CN101402132A - Electromagnetic auxiliary casting method and device for copper and copper alloy strip - Google Patents
Electromagnetic auxiliary casting method and device for copper and copper alloy strip Download PDFInfo
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- CN101402132A CN101402132A CNA2008101557572A CN200810155757A CN101402132A CN 101402132 A CN101402132 A CN 101402132A CN A2008101557572 A CNA2008101557572 A CN A2008101557572A CN 200810155757 A CN200810155757 A CN 200810155757A CN 101402132 A CN101402132 A CN 101402132A
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Abstract
The invention relates to an electromagnetic aided casting method and an electromagnetic aided casting device for copper and copper alloy strips. The position of a horizontal continuous casting crystallizer of a copper and copper alloy plate blank is provided with a fixed magnetic field generation device, the intensity of an externally-applied magnetic field is between 50 and 2,000G, the current is applied in a front edge area of the crystallization of a plate plank, the current intensity is between 1 and 2,000A, and the current forms a circuit along the axial direction or the transverse direction, thus a melt at the front edge of the crystallization is forcedly stirred under the action of a Lorentz force to promote a solidification area to form a large quantity of dissociative crystal nucleus to contribute to generating isometric crystals and inhibiting columnar and dendritic crystals from growing, thereby inhibiting the segregation and the inverse segregation, refining casting structures, and improving the surface quality of the plate plank and the rate of finished products of strip processing, particularly improving the rate of finished products of copper alloy strips with higher alloy content, easy segregation, and difficult hot processing. The method and the device can realize the continuous production of bronze plate planks with high tin content, and simplify homogenization treatment process.
Description
Technical field
The present invention relates to a kind of copper and electromagnetic auxiliary casting method for copper alloy strip and device, belong to technical field of nonferrous metal processing.
Background technology
Traditional copper alloy plate strip adopts D.C.casting or sequence casting technology to prepare billet, prepares the strip product through technologies such as hot rolling cogging, cold rolling processing then.Begin the eighties in 20th century, the internal copper processing industry begins to adopt the horizontal continuous-casting technology to prepare the made-up belt of thickness 14～18mm, width of plate slab is usually between 300～650mm, horizontal continuous casting process can obtain the heavy blank of big arbitrarily volume in theory, slab through uncoiling, mill face, operation such as cold rolling, prepare the strip product of all thickness specification.Although this technology can not replace piece formula method copper alloy plate strip processing technology comprehensively, the copperplate blank horizontal casting technology have energy-saving and environmental protection, efficient, save advantage such as investment, be specially adapted to the preparation of easy segregation copper alloy plate strip.
Traditional horizontal casting copper alloy plate strip can not satisfy the preparation processing request of copper alloy plate strip fully at present, mainly shows as rough surface, crackle, and cast sturcture is thick, loose, defectives such as segregation, inverse segregation.With alloy kinds such as tin-phosphor bronze, nickel bronze, packfongs is example, and when alloy content was higher, cast sturcture was thick, segregation and inverse segregation phenomenon are more serious, and the yield rate of alloy sheet strip blank and strip product is lower.
At the deficiency that the strip horizontal continuous casting technology exists, carried out a large amount of research both at home and abroad; The Electro-Magnetic Metallurgy technology is one of focus of paying close attention in the application study of metal continuous cast process aspect.
Patent 96121903.3 has applied the magnetic field of direction-agile at the crystallizer broadside of plate slab, forms stable pressure at crystal region and stirs, improve plate slab surface quality, suppress inclusion defect.Patent US-PN4846255 and US-PN4741383 adopt the mode of soft contact and electromagnetic casting to make sheet-metal blank.Similar with it, patent 200510021740.4 adopts intermediate frequency magnetic field to prepare metal sheet band, is a kind of nearly end form waste heat hot-rolling technology.Above-mentioned technology is applicable to the preparation of steel strip, adopts soft contact or electromagnetic casting principle, does not relate to copper alloy plate strip preparation processing.
Patent 200510047193.7 produces and forces to stir by applying travelling-magnetic-field, reaches the purpose that suppresses segregation, crystal grain thinning.This technology is installed electromagnetic generator between crystallizer and holding furnace, there are certain potential safety hazard in agitator body and holding furnace close contact, and applicability is poor slightly.
Patent 02149110.0 and patent 02119403.3 disclose a kind of copper pipe base electromagnetic continuous casting process respectively, apply rotating excitation field or combination field in the tube blank mould outside, the preparation pipe.Patent 02221779.7 provides horizontal continuous casting of copper alloy electromagnetic agitation crystallization apparatus, improves cast sturcture by rotating excitation field.
Above-mentioned technology does not all relate to the preparation technology and the equipment of copper and copper alloy slab.
Summary of the invention
The objective of the invention is to overcome the deficiency that prior art exists, a kind of copper and electromagnetic auxiliary casting method for copper alloy strip and device thereof are provided, be intended to effectively improve the yield rate of copper alloy plate strip, suppress segregation, thinning microstructure, improve surface quality.
Purpose of the present invention is achieved through the following technical solutions:
Copper and copper alloy plate strip electromagnetism assisted casting device, comprise horizontal casting stove group, graphite crystallizer and metal water cooling crystallizer, graphite crystallizer is installed in the side of horizontal casting stove group, the arranged outside of graphite crystallizer has the metal water cooling crystallizer, characteristics are: also comprise field generator for magnetic and dc source, described field generator for magnetic is permanent magnet or electromagnet winding, this field generator for magnetic arranges both sides up and down simultaneously at graphite crystallizer, is installed in the outside of metal water cooling crystallizer or is installed on the inside of metal water cooling crystallizer; Melt in one utmost point of described dc source and the graphite crystallizer front end electrically connects, and another electrode of dc source and the slab of graphite crystallizer rear end electrically connect, thereby dc source constitutes the loop between melt and slab.
Further, above-mentioned copper and copper alloy plate strip electromagnetism assisted casting device, one electrode of described dc source electrically connects by the melt in graphite electrode and the graphite crystallizer front end, and another electrode of described dc source electrically connects by the slab of roller and graphite crystallizer rear end.
Further, use above-mentioned device to carry out the method for copper and copper alloy plate strip electromagnetism assisted casting, characteristics are: when the copper alloy liquid in the horizontal casting stove group reaches 1000～1200 ℃, start hauling machine, drive the motion of copper alloy slab, the melt in a utmost point of dc source and the graphite crystallizer front end is electrically connected, and another electrode of dc source and the slab of graphite crystallizer rear end are electrically connected, constitute current loop between melt and slab, current strength is at 1～2000 ampere; Field generator for magnetic produces 50～2000 Gausses' magnetic field, and the melt of energising is subjected to Lorentz force action when running through the magnetic field of graphite crystallizer, and electromagnetic force forms mandatory stirring to the melt of solidification front in the graphite crystallizer.
Substantive distinguishing features and obvious improvement that technical solution of the present invention is outstanding are mainly reflected in:
By at copper and copper alloy plate blank horizontal casting crystallizer position the fixed-field generating means being set, and apply electric current in zone, slab crystallization forward position, electric current forms the loop vertically or laterally; Thereby, making the melt in crystallization forward position be subjected to Lorentz force action is forced to stir, impel and solidify a large amount of free nucleus of zone formation, help to generate equiax crystal, suppress column and dendritic growth, suppress segregation and inverse segregation, refinement cast sturcture, improve steel slab surface quality and strip processed finished products rate, especially improve the yield rate of the copper alloy plate strip of the higher and easy segregation of alloy content, hot-working difficulty, improve copper alloy slab castability.The field generator for magnetic that is applied is a fixed-field, is permanent magnet or electromagnet winding, and is easy for installation, safe and reliable to operation; This technical scheme has realized the continuous production of high tin content bronze slab, has simplified the homogenising treatment process, and its application prospect is very wide.
Description of drawings
Below in conjunction with accompanying drawing technical solution of the present invention is described further:
Fig. 1: structural representation of the present invention;
Fig. 2: mixing effect schematic diagram;
Fig. 3 a: apply line of solidification shape schematic diagram before the magnetic field;
Fig. 3 b: apply magnetic field after coagulation wire shaped schematic diagram.
