Nd-Fe-B powder molding press

Abstract

The invention relates to an Nd-Fe-B powder molding press. The Nd-Fe-B powder molding press comprises a rack, an upper punching assembly and a lower punching assembly, wherein the upper punching assembly and the lower punching assembly are arranged on the rack from top to bottom. The upper punching assembly comprises an upper pressing plate, a main hydraulic cylinder, a pressure relief piston and an upper punch, wherein the upper pressing plate is fixedly mounted on the upper portion of the rack; the main hydraulic cylinder comprises a cylinder block mounted on the upper pressing plate and a piston arranged in the cylinder block in an up-down moving mode; the lower end of the piston is provided with a containing cavity with a downward opening; the containing cavity forms a pressure relief cylinder block; the pressure relief piston is arranged in the pressure relief cylinder block in an up-down moving mode, and the pressure relief piston and the pressure relief cylinder block form a pressure relief cylinder; the upper punch is connected to the lower end of the pressure relief piston. According to the Nd-Fe-B powder molding press, the pressure relief cylinder is embedded in a piston of the main hydraulic cylinder; the structure is simple and ingenious; the overall dimensions of the Nd-Fe-B powder molding press are greatly reduced; the matching performance of the weight and the overall dimensions of the press and the dimensions of pressing blanks are improved; energy consumption is effectively reduced on the premise of guaranteeing the production efficiency.

Description

technical field [0001] The invention relates to the technical field of forming presses, in particular to an NdFeB powder forming press. Background technique [0002] Permanent magnets are made of rare earth alloys, mainly Nd 2 Fe 14 B. Sm 2 co 17 and SmCo 5 Made of metal alloy. Permanent magnets have unique high-density magnetic energy. The preparation of permanent magnets requires the use of expensive raw materials and huge production costs. The technology for producing permanent magnets must meet certain requirements in order to obtain the best raw material output and the best magnetic properties. The main production steps of permanent magnets are: melting the alloy; grinding the alloy into a particle powder usually smaller than 10 microns; pressing the particle powder into a magnetic field, and then sintering the compact; obtaining the final desired shape of the magnet through machining, and finally magnetizing the magnet. [0003] Among them, powder compaction is t...

AI Technical Summary

Problems solved by technology

[0026] (1) After the first step of pressing, the mechanical properties of the magnet compact are poor, and it cannot be sintered immediately, and cold isostatic pressing equipment is required for the second pressing

[0027] (2) Low degree of automation leads to high labor costs

[0028] (3) The second step of cold isostatic pressing technology not only increases the pressing cost and production time, but also increases the risk of contamination with air, oil and other consumables

[0029] (4) Due to the need for packaging before CIP, it is impossible to use near-net shape pressing technology

[0037] (2) The rheological properties of rare earth permanent magnet powder, especially the severe fluidity, are the key problems affecting the production of near-net shape blanks

[0038] (3) In general, all presses currently in use are extremely mismatched in compact size to press equipment weight and overall size

The further development of better high-tech presses is a challenge in order to make the control system of the machine more intelligent and thus support the operator

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