Diamond cutting blades
Diamond cutting blades are using in construction industry for cutting stone, concrete, brick etc. Diamond cutting blades can operate at speed up to 80 meters per secon. Thus, the maximum RPM for 180 mm blade is 8000, for 230 mm is 6000 rpm, and 355 mm is 3500 rpm.
The tool life of a diamond blade depends on the material of the binder, the size, the hardness and the quantity of diamonds.
A binder is a metal base, which includes crystals and aglomerates of diamonds. Production of diamond segments incudes processes of mixing metal and diamond powder, and then sintering them under high pressure. Diamond crystals are distributed throughout the volume of the segment or diamond layer, evenly located inside the ligament. How can the binder affects the tool life? The fact is that the diamond itself, though firm, is very fragile, and only works so long as it rests securely in the binder, for which the metal base serves it. At the same time, the diamond, worn out with time, should rise from this mass, in other words, it should be undressed. If the binder securely holds the diamond, but does not wear out at all, this leads to "glossing" - the diamonds do not open, the edge of the diamond disc is smooth and shiny. This happens if the bundle is very hard. This is not necessarily bad, for example, very hard binder will work well on materials with high abrasiveness. Such materials are sandstones, asphalt, fresh concrete - they are characterized by low strength, but the components of their components can be very hard and easily separated from the total mass - grains of quartz or corundum easily wear a soft bundle, quickly exposing diamond conglomerations and diamonds, not having time to wear, fly off. On the other hand, the soft ligament works well for hard materials, such as granite. The diamonds are opened in time and the performance of the disk remains at a high level.
The most important factor affecting not only the resource, but also the performance of the diamond blades, is the hardness and size of diamonds. At present, the most expensive and high-quality diamond tools are made using mixtures of natural and synthetic diamonds. The maximum quality of solid fractions, but they are very expensive and only partially used in the production of segments. The more in the composition of a mixture of soft fractions, the less the resource will show the diamond tool.
Large diamond crystals and their combinations - conglomerations, are used in the tool for fast and rough processing - cutting, grinding. Thin powders are used in grinding and polishing tools and pastes. The largest diamond crystals can be combined with a metal binder only in vacuum, and this technology allows to produce a diamond tool for cutting metal. Segments made by the usual technology for the processing of pure metal, without impurities of abrasive, are quickly glossing.