CN114453428B - Method for preventing rear-end collision of strip steel in finish rolling and coiling - Google Patents
Method for preventing rear-end collision of strip steel in finish rolling and coiling Download PDFInfo
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- CN114453428B CN114453428B CN202210031884.1A CN202210031884A CN114453428B CN 114453428 B CN114453428 B CN 114453428B CN 202210031884 A CN202210031884 A CN 202210031884A CN 114453428 B CN114453428 B CN 114453428B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 152
- 239000010959 steel Substances 0.000 title claims abstract description 152
- 238000005096 rolling process Methods 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000001934 delay Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 230000003111 delayed effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/005—Control of time interval or spacing between workpieces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B33/00—Safety devices not otherwise provided for; Breaker blocks; Devices for freeing jammed rolls for handling cobbles; Overload safety devices
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Abstract
The application relates to the technical field of steel rolling, in particular to a method for preventing rear-end collision of strip steel in finish rolling coiling. The method comprises the following steps: the threading speed V1 of the strip steel in the tail end finishing mill is preset; when the tail part of the rolled strip steel passes through the front end finishing mill, when the tail part of the rolled strip steel passes through the tail end finishing mill, the real-time threading speeds V2, V3 and V4 of the rolled strip steel in the tail end finishing mill are respectively obtained when the tail part of the rolled strip steel passes through the middle finishing mill; judging whether the strip steel to be rolled enters a finishing mill group according to the numerical values of V1, V2, V3 and V4; wherein M is a positive integer, M is more than or equal to 3; the judgment condition that the finish rolling is allowed to enter steel is obtained through the real-time threading speed V1 and the real-time threading speed of the strip steel and the relative positions of the front strip steel and the rear strip steel, so that the rear-end collision accident between the finish rolling and the coiling is avoided, and the stability of the finish rolling coiling area is improved.
Description
Technical Field
The application relates to the technical field of steel rolling, in particular to a method for preventing rear-end collision of strip steel in finish rolling coiling.
Background
After entering a finish rolling and coiling chain program, the strip steel is polished by a finishing mill F1 in rolling, the strip steel in rolling continues to move along the rolling direction, and then the next strip steel is allowed to enter a finish rolling area. The main vulnerabilities that exist include: in a finishing mill group, strip steel threading speeds in different rolling mills are different; according to the production requirement, in the finish rolling procedure, the strip steel threading speed in different rolling mills is greatly changed, and the running speed of the strip steel in different rolling mills cannot be summarized simply, so that the control is difficult, the rear-end collision speed is easy to be caused, and the benign control of the rear-end collision cannot be carried out; on the other hand, at the fastest rolling pace, if the speed deviation of the strip steel between adjacent rolling mill sets or between rolling and coiling is large, rear-end collision is more likely to occur, and rear-end collision steel stacking accidents are caused.
Disclosure of Invention
The application provides a method for preventing rear-end collision of strip steel in finish rolling coiling, which aims to solve the technical problem of rear-end collision of strip steel in finish rolling coiling.
In a first aspect, the present application provides a method for preventing rear-end collision of strip steel during finish rolling coiling, wherein a finishing mill group is used, the finishing mill group includes M finishing mills, M finishing mills include a front finishing mill, a middle finishing mill and a tail finishing mill along a rolling direction, the middle finishing mill is located between the front finishing mill and the tail finishing mill, the tail finishing mill is close to the coiling machine, M is a positive integer, and M is greater than or equal to 3; the method comprises the following steps:
Obtaining a threading speed V1 of strip steel preset in the tail end finishing mill;
when the tail part of the rolled strip steel passes through the front end finishing mill, obtaining the real-time threading speed V2 of the rolled strip steel in the tail end finishing mill;
When the tail part of the rolled strip steel passes through the tail end finishing mill, obtaining the real-time threading speed V3 of the rolled strip steel in the tail end finishing mill;
when the tail part of the rolled strip steel passes through the intermediate finishing mill, obtaining the real-time threading speed V4 of the rolled strip steel in the tail end finishing mill;
and controlling whether the strip steel to be rolled enters a finishing mill group or not according to the difference value between V1 and V2, V3 and V4 respectively.
Optionally, if V2, V3 and V4 are respectively less than or equal to V1, and the difference between V1 and V2, V3 and V4 is 0m/s-1m/s, the strip steel to be rolled enters a finishing mill group.
