A precise control method for the tapping time of aluminum ingots in a 1+4 thermite continuous rolling process

Abstract

A precise control method for the tapping time of aluminum ingots in a 1+4 thermomechanical continuous rolling process. A tapping time control module for aluminum ingots is set in the 1+4 thermomechanical continuous rolling control system. The tapping time control module automatically calculates the tapping time of the next aluminum ingot to be rolled based on the actual rolling process parameters of the aluminum ingot, equipment parameters, and empirical data stored in the control system database, enabling seamless connection and rolling of the front and rear aluminum ingots on the 1+4 thermomechanical continuous rolling production line, eliminating the standby time of the 1+4 thermomechanical continuous rolling production unit, and maximizing the efficiency of the 1+4 thermomechanical continuous rolling production unit. Additionally, after the implementation of this technical solution, the time from the tapping of the next aluminum ingot to the start of rolling can also be precisely controlled, and the temperature drop of the aluminum ingot from tapping to the start of rolling can also be accurately predicted. By back-calculating, the tapping temperature of the aluminum ingot can also be accurately controlled, thus solving the problem of high energy consumption caused by deliberately increasing the tapping temperature of the aluminum ingot to avoid a low temperature of the aluminum ingot at the start of rolling in the past.

Description

Technical Field

[0001] The present invention relates to the technical field of automatic control for 1+4 thermomechanical continuous rolling of aluminum ingots, and particularly relates to a method for precisely controlling the tapping time of aluminum ingots in 1+4 thermomechanical continuous rolling of aluminum ingots. Background Art

[0002] The 1+4 thermomechanical continuous rolling production line for aluminum ingots has the advantages of large weight and length of processed aluminum ingots, high production efficiency, good product quality, and low energy consumption. Therefore, it has been gradually widely used in the production of aluminum strip rolling. During the production of the previous aluminum ingot in the existing 1+4 thermomechanical continuous rolling process, the main operator will judge and send out the tapping signal for the next aluminum ingot to be rolled according to the actual production situation on site and operation experience. When the main operator lacks experience or makes a misjudgment, the problem of the tapping time of the next aluminum ingot to be rolled being too early or too late often occurs. When the tapping time of the next aluminum ingot to be rolled is too early, the waiting time of the next aluminum ingot to be rolled in the atmospheric environment will be too long, resulting in a decrease in the temperature of the aluminum ingot to be rolled, and even lower than the optimal rolling start temperature, affecting the quality of the rolled aluminum strip or even causing scrapping, bringing huge economic losses to the enterprise. To avoid this problem, the main operator usually conservatively raises the tapping temperature of the next aluminum ingot to be rolled and delays the tapping time of the next aluminum ingot to be rolled, but this will bring the problem of increased energy consumption. At the same time, when the tapping time of the next aluminum ingot to be rolled is too late, it will cause the standby time of the 1+4 thermomechanical continuous rolling production unit to be too long, reducing the production efficiency of the equipment, thus affecting the economic benefits of the enterprise. Therefore, reducing the dependence of the tapping time of 1+4 thermomechanical continuous rolling aluminum ingots on the operator's experience and realizing the precise control of the tapping time of 1+4 thermomechanical continuous rolling aluminum ingots have very important practical significance for reducing the economic losses of the enterprise and improving the economic benefits of the enterprise. Summary of the Invention

[0003] In order to overcome the deficiencies in the background art, the present invention discloses a method for precisely controlling the tapping time of 1+4 thermomechanical continuous rolling aluminum ingots. An aluminum ingot tapping time control module is set in the 1+4 thermomechanical continuous rolling control system. The aluminum ingot tapping time control module automatically calculates the tapping time of the next aluminum ingot to be rolled according to the actual rolling process parameters of the aluminum ingot, equipment parameters, and empirical data stored in the control system database, so as to realize the precise control of the tapping time of 1+4 thermomechanical continuous rolling aluminum ingots.

[0004] To achieve the above-mentioned invention objective, the present invention adopts the following technical solution: A method for precisely controlling the tapping time of aluminum ingots in a 1+4 hot aluminum continuous rolling process. The 1+4 hot aluminum continuous rolling production line includes a reversible roughing mill, a shearing machine, a 4-stand continuous rolling mill, a vertical pusher furnace, an ingot turning machine, roller tables, and a control system. The reversible roughing mill, shearing machine, 4-stand continuous rolling mill, vertical pusher furnace, ingot turning machine, and roller tables are electrically connected to the control system. By setting an aluminum ingot tapping time control module in the 1+4 hot aluminum continuous rolling control system, during the process of rolling the previous aluminum ingot in the 1+4 hot aluminum continuous rolling process, the tapping time of the next aluminum ingot to be rolled is precisely calculated and controlled. The control system of the existing 1+4 hot aluminum continuous rolling production line adopts a high-performance computer + multi-PLC control architecture for its hardware platform, which has powerful computing capabilities. Its software platform adopts a multi-level automation control architecture, including a drive control level (L0), a basic automation level (L1), a process automation level (L2), a production management level (L3), and a database. The control system has perfect data acquisition, control, and process adjustment functions among the various devices of the 1+4 hot aluminum continuous rolling production line. At the same time, equipment parameters, process expert systems, etc. are integrated in the software platform. After actually giving the process parameters of the aluminum ingot to be processed, combined with the equipment parameters and relevant data stored in the database, according to the principle that the total volume remains unchanged during the metal rolling process, the processing time of the aluminum ingot to be processed can be accurately calculated. However, the control system of the existing 1+4 hot aluminum continuous rolling production line does not have a function for calculating the processing time of the aluminum ingot to be processed. In the technical solution of the present invention, an aluminum ingot tapping time control module is added to the basic automation level (L1) of the control system software platform. By using this functional module, the total processing time of the previous aluminum ingot on the 1+4 hot aluminum continuous rolling production line is predicted and calculated, so as to achieve precise control of the tapping time of the next aluminum ingot to be rolled during the 1+4 hot aluminum continuous rolling production process.

[0005] Further, the formula for the aluminum ingot tapping time control module to calculate the tapping time of the next aluminum ingot to be rolled is:

[0006] T = T1 - T2

[0007] Where: T is the tapping time of the next aluminum ingot to be rolled; T1 is the time required for the previous aluminum ingot to be bitten in the first pass until the tail of the shearing tail pass leaves the shearing machine; T2 is the time required from the moment the vertical pusher furnace receives the tapping instruction for the next aluminum ingot until the next aluminum ingot is on the tilting machine and is ready to be lowered, which is obtained through the equipment parameter file; the actual meaning of this formula is: during the rolling process of the previous aluminum ingot, that is, the tapping signal of the next aluminum ingot is sent in advance, and when the previous aluminum ingot is rolled, the next aluminum ingot synchronously completes tapping and is ready to be flipped onto the roller table on the tilting machine, realizing seamless connection rolling of two adjacent aluminum ingots on the 1+4 hot aluminum continuous rolling production line, eliminating the standby time of the 1+4 hot aluminum continuous rolling production unit, and maximizing the efficiency of the 1+4 hot aluminum continuous rolling production unit; in addition, after the implementation of this technical solution, the time from the tapping of the next aluminum ingot to the start of rolling can also be accurately controlled, and the temperature drop of the aluminum ingot from tapping to the start of rolling can also be accurately predicted, and by reverse deduction, the tapping temperature of the aluminum ingot can also be accurately controlled, thus solving the problem of high energy consumption caused by deliberately increasing the tapping temperature of the aluminum ingot to avoid low temperature of the aluminum ingot at the start of rolling in the past.

[0008] Further, the calculation mathematical model of T1 is:

[0009] T1 = tRollingSum + tTranSum + tPauseSum;

[0010]

[0011]

[0012]

[0013]

[0014]

[0015] Where: tRollingSum is the total rolling time of the rolling mill during the process of the previous aluminum ingot being bitten in the first pass until the tail of the shearing tail pass leaves the shearing machine;

[0016] tTranSum is the total transportation time on the roller table during the process of the previous aluminum ingot being bitten in the first pass until the tail of the shearing tail pass leaves the shearing machine;

[0017] tPauseSum is the total pause time between passes during the process of the previous aluminum ingot being bitten in the first pass until the shearing pass;

[0018] tRolling pNo is the rolling time of the previous aluminum ingot before the shearing pass;

[0019] tTran pNois the transportation time of the previous ingot before the shearing pass;

[0020] tPause is the pause time between passes of the previous ingot, obtained from the process parameter file;

[0021] pNo is the pass number of the shearing pass of the previous ingot, obtained from the database;

[0022] lEast is the transportation distance of the previous ingot on the left side of the rolling mill, obtained from the equipment parameter file;

[0023] lWeast is the transportation distance of the previous ingot on the right side of the rolling mill, obtained from the equipment parameter file;

[0024] lFur is the distance between the vertical pusher furnace and the rough rolling mill, obtained from the equipment parameter file;

[0025] fNo is the number of the vertical pusher furnace, obtained from the database;

[0026] lEntry is the entry length of the previous ingot for each pass, obtained from the database;

[0027] vRoll is the linear speed of the roll, obtained from the database;

[0028] vIn is the biting speed of the roll, obtained from the database;

[0029] vOut is the tail-throwing speed of the roll, obtained from the database;

[0030] FS is the forward slip value, obtained from the database;

[0031] BS is the backward slip value, obtained from the database.

[0032] Furthermore, the ingot discharging time control module starts timing from the moment when the previous ingot is bitten in the first pass as feedback from the reversible rough rolling mill. When the timing reaches T, the ingot discharging time control module issues an instruction to the vertical pusher furnace to discharge the next ingot to be rolled. Exactly within the allowable error range of + / - 2 seconds of T2, the next ingot to be rolled is just positioned on the turning machine and is ready to be placed on the connecting roller table, and the turning machine transmits the in-position signal to the ingot discharging time control module.

[0033] Furthermore, when the tail of the previous ingot leaves the shearing machine at the last shearing pass, a signal is sent to the ingot discharging time control module, and the ingot discharging time control module immediately issues a control instruction to the turning machine (at this time, the ingot discharging time control module has received the in-position signal from the turning machine), completing the positioning of the next ingot to be rolled on the 1+4 hot aluminum continuous rolling production line, realizing seamless connection and rolling of the front and rear ingots on the 1+4 hot aluminum continuous rolling production line.

[0034] Due to the adoption of the technical solution as described above, the present invention has the following beneficial effects: A precise control method for the ingot discharging time in 1+4 hot aluminum continuous rolling disclosed by the present invention sets an ingot discharging time control module in the 1+4 hot aluminum continuous rolling control system. The ingot discharging time control module automatically calculates the discharging time of the next ingot to be rolled according to the actual rolling process parameters setting of the ingot, equipment parameters, and empirical data stored in the control system database, precisely controls the ingot discharging time in 1+4 hot aluminum continuous rolling, enables seamless connection and rolling of the front and rear ingots on the 1+4 hot aluminum continuous rolling production line, eliminates the standby time of the 1+4 hot aluminum continuous rolling production unit, and realizes the maximization of the efficiency of the 1+4 hot aluminum continuous rolling production unit; in addition, after the implementation of this technical solution, the time from the discharging of the next ingot to the start of rolling can also be precisely controlled, and the temperature drop of the ingot from discharging to the start of rolling can also be accurately predicted. By reverse deduction, the discharging temperature of the ingot can also be accurately controlled, thus solving the problem of high energy consumption caused by deliberately increasing the ingot discharging temperature to avoid low ingot temperature during rolling in the past. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic flow chart of a precise control method for the ingot discharging time in 1+4 hot aluminum continuous rolling. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0037] A precise control method for the ingot discharging time in 1+4 hot aluminum continuous rolling. The 1+4 hot aluminum continuous rolling production line includes a reversible roughing mill, a shearing machine, a 4-stand continuous rolling mill, a vertical pusher furnace, a turning machine, roller tables, and a control system. The reversible roughing mill, the shearing machine, the 4-stand continuous rolling mill, the vertical pusher furnace, the turning machine, and the roller tables are electrically connected to the control system; an ingot discharging time control module is set in the 1+4 hot aluminum continuous rolling control system. This module is set in the basic automation level (L1) of the 1+4 hot aluminum continuous rolling control system software platform, and during the production of 1+4 hot aluminum continuous rolling, during the rolling production process of the previous ingot, it calculates and controls the discharging time of the next ingot to be rolled;

