Magnetic Material Components

Veekim 0014 frei bonded NdFeB is a composite NdFeB permanent magnet made by uniformly mixing NdFeB powder with a binder such as resin, plastic or low melting point metal, followed by compression, extrusion or injection molding.

Injection molding is useful for molding products with complex shapes and thin walls.

The compression molding method is limited to magnets with a simple geometrical shape, but the density is relatively large and has a larger magnetic field strength than the compression molded magnet.

The magnetic properties of bonded NdFeB are lower than that of sintered NdFeB, but can be made into a magnet with high precision and complex shape.

In general, bonded NdFeB does not require final finishing (renovation). To prevent rust, the surface of the magnet is usually epoxy or nickel plated.

The bonded NdFeB is a mixture of rapidly quenched NdFeB powder and a polymer binder.

Weijin can produce some bonded NdFeB models
 

Compression Molding

The NdFeB powder and the epoxy material are first mixed and then placed in a mold for compression molding.

It can be made into a NdFeB magnet with a remanence (Br) of 300-830 mT. By electroplating the surface of the magnet, the surface of the magnet will be smooth and have a superior durability.
 

Injection Molding

The method is particularly suitable for mass production, although the remanence is lower than that of the compression-molded magnet, since the NdFeB powder has a relatively low remanence of about 200-630 mT, it can be manufactured into a magnet of nearly any shape. This material can be used for coating (for example, directly injecting the bonding material onto the surface of the shaft). This magnet can be used as a replacement for ferrite magnets on brushless motors.
 

Coating

Using injection molding, we can insert magnetic materials and/or plastic technology to coat them, so that the magnets can be mixed with shafts, gaskets and other functional components. This is very attractive for mass production of inserts such as shafts and gaskets. We have fully automated facilities in Japan, China and Thailand, so we can produce high quality and very competitively priced products.

Multi-component Injection Molding
The multi-component injection molding process enables a safe connection of plastics of different material properties using a single injection molding process.

The advantages of this method are:
High precision, all parts use the same manufacturing steps
Combine different features on the same part for option
Include almost all shapes, including miniaturization
Better bonding adhesion due to the bonding of various ingredients
Fewer manufacturing links
Reduced processing costs
Significantly reduced cost of manufacturing complex components in large quantities