阅读说明：本技术 一种用于提高热轧板带钢变形均匀性的蛇形差温轧制方法 (Snakelike differential temperature rolling method for improving deformation uniformity of hot rolled plate strip steel ) 是由 江连运 黄金博 甄涛 马立峰 卫垚宇 赵春江 于 2020-06-15 设计创作，主要内容包括：本发明公开一种用于提高热轧板带钢变形均匀性的蛇形差温轧制方法,通过异步轧制在变形区形成搓轧区,搓轧区所产生的剪应力促进变形由表层向中心传递；在异步轧制的基础上将慢速工作辊沿轧制方向移动或将快速工作辊沿轧制的反方向移动,形成搓轧区和反弯区,利用反弯区的反弯力抑制板带钢弯曲,形成蛇形轧制；在轧前对钢板实行超快速冷却,形成“外硬内软”的变形抗力分布,在蛇形轧制的基础上增设差温轧制形成蛇形差温轧制；蛇形差温轧制的区域形成轧制变形区,在轧制变形区内施加高频脉冲电流。本发明充分利用异步轧制、蛇形轧制、差温轧制和脉冲电流的共同作用来提高板带钢厚度方向变形的均匀性,同时保证轧后板形良好。(The invention discloses a snake-shaped differential temperature rolling method for improving the deformation uniformity of hot rolled plate strip steel, wherein a rolling area is formed in a deformation area through asynchronous rolling, and the shear stress generated in the rolling area promotes the deformation to be transferred from a surface layer to the center; on the basis of asynchronous rolling, moving a slow working roll along the rolling direction or moving a fast working roll along the opposite direction of rolling to form a rolling area and a reverse bending area, and inhibiting the bending of the plate strip steel by utilizing the reverse bending force of the reverse bending area to form snake-shaped rolling; performing ultra-fast cooling on a steel plate before rolling to form deformation resistance distribution of 'hard outside and soft inside', and additionally performing differential temperature rolling on the basis of serpentine rolling to form serpentine differential temperature rolling; the area of the snake-shaped differential temperature rolling forms a rolling deformation area, and high-frequency pulse current is applied in the rolling deformation area. The invention fully utilizes the combined action of asynchronous rolling, snake-shaped rolling, differential temperature rolling and pulse current to improve the uniformity of the deformation of the plate and strip steel in the thickness direction and simultaneously ensure good plate shape after rolling.)

1. A snakelike differential temperature rolling method for improving the deformation uniformity of hot rolled plate strip steel is characterized by comprising the following steps of: forming a rolling area in the deformation area by asynchronous rolling, wherein the shear stress generated in the rolling area promotes the deformation to be transferred from the surface layer to the center;

on the basis of asynchronous rolling, moving a slow working roll along the rolling direction or moving a fast working roll along the opposite direction of rolling to form a rolling area and a reverse bending area, and inhibiting the bending of the plate strip steel by utilizing the reverse bending force of the reverse bending area to form snake-shaped rolling;

carrying out ultra-fast cooling on plate strip steel before rolling to form deformation resistance distribution of 'hard outside and soft inside', and additionally arranging differential temperature rolling on the basis of serpentine rolling to form serpentine differential temperature rolling;

the area of the snake-shaped differential temperature rolling forms a rolling deformation area, high-frequency pulse current is applied to the rolling deformation area, the actual contact area of the surface of the plate strip steel and a roller is increased, the shearing force of a contact interface is improved, and deformation is promoted to be transferred from the surface layer to the centripetal portion by means of the shearing force.

2. The serpentine differential temperature rolling method for improving the uniformity of hot rolled sheet strip deformation according to claim 1, wherein: the shape of the plate is regulated and controlled by the asymmetrical arrangement of the cooling strength of the upper surface and the lower surface of the plate strip steel through differential temperature rolling.

