A method for improving the width uniformity of a hot-rolled tail of a width-adjusted slab

Abstract

The present application relates to the technical field of steel rolling process, and particularly relates to a method for improving the width uniformity of a hot-rolled width-adjusted blank head and tail, comprising the following steps: S1. Marking the width-adjusted blank in a steelmaking process, and the marking content comprises the width of the width-adjusted blank head and tail and the width-adjusted starting position; S2. Receiving the marking content in an integrated system in a hot-rolling process, performing a head adjustment on the width-adjusted blank, and recording the maximum width value of the width-adjusted blank; S3. When planning production, arranging production according to the maximum width value of the width-adjusted blank; S4. Receiving the width of the width-adjusted blank head and tail in a secondary model of the hot-rolling process, if the head width is wider than the tail width, performing S5, if the head width is narrower than the tail width, sequentially performing S2, S3 and S4; S5. Sending the width-adjusted blank into a width-setting machine, and the width-setting machine calculates the side pressure of the head and tail respectively according to the marking content of the width-adjusted blank, and determines the running times of the hammer head in the regions before and after the width-adjusted starting position, so as to obtain a finished product with uniform width. The present application effectively reduces the production of narrow-size waste products.

Description

Technical Field

[0001] This invention relates to the field of steel rolling technology, and specifically to a method for improving the uniformity of the width at the head and tail of hot-rolled wide billets. Background Technology

[0002] In the field of steel rolling technology, product specification diversity is one of the prominent features of modern hot rolling production lines. Benxi Steel's 2300 hot rolling production line, as a typical example, needs to produce products of various specifications. During the steelmaking process, widened billets are widely used because they can flexibly adapt to different specification requirements. However, there are still key unresolved issues with widened billets in the hot rolling production process, which adversely affect production efficiency and product quality.

[0003] In existing technologies, Benxi Steel's 2300 hot-rolling production line lacks effective means to identify whether incoming materials are width-adjusted billets. Furthermore, width-adjusted billets exhibit significant characteristics, with substantial differences in width between their heads and tails. During rolling, the head and tail of the strip show marked differences due to variations in horizontal elongation and recovery, directly leading to narrow-length issues at the head or tail of the finished strip, resulting in scrap. This situation not only reduces product yield and wastes steel resources but also increases production costs and weakens product market competitiveness due to scrap generation.

[0004] Based on the above problems, this invention proposes a method to improve the uniformity of the head and tail width of hot-rolled wide billets. Summary of the Invention

[0005] To address the aforementioned technical problem of difficulty in identifying widened billets, leading to narrow-length scrap, this invention provides a method to improve the uniformity of the width at the head and tail of hot-rolled widened billets. By applying a widened billet width control method, this invention improves the accuracy of width control for widened billet products, thereby increasing the product yield.

[0006] The technical means employed in this invention are as follows:

[0007] A method for improving the width uniformity of hot-rolled widened billets at both ends includes the following steps:

[0008] S1. The steelmaking process marks the widened billet, and the marking content includes the width of the beginning and end of the widened billet and the starting position of the widening. The marking content is then uploaded to the integrated system.

[0009] S2. The hot rolling process receives the marked content in the integrated system, turns the width-adjusting billet around, ensures that the wider end of the width-adjusting billet enters the production line as the head, and records the maximum width value of the width-adjusting billet.

[0010] S3. When planning production, production should be scheduled according to the maximum width value of the adjusted blank;

[0011] S4. The secondary model of the hot rolling process receives the width of the head and tail of the adjustable billet transmitted by the integrated system, and checks whether the width of the head of the adjustable billet is wider than the width of the tail. If the width of the head is wider than the width of the tail, execute S5; if the width of the head is narrower than the width of the tail, execute S2, S3 and S4 in sequence.

[0012] S5. The width-adjusting billet is fed into the width-fixing machine. The width-fixing machine calculates the lateral pressure at the head and tail according to the markings on the width-adjusting billet, and determines the number of times the hammer runs in the area before and after the width-adjusting start position to obtain a finished product with a consistent width.

