Exploring the Beauty of Magnets: Unveiling the Precision Machining Process of Sintered NdFeB

In the previous newsletter, we have introduced all the pre-processing steps for sintering NdFeB magnets, including melting and casting, hydrogen decrepitation, jet milling, orientation pressing, and sintering. Through these steps, we obtain a raw magnet known as a blank. The blank is usually in the form of a large block or cylinder. So how do we obtain the desired shapes and dimensions of our products? Today, we will discuss the mechanical processing of sintered NdFeB magnets, which is used to transform the blank into various required shapes.

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The qualification of a magnetic product not only depends on its magnetic performance but also on the control of dimensional tolerances, which directly affects its product performance and applications. Different dimensional accuracy requirements are specified for sintered NdFeB products based on customer demands, along with requirements for surface smoothness, parallelism, perpendicularity, and others. Therefore, we need to employ efficient and high-precision automated machining equipment to meet customer requirements.

Common mechanical processing methods for NdFeB magnets include:

Cutting: Using a slicing machine to cut the block or cylindrical magnet into square or circular pieces.

Drilling: Machining holes in cylindrical or block magnets to create tubular or box-like magnets.

Shaping: Machining circular or square magnets into various complex shapes such as wedges, sectors, grooves, or irregular shapes.

In practical applications, the shapes and performances of NdFeB permanent magnets vary greatly, such as disks, cylinders, rings, tubular magnets (with inner holes), square pieces, blocks, sectors, wedges, trapezoids, polygons, and irregular shapes. Moreover, sintered NdFeB magnets are manufactured using powder metallurgy, which results in high hardness and brittleness, making them prone to fracture. Additionally, the heat generation, corrosion, and defects during the machining process can damage the magnetic properties. Therefore, it is crucial to select appropriate processing methods based on these characteristics.

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Recently, new processing methods such as electrical discharge machining, laser processing, and ultrasonic processing have been developed.

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INNUOVO has a strong capability in the mechanical processing of NdFeB magnets, which can meet customers' diverse manufacturing needs while ensuring high machining precision.

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