【正文】 the mold of traditional processing, heat treatment hardening of the workpiece required EDM, highspeed machining replace the traditional method of cutting the processing, manufacturing process possible to omit die in EDM, simplifying the processing technology and investment costs . Highspeed milling in the precincts of CNC machine tools, or for processing centre, also in the installation of highspeed spindle on the general machine tools. The latter not only has the processing capacity of general machine tools, but also for highspeed milling, a decrease of investment in equipment, machine tools increased flexibility. Cutting highspeed processing can improve the efficiency, quality improvement, streamline processes, investment and machine tool investment and maintenance costs rise, but prehensive, can significantly increase economic efficiency. 2 Highspeed milling Highspeed milling the main technical highspeed cutting technology is cutting the development direction of one of it with CNC technology, microelectronic technology, new materials and new technology, such as technology development to a higher level. Highspeed machine tools and highspeed tool to achieve highspeed cutting is the prerequisite and basic conditions, in highspeed machining in the performance of highspeed machine tool material of choice and there are strict requirements. Highspeed milling machine in order to achieve highspeed machining General use of highly flexible highspeed CNC machine tools, machining centers, and some use a dedicated highspeed milling, drilling. At the same time a highspeed machine tool spindle system and highspeed feeding system, high stiffness of the main characteristics of highprecision targeting and highprecision interpolation functions, especially highprecision arc interpolation function. Highspeed machining systems of the machine a higher demand, mainly in the following areas: General use of highly flexible highspeed CNC machine tools, machining centers, and some use a dedicated highspeed milling, drilling. At the same time a highspeed machine tool spindle system and highspeed feeding system, high stiffness of the main characteristics of highprecision targeting and highprecision interpolation functions, especially highprecision arc interpolation function. Highspeed machining systems of the machine a higher demand, mainly in the following areas: Highspeed milling machine must have a highspeed spindle, the spindle speed is generally 10000 ~ 100000 m / min, power greater than 15 kW. But also with rapid speed or in designated spots faststopping performance. The main axial space not more than 0 .0 0 0 2 m m. Often using highspeed spindlehydrostatic bearings, air pressurebearing, mixed ceramic bearings, magic bearing structure of the form. Spindle cooling general use within the water or air cooled. Highspeed processing machinedriven system should be able to provide 40 ~ 60 m / min of the feed rate, with good acceleration characteristics, can provide m/s2 to 10 m/s2 acceleration and deceleration. In order to obtain good processing quality, highspeed cutting machines must have a high enough stiffness. Machine bed material used gray iron, can also add a highdamping base of concrete, to prevent cutting tool chatter affect the quality of processing. A highspeed data transfer rate, can automatically increase slowdown. Processing technology to improve the processing and cutting tool life. At present highspeed machine tool manufacturers, usually in the general machine tools on low speed, the feed of the rough and then proceed to heat treatment, the last in the highspeed machine on the halffinished and finished, in improving the accuracy and efficiency at the same time, as far as possible to reduce processing Cost. Highspeed machining tool Highspeed machining tool is the most active one of the important factors, it has a direct impact on the efficiency of processing, manufacturing costs and product processing and accuracy. Tool in highspeed processing to bear high temperature, high pressure, friction, shock and vibration, such as loading, its hardness and wearresistance, strength and toughness, heat resistance, technology and economic performance of the basic highspeed processing performance is the key One of the factors. Highspeed cutting tool technology development speed, the more applications such as diamond (PCD), cubic boron nitride (CBN), ceramic knives, carbide coating, (C) titanium nitride Carbide TIC (N) And so on. CBN has high hardness, abrasion resistance and the extremely good thermal conductivity, and iron group elements between the great inertia, in 1300 ℃ would not have happened significant role in the chemical, also has a good stability. The experiments show that with CBN cutting tool HRC35 ~ 67 hardness of hardened steel can achieve very high speed. Ceramics have good wear resistance and thermal chemical stability, its hardness, toughness below the CBN, can be used for processing hardness of HRC 5 0 parts. Carbide Tool good wear resistance, but the hardness than the lowCBN and ceramics. Coating technology used knives, cutting tools can improve hardness and cutting the rate, for cutting HRC40 ~ 50 in hardness between the workpiece. Can be used to heatresistant alloys, titanium alloys, hightemperature alloy, cast iron, Chungang, aluminum and posite materials of highspeed cutting Cut, the most widely used. Precision machining nonferrous metals or nonmetallic materials, or the choice of polycrystalline diamond Gangcoated tool. Highspeed processing technology Highspeed cutting technology for highspeed machining is the key. Cutting Methods misconduct, will increase wear tool to less than highspeed processing purposes. Only highspeed machine tool and not a go