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Repair method for static pressure imported bearings of grinding machines in imported bearings
Source: China Bearing Network Time: 2014-01-15
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1. Hole saver:
.1). 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.
.2). 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.
.3). When the oil chamber is not equipped with the spindle; 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 .
Adding the thickness of the film and changing to some fatigue-resistant materials; can receive outstanding results. Usually the rigid film, pre-loading, and clearance are used. The detailed method is: change the film of 1.4mm thickness to 4mm Thick rigid film; 腔人 cavity pad 0. 05mm thick tin foil paper; the spindle is adjusted to a height of 0.05 mm higher than the azimuth orientation. The intention is to force the spindle (grinding wheel component, cutting force); just return to the middle of the 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.
.1). 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.
.2). Add a digital detection device:
There is a gap between 0. 04 and 0. 05mm between the main shaft of the static pressure imported bearing and the bearing bush; the oil in the process has a certain resistance value; detecting the change of the resistance value; the length of the gap can be known. One pole; the bearing is the other pole; measure its resistance change. Dispose of this signal to the photoelectric alarm and control system amplifier; control the start and stop of the spindle motor; to prevent the axis and tile conflict.
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