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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Selection of oil-free self-smooth bearing Oil-free self-smooth bearing selection
In order to deal with the high temperature, low speed, heavy load, large dust, water shower and shock oscillating smoothness in mechanical equipment; oil-free self-smooth bearing is selected. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
1. The layout of the bearing from the smooth bearing is to develop the appropriate holes in the metal collision surface of the bearing matrix; and embed the molybdenum disulfide, graphite and other composite self-lighting sliders embedded in the metal sleeve; Composite bearing; solid smoothing agent friction area of ​​25-65%. Solid self-lighting slider can work normally at 280 ° C high temperature. However, due to its low mechanical strength; load bearing ability is weak; easy to deform; it is embedded in metal The defect can be pressed in the hole groove; the metal is formed to bear some bearing effect; the smoothing effect from the light slider.
The smooth mechanism of the self-smooth bearing is in the process of the sliding conflict between the shaft and the sleeve; a part of the smooth material is transported to the metal surface of the shaft; the small flat surface is filled; and a stable solid smoothness is formed. Membrane; constitutes a solid smooth film between the grinding; avoids the adhesion between the shaft and the sleeve. This rationality summarizes the complementary strengths of the copper alloy and the non-metal grinding data; uniquely suitable for oil-free, high temperature, high load Low speed; anti-fouling, anti-corrosion, moving range in strong radiation environment; and special working conditions under the condition that the water or other solution is moisturized and the bottom is unable to add smooth grease.
2. The area occupied by the self-lighting slider is related to the working speed and bearing strength of the self-lighting slider; the working speed is low and the bearing strength is large; the area occupied by the metal should be larger. The area of ​​the wheel bearing from the light slider is about 25%; the bearing of the spindle is smooth and plentiful; the bearing strength is not large; the area occupied by the light slider is about 65%.
3, the technical requirements of the bushing material bushing should be made of alloy copper; the bushing should have a higher hardness; usually heat treatment; its hardness is not lower than HRC45.
4. Several shapes and inlay requirements of the self-lighting slider. The shape of the self-lighting slider has two kinds of cylindrical shape and rectangular shape; the self-smoothing can be selected from the cylindrical shape according to the size of the area; instead, a rectangular shape can be used. Inlaid and strong; to prevent falling in the work.
5. Cooperating gap value between bushing and shaft The linear expansion coefficient of the self-lighting slider is about 10 times that of steel. It is the change of custom bearing temperature; the gap between shaft and bushing is four-stage dynamic cooperation of original metal parts (D4/DC4) 0. 032 ~ 0. 15MM; increased to 0. 45 ~ 0. 5MM. From the light slider on the side of the conflict, the outstanding bushing metal 0. 2 ~ 0. 4MM. This will be abundant in the initial running-in period of the bearing operation Smooth; cut the cost of power drag power.
6, oil-free from the strength of the smooth bearing A, no oil smooth or less oil smooth; suitable for places that can not be refueled or difficult to refuel; can be used in the protection or less protection,
B, good wear resistance; conflict coefficient. lemon 倜ムC, excessive elastoplasticity; can spread the stress on a wider touch surface; improve the bearing capacity of the bearing,
D. Near the static motion conflict coefficient; can eliminate the flaw at low speed; then ensure the accuracy of the machine operation,
E. It can make machinery reduce oscillation, reduce noise, avoid pollution; improve working conditions,
F. It can form a carrying film during the operation; it can protect the shaft from grinding;
G. The hardness requirement of the grinding shaft is low; the unscheduled shaft can be used; then the processing difficulty of the associated parts is reduced.
H, thin wall layout, light weight; can reduce mechanical volume,
I. The bushing material is brass; it can be used in corrosive media.
After the theory of an aluminum company; the casting machine bearing changed to oil-free self-smooth bearing; it has been used for 15 months; and still working; the gap between the shaft and the bushing does not exceed 1MM; it is estimated that it can be used for another 12 months; Beyond the original life of the application (2 months).
Oil-free self-smooth bearings can not only be used well in aluminum ingot casting machines; they can be used together without oil, high temperature, high load, low speed; anti-fouling, anti-corrosion, moving radiation in strong radiation environment; and in water Or equipment under special working conditions where the solution is moisturized and the base cannot be smoothed; such bearings have a wide range of implementation values.
At present, most of the bearings used in various machinery industries are still balls, needles and the like; but some have chosen self-smooth bearings; trust will soon come from smooth bearings will become the dominant bearing. The following are some of the characteristics of self-smooth bearings. And advantages:
1, no oil smooth or less oil smooth; suitable for places that can not be refueled or difficult to refuel; can be used without protection or less protection,
2, good wear resistance; conflict coefficient. Lemon 倜ム3, excessive elastoplasticity; can spread the stress on a wider touch surface; improve the bearing capacity of the bearing,
4. Near the static motion conflict coefficient; can eliminate the flaw at low speed; then ensure the accuracy of the machine operation,
5, can make machinery reduce oscillation, reduce noise, avoid pollution; improve working conditions,
6. It can form a carrying film during the operation; it can protect the shaft from grinding;
7. The hardness requirement of the grinding shaft is low; the shaft that has not been tempered and treated can be used; then the processing difficulty of the associated parts is reduced.
8, thin wall layout, light weight; can reduce the mechanical volume,
9, the reverse side of the steel can be electroplated with a variety of metals; can be used in corrosive media, has been widely used in various mechanical sliding parts; for example: printing presses, textile machines, tobacco machinery, micro-motors, automobiles, motorcycles and agricultural and forestry machinery and many more.
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Oil-free self-smooth bearing selection
Source: China Bearing Network Time: 2014-06-01