The implication of each Reference numeral sees the following form among the figure:
| Reference numeral | Implication | Reference numeral | Implication | Reference | Implication | |
| 1 | Horizontal |
2 | |
3 | Field generator for magnetic | |
| 4 | |
5 | |
6 | Slab |
The specific embodiment
Copper as shown in Figure 1 and copper alloy plate strip electromagnetism assisted casting device, comprise horizontal casting stove group 1, graphite crystallizer 2, field generator for magnetic 3 and dc source 4 and metal water cooling crystallizer 5, graphite crystallizer 2 is installed in the side of horizontal casting stove group 1, the arranged outside of graphite crystallizer 2 has metal water cooling crystallizer 5, field generator for magnetic 3 is permanent magnet or electromagnet winding, this field generator for magnetic 3 arranges both sides about in the of 2 simultaneously at graphite crystallizer, is installed in the outside of metal water cooling crystallizer 5 or is installed on the inside of metal water cooling crystallizer 5; One electrode of dc source 4 electrically connects by the melt in graphite electrode and graphite crystallizer 2 front ends, and another electrode of dc source 4 electrically connects by the slab of roller and graphite crystallizer 2 rear ends, and dc source 4 constitutes the loop between melt and slab.
By fixed-field generating means 3 being set, externally-applied magnetic field intensity 50～2000 Gausses at copper and copper alloy plate blank horizontal casting crystallizer position; And apply electric current in zone, slab crystallization forward position, and 1～2000 ampere of current strength, electric current forms the loop vertically, and it is axial that current loop is parallel to strip; Thereby, making the melt in crystallization forward position be subjected to Lorentz force action is forced to stir, mixing effect as shown in Figure 2, impel and solidify a large amount of free nucleus of zone formation, help to generate equiax crystal, suppress column and dendritic growth, thereby suppress segregation and inverse segregation, refinement cast sturcture, raising steel slab surface quality and strip processed finished products rate, especially improve the yield rate of the copper alloy plate strip of the higher and easy segregation of alloy content, hot-working difficulty.
Field generator for magnetic 3 is fixed on the outside of metal water cooling crystallizer 5, graphite crystallizer 2 is installed on the horizontal casting stove group 1 together with metal water cooling crystallizer 5, when the copper alloy liquid in the horizontal casting stove group 1 reaches 1000～1200 ℃, start hauling machine, begin continuous casting, drive 6 motions of copper alloy slab, melt in one electrode of dc source 4 and graphite crystallizer 2 front ends is electrically connected, the slab of another electrode of dc source 4 and graphite crystallizer 2 rear ends is electrically connected, constitute current loop between melt and slab, current strength is at 50～500 amperes; Field generator for magnetic 3 produces 50～500 Gausses' magnetic field, and the melt of energising is subjected to Lorentz force action when running through the magnetic field of graphite crystallizer 2, and electromagnetic force forms mandatory stirring to the melt of solidification fronts in the graphite crystallizer 2.Up to surface color be greyish white alternate, solidify trace straight till, keep this stable state, produce.
Utilize plate shearer intercepting strip sample, observe its solidified structure, test its mechanical property.The as-cast specimen yield strength is 300～350MPa, percentage elongation 45～55%; The homogenizing annealing time was reduced to below 4 hours by 8～12 hours, and casting temperature reduces by 20～30 ℃.
Field generator for magnetic 3 is fixed on the inside of metal water cooling crystallizer 5, graphite crystallizer 2 is installed on the horizontal casting stove group 1 together with metal water cooling crystallizer 5, when the copper alloy liquid in the horizontal casting stove group 1 reaches 1000～1200 ℃, start hauling machine, begin continuous casting, drive 6 motions of copper alloy slab, melt in one electrode of dc source 4 and graphite crystallizer 2 front ends is electrically connected, the slab of another electrode of dc source 4 and graphite crystallizer 2 rear ends is electrically connected, constitute current loop between melt and slab, current strength is at 50～500 amperes; Field generator for magnetic 3 produces 150～1000 Gausses' magnetic field, and the melt of energising is subjected to Lorentz force action when running through the magnetic field of graphite crystallizer 2, and electromagnetic force forms mandatory stirring to the melt of solidification fronts in the graphite crystallizer 2.Up to surface color be greyish white alternate, solidify trace straight till, keep this stable state, produce.
