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(1) High speed.
Because the spindle speed of high-speed machine tools is much higher than that of conventional machine tools and there is a tendency to continue to increase, in order to ensure the smooth operation of high-speed cutting, reduce the idle time, improve machining efficiency, and in order to ensure the feed per tooth cutter The same amount, to extend the service life of the tool, to ensure the quality of the parts, requires the feed system must provide a sufficiently high feed rate. At present, the basic requirements for the feed speed of high-speed machine tools are 60m/min or more, and special cases can reach 120m/min or even higher.
(2) High acceleration.
Since the working range of most high-speed machined parts is only a few tens to hundreds of millimeters, if you can not provide a great acceleration to ensure high speed in an instant (in a very short stroke) and an instant quasi-stop in a high speed stroke, high speed It is meaningless, so it also puts high requirements on the acceleration of high-speed machine tool feed motion. At present, the general high-speed machine tool requires a feed acceleration of 1 to 2g, and some ultrahigh-speed machine tools require a feed acceleration of 2 to 10g.
(3) High precision.
Accuracy is a key technical indicator of a machine tool, and high-speed machine tools have a particularly high demand for accuracy. In the case of high-speed motion, the dynamic performance of the feed drive system has a great influence on the machining accuracy of the machine tool. With the continuous increase of feed speed, the following error of each coordinate axis will become more and more prominent on the accuracy of the synthetic trajectory. Therefore, high-speed machine tools must improve the accuracy of the closed-loop control of the position of each coordinate axis on the one hand, on the other hand, It is also necessary to study the trajectory control method and implementation technique under high-speed conditions from the perspective of synthetic trajectory and closed-loop control.
(4) High reliability and high security.
In the case of high-speed machining, if the reliability and safety of the machine tool are poor, it will have catastrophic consequences, which is more stringent than the requirements of ordinary CNC machine tools. Because the feed servo system is the interface between the strong and weak power in the CNC machine tool, its failure rate is generally higher, and it has a greater impact on the reliability of the machine tool; on the other hand, the feed system contains moving parts. If you lose control at high speed, it will be very dangerous. Therefore, improving the reliability and safety of the high-speed feed system has important significance for improving the overall performance of high-speed machine tools.
(5) Reasonable costs.
Under the premise of guaranteeing quality and performance, the manufacturing cost of high-speed machine tools is reduced, and their cost performance is improved.
Because the spindle speed of high-speed machine tools is much higher than that of conventional machine tools and there is a tendency to continue to increase, in order to ensure the smooth operation of high-speed cutting, reduce the idle time, improve machining efficiency, and in order to ensure the feed per tooth cutter The same amount, to extend the service life of the tool, to ensure the quality of the parts, requires the feed system must provide a sufficiently high feed rate. At present, the basic requirements for the feed speed of high-speed machine tools are 60m/min or more, and special cases can reach 120m/min or even higher.
(2) High acceleration.
Since the working range of most high-speed machined parts is only a few tens to hundreds of millimeters, if you can not provide a great acceleration to ensure high speed in an instant (in a very short stroke) and an instant quasi-stop in a high speed stroke, high speed It is meaningless, so it also puts high requirements on the acceleration of high-speed machine tool feed motion. At present, the general high-speed machine tool requires a feed acceleration of 1 to 2g, and some ultrahigh-speed machine tools require a feed acceleration of 2 to 10g.
(3) High precision.
Accuracy is a key technical indicator of a machine tool, and high-speed machine tools have a particularly high demand for accuracy. In the case of high-speed motion, the dynamic performance of the feed drive system has a great influence on the machining accuracy of the machine tool. With the continuous increase of feed speed, the following error of each coordinate axis will become more and more prominent on the accuracy of the synthetic trajectory. Therefore, high-speed machine tools must improve the accuracy of the closed-loop control of the position of each coordinate axis on the one hand, on the other hand, It is also necessary to study the trajectory control method and implementation technique under high-speed conditions from the perspective of synthetic trajectory and closed-loop control.
(4) High reliability and high security.
In the case of high-speed machining, if the reliability and safety of the machine tool are poor, it will have catastrophic consequences, which is more stringent than the requirements of ordinary CNC machine tools. Because the feed servo system is the interface between the strong and weak power in the CNC machine tool, its failure rate is generally higher, and it has a greater impact on the reliability of the machine tool; on the other hand, the feed system contains moving parts. If you lose control at high speed, it will be very dangerous. Therefore, improving the reliability and safety of the high-speed feed system has important significance for improving the overall performance of high-speed machine tools.
(5) Reasonable costs.
Under the premise of guaranteeing quality and performance, the manufacturing cost of high-speed machine tools is reduced, and their cost performance is improved.
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