TW200533437A - Electromagnetic stirring method for the continuous casting of flat metal products - Google Patents

Abstract

During a continuous slab casting operation, in which the molten metal is introduced into a mould (1) via a submerged nozzle (4) having lateral discharge outlets (5,5') opening towards the small walls (3,3'), the stirring according to the invention uses moving magnetic fields that act, in pairs, at least in the secondary cooling zone of the casting plant, by travelling collinearly between them in opposite directions so as to forcibly establish a middle longitudinal circulation in the liquid pool as two opposing collinear streams, which produce an global movement in the form of a "four-leaf clover", the upper lobes (L1, L4) of which extend into the mould to near the discharge jets 7, 7' coming from the outlets of the nozzle, in order to brake the said jets or to accelerate them, as required. The invention provides overall stirring of the metal over the metallurgical length, thereby ensuring both thermal an chemical uniformity between the top and bottom of the liquid pool without correspodingly being deprived of the beneficial effects specific to stirring in the mould and in the secondary cooling zone respectively, and without disturbing, but rather steadying, the local flow mode in the mould.

Description

200533437 IX. Description of the invention: [Technical field to which the invention belongs] The present invention relates to metals, especially to flat products (that is, those with a slender section, to be more precise, there is a special distribution of metal hydraulics. [Previous technology] is steel Continuous casting. In particular, electromagnetic stirring during casting, and even the use of an external magnetic field in the body to establish a flow. "It means that the small pieces are thin and thin. So you should understand the general saying" the product of the slender section is at least twice the thickness. Metallurgical products, especially slabs, slabs, etc. Appeared in the field of continuous steel casting in the early 1970s, electromagnetic stirring has quickly determined that it is almost an essential tool for controlling the flow in the liquid pool during solidification. The commonly used principle is Gu D (Magnetohydrodynamics), which is well known to me. It uses the movement generated by a multi-phase reactor placed adjacent to the casting, or generally a plurality of multi-phase sensors. (Rotation ^ = advance) The magnetic field drives the liquid metal with its displacement. These inductors, which are suitably located at two degrees of gold per die, are supplied with an adjustable frequency current to increase the frequency. Various mixing modes that match the requirements of metallurgical workers. Furthermore, for the continuous understanding of the metal solidification mechanism during continuous casting, it has been shown that the cyclic movement of liquid metal for the overall quality of the final solidified product (that is, the internal soundness) , Surface cleanliness or absence of inclusions: chemical structure, etc.) ^ In this regard, the capacity applied to the molten metal during continuous casting can be roughly divided into two types, depending on what we consider Is the mold or the secondary cooling section of the casting machine below 200533437. At the height of the liquid part of the casting metal pole, the movement of the liquid metal in the mold is essentially used to control the flow in this critical area To be more precise, the free surface of the cast metal is found in this system, and the cleanliness of the cast metal depends on the geometry of this surface. This is also the place where the pre-cured surface layer is produced, and we are already familiar with its quality and surface quality of the final casting. The control of each manufacturing process itself is very important. On the other hand, by stirring the liquid pool under the mold Is a metal in the secondary cold zone (usually referred to as the "secondary zone"). The first purpose of this purpose is to improve the internal metallographic structure of the casting through the development of maximum isometric solidification. This is known to be beneficial. In e.g. He Jinfen.