Utilize plate shearer intercepting strip sample, observe its solidified structure, test its mechanical property.The as-cast specimen yield strength is reduced to 300～350MPa, and percentage elongation reaches 45～55%; The homogenizing annealing time was reduced to below 4 hours by 8～12 hours, and casting temperature reduces by 20～30 ℃.
It should be noted that, impressed current direction, current strength, conduction time are adjustable at interval, the melt that the copper coin base is solidified front end is realized intensity, direction and the controllable mandatory electromagnetic agitation of frequency, and electromagnetic force changes by adjusting electric current and magnetic field parameter the mixing direction and the stirring intensity of melt.
In sum, magnetic field that technical scheme of the present invention applies is fixed-field, and field generator for magnetic is permanent magnet or electromagnet winding, and is easy for installation, safe and reliable to operation; By electromagnetic agitation, refinement cast sturcture suppresses segregation and inverse segregation defective, improves copper alloy slab castability; Realize the continuous production of high tin content bronze slab, simplified the homogenising treatment process.
On the one hand, electromagnetic agitation makes that the field distribution of crystallizer internal temperature is more even, helps the even distribution of alloying element, therefore helps suppressing the segregation and the inverse segregation of alloying element; Because segregation phenomena is suppressed significantly, improves the cold and hot working performance of alloy greatly, simplify the homogenising treatment process, energy-saving and cost-reducing.
On the other hand, continue or step stirring, destroyed the order of crystallization mode of melt in the crystallization forward position, made a large amount of free nucleus, the nucleus that is free on melt inside becomes new nucleating center.Along with the reinforcement of stirring action, free nucleus quantity increases, and has increased forming core density, and proportion of equiaxed grain increases thereupon.Therefore the cast sturcture of the obvious refinement slab of electromagnetic agitation suppresses the growth of column crystal and dendrite, improves proportion of equiaxed grain.
Also have, melt adds forced flow under the electromagnetic field effect outside, and the meniscus shape in crystallization forward position is changed; Force stirring that high-temperature fusant is transported to the crystallization forward position, make line of solidification move forward, and meniscus arc heights of roofs is descended, the uniform distribution of temperature field increase in crystallization forward position, line of solidification is milder, forms crystallization forward position shown in Fig. 3 b; And apply line of solidification such as Fig. 3 a before the magnetic field.Electromagnetic agitation in the crystallizer helps improving the surface quality of strip blank, will reduce the surperficial milling amount of strip blank, improves the yield rate of strip lumber recovery and strip processing.
Below only be concrete exemplary applications of the present invention, protection scope of the present invention is not constituted any limitation.All employing equivalents or equivalence are replaced and the technical scheme of formation, all drop within the rights protection scope of the present invention.
Claims (3)
1. copper and copper alloy plate strip electromagnetism assisted casting device, comprise horizontal casting stove group (1), graphite crystallizer (2) and metal water cooling crystallizer (5), graphite crystallizer (2) is installed in the side of horizontal casting stove group (1), the arranged outside of graphite crystallizer (2) has metal water cooling crystallizer (5), it is characterized in that: also comprise field generator for magnetic (3) and dc source (4), described field generator for magnetic (3) is permanent magnet or electromagnet winding, this field generator for magnetic (3) arranges both sides up and down simultaneously at graphite crystallizer (2), is installed in the outside of metal water cooling crystallizer (5) or is installed on the inside of metal water cooling crystallizer (5); Melt in one electrode of described dc source (4) and graphite crystallizer (2) front end electrically connects, the slab of another electrode of dc source (4) and graphite crystallizer (2) rear end electrically connects, thereby dc source (4) constitutes electric loop between melt and slab.
2. copper according to claim 1 and copper alloy plate strip electromagnetism assisted casting device, it is characterized in that: an electrode of described dc source (4) electrically connects by the melt in graphite electrode and graphite crystallizer (2) front end, and another electrode of described dc source (4) electrically connects by the slab of roller and graphite crystallizer (2) rear end.
