A co-linear production method for small H-beams and narrow strip steel

Abstract

The invention discloses a method for co-linear production of small H-beams and narrow strip steel, which relates to the technical field of H-beam and strip steel rolling production; the rolling production line of the invention is successively and continuously arranged with a rough rolling mill set, a first finishing mill set and a second finishing mill set; the rough rolling mill set includes 5 horizontal rolling mills and 2 vertical rolling mills, the first finishing mill set includes 1 vertical rolling mill and 8 universal / two-high interchangeable finishing rolling mills, and the second finishing mill set includes 4 four-high housing-type horizontal rolling mills; when rolling H-beams and I-beams, the first 3-5 rolling mills of the rough rolling mill set and the 8 finishing rolling mills of the first finishing mill set work; when rolling channel steel and angle steel, the first 3-7 rolling mills of the rough rolling mill set and at least 6 finishing rolling mills of the first finishing mill set work; when rolling strip steel, the first 6-7 rolling mills of the rough rolling mill set, the first finishing mill set and the second finishing mill set all work; the invention can realize that a same production line can produce multiple products such as H-beams, I-beams, channel steel, angle steel and strip steel.

Description

Technical Field

[0001] The present invention relates to the technical field of H-beam and strip rolling production, and specifically provides a co-linear production method for small H-beams and narrow strips. Background Art

[0002] In the late 1990s, China began to introduce international advanced equipment and built a large H-beam production line and a medium-sized H-beam production line, starting the specialized and serialized production of large and medium-sized H-beams in the country. At that time, most of the equipment on domestic ordinary section steel production lines was the horizontal three-high rolling mills built in the 1960s and 1970s, mainly producing I-beams, channels, and angles, and also producing some special-shaped section steels. The equipment level was low, the rolling line output was low, and the product quality was poor. The production capacity of section steel could no longer meet the needs of China's modernization drive.

[0003] With the continuous increase in the demand for H-beams, all the key equipment for medium and small H-beams has been domesticated, and a large number of production lines have been built in the country. On the one hand, this has filled the production capacity gap of small and medium-sized H-beams in the initial stage of H-beam application. On the other hand, since the production line can also produce I-beams (10# - 25#), channels (10# - 25#), angles (10# - 16#), etc. with comparable specifications, and the rolling line has higher production capacity, higher equipment level, and higher product quality, it is also an upgrade and transformation of the original horizontal three-high rolling mill production line for ordinary section steel.

[0004] Currently, the designed production capacity of domestic medium and small H-beam production lines has exceeded 200 million tons, and the construction of production lines is still accelerating. There is already overcapacity in some local areas, and the competition among enterprises is fierce. Therefore, whether a small H-beam production line can increase product varieties to cope with the upcoming survival pressure is an urgent issue that needs to be considered at present; thus, there is an urgent need for a co-linear production method for small H-beams and narrow strips to solve this problem. Summary of the Invention

[0005] The purpose of the present invention is to provide a co-linear production method for small H-beams and narrow strips to solve the problem of the need to broaden the product range and increase product varieties of small H-beam production lines.

[0006] To achieve the above object, the present invention provides the following technical solution: A co-linear production method for small H-beams and narrow strips, including: The rolling production line is successively and continuously arranged with a rough rolling mill set, a first finishing mill set, and a second finishing mill set; wherein the rough rolling mill set includes 5 horizontal rolling mills and 2 vertical rolling mills, the first finishing mill set includes 1 vertical rolling mill and 8 universal / two-high interchangeable finishing rolling mills, and the second finishing mill set includes 4 four-high housing-type horizontal rolling mills.

[0007] When rolling H-beams and I-beams, the first 3 - 5 rolling mills of the roughing mill train perform rolling operations along the material conveying direction, the 8 rolling mills of the first finishing mill train perform rolling operations, and the second finishing mill train passes through empty.

[0008] When rolling channel steel and angle steel, the first 3 - 7 rolling mills of the roughing mill train perform rolling operations along the material conveying direction, at least 6 rolling mills of the first finishing mill train perform rolling operations, and the second finishing mill train passes through empty.

[0009] When rolling strip steel, the first 6 - 7 rolling mills of the roughing mill train perform rolling operations along the material conveying direction, and all the rolling mills of the first finishing mill train and all the rolling mills of the second finishing mill train perform rolling operations.

[0010] Preferably, all 7 rolling mills of the roughing mill train adopt two-high short stress path rolling mills; the arrangement order of the 5 horizontal rolling mills and 2 vertical rolling mills along the material conveying direction is Horizontal Roughing Mill 1, Vertical Roughing Mill 2, Horizontal Roughing Mill 3, Vertical Roughing Mill 4, Horizontal Roughing Mill 5, Horizontal Roughing Mill 6, and Horizontal Roughing Mill 7 in sequence.

[0011] Preferably, 1 vertical rolling mill of the first finishing mill train is a two-high short stress path rolling mill, and the remaining 8 rolling mills can all be switched between two-high mode and universal mode; the arrangement order of the 1 vertical rolling mill and 8 rolling mills along the material conveying direction is Vertical Finishing Mill 1, Finishing Mill 2, Finishing Mill 3, Finishing Mill 4, Finishing Mill 5, Finishing Mill 6, Finishing Mill 7, Finishing Mill 8, and Finishing Mill 9 in sequence.

[0012] Preferably, the 4 rolling mills of the second finishing mill train are Four-High Finishing Mill 1, Four-High Finishing Mill 2, Four-High Finishing Mill 3, and Four-High Finishing Mill 4 along the material conveying direction respectively.

[0013] Preferably, between the roughing mill train and the first finishing mill train, and between the first finishing mill train and the second finishing mill train, a flying shear is respectively provided for cutting the head or segmenting.

[0014] Preferably, when rolling H-beams and I-beams, Finishing Mill 5 and Finishing Mill 8 of the first finishing mill train adopt two-high mode, and the remaining universal / two-high interchangeable finishing mills are all in universal mode; when rolling channel steel, angle steel, and strip steel, all the universal / two-high interchangeable finishing mills of the first finishing mill train adopt two-high mode.

[0015] Preferably, the rolled H-beam specifications include HN100×50 - HN250×125, HM150×100, and HW100×100 - 150×150, the I-beams include 10# - 25#; the channel steel includes 10# - 25#, and the angle steel includes 10# - 16#; the thickness range of the rolled strip steel is 1.2 - 5.0 mm, and the width is not more than 650 mm.

[0016] Preferably, the rolling production line is arranged in the section steel workshop, and strip steel finishing equipment is also arranged in the section steel workshop.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. For the co-linear production method of small H-beams and narrow strip steel, the roughing mill unit and the first finishing mill unit adopt the mill specifications, quantities, and layout forms that can be shared by H-beams and narrow strip steel. Only by adding at least 4 four-high finishing mills on the basis of the existing small H-beam production line, strip steel products with a thickness of 1.2 - 5.0 mm can be produced, without causing waste of the original mills and being easy to implement.

[0019] 2. For the co-linear production method of small H-beams and narrow strip steel, the product variety of the small H-beam production line can be increased, strip steel products can be produced, which is beneficial for rolling mills to produce different products with fewer equipment according to needs, and can save plant floor space, which is beneficial for saving production costs.

[0020] 3. For the composite production line for producing H-beams and strip steel, the roughing mill unit, the first finishing mill unit, and the second finishing mill unit are arranged continuously, with a compact structure. The floor space occupied by the strip steel finishing equipment is also relatively small, and it is relatively easy to be arranged in the section steel workshop, and no major construction is required during the transformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the rolling mill layout sequence of the rolling production line of the present invention.