[0013] Furthermore, the width difference between the head and tail of the width-adjusting blank does not exceed 150mm.

[0014] Furthermore, in the human-machine interface of the hot rolling process, the width adjustment billet mark is highlighted with a special color.

[0015] Furthermore, the pre-delivery inspection page of the human-machine interface for the hot rolling process marks the head and tail width values ​​of the widened billet.

[0016] Furthermore, the head side pressure of the width-fixing machine does not exceed the maximum side pressure capacity of the equipment, and the tail side pressure of the width-fixing machine is not less than 20mm.

[0017] Furthermore, the width of the finished product is less than the minimum width of the width-adjusted blank.

[0018] Furthermore, the method for calculating the lateral pressure at the head and tail is as follows:

[0019] By calculating the slope of the change in the side pressure of the hammer head of the width-fixing machine through the differences in the inlet width, outlet width, dog bone recovery, width adjustment start position, and width of the width-adjusting billet head and tail, the side pressure of the head and tail can be obtained.

[0020] Furthermore, the method for calculating the number of times the hammer head runs in the region before and after the initial width adjustment position is as follows:

[0021] The number of times the hammer runs in the area before and after the width adjustment starting position is calculated by the step length of each run of the width-fixing machine and the length of the billet.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. This method achieves precise control over the entire process of widening billet production, from steelmaking mark upload and hot rolling turn-off scheduling to model program optimization and width-fixing press parameter adaptation. This significantly improves the width control accuracy of widening billet products, effectively reduces the generation of narrow-length scrap products due to head-to-tail width differences, and greatly increases product yield.

[0024] 2. This invention combines the value difference between finished products and scrap steel. Actual production verification has shown that it can significantly improve the product yield and create considerable economic benefits for enterprises. Calculated based on product value and scrap steel price difference, it can substantially increase annual efficiency.

[0025] Based on the above reasons, this invention can be widely promoted in fields such as steel rolling processes. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a flowchart illustrating a method for improving the uniformity of the head and tail width of a hot-rolled widened billet according to the present invention. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0029] like Figure 1 As shown, the present invention provides a method for improving the width uniformity of the head and tail of hot-rolled widened billets, the specific steps of which are as follows:

[0030] S1. The steelmaking process marks the widened billet, and the marking content includes the width of the beginning and end of the widened billet and the starting position of the widening. The marking content is then uploaded to the integrated system.

[0031] S2. The hot rolling process receives the markings in the integrated system, turns the width-adjusting billet around to ensure that the wider end of the billet enters the production line as the head, and records the maximum width value of the width-adjusting billet.

[0032] S3. When planning production, schedule production according to the maximum width of the adjusted billet. At the same time, limit the width of the finished product to be less than the minimum width of the adjusted billet.

[0033] S4. The secondary model of the hot rolling process receives the width of the head and tail of the adjustable billet transmitted by the integrated system, and checks whether the width of the head of the adjustable billet is wider than the width of the tail. If the width of the head is wider than the width of the tail, execute S5; if the width of the head is narrower than the width of the tail, execute S2, S3 and S4 in sequence.

[0034] Furthermore, the model program receives integrated data. In this program segment, only the widths of the head and tail are compared, and the head width value is guaranteed to be greater than the tail width value.

[0035] S5. The width-adjusting billet is fed into the width-fixing machine. The width-fixing machine calculates the lateral pressure at the head and tail according to the markings on the width-adjusting billet, and determines the number of times the hammer runs in the area before and after the width-adjusting start position to obtain a finished product with a consistent width.

[0036] The calculation methods for the lateral pressure at the head and tail are as follows:

[0037] By calculating the slope of the change in the side pressure of the hammer head of the width-fixing machine through the differences in the inlet width, outlet width, dog bone recovery, width adjustment start position, and width of the width-adjusting billet head and tail, the side pressure of the head and tail can be obtained.

