High-speed wire rod slitting and rolling method

Abstract

The invention relates to the technical field of steel rolling, and particularly discloses a high-speed wire rod slitting rolling method which comprises the following steps: blank heating: heating a steel blank to 1050-1100 DEG C, and keeping rolling plasticity; rough rolling and intermediate rolling: rolling the steel billets into intermediate billets through 1 #-9 # rolling mills; in the step of pre-finish rolling and segmentation, two pre-rolled pieces with the diameter phi being 24 mm are obtained through segmentation rolling through a 13 #-18 # pre-finish rolling machine, a double-line segmentation system and a shared channel system are adopted in a segmentation composite high-line production line, the double-line segmentation system is formed by transforming a 2 # small rod production line into a double-segmentation composite high-line production line, and the double-segmentation composite high-line production line comprises a north line segmentation channel and a south line segmentation channel. A steel splitting device is arranged behind the 18 # pre-finishing mill; finish rolling and cooling: respectively passing the cut wire through a north line or south line finish rolling unit, then looping by a silking machine, and cooling by a scattered coil air cooling line; the production capacity and the economic benefit are improved by cutting the hole pattern and splitting the steel conveying curve guide groove, and the multi-specification requirements of the market are met.

Description

Technical Field

[0001] The present invention relates to the technical field of steel rolling, and particularly relates to a high-speed wire rod split rolling method. Background Art

[0002] There are four production lines in the steel rolling project (Phase I) of the advanced special steel industrial base project, and only one high-speed wire rod production line with an annual production capacity of about 800,000 t / a. The 2# production line in the first steel rolling workshop is restricted by market demand and billet supply, and the operating rate is only 50%, with low utilization efficiency.

[0003] Problems of production line capacity and flexibility: Among the four production lines in the first-phase project, there is only one high-speed wire rod production line with limited capacity. The operating rate of the 2# small bar production line is low, with insufficient utilization, and the functions of each production line are fixed, unable to flexibly adjust the production product type according to market demand, resulting in limited overall production efficiency and inability to maximize profits.

[0004] The existing process cannot meet the requirements: The existing wire rod rolling process is designed for a single product and does not consider the composite production requirements. When producing products of different specifications, there is a lack of efficient split process technology, and it is impossible to improve the output and quality by optimizing the process, which limits the competitiveness of the enterprise in the market. Therefore, a high-speed wire rod split rolling method is designed to solve the problems of limited capacity and unreasonable utilization of the existing high-speed wire rod production line. Summary of the Invention

[0005] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a high-speed wire rod split rolling method.

[0006] The technical solution adopted by the present invention to solve its technical problems is: A high-speed wire rod split rolling method, comprising the following steps:

[0007] 1) Billet heating: The steel billet is heated to 1050 - 1100 °C to maintain rolling plasticity;

[0008] 2) Rough rolling and medium rolling: The steel billet is rolled into an intermediate billet by the 1# - 9# rolling mills;

[0009] 3) Pre-finishing and splitting: After passing through the 13# - 18# pre-finishing mills, it is split and rolled into 2 pre-rolled pieces with a diameter of φ24 mm. The split composite high-speed wire rod production line adopts a double-line splitting system and a common channel system. The double-line splitting system is to transform the 2# small bar production line into a double-split composite high-speed wire rod production line. The double-split composite high-speed wire rod production line includes two splitting channels, namely the north line and the south line. A steel separating device is arranged behind the 18# pre-finishing mill;

[0010] 4) Finishing and cooling: The split wire rods respectively pass through the north line or south line finishing mill units, control the rolling speed at 100 - 120 m / s, and then are coiled by the laying head and cooled by the loose coil air cooling line.

[0011] Specifically, the size of the intermediate billet in step (2) is 39mm * 70mm.

[0012] Specifically, the common channel system in step (3) is to set an electric base switching device after the No. 2 pre-finishing rolling. The electric base switching device is connected to the 1# - 18# rolling mills of the bar production line and the double-split composite high-speed wire production line, and selects the bar mode or the wire mode through the lateral movement of the electric base.

[0013] Specifically, in the bar mode, the channel of the electric base switching device is connected to the bar production line to produce bars with specifications of φ18mm and φ22mm in diameter;

[0014] In the wire mode, the channel of the electric base switching device is connected to the north or south split channel to produce wires with diameters of φ6mm, φ8mm, φ10mm, and φ12mm, including single-wire or double-wire splitting.

[0015] Specifically, the electric base switching device adopts the automatic control of the PLC system. The hardware architecture of the PLC system includes a PLC controller, a signal ET station, a drive system, a PDA signal monitoring system, an HMI operation station, and an industrial Ethernet;

[0016] The sensors of the PLC system are configured to set laser speedometers and hot metal detectors at the splitting stand, steel splitting device, and channel switching point to monitor the position and speed of the rolled piece in real time. A pyrometer is set on the stand, and the data of the pyrometer is collected into the WINCC screen through the PLC controller to see the temperature before entering the next process in real time. Thermocouples are placed in the two stands, the eight stands, and the reducing and sizing mill unit. The thermocouples are installed inside the roll box, and the temperature of the roll box welding point is detected in real time through the Seebeck effect to ensure the normal operation of the rolls;

[0017] The control principle of the PLC system includes speed control, loop control, and micro-tension control.

[0018] Specifically, the switching process between the bar mode and the wire mode is as follows:

[0019] (1) Switching trigger: Input a switching instruction on the operation console, and the PLC system controls the lateral movement of the electric base to switch the channel to connect to the target production line;

[0020] (2) Speed matching: After switching, the system automatically adjusts the speed of the rolling mill.

[0021] Specifically, the splitting in step (3) adopts the design of pass and guide groove systems. The splitting passes are set at the 15# and 16# rolling mill stands of the pre-finishing rolling. The pre-splitting - splitting combined process is adopted. The pre-splitting pass makes the rolled piece form an obvious waist-shaped cross-section, and the splitting pass separates the rolled piece into two wires through the blades;

[0022] The guide groove system is equipped with an independent guide groove for each cutting channel. A trumpet-shaped guide structure is set at the guide groove entrance and an anti-deviation baffle is set at the exit to ensure that the wire can enter the subsequent rack stably after cutting.

[0023] Specifically, the slitting in step 3) adopts a steel splitting device, and a steel splitting conveying curved guide trough is set behind the 18# pre-finishing rolling mill frame. The two split wires are respectively guided into the north line and south line channels through two side-by-side mirrored curved paths.

[0024] Specifically, the north line or south line finishing mill group in step 4) includes 19#-30# rolling mills.

[0025] The present invention has the following beneficial effects:

[0026] The high-speed wire slitting and rolling method designed in the present invention is the first double-wire slitting and rolling technology. Through the slitting hole type and the steel conveying curved guide groove, it can achieve efficient slitting of wires with diameters of φ6mm, φ8mm, φ10mm and φ12mm, thereby improving production capacity and economic benefits. The rod and wire shared channel technology breaks the functional rigidity limitations of the production line, adapts to the market's demand for multiple specifications, and improves equipment utilization by 40%, filling the gap in high-speed wire slitting production, providing the steel industry with a "one machine for multiple uses" composite rolling solution, and promoting the upgrading of green and efficient production technology. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described in detail below. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] A high-speed wire rod slitting and rolling method comprises the following steps:

[0029] 1. Cutting process design.

[0030] (1) Double-line slitting system: The 2# small rod production line is transformed into a double-slitting composite high-speed wire production line. The double-slitting composite high-speed wire production line includes two slitting channels, the north line and the south line, and can simultaneously produce wires with diameters of φ6mm, φ8mm, φ10mm, and φ12mm, or switch to rod production mode.

[0031] (2) Shared channel system: An electric base switching device is set after the No. 2 pre-finishing rolling mill. The electric base switching device connects the 1#-18# rolling mills of the bar production line and the double-slit composite high-speed wire production line. The bar mode or wire mode is selected by the horizontal movement of the electric base.

[0032] Rod mode: The channel of the electric base switching device is connected to the rod production line to produce rods with diameters of φ18mm and φ22mm.

[0033] Wire mode: The channel of the electric base switching device is connected to the north line or south line cutting channel to produce wires with diameters of φ6mm, φ8mm, φ10mm, and φ12mm, including single-line or double-line cutting.

[0034] (3) Design of hole type and guide groove system: The cutting hole type is set on the pre-finishing rolling 15# and 16# rolling mill frames, and the pre-cutting-cutting combined process is adopted. The pre-cutting hole type makes the rolled piece form a clear waist-shaped cross-section, and the cutting hole type separates the rolled piece into two wires through the blade.

[0035] Guide trough system: Each cutting channel is equipped with an independent guide trough. A trumpet-shaped guide structure is set at the guide trough entrance and an anti-deviation baffle is set at the exit to ensure that the wire can enter the subsequent rack stably after cutting.

[0036] (4) Steel separation device: A steel separation conveying curved guide trough is set behind the 18# pre-finishing mill frame. Through two mirror-image curved paths side by side, the two wires after being cut are respectively guided into the north line and south line channels to avoid mutual interference.

[0037] Specific production steps of high-speed wire slitting and rolling method:

[0038] 1. Cutting and rolling process.

[0039] (1) Billet heating: The billet is heated to 1050-1100℃ to maintain rolling plasticity.

[0040] (2) Rough rolling and intermediate rolling: The steel billet is rolled into an intermediate billet with a size of 39mm*70mm through the 1#-9# rolling mills.

