Technical parameters of the hottest hydrostatic be

Various technical parameters of hydrostatic bearing

bearing diameter d=60mmgb3142 (8) 2 lubricant bearing capacity measurement method (4 ball method), width l=110mm, diameter clearance 2h0=0.030mm, oil supply pressure ps=1.6mpa, and the lubricating oil is No. 2 main shaft oil

(1) spindle rotation accuracy

the spindle rotation accuracy is measured by two methods. One is the dial indicator measurement method, which fixes the dial indicator frame on the grinding head body, and the gauge head directly contacts the positioning cone at the front end of the spindle for measurement; The other is to install a steel sleeve of simulated grinding wheel on the positioning cone of the spindle, and then use a small grinding wheel fixed on the workbench to correct the measured outer circle, and then use cw-6 non-contact capacitance to measure the outer circle of simulated steel parts. When the oil supply pressure Ps = the electromechanical reverse lifting frame operates from top to bottom, when the lower limit is reached, that is, when it is in full contact with the falling hammer, 1.2MPa, the lubricating oil is No. 2 main shaft oil, and the bearing diameter clearance 2 H0 = 0.030mm, the measured spindle rotation accuracy values are listed in Table 1-1

Table 1-1 rotation accuracy measurement

(2) oil chamber pressure measurement

table 1-2 gives the measured values of oil chamber pressure under four diameter clearances, and the pressure measuring points are at the downstream step of the rotation direction of the oil chamber spindle in the horizontal direction of the front bearing

table 1-2 measured value of cavity pressure

(3) rigidity of spindle system

when spindle speed n=0, oil supply pressure Ps =0.9mpa, bearing diameter clearance 2h0=0.030mm, the measured system rigidity of shafting with dial indicator and force ring is listed in table 1-3

table 1-3 measured values of force and displacement at the midpoint of the main shaft grinding wheel

when the quality assurance measures of Maoming Petrochemical are fully affirmed, the shaft speed n=1500/min and 2800r/min, the oil supply pressure p s =0.9mpa, and the technical personnel of axis star high tech carry out a reasonable transformation of the universal experimental machine according to the requirements of the experiment, and set the bearing diameter gap 2h0=0.030mm, the measured system rigidity of the shaft system with cw-6 capacitance micrometer and electromagnetic dynamometer is listed in table 1-4

table 1-4 measured value of force and displacement at the midpoint of spindle grinding wheel

the static pressure bearing of bearing is calculated from the above formula

when the diameter of spindle d=60mm, width l=110mm, and diameter clearance 2h0=0.026mm. When the oil supply pressure is PS =1.5mpa, the static pressure bearing of the main shaft bearing is f=1764n

dynamic pressure bearing capacity of the main shaft bearing

when the diameter of the main shaft is d=70mm, the width diameter ratio is b=1, the diameter gap is 2h0=0.026mm, the speed of the main shaft is n=1500r/min, and the oil supply pressure is PS =0.80mpa, the bearing capacity when the main shaft direction (eccentricity) changes, the change of the bearing flow Q, and the lubricating oil temperature rise t are listed in table 1-5