A rolling system and method for reducing roll marks of hot rolling special narrow strip steel

Abstract

This invention relates to the field of narrow strip steel rolling technology, and in particular to a rolling system and method for reducing roll marks in hot-rolled special narrow strip steel. The rolling system specifically includes, from the inlet side to the outlet side, a first rolling mill E, rolling mill F1, rolling mill F2, a second rolling mill E, rolling mill F3, rolling mill F4, rolling mill F5, rolling mill F6, rolling mill F7, rolling mill F8, and rolling mill F9. The first and second rolling mills E are E-type rolling mills, and the other rolling mills are F-type rolling mills. Each F-type rolling mill has a cooling system symmetrically installed facing the mill pressure rolls. This invention, by employing a method of cooling the rolls with hot water after the strip head is rolled, ensures the temperature of the high-strength special steel strip head, keeping the roll surface at a constant near-normal operating state. This improves roll utilization and product quality yield, and solves the problem of the high hardness and large deformation resistance caused by low temperature during strip threading affecting the rolls.

Description

Technical Field

[0001] This invention relates to the field of narrow strip steel rolling technology, and in particular to a rolling system and method for reducing roll marks in hot-rolled special narrow strip steel. Background Technology

[0002] In the production of high-hardness special steel from hot-rolled narrow strip steel, the strip has high deformation resistance. During strip threading, the low temperature at the strip head results in high hardness and strong deformation resistance acting on the rolls, causing visible marks on the roll surface. To improve this defect, this invention proposes a rolling system and method for reducing roll marks in hot-rolled special narrow strip steel. Summary of the Invention

[0003] To address the aforementioned technical problems and overcome the shortcomings of existing technologies, this invention provides a rolling system and method for reducing roll marks in hot-rolled special narrow strip steel. By optimizing the spraying method of the mill cooling water and the water supply time control method, the head temperature of high-hardness special steel is increased, thus solving this defect.

[0004] In a first aspect, the present invention provides a rolling system for reducing roll marks in hot-rolled special narrow strip steel, specifically comprising a first rolling mill E, rolling mill F1, rolling mill F2, a second rolling mill E, rolling mill F3, rolling mill F4, rolling mill F5, rolling mill F6, rolling mill F7, rolling mill F8, and rolling mill F9 arranged sequentially from the inlet side to the outlet side; the first rolling mill E and the second rolling mill E are E-type rolling mills, and the other rolling mills are F-type rolling mills, wherein each of the F-type rolling mills is symmetrically equipped with a cooling system facing the rolling mill pressure rolls.

[0005] Furthermore, the cooling system includes an inlet pipe, a solenoid valve, and a cooling water pipe connected in sequence, wherein the inlet pipe is installed on the rolling mill, and the outlet end of the cooling water pipe faces the rolling mill pressure roll.

[0006] Secondly, the present invention also provides a rolling method for reducing rolling marks on hot-rolled special narrow strip steel, wherein the steel plate is rolled using the rolling system described in any of the embodiments of the first aspect.

[0007] Furthermore, the following steps are included to close the solenoid valves: when the steel plate enters the rolls of the preceding sequence rolling mill, the solenoid valves before and after the stand of the following sequence rolling mill are closed, so that the cooling water in the cooling water pipes stops cooling the rolls.

[0008] Furthermore, the following steps are included for opening the solenoid valves: when the steel plate enters the rolls of the next sequence rolling mill, the solenoid valves at the front and rear of the stand of the previous sequence rolling mill are opened, so that the cooling water from the cooling water pipes begins to cool the rolls.

[0009] Furthermore, by controlling the water flow switch of each rolling mill through solenoid valves, the cooling water in the cooling water pipes can be effectively used to cool the rolls, while reducing the cooling impact on the head of the steel plate.

[0010] The beneficial effects of this invention are: The rolling system and method proposed in this invention for reducing roll marks in hot-rolled special narrow strip steel, by adopting a method of cooling the rolls with hot water after the strip head is rolled, ensures the steel temperature at the head of the special steel strip, keeps the roll surface in a near-normal working state, improves the utilization rate of the rolls, improves the yield of product quality, solves the impact of high hardness and large deformation resistance caused by low temperature during strip threading on the rolls, and improves the product quality of high hardness alloy special steel. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of the rolling system for reducing roll marks on hot-rolled special narrow strip steel in a specific embodiment of the present invention; Figure 2 This is a schematic diagram of the F-type mill cooling system in the rolling system for reducing roll marks in hot-rolled special narrow strip steel according to the present invention. In the diagram: 1. Steel plate; 2. Water inlet pipe; 3. Solenoid valve; 4. Cooling water pipe; 5. First rolling mill E; 6. Rolling mill F1; 7. Rolling mill F2; 8. Second rolling mill E; 9. Rolling mill F3; 10. Rolling mill F4; 11. Rolling mill F5; 12. Rolling mill F6; 13. Rolling mill F7; 14. Rolling mill F8; 15. Rolling mill F9. Detailed Implementation

[0012] like Figure 1 As shown, this invention discloses a rolling system for reducing roll marks in hot-rolled special narrow strip steel, comprising a first rolling mill E5, a rolling mill F16, a rolling mill F27, a second rolling mill E8, a rolling mill F39, a rolling mill F410, a rolling mill F511, a rolling mill F612, a rolling mill F713, a rolling mill F814, and a rolling mill F915 arranged sequentially from the inlet side to the outlet side; the first rolling mill E5 and the second rolling mill E8 are E-type rolling mills, and the other rolling mills are F-type rolling mills, wherein each of the F-type rolling mills is symmetrically equipped with a cooling system facing the rolling mill pressure rolls.

