The manufacture of magnets usually involves the following steps:
Raw material treatment: raw materials are batched, crushed, broken, rusted and other treatments.
Melting: The prepared material is cast to make the product composition uniform, the crystallization orientation is high, the structure consistency is good, and the formation of a-Fe is avoided.
Hydrogen explosion: Using the hydrogen absorption characteristics of rare earth intermetallic compounds, the NdFeB alloy is fused in a hydrogen environment to improve the milling efficiency of airflow milling and reduce the generation cost.
Milling: In the environment of high air pressure flow, powders collide and fuse with each other.
Molding: The powder is pressed into the shape and size required by the customer to form N and S grades.
Isostatic pressing: like an object, a uniform pressure is released, reducing the density of the product to meet the predetermined demand.
Sintering: In a high temperature environment, the pressing ring undergoes physical changes, changes its microstructure, and improves its magnetic properties. Sintering is the final step in material forming and has an extremely important impact on the density and microstructure of the magnet.
Post-machining: Dimension, magnetic properties, density measurement and appearance inspection of magnet blanks, followed by grinding and cutting.
Surface treatment: such as nickel plating, zinc plating, epoxy, nickel, copper, nickel, etc., to ensure that the product is not corroded and the appearance is exquisite.
Inspection and magnetization: check whether the appearance is intact, and then magnetize the magnet according to the requirements.
Shipment: Packing and shipping.
It can be seen that making magnets is a more complex process, which needs to go through multiple steps, each of which requires precise control of conditions to obtain magnet products that meet customer needs.
