Failure phenomenon of powder metallurgy oil bearing

The oil-impregnated bearing is made of metal powder and other anti-friction materials, which are pressed, sintered, shaped and oil-impregnated. It has a porous structure. After being infiltrated in hot oil, the pores are filled with lubricating oil, and the working is due to the rotation of the journal. The action and friction heat cause the metal and oil to expand by heat, and the oil is squeezed out of the pores, and the friction surface acts as a lubrication. After the bearing is cooled, the oil is sucked back into the pores.

When the product is put into use for a while, there will be some problems with the failure. In fact, this has an inseparable relationship with the quality of the product, but it may not always be caused by quality problems, or it may be caused by improper operation or different operating methods. We summarize some of the problems that arise when using powder metallurgy oil-impregnated bearings.

The most common problem in powder metallurgy oil-bearing bearings is the problem of tile surface corrosion. It can be found by spectral analysis that the concentration of non-ferrous metal elements is high, and there is more non-ferrous metal cost in the element spectrum, or water or acid in lubricating oil. Excessive values ​​can cause this corrosion problem.

There is also a certain degree of pull-up and corrosion on the shaft diameter surface of the powder metallurgy oil-impregnated bearing, which is also due to the presence of all the cutting abrasive grains in the interior. The composition of the abrasive grains is mainly non-ferrous metals. If a certain amount of fretting wear is found on the back of the tile, it may be that the iron concentration is abnormal, and there are more sub-micron wear particles of iron composition.

Through analysis and summary, we can obtain the cause of the fault according to the problem of powder metallurgy oil bearing bearing problems, and develop effective and effective correction scheme to ensure the effective service life of the product.
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Wood shredder equipment bearing replacement steps

1. Loosen the bolts that secure the bearing housing and remove the bearing from the shaft together with the housing. Note that before the bearing seat at one end of the shaft is removed, the bearing bolts at the other end of the shaft should be loosened to prevent the bearings at both ends from being damaged by each other.

2. First loosen the locking screw on the eccentric sleeve of the bearing with an Allen key, then insert the small iron rod into the counterbore on the eccentric sleeve of the top cover, and loosen the eccentric sleeve against the rotation direction of the shaft.

3. Install the eccentric sleeve. First, eccentric sleeve is placed on the eccentric step of the inner sleeve of the bearing, and the hand is tightened by the direction of rotation of the shaft. Then the small iron rod is inserted or pressed against the counterbore on the eccentric sleeve. Tap the small iron bar with the hammer in the direction of the shaft. Make the eccentric sleeve securely fast, and finally lock the hexagon socket head cap on the eccentric sleeve.

4. Do not tighten the bolts of the fixed bearing housing, so that the bearing housing can rotate in the bearing housing. Then fasten the bearing block bolts. Also install the other end bearing and seat on the same shaft, turn the shaft a few turns, and let the bearing itself automatically find the position.

5. Apply lubricant to the mating surface of the crusher housing and the bearing, and install the bearing into the bearing housing. The assembled bearing is then placed over the shaft with the NSK bearing housing. Push it to the desired position for installation.

6. Before installing the imported bearing on the shaft, the fixing pin of the bearing shell must be unplugged, and the surface of the journal should be polished and cleaned, and the oil is rust-proof and lubricated at the journal.
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Crossed roller bearing

The characteristics of the crossed roller bearing: the crossed roller bearing, the cylindrical roller or the tapered roller is arranged perpendicularly to each other through the spacer block on the 90-degree V-shaped groove rolling surface, so the crossed roller bearing can bear the radial direction Multi-directional loads such as load, axial load and moment load. The size of the inner and outer rings is miniaturized, and the extremely thin form is a small size close to the limit, and has high rigidity and accuracy to the P5, P4, and P2 levels. Therefore, it is suitable for joints and rotating parts of industrial robots, rotary tables for machining centers, precision rotary tables, medical equipment, calculators, military, and IC manufacturing equipment.

1, with excellent rotation accuracy:

The internal structure of the crossed roller bearing is arranged at 90° perpendicular to each other by rollers. The spacers or spacers are arranged between the rollers, which can prevent the inclined rollers of the rollers from being mutually inspected and effectively prevent the rotational torque. Increase. In addition, the contact phenomenon or the locking phenomenon of the roller does not occur; at the same time, since the inner and outer rings are divided structures, the gap can be adjusted, and even if the preload is applied, a high-precision rotary motion can be obtained.

2. Operational installation is simplified:

The outer ring or inner ring that is divided into two parts is fixed together after the roller and the retainer are loaded, so the operation is very simple to install.

3. Withstand large axial and radial loads:

Because the rollers are vertically aligned with each other through the spacers on the 90° V-groove rolling surface, this design allows the crossed roller bearings to withstand large radial loads, axial loads and moment loads. Directional load.

4, greatly save installation space:

The size of the inner and outer rings of the crossed roller bearing is miniaturized to a minimum. In particular, the ultra-thin structure is a small size close to the limit and has high rigidity, so it is most suitable for the rotation of the joint portion or the rotating portion of the industrial robot and the machining center. A wide range of applications such as work tables, robot rotating parts, precision rotary tables, medical instruments, measuring instruments, and IC manufacturing equipment.
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How to grasp the best time for bearing oil change

Affirmative answers are not acceptable as to whether the grease can be used indefinitely. Because of the excessive use of grease, it is a lot of damage to the bearing.

Grease has a good effect on the bearing. It has good adhesion, wear resistance, temperature resistance, rust resistance and lubricity. It can improve high temperature oxidation resistance, delay aging, dissolve carbon deposits and prevent metal abrasion. Condensation with oil to improve the wear resistance, pressure resistance and corrosion resistance of the machine.

However, the more the grease is filled, the greater the friction torque. With the same filling amount, the friction torque of the sealed bearing is larger than that of the open bearing. After the grease filling amount is equivalent to 60% of the internal space of the bearing, the friction torque is no longer significantly increased. This is because most of the grease in the open bearing has been extruded, and the grease in the sealed bearing has also been lost.

As the filling amount of the grease increases, the temperature rise of the bearing increases linearly, and the same filling amount, the temperature rise of the sealed bearing is higher than that of the open bearing. It is generally believed that the grease filling capacity of sealed rolling bearings should not exceed 50% of the internal space.

In general, the lubrication plan for bearings is based on time. Equipment suppliers typically develop lubrication plans based on operating time. Bearing Master WeChat: 2966884113 and equipment suppliers often add guidance on the amount of lubricant during their maintenance planning. For the staff, short-term lubricant replacement is very common, and often more grease is added.

For lubricated bearings, there is a fixed concept of prevention that keeps the equipment operating properly without the bearings being shut down due to drying and collapse. However, we have to balance the need to maintain lubrication and hunger and a lot of over-lubrication. If the oil change is too small, the bearing will be scrapped in advance; if the oil is changed too much, the bearing will be in trouble or damage the power coil and coiling wire for a long time.
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