Maintenance method for static pressure IKO bearing of grinding machine in IKO bearing

Static pressure IKO bearings have high rotation precision, good rigidity, high bearing capacity, no wear and high durability. 1. Small hole throttle:

(1). Change the internal throttling to external throttling, and add a pressure gauge to instantly display the upper and lower chamber pressure. It is easy to maintain, especially it can be cleaned regularly, which is unmatched by the internal throttle.

(2). Throttling ratio. The theoretical value of the throttle ratio β is between 1.2 and 1.5, and 1.25 is preferred based on years of experience. In this way, the geometric accuracy of the main shaft, the geometrical accuracy of the front and rear bearing pads, the concentricity, the roundness and the taper need to be strictly controlled in order to ensure the β value. The e value (the eccentricity of the main axis and the geometric center of the bearing bush) is determined according to the load carrying capacity of the machine tool to optimize the β value.

(3). When the oil chamber is not equipped with the main shaft, the oil column of each oil outlet must be consistent (observation method). If it is inconsistent, the flow rate should be changed by changing the orifice diameter of the throttle. Taking 4 chambers as an example, the oil column of the lower, left and right chambers is generally between 20 and 25 mm, and the diameter of the small holes is 0.25 to 0.4 mm.

2. Thin film feedback throttle:

The film feedback throttling IKO bearing stiffness is very large, but the machine tool often appears to hold the tile, pull the hair, reduce the pressure and so on. The most critical of the film feedback is the film. In practice, the main reasons for the bearing lock and pulling are: 1 plastic deformation of the film; 2 slow feedback. When the external load is abrupt, the shaft and the tile have already rubbed when the film has not reacted; 3 the film is fatigued. The film is used for a long time and fatigue deformation, which is equivalent to changing the feedback parameters.

Increased film thickness and the use of some fatigue-resistant materials can achieve good results. Generally, a rigid film, a preload, and a gap are reserved. The specific method is: change the 1.4mm thick film to a 4mm thick rigid film, and place a 0.05mm thick tin foil in the lower cavity to adjust the spindle to a position 0.05mm higher than the ideal position. The purpose is to return to the ideal center just after the spindle is stressed (grinding weight, cutting force).

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How to determine if SKF imported bearings should be replaced

The specific judgment method of whether the imported bearing should be repaired, that is, the specific judgment method that the imported bearing has been fully utilized and the damage is adjacent is as follows:

1) Using imported bearing working condition monitoring instrument

It is the most convenient and reliable method to judge the working state of the imported bearings and determine when the imported bearings should be repaired by using the instrument such as the iron spectrometer or the SPM or I-ID-1 type imported bearing working condition monitoring instrument.

For example, when using the HD-1 type instrument, when the pointer approaches the danger zone from the warning zone, and the pointer does not return after taking measures such as improving lubrication, it can be found that the problem of the imported bearing itself is not yet dangerous. When the zone is in place, the imported bearings will be repaired. How far from the danger zone begins to repair, can be adjusted by experience.

With such an instrument, it is possible to make full use of the working potential of the imported bearings, timely repair the imported bearings, and avoid failures, which is safe and economical.

2) Monitor with simple tools

In the case where the above instruments are not available, the operator can hold the tool such as a round bar or a wrench against the outer casing of the machine that is closest to the imported bearing, and shame the ear on the tool to monitor the running sound of the imported bearing transmitted by the tool. Of course, the medical stethoscope is modified. Also.

The normal imported bearing operation sound should be uniform, smooth and not harsh, and the abnormal imported bearing operation sound has various intermittent, impact or harsh sounds. First of all, we should get used to the normal operation of the imported bearings, and then we can grasp the abnormal operation of the imported bearings, and then through the accumulation of practical experience, we can further analyze what kind of abnormal sound corresponds to what kind of imported bearings. normal phenomenon. There are many types of abnormal sounds in imported bearings, which are difficult to tell, and mainly rely on experience accumulation.

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