Free roll of continuous casting machine

Abstract

The free roller of the continuous casting machine comprises a roller column, the left end and the right end of the roller column are both connected with integrally-formed shaft heads, the end faces of the shaft heads are provided with a first connecting hole and a second connecting hole respectively, and the end face of the left shaft head is provided with a plurality of threaded holes. Annular grooves are formed in the left end face and the right end face of the roller column, first arc-shaped parts, second arc-shaped parts and third arc-shaped parts are arranged in the annular grooves, the stress of the shaft head of the roller is concentrated, the three radians of the annular grooves in the shaft head are redesigned, the stress area of the roller is large, the stress borne by the shaft head can be dispersed, and the service life of the roller is prolonged. The roller column is made of 42CrMo alloy structural steel and is forged, the forging ratio is larger than 3.5, the density of the roller column is increased, the roller column is subjected to heat treatment after a central water passing hole and a shaft head are machined, the hardness of the central portion of the roller column can reach HB300, the surface hardness can reach HB350, the roller column is firmer in structure, the service life of the roller column is prolonged, and the service life of the roller column is prolonged. And the problem of deformation is not easy to occur.

Description

Technical Field

[0001] The utility model relates to the technical field of continuous casting machines, in particular to a free roll of a continuous casting machine. Background Art

[0002] The continuous casting machine is the core equipment in steelmaking production, which determines the output and quality of billets. The roll is the heart equipment of the continuous casting machine. After the continuous casting machine is used for a period of time, there are some quality problems with new rolls and repaired rolls, such as broken rolls, roll deformation, fish scales on the roll surface, severe wear of the roll surface, burned bearings, burned seals, blockage of the water passage inside the bearing housing, shaft deformation and other faults. No matter which fault occurs, production must be stopped for treatment. Otherwise, the quality of billets will be affected, resulting in quality accidents such as billet stuttering, cracks, depressions, bending, skin turning, dimensional errors or surface wear scratches, etc. Inferior and waste billets are produced, and even larger production equipment accidents are caused, resulting in leakage of molten steel or burning and damage of other equipment in the arc section. Therefore, it is necessary to redesign the roll. Content of the Utility Model

[0003] The purpose of the utility model is to provide a free roll of a continuous casting machine to solve the problems put forward in the above background art.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A free roll of a continuous casting machine, including a roll column, both left and right ends of the roll column are connected with integrally formed shaft heads, the end faces of the shaft heads are respectively provided with a first connection hole and a second connection hole, and several threaded holes are provided on the end face of the left shaft head;

[0005] Both left and right end faces of the roll column are provided with annular grooves, and the annular grooves are internally provided with a first arc portion, a second arc portion, and a third arc portion. The diameter of the first arc portion is 7 mm or 4.5 mm, and the diameters of the second arc portion and the third arc portion are 10 mm and 78 mm respectively. The first arc portion, the second arc portion, and the third arc portion are used to disperse the stress of the shaft head and avoid the problem of broken rolls.

[0006] Furthermore, a central water passing hole is provided inside the roll column, and the central water passing hole is communicated with the first connection hole and the second connection hole, which reduces the weight of the roll column, saves materials, and reduces production costs.

[0007] Furthermore, a wear-resistant layer is welded on the surface of the roll column, which can protect the roll column and improve the service life of the roll column.

[0008] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0009] (1) The stress at the shaft head part of the roll is relatively concentrated. By redesigning the three radian angles of the annular groove on the shaft head, the stress-bearing area of the roll is large, the stress borne by the shaft head can be dispersed, and the problem of broken rolls is not likely to occur during use.

[0010] (2)The roller is made of 42CrMo alloy structural steel and is forged. The forging ratio is greater than 3.5 to increase the density of the roller. After machining the central water hole and the shaft head position, the roller is heat-treated. In this way, the hardness of the central part of the roller can reach HB300, and the surface hardness can reach HB350. The structure of the roller is more solid and not prone to deformation problems, avoiding problems such as stuttering, cracking, depression, bending, and skin turning of the roller.

[0011] (3)The wear-resistant layer protects the roller. During the use of the roller, the wear-resistant layer is worn first, and the wear-resistant layer can be replenished, extending the service life of the roller. Description of the Drawings

[0012] Figure 1 It is a cross-sectional view of the present utility model.

[0013] In the figure: 1, roller; 2, shaft head; 3, first connection hole; 4, second connection hole; 5, threaded hole; 6, central water hole; 7, first arc portion; 8, second arc portion; 9, third arc portion; 10, wear-resistant layer; 11, annular groove. Detailed Embodiment

[0014] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present utility model.