[0022] In the figure: I - roughing mill unit: 1 - horizontal roughing mill 1; 2 - vertical roughing mill 2; 3 - horizontal roughing mill 3; 4 - vertical roughing mill 4; 5 - horizontal roughing mill 5; 6 - horizontal roughing mill 6; 7 - horizontal roughing mill 7;

[0023] II - first finishing mill unit: 8 - vertical finishing mill 1; 9 - finishing mill 2; 10 - finishing mill 3; 11 - finishing mill 4; 12 - finishing mill 5; 13 - finishing mill 6; 14 - finishing mill 7; 15 - finishing mill 8; 16 - finishing mill 9;

[0024] III - second finishing mill unit: 17 - four-high finishing mill 1; 18 - four-high finishing mill 2; 19 - four-high finishing mill 3; 20 - four-high finishing mill 4. DETAILED DESCRIPTION OF THE INVENTION

[0025] A co-linear production method of small H-beams and narrow strip steel, in which a rolling production line is successively and continuously arranged with a roughing mill unit, a first finishing mill unit, and a second finishing mill unit; wherein the roughing mill unit includes 5 horizontal rolling mills and 2 vertical rolling mills, the first finishing mill unit includes 1 vertical rolling mill and 8 universal / two-high interchangeable finishing mills, and the second finishing mill unit includes 4 four-high housing-type horizontal rolling mills;

[0026] When rolling H-shaped steel and I-beams, the first 3 - 5 rolling mills of the roughing mill set perform rolling operations along the material conveying direction, the 8 rolling mills of the first finishing mill set perform rolling operations, and the second finishing mill set idles through;

[0027] When rolling channel steel and angle steel, the first 3 - 7 rolling mills of the roughing mill set perform rolling operations along the material conveying direction, at least 6 rolling mills of the first finishing mill set perform rolling operations, and the second finishing mill set idles through;

[0028] When rolling strip steel, the first 6 - 7 rolling mills of the roughing mill set perform rolling operations, and all the rolling mills of the first finishing mill set and all the rolling mills of the second finishing mill set perform rolling operations.

[0029] In a preferred embodiment, all 7 rolling mills of the roughing mill set are two-high short stress path rolling mills; as Figure 1 shown, the arrangement order of 5 horizontal rolling mills and 2 vertical rolling mills along the material conveying direction is successively horizontal roughing mill one 1, vertical roughing mill two 2, horizontal roughing mill three 3, vertical roughing mill four 4, horizontal roughing mill five 5, horizontal roughing mill six 6, and horizontal roughing mill seven 7.

[0030] In a preferred embodiment, 1 vertical rolling mill of the first finishing mill set is a two-high short stress path rolling mill, and the remaining 8 rolling mills can all be switched between two-high mode and universal mode; as Figure 1 shown, the arrangement order of 1 vertical rolling mill and 8 universal / two-high interchangeable rolling mills along the material conveying direction is successively vertical finishing mill one 8, finishing mill two 9, finishing mill three 10, finishing mill four 11, finishing mill five 12, finishing mill six 13, finishing mill seven 14, finishing mill eight 15, and finishing mill nine 16.

[0031] In a preferred embodiment, as Figure 1 shown, the 4 rolling mills of the second finishing mill set along the material conveying direction are four-high finishing mill one 17, four-high finishing mill two 18, four-high finishing mill three 19, and four-high finishing mill four 20.

[0032] In addition, between the roughing mill set and the first finishing mill set, and between the first finishing mill set and the second finishing mill set, a flying shear or other cutting equipment is respectively provided for cutting the head or segmenting.

[0033] When rolling H-beams and I-beams using the above three preferred implementation methods, preferably, the horizontal roughing mill 1, vertical roughing mill 2, horizontal roughing mill 3, vertical roughing mill 4, and horizontal roughing mill 5 work. After shearing the head by the flying shear, it enters the first finishing mill unit. The 8 finishing mills in the first finishing mill unit perform rolling work. Preferably, the fifth finishing mill 12 and the eighth finishing mill 15 in the first finishing mill unit adopt the two-high roll mode, and the remaining finishing mills are all in the universal mode. The second finishing mill unit is bypassed, and the finished H-beams or I-beams are rolled. After being segmented by the flying shear, it is sent to the section steel cooling bed by the roller table for cooling. After the rolled piece is cooled on the cooling bed, it is sent to the horizontal straightening machine by the roller table for long-length straightening. After being lined up by the lining-up table, it is cut into a fixed length of 6 - 12 m by the cold sawing machine. The section steel cut into a fixed length enters the finished product table after inspection, stacking, bundling, weighing, and labeling, and is hoisted into the warehouse by the finished product bay crane. The H-beam specifications that can be processed and produced in this way mainly include HN100×50 - HN250×125, HM150×100, and HW100×100 - 150×150, and the I-beams are mainly 10# - 25#;

