CN113664035A - Production method and system for improving yield of high-speed wire rod production line - Google Patents
Production method and system for improving yield of high-speed wire rod production line Download PDFInfo
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- CN113664035A CN113664035A CN202110984283.8A CN202110984283A CN113664035A CN 113664035 A CN113664035 A CN 113664035A CN 202110984283 A CN202110984283 A CN 202110984283A CN 113664035 A CN113664035 A CN 113664035A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F11/00—Cutting wire
Abstract
A production system for improving the yield of a high-speed wire production line comprises a heating furnace, a roughing mill group, a middle mill group, a pre-finishing mill group, a reducing mill group and a high-speed flying shear, wherein the roughing flying shear is arranged between the roughing mill group and the middle mill group, the middle rolling flying shear is arranged between the middle mill group and the pre-finishing mill group, a pre-finishing cooling box and a pre-finishing flying shear are arranged between the pre-finishing mill group and the finishing mill group, a finishing cooling box is arranged behind the finishing mill group, the reducing mill group is provided with a reducing cooling box, a pinch roll and a wire laying head are arranged behind the high-speed flying shear, an air cooling mechanism is arranged behind the wire laying head, a coil collecting station is arranged behind the air cooling mechanism, a PF line is arranged behind the coil collecting station, and a storehouse is arranged behind the PF line; the invention improves the process from pre-finish rolling to before spinning, increases the yield of high-speed wires and improves the system stability during high-speed wire production.
Description
Technical Field
The invention relates to high-speed wire production, in particular to a production method and a production system for improving the yield of a high-speed wire production line.
Background
High-speed wire rods are one of important products in the steel industry, and the products are various, comprise bearing steel, spring steel, cord steel, cold heading steel, building steel and the like, and are widely applied to the industries of automobiles, machinery, metal products, buildings and the like. In recent years, the yield is continuously increased, the yield in 2019 reaches 15682 ten thousand tons, and the yield is increased by 8.9 percent compared with the yield in 2018 and accounts for 15.74 percent of the yield of crude steel in China.
A typical high speed wire rod rolling mill train essentially comprises: at present, the highest rolling speed of a common domestic high-speed wire production line is about 80m/s, the number of frames of the roughing mill set, the intermediate rolling mill set, the pre-finishing mill set and the finishing mill set of the high-speed wire production line is respectively 6 frames +10 frames, and the total number is 28 frames.
In the existing production method, because of the limitation of parameters of a rolling mill and a motor of a pre-finishing mill group, the phenomenon of excess motor power is easy to occur after the speed is increased, the rolling faults are increased, and the improvement range of the rolling line speed and the yield is limited:
limited by the motor parameters and the process design of the centralized transmission type finishing mill group, the improvement range of the rolling speed and the yield is limited;
the hole type system is complicated after the reducing sizing mill set or the reducing mill set is configured, so that the production cost is increased;
after the sizing mill set is reduced, the corresponding rolling passes of the finishing mill set are reduced, particularly large sizes are reduced, and steel piling accidents are easy to occur when the finishing mill set only rolls for 2 passes;
the reducing sizing mill unit adopts low-temperature high-pressure rolling, but the head of a rolled piece cannot realize low-temperature rolling, the performance of the head is lower than that of the middle part, manual shearing is needed in subsequent processes, a large amount of manpower is wasted, the labor environment is poor, and the operation intensity is high;
at the head and the tail of 1 steel rolling, the head and the tail of a rolled piece are out of tolerance and the product rodding performance is poor due to the fact that tension between units is not established.
Aiming at the problems in the current high-speed wire rod production, the invention provides a production system for improving the yield and the product quality of a high-speed wire rod production line, which can greatly improve the yield of the high-speed wire rod production line, the mechanical property, the dimensional precision and the stability of the performance of a wire rod product, improve the utilization rate of a production line rolling mill, improve the operation rate and improve the economic benefit.
Disclosure of Invention
In order to solve the above problems, the present invention provides a production system for increasing the yield of a high-speed wire production line.
In order to solve the problems, the invention is realized by the following scheme:
the production system for improving the yield of a high-speed wire production line comprises a heating furnace, a roughing mill group, an intermediate mill group, a pre-finishing mill group, a reducing mill group and a high-speed flying shear, wherein the roughing flying shear is arranged between the roughing mill group and the intermediate mill group, the intermediate mill group and the pre-finishing mill group are provided with the intermediate rolling flying shear, a pre-finishing cooling box and a pre-finishing cooling flying shear are arranged between the pre-finishing mill group and the finishing mill group, a finishing cooling box is arranged behind the finishing mill group, the reducing cooling box is arranged behind the reducing mill group, a pinch roll and a wire laying head are arranged behind the high-speed flying shear, an air cooling mechanism is arranged behind the wire laying head, a coil collecting station is arranged behind the air cooling mechanism, a PF line is arranged behind the coil collecting station, and a warehouse is arranged behind the PF line.
Further, the roughing mill group has 6 frames, the intermediate mill group has 6 frames, the pre-finishing mill group has 6 frames, the finishing mill group has 10 frames, and the reducing mill group has 4 reducing sizing mill frames or 2 reducing mill frames.
Furthermore, guides and guards are arranged at the front and the rear of each frame of the rough rolling unit, the middle rolling unit, the finishing rolling unit and the reducing unit.
Furthermore, a loop is arranged between six frames of the pre-finishing mill group, and a guide is arranged between each frame.
A production method for improving the yield of a high-speed wire rod production line comprises the following steps:
s1: heating by a heating furnace: heating the steel billet by using a heating furnace;
s2: rolling by a roughing mill set: rolling the slab heated in step S1 for 6 passes using a roughing train;
s3: rough rolling flying shears and a middle rolling mill set are used for rolling: cutting the wire rod rolled in the step S2 by using a rough rolling flying shear, and performing 6-pass rolling on the cut wire rod by using a middle rolling mill set;
s4, rolling by a medium rolling flying shear and a pre-finishing mill set: and (4) using a medium rolling flying shear to shear the head and the tail of the wire rod rolled in the step S3, performing 2-pass, 4-pass or 6-pass rolling on the wire rod by a pre-finishing mill group after shearing the head and the tail, and performing 2-pass or 4-pass machining on a rack in the middle of the pre-finishing mill group to be free.
S5: pre-finish rolling and then cooling: and (4) cooling the wire rod subjected to the pre-finish rolling in the step S4 through a pre-finish rolling cooling box.
S6: pre-finish rolling flying shears and finish rolling by a finish rolling unit: and (4) performing head-tail shearing on the wire rod subjected to cooling in the step (S5) by using a pre-finish rolling flying shear, and performing hole-type rolling on the wire rod subjected to head-tail shearing by using a finishing mill group.
S7: and (3) cooling treatment after finish rolling: and (4) cooling the wire rod subjected to the finish rolling in the step S6 through a finish rolling cooling box.
S8: rolling by a reducing mill set: the wire rod cooled in the step S7 is subjected to pass rolling in 2 or 4 passes by using a reducing mill,
s9: cooling after rolling by a reducing mill set: and (4) cooling the wire rod subjected to reducing rolling in the step (S8) through a reducing cooling box.
S10: cutting the head and the tail by high-speed flying shear: and cutting the wire rod with the temperature reduced in the step S9 at the position with unqualified wire rod head and tail sizes by a high-speed flying shear.
S11: spinning and looping: the wire rod cut in step S10 is nipped by the pinch rolls and fed to the laying head to be laid in a loop shape.
S12: controlling cooling by an air cooling line: and (4) performing controlled cooling on the wire rod coil passing through the wire laying machine in the step (S11) by using an air cooling mechanism.
S13: collecting the collection rolls: and (4) collecting the wire rod coil cooled and cooled in the step (S12) through a coil collecting station, cooling by a PF wire, bundling, weighing, labeling, coil unloading and storing in a warehouse.
Further, in the step S1, the billet is heated to 950 to 1250 ℃ using a walking beam furnace, and the size of the heated billet is 150mm × 150mm to 170mm × 170 mm.
Further, in the step S2, the deformation compression ratio of each pass is controlled to be 1.22-1.43 in the rough rolling process, the deformation temperature is 880-1030 ℃, and the running speed of a rolled piece in the rolling process of the rough rolling unit is 0.08-2.00 m/S; in the step S3, the deformation compression ratio of each pass is controlled to be 1.22-1.38, the deformation temperature is 880-1000 ℃, and the running speed of the rolled piece is 0.8-10.00 m/S; in the step S4 pre-finish rolling process, the deformation compression ratio of each pass is controlled to be 1.20-1.35, the deformation temperature is 860-980 ℃, and the running speed of a rolled piece is 2.0-25.00 m/S; the deformation compression ratio of each pass is controlled to be 1.20-1.28 in the step S6 finish rolling process, the deformation temperature is 800-950 ℃, the running speed of a rolled piece is 9.0-95.00 m/S, the deformation compression ratio of each pass is controlled to be 1.20-1.30 in the step S8 reducing rolling process, the deformation temperature is 720-900 ℃, and the running speed of the rolled piece is 8.0-120.00 m/S.
Further, in the step S4, the pre-finishing mill group rolls, and two stands in the middle of the pre-finishing mill group pass through the pre-finishing mill group, so that the stability of the whole-line production is maintained.
Further, the temperature reduction capacity of a single water tank of the pre-finish rolling cooling box subjected to the temperature reduction treatment after the pre-finish rolling in the step S5 is 30-200 ℃, the temperature recovery between the water tanks is realized through an air cooling section, and the temperature reduction range of the rolled piece after the pre-finish rolling and the cooling is controlled to be 100-200 ℃; the cooling capacity of a single water tank of the finish rolling cooling box subjected to cooling treatment after finish rolling in the step S7 is 30-180 ℃, temperature recovery is realized between the water tanks through an air cooling section, and the temperature reduction amplitude of a rolled piece after cooling is controlled to be 100-250 ℃ after finish rolling; when the reducing and cooling box for cooling treatment after reducing rolling in the step S9 is cooled, the head of the rolled piece is ensured to start opening a first water tank water valve after passing through a first water tank, the cooling capacity of the single water tank is 30-150 ℃, and the temperature reduction range of the rolled piece after cooling is controlled to be 30-200 ℃ after passing through a reducing and sizing unit.
Further, the spinning temperature of the spinning machine in the step S11 is 700-900 ℃; and the coiling temperature of the wire rod after the air cooling mechanism in the step S12 is cooled is 350-600 ℃.
