NSK bearing import common cause failure and use the matters needing attention

Bearing failure situations, there are a lot of a lot of users of bearing are seen in this kind of situation. Bearing in operation after a period of time, you should check if there is any problem, pay special attention to whether the bearing failure. Usually failure reason mainly has the following: 1. Contact fatigue failure NSK import bearings working surface contact fatigue failure is caused by the effect of alternating stress and failure. Contact fatigue spalling appeared in bearing working surface, often accompanied by fatigue crack, first of all, from the maximum cyclic shear stress under contact surface, and then extended to form a different flake shape, such as dot to pitting corrosion or pitting spalling, peel into small sheet according to the shallow flaking. Because spalling surface expands gradually, and often to deep extension, forming deep spalling. Deep spalling is contact fatigue failure of fatigue source. 2. Wear failure wear failure refers to the relative sliding friction between the surface to cause its work surface metal wear and failure. NSK import bearing parts gradually continue to wear will cause damage, and eventually cause bearing size accuracy loss and other related issues. Wear may affect the shape change, the increase of fit clearance and working surface shape change, may affect the lubricant or make its pollution to a certain degree of lubrication function is lost, and even lose bearing rotating precision will not operate properly. Wear failure is one of the common failure modes of all kinds of bearings, according to the wear and tear form general it can be divided into one of the most common of abrasive wear and adhesive wear. Abrasive wear is refers to the bearing between the work surface into the external hard hard foreign body or abrasive dust on the surface of the metal particles or relative movement and the contact surface and the wear and tear, often working in the bearing surface furrow of the damage. Hard particles or other foreign body may come from inside the host, or from the host system adjacent parts sent by lubricating medium bearing inside. Adhesive wear refers to the slight bulge because of the friction surface or foreign bodies make the friction surface is uneven, when lubrication conditions worse, due to the local friction heat production, easy to cause the friction surface phenomena, local small welding deformation and friction serious when the surface of the metal may be the partial melting, contact surface forces from the local friction welding points on the matrix will be torn and increase the plastic deformation. This kind of adhesive - — Tear - — Adhesive cycle constitutes the adhesive wear, generally speaking, the mild adhesive wear is called a scratch, serious adhesive wear called occlusion. 3. NSK import bearing failure of failure of the main reason are the two major defects and overload. When fracture loads more than material strength limit and cause parts called overload fracture. Overload reason mainly is the main engine failure or improper installation. Bearing parts of micro crack, shrinkage cavity, bubbles and large foreign impurities, overheating organizations and local burns and other defects during the impact overload or violent vibration at will, in the defect lead to fracture, referred to as a defect fracture. It should be noted that the bearing in the process of manufacturing, for raw materials into the factory reinspection, forging and heat treatment quality control, process control by correct analysis instrument is, this still must strengthen control in the future. But generally speaking, most for overload failure of bearing failure. 4. NSK bearing import clearance change failure at work, because of the effect of external or internal reasons, change the original fit clearance, lower accuracy, even cause failure 'killed' called clearance changes. External reasons such as interference, large amount of installation does not reach the designated position, temperature rise caused by expansion, instantaneous overload, etc. , internal causes such as residual austenite and the residual stress in a state of flux and so on all is the main reason for the failure caused by clearance changes. A, use when installation should careful not allowed powerful punch, bad phenomenon in a motor bearing solutions are not allowed to use hammer percussion bearing directly, not allowed by transfer roller pressure. 2, using appropriate and accurate installation tools use a special tool, as far as possible to avoid use cloth class and short fiber, things like that. Three NSK import bearings and the surrounding environment, try to keep clean motor bearings commonly used sodium base grease dust into the bearing even invisible to the naked eye smile, also can increase the bearing wear, vibration and noise. Four, to prevent rusting of NSK bearing imported directly by hand take bearing, to fully wash hands sweat, and again after coated with high quality mineral oils, especially in the rainy season and summer to pay attention to rust. In some special operating conditions, bearing can get more than the life of the traditional computing, especially in the case of light load. Bearing box of labyrinth seal mechanism and influence factors analysis of the specific operating conditions is, when the rolling surface ( Track and rolling piece) Can be separated by a lubricating oil film effectively and the surface of the limit of pollutants may cause damage.