Optionally, if V1-V2 is less than or equal to 0m/s and less than or equal to 0.5m/s, V1-V3 is less than or equal to 0.5m/s, V1-V4 is less than or equal to 0.6m/s, the strip steel to be rolled enters the finishing mill group.
Optionally, the method further comprises: and if the strip steel to be rolled is not allowed to enter the finishing mill group, adjusting the position of the strip steel to be rolled.
Optionally, the method further comprises: and if the difference between V1 and V3 is larger than 1m/s, the end finishing mill delays steel feeding.
Optionally, the method further comprises:
If V1-V3 is less than or equal to 1.5m/s and is less than or equal to 1m/s, the time delay of the tail end finishing mill is at least 5s, and the strip steel to be rolled enters a finishing mill group;
If V1-V3 is less than or equal to 1.5m/s and less than 2m/s, delaying the end finishing mill for at least 10s, and then enabling the strip steel to be rolled to enter a finishing mill group;
if the speed of the strip steel is less than or equal to 2m/s and is less than or equal to V1-V3, the time delay of the tail end finishing mill is at least 15s, and the strip steel to be rolled enters a finishing mill group.
Optionally, the M finishing mills include an F 1-FM finishing mill, and the front end finishing mill and the intermediate finishing mill are at least two finishing mills of the F1-FM-1 finishing mill.
Optionally, the first finish rolling is any finishing mill of the finishing mills F 1-FM-2.
Optionally, the intermediate finishing mill is at least one finishing mill of the F 2-FM-1 finishing mills.
Optionally, the front end finishing mill and at least one of the intermediate finishing mills are spaced apart.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
According to the method provided by the embodiment of the application, the judgment condition that the finish rolling is allowed to enter steel is obtained by comparing the threading speed V1 of the strip steel in the tail end finishing mill with the real-time threading speed of the strip steel in each finishing mill, and comparing the relative positions of the front strip steel and the rear strip steel, so that the rear-end collision accident between the finish rolling and the coiling is avoided, and the stability of the finish rolling coiling area is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic flow chart of a method for preventing rear-end collision of strip steel in finish rolling coiling according to an embodiment of the application;
Fig. 2 is a schematic diagram of a finish rolling process according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The application provides a method for preventing rear-end collision of strip steel in finish rolling coiling, as shown in figure 1, a finishing mill group is adopted, the finishing mill group comprises M finishing mills, the M finishing mills comprise a front finishing mill, a middle finishing mill and a tail end finishing mill along the rolling direction, the middle finishing mill is positioned between the front finishing mill and the tail end finishing mill, the tail end finishing mill is close to the coiling machine, M is a positive integer, M is more than or equal to 3, and the method comprises the following steps:
S1, obtaining a threading speed V1 of strip steel preset in the tail end finishing mill;
s2, when the tail part of the rolled strip steel passes through the front end finishing mill, obtaining the real-time threading speed V2 of the rolled strip steel in the tail end finishing mill;
S3, when the tail part of the rolled strip steel passes through the tail end finishing mill, obtaining real-time threading speed V3 of the rolled strip steel in the tail end finishing mill;
s4, when the tail part of the rolled strip steel passes through the intermediate finishing mill, obtaining real-time threading speed V4 of the rolled strip steel in the tail end finishing mill;
S5, controlling whether the strip steel to be rolled enters a finishing mill group or not according to the numerical values of V1, V2, V3 and V4.
According to the embodiment of the application, the calculated judgment conditions of the finish rolling allowable steel feeding are based on the positions of the front strip steel and the rear strip steel in the finishing mill and the steel throwing speed difference, so that the rear-end collision accident between the finish rolling and the coiling is avoided.
As an alternative embodiment, if V2, V3 and V4 are respectively less than or equal to V1 and the difference between V2, V3 and V4 and V1 is 0m/s-1m/s, the strip to be rolled enters a finishing mill group.
As an alternative embodiment, the method further comprises: and if the difference between V1 and V3 is larger than 1m/s, the end finishing mill delays steel feeding.
