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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>NTN bearing device cooperation and preparation before adjustment NTN bearing device cooperation and preparation before adjustment
.1) Scale changes and hardness changes from normal temperature to high temperature, /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
.2) Force changes and shape changes caused by centrifugal force at high speed.
In the high-speed, high-temperature conditions; from the cooperation and clearance selection to strive to adhere to the bearing precision and work function; this is difficult.
In order to ensure the deformation of the raceway behind the bearing device, the tomb is ridiculously ridiculously 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 蛘 蛘 蛘 蛘 蛘 蛘 蛘The cooperation is lax; therefore, the interference must be carefully calculated under the premise of thinking about the above two factors; the useful interference at normal temperature and normal speed may be invalid for NTN bearings.
If the result of the calculation is too large (usually as long as it is under ultra-high speed); as long as the two-layer smooth method of the under-smooth smoothing method and the static-pressure smoothing method is adopted; and such a plan may make the dmn value of the bearing Break the 3 million mark.
When thinking about the NTN bearing clearance, not only must consider the above factors; but also consider the influence of the thermal elongation of the shaft on the clearance; the bearing needs to be in the working condition; that is, the optimum clearance at the working temperature; The kind of play is formed in the state of accurate alignment between the inner and outer ring grooves. Because NTN bearings strive to reduce relative sliding and internal conflicts; the best way is to adjust the inner and outer rings relative to each other in the axial direction. The clearance of the ball bearing.
When thinking about the cooperative interference and clearance of the bearing; pay attention to the characteristics that the data becomes soft and simple deformation at high temperature; and the temperature change from normal temperature to high temperature repeatedly leads to the possibility of permanent eternal deformation.
2. Demand for host-related parts NTN bearing requirements Bearing position reversal system through fine dynamic balance; shaft and seat hole device bearings should have higher dimensional accuracy and shape accuracy than usual; especially coaxiality and shoulder Straightness of the seat hole or journal; while considering the time of these problems; it is necessary to pay attention to the high-speed elements and high-temperature elements in the bearing operation.
The shaft support system requires both high rigidity and the required quality as light as possible; in order to overcome this opposition; it can adopt methods such as reducing the appearance roughness and improving the appearance reinforcement to improve the support stiffness; using hollow shafts to reduce the system quality.
(1) Before the NTN bearing device; the appropriate skill should be used to measure the skill requirements on the design drawings; view the machining quality of the shaft and the seat hole and related parts (such as dimensional accuracy, shape accuracy and appearance roughness).
(2) If there are bumps, burrs, rust spots or solid particles (such as wear debris, sand, dirt) on the surface of the shaft and bearing housing, it will not only make the NTN bearing device difficult and the device orientation is incorrect; And if the solid particles fall into the NTN bearing, it will have a grinding effect; when the NTN bearing rotates, it will wear or scratch the working appearance of the NTN bearing; therefore, it is necessary to carefully check it before the device; if any of the above defects are found; Correction. For example, use oil sputum to remove burrs, bumps, rust spots; and use fine sand cloth to illuminate; and remove solid particles, dirt, etc.
(3) The surface of the device should be cleaned with a clean solution of gasoline, kerosene, toluene or xylene; and wiped with a clean rag; then coated with a thin layer of smooth oil; this will make the device more convenient.
(4) Open the NTN bearing package when the device is installed; immerse it in the above-mentioned gasoline and other liquids to gently change the hand; make sure to adhere to the frame; the rolling oil and the outer surface of the raceway are completely cleaned.
(5) When removing many NTN bearings; first use hot oil with a temperature of 90-100 °C to melt the encapsulating oil; use a seamless mouth and do not throw things to dig all the old oil; then rinse for a few minutes; Then use kerosene to rinse the oil; finally remove it with gasoline. After cleaning, clean the membrane; put the NTN bearing on the clean cloth on the workbench or dry it on the paper.
(6) Pay attention to the sealed NTN bearing can not be removed by this method; the inside of the seal should be kept as it is.
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Source: Bearing network time: 2013-01-09