Tungsten Carbide Cutting Tools Edge Defects (A)

After grinding of tungsten carbide cutting tools, will be on the cutting edge defects, these defects can cause instability in the cutting process, the impact of the machined surface quality and reduce 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.

1. Burr
Tungsten carbide cutting tools on the cutting edge, there are many prominent thorn-like or burrs, called flash. Burr is small, the naked eye can not be observed, edges seem weak, but in reality is quite stubborn, using only grinding general, it is difficult to completely wear off. Cutting process, the burrs on the machined surface have swipe action, affecting the quality of the machined surface; moreover Burr easily collapse out or curl, curled edge will cause the cutting edge or chipping, thereby affecting the cutting tools.

2. Micro-gap
Tungsten carbide cutting tools after ordinary wheel or diamond grinding wheel, there are different degrees of micro-gap, these microscopic gaps are naked eye can not be observed, the microscopic gap width is generally 0.01 ~ 0.05mm, the width of the larger of 0.1mm or more. During cutting tool edge micro-gap easily extended, as the extension of the tool gap, increased wear, chipping and other phenomena will follow, accelerating tool wear and damage. If after grinding tool edge passivation, the tool becomes smooth edge, eliminating the exclusion of teeth, etc. jagged and crack defects.




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