Linear bearing according to different materials can be divided into: linear bearings, linear bearings and plastic metal linear bearing is used with quenching line shaft. For infinite linear motion system. Load ball and quenching shaft because it is a point contact, the allowable load is small, but the linear motion, the minimum friction resistance, high precision, quick movement. But in the process of using, often lead to linear bearing failure, this is how to return a responsibility? Specific reasons about the details below.
Linear bearing failure of the three main reasons:
1, the wear failure
Refers to the relative sliding friction between the surface abrasion failure lead to constant wear and tear of the working surface of the metal and the failure. IKO linear bearing, continuous wear will cause damage of linear bearing parts gradually, and ultimately lead to linear bearing size accuracy loss and other related problems. Wear may affect the shape change, the increase of fit clearance and working surface morphology change, may affect the lubricant or make its pollution to a certain degree of lubrication function is lost, so that loss of linear bearing rotating accuracy and will not operate properly. Wear failure is one of the common failure modes of all kinds of bearings, according to the wear and tear is usually divided into one of the most common form of abrasive wear and adhesive wear. Between abrasive wear refers to the linear bearing working 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 caused by wear and tear, often cause furrow of abrasion in bearings working surface. Hard particles or foreign bodies may come from inside the host or other adjacent parts by lubricating medium from the host system into linear bearing internal. Linear bearing accuracy of related knowledge. Adhesive wear refers to the because of the friction surface microscopic bumps or foreign bodies make the friction surface is uneven, serious deterioration, the condition of lubrication for local friction heat production, easy to cause local deformation and friction surface friction welded phenomenon, 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, tearing, adhesive cycle constitutes the adhesive wear and tear, in general, mild adhesive wear is called a scratch, serious adhesive wear called occlusion.
2, contact fatigue failure
Contact fatigue failure refers to the linear bearing working surface under the role of alternating stress and failure. Contact fatigue spalling occurred in linear 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. Due to spalling surface expands gradually, and often to deep extension, forming deep spalling. Deep spalling is contact fatigue failure of fatigue source.
3, the fracture failure
Linear bearing failure of the main reason is that defects and overload two factors. When the loads more than material strength limit fracture caused by 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 will cause fracture in defect, known as defect fracture. It should be pointed out that linear bearing in the process of manufacturing, for raw materials into the factory reinspection, forging and heat treatment quality control, process control through instrument analysis of the existence of the above defects and correct still must strengthen control in the future. But in general, usually linear bearing fracture failure of most for overload failure.
At present, the linear bearing has been widely applied to electronic equipment, food machinery, packaging machinery, medical machinery, printing machinery, textile machinery, machinery, instrument, robots, machine tools, CNC machine tools, automobile and digital 3 d coordinate measuring equipment such as precision equipment or special machinery industry.
