Crossed roller bearing is a special type bearing with the separable inner ring and rotating outer ring. Its special structure can achieve high-precision rotation movement, so it is widely used. Now it is widely used in industrial robots, usually as joint bearings of industrial robots. Crossed roller bearings also need to be protected when they are in operation so that they can be used for a longer period of time. However, during operating, the bearing cage sometimes breaks, so what is the reason for the break?
1. Abnormal load
When the cage has problems during installation, such as improper installation, tilting, excessive interference, etc., it is easier to reduce the clearance, which intensifies friction and heat during use, softens the surface, and causes premature abnormalities. And, as the peeling expands, the peeled foreign matter enters the cage pockets, causing the cage to block operation and generate additional loads, which aggravates the wear of the cage. Such a deteriorating cyclic effect may cause the cage to break and become scrap.
2. Lubrication is not enough
When the bearing is in operation, if the lubrication is not done well, it will affect the normal operation. Therefore, it is necessary to ensure that the lubricating oil is sufficient and enough for the use of the bearing. If the lubricating oil is not enough, then the crossed roller bearing will be poor. The state of oil, will make it easier to form occlusal wear, which will worsen the condition of the working surface, so that the tears from the occlusal wear will enter the cage and cause abnormal load on the cage. This may cause the cage to break.
3. Foreign matter invasion
In fact, the intuitive reason for the cage fracture is that foreign matter enters the cage. Once the foreign matter enters, it will affect the operation of the cage, especially some hard foreign matter, which will aggravate the wear of the cage and generate abnormal additional load. This may cause the cage to break.
4 Creep phenomenon
The creep phenomenon is also one of the reasons for cage fracture. In the so-called creeping multi-finger ferrule sliding phenomenon, when the interference of the mating surface is insufficient, the load point moves to the surrounding direction due to the sliding, and the ferrule deviates from the shaft or the housing in the circumferential direction. Once creep occurs, the mating surface is significantly worn, and the wear powder may enter the inside of the cross roller bearing, forming abnormal wear, raceway peeling, cage wear, and additional load process, and may even cause cage fracture.
5 Cage quality
The quality problem of the cage also affects its use. If the quality is very poor, it may break when it encounters wear and tear during use. Especially when the cage is defective, it is more likely to break. Defects include cracks, large dissimilar metal inclusions, shrinkage holes, bubbles, or riveting defects, lack of nails, pad nails or gaps in the joint surface of the two cage halves, severe riveting, etc., these conditions may cause the cage to break.
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