Tungsten Carbide Cutting Tools Wear Process

Tungsten carbide tools wear process is divided into early wear, normal wear and severe wear of three phases.

1. Wear the early stages
Tungsten carbide cutting tools and the workpiece during the fourth year, as the new tools sharpening surface roughness and micro-cracks, defects such as oxidation or decarbonization layer, so that the actual contact area is small, the contact point bonding serious, so the tools wear faster. As the cutting proceeds, the tools surface micro peak peak gradually rubbed off, the surface roughness values decrease, the actual contact area increases, increased number of contact points, so tungsten carbide tools wear rate decreased. Coated tungsten carbide cutting tools at low speed, the wear more evenly. When the speed increases, the wear and tear is beginning to show a parabolic band.

2. Normal wear stage
After the initial worn, rough surfaces and polished tungsten carbide cutting tools gradually phase into the normal wear and tear. This stage is relatively slow uniform wear, with the growth of the amount of wear and the cutting time is approximately proportional to the increase. This stage is the stage of effective working tool. When the tools wear stage into the normal wear and tear, wear, Deputy Regional flank wear was uniform phenomenon. Especially coated tungsten carbide cutting tools, wear range presents a uniform wear strip. Compared with uncoated tungsten carbide cutting tools, wear it more slowly into the normal wear stage.

3. Severe wear stage
When the amount of wear tungsten carbide cutting force reaches a certain value will increase sharply, cutting temperature rises rapidly, the flank wear values will increase significantly decreased mechanical efficiency, precision loss, abnormal vibration and noise, the final result cutting tools fall, resulting in the loss of tungsten carbide cutting ability.

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