The causes of noise produced by the spindle of the

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The reason why the spindle of NC machine tool produces noise and how to solve it

in many CNC machine tools, because the speed change system of the spindle still uses several transmission shafts, gears and bearings, vibration noise, friction noise and impact will inevitably be generated in the work. The noise can be seen from the lower part of the force measuring cylinder. The speed change of the main transmission system of CNC machine tools is completed by computer control when the machine tools do not stop working. Therefore, it produces more noise than ordinary machine tools, but it may not be as continuous as expected, which is more representative. If the mechanical system is subjected to any external exciting force, the system will respond to this exciting force and vibrate. This vibration energy spreads in the whole system. When it spreads to the radiation surface, this energy is converted into pressure waves, which are transmitted through the air, that is, acoustic radiation

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therefore, the three steps of excitation response, internal transmission of the system and sound radiation are the formation process of vibration noise, friction noise and impact noise

(1) the main transmission system of CNC machine tools mainly relies on gears to complete the speed change and transmission for protection. Therefore, the meshing transmission of gears is one of the main noise sources

(2) the assembly, preload, concentricity, lubrication conditions of bearing, journal and support hole, as well as the load acting on the bearing and radial clearance, have a great impact on the noise. Moreover, the manufacturing deviation of the bearing itself determines the noise of the bearing to a large extent

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