An inlet guide vane configuration, rolling line and rolling process

Abstract

The application discloses an entrance guide groove structure, which comprises a base arranged at the front part, a support arranged at the rear part, a trumpet mouth, a first supporting top plate and a second supporting top plate; the base and the support are arranged along the rolling center line; the trumpet mouth is arranged at the front side top of the base; the first supporting top plate and the second supporting top plate are alternately and spacedly arranged on the base and the support; a plurality of inclined slot holes are arranged on the first supporting top plate along the length direction; the slot holes are in strip shape. A rolling production line machine based on a production line can prevent shearing and head warping. The application designs an entrance guide groove structure and a production line machine production process for preventing heat deformation, improves the heat dissipation function of the entrance guide groove, and reduces the phenomenon of steel stacking caused by the unstable entry of the rolled piece into the double-length shears due to the heat deformation of the entrance guide groove.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of steel rolling production and manufacturing, in particular to an inlet guide groove structure, a rolling production line and a rolling production process. BACKGROUND

[0002] Reinforcing steel bars are a large consumer of steel products, accounting for about 20% of the total steel consumption. In recent years, the apparent consumption of reinforcing steel bars in China is about 250 million tons, which is the main building steel.

[0003] The Wuhan Iron and Steel High-speed Bar Production Line was completed and put into operation in November 2021, with a process flow of feeding, heating, rough rolling, intermediate rolling, pre-finishing rolling, finishing rolling (low-speed channel), finishing and collecting, and warehousing. The finished product specifications are R25-R40mm.

[0004] The double-length shear is one of the important equipment of the high-speed bar production line, and its main function is to cut the finished product according to the preset length. However, due to the large difference in cross-sectional size of the rolled piece (rolled piece diameter of 25-40mm) and the large difference in speed when cutting different specifications (cutting speed of 8.3-20.8m / s), the double-length shear is prone to produce head deflection during cutting, causing rolling line steel stacking accidents. According to statistics, the double-length shear produces 5 times of scrap steel per month, seriously affecting the stability of production.

[0005] The double-length shear cutting head deflection and steel stacking is a common problem faced by domestic high-speed bar production lines. Currently, the measures taken by similar production lines in China generally include increasing the double-length shear lead rate, controlling the gap between the cutting blades, and adjusting the cutting zero limit. However, after taking the above measures on the Wuhan Iron and Steel Bar Production Line, the double-length shear steel stacking accident did not improve. SUMMARY

[0006] The present application aims to improve the problem of double-length shear steel stacking by providing an inlet guide groove structure, a rolling production line and a rolling production process.

[0007] The technical solution adopted by the present application is as follows: an inlet guide groove structure, comprising a base arranged at the front, a support arranged at the rear, a horn mouth, a first support top plate and a second support top plate; the base and the support are arranged along the rolling center line from front to back; the horn mouth is arranged at the front top of the base; the first support top plate and the second support top plate are alternately and spacedly installed on the base and the support; a plurality of inclined slot holes are arranged on the first support top plate along the length direction, and the slot holes are in strip shape.

[0008] According to the above scheme, the length of the slot hole is 150mm±5mm, and the width is 3mm±0.3mm; the two ends of the slot hole along the length direction have a chamfer with a diameter of Φ3mm.

[0009] The application also adopts a rolling production line, which comprises a rough rolling mill group, a first flying shear, a medium rolling mill group, a second flying shear, a pre-precision rolling mill group, a pinch roll, a third flying shear, a precision rolling mill group, the inlet guide groove structure as described above, and a cut-to-length shear arranged in sequence along a rolling center line.

[0010] According to the above scheme, a first water cooling device is arranged between the pre-precision rolling mill group and the pinch roll; and a second water cooling device is arranged between the precision rolling mill group and the rolled piece support structure.

[0011] The application also adopts a rolling production process based on the production line as described above, which can prevent shear head warping, and the process is as follows:

[0012] The rolled piece center line is adjusted to adjust the relative position of the rolled piece and the cut-to-length shear blade when the rolled piece is sheared; then the rolled piece enters the rolling production line through the inlet, is coarsely rolled by the rough rolling mill group, is sheared by the first flying shear, is rolled by the medium rolling mill group, is sheared by the second flying shear, is rolled by the pre-precision rolling mill group, is cooled to the process required temperature, is sent to the third flying shear by the pinch roll, is rolled by the precision rolling mill group, is cooled to the process temperature, is sent to the cut-to-length shear by the inlet guide groove structure, is cut to a fixed size, and is delivered to the subsequent process.

