Rod and wire composite production system suitable for high-quality special steel production and production method thereof

Abstract

The invention relates to a bar and wire composite production system suitable for high-quality special steel production and a production method of the bar and wire composite production system. The production system comprises a common section, a bar production section and a wire production section, the common section comprises a heating furnace unit, a rough rolling unit, a first shearing unit, a head removal heat preservation unit, an intermediate rolling unit and a pre-finish rolling unit which are arranged in series; the bar production section comprises a bar finish rolling unit and a bar post-processing mechanism which are arranged in series; the wire rod production section comprises a wire rod finish rolling unit, a wire rod reducing and sizing unit and a wire rod post-processing mechanism which are arranged in series; a shunting bypass is further arranged between the bar production section and the wire production section, and the two ends of the shunting bypass are connected between the bar finish rolling unit and the bar post-processing mechanism in a bypass mode and between the wire reducing and sizing unit and the wire post-processing mechanism in a bypass mode respectively. According to the method, process path sharing and production line reuse of rod and wire production are efficiently realized, the process flexibility is high, the equipment utilization rate is effectively improved, the equipment investment and the occupied area are greatly reduced, the energy consumption and the operation cost are effectively reduced, and the overall integration level and the economical efficiency of a production system are remarkably improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bar and wire rod production, and particularly relates to a bar and wire rod composite production system suitable for high-quality steel production and a production method thereof. BACKGROUND

[0002] At present, the development of the steel industry has entered a new stage, and the market demand for high-quality steel continues to grow. Such steel has become an important material for high-end manufacturing due to its excellent performance, wide application field and high added value. In order to adapt to the continuous changes in the market, steel enterprises need to adopt more flexible production processes and innovative production technologies. Among them, the composite production technology of bar and wire rod is one of the important methods to cope with the above production challenges. However, the domestic and foreign bar and wire rod composite production lines are mainly suitable for the production of traditional building materials, and it is difficult to meet the production requirements of high-quality and high-efficiency high-quality steel. SUMMARY

[0003] The application relates to a bar and wire rod composite production system suitable for high-quality steel production and a production method thereof, and at least solves part of the defects of the prior art.

[0004] The application relates to a bar and wire rod composite production system suitable for high-quality steel production, which comprises a shared section, a bar production section and a wire rod production section.

[0005] The shared section comprises heating furnace units, rough rolling units, first shearing units, head-off heat preservation units, intermediate rolling units and pre-precision rolling units arranged in series.

[0006] The bar production section comprises bar precision rolling units and bar post-processing mechanisms arranged in series.

[0007] The wire rod production section comprises wire rod precision rolling units, wire rod reducing and sizing units and wire rod post-processing mechanisms arranged in series.

[0008] A shunt bypass is further arranged between the bar production section and the wire rod production section, one end of the shunt bypass is connected in parallel between the bar precision rolling units and the bar post-processing mechanisms, and the other end of the shunt bypass is connected in parallel between the wire rod reducing and sizing units and the wire rod post-processing mechanisms.

[0009] As one of the embodiments, the bar post-processing mechanism comprises upper steel brake aprons, cooling beds, cold shears, length measuring machines and baling devices arranged in series along the bar flow direction.

[0010] As one of the embodiments, the wire post-processing mechanism comprises a wire rod laying head, a first wire processing line, a second wire processing line and a P / F conveying line, the first wire processing line comprises a first coiling station, a heat preservation corridor and a core reel turnover device arranged in series, the second wire processing line comprises a loose coiling controlled cooling conveying unit, a second coiling station and a rotary core reel and is arranged with a quenching machine in the loose coiling controlled cooling conveying unit, the first coiling station and the loose coiling controlled cooling conveying unit are connected with the wire rod laying head respectively, and the core reel turnover device and the rotary core reel are connected with the P / F conveying line through a wire conveying trolley respectively.

[0011] As one of the embodiments, the pre-finishing rolling unit comprises a pre-finishing rolling unit and a pre-finishing post-water cooling device arranged at the outlet side of the pre-finishing rolling unit, and the bar production section and the wire production section are connected with the pre-finishing post-water cooling device respectively.

[0012] As one of the embodiments, the intermediate rolling unit comprises a first intermediate rolling unit, a first intermediate rolling post-water cooling device, a second shearing unit, a second intermediate rolling unit, a second intermediate rolling post-water cooling device and a third shearing unit arranged in series.

[0013] As one of the embodiments, the head-off heat preservation unit comprises a head-off heat preservation device and an induction heater connected with the outlet side of the head-off heat preservation device.

[0014] The application also relates to a production method of the bar-wire composite production system, which is used for the production of bar products and comprises the following steps:

[0015] After the casting blank is heated by the heating furnace unit, the casting blank is conveyed to the rough rolling unit for rough rolling;

[0016] After the rolled piece is roughed, the rolled piece is conveyed to the head-off heat preservation unit for heat preservation and then enters the intermediate rolling unit for further rolling;

[0017] The intermediate blank is selectively subjected to or not subjected to pre-finishing rolling;

[0018] The intermediate blank is conveyed to the bar finishing rolling unit for finishing rolling, and the finished bar product enters the bar post-processing mechanism for subsequent processing.

[0019] As one of the embodiments, when the bar product with a diameter of less than Φ20 mm is produced, the casting blank is sequentially subjected to the rough rolling unit, the first intermediate rolling unit, the second intermediate rolling unit and the pre-finishing rolling unit, and the first intermediate rolling post-water cooling device and the second intermediate rolling post-water cooling device are not used;

[0020] When producing the bar product with a diameter of 20mm or above and below 42mm, the casting blank is sequentially processed by the rough rolling unit, the first intermediate rolling unit, the second intermediate rolling unit, and the pre-precision rolling unit is bypassed; the first intermediate rolling post-water cooling device is not started, and the second intermediate rolling post-water cooling device is started.

