With its excellent grinding performance, super-hard abrasives have been widely used in all aspects of grinding technology, and have become ultra-precision grinding, high-efficiency grinding, grinding of difficult-to-machine materials, high-precision forming grinding, and grinding The basis of technological progress such as automation and unmanned.
Diamond and CBN abrasives, due to their complementarity in the adaptation of processing materials, greatly expand the processing range of the abrasive tools made of them, covering almost all processed materials including various high-hardness, high-brittle, high-strength and toughness materials. .
Diamond abrasive tool is the best abrasive tool for grinding hard and brittle materials such as cemented carbide, optical glass, ceramics and adjective stone, but because it is easy to carbonize at 700℃~800℃, it is not suitable for grinding steel materials and super High speed grinding. The emergence of CBN abrasives has led to a revolution in grinding technology. It can withstand high temperatures of 1300℃~1400℃, is chemically inert to iron group elements, has good thermal conductivity, high removal rate when grinding steel, and high grinding ratio. It has a long life and is the best abrasive for grinding hardened steel, high-speed steel, high-strength steel, stainless steel and heat-resistant alloys with high hardness and toughness. In addition, CBN abrasive tools are also suitable for ultra-high-speed grinding, and the metal matrix CBN abrasive tools will not break even if the linear velocity exceeds 250m/s.
The widespread use of CBN abrasive tools is mainly due to the advent of various high-efficiency and high-performance CNC grinding machines in recent years, as well as the advancement of abrasive tool manufacturing technology, and the development of new abrasive tools such as single-layer electroplating and high-temperature brazing with excellent performance, which promotes the grinding The development of technology, especially the new high-efficiency point grinding process is more popular.
Quickpoint Grinding was first introduced by a German company. It is realized by brazing CBN thin grinding wheels (with a width of only a few mm) and ultra-high grinding wheel linear speeds (120m/s~180m/s, high up to 200m/s~250m/s). During processing, the axis of the grinding wheel and the axis of the workpiece form a certain inclination angle in the horizontal direction, so that the theoretical line contact between the grinding wheel and the workpiece becomes a point contact. This can greatly reduce the area of the grinding contact area, and the extremely high grinding speed can not only make the grinding debris thinner and reduce the load of the abrasive particles, but also make it too late to transfer the heat to the workpiece and the grinding wheel, and almost all of it is taken away by the grinding debris. , Improve the processing accuracy and surface quality of the workpiece. The use shows that point grinding has a large grinding ratio, long life of the grinding wheel, low dressing frequency and high material removal rate. At the same time, it uses the same two-coordinate linkage as the NC lathe to realize the surface grinding of complex rotating parts, one installation It can process all shapes such as external circles, cones, curved surfaces, threads, shoulders and grooves. It is more flexible than plunge grinding, and at the same time it has excellent cooling effect and low grinding temperature. It can even truly achieve dry grinding.