Instantaneous strong peak magnetic pulse auxiliary plate strip horizontal continuous casting crystallizer

Abstract

The utility model belongs to the field of metal material preparation, and discloses an instantaneous strong peak magnetic pulse auxiliary plate strip horizontal continuous casting crystallizer. The crystallizer comprises a cooling system, a graphite crystallizer inner sleeve and an instantaneous magnetic pulse generator; the graphite crystallizer inner sleeve comprises an inner sleeve upper plate, an inner sleeve lower plate and an inner sleeve edge strip; the cooling system comprises an upper water-cooling copper mold and a lower water-cooling copper mold which are respectively attached to the inner sleeve upper plate and the inner sleeve lower plate; a cavity is defined by the upper water-cooling copper mold, the lower water-cooling copper mold, the inner sleeve upper plate, the inner sleeve lower plate and the crystallizer shell, and the instantaneous magnetic pulse generator is arranged at the position, close to the front edge of a metal melt solidification solid-liquid interface, in the cavity and attached to the side wall of the upper water-cooling copper mold and the side wall of the lower water-cooling copper mold. And other spaces in the cavity are filled with heat insulation filling materials. By means of the crystallizer, the internal quality of a casting blank can be improved, composition segregation can be reduced, the internal structure of a cast ingot can be refined, and especially the uniformity of the internal structure of a plate and strip blank can be improved.

Description

Technical Field

[0001] The utility model belongs to the field of metal material preparation, and more specifically relates to an instantaneous strong peak magnetic pulse assisted plate and strip horizontal continuous casting crystallizer. Background Art

[0002] Since the crystallizer of horizontal continuous casting is arranged horizontally, the static pressure of the molten metal in the crystallizer is low, which avoids bulging of the ingot. The intermediate tank and the crystallizer of horizontal continuous casting are sealed, which effectively prevents the secondary oxidation of the molten metal. The ingot has high cleanliness and its inclusion content is generally only 1 / 8-1 / 16 of that of the curved ingot. Therefore, the ingot quality is good, which is conducive to casting alloys containing easily oxidizable elements and small-section high-quality metal ingots.

[0003] Horizontal continuous casting of slabs is an important process for producing non-ferrous metal slabs. As the thickness is only 15-20mm, the temperature gradient is large during casting, the cooling speed is fast, and defects such as segregation, center looseness, inclusions and pores are prone to occur during solidification, which seriously affects the product quality. Domestic and foreign methods mainly improve the quality of the ingot by optimizing the alloy smelting process, improving the melt quality, optimizing the alloy composition, optimizing the casting process parameters, and extending the homogenization annealing time, but none of them can fundamentally solve the above problems.

[0004] In order to solve the problems of uneven solidification structure, component segregation, central porosity, inclusions and pores in the slab, new horizontal continuous casting methods have been developed at home and abroad. Among them, the electromagnetic casting technology has the most obvious effect. This technology performs horizontal continuous casting under the action of an alternating electromagnetic field. It not only solves the problem of surface quality of horizontal continuous casting slabs, but also can refine the edge structure of the ingot. However, it does not significantly improve the uniformity of the slab's structural structure, component segregation (especially the reverse segregation behavior in certain alloys), and central defects.

[0005] Therefore, it is urgent to propose an instantaneous strong peak magnetic pulse assisted horizontal continuous casting crystallizer for plates and strips. Utility Model Content

[0006] The purpose of the utility model is to provide an instantaneous strong peak magnetic pulse assisted plate and strip horizontal continuous casting crystallizer to meet the requirements of plate and strip materials for the quality of the cast billet. The crystallizer of the utility model can not only improve the internal quality of the cast billet and reduce component segregation, but also refine the internal structure of the ingot, especially improve the uniformity of the internal structure of the plate and strip billet.

