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Analysis of Repair Methods for Static Bearings of Grinding Machines in Imported Bearings
Source: China Bearing Network Time: 2014-08-27
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Change internal savings to external savings; add pressure gauges to instantly show upper and lower chamber pressures, making repairs and maintenance convenient; especially for easy time-clearing; this is unmatched by internal savers.
Savings ratio. The theoretical value of the saving ratio β is between 1.2 and 1.5. According to the experience of many years, it is better to be 1.25. This is in the repair; several precisions of the spindle, several precisions of the front and rear bearing pads are required, Coaxiality, roundness and taper are strictly controlled; in order to ensure the β value. According to the load of the machine tool, the e value (the amount of misalignment between the main shaft and the bearing bush) can be determined; the β value is optimal.
When the oil chamber is not equipped with the main shaft; the oil column of each oil outlet must be common (observation method); if not common; the method of changing the aperture of the saver should be adopted; change the flow rate. Take 4 chambers as an example; usually, The oil column in the left and right chambers is between 20 and 25 mm; the diameter of the small holes is from 0. 25 to 0.4 mm.
2. Thin film reaction saver:
The film reaction saves the bearing stiffness is very large; but the machine tool often exhibits the appearance of tiling, pulling, and falling pressure during the operation. The most important factor in the film reaction is the film; in practice, the primary reason for the bearing lock and pulling is: 1 caused by plastic deformation of the film, 2 slow reaction. When the external load suddenly changes; when the film has not reacted; the axis and the tile are now in conflict, 3 the film is tired. The film is used for a long time; fatigue deformation; equivalent to changing the reaction parameters .
Prev12 Next page Add the thickness of the film and switch to some fatigue-resistant materials; you can receive outstanding results. Usually choose rigid film, pre-load, and reserve gap. The detailed method is: 1. 4mm thick film is changed to 4mm thick rigid film; 腔人 cavity cushion is 0. 05mm thick tin foil paper; the main shaft is adjusted to a height higher than the ambition azimuth of 0. 05mm. The intention is that after the main shaft is stressed (grinding wheel component, cutting force) Just returned to the middle of ambition.
3. Improvement of the oil supply system:
Static pressure imported bearing oil supply system; in addition to coarse filtration, fine filtration; other components have a protective effect on hydrostatic bearings. On the basis of the original system to improve the oil supply system.
After the saving plate, the oil outlet is connected to the pressure relay and the pressure gauge (originally in front of the accumulator); this allows the operator to see the pressure of the chamber pressure and the inlet pressure. When the pressure difference is greater than a certain value; Prevent the axle from locking. For example: the inlet pressure is 2 MPa; the outlet pressure is 1. 2 to 1.6 MPa; less than 1.2 MPa is to stop.
Adding digital detection equipment The static bearing of the imported bearing has a gap of 0. 04 ~ 0. 05mm between the main shaft and the bearing bush; the oil in between has a certain resistance value; detecting the change of the resistance value; Large size. The main shaft is one pole; the bearing bush is the other pole; the resistance value is measured. This signal is sent to the photoelectric alarm and the control system amplifier; the spindle motor is controlled to start and stop; thereby preventing the shaft and the tile conflict.
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