Linear motor used in machining center is not a new thing in foreign countries, but it is new in China. First of all, let me introduce the linear motor. At present, most of the CNC machine tools use servo motor and rolling screw to drive the linear coordinate axis. The appearance of linear motor has changed completely. Linear motor can directly replace servo motor and rolling screw to drive linear coordinate axis. The linear motor drives the coordinate axis for linear motion, which does not need to change the rotary motion into linear motion like the servo motor and rolling screw. The linear motor directly saves these tedious conversion steps.
Servo motor and linear motor of rolling screw
Characteristics of linear axis driven by linear motor
Linear motor driving linear coordinate axis is characterized by high speed, high efficiency and excellent rigidity, but there are still some problems with linear motor, such as high price, high heat output, poor transmission stability and so on. At present, CNC machine tools still use servo motor and rolling screw to drive linear coordinate axis, and servo motor and rolling screw drive linear coordinate together Axis is still the mainstream of the market.
Which machining centers use linear motors
Although there are many problems in using linear motor to drive linear coordinate axis, there are still some machining centers. For example, high-speed machining center boldly adopts linear motor to drive linear coordinate axis, and high-speed machining center adopts linear motor to drive linear coordinate axis, which is relatively common in foreign countries and less in China, because domestic linear motor technology is not very mature, so it is generally used The manufacturers dare not boldly adopt this kind of practice. However, foreign manufacturers of machining centers are different. In pursuit of processing efficiency, they boldly adopt linear motor to drive linear coordinate axis. For example, dmc75v linear high-speed machining center of German demage company adopts linear motor to drive linear coordinate axis, and its axial acceleration reaches 2G and fast stroke speed reaches 90m / min. thus, the speed of linear motor driving linear coordinate axis in high-speed machining center is 2-3 times higher than that of conventional high-speed machining center using servo motor and rolling.
To sum up, only high-speed machining center can drive linear axis by linear motor. At this stage, using linear motor to drive linear coordinate axis is not the mainstream. I believe that in the future, due to the gradual maturity of linear motor technology and the downward trend of price, the linear motor will directly replace the servo motor and rolling screw to drive the linear seat
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