Method for rolling fixed-weight billets to fixed lengths under hot-rolling process of square billets

Abstract

This invention belongs to the field of hot-rolled billet, and relates to a method for rolling fixed-weight billets to fixed-length billets under the hot-rolled billet process. Based on the billet (weight) length corresponding to the rolling specification, the length ranges of A and B lines are tracked and statistically analyzed when rolling different specifications. The length range values ​​of A and B lines corresponding to each specification are set in L2. By tracking the A and B line lengths of each flow of billet, the flow with abnormal rolling length is identified, and the continuous casting end is notified to adjust the cutting length of the billet from the problematic flow, so that the billet from that flow reaches the target rolling length, thereby reducing the amount of non-fixed length.

Description

Technical Field

[0001] This invention belongs to the field of hot-rolled billet, and relates to a method for rolling fixed-weight billets into fixed-length products under the hot-rolled billet process. Background Technology

[0002] The current hot-rolling process of Chongqing Iron & Steel is as follows: No. 7 casting machine → flame cutting machine → post-cutting heat preservation roller conveyor → lifting baffle (temperature measurement in front of the baffle) → collecting roller conveyor → high-speed roller conveyor → passing through heating furnace → scrap removal device → rolling on double high-speed bar mill. The process involves L1, L2, and L3 process control systems.

[0003] Under the hot-feed direct rolling process of the No. 7 casting machine-double high-strength bar production line, the temperature differences between streams (the maximum temperature difference is close to 50℃) and the temperature differences between the head, middle and tail of a single billet cause instability in the rolling length between billets, resulting in an increase in non-standard lengths. At the same time, our company has not implemented a fixed weight device and uses a uniform billet size (170×170×11900mm) for rolling, which causes the length allowance of each specification to be inconsistent under the extreme negative deviation. Among them, the tail length of the large specifications (φ18mm, φ20mm) is about 4 meters, which leads to an increase in non-standard lengths. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a method for rolling fixed-weight billets into fixed-length billets under a hot-rolling process for square billets. By tracking the length difference of the A and B lines of each flow of billet rolling, the flow with abnormal rolling length is identified, and the cutting length (weight) of the billet in that flow is adjusted so that the billet in that flow reaches the target rolling length, thereby reducing the amount of non-fixed length.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for rolling fixed-weight billets to fixed-length sheets under a hot-rolling process, employing an L1, L2, and L3 process control system, comprising the following steps:

[0006] S1, the continuous casting end assigns a billet material number to each billet through the L2 process control system, and sends the material number information to the rolling end; the continuous casting and rolling L2 interfaces display the billet conveying trajectory and the current billet material number in real time;

[0007] S2, calculate the theoretical billet length and weight corresponding to different rolling specifications, adjust the billet length to conduct batch tests, and then explore the optimal length range of A and B lines when rolling different specifications, and set the A and B line length judgment values ​​corresponding to each specification at the rolling end L2.

[0008] S3. When the billet is directly fed into the rolling mill, hot sampling is required every 20 minutes at the rolling end to track and monitor the negative deviation of the finished product, and adjust the material size in a timely manner to reduce the impact of the material size fluctuation on the length values ​​of lines A and B.

[0009] S4, display the rolling length values ​​of lines A and B in steel rolling L2, and assign L2 the decision logic;

[0010] S41, when the rolling length of lines A and B exceeds the judgment value, the rolling length values ​​of lines A and B are displayed in red, and the casting machine flow number is displayed simultaneously;

[0011] S42. When three consecutive slabs in the same flow have a length of A and B lines that exceeds the judgment value, the buzzer alarm will sound. The operator will immediately notify the continuous casting end to adjust the cutting length of the slab in the problematic flow. After adjustment, the rolling will be tracked until the length of A and B lines of the slab in the problematic flow reaches the judgment value requirement.

[0012] S5, the billet material number and billet flow number corresponding to the rolling information are uploaded to the steel rolling L3 interface.

