Ⅰ. Why grinding wheel is able to grind?
Three Factors of Grinding Wheels
These three factors enable grinding wheels to grind, polish and cut.
|Abrasives||Each abrasive becomes edge and able to grind workpiece.
Abrasives are fallen off when these are worn down and lost sharpness,
then these expose new cutting edges constantly (Self sharpening).
Bond combines and holds the abrasives together.
The quality of wheels is controlled by the type and/or compounded amount of bond.
|Pore||Pore is a space of between abrasives. Shavings fall in the pores and are discharged
while the rotations of wheel. Grinding wheel does not work without pores.
Features of Grinding Wheels
- Abrasive grain is harder than workpiece.
- Abrasives are fallen off when these are worn down and lost sharpness, then these expose new cutting edges constantly.
- Grinding wheels have countless edges and depth of cut is low but these provide fast grinding speed, high performance and fine finish.
- Most of heats generated by operations are absorbed into workpiece.
Mechanism of Grinding Wheels
*Abrasive grains expose new cutting edges constantly; this is a unique feature of grinding wheels called “self sharpening“.
Troubleshooting of Grinding Problem
Have you ever experienced troubles as described below?
|Glazing||Abrasives on wheel face are lost sharpness. Wheel has shiny appearance and feels slick.|
|Clogging||Shavings or worn grains lodged in wheel pores.|
|Shedding||Abrasive grains drop before wearing down.|
If any of such troubles appears, please check the following conditions.
- Operating speed (Be sure the operating speed is no higher than the speed marked on the wheel.)
- Dressing (expose new cutting edges = abrasives) method etc.
*If there is no improvement after changing grinding conditions, please reselect grinding wheels.