Mold and method for isobaric floating pressing of multiple ring-shaped magnet blanks in one mold

Abstract

A mould, and a method for isobaric floating pressing of multiple ring-shaped magnet blanks. After feeding, the upper die plate is downward, and the multiple upper die punches connected by the upper die equal pressure mechanism use the principle of equal pressure everywhere in the fluid and transmit the pressure through hydraulic oil to keep the pressure of multiple upper die punches equal; Each inner cavity of the female mold is provided with a tapered table wall; when pressing, the punch of the lower die does not move, the punch of the upper die presses down, and the pressure of each punch is equal; while the punches of the upper and lower dies are maintaining pressure, the lower template The interlocking magnetizing coil, the lower die, and the mandrel move upward synchronously, and the lower die presses the cross-section of the ring-shaped magnet blank to the center of the circle, and the center of the coil magnetic field fully magnetizes and scans the pressed magnet blank to realize floating suppress. It overcomes the unbalanced pressing force of multiple sub-cavities in one mold with multiple outputs, and ensures that the mold presses the ring-shaped blank to complete the entire floating pressing process of magnetization-pressing-demagnetization in the coil magnetic field; the inner magnetic polarity of the pressed workpiece is arranged Uniformity and consistent mass density improve the efficiency of magnetic powder molding and pressing.

Description

technical field [0001] The invention relates to a powder magnetic field molding press, in particular to an isobaric floating pressing mold and method for one mold with multiple ring-shaped magnet blanks. Background technique [0002] In recent years, various rare earth NdFeB powders are pressed, sintered, sliced, and ground in a specific magnetic field to produce crystalline rare earth alloy ring-shaped anisotropic magnets, which are widely used in motors in the motor field, speakers in the electroacoustic industry, and other Devices in the electrical field, etc. At present, the main applications of the preparation of ring materials in the magnetic material industry are: one mold and one output, the magnetic radial alignment of the powder is carried out through the magnetic field and then pressed to improve the quality of the magnetic energy of the prepared parts. The biggest disadvantage is that the production efficiency is not high; for To improve the production efficienc...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a mold and method for isobaric floating pressing of ring-shaped magnet blanks with multiple outputs in one mold, which mainly solves the problem of unbalanced pressing force of multiple sub-cavities in one mold with multiple outputs, so as to ensure that the mold is pressed in the magnetic field of the coil. The floating pressing of the whole process of magnetization (magnetic powder)-pressing-demagnetization (ring-shaped blank) is completed inside; the inner magnetic polarity of the pressed workpiece is uniformly arranged and the mass density is consistent, so that the efficiency of magnetic powder forming and pressing can be improved.

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