阅读说明：本技术 一种超高强钢的酸连轧生产方法及酸连轧机组 (Acid continuous rolling production method of ultrahigh-strength steel and acid continuous rolling unit ) 是由 任新意 高慧敏 车鸿奎 齐海峰 李冉 徐海卫 于孟 王晓东 郑艳坤 王希硕 卢杰 于 2020-04-16 设计创作，主要内容包括：本发明一种超高强钢的酸连轧生产方法及酸连轧机组,酸连轧机组全部机架采用压下模式进行超高强带钢轧制,这样,在进行超高强钢轧制时,可以控制每个机架的轧制力小于该机架能承受的最大轧制力,不会因超出机架轧制力负荷导致无法生产超高强带钢。为了保证超高强钢的板形,在轧制过程中,通过控制酸连轧机组最后一个机架的辊缝,使最后一个机架与前一个机架间的张力死区在预设范围内,如果轧制的带钢的当前厚度与目标厚度差间的厚度差大于预设厚度,基于该厚度差,调整最后一个机架的辊缝和前一个机架的辊速,以确保轧制的超高强带钢的厚度满足生产要求。可以有效减少因机架超过轧制负荷导致无法生产超高强带钢的问题,保证带钢板形和板厚良好。(The invention relates to an acid continuous rolling production method of ultrahigh-strength steel and an acid continuous rolling unit. In order to ensure the plate shape of the ultra-high strength steel, in the rolling process, the roll gap of the last frame of the acid continuous rolling unit is controlled, so that the tension dead zone between the last frame and the previous frame is in a preset range, and if the thickness difference between the current thickness and the target thickness difference of the rolled strip steel is larger than the preset thickness, the roll gap of the last frame and the roll speed of the previous frame are adjusted based on the thickness difference, so that the thickness of the rolled ultra-high strength strip steel meets the production requirement. The problem that the ultrahigh-strength strip steel cannot be produced due to the fact that the stand exceeds the rolling load can be effectively solved, and the strip shape and the plate thickness of the strip steel are good.)

1. An acid continuous rolling production method of ultrahigh-strength steel is characterized by being applied to an acid continuous rolling unit and comprising the following steps of:

controlling all the frames of the acid continuous rolling unit to roll the ultrahigh-strength strip steel in a screw-down mode, wherein the rolling force of each frame is controlled to be smaller than the maximum rolling force which can be borne by the frame during rolling;

in the rolling process, controlling the roll gap of the last frame of the acid continuous rolling unit to enable the tension dead zone between the last frame and the previous frame to be within a preset range;

in the rolling process, if the thickness difference between the current thickness and the target thickness difference of the rolled strip steel is larger than the preset thickness, based on the thickness difference, the roll gap of the last rack and the roll speed of the previous rack are adjusted, so that the thickness difference between the adjusted thickness of the rolled strip steel and the target thickness is smaller than or equal to the preset thickness difference.

2. The method of claim 1, wherein the method further comprises:

and controlling the working roll of the last rack to roll by adopting a grinding roll, wherein the surface roughness of the grinding roll is within the range of 1.0um-1.4 um.

3. The method of claim 1, wherein the method further comprises:

and controlling all the frames of the acid continuous rolling unit to roll by adopting a positive crown roll-type working roll.

4. The method of any one of claims 1-3, further comprising:

and in the rolling process, controlling a first emulsion tank to provide emulsion of the last rack, and controlling a second emulsion tank to provide emulsion of other racks except the last rack, wherein the emulsion concentration of the first emulsion tank is within a range of 3.5-4.0%, and the emulsion concentration of the second emulsion tank is within a range of 0.8-1.2%.

5. The method of any one of claims 1 to 3, wherein said adjusting the roll gap of the last stand and the roll speed of the previous stand based on the thickness difference if the thickness difference between the current thickness and the target thickness difference of the rolled steel strip is greater than a preset thickness comprises:

and if the difference value between the current thickness and the target thickness is larger than the preset thickness, reducing the roller speed of the previous frame and reducing the roller gap of the last frame.

6. An acid continuous rolling mill train for producing an ultra-high strength steel, comprising a processor and a memory, the memory storing a program for executing the method for producing an ultra-high strength steel according to any one of claims 1 to 5, the processor being configured to execute the program stored in the memory.

