The choice of oil-free self-lubricating bearings

Choose oil-free self-lubricating bearings
    In order to solve the high temperature mechanical equipment, low-speed, heavy-duty, large dust, water, shock and vibration have shower and lubrication problem, use oil-free self-lubricating bearings.
    1. The bearing structure of self-lubricating bearings are arranged in order to develop friction surface of the metal substrate bearing an appropriate size cavities, and embedded into a composite molybdenum disulfide and graphite self-lubricating block embedded in a metal sleeve, made of composite bearing, solid lubricant friction area of 25-65%. Solid self-lubricating block can work at a high temperature of 280 ℃. But because of its low mechanical strength, carrying capacity is weak, easily deformed, it will be able to insert in a hole in metal tank suppress this disadvantage, it forms part as support for metal, self-lubricating block for lubrication. This self-lubricating bearing lubrication mechanism is in sliding friction with the shaft sleeve in the process of self-lubricating material part of the molecule is transferred to the metal surface of the shaft, filling the small, uneven surface and form a layer of relatively stable solid lubricating film , causing wear between solid lubricant film to prevent the shaft sleeve and adhesive wear. This is a reasonable combination of a combination of copper alloys and non-metallic materials by grinding their complementary advantages, especially for oil-free, high temperature, high load, low speed, anti-fouling, corrosion, strong radiation in the environment movement amplitude, and use the following solution in water or other infiltration impossible to add grease special working conditions.
    2. The self-lubricating block area accounted for more than self-lubricating block accounted for much of the running speed of the surface area of the relevant bearing strength, low speed; large bearing strength, the area occupied by the metal should be larger. The grab ingot Trolley line shaft Chengzi Run slider is about 25% occupied area, pull starter mechanism shaft bearing lubrication to the full, not bearing strength, self-lubricating block occupies an area of about 65%.
    3. The technical requirements for the liner material of the liner should be used in alloys of copper, bushings have a high hardness, are generally required heat treatment, the hardness is not less than HRC45.
    4. Since the geometry and lubrication requirements mosaic blocks. Self-lubricating block has a cylindrical shape and rectangular two kinds of self-lubricating cylindrical can according to the size of the area occupied, on the contrary may be rectangular. Whatever the shape of the inlay must be securely fastened to avoid falling in the operation.
    5. bush and the shaft with the gap value of the coefficient of linear expansion of self-lubricating block is about 10 times stronger than steel. To meet the bearing temperature changes, the gap between the shaft and the bushing from the original metal parts moving with four (D4 / dc4) 0.032 ~ 0.15mm, increased to 0.45 ~ 0.5mm. Self-lubricating block friction liner side protruding metal 0.2 ~ 0.4mm. This will be fully lubricated bearings running at an initial break-in period, reducing the power consumption of power draw.
    6. The non-oil lubricated bearings advantages from:
    a. No less oil lubrication oil lubrication apply to the oil or fuel is difficult to place, it can be used without maintenance or less maintenance.
    b. good wear resistance, low friction, long service life.
    c. have the right amount of elastoplastic, can stress distribution in a wide contact surface, increase the carrying capacity of the bearing.
    d. static and dynamic friction coefficients are similar, can eliminate crawling at low speed, thus ensuring the accuracy of machine operation.
    e. make the machinery to reduce vibration, reduce noise, prevent pollution and improve working conditions.
    f. In the operation process can form a lubricating film, played the role of protecting the shaft, no bite-axis phenomenon.
    g. For low hardness grinding axes, without conditioning the shaft can be used, thereby reducing the associated parts of the process difficult.
    h. thin-walled structure, light weight, can reduce the machine size.
    i. bushing made of brass can be used in corrosive media.
    Aluminum business through a practice, instead casting machine bearing oil-free self-lubricating bearings have been used continuously for 15 months, and is still running, gap between the shaft bushing is generally not more than 1mm, is also expected to re-use 12 months, significantly over the original life (2 months). Oil-free self-lubricating bearings can only get better used in the aluminum ingot casting machine, but can be adapted to oil-free, high temperature, high load, low speed, anti-fouling, corrosion, strong radiation in the environment movement amplitude, as well as in the water equipment or other solution infiltration under impossible to add grease special working conditions, such bearings have a wider promotional value.
    Currently various machinery industry is still used in most of the ball bearings, needle roller and the like, but a small part of the self-lubricating bearings have been used, I believe in the near future from the bearings lubricated bearings will become dominant.
    Here are some application features and advantages of the self-lubricating bearings:
    1. No oil lubrication or less oil lubrication apply to the oil or fuel is difficult to place, it can be used without maintenance or less maintenance.
    2. good wear resistance, low friction, long service life.
    3. Have the right amount of elastoplastic, can stress distribution in a wide contact surface, increase the carrying capacity of the bearing.
    4. The static and dynamic friction coefficients are similar, can eliminate crawling at low speed, thus ensuring the accuracy of machine operation.
    5. make the machinery to reduce vibration, reduce noise, prevent pollution and improve working conditions.
    6. In the operation process can form a lubricating film, played the role of protecting the shaft, no bite-axis phenomenon.
    7. For grinding axes low hardness without quenching of the shaft can be used, thereby reducing the associated parts of the process difficult.
    8. The thin-walled structure, light weight, can reduce the machine size.
    9. The steel plating on the back can be a variety of metals can be used in corrosive media; has been widely used in various mechanical sliding parts, such as: printing presses, textile machines, tobacco machines, micro-motors, automobiles, motorcycles and forestry machinery and many more.