A high magnetic permeability and high thermal conductivity crystallizer inner sleeve with a skeleton structure

Abstract

An inner sleeve of a crystallizer with high magnetic permeability and high thermal conductivity with a skeleton structure. The inner sleeve of the crystallizer is composed of an inner sleeve base body I and a magnetic conductive skeleton I. The inner sleeve base body I is in the shape of a cylinder with open upper and lower ends. The two ends of the inner sleeve base body I are respectively fixed to the upper sealing plate and the lower sealing plate. The third inner sleeve base body of the inner sleeve base body I is inserted into the mesh of the magnetic conductive skeleton I. Coil. An inner sleeve of a crystallizer with high magnetic permeability and high thermal conductivity with a skeleton structure. The inner sleeve of the crystallizer is composed of an inner sleeve base body II and a magnetic conductive skeleton II. The inner sleeve base body I is in the shape of a cylinder with open upper and lower ends. The mesh of the sleeve base body II is interspersed with a magnetic conductive frame II. The two ends of the inner sleeve base body II are respectively fixed to the upper sealing plate and the lower sealing plate. The outer circle of the inner sleeve base body II is provided with a magnetic conductive coil. Under the action of the same electromagnetic field, the present invention can increase the magnetic field intensity at the center of the crystallizer to 4 times that of the traditional inner sleeve of the crystallizer.

Description

Technical field [0001] The invention belongs to the technical field of semi-continuous casting of copper and its alloys in the metallurgical industry, and specifically relates to a high permeability and high thermal conductivity mold inner sleeve with a skeleton structure. Background technique [0002] Electromagnetic continuous and semi-continuous technology uses alternating magnetic fields to penetrate the inner sleeve of the mold to act on the molten metal inside the mold, and use the electromagnetic force generated in the melt to achieve forced convection and reduce the contact pressure between the melt and the inner sleeve. , Improve the solidification behavior of the melt, thereby greatly improving the microstructure of the ingot, especially the effect of refining coarse columnar grains. At present, this technology has been widely used in the casting of low-density and low-melting-point metals such as aluminum and magnesium alloys, but has not been widely used in the castin...

AI Technical Summary

Problems solved by technology

[0004] Taking the pure copper inner sleeve used in the current industrial conventional semi-continuous crystallizer as an example, its thermal conductivity is good, and the thermal conductivity can reach more than 350W / m·K, but the magnetic induction intensity through the inner sleeve is less than 10mT

However, the biggest defect of this scheme is that under the repeated action of high-temperature thermal stress, the junction of the two metals is extremely easy to crack, and it is extremely difficult to achieve a smooth connection at the junction; the other design is integral, which is filled with copper sheets Alloy powder with low electrical conductivity is sintered. This design can be regarded as the evolution of the slotted scheme, which solves the problems of low strength and complex structure of the inner sleeve, but the magnetic permeability and thermal conductivity are not ideal.

[0006] In short, from the perspective of product quality and production safety, the integral mold has great advantages and is the main development trend of electromagnetic casting molds in the future. However, it is still necessary to overcome the bottleneck that the inner sleeve cannot take into account the magnetic permeability and heat conduction.

Images