[0007] In order to achieve the above-mentioned object, the utility model provides an instantaneous strong peak magnetic pulse assisted plate and strip horizontal continuous casting crystallizer, the crystallizer comprising a cooling system, a graphite crystallizer inner sleeve and an instantaneous magnetic pulse generator;

[0008] The inner sleeve of the graphite crystallizer comprises an inner sleeve upper plate, an inner sleeve lower plate and an inner sleeve side strip; the inner sleeve upper plate, the inner sleeve lower plate and the inner sleeve side strip together enclose a crystallization channel;

[0009] The cooling system comprises an upper water-cooled copper mold and a lower water-cooled copper mold respectively arranged in contact with the inner sleeve upper plate and the inner sleeve lower plate, and a water inlet and outlet communicating with the upper water-cooled copper mold and the lower water-cooled copper mold are arranged on the outer shell of the crystallizer;

[0010] The upper water-cooled copper mold, the lower water-cooled copper mold, the inner sleeve upper plate, the inner sleeve lower plate and the crystallizer shell form a cavity, and the transient magnetic pulse generator is arranged in the cavity near the front position of the solid-liquid interface of the metal melt, and is in contact with the side walls of the upper water-cooled copper mold and the lower water-cooled copper mold; the other space in the cavity is filled with a heat-insulating filling material;

[0011] The transient magnetic pulse generator comprises a cooling water jacket and a waterproof wire group, wherein the cooling water jacket comprises an inner cavity for sheathing the waterproof wire group and a cooling channel for cooling water to flow.

[0012] Preferably, the size of the crystallization channel is (400-500)×(15-17) mm.

[0013] Preferably, the inner sleeve upper plate, the inner sleeve lower plate and the inner sleeve edge strip are all made of three-high graphite.

[0014] Preferably, the material of the crystallizer shell near the inlet side of the crystallization channel is selected from heat-insulating filling material, and a sealing heat-resistant material layer is provided between the contact surface between the crystallizer shell near the inlet side of the crystallization channel and the intermediate insulation furnace on the horizontal continuous casting platform.

[0015] Preferably, the sealing heat-resistant material layer is one of aluminum silicate asbestos pad, high temperature resistant aluminum silicate asbestos fiber felt and high temperature resistant heat insulating rock wool.

[0016] Preferably, the crystallization channel is sealed with a slab ingot and coated paper.

[0017] Preferably, the thickness of the heat insulating filling material between the crystallizer shell on the inlet side close to the crystallization channel and the transient magnetic pulse generator is ≥45 mm;

[0018] The thermal insulation filling material is chalk or clay.

[0019] Preferably, the shell of the crystallizer is provided with excitation coil terminals and a water inlet and outlet communicated with the cooling channel; the waterproof wire group is connected to the instantaneous strong peak magnetic pulse power supply through the excitation coil terminals.

[0020] Preferably, the waterproof wire group is wound by waterproof flat copper wire with a cross-sectional size of (2-3)×(6-7) mm, a height of 70-100 mm, and a total number of turns of 150-350;

[0021] The material of the cooling water jacket is paramagnetic heat-resistant stainless steel with a thickness of 1.5-2 mm.

[0022] Preferably, the paramagnetic heat-resistant stainless steel is one of 316L stainless steel, 320 stainless steel and 316 stainless steel.

[0023] The beneficial effects of the technical solution of the utility model are as follows: the crystallizer of the utility model can be used for horizontal continuous casting of metal materials such as copper alloys and aluminum alloys, and the instantaneous strong peak pulse electromagnetic force generated by the crystallizer acts on the solid-liquid interface front of the metal melt inside the crystallizer, so that the melt produces forced convection, breaks up coarse dendrites, and increases the nucleation rate; the crystallizer of the utility model can significantly refine the grains and improve the segregation of the horizontal continuous casting strips of copper alloys and aluminum alloys. Specifically:

