What are the main failure modes of rolling bearings at normal speeds?

Rolling bearings rarely fail at normal speeds, unless the harsh working conditions in nature will cause the bearing to fail, but if some simple rules are followed, the chance of normal bearing operation can be improved. Approximately 40% of bearing failures are caused by contamination and corrosion of dust, dirt and debris. Contamination is often caused by incorrect use and poor use environment, and it can also cause problems with torque and noise.

Bearing failures caused by environmental and pollution are preventable and can be determined by simple visual observation. Bearings The best way to solve the problem of bearing failure is to avoid failure. This can be achieved by considering key performance characteristics during the selection process.

These characteristics include noise, starting and operating torque, stiffness, non-repetitive oscillation, and radial and axial clearance.

Fatigue peeling and bearing noise. Bearing abnormal sound is often caused by the customer's improper installation, bumps, scratches, etc.; Fatigue spalling is more extensive, and fatigue spalling is generally due to the inclusions in the steel that do not meet the standards, and gradually peels off in the long-term contact cycle, and generally has the raceway surface from the inside to the outside. There is no formula to calculate for fatigue spalling, mainly to improve the cleanliness of the steel and the quality of raceway grinding.

Fatigue damage, permanent deformation.

The main failure modes of rolling bearings: wear, fatigue, corrosion, fracture, indentation, gluing.

In the process of use, the rolling bearing fails or is damaged when its performance indicators do not meet the requirements of use due to many reasons. There are many types of fatigue, mainly contact fatigue for rolling bearings. The causes of fatigue are complex, and there are many influencing factors, including those related to bearing manufacturing.

Failure Identification of Rolling Bearings:

The initial bearing fault diagnosis was based on the use of earsticks, which were judged by hearing. This method is still used today, and some of it has been improved into electronic stethoscopes, and trained people can empirically judge the fatigue peeling that has just occurred, and sometimes even the location of the injury, but after all, there are many influencing factors and the reliability is poor.

Later, various vibrometers appeared, and the root mean square value or peak value of vibration displacement, velocity and acceleration was used to judge whether the bearing was faulty, so as to reduce the dependence of the monitoring personnel on experience, and improve the accuracy of monitoring and diagnosis, but it is still difficult to make timely diagnosis in the early stage of the fault.

The main mode of failure of rolling bearings at normal speed is (c).

a.Excessive plastic deformation.

b.Excessive wear and tear.

c.Fatigue pitting.

d.Glue.

First, the reason for the effectiveness of rolling bearings at general speed

1. The bearing is not installed according to the correct installation method, such as the outer ring of the bearing to transmit force, so that the bearing rolling element and the rolling problem cause small pits, in addition to abnormal noise, the bearing is worn prematurely.

2. When installing the thrust ball bearing and the two-way thrust ball bearing, there is no preloading, and the clearance of the bearing is larger, and when the bearing rotates, due to the action of centrifugal force, the steel ball strives to run in the tangential direction of the edge of the raceway, so that the thrust bearing raceway wears prematurely.

Second, the vibrating plate

1. The vibrating ant bumper hand plate is an auxiliary equipment of automatic assembly machinery, which can discharge various products in an orderly manner, and it can assemble all parts of the product together with automatic assembly equipment to become a complete product.

2. The vibrating plate is powered by a vibrating motor, and the vibrating motor produces a force of directional frequency when working, as long as the vibrating plate is regarded as a kind of inclined plane, and then the physical force analysis of this inclined plane, it is easy to understand its working principle. When the electromagnetic coil of the vibrating disk is working, the inclined plane will have a slight up and down amplitude by electromagnetic attraction, and the working frequency and clearance of the vibration plate can be adjusted to achieve smooth operation.

3. The purpose of the vibrating plate is to automatically and orderly arrange the disordered workpieces to the next process through vibration.

The main failure mode of the rolling brigade positive bearing at normal speed is ()aPlastic deformation.

b.Excessive abrasion.

c.Fatigue pitting.

d.Glue. Correctly answer the case of Zhenfeng: c