One-die-multiple-output ring-type magnet blank isobaric floating pressing die and method

Abstract

The invention discloses a one-die-multiple-output ring-type magnet blank isobaric floating pressing die and method. After feeding, an upper die plate moves downward, and through a plurality of upper die punches connected to an upper die isobaric mechanism, by the application of the principle that the pressure intensities in fluid are equal everywhere, through hydraulic oil transmission pressure intensity, the pressures of the upper die punches maintain equal; a taper stage wall is arranged in each circular inner cavity of a lower female die; during pressing, lower die punches do not move, the upper die punches press downward, and the pressures of the punches are equal; while pressure maintaining is performed on the upper die punches and the lower die punches, a lower die plate is in linkage with a magnetizing coil, the lower female die and core rods to ascend synchronously, the lower female die extrudes ring-type magnet blanks in the direction from the cross section to the circle center, the pressing magnet blanks are fully magnetized and scanned by a coil magnetic field center, and the floating pressing is achieved. By means of the one-die-multiple-output ring-type magnet blank isobaric floating pressing die and method, the problem that the pressing forces of a plurality of sub-die cavities in a one-die-multiple-output mode are unbalanced is solved, and it is guaranteed that the die pressing ring-type blanks complete the whole floating pressing process of magnetizing-pressing-demagnetizing in the coil magnetic field; a pressing formed workpiece is uniform in inside magnetic polarity distribution and consistent in mass density, and therefore the efficiency of magnetic powder forming pressing is improved.

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 NdFeS 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 magnets. 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 ...

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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