[0038] The formula for calculating the discharging time of the next ingot to be rolled is:

[0039] T = T1 - T2

[0040] Where: T is the discharging time of the next ingot to be rolled; T1 is the time required from the first pass bite of the previous ingot to the tail of the shearing tail pass leaving the shearing machine; T2 is the time required from the vertical pusher furnace receiving the discharging instruction of the next ingot to the next ingot being on the turning machine and meeting the dropping condition, which is obtained through the equipment parameter file;

[0041] The calculation mathematical model of T1 is as follows:

[0042] T1 = tRollingSum + tTranSum + tPauseSum.

[0043]

[0044]

[0045]

[0046]

[0047]

[0048] Among them: tRollingSum is the total rolling time of the rolling mill during the process from the first pass bite of the previous ingot to the tail of the shearing pass leaving the shearing machine;

[0049] tTranSum is the total transportation time on the roller table during the process from the first pass bite of the previous ingot to the tail of the shearing pass leaving the shearing machine;

[0050] tPauseSum is the total pause time between passes from the first pass bite of the previous ingot to the shearing pass;

[0051] tRolling pNo is the rolling time of the previous ingot in the shearing pass;

[0052] tTran pNo is the transportation time of the previous ingot in the shearing pass;

[0053] tPause is the pause time between passes of the previous ingot, obtained through the process parameter file;

[0054] pNo is the pass number of the previous ingot in the shearing pass, obtained through the database;

[0055] lEast is the transportation distance of the previous ingot on the left side of the rolling mill, obtained through the equipment parameter file;

[0056] lWeast is the transportation distance of the previous ingot on the right side of the rolling mill, obtained through the equipment parameter file;

[0057] lFur is the distance between the vertical pusher furnace and the rough rolling mill, obtained through the equipment parameter file;

[0058] fNo is the vertical pusher furnace number, obtained through the database;

[0059] lEntry is the entrance length of the previous ingot in each pass, obtained through the database;

[0060] vRoll is the linear speed of the roll, obtained through the database;

[0061] vIn is the biting speed of the roll, obtained through the database;

[0062] vOut is the tail - throwing speed of the roll, obtained through the database;

[0063] FS is the forward - slip value, obtained through the database;

[0064] BS is the backward - slip value, obtained through the database;

[0065] The specific control method for the tapping time of the ingot in the 1 + 4 thermite continuous rolling is as follows:

[0066] After the processing - technology parameters of the previous ingot are input into the control system, the ingot - tapping - time control module calculates the tapping time T of the next ingot to be rolled according to the formula T = T1 - T2; when the first - pass biting signal of the previous ingot fed back by the reversible roughing mill reaches the ingot - tapping - time control module, the timing starts; when the timing reaches T, the ingot - tapping - time control module issues an instruction to the vertical pusher furnace to make the next ingot to be rolled out of the furnace; within the allowable error range of + / - 2 seconds of time T2, the next ingot to be rolled is exactly positioned on the turning machine and is ready to be placed on the connecting roller table, and the turning machine transmits the in - position signal to the ingot - tapping - time control module; when the tail of the previous ingot leaves the shearing machine at the last shearing pass, a signal is sent to the ingot - tapping - time control module, and the ingot - tapping - time control module immediately issues a control instruction to the turning machine to complete the positioning of the next ingot to be rolled on the roller table of the 1 + 4 thermite continuous - rolling production line, and then the 1 + 4 thermite continuous rolling of the next ingot is carried out.

[0067] The implementation of the precise control method for the tapping time of the ingot in the 1 + 4 thermite continuous rolling of the present invention shortens the production - connection time between the original two - ingot rolling productions in the 1 + 4 thermite continuous rolling from several minutes or more than ten minutes to the second - level, greatly improves the production efficiency of the 1 + 4 thermite continuous - rolling production unit, reduces the production energy consumption, and brings good economic benefits to the enterprise.