As an alternative embodiment, the method further comprises:
If V1-V3 is less than or equal to 1.5m/s and is less than or equal to 1m/s, the time delay of the tail end finishing mill is at least 5s, and the strip steel to be rolled enters a finishing mill group;
If V1-V3 is less than or equal to 1.5m/s and less than 2m/s, delaying the end finishing mill for at least 10s, and then enabling the strip steel to be rolled to enter a finishing mill group;
if the speed of the strip steel is less than or equal to 2m/s and is less than or equal to V1-V3, the time delay of the tail end finishing mill is at least 15s, and the strip steel to be rolled enters a finishing mill group.
In the embodiment of the application, if V1/S is less than or equal to 1.5m/S and V1-V3 is less than or equal to 1.5m/S, the delay of the tail end finishing mill is at least 5S, and the protection time of more than 10S can be calculated by the second strip steel and the first strip steel, so that the rear-end collision phenomenon can not occur.
In the embodiment of the application, if V1-V3 is less than or equal to 1.5m/S and less than or equal to 2m/S, the delay of the tail end finishing mill is at least 10S, and the protection time of the second strip steel and the first strip steel is more than 10S through calculation, so that the rear-end collision phenomenon is avoided. In the embodiment of the application, if the speed of the tail end finishing mill is less than or equal to 2m/S and less than or equal to V1-V3, the delay time of the tail end finishing mill is at least 15S, and the protection time of the second strip steel and the first strip steel can be more than 10S through calculation, so that the rear-end collision phenomenon is avoided.
In the embodiment of the application, the end finishing mill is subjected to delay treatment, namely, the first strip steel is fed into the finish rolling inlet after the first strip steel is fed out of the end finishing mill and delayed, and the delay treatment is required because the end finishing mill is close to the coiling machine and does not have the steel feeding condition.
As an alternative embodiment, the M finishing mills include F 1-FM finishing mills, and the front end finishing mill and the intermediate finishing mill are at least two finishing mills of the F1-FM-1 finishing mill.
As an alternative embodiment, the first finish rolling is any one of the finishing mills F 1-FM-2.
As an alternative embodiment, the intermediate finishing mill is at least one finishing mill of the F 2-FM-1 finishing mills.
As an alternative embodiment, the front end finishing mill and at least one of the intermediate finishing mills are spaced apart.
In the embodiment of the application, the reason that the front end finishing mill and the middle finishing mill are arranged at intervals is that the intervals are not arranged, and the aim of preventing rear-end collision can be achieved only by experiments with the intervals.
As an alternative embodiment, if 0m/s is less than or equal to V1-V2 is less than or equal to 0.5m/s,0m/s is less than or equal to V1-V3 is less than or equal to 0.5m/s,0.6m/s is less than or equal to V1-V4 is less than or equal to 1m/s, the strip to be rolled enters a finishing mill group.
In the embodiment of the application, V1-V2 which is more than or equal to 0m/s and less than or equal to 0.5m/s is controlled, V1-V3 which is more than or equal to 0m/s and less than or equal to 0.5m/s is controlled, V1-V4 which is more than or equal to 0.6m/s is controlled, so that two adjacent strip steels have longer time gaps and distances, and rear-end collision is avoided under the condition of ensuring the production efficiency.
As an alternative embodiment, the method further comprises: and if the strip steel to be rolled is not allowed to enter the finishing mill group, adjusting the position of the strip steel to be rolled.
In the embodiment of the application, the intermediate finishing mill is at least one finishing mill of F2-F6, and the threading speed of one finishing mill of F2-F6 is detected and compared, so that the time can be saved and the control can be reduced; the strip threading speed of a plurality of finishing mills is detected and compared, so that the control precision can be improved, and the rear-end collision phenomenon is avoided.
As an alternative embodiment, the method further comprises:
The N strips further comprise: in the rolling direction, the strip steel to be rolled after the strip steel is rolled,
And if the N strip steels are not allowed to continue to move in the finishing mill group, adjusting the positions of the strip steels to be rolled.
As an alternative embodiment, the adjusting the position of the strip to be rolled includes: and adjusting the distance of the strip steel to be rolled at the position of the high-temperature metal detection instrument.
In the embodiment of the application, the reason for swinging the strip steel to be rolled at the high-temperature metal detection instrument is that the high-temperature metal detection instrument is sensitive in detection, so that the strip steel is prevented from entering a rolling mill.
