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NSK imported bearings common causes of failure and application of matters
Source: China Bearing Network Time: 2014-06-15
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1. Touch fatigue failure Touch fatigue failure refers to the failure of the NSK imported bearing work subject to the effect of alternating stress. Touch fatigue is present on the bearing work appearance; usually accompanied by fatigue crack; firstly from the touch surface below the maximum alternating shear stress Occurs; then expands to the outer surface to form a different shape of the shedding; if the point is pitting or pitting, the shallow part of the surface is broken off. Due to the gradual expansion of the exfoliated surface, it tends to expand deeper; Deep detachment. Deep detachment is the source of fatigue that touches fatigue failure.
2. Wear and failure Wear and tear refers to the failure of the relative sliding between the external surfaces to cause the wear and tear of the working exterior metal. The continued wear will lead to the gradual damage of the NSK imported bearing parts; and the end of the bearing scale accuracy loss and other related problems. Wear It can affect the shape modification; the cooperation gap is increased and the shape of the work is changed; it can affect the smoothing agent or cause the pollution to reach a certain extent and cause the smooth function to be completely lost; thus, the bearing loses the rotation precision and can not work normally. The wear failure is One of the common failure modes of bearing type; usually the most common abrasive wear and adhesive wear can be divided according to the wear mode.
Abrasive wear refers to the wear of foreign solid particles or hard foreign objects or metal surface between the outer surface of the bearing operation and the relative movement of the touch surface; often the furrow-like damage is formed on the outer surface of the bearing work. Hard particles or The foreign matter can come from the inside of the host or from other adjacent parts of the host system and is fed into the bearing by the smooth medium. Adhesive wear refers to the uneven force of the conflict surface due to the slender protrusion or foreign matter in the conflicting appearance; when the smooth condition is severely deteriorated; Partial conflict heat generation; simple formation of conflict surface deformation and conflict fine welding surface; the surface metal can be partially melted when severe; the touch surface effect force tears part of the conflict solder joint from the substrate to increase plastic deformation. The process of tearing adhesion constitutes adhesive wear; in general; fine adhesive wear is called scratch; severe adhesive wear is called bite.
3. Cracking failure NSK imported bearing cracking failure is the primary cause of shortcomings and overload. When the applied load exceeds the data strength limit and the part cracking is called overload cracking. The overload is caused by the host's sudden fault or the device is not proper. Cracks, shrinkage cavities, air bubbles, large foreign objects, overheating arrangements and partial burns will also cause cracking in the shortcomings during impact overload or severe oscillation; it is called fault cracking. It should be paid attention to; the bearing is in the process of production; The original data re-inspection, casting and heat treatment quality control, processing process control can be correctly analyzed by the instrument. The above shortcomings are not present; in the future, it is necessary to strengthen the control. But in general; usually the bearing cracking failure is mostly overloaded. Invalid.
4. NSK imported bearings are in operation; due to the influence of external or connotation reasons; the original cooperation gap is changed; the accuracy is reduced; and even the formation of "biting death" is called the clearance modification failure. The external reason is too large; The device is not in place; the temperature rise causes a large amount of expansion, instantaneous overload, etc.; Professor pointed out that the connotation reasons such as residual austenite and residual stress are unstable, which are the primary reasons for the failure of the play change.
First, the use of the device should be carefully and carefully not allowed to force the stamping; the motor bearing presents a poor representation solution does not allow the hammer to directly hit the bearing; does not allow the pressure to pass through the roll.
Second, use appropriate and precise devices to try to use special things; try to avoid the use of cloth and short fibers and the like.
Third, try to adhere to the NSK imported bearings and the surrounding environment of the sanitary motor bearings usually use sodium-based smooth grease even if the invisible shallow dust into the bearing; will also add bearing wear; oscillation and noise.
Fourth, to avoid the rust of NSK imported bearings directly when taking the bearing by hand; to wash away the sweat on the hands; and apply high-quality mineral oil before operation; especially in the dry season and summer to pay attention to rust. In some kind Under special operating conditions; the bearing can obtain the lifespan better than the traditional accounting; especially in the case of light load. The mechanism and influence factors of the bearing box labyrinth seal are analyzed. These special operating conditions are; when the rolling surface (track and roll) Piece) is effectively separated by a smooth oil film and constrains the appearance of contaminants.
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