[0068] When the first ingot is rolled in the 1 + 4 thermite continuous rolling, due to the low temperature of the roller table and each roll, the tapping temperature of the first ingot is controlled within the range of 0.9 alloy solidus temperature, and the temperature difference is controlled within + / - 5°; when rolling the second ingot, the tapping temperature of the ingot is controlled within the range of 0.7 alloy phase - line temperature, and the temperature difference is controlled within + / - 5°.

[0069] The parts not detailed in the present invention are the prior art.

Claims

1. A method for precisely controlling the tapping time of aluminum ingots in a 1+4 thermomechanical continuous rolling process. The 1+4 thermomechanical continuous rolling production line includes a reversible roughing mill, a shearing machine, a 4-stand continuous rolling mill, a vertical pusher furnace, an ingot turning machine, roller tables, and a control system. The reversible roughing mill, the shearing machine, the 4-stand continuous rolling mill, the vertical pusher furnace, the ingot turning machine, the roller tables are electrically connected to the control system; characterized in that: at In the 1+4 hot metal thermomechanical continuous rolling control system, there is an ingot discharging time control module, which is used to accurately control the discharging time of the next ingot to be rolled during the rolling production of the previous ingot in the 1+4 hot metal thermomechanical continuous rolling: The formula for the ingot discharging time control module to calculate the discharging time of the next ingot to be rolled is: T = T1 - T2 Where: T is the discharging time of the next ingot to be rolled; T1 is the time required from the first pass bite of the previous ingot to the tail of the shearing tail pass leaving the shearing machine; T2 is the time required from the vertical pusher furnace receiving the discharging instruction of the next ingot to the next ingot being on the turning machine and having the condition to be put down, which is obtained through the equipment parameter file; The calculation mathematical model of T1 is: T1 = tRollingSum + tTranSum + tPauseSum; Where: tRollingSum is the total rolling time of the rolling mill during the process of the previous ingot from the first pass bite to the tail of the shearing tail pass leaving the shearing machine; tTranSum is the total transportation time on the roller table during the process of the previous ingot from the first pass bite to the tail of the shearing tail pass leaving the shearing machine; tPauseSum is the total pause time between passes of the previous ingot from the first pass bite to the shearing pass; tRolling pNo is the rolling time of the previous ingot before the shearing pass; tTran pNo is the transportation time of the previous aluminum ingot before the shearing pass; tPause is the pause time between passes of the previous ingot, which is obtained through the process parameter file; pNo is the pass number of the shearing pass of the previous ingot, which is obtained through the database; lEast is the transportation distance of the previous ingot on the left side of the rolling mill, which is obtained through the equipment parameter file; lWeast is the transportation distance of the previous ingot on the right side of the rolling mill, which is obtained through the equipment parameter file; lFur is the distance between the vertical pusher furnace and the rough rolling mill, which is obtained through the equipment parameter file; fNo is the number of the vertical pusher furnace, which is obtained through the database; lEntry is the entrance length of each pass of the previous ingot, which is obtained through the database; vRoll is the linear speed of the roll, which is obtained through the database; vIn is the bite speed of the roll, which is obtained through the database; vOut is the tail throw speed of the roll, which is obtained through the database; FS is the forward slip value, which is obtained through the database; BS is the backward slip value, which is obtained through the database.

2. The precise control method for the tapping time of aluminum ingots in the 1+4 hot aluminum tandem rolling according to claim 1, characterized in that: The ingot discharging time control module starts timing from the first pass bite of the previous ingot fed back by the reversible rough rolling mill. When the cumulative timing reaches time T, the ingot discharging time control module issues an instruction to the vertical pusher furnace to discharge the next ingot to be rolled; within the allowable error range of time T2, the next ingot to be rolled is exactly located on the turning machine and has the condition to be placed on the connecting roller table, and the turning machine transmits the in-position signal to the ingot discharging time control module.

3. The method for precisely controlling the tapping time of aluminum ingots in a 1+4 hot aluminum tandem rolling mill according to claim 2, characterized in that: When the tail of the shearing tail pass of the previous ingot leaves the shearing machine, a feedback signal is sent to the ingot discharging time control module, and the ingot discharging time control module immediately issues a control instruction to the turning machine to complete the in-position of the next ingot to be rolled on the roller table of the 1+4 hot metal thermomechanical continuous rolling production line.

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