The bearing is faulty, so you can do it.

1. The failure mechanism of the bearing.

Bearings are common in most mechanical equipment, have a high usage rate, and also have a high damage rate. Bearings have a good starting performance, high reliability, and easy maintenance. Many of them are widely used in mechanical equipment. When the equipment is in the state of constant speed, the bearing has a high bearing capacity, and the long-term force acts, resulting in the bearing being more prone to failure than other parts, and the bearing fault occupies a large proportion in various types of mechanical failure.

In comparison, the rolling bearing has larger radial dimension than the sliding bearing and the damping capacity is relatively poor. The rolling bearing has a lower life than the sliding bearing and the noise is higher than that of the sliding bearing. The main function of the radial bearing is to withstand. The radial force consists of four parts, namely the inner and outer rings, the rolling elements and the rolling body cage. The inner ring is tightly fitted over the journal and rotates synchronously with the shaft, while the outer ring is in the housing bore. When the inner and outer rings are relatively rotated, the rolling elements roll on the inner circumference of the inner circumference and the inner circumference of the outer circumference to prevent the friction cage from separating the two. In most cases, there are problems with the bearing, mainly due to loose parts such as the sealing sleeve and the fixing bolt during operation, causing wear of the rolling element and the rolling element cage, or gaps in the bearing gland, bushing, etc., water or Impurities such as dust and dust entering the bearing housing from these gaps become dirty and cause poor lubrication, eventually leading to bearing failure.

2. Damage to the bearing.
Under normal conditions, the bearings can be used until the fatigue life as long as they are used normally. Early damage to bearings that are not durable, prematurely damaged, and fatigue life is called a bearing failure. The reason for this is that the bearing failure is generally caused by the lubrication of the bearing during installation or use, resulting in foreign matter intrusion from the outside, or poor lubrication caused by the thermal influence of the bearing housing, thereby premature failure.

3. Common faults in bearings.
(1). The bearing is discolored. When the bearing is running at a high temperature, it will produce black or blue. The main reason for the discoloration of the bearing is that the lubrication in the bearing does not meet the technical requirements; the dirt or impurities are invaded during the installation of the bearing; the cooperation between the bearing and the journal and the shaft hole is loose, resulting in sliding friction between the inner and outer rings of the bearing; The difference between the journals causes the bearing to be abnormally operated; the bearing is operated by its own design due to overspeed or overload operation; the axial clearance of the circular roller bearing is smaller. Bearings and seals, washers and linings The sleeves and the like produce a large friction.

(2). Cracks appear in the inner and outer rings of the bearing. On the inner and outer rings of the bearing, cracks of different degrees are generated, mainly due to defects in the bearing quality or defects in the steel used in the bearing; the bearing is subjected to a large external impact load; when the bearing is installed and disassembled, the bearing Directly hit by the iron, causing the inner ring and the outer ring of the bearing to crack; the inner ring and the outer ring of the bearing and the seat hole and the journal are poorly matched, resulting in uneven bearing force on the raceway and cracks on the inner ring and the outer ring.
(3). Bearing corrosion. The seal of the bearing fails, causing external dirt or moisture to enter the bearing, causing corrosion of the bearing.
(4). Ball or roller is broken. Due to the small installation clearance of the bearing balls or rollers, the bearing is subjected to severe impact and the lubricant is mixed with hard materials such as iron filings, causing the balls or rollers to break.
(5). The raceway has pits. The bearing is subjected to a strong external impact load or due to poor lubrication, resulting in the raceway exceeding the force design standard and causing potholes.
(6) Bearing rotation is laborious. The running speed of the bearing is slow, and it can't be rotated or rotated by hand. This is mainly because the bearing is not cleaned, the matching hole of the bearing journal, inner ring or outer ring is too small, resulting in bearing deformation or large force, which ultimately leads to It is laborious to operate.