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Some exploration and testing of grinding machine hydrostatic bearings in repair
Source: China Bearing Network Time: 2014-04-06
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1. Hole saver. 1) Change internal savings to external savings; add pressure gauge to instantly show upper and lower chamber pressure. Make repair and maintenance convenient; especially it can be easily cleared regularly; this is unmatched by internal saver.
.2) savings ratio. The theoretical value of the savings ratio β is between 1.2 and 1.5; and based on years of experience, preferably 1.25. This is in repair; requires a few precisions on the spindle, front and rear bearing pads. Strict control of precision, concentricity, roundness and taper; in order to ensure the beta 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 chambers are not equipped with the main shaft; the oil columns of the respective oil outlets must be common (observation method); if not, the method of changing the aperture of the saver should be adopted; the flow rate should be changed. Take 4 chambers as an example; Usually, the oil column of the lower, 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. The film reaction saver 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 bearing is locked and napped. The primary reasons are: 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; Changed 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. The oil supply system improves the static pressure bearing oil supply system; except for coarse filtration and fine filtration; other components have the effect of guaranteeing the hydrostatic bearing. The oil supply system is improved on the basis of the original system.
.1) Connect the pressure relay and the pressure gauge (which is in front of the accumulator) after the plate is saved; 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; Stop immediately; 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) Adding a digital measuring device The hydrostatic bearing has a gap of 0. 04 to 0.05 mm between the main shaft and the bearing bush; the oil in between has a certain resistance value; detecting the change of the resistance value; The size of the gap. The main axis 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; The conflict of the tile.
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