Metal continuous casting process and metal continuous casting device based on electromagnetic excitation combined with mechanical stirring

A technology of mechanical stirring and electromagnetic excitation, applied in the field of metal continuous casting process and metal continuous casting device, can solve the problems of shielding effect energy loss, complex process, weakening, etc. Effect

Active Publication Date: 2015-10-07
新兴发展集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Powder metallurgy technology can be used to prepare aluminum-tin alloys with relatively uniform components, but the process is complicated, the powder surface is easy to oxidize, and the mechanical properties and density of the alloy are poor; Macro-segregation and low-oxygen blanks, but the cost is very high and the production efficiency is relatively low; using rapid solidification technology, it is possible to prepare aluminum-tin alloy solidification structures with very fine grains, but for large-sized, complex-shaped blanks As far as castings are concerned, the actual effect of this technology is not good, and the cost of industrial application is high; using pulsed magnetic field technology and electromagnetic stirring technology, the aluminum-tin alloy melt is stirred without contact, and the uniform temperature field can be achieved to a certain extent. Refining the solidification structure and reducing the degree of segregation, however, both of these technologies are produced by alternating magnetic fields, and when the alternating magnetic field passes through the copper crystallizer, the huge shielding effect will cause huge energy loss. Even if the alternating magnetic field passes through the mold, there is still a skin effect in the aluminum-tin alloy melt, which will further weaken the effect of electromagnetic force. Therefore, the grain refinement effect of the slab is not obvious, and the area where the electromagnetic force acts is limited
It can be seen that there is still a lack of effective means to control the grain size and solute segregation of the solidification structure of aluminum-tin alloys.

Method used

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  • Metal continuous casting process and metal continuous casting device based on electromagnetic excitation combined with mechanical stirring
  • Metal continuous casting process and metal continuous casting device based on electromagnetic excitation combined with mechanical stirring

Examples

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Effect test

Embodiment 1

[0035] In this example, see figure 1 and figure 2 , a metal continuous casting device implementing the metal continuous casting process of electromagnetic excitation combined mechanical stirring, comprising a tundish 2, a nozzle 3, a crystallizer water cooling jacket 4, a water-cooled mold crystallizer 11 and a dummy rod 7, inside the tundish 2 The molten metal 15 passes through the nozzle 3 and is poured into the water-cooled mold crystallizer 11 at a set speed, and then through continuous casting, the billet 6 is pulled out by the dummy bar 7, and a crystallizer is provided close to the outside of the water-cooled mold mold 11 Water cooling jacket 4, cooling water flows out from water outlet 16 after water inlet 12 passes through crystallizer water cooling jacket 4, water cooling mold crystallizer 11 is placed in coil 14, the current output end of magnetic field generator 5 is connected with coil 14, open The magnetic field generator 5 adjusts the intensity of the DC curre...

Embodiment 2

[0040] This embodiment is basically the same as Embodiment 1, especially in that:

[0041] In this embodiment, the material of the rotor stirring paddle 1 is the same metal as the molten metal 15 cooled by inert gas, and the rotor stirring paddle 1 made of the same metal as the molten metal 15 will not give the molten metal 15 Any secondary pollution is caused, especially suitable for continuous casting to manufacture high-purity metal material billet 6, and it has obvious advantages in continuous casting of pure steel.

Embodiment 3

[0043] This embodiment is basically the same as the previous embodiment, and the special features are:

[0044] In this embodiment, the number of rotor stirring paddles 1 is 2, which is better than the stirring effect of 1 rotor stirring paddle 1, which can improve the turbulent agitation effect of forming chaotic flow inside the metal melt 15, and further improve the crystal structure of solidified structure. Grain refinement and uniformity.

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Abstract

The invention discloses a metal continuous casting process of electromagnetic excitation combined mechanical stirring. When the alloy melt is solidified, the electromagnetic excited combined mechanical stirring technology is used to generate microscopic and macroscale strong shear flow to break dendrites. In this way, the goal of refining the solidification structure, fully equiaxed crystallization, and reducing the degree of solute segregation can be achieved, thereby improving the performance of the alloy. The invention also provides a metal continuous casting device, which is realized by a device composed of a main crystallizer, a rotor stirring paddle, a runner, a program-controlled motor, a magnetic field generator, a coil, and a voltage-regulated and frequency-regulated AC power supply. The present invention uses the microscopic flow generated by electromagnetic excitation and the macroscopic flow generated by mechanical stirring to form a very complex chaotic flow, forming a strong shear flow, breaking dendrites, promoting the proliferation of crystal nuclei, reducing the temperature gradient, and obtaining ultra-fine Fully equiaxed crystal structure, while significantly reducing or even completely inhibiting the segregation of alloy elements, the energy consumption of the present invention is significantly lower than that of conventional electromagnetic stirring, and the energy saving effect is remarkable.

Description

technical field [0001] The invention relates to a metal continuous casting process and a metal continuous casting device, in particular to a metal continuous casting process and a metal continuous casting device for enhancing stirring of a metal melt, and is applied in the technical field of solidification. Background technique [0002] Due to its comprehensive properties such as good anti-stiction, wear resistance and friction reduction, corrosion resistance, compliance and embedding, it also has the advantages of low density, good thermal conductivity, large bearing capacity and high fatigue strength. Bearing alloys are increasingly used to replace traditional tin bronze and babbitt alloys, and become the preferred material for bearings in automotive diesel engines to meet the requirements of high speed, heavy load, energy saving and emission reduction. However, the aluminum-tin bearing alloy prepared by the traditional water-cooled iron mold casting method has coarse grai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/114B22D11/115
Inventor 钟云波吴惠兴王怀黄靖文郑天祥龙琼王迎彬刘春梅雷作胜任维丽任光宇任忠鸣
Owner 新兴发展集团有限公司
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