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Machining process characteristics and process of sintered ndfeb magnet

by:Newland     2020-05-04
Q: the processing technology of sintered ndfeb magnets have characteristics? Sintered ndfeb magnet processing technological process is: the magnet blank - - - - - - - - - - - - - - - - - - - Outer contour finishing - - - - - - - - - - - - - - - - - - - Cutting - - - - - - - - - - - - - - - - - - - Fine grinding - - - - - - - - - - - - - - - - - - - Chamfering - - - - - - - - - - - - - - - - - - - Electroplating - - - - - - - - - - - - - - - - - - - Inspection and testing - - - - - - - - - - - - - - - - - - - The finished magnet outer contour finishing centerless grinding machine is commonly used in ( Cylindrical magnet) Or surface grinding machine ( The square magnet) Finish, make blank magnet has neat outside profile and geometry size of reach regulations; We use diamond cutting jobs in circular slice machine or wire cutting machine, after finishing the blank of the magnet cut into close to finished product shape and size; Fine grinding process is to cut the magnet with a surface grinding machine, double-sided grinding machine or other grinding machine will be the size of the magnet, the requirements of the form tolerance processing to the finished product; Chamfering is plating pretreatment process, to slow in the electroplating process caused by current density relatively concentrated magnet edge coating thickness is not uniform. Because usually finished sintered ndfeb magnet size, shape, so the free rolling finish the whole process is most suitable for the product mass chamfering processing. Free roll grinding the whole technology are: vibrating roller grinding of consolidation, eddy current type roll grinding spindle roller, centrifugal roll grinding the whole, polishing methods such as whole. Among them, the vibrating roller grinding the whole production efficiency is high, the angular velocity is fast, has been widely adapted for use by machining of sintered ndfeb magnet manufacturers. Magnets plating is to form a protective layer of magnet, usually adopt barrel plating process to achieve freedom, for larger size magnets, the plating process. Sintered ndfeb magnets plating depending on the use environment of magnets and cosmetic requirements Ni plating, zinc plating, phosphating, electrophoresis composite plating, alloy plating, etc. Sintered ndfeb magnet surface protective layer in addition to the electroplating, and physical vapor deposition ( 周围性血管疾病) Method, physical vapor deposition and evaporation plating, sputtering, ion plating, can form such as Al, zinc, Cr plating; Chemical vapor deposition ( CVD) Can be formed nitride, carbide coating Ti, Cr, etc. In addition, sintered ndfeb magnet can also use the surface chemical passivation, electroless plating, hot dip, thermal spraying method so as to obtain a variety of different surface protective layer. Inspection and test process is the magnet product appearance, size, form and position tolerances of state, coating corrosion resistance, magnetic testing, such as the indicators of the product.
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