Neodymium iron boron (NdFeB) die for forming uniform oriented magnetic field

Abstract

The invention provides a neodymium iron boron (NdFeB) die for forming a uniform oriented magnetic field, and relates to the forming die for an NdFeB production process. The die consists of a box-type lower mold frame with an opening upwards composed of a pair of end templates and a pair of side templates on the periphery and a liftable bracket at the bottom part, lining plates on the inner walls of the side templates, lower dies and brackets in the lining plates, and upper dies fixed under upper die extension rods, wherein, the upper end parts of the lower dies are equipped with a plurality of semi-cylindrical cavity grooves with openings upwards, and the lower end parts of the upper dies are correspondingly equipped with a plurality of semi-cylindrical cavity grooves with openings downwards; and a magnetic conductive strip is embedded into the inside of the middle part of each lining plate with a joint line as a centre line, and the section of the magnetic conductive strip is of a double-trapezoid conjoint shape. The die of the invention has the following advantages of improving uniformity deviation from 12% to 3% and strengthening rigidity and wear resistance of the working region of the die.

Description

Technical field: [0001] The invention relates to a molding die for the production process of neodymium iron boron. Background technique: [0002] At present, the production of known NdFeB permanent magnet materials consists of smelting, powder making, mixing, molding, sintering, machining, surface treatment and other processes. The molding process is to use a mold to press the powdery particles into multiple parallel cylindrical bars or cubes on a double magnetic field molding press. The mold used is composed of a pair of end templates around, a pair of side templates, and a liftable bracket at the bottom. Opening It consists of an upward box-shaped lower mold frame, a pair of lining plates fitted and fixed on the inner walls of a pair of side formworks, a lower mold and a bracket that fit and fit inside a pair of lining plates, and an upper mold fixed on the upper mold rod; The upper end of the lower mold of the cylindrical product is a plurality of semi-cylindrical cavity...

AI Technical Summary

Problems solved by technology

It is known that the strength of the forming orientation magnetic field plays a major role in the remanence Br and coercive force Hcj indicators of the product, which is likely to cause consistency deviation of the product

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