3. The serpentine differential rolling method for improving the uniformity of deformation of hot rolled sheet strip as claimed in claim 2 wherein: when the plate band steel is bent upwards after the snake-shaped differential temperature rolling, the cooling strength of the lower surface of the plate band steel is improved, so that the lower surface layer metal generates tensile stress, or the cooling strength of the upper surface of the plate band steel is reduced, the tensile stress of the upper surface layer metal is reduced, and the plate band steel after the rolling becomes straight.

4. The utility model provides a snakelike differential temperature rolling device for improving hot rolling plate belted steel warp homogeneity which characterized in that: the strip mill comprises a hot-rolled strip steel (1), a rolling mill front roller way (2), a rolling mill front ultra-fast cooling device (3), a pulse current device (4), a reversible strip mill (5), a rolling mill rear ultra-fast cooling device (6) and a rolling mill rear roller way (7), wherein the rolling mill front roller way (2) is arranged at the inlet side of the reversible strip mill (5), the rolling mill rear roller way (7) is arranged at the outlet side of the reversible strip mill (5), the rolling mill front ultra-fast cooling device (3) is arranged between the rolling mill front roller way (2) and the reversible strip mill (5), the rolling mill rear ultra-fast cooling device (6) is arranged between the rolling mill rear roller way (7) and the reversible strip mill (5), and the reversible strip mill (5) comprises a lower working roll operation side bearing seat (5-5), a lower working roll (5-4), The lower working roll driving side pushing mechanism is further arranged on the lower working roll driving side of the reversible plate strip rolling mill (5), the lower working roll driving side pushing mechanism and the lower working roll driving side pushing mechanism are symmetrically arranged on two sides of the central line of the lower working roll (5-4), and the operation side ends of the upper working roll (5-6) and the lower working roll (5-4) are respectively connected with the positive pole and the negative pole of the output end of the pulse current device (4) through the positive pole and the negative pole of the output end of the pulse current device (4) And (6) connecting.

5. The serpentine differential temperature rolling device for improving the uniformity of deformation of hot rolled sheet strip as claimed in claim 4 wherein: the total length of the front roller way (2) and the rear roller way (7) of the rolling mill is determined according to the longest length of the strip steel.

6. The serpentine differential temperature rolling device for improving the uniformity of deformation of hot rolled sheet strip as claimed in claim 4 wherein: the front ultrafast cooling device (3) of the rolling mill is positioned at the inlet side of the reversible plate strip rolling mill (5), the rear ultrafast cooling device (6) of the rolling mill is positioned at the outlet side of the reversible plate strip rolling mill (5), and the front ultrafast cooling device (3) of the rolling mill and the rear ultrafast cooling device (6) of the rolling mill are symmetrically arranged.

7. The serpentine differential temperature rolling device for improving the uniformity of deformation of hot rolled sheet strip as claimed in claim 4 wherein: roller table (2) includes a plurality of roller (2-1) before the rolling mill, ultrafast cooling device (3) includes nozzle (3-1) and nozzle (3-2) under the ultrafast cooling before the rolling mill, nozzle (3-2) set up between adjacent roller (2-1) under the ultrafast cooling before the machine, nozzle (3-1) and roller table (2) correspond the setting from top to bottom before the ultrafast cooling before the machine, ultrafast cooling device (3) before the rolling mill with the structure of ultrafast cooling device (6) behind the rolling mill is the same.

8. The serpentine differential temperature rolling device for improving the uniformity of deformation of hot rolled sheet strip as claimed in claim 4 wherein: and the lower working roll transmission side propelling mechanism and the lower working roll operation side propelling mechanism have the same structure.

9. The serpentine differential temperature rolling device for improving the uniformity of deformation of hot rolled sheet strip as claimed in claim 4 wherein: the rolling mill stand (5-2) is provided with a blind hole, and the rolling mill inlet side piston cylinder (5-1) and the rolling mill outlet side piston cylinder (5-3) are installed on the blind hole of the rolling mill stand (5-2).

Technical Field

The invention relates to the technical field of hot rolled plate strip steel production, in particular to a snake-shaped differential temperature rolling method for improving the deformation uniformity of hot rolled plate strip steel.

