How to look at a quality KOYO bearings

KOYO bearing surface contact fatigue failure modes, abrasive wear, adhesive wear and corrosive wear, they always occur in KOYO bearing surface and a surface layer, the surface layer is obviously the quality of the work KOYO the reliability and service life of the bearing vital.
   KOYO bearing surface quality studies include: surface topography analysis; surface material and surface modification layer analysis; surface stress state analysis; surface state of wear and corrosion state analysis and so on.
   Due to cold, heat processing conditions and other factors lubricating medium, KOYO bearing surface microstructure, physical, chemical and mechanical properties and their hearts are often very different from the Ministry. KOYO bearing surface microstructure, physical, chemical and mechanical properties of the surface layer changes called surface modification layer. If the surface is altered layer caused by the grinding process is called grinding surface metamorphic layer. KOYO bearing surface KOYO bearing metamorphic layer surface quality analysis is the main component analysis, of course, KOYO bearing failure analysis is one important part.
   A first look at the use of bearing steel material, Japan KOYO bearings is their own professional steelworks produced, both in terms of hardness and precision than fake KOYO bearings.
2 marking equipment with high inputs, in order to establish a brand image, prevent product counterfeiting, KOYO bearings manufacturers use a laser marking machine, hoping to establish a corporate image, with international standards at the same time, with the high input to control the products are fake, however, Since using a computer controlled laser marking machine, marking the font, size and other advantages of easy editing, not only can effectively prevent counterfeiting, but to increase the difficulty of counterfeiters.
Three observation. With the naked eye rolling KOYO bearings, inner and outer raceway spalling should be no traces and severe wear, and was an arc-shaped groove; all rolling surface should be no spots, cracks and peeling phenomenon; cage should not be loose, no damage, not worn out, but the big gap with the rolling elements.
4 hand method. Normal KOYO Taper bearing inner and outer races and rolling gap of 0.005 to 0.010 mm. Have used a stage for rolling KOYO bearings, inner ring with your fingers axial shaking, there should be no obvious clattering.
5 Turn the Act. With one hand holding KOYO bearing inner race, the other hand turning outer race, KOYO bearings should be flexible rotation, and should not feel the radial shaking.
6 Of course, the price depends on the price is much lower than normal if there might be a fake recommended not to buy, after all, really, after all, you pay for the high cost of imports so expensive.