What Is A Grinding Wheel?
The pores (hollow spaces between adjacent abrasive grains and the bond) serve to provide clearance for coolant penetration and metal chips removed in the grinding process.
When the wheel is rotated at grinding speed and applied to the workpiece, the abrasive grains cut the material that is being ground, removing the material in small chips.
The increase in grinding forces causes either the abrasive to fracture, exposing new cutting edges, or fractures the bond bridges holding the abrasive grains. In the latter case fresh abrasive grains are exposed to cut the workpiece.
In normal vitrified grinding applications, the wheel has to be dressed. By varying the properties of the abrasive, the type of bond, the make-up of the wheel, it is possible to produce grinding wheels with a vast range of different grinding characteristics.
Why Use A Cup Grinding Wheel?
These are available in two forms; shape 06, where the two sides of a straight cup wheel are at a right angle to the base. With shape 11 tapered cup wheels the sides taper outwards, providing extra strength and therefore accepting higher lateral loads. Both types are primarily used in tool & cutter grinding.
Why Use A Vitrium SGA / SGB Ceramic Grinding Wheel?
Norton SG is a patented ceramic form of aluminium oxide that is harder and sharper than conventional abrasive grains. The ceramic grain has a unique microcrystalline structure and when used in a grinding operation this microstructure becomes self-sharpening. This leads to a reduction in the need for wheel dressing and a considerably cooler cutting action.
SGB in particular is a blend of premium abrasives that include a low concentration of SG ceramic abrasive grain. SG has a unique microcrystalline structure allowing self-sharpening.