New developments in superabrasive grinding technology
Release time:
Apr 17,2024
Abrasives made of diamond or CBN abrasives are called superabrasives. Because of its excellent grinding performance, it is now widely used in all aspects of grinding technology, and has become the basis for the technological progress of ultra-precision grinding, high-efficiency grinding, difficult-to-machine materials grinding, high-precision forming grinding, grinding automation and unmanned.
Diamond and CBN abrasives due to their complementary in the processing of material adaptation, so that they constitute the grinding tool can be processed range greatly expanded, covering a variety of high hardness, high brittleness, high toughness materials, including almost all the materials being processed.
Diamond abrasives are the best abrasives for grinding hard and brittle materials such as cemented carbide, optical glass, ceramics and wordstone, but it is not suitable for grinding steel materials and ultra-high-speed grinding because it is easy to carbonize at 700℃~800℃.CBN abrasives have led to a revolution in grinding technology, which can withstand high temperatures of 1,300℃~1,400℃, and has a high degree of chemical inertia for iron elements, good thermal conductivity, high excision rate and high grinding efficiency when grinding steel. High excision rate when grinding steel, large grinding ratio, long grinding tool life, is the best grinding hardened steel, high-speed steel, high-strength steel, stainless steel and heat-resistant alloys, such as high hardness toughness of the metal of the best abrasives. In addition, CBN abrasives are also suitable for ultra-high-speed grinding, metal substrate CBN abrasives line speed of more than 250m/s will not be broken.
CBN abrasives are widely used mainly in recent years, a variety of high-efficiency and high-performance CNC grinding machine, as well as advances in abrasive manufacturing technology, the development of excellent performance of single-layer plating and high-temperature brazing and other new abrasives, prompting the development of grinding technology, especially high-efficiency grinding point of the new process is more favored by the people.
Point grinding (Quickpoint Grinding) was first introduced by the German Junker Company. It is the use of brazed CBN thin grinding wheel (width of only a few mm) and ultra-high grinding wheel speed (120m/s ~ 180m/s, high up to 200m/s ~ 250m/s) to achieve. The grinding wheel axis is processed so that the grinding wheel axis and the workpiece axis form a certain angle of inclination in the horizontal direction in order to make the theoretical line contact between the grinding wheel and the workpiece into a point contact. This can greatly reduce the area of grinding contact area, and very high grinding speed can make the abrasive chips thin, abrasive grain load reduction, but also can make the heat can not be transmitted to the workpiece and the grinding wheel, on the sister according to the service are almost all taken away by the abrasive chips, improve the workpiece machining accuracy and surface quality. The use shows that the grinding ratio of point grinding is large, the grinding wheel life is long, the dressing frequency is low, and the material removal rate is high, at the same time, because it adopts the same two-coordinate linkage as the NC lathe to realize the surface grinding of complex rotary body parts, one time the installation can process all the shapes of the outer circle, taper, curved surface, threads, shoulders and grooves, and it is more flexible than the plunge-cut grinding, and at the same time, the cooling effect is excellent and the grinding temperature is low, and it can even The process has been used in the production line of Santana car of Shanghai Volkswagen Automobile Co., Ltd. in China, and has achieved significant economic benefits.