The invention has the following beneficial effects:
(1) the pre-finishing mill group flail frame controls rolling, reduces the motor load of the pre-finishing mill group, and improves the running stability during high-speed rolling;
(2) the pre-finishing mill group realizes non-tension rolling through a loop, and after the pre-finishing mill group throws a rack, the distance between the mills is large, stable loop control can be realized, and the head and tail sizes of rolled pieces are not out of tolerance;
(3) the finishing mill set controls rolling, micro-tension rolling is realized through pass parameters, and electrical control is simple, stable and reliable;
(4) the finishing mill group controls rolling, when the rolling pass is 2, the roll diameter is the same, the rolled piece runs stably, the steel biting accident is not easy to occur, and the productivity and the operating rate are improved;
(5) all the finished product outlet frames are reducing sizing machine sets or reducing machine sets, the full-line hole type system is simple, the quantity of matched rolls is small, and the production is simplified;
(6) the production line realizes the full-line temperature control, and the product quality is high;
(7) the high-speed flying shears are arranged behind the reducing and sizing unit, so that the part with the size and specification of the head and the tail of the rolled piece which are out of tolerance can be sheared, the subsequent links of manually shearing the head and the tail are saved, and the manual labor load of a production line is reduced;
(8) negative deviation rolling of the deformed steel bar can be realized, and the metal yield is improved;
(9) the production specification range is wide, and all products in the specification range of phi 6.0mm to phi 90.0mm can be produced;
(10) the yield of a high-speed wire production line is greatly improved by 20-30 percent compared with the yield of a common high-speed wire production line of a typical 10-frame finishing mill group;
(11) the mechanical property, the dimensional accuracy and the performance stability of the wire rod product of the high-speed wire rod product are improved, and the dimensional accuracy of the round steel can reach +/-0.05 mm;
(12) the utilization rate of a production line rolling mill can be improved, the operation rate is improved, and the economic benefit is improved.
Drawings
The invention is further illustrated by the figures and the detailed description.
FIG. 1 is a schematic view of a production system of the present invention
FIG. 2 is a production hole pattern diagram of the present invention
FIG. 3 is a metallographic structure diagram of a high alloy produced by the present invention
FIG. 4 is a metallographic structure diagram of a low alloy produced by the present invention
In the figure: 1-heating furnace, 2-rough rolling unit, 3-rough rolling flying shear, 4-intermediate rolling unit, 5-intermediate rolling flying shear, 6-pre-finishing rolling unit, 7-pre-finishing rolling cooling box, 8-pre-finishing rolling flying shear, 9-finishing rolling unit, 10-finishing rolling cooling box, 11-reducing unit, 12-reducing cooling box, 13-high speed flying shear, 14-pinch roll, 15-spinning machine, 16-air cooling mechanism, 17-reeling station and 18-warehouse.
Detailed Description
A production method and system for improving the yield of a high-speed wire rod production line as shown in FIG. 1 comprises a heating furnace 1 for heating a steel billet, a rough rolling mill group 2 for primarily rolling the heated steel billet, a rough rolling post-flying shear 3 for head shearing the roughly rolled wire rod, an intermediate rolling mill group 4 for secondarily rolling the roughly rolled wire rod, an intermediate rolling flying shear 5 for tail shearing the intermediate rolled wire rod, a pre-finishing mill group 6 for three times rolling the intermediate rolled wire rod, a pre-finishing cooling box 7 for cooling the pre-finished wire rod, a pre-finishing flying shear 8 for head and tail shearing the cooled pre-finished wire rod, a finishing mill group 9 for secondarily finely rolling the pre-finished wire rod after cooling by flying shear, a cooling box 10 for cooling the finish rolled wire rod, a reducing mill group 11 for diameter-reducing the cooled finish rolled wire rod, a reducing unit 11, a reducing mill group for diameter-reducing the diameter of the finish rolled wire rod, a wire rod reducing unit for reducing the diameter of the wire rod, a wire rod reducing the diameter of the wire rod, and a wire rod reducing the diameter of the wire rod reducing the diameter of the wire rod, The high-speed wire rod coiling machine comprises a reducing and cooling box 12 for cooling the reduced wire rod and a high-speed flying shear 13 for shearing the reduced and cooled wire rod at the head-tail unqualified size part, the wire rod with the qualified size after flying shear enters a wire laying machine 15 for laying wire and coiling after being clamped by a pinch roll 14, the coiled wire rod coil is cooled through an air cooling mechanism 16, the cooled wire rod coil is coiled through a coil collecting station 17, the coiled wire rod is cooled, bundled, weighed, labeled and uncoiled through a PF wire and then stored in a warehouse 18, a roughing mill unit 2 comprises six frames, a middle mill unit 4 comprises six frames, a pre-finishing mill unit 6 comprises six frames, a finishing mill unit 9 comprises ten frames, and the reducing mill unit 11 comprises four reducing and sizing mill frames or two reducing frames.
The invention produces the high-speed wire rod step as follows:
taking round steel as an example
(1) Heating by a heating furnace: a walking beam type heating furnace is adopted to heat the billet with the cross section size of 150mm multiplied by 150mm to 170mm multiplied by 170mm to 950 ℃ to 1250 ℃.
