2019-08-09 14:17:35

NdFeB Magnets Classification and Characteristics

NdFeB magnets can be divided into bonded NdFeB magnets and sintered NdFeB magnets.

Bonding is actually injection moulding, while sintering is formed by vacuum and high temperature heating!

NdFeB magnet is the most powerful permanent magnet at present. Material grade N35 < N52, various shapes can be processed according to specific requirements: round, square, drilling, magnetic tile, magnetic rod, convex, ladder, etc. Despite these advantages, the surface is easy to rust, generally need to do some protective surface treatment: nickel plating, zinc plating, gold plating, epoxy resin, etc. The applicable ambient temperature of ordinary NdFeB magnets is below 80 degrees, but some NdFeB magnets can withstand 200 degrees. Mainly used in electronics, electrical appliances, packaging, motors, toys, leather, automotive machinery and so on.

 

Major Materials for Production of NdFeB magnets

The main raw materials for producing NdFeB magnets are rare earth materials such as neodymium, praseodymium, pure iron, aluminium and ferroboron alloys.

 

Production Technology of NdFeB Magnets

 

Generally speaking, the production process of NdFeB magnets is to mix and melt the materials, and then break the refined metal blocks into small particles. Put small particles into the die and press into shape. Then sinter. Sintering is blank. The shape is usually square or cylindrical. For example, the general size concentrates on the length and width of 2 inches, and the thickness is less than 1.5 inches. The thickness is the direction of magnetization (high performance magnets are oriented, so they have the direction of magnetization). Then, according to the actual needs, the billet is cut into the required size and shape. Cutting magnet, chamfering, cleaning, electroplating, magnetization, can be.

 

Processing technology of NdFeB:

There are basically two kinds: cutting machine and wire cutting.

Cutting machine is a kind of diamond inner hole cutting blade with thickness of about 0.3 mm. According to the requirements, the magnet is cut into the required size. But this method only applies to simple square and cylindrical shapes. Because the inner hole is cut, the size of the magnet can not be too large, otherwise it can not be put into the blade.

 

Another method is wire cutting. Generally used for cutting ceramic tiles and large-scale products.

 

Drilling: Small holes are usually drilled with a vibrating diamond bit. Large holes, using sleeve holes, can save material costs.

 

Dimensional Accuracy of NdFeB Products

The dimensional accuracy of NdFeB products is about (+/-) 0.05 mm, which is more economical. In fact, the existing processing methods can achieve (-) 0.01 accuracy. However, NdFeB usually needs to be electroplated, so it needs to be cleaned before electroplating. The corrosion resistance of this material is very poor, and the dimensional accuracy will be cleaned out during the pickling process. Therefore, the accuracy of real electroplating products can not reach the level of pure cutting and grinding.

 

Where can I buy NdFeB magnets?

In fact, it's easy to find NdFeB manufacturers on the Internet, small ones, and then say what kind of products you want to produce, which is thousands or tens of thousands of months. Buy a few samples to test performance. If you put it in the right place and the product is relatively ordinary, you can basically get free samples. Or not expensive. Big manufacturer, don't look for it. People basically ignore you.

 

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