Method for improving quality of continuous casting hollow bloom by applying composite alternating electromagnetic field and device
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A technology of hollow tube and electromagnetic field, which is applied in the field of hollow metal tube blank preparation, can solve the problems of unobvious improvement of solidification structure, achieve good appearance quality, reduce manufacturing cost, and promote the effect of grain refinement
Inactive Publication Date: 2008-11-05
DALIAN UNIV OF TECH
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This method can effectively improve the surface quality of the tube bl
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Embodiment 1
[0013] By placing a power frequency traveling wave magnetic field generator (7) in the inner crystallizer (5), an aluminum alloy tube blank of φ180×20mm is prepared, and the specific steps are as follows:
[0014] Step 1: Preparation of Convex Traveling Wave Magnetic Field Generator
[0015] The convex traveling wave magnetic field generator 7 adopts three pole pairs of coils, the current frequency is 50Hz, the phase angle is 120°, and the power supply is 1-3kW. The outwardly convex traveling wave magnetic field generator 7 is placed in the inner mold 5 so that the distance between the outer side of each coil and the inner side of the inner mold is 20 mm, and it is located near the initially solidified shell 9 of the hollow shell.
[0016] Step 2: Aluminum Alloy Billet Melting
[0017] The aluminum alloy billet is melted to 720-730°C in a resistance furnace, refined, degassed and slag removed, then kept warm for use.
[0018] Step 3: Electromagnetic continuous casting of hol...
Embodiment 2
[0023] By placing a power frequency rotating magnetic field generator 7 in the inner crystallizer 5, an aluminum alloy tube blank of φ180×20mm is prepared, and the specific steps are as follows:
[0024] Step 1: Preparation of the Convex Rotating Field Generator
[0025] The convex rotating magnetic field generator 7 adopts three pole pairs of coils, the current frequency is 50Hz, the phase angle is 120°, and the power supply is 1-3kW. The outwardly convex rotating magnetic field generator 7 is placed in the inner mold 5 so that the distance between the outside of each coil and the inside of the inner mold is 20mm, and it is located near the initial solidified shell 9 of the hollow shell.
[0026] Step 2: Aluminum Alloy Billet Melting
[0027] The aluminum alloy billet is melted to 720-730C in a resistance furnace, refined, degassed and slag removed, then kept warm for use.
[0028] Step 3: Electromagnetic continuous casting of hollow billets
[0029] Put the bottom mold 11...
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Abstract
The invention discloses a method and a device for improving the quality of continuously cast hollow billets by imposing a compound alternating electromagnetic field, which pertains to the technical field of the preparation of metal materials. The method and the device of the invention are that the outside of a slotted outer crystallizer is provided with electromagnetic coils with medium frequency and high frequency and the liquid surface is kept parallel to the central plane of the coins, with an error not exceeding plus or minus 5mm; meanwhile, a convex magnetic field generator with low and medium frequency is arranged in the cooling water sheath inside an inner crystallizer, which is adjacent to a initially solidified shell. The method and the device of the invention have the advantages that: (1) the surface vibration mark caused by the vibration of crystallizers is settled and the segregation tumors, cracks and other defects on the inner and outer surface of the hollow billets are eliminated, thus having good apparent mass; (2) the solidification structure has good homogenization and fine crystal grain and can be directly rolled in a as-cast state; (3) the placement of the convex magnetic field generator in the inner crystallizer simplifies the design of the magnetic field generator and saves the space of industrialized operations, which is especially beneficial to the production of the large-caliber hollow billets. The method of the invention is applicable to the production of various alloy hollow billets.
Description
technical field [0001] The invention belongs to the technical field of metal material preparation, in particular to the preparation of hollow metal tube blanks. Background technique [0002] The output and quality of seamless metal pipes mainly depend on the production of hollow tube blanks. At present, there are two main methods of producing hollow metal tube blanks: one is the piercing method, the main process is to obtain a casting slab through continuous casting of molten metal, the casting slab is cooled, processed, and then heated and perforated to obtain a hollow metal tube blank. The metal tube blank is rolled or cold drawn to obtain a seamless metal tube. Although the piercing method is relatively mature and widely used in the preparation of hollow metal tube blanks, its disadvantages of low efficiency and high energy consumption are also obvious, especially for the preparation of certain high-alloy steel and special-shaped hollow metal tube blanks. In the process...
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