(2) Rough rolling by a rough rolling mill set: and (2) rolling the square billet heated in the step (1) by adopting a horizontal-vertical alternative or flat-roll rolling mode through a 6-pass short-stress-line rough rolling unit 2, wherein in the rolling process, hole-free rolling and hole-pass rolling can be adopted, when the hole-pass rolling is adopted, the hole-pass sequence of the rough rolling unit formed by 6 rough rolling mills is a box-type-deformed ellipse-circle hole-pass system, when the hole-pass rolling is adopted, guides are arranged at the front and the rear of each rough rolling mill, a rough rolling flying shear machine is arranged behind the rough rolling unit to perform flying shear heading on the roughly rolled wire, the deformation compression ratio of each pass is controlled to be 1.22-1.43 in the rough rolling process, the deformation temperature is 880-1030 ℃, and the running speed of the rolled piece in the rolling process of the rough rolling unit is 0.08-2.00 m/s.
(3) Cutting the head of the flying shear and rolling by a middle rolling mill set: and (3) performing head shearing of a rough rolling flying shear on the rolled piece wire rod rolled by the rough rolling mill set in the step (2), performing 6-pass or 8-pass short stress line intermediate rolling mill set rolling on the rolled piece wire rod subjected to head shearing by the flying shear, wherein pass processing is adopted during rolling, a pass system is an oval-round pass system, guides and guards are arranged at the front and the rear of each intermediate rolling mill, the deformation compression ratio of each pass is controlled to be 1.22-1.38 in the rolling process, the deformation temperature is 880-1000 ℃, and the running speed of the rolled piece is 0.8-10.00 m/s.
(4) Cutting the head and the tail of a medium rolling flying shear and rolling by a pre-finishing mill set: cutting the head and the tail of the rolled piece wire rod which is rolled in the step (3), rolling the rolled piece wire rod which is cut with the head and the tail by a pre-finishing mill group for 2 passes, 4 passes or 6 passes, when rolling a small-specification product, for example, phi 6.0mm and phi 8.0mm, adopting 6 passes for rolling, wherein the front 2 frames are short stress rolling mills, the rear 4 frames are flat cantilever rolling mills, when rolling a large-specification product, for example, phi 10.0mm and phi 12.0mm, adopting 4 passes for rolling, wherein two pre-finishing rolling mills in the middle of the pre-finishing mill group are empty, the empty pre-finishing rolling mill is an empty rack, when rolling by the pre-finishing mill group, the hole pattern system is an oval-round hole pattern system, guides are arranged at the front and the rear of each pre-finishing rolling mill, a loop is arranged between the racks, controlling the tension by the loop to realize the tension-free rolling, the deformation compression ratio of each pass is controlled between 1.20 and 1.35 in the rolling process, and the deformation temperature is between 860 ℃ and 980 ℃, the running speed of the rolled piece is 2.0-25.00 m/s, two parts of the pre-finishing mill set are overhead, and the problem of insufficient capacity of pre-finishing mill equipment after the production line is accelerated is solved.
(5) Cooling the wire rod after the pre-finishing mill group: and (3) cooling the rolled piece wire subjected to pre-finish rolling in the step (4), wherein the cooling capacity of a single water tank is 30-200 ℃ during cooling, temperature recovery is realized between the water tanks through an air cooling section, the temperature reduction range of the rolled piece after cooling is 100-200 ℃, the wire subjected to pre-finish rolling is reduced by 100-200 ℃ in advance, cooling control and rolling control can be better carried out, and the temperature of the rolled piece wire subjected to cooling is 900-950 ℃.
(6) Pre-finish rolling flying shear head and tail cutting and rolling by a finishing mill set: and (3) performing flying shear head and tail cutting operation after the pre-finishing mill group on the rolled piece wire subjected to wire cooling treatment after the pre-finishing mill group in the step (5), performing finishing mill group rolling on the wire subjected to head and tail cutting, wherein the finishing mill group adopts a centralized transmission mode, the tension between the racks of the finishing mill group is adjusted through a pass system, the number of rolling racks of the finishing mill group is 2-8, the pass system is an oval-round pass system during rolling, guides are arranged at the front and the rear of each mill, the deformation compression ratio of each pass is controlled to be 1.20-1.28 in the rolling process, the deformation temperature is 800-950 ℃, and the operation speed of the rolled piece is 9.0-95.00 m/s.
(7) Post cooling treatment of a finishing mill group: and (3) cooling the rolled piece rolled by the finishing mill group in the step (6), wherein the cooling capacity of a single water tank is 30-180 ℃ during cooling, the temperature recovery is realized between the water tanks through an air cooling section, the cooling amplitude of the rolled piece is 100-250 ℃ after cooling, and the temperature of a wire of the rolled piece after cooling is 850-900 ℃ and 900-950 ℃.
(8) Rolling by a reducing sizing mill set: and (3) rolling the rolled piece subjected to cooling treatment in the step (7) by a 4-pass reducing sizing mill set, wherein the pass system is an oval-round-oval-round pass system during rolling, guides are arranged at the front and the rear of each rolling mill, the guides in front of the last rolling mill and the last 3 rolling mill are rolling guides, the rest guides are sliding guides, the deformation compression ratio of each pass is controlled to be 1.20-1.30, the deformation temperature is 720-900 ℃, and the running speed of the rolled piece is 8.0-120.00 m/s during rolling.
(9) Cooling the reducing sizing mill unit: and (3) carrying out post-rolling cooling treatment on the round steel rolled by the reducing and sizing mill set for 4 passes in the step (8), starting to open a water valve of a first water tank after the head of the rolled piece passes through the first water tank after the reducing and sizing mill set during cooling, wherein the cooling capacity of the single water tank in the cooling tank is 30-150 ℃, the cooling amplitude of the rolled piece after cooling treatment is 30-200 ℃, and the temperature of the rolled piece wire is 700-900 ℃.
(10) Cutting the head and the tail by high-speed flying shear: and (4) shearing the part of the round steel wire rod subjected to the cooling treatment in the step (9) and having unqualified head and tail dimension specifications, wherein the overshoot coefficient of the running speed of the high-speed flying shear is 0.1-10% compared with that of the rolled piece.
(11) Spinning and looping: and (3) clamping the qualified rolled piece subjected to the high-speed flying shear head and tail cutting in the step (10) by a front pinch roll of a laying head, feeding the clamped rolled piece into the laying head for laying wire and looping, wherein the laying temperature of the laying head is 700-900 ℃.
(12) Controlling cooling by an air cooling line: and (3) controlling and cooling the wire rod coil subjected to wire laying and looping by the wire laying machine in the step (11) in an air cooling line, wherein according to the continuous cooling transformation rule of the round steel, the cooling mode can adopt quick cooling, air cooling or delayed cooling to ensure that the final tissue is qualified, and the temperature of the round steel coil is 350-600 ℃ after the round steel is cooled by the air cooling line.
(13) Collecting the collection rolls: and (4) collecting the wire rod coils cooled by the air cooling line in the step (12) by a coil collecting station, cooling by a PF line, bundling, weighing, labeling, coil unloading and warehousing.
Second, take deformed steel bar as an example
(1) Heating by a heating furnace: a walking beam type heating furnace is adopted to heat the billet with the cross section size of 150mm multiplied by 150mm to 170mm multiplied by 170mm to 950 ℃ to 1050 ℃.
(2) Rough rolling by a rough rolling mill set: and (2) carrying out 6-pass short-stress-line rough rolling unit rolling on the square billet heated in the step (1) by adopting a horizontal-vertical alternative or flat-roller rolling mode, wherein in the rolling process, hole-free rolling and hole-pattern rolling can be adopted, when the hole-pattern rolling is adopted, a hole pattern system with the hole pattern sequence of a rough rolling unit formed by 6 rough rolling mills is box-type-deformed ellipse-circle is adopted, guides are arranged at the front and the back of each rough rolling mill in the hole-pattern rolling process, a rough rolling flying shear machine is arranged behind the rough rolling unit to carry out flying shear heading on the roughly rolled wire rod, the deformation compression ratio of each pass is controlled to be 1.22-1.43 in the rough rolling process, the deformation temperature is 880-1030 ℃, and the running speed of the rolled piece in the rolling process of the rough rolling unit is 0.08-2.00 m/s.
(3) Cutting the head of the flying shear and rolling by a middle rolling mill set: and (3) performing head shearing of a rough rolling flying shear on the rolled piece wire rod rolled by the rough rolling mill set in the step (2), performing 6-pass or 8-pass short stress line intermediate rolling mill set rolling on the rolled piece wire rod subjected to head shearing by the flying shear, wherein pass processing is adopted during rolling, a pass system is an oval-round pass system, guides and guards are arranged at the front and the rear of each intermediate rolling mill, the deformation compression ratio of each pass is controlled to be 1.22-1.38 in the rolling process, the deformation temperature is 880-1000 ℃, and the running speed of the rolled piece is 0.8-10.00 m/s.
(4) Cutting the head and the tail of a medium rolling flying shear and rolling by a pre-finishing mill set: cutting the head and the tail of the rolled piece wire rod which is rolled in the step (3), rolling the rolled piece wire rod which is cut with the head and the tail by a pre-finishing mill group for 2 passes, 4 passes or 6 passes, when rolling a small-specification product, for example, phi 6.0mm and phi 8.0mm, adopting 6 passes, when rolling a larger-specification product, for example, phi 10.0mm and phi 12.0mm, adopting 4 passes, wherein two pre-finishing mills in the middle of the pre-finishing mill group are passed through, the passed pre-finishing mill is a passed through rack, the pass system is an oval-round pass system when the pre-finishing mill group rolls, guides and guards are arranged at the front and the back of each pre-finishing mill, a loop is arranged between the racks, tension is controlled by the loop to realize tension-free rolling, the deformation compression ratio of each pass is controlled between 1.20 and 1.35 during the rolling process, the deformation temperature is controlled between 860 ℃ and 980 ℃, the operation speed of the rolled piece is 2.0 m/s-25.00 m/s, two parts of the pre-finishing mill set are overhead so as to solve the problem of insufficient capacity of pre-finishing mill equipment after the production line is accelerated.
