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A kind of preparation method of 6.5wt% high-silicon electrical steel thin-walled hollow pipe

A high-silicon electrical steel and hollow tube technology, applied in the field of preparation of 6.5wt% high-silicon electrical steel thin-walled hollow tubes, can solve the problems of limited product size and specification, poor product surface quality, serious environmental damage, etc. Simple, low-cost effects

Active Publication Date: 2021-06-25
XI'AN PETROLEUM UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used methods for preparing or producing high-silicon electrical steel developed in recent years include spray forming method, vapor deposition method, molten salt method, rapid solidification method, gradual plasticizing rolling method, etc., but the above methods are relatively conducive to the production of plates, while It is difficult to process and prepare profiles of this alloy, such as hollow pipes
Moreover, the production of high-silicon electrical steel by spray forming and vapor deposition technology will generate a large amount of dust particles during the production process, which will seriously damage the environment; the production of high-silicon electrical steel by molten salt method will not directly damage the environment, but due to the special process The preparation method of the method makes the production efficiency too low and the surface quality of the product is poor, which is not conducive to the subsequent smoothing of the product; although the preparation of high-silicon electrical steel by the rapid solidification method has little damage to the environment and the production efficiency is higher than other processes, However, there are many internal defects in the product, and the size and specification of the product are very limited. The subsequent relatively complicated heat treatment process is required to ensure the magnetic properties of the product; the production of high-silicon electrical steel by the gradual plasticizing rolling method can be carried out on traditional rolling mills in my country. However, in the production process of this method, appropriate heat treatment processes are required to reduce the degree of order of the product so as to improve the ability of the alloy to continuously deform and process, which reduces the continuity of production and affects the production efficiency. efficiency

Method used

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  • A kind of preparation method of 6.5wt% high-silicon electrical steel thin-walled hollow pipe
  • A kind of preparation method of 6.5wt% high-silicon electrical steel thin-walled hollow pipe

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Effect test

Embodiment 1

[0025] This embodiment includes the following steps:

[0026] (1) The composition ratio of the design alloy material, the mass percentage of low carbon steel is 85%, and the mass percentage of industrial silicon block is 15%;

[0027] (2) Fix the four-petal rigid overcoat forming mold and its outer rubber sleeve 1, install and fix the core rigid inner sleeve 5 and the rubber sleeve 4; the material used for the four-petal rigid overcoat forming mold is martensite Stainless steel, the size of each petal mold is the same, that is, the central angle corresponding to each petal arc is a right angle; in order to better mold and ensure the smoothness and smoothness of the inner and outer walls of the processed high-silicon electrical steel hollow pipe, The outer and inner walls of the four-petal mold are seamlessly bonded; both ends of the rigid jacket need rubber plugs 6, and the outer side of the rubber plug 6 needs to be flat, and the rubber plug 6 must be flat on the outside, and...

Embodiment 2

[0033] In order to obtain a 6.5wt% high-silicon electrical steel hollow tube with an outer light asymmetric outer wall, the method of this embodiment is basically the same as that of Embodiment 1, but the difference from Embodiment 1 is that

[0034] (1) The mass percentage of low carbon steel is 90%, and the mass percentage of industrial silicon block is 10%;

[0035] (2) Ensure that the diameter of the inner rubber sleeve of the four-petal mold is the same and share the center of the circle; according to the design of the asymmetrical outer wall, the distance between the outer cylinder liner and the inner rubber sleeve needs to be adjusted, and it is pressed and formed in a cold isostatic press, and then removed from the mold; In the atmosphere protection furnace, the outer light type asymmetric outer wall metal hollow tube green body with four-petal steel sleeve is sintered. The sintering temperature is 1250 ℃, the sintering atmosphere is argon, and the temperature is raised...

Embodiment 3

[0037] In order to obtain the hollow tube of 6.5wt% high-silicon electrical steel with an asymmetric inner wall of external light type, the method of this embodiment is basically the same as that of Embodiment 1, but the difference from Embodiment 1 is that

[0038] (1), the mass percentage of low carbon steel is 87%, and the mass percentage of industrial silicon block is 13%;

[0039](2) Ensure that the diameter of the outer cylinder liner of the four-petal mold is the same and share the center of the circle; according to the design of the asymmetrical inner wall, the distance between the outer cylinder liner and the inner rubber sleeve needs to be adjusted, pressed and formed in a cold isostatic press, and then removed from the mold; Sinter the outer light type asymmetric inner wall metal hollow tube green body with four-petal steel sleeve in the atmosphere protection furnace. The sintering temperature is 1250 ℃, the sintering atmosphere is argon, and the temperature is raise...

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Abstract

A method for preparing a 6.5wt% high-silicon electrical steel thin-walled hollow pipe, comprising the following steps: (1) designing the composition ratio of the alloy material; (2) fixing the four-petal rigid outer casing molding die and its outer rubber casing; (3) According to the composition ratio and then charge and form, to ensure the uniform thickness of the metal tube blank after powder pressing in the mold; design the distance between the inner rubber sleeve and the rigid outer sleeve according to the actual working conditions; (4) in the cold isostatic press Press molding; (5) demoulding the metal tube blank, but retaining the four-petal external steel sleeve; (6) putting the metal tube blank with the four-petal external steel sleeve obtained in step (5) into a vacuum furnace together Carry out sintering, and remove the four-petal steel sleeve after cooling to obtain a thin-walled hollow tube of 6.5wt% high-silicon electrical steel with smooth tube wall; the present invention adjusts the space between the two molds of the four-petal double steel sleeve 6.5wt% high-silicon electrical steel hollow pipes with different specifications and different degrees of symmetry can be prepared.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy technology and preparation and processing of soft magnetic alloy pipes, and in particular relates to a method for preparing thin-walled hollow pipes of 6.5wt% high-silicon electrical steel. Background technique [0002] As a soft magnetic alloy with excellent magnetic properties, high-silicon electrical steel is an important alloy material used to prepare transformers, sensors, generators and motors in the telecommunications industry. The content of silicon in the matrix of this material is generally greater than 3.5wt % (mass fraction twt%, the same below). Among the above-mentioned series of soft magnetic alloys, the high-silicon electrical steel sheet with a silicon content of 6.5wt% has the most remarkable magnetic properties. Under a high-frequency magnetic field, its magnetostriction coefficient is about zero, its magnetic permeability is high, and its iron loss Low, so it has bec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F5/12B22F3/04B22F3/10B22F3/03
CPCB22F3/03B22F3/04B22F3/1007B22F5/106B22F2998/10B22F2999/00B22F2201/20B22F2201/10
Inventor 姬帅刘忠军雒设计刘艳明
Owner XI'AN PETROLEUM UNIVERSITY