[0024] 1. When the crystallizer provided by the utility model is used for horizontal continuous casting of nonferrous alloy strips such as copper and aluminum alloys, the instantaneous strong peak pulse electromagnetic force generated by it is used to act on the nonferrous alloy melt inside the crystallizer. Under the action of the instantaneous strong peak pulse electromagnetic field, the front edge of the solid-liquid interface generates an electromagnetic force perpendicular to the side wall of the crystallization channel (the side wall of the inner sleeve of the graphite crystallizer) in the melt, so that the crystal nuclei that are preferentially nucleated at the side wall of the crystallization channel fall off, and the side wall of the crystallization channel re-nucleates, becoming a "nucleus source" for the proliferation of crystal nuclei. Under the action of the instantaneous strong peak pulse electromagnetic force, the melt near the side wall of the crystallization channel generates radial forced convection, which on the one hand disperses the detached crystal nuclei into the interior of the melt, and on the other hand promotes the uniformity of the temperature distribution at the front edge of the solid-liquid interface, and the low temperature zone expands into the interior of the molten pool, which is conducive to the survival of free crystal nuclei and becomes an effective nucleation core. Therefore, in the microstructure of the non-ferrous metal strip produced by the crystallizer of the utility model, the dendrites become denser, the distance between the dendrites is significantly reduced, the size of the second phase precipitated between the dendrites becomes finer and the distribution is more uniform, and the degree of internal second phase segregation is significantly reduced. In addition, for some non-ferrous alloys with low-melting point phases, there is a serious low-melting point reverse segregation phenomenon on both sides of the strip. This is mainly because during the solidification process of such non-ferrous alloy slabs, the internal and external temperature gradients are large. After the hard shell is formed on the surface, the middle part is in a liquid state. During cooling and crystallization, the heat re-melts the low-melting point substances between the dendrites in the outer shell to form a "channel". The liquid phase rich in low-melting point phase elements in the middle is squeezed from the "channel" to the surface to form reverse segregation. After adopting the crystallizer and horizontal continuous casting process of the utility model, the reverse segregation phenomenon is significantly improved, and the "agglomerated" continuous distribution of the reverse segregation phase is changed to a "sparse" discontinuous distribution.

[0025] 2. The cooling water jacket of the instantaneous magnetic pulse generator of the utility model is made of heat-resistant stainless steel with paramagnetic characteristics, and the magnetic lines of force can pass smoothly, thereby ensuring that the magnetic pulse passing through the melt does not deform and the magnetic field strength does not weaken, thereby achieving the best effect.

[0026] 3. The inner sleeve of the graphite crystallizer of the utility model is made of three-high graphite material, which has the characteristics of high strength, high density and high purity. The inner sleeve is assembled by an inner sleeve upper plate, an inner sleeve lower plate and an inner sleeve side strip. Under the action of an instantaneous strong peak pulse magnetic field, it can reduce the friction between the molten metal and the side wall of the crystallization channel during the casting process, thereby obtaining a horizontal continuous casting ingot with good surface quality.

[0027] 4. The internal excitation coil of the instantaneous magnetic pulse generator in the utility model is wound by waterproof flat copper wire with a cross-sectional size of 2×6mm or 3×7mm, a height of 70-100mm, and a total number of turns of 150-350. The pulse magnetic field generated by the instantaneous strong peak magnetic pulse power supply acts on the metal melt, which can obtain a good refinement effect and improve the segregation effect.

[0028] 5. The contact surface between the crystallizer and the molten metal of the utility model adopts insulating filling materials and sealing heat-resistant materials to isolate and protect the water-cooled copper mold and the transient magnetic pulse generator of the cooling system; wherein, "the thickness of the insulating filling material between the crystallizer shell near the entrance side of the crystallization channel and the transient magnetic pulse generator is ≥45mm, and the insulating filling material is chalk or clay", which is very necessary for the horizontal continuous casting of non-ferrous alloy slabs and strips, because a large amount of non-ferrous alloy melt is prone to violent reaction when encountering a small amount of water, and even explosion and other accidents.

[0029] 6. The research on the application of pulsed magnetic field to static solidification of nonferrous alloy melts shows that the pulsed electromagnetic force generated by the pulsed magnetic field acts on the nonferrous alloy melt inside the crystallizer, causing the melt to produce forced convection and strong oscillation, which can break up coarse dendrites, increase the nucleation rate, and have a significant effect on the grain refinement of nonferrous alloys. In addition, the pulsed magnetic field has a stronger penetration power on the metal melt, which can achieve the casting of a larger area ingot. After optimized design, the crystallizer of the utility model is easy to assemble and maintain.

[0030] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present invention.

[0032] Figure 1An external schematic diagram of an instantaneous strong peak magnetic pulse assisted horizontal continuous casting crystallizer of a plate and strip provided in Example 1 of the utility model is shown.

[0033] Figure 2 An internal schematic diagram of an instantaneous strong peak magnetic pulse assisted horizontal continuous casting crystallizer of a plate and strip provided in Example 1 of the utility model is shown.

[0034] The following are the descriptions of the reference numerals:

[0035] (1-1) Generator water cooling inlet; (1-2) Crystallizer shell; (1-3) Upper water cooling copper mold inlet and outlet; (1-4) Excitation coil terminal; (1-5) Generator water cooling outlet; (1-6) Thermal insulation filling material; (1-7) Crystallizer inlet;

[0036] (2-1) water inlet and outlet of the lower water-cooled copper mold; (2-2) lower water-cooled copper mold; (2-3) metal liquid-solid two-phase region; (2-4) inner sleeve lower plate; (2-5) slab ingot; (2-6) inner sleeve upper plate; (2-7) upper water-cooled copper mold; (2-10) transient magnetic pulse generator; (2-11) sealing heat-resistant material layer; (2-13) intermediate insulation furnace; (2-14) molten metal. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0038] The utility model provides an instantaneous strong peak magnetic pulse assisted plate and strip horizontal continuous casting crystallizer, the crystallizer comprises a cooling system, a graphite crystallizer inner sleeve and an instantaneous magnetic pulse generator;

[0039] The inner sleeve of the graphite crystallizer comprises an inner sleeve upper plate, an inner sleeve lower plate and an inner sleeve side strip; the inner sleeve upper plate, the inner sleeve lower plate and the inner sleeve side strip together enclose a crystallization channel;

[0040] The cooling system comprises an upper water-cooled copper mold and a lower water-cooled copper mold respectively arranged in contact with the inner sleeve upper plate and the inner sleeve lower plate, and a water inlet and outlet communicating with the upper water-cooled copper mold and the lower water-cooled copper mold are arranged on the outer shell of the crystallizer;

[0041] The upper water-cooled copper mold, the lower water-cooled copper mold, the inner sleeve upper plate, the inner sleeve lower plate and the crystallizer shell form a cavity, and the transient magnetic pulse generator is arranged in the cavity near the front position of the solid-liquid interface of the metal melt, and is in contact with the side walls of the upper water-cooled copper mold and the lower water-cooled copper mold; the other space in the cavity is filled with a heat-insulating filling material;

[0042] The transient magnetic pulse generator comprises a cooling water jacket and a waterproof wire group, wherein the cooling water jacket comprises an inner cavity for sheathing the waterproof wire group and a cooling channel for cooling water to flow.

[0043] In one example, the size of the crystallization channel is (400-500)×(15-17) mm.

[0044] In the utility model, the slab ingot guide is arranged at an appropriate position in the crystallization channel, and the sealing between the ingot guide and the upper and lower graphite inner sleeves is achieved by sealing coated paper. The position of the front end of the slab ingot guide in the crystallization channel is an appropriate position well known to those skilled in the art. As a preferred embodiment, the front end of the slab ingot guide is about 150 mm away from the outlet of the crystallization channel. After the crystallizer is filled with molten metal, the billet puller is started to pull out the initially solidified billet.

[0045] In one example, the inner sleeve upper plate, the inner sleeve lower plate and the inner sleeve edge strip are all made of three-high graphite.

[0046] In the present utility model, the three-high graphite is a graphite product with high strength, high density and high purity, which is well known in the art and is also called special graphite.

[0047] In one example, the material of the crystallizer shell near the entrance of the crystallization channel is selected from heat-insulating filling material, and a sealing heat-resistant material layer is provided between the contact surface between the crystallizer shell near the entrance of the crystallization channel and the intermediate insulation furnace on the horizontal continuous casting platform.

[0048] In one example, the sealing heat-resistant material layer is one of aluminum silicate asbestos pad, high temperature resistant aluminum silicate asbestos fiber felt and high temperature resistant heat insulating rock wool.

[0049] In one example, the crystallization channel is sealed with a slab ingot and coated paper.

[0050] In one example, the thickness of the heat insulating filling material between the crystallizer shell on the inlet side of the crystallization channel and the transient magnetic pulse generator is ≥45 mm.

[0051] In one example, the insulating filler material is chalk or clay.

[0052] In the utility model, since there are three-way cold sources on both sides of the crystallizer, the metal melt cools quickly here, so the heat-insulating filling material also plays a role in heat preservation.

[0053] In the utility model, the arrangement and number of turns of the waterproof wire group are obtained based on inductance optimization calculation. In one example, the waterproof wire group is wound with waterproof flat copper wire with a cross-sectional size of (2-3)×(6-7) mm, a height of 70-100 mm, and a total number of turns of 150-350.

[0054] In one example, the cooling water jacket is made of paramagnetic heat-resistant stainless steel with a thickness of 1.5-2 mm.

[0055] In one example, the paramagnetic heat-resistant stainless steel is one of 316L stainless steel, 320 stainless steel and 316 stainless steel.

[0056] The utility model also provides the application of the instantaneous strong peak magnetic pulse assisted plate and strip horizontal continuous casting crystallizer in the horizontal continuous casting of non-ferrous alloy plate and strip billets.

[0057] In one example, the nonferrous alloy sheet or strip is a copper alloy sheet or strip or an aluminum alloy sheet or strip.

[0058] The utility model also provides a horizontal continuous casting method, which utilizes the instantaneous strong peak magnetic pulse to assist the horizontal continuous casting crystallizer of the plate and strip, and comprises the following steps:

[0059] S1: Send cooling water into the cooling channels of the upper water-cooled copper mold, the lower water-cooled copper mold and the cooling water jacket, so that the cooling water pressure in the cooling channels of the water-cooled copper mold, the lower water-cooled copper mold and the cooling water jacket reaches a preset value; turn on the instantaneous strong peak magnetic pulse power supply;

[0060] S2: Connect the crystallizer with the intermediate insulation furnace on the horizontal continuous casting platform, so that the molten metal in the intermediate insulation furnace flows into the crystallization channel of the crystallizer; use a billet drawing machine to draw the billet, and in the direction from the outlet to the inlet of the crystallization channel, the front end of the slab ingot is the slab, the metal liquid-solid two-phase region and the metal melt in sequence, and the instantaneous strong peak magnetic pulse generated by the instantaneous magnetic pulse generator acts on the solid-liquid interface front of the metal melt until the horizontal continuous casting is completed.

[0061] In one example, the preset value is 0.2-0.4 MPa.

[0062] In the utility model, the channel arrangement of the water inlet and outlet communicating with the upper water-cooled copper mold and the lower water-cooled copper mold and the water inlet and outlet communicating with the cooling channel and the number of the water inlet and outlet are designed according to the simulation optimization results, thereby ensuring that the water cooling intensity above and below the inner sleeve of the graphite crystallizer is consistent.

[0063] In one example, the voltage of the instantaneous strong peak magnetic pulse power supply is 100-450V, and the pulse frequency is 2-10Hz.

[0064] In one example, the temperature of the molten metal before flowing into the crystallization channel of the crystallizer is 1185-1195°C.

[0065] In one example, the drawing speed is 100-250 mm / min.

[0066] In the utility model, after the temperature of the molten metal in the intermediate holding furnace reaches the casting temperature (i.e., 1185-1195°C), the billet drawing machine is turned on, and the molten metal in the intermediate holding furnace is allowed to flow into the crystallization channel of the crystallizer (wherein, the intermediate holding furnace is provided with a gate plate for controlling the height of the melt, and the gate plate is opened to allow the molten metal to flow into the crystallizer only when the molten metal injected into the intermediate holding furnace reaches a certain height (exceeding the cross-sectional height of the crystallizer), and horizontal continuous casting is carried out using the casting parameters to gradually reach the normal billet drawing speed, and finally the horizontal continuous casting speed is adjusted to 100-250mm / min.