Background

The hot rolled strip steel, especially the thick hot rolled high strength strip steel has the problems of uneven deformation from the surface layer to the core part and low mechanical property of the core part caused by insufficient deformation of the core part, and generally adopts a mode of increasing the total compression ratio in order to improve the mechanical property of the core part and improve the deformation uniformity in the thickness direction. However, due to the restriction of the biting capacity of the rolling mill and the size of the blank, the problems of insufficient core deformation and uneven structure performance caused by the difficulty in reaching the process requirement of the compression ratio are one of the key technical bottlenecks for improving the quality of the hot-rolled strip steel.

Disclosure of Invention

The invention aims to provide a snakelike differential temperature rolling method for improving the deformation uniformity of hot rolled plate strip steel, which is used for solving the problems in the prior art, improving the deformation uniformity of the plate strip steel in the thickness direction and ensuring good plate shape after rolling.

In order to achieve the purpose, the invention provides the following scheme: the invention provides a snake-shaped differential temperature rolling method for improving the deformation uniformity of hot rolled plate strip steel, wherein a rolling area is formed in a deformation area through asynchronous rolling, and the shear stress generated in the rolling area promotes the deformation to be transferred from a surface layer to the center;

on the basis of asynchronous rolling, moving a slow working roll along the rolling direction or moving a fast working roll along the opposite direction of rolling to form a rolling area and a reverse bending area, and inhibiting the bending of the plate strip steel by utilizing the reverse bending force of the reverse bending area to form snake-shaped rolling;

carrying out ultra-fast cooling on plate strip steel before rolling to form deformation resistance distribution of 'hard outside and soft inside', and additionally arranging differential temperature rolling on the basis of serpentine rolling to form serpentine differential temperature rolling;

the area of the snake-shaped differential temperature rolling forms a rolling deformation area, high-frequency pulse current is applied to the rolling deformation area, the actual contact area of the surface of the plate strip steel and a roller is increased, the shearing force of a contact interface is improved, and deformation is promoted to be transferred from the surface layer to the centripetal portion by means of the shearing force.

Preferably, the shape of the plate is regulated and controlled by the asymmetrical arrangement of the cooling strength of the upper surface and the lower surface of the plate strip steel through differential temperature rolling.

Preferably, when the plate strip steel is bent upwards after the serpentine differential temperature rolling, the cooling strength of the lower surface of the plate strip steel is improved, so that the lower surface layer metal generates tensile stress, or the cooling strength of the upper surface of the plate strip steel is reduced, so that the tensile stress of the upper surface layer metal is reduced, and the plate strip steel becomes straight after the serpentine differential temperature rolling.

A snakelike differential temperature rolling device for improving the deformation uniformity of hot rolled plate strip steel comprises the hot rolled plate strip steel, a rolling mill front roller way, a rolling mill front ultrafast cooling device, a pulse current device, a reversible strip rolling mill, a rolling mill rear ultrafast cooling device and a rolling mill rear roller way, wherein the rolling mill front roller way is arranged at the inlet side of the reversible strip rolling mill, the rolling mill rear roller way is arranged at the outlet side of the reversible strip rolling mill, the rolling mill front ultrafast cooling device is arranged between the rolling mill front roller way and the reversible strip rolling mill, the rolling mill rear ultrafast cooling device is arranged between the rolling mill rear roller way and the reversible strip rolling mill, the reversible strip rolling mill comprises a lower working roll operation side bearing seat, a lower working roll and an upper working roll, the lower working roll operation side bearing seat is positioned at the lower working roll operation side of the reversible strip rolling mill, and lower working roll operation side pushing mechanisms are respectively arranged at the two sides of the lower working roll operation side bearing seat, the lower working roll operation side propelling mechanism consists of two rolling mill inlet side piston cylinders and two rolling mill outlet side piston cylinders, the lower working roll transmission side of the reversible plate strip rolling mill is further provided with a lower working roll transmission side propelling mechanism, the lower working roll transmission side propelling mechanism and the lower working roll operation side propelling mechanism are symmetrically arranged on two sides of the central line of the lower working roll, and the operation side ends of the upper working roll and the lower working roll are respectively connected with the positive electrode and the negative electrode of the output end of the pulse current device.

