How to choose diamond grinding cup wheel?

Diamond grinding cup wheel looks like a cup, people also call it diamond cup grinding wheel, diamond grinding disc or diamond cup wheel. It is used for grinding concrete, terrazzo, granite, marble and other natural stone.

Diamond grinding cup wheel is made of diamond segments and iron cup base, the diamond segment could be welded on iron base or sintered with iron based completely. They are usually installed on handheld angle grinder and floor grinder machine.

There are different types and diameter of diamond grinding cup wheels for various applications.  For very coarse, coating, paints, glue and similar surface. Coarse segmented or PCD diamond grinding cup wheel is suitable for it. They are fast grinding, long lifespan cost saving for you.  The coarse diamond segment could be Arrow shape, Double row, etc.

For grinding concrete, diamond grinding cup wheel has a range of different hardness on bonds, they are very hard, hard, medium hard, soft and very soft, various diamond grits, diamond quality and different diamond concentrations to suit different application. For example, if the concrete surface is quite hard, the bond should be softer, if the concrete floor is comparatively soft, the bond should be harder. For coarse grinding, large grit/coarse grain can improve grinding efficiency easily.

For fine grinding of soft concrete, the bond should be used hard, therefore the diamond quantity must be much more pieces than coarse, it will last long time grinding and polishing. The diamond grit between 80 to 220 grits.  Some people use low quality diamonds for fine grinding. People can choose double row diamond grinding cup wheel, it is the most popular.

After being ground, the construction material is often further polished with resin bonded diamond polishing pads from grits 100# to 3000#.

There are TWO method to produce diamond grinding cup wheels: silver welding(brazing) and sintering.

To make the silver welding brazed diamond cup grinding wheel, the diamond segments are produced first, then welded them on iron base, it can be also used bronze welding, laser welding. The sintering technique is to initial press the working layer (containing diamonds) and the transitive layer (not containing diamonds) of the diamond segments to their forms directly on the grinding wheel's body, and let the segments connect with the wheel's body via teeth, slots or other different manners. Then, place the grinding wheels into sintering furnaces to sinter without press.

The sintered diamond grinding cup wheel has a better sharpness and lower price, but a short lifespan. The silver welding/brazed diamond cup wheel is more expensive than sintered one, but much better quality and long lifespan. For concrete grinding, we always suggest clients use the silver welded concrete grinding wheel.  ChinShine diamond grinding cup wheel takes up many markets around the world.

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