1, the first is the choice of materials, such as cemented carbide and high speed steel.

2. Secondly, the distribution of magnetic flux density, the reasonable layout of magnets on the inner and outer surfaces of the mold and the adjustment of shape and size.

3. Third, choose the type of main mandrel. There are many kinds of magnetic cores, and you can choose the rectangular core of the coil.

4. Then the magnetic head must be matched with the magnet to ensure that the magnet is located exactly where the magnetic head needs it.

Finally, in the structure around the magnetic head, there are usually grooves or notches around the punch, which can be used to reduce the high magnetic field area in the workpiece and leave room for stamping and bending operations.