Tungsten Carbide Cutting Tools’ Natural Wood Cutting

When applying tungsten carbide cutting tools in natural wood cutting processes, a fast increase in power consumption and surface roughness is indicated.



Specially if the natural wood is wet Western Red Cedar, within 15 minutes, the tungsten carbide cutting tools blunt would occur. The tests of the reactivity of cobalt and tungsten carbide in solutions of Western Red Cedar extractives at temperatures of 20°C and 60°C showed that the cobalt binder is preferentially attacked while the carbide grains remained relatively unaffected since they retained their sharp edges. The corrosive nature was found to be temperature dependent where the metals lost 35% more weight at 60°C than at 20°C. This indicates that the increase in temperature accelerated the dissolution process and may control the rate of chelation. Both worn and unworn tool inserts were investigated and the unworn carbide inserts showed very little dissolution of the carbides, while the worn inserts showed a higher amount of carbide dissolution. This indicates that lattice damage due to wear facilitates chemical access resulting in higher wear rates. They further proposed that carbide grains are held in position by the cobalt and when this cobalt is removed then the carbide grains either fall out or are removed.

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