Sintering Nd-Fe-B magnet deep processing technology characteristics and processes

- Nov 03, 2017 -

What are the characteristics of sintered Nd-Fe-B magnets deep processing?

Sintered Nd-Fe-B magnet deep processing process is:

Magnet blanks ---- contour finishing ---- cutting ---- fine grinding ---- chamfer ---- plating ---- inspection and testing ---- Finishing the outer contour of the magnet General centerless grinding machine (cylindrical magnet) or surface grinder (square magnet) to complete, so that the blank magnets with a regular outer contour and reach the required geometric size;

The cutting process is to use a diamond internal slicing machine or wire cutting machine, the finished blank magnet is cut into close to the finished product


Shape and size

Grinding process is to cut a good magnet with a surface grinder, double grinder or other grinder magnet size, form tolerance processing to the requirements of the finished product;

Chamfering is a pretreatment process before plating, in order to slow the uneven thickness of the coating caused by the relative concentration of the current edges in the magnet edge during the electroplating process. Since the conventional sintered Nd-Fe-B finished magnets are small in size and shape, the free-wheeling finishing process is most suitable for high-volume chamfering of the product. Free barreling finishing technology are: vibrating barrels, eddy current barrels, centrifugal barrels, roller barrels, etc. a variety of ways. Among them, the vibrating barrel polishing production efficiency, chamfering speed, has been widely sintered sintered Nd-Fe-B magnets used by manufacturers;

Electroplating is to form a protective layer on the magnet surface of the magnet, usually free roller plating process to achieve, for larger magnets, the use of hanging plating process. Sintered Nd-Fe-B magnet plating magnet as the use of the environment and the appearance of sub-plating Ni, Zn, phosphating, electrophoresis, alloy plating, composite plating and so on.

Sintered Nd-Fe-B magnet surface protection layer in addition to plating, there are physical vapor deposition (PVD) method, physical vapor deposition is divided into evaporation, sputtering, ion plating three categories, can form Al, Zn, Cr, etc. Plating; chemical vapor deposition (CVD) can form Ti, Cr and other nitride, carbide coating. In addition, neodymium magnets can also be surface chemical passivation, electroless plating, hot dipping, thermal spraying and other methods to obtain a variety of surface protective layer.

Testing, testing process is the size of the finished magnet and the form of tolerances, the appearance of state, coating corrosion resistance, magnetic properties and other product specifications for testing.

Article from NdFeB Industry Network

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