[0067] In the utility model, according to production needs, the metal melt can be continuously added to the intermediate holding furnace, and the sheet strip billet side can continuously produce billet coils until the horizontal continuous casting is completed.

[0068] In the following embodiments, the calculation method of the proportion of the tin-rich phase is:

[0069] The metallographic statistical software Image-Pro Plus was used to count the total area of ​​the tin-rich phase in each metallographic photograph, and then divided it by the total area of ​​the entire metallographic photograph. The obtained value was the proportion of the tin-rich phase. At least 5 photos of the sample under each parameter were counted and the average value was calculated.

[0070] Example 1

[0071] This embodiment provides an instantaneous strong peak magnetic pulse assisted plate and strip horizontal continuous casting crystallizer, such as Figure 1 , 2 As shown, the crystallizer includes a cooling system, a graphite crystallizer inner sleeve and a transient magnetic pulse generator;

[0072] The inner sleeve of the graphite crystallizer comprises an inner sleeve upper plate (2-6), an inner sleeve lower plate (2-4) and an inner sleeve side strip (not shown); the inner sleeve upper plate (2-6), the inner sleeve lower plate (2-4) and the inner sleeve side strip together enclose a crystallization channel, the size of the crystallization channel is 440×16 mm, and the materials of the inner sleeve upper plate (2-6), the inner sleeve lower plate (2-4) and the inner sleeve side strip are all selected from three-high graphite; the material of the crystallizer shell near the inlet side of the crystallization channel is selected from heat-insulating filling material (1-6), and a sealing heat-resistant material layer (aluminum silicate asbestos pad) (2-11) is provided between the contact surface of the crystallizer shell near the inlet side of the crystallization channel and the intermediate insulation furnace on the horizontal continuous casting platform, and the sealing heat-resistant material layer (2-11) is padded between the graphite crystallizer and the intermediate insulation furnace when the graphite crystallizer is installed on the horizontal continuous casting platform, therefore, Figure 1 The above shows the heat insulation filling material (1-6); the crystallization channel is sealed by the slab ingot (2-5) and the coated paper;

[0073] The cooling system comprises an upper water-cooled copper mold (2-7) and a lower water-cooled copper mold (2-2) respectively arranged in contact with the inner sleeve upper plate (2-6) and the inner sleeve lower plate (2-4), and a crystallizer shell (1-2) is provided with water inlets and outlets communicating with the upper water-cooled copper mold (2-7) and the lower water-cooled copper mold (2-2), namely, an upper water-cooled copper mold water inlet and outlet (1-3) and a lower water-cooled copper mold water inlet and outlet (2-1);

[0074] The upper water-cooled copper mold (2-7), the lower water-cooled copper mold (2-2), the inner sleeve upper plate (2-6), the inner sleeve lower plate (2-4) and the crystallizer shell (1-2) are enclosed to form a cavity; the instantaneous magnetic pulse generator (2-10) is arranged in the cavity near the front position of the solid-liquid interface of the metal melt, and is in contact with the side walls of the upper water-cooled copper mold and the lower water-cooled copper mold; the other space in the cavity is filled with a heat-insulating filling material (1-6); the thickness of the heat-insulating filling material between the crystallizer shell on the side close to the entrance of the crystallization channel and the instantaneous magnetic pulse generator (2-10) is ≥45 mm; the heat-insulating filling material (1-6) is chalk or clay.

[0075] The instantaneous magnetic pulse generator (2-10) comprises a cooling water jacket and a waterproof wire group, the cooling water jacket comprises an inner cavity for housing the waterproof wire group and a cooling channel for cooling water circulation, the outer shell of the crystallizer is provided with an excitation coil terminal (1-4) and a water inlet and outlet communicated with the cooling channel, namely a generator water cooling inlet (1-1) and a generator water cooling outlet (1-5); the waterproof wire group is connected to an instantaneous strong peak magnetic pulse power supply via the excitation coil terminal (1-4).

[0076] Example 2

[0077] This embodiment provides a horizontal continuous casting method, which utilizes the instantaneous strong peak magnetic pulse to assist the plate and strip horizontal continuous casting crystallizer described in Example 1; the alloy cast by the method is a bronze alloy;

[0078] The method comprises the following steps:

[0079] S1: cooling water is sent into the cooling channels of the upper water-cooled copper mold (2-7), the lower water-cooled copper mold (2-2) and the cooling water jacket, so that the water pressure of the cooling water in the cooling channels of the water-cooled copper mold, the lower water-cooled copper mold and the cooling water jacket reaches a preset value of 0.4 MPa; an instantaneous strong peak magnetic pulse power supply is turned on, and the pulse voltage is adjusted to 400 V and the pulse frequency to 2.5 Hz;

[0080] S2: Connect the crystallizer to the intermediate insulation furnace on the horizontal continuous casting platform, so that the molten metal (temperature is 1185-1195°C) in the intermediate insulation furnace flows into the crystallization channel of the crystallizer; use a billet drawing machine to draw the billet (the billet drawing speed is 100-250mm / min), in the direction from the outlet of the crystallization channel to the inlet of the crystallization channel, the front end of the slab ingot (2-5) is the slab, the metal liquid-solid two-phase region and the molten metal in sequence, and the instantaneous strong peak magnetic pulse emitted by the instantaneous magnetic pulse generator (2-10) acts on the solid-liquid interface front of the molten metal until the horizontal continuous casting is completed to obtain the slab.

[0081] The bronze alloy treated by the method of this embodiment has a significant refinement effect. The average aspect ratio of the columnar crystals in the bronze plate and strip is reduced from 3.22 mm without applying a magnetic pulse to 1.64 mm, and the average width of the columnar crystals is reduced from 2.56 mm to 2.1 mm, and the width of the columnar crystals is reduced by 18.0%. The dendrites in the microstructure of the plate and strip become denser, the dendrite spacing is significantly reduced, and the reverse segregation is significantly improved. Compared with the horizontal continuous casting of the plate and strip without applying a magnetic pulse, the proportion of tin-rich phases in the organization on both sides is reduced by 29.5%.

[0082] Example 3

[0083] The difference between this embodiment and embodiment 2 is only that:

[0084] The pulse voltage is 300V and the pulse frequency is 5Hz;

[0085] The bronze alloy treated by the method of this embodiment has a significant refinement effect. The average aspect ratio of the columnar crystals in the bronze plate and strip is reduced from 3.22 mm without applying a magnetic pulse to 2.76 mm, and the average width of the columnar crystals is reduced from 2.56 mm to 1.91 mm, and the width of the columnar crystals is reduced by 33.2%. The dendrites in the microstructure of the plate and strip become denser, the distance between the dendrites is significantly reduced, and the reverse segregation is significantly improved. Compared with the horizontal continuous casting of the plate and strip without applying a magnetic pulse, the proportion of tin-rich phases in the organization on both sides is reduced by 56.66%.

[0086] The results of the embodiments show that for the horizontal continuous casting methods of Examples 2 and 3, what is important is the design of the crystallizer and the matching of process parameters. The crystallizer of the utility model is improved and innovated on the basis of the existing copper and aluminum alloy horizontal continuous casting plate and strip crystallizers and the previous semi-continuous casting crystallizers of non-ferrous alloys of this research group, and through the matching of process parameters such as casting temperature (the temperature before the metal melt flows into the crystallization channel of the crystallizer), cooling water intensity and casting speed (the speed of billet drawing), a copper alloy and aluminum alloy plate and strip billet with significant alloy refinement effect, significantly reduced average aspect ratio of plate and strip columnar crystals, obvious equiaxed trend, denser dendrites in the microstructure, significantly reduced dendrite spacing, and significantly improved reverse segregation is obtained.

[0087] The various embodiments of the utility model have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. An instantaneous strong peak magnetic pulse assisted plate and strip horizontal continuous casting crystallizer, characterized in that: The crystallizer includes a cooling system, a graphite crystallizer inner sleeve and a transient magnetic pulse generator; The inner sleeve of the graphite crystallizer comprises an inner sleeve upper plate, an inner sleeve lower plate and an inner sleeve side strip; the inner sleeve upper plate, the inner sleeve lower plate and the inner sleeve side strip together enclose a crystallization channel; The cooling system comprises an upper water-cooled copper mold and a lower water-cooled copper mold respectively arranged in contact with the inner sleeve upper plate and the inner sleeve lower plate, and a water inlet and outlet communicating with the upper water-cooled copper mold and the lower water-cooled copper mold are arranged on the outer shell of the crystallizer; The upper water-cooled copper mold, the lower water-cooled copper mold, the inner sleeve upper plate, the inner sleeve lower plate and the crystallizer shell form a cavity, and the transient magnetic pulse generator is arranged in the cavity near the front position of the solid-liquid interface of the metal melt, and is in contact with the side walls of the upper water-cooled copper mold and the lower water-cooled copper mold; the other space in the cavity is filled with a heat-insulating filling material; The transient magnetic pulse generator comprises a cooling water jacket and a waterproof wire group, wherein the cooling water jacket comprises an inner cavity for sheathing the waterproof wire group and a cooling channel for cooling water to flow.

2. The instantaneous strong peak magnetic pulse assisted plate and strip horizontal continuous casting crystallizer according to claim 1 is characterized in that: The size of the crystallization channel is (400-500)×(15-17) mm.

3. The instantaneous strong peak magnetic pulse assisted plate and strip horizontal continuous casting crystallizer according to claim 1, characterized in that: The materials of the inner sleeve upper plate, the inner sleeve lower plate and the inner sleeve edge strip are all made of three-high graphite.

4. The instantaneous strong peak magnetic pulse assisted plate and strip horizontal continuous casting crystallizer according to claim 1, characterized in that: The material of the crystallizer shell near the inlet side of the crystallization channel is selected from heat-insulating filling material, and a sealing heat-resistant material layer is arranged between the contact surface between the crystallizer shell near the inlet side of the crystallization channel and the intermediate insulation furnace on the horizontal continuous casting platform.

5. The instantaneous high peak magnetic pulse assisted plate and strip horizontal continuous casting crystallizer according to claim 4, wherein: The sealing heat-resistant material layer is one of aluminum silicate asbestos pad, high-temperature resistant aluminum silicate asbestos fiber felt and high-temperature resistant heat-insulating rock wool.

6. The instantaneous high peak magnetic pulse assisted plate and strip horizontal continuous casting crystallizer according to claim 1, characterized in that: The crystallization channel is sealed by using a slab ingot and coated paper.

7. The instantaneous strong peak magnetic pulse assisted plate and strip horizontal continuous casting crystallizer according to claim 1, characterized in that: The thickness of the heat-insulating filling material between the shell of the crystallizer on the inlet side of the crystallization channel and the transient magnetic pulse generator is ≥45 mm; The thermal insulation filling material is chalk or clay.

8. The instantaneous high peak magnetic pulse assisted plate and strip horizontal continuous casting crystallizer according to claim 1, characterized in that: The shell of the crystallizer is provided with excitation coil terminals and water inlet and outlet communicated with the cooling channel; the waterproof wire group is connected to the instantaneous strong peak magnetic pulse power supply through the excitation coil terminals.

9. The instantaneous strong peak magnetic pulse assisted plate and strip horizontal continuous casting crystallizer according to claim 1, characterized in that: The waterproof wire group is wound by waterproof flat copper wire with a cross-sectional size of (2-3)×(6-7) mm, a height of 70-100 mm, and a total number of turns of 150-350; The material of the cooling water jacket is paramagnetic heat-resistant stainless steel with a thickness of 1.5-2 mm.

10. The instantaneous high peak magnetic pulse assisted plate and strip horizontal continuous casting crystallizer according to claim 9, wherein: The paramagnetic heat-resistant stainless steel is one of 316L stainless steel, 320 stainless steel and 316 stainless steel.

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