【文章內(nèi)容簡介】 stable important measure. Some engine bed panies39。 research and development departments in design process, but also uses the modality analysis and the finite element structure putation and so on, optimized the structure, stably causes the engine bed strut part to be reliable.2. Engine bed main axleThe high speed engine bed main axle performance is the realization highspeed cutting processing important condition. The highspeed cutting engine bed main axle rotational speed scope is 10000~100000m/Min, the main axle power is bigger than 15kW. Is not bigger than through the main axle pressed air of or axial play between the cooling system control hilt and the main axle. Also requests the main axle to have the fast vertical speed, to assign the performance which the position is fast stops (namely to have extremely high angle addition and subtraction speed), therefore the high speed main axle often uses the liquid static pressure bearing type, the air static pressure bearing type, the thermopression nitriding silicon (Si3N4) the ceramic bearing magnetism aerosol bearing type isostructuralism form. Lubricates uses technology and so on oil gas lubrication, splash lubrication. The main axle cools uses the main axle interior water cooling generally or air cooled.3. The engine bed actuates the systemIn order to satisfy the mold high speed processing the need, high speed processes the engine bed the actuation system to be supposed to have the following characteristic:(1) high entering for speed.The research indicated that, regarding the minor diameter cutting tool, enhances the rotational speed and each tooth enters for the quantity is advantageous in reduces the cutting tool attrition. At present monly used entering for the speed range is 20~30m/Min, like uses leads greatly the ball bearing guide screw transmission, enters may reach 60m/ for the speedMin。 Uses the straight line electrical machinery then may enable to achieve 120m/ to the speedMin.(2) high acceleration.Has the good acceleration characteristic to the three dimensional plex curved surface silhouette high speed processing request actuation system, the request provides the driver which the high rapid advance or progress gives (to enter speed approximately 40m/ quicklyMin, the 3D outline processing speed is 10m/Min), can provide The engine bed manufacturer mostly uses the entire closed loop position servocontrol slightly to lead, the great size, the high grade ball bearing guide screw or leads greatly many guide screws. Along with the electrical machinery technology development, the advanced straight line electric motor already was published, and the success applied in the CNC engine bed. The advanced straight line direct motor drive enable the CNC engine bed no longer to have the mass inertia, in advance, question and so on lag and vibration, sped up the servo speed of response, increased the servocontrol precision and the engine bed processing precision.4. Numerical control systemThe advanced numerical control system is guaranteed the mold plex curved surface high speed processing quality and the efficiency key aspect, the mold highspeed cutting processing to the numerical control system basic request is: A. High speed numerical control return route (Digital control loop), including: 32 or above 64 bit parallel processors and hard disk。 Extremely short straight line electrical machinery sampling time. B. Speed and acceleration feedforward control (Feed forward control)。 Digital actuation system crawling control (Jerk control).C. Advanced inserts makes up the method (to insert based on the NURBS transect makes up), by obtains the good surface quality, the precise size and the high geometry precision. D. Pretreatment (Lookahead) function. The request has the large capacity cushion register, may read in advance and inspects many segments (for example the DMG engine bed to be possible to reach 500 segments, the Simens system may reach a 1000~2000 segment), in order to when is processed the superficial shape (curvature) changes may promptly adopt changes for measure and so on speed by avoids cutting and so on. E. The error pensatory function, including because the straight line electrical machinery, the main axle and so on gives off heat the hot error which causes to pensate, the quadrantal error pensates, the measurement system error pensates and so on the function. In addition, the mold highspeed cutting processing very is also high to the data transmission speed request. F. The traditional data connection, like the RS232 serial mouth transmission speed is , but many advanced processings centers have used the ether local area network (Ethernet) to carry on the data transmission, the speed may reach 200kb.5. Cooling lubricationThe high speed processing uses the belt coating the hard alloy tools, in high speed, the high temperature situation does not need the cutting pound, the cutting efficiency to be higher. This is because: The milling main axle high speed revolves, the cutting pound if achieved the cutting area, first must overe the enormous centrifugal force。 Even if it overcame the centrifugal force to enter the cutting area, also was possible as a result of the cutting area high temperature but to evaporate immediately, the cooling effect very small did not even have。 At the same time the cutting pound can cause the cutting tool edge of a sword the temperature intense change, is easy to cause the crack the production, therefore must pick the oil used/Gas cooling lubrication dry type cutting way. This way may use the pressed gas rapidly the cutting which the cutting area produces, thus the massive cuttings hotly will carry off,