Spindle-shaped foot roller, foot roller system and continuous casting method for improving quality of plate blank

Abstract

The invention discloses a spindle-shaped foot roller capable of improving the quality of a plate blank, a foot roller system and a continuous casting method. The spindle-shaped foot roller comprises a foot roller center part, a foot roller edge part and a foot roller transition part. The roller surface diameter of the central part of the foot roller is 105 mm, and the roller surface diameter of the edge part of the foot roller is 100 mm; and the foot roller transition part between the foot roller center part and the foot roller edge part adopts a curve smooth transition design. Through geometric parameter optimization and transition design of the spindle-shaped foot roller, the supporting effect of the narrow-face blank shell can be improved, meanwhile, mechanical pressure can be evenly distributed, the blank type and the surface quality of a casting blank are effectively improved, and meanwhile defects and production risks are reduced.

Description

Technical Field

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

[0002] With the continuous development of continuous casting technology, high efficiency and high quality have become important core indicators to measure its technical level. As a key component of the continuous casting machine, the crystallizer undertakes the core function of converting liquid steel into a solid shell, and its precision control is directly related to the production stability and quality of the continuous casting machine. However, when the billet enters the foot roller area from the crystallizer, although the secondary cooling water and foot roller support can alleviate the bulging effect caused by the static pressure of the molten steel to a certain extent, under high pulling speed conditions or when the foot roller support force is insufficient, problems such as excessive narrow face bulging and narrow face indentation still occur frequently. These defects not only reduce the billet quality of the billet, 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 narrow face bulging and narrow face indentation are particularly important. The present invention proposes a spindle-shaped foot roller for improving the billet quality of the slab and a method of using the same, aiming to effectively improve the billet quality of the billet through innovative design, while improving the overall performance of the continuous casting process. Summary of the invention

[0003] A series of simplified concepts are introduced in the summary of the invention, which will be further described in detail in the detailed description. The summary of the invention of this application does not mean to attempt to define the key features and essential technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

[0004] The spindle-shaped foot roller, foot roller system and continuous casting method provided in the present application can evenly distribute mechanical pressure while improving the support effect of the narrow-surface billet shell, effectively improving the billet shape and surface quality of the cast billet, while reducing defects and production risks.

[0005] In the first aspect, the present application provides a spindle-shaped foot roller for improving the quality of the slab blank, the spindle-shaped foot roller includes 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.

[0006] In a feasible implementation manner, the foot roller edge portion includes a left edge portion and a right edge portion, and the lengths of the left edge portion and the right edge portion are both 25 mm.

[0007] In a feasible implementation manner, the foot roller transition portion includes a left transition portion and a right transition portion, and the lengths of the left transition portion and the right transition portion are both 32 mm.

[0008] In a possible embodiment, the length of the central portion of the foot roller is 80 mm.

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

[0010] In a second aspect, the present application also provides a foot roller system for a slab continuous casting machine, wherein the foot roller system comprises at least one group of spindle-shaped foot rollers in any one of the above-mentioned feasible embodiments.

[0011] In a feasible embodiment, the foot roller system also includes at least one group of flat foot rollers, wherein the spindle-shaped foot rollers are installed in the first and second rows of the foot roller area of ​​the slab continuous casting machine, and the flat foot rollers are installed in the third and fourth rows of the foot roller area.

[0012] In a third aspect, the present application also provides a slab continuous casting method, which uses a spindle-shaped foot roller as in any of the above-mentioned feasible embodiments during the continuous casting process.

[0013] In summary, the center part of the foot roller of the spindle-shaped foot roller of the present application adopts a larger roller surface diameter (105 mm), which is thicker than the diameter of the edge part (100 mm). The center part is the main support area of ​​the narrow surface billet shell. Increasing the diameter can provide greater support force at this position, thereby effectively reducing the bulging defects of the narrow surface billet shell caused by thermal stress and mechanical action, and improving the overall shape quality of the slab; and the transition between the center part and the edge part of the foot roller adopts a curved smooth transition design, which avoids the stress concentration problem caused by straight lines or sharp transitions. The curved transition can distribute the mechanical contact pressure more evenly, so that the narrow surface billet shell remains smooth in the foot roller contact area, and further reduces the risk of indentation and deformation. In summary, the present application optimizes the geometric parameters and transition design of the spindle-shaped foot roller, which can improve the support effect of the narrow surface billet shell while evenly distributing the mechanical pressure, effectively improving the billet shape and surface quality of the cast billet, and reducing defects and production risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present specification. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

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

[0016] Figure 2 A schematic structural diagram of a foot roller system for a slab continuous casting machine provided in an embodiment of the present application.

[0017] In the figure, 1 is the outer edge of the edge part of the foot roller, 2 is the connection between the transition part of the foot roller and the edge part of the foot roller, and 3 is the connection between the transition part of the foot roller and the center part of the foot roller. DETAILED DESCRIPTION

[0018] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "is" and "has" and any variations thereof involved in the present application are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0019] The term "module" or "unit" in this application refers to a computer program or a part of a computer program that has a predetermined function and works together with other related parts to achieve a predetermined goal, and can be implemented in whole or in part by using software, hardware (such as processing circuits or memories) or a combination thereof. Similarly, a processor (or multiple processors or memories) can be used to implement one or more modules or units. In addition, each module or unit can be part of an overall module or unit that includes the function of the module or unit.

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. In the following description, it is related to "some embodiments", which describes a subset of all possible embodiments, but it can be 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] An embodiment of the present application provides a spindle-shaped foot roller, which includes 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.