The method of the present invention will be described in detail with reference to examples, comparative examples and experimental data.
Example 1
A method for preventing rear-end collision of strip steel in finish rolling and coiling comprises the following steps:
As shown in FIG. 2, the finishing mill group 2 comprises finish rolling mills of F1-F7, strip steel 1 moves in the finishing mill group, an arrow is a rolling direction, a rolling strip steel is close to a coiling machine, a threading speed V1 set by F7 is set by the real-time speed V2 of F7 recorded by the tail part of the rolling strip steel through F1, the real-time speed V4 of F7 recorded by the tail part of the rolling strip steel through F3, the real-time speed V5 of F7 recorded by the tail part of the rolling strip steel through F5, and the real-time speed V3 of F7 recorded by the tail part of the rolling strip steel through F7 is less than or equal to 0.5M/S; V1-V4 is more than 0.5M/S and less than or equal to 0.5M/S; when 0.7M/S is less than V1-V5 and less than or equal to 1M/S and 0.6M/S is less than V1-V3 and less than or equal to 1M/S, the next strip steel is allowed to enter.
Example 2
A method for preventing rear-end collision of strip steel in finish rolling and coiling comprises the following steps:
As shown in FIG. 2, the finishing mill group 2 comprises finish rolling mills of F1-F7, strip steel 1 moves in the finishing mill group, an arrow is a rolling direction, a rolling strip steel is close to a coiling machine, a threading speed V1 set by F7 is set by the real-time speed V2 of F7 recorded by the tail part of the rolling strip steel through F1, the real-time speed V4 of F7 recorded by the tail part of the rolling strip steel through F3, the real-time speed V5 of F7 recorded by the tail part of the rolling strip steel through F5, and the real-time speed V3 of F7 recorded by the tail part of the rolling strip steel through F7 is less than or equal to 0.5M/S; V1-V4 is more than 0.5M/S and less than or equal to 0.5M/S; V1-V5 is less than or equal to 0.7M/S and less than or equal to 1M/S, when V1-V3 is less than or equal to 1.5M/S and F7 steel throwing delay is 5S, the next strip steel is allowed to enter. When the steel strip to be rolled does not allow steel feeding, the steel strip to be rolled swings at the position of the high-temperature metal detection instrument.
Example 3
A method for preventing rear-end collision of strip steel in finish rolling and coiling comprises the following steps:
As shown in FIG. 2, the finishing mill group 2 comprises finish rolling mills of F1-F7, strip steel 1 moves in the finishing mill group, an arrow is a rolling direction, a rolling strip steel is close to a coiling machine, a threading speed V1 set by F7 is set by the real-time speed V2 of F7 recorded by the tail part of the rolling strip steel through F1, the real-time speed V4 of F7 recorded by the tail part of the rolling strip steel through F3, the real-time speed V5 of F7 recorded by the tail part of the rolling strip steel through F5, and the real-time speed V3 of F7 recorded by the tail part of the rolling strip steel through F7 is less than or equal to 0.5M/S; V1-V4 is more than 0.5M/S and less than or equal to 0.5M/S; V1-V5 is less than or equal to 0.7M/S and less than or equal to 1M/S, when V1-V3 is less than or equal to 1.5M/S and less than 2M/S, F7 steel throwing delay is 10S, and the next steel strip is allowed to enter. When the steel strip to be rolled does not allow steel feeding, the steel strip to be rolled swings at the position of the high-temperature metal detection instrument.
Example 4
A method for preventing rear-end collision of strip steel in finish rolling and coiling comprises the following steps:
As shown in FIG. 2, the finishing mill group 2 comprises finish rolling mills of F1-F7, strip steel 1 moves in the finishing mill group, an arrow is a rolling direction, a rolling strip steel is close to a coiling machine, a threading speed V1 set by F7 is set by the real-time speed V2 of F7 recorded by the tail part of the rolling strip steel through F1, the real-time speed V4 of F7 recorded by the tail part of the rolling strip steel through F3, the real-time speed V5 of F7 recorded by the tail part of the rolling strip steel through F5, and the real-time speed V3 of F7 recorded by the tail part of the rolling strip steel through F7 is less than or equal to 0.5M/S; V1-V4 is more than 0.5M/S and less than or equal to 0.5M/S; V1-V5 is less than or equal to 0.7M/S and less than or equal to 1M/S, and when V1-V3 is less than or equal to 2M/S, F7 steel throwing is delayed for 15S, the next strip steel is allowed to enter. When the steel strip to be rolled does not allow steel feeding, the steel strip to be rolled swings at the position of the high-temperature metal detection instrument.