[0015] Embodiment:

[0016] Please refer to Figure 1 , the present utility model provides a technical solution: a continuous casting machine free roller, including a roller 1, both left and right ends of the roller 1 are connected with integrally formed shaft heads 2, the end faces of the shaft heads 2 are respectively provided with a first connection hole 3 and a second connection hole 4, and several threaded holes 5 are provided on the end face of the left shaft head 2;

[0017] Both left and right end faces of the roller 1 are provided with annular grooves 11, and the inside of the annular grooves 11 is provided with a first arc portion 7, a first arc portion 7, and a third arc portion 9, and the first arc portion 7, the first arc portion 7, and the third arc portion 9 are used to disperse the stress of the shaft head 2;

[0018] Figure 1 In the enlarged part, the depth b of the annular groove 11 is 29 mm, and the thickness a of the upper part of the annular groove 11 is 17.5 mm.

[0019] In this embodiment, a central water passage hole 6 is provided inside the roller column 1. The central water passage hole 6 communicates with the first connection hole 3 and the second connection hole 4. The roller column 1 is made of 42CrMo alloy structural steel. The roller column 1 is forged, and the forging ratio is required to be greater than 3.5. For rollers of the same size, the weight of the roller in this embodiment is 2 - 4 kg heavier than that of other rollers. After machining the positions of the central water passage hole 6 and the shaft head 2, the material is heat-treated. In this way, the hardness of the central part can reach HB300, and the surface hardness can reach HB350.

[0020] In this embodiment, a wear-resistant layer 10 is welded on the surface of the roller column 1. During production, the raw material of the roller column 1 is turned, and the skin of the roller column 1 is turned by 4 mm. The raw material of the roller column 1 is welded with a Ddstain414N-s 3.2 mm tubular welding wire to protect the roller column 1 and increase the service life of the roller column 1.

[0021] In this embodiment, the diameter of the first arc portion 7 is 7 mm or 4.5 mm. When the roller diameter is 250 mm and 230 mm, the diameter of the first arc portion 7 is 7 mm; when the roller diameter is 200 mm, the diameter of the first arc portion is 4.5 mm. The diameters of the second arc portion 8 and the third arc portion 9 are 10 mm and 78 mm respectively.

[0022] Specifically, through the structural design, process, and material improvement of the roller, the rigidity and stress of the roller are better. The original dimensions of the roller were:

[0023] Diameter 250 mm, first arc portion: 6 mm, second arc portion: 10 mm, third arc portion: 80 mm;

[0024] Diameter 230 mm, first arc portion: 6 mm, second arc portion: 10 mm, third arc portion: 880 mm;

[0025] Diameter 200 mm, first arc portion: 4 mm, second arc portion: 10 mm, third arc portion: 80 mm;

[0026] In this embodiment, the dimensions of the roller are:

[0027] Diameter 250 mm, first arc portion 7: 7 mm, second arc portion 8: 10 mm, third arc portion 9: 78 mm;

[0028] Diameter 230 mm, first arc portion 7: 7 mm, second arc portion 8: 10 mm, third arc portion 9: 78 mm;

[0029] Diameter 200 mm, first arc portion 7: 4.5 mm, second arc portion 8: 10 mm, third arc portion 9: 80 mm;

[0030] Compared with the original roller, the steel passing capacity of the roller in this embodiment has increased from the original normal 600,000 tons to 1.5 million tons, far exceeding the designed service life of the roller with a steel passing capacity of 600,000 tons, and reducing the maintenance cost.

[0031] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A free roller of a continuous casting machine, characterized in that, It includes a roller (1), and integral shaft heads (2) are connected to both the left and right ends of the roller (1). First connection holes (3) and second connection holes (4) are respectively provided on the end faces of the shaft heads (2), and a plurality of threaded holes (5) are provided on the end face of the left shaft head (2). Ring grooves (11) are provided on both the left and right end faces of the roller (1). A first arc portion (7), a second arc portion (8), and a third arc portion (9) are provided inside the ring grooves (11), and the first arc portion (7), the second arc portion (8), and the third arc portion (9) are used to disperse the stress of the shaft head (2).

2. The free roller of a continuous casting machine according to claim 1, characterized in that: A central water passing hole (6) is provided inside the roller (1), and the central water passing hole (6) communicates with the first connection hole (3) and the second connection hole (4).

3. A free roller of a continuous casting machine according to claim 1, characterized in that: A wear-resistant layer (10) is welded on the surface of the roller (1).

4. A free roller of a continuous casting machine according to claim 1, characterized in that: The diameter of the first arc portion (7) is 7 mm or 4.5 mm, and the diameters of the second arc portion (8) and the third arc portion (9) are 10 mm and 78 mm respectively.

Images