The advantages of metal injection molding dynamic magnetic pressing technology

metal injection molding

Metal powder injection molding technology requires products to be pressed, and traditional pressing technology has certain limitations. With the continuous development of powder metallurgy technology, a series of new technologies for powder metallurgy compression molding have emerged. Dynamic magnetic compression technology is one of the new technologies. So, what are the advantages of metal powder injection molding dynamic magnetic compression molding technology?

 

Advantages of dynamic magnetic pressing for metal powder injection molding:

  1. Since no mold is used, the mold wall friction is reduced to 0 during molding, so higher pressing pressure can be achieved, which is beneficial to improving products and reducing production costs;
  2. Since pressure can be applied at any temperature and atmosphere and is suitable for all materials, the working conditions are more flexible;
  3. Since this process does not use lubricants and binders, the molded products do not contain impurities, have high performance, and are also environmentally friendly;
  4. Dynamic magnetic pressed parts can be sintered under conventional sintering conditions, and their mechanical properties are higher than traditional pressed parts. Dynamic magnetic pressing is suitable for manufacturing cylindrically symmetrical near-net-shape parts, thin-walled tubes, parts with high aspect ratios and parts with complex internal shapes;
  5. Moving magnetic pressing is being used to develop high-performance bonded NdFeB magnets and sintered SmCo magnets. Due to the high density of bonded NdFeB magnets pressed by moving magnets, their magnetic energy product can be increased by 15%-20%.

Powder metallurgy sintering methods usually fall into the following categories:

 

  1. Liquid phase sintering

If there are more than two components in the powder compact, sintering may be performed above the melting point of a certain component, so a small amount of liquid phase will appear in the powder compact during sintering.

 

  1. Pressure sintering

During sintering, pressure is applied to the powder body to promote its densification process. Pressure sintering is sometimes synonymous with hot pressing. Hot pressing is a process that combines powder forming and sintering to directly obtain powder metallurgy products.

 

  1. Activation sintering

Certain physical or chemical measures are adopted during the sintering process to greatly reduce the sintering temperature and significantly shorten the sintering time, while the performance of the sintered body is improved and enhanced.

 

  1. Electric spark sintering

When the powder is formed and pressed, direct current and pulse electricity are passed through, causing arcs to be generated between the powder particles for sintering. During sintering, pressure is gradually applied to the workpiece, combining the two processes of forming and sintering.

 

  1. Powder solid phase sintering

A powder sintering method in which the components of bulk powder or compact do not melt during the sintering process. Powder solid phase sintering can be divided into unit system solid phase sintering and multi-system solid phase sintering according to the number of components.

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