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A grinding wheel is a wheel composed of an abrasive compound and used for various grinding (abrasive cutting) and abrasive machining operations. Such wheels are used in grinding machines.
A grinding wheel is a wheel composed of an abrasive compound and used for various grinding (abrasive cutting) and abrasive machining operations. Such wheels are used in grinding machines.
The wheels are generally made from a composite material consisting of coarse-particle aggregate pressed and bonded together by a cementing matrix (called the bond in grinding wheel terminology) to form a solid, circular shape. Various profiles and cross sections are available depending on the intended usage for the wheel. They may also be made from a solid steel or aluminium disc with particles bonded to the surface. Today most grinding wheels are artificial composites made with artificial aggregates, but the history of grinding wheels began with natural composite stones, such as those used for millstones.
The manufacture of these wheels is a precise and tightly controlled process, due not only to the inherent safety risks of a spinning disc, but also the composition and uniformity required to prevent that disc from exploding due to the high stresses produced on rotation.
Grinding wheels are consumables, although the life span can vary widely depending on the use case, from less than a day to many years. As the wheel cuts, it periodically releases individual grains of abrasive, typically because they grow dull and the increased drag pulls them out of the bond. Fresh grains are exposed in this wear process, which begin the next cycle. The rate of wear in this process is usually very predictable for a given application, and is necessary for good performance.
1. Abrasive Material:
| Category |
Features |
Usage |
|
Brown Corundum |
High hardness and toughness |
It can be used for grinding medium and high tensile strength metal such as ordinary carbon, steel, alloy steels, malleable cast iron, hard bronze etc. |
|
White |
Its hardness is higher than that of the A. Grains are easily broken. The edges of the grains are sharp with excellent cutting performance small quantity is produced. |
It can be used for grinding harder material and metals sensitive to heat such as chilled steel, high carbon steel ordinary high speed steel, alloy steel .it is specially suitable for the grinding and forming grinding instruments, cutting tools, gears threads, thin wall parts, etc |
|
Pink Corundum |
The hardness is close to WA, but the hardness is higher. The grains are sharp. It is much durable, |
Used for the grinding of the chilled steel, cutting tools and work-pieces of alloy steel as well as the precision grinding of the measuring tools and parts of the instruments. |
|
Mixture of A and WA |
It possesses the advantage of both A and WA |
It is suitable for the grinding of nodular, cast iron crank shaft, cam shafts and other work-pieces. |
|
Green Silicon |
With high hardness and brittle. Its grain edges are sharp， and it is of excellent capacity of the heat –transmission. |
It is suitable for the grinding of the cutting tools and work-pieces of hard alloy, and non-ferrous metal and non-metal materials |
|
Black Silicon |
With high hardness and brittle. Its grain edges are sharp and it is of certain capacity of the heat –transmission. |
It is suitable for the grinding of non-ferrous and non–metal materials. |
2. Choice the Grit. Sizes
| Girt Sizes |
Usage |
|
4,5,6,8,10,12,14,16,20,22,24,30 |
Rough Grinding and Cutting |
|
36,40,46,54 |
Common Semi-precision Grinding |
|
60,70,80,90,100 |
Common Fine Grinding |
|
120,150,180,220,240,W63,W50,W40,W28.W20 |
Polishing and Threading |
|
W14,W10,W7,W5,W3.5,W2.5W1.5,W1.0,W0.5 |
Mirror –surface grinding and Finer Polishing |
