The maximum spindle speed of the machine is 24000r/min, and the maximum feed rate of the table is 60m/min. At the same time, Ingersoll of the United States has adopted the permanent magnet developed by American Anorad in its HVM-800 high-speed machining center. Linear motor. The maximum spindle speed is 20000r/min, and the maximum feed rate of the table is 76.2m/min. The application of linear motor in high-speed machining center has sensationalized the international machine tool industry and academia. Since then, linear motors have sprung up in various industrialized countries around the world [7>. The main advantages of the linear motor feed drive are as follows:

(1) High speed Because the linear motor directly drives the table, there is no intermediate mechanical transmission component, no rotary motion, and it is not affected by centrifugal force. It can easily realize high-speed linear motion. At present, its maximum feed speed can reach 80-120m/ Min.

(2) Acceleration large linear motor has large starting thrust, simple structure and light weight, and the transition process during motion change is short, which can achieve sensitive acceleration and deceleration, and its acceleration can be as high as (2~10)g.

(3) High positioning accuracy The linear motor feed system uses the grating scale as the position measuring component, and adopts closed-loop control to accurately control the displacement accuracy of the table through feedback. Therefore, the stiffness of the new feed is high, and the positioning accuracy is as high as 0.1-0.01. m.

(4) Recently, the United States Cincinnati Milacron produced a HyperMach large-scale high-speed machining center for the aviation industry with a spindle speed of 60000r/min and a main motor power of 80kW. A linear motor with a X-axis stroke of 46m and a maximum feedrate of the table 60m/min, fast stroke 100m/min, acceleration 2g. It takes only 30min to machine a large thin-walled aircraft part on this machine; the same part is processed on a general high-speed milling machine, which takes 3 hours; it is processed on ordinary CNC milling machine. Then need 8 h. The ball screw table takes 0.5 s from standstill to 25 m/min, while the linear motor table takes only 0.05 s from standstill to 75 m/min. The excellent acceleration performance of linear motors is evident.

(Finish)

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