Tungsten Carbide Tool Wear During Woodcutting(1)

The general category of wood can be divided into three types, natural state wood, cured wood and wood-based composite materials. Within each category and between different types, the mechanical, physical, compositional and structural of wood are varied and which means each wood type displays its own unique wear characteristics. In terms of reasons caused of blunting by the tool piece and machine conditions,  cutting speed and the loading as two of the important factors needed to be addressed. They make impact in factors like the machine vibrations, the type of chip formed, frictional forces and the surface finish of the wood. Depending on the cutting and wood conditions, some of the wear mechanisms may become rate controlling. For example, it has been shown that the chemical attack by the wood acids accelerate the degradation process, whereby the cobalt binder phase is preferentially removed from the hardmetal matrix thus subjecting the exposed carbide grains to increased mechanical wear.


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