Preferably, the total length of the front roller way and the rear roller way of the rolling mill is determined according to the longest length of the rolled plate strip steel.

Preferably, the front ultrafast cooling device of the rolling mill is positioned at an inlet side of the reversible plate and strip rolling mill, the rear ultrafast cooling device of the rolling mill is positioned at an outlet side of the reversible plate and strip rolling mill, and the front ultrafast cooling device of the rolling mill and the rear ultrafast cooling device of the rolling mill are symmetrically arranged.

Preferably, the roller way includes a plurality of roller before the rolling mill, ultrafast cooling device includes that the ultrafast is cold nozzle and the ultrafast is cold down the nozzle before the machine before the rolling mill, the ultrafast is cold down the nozzle setting before the machine is adjacent between the roller, the ultrafast is cold nozzle before the machine with the roller way corresponds the setting from top to bottom before the rolling mill, ultrafast cooling device before the rolling mill with the structure of ultrafast cooling device behind the rolling mill is the same.

Preferably, the lower working roll transmission side propelling mechanism and the lower working roll operation side propelling mechanism have the same structure.

Preferably, the rolling mill frame is provided with a blind hole, and the rolling mill inlet side piston cylinder and the rolling mill outlet side piston cylinder are arranged on the blind hole of the rolling mill frame.

The invention discloses the following technical effects: (1) the invention can improve the difficult problems of low deformation degree and poor deformation uniformity of the core part of hot rolled plate strip steel, especially thick plate strip steel; (2) the invention can be slightly modified on the basis of the original rolling line, and the arrangement and the process of a production line cannot be influenced; (3) the invention combines the snake-shaped rolling and the differential temperature rolling, and can ensure good plate shape under the working condition of asymmetric rolling by means of the snake-shaped rolling reverse bending area and the asymmetric arrangement of the ultra-fast cooling strength of the upper surface and the lower surface of the plate strip steel on the basis of improving the deformation uniformity.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

FIG. 1 is a schematic diagram of the serpentine differential rolling of the present invention;

FIG. 2 is a schematic diagram of the serpentine differential temperature pulse current action of the present invention;

FIG. 3 is a schematic structural diagram of a serpentine differential temperature rolling device for improving the deformation uniformity of hot-rolled plate strip steel according to the present invention;

FIG. 4 is an enlarged view of a portion I of FIG. 3;

FIG. 5 is an enlarged view of the operational side of II in FIG. 3;

FIG. 6 is a partial enlarged view of the drive side II of FIG. 3;

fig. 7 is a sectional view taken along line a-a in fig. 5.

Wherein, 1 is hot-rolled plate strip steel; 2, a rolling mill front roller way; 2-1 is a roller; 3, a rolling mill front ultra-fast cooling device; 3-1 is a front ultrafast cooling upper nozzle; 3-2 is a front ultrafast cooling lower nozzle; 4 is a pulse current device; 5 is a reversible plate and strip mill; 5-1 is a piston cylinder at the inlet side of the rolling mill; 5-2 is a rolling mill frame; 5-3 is a piston cylinder at the outlet side of the rolling mill; 5-4 is a lower working roll; 5-5 is a bearing block at the operation side of the lower working roll; 5-6 are upper working rolls; 5-7 are upper supporting rollers; 5-8 are lower supporting rollers; 5-9 is a bearing block at the transmission side of the lower working roll; 6 is a rolling mill rear ultra-fast cooling device; and 7, a rolling mill rear roller way.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Referring to fig. 1-2, the invention provides a snake-shaped differential temperature rolling method for improving the deformation uniformity of hot rolled plate strip steel, wherein a rolling area is formed in a deformation area by asynchronous rolling, and the higher shearing stress generated in the rolling area can promote the deformation to be transferred from a surface layer to the center, so that the deformation uniformity in the thickness direction is improved. However, in order to solve the problem of bending of the plate strip steel after rolling due to the fact that linear speeds of upper and lower working rolls in asynchronous rolling are not consistent, on the basis of asynchronous rolling, a slow working roll is moved for a certain distance along the rolling direction or a fast working roll is moved for a certain distance along the opposite direction of rolling to form a rolling area and a reverse bending area, and the reverse bending force of the reverse bending area is utilized to restrain the plate strip steel from bending to form snake-shaped rolling.

