CN218362085U

CN218362085U - Pressing forming device for processing sintered neodymium-iron-boron permanent magnet

Info

Publication number: CN218362085U
Application number: CN202221516465.9U
Authority: CN
Inventors: 侯立媛; 仉喜峰; 刘涛; 张时茂; 王东慧; 王怀
Original assignee: Antai North Technology Co ltd
Current assignee: Antai North Technology Co ltd
Priority date: 2022-06-17
Filing date: 2022-06-17
Publication date: 2023-01-24
Anticipated expiration: 2032-06-17

Abstract

The utility model relates to a neodymium iron boron permanent magnet die mould device specifically is a processing of sintering neodymium iron boron permanent magnet is with press forming device. Including installing the magnetic conduction left and right side board on neodymium iron boron die press, the inboard both sides of curb plate about the magnetic conduction set up one recess respectively, the inboard twice recess interval of curb plate is unanimous about the magnetic conduction, and the curb plate bottom is perpendicular and parallel about the twice recess and the magnetic conduction, and this recess closely matches with non-magnetic conduction front side board, non-magnetic conduction rear side board respectively, forms material die mould cavity with upper and lower pressure head, and the surface of going up pressure head and lower pressure head and material contact has at least one side to be sunken arcwall face, the utility model relates to a rationally, simple structure, the blank through the device suppression of the invention, surface error is less than the industry standard after the sintering, has improved the blank qualification rate after the sintering.

Description

Sintered neodymium iron boron permanent magnet processing is with compression moulding device

Technical Field

The utility model belongs to mechanical device makes the field, concretely relates to processing of sintered neodymium iron boron permanent magnet is with press forming device.

Background

The sintered neodymium iron boron has excellent magnetic performance and is widely applied in the fields of electronics, machinery and the like, and the process flow is as follows: mixing → smelting → powder making → orientation pressing → sintering and tempering → magnetic detection → mechanical processing → electroplating → finished product. The aim of orientation compression is to make the powder have semi-finished products with preset geometric shape, size, density and strength under the action of certain pressure and magnetic field, and a compression device not only influences the size of a pressed blank in the compression process, but also has a great influence on the geometric size, surface state and magnetic property of a final blank. The technology generally adopted in China is that the raw materials are subjected to orientation forming on a magnetic field press in advance to meet certain shape requirements, and then the raw materials are subjected to high-pressure pressing in an isostatic press to achieve higher pressing density, so that the subsequent sintering process is facilitated.

In the compression molding process, due to the relative motion factors of the powder, the density of the green body subjected to compression molding is uneven, and further in the sintering tempering process, due to the effects of shrinkage and the like, the blank after sintering has the problems of inward concave deformation and the like, and the qualified rate of the blank after sintering is greatly reduced. Therefore, how to further optimize the pressing device in the pressing process and improve the qualified rate of the sintered blank is a problem to be solved urgently in the field at present.

Disclosure of Invention

The utility model discloses a solve current die mould device when carrying out die mould technology, the powder distributes unevenly, and the magnetic line of force is not concentrated, and die mould dynamics is unbalanced, sintering back upper and lower surface sunken deformation scheduling problem, improves sintering back blank qualification rate, provides a device for processing sintered neodymium iron boron permanent magnet press forming, the utility model provides a blank of traditional mould suppression upper and lower sunken deflection is more than or equal to 1.2mm after the sintering, problem that the defective rate is high, through the blank of the device suppression of the invention, surface error is less than or equal to 0.3mm after the sintering, has improved sintering back blank qualification rate.

The utility model adopts the following technical scheme to realize.

A pressing forming device for processing sintered NdFeB permanent magnets. Including installing the left and right curb plate of magnetic conduction on neodymium iron boron profiling machine, the inboard both sides of curb plate about the magnetic conduction set up a recess respectively, the inboard twice recess interval of curb plate is unanimous about the magnetic conduction, the curb plate bottom is perpendicular about the recess and the magnetic conduction, this recess closely matches with preceding curb plate of non-magnetic conduction, non-magnetic back side board, forms material die mould cavity with upper and lower pressure head, goes up pressure head and connecting rod joint, especially, goes up the surface that pressure head and lower pressure head and material contacted, has at least one side to be sunken arcwall face.

In the prior art, the contact surfaces of an upper pressing head and a lower pressing head and materials are planes, so that the powder is stressed unevenly and is distributed unevenly when pressed by a press, and the upper pressing surface and the lower pressing surface of a pressed blank can be sunken and deformed after being sintered. Compared with the prior art, the utility model discloses the advantage lies in: at least one surface of the contact surfaces of the upper pressure head and the lower pressure head and the material is a concave arc surface. The blank pressed by the device has a surface error of less than or equal to 0.3mm after sintering, and has a standard surface error of less than or equal to 0.5mm in the industry, and is a qualified product. Consequently the utility model provides a blank of traditional mould suppression sunken deflection about after the sintering more than or equal to 1.2mm, problem that the defective rate is high has improved the blank qualification rate after the sintering, as listed in table 1.

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Table 1.

Drawings

FIG. 1 is that the surface that goes up the pressure head and contact with the material is equipped with sunken arcwall face, and the surface that pushes down the pressure head and contact with the material is the plane.

FIG. 2 is a concave arc surface arranged on the surface of the upper and lower pressure heads contacting with the material.

Fig. 3 is a plane surface of the pressure head contacted with the material, and a concave arc surface is arranged on the surface of the lower pressure head contacted with the material.

FIG. 4 is a schematic view of the arc-shaped surface of the recess being a circular arc-shaped surface of the recess.

Fig. 5 is a schematic view of the concave cambered surface being a concave dome cambered surface.

The figure shows 1-magnetic conduction left side plate, 2-magnetic conduction right side plate, 5-connecting rod, 6-upper pressure head and 7-lower pressure head.

Detailed Description

The present invention is not limited to the embodiments described below, and can be appropriately modified by trial and error within a range not changing the gist thereof.

Use traditional plane mould and the utility model discloses the neodymium iron boron blank of three size is suppressed to the mould of the invention to through same sintering system, test the error of the blank upper and lower surface after the sintering respectively, as listed in table 1, adopt the utility model discloses a blank of mould suppression is less than or equal to 0.3mm through sintering back upper and lower surface error, and the blank that adopts traditional plane mould suppression is more than or equal to 1.2mm through sintering back upper and lower surface error, and standard surface error is less than or equal to 0.5mm in the trade is the certified products. Therefore, the utility model discloses the surface error of neodymium iron boron blank of mould suppression after the sintering will be less than the error of traditional mould far away, has improved the qualification rate of sintered neodymium iron boron blank.

The terminology used herein is for the purpose of description and illustration, and is not intended to be limiting. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims

1. The utility model provides a processing of sintered neodymium iron boron permanent magnet is with compression moulding device, includes that the inboard both sides of curb plate set up one recess respectively about installing the left and right curb plate of magnetic conduction on the neodymium iron boron die press, magnetic conduction, and the inboard twice recess interval of curb plate is unanimous about the magnetic conduction, and the curb plate bottom is perpendicular about recess and the magnetic conduction, and curb plate, non-magnetic rear side plate closely mate, form material die mould cavity, its characterized in that with upper and lower pressure head before this recess and non-magnetic conduction: at least one surface of the surfaces of the upper pressure head and the lower pressure head, which are contacted with the material, is a concave arc surface.

2. The press forming device for processing the sintered NdFeB permanent magnet according to claim 1, which is characterized in that: the surfaces of the upper pressure head and the lower pressure head contacted with the material are all concave arc surfaces.

3. The press forming device for processing the sintered NdFeB permanent magnet according to claim 1, which is characterized in that: the surface of the upper pressure head contacted with the material is a concave arc-shaped surface, and the surface of the lower pressure head contacted with the material is a plane.

4. The press forming device for processing the sintered NdFeB permanent magnet according to claim 1, wherein: the surface of the upper pressure head contacted with the material is a plane, and the surface of the lower pressure head contacted with the material is a sunken arc-shaped surface.

5. The press forming device for processing the sintered NdFeB permanent magnet according to any one of claims 1 to 4, wherein: the concave arc-shaped surface is a concave circular arch surface, and the circular arch is parallel to the magnetic conduction side plate.

6. The press forming device for processing the sintered NdFeB permanent magnet according to any one of claims 1 to 4, wherein: the concave arc surface is a concave dome arc surface.