[0021] When producing the bar product with a diameter of 42mm or above, the casting blank is sequentially processed by the rough rolling unit and the first intermediate rolling unit, the second intermediate rolling unit and the pre-precision rolling unit are bypassed, the first intermediate rolling post-water cooling device and the second intermediate rolling post-water cooling device are started.

[0022] The present application also relates to a production method of the above-mentioned bar and wire composite production system, which is used for the production of the wire product, and the production method comprises the following steps:

[0023] After the casting blank is heated and treated by the heating furnace unit, the casting blank is conveyed to the rough rolling unit for rough rolling;

[0024] After the rolled piece after rough rolling is heat preserved and conveyed by the head-off heat preservation unit, the rolled piece is further rolled by the intermediate rolling unit;

[0025] The intermediate blank is selectively pre-precision rolled or not pre-precision rolled;

[0026] The intermediate blank is conveyed to the bar precision rolling unit for precision rolling, and the wire product after precision rolling is conveyed to the wire post-processing mechanism for subsequent processing; or the intermediate blank is conveyed to the wire precision rolling unit for precision rolling, and the wire product after precision rolling is conveyed to the wire reducing unit for reducing treatment, and the wire product after reducing treatment is conveyed to the wire post-processing mechanism for subsequent processing.

[0027] As one of the embodiments, when producing the wire product with a diameter of 20mm or below, the casting blank is sequentially processed by the rough rolling unit, the first intermediate rolling unit, the second intermediate rolling unit and the pre-precision rolling unit, and the first intermediate rolling post-water cooling device and the second intermediate rolling post-water cooling device are not started.

[0028] When producing the wire product with a diameter of 20mm or above, the casting blank is sequentially processed by the rough rolling unit, the first intermediate rolling unit and the second intermediate rolling unit, and the pre-precision rolling unit is bypassed; the first intermediate rolling post-water cooling device is not started, and the second intermediate rolling post-water cooling device is started.

[0029] The present application has at least the following beneficial effects:

[0030] The present application realizes the unified deployment of the rod wire front process by setting the shared heating, rough rolling, intermediate rolling and pre-precision rolling processes. In addition, the process path sharing and production line reuse of rod wire production are realized by coupling the rod production section and the wire production section through the shunt bypass, and the process flexibility is high. The above configuration effectively improves the equipment utilization, greatly reduces the equipment investment and land area, effectively reduces the energy consumption and operation cost, and significantly improves the overall integration and economy of the production system.

[0031] The present application further has the following beneficial effects

[0032] In the present application, the rolling process is clearly segmented, and the temperature and shape control capability is strong. Through the reasonable configuration of the water cooling devices between each rolling unit, the precise control of the whole process temperature can be realized, which can greatly improve the quality of the rod wire products. By configuring the first intermediate rolling post-water cooling device and the second intermediate rolling post-water cooling device, for the situation that some units are bypassed in the subsequent process, early cooling and precise temperature control can be realized, and the adverse effects such as organization coarsening caused by invalid high temperature transmission can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0034] Figure 1 The composition arrangement drawing of the rod wire composite production system provided by the present application is shown in the following figure.

[0035] Figure 2 The composition arrangement drawing of the shared section is shown in the following figure.

[0036] Figure 3 The composition arrangement drawing of the rod production section and the wire production section is shown in the following figure. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0038] Embodiment one: as Figures 1-3 The present application provides a rod wire composite production system suitable for high-quality steel production, which comprises a shared section, a rod production section and a wire production section. The rod production section and the wire production section are arranged in parallel and connected with the shared section respectively.

[0039] The common section includes heating furnace unit 11, rough rolling unit 12, first shearing unit 122, head-off heat preservation unit 13, intermediate rolling unit and pre-finishing rolling unit 16 arranged in series;

[0040] The bar production section includes bar finishing rolling unit 21 and bar post-processing mechanism 22 arranged in series;

[0041] The wire production section includes wire finishing rolling unit 31, wire reducing unit 32 and wire post-processing mechanism 33 arranged in series;

[0042] The bar production section and the wire production section are further provided with a shunt bypass 4, one end of the shunt bypass 4 is connected in parallel between the bar finishing rolling unit 21 and the bar post-processing mechanism 22, and the other end of the shunt bypass 4 is connected in parallel between the wire reducing unit 32 and the wire post-processing mechanism 33.

[0043] The above common section is shared by bar production and wire production, and the intermediate blank output by the common section can be selectively sent to the bar production section or the wire production section.

[0044] The heating furnace unit 11 is used for heating the continuous casting blank delivered from the upstream. In an embodiment, the heating furnace unit 11 includes two heating furnaces 111 arranged in parallel, and one or both of the heating furnaces 111 can be flexibly started according to the production rhythm and process requirements. When both of the heating furnaces 111 are started, the following two blank feeding modes can be optionally used: one is that the continuous casting blanks are alternately fed into the two heating furnaces 111, that is, for two adjacent continuous casting blanks, the former is fed into the first heating furnace 111 and the latter is fed into the second heating furnace 111, thereby prolonging the in-furnace time of a single blank; the other is that after the first heating furnace 111 completes the heating task of all blanks, the second heating furnace 111 is switched to feed the subsequent blanks, realizing inter-furnace switching operation. Through the above flexible configuration, the heating furnace unit 11 can balance efficiency and quality, and meet the production requirements of multiple varieties and rhythms.

[0045] The heating furnace unit 11 further includes a descaling device 112, including but not limited to high-pressure water descaling, which is arranged at the outlet side of the heating furnace 111, and is used for removing the oxide scale on the surface of the steel blank to ensure the surface quality.

