Spindle foot roller, foot roller system and continuous casting method for improving slab mold quality

Abstract

The application discloses a spindle-shaped foot roller, a foot roller system and a continuous casting method for improving the quality of a slab blank mold, the spindle-shaped foot roller comprising a foot roller center part, a foot roller edge part and a foot roller transition part; the roller surface diameter of the foot roller center part is 105 mm, and the roller surface diameter of the foot roller edge part is 100 mm; the foot roller transition part between the foot roller center part and the foot roller edge part adopts a curved smooth transition design. Through optimization of geometric parameters and transition design of the spindle-shaped foot roller, the application can improve the narrow-face blank shell supporting effect, uniformly distribute mechanical pressure, effectively improve the blank mold and surface quality of the cast blank, and reduce defects and production risks.

Description

Technical Field

[0001] This application relates to the field of metallurgical technology, and more specifically, to a spindle-shaped foot roll, a foot roll system, and a continuous casting method for improving the quality of slab blanks. Background Technology

[0002] With the continuous development of continuous casting technology, high efficiency and high quality have become important core indicators for measuring its technological level. As a key component of the continuous casting machine, the crystallizer undertakes the core function of converting liquid steel into a solid billet shell, and its precision control is directly related to the production stability and billet quality of the continuous casting machine. However, when the billet enters the foot roll area from the crystallizer, although the secondary cooling water and foot roll support can alleviate the bulging effect caused by the static pressure of the molten steel to a certain extent, problems such as excessive bulging and indentation on the narrow face still occur frequently under high casting speed conditions or when the foot roll support force is insufficient. These defects not only reduce the billet shape quality, but also easily cause edge fine line defects in the subsequent rolling process, seriously affecting product performance and market competitiveness. Therefore, technical solutions to problems such as excessive bulging and indentation on the narrow face are particularly important. This invention proposes a spindle-shaped foot roll and its usage method to improve the billet shape quality, aiming to effectively improve the billet shape quality through innovative design, while enhancing the overall performance of the continuous casting process. Summary of the Invention

[0003] The summary section of this application introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this application is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0004] The spindle-shaped foot roll, foot roll system, and continuous casting method provided in this application can improve the support effect of narrow-face billet shells while uniformly distributing mechanical pressure, effectively improving the billet shape and surface quality, and reducing defects and production risks.

[0005] In a first aspect, this application provides a spindle-shaped foot roller for improving the quality of slab blanks. The spindle-shaped foot roller includes a central part, an edge part, and a transition part. The diameter of the roller surface of the central part is 105 mm, and the diameter of the roller surface of the edge part is 100 mm. The transition part between the central part and the edge part adopts a smooth curve transition design.

[0006] In one possible implementation, the foot roller edge portion includes a left edge portion and a right edge portion, both of which are 25 mm in length.

[0007] In one feasible implementation, the foot roller transition portion includes a left transition portion and a right transition portion, both of which are 32 mm in length.

[0008] In one feasible implementation, the length of the central portion of the foot roller is 80 mm.

[0009] In one feasible implementation, the outer edge of the foot roller edge portion is designed with a rounded corner with a radius of 5 mm.

[0010] Secondly, this application also provides a foot roll system for a slab continuous casting machine, the foot roll system comprising at least one set of spindle-shaped foot rolls as described in any of the above feasible embodiments.

[0011] In one feasible implementation, the foot roll system further includes at least one set of planar foot rolls, wherein the spindle-shaped foot rolls are installed in the first and second rows of the foot roll area of ​​the slab continuous casting machine, and the planar foot rolls are installed in the third and fourth rows of the foot roll area.

[0012] Thirdly, this application also provides a slab continuous casting method, in which a spindle-shaped foot roller as described in any of the above feasible embodiments is used during the continuous casting process.

[0013] In summary, the spindle-shaped foot roller of this application features a larger roller diameter (105 mm) in its central portion, which is thicker than the edge portion (100 mm). The central portion is the main support area for the narrow-faced billet shell; increasing the diameter provides greater support at this location, effectively reducing bulging defects caused by thermal stress and mechanical action, and improving the overall shape quality of the billet. Furthermore, the transition between the central and edge portions of the foot roller employs a smooth curved transition design, avoiding stress concentration problems caused by straight or sharp transitions. The curved transition distributes mechanical contact pressure more evenly, keeping the narrow-faced billet shell smooth in the foot roller contact area, further reducing the risk of indentation and deformation. In conclusion, by optimizing the geometric parameters and transition design of the spindle-shaped foot roller, this application can improve the support effect of the narrow-faced billet shell while evenly distributing mechanical pressure, effectively improving the billet shape and surface quality, and reducing defects and production risks. Attached Figure Description

[0014] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit this specification. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0015] Figure 1This is a schematic diagram of the structure of a spindle-shaped foot roller provided in an embodiment of this application;

[0016] Figure 2 This is a schematic diagram of the foot roll system for a slab continuous casting machine provided in an embodiment of this application.

[0017] In the figure, 1 is the outer edge of the foot roller edge section, 2 is the connection between the foot roller transition section and the foot roller edge section, and 3 is the connection between the foot roller transition section and the foot roller center section. Detailed Implementation

[0018] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and not to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein. Furthermore, the terms “is” and “has,” and any variations thereof, used in this application are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0019] In this application, the terms "module" or "unit" refer to a computer program or part of a computer program that has a predetermined function and works with other related parts to achieve a predetermined goal, and can be implemented, wholly or partially, using software, hardware (such as processing circuitry or memory), or a combination thereof. Similarly, a processor (or multiple processors or memory) can be used to implement one or more modules or units. Furthermore, each module or unit can be part of a larger module or unit that includes the functionality of that module or unit.

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. In the following description, "some embodiments" are referred to, which describes a subset of all possible embodiments. However, it is understood that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0021] This application provides a spindle-shaped foot roller, which includes a central part, an edge part, and a transition part. The diameter of the roller surface of the central part is 105 mm, and the diameter of the roller surface of the edge part is 100 mm. The transition part between the central part and the edge part adopts a smooth curve transition design.

[0022] Specifically, the spindle-shaped foot roller structure consists of a central section, an edge section, and a transition section. The central section is designed with a larger diameter roller surface (105 mm), providing stronger support for the narrow-faced billet shell and effectively reducing the bulging problem at the center. The edge section has a smaller diameter roller surface (100 mm), avoiding indentation due to excessive force when in contact with the narrow-faced billet shell. The smooth transition between the central and edge sections ensures uniform pressure distribution and avoids stress concentration caused by sharp contact at the transition point, thereby improving the stability of the billet shell support and surface quality. This structural design achieves the dual goals of billet shape control and surface defect reduction, optimizing the quality of the cast billet.

[0023] In summary, the spindle-shaped foot roller provided in this embodiment has a larger roller diameter (105 mm) in its central portion, which is thicker than the edge portion (100 mm). The central portion is the main support area for the narrow-faced billet shell; increasing the diameter provides greater support at this location, effectively reducing bulging defects caused by thermal stress and mechanical action, and improving the overall shape quality of the billet. Furthermore, the transition between the central and edge portions of the foot roller uses a smooth curved transition design, avoiding stress concentration problems caused by straight or sharp transitions. The curved transition distributes mechanical contact pressure more evenly, keeping the narrow-faced billet shell smooth in the foot roller contact area, further reducing the risk of indentation and deformation. In conclusion, by optimizing the geometric parameters and transition design of the spindle-shaped foot roller, this embodiment can improve the support effect of the narrow-faced billet shell while evenly distributing mechanical pressure, effectively improving the billet shape and surface quality, and reducing defects and production risks.

[0024] In some embodiments, the aforementioned foot roller edge portion includes a left edge portion and a right edge portion, both of which are 25 mm in length.

[0025] In some embodiments, the aforementioned foot roller transition portion includes a left transition portion and a right transition portion, both of which are 32 mm in length.

[0026] In some embodiments, the length of the central portion of the aforementioned foot roller is 80 mm.

[0027] In some embodiments, the outer edge of the aforementioned foot roller edge portion is designed with a rounded corner with a radius of 5 mm.

[0028] Through these embodiments, the design of the spindle-shaped foot roller has been further refined, with the dimensions and geometry of each part precisely optimized. The edge portion of the spindle-shaped foot roller is divided into a left edge portion and a right edge portion, each 25 mm in length, designed for proper contact with the narrow face of the billet shell, preventing unnecessary indentations. The foot roller transition portion is also divided into a left transition portion and a right transition portion, each 32 mm in length. This rational length design and smooth transition ensure even pressure distribution during mechanical contact, avoiding stress concentration. The center portion of the foot roller is 80 mm long, providing the main support to reduce bulging at the center of the narrow face. The outer edges of the edge portions feature a 5 mm radius rounded corner design, further reducing indentations and damage to the billet shell surface caused by sharp contact. This integrated design of structural features effectively improves the quality and surface smoothness of the cast billet.

[0029] For details, see Figure 1 , Figure 1 This is a schematic diagram of a spindle-shaped foot roller provided in an embodiment of this application. In the figure, R5 indicates a rounded corner design with a radius of 5 mm, R20 indicates a smooth transition achieved with a 20 mm arc, R180 indicates a smooth transition achieved with a 180 mm arc, and 80 indicates that the length of the center portion of the foot roller is 80 mm. This indicates that the total length of the spindle-shaped foot roller is 194.0 mm (with a negative tolerance of -0.2 mm). This indicates that the diameter of the roller surface at the center of the foot roller is 105 mm. This indicates that the diameter of the roller surface at the edge of the foot roller is 100 mm.

[0030] This application provides a foot roll system for a slab continuous casting machine. The system includes at least one set of spindle-shaped foot rolls provided in this application, which improve the quality of narrow face of the slab through optimized design.

[0031] In some embodiments, the foot roll system further includes planar foot rolls, wherein spindle-shaped foot rolls are installed in the first and second rows of the foot roll area to provide stronger support when the billet shell is soft, reducing bulging on the narrow face; the planar foot rolls are installed in the third and fourth rows of the foot roll area to provide smooth transition support as the billet shell gradually hardens, avoiding excessive support force that could cause positional displacement, while further ensuring the smoothness and uniformity of the narrow face surface quality. This combined design fully utilizes the structural advantages of both types of foot rolls, significantly improving the billet shape quality and production stability. See details. Figure 2 , Figure 2 This is a schematic diagram of the structure of a foot roller system for a slab continuous casting machine provided in an embodiment of this application.

[0032] Specifically, under the influence of the casting action and the cooling water in the foot roll area, the narrow-faced billet shell near the bottom of the crystallizer is relatively soft. At this time, the foot rolls have a significant supporting effect on the bulging of the narrow face. Therefore, spindle-shaped foot rolls are installed in the first and second rows of the foot roll area to provide greater support for the softened billet shell and effectively reduce the formation of bulging in the narrow face. Flat foot rolls are installed in the third and fourth rows to avoid the foot rolls from shifting due to excessive support force, while also achieving a smooth transition of billet shell support, further ensuring the smoothness and uniformity of the narrow face quality of the cast billet.

[0033] This application provides a slab continuous casting method, characterized in that a spindle-shaped foot roller as provided in this application is used during the continuous casting process.

[0034] Specifically, the spindle-shaped foot roll, through its thickened center, reduced edge diameter, and smooth transition design, provides greater support for narrow-faced billet shells, significantly reducing bulging on narrow faces and preventing indentations. This method fully utilizes the geometric advantages of the spindle-shaped foot roll, and compared to traditional foot rolls, it can more effectively improve the billet shape quality, meeting the demands of high-precision, high-quality slab production. Through this innovative design, the stability of the continuous casting process and the surface quality of the billet are significantly improved.

[0035] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A spindle-shaped foot roller for improving the quality of slab blank shape, characterized in that, The spindle-shaped foot roller includes a central portion, an edge portion, and a transition portion. The diameter of the roller surface at the center of the foot roller is 105 mm, and the diameter of the roller surface at the edge of the foot roller is 100 mm. The length of the central portion of the foot roller is 80 mm; The foot roller transition section includes a left transition section and a right transition section, both of which are 32 mm in length; The foot roller edge portion includes a left edge portion and a right edge portion, both of which are 25 mm in length. The outer edge of the foot roller edge portion is designed with a rounded corner with a radius of 5 mm. The transition portion of the foot roller between the center portion and the edge portion of the foot roller adopts a smooth curved transition design. The transition portion of the foot roller is formed by connecting an arc with a radius of 20 mm and an arc with a radius of 180 mm. The arc with a radius of 20 mm is closer to the edge of the foot roller, and the arc with a radius of 180 mm is closer to the center of the foot roller.

2. A foot roll system for a slab continuous casting machine, characterized in that, The foot roller system includes at least one set of spindle-shaped foot rollers as described in claim 1.

3. The foot roller system according to claim 2, characterized in that, The foot roll system further includes at least one set of planar foot rolls, wherein the spindle-shaped foot rolls are installed in the first and second rows of the foot roll area of ​​the slab continuous casting machine, and the planar foot rolls are installed in the third and fourth rows of the foot roll area.

4. A method for continuous casting of slabs, characterized in that, The spindle-shaped foot roller as described in claim 1 is used in the continuous casting process.

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