Backscattered Electron Imaging Mechanics for Precision Electrode Slitting Tooling Selection
Backscattered electron imaging quantifies sub-micron carbide grain integrity and cobalt binder depletion to select slitting tools that prevent edge burrs.
Diamond Grinding Damage
Meaning
Surface and subsurface microstructural alteration occurs when abrasive wheels mechanically finish hard metal components under high pressure. Toolmakers must minimize diamond grinding damage because it introduces tensile residual stresses and micro-cracks into the carbide substrate. This degradation occurs during the final shaping of the tool.
The defect reduces the strength of the finished product.
Surface Stress
Thermal energy generated during grinding shifts the residual stress from compressive to tensile. Excessive diamond grinding damage leaves the surface prone to spontaneous failure under low load conditions. Proper coolant application is necessary to prevent this thermal shift.
Crack Formation
Mechanical impact from the hard diamond grit can shatter the brittle carbide phase. Uncontrolled diamond grinding damage generates a network of sub-surface cracks that cannot be detected by visual inspection. These cracks grow under cyclic loading during machining.
This sub-surface damage is the root cause of many premature tool failures.
Tool Performance
Reduced resistance to mechanical impact is the direct consequence of finishing defects. Components with extensive diamond grinding damage fail prematurely when subjected to interrupted cuts or high vibration. This weakness increases the variability of tool life and complicates production scheduling for end users.
Using a finer grit size and lower feed rate during the final passes reduces the depth of the affected zone. This practice preserves the integrity of the material and ensures the component meets its rated durability.