Nd-Fe-B permanent magnet material production of process

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Raw materials — Melting — Jet Milling — Pressing — Sintering — Quality Control(STEP 1) — Grinding — Quality Control(STEP 2) — Cutting — Quality Control(STEP 3) — Coating — Inspecting — Quality Control(STEP 4) — Magnetizing — Packaging — QC Passed.

1.According to the recipe ingredients and the proportion of raw material weighed precisely, bias control :± 1g;

2. In accordance with the melting point of the raw materials, put them in a proper sequence,ensuring the vacuum condition and control power.While even casting, insert Ar gas protection and cooling in the right way. (High Vacuum Induction Melting Furnace);

3.Under the atmosphere of N2 protection, crush the steel ingot. (Coarse Crusher, Intermediate Crusher);

4. After the crushing, then deliver to the jet milling machine to make powder.(Jet Milling Machine );

5.Add the protective agent and mix up with the powder. Use the press machine to press mold according to the customer’s requirements.( 3D Motion Mixer ,Floating Magnetic Field Press );
6.To improve the the density and quality,the workblank should get the isostatic pressing forming.(Cold Isostatic Press );

7.Put the press-forming workblank material into the vacuum sintering furnace, set the temperature according to the product properties.The sintered product have to get the generally secondary tempering,first level of tempering temperature is about 900 ℃，the secondary tempering temperature at about 500 ℃.(Vacuum Sintering Furnace);

8.After the process of sintering and processing for the workblank , first get through the visual inspection to check the surface is oxidized, deformation and the shrinkage is normal or not.Then get the static performance testing;

9.After passing the performance testing, then process on the grinding machine.(Horizontal Double Faces Grinding Machine).