(5) Cooling the wire rod after the pre-finishing mill group: and (3) cooling the rolled piece wire subjected to pre-finish rolling in the step (4), wherein the cooling capacity of a single water tank is 30-200 ℃ during cooling, temperature recovery is realized between the water tanks through an air cooling section, the temperature reduction range of the rolled piece after cooling is 100-200 ℃, the wire subjected to pre-finish rolling is reduced by 100-200 ℃ in advance, cooling control and rolling control can be better carried out, and the temperature of the rolled piece wire subjected to cooling is 900-950 ℃.
(6) Pre-finish rolling flying shear head and tail cutting and rolling by a finishing mill set: and (3) performing flying shear head and tail cutting operation after the pre-finishing mill group on the rolled piece wire subjected to wire cooling treatment after the pre-finishing mill group in the step (5), performing finishing mill group rolling on the wire subjected to head and tail cutting, wherein the finishing mill group adopts a centralized transmission mode, the tension between the racks of the finishing mill group is adjusted through a pass system, the number of rolling racks of the finishing mill group is 2-8, the pass system is an oval-round pass system during rolling, guides are arranged at the front and the rear of each mill, the deformation compression ratio of each pass is controlled to be 1.20-1.28 in the rolling process, the deformation temperature is 800-950 ℃, and the operation speed of the rolled piece is 9.0-95.00 m/s.
(7) Post cooling treatment of a finishing mill group: and (3) cooling the rolled piece rolled by the finishing mill group in the step (6), wherein the cooling capacity of a single water tank is 30-180 ℃ during cooling, temperature recovery is realized between the water tanks through an air cooling section, the temperature reduction range of the rolled piece after cooling is 100-250 ℃, and the temperature of a wire of the rolled piece after cooling is 850-900 ℃.
(8) Rolling by a reducing mill set: and (3) rolling the rolled piece subjected to cooling treatment in the step (7) by a 2-pass reducing sizing mill set, wherein the pass system is an oval-round pass system during rolling, guides and guards are arranged at the front and the rear of each rolling mill, the guide and guard before the last rolling mill is a rolling guide and guard, the rest guides and guards are sliding guides and guards, the deformation compression ratio of each pass is controlled to be 1.20-1.30, the deformation temperature is 720-900 ℃, and the running speed of the rolled piece is 27-115.00 m/s in the rolling process.
(9) Post cooling treatment of the reducing unit: and (3) performing post-rolling cooling treatment on the deformed steel bar which is subjected to 2-pass rolling by the reducing unit in the step (8), starting to open a water valve of a first water tank after the head of the rolled piece passes through the first water tank after the reducing and sizing unit during cooling, wherein the cooling capacity of the single water tank in the cooling tank is 30-150 ℃, the surface temperature of the rolled piece after cooling is not lower than () temperature and higher than 400 ℃ so as to prevent low-temperature martensite structures from appearing, the temperature reduction amplitude of the rolled piece after cooling is 30-200 ℃, and the temperature of a wire of the rolled piece after cooling is 700-900 ℃.
(10) Cutting the head and the tail by high-speed flying shear: and (4) shearing the part of the deformed steel wire subjected to the temperature reduction treatment in the step (9) and having unqualified head and tail dimensions, wherein the overshoot coefficient of the running speed of the high-speed flying shear is 0.1-10% compared with that of the rolled piece.
(11) Spinning and looping: and (3) clamping the qualified rolled piece subjected to the high-speed flying shear head and tail cutting in the step (10) by a front pinch roll of a laying head, feeding the clamped rolled piece into the laying head for laying wire and looping, wherein the laying temperature of the laying head is 700-900 ℃.
(12) Controlling cooling by an air cooling line: and (3) performing controlled cooling on the wire rod coil subjected to wire laying and looping by the wire laying machine in the step (11) by entering an air cooling line, wherein the first sections of cooling sections adopt a rapid cooling mode according to the continuous cooling transformation rule of the deformed steel bar so as to ensure that the final structure is fine ferrite and pearlite, and ensure that a low-temperature structure, such as a martensite structure, does not appear during cooling, and the temperature of the deformed steel bar coil is 400-550 ℃ after the deformed steel bar is cooled by the air cooling line.
(13) Collecting the collection rolls: and (4) collecting the wire rod coils cooled by the air cooling line in the step (12) by a coil collecting station, cooling by a PF line, bundling, weighing, labeling, coil unloading and warehousing.
The technological parameters of the invention for producing deformed steel bar are as follows:
the mechanical properties of the thread after being processed by the production method are as follows:
| numbering | Specification (phi, mm) | Yield strength (MPa) | Tensile strength (MPa) | Elongation (%) | Agt(%) |
| 1 | 6.0 | 470 | 665 | 25.0 | 13.0 |
| 2 | 6.0 | 470 | 670 | 24.5 | 12.8 |
| 3 | 6.0 | 475 | 665 | 25.0 | 12.0 |
| 4 | 6.0 | 470 | 658 | 25.5 | 11.9 |
| 5 | 8.0 | 455 | 650 | 25.5 | 11.9 |
| 6 | 8.0 | 450 | 645 | 23.5 | 12.5 |
| 7 | 8.0 | 455 | 640 | 22.0 | 12.7 |
| 8 | 8.0 | 450 | 645 | 23.5 | 12.0 |
| 9 | 10.0 | 435 | 630 | 24.0 | 13.0 |
| 10 | 10.0 | 440 | 635 | 21.5 | 12.9 |
| 11 | 10.0 | 435 | 635 | 26.0 | 11.4 |
| 12 | 10.0 | 435 | 630 | 23.0 | 12.3 |
The metallographic structure of the wire rod produced by the method of the invention is shown in fig. 3 and 4, wherein fig. 3 shows that the metallographic structure of the high-alloy wood mainly contains tempered martensite, and fig. 4 shows that the metallographic structure of the low-alloy wood mainly contains ferrite and austenite as pearlite.
