Alumium alloy low frequency electromagnetic semi-continuous casting method and device

A low-frequency electromagnetic field, semi-continuous technology, applied in the field of material processing, can solve the problems of little improvement in solid solution and segregation of alloying elements, complex application of pulsed magnetic field and current device, little improvement in ingot performance, etc., to improve macro segregation, Effect of improving surface quality and increasing yield

Inactive Publication Date: 2003-06-25
NORTHEASTERN UNIV
View PDF0 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because this method has extremely high requirements on the stability of the casting machine, if the casting machine shakes slightly, there will be ripples on the surface, and the establishment of the casting start process is very difficult, thus limiting the industrial application of this technology
After that, new methods such as DC electromagnetic field, AC, and DC current were produced, but none of them became industrial technologies due to ineffective effects and complicated processes.
[0009] In 1986, the Frenchman Vives et al realized the electromagnetic casting of Φ320mm ingot of 2024 aluminum alloy by using the power frequency electromagnetic field, and found that the surface segregation was improved and the grains were refined. However, due to the limited penetration depth of the power frequency magnetic field, it had little effect on the internal structure. Espe

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Alumium alloy low frequency electromagnetic semi-continuous casting method and device
  • Alumium alloy low frequency electromagnetic semi-continuous casting method and device
  • Alumium alloy low frequency electromagnetic semi-continuous casting method and device

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030] Adopt the method of the present invention to carry out aluminum alloy low-frequency electromagnetic field semi-continuous casting on the device of the present invention: Example 1: 7075 aluminum alloy low-frequency electromagnetic field semi-continuous casting:

[0031] 7075 aluminum alloy chemical composition Zn Mg Cu Cr Mn Fe Si Al5.1~6.1 2.0~3.0 1.2~2.0 0.16~0.3 ≤0.15 ≤0.5 ≤0.5 Balance ingot size: 200 Casting conditions: casting temperature 680~720℃, Casting speed 80mm / min, cooling water pressure: 0.08Mpa, aluminum alloy dummy rod, no bottom laying. Electromagnetic field conditions: frequency 30Hz, realized on the first structure crystallizer, electromagnetic field strength: 20000At

[0032] to cast

make

party

Law

Grain

size

mm

Grain

shape

Intragranular Zn

Content%

Zn

macro

view

Partial

analysis

Rate

%

#

Mg

...

example 2

[0035] It can be seen that after low-frequency electromagnetic semi-continuous casting, the grains are obviously refined, the grain shape is transformed into equiaxed or rose shape, the solid solubility of alloy elements in the grain is obviously increased, the internal stress is greatly reduced, the cracks are eliminated, the macro segregation is eliminated, and the surface Defects such as segregation tumors are eliminated, and the mechanical properties of the material after processing are significantly improved. Example 2: Semi-continuous casting of ultra-high strength aluminum alloy with low frequency electromagnetic field:

[0036] casting method

[0037] It can be seen that after low-frequency electromagnetic semi-continuous casting, the ultra-high-strength aluminum alloy grains are significantly refined, the grain shape is transformed into equiaxed or rose-shaped, the solid solubility of alloy elements in the grain is significantly improved, cracks are eliminate...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The present invention belongs to the field of material processing technology. The equipment includes one crystallizer, one coil outside or inside the crystallizer with low-frequency current passing through. The semi-continuous aluminium alloy casting process in low-frequency electromagnetic field has electromagnetic field frequency of 15-50 Hz, casting temperature 680-750 deg.c, casting speed 50-150 mm/min and cooling water pressure 0.06-0.12 MPa. The present invention has fined crystal grains, full solid dissolving of alloy elements inside the crystal, no crack, no segregate, improved surface quality and high ingot quality.

Description

Technical field [0001] The invention belongs to the technical field of material processing Background technique [0002] Modern material preparation technology pursues low cost and high performance, that is, high performance price ratio. Modern material science tells us that a large number of defects in materials are produced during alloy casting, and a considerable part of the defects are difficult to repair in subsequent processing and heat treatment. Therefore, melting and casting is no longer just a means of material shaping, but more importantly, it is the first important link in material quality control. Fine grain and homogeneity are the basic directions for improving the performance of modern metal materials. The modern aluminum processing industry has higher and higher requirements for the quality of ingots. It is usually hoped to avoid cracks on the basis of ensuring the composition and size, so as to improve the yield; grain refinement, improve processability an...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B22D11/115B22D21/04
Inventor 崔建忠张北江许光明路贵民秦克
Owner NORTHEASTERN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap