Bar rolling method
Patent Information
- Application Number
- CN202511799413.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-02
- Publication Date
- 2026-08-18
AI Technical Summary
[0004]然而，上述现有轧件后区处理工艺在实际应用过程中仍存在不足之处，严重影响了生产效益和产品质量
[0015] The bar rolling method of this invention, through optimized design of the multiple-length flying shear exit and expansion section, can prevent abnormal situations such as sudden drop at the head and tail of the rolled piece, avoiding shearing of the tail of the multiple-length section during fixed-length cutting. This improves the quality of bar products and the yield of bar shearing, and enhances the economic efficiency of production. Through overall application, this can increase the yield of rebar by 0.2% and reduce costs.
Smart Images
Figure CN122583376A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of metal smelting technology, and specifically relates to a method for rolling bar stock. Background Technology
[0002] In the bar rolling process, the post-rolling processing flow has a significant impact on product quality, production efficiency, and material utilization. Currently, the industry-standard post-rolling processing flow mainly includes four key steps: long-length shearing, cooling on an upper cooling bed, alignment on an alignment roller table, and fixed-length cold shearing. These steps are sequentially linked to transform the rolled piece from a long-length semi-finished product into a qualified fixed-length product.
[0003] Specifically, the first step is a multiple-length shearing process. The length of the steel billet after rolling is typically around 1000 meters. Since this length far exceeds the load-bearing and cooling capacity of the cooling bed, direct cooling is not possible. Therefore, it needs to be sheared into 100-meter segments to ensure the length meets the cooling bed's process requirements, laying the foundation for subsequent cooling processes. Next, the segments enter the upper cooling bed cooling process. After being conveyed to the cooling bed, the segments move slowly using the rack and pinion mechanism. During this movement, the segments come into full contact with air, gradually reducing their temperature from approximately 900℃ to 400℃ through air cooling, thus achieving temperature regulation to meet the physical property requirements of subsequent processing. The next step is the alignment roller alignment process. Due to the uncertainty in the movement and placement of the segments on the cooling bed, there are significant differences between the front and rear ends of multiple segments. To facilitate precise operation in the subsequent length-cutting process, the segments need to be conveyed to the alignment rollers for unidirectional alignment, ensuring the consistency of the segments' ends. Finally, the fixed-length cold shearing process is carried out. In this process, the aligned multiple-length rolled pieces are first cut off, including the tail of each rolled piece and the ends that are not qualified in appearance, such as the bent sections caused by previous process problems. Then, the multiple-length rolled pieces are cut into fixed-length rolled pieces according to the preset fixed length, and finally the products that meet the delivery standards are formed.
[0004] However, the existing post-rolling processing technology still has shortcomings in practical applications, seriously affecting production efficiency and product quality. The ends of multiple-length rolled pieces are prone to bending and need to be cut off, resulting in material waste. The existing multiple-length shears have structural design flaws, especially in the unreasonable design of the inlet and outlet sections, leading to widespread bending at the ends of multiple-length rolled pieces after shearing. These bent portions cannot meet the requirements of subsequent processing and product quality and must be cut off during the fixed-length cold shearing process, directly causing unnecessary loss of steel raw materials. Summary of the Invention
[0005] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention provides a method for rolling bar stock, with the purpose of improving the quality of bar stock products and the economic efficiency of production.
[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a bar rolling method, including a multiple-length flying shear shearing process, a cooling bed cooling process, and an alignment roller alignment process. In the multiple-length flying shear shearing process, the rolled piece is sheared by a multiple-length flying shear. The multiple-length flying shear includes an exit guide groove, which includes a first guide section and a second guide section arranged sequentially along the rolling direction of the rolled piece. The bottom guide surface of the first guide section is inclined downwards, and the included angle between the bottom guide surface of the first guide section and the bottom guide surface of the second guide section is not greater than a preset angle, which is 3°. In the multiple-length flying shear shearing process, the rolled piece is guided into the second guide section by the bottom guide surface of the first guide section.
[0007] The area of the inlet end of the first guide part is larger than the area of the inlet end of the second guide part, and the outlet end of the first guide part is connected to the inlet end of the second guide part.
[0008] The first guide portion is provided with a first top surface opposite to the bottom guide surface. The first top surface is located above the bottom guide surface, and the distance between the first top surface and the bottom guide surface gradually decreases along the rolling direction.
[0009] The second guide portion is provided with a second top surface opposite to the bottom guide surface. The second top surface is located above the bottom guide surface, and the distance between the second top surface and the bottom guide surface gradually decreases along the rolling direction.
[0010] The bottom guide surface of the second guide part is horizontally set.
[0011] In the alignment process of the alignment roller conveyor, the movement of the rolled piece is blocked by a primary alignment baffle and a secondary alignment baffle.