[0013] According to the above scheme, the method for adjusting the rolled piece center line is as follows: according to the size of the rolled product, a sample rod is cut, the center point of the sample rod in the roundness direction is taken, the upper and lower shear blades of the cut-to-length shear are turned to 90° closed position, one end of the sample rod center point is marked close to the closed position of the cut-to-length shear blade, and the sample rod center point is higher than the closed position of the shear blade.

[0014] According to the above scheme, when the diameter of the rolled product is 25 mm, the sample rod center point is 1 mm higher than the closed position of the shear blade; when the diameter of the rolled product is 28 mm, the sample rod center point is 1.5 mm higher than the closed position of the shear blade; when the diameter of the rolled product is 32 mm, the sample rod center point is 2.0 mm higher than the closed position of the shear blade; and when the diameter of the rolled product is 36 mm or 40 mm, the sample rod center point is 3.0 mm higher than the closed position of the shear blade.

[0015] According to the above scheme, before the rolled piece enters the production line, the gap between the blades of the double shear is adjusted according to the finished product size of the rolled piece; the specific method is as follows: according to the finished product size of rolling, the upper and lower blades of the double shear are rotated to the 90° closed position, and the gap between the blades in the vertical direction of the upper and lower blades of the double shear under the non-load condition is adjusted; when the diameter of the finished product is 25mm, the gap between the blades in the vertical direction of the upper and lower blades of the double shear under the non-load condition is 0.2-0.25mm; when the diameter of the finished product is 28mm, the gap between the blades in the vertical direction of the upper and lower blades of the double shear under the non-load condition is 0.25-0.30mm; when the diameter of the finished product is 32mm, the gap between the blades in the vertical direction of the upper and lower blades of the double shear under the non-load condition is 0.30-0.35mm; when the diameter of the finished product is 36mm or 40mm, the gap between the blades in the vertical direction of the upper and lower blades of the double shear under the non-load condition is 0.35-0.40mm.

[0016] According to the above scheme, during the rolling process of the rolled piece, the shearing speed of the double shear is adjusted according to the finished product size of the rolled piece; when the diameter of the finished product is 25mm, the shearing speed of the double shear is adjusted to 19.468-19.547m / s; when the diameter of the finished product is 28mm, the shearing speed of the double shear is adjusted to 19.547-19.625m / s; when the diameter of the finished product is 32mm, the shearing speed of the double shear is adjusted to 15.425-15.487m / s; when the diameter of the finished product is 36mm, the shearing speed of the double shear is adjusted to 12.236-12.285m / s; when the diameter of the finished product is 40mm, the shearing speed of the double shear is adjusted to 9.954-9.993m / s.

[0017] According to the above scheme, during the rolling process of the rolled piece, the elongation of the finished product rack is adjusted according to the finished product size of the rolled piece; when the diameter of the finished product is 25mm, the elongation of the finished product rack is 1.35-1.362; when the diameter of the finished product is 28mm, the elongation of the finished product rack is 1.31-1.32; when the diameter of the finished product is 32mm, the elongation of the finished product rack is 1.345-1.36; when the diameter of the finished product is 36mm, the elongation of the finished product rack is 1.36-1.368; when the diameter of the finished product is 40mm, the elongation of the finished product rack is 1.36-1.39.

[0018] The beneficial effects of the present application are as follows:

[0019] This invention designs an inlet guide trough component and production line to prevent heat deformation, improving the heat dissipation function of the inlet guide trough and reducing the steel accumulation phenomenon caused by unstable entry of the rolled piece into the multiple-length shear due to heat deformation of the inlet guide trough. During the rolling production process, this invention adjusts the centerline of the rolled piece, the shear blade gap of the multiple-length shear for different rolled piece sizes, the shearing speed, and the elongation rate of the finished product stand to achieve stable shearing with the multiple-length shear. This prevents scrap steel from being generated on the rolling channel line due to the head of the rolled piece curling up after shearing, thereby reducing scrap steel and stabilizing production, improving the production rhythm and core competitiveness of the bar production line. This invention can meet the requirements without major modifications to existing production equipment and processes, is easy to operate, and has good results. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the inlet guide groove structure in this invention.