[0013] The beneficial effects of this invention are as follows: Based on the billet (weight) length corresponding to the rolling specification, this invention tracks and statistically analyzes the range of A and B line lengths when rolling different specifications, and sets the range of A and B line lengths corresponding to each specification in L2; by tracking the A and B line lengths of each flow of cast billets, it identifies the flow with abnormal rolling length, and notifies the continuous casting end to adjust the cutting length of the billet of the problematic flow, so that the billet of that flow reaches the target rolling length, thereby reducing the amount of non-standard length.

[0014] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0015] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0016] Figure 1 This is a schematic diagram of the process of the present invention. Detailed Implementation

[0017] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0018] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0019] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0020] Please see Figure 1 The method for rolling fixed-weight billets to fixed-length sheets under the hot-rolling process of square billets includes the following steps:

[0021] 1. The continuous casting end assigns each billet an identification number—the billet material number—through the L2 process control system, and simultaneously sends the material number information to the rolling end; the continuous casting and rolling L2 interfaces display the billet conveying trajectory and the current billet material number (the material number includes information such as the specific flow number) in real time;

[0022] 2. Calculate the theoretical billet length (weight) corresponding to different rolling specifications, adjust the billet length to conduct batch tests, and then explore the optimal length range of A and B lines (lowest non-fixed length quantity) when rolling different specifications, and set the A and B line length judgment value (range value) corresponding to each specification at the rolling end L2.

[0023] 3. When the billet is directly fed into the rolling mill, hot sampling is required every 20 minutes at the rolling end to track and monitor the negative deviation of the finished product, adjust the material size in a timely manner, and reduce the impact of the fluctuation of the rolled material size on the length values ​​of lines A and B.

[0024] 4. Display the rolling length values ​​of lines A and B (black numbers) in the L2 display of the steel rolling mill, and assign L2 decision logic:

[0025] ① When the rolling length of lines A and B exceeds the judgment value, the rolling length values ​​of lines A and B are displayed in red, and the casting machine flow number is displayed simultaneously.

[0026] ② If three consecutive slabs in the same flow have a length of A and B lines that exceeds the judgment value, the buzzer will sound an alarm. The operator will immediately notify the continuous casting end to adjust the cutting length of the slabs in the problematic flow. After adjustment, the rolling will be tracked until the length of A and B lines of the slabs in the problematic flow reaches the judgment value (displayed in black).

[0027] 5. Upload the billet material number and billet flow number corresponding to the rolling information to the steel rolling L3 interface.

[0028] In this embodiment, the non-standard length rate of the double high-strength bar production line is reduced from 0.70% to 0.65%, thereby improving the standard length yield and reducing production costs; the real-time adjustment of the length of each flow billet in the casting billet is realized, ensuring the stability of the length of the A and B lines of the rolled product and reducing the scrap rate.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for rolling fixed-weight billets to fixed-length sheets under a hot-conveying direct rolling process, employing an L1, L2, L3 process control system, characterized in that... Includes the following steps: S1, the continuous casting end assigns a billet material number to each billet through the L2 process control system, and sends the material number information to the rolling end; the continuous casting and rolling L2 interfaces display the billet conveying trajectory and the current billet material number in real time; S2, calculate the theoretical billet length and weight corresponding to different rolling specifications, adjust the billet length to conduct batch tests, and then explore the optimal length range of A and B lines when rolling different specifications, and set the A and B line length judgment values ​​corresponding to each specification at the rolling end L2. S3. When the billet is directly fed into the rolling mill, hot sampling is required every 20 minutes at the rolling end to track and monitor the negative deviation of the finished product, and adjust the material size in a timely manner to reduce the impact of the material size fluctuation on the length values ​​of lines A and B. S4, display the rolling length values ​​of lines A and B in steel rolling L2, and assign L2 the decision logic; S41, when the rolling length of lines A and B exceeds the judgment value, the rolling length values ​​of lines A and B are displayed in red, and the casting machine flow number is displayed simultaneously; S42. When three consecutive slabs in the same flow have a length of A and B lines that exceeds the judgment value, the buzzer alarm will sound. The operator will immediately notify the continuous casting end to adjust the cutting length of the slab in the problematic flow. After adjustment, the rolling will be tracked until the length of A and B lines of the slab in the problematic flow reaches the judgment value requirement. S5, the billet material number and billet flow number corresponding to the rolling information are uploaded to the steel rolling L3 interface.

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