7. The acid continuous rolling mill train according to claim 6, wherein the work rolls of the last stand of the acid continuous rolling mill train are rolled using grinding rolls having a surface roughness in the range of 1.0um to 1.4 um.

8. The acid continuous rolling mill train according to claim 6, wherein all stands of the acid continuous rolling mill train roll with positive crown roll type work rolls.

9. The continuous acid rolling mill train according to any one of claims 6 to 8, further comprising a first emulsion tank providing the emulsion of the last stand and a second emulsion tank providing the emulsion of the remaining stands other than the last stand, wherein the emulsion concentration of the first emulsion tank is in the range of 3.5 to 4.0% and the emulsion concentration of the second emulsion tank is in the range of 0.8 to 1.2%.

10. Computer storage medium for storing computer software instructions for use in the method according to any one of claims 1 to 5, comprising a program designed for carrying out the method for the production of ultra-high strength steel by acid continuous rolling.

Technical Field

The invention relates to the technical field of cold rolling, in particular to an acid continuous rolling production method of ultrahigh-strength steel and an acid continuous rolling unit.

Background

The cold-rolled high-strength steel plate has the advantages of high weight reduction potential, high fatigue strength, high formability and the like, and the improvement of the strength and the reduction of the thickness of the strip steel for the automobile are important development trends for realizing the light weight and high performance of the automobile. However, the increase of the yield strength of the strip steel and the reduction of the thickness of the finished product of the strip steel bring about the problem that the rolling load in the production process of the strip steel is increased and even exceeds the limit process capability of production line equipment, so that the strip steel cannot be normally produced.

In the prior art of a certain acid continuous rolling unit, a rolling production mode of front frame pressing and last frame pressing is adopted, so that the rolling force of partial frames exceeds the limit rolling force of production line equipment, and the development of the variety and specification of a production line is limited.

Disclosure of Invention

The embodiment of the invention provides an acid continuous rolling production method of ultrahigh-strength steel and an acid continuous rolling unit, which are used for solving the problem that the ultrahigh-strength steel cannot be produced or the quality of the produced ultrahigh-strength steel is poor due to the fact that part of a rack exceeds load when the acid continuous rolling unit in the prior art produces the ultrahigh-strength steel.

In a first aspect, the invention provides an acid continuous rolling production method of ultrahigh-strength steel, which is applied to an acid continuous rolling unit and comprises the following steps:

controlling all the frames of the acid continuous rolling unit to roll the ultrahigh-strength strip steel in a screw-down mode, wherein the rolling force of each frame is controlled to be smaller than the maximum rolling force which can be borne by the frame during rolling;

in the rolling process, controlling the roll gap of the last frame of the acid continuous rolling unit to enable the tension dead zone between the last frame and the previous frame to be within a preset range;

in the rolling process, if the thickness difference between the current thickness and the target thickness difference of the rolled strip steel is larger than the preset thickness, based on the thickness difference, the roll gap of the last rack and the roll speed of the previous rack are adjusted, so that the thickness difference between the adjusted thickness of the rolled strip steel and the target thickness is smaller than or equal to the preset thickness difference.

Optionally, the method further includes:

and controlling the working roll of the last rack to roll by adopting a grinding roll, wherein the surface roughness of the grinding roll is within the range of 1.0um-1.4 um.

Optionally, the method further includes:

and controlling all the frames of the acid continuous rolling unit to roll by adopting a positive crown roll-type working roll.

Optionally, the method further includes:

and in the rolling process, controlling a first emulsion tank to provide emulsion of the last rack, and controlling a second emulsion tank to provide emulsion of other racks except the last rack, wherein the emulsion concentration of the first emulsion tank is within a range of 3.5-4.0%, and the emulsion concentration of the second emulsion tank is within a range of 0.8-1.2%.

Optionally, if the thickness difference between the current thickness and the target thickness difference of the rolled strip steel is greater than the preset thickness, adjusting the roll gap of the last stand and the roll speed of the previous stand based on the thickness difference, including:

and if the difference value between the current thickness and the target thickness is larger than the preset thickness, reducing the roller speed of the previous frame and reducing the roller gap of the last frame.

In a second aspect, the present invention provides an acid continuous rolling mill train for producing ultra-high strength steel, comprising a processor and a memory, wherein the memory is used for storing a program for executing the method for producing ultra-high strength steel by acid continuous rolling in the first aspect, and the processor is configured to execute the program stored in the memory.