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

[0023] In summary, the central part of the foot roller of the spindle-shaped foot roller provided in the embodiment of the present application adopts a larger roller surface diameter (105 mm), which is thicker than the diameter of the edge part (100 mm). The central part is the main support area of ​​the narrow surface billet shell. Increasing the diameter can provide greater support force at this position, thereby effectively reducing the bulging defects of the narrow surface billet shell caused by thermal stress and mechanical action, and improving the overall shape quality of the slab; and the transition between the central part and the edge part of the foot roller adopts a curved smooth transition design, which avoids the stress concentration problem caused by straight lines or sharp transitions. The curved transition can distribute the mechanical contact pressure more evenly, so that the narrow surface billet shell remains smooth in the foot roller contact area, and further reduces the risk of indentation and deformation. In summary, the embodiment of the present application optimizes the geometric parameters and transition design of the spindle-shaped foot roller, which can evenly distribute the mechanical pressure while improving the support effect of the narrow surface billet shell, effectively improving the billet shape and surface quality of the cast billet, 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, and the lengths of the left edge portion and the right edge portion are both 25 mm.

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

[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 adopts a chamfered corner design with a radius of 5 mm.

[0028] Through the above-mentioned embodiments, the design of the spindle-shaped foot roller is further refined, and the size and geometric features of each part are precisely optimized. The edge portion of the spindle-shaped foot roller is divided into a left edge portion and a right edge portion, each of which is 25 mm long, and is used to make appropriate contact with the narrow surface of the billet shell to prevent unnecessary indentations. The foot roller transition portion is also divided into a left transition portion and a right transition portion, each of which is 32 mm long. Through reasonable length design and smooth transition, it is ensured that the pressure in the mechanical contact is evenly distributed to avoid stress concentration. The length of the center portion of the foot roller is 80 mm, and this part provides the main support force to reduce the bulging in the center of the narrow surface. The outer edge of the edge portion adopts a chamfered corner design with a radius of 5 mm to further reduce the indentations and damage caused by sharp contact to the surface of the billet shell. The comprehensive design of these structural features effectively improves the quality and surface flatness of the ingot mold.

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

[0030] An embodiment of the present application provides a foot roller system for a slab continuous casting machine, which includes at least one group of spindle-shaped foot rollers provided in an embodiment of the present application, and improves the quality of the narrow surface of the cast slab through its optimized design.

[0031] In some embodiments, the foot roller system also includes a flat foot roller, wherein the spindle-shaped foot rollers are installed in the first and second rows of the foot roller area to provide stronger support when the billet shell is soft and reduce narrow side bulging; the flat foot rollers are installed in the third and fourth rows of the foot roller area to provide smooth transition support after the billet shell gradually hardens, to avoid position deviation caused by excessive support force, and to further ensure the smoothness and uniformity of the narrow side surface quality. This combined design makes full use of the structural advantages of the two foot rollers and significantly improves the billet quality and production stability of the casting. For details, see Figure 2 , Figure 2 It is a structural schematic diagram of a foot roller system for a slab continuous casting machine provided in an embodiment of the present application.

[0032] Specifically, under the influence of the billet drawing and the cooling water in the foot roller area, the narrow surface billet shell near the lower mouth of the crystallizer is relatively soft, and the foot roller has a significant supporting effect on the narrow surface bulging. Therefore, spindle-shaped foot rollers are installed in the first and second rows of the foot roller area to provide greater support for the softened billet shell and effectively reduce the formation of narrow surface bulging; flat foot rollers are installed in the third and fourth rows to avoid the displacement of the foot roller position due to excessive support force, and at the same time achieve a smooth transition of the billet shell support, further ensuring the smoothness and uniformity of the quality of the narrow surface of the casting.

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

[0034] Specifically, the spindle-shaped foot roller provides greater support for the narrow billet shell through the thickening of the center, the reduction of the edge diameter, and the smooth design of the transition part, significantly reducing the narrow side bulging and avoiding the generation of indentations. This method makes full use of the geometric advantages of the spindle-shaped foot roller. Compared with the traditional foot roller, it can more effectively improve the billet quality of the billet and meet the needs of high-precision and high-quality slab production. Through this innovative design, the stability of the continuous casting process and the surface quality of the billet have been significantly improved.

[0035] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A spindle-shaped foot roller for improving the quality of slab blank, characterized in that: The spindle-shaped foot roller comprises a foot roller center portion, a foot roller edge portion and a foot roller transition portion; The roller surface diameter of the central part of the foot roller is 105 mm, and the roller surface diameter of the edge part of the foot roller is 100 mm; The foot roller transition portion between the foot roller center portion and the foot roller edge portion adopts a curved smooth transition design.

2. The spindle-shaped foot roller according to claim 1, characterized in that: The foot roller edge portion includes a left edge portion and a right edge portion, and the lengths of the left edge portion and the right edge portion are both 25 mm.

3. The spindle-shaped foot roller according to claim 2, characterized in that: The foot roller transition portion includes a left transition portion and a right transition portion, and the lengths of the left transition portion and the right transition portion are both 32 mm.

4. The spindle-shaped foot roller according to claim 3, characterized in that: The length of the center portion of the foot roller is 80 mm.

5. The spindle foot roller according to claim 1, characterized in that: The outer edge of the edge portion of the foot roller is designed with a rounded corner with a radius of 5 mm.

6. A foot roller system for a slab continuous casting machine, characterized in that: The foot roller system comprises at least one set of spindle-shaped foot rollers as claimed in any one of claims 1 to 5.

7. The foot roller system according to claim 6, characterized in that: The foot roller system also includes at least one group of flat foot rollers, wherein the spindle-shaped foot rollers are installed in the first and second rows of the foot roller area of ​​the slab continuous casting machine, and the flat foot rollers are installed in the third and fourth rows of the foot roller area.

8. A slab continuous casting method, characterized in that: The spindle-foot roller according to any one of claims 1 to 5 is used in a continuous casting process.

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