[0046] Optionally, as Figure 2 A steel blank rejection device 113 is further arranged at the outlet side of the descaling device 112, and unqualified steel blanks can be rejected.

[0047] The roughing rolling unit 12 is used to receive steel billets (square or rectangular billets) from the heating furnace unit 11 and perform rough rolling to obtain intermediate billets. Optionally, the roughing rolling unit 12 consists of 7 roughing rolling mills forming a roughing mill group 121. Preferably, pinch rolls are arranged on the inlet side of the roughing rolling unit 12.

[0048] The first shearing unit 122 is arranged on the exit side of the roughing unit 12 and is used for the head and tail shearing operation of the intermediate billet.

[0049] In one embodiment, such as Figure 2 The roll-off insulation unit 13 includes a roll-off insulation device 131 and an induction heater 132 connected to the outlet side of the roll-off insulation device 131. The roll-off insulation device 131 receives the intermediate billet from the roughing unit 12 and reduces heat loss during transport by using an insulation cover, ensuring uniform temperature and improving subsequent rolling quality. It can also break the continuous rolling relationship between the roughing unit 12 and the intermediate rolling unit, achieving process decoupling and rhythm buffering. The induction heater 132 is located after the roll-off insulation device 131 and can rapidly induction heat the intermediate billet to compensate for the temperature drop caused in the preceding process, ensuring that the temperature conditions of the intermediate billet meet the requirements of subsequent processes.

[0050] In one embodiment, such as Figure 2 The intermediate rolling unit includes a first intermediate rolling mill 141, a first intermediate rolling post-water cooling device 142, a second shearing unit 143, a second intermediate rolling mill 151, a second intermediate rolling post-water cooling device 152, and a third shearing unit 153 arranged in series. The first intermediate rolling mill 141, the first intermediate rolling post-water cooling device 142, and the second shearing unit 143 constitute a first intermediate rolling module 14, capable of performing the first intermediate rolling process; the second intermediate rolling mill 151, the second intermediate rolling post-water cooling device 152, and the third shearing unit 153 constitute a second intermediate rolling module 15, capable of performing the second intermediate rolling process.

[0051] By setting up a first intermediate rolling mill group 141 and a second intermediate rolling mill group 151, the intermediate billet can be rolled in multiple passes, further reducing the size of the intermediate billet. Optionally, both the first intermediate rolling mill group 141 and the second intermediate rolling mill group 151 include 6 intermediate rolling mill stands.

[0052] By configuring a first intermediate rolling mill 142 and a second intermediate rolling mill 152 after the first intermediate rolling mill 141 and the second intermediate rolling mill 151 respectively, the intermediate billet can be initially water-cooled, the grain growth after recrystallization can be controlled, and the metallographic structure and mechanical properties can be optimized.

[0053] Based on the above-mentioned intermediate rolling unit arrangement structure, the flexibility of intermediate rolling production can be greatly improved, and the production of bars and wires, as well as the production of ordinary steel and special steel, can be better met. Taking the rolling through one intermediate rolling mill set as one round of intermediate rolling, and taking the cooling through one intermediate rolling post-cooling device as one round of intermediate rolling cooling, the above-mentioned intermediate rolling unit includes but is not limited to the following modes:

[0054] ①, one round of intermediate rolling;

[0055] ②, one round of intermediate rolling + one round of intermediate rolling cooling;

[0056] ③, one round of intermediate rolling + two rounds of intermediate rolling cooling;

[0057] ④, two rounds of intermediate rolling + one round of intermediate rolling cooling (the intermediate rolling cooling is preferably realized through the second intermediate rolling post-cooling device 152);

[0058] ⑤, two rounds of intermediate rolling;

[0059] ⑥, two rounds of intermediate rolling + two rounds of intermediate rolling cooling.

[0060] Preferably, pinch rolls are arranged at the inlet side of the first intermediate rolling mill set 141 respectively.

[0061] In one of the embodiments, as Figure 2 , the pre-finishing rolling unit 16 includes a pre-finishing rolling mill set 161 and a pre-finishing post-cooling device 162 arranged at the outlet side of the pre-finishing rolling mill set 161, and the bar production section and the wire production section are respectively connected with the pre-finishing post-cooling device 162.

[0062] The above-mentioned pre-finishing rolling mill set 161 is used for fine rolling of the intermediate bloom, preparing for finishing rolling, and improving the finishing rolling quality. The pre-finishing post-cooling device 162 is used for water cooling of the intermediate bloom, ensuring the inlet temperature when entering the finishing rolling; optionally, the pre-finishing post-cooling device 162 includes three water tanks arranged in series, and the water tank length includes but is not limited to about 6m.

[0063] In one of the embodiments, as Figure 3 , the bar finishing rolling unit 21 includes a bar finishing rolling mill set 211 and a first finishing post-cooling device 212, the bar finishing rolling mill set 211 is used for final finishing rolling of the intermediate bloom, and the first finishing post-cooling device 212 is used for water cooling and temperature control of the bar finished product; optionally, the first finishing post-cooling device 212 includes three water tanks arranged in series, and the water tank length includes but is not limited to about 6m.

[0064] Further, a fourth shearing unit 213 is arranged at the inlet side of the bar finishing rolling mill set 211, a fifth shearing unit 214 is arranged at the outlet side of the first finishing post-cooling device 212, and further, pinch rolls can be arranged at the inlet side of the fifth shearing unit 214.

[0065] Optionally, a pinch roll is arranged at the inlet side of the bar finishing rolling mill train 211; when the fourth shearing unit 213 is arranged, the pinch roll can be arranged at the inlet side of the fourth shearing unit 213.