[0034] When rolling channel steel and angle steel using the above three preferred implementation methods, preferably, the first 3 - 7 rolling mills in the roughing mill unit along the material conveying direction perform rolling work. Preferably, the horizontal roughing mill 1, vertical roughing mill 2, horizontal roughing mill 3, vertical roughing mill 4, horizontal roughing mill 5, horizontal roughing mill 6, and horizontal roughing mill 7 all work. After shearing the head by the flying shear, it enters the first finishing mill unit. According to different product specifications and rolling process requirements, the first vertical finishing mill 8 in the first finishing mill unit may be bypassed or used, and at least 6 finishing mills participate in the rolling work. All the finishing mills in the first finishing mill unit adopt the two-high roll mode. The second finishing mill unit is bypassed, and the finished channel steel and angle steel are rolled. After being segmented by the flying shear, it is sent to the section steel cooling bed by the roller table for cooling. After the rolled piece is cooled on the cooling bed, it is sent to the horizontal straightening machine by the roller table for long-length straightening. After being lined up by the lining-up table, it is cut into a fixed length of 6 - 12 m by the cold sawing machine. The section steel cut into a fixed length enters the finished product table after inspection, stacking, bundling, weighing, and labeling, and is hoisted into the warehouse by the finished product bay crane. The section steel that can be processed and produced in this way mainly includes 10# - 25# channel steel and 10# - 16# angle steel;

[0035] When rolling strip steel using the above three preferred implementation methods, preferably, the first 6-7 rolling mills of the roughing mill train perform rolling operations along the material conveying direction. Preferably, all 7 rolling mills are in operation. After shearing the head by a flying shear, the strip steel enters the first finishing mill train. All the rolling mills in the first finishing mill train perform rolling operations, and all 8 finishing rolling mills adopt the two-high roll mode. All the rolling mills in the second finishing mill train perform rolling operations to roll out the finished strip steel. In addition, the above-mentioned composite rolling production line is preferably arranged in a section steel workshop, and strip steel finishing equipment is also arranged in the section steel workshop. The rolled finished strip steel passes through a twist guide plate to make the strip steel stand upright. The strip steel in the upright state passes through a feeding roller, a guide groove, and an oscillator and enters a flat conveyor. The strip steel is serpentinely coiled and stands upright on it for air cooling and forward conveying. The strip steel is air-cooled to about 650 °C, manually led, passed through pinch rolls, a hydraulic shear head and tail, and sent to a vertical coiler for tension coiling through a five-roll straightener. After coiling, the coiler barrel shrinks and descends. After manual bundling, the steel coil is pushed onto a fast roller table by a coil uncoiler device, and then transported to a steel coil conveying roller table. Here, the steel coil continues to cool. At the tail of the roller table, the steel coil falling on it is flipped 90° by a coil turning device and pushed onto a steel coil collecting device. After 3-5 coils are collected, the steel coils are packed in large packages and marked, and then lifted to a finished product warehouse by a C-shaped hook and stacked according to requirements. By this method, the thickness range of the strip steel that can be processed and produced can generally be 1.2-5.0 mm, and the width should not be greater than 650 mm.

[0036] The above-mentioned method for co-producing small H-shaped steel and narrow strip steel according to the present invention can not only produce H-shaped steel, I-beam, channel steel, and angle steel, but also produce narrow strip steel varieties. Moreover, since the strip steel finishing equipment occupies less land and is relatively easy to arrange in a section steel workshop, it is beneficial to expand the applicable range of the production line.

