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Device and method for synergistic preparation of large-scale homogeneous ingot by strong shear and electromagnetic field

A strong shearing and electromagnetic field technology, applied in the field of light alloy casting, can solve the problems of easy cracking, coarse structure, serious segregation, etc., and achieve the effect of easy cleaning, avoiding cooling effect and uniform composition

Active Publication Date: 2020-03-31
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention provides a device and method for preparing a large-scale homogeneous ingot in cooperation with strong shear and electromagnetic field, which uses the complementarity of electromagnetic field and strong shear of the melt to fully uniform the temperature field and composition field of the melt in the crystallizer to solve the problem. Technical problems such as coarse structure, serious segregation, easy cracking and other defects in the preparation of large-size high-strength aluminum alloys in the prior art

Method used

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  • Device and method for synergistic preparation of large-scale homogeneous ingot by strong shear and electromagnetic field
  • Device and method for synergistic preparation of large-scale homogeneous ingot by strong shear and electromagnetic field
  • Device and method for synergistic preparation of large-scale homogeneous ingot by strong shear and electromagnetic field

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Embodiment 1

[0051] The structure of the device for preparing large-scale homogeneous ingots in cooperation with strong shear and electromagnetic fields is as follows: figure 1 As shown, it includes a crystallizer, a hot top 13, an induction coil 11, a strong melt shear unit and a dummy 8; the induction coil 11 is located inside the mold cooling water jacket 10; the inner wall of the mold jacket is inlaid with a graphite ring 12;

[0052] The upper part of the melt strong shear unit is the driving motor 1, and the lower part of the driving motor 1 is the stator sleeve 3. The top plate of the stator sleeve 3 is fixedly connected with the shell of the driving motor 1, and the driving motor 1 and the connecting shaft 2 are assembled together. , the bottom end of the connecting shaft 2 is fixedly connected to the shear blade 4, and the connecting shaft 2 and the shear blade 4 are located inside the stator sleeve 3;

[0053] The melt strong shear unit is assembled with the lifting device, and t...

Embodiment 2

[0068] Device structure is the same as embodiment 1;

[0069] Method is with embodiment 1, and difference is:

[0070] (1) The diameter of the through hole is 3mm; the magnetic field strength of the induction coil is 6000AT;

[0071] (2) The water flow rate in the crystallizer cooling water jacket is 130L / min; the casting speed is 50mm / min during the start-up stage, and then increased to 100mm / min;

[0072] (3) The aluminum alloy casting ingot is Φ300mm 2524 aluminum alloy round ingot, the appearance is as follows image 3 As shown, the surface of the ingot is smooth and there is no obvious cold shut. After inspection, there is no crack inside the ingot, and the structure is fine and uniform. Compared with conventional DC casting and low-frequency electromagnetic casting, the average grain size is reduced by 29.7% and 8.9% respectively; The metallographic structure of the 2524 aluminum alloy Φ300mm ingot prepared by semi-continuous casting, low-frequency electromagnetic cast...

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Abstract

A device and method for preparing large-sized homogeneous ingots by synergizing strong shearing and electromagnetic fields. The device includes a crystallizer, an induction coil and a melt strong shearing unit; the upper part of the melt strong shearing unit is a driving motor, and the lower part of the driving motor It is a stator sleeve, the driving motor and the connecting shaft are assembled together, the bottom end of the connecting shaft is fixedly connected to the shearing blade, and the connecting shaft and the shearing blade are located inside the stator sleeve. The method is: (1) Obtain aluminum alloy melt by smelting; (2) Lift the ingot to the lower edge of the graphite ring in the crystallizer; (3) Pour cooling water into the cooling water jacket of the crystallizer; Pour alternating current into the induction coil; The melt is poured into the crystallizer; (4) The melt strong shearing unit is inserted into the molten pool, the driving motor is started, and the shearing effect and the electromagnetic field form a composite effect until the casting is completed. The device and method of the invention ensure the uniformity of the melt temperature field and composition field, refine the structure, reduce central segregation, and increase the casting speed.

Description

technical field [0001] The invention belongs to the technical field of light alloy casting, and in particular relates to a device and method for preparing large-scale homogeneous ingots in cooperation with strong shear and electromagnetic fields. Background technique [0002] With the increasing demand for large-size aluminum alloy products in the fields of transportation, aerospace and other fields, the size of semi-continuous casting ingots continues to increase. However, the stability of material properties and the uniformity of property distribution seriously restrict the development of aviation light alloy materials. In the semi-continuous casting of large-size high-strength aluminum alloy ingots, defects such as coarse and uneven structure, macro-segregation, hot cracks, and cold cracks are easily produced, which seriously restrict the material properties. [0003] In the conventional semi-continuous casting process, the ingot is solidified from the outside to the ins...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/115B22D11/114
CPCB22D11/003B22D11/114B22D11/115
Inventor 左玉波刘旭东朱庆丰张恩阁刘凡正孔淑萍
Owner NORTHEASTERN UNIV LIAONING