[0066] In one of the embodiments, as Figure 3 , the bar post-processing mechanism 22 comprises, in sequence along the bar flow direction, an upper steel brake apron 221, a cooling bed 222, a cold shearing machine 223, a sizing machine 224, and a bundling device.

[0067] Wherein:

[0068] The upper steel brake apron 221 is used to guide the bar after rolling forming to enter the cooling bed 222 stably at a reduced speed;

[0069] The cooling bed 222 is used to uniformly cool the bar and naturally straighten it;

[0070] The cold shearing machine 223 and the sizing machine 224 are used to shear the bar into a sizing length;

[0071] The bundling device is used for bundling the sized bar, and realizing subsequent heat treatment or warehouse process according to process requirements. In the embodiment, as Figure 3 , the manual bundling device 225 and the automatic bundling device 2282 are integrated, and the two are arranged in parallel to adapt to different process paths. Among them, the manual bundling device 225 is mainly used for the scene that needs to be slowly cooled and heat treated; since heat treatment depends on the high-temperature residual heat of the bar itself, the bundling operation needs to be completed quickly after offline, therefore, the manual bundling method is convenient for quick processing, and meets the moderate requirement of slow cooling on the tightness of bundling. The bar product after bundling is directly sent to the slow cooling pit 226 to realize the heat treatment effect of utilizing residual heat through slow cooling, thereby improving the organization and performance of the bar. After the heat treatment is completed, the bar needs to be lifted out of the pit, the manually bundled strips are cut off, and the standardized bundling, labeling and warehousing operations are re-performed. In contrast, the automatic bundling device 2282 is mainly suitable for finished bar products that do not need heat treatment and can be directly warehoused; the device is connected with the bar conveying roller through the steel moving rack 2281, after automatic bundling, the finished bar product is conveyed to the collection rack 2283 for centralized storage, forming a neat and orderly finished product area, and then hoisted into the finished product warehouse by the crane.

[0072] Optionally, as Figure 3 , a short-length collecting device 227 can be configured beside the manual bundling device 225 and the automatic bundling device 2282.

[0073] In one of the embodiments, the above-mentioned bar production section can realize the production of Φ15mm~Ф65mm specification straight bar products.

[0074] In one of the embodiments, as Figure 3 The wire finishing unit 31 comprises a wire finishing mill train 311 and a second post-finishing water cooling device 312. The wire finishing mill train 311 is used for the final finishing of the intermediate blank to achieve the required size specification of the wire product, and through multiple passes of high-speed rolling, the wire is ensured to have excellent size consistency and mechanical properties. Optionally, the wire finishing mill train 311 comprises 8 finishing mills. The second post-finishing water cooling device 312 is used for water cooling and temperature control of the wire after finishing. Optionally, the second post-finishing water cooling device 312 comprises 3 water tanks arranged in series, and the length of the water tank includes but is not limited to about 6m.

[0075] Further, a sixth shearing unit 313 is arranged at the inlet side of the wire finishing mill train 311. Optionally, a pinch roll is arranged at the inlet side of the wire finishing mill train 311, and when the sixth shearing unit 313 is arranged, the pinch roll can be arranged at the inlet side of the sixth shearing unit 313.

[0076] In one of the embodiments, as Figure 3 The wire reducing sizing unit 32 comprises a reducing sizing mill train 321 and a post-reducing sizing water cooling device 322. The reducing sizing mill train 321 is used for reducing and final sizing of the finished wire to ensure the dimensional accuracy of the wire product. Optionally, the reducing sizing mill train 321 comprises 4 reducing sizing mills. The post-reducing sizing water cooling device 322 is used to control the temperature at the inlet of the wire post-processing mechanism 33 to further improve the organization and performance of the wire product. Optionally, the post-reducing sizing water cooling device 322 comprises 2 water tanks arranged in series, and the length of the water tank includes but is not limited to about 6m.

[0077] In one of the embodiments, as Figure 3 The wire post-processing mechanism 33 comprises a wire laying head 331, a first wire processing line, a second wire processing line, and a P / F transport line 339. The first wire processing line comprises a first coiling station 332, a heat preservation corridor 333, and a core reel turnover device 338 arranged in series. The second wire processing line comprises a loose coiling controlled cooling transport unit 334, a second coiling station 336, and a rotary core reel 337, and a quenching machine 335 is arranged in the loose coiling controlled cooling transport unit 334. The first coiling station 332 and the loose coiling controlled cooling transport unit 334 are connected to the wire laying head 331, respectively. The core reel turnover device 338 and the rotary core reel 337 are connected to the P / F transport line 339 through a wire coiling trolley, respectively.

[0078] The wire laying head 331 is used to spray the high-speed wire after reducing sizing into a spiral coil. The first wire processing line and the second wire processing line are connected in parallel, and the wire product output by the wire laying head 331 can selectively enter the first wire processing line or the second wire processing line.

[0079] In the first wire processing line, the first collecting station 332 is used to collect high-temperature wires to ensure their stable entry into the subsequent heat treatment passage 333; the heat treatment passage 333 can be used for heat treatment of steel grades that need to be slowly cooled or isothermally treated to improve the wire organization performance, which is particularly suitable for the production needs of special steel; the core frame turnover device 338 is used to rotate and turn the loose coil after heat treatment to a horizontal state; and the coil transporting trolley can transport the loose coil in the horizontal state out and hang it on the C-shaped hook of the P / F transport line 339.