[0021] Figure 2 This is a schematic diagram of a rolling production line according to the present invention. Detailed Implementation

[0022] To better understand the present invention, the invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1 The diagram illustrates an inlet guide groove structure, specifically an inlet guide groove structure designed to prevent heat deformation, used in a rolling production line. The inlet guide groove structure includes a base 4 at the front, a support 5 at the rear, a flared opening 1, a first supporting top plate 3, and a second supporting top plate 7. The base 4 and support 5 are arranged front-to-back along the rolling centerline. The flared opening 1 is located at the top front of the base 4. The first supporting top plate 3 and the second supporting top plate 4 are alternately and sequentially mounted on the base 4 and support 5. The first supporting top plate 3 has multiple inclined slots 2 spaced along its length. The slots 2 are strip-shaped, and both ends of the slots 2 are chamfered.

[0024] In this embodiment, the first supporting top plate 3 and the second supporting top plate 7 are connected to the base 4 or the bracket 5 through the connecting strip 6 on the side.

[0025] In this invention, the length of the slot 2 is 150mm±5mm and the width is 3mm±0.3mm; the two ends of the slot 2 along the length direction have chamfers with a diameter of Φ3mm, the purpose of which is to reduce the stress concentration points of the slot and prevent the slot from cracking.

[0026] In this invention, the rolled piece enters from the flared end 1 and is supported by the first supporting top plate 3 and the second supporting top plate 7.

[0027] like Figure 2A rolling production line is shown, and the reference signs are: 8, rough rolling mill group; 9, first flying shear; 10, intermediate rolling mill group; 11, second flying shear; 12, pre-finishing rolling mill group; 13, first water cooling device; 14, pinch roll; 15, third flying shear; 16, finishing rolling mill group; 17, second water cooling device; 18, entry guide groove structure; 19, double-length shear.

[0028] A rolling production line comprises a rough rolling mill group, a first flying shear, an intermediate rolling mill group, a second flying shear, a pre-finishing rolling mill group, a pinch roll, a third flying shear, a finishing rolling mill group, an entry guide groove structure as described above, and a double-length shear arranged in sequence along a rolling center line.

[0029] In the present application, a first water cooling device is arranged between the pre-finishing rolling mill group and the pinch roll for cooling the rolled piece; specifically, the first water cooling device is 3 groups of water tanks. A second water cooling device is arranged between the finishing rolling mill group and the rolled piece support structure, and the second water cooling device is 2 groups of water tanks.

[0030] In the present application, the rough rolling mill group comprises 6 groups of stands; the intermediate rolling mill group comprises 4 groups of stands; the pre-finishing rolling mill group comprises 2-4 groups of stands; and the finishing rolling mill group comprises 2 groups of stands.

[0031] In the present application, an exit guide groove is arranged after the double-length shear; the above-mentioned devices are all mature devices in the industry, and will not be described here.

[0032] A rolling production process based on the production line described above, which can prevent shear head deflection, the process is as follows:

[0033] Adjust the rolling center line to adjust the relative position of the rolled piece and the double-length shear blade during the shear of the rolled piece; then make the rolled piece enter the rolling production line through the entry of the production line, after being coarsely rolled by the rough rolling mill group, the first flying shear cuts 100-150 mm, then the intermediate rolling mill group is rolled by 4 stands, the second flying shear cuts 200-300 mm, then the pre-finishing rolling mill group is rolled, the rolled piece is cooled to the required temperature by 3 groups of water tanks, the pinch roll is sent to the third flying shear to cut 300-500 mm, then the finishing rolling mill group is rolled, the finished product is cooled to the process temperature by 2 groups of water tanks, and then sent to the double-length shear through the entry guide groove structure to be cut into double-length, and then sent to the subsequent process.

[0034] In the application, before the rolling piece enters the production line, the relative position of the rolling piece and the closing shearing of the double shear shear blade when shearing is adjusted in the rolling piece center line adjustment stage. The specific adjustment method is: according to the size of the finished product of rolling, a sample bar with a length of 1.5m (finished bar) is cut, the center point of the sample bar roundness direction is taken, the upper and lower shear blades of the double shear shear are rotated to 90° closed position, and the end of the sample bar center point close to the double shear shear blade closed position is marked, so that the sample bar center point is higher than the shear blade closed position. Further, when the diameter of the finished product is 25mm, the sample bar center point is 1mm higher than the shear blade closed position; when the diameter of the finished product is 28mm, the sample bar center point is 1.5mm higher than the shear blade closed position; when the diameter of the finished product is 32mm, the sample bar center point is 2.0mm higher than the shear blade closed position; when the diameter of the finished product is 36mm or 40mm, the sample bar center point is 3.0mm higher than the shear blade closed position.

[0035] In the application, before the rolling piece enters the production line, the relative position of the rolling piece and the closing shearing of the double shear shear blade when shearing is adjusted in the rolling piece center line adjustment stage. The specific adjustment method is: according to the size of the finished product of rolling, a sample bar with a length of 1.5m (finished bar) is cut, the center point of the sample bar roundness direction is taken, the upper and lower shear blades of the double shear shear are rotated to 90° closed position, and the end of the sample bar center point close to the double shear shear blade closed position is marked, so that the sample bar center point is higher than the shear blade closed position. Further, when the diameter of the finished product is 25mm, the sample bar center point is 1mm higher than the shear blade closed position; when the diameter of the finished product is 28mm, the sample bar center point is 1.5mm higher than the shear blade closed position; when the diameter of the finished product is 32mm, the sample bar center point is 2.0mm higher than the shear blade closed position; when the diameter of the finished product is 36mm or 40mm, the sample bar center point is 3.0mm higher than the shear blade closed position.

[0036] In the application, during the rolling process of the rolling piece, the shearing speed of the double shear shear is adjusted according to the size of the finished product of the rolling piece. Specifically, when the diameter of the finished product is 25mm, the shearing speed of the double shear shear is adjusted to 19.468~19.547m / s; when the diameter of the finished product is 28mm, the shearing speed of the double shear shear is adjusted to 19.547~19.625m / s; when the diameter of the finished product is 32mm, the shearing speed of the double shear shear is adjusted to 15.425~15.487m / s; when the diameter of the finished product is 36mm, the shearing speed of the double shear shear is adjusted to 12.236~12.285m / s; when the diameter of the finished product is 40mm, the shearing speed of the double shear shear is adjusted to 9.954~9.993m / s.

[0037] In the application, the second rack of the finishing rolling mill is a finished product rack (i.e. the rack close to the side of the double-length shears); during the rolling of the rolled piece, the elongation of the finished product rack (i.e. the second rack of the finishing rolling mill) is adjusted according to the size of the rolled product. Specifically, when the diameter of the rolled product is 25 mm, the elongation of the finished product rack is 1.35-1.362; when the diameter of the rolled product is 28 mm, the elongation of the finished product rack is 1.31-1.32; when the diameter of the rolled product is 32 mm, the elongation of the finished product rack is 1.345-1.36; when the diameter of the rolled product is 36 mm, the elongation of the finished product rack is 1.36-1.368; and when the diameter of the rolled product is 40 mm, the elongation of the finished product rack is 1.36-1.39.

[0038] The main process and mechanism in the application are as follows:

[0039] At present, the top support plate of the existing inlet guide groove is a complete unopened component, which has poor heat dissipation. In the actual production process, the inlet guide groove is warped and deformed under long-term high-temperature environment, and the warping amount of the inlet end and the outlet end of the guide groove is 10 mm. When the rolled piece passes through the inlet guide groove, the rolled piece runs on the warped guide groove, and the "roller coaster" phenomenon of the rolled piece occurs, which causes the instability of the rolled piece in the shearing process. When the rolled piece is lower than the closed position of the shear blade, the shearing warping and steel piling phenomenon easily occurs. The technical solution of the application designs an inlet guide groove structure for preventing the rolled piece from being deformed by heat, and the slot holes arranged on the top plate can improve the heat dissipation function of the inlet guide groove, thereby avoiding the above problems and reducing the instability of the rolled piece caused by the heat deformation of the inlet guide groove and the steel piling phenomenon caused by the instability of the rolled piece entering the double-length shears.

[0040] In the application, the center line of the rolled piece is adjusted, and the relative position of the rolling center line of the rolled piece and the shear blade shearing must be fixed to ensure the consistency of the height of the rolled piece when entering the shearing position, so that the rolled piece can be stably sheared in the double-length shears. If the rolling center line is too low, the rolled piece is easy to be warped and piled when sheared; if the rolling center line is too high, the tail of the rolled piece is easy to be bent after shearing, which is not easy to be aligned on the cooling bed, and affects the shearing efficiency and yield of the finishing sizing. Therefore, the rolling center line of the rolled piece needs to be accurately adjusted.

[0041] In the application, the gap of the shear blade of the low-speed double-length shears under different rolled piece sizes is adjusted to ensure the stability of shearing. If the gap of the shear blade is too large, the sheared surface has a bend; if the gap of the shear blade is too small, the upper and lower shear blades collide under the simulated steel rolling and the like no-load working condition, which easily causes the gap of the shear blade to become larger and the shearing steel to be piled.

[0042] In the application, the shearing speed of the low-speed double-length shears under different rolled piece cross sections is adjusted to ensure the stable shearing of high-speed rolled pieces. The shearing speed is comprehensively affected by the size of the rolled piece cross section, the temperature of the rolled piece when sheared, the strength of the rolled piece in the hot state, and the shearing capacity of the double-length shears equipment, etc. The size cross section span of the production line involved in the application is large (95 mm 2~1359mm 2 The shearing conditions are complex, with a wide strength range (finished product yield strength 400~700 MPa) and significant differences in shearing speed across different cross-sections (9.954 m / s~20.7 m / s). To consistently achieve high shearing quality under these conditions, precise control of the shearing speed across different rolled product cross-sections is necessary. 20.7 m / s is the maximum design speed of the equipment.

[0043] This invention adjusts the elongation rate of the finished product stand to constrain the actual linear velocity of the finished rolled piece, ensuring that the deviation between the shearing speed of the shear blade and the actual linear velocity of the rolled piece tends to a stable value. Because the reference value for the shearing speed of the multiple-length shear blade is the linear velocity of the finished product stand rolls, if the actual elongation rate is too high, the actual velocity of the rolled piece will be too high. When the deviation between the shearing speed of the shear blade and the actual linear velocity of the rolled piece is below a certain amount, shearing stacking accidents are prone to occur during shearing. To achieve stable shearing under a constant shearing speed, it is necessary to control the elongation rate of the finished product stand.

[0044] Implementation Plan 1: From June 3rd to 11th, 2024, 22,361 tons of finished steel of HRB400E, with a finished diameter of R25mm, will be rolled. The main structural and production process adjustments are as follows:

[0045] ① The first support top plate is designed with 4 guide grooves, the length and width of which are 150×3mm. The two ends of the guide groove along the length direction have chamfers with a diameter of Φ3mm.

[0046] ② Adjustment of the center line of the rolled piece: The center point of the template bar is 1mm higher than the closed position of the shear blade.

[0047] ③ Adjust the blade gap of the double-length shears: The blade gap of the double-length shears in the vertical direction under non-load conditions is 0.22mm.

[0048] ④ Adjust the shearing speed of the double-length shears: the shearing speed is 19.522 m / s.

[0049] ⑤ Adjust the elongation rate of the finished machine frame: The elongation rate of the finished machine frame is 1.355.

[0050] Results: No steel stacking issues occurred during the production of R25mm steel.

[0051] Implementation Plan Two: From June 16th to 18th, 2024, 15,603 tons of finished steel of grade HRB400E, 28mm diameter, will be rolled. The main structural and production process adjustments are as follows:

[0052] ① The first support top plate is designed with 4 guide grooves, the length and width of which are 150×3mm. The two ends of the guide groove along the length direction have chamfers with a diameter of Φ3mm.

[0053] ②Adjust the center line of the rolled piece: the center point of the sample bar is 1.5 mm higher than the closed position of the shear blade.

[0054] ③Adjust the gap between the shear blades of the doubling shear: the gap between the upper and lower shear blades of the doubling shear in the vertical direction under non-load conditions is 0.27 mm

[0055] ④Adjust the shearing speed of the doubling shear: the shearing speed is 19.595 m / s

[0056] ⑤Adjust the elongation rate of the finished product rack: the elongation rate of the finished product rack is 1.318.

[0057] Effect: During the production of R28mm specifications, there was no problem of doubling shear shearing pile steel.

[0058] Implementation three: from June 21 to 22, 2024, the finished steel grade is HRB400E, the finished product specification is 32 mm, and 6841 tons are rolled. The main structure and production process adjustment is as follows:

[0059] ①The first support top plate is designed with four guide grooves, the length and width size of the guide groove is 150×3mm, and the two ends of the guide groove along the length direction have a diameter Φ3mm chamfer.

[0060] ②Adjust the center line of the rolled piece: the center point of the sample bar is 2.0 mm higher than the closed position of the shear blade.

[0061] ③Adjust the gap between the shear blades of the doubling shear: the gap between the upper and lower shear blades of the doubling shear in the vertical direction under non-load conditions is 0.32 mm.

[0062] ④Adjust the shearing speed of the doubling shear: the shearing speed is 15.456 m / s.

[0063] ⑤Adjust the elongation rate of the finished product rack: the elongation rate of the finished product rack is 1.352.

[0064] Effect: During the production of R32 specifications, there was no problem of doubling shear shearing pile steel.

[0065] Implementation four: from June 26 to 27, 2024, the finished steel grade is HRB400E, the finished product specification is 36 mm, and 841 tons are rolled. The main structure and production process adjustment is as follows:

[0066] ①The first support top plate is designed with four guide grooves, the length and width size of the guide groove is 150×3mm, and the two ends of the guide groove along the length direction have a diameter Φ3mm chamfer.

[0067] ②Adjust the center line of the rolled piece: the center point of the sample bar is 3.0 mm higher than the closed position of the shear blade.

[0068] ③Adjust the gap between the shear blades of the doubling shear: the gap between the upper and lower shear blades of the doubling shear in the vertical direction under non-load conditions is 0.36 mm

[0069] 4. Adjusting the shearing speed of the doubling shear: the shearing speed was 12.261 m / s.

[0070] 5. Adjusting the elongation of the finished product rack: the elongation of the finished product rack was 1.363.

[0071] Effect: During the production of R36 specifications, there was no problem of shearing pile steel of doubling shear.

[0072] Implementation five: from June 27 to 28, 2024, the finished steel grade is HRB400E, the finished product specification is 40 mm, and 441 tons of rolling. The main structure and production process adjustment is as follows:

[0073] 1. The first support top plate is designed with four guide grooves, the length and width size of the guide groove is 150*3mm, and the guide groove is provided with a chamfer with a diameter of Φ3mm at both ends in the length direction.

[0074] 2. Adjusting the center line of the rolled piece: the center point of the sample rod is 3.0mm higher than the closed position of the shear blade.

[0075] 3. Adjusting the gap between the shear blades of the doubling shear: the gap between the shear blades of the doubling shear in the vertical direction under the non-load condition is 0.39mm.

[0076] 4. Adjusting the shearing speed of the doubling shear: the shearing speed was 9.972 m / s.

[0077] 5. Adjusting the elongation of the finished product rack: the elongation of the finished product rack was 1.375.

[0078] Effect: During the production of R40 specifications, there was no problem of shearing pile steel of doubling shear.

[0079] The above examples are only the best examples, and not the limitation of the embodiments of the present application.

[0080] The above description of the embodiments of the present application in combination with the accompanying drawings is detailed, but the present application is not limited to the described embodiments. For those skilled in the art, various changes, modifications, replacements and variations of these embodiments without departing from the principles and spirits of the present application are still within the protection scope of the present application.