[0041] (3) Pre-finishing rolling and slitting: The steel is slit and rolled into two pre-rolled pieces with a diameter of φ24mm through the 13#-18# pre-finishing rolling mill. The slitting composite high-speed wire production line adopts a double-wire slitting system and a shared channel system. A steel separation device is set after the 18# pre-finishing rolling mill.

[0042] (4) Finishing rolling and cooling: The slit wire rods are respectively passed through the north line or south line finishing rolling mill, which includes 19#-30# rolling mills, with a controlled rolling speed of 100-120m / s, and then coiled on the laying machine and cooled on the loose coil air cooling line.

[0043] 2. Rod and line switching process.

[0044] (1) Switching trigger: The operating console inputs the switching command, and the PLC system controls the electric base to move horizontally, switching the channel to connect to the target production line.

[0045] (2) Speed matching: After switching, the system automatically adjusts the mill speed. For example, when switching from the bar mode (speed 15 m / s) to the wire rod mode (speed 100 m / s), the speed is gradually increased through the speed coordinated adjustment algorithm to avoid steel piling or steel pulling.

[0046] The electric base switching device adopts the automatic control of the PLC system. The hardware architecture of the PLC system includes a PLC controller, a signal ET station, a drive system, a PDA signal monitoring system, an HMI operation station, and an industrial Ethernet.

[0047] The sensors of the PLC system are configured to set laser velocimeters and hot metal detectors at the split stand, steel splitting device, and channel switching points to monitor the position and speed of the rolled piece in real time. A pyrometer is set on the stand, and the pyrometer data is collected into the WINCC screen through the PLC controller to see the temperature before entering the next process in real time. Thermocouples are placed in the two stands, eight stands, and the reducing and sizing unit. The thermocouples are installed inside the roll box, and the temperature of the roll box welding point is detected in real time through the Seebeck effect to ensure the normal operation of the rolls.

[0048] The control principles of the PLC system include speed control, loop control, and micro-tension control.

[0049] (1) Speed control: Accurate cascaded speed setting is the basic condition for production. Through head micro-tension control, the online optimization of the rolling schedule is realized. The split high-speed wire is divided into two types in cascaded speed regulation, namely master-slave cascade and single cascade. The master-slave cascade means that there is a distinction between the main line and the slave line during split production, that is, the slave line cannot affect the main line speed, and the single cascade means that normal cascaded speed regulation can be carried out when a certain line is produced alone.

[0050] (2) Loop control principle: The loop plays a key role in the bar and wire rod rolling process, mainly used to detect and adjust the speed relationship between adjacent stands to achieve tension-free rolling. The loop forms an arc by bending the rolled piece between two stands to buffer the change of the second flow rate between the stands, thereby eliminating the tension between the stands and improving the dimensional accuracy of the rolled piece. There are two ways of loop control: loop height control and loop forming roll control. The loop regulator detects the deviation between the actual height of the loop and the set value, generates a speed adjustment signal, and adjusts the speed of the upstream stand to maintain the loop height at the set value to achieve the balance of the second flow rate between the stands.

[0051] (3) Micro-tension control: Through torque compensation for the finishing mill group, micro-tension control of the head of the rolled piece is realized. The compensation is divided into two categories, biting torque compensation and throwing torque compensation, that is, increasing the current during biting and decreasing the current during throwing for torque compensation, and adjusting the current to influence the torque and speed to achieve the same second flow rate.

[0052] 1. Double-split composite high-speed wire rod process: (1) The double-line split rolling technology was pioneered. Through the split pass and the steel dividing and conveying bend chute, the high-efficiency splitting of wire rods with diameters of φ6mm, φ8mm, φ10mm, and φ12mm is realized, and the shift output is increased by 600 - 800 tons.

[0053] (2) The electric base switching device enables the rapid switching of the bar and wire channels within 5 minutes, increasing the annual effective production time by approximately 300 hours.

[0054] 2. Continuous rolling system automatic control: (1) Based on the cascade control algorithm of PLC, the speed joint adjustment error under different production modes is ≤ ±0.05m / s, improving the product size accuracy (±0.1mm) and the qualification rate (≥98%).

[0055] (2) The HMI operation station integrates functions such as real-time monitoring of production data, automatic distribution of process parameters, and self-diagnosis of faults, reducing manual intervention.

[0056] 3. Energy-saving process design: The double-split process reduces the number of rolling stands, the power consumption per ton of steel is reduced by 20 - 30 kWh, and the annual electricity cost savings is 14.9624 million yuan. The economic benefits are remarkable: After the transformation, the annual production capacity of the high-speed wire rod is increased to 1.268 million tons, and the annualized benefit reaches 75.8264 million yuan (including the profit of spiral bars and energy-saving benefits). Breakthrough in production flexibility: The bar and wire common channel technology breaks the limitation of the fixed function of the production line, adapts to the multi-specification requirements of the market, and the equipment utilization rate is increased by 40%.