[0080] In the second wire processing line, the loose coil controlled cooling transport unit 334 can obtain ideal metallographic structure and mechanical properties of the product through a set cooling program according to the product specifications, steel grades and end uses, which includes but is not limited to the use of a loose coil controlled cooling transport machine, including but not limited to air cooling treatment; the quenching machine 335 arranged in the loose coil controlled cooling transport unit 334 can be used for quenching treatment of the wire according to the needs to improve the quality of the wire product. The second collecting station 336 is used to collect the cooled wire coil into a vertical loose coil for subsequent transportation; the rotary core frame 337 is used to rotate and turn the loose coil to a horizontal position; and the coil transporting trolley can transport the horizontal loose coil out and hang it on the C-shaped hook of the P / F transport line 339.

[0081] Preferably, as Figure 3 The heat treatment passage 333 is arranged adjacent to the loose coil controlled cooling transport unit 334, for example, the heat treatment passage 333 is arranged around the loose coil controlled cooling transport machine, which realizes compact structure, effectively reduces heat loss and improves the energy utilization rate of the heat treatment and controlled cooling process.

[0082] The P / F transport line 339 is used for automatic transfer of the finished coil, completes subsequent operations such as surface inspection, head and tail trimming, inspection sampling, compression and bundling while the loose coil is continuously cooled, and accordingly, the P / F transport line 339 is connected with an automatic packing machine 3391, a weighing device 3392 and a coil unloading station 3393 and the like.

[0083] The production system provided in the embodiment reasonably designs and arranges the bar production section and the wire production section in the non-shared part, constructs flexible manufacturing capacity for the whole process of the bar and wire, can cover the processing needs of various special steel products, and has good specification compatibility and process adaptability.

[0084] In one of the embodiments, the wire production section can realize the production of Ф5.5mm~Ф25mm specification wire rod products; alternatively, the process flow of the wire finishing unit 31-wire reducing unit 32-wire post-processing mechanism 33 is mainly used to realize the production of Ф5.5mm~Ф20mm specification wire rod products, and the process flow of the bar finishing unit 21-shunt bypass 4-wire post-processing mechanism 33 can realize the production of Ф22mm~Ф25mm specification wire rod products.

[0085] Embodiment two: the embodiment of the present application provides a production method of the above-mentioned bar-wire composite production system. Specifically, the production system is used for the production of bar products, and the production method comprises the following steps:

[0086] After the casting blank is heated by the heating furnace unit 11, it is conveyed to the rough rolling unit 12 for rough rolling;

[0087] After the rough rolling, the rolled piece is conveyed after heat preservation by the head removal heat preservation unit 13, and then enters the intermediate rolling unit for further rolling;

[0088] When the pre-finishing unit 16 is provided, the intermediate blank can be selectively pre-finished by the pre-finishing unit 16;

[0089] The intermediate blank is conveyed to the bar finishing unit 21 for finishing, and the finished bar product enters the bar post-processing mechanism 22 for subsequent processing.

[0090] Among them, as mentioned in the above embodiment one, in the intermediate rolling unit, there can be multiple intermediate rolling modes.

[0091] Preferably, when producing bar products with a specification of Ф20mm or below (target < Ф20mm), the casting blank is sequentially processed by the rough rolling unit 121-the first intermediate rolling unit 141-the second intermediate rolling unit 151-the pre-finishing unit 161, and the first intermediate rolling post-water cooling device 142 and the second intermediate rolling post-water cooling device 152 are not used;

[0092] When producing bar products with a specification of Ф20mm or above and Ф42mm or below (Ф20mm≤target < Ф42mm), the casting blank is sequentially processed by the rough rolling unit 121-the first intermediate rolling unit 141-the second intermediate rolling unit 151, and the pre-finishing unit 161 is bypassed; the first intermediate rolling post-water cooling device 142 is not used, and the second intermediate rolling post-water cooling device 152 is used, so that the grain coarsening phenomenon of the intermediate blank during the bypassing of the pre-finishing unit 161 can be avoided.

[0093] When producing bar products of Ф42 mm and above (target Ф42 mm), the casting blank is sequentially processed by the rough rolling mill set 121 - the first intermediate rolling mill set 141, and the second intermediate rolling mill set 151 and the pre-precision rolling unit 16 is bypassed; the first intermediate rolling post-water cooling device 142 and the second intermediate rolling post-water cooling device 152 are enabled to rapidly cool the intermediate blank. Among them, the cooling parameters of the two water cooling devices can be designed to be the same as but not limited to the cooling parameters of the first water tank in the pre-precision rolling unit 16, so as to realize the cooling effect of stable structure and uniform organization. The design strategy effectively avoids the re-coarsening of the already rolled fine organization structure due to high-temperature bypassing by implementing temperature control processing in advance under the condition of bypassing in subsequent passes.

[0094] Specific embodiment 1: relates to the production process of Ф15 mm bar, which is carried out in the following order:

[0095] (1) Heating and billet transportation: the continuous casting blank is alternately sent to two heating furnaces 111 for heating. After being discharged, the high-pressure water descaling device 112 is used to remove the iron scale, and the billet rejection device 113 is used to reject unqualified billets; after the qualified billets are heated to the target temperature, they are transported to the inlet of the rough rolling mill set 121;

[0096] (2) Rough rolling process: the heated billets are rolled by the rough rolling mill set 121 in multiple passes; if it is a 180x180 mm square billet, it is rolled for 6 passes; if it is a 180x240 mm rectangular billet, it is rolled for 7 passes; then the head shearing of the rolled piece is completed by the first shearing unit 122;

[0097] (3) Head removal and induction heating: the rolled piece is heat preserved and transported by the head removal heat preservation device 131, and further heated in the induction heater 132;

[0098] (4) First intermediate rolling process (without water cooling): after the rolled piece is rolled by the first intermediate rolling mill set 141, the head and tail shearing is completed by the second shearing unit 143;

[0099] (5) Second intermediate rolling process (without water cooling): the rolled piece enters the second intermediate rolling mill set 151 for continuous rolling, and the head and tail shearing is completed by the third shearing unit 153;

[0100] (6) Pre-precision rolling process: the rolled piece after the second intermediate rolling mill set 151 is rolled into the pre-precision rolling mill set 161 for continuous rolling, and is cooled by the pre-precision rolling post-water cooling device 162;

[0101] (7) Bar precision rolling and bar post-processing are performed.