[0038] The method for calculating the number of times the hammer head runs in the region before and after the initial width adjustment position is as follows:

[0039] The number of times the hammer head runs in the area before and after the width adjustment starting position is calculated based on the step length of each run of the width-fixing machine and the length of the billet.

[0040] Using this control method, after exiting the width-fixing mill, the billet shape is narrow at the head and wide at the tail, but the head's "dog bone" (the narrower portion of the billet) is larger than the tail's. After horizontal rolling, the head's "dog bone" recovers to a greater extent than the tail's "dog bone," thus obtaining a finished product with consistent head and tail width.

[0041] Furthermore, the head side pressure of the width-fixing machine shall not exceed the maximum side pressure capacity of the equipment, and the tail side pressure of the width-fixing machine shall not be less than 20mm.

[0042] In a preferred embodiment of the present invention, the width difference between the head and tail of the width-adjusting billet does not exceed 150mm.

[0043] In a preferred embodiment of the present invention, the human-machine interface (HMI) screen for the hot rolling process uses a special color to highlight the width adjustment billet mark. The head and tail width values ​​of the width adjustment billet are marked on the main input data page (PDI page) of the hot rolling process's HMI screen.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for improving the uniformity of the width at the head and tail of a hot-rolled, widened billet, characterized in that, Includes the following steps: S1. The steelmaking process marks the widened billet, and the marking content includes the width of the beginning and end of the widened billet and the starting position of the widening. The marking content is then uploaded to the integrated system. S2. The hot rolling process receives the marked content in the integrated system, turns the width-adjusting billet around, ensures that the wider end of the width-adjusting billet enters the production line as the head, and records the maximum width value of the width-adjusting billet. S3. When planning production, production should be scheduled according to the maximum width value of the adjusted blank; S4. The secondary model of the hot rolling process receives the width of the head and tail of the adjustable billet transmitted by the integrated system, and checks whether the width of the head of the adjustable billet is wider than the width of the tail. If the width of the head is wider than the width of the tail, execute S5; if the width of the head is narrower than the width of the tail, execute S2, S3 and S4 in sequence. S5. The width-adjusting billet is fed into the width-fixing machine. Based on the markings on the width-adjusting billet, the width-fixing machine calculates the lateral pressure at the head and tail, and determines the number of times the hammer travels in the area before and after the width-adjusting starting position, thus obtaining a finished product with a consistent width. The width of the finished product is less than the minimum width of the width-adjusted billet, and the calculation method for the side pressure at the head and tail is as follows: By calculating the slope of the change in the side pressure of the hammer head of the width-fixing machine through the differences in the inlet width, outlet width, dog bone recovery, width adjustment start position, and width of the width-adjusting billet head and tail, the side pressure of the head and tail can be obtained.

2. The method for improving the uniformity of the head and tail width of hot-rolled adjustable-width billets according to claim 1, characterized in that, The width difference between the head and tail of the width-adjusting billet shall not exceed 150mm.

3. The method for improving the uniformity of the head and tail width of hot-rolled adjustable-width billets according to claim 1, characterized in that, In the human-machine interface of the hot rolling process, the width adjustment billet mark is highlighted with a special color.

4. The method for improving the uniformity of the head and tail width of hot-rolled adjustable-width billets according to claim 3, characterized in that, The pre-delivery inspection page of the human-machine interface for the hot rolling process marks the head and tail width values ​​of the widened billet.

5. The method for improving the uniformity of the head and tail width of hot-rolled adjustable-width billets according to claim 1, characterized in that, The head side pressure of the width-fixing machine shall not exceed the maximum side pressure capacity of the equipment, and the tail side pressure of the width-fixing machine shall not be less than 20mm.

6. The method for improving the uniformity of the head and tail width of hot-rolled adjustable-width billets according to claim 1, characterized in that, The method for calculating the number of times the hammer head travels in the region before and after the initial width adjustment position is as follows: The number of times the hammer runs in the area before and after the width adjustment starting position is calculated by the step length of each run of the width-fixing machine and the length of the billet.

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