User:TOOLIE/Grinding Wheel Wear

Grinding wheel wear is important measured factor of grinding in the manufacturing process of engineered parts and tools. The quality, characteristics, and rate of grinding wheel wear can be affected by contributions of the characteristics of the material of the workpiece, the temperature increase of the workpiece, and the rate of wear of the grinding wheel itself. Moderate wear rate allows for more consistent material size. Maintaining stable grinding forces is preferred rather than high wheel wear rate which can decrease the effectiveness of material removal from the workpiece.

Grinding Wheel Types
Grinding wheels can be made with a variety of materials depending on the desired abrasive quality required during use. Abrasive material, natural of synthetic, used in grinding includeSome common types of grinding wheel geometry
 * 1) Straight
 * 2) Cylinder
 * 3) Straight Cup
 * 4) A variety of material types and

Attritious Wear
Attritious wear is a result of grinding wheel grains making contact with the workpiece. Diffusion between the grains and work piece, chemical degradation of the grinding wheel, decomposition of grains, microscopic fractures in the grinding wheel, plastic deformation of the grinding wheel, and melting of the grinding wheel all contribute to attritious wear. Attritious wear can be reduced by selecting a grinding wheel material that is chemically inert with the workpiece, this is due to the reduction of reactions and the amound of adhesion that occurs between the grinding wheel and workpiece.

Grain Fracture
Grinding wheels also wear as their grains fracture due to their brittle nature. As the grains fracture, new cutting edges are created preventing the grinding wheel from becoming dull. The rate of desirable grain fracture is dependent on the rate of attritious wear, this is due to the fact that attritious wear dulls the grains. Dull grains increase the likely hood of surface damage occurring on the work piece.

Bond Fracture
Bond fracture wear is dependent on the hardness of the grinding wheel, harder grinding wheels experience less bond fractures. Bond fracture wear occurs when grinding grains are removed from the grinding wheel, this action also exposes new cutting edges. If the bond between the grains and wheel is too strong the grinding wheel will become dull and reduce it's effectiveness, but if the bonds are too the grinding wheel will wear very quickly as the grains are removed in large quantities. Soft grinding wheels are useful when working with hard workpieces or when trying to minimize residual stresses and thermal damages in the workpiece. Harder grinding wheels are used to remove material very quickly from the workpiece or when working with softer workpieces.

Dressing
A worn grinding wheel can be dressed to restore its grinding properties. Dressing a grinding wheel causes new grains to be produced on a glazed or loaded grinding wheel. A glazed grinding wheel is the result of high attritious wear causing the grains to become dull. A loaded grinding wheel is a result of chips clogging the grains on the grinding wheel due to the grinding of soft materials, improper grinding wheel selection processing paramaters. In addition to sharpening a grinding wheel dressing can also be used to true a grinding wheel that is out of round or to shape the profile of a grinding wheel to produce specific features on the workpiece.