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Processing technology for improving magnetic performance of DT4C pure iron

A processing technology and magnetic technology, which is applied in the field of processing technology to improve the magnetic properties of pure iron DT4C, can solve the problems of low utilization rate and poor magnetic properties, and achieve the effects of increased utilization rate, decreased coercive force, and increased magnetic flux

Inactive Publication Date: 2018-03-06
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the low utilization rate and poor magnetic properties of purely mechanically processed materials for hollow cup-shaped products, the present invention proposes a processing technology that can save materials and improve the magnetic properties of pure iron cup-shaped parts

Method used

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  • Processing technology for improving magnetic performance of DT4C pure iron
  • Processing technology for improving magnetic performance of DT4C pure iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The process of extruding magnetic properties of pure iron (DT4C) provided by the present invention has the following steps:

[0025] (1) Sampling, cut Φ65x45mm DT4C bar, put it in a vacuum furnace heated to 850°C for 1h;

[0026] (2) Pretreatment, put the heat-insulated bar into the preheated and fully lubricated back-extrusion die (see figure 1 ) for extrusion, extrusion (see figure 2 ) after completion of air cooling;

[0027] The structure of the extrusion die is: the reverse extrusion die includes an upper template 13, a lower template 3, and the upper part of the lower template 3 is a die 7, and the die 7 is fixed by the die backing plate 4 and the die retaining ring 5, and the die 7 There is a spacer 2 on the inner side, the bottom of the spacer 2 is the ejector rod 1; the punch 10 is below the upper template 13, the punch 10 is fixed by the punch backing plate 14 and the punch fixing plate 11, and the punch 10 is a T-shaped structure , The corner of the T-sha...

Embodiment 2

[0035] The process of extruding magnetic properties of pure iron (DT4C) provided by the present invention has the following steps:

[0036] (1) Sampling, cut Φ55x42mm DT4C bar, put it into a vacuum furnace heated to 850°C for 1 hour;

[0037] (2) Pretreatment, put the heat-insulated bar into the preheated and fully lubricated back-extrusion die (see figure 1 ) for extrusion, extrusion (see figure 2 ) after completion of air cooling;

[0038] In this embodiment, the extrusion die described in Embodiment 1 is adopted, and the extrusion process is the same as that in Embodiment 1.

[0039] (3) Annealing treatment, put the extruded part in (2) into a vacuum furnace and heat it to 900 ° C with the furnace, keep it for 4 hours, and cool it with the furnace;

[0040] (4) Mechanical processing, turning the cooled sample in (3) into the final size of the part;

[0041] (5) According to the national standard GB / T 3656-2008 and GB / T 6983-2008, its magnetic permeability and magnetic ...

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Abstract

The invention discloses a processing technology for improving magnetic performance of DT4C pure iron. The technology comprises the following specific steps: (1) preparing a blank; cutting and processing the blank until the blank has the size as requirement; and preprocessing; (2) mounting a die based on the requirement on a sample size; and preheating until the temperature is 200-400 DEG C; (3) extruding the sample obtained in step (1) through the lubricated die; (4) annealing a cup-shaped part obtained by extruding; and (5) mechanically processing and annealing the sample to obtain the product with the size for use. According to the method, the utilization rate is increased; the magnetic performance is improved; and beneficial conditions are provided for further development of DT4C.

Description

technical field [0001] The invention relates to a processing technology for improving the magnetic properties of pure iron DT4C, which belongs to the technical field of metal magnetism. Background technique [0002] As a soft magnetic material, electrical pure iron is widely used in the components of aviation instruments, such as magnetic pole shoes, rotors, housings, etc. High magnetic permeability and magnetic saturation and very low hysteresis loss. However, its magnetism has its instability, such as obvious magnetic aging phenomenon when it is above 50 ℃, which makes the magnetism deteriorate. Therefore, in order to improve the magnetism of pure iron, in addition to strict control of smelting and heat treatment, different process methods and various process factors will affect the magnetism of the material to varying degrees during the forming process of its parts. Therefore, this work is proposed in order to grasp the degree of influence of the technological factors o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/20B21C25/02B23P15/00
CPCB21C23/20B21C25/02B23P15/00
Inventor 冯再新惠均高伟峰王献民樊文欣
Owner ZHONGBEI UNIV