Tungsten Carbide Cutting Tool Edge Defects (B)

the life of tungsten carbide cutting tools. Cutting edge surface usually produces the following defects: flash, micro-gap edge region, the residual stress and the blade surface area cobalt leaching.

3. Residual Stress
tungsten carbide cutting tools due to its texture, structure and manufacturing process and other factors, in the manufacturing and sharpening process, the remaining energy will be unevenly accumulate on the surface or inside of the tool, the performance of the residual stress and stress concentration. Residual stress and stress concentration exists, the tool in the cutting process is more sensitive to stress and thermal stress, prone to fatigue cracking and chipping, leading to decreased tool life or damage.

4. Cobalt leaching
In the process of grinding of tungsten carbide cutting tools, grinding fluid not only can reduce the grinding temperature, but also serve to improve the quality of grinding and grinding efficiency effects, and therefore widely used in the processing. China Tianjin University graduate student Zhang good strong analyze the mechanism of cemented tungsten carbide cobalt leaching, and the use of oleic acid, triethanolamine and borax as a cutting fluid additives. Experimental results show that this method can suppress the leaching of cobalt tungsten carbide elements, thereby increasing tool life and reduce the cutting fluid on the human body. Grinding tungsten carbide grinding fluid when it is possible to make use of tungsten carbide cobalt leaching. Cobalt cemented tungsten carbide as binder, it will greatly reduce the leaching tungsten carbide cutting resistance to mechanical impact and service life.


 

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