2016-08-23

What Kind of Grinding Wheel Materials and Bonds Should Be Selected?

To select an appropriate grinding wheel effectively cutting and grinding materials, you have to be well familiar with the physical properties of cutting and grinding wheels, those materials to be ground, as well as wheel bonds, as the wheels made of different materials are used for cutting distinct objects.

1.Choose the wheels according to the material to be ground

The materials to be operated can decide the kind of abrasive you will need in the wheel. For example, aluminum oxide or zirconia alumina should be used for grinding steels and steel alloys. For grinding cast iron, non-ferrous metals and non-metallic materials, select a silicon carbide abrasive.

2. Choose the right cutting and grinding wheels materials

A China cut-off wheel with a fine grit size and a soft grade are used for cutting hard, brittle materials, this is because hard materials resist the penetration of abrasive grains and cause them to dull quickly. Commonly, the combination of finer grit and softer grade lets abrasive grains break away as they become dull, exposing fresh, sharp cutting points. On the other hand, China cutting wheels with the coarse grit and hard grade should be chosen for materials that are soft, ductile and easily penetrated.

The amount of stock to be removed is also a consideration. Coarser grits give rapid stock removal since they are capable of greater penetration and heavier cuts. However, if the work material is hard to penetrate, a slightly finer grit wheel will cut faster since there are more cutting points to do the work.

3.Choose the proper wheel bonds

Resin, rubber or shellac bonds should be chosen if a smaller amount of stock is to be removed, or if the finish requirements are higher.

However, the vitrified bond may break at higher speeds. Organic bond wheels are generally the choice between 6,500 and 9,500 surface feet per minute. Working at higher speeds usually requires specially designed wheels for high speed grinding.