π〗 The micro-segregation of the iTC element and the central pores in the casting. Because Λ ', whenever it is necessary to produce an internal structure that does not contain voids, for example, when manufacturing thick plates for steel furnaces or large-scale welding, electromagnetic stirring is increasingly used for continuous casting of slabs. , τ π π < Catch no, as the following Shu Mingzhi 'I have been well known as taken from the document French patent case number 72/20546 ^ The figure shown in Figure 3 is in the secondary cooling zone of the Bankan continuous casting machine The linear sensors M and M placed on the two sides of the large casting wall of the casting to face each other are used to generate a magnetic field that moves across the entire width of the product. This purpose is to establish the flow of two adjacent% paths that are essentially smoke screens in the liquid metal and turn into opposite directions in this way. These loops 42, outer 1-, -... 43 are flat hit on the large casting wall and are common in the driving force of the magnetic field, and it is known that 'long to both sides of b, along the casting, the flow of each loop The system descends along the small cast wall of the sheep. This kind of sports shape is relatively known as Γ butterfly wing shape. 200533437 As excerpted from Figure 4 of the French Patent Case No. 82 / Deleted Document 4, the magnetic field driving effect can be increased depending on the length of the scale making machine. # = 二 Γ, the area is closest to the pair Adjacent rings: i to stir the known available stirring power capacity. Therefore, 魈 & "one * taking X's A can generate a pattern flow with a shape of" 2020 "is paired and reversed. Formed by two adjacent loops of rotation, that is, a plate-direction driving area 5 1 and 52 # _ >ρ; ζ 扪 甲 央 ％ 路 00, and two outer loops 61 which rotate in the same direction on the central side And 62. Regardless of the implementation status of the two, Yilu, the support wheels of the secondary cooling zone of the casting machine described above can still be between the wheels of the crying wheel of the national patent case No. 0547 (French patent case number 72/20546) The tool of the present invention is as follows: It is applied to the historical point of view and found that this kind of ring-based motion is different from the long product. 产品 r > Metal recycling The U 4 ^ road system is built on the parallel plane of toilet 刼 a. It seems that the products of continuous cross-sectioning of the long section of the flat two of the large prayer wall are not suitable for establishing the pair :: Cheng, fine. The main reason may be this. For the speed gradient of the fact that the product moves, this thickness needs to be twenty centimeters larger than +. For the production of °°, it hardly exceeds approximately. However, the large-scale casting of the multi-stage loop products shown in Figures 3 and 4 It develops over the entire metallurgical length parallel to the wall. It is tied to obstacles such as production. In addition, it also has the advantages of cross-linking, such as, good heat exchange with a protective surface. From the old. And the bottom. The area is more ... It is driven downward by the forced convection of the downward flow 200533437 and 42a and 43b, and the rising flow injury and the crystallites of the solidified metal that he has sowed at the bottom have been planted at the top, which is beneficial to the initial development of the whole from the periphery of the casting directly to the center Uniform equiaxed curing. However, because of the risk of disturbing the free surface of the metal in the mold, these loops 42 43 cannot be developed too strongly near the top I hope. Month) have to make the existing ones What fine degree of hydrodynamic balance is maintained by the in-mold flow at the south of the mold to obtain a good quality casting surface, sub-surface layer and core. Precisely, the use of an immersion nozzle with a lateral discharge hole with a small turning wall of the prayer mold allows the metal to be cast to be introduced through the top of the mold. In fact, it has now become a replacement for the long products that are actually taken for granted. General example of straight nozzle with axial discharge. The main advantage obtained through the flow in the mold is that 'as shown in the attached figure 1, the rebound effect on the small casting wall of the mold is used, and then each lateral hole 27, 27 from the nozzle 26 is made, The hot liquid metal jet naturally diffuses into two parts. The main part 21 is guided downward in the direction in which the casting is withdrawn. The other part 22 is folded back in order to provide the enthalpy required to prevent the solidification of the cast metal at the meniscus near the free surface 23 of the mold metal. This phenomenon is often the reason for the abrupt stop of the casting process. This purpose is to create a circulation pattern called "double loop" in the mold in this way, instead of "single loop" mode. The latter mode shown in Fig. 7 first shows the phenomenon that the metal rises to the meniscus after it is discharged from the nozzle outlet ', which often causes argon injection to prevent the nozzle from being blocked by the casting feed tank located above it. This first strand rises upward and then extends from the surface flow to each of the small cast walls, and then flows downward along the latter's lower 200533437. With this method, the speed map is quickly established in the mold, and the speed is usually towards production. Zhanshan ^ "The direction drawn from the entrance of the house is used to guide downwards in the case where the loop 22 above the meniscus does not exist ....," belongs to, _ =, as long as the conversion conditions (town Production speed, board interest width, rotation ... degrees, anti-blocking argon flow rate, etc.) are suitable to maintain "double loop, heart 1 will

"... 々" style. If these conditions change, the arbitrary transformation A and formula can appear in the actual casting process, which is consistent with the general situation. Only ^ In addition, the main feature of the "double loop" & motion in the control mold is to maintain the recirculation movement in the mold at the meniscus on both sides of the nozzle. "= Hold known: left and right" asymmetry occurs as a vibrating metal bath Second: The undulating surface that the operator knows, this is the part standing on the casting platform and repeats the "scrutiny" to ensure the stability of the clothes machine 22, 22 ', especially near the top, in the entire process to avoid " The "left and right" asymmetry occurs. Miscellaneous workmanship: The silicon AA intensive rising cycle can fully and effectively transfer the heat of the stem to the cold and cold v-bow level, but it must not be too strong from the perspective of fluid dynamics to avoid problems. For all disasters, the first curing line 25 is formed, which is formed near the boundary of the liquid level of the win. The entire degree of this initial curing line is always a guarantee of the uniformity of the initial surface layer at the top of the mold. Without this guarantee, there must be slag crusting under the casting length ~ change Or the risk of casting leakage caused by local thinning of the solid surface layer thickness. To put it more simply, the transformation of the submerged spray bird that can be buried from the side of the idler sword to the discharge hole on both sides of the appliance can be made at any time ~, 7 kinds of ^ 仏 known works, or Under any circumstances that do not meet the needs of 3, 4 Yu brothers to the double-loop "or" single-loop "10 200533437 in-mold flow 0 or the instability caused by" left and right "asymmetry is particularly It is because of this problem that the life is controlled in the top area of the control # 丨 flame casting machine, so the electromagnetic stirring system ^-11 is a lateral jet of the nozzle. For example, & Mu Zi ^ Excerpt from the file of this patent case No. 1534 Figures 2a and 2b! si 仏-| For white, and °, the horizontal moving magnetic field is formed by the large cast wall placed on > ^ mold 32, and a + this 1 Shi / mouth test to the soil, facing the metal jet on both sides of the nozzle 31 Heterogeneous linear exhaustion occurs due to m T + ^ ^ 30a, 30b, and 3Ga ,.

The direction of the entire field can be reduced, so the metal flow of νΜ · 乂 J 便 3 can be decelerated (the field is moved backward by the nozzle Γ ^ + j ^ wall + force (Figure 2bi)), or it can be accelerated in the opposite direction (Ihe The mouth moves in the same direction in the direction of the small cast wall (head 2b2)). In principle, this is to provide, for example, the amount of enthalpy of the cast metal surface to be adjusted according to the casting conditions without excessively disturbing the in-mold flow pattern that must be maintained preferentially. ^ Therefore, the quick review of the above prior art clearly shows that if there is no Okita ~ a piece with an elongated cross section (such as a flat product), on the one hand, the metal stirring in the prayer ^ and the stirring in the secondary cooling zone The difference between them. SUMMARY OF THE INVENTION An object of the present invention is specifically to overcome such obstacles. Change_ The method is suitable for continuous casting of flat products, especially for slabs. The purpose of this month is to plan and remove the molten metal over the entire metallurgical length in the secondary cooling zone. It provides good exchange between the metal and the mold in two directions. In this way, it is natural to achieve the heat and internal flow mode between the top and bottom of the liquid casting gold 11 200533437. It will not cause phase loss when possible: two: it will not interfere with the mold stirring and lose the individual cooling mold in the secondary cooling zone Inner heart ... Cumulative and beneficial effect peculiar to simmering. The additional purpose of this note is to help improve the inherent quality of steel grade metallurgical products, such as ferrous stainless steel, ferrous grain iron stainless steel, or galvanized steel. Da "Another additional purpose is to be able to change the household's inclination φ * / claw movement 'in the secondary zone so that the height of each stream created by spraying D is used as a gold, bird speed medium or reverse ㈣ & _ • The addition of the fork is a tool for asymmetrical movement of "production + h, otherwise, to offset the left and right movement of the golden cymbals in the mold". Μ slave achieves these objectives. The subject of the present invention is the continuous casting equipment for flat-like products. _ / Or other types <X 1 has a long-term cold electric zone 4 °, and the prepared mold is equipped with a guide mold. Small AA ^ 0/7 1,, the lateral discharge hole of the soil ... 'casting port, this mixing method is implemented using a moving magnetic field generated by an inductor, which is characterized in that the vertical grasping system is compulsorily established on this secondary In the cooling zone, there are two reverse collinear flows in the central area of the soil. It is possible to use this method to naturally build a `` four-leaf-mesh ''-shaped whole liquid in the right region of the "a leaf under the reed" in the secondary zone. ^ -Y · ^ Detention%, the fourth: a petal above the eye extends into the mold and reaches the height of the jet from the outlet. 1 According to one embodiment of the present invention, in the center of the product, the two longitudinally opposite collinear flow systems of the M 4 blades are moved separately from each other to produce two upper leaflets, and extend to the mold. The inside has reached a height of 12 200533437 degrees from the jets exiting from the discharge hole of the gate, and merges with the jets in the same direction to strengthen them. According to another implementation aspect, the two longitudinally opposite collinear flow systems that converge with each other in the central part of the product generate two upper leaflets that extend into the mold to reach a high level of jets sprayed from the discharge hole of the casting port. , Slowing them down by stacking them in reverse. According to a special specific example of this method, the placement of the longitudinal flow within KJ one-to-one ^ is towards the rod of the casting-and $ H _ the dead side or the other small casting wall is laterally displaced in order to pin the inside of the mold The "left and right" asymmetric tendency of metal movement. A genus stream according to the implementation mode is used in the central area which is closer to or separated from each other.

In this method, a collinear moving magnetic field moving longitudinally in the longitudinal gold region in the central region of the casting produces two reverse collinear flows. According to a preferred implementation aspect, the longitudinal system in the area of engraved # 巾 休 ~ 彳 千 Tcentral area is generated by the collinear moving magnetic field of the rank-wise movement on the entire width of the casting. Two reverse collinear flows that contend with each other from the edge of the casting to the center, and are closer to each other, or two reverse collinear flows that are more separated from the center of the casting to the edge. According to another, a multi-phase linear sensor with a large casting wall of the piece produces a better consistent implementation. This moving magnetic field uses the

As another embodiment, the inductors are supplied with currents of different strengths in order to change the effect on the two opposite collinear metal flows in different ways. This genus is generated by the moving magnetic field generated by these inductors. . It should be understood that the term "collinear" applied to the field movement or metal flow means /% magnetic or that the metal flow does not move parallel to each other, but instead uses two collinear vectors instead of two parallel along a straight line. Vector way to move. As already known, the main basis of the present invention lies in the secondary cooling zone. 13 200533437 This lateral branch (or if the casting axis is assumed to be vertical + cross-shaped) is produced with two lateral branches and two longitudinal branches. The width develops, while the two longitudinal "two are horizontal in the central region of the casting (usually the axial range) develop straight) the branch stream in the secondary zone of the praying machine, more precisely, leads to the recirculation flow in the liquid pool In the shape of a four-leaf :: shape ": It is to produce the overall shape movement that can also reach the range of the mold. υ To reach the present invention [Embodiment] It should be noted that Figures i i 4 are used to support this file first == description '. Therefore they will not be mentioned again later. The present invention is unique to the present invention, which uses these two methods to expand or converge the metal flow.) The moving magnetic field at the center of the stirring mode in the secondary zone is like the linear sensor 1 that generates them; ^ By thick vertical head: 1 :. The resulting convective motion itself is represented by its main path with the form of ".ir". The arrow indicates that the auspicious person in the movement of the second ceremony ^ • the area of the transmission path is subject to the moving magnetism. . The continuous line represents the active convection area, so the effect of circulation 1% of the magnetic field. The dashed line represents the recirculation zone where the passive convection is 1 and the active zone is complementary so that the motion loop is closed: when the same element is represented by the same element symbol. The necessary component symbols are used to make the main components of the present invention clearer here. 1. Each T-table must not show the continuous plate chain casting mold i, which is connected below it. 14 200533437 Unnecessarily large castings These castings are designed to be more secondary cooling zone 2 of the liquid casting machine. Here, In order not to reduce the clarity of the figure, the support wheels are not shown intentionally. Since it is viewed in a plane parallel to the scale wall, only small casting walls at 3 and 3 are seen. The walls determine the small sides 18, 18 of the casting 6. Because the large casting walls are on the surface, they are not marked with a component symbol in the figure. Furthermore, for the sake of clarity, the component symbol 6 refers to the casting slab itself or its core. Generally speaking, it is referred to as the "solidification tank ^ 174, the longitudinal axis of the budding, Xing _ coincides) in the center of the submerged nozzle 4 Moulded molten metal is provided by a trough (not shown) located above it. This nozzle is equipped with lateral discharge holes 5 and 5, respectively facing small prayer walls 3 and 3, on one side or the other. Prayer ^ The small system is determined by the inside of the mold that defines the casting space + the person T, the molten metal is in the form of a jet 7, 7, which is discharged from the outlet of the Heming 4, in the form of a conventional system, about the horizontal average direction, or Enter this _ with a slight downward slope. In this way, the casting is from the ancient itch with the meniscus 8-the top of the degree towards the extraction direction of the casting machine, along the vertical or along the curved 仏 rugged, in the positive father On the planes of these drawings, it is pushed down at the extraction rate (casting rate) of usually 4 meters per minute., ^ ^ ^. When it advances, the π mouth is caused to be internalized. First drain into the mold in contact with the cooling copper wall .... Week ^ 2, 7 'The edge gradually solidifies to the center. Please note that the length of the order (or the depth of the solidification tank) ^ M ^ VL "." (The depth of the solidification tank) is conventionally defined as A vertical line in the mold. The type of green snail AA t and the genus Tilia is from the height of the upper surface (or bow liquid surface) and the secondary cooling zone. The size between the bottom height of the square solidification tank to the bottom of the solidification tank-Qi The final solidified leading edge formed on each broad side of the casting 15 200533437 as the solidification progresses meet here. Arbitrarily set along the longitudinal axis of the product (which coincides with the casting axis A) at about 3 or 4 m below the meniscus 8, so the point inside the secondary cooling zone 2 is point P ', which is called the r-stirring cross shape " The center of 9 indicates the creation unique to the present invention. The stirring cross 9 is a cross with four branches,

These tributaries are in pairs on the same straight line, that is, forming a pair of two longitudinal (vertical) tributaries 10a, 丨 b that are aligned with the casting axis A, and form a pair of the entire width of the casting The two lateral (horizontal here) developments on the machine are 1 la and 1 lb. In each of any pair of two streams, the liquid metal stream circulates in pairs in opposite directions inside. Furthermore, the circulation flow in one pair is opposite to the other pair. Due to the definite "r" dimension of the inevitability of the castings, when these branch streams are connected together by a recirculation loop as seen, they form an overall flow that develops in the shape of a four-leaf clover on the plane of the large casting wall: It's time

It is the leaves of the wild η Gans L constituting the leaf petals LI, L2, L3, and L4, in which the upper two petals Ll extend to reach the height of the mold .... Therefore, in the mixing mode shown in the figure, it is the "expanded" convection type-all belong to the white crane fork, Meng, and the melon moves from the center point p in a manner separated from each other. One of the streams 10a faces Ί and 4 * —flows away from _die 1 above, and the other k 10b produces n toward the side of the casting. 4 * direction, the cut-off point of the solidification tank is open, so the metal convection in the horizontal band 丨 丨 a with Jing Ba M 1 b is "heavy" type-the metal flow is toward the center of the confluence, and the product is cast The wall flows to the longitudinal axis A. % Universal flow to each other 'is formed as described, the core 1L spoon mongolian flow system is generated by a moving magnetic field 16 200533437, which itself faces the large casting walls by being placed adjacent to the casting ( (Preferably on both sides). Of course, it is not necessary that both pairs of tributaries are activated simultaneously by the magnetic field. As long as one of them can be activated, such as a vertical tributary! 0a, 丨 0b, then the other tributary uai ib will naturally become a recirculation site, because the central point P is used as a flow path node to maintain the mass flow rate and movement, and vice versa. However, in this first stirring mode of the present invention, it is important that the vertical branch streams 10a and 10b flow in a manner separated from each other, as shown in Figs. 5 to 8. In the upper leaflets L1 and L4 where f is close to the mold, the metal rises along the center and descends along the small cast wall, while the opposite is true in the case of the lower leaflets L2 and L3. In these cases it has been demonstrated that the practice of the invention maximizes the liquid cell bottom to top = metal material exchange. First, the circular loop of metal in any leaflet occurs in a direction opposite to the rotation direction established by two adjacent leaflet towels. Secondly, the strength of the port 7 due to the casting jet is then regularly strengthened by the same-direction increasing spoon tongtong 10a, thereby strengthening the recirculation loop ^ .L6 near the meniscus 8 in the mold. As a result, it exists in The "dual loop" modes L5, L1, L4, and L6 in the frame are simultaneously stabilized in this way. Therefore, it should be easy to understand that if initially located in the secondary cooling zone, the liquid core Mengwu unit (conceptually isolated at any point along the metallurgical length) due to the random rise and fall of continuous flow , And there will be at least one-time Gao Jing existing in the mold before descending again, otherwise if ⑽ began to 忒 liquid evil metal unit is selected to be located in the mold, it should be understood that all units must be in the direction of extraction to be equivalent to the casting speed The average speed moves into τ and averages downward displacement. In other words, 'this embodiment of the present invention enables the prayer mold 17 200533437, and is performed by enhancing a known tool suitable for stabilizing the "double-loop type" in the mold. It is suitable to remove too much equiaxed metal ... and the initial risk, but it conceals 1 'without any wind-benefit theory that interferes with the in-mold flow mode = "left and right" symmetrical movement on both sides The stability of the model, which local model, and the "r. 4 loop" (loss, j (tea photo 5) or> π fig 6) can all be carried out, so this mode change A and this offset by Some ..., another kind of natural tendency of clutter. As already explained, it is orthogonal to 4sk 1 + the tributary 10 of the external force of the child shape 9 and &quot; is due to the surface of the casting, or the line of force of μ is orthogonal. Maximizing electromagnetic light coupling ^ requires quadrature components' in order to generate liquid metal. &Quot; Knowing the 14 types of fields can be easily illustrated by the multi-phase linear sensor 7a to illustrate the first sensors 12 and 13 of the present invention # 于 4 The fighter is also evil 7, two of the eight in the same linear system are placed horizontally and vertically on both sides of the If axis Degrees (collinear sensors) and reverse the entire width of the phase making machine to produce +, # 1S reverse to 'in order to make the magnetic field of the casting. 18, the collinear sensors that move laterally to Shiyang The system is advantageously designed so that

Or in each of them produces moving magnetism: (two half of the 1U half-length length of the steel ingot 6 is less than two, ^ /, has a temple or tip smaller than flat in this case, and # Er &lt; Stirring cross-shaped convergence lateral 18 200533437 tributaries lla, m provided, and after passing through the convergence point p, they reach the expansion flow 1 Θ a, 1 0 b 〇 Figure 7b illustrates a second embodiment of the present invention, which is equivalent to the previous The obtained effect. According to this second embodiment, the linear sensors M and $ are installed in a collinear but inverted manner and are placed vertically along the casting axis. In this way, the longitudinal tributary centers and ⑽ (there are Within the secondary zone is the second

The foundation specific to Ming) is directly activated at this time. The upper sensor 14 then generates a magnetic field that moves toward the top of the casting machine in the direction of the mold, and the lower sensor b generates a field that moves downward toward the bottom of the pool. "^ Figure 8 illustrates a preferred embodiment of the present invention. This example consists in turning the upper edge of the recirculating upper leaflet I ^ L4 (which enhances the casting jets 7 and 7) into an active convection zone. To do this- Point, adding the pair of sensors that already exist in the secondary cooling zone. The two additional linear sensors, 16, 17 that generate a horizontal moving field are used to generate the scrambled cross 9. These two sensors Tied to the outlets 5 and 5, the discharged metal jets ..., the two sides of the nozzle 4 at the same height are placed on the same line, and the nozzles move in the same direction toward the small prayer wall 3 of the mold i. The jets The Γ effect between the central stream and the central stream rising from the bottom is further enhanced in this way. As a result, the local "double loop" mode is also enhanced. 、 图 说 # 目 5㉚ 似 ’But no matter how the two differ, a basic one: the metal circulation direction in each of the four tributaries of the sub-opening 9 is consistent. Therefore, FIG. 9 illustrates the second main embodiment of the present invention, which is to generate a reverse longitudinal collinear flow 20a located in the central part of the casting 6 and then converge to 2 p to provide an overall cycle of liquid metal. 19 200533437 this The liquid metal in the mold 1 is along the small sides 18, 18, and ... the nozzle discharge holes 5, 5 are ejected, and the eight rises are extended, one M + ^, the spoon is a jet 7, 7, The flow of the height is extended, but in the opposite direction, they will reverse μ ^ ^ ^ H. The righteous war is a delayed flow to interrupt the metal jet. One body is still an agitated shape with four areas, so its: The secondary ^ ^ road formed by 4 rotates in the opposite direction to the first embodiment. However, due to the reverse action of upper leaf flap L1 and sample m, L ^ ^ ^ spray stages 7 and 7 ', the seal in the central part of the liquid pool is not sealed. In these areas of the production mouth, there should be a better understanding of the Er's formula of m in these two main real species phases. In fact, it is only the two complementary Qi and Wu of the present invention. Aspects ~ :: Coexistence when searching for methods. In fact, if you "... easily adjust the moving direction of the applied magnetic field, for example, make the polarities of the sensors that generate them away from these #__" "11", it is wrong to act on the limitation In the casting reverse spraying: the mixing inside can be interrupted or accelerated as needed, the flow of the flow 7,7 ,. Therefore, we can see that the main advantage of the present invention / the "inflammation" to ensure a good change in the liquid tank : ㈣It can also act on the prayer spray -w account in the prayer mold from a long distance. You can do this by deploying electromagnetic mixing equipment from Yuma and ordinary ... ', /, components are available commercially. C understanders' The present invention is summarized in the wise use of the current "two electromagnetic strands in the secondary zone, and in each strand formed" tick set: cut in the long direction side by side, Λ Again, ^ $ 系 异 "type scrambled shape. By moving: the point 'is generated in the secondary zone of the overall fluid force system consisting of four leaflets', the heart of which has a towel, ❹Ｍ 「_ 十 20 200533437 Preferably, for significant reasons for symmetry, This division is at the middle width of the casting, that is, 、 and 系 are usually coincident with the casting axis. 4 ~ The longitudinal axis of the part 'because of this axis * this-point description' In order to make the center position of the center point P toward a certain One side wall 5 or the other side 5, sideways "shore cry 12,13 ... For example, by adjusting the supply sense by difference 1: the current intensity is enough to make the stirring force of the two lateral tributaries Ua, llb out of balance, 蕤Ub u stud hunting This kind of in-mold motion that serves one side of the nozzle is more selective than the other. Linking the same equipment also produces a similar imbalance, X / ;, L 10a ,,,, v causes the center point P of the stirring cross to be shifted up or down without adjusting the position of the equipment on the scale machine. If you want to be able to use the two options of adjustment, then the general public !: Yaozi: ^ The secondary area of the device constituted by ^ so that Γ; Each of 10a, 10b, 1la, and lib. Regardless of its implementation mode, the overall agitation of the Koko metal, 1 energy ': Ming provides the chemical homogeneity of the entire metallurgical length without the heat and sub-cooling zone between the top and bottom of the pool = lost Individually in the prayer mode and in the second case, it indeed makes the inside of the mold a beneficial effect, and the local flow pattern in the love scene 1 without interference is stable. Undoubtedly, the meaning is extended to many implementation examples; it is not limited to the above examples, but more specifically, it is a special subject, or the effect, the limitation is to comply with the following claims Definer. Therefore, for example, although ancient σ ′ has a flat surface structure, the configuration is only a better one. Equally suitable may be arc-shaped sensors, so that they more appropriately match the surface shape of the slab when placed along the metallurgical length. [Brief description of the drawings] The present invention will be more clearly understood and other aspects will become more apparent from the description provided with reference to the drawings, in which-Figs. 1 to 4 are representative diagrams of the prior art and have been considered as above. More precisely:

* Figure 1 is a standard diagram, which shows the outline and the vertical central area parallel to the large casting wall of the mold. The immersion nozzle equipped with the lateral discharge hole opening to the small casting wall is used to enter the mold for continuous plate description. The known cyclic motion diagram of the liquid metal created by prayer; back to a 2b] and 2b2 are the known in-mold electromagnetic stirring losses of the immersion type ^ (, ..., Figure 1) with a linear multiphase sensor and a linear multiphase sensor Two views (perspective view on the left and cross-section view on the right). This linear phase sensor is located on each large casting wall of the mold on both sides of the nozzle, generating a sliding magnetic field that moves horizontally in the opposite direction on the same large casting wall. , The field is the same direction of the metal ejection stream (Figure 2b2), or applied to the metal ejection stream in the opposite direction (Figures and 2a); * Figure 3 is a simplified diagram of the slab and column during continuous casting = Visible in the secondary cooling zone of each machine.配备 Each product is equipped with a facing-to-linear sensor 7220546 on each output of the product to generate a magnetic field of "butterfly" shape as known in the above-mentioned French patent; 22 200533437 * Figure 4 is A circle similar to the aforementioned one in FIG. 3, but represents: the electromagnetic grant mode, for example, produced by implementing the teaching of the above two :: 8210844; ⑵ patent wood block-other illustrations, number 5 to 9 Is unique to the present invention. To be more precise: * Figure 5 shows the field system seen in the axial vertical area, which is used for continuous praying. This axial vertical area is provided and has / cast walls parallel to the mold. The submerged t-mouth of the lateral discharge hole of the money wall. This figure is an implementation mode of the present invention. In the secondary cooling zone, the principle of four == integers, in which the reverse longitudinal flow flows to each other. Separate cyclic motion diagrams; the liquid gold form of this square is not: Λ is: the graph of Jing5, but in this example, the in-mold flow mode is no longer a "double-loop" type but a "single-loop" type ;

(V translation is based on repeating Figure 1 as a reference, which shows the use of a linear induction benefit with water labor to implement a four-leaf clover agitation; ... the picture is wide! Similar to the picture of Figure 7a 'but illustrates the implementation of the present invention-' &amp; a linear sensor with a vertical moving magnetic field; the figure is also based on repeating FIG. 5 and illustrates a more general example of the present invention. The linear sensor is used to generate a horizontal moving field. Establish complementary in-mold flow, the field directly acts on the metal jet ejected from the exit of the casting port; and the second series illustrates another embodiment of the present invention, which consists in generating the longitudinal direction of the bit and the central part. Metal flow, these flows do not expand but converge 23 200533437. [Key component symbol description] 21 Main part 4 Submerged nozzle 22 Partial recirculation flow 5 Side discharge hole 23 Free surface 5, Side discharge hole 25 Solid 4 Dagger 6 Casting 26 Nozzle 7 Jet 27 Side L7, Jet 1T Side L8 Meniscus 30a Linear Sensor 9 Stir Cross 30, a Linear Sensor 10a Tributary 30b Linear Sensor 10b tributary 30, b linear sensor 11a tributary 31 nozzle lib tributary 32 mold 12 linear sensor 41 linear sensor 13 linear sensor 4Γ linear sensor 14 linear sensor 42 loop 15 linear sensor 42a flow 16 linear sensor 42b Flow 17 Linear sensor 43 Loop 20a Longitudinal collinear flow 43b Flow 20b »" · P • 丨 * Λ- Longitudinal Xingchen flow 51 Lateral zone LI leaf flap 52 Lateral zone L2 leaf lobe 24 200533437 60 Central loop L3 leaf Lobe 61 Outer loop L4 Leaf petal 62 Outer loop L5 Recirculation loop 1 Mold L6 Recirculation loop 2 Secondary cooling zone 3 Small casting wall 3, Small casting wall

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Claims (1)

200533437 X. The scope of patent application: 1 · A continuous magnetic stacking method for the continuous casting and stacking of metal products with long cross-sections ^ ρ, long cross-sections in the cooling zone 5 and two magnetic stirring methods, The side of the small mold wall of the mold + —The immersion-type casting port with the exit hole toward the side of the mold is provided, and it is placed close to the casting genus &amp; evening 4 ^ The stirring side is used for the application, which is characterized by ^ _, seat The raw and dynamic magnetic fields are stained, and once into the cooling zone (2), the blood is cast; the solidification tank (6) between q ^ is filled with meat, and the purpose of the liquid metal exchange is internally established. The second time, the person sewn to the Mon region, and became two: The flow is limited to the casting &quot; η, is two reverse collinear currents (⑽, im20b) ^ / with two upper leaflets and two lower leaflets. The whole liquid metal circulation, # ^ a maternity and lodging ”shape white (, Shu employment clothes, the leaf clover above the four-leaf clover (L1, to the mold to reach the discharge of the stream (4) from the immersion mouth) Holes (5,5 ')-the pieces are mixed in a piece of money to generate the longitudinal reverse collinear flow (· / m flap ⑴, L4) that moves on the two pieces, which extends into the mold = To the jets (7,5 ′) sprayed from the core discharge hole (5'5 ') and merge with the jets in the same direction to enhance them. The method is characterized in that the longitudinal reverse collinear flow (20a, 20b) converging with each other in the scale domain produces f :: on-chip leaf flaps (L1, L4) 'which extends into the mold to reach the discharge from the casting gate. The height of the nozzle flow ('7,) sprayed by the holes (5, 5,) is reversed and stacked on the spray flow to slow them down. 4. The sand mixing method according to item [Scope of the patent application] is characterized by two Times 26 200533437 The position of the off-stream flow within the system is that you are moving towards a certain side of the casting. Or another small side. The longitudinal metal flow system is used in the central area. Longitudinal: dynamic = characteristic J magnetic field generation each other more The two opposite common I lines move closer to or apart from each other. 6. For example, Fangong of item 2 or 3 of the patent application scope. The longitudinal metal flow system uses the entire width of the casting, and is characterized by a moving magnetic field generated by the casting. The collinear flow of the edges moving towards each other ^ ^, or the two opposite co-currents of c φ \ sin near the casting -In the pieces ~ two that are more separated toward the edge Method of blending items, line flow. The dynamic magnetic field is produced by placing on the side facing the casting: 'which is characterized by this shift. The Xixian linear inductor is characterized by this sense. 8. The stirring method as in item 7 of the patent application scope. The reactor is supplied with currents of different strengths. 1 As described in Jia Qing's patent, other moving magnetic fields are used, which directly act on the metal jets (7,7,) discharged from the exit (5,5,) of 今 in I and U. W Animated towel r as I, 10. — A kind of flat metal products obtained from continuous casting equipment ~ The secondary cooling zone of the manufacturing equipment is located in the electromagnetic search and mixing operation position of Zhongping. Shoudi 1, as defined by the continuous term 11. Schematic: As in the next page. 27