The reason engraving machine to produce motor bearings rust is very complex and may be imported bearings rust handled properly, it could be caused by corrosion of moisture and corrosion caused by the mist. Here I told you explain it in detail.
Insulating paint out of the volatile acid ingredient used in most motor plant, there are four:
① paint material of low molecular weight unreacted acid component (the anhydrous iso-phthalic and terephthalic acid, anhydrous maleic acid, fumaric acid).
② paint curing acid component generated (when denatured with phenolic paint, formaldehyde water into formic acid).
③ thermal or oxidative decomposition of lower fatty acids (formic acid, acetic acid).
④ the cured lacquer acid component decomposition of the water. The main acid component is produced by formic acid varnish, a close relationship between the occurrence of the amount of formic acid and the extent of corrosion occurring.
Grease paint adsorbed acidic components volatilize, causing deterioration of the grease, and such acidic components and promote the hydrolysis of fat, resulting in concentration of the acidic component increases, causing the bearing corrosion.
Grease the working principle is the use of internal and external fat layer ball raceway separated by oil viscosity characteristics, dependent on the ball and raceway surface, separated the ball rolling with the internal and external metal interface tract, reducing the metal surface wear and protect the metal from corrosion of air and moisture, reduce vibration and noise, the bearing can smooth rotation.
But the grease deterioration, the viscosity will change, the film broke through, grease separation function and adhesion properties will disappear, the consequences produced.
First, make insulating paint acidic components produced by direct oxidation of metal surfaces, causing the bearing corrosion.
Second, causing the ball inside and outside the raceway direct touch, wear occurs when rotated, causing noise increases.
