Composite bearing for its high rotary precision, good rigidity, high bearing capacity, no wear and high durability.Below is the static pressure NTN bearing in exploration and try to get some experience in the process of maintenance:
1. The hole choke:
(1). Change the internal throttling to external throttling, and equipped with pressure gauge pressure inferior vena instantly.Make maintenance convenient, especially can easily be regular cleaning, this is an internal choke.
(2). The throttling ratio.Throttle than the theoretical value is between 1.2 ~ 1.5 beta, and according to many years of experience in 1.25 is preferred.In maintenance, so need to the geometrical precision of the spindle bearing shell geometric accuracy, before and after, with the shaft taper, roundness, and strictly control, in order to ensure the beta.Determined according to bearing capacity of the machine tool for e (eccentricity) to the center of the main shaft and bearing shell geometry, the beta value is the best.
(3). The oil cavity when don't put the spindle, the oil outlet of oil column must agree (observation), if inconsistent, should be taken to change the choke aperture method, to change its flow.4 cavity, for example, generally, left, right cavity under the oil column, between 20 to 25 mm hole diameter is 0.25 ~ 0.4 mm.
2. The improvement of fuel supply system:
Static pressure NTN bearing oil supply system, in addition to the coarse and fine filter, the rest of the various components of static pressure NTN bearing plays a protective role.On the basis of the original system to improve the oil supply system.
(1). After the throttle plate of oil outlet pressure relay and pressure gauge (original) in front of the accumulator, which can make the operator saw the size of the cavity pressure and stress.When the differential pressure is greater than a certain value, in order to stop immediately, to avoid bearing lock.Such as: pressure 2 MPa, the oral cavity pressure 1.2 ~ 1.6 MPa, less than 1.2 MPa will stop.(2). Add digital detection device:
Static pressure NTN bearing between the shaft and bearing shell is 0.04 ~ 0.05 mm gap, during which the oil has a certain resistance, detecting the change of the resistance, can know the size of the gap.For spindle, bearings for other, measuring the resistance change.To the signal processing of backwardness to photoelectric amplifier alarm and control system, control of the spindle motor start-stop, to avoid friction shaft with tile.
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