Choose the right grinding wheel

In order to choose the most suitable grinding wheel for the current job, many factors must be considered.
① Material to be ground. This determines the type of abrasive required for the grinding wheel. For example, for grinding steel or alloy steel, alumina or zirconia alumina should be used for grinding. For grinding cast iron, non-ferrous metals and non-metal materials, silicon carbide abrasives are selected.
Hard, fragile materials usually require a finer grain and softer grinding wheel. Because hard materials resist the cutting of abrasive grains and make them easily dull. Therefore, the fine particle size and softer hardness can make the abrasive grains quickly fall off when they become dull, and immediately reveal sharp and sharp new abrasive grains. In contrast, for soft, ductile and easy-to-cut materials, a coarse-grained and harder grinding wheel should be selected.

②The amount of removal is also a key consideration.
Coarse-grained abrasives can quickly remove the volume of the workpiece because they have greater penetration and greater cutting force. But for materials that are difficult to cut, the grinding wheel has a finer grain size, and the cutting efficiency will be better because there are more sharp points that can be cut.
The grinding wheel with ceramic bond has high cutting efficiency. However, if the removal is expected to be small or the surface roughness requirements are high, resin, rubber or shellac adhesive grinding wheels should be selected.

③ Running speed of grinding wheel.
Generally, the use speed of vitrified bond grinding wheel will be lower than 6,500ft/min. (33m/s) Too high speed, the ceramic bond will break.
The use speed of organic bond grinding wheel is about 6500-9500ft/min per minute. (33~48m/s) If you want to work at a higher speed, you need a specially formulated high-speed grinding wheel for high-speed grinding.
In any case, do not exceed the maximum safe line speed marked on the grinding wheel.

④ The grinding contact area between the grinding wheel and the workpiece.
If the contact area is larger, a coarser and softer grinding wheel will be used. This can ensure that under large-area grinding with large resistance load, normal and relatively low-temperature grinding is still maintained. If the grinding area is small, a fine-grained and high-hardness grinding wheel will be used to withstand a larger unit pressure.

⑤The severity of the grinding work is also the focus of consideration.
Refers to the pressure between the grinding wheel and the workpiece. Some abrasives will be designed to grind steel or alloy steel to withstand more stringent grinding conditions.

⑥The power (horsepower) of the grinder also needs to be considered.
Generally, a harder grinding wheel requires a high-power grinding machine. If the power is smaller than the diameter of the grinding wheel, use a softer grinding wheel. If the power is greater than the diameter of the grinding wheel, choose a harder grinding wheel.