TW202031380A - Temperature control method for hot rolling process of aluminum coil - Google Patents

Abstract

A temperature control method for a hot rolling process of an aluminum coil is described. In this method, in a hot rolling process of an aluminum coil, a first calculation step is performed to calculate a difference between an actual finishing temperature and a goal finishing temperature of an aluminum slab at a first time step. A second calculation step is performed by using the difference to calculate a spray amount of cooling water which corresponds to the first time step. A spraying cooling treatment is performed on the aluminum slab based on the spray amount of cooling water.

Description

Temperature control method of aluminum coil hot rolling process

The present invention relates to a hot rolling technology of aluminum coils, and particularly relates to a temperature control method of the hot rolling process of aluminum coils.

At present, in the hot rolling process of aluminum coil, the water feedback control system between the stations of the finishing temperature adopts the method of accumulating the error between the actual measured value of the finishing temperature and the target value. This water feedback control method is based on the total error of the previously accumulated finishing delivery temperature (FDT) of the previous time step of the program control system grabbing the aluminum blank, plus the finishing delivery temperature of the current time step. The error between the measured temperature and the target value is used as the total temperature error of the current time step, and the total temperature error of the current time step is used to determine the amount of cooling water sprayed between stations, and the determined cooling water between stations The amount of sprayed water is sent to the control system for spraying.

However, this kind of water feedback control method has poor temperature control accuracy for aluminum material. Please refer to Fig. 1, which is a graph showing an aluminum coil finishing temperature curve using a traditional water control mode. When the rolling target is a low finishing temperature of 270°C, the control mode that accumulates errors easily causes excessive water flow between stations. If the cooling water decreases too slowly, the temperature of the aluminum material is too low. Not only has the temperature of the infrared thermometer reached the lower limit of 250℃, the actual temperature of the aluminum material is even lower than 250℃. As a result, the motor load of the hot rolling mill may be excessive, and there is a risk of the hot rolling mill tripping.

Therefore, one object of the present invention is to provide a temperature control method for the hot rolling process of aluminum coils, which can improve the control accuracy of the aluminum coil finishing temperature, so as to avoid the phenomenon of aluminum material temperature supercooling, and effectively reduce the hot rolling The risk of machine tripping can in turn increase the yield of the aluminum coil hot rolling process.

According to the above objective of the present invention, a temperature control method for the hot rolling process of aluminum coil is proposed. In this method, during the hot rolling process of the aluminum billet, a first calculation step is performed to calculate the error between the measured value of the aluminum billet's finishing temperature at the first time step and the target value. Using this error, a second calculation step is performed to calculate the cooling water spray volume value corresponding to the first time step. According to the numerical value of the cooling water spray amount, the aluminum blank is sprayed and cooled.

According to an embodiment of the present invention, when performing the first calculation step, the target value is subtracted from the actual measured value of the finishing temperature.

According to an embodiment of the present invention, the above-mentioned second calculation step includes using a formula which is numerical value of cooling water spray amount=error/heat conductivity coefficient of aluminum blank*gain, where the gain depends on aluminum The aluminum type, width, and thickness of the blank.

According to an embodiment of the present invention, the foregoing cooling water spray cooling treatment on the aluminum blank according to the cooling water spray amount value includes the cooling water spray amount The value is sent to a control system, and the water spray cooling process is controlled through this control system.

According to an embodiment of the present invention, the above-mentioned aluminum billet is in the finishing rolling process of the hot rolling process.

According to an embodiment of the present invention, at the second time step after the first time step, the temperature control method of the aluminum coil hot rolling process further includes repeating the first calculation step, the second calculation step, And spray water cooling treatment.

According to an embodiment of the present invention, the first time step and the second time step are separated by about 100 ms.

The embodiment of the present invention adopts the method of controlling the finish rolling temperature by water feedback, and adopts no accