Maintenance of the grinder the static pressure NTN Bearing

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Static pressure NTN bearig its high rotary precision, rigidity and high bearing capacity, wear, high durability. The following hydrostatic NTN Bearing explore and try to obtain some experience in the repair proc ess, only for your reference.
An orifice restrictor:
(1). Internal throttle to external throttle, and to install a pressure gauge real-time display of the upper and lower cavity pressure. Maintenance, in particular, can easily be cleaned regularly, the internal restrictor unmatched.
(2). Throttling ratio. Throttling than the theoretical value of β is between 1.2 to 1.5, based on years of experience to preferably 1.25. Such maintenance, geometrical precision spindle, front and rear bearing geometric accuracy, concentricity, roundness and taper strict control, in order to ensure that the value of β. E values ??(spindle and the geometric center of the eccentric amount of the pad) is determined according to the carrying capacity of the machine tool, so that the optimum value of β.
(3) when the spindle is not installed, the oil chamber, oil outlet of the oil column must be the same (observation), if not, should be taken to change the restrictor aperture changes its flow. 4 cavities, for example, generally under, left and right chamber of the oil column in the range of 20 ~ 25mm, a small pore diameter was 0.25 to 0.4 mm.
Film feedback restrictor:
Stiffness of the the film Feedback throttle NTN Bearing is great, but the machine is running, often hold tile, brushed off pressure phenomenon. The most critical feedback film film practice that the bearing locking the main reason for napping: â'  The film plastic deformation due; â'¡ feedback slow. The film did not react when the external load mutations axis and tile has been friction; â'¢ film fatigue. Film using a long time, fatigue deformation, the equivalent of changing the feedback parameters.
Increase the thickness of the film and to switch to some of the fatigue resistance of materials, can receive good results. The generally rigid film, a pre-load, reserved slit. Practice: 1.4mm thick membrane to 4mm thick rigid film, the next the cavity pad 0.05mm t hick aluminum foil, adjusted to higher than the ideal position 0.05mm position of the spindle. When the spindle force (wheel weight, cutting force), just return to the ideal center.
Supply system improvements:
Static pressure NTN bearing oil supply system, in addition to the coarse filter, fine filter, the rest of the components has a protective effect on the static pressure NTN Bearing. To improve the fuel supply system on the basis of the original system.
(1) the original in front of the accumulator, so the operator can see the size of the chamber pressure and pressure in the relay and pressure gauge connected to the pressure of the oil port after the throttle plate. When the pressure is greater than a certain value, in order to be shut down immediately, to avoid bush Hugging. Such as: pressure 2MPa, exit chamber pressure 1.2 ~ 1.6MPa, we should shut down lower than 1.2MPa.deep grove ball bearing
(2) increase the digital detection device:
HIP NTN bearing between the spindle and the bush with a clearance of 0.04 ~ 0.05mm, therebetween oil has a certain resistance value, the detection of the resistance change of size of the gap, can be learned. Spindle pole, bush for another, to measure the change in resistance. Hair after this signal processing to the the photoelectric alarm and control system amplifier control the start and stop of the spindle motor, in order to avoid friction axis and tile.