High speed grinding and polishing machine not only can greatly improve the grinding efficiency, but also can effectively improve the machining quality. It is one of the most important development directions of the grinding technology.
        High speed grinding and polishing machine with small grinding force, high machining accuracy As the high speed grinding and polishing machine grinding, the grinding chip thickness becomes thinner, and the grinding efficiency of the grinding force will decrease with the increase of Vs (Vs 210m/s), which is the 50% of 90m/s, and the deformation of the process system is reduced. In addition, the vibration frequency of ultra high speed grinding is much higher than the natural frequency of the process system. The common result is to improve the grinding accuracy.
         High speed lapping and polishing machine and high efficiency deep grindingHigh speed grinding is relative to the ordinary

grinding, where the speed of the grinding wheel linear velocity Vs>45m/s can be referred to as high-speed grinding. As early as 1950s, Vs has been raised to 60m/s, the 60 time and increased to 90m/s, but after ten years due to the speed of the grinding wheel rotation and the problem of the workpiece burn, the speed of the grinding wheel is not much improved. Until the late 90's, with the application of Vs (CBN) wheel, the grinding mechanism was further studied, and it was found that the grinding force in the range of the grinding force increased with the increase of the speed of the grinding wheel at the Vs=100m/s. This is said that in the past generation of heat damage in the grinding area, the further increase of the amount of grinding, not only will not aggravate the heat damage, but the heat damage no longer occur, so that the development of ultra high speed grinding and high efficiency deep grinding has laid a theoretical foundation.
         Although the high speed grinding and polishing machine is not specified, it is usually referred to as a super high speed grinding wheel with the speed of Vs>160m/s. Generally speaking, high speed grinding and polishing machine has the following advantages:
High grinding efficiency, low grinding wheel wear
The grinding efficiency is improved greatly also to the higher grinding speed, the unit time to participate in cutting wear particle number more, grinding removing debris increased, and workpiece feed rate should be 1.21 times and the linear speed of the grinding wheel is proportional to, so ultra high speed grinding. With this, the grinding force of a single abrasive grain is reduced, which reduces the wear of the grinding wheel. Many experiments show that when the grinding force is constant, the speed of the grinding wheel is increased from 95m/s to 210m/s, and the grinding efficiency is increased by 3 times and the life of the CBN grinding wheel is 1 times longer than that of Vs.
        High speed lapping and polishing machine parts surface quality is goodExperiments show that when the speed of the grinding wheel is from 34m/s to 210m/s, the surface roughness of the grinding wheel is reduced from Ra2.1 to Ra1.0 by other conditions. Because of the high speed grinding process, a large number of grinding heat will be taken away, the proportion of the incoming workpiece is very small, not only is not easy to surface burn, but also the depth of the surface residual stress layer will be smaller.
        In addition, the high speed grinding and polishing machine can also achieve the ductile domain grinding of hard brittle materials, and also have good grinding effect, so the industrial developed countries are competing to develop, especially in Germany, Japan, hairdressing show faster. According to reports, the German Aachen Industrial University has completed the experimental wheel line speed Vs=420m/s, is now being carried out in the experiment of 550m/s, Germany Schandt, Kapp, GruhringAutomation and other companies have launched a super high-speed grinding machine. Japan has been productive in practical grinding, and the ultra high speed grinding machine of Vs=210m/s, which is produced by TOYOTA and other companies, has been put into practice. American EdgetekMachine production of the use of a single layer of CBN grinding wheel is also famous for the ultra high-speed grinder. On the CIMT2002, the Hunan University, China, exhibited a high speed cam grinding machine CNC8322, its CBN grinding wheel line speed of up to 130m/s.
         Slow feed grinding is characterized by deep and low working feed rate, and the so-called high efficiency deep grinding (HighEfficiencyDeepGrinding), is the high removal rate of CBN grinding wheel grinding, resulting in a set of high grinding wheel speed (Vs=80~250m/s), fast working feed rate (0.5~10m/min) and large depth (0.1~30mm) in one of the high efficiency deep grinding technology. The grinding rate is very high, especially suitable for the cutting of the groove parts. Figure 3 shows the BLOHM company in the CIMT2003 PROFIMATMT series flat and forming CNC grinding machine, the overall layout of the rigid good column in the waist movement, working table for vertical movement, feed rate 0.03~25m/min, three linear motion are used AC servo machine, ball screw and rolling guide, grinding wheel spindle maximum power 60kW, the maximum speed of grinding wheel 170m/s. This kind of grinder can be used for high efficiency deep grinding.
        Some key techniques of lapping and polishing machine
The process system of the high speed lapping and polishing machine is the key technology of the grinding, the grinding machine, the grinding wheel, the grinding process and the grinding fluid. TOYOTA, Japan, a few years ago, the introduction of ultra high speed CNC cylindrical grinder GZ32P, its grinding wheel line speed of up to 210m/s. When it uses for vitrified CBN grinding wheel on Figure 2 shows the deceleration components (material hrc68 hardened steels), workpiece speed 1100r / min, machining allowance] =0.1225mm 150m / s linear speed of the grinding wheel grinding. The obtained results are: the processing time is 78S, the roundness of the workpiece is 1.1 acid, the surface roughness is Rz1.8 acid. Compared with the use of ordinary grinding wheel cutting, machining time and workpiece roundness errors are reduced by more than half.
        Mechanism and process of polishing machine