The problems of insufficient core deformation and nonuniform deformation in the thickness direction of the plate strip steel can be solved by adopting differential temperature rolling, namely, the plate strip steel is subjected to ultra-fast cooling before rolling on the basis of the traditional rolling to form deformation resistance distribution of 'hard outside and soft inside', deformation is promoted to be transmitted from a surface layer to a central area, the core deformation and the deformation uniformity are improved, the differential temperature rolling is additionally arranged on the basis of the serpentine rolling to form serpentine differential temperature rolling, as shown in figure 1, so that the capability of jointly improving the core deformation degree and the deformation uniformity of the plate strip steel is achieved.

The bending problem of the plate strip steel caused by the snake-shaped differential temperature rolling can also be realized by means of the function of the differential temperature rolling in the aspect of plate shape regulation, namely, the asymmetric arrangement of the cooling strength of the upper surface and the lower surface of the plate strip steel is fully utilized to regulate and control the plate shape. For example, when the plate strip steel is bent upwards after the snake-shaped differential temperature rolling, the cooling strength of the lower surface of the plate strip steel can be improved, so that the lower surface layer metal generates higher tensile stress, or the cooling strength of the upper surface of the plate strip steel is reduced, the tensile stress of the upper surface layer metal is reduced, and the plate strip steel after the rolling becomes straight.

Referring to fig. 2, on the basis of snake-shaped differential temperature rolling, high-frequency pulse current is applied in a rolling deformation zone to soften the hardened surface layer of the plate and strip steel due to ultra-fast cooling, so that the actual contact area of the surface of the plate and strip steel and a roller can be increased from the contact tribology perspective, the shearing force of a contact interface is improved, and deformation is promoted to be transmitted from the surface layer to the radial part by virtue of the shearing force.

Therefore, the combined action of asynchronous rolling, snake rolling, differential temperature rolling and pulse current is fully utilized to improve the uniformity of the deformation of the plate and strip steel in the thickness direction and ensure good plate shape after rolling.

Referring to fig. 3-5, a serpentine differential temperature rolling method for improving the deformation uniformity of hot-rolled plate strip steel, the related equipment and the arrangement thereof are shown in fig. 3, and mainly comprise: the device comprises a hot-rolled plate strip steel 1, a rolling mill front roller way 2, a rolling mill front ultra-fast cooling device 3, a pulse current device 4, a reversible plate strip rolling mill 5, a rolling mill rear ultra-fast cooling device 6 and a rolling mill rear roller way 7.

Referring to fig. 3-4, a rolling mill front roller way 2 and a rolling mill rear roller way 7 are respectively arranged at the inlet side and the outlet side of the reversible strip rolling mill 5, and the total length of the rolling mill front roller way 2 and the rolling mill rear roller way 7 is determined according to the longest length of the rolled strip steel; a front ultrafast cooling lower nozzle 3-2 is arranged between adjacent rollers 2-1 of a front roller way 2 of the rolling mill, a front ultrafast cooling upper nozzle 3-1 capable of realizing 90-degree turnover is arranged above the front roller way 2 of the rolling mill, a certain number of the front ultrafast cooling upper nozzles 3-1 and the front ultrafast cooling lower nozzles 3-2 form a front ultrafast cooling device 3 of the rolling mill, and the front ultrafast cooling device 3 is tightly close to the inlet side of a reversible plate strip rolling mill 5 when being installed; the rear ultrafast cooling device 6 of the rolling mill and the front ultrafast cooling device 3 of the rolling mill are symmetrically arranged at two sides of the reversible plate strip rolling mill to form differential temperature rolling.

