SU377203A1 - PRESS FORM FOR PRESSING RADIALLY-ANISOTROPIC PERMANENT MAGNETS - Google Patents

Description

one

The invention relates to the production of radially anisotropic oxide permanent magnets used as stators of electric motors and generators.

A known mold for extruding a horseshoe-shaped radial-anisotropic oxide permanent magnets with a compression angle of 100 ° or more, consisting of a matrix, upper and lower punches. The upper punch is made of a magnetic conductive material with a nonmagnetic tip. The lower punch contains three parts, the external (non-magnetic) parts being mounted movably, and the central (magnetic conductive) part is provided with a tip from a non-magnetic material and is rigidly fixed on the press. The matrix consists of three parts made of a non-magnetic material; The inner part of the die is movable, and the outer parts are rigidly fixed to the press.

In order to enable the pressing of magnets from ferrite paste in the proposed mold, the matrix on the outer end is provided with a magnetic core with shims, and the lower punch in its upper part has non-magnetic rigidly fixed liners.

The drawing shows a mold for

pressing anisotropic permanent magnets.

The mold consists of a matrix 1 made of a non-magnetic material, an upper punch 2 and a lower punch 3. Magnetic conducting inserts 4 and 5 are rigidly fixed on the outer end of the matrix, and non-magnetic inserts 6 and 7 are in the upper part of the lower punch. paste magnets on working surfaces 8 and 9 of the upper and lower punches are placed on filters 10 and 1J, and holes are provided inside the punches connected to the vacuum system through channels 12

and} 3. The matrix is movable relative to the lower punch with the aid of springs.

14. In the upper part of the matrix there is a loading chamber 15.

Pressing is performed as follows.

Ferrite paste is loaded into the chamber.

15. The upper punch 2 is lowered until it touches the die /, closing the chamber 15 and forming a common pole tip with inserts 4 and 5. Next, a magnetizing device and a system for sucking the liquid from the paste during pressing are included. Since the upper and lower punches are opposing tips

magnetic system then magnetic power

the lines, which follow the shortest path from the pole to the pole, cross the loading chamber 15 perpendicular to the working surfaces of the upper and lower punches and produce a radial orientation of single particles of ferrite of the pressed mass. Moving down, the upper punch 2 lowers the die I, while the gap between the punches 2 and 5 decreases and pressing takes place in a radial-directional magnetic field. The location of the magnetic core, their liners 4 and 5 on the matrix and non-magnetic liners b and 7 on the lower punch provides a constant magnetic gap between the working surfaces of the punches 2 and 3, which at the final pressing moment allows to achieve a radial orientation of the magnetic particles in the extruded product.

Subject invention

A mold for extrusion of horseshoe-shaped radially anisotropic permanent magnets containing a matrix made of a non-magnetic material and magnetic conductive punches, characterized in that, in order to ensure the possibility of pressing magnets from a paste, the matrix at the outer end is equipped with a magnetic wiring with their inserts, and the lower punch in its upper part is provided with non-magnetic rigidly fixed inserts.