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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Some experiences in the repair of grinding machine hydrostatic bearings Some experiences in the repair of grinding machine hydrostatic bearings
Hydrostatic bearings are widely used in M210, M131W, 3160A grinding machines and 2A710, FYT10 diamond boring heads due to their high reversal accuracy, good rigidity, high bearing capacity, no wear and high durability. Followed by CNC technology; static pressure Bearings are also widely used in the machining of spindles for CNC machine tools in the middle. One of the top engine plants of the company; there are many static pressure grinders and static pressure diamond hoes; some investigations and tests were carried out during the repair; several experiences were obtained. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
1. The small hole saver (1) changes the internal saving to external saving; and the pressure gauge is used to instantly display the upper and lower chamber pressures, which makes the repair and maintenance convenient; especially, it can be easily cleared regularly; this is unmatched by the internal saver. 2) Saving ratio. The theoretical value of saving ratio β is between 1.2 and 1.5; and based on years of experience, it is better to be 1.25. This is in repair; several precisions on the spindle, several front and rear bearing pads are required. Accuracy, concentricity, roundness and taper are strictly controlled; in order to ensure the β 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) Each oil When the cavity is not equipped with the spindle; the oil column of each oil outlet must be common (observation method); if not common; the method of changing the aperture of the saver should be adopted; change the flow rate. Take 4 chambers as an example; usually lower, left, The oil column in the right chamber is between 20 and 25 mm; the diameter of the small hole 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. Add the thickness of the film and use some fatigue-resistant materials; all can receive excellent results. Usually choose rigid film, pre-load, and reserve gap. The detailed method is: 1.4mm thick The film is changed to a 4mm thick rigid film; the 腔人 cavity pad is 0. 05mm thick tin foil paper; the spindle is adjusted to an orientation higher than the ambition azimuth of 0.05 mm. The intention is when the main shaft is stressed (grinding wheel component, cutting force); Return to the middle of 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 maintaining the static pressure bearing. The oil supply system is improved on the basis of the original system. (1) After saving the plate The oil outlet is connected to the pressure relay and the pressure gauge (originally in front of the accumulator); 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; so as to stop immediately; prevent the bearing from locking Such as: inlet pressure 2MPa; outlet pressure 1. 2 ~ 1. 6MPa; less than 1. 2MPa will stop. (2) adding digital detection equipment hydrostatic bearing between the main shaft and the bearing shell between 0. 04 ~ 0. 05mm gap; the oil in between has a certain resistance value; detect the change of this resistance; you can know the thickness of the period gap. The main axis is one pole; the bearing is the other pole; measure its resistance change. This signal is sent to the photoelectric alarm and the control system amplifier after handling; it controls the start and stop of the spindle motor; thus preventing the axis from conflict with the tile.
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Source: China Bearing Network Time: 2017-09-24