[0102] Specific embodiment 2: relates to the production process of Ф20 mm bar, which is carried out in the following order:

[0103] (1) Heating and billet transportation: the continuous casting billets are alternately sent into the heating furnace 111 for heating. After being discharged, the high-pressure water descaling device 112 is used to remove the oxide scale, and the billet rejection device 113 is used to reject unqualified billets; after being heated to the target temperature, the qualified billets are transported to the inlet of the rough rolling mill group 121;

[0104] (2) Rough rolling process: the heated billets are subjected to multi-pass rolling by the rough rolling mill group 121; if it is a 180x180mm square billet, 6-pass rolling is performed; if it is a 180x240mm rectangular billet, 7-pass rolling is performed; then the head shearing of the intermediate billet is completed by the first shearing unit 122;

[0105] (3) Head removal and induction heating: the rolled piece is subjected to heat preservation and transportation by the head removal heat preservation device 131, and is further heated in the induction heater 132;

[0106] (4) First intermediate rolling process (without water cooling): after being rolled by the first intermediate rolling mill group 141, the rolled piece is subjected to head and tail shearing by the second shearing unit 143;

[0107] (5) Second intermediate rolling process (water cooling is enabled): after being rolled by the first intermediate rolling mill group 141, the rolled piece is sequentially subjected to rolling by the second intermediate rolling mill group 151, cooling by the second intermediate rolling after water cooling device 152, and then the head and tail are sheared off by the third shearing unit 153;

[0108] (6) Pre-finishing rolling process (passing through): after the rolled piece passes through the pre-finishing rolling mill group 161, it is cooled by the pre-finishing after water cooling device 162 to control the inlet temperature of the finishing rolling;

[0109] (7) Rod finishing rolling and rod post-processing are performed.

[0110] Specific embodiment 3: relates to the production process of Ф42mm rod, which is performed in the following order:

[0111] (1) Heating and billet transportation: the continuous casting billets are alternately sent into the heating furnace 111 for heating. After being discharged, the high-pressure water descaling device 112 is used to remove the oxide scale, and the billet rejection device 113 is used to reject unqualified billets; after being heated to the target temperature, the qualified billets are transported to the inlet of the rough rolling mill group 121;

[0112] (2) Rough rolling process: the heated billets are subjected to multi-pass rolling by the rough rolling mill group 121; if it is a 180x180mm square billet, 6-pass rolling is performed; if it is a 180x240mm rectangular billet, 7-pass rolling is performed; then the head shearing of the intermediate billet is completed by the first shearing unit 122;

[0113] (3) Head removal and induction heating: the rolled piece is subjected to heat preservation and transportation by the head removal heat preservation device 131, and is further heated in the induction heater 132;

[0114] (4) First intermediate rolling process (water cooling enabled): after the rolled piece is rolled by the first intermediate rolling mill group 141, it is immediately cooled by the first intermediate rolling post-water cooling device 142, and the head and tail are sheared by the second shearing unit 143;

[0115] (5) Second intermediate rolling process (passing, water cooling enabled): after the rolled piece is rolled by the first intermediate rolling mill group 141, it passes through the second intermediate rolling mill group 151, and is cooled by the second intermediate rolling post-water cooling device 152;

[0116] (6) Pre-finishing rolling process (passing): after the rolled piece passes through the pre-finishing rolling mill group 161 (passing), it is cooled by the pre-finishing rolling post-water cooling device 162;

[0117] (7) Rod finishing rolling and rod post-processing are performed.

[0118] Example Three: The example of the present application provides a production method of the above-mentioned rod and wire composite production system. Specifically, the production system is used for the production of wire products, and the production method comprises:

[0119] After the casting blank is heated by the heating furnace unit 11, it is conveyed to the rough rolling unit 12 for rough rolling;

[0120] After the rolled piece after rough rolling is heat preserved by the head removal heat preservation unit 13, it enters the intermediate rolling unit for further rolling;

[0121] When the pre-finishing rolling unit 16 is provided, the intermediate blank can be optionally pre-finished by the pre-finishing rolling unit 16;

[0122] The intermediate blank is conveyed to the rod finishing rolling unit 21 for finishing rolling, and the finished wire product enters the wire post-processing mechanism 33 for subsequent processing through the shunt bypass 4; or the intermediate blank is conveyed to the wire finishing rolling unit 31 for finishing rolling, and the finished wire product enters the wire reducing sizing unit 32 for reducing sizing processing, and the wire product after reducing sizing processing enters the wire post-processing mechanism 33 for subsequent processing.

[0123] Among them, as mentioned in the above-mentioned example one, in the intermediate rolling unit, there can be multiple intermediate rolling modes.

[0124] Preferably, when producing wire products with a specification of Φ20 mm and below (target ≤ Ф20 mm), the casting blank is sequentially processed by the rough rolling mill group 121-the first intermediate rolling mill group 141-the second intermediate rolling mill group 151-the pre-finishing rolling mill group 161, and the first intermediate rolling post-water cooling device 142 and the second intermediate rolling post-water cooling device 152 are not enabled; wherein the intermediate blank is sequentially processed by the wire finishing rolling unit 31, the wire reducing sizing unit 32 and the wire post-processing mechanism 33;

[0125] When the wire rod product with a size of Ф20 mm or more (target > Ф20 mm) is produced, the cast blank is sequentially processed by the rough rolling mill set 121, the first intermediate rolling mill set 141, and the second intermediate rolling mill set 151, and the pre-precision rolling mill set 161 is bypassed; the first intermediate rolling post-water cooling device 142 is not activated, and the second intermediate rolling post-water cooling device 152 is activated, so that the grain coarsening phenomenon of the intermediate blank during bypassing the pre-precision rolling mill set 161 can be avoided.

