2 ball Screw drive
The ball screw is still the main driving device of the high-speed servo system. It is driven directly by the AC servo motor and uses hydraulic bearings. The feed speed can reach 4060m/min, its acceleration can exceed 0.6g, and the cost is low. It is only a linear motor. 1/2.5.
(3) High-precision rapid feed system
Increasing the high-speed cutting feed rate is necessary to improve machining efficiency. At present, the cutting feed rate of high-speed machining centers is generally 20m/s~40m/s. To achieve and accurately control such high feed speeds, for high-speed machining center guides, ball screws, servo systems, table structures, etc. New requirements were put forward. With the development of motor technology, advanced linear motors have been introduced and successfully applied to CNC machine tools. The advanced linear motor drive eliminates the problems of mass inertia, lead, lag and vibration, which accelerates the servo response speed and improves the servo control accuracy and machine tool machining accuracy. The linear motor has high acceleration and deceleration characteristics, and the acceleration can reach more than 3g, which is 10 times to 20 times that of the conventional driving device, and the feed speed is 4 times to 5 times that of the conventional one.
(4) High performance control system
The excellent mechanical properties of high-speed cutting machine tools must be fully utilized through its excellent control performance. High-speed spindles and high-speed servo systems are inseparable from the development of control technology. Computer numerical control (CNC) systems for HSC must have high computational speed and accuracy, as well as fast response servo control. The CNC system of the HSC machine tool needs to calculate and process more data in the same period of time than the CNC system of the ordinary CNC machine tool, which requires the calculation processing capacity and speed of the former to be greatly improved. The hardware of the CNC system uses a powerful personal computer. Configuration. For example, Pentium chip, 64MB memory, 1~10GB hard disk, etc., reduce the execution time of the block to 30.5μs. On this basis, it is equipped with space spiral, parabola and spline interpolation function, speed pre-control function, digital automatic smooth motion The trajectory function, the jerk speed monitoring function during acceleration and braking, etc., make the workpiece machining quality significantly improved during high-speed cutting. Correspondingly, the servo system has been developed into digital, intelligent and software, so that there is no loss or delay in the A/D and D/A conversion between the servo system and the CNC system, especially the all-digital AC servo motor and control technology. It has been widely used. The main features of this technology are excellent dynamic characteristics, no drift, and extremely high contour accuracy, thus ensuring high feed rate processing requirements.
2. Features of high-speed machining technology:
(1) High-speed cutting has high processing efficiency. High-speed machining allows the use of a large feed rate, which is 5 to 10 times higher than conventional cutting, and the material removal rate per unit time can be increased by 3 to 6 times, and the processing time can be greatly reduced. This can be used to machine parts that require a large amount of metal removal, especially for the aerospace industry.
(2) The cutting force for high speed cutting is small. Compared with conventional cutting, the cutting force can be reduced by at least 30% during high-speed machining, which can reduce machining distortion for machining less rigid parts and make machining of thin-walled fine workpieces possible.
(3) The cutting heat of high-speed cutting has little effect on the workpiece. The high-speed machining process is extremely fast, with less than 95% of the cutting heat, and the parts do not warp or swell due to temperature rise. High-speed cutting is especially suitable for machining parts that are susceptible to thermal deformation. For the processing of metals with low melting point and easy oxidation (such as magnesium), high-speed cutting has a certain meaning.
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