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A Spinning Forming Method for Making Soft Magnetic Alloy Cylindrical Parts

A technology of spinning forming and soft magnetic alloy, which is applied in the direction of manufacturing tools, heat treatment equipment, furnace types, etc., can solve the problems of low forming quality and low magnetic performance, and achieve the goal of improving utilization rate, good magnetic performance and good forming quality Effect

Active Publication Date: 2018-06-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the comprehensive process of heat treatment and spinning forming of the soft magnetic alloy tube billet, the defects of low forming quality and low magnetic properties of the traditional cutting or cold stamping methods are solved

Method used

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  • A Spinning Forming Method for Making Soft Magnetic Alloy Cylindrical Parts
  • A Spinning Forming Method for Making Soft Magnetic Alloy Cylindrical Parts
  • A Spinning Forming Method for Making Soft Magnetic Alloy Cylindrical Parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] As shown in 1. The soft magnetic alloy cylindrical part is made of 1J50 soft magnetic alloy (the content of Fe and Ni is about 50%), the inner diameter d=50mm, the wall thickness δ=1mm, and the length l=240mm. Magnetic performance requirements: maximum permeability ≥ 65mH / m, coercive force ≤ 8.8A / m, saturation magnetic induction = (1.5±0.1)T.

[0050] 1. Use the 1J50 soft magnetic alloy tube with a specification of Φ60*5mm prepared by the factory as the blank, with an inner diameter of 50mm and a wall thickness of 5mm (such as Figure 4 As shown), the wall thickness of the parts required for forming the tube blank of this specification is reduced from 5mm to 1mm, and the thinning rate is 80%.

[0051] A margin of 8mm is left at the bottom of the tube blank as a fixed part during spinning, and the trimming margin at the mouth is 10mm. According to the principle of constant volume, the length of the tube blank should be calculated to be 55mm.

[0052] 2. Put the tube bl...

Embodiment 2

[0058] The soft magnetic alloy cylindrical piece is made of 1J50 soft magnetic alloy (the content of Fe and Ni is about 50%), and the shape is as figure 1 Shown, its inner diameter d=80mm, wall thickness δ=2mm, length l=200mm. Magnetic performance requirements: maximum permeability ≥ 68mH / m, coercive force ≤ 7.5A / m, saturation magnetic induction = (1.5±0.1)T.

[0059] 1. Use the 1J50 soft magnetic alloy tube prepared by the factory with a specification of Φ90*5mm as the blank, with an inner diameter of 80mm and a wall thickness of 5mm (such as Figure 4 As shown), the wall thickness of the parts required for forming the tube blank of this specification is reduced from 5mm to 2mm, and the thinning rate is 60%.

[0060] A margin of 8mm is left at the bottom of the tube blank as a fixed part during spinning, and the trimming margin at the mouth is 10mm. According to the principle of constant volume, the length of the tube blank should be calculated to be 48mm.

[0061] 2. Put t...

Embodiment 3

[0066] The soft magnetic alloy cylindrical piece is made of 1J50 soft magnetic alloy (the content of Fe and Ni is about 50%), and the shape is as figure 1 Shown, its inner diameter d=60mm, wall thickness δ=2mm, length l=170mm. Magnetic performance requirements: maximum permeability ≥ 70mH / m, coercive force ≤ 7.0A / m, saturation magnetic induction = (1.5±0.1)T.

[0067] 1. Use the 1J50 soft magnetic alloy tube with a specification of Φ70*5mm prepared by the factory as the blank, with an inner diameter of 60mm and a wall thickness of 5mm (such as Figure 4 As shown), the wall thickness of the parts required for forming the tube blank of this specification is reduced from 5mm to 3mm, and the thinning rate is 40%.

[0068] A margin of 8mm is left at the bottom of the tube blank as a fixed part during spinning, and the trimming margin at the mouth is 10mm. According to the principle of constant volume, the length of the tube blank should be calculated to be 112mm.

[0069] 2. Put ...

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Abstract

The invention discloses a spinning forming method for manufacturing a magnetically soft alloy cylindrical part. The method includes the steps that the geometric dimensions of a cylindrical blank are determined according to the principle that the material size is not changed in the plastic deformation process, the actual wall thickness of the thin-wall cylindrical part, the requirement for trimming after forming and the design principle that the wall thickness reduction rate is 40%-80%; the pipe blank is heated to 700 DEG C, and preheating is carried out after 0.5h of heat preservation; multi-pass staggered spinning forming is carried out on the cylindrical blank to enable the wall thickness to be reduced to a predetermined value; a workpiece subjected to spinning forming is heated to 1100-1180 DEG C in vacuum protection, heat preservation is conducted for 3-6h, then the workpiece is cooled to 600 DEG C at the speed which is not higher than 200 DEG C / h and continues to be cooled to 200 DEG C at the speed not smaller than 400 DEG C / h, and the workpiece is discharged out of a furnace and subjected to final heat treatment to improve the magnetic performance of the material; and excess materials at the two ends of the workpiece are cut off, so that a final product is obtained. By means of the spinning forming method for manufacturing the magnetically soft alloy cylindrical part, the cylindrical part with high forming quality and good soft magnetism performance can be obtained, and the defects that a traditional machining method is low in material utilization rate, poor in forming quality, prone to flux leakage and the like are overcome.

Description

technical field [0001] The invention relates to the spinning preparation of cylindrical parts, in particular to a spinning forming method for preparing soft magnetic alloy cylindrical parts. Background technique [0002] Magnetic shields are an important means for shielding electromagnetic interference, and soft magnetic alloys are the main materials used to make high-performance magnetic shields because of their good magnetic properties. However, soft magnetic alloys have high deformation resistance and low plasticity in the cold and hard state. For a long time, the research on the feasibility of plastic forming of soft magnetic alloys has been stagnant. [0003] At present, for soft magnetic alloy parts, the main processing methods are turning, stamping and welding of cold-rolled plates. When turning is used, a large machining allowance is required, and the material utilization rate is low, generally only 20% to 30%, which will cause a lot of waste of materials, and the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D22/16C22F1/10C21D9/00
CPCB21D22/16C21D9/0068C22F1/10
Inventor 夏琴香程秀全戴国勇
Owner SOUTH CHINA UNIV OF TECH
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