Claims

1. A rolling production process based on a rolling production line to prevent shear head warping, the rolling production line comprising, in sequence along the rolling centerline, a roughing mill, a first flying shear, an intermediate mill, a second flying shear, a pre-finishing mill, pinch rolls, a third flying shear, a finishing mill, an inlet guide groove structure, and a multiple-length shear; Its features are, The process is as follows: Adjust the centerline of the rolled piece to adjust the relative position of the rolled piece and the closed shearing blade of the long-length shear during shearing; then let the rolled piece enter the rolling production line through the entrance of the production line, be roughed by the roughing mill, be rolled by the first flying shear head, then by the intermediate mill, be rolled by the second flying shear head, be rolled by the pre-finishing mill, be cooled to the required temperature, be sent to the third flying shear head by the pinch rolls, be rolled by the finishing mill, be cooled to the process temperature, be sent to the long-length shear for shearing to a fixed length through the entrance guide groove structure, and then be conveyed to the subsequent process; The method for adjusting the center line of the rolled piece is as follows: According to the finished product size, cut a sample bar, take the center point of the sample bar in the roundness direction, rotate the upper and lower blades of the double-length shear to the 90° closed position, and mark the end of the sample bar with the center point close to the closed position of the double-length shear blade, so that the center point of the sample bar is higher than the closed position of the shear blade.

2. The rolling production process as described in claim 1, characterized in that, When the diameter of the rolled product is 25mm, the center point of the sample bar is 1mm higher than the shear blade closing position; when the diameter of the rolled product is 28mm, the center point of the sample bar is 1.5mm higher than the shear blade closing position; when the diameter of the rolled product is 32mm, the center point of the sample bar is 2.0mm higher than the shear blade closing position; when the diameter of the rolled product is 36mm or 40mm, the center point of the sample bar is 3.0mm higher than the shear blade closing position.

3. The rolling production process as described in claim 1, characterized in that, Before the rolled workpiece enters the production line, the shearing gap of the double-length shear is adjusted according to the finished workpiece size. Specifically, the upper and lower shear blades of the double-length shear are rotated to the 90° closed position according to the finished workpiece size. The shearing gap in the vertical direction of the upper and lower shear blades under no-load conditions is adjusted as follows: When the diameter of the rolled workpiece is 25mm, the vertical shearing gap of the upper and lower shear blades under no-load conditions is 0.2~0.25mm; when the diameter of the rolled workpiece is 28mm, the vertical shearing gap is 0.25~0.30mm; when the diameter of the rolled workpiece is 32mm, the vertical shearing gap is 0.30~0.35mm; and when the diameter of the rolled workpiece is 36mm or 40mm, the vertical shearing gap is 0.35~0.40mm.

4. The rolling production process as described in claim 1, characterized in that, During the rolling process, the shearing speed of the multiple-length shear is adjusted according to the finished product size: when the diameter of the rolled product is 25mm, the shearing speed is adjusted to 19.468~19.547m / s; when the diameter of the rolled product is 28mm, the shearing speed is adjusted to 19.547~19.625m / s; when the diameter of the rolled product is 32mm, the shearing speed is adjusted to 15.425~15.487m / s; when the diameter of the rolled product is 36mm, the shearing speed is adjusted to 12.236~12.285m / s; and when the diameter of the rolled product is 40mm, the shearing speed is adjusted to 9.954~9.993m / s.

5. The rolling production process as described in claim 1, characterized in that, During the rolling process, the elongation of the finishing stand is adjusted according to the dimensions of the rolled product: when the diameter of the rolled product is 25mm, the elongation of the finishing stand is 1.35~1.362; when the diameter of the rolled product is 28mm, the elongation of the finishing stand is 1.31~1.32; when the diameter of the rolled product is 32mm, the elongation of the finishing stand is 1.345~1.36; when the diameter of the rolled product is 36mm, the elongation of the finishing stand is 1.36~1.368; and when the diameter of the rolled product is 40mm, the elongation of the finishing stand is 1.36~1.

39.

6. The rolling production process as described in claim 1, characterized in that, The inlet guide channel structure includes a base at the front, a bracket at the rear, a flared opening, a first support top plate, and a second support top plate; the base and the bracket are arranged front and back along the rolling center line; the flared opening is located at the top front side of the base; the first support top plate and the second support top plate are alternately spaced and sequentially installed on the base and the bracket; the first support top plate has a plurality of inclined slots spaced along its length, and the slots are strip-shaped.

7. The rolling production process as described in claim 1, characterized in that, A first water-cooling device is installed between the pre-finishing mill and the pinch rolls; a second water-cooling device is installed between the finishing mill and the workpiece support structure.

8. The rolling production process as described in claim 6, characterized in that, The length of the slot is 150mm±5mm and the width is 3mm±0.3mm; both ends of the slot along the length direction have chamfers with a diameter of Φ3mm.

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