[0013] See Figure 2 The cooling system includes an inlet pipe 2, a solenoid valve 3, and a cooling water pipe 4 connected in sequence. The inlet pipe 2 is installed on the rolling mill, and the outlet end of the cooling water pipe 4 faces the rolling mill rolls. This system controls the water flow switch of each rolling mill stand through the solenoid valve 3, thereby controlling the cooling water in the cooling water pipe 4 to effectively cool the rolls and reduce the cooling impact on the head of the steel plate 1 (high-strength special steel at around 1050℃).

[0014] The present invention also discloses a rolling method for the aforementioned rolling system for reducing rolling roll marks on hot-rolled special narrow strip steel, wherein the rolling system is used to roll the steel plate 1.

[0015] The closing principle of the solenoid valves is as follows: When steel plate 1 enters the roll of the first rolling mill E5, the solenoid valve 3 before and after the 6th stand of the rolling mill F1 closes, stopping the cooling water from the cooling water pipe 4 from cooling the roll; when steel plate 1 enters the 6th roll of the rolling mill F1, the solenoid valve 3 before and after the 2nd stand of the rolling mill F2 closes, stopping the cooling water from the cooling water pipe 4 from cooling the roll; and so on. When steel plate 1 enters the 13th roll of the rolling mill F7, the solenoid valve 3 before and after the 14th stand of the rolling mill F8 closes, stopping the cooling water from the cooling water pipe 4 from cooling the roll; when steel plate 1 enters the 14th roll of the rolling mill F8, the solenoid valve 3 before and after the 15th stand of the rolling mill F9 closes, stopping the cooling water from the cooling water pipe 4 from cooling the roll.

[0016] The opening principle of the solenoid valves is as follows: When steel plate 1 enters the roll 7 of mill F2, the solenoid valve 3 before and after the 6th stand of mill F1 opens, allowing the cooling water from the cooling water pipe 4 to begin cooling the roll; when steel plate 1 enters the roll of mill E8, the solenoid valve 3 before and after the 7th stand of mill F2 opens, allowing the cooling water from the cooling water pipe 4 to begin cooling the roll; and so on. When steel plate 1 enters the roll 15 of mill F9, the solenoid valve 3 before and after the 14th stand of mill F8 opens, allowing the cooling water from the cooling water pipe 4 to begin cooling the roll; when steel plate 1 enters the roll of mill F9, the solenoid valve 3 before the 15th stand of mill F9 opens, allowing the cooling water from the cooling water pipe 4 to begin cooling the roll.

[0017] In addition to the embodiments described above, the present invention may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A rolling system for reducing roll marks of hot rolling of special narrow strip steel, characterized by, The mill includes, in sequence from the inlet side to the outlet side, the first mill E (5), the mill F1 (6), the mill F2 (7), the second mill E (8), the mill F3 (9), the mill F4 (10), the mill F5 (11), the mill F6 (12), the mill F7 (13), the mill F8 (14), and the mill F9 (15); the first mill E (5) and the second mill E (8) are E-type mills, and the other mills are F-type mills, wherein each of the F-type mills is symmetrically equipped with a cooling system facing the mill pressure rolls.

2. The rolling system according to claim 1, characterized in that The cooling system includes an inlet pipe (2), a solenoid valve (3), and a cooling water pipe (4) connected in sequence, wherein the inlet pipe (2) is installed on the rolling mill, and the outlet end of the cooling water pipe (4) faces the rolling mill pressure roll.

3. A rolling method for reducing roll marks in hot-rolled special narrow strip steel, characterized in that, The steel plate (1) is rolled using the rolling system described in claim 1 or 2.

4. The rolling method according to claim 3, characterized in that, It also includes the following steps for closing the solenoid valve (3): when the steel plate (1) enters the roll of the preceding sequence rolling mill, the solenoid valve (3) in front of and behind the stand of the following sequence rolling mill is closed, so that the cooling water in the cooling water pipe (4) stops cooling the roll.

5. The rolling method according to claim 3, characterized in that, It also includes the following steps for opening the solenoid valve (3): when the steel plate (1) enters the roll of the next sequence rolling mill, the solenoid valve (3) in front of and behind the stand of the previous sequence rolling mill is opened, so that the cooling water in the cooling water pipe (4) begins to cool the roll.

6. The rolling method according to claim 3, characterized in that, The water flow switch of each mill is controlled by the solenoid valve (3), and the cooling water in the cooling water pipe (4) is controlled to cool the rolls, while reducing the cooling effect on the head of the steel plate (1).

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