Tool wear observations
- November 23, 2011
Tool wear observations according to Moshe Goldberg, manager of marketing, training and engineering support for Iscar Ltd., Tefen, Israel.
High stresses, High friction, High temp (1000°C) = tool damage
Fragments of the workpiece get welded to the tool surface at high temperatures; eventually, they break off, tearing small parts of the tool with them.
Hard particles, microscopic variations on the bottom surface of the chips
rub against the tool surface
At high temperatures, atoms from tool diffuse across to the chip;
the rate of diffusion increases exponentially with temperature;
this reduces the fracture strength of the crystals.