Compared with the common high-speed wire production line, the high-speed wire production system reduces the motor load of the pre-finishing mill set and improves the running stability during high-speed rolling; the head and tail sizes of rolled pieces are not out of tolerance; the electrical control of the finishing mill group is simple, stable and reliable, the rolled piece runs stably, the steel biting accident is not easy to occur, and the production rate and the operation rate are improved; all the finished product outlet frames are reducing sizing machine sets or reducing machine sets, the full-line hole type system is simple, the quantity of matched rolls is small, and the production is simplified; subsequent links of manually shearing the head and the tail are saved, and the manual labor load of a production line is reduced; negative deviation rolling of the deformed steel bar can be realized, and the metal yield is improved; the mechanical property, the dimensional accuracy and the performance stability of the high-speed wire rod product are improved, the utilization rate of a production line rolling mill can be improved, the operation rate is improved, and the economic benefit is improved.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top", "end", "side", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Also, unless expressly stated or limited otherwise, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, and thus, for example, "connected" may be fixedly, detachably, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
It is to be understood that the above description is only one embodiment of the invention, and not all embodiments. Other modifications and equivalents of the embodiments of the invention will be apparent to those skilled in the art based on the examples and embodiments of the invention, and are intended to be included within the scope of the claims of the present invention without departing from the spirit and scope of the embodiments.
Claims (10)
1. The utility model provides an improve production system of high-speed wire rod production line output which characterized in that: comprises a heating furnace (1), a roughing mill group (2), a middle mill group (4), a pre-finishing mill group (6), a finishing mill group (9), a reducing mill group (11) and a high-speed flying shear (13), wherein the roughing flying shear (3) is arranged between the roughing mill group (2) and the middle mill group (4), the middle rolling flying shear (5) is arranged between the middle mill group (4) and the pre-finishing mill group (6), a pre-finishing cooling box (7) and a pre-finishing flying shear (8) are arranged between the pre-finishing mill group (6) and the finishing mill group (9), a finishing cooling box (10) is arranged behind the finishing mill group (9), the reducing cooling box (12) is arranged behind the reducing mill group (11), a high-speed flying shear (13) is provided behind a pinch roll (14) and a wire laying head (15), an air cooling mechanism (16) is arranged behind the wire laying head (15), and a wire collecting and coiling station (17) is arranged behind the air cooling mechanism (16), a PF line is arranged behind the coil collecting station (17), and a storehouse (18) is arranged behind the PF line.
2. The production system for increasing the yield of a high-speed wire production line according to claim 1, wherein: the roughing mill group (2) is provided with 6 frames, the intermediate mill group (4) is provided with 6 frames, the pre-finishing mill group (6) is provided with 6 frames, the finishing mill group (9) is provided with 10 frames, and the reducing mill group (11) is provided with 4 reducing sizing mill frames or 2 reducing mill frames.
3. The production system for increasing the yield of a high-speed wire production line according to claim 2, wherein: and guides and guards are arranged at the front and the back of each frame of the rough rolling unit (2), the middle rolling unit (4), the finishing rolling unit (9) and the reducing unit (11).
4. The production system for increasing the yield of a high-speed wire production line according to claim 2, wherein: a loop is arranged between six frames of the pre-finishing mill group (6), and a guide is arranged between each frame.
5. The production method for improving the yield of the high-speed wire rod production line comprises the production system for improving the yield of the high-speed wire rod production line, which is characterized in that:
s1: heating by a heating furnace: heating the billet by using a heating furnace (1);
s2: rolling by a roughing mill set: rolling the slab heated in step S1 for 6 passes using the roughing mill group (2);
s3: rough rolling flying shears and a middle rolling mill set are used for rolling: cutting the wire rod rolled in the step S2 by using a rough rolling flying shear (3), and performing 6-pass rolling on the cut wire rod by using a middle rolling mill set (4);
s4, rolling by a medium rolling flying shear and a pre-finishing mill set: using a medium rolling flying shear (5) to shear the head and the tail of the wire rod rolled in the step S3, after the head and the tail are sheared, performing 2-pass, 4-pass or 6-pass rolling on the wire rod by a pre-finishing mill group (6), and performing 2-pass or 4-pass machining to ensure that a rack in the middle of the pre-finishing mill group (6) is empty;
s5: pre-finish rolling and then cooling: cooling the wire rod subjected to the pre-finish rolling in the step S4 through a pre-finish rolling cooling box (7);
s6: pre-finish rolling flying shears and finish rolling by a finish rolling unit: performing head and tail shearing on the wire rods subjected to cooling in the step S5 through a pre-finish rolling flying shear (8), and performing groove rolling on the wire rods subjected to head and tail shearing through a finishing mill group (9);
s7: and (3) cooling treatment after finish rolling: cooling the wire rod subjected to the finish rolling in the step S6 through a finish rolling cooling box (10);
s8: rolling by a reducing mill set: performing pass rolling on the wire rod subjected to temperature reduction in the step S7 for 2 or 4 passes by using a reducing mill set (11);
s9: cooling after rolling by a reducing mill set: cooling the wire rod subjected to reducing rolling in the step S8 through a reducing cooling box (12);
s10: cutting the head and the tail by high-speed flying shear: cutting the wire rod with the temperature reduced in the step S9 at the position with unqualified wire rod head and tail sizes through a high-speed flying shear (13);
s11: spinning and looping: clamping the wire rod cut in the step S10 by a pinch roll (14), feeding the wire rod into a wire laying head (15) for laying wire and forming a ring, and making the wire rod into a ring shape;
s12: controlling cooling by an air cooling line: performing controlled cooling on the wire rod coil which passes through the wire laying machine (15) in the step S11 by using an air cooling mechanism (16);
s13: collecting the collection rolls: and (4) collecting the wire rod coil cooled and cooled in the step (S12) through a coil collecting station (17), cooling by a PF wire, bundling, weighing, labeling, coil unloading and storing in a warehouse (18).