[0037] The above are only the preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope defined by the claims.

[0038] Details not described in the present invention are all well-known technologies to those skilled in the art.

Claims

1. A co-linear production method for small H-beams and narrow strip steel, characterized in that, Including: The rolling production line is successively and continuously arranged with a rough rolling mill unit, a first finishing mill unit and a second finishing mill unit; among which, the rough rolling mill unit includes 5 horizontal rolling mills and 2 vertical rolling mills, the first finishing mill unit includes 1 vertical rolling mill and 8 universal / two-high interchangeable finishing rolling mills, and the second finishing mill unit includes 4 four-high housing type horizontal rolling mills; When rolling H-beams and I-beams, the first 3-5 rolling mills of the rough rolling mill unit along the material conveying direction are in rolling operation, the 8 finishing rolling mills of the first finishing mill unit are in rolling operation, and the second finishing mill unit passes through empty; When rolling channel steel and angle steel, the first 3-7 rolling mills of the rough rolling mill unit along the material conveying direction are in rolling operation, at least 6 finishing rolling mills of the first finishing mill unit are in rolling operation, and the second finishing mill unit passes through empty; When rolling strip steel, the first 6-7 rolling mills of the rough rolling mill unit along the material conveying direction are in rolling operation, all the rolling mills of the first finishing mill unit and all the rolling mills of the second finishing mill unit are in rolling operation; All 7 rolling mills of the rough rolling mill unit adopt two-high short stress path rolling mills; the arrangement order of the 5 horizontal rolling mills and 2 vertical rolling mills along the material conveying direction is successively Horizontal Rough Rolling Mill 1 (1), Vertical Rough Rolling Mill 2 (2), Horizontal Rough Rolling Mill 3 (3), Vertical Rough Rolling Mill 4 (4), Horizontal Rough Rolling Mill 5 (5), Horizontal Rough Rolling Mill 6 (6) and Horizontal Rough Rolling Mill 7 (7); The 1 vertical rolling mill of the first finishing mill unit is a two-high short stress path rolling mill, and the remaining 8 finishing rolling mills can all be converted between the two-high mode and the universal mode; the arrangement order of the 1 vertical rolling mill and 8 finishing rolling mills along the material conveying direction is successively Vertical Finishing Rolling Mill 1 (8), Finishing Rolling Mill 2 (9), Finishing Rolling Mill 3 (10), Finishing Rolling Mill 4 (11), Finishing Rolling Mill 5 (12), Finishing Rolling Mill 6 (13), Finishing Rolling Mill 7 (14), Finishing Rolling Mill 8 (15) and Finishing Rolling Mill 9 (16); when rolling H-beams and I-beams, Finishing Rolling Mill 5 (12) and Finishing Rolling Mill 8 (15) of the first finishing mill unit adopt the two-high mode, and the remaining universal / two-high interchangeable finishing rolling mills are all in the universal mode; when rolling channel steel, angle steel and strip steel, all the universal / two-high interchangeable finishing rolling mills of the first finishing mill unit adopt the two-high mode; The 4 rolling mills of the second finishing mill unit are successively Four-High Finishing Rolling Mill 1 (17), Four-High Finishing Rolling Mill 2 (18), Four-High Finishing Rolling Mill 3 (19) and Four-High Finishing Rolling Mill 4 (20) along the material conveying direction; Between the rough rolling mill unit and the first finishing mill unit, and between the first finishing mill unit and the second finishing mill unit, a flying shear is respectively provided for cutting the head or segmenting.

2. The production method according to claim 1, characterized in that: The rolled H-beam specifications include HN100×50 - HN250×125, HM150×100 and HW100×100 - 150×150, the I-beams include 10# - 25#; the channel steel includes 10# - 25#, and the angle steel includes 10# - 16#; the thickness range of the rolled strip steel is 1.2 - 5.0 mm, and the width is not more than 650 mm.

3. The production method according to claim 1, characterized in that: The rolling production line is arranged in the section steel workshop, and strip steel finishing equipment is also arranged in the section steel workshop.

Images