[0126] Specific embodiment 1: relates to the production process of Ф5.5 mm wire rod, which is carried out in the following order:

[0127] (1) Heating and billet transportation: the continuous casting blank is alternately sent to two heating furnaces 111 for heating; after being discharged from the furnace, the high-pressure water descaling device 112 is used to remove the iron oxide scale, and the billet rejection device 113 is used to reject unqualified billets; after the qualified billets are heated to the target temperature, they are transported to the inlet of the rough rolling mill set 121;

[0128] (2) Rough rolling process: the heated billets are subjected to multi-pass rolling by the rough rolling mill set 121; if it is a 180x180 mm square billet, 6 passes of rolling are performed; if it is a 180x240 mm rectangular billet, 7 passes of rolling are performed; then the head shearing of the rolled piece is completed by the first shearing unit 122;

[0129] (3) Head removal and induction heating: the rolled piece is transported by the head removal heat preservation device 131 and further heated in the induction heater 132;

[0130] (4) First intermediate rolling process (without water cooling): after the rolled piece is rolled by the first intermediate rolling mill set 141, head and tail shearing is performed by the second shearing unit 143;

[0131] (5) Second intermediate rolling process (without water cooling): the rolled piece enters the second intermediate rolling mill set 151 for further rolling, and head and tail shearing is completed by the third shearing unit 153;

[0132] (6) Pre-precision rolling process: the rolled piece after the second intermediate rolling mill set 151 is rolled enters the pre-precision rolling mill set 161 for further rolling, and cooling is performed by the pre-precision rolling post-water cooling device 162;

[0133] (7) Precision rolling process: the wire rod precision rolling mill set 311 performs high-precision rolling on the rolled piece, and then the second precision rolling post-water cooling device 312 is entered for cooling;

[0134] (8) Reducing process: the rolled piece enters the reducing mill set 321 to complete the final rolling, and is cooled by the reducing post-water cooling device 322 to ensure the temperature requirement before entering the wire drawing process;

[0135] (9) Wire rod post-processing (divided into conventional and heat preservation types):

[0136] Conventional steel: the rolled piece is spirally sprayed into a coil by the laying head 331, enters the air cooling transport device for air cooling treatment, and is quenched by the quenching device 335 if necessary. Then, the coil is collected by the second coil collecting station 336, rotated to the horizontal position by the coil core rotating device 337, and transported to the P / F transport line 339 by the coil transport trolley.

[0137] Heat preservation steel: after the rolled piece is formed into a coil by the laying head 331, it is directly collected by the first coil collecting station 332, transported in the heat preservation corridor 333, rotated to the horizontal position by the coil core rotating device 338, and then transported to the P / F transport line 339 by the coil transport trolley.

[0138] Specific embodiment 2: a production process of Ф22 mm wire rod is performed in the following order:

[0139] (1) Heating and billet transportation: the continuous casting billets are alternately sent into two heating furnaces 111 for heating; after being discharged from the furnace, the high-pressure water descaling device 112 is used to remove the iron oxide scale, and the billet rejection device 113 is used to reject unqualified billets; after being heated to the target temperature, the qualified billets are transported to the inlet of the rough rolling mill train 121;

[0140] (2) Rough rolling process: the heated billets are rolled by the rough rolling mill train 121 in multiple passes; if it is a 180x180 mm square billet, 6 passes are performed; if it is a 180x240 mm rectangular billet, 7 passes are performed; then the head cutting of the rolled piece is completed by the first cutting unit 122;

[0141] (3) Head removal and induction heating: the rolled piece is transported in the heat preservation device 131 and further heated in the induction heater 132;

[0142] (4) First intermediate rolling process (without water cooling): after the rolled piece is rolled by the first intermediate rolling mill train 141, the head and tail cutting is completed by the second cutting unit 143;

[0143] (5) Second intermediate rolling process (with water cooling): the rolled piece is continuously rolled by the second intermediate rolling mill train 151, cooled in the second intermediate rolling post-water cooling device 152, and the head and tail cutting is completed by the third cutting unit 153;

[0144] (6) Pre-finishing rolling process (empty pass): after the rolled piece passes through the pre-finishing rolling mill train 161 (empty pass), it is cooled in the pre-finishing post-water cooling device 162;

[0145] (7) Finishing rolling process: the rolled piece enters the bar finishing rolling mill train 211 to complete the final rolling, is cooled in the first finishing post-water cooling device 212, and is transported to the laying head process by the shunt bypass 4;

[0146] (8) Wire rod post-treatment (divided into conventional and heat preservation types):

[0147] Conventional steel: the rolled piece is spirally sprayed into a coil by the spinning machine 331, enters the air cooling transport machine for air cooling treatment, is quenched by the quenching machine 335 if necessary, then the coil collection is completed by the second coil collection station 336, the rotary core rack 337 is rotated to the horizontal position, and the rolled piece is transported to the P / F transport line 339 by the coil transport trolley;

[0148] The rolled piece is directly collected by the first coil collection station 332 after being coiled by the spinning machine 331, is transported in the heat preservation corridor 333 for heat preservation, is rotated to the horizontal position by the core rack turnover device 338, and is transported to the P / F transport line 339 by the coil transport trolley.