Optionally, the working roll of the last frame of the acid continuous rolling mill set adopts a grinding roll for rolling, and the surface roughness of the grinding roll is within the range of 1.0um-1.4 um.

Optionally, all the stands of the acid continuous rolling mill set adopt positive crown roll-type working rolls for rolling.

Optionally, the acid continuous rolling mill unit further includes a first emulsion tank and a second emulsion tank, the first emulsion tank provides the emulsion of the last frame, and the second emulsion tank provides the emulsions of the other frames except the last frame, wherein the emulsion concentration of the first emulsion tank is within a range of 3.5-4.0%, and the emulsion concentration of the second emulsion tank is within a range of 0.8-1.2%.

In a second aspect, the present invention provides a computer storage medium for storing computer software instructions for the method of the first aspect, comprising a program designed for executing the above aspect for the method of producing ultra-high strength steel by acid continuous rolling.

One or more technical solutions in the embodiments of the present application have at least one or more of the following technical effects:

in the technical scheme of the embodiment of the invention, all the frames of the acid continuous rolling unit adopt a pressing mode to roll the ultrahigh-strength strip steel, so that the rolling force of each frame can be controlled to be smaller than the maximum rolling force which can be borne by the frame when the ultrahigh-strength strip steel is rolled, and the condition that the ultrahigh-strength strip steel cannot be produced due to the fact that the rolling force load of the frame is exceeded is avoided. Further, because the last stand also adopts a pressing-down mode, the plate shape is not controlled by adopting a flattening rolling mode like the prior art, in order to ensure the plate shape of the ultrahigh-strength steel, in the rolling process, the roll gap of the last stand of the acid continuous rolling unit is controlled, so that the tension dead zone between the last stand and the previous stand is in a preset range, and if the thickness difference between the current thickness and the target thickness difference of the rolled strip steel is greater than the preset thickness, the roll gap of the last stand and the roll speed of the previous stand are adjusted based on the thickness difference, so that the thickness difference between the thickness of the rolled strip steel after adjustment and the target thickness is less than or equal to the preset thickness difference, and the thickness of the rolled ultrahigh-strength strip steel is ensured to meet the production requirement. The acid continuous rolling production method of the ultrahigh-strength steel in the embodiment can effectively reduce the problem that the ultrahigh-strength strip steel cannot be produced due to the fact that the stand exceeds the rolling load, can exert the production capacity of the high-strength steel of the production line of the acid continuous rolling mill to the maximum extent, and ensures that the plate shape and the plate thickness of the product are good.

Drawings

Fig. 1 is a flowchart of an acid continuous rolling production method for ultra-high strength steel according to a first embodiment of the present application;

FIG. 2 is a schematic view of a roll profile of a work roll employed in a stand of a tandem acid rolling mill train according to a first embodiment of the present application;

fig. 3 is a schematic diagram of an acid continuous rolling mill train according to a second embodiment of the present application.

Detailed Description

The embodiment of the invention provides an acid continuous rolling production method of ultrahigh-strength steel and an acid continuous rolling unit, which are used for solving the problem that the ultrahigh-strength steel cannot be produced or the quality of the produced ultrahigh-strength steel is poor due to the fact that part of a rack exceeds load when the acid continuous rolling unit in the prior art produces the ultrahigh-strength steel. The acid continuous rolling production method of the ultrahigh-strength steel comprises the following steps: controlling all frames of the acid continuous rolling unit to roll the ultrahigh-strength strip steel in a screw-down mode, wherein the rolling force of each frame is controlled to be smaller than the maximum rolling force which can be borne by the frame when rolling is performed; in the rolling process, controlling the roll gap of the last frame of the acid continuous rolling unit to enable the tension dead zone between the last frame and the previous frame to be within a preset range; and if the thickness difference between the current thickness of the rolled strip steel and the target thickness difference is larger than the preset thickness, adjusting the roll gap of the last rack and the roll speed of the previous rack based on the thickness difference, so that the thickness difference between the adjusted rolled strip steel and the target thickness is smaller than or equal to the preset thickness difference.

The technical solutions of the present invention are described in detail below with reference to the drawings and specific embodiments, and it should be understood that the specific features in the embodiments and examples of the present invention are described in detail in the technical solutions of the present application, and are not limited to the technical solutions of the present application, and the technical features in the embodiments and examples of the present application may be combined with each other without conflict.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.