Comparative example 1
When the conventional strip steel moves in finish rolling coiling, the rear-end collision rate is about 1 part per million if the strip steel is unconstrained.
The accident rates of finish rolling and coiling of examples and comparative examples were counted, and the counted results are as follows.
Table 1 the statistics of the accident rate of finish rolling coiling in examples and comparative examples were carried out.
| Project | Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 |
| Accident rate of rear-end collision | 0 | 0 | 0 | 0 | 1 Million of |
As is clear from Table 1, the accident rate of the example group was 0 and the accident rate of the comparative example group was about 1 ppm by using the method of the present application, so that the probability of rear-end collision of the strip steel during finish rolling and coiling was effectively prevented.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A method for preventing strip steel from rear-end collision in finish rolling coiling is characterized in that a finishing mill group comprises M finishing mills, wherein the M finishing mills comprise a front finishing mill, a middle finishing mill and a tail end finishing mill along the rolling direction, the middle finishing mill is positioned between the front finishing mill and the tail end finishing mill, the tail end finishing mill is close to a coiling machine, M is a positive integer, and M is more than or equal to 3; the method comprises the following steps:
Obtaining a threading speed V1 of strip steel preset in the tail end finishing mill;
When the tail part of the rolled strip steel passes through the front end finishing mill, obtaining the real-time threading speed V2 of the rolled strip steel in the tail end finishing mill;
when the tail part of the rolled strip steel passes through the tail end finishing mill, obtaining the real-time threading speed V3 of the rolled strip steel in the tail end finishing mill;
when the tail part of the rolled strip steel passes through the intermediate finishing mill, obtaining the real-time threading speed V4 of the rolled strip steel in the tail end finishing mill;
controlling whether the strip steel to be rolled enters a finishing mill group according to the difference value between V1 and V2, V3 and V4 respectively;
if V2, V3 and V4 are respectively less than or equal to V1, and the difference value between V1 and V2, V3 and V4 is 0m/s-1m/s, the strip steel to be rolled enters a finishing mill group;
If V1-V2 is more than or equal to 0m/s and less than or equal to 0.5m/s, V1-V3 is more than or equal to 0m/s and less than or equal to 0.5m/s, V1-V4 is more than or equal to 0.6m/s, the strip steel to be rolled enters the finishing mill group;
If the difference value between V1 and V3 is more than or equal to 1m/s, the end finishing mill delays steel feeding;
If V1-V3 is less than or equal to 1.5m/s and the time delay of the tail end finishing mill is at least 5s, the strip steel to be rolled enters the finishing mill group;
if V1-V3 is less than or equal to 1.5m/s and less than 2m/s, after the end finishing mill delays for at least 10s, the strip steel to be rolled enters the finishing mill group;
If the speed of the strip steel to be rolled is less than or equal to 2m/s and less than or equal to V1-V3, the time delay of the tail end finishing mill is at least 15s, and then the strip steel to be rolled enters the finishing mill group.
2. The method according to claim 1, wherein the method further comprises: and if the strip steel to be rolled is not allowed to enter the finishing mill group, adjusting the position of the strip steel to be rolled.
3. The method of claim 1, wherein M of the finishing mills include F 1-FM finishing mills, and the front end finishing mill and the intermediate finishing mill are at least two finishing mills of F 1-FM-1 finishing mills.
4. The method of claim 1, wherein the first finish rolling is any one of the finishing mills F 1-FM-2.
5. The method of claim 1, wherein the intermediate finishing mill is at least one finishing mill of the F 2-FM-1 finishing mills.
6. The method of claim 1, wherein the front end finishing mill and at least one of the intermediate finishing mills are spaced apart.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210031884.1A CN114453428B (en) | 2022-01-12 | 2022-01-12 | Method for preventing rear-end collision of strip steel in finish rolling and coiling |
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| CN202210031884.1A CN114453428B (en) | 2022-01-12 | 2022-01-12 | Method for preventing rear-end collision of strip steel in finish rolling and coiling |
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2022
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