3. the described device of claim 1 carries out the method for copper and copper alloy plate strip electromagnetism assisted casting, it is characterized in that: when the copper alloy liquid in the horizontal casting stove group (1) reaches 1000～1200 ℃, start hauling machine, drive copper alloy slab (6) motion, melt in one electrode of dc source (4) and graphite crystallizer (2) front end is electrically connected, the slab of another electrode of dc source (4) and graphite crystallizer (2) rear end is electrically connected, constitute current loop between melt and slab, current strength is at 1～2000 ampere; Field generator for magnetic (3) produces 50～2000 Gausses' magnetic field, and the melt of energising is subjected to Lorentz force action when running through the magnetic field of graphite crystallizer (2), and electromagnetic force forms mandatory stirring to the melt of the interior solidification front of graphite crystallizer (2).
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| CNA2008101557572A CN101402132A (en) | 2008-10-09 | 2008-10-09 | Electromagnetic auxiliary casting method and device for copper and copper alloy strip |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101905298A (en) * | 2010-08-13 | 2010-12-08 | 东北大学 | Device and method for manufacturing copper or copper alloy slab |
| CN102990026A (en) * | 2012-05-31 | 2013-03-27 | 江苏科技大学 | Device and method for applying ultrasonic field for horizontal continuous casting of copper alloy plate strip |
| CN103691901A (en) * | 2013-12-29 | 2014-04-02 | 山东亨圆铜业有限公司 | Cored crystallizer for upwardly drawing continuous casting copper tubes and method for manufacturing high-performance copper alloy tubes |
| CN105020565A (en) * | 2015-07-30 | 2015-11-04 | 绍兴市力博电气有限公司 | Copper-silver alloy strip for reverser and production process of copper-silver alloy strip |
| CN105414511A (en) * | 2015-12-13 | 2016-03-23 | 李福金 | Downward-drawing continuous casting device for copper alloy profile |
| CN107008873A (en) * | 2017-04-11 | 2017-08-04 | 上海大学 | Multi-mode electrically magnetic field homogenizes the preparation method and its device of metal strand |
| CN112620600A (en) * | 2020-12-03 | 2021-04-09 | 中铜华中铜业有限公司 | Horizontal continuous casting equipment for high-tin phosphor bronze alloy strip blank |
| CN114101613A (en) * | 2021-11-22 | 2022-03-01 | 上海大学 | Method and device for preparing homogeneous immiscible alloy continuous casting billet through high-intensity magnetic field composite melt overheating treatment |
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2008
- 2008-10-09 CN CNA2008101557572A patent/CN101402132A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101905298A (en) * | 2010-08-13 | 2010-12-08 | 东北大学 | Device and method for manufacturing copper or copper alloy slab |
| CN101905298B (en) * | 2010-08-13 | 2012-05-30 | 东北大学 | Device and method for manufacturing copper or copper alloy slab |
| CN102990026A (en) * | 2012-05-31 | 2013-03-27 | 江苏科技大学 | Device and method for applying ultrasonic field for horizontal continuous casting of copper alloy plate strip |
| CN103691901A (en) * | 2013-12-29 | 2014-04-02 | 山东亨圆铜业有限公司 | Cored crystallizer for upwardly drawing continuous casting copper tubes and method for manufacturing high-performance copper alloy tubes |
| CN103691901B (en) * | 2013-12-29 | 2015-06-24 | 山东亨圆铜业有限公司 | Cored crystallizer for upwardly drawing continuous casting copper tubes and method for manufacturing high-performance copper alloy tubes |
| CN105020565A (en) * | 2015-07-30 | 2015-11-04 | 绍兴市力博电气有限公司 | Copper-silver alloy strip for reverser and production process of copper-silver alloy strip |
| CN105020565B (en) * | 2015-07-30 | 2018-04-10 | 浙江力博实业股份有限公司 | A kind of commutator Kufil band and its production technology |
| CN105414511A (en) * | 2015-12-13 | 2016-03-23 | 李福金 | Downward-drawing continuous casting device for copper alloy profile |
| CN107008873A (en) * | 2017-04-11 | 2017-08-04 | 上海大学 | Multi-mode electrically magnetic field homogenizes the preparation method and its device of metal strand |
| CN112620600A (en) * | 2020-12-03 | 2021-04-09 | 中铜华中铜业有限公司 | Horizontal continuous casting equipment for high-tin phosphor bronze alloy strip blank |
| CN114101613A (en) * | 2021-11-22 | 2022-03-01 | 上海大学 | Method and device for preparing homogeneous immiscible alloy continuous casting billet through high-intensity magnetic field composite melt overheating treatment |
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