Pressing processes for sintered hard ferrite magnets

Jahrzehntelange Erfahrung macht sich bezahlt. Unsere Permanentmagnete zeichnen sich durch ein Höchstmaß an Qualität und Zuverlässigkeit aus. Stetig optimierte Produktionsabläufe und hervorragend ausgebildete Fachkräfte bilden die Basis für anwendungsgerechte Industriemagnete. Beispielsweise gepresste Hartferritmagnete.

01Axial pressing

During the production of sintered magnets, magnetic powder is pressed into so-called "green bodies" and then sintered. In the case of magnets with an axially preferred direction, the magnetic powder must already be magnetically aligned during the pressing process. This is done via a coil system integrated into the tool. If the pressing direction and the magnetic alignment field match, the process is referred to as axial pressing.

02Transverse field or diametrical pressing

As with the production of magnets with an axially preferred direction, the anisotropy is completed with a coil system integrated into the tool. During transverse field pressing, the alignment field is aligned vertically toward the pressing direction

03Isostatic pressing

During the production of NdFeB and SmCo magnets, the so-called isostatic pressing process is used in addition to the axial and transverse field pressing processes.

The magnetic powder is filled into flexible moulds, magnetically aligned and grouted evenly from all sides in an oil bath. This process allows the production of high remanent magnets because the magnetically aligned powder particles are evenly condensed from all sides. This prevents a mechanical discharging of the powder particles during the pressing process.