Ta and Nb, and a highly W-alloyed binder phase with a CW-ratio of 0.86-0.94;
- a coating comprising a first, innermost layer of TiCxNyOz with x+y+z=1, y<x and z<0.2 having an equiaxed grain structure with a size <0.5 μm and a total thickness of 0.1-1.5 μm;
- a layer of TiCxNy with x+y=1, x<0.3 and y<0.3 with a thickness of 1-4 μm having a columnar grain structure with an average diameter of <5 μm;
- a layer of a smooth, fine-grained, 0.5-2 μm κ-Al2O3 with a thickness of 1-2.5 μm;
- and
- an outer layer of TiN with a thickness of 0.5-1.0 μm.
Dependencies are inferred from the claim text.