Now the market pressure of strong magnet sales competition is getting bigger every year, many manufacturers of magnets in order to achieve a better competitive advantage in the market, choose to use poorer quality raw materials to reduce costs. So we must know how to distinguish the quality of strong magnets when buying strong magnets, so that we can buy better quality strong magnets.
The quality of strong magnets is judged from two aspects:
(1) product performance.
(2) product appearance.
Strong magnets performance:
strong magnets have uniform standards, of course, provided that the products produced by the regular manufacturers, when distinguishing the need to examine the relevant parameters of strong magnets, such as: magnetic energy product, coercivity, remanent magnetism and other related performance. The conventional measurement method is different sizes of strong magnets using Gauss meter or flux table to distinguish the magnetic energy product of strong magnets, and more professional need to use the static magnetic properties of the tester. The appearance of strong magnets.
The appearance of strong magnets inspection mainly includes five categories:
1. magnet magnet appearance there are no scratches (including scratches, line marks, knife marks, etc.
2. magnet surface there are no pockmarks (including pockmarks, pockmarks, bubbles, scars, slag layer, partial over-thickness, plating tumor.
3. magnet surface there are no cracks (including cracks, cracks, etc.
4. magnet surface there is no knock edge (including knock edge, chipped edge, material residue.
5. Whether there is any sand eye on the magnet surface (including sand eye, air hole, pin hole, particle, etc.
In general, it is to see whether the magnet has missing edge and corner, whether the plating layer is intact, and whether the size meets the design requirements; NdFeB generally has plating layer to protect it from corrosion and rusting. In general, the magnets with the same specifications can be placed on a plane that can be adsorbed by hand to identify the magnitude of magnetic force.