Three Main Factors Of Failure Of Linear Bearing

According to different materials, linear bearings can be divided into metal linear bearings and plastic linear bearings, linear bearings and quenched linear drive shafts are used together. A system of infinite linear motion. Because of the point contact between the load ball and the quenching drive shaft, the load is allowed to be very small, but when moving along a straight line, the friction resistance is small, the precision is high and the moving speed is fast. But in the process of use, it often leads to the failure of linear bearings. What factors will cause the linear bearing to fail? As we know, there are three main factors, as follows.

Wear failure
Wear failure refers to the failure caused by relative sliding friction between surfaces, which leads to the continuous wear of metal on the working surface. IKO linear bearing and continuous wear will gradually damage parts in linear bearing, and eventually lead to loss of dimension accuracy of linear bearing and other related problems. Wear will affect the shape change, increase the fit clearance, change the shape of the working surface, and may affect the lubricant or make the lubricant polluted to a certain extent, which will result in the complete loss of lubrication function, which will lead to the loss of rotation accuracy of linear bearings, or even normal operation.
Wear failure is one of the common failure modes of various bearings. According to the wear form, it can be divided into common wear particles and adhesion wear.
Abrasive wear refers to the wear caused by the invasion of hard particles or hard foreign materials or abrasive particles into the metal surface between the working surfaces of linear bearings and the relative movement of the contact surface, which usually causes plow like scratches on the bearing working surface. Hard particles or foreign matter may come from the inside of the host machine, or other adjacent parts from the host system may be fed into the linear bearing through lubricating medium.
Adhesion wear refers to the uneven stress on the friction surface due to the tiny bulge or foreign matter on the friction surface. When the lubrication condition is seriously deteriorated, the local friction heat will easily lead to local deformation of friction surface and friction micro welding. In severe cases, the metal on the surface may melt locally, and the force on the contact surface will tear the local friction welding joint from the base and increase the plastic deformation. This adhesion tear adhesion cycle constitutes adhesive wear. Generally speaking, slight adhesion wear is called wear, and serious adhesion wear is called occlusion.
Contact fatigue failure
Contact fatigue failure refers to the failure caused by alternating stress on the working surface of linear bearing. Contact fatigue peeling occurs on the working surface of linear bearing, and often accompanied by fatigue crack. First, it occurs at the alternating shear stress under the contact surface, then spreads to the surface, forming different peeling shapes, such as pitting or pitting peeling, and peeling into small flakes, which is called shallow spalling. As the peeling surface expands gradually, it often extends to the deep layer and forms deep spalling. Deep spalling is the fatigue source of contact fatigue failure.
Fracture failure
The main reason of the fracture failure of linear bearing is the defect and overload. When the load applied exceeds the strength limit of the material and causes the part to break, it is called overload fracture. The main reason for overload is sudden failure or improper installation of the main machine. When the impact overload or violent vibration occurs, defects such as microcracks, shrinkage holes, bubbles, large foreign bodies, overheated structures and local burns of bearing parts can also lead to the fracture of the defects, which is called defect fracture.
It should be pointed out that in the manufacturing process, linear bearings can be correctly analyzed by the quality control of raw materials re inspection, forging and heat treatment and the instruments in process control. In the future, it is necessary to strengthen the control. However, in general, the common failure of linear bearing fracture is overload failure. At present, linear bearings are more and more widely used in equipment or special machinery industries, such as electronic equipment, food machinery, packaging machinery, medical machinery, printing machinery, textile machinery, machinery, instruments, robots, tool machinery, CNC machine tools, automobiles and digital three-dimensional positioning and measuring equipment.

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