[0149] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A bar-wire composite production system suitable for high-quality steel production, characterized in that, The production system comprises a common section, a bar production section and a wire production section, the bar production section and the wire production section are arranged in parallel and are connected to the common section respectively; The common section comprises heating furnace units, rough rolling units, a first shearing unit, a head-off heat preservation unit, a medium rolling unit and a pre-finishing rolling unit arranged in series; The bar production section comprises a bar finishing rolling unit and a bar post-processing mechanism arranged in series; The wire production section comprises a wire finishing rolling unit, a wire reducing unit and a wire post-processing mechanism arranged in series; A shunt bypass is arranged between the bar production section and the wire production section, one end of the shunt bypass is connected to the bar finishing rolling unit and the bar post-processing mechanism in parallel, and the other end of the shunt bypass is connected to the wire reducing unit and the wire post-processing mechanism in parallel.

2. The bar-wire composite production system suitable for high-quality steel production according to claim 1, characterized in that, The bar post-processing mechanism comprises an upper steel brake apron, a cooling bed, a cold shearing machine, a sizing machine and a baling device arranged in series along the bar flow direction.

3. The bar-wire composite production system suitable for high-quality steel production according to claim 1, characterized in that, The wire post-processing mechanism comprises a wire laying machine, a first wire processing line, a second wire processing line and a P / F transport line, the first wire processing line comprises a first coiling station, a heat preservation corridor and a core frame turnover device arranged in series, the second wire processing line comprises a loose coiling controlled cooling transport unit, a second coiling station and a rotary core frame, and a quenching machine is arranged in the loose coiling controlled cooling transport unit, the first coiling station and the loose coiling controlled cooling transport unit are connected to the wire laying machine respectively, and the core frame turnover device and the rotary core frame are connected to the P / F transport line through a wire transport trolley respectively.

4. The bar-wire composite production system suitable for high-quality steel production according to claim 1, characterized in that: The pre-finishing rolling unit comprises a pre-finishing rolling unit and a pre-finishing rolling post-water cooling device arranged at the outlet side of the pre-finishing rolling unit, and the bar production section and the wire production section are connected to the pre-finishing rolling post-water cooling device respectively.

5. The bar-wire composite production system suitable for high-quality steel production according to claim 1, characterized in that: The medium rolling unit comprises a first medium rolling unit, a first medium rolling post-water cooling device, a second shearing unit, a second medium rolling unit, a second medium rolling post-water cooling device and a third shearing unit arranged in series.

6. The bar-wire composite production system suitable for high-quality steel production according to claim 1, characterized in that: The head-off heat preservation unit comprises a head-off heat preservation device and an induction heater connected to the outlet side of the head-off heat preservation device.

7. The production method of a bar-wire composite production system suitable for the production of special steel according to any one of claims 1 to 6, characterized in that, The production system is used for producing bar products, and the production method comprises the following steps: After the casting blank is heated by the heating furnace unit, the casting blank is transported to the rough rolling unit for rough rolling; After the rolled piece is heat preserved and transported by the head-off heat preservation unit, the rolled piece is further rolled by the medium rolling unit; The intermediate blank is selectively pre-finished or not pre-finished; The intermediate blank is transported to the bar finishing rolling unit for finishing rolling, and the finished bar product enters the bar post-processing mechanism for subsequent processing.

8. The production method according to claim 7, wherein when the bar product with a diameter of less than Φ20 mm is produced, the casting blank is sequentially processed by the rough rolling unit, the first medium rolling unit, the second medium rolling unit and the pre-finishing rolling unit, and the first medium rolling post-water cooling device and the second medium rolling post-water cooling device are not started; when the bar product with a diameter of Φ20 mm or above and less than Φ42 mm is produced, the casting blank is sequentially processed by the rough rolling unit, the first medium rolling unit and the second medium rolling unit, and the pre-finishing rolling unit is bypassed; the first medium rolling post-water cooling device is not started, and the second medium rolling post-water cooling device is started. When producing the bar product with a diameter of Ф42mm or above, the casting blank is processed in sequence by the rough rolling unit-the first intermediate rolling unit, the second intermediate rolling unit and the pre-precision rolling unit are bypassed, the first intermediate rolling post-water cooling device and the second intermediate rolling post-water cooling device are started.

9. The production method of a bar-wire composite production system suitable for the production of special steel according to any one of claims 1 to 6, characterized in that, The production system is used for the production of wire products, and the production method comprises: After the casting blank is heated by the heating furnace unit, it is conveyed to the rough rolling unit for rough rolling; After the rolled piece is roughed, it is conveyed to the head-off heat preservation unit for heat preservation and then enters the intermediate rolling unit for further rolling; The intermediate blank is selectively pre-precision rolled or not; The intermediate blank is conveyed to the bar precision rolling unit for precision rolling, and the precision-rolled wire product enters the wire post-processing mechanism for subsequent processing through the shunt bypass; or the intermediate blank is conveyed to the wire precision rolling unit for precision rolling, and the precision-rolled wire product enters the wire reducing unit for reducing treatment, and the reduced wire product enters the wire post-processing mechanism for subsequent processing.

10. The production method according to claim 9, wherein, When producing the wire product with a diameter of Ф20mm or below, the casting blank is processed in sequence by the rough rolling unit-the first intermediate rolling unit-the second intermediate rolling unit-the pre-precision rolling unit, and the first intermediate rolling post-water cooling device and the second intermediate rolling post-water cooling device are not started; When producing the wire product with a diameter of Ф20mm or above, the casting blank is processed in sequence by the rough rolling unit-the first intermediate rolling unit-the second intermediate rolling unit, and the pre-precision rolling unit is bypassed; the first intermediate rolling post-water cooling device is not started, and the second intermediate rolling post-water cooling device is started.

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