6. The production method for improving the yield of the high-speed wire production line according to claim 5, wherein the production method comprises the following steps: in the step S1, the steel billet is heated to 950-1250 ℃ by using a walking beam type heating furnace, and the size of the heated steel billet is 150mm multiplied by 150 mm-170 mm multiplied by 170 mm.
7. The production method for improving the yield of the high-speed wire production line according to claim 5, wherein the production method comprises the following steps: controlling the deformation compression ratio of each pass to be 1.22-1.43 in the rough rolling process of the step S2, the deformation temperature to be 880-1030 ℃, and the running speed of a rolled piece in the rolling process of the rough rolling unit to be 0.08-2.00 m/S; in the step S3, the deformation compression ratio of each pass is controlled to be 1.22-1.38, the deformation temperature is 880-1000 ℃, and the running speed of the rolled piece is 0.8-10.00 m/S; in the step S4 pre-finish rolling process, the deformation compression ratio of each pass is controlled to be 1.20-1.35, the deformation temperature is 860-980 ℃, and the running speed of a rolled piece is 2.0-25.00 m/S; the deformation compression ratio of each pass is controlled to be 1.20-1.28 in the step S6 finish rolling process, the deformation temperature is 800-950 ℃, the running speed of a rolled piece is 9.0-95.00 m/S, the deformation compression ratio of each pass is controlled to be 1.20-1.30 in the step S8 reducing rolling process, the deformation temperature is 720-900 ℃, and the running speed of the rolled piece is 8.0-120.00 m/S.
8. The production method for improving the yield of the high-speed wire production line according to claim 5, wherein the production method comprises the following steps: and S4, rolling by the pre-finishing mill group, wherein two frames in the middle of the pre-finishing mill group (6) pass through the pre-finishing mill group, so that the stability of the whole-line production is kept.
9. The production method for improving the yield of the high-speed wire production line according to claim 5, wherein the production method comprises the following steps: the temperature reduction capacity of a single water tank of the pre-finish rolling cooling box (7) subjected to temperature reduction treatment after pre-finish rolling in the step S5 is 30-200 ℃, temperature recovery is realized between the water tanks through an air cooling section, and the temperature reduction amplitude of a rolled piece after pre-finish rolling and cooling is controlled to be 100-200 ℃; the cooling capacity of a single water tank of the finish rolling cooling box (10) subjected to cooling treatment after finish rolling in the step S7 is 30-180 ℃, temperature recovery is realized between the water tanks through an air cooling section, and the temperature reduction amplitude of a rolled piece after cooling is controlled to be 100-250 ℃ after finish rolling; when the reducing and cooling box (12) subjected to cooling treatment after reducing rolling in the step S9 is cooled, the head of the rolled piece is ensured to pass through the first water tank, then the water valve of the first water tank is started, the cooling capacity of the single water tank is 30-150 ℃, and the temperature reduction range of the cooled rolled piece is controlled to be 30-200 ℃ after passing through the reducing and sizing unit.
10. The production method for improving the yield of the high-speed wire production line according to claim 5, wherein the production method comprises the following steps: the spinning temperature of the spinning machine (15) in the step S11 is 700-900 ℃; the coiling temperature of the wire rod after the air cooling mechanism (16) in the step S12 is 350-600 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114589206A (en) * | 2022-03-31 | 2022-06-07 | 中冶赛迪工程技术股份有限公司 | Wire and rod production line, high-precision product intelligent control system suitable for wire and rod production line and control method |
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| CN113070339A (en) * | 2021-04-22 | 2021-07-06 | 中冶赛迪工程技术股份有限公司 | High-speed wire production system and method with reducing and sizing unit |
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| CN113414235A (en) * | 2021-06-15 | 2021-09-21 | 张敏 | Production system and method for improving productivity and product quality of high-speed wire production line |
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| CN105665442A (en) * | 2016-01-14 | 2016-06-15 | 中冶赛迪工程技术股份有限公司 | Coil production method and production line thereof |
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| CN114589206A (en) * | 2022-03-31 | 2022-06-07 | 中冶赛迪工程技术股份有限公司 | Wire and rod production line, high-precision product intelligent control system suitable for wire and rod production line and control method |
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Application publication date: 20211119 |