CNC cutting machine equipment precision
In order to meet the needs of the market, the sudden emergence of numerical control system technology has also provided conditions for the technological advancement of CNC machine tools. Modern manufacturing technology puts forward higher requirements for numerical control technology. Here we will introduce some of the world's numerical control technology and its equipment development. Mainly reflected in the following aspects of technical characteristics:
The development of precision from precision machining to ultra-precision machining is the direction that every industrial power in the world is committed to. Its accuracy ranges from micron to submicron, even to nanometer ("10NM"), and its application range is becoming increasingly widespread.
At present, under the high-precision requirements of machining, the machining accuracy of general-grade CNC machine tools has been improved from ±10μM to ±5μM; the machining accuracy of precision-grade machining centers has been increased from ±3 to 5μM to ±1 to 1.5μM, even Higher; ultra-precision machining accuracy into the nano-level (0.001 microns), spindle rotation accuracy requirements of 0.01 ~ 0.05 microns, processing roundness of 0.1 microns, processing surface roughness RA = 0.003 microns and so on. These machines generally use the vector control of the variable frequency drive electric spindle (motor and spindle integration), the spindle radial runout is less than 2μM, axial turbulence is less than 1μM, shafting unbalanced degree reached G0.4 level.
The feed drive for high-speed, high-precision machining machines includes two types: "rotary servo motor plus precision high-speed ball screws" and "linear motor direct drive." In addition, emerging parallel machine tools are also easy to achieve high-speed feed. Due to its mature technology and wide range of application, the ball screw has not only high precision (ISO34081), but also high speed and low cost, so it is still used by many high-speed machining tools. At present, the maximum moving speed of the high-speed machining tool using a ball screw drive is 90M/MIN. The acceleration of the 1.5G ball screw is a mechanical transmission. Inevitably, elastic deformation, friction, and backlash occur in the driving process, which in turn causes movement lag and other problems. In order to eliminate the influence of these errors on machining accuracy, linear errors were applied directly on the machine tool in 1993. Since there is no intermediate link “zero transmissionâ€, not only the inertia is small, the system stiffness is large, and the response is fast. It achieves very high speed and acceleration, and its stroke length is theoretically unlimited. Positioning accuracy is also easily achieved at higher levels under high-precision position feedback system. It is ideal for high-speed and high-precision machining tools, especially medium and large-sized machine tools. De drive method. At present, the maximum rapid traverse speed of a high-speed, high-precision machine tool using a linear motor has reached 208M/MIN, an acceleration of 2G, and there is still room for development.
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