[0012] In the alignment process of the alignment roller table, according to the preset control strategy, the tail multiple length rolled piece is lifted upward by the set secondary alignment top and tail device, so that the height of the tail multiple length rolled piece is greater than the height of the primary alignment baffle. Finally, the secondary alignment baffle blocks the tail multiple length rolled piece from continuing to move.
[0013] The secondary alignment top and tail device includes a lifting mechanism, a support base, and a support roller mounted on the support base. The support base is mounted on the lifting mechanism, and the support roller is provided with a groove for embedding the tail multiple length rolled piece.
[0014] The difference between the slope a2 of the secondary alignment baffle and the slope a1 of the primary alignment baffle is 5~15°, that is, a2=a1+5°~15°. The slope a2 of the secondary alignment baffle refers to the angle between the length direction of the secondary alignment baffle and the reference plane. The slope a1 of the primary alignment baffle refers to the angle between the length direction of the primary alignment baffle and the reference plane. The reference plane is a vertical plane perpendicular to the length direction of the tail-length rolled piece.
[0015] The bar rolling method of this invention, through optimized design of the multiple-length flying shear exit and expansion section, can prevent abnormal situations such as sudden drop at the head and tail of the rolled piece, avoiding shearing of the tail of the multiple-length section during fixed-length cutting. This improves the quality of bar products and the yield of bar shearing, and enhances the economic efficiency of production. Through overall application, this can increase the yield of rebar by 0.2% and reduce costs. Attached Figure Description
[0016] This manual includes the following figures, which illustrate the following: Figure 1 This is a flowchart of the bar rolling method of the present invention; Figure 2 This is a schematic diagram of the outlet guide channel setup; Figure 3 This is a schematic diagram of the secondary alignment top and tail device; Figure 4 This is a schematic diagram showing the setup of the primary alignment baffle and the secondary alignment baffle; The markings in the diagram are as follows: 1. First guide section; 2. Second guide section; 3. First top surface; 4. Second top surface; 5. Bottom guide surface of the first guide section; 6. Bottom guide surface of the second guide section; 7. Flying scissor blade; 8. Support base; 9. Support roller; 10. Primary alignment baffle; 11. Secondary alignment baffle. Detailed Implementation
[0017] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solutions of the present invention, and to facilitate its implementation.
[0018] It should be noted that in the following embodiments, the terms "first" and "second" do not represent an absolute distinction in structure and / or function, nor do they represent the order of execution, but are merely for the convenience of description.
[0019] like Figure 1As shown, this embodiment of the invention provides a bar rolling method, including a rolling process, a multiple-length flying shear shear process, a cooling bed cooling process, an alignment roller alignment process, and a fixed-length cold shear shear process. First, in the rolling process, the entire steel billet is rolled by a sizing mill, resulting in a rolled piece approximately 1000 meters in length, which is quite long. Then, in the multiple-length flying shear shear process, the rolled piece is cut into multiple-length sections by a multiple-length flying shear. Since the cooling bed cannot cool this length of rolled piece, it is cut into 100-meter segments by the multiple-length flying shear, ensuring the length meets the cooling bed requirements. Next, in the cooling bed cooling process, the multiple-length rolled piece is cooled by a rack and pinion stepping motion on the cooling bed, undergoing air cooling during the movement, reducing the temperature from 900℃ to 400℃. Because the position of the rolled piece on the cooling bed is not fixed and there are differences between the front and back, an alignment roller alignment process is set up to facilitate subsequent shearing. In the alignment roller alignment process, alignment baffles align the ends of multiple multiple-length rolled pieces, preventing deviations in product length after shearing and meeting the fixed-length specification requirements. Finally, in the fixed-length cold shear shear process, the multiple-length rolled piece is cut by a fixed-length shear to obtain a fixed-length rolled piece. The aligned multiple-length rolled pieces are cut off at this point (removing the ends that do not meet appearance standards: the tail of each steel piece needs to be cut off), and then cut to the required length.
[0020] In embodiments of the present invention, such as Figure 2 As shown, in the multiple-length flying shear shearing process, the rolled piece is sheared by a multiple-length flying shear. The multiple-length flying shear includes an exit guide groove and flying shear blades 7. The multiple-length rolled piece after being sheared by the flying shear blades 7 enters the exit guide groove, which guides the multiple-length rolled piece to the next process for processing. The exit guide groove includes a first guide section 1 and a second guide section 2 arranged sequentially along the rolling piece's travel direction. The bottom guide surface of the first guide section 1 is inclined downwards, and the included angle β (i.e., the guide angle) between the bottom guide surface of the first guide section 1 and the bottom guide surface of the second guide section 2 is not greater than a preset angle, which is 3°. In the multiple-length flying shear shearing process, the rolled piece is guided into the second guide section 2 by the bottom guide surface of the first guide section 1. By optimizing the design of the multiple-length flying shear's inlet and outlet, the bending of the rolled piece's tail is eliminated. An expanded angle section is formed at the first guide section 1. The design of the expanded angle section can prevent abnormal situations such as sudden drop at the head and tail of the rolled piece. Moreover, the preset angle is a small angle design, which can ensure that the bending angle of the rolled piece's tail is controllable in abnormal situations.