[0057] The present invention is not limited to the above embodiments. Anyone should know that structural changes made under the inspiration of the present invention, as long as they have the same or similar technical solutions as the present invention, fall within the protection scope of the present invention.

[0058] The technologies, shapes, and structures not described in detail in the present invention are all well-known technologies.

Claims

1. A high-speed wire rod split rolling method, characterized in that It includes the following steps: 1) Blank heating: The steel billet is heated to 1050 - 1100 °C to maintain rolling plasticity. 2) Rough rolling and intermediate rolling: The steel billet is rolled into an intermediate billet by 1# - 9# rolling mills. 3) Pre-finishing rolling and splitting: After passing through 13# - 18# pre-finishing rolling mills, it is split and rolled into two pre-rolled pieces with a diameter of φ24 mm. The splitting composite high-speed wire production line adopts a double-line splitting system and a common channel system. The double-line splitting system is to transform the 2# small bar production line into a double-splitting composite high-speed wire production line. The double-splitting composite high-speed wire production line includes two splitting channels, the north line and the south line. A steel splitting device is set after the 18# pre-finishing rolling mill. 4) Finishing rolling and cooling: The split wire rods respectively pass through the north line or south line finishing rolling mills, the rolling speed is controlled at 100 - 120 m / s, and then they are coiled by a laying head and cooled by a loose coil air cooling line.

2. The high-speed wire rod split rolling method according to claim 1, characterized in that, The size of the intermediate billet in step 2) is 39 mm * 70 mm.

3. The high-speed wire rod split rolling method according to claim 1, characterized in that The common channel system in step 3) is to set an electric base switching device after the 2# pre-finishing rolling. The electric base switching device connects the 1# - 18# rolling mills of the bar production line and the double-splitting composite high-speed wire production line, and selects the bar mode or the wire mode through the lateral movement of the electric base.

4. The high-speed wire rod split rolling method according to claim 3, characterized in that The bar mode means that the channel of the electric base switching device connects the bar production line to produce bar products with specifications of diameter φ18 mm and diameter φ22 mm. The wire mode means that the channel of the electric base switching device connects the north line or south line splitting channel to produce wire products with diameters of φ6 mm, φ8 mm, φ10 mm, and φ12 mm, including single-line or double-line splitting.

5. The high-speed wire rod split rolling method according to claim 3, characterized in that The electric base switching device adopts the automatic control of the PLC system. The hardware architecture of the PLC system includes a PLC controller, a signal ET station, a drive system, a PDA signal monitoring system, an HMI operation station, and an industrial Ethernet. The sensors of the PLC system are configured to set laser speedometers and hot metal detectors at the splitting stands, steel splitting devices, and channel switching points to monitor the position and speed of the rolled piece in real time. A pyrometer is set on the stands, and the data of the pyrometer is collected into the WINCC screen through the PLC controller to see the temperature before entering the next process in real time. Thermocouples are placed in the two stands, eight stands, and the reducing and sizing units. The thermocouples are installed inside the roll boxes to detect the temperature of the roll box welding points in real time through the Seebeck effect to ensure the normal operation of the rolls. The control principle of the PLC system includes speed control, loop control, and micro-tension control.

6. The high-speed wire rod split rolling method according to claim 5, characterized in that, The switching process between the bar mode and the wire mode is as follows: (1) Switching trigger: The operator inputs a switching instruction on the console, and the PLC system controls the lateral movement of the electric base to switch the channel to connect the target production line. (2) Speed matching: After switching, the system automatically adjusts the rolling mill speed.

7. The high-speed wire rod split rolling method according to claim 1, characterized in that, The splitting in step 3) adopts the design of pass and guide groove system. The splitting passes are set at the 15# and 16# stands of the pre-finishing rolling. The pre-splitting - splitting combined process is adopted. The pre-splitting pass makes the rolled piece form an obvious waist-shaped cross-section, and the splitting pass separates the rolled piece into two wire rods through the blades. The guide groove system is equipped with an independent guide groove for each cutting channel. A trumpet-shaped guide structure is set at the guide groove entrance and an anti-deviation baffle is set at the exit to ensure that the wire can enter the subsequent rack stably after cutting.

8. The high-speed wire rod split rolling method according to claim 1, characterized in that, The slitting in step 3) adopts a steel dividing device, and a steel conveying curved guide groove is set behind the 18# pre-finishing rolling mill frame. The two divided wires are respectively introduced into the north line and south line channels through two side-by-side mirrored curved channels.

9. The high-speed wire rod split rolling method according to claim 1, characterized in that, The north line or south line finishing mill group in step 4) includes 19#-30# rolling mills.