1. Requirements for monitoring rolling bearings using magnetic plugs

(1) Magnetic plugs are only suitable for monitoring critical main bearings that are lubricated with oil and return oil through dedicated pipelines.

(2) The magnetic plug should be installed as close as possible to the monitored main bearing, on the main oil return channel, without any barriers from filters, oil pumps, or other hydraulic components in the middle.

(3) To improve monitoring efficiency, a rotary oil storage container with return oil inlet and outlet can be made. The oil storage container should be made in the shape of an inverted cone, and the magnetic plug should be installed at the bottom of the oil storage container. The inlet of the oil reservoir should be tilted at a certain angle to allow lubricating oil to enter it from the tangential direction. This is beneficial for the separation of abrasive particles from the swirling lubricating oil, which settles at the bottom and enters the magnetic plug through small holes, adsorbing on the end of the magnetic steel.

2. Under normal circumstances, the morphological characteristics of wear and tear particles

During the running in and normal operation periods of rolling bearings, the size of the abrasive particles generated is generally 0.01~0.015mm, mixed with some metal powder. The number of abrasive fragments generated during the running in period of new bearings is higher than that during normal operation. After entering the normal operation period, the number of abrasive fragments and metal powder will significantly decrease. The abrasive fragments appear fine and short in shape under the microscope, with irregular cross-sections.

3. Morphological characteristics of faulty wear abrasive particles

The main failure mode of rolling bearings is fatigue pitting. The size of abrasive fragments formed by rolling fatigue and peeling is generally 0.025-0.05mm, and sometimes there are even larger fragments mixed with some metal powder. The steel ball abrasive fragments of ball bearings usually take the form of roughly circular, radially separated rose petals; The abrasive particles on the raceway present a roughly circular surface broken form; The roller abrasive fragments of roller bearings usually take the form of curled rectangular shapes with a length equal to 2-3 times the width; The abrasive fragments on the raceway generally appear as irregular rectangles.

The basic performance requirements of rolling bearings for materials depend on the working characteristics of the bearings. Generally speaking, imported bearing steel should have the following properties:

1. High contact fatigue strength.

2. High wear resistance.

3. High elastic limit and yield strength.

4. High and uniform hardness.

5. A certain level of impact toughness.

6. Good dimensional stability.

7. Good corrosion inhibition performance

8. Good process performance.

For bearing materials that work under special conditions, they should also have special properties that are suitable for their conditions according to their specific requirements, such as high temperature resistance, low temperature resistance, corrosion resistance, radiation resistance, magnetic resistance, etc.