[0021] In embodiments of the present invention, such as Figure 2As shown, the first guide part 1 is a hollow structure with openings at both ends, and its two sections are the inlet and outlet ends, respectively. The second guide part 2 is also a hollow structure with openings at both ends, and its two sections are the inlet and outlet ends, respectively. The opening area of the inlet end of the first guide part 1 is larger than that of the inlet end of the second guide part 2. The outlet end of the first guide part 1 is fixedly connected to the inlet end of the second guide part 2. The inlet end of the first guide part 1 faces the flying scissor blade 7, and the opening area of the outlet end of the first guide part 1 is the same size as the opening area of the inlet end of the second guide part 2.
[0022] In embodiments of the present invention, such as Figure 2 As shown, the first guide section 1 has a first top surface 3 opposite to the bottom guide surface 5. The first top surface 3 is located above the bottom guide surface 5, and the distance between the first top surface 3 and the bottom guide surface 5 gradually decreases along the rolling direction, which is horizontal. The second guide section 2 has a second top surface 4 opposite to the bottom guide surface 6. The second top surface 4 is located above the bottom guide surface 6, and the distance between the second top surface 4 and the bottom guide surface 6 gradually decreases along the rolling direction. The bottom guide surface 6 of the second guide section 2 is horizontal. The first guide section 1 has two ends along the length direction (i.e., the inclined extension direction) of the bottom guide surface 5, namely a low end and a high end. The height of the low end is less than the height of the high end. The high end is connected to one end of the bottom guide surface 6 of the second guide section 2, and the two ends have the same height. The distance between the low end and the flying shear blade 7 is greater than the distance between the high end and the flying shear blade 7.
[0023] In embodiments of the present invention, such as Figure 2 As shown, the horizontal distance between the end point of the rolled piece and the center of the double-length flying shear is S3 + S2 = S3 + S1 × COSβ; Wherein, S3 is the horizontal distance between the cutting edge of the flying shear blade of the double-length flying shear and the inlet end of the first guide part 1, S1 is the length of the bottom guide surface 5 of the first guide part 1, and S2 is the projected length of the bottom guide surface 5 of the first guide part 1 in the horizontal direction.
[0024] In embodiments of the present invention, such as Figure 4 As shown, in the alignment process of the alignment roller conveyor, the movement of the rolled piece is blocked by a primary alignment baffle 10 and a secondary alignment baffle 11, which are located on the same side of the cooling bed. Furthermore, as... Figure 3 As shown, in the alignment process of the alignment roller table, according to the preset control strategy, the tail multiple length rolled piece is lifted upward by the set secondary alignment top and tail device, so that the height of the tail multiple length rolled piece is greater than the height of the primary alignment baffle 10. Finally, the secondary alignment baffle 11 blocks the tail multiple length rolled piece from continuing to move.
[0025] The tail-length multiple-length rolled piece is the last multiple-length rolled piece formed after a single original rolled piece (steel billet) is sheared by a multiple-length flying shear in bar production. The initial position reference of the tail-length multiple-length rolled piece is determined after the flying shear shearing. The multiple-length rolled piece formed before the tail-length multiple-length rolled piece is of normal size and can be called the normal multiple-length rolled piece. The primary alignment baffle 10 is used to block the movement of the normal multiple-length rolled piece. The preset control strategy includes: when the tail-length multiple-length rolled piece moves to the secondary alignment top-tail device, the secondary alignment top-tail device lifts the tail-length multiple-length rolled piece upward, making it higher than the primary alignment baffle, and then the tail-length multiple-length rolled piece continues to travel a preset distance and stops at the secondary alignment baffle 11. This preset distance is 20 cm.
[0026] The tail-length multiple-length rolled piece stops at the secondary alignment baffle 11, making the tail-length multiple-length rolled piece 20 cm longer than the normal multiple-length rolled piece. During cold shearing, only the extended section of the tail-length multiple-length rolled piece (i.e. the extra 20 cm length relative to the normal multiple-length rolled piece) is removed, so that the tail-length multiple-length rolled piece can reach the same fixed length as the normal multiple-length rolled piece, avoiding excessive removal due to the irregular original length of the tail-length multiple-length, and maximizing the yield.
[0027] like Figure 3 As shown, the secondary alignment top and tail device includes a lifting mechanism, a support base 8, and a support roller 9 mounted on the support base 8. The support base 8 is mounted on the lifting mechanism, and the support roller 9 has a groove for embedding the tail-length rolled piece to ensure that the rolled piece does not deviate. The lifting mechanism mainly includes a cylinder, which is connected to the support base 8. The cylinder is used to control the vertical movement of the support base 8, and the support base 8 drives the support roller 9 to rise and fall synchronously, thereby lifting the tail-length rolled piece upward.
[0028] like Figure 4 As shown, the slope of the secondary alignment baffle 11 is greater than that of the primary alignment baffle. The difference between the slope a2 of the secondary alignment baffle 11 and the slope a1 of the primary alignment baffle is 5~15°, i.e., a2=a1+5°~15°. The slope a2 of the secondary alignment baffle 11 refers to the angle between the length direction of the secondary alignment baffle 11 and the reference plane. The slope a1 of the primary alignment baffle refers to the angle between the length direction of the primary alignment baffle and the reference plane. The reference plane is a vertical plane perpendicular to the length direction of the tail-length rolled piece. During the cooling bed stepping, the rolled piece is moved by the cooling bed moving teeth. The function of the alignment baffle is to block and position the end of the rolled piece. By setting the baffle with a slope, the rolled piece will not be dragged or bent during the cooling bed stepping process. The rolled piece can move forward smoothly under the drive of the cooling bed moving teeth, ensuring the straightness of the rolled piece and avoiding increased cutting damage due to bending during subsequent shearing.
[0029] In this embodiment of the invention, the secondary alignment design enables the separate picking, alignment, and cutting of tail steel multiple lengths, ensuring product quality while achieving the minimum value of the fixed-length cutting head.
[0030] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.
Claims
1. A bar rolling method, comprising a multiple-length flying shear shearing process, a cooling bed cooling process, and an alignment roller alignment process, wherein the multiple-length flying shear shears the rolled product using a multiple-length flying shear, the multiple-length flying shear including an exit guide groove, characterized in that, The outlet guide groove includes a first guide section and a second guide section arranged sequentially along the rolling direction. The bottom guide surface of the first guide section is inclined downward. The included angle between the bottom guide surface of the first guide section and the bottom guide surface of the second guide section is not greater than a preset angle, which is 3°. In the multiple-length flying shear cutting process, the rolling part is guided into the second guide section by the bottom guide surface of the first guide section.
2. The bar rolling method according to claim 1, characterized in that, The area of the inlet end of the first guide part is larger than the area of the inlet end of the second guide part, and the outlet end of the first guide part is connected to the inlet end of the second guide part.
3. The bar rolling method according to claim 1, characterized in that, The first guide portion is provided with a first top surface opposite to the bottom guide surface. The first top surface is located above the bottom guide surface, and the distance between the first top surface and the bottom guide surface gradually decreases along the rolling direction.
4. The bar rolling method according to claim 3, characterized in that, The second guide portion is provided with a second top surface opposite to the bottom guide surface. The second top surface is located above the bottom guide surface, and the distance between the second top surface and the bottom guide surface gradually decreases along the rolling direction.
5. The bar rolling method according to any one of claims 1 to 4, characterized in that, The bottom guide surface of the second guide part is horizontally set.
6. The bar rolling method according to any one of claims 1 to 5, characterized in that, In the alignment process of the alignment roller conveyor, the movement of the rolled piece is blocked by a primary alignment baffle and a secondary alignment baffle.
7. The bar rolling method according to claim 6, characterized in that, In the alignment process of the alignment roller table, according to the preset control strategy, the tail multiple length rolled piece is lifted upward by the set secondary alignment top and tail device, so that the height of the tail multiple length rolled piece is greater than the height of the primary alignment baffle. Finally, the secondary alignment baffle blocks the tail multiple length rolled piece from continuing to move.
8. The bar rolling method according to claim 7, characterized in that, The secondary alignment top and tail device includes a lifting mechanism, a support base, and a support roller mounted on the support base. The support base is mounted on the lifting mechanism, and the support roller is provided with a groove for embedding the tail multiple length rolled piece.
9. The bar rolling method according to claim 7, characterized in that, The difference between the slope a2 of the secondary alignment baffle and the slope a1 of the primary alignment baffle is 5~15°, that is, a2=a1+5°~15°. The slope a2 of the secondary alignment baffle refers to the angle between the length direction of the secondary alignment baffle and the reference plane. The slope a1 of the primary alignment baffle refers to the angle between the length direction of the primary alignment baffle and the reference plane. The reference plane is a vertical plane perpendicular to the length direction of the tail-length rolled piece.