Referring to fig. 3 and 5 to 7, lower work roll 5-4 operation side advancing mechanisms composed of two roll inlet side piston cylinders 5-1 and two roll outlet side piston cylinders 5-3 are provided on both sides of a lower work roll operation side bearing housing 5-5 of a reversible sheet strip rolling mill 5, lower work roll 5-4 transmission side advancing mechanisms composed of two roll inlet side piston cylinders 5-1 and two roll outlet side piston cylinders 5-3 are provided on both sides of a lower work roll transmission side bearing housing 5-9 of the reversible sheet strip rolling mill 5, the lower work roll 5-4 operation side advancing mechanisms and the lower work roll 5-4 transmission side advancing mechanisms have the same structure (see fig. 5 and 6), and are symmetrically arranged on both sides of the center line of a lower work roll 5-4 (see fig. 7), blind holes are processed in a mill housing 5-2 for mounting the roll inlet side piston cylinders 5-1 and the roll outlet side piston cylinders 5-3 (see fig. 7) The cylinders 5-3 can realize the dislocation between the lower working roll 5-4 and the upper working roll 5-6 by controlling the positions and the pressures of the piston cylinders 5-1 at the inlet side of the rolling mill and the piston cylinders 5-3 at the outlet side of the rolling mill, so that the snake-shaped rolling is formed. The front ultrafast cooling device 3 and the rear ultrafast cooling device 6 are respectively arranged at two sides of a reversible plate strip rolling mill 5 with a lower working roll 5-4 propelling mechanism, and the snake-shaped rolling device and the differential temperature rolling device are combined to form snake-shaped differential temperature rolling.

Referring to fig. 2, 3 and 5, the operation side ends of the upper working roll 5-6 and the lower working roll 5-4 are respectively connected with the anode and the cathode of the output end of the pulse current device 4, and the insulation of the upper working roll 5-6 and the lower working roll 5-4, the upper supporting roll 5-7, the lower supporting roll 5-8, the rolling mill frame 5-2 and other peripheral objects is simultaneously made, the pulse current device 4 is used for carrying out local ultra-fast heating on the hot-rolled strip steel 1 in the deformation zone, softening the surface layer hardened due to ultra-fast cooling, improving the shear stress of the deformation zone, promoting the deformation to be transferred from the surface layer to the heart part, and achieving the purpose of improving the deformation uniformity of the hot-rolled strip steel 1 in the thickness direction under the combined action of snakelike differential temperature rolling.

Referring to fig. 1 and 3, the problem of bending of the strip steel occurs due to the non-uniform linear velocities of the upper work rolls 5-6 and the lower work rolls 5-4 in the serpentine rolling. On one hand, a special reverse bending area of snake rolling formed by dislocation between the upper working rolls 5-6 and the lower working rolls 5-4 is utilized to achieve the purpose of inhibiting the bending of the hot rolled plate strip steel 1; on the other hand, the shape of the rolled plate can be regulated by the aid of the front ultrafast cooling device 3 and the rear ultrafast cooling device 6 of the rolling mill, namely the shape of the plate can be regulated by fully utilizing the asymmetrical arrangement of the cooling strength of the upper surface and the lower surface of the plate strip steel. For example, when the hot rolled plate strip 1 is bent upwards after the serpentine differential temperature rolling, the cooling strength of the lower surface of the hot rolled plate strip 1 can be improved, so that the lower surface layer metal of the hot rolled plate strip 1 generates higher tensile stress, or the cooling strength of the upper surface of the hot rolled plate strip 1 is reduced, the tensile stress of the upper surface layer metal of the hot rolled plate strip 1 is reduced, so that the rolled plate strip becomes straight, and the good plate shape is ensured.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.