A company specializing in the production of heavy duty bearing blocks will explain to you what causes the bearing blocks to fail after mechanical installation

Failure mechanism of bearing pedestal

1. Bearing seat cracking failure Bearing cracking failure strongly advocates that the key causes are two major factors: shortage and overload. When the external load exceeds the material strength limit and constitutes part cracking, it is called overload cracking. The main cause of overload is a sudden defect in the host or improper equipment. Shortages such as microcracks, shrinkage holes, bubbles, large foreign debris, overheating arrangements, and some burns in bearing parts can also cause cracks at the short joints during impact overload or severe vibration, which is called short crack. It should be pointed out that during the manufacturing process of bearings, it is possible to accurately analyze the existence of the above shortcomings through instruments in the factory re inspection of raw materials, casting and thermal degradation punishment quality control, and processing process control. In the future, it is still necessary to strengthen control. However, generally speaking, the most common bearing cracking failures are overload failures.

2. Failure due to clearance modification During operation, due to external or internal factors, the original suitable holes in the bearing seat are modified, resulting in reduced accuracy, and even causing "seizure". This is called clearance modification failure. External factors such as excessive interference, equipment not in place, excessive expansion due to temperature rise, transient overload, and internal factors such as remaining austenite and remaining stress in an unstable state are the main hazards that constitute clearance modification and failure

Contact failure refers to the failure of the shaft treatment surface due to the action of alternating stress. Contact fatigue occurs on the shaft treated male surface, usually accompanied by fatigue cracks, which first occur at the point of high alternating shear stress below the contact surface, and then expand to a different drop pattern on the surface, such as pitting or pitting, and small flakes are called shallow drops. Due to the gradual expansion of the falling surface, it usually extends to the deep layer, forming a deep drop. Deep falling is the source of contact fatigue failure.

4. Loss of wear efficiency Loss of wear efficiency refers to the failure of the metal on the working surface caused by the relative sliding resistance between surfaces. The wear and tear of the bearing will gradually damage the bearing parts, and after all, cause the loss of bearing standard accuracy and other related questions. The wear of the bearing pedestal may affect the modification of the style, the increase of suitable holes and the modification of the working surface description, or it may affect the lubricating oil agent or make it contaminated to a certain extent, resulting in the complete loss of the lubricating oil function, thereby causing the bearing to lose its rotational accuracy and even unable to work properly. Abrasion loss efficiency is one of the common failure methods for various types of bearings. According to wear methods, it can be divided into common abrasive wear and adhesive wear. Abrasive wear refers to the wear caused by the movement of foreign solid particles or hard foreign matter or debris from a metal surface between the shaft treated male surfaces and the contact surface, often forming furrow like scratches on the shaft treated male surface. Hard particles or foreign matter may come from the inside of the host machine or from other adjacent parts of the host system and are fed into the bearing through a lubricating oil intermediary.

Adhesive wear means that the force on the contact surface is uneven due to micro bulges or foreign matters on the contact surface. When the lubricating oil condition is seriously deteriorated, some resistance generates heat, which is easy to form some deformation and resistance micro welding appearance on the contact surface. In serious cases, the surface metal may melt, and the force on the contact surface will tear some resistance welding points from the substrate, increasing the plastic deformation. This cycle of adhesion, tearing, and adhesion constitutes adhesive wear. Generally speaking, fine adhesive wear is referred to as abrasion, and severe adhesive wear is referred to as occlusion.