A wide magnesium alloy multi-stage split flow coupled staggered electromagnetic field casting nozzle structure

Abstract

The application discloses a wide magnesium alloy multi-stage flow coupling staggered electromagnetic field casting and rolling nozzle structure and belongs to the technical field of casting and rolling processing. The wide magnesium alloy multi-stage flow coupling staggered electromagnetic field casting and rolling nozzle structure comprises an upper cover plate and a lower shell arranged below the upper cover plate, a closed surrounding casting nozzle cavity is formed between the upper cover plate and the lower shell, a melt overflow space is formed in the casting nozzle cavity, a plurality of neat sliding rails are arranged above the upper cover plate and below the lower shell, and staggered magnetic pole electromagnetic generating devices are slidably connected to the sliding rails. The wide magnesium alloy multi-stage flow coupling staggered electromagnetic field casting and rolling nozzle structure is used to introduce a dynamic magnetic field through the arc-shaped gradually expanding inlet and the multi-stage flow block in cooperation with the external excitation coil, so that the melt purity and the uniformity of the structure are improved, and the melt flow is optimized.

Description

Technical Field

[0001] This invention relates to the field of casting and rolling processing technology, and in particular to a casting nozzle structure for a wide-width magnesium alloy with multi-stage split-coupled interlaced electromagnetic fields. Background Technology

[0002] Magnesium alloy casting and rolling technology boasts advantages such as short process, high efficiency, high overall yield, and low cost, making it widely recognized as the most ideal method for preparing magnesium alloy sheets and strips. However, during the casting and rolling of wide-width magnesium alloy sheets and strips, uncontrollable multiphase flow and non-equilibrium solute segregation in the casting nozzle area lead to defects such as uneven longitudinal extension of the magnesium alloy melt as it passes through the roll gap, uneven slab microstructure distribution, and segregation, significantly reducing the sheet yield. This severely restricts the industrialization of magnesium alloy casting and rolling. Traditional wide-width magnesium alloy casting nozzles, relying solely on flow-dividing structures, cannot effectively address the issues of uneven flow field and solute distribution in wide-width casting nozzles. Summary of the Invention

[0003] The purpose of this invention is to provide a casting nozzle structure for wide-width magnesium alloys with multi-level splitting coupled interlaced electromagnetic fields. Based on the multi-level splitting structure, a directional electromagnetic oscillation field is introduced, which effectively solves the problems of uneven flow field and solute distribution in wide-width casting nozzles, and is beneficial to reducing edge cracks, refining grains, homogenizing the microstructure, and reducing macroscopic segregation in magnesium alloys.

[0004] To achieve the above objectives, the present invention provides a casting nozzle structure for a wide-range magnesium alloy multi-stage split coupling interlaced electromagnetic field, including an upper cover plate and a lower shell disposed below the upper cover plate. The upper cover plate and the lower shell form a closed surrounding cavity for the casting nozzle. A melt flow space is formed inside the casting nozzle cavity. Several neatly arranged slide rails are provided above the upper cover plate and below the lower shell. Interlaced magnetic pole electromagnetic generating devices are slidably connected to the slide rails.

[0005] Preferably, the melt flow space is provided with two open ends, namely the magnesium alloy solution inlet end and the magnesium alloy solution outlet end.

[0006] Preferably, the lower housing has an arc-shaped gradually expanding inlet on the side near the magnesium alloy solution inlet, and a primary flow divider block and a secondary flow divider block are provided above the lower housing. The primary flow divider block and the secondary flow divider block are sequentially arranged on the side of the arc-shaped gradually expanding inlet away from the magnesium alloy solution inlet.

[0007] Preferably, there are 3 primary diversion blocks and 7 secondary diversion blocks, and both the primary and secondary diversion blocks are arranged in two rows and staggered.

[0008] Preferably, the primary diverter block is configured as a near-rectangular structure, and the two corners of the primary diverter block near the arc-shaped gradually expanding inlet are both configured as rounded corners; the secondary diverter block is configured as a near-rhomboid structure.

[0009] Preferably, the upper cover plate, the lower shell, the arc-shaped gradually expanding inlet, the primary diverter block, and the secondary diverter block are all made of SiC-SiN composite material and are bonded together with high-temperature adhesive to form a wear-resistant and high-temperature resistant main structure, and the inside of the casting nozzle cavity is coated with a high-temperature anti-oxidation coating.

[0010] Preferably, the radius of curvature of the inlet section of the arc-shaped gradually expanding inlet is R=0.8L, where L is the width of the casting nozzle.

[0011] Preferably, the alternating magnetic pole electromagnetic generator includes a base and an end cover. The end cover is disposed above the base, and a slider is disposed below the base. An oil inlet and an oil outlet are disposed on one side of the base. A plurality of coil fixing slots are disposed at equal intervals inside the base, and an excitation coil is disposed in each of the coil fixing slots.

[0012] Preferably, the alternating magnetic pole electromagnetic generator is made of a high permeability material.

[0013] Preferably, the excitation coil is made of multiple layers, and opposite currents are passed through adjacent excitation coils to form an NSNS alternating magnetic pole array.

[0014] Therefore, the casting nozzle structure of the wide-range magnesium alloy multi-stage split coupling interlaced electromagnetic field described above has the following beneficial effects:

[0015] (1) A dynamic magnetic field is introduced by using an arc-shaped gradually expanding inlet and a multi-stage shunt block in conjunction with an external excitation coil (with alternating current directions) to improve the purity and uniformity of the melt and optimize the melt flow.

[0016] (2) Based on the need for coordinated control of multi-physical field coupling (flow field-temperature field-electromagnetic field), a "two-level partitioned flow guidance + electromagnetic disturbance" casting nozzle structure is proposed, which can break through the technical bottleneck of uneven melt flow and frequent solidification defects in traditional wide-width casting nozzles, and provide theoretical basis and technical support for the short-process preparation of high-performance magnesium alloy thin strips.

[0017] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] Figure 1 This is a schematic diagram illustrating the functional position of the casting nozzle structure and the casting process according to an embodiment of the present invention;

[0019] Figure 2This is a schematic diagram of a casting nozzle structure for a wide-range magnesium alloy multi-stage split coupling interlaced electromagnetic field according to an embodiment of the present invention;

[0020] Figure 3 This is a cross-sectional view of the flow divider block according to an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of an explosion of the interlaced magnetic pole electromagnetic generator according to an embodiment of the present invention;

[0022] Figure 5 This is a structural diagram of a casting nozzle structure for a wide-range magnesium alloy multi-stage split-coupled interlaced electromagnetic field according to an embodiment of the present invention;

[0023] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0024] Figure 7 This is a simplified schematic diagram of an alternating electromagnetic oscillation field according to an embodiment of the present invention;

[0025] Figure 8 This is a simulated cloud diagram of the exit velocity of the casting nozzle according to an embodiment of the present invention;

[0026] Figure 9 This refers to the solute element concentration in the thickness direction of the slab in this embodiment of the invention.

[0027] Figure Labels

[0028] 1. Interlaced magnetic pole electromagnetic generator; 2. Upper cover plate; 3. Secondary shunt block; 4. Primary shunt block; 5. Lower housing; 6. Arc-shaped gradually expanding inlet; 7. Coil fixing slot; 8. End cover; 9. Excitation coil; 10. Oil inlet; 11. Oil outlet; 12. Slider; 13. Slide rail. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] Example

[0032] like Figure 2 As shown, the present invention provides a casting nozzle structure for a wide-range magnesium alloy multi-stage split coupling interlaced electromagnetic field, including an upper cover plate 2 and a lower shell 5 disposed below the upper cover plate 2. The upper cover plate 2 and the lower shell 5 enclose and surround each other to form a casting nozzle cavity. High-temperature magnesium alloy melt flows in from one end of the casting nozzle cavity and flows out from the other end.

[0033] The interior of the casting nozzle cavity forms a melt flow space with two open ends: an inlet and an outlet for the magnesium alloy solution. An arc-shaped, gradually expanding inlet 6 is located on the side of the lower shell 5 near the magnesium alloy solution inlet. A primary flow divider 4 and a secondary flow divider 3 are positioned above the lower shell 5, sequentially arranged on the side of the arc-shaped, gradually expanding inlet 6 away from the magnesium alloy solution inlet. There are three primary flow dividers 4 and seven secondary flow dividers 3, arranged in two rows with an alternating pattern. Figure 3 .

[0034] The primary flow divider 4 is designed as a near-rectangular structure, arranged in two staggered rows. The two corners of the primary flow divider 4 near the arc-shaped gradually expanding inlet 6 are both designed as rounded corners, that is, the two corners are semi-circular ends, which smoothly transition with the rectangular body and can effectively reduce the flow resistance of the melt.

[0035] The secondary flow divider 3 is designed with a near-rhomboid structure, with two rows of parallel arrays arranged in an alternating pattern to extend the melt path and enhance the uniformity of the transverse flow velocity.

[0036] The upper cover plate 2, lower shell 5, arc-shaped gradually expanding inlet 6, primary diverter block 4, and secondary diverter block 3 are all made of SiC-SiN composite material and are bonded together with high-temperature adhesive to form a wear-resistant and high-temperature resistant main structure. The inside of the cast-rolled nozzle cavity is coated with a high-temperature anti-oxidation coating to enhance corrosion resistance.

[0037] The radius of curvature of the inlet section of the arc-shaped gradually expanding inlet 6 is R=0.8L (L is the width of the casting nozzle), which reduces the inlet turbulence intensity, realizes the smooth flow of turbulent melt to laminar flow, avoids turbulent slag entrainment, eliminates turbulence, and realizes the smooth diffusion of melt to the first-stage diversion block 4 region.

[0038] Several neatly arranged slide rails 13 are provided above the upper cover plate 2 and below the lower housing 5. An alternating magnetic pole electromagnetic generator 1 is slidably connected to each slide rail 13. (Refer to...) Figure 4The alternating magnetic pole electromagnetic generator 1 includes a base and an end cover 8. The end cover 8 is located on top of the base, and a slider 12 is located below the base. The alternating magnetic pole electromagnetic generator 1 is fixed to the base via a slide rail 13 to ensure stable operation of the device and reduce the impact of vibration on the melt flow. An oil inlet 10 and an oil outlet 11 are provided on one side of the base. Several coil fixing slots 7 are evenly spaced inside the base, and each coil fixing slot 7 contains an excitation coil 9. The equidistant arrangement of the coil fixing slots 7 ensures the stable operation of the excitation coil 9.

[0039] The staggered magnetic pole electromagnetic generator 1 uses a high magnetic permeability material, which can ensure a uniform distribution of the magnetic field, improve the control effect of the electromagnetic field on the melt flow, and optimize the casting and rolling quality.

[0040] Reference Figures 5-6 Both slider 12 and slide rail 13 are set as T-shaped structures and they cooperate with each other.

[0041] The excitation coil 9 employs a multi-layer winding process, with equidistant coils positioned in the coil's positioning slots. Opposite currents are passed through adjacent excitation coils 9 on the left, right, and top and bottom, forming an alternating NSNS magnetic pole array. This array, in conjunction with the flow channel within the casting nozzle, regulates the magnesium alloy melt. (Refer to...) Figure 7 .

[0042] The components of the casting nozzle structure described in this paper are fitted with high precision to ensure sealing and prevent molten leakage.

[0043] Specifically, the working process of this embodiment is as follows:

[0044] Magnesium alloy casting and rolling process, such as Figure 1 As shown, the high-temperature magnesium alloy melt flows into the lower shell 5 and the upper cover plate 2 through the inlet, forming a casting nozzle cavity. The inlet turbulence is initially reduced by the arc-shaped, gradually expanding inlet 6, allowing the melt to smoothly transition to the first-stage flow divider 4. The first-stage flow divider 4 effectively reduces the melt flow resistance, and the second-stage flow divider 3 further evenly distributes the melt. Under the action of the staggered magnetic pole electromagnetic field, the melt undergoes periodic strong shear flow, significantly enhancing the solute diffusion coefficient and effectively suppressing macroscopic segregation between dendrites. This allows for precise control of melt flow and solute segregation (e.g., Figures 8-9 As shown in the figure, it eventually flows out from the outlet to form a high-quality magnesium alloy casting. Figure 8 This is a velocity simulation diagram of various points at the cross-section of the casting nozzle exit after the improvement of this invention. Figure 9 The invention demonstrates the improvement in melt solute segregation in the thickness direction of the slab.

[0045] Therefore, the present invention adopts the above-mentioned casting nozzle structure of a wide-range magnesium alloy multi-stage split coupling interlaced electromagnetic field. By combining structural optimization with an electromagnetic oscillation system, the problems of uneven melt distribution, high defect rate and low efficiency of traditional casting nozzles are solved, and the quality and production efficiency of magnesium alloy castings are improved.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A casting nozzle structure for a wide-range magnesium alloy multi-stage split-coupled interlaced electromagnetic field, characterized in that: The application relates to a casting and rolling nozzle device, which comprises an upper cover plate and a lower shell arranged below the upper cover plate, a closed surrounding casting and rolling nozzle cavity is formed between the upper cover plate and the lower shell, a melt flow space is formed in the casting and rolling nozzle cavity, a plurality of sliding rails are arranged on the upper cover plate and the lower shell, staggered magnetic pole electromagnetic generating devices are slidably connected to the sliding rails, the melt flow space is provided with two open ends, i.e. a magnesium alloy solution inlet end and a magnesium alloy solution outlet end, an arc-shaped gradually-expanded inlet is arranged on one side of the lower shell close to the magnesium alloy solution inlet end, a primary flow dividing block and a secondary flow dividing block are arranged above the lower shell, and the primary flow dividing block and the secondary flow dividing block are sequentially arranged on one side of the arc-shaped gradually-expanded inlet away from the magnesium alloy solution inlet end. The curvature radius R of the inlet section of the arc-shaped gradually-expanded inlet is 0.8L, wherein L is the width of the casting and rolling nozzle. The staggered magnetic pole electromagnetic generating device comprises a base and an end cover, the end cover is arranged above the base, a sliding block is arranged below the base, an oil inlet and an oil outlet are arranged on one side of the base, a plurality of coil fixing grooves are equidistantly arranged in the base, and excitation coils are arranged in the coil fixing grooves. The excitation coils are formed by multi-layer winding, opposite currents are input into adjacent excitation coils, and an N-S-N-S alternating magnetic pole array is formed.

2. The structure of a wide magnesium alloy multi-stage split flow coupled staggered electromagnetic field casting and rolling nozzle according to claim 1, characterized in that: The primary flow dividing block is arranged as three pieces, the secondary flow dividing block is arranged as seven pieces, the primary flow dividing block and the secondary flow dividing block are arranged as two rows and staggered.

3. The structure of a wide magnesium alloy multi-stage split flow coupled staggered electromagnetic field casting and rolling nozzle according to claim 2, characterized in that: The primary flow dividing block is arranged as a near-rectangular structure, two corners on one side of the primary flow dividing block close to the arc-shaped gradually-expanded inlet are arranged as rounded corner structures, and the secondary flow dividing block is arranged as a near-rhombic structure.

4. The structure of a wide magnesium alloy multi-stage split flow coupled staggered electromagnetic field casting and rolling nozzle according to claim 3, characterized in that: The upper cover plate, the lower shell, the arc-shaped gradually-expanded inlet, the primary flow dividing block and the secondary flow dividing block are all made of SiC-SiN composite materials, are bonded by high-temperature glue to form a wear-resistant and high-temperature-resistant main structure, and the casting and rolling nozzle cavity is coated with a high-temperature oxidation-resistant coating.

5. The structure of a wide magnesium alloy multi-stage split flow coupled staggered electromagnetic field casting and rolling nozzle according to claim 1, characterized in that: The staggered magnetic pole electromagnetic generating device is made of high-magnetic-conductivity material.

Images