What are the diamond wheels?

A diamond grinding cup wheel is a metal-bonded diamond tool that has diamond segments welded or cold-pressed onto a steel (or other metal, such as aluminum) wheel body that resembles a cup. To grind abrasive building materials such as concrete, granite, and marble, diamond grinding cup wheels are typically installed on concrete grinders.

Use

Diamond grinding cup wheels come in a variety of shapes and specifications to meet the needs of diverse applications. Large diamond segments can handle severe workloads, such as grinding concrete and stone, but small or sparse diamond segments are typically employed for quick removal of paints, wallpapers, glues, epoxy, and other surface coverings.

Diamond segments on diamond grinding cup wheels, like other metal-bonded diamond tools, can have variable bonding, diamond grits, diamond quality, and diamond concentrations to suit diverse applications. If the material to be ground is hard, the bond should be softer; if the material is soft, the bond should be harder.

In different-roughness grindings, diamond grinding cup wheels are employed. For coarse grinding, the bond should be softer, and the diamond quality should be better because diamonds become blunt more quickly in this scenario. The diamond grit should be larger, typically ranging from 35 to 50 grit. For this purpose, coarse grinding and coarse grit can improve work efficiency. The concentration of diamonds may be lower.

For fine grinding (also known as "polishing"), the bond should be harder and the diamond grade can be lower, as the diamonds will last longer and a hard bond will aid in process precision. Depending on the grinding needs, the diamond grit is typically between 80 and 120 grit. The concentration of diamonds should be higher. Following grinding, the material can be polished with resin-bonded diamond polishing pads of varying diamond grits.

Manufacturing methods

Diamond grinding cup wheels are typically manufactured using one of two methods: hot pressing or cold pressing.

The hot pressing method involves immediately sintering diamond segments in molds under high pressure in a specialized sintering press machine and then fixing or connecting the diamond segments to the grinding wheel's body via high-frequency welding, laser welding, or mechanical mosaic.

The cold pressing method involves pressing the diamond segments' working layer (which contains diamonds) and transitive layer (which does not contain diamonds) to their final forms directly on the grinding wheel's body and then allowing the segments to connect with the wheel's body via teeth, slots, or other means. The grinding wheels are then placed in sintering furnaces to sinter without the use of a press.