Causes and solutions of noise generated by spindle of deep hole drilling machine
In many deep hole drilling machines, a number of transmission shafts, gears and bearings are still used in the gearshift system of the main shaft, so it is inevitable to produce vibration noise, friction noise and impact noise in the work. The transmission of the main transmission system of the deep hole drilling machine is controlled by the computer under the condition of the machine without stopping the work. Therefore, it is more continuous and representative than the noise produced by the ordinary deep hole drilling machine. Mechanical system is subjected to any external excitation force, and the system will vibrate in response to the excitation force. This vibrational energy propagates throughout the system, and when transmitted to the radiation surface, the energy is converted into a pressure wave, which is transmitted again through the air, that is, acoustic radiation.
Therefore, the three steps of excitation response, system internal transmission and sound radiation are the formation process of vibration noise, friction noise and impact noise.
(1) the main transmission system of deep hole drilling machine mainly depends on gear to complete speed change and transmission. Therefore, the meshing transmission of gears is one of the main sources of noise.
(2) the assembly, pretightening force, concentricity, lubrication conditions and the size of the load on the bearing and the radial clearance have a great influence on the noise of the bearing and the shaft neck and supporting holes. Moreover, the manufacturing error of the bearing itself determines the noise of the bearing to a large extent.
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