The body material has to withstand the grinding forces, the centrifugal forces from wheel rotation, and the resulting internal stresses. In the grinding process, the body material should dampen vibrations and transfer heat. Furthermore, the body material needs to be shaped easily into the wanted geometry and should have low weight. These requirements translate into physical material properties:
• Young’s modulus,
• Compressive strength,
• Coefficient of expansion,
• Isotropy,
• Heat conductivity.
For galvanic bonding systems, there are additional requirements for the body [FERL92, p. 66], like being electrically conductive and having a good corrosion resistance. For superabrasive grinding wheels, a couple of different body materials are used. Table 5.2 gives an overview on damping, heat conductivity, and mechanical strength. The expansion coefficient correlates with density and Young’s modulus, so metal bodies have higher expansion than carbon fiber-reinforced polymers.
|
Table 5.2 Body materials after [WINT88, p. 9, UAMA09, KRAF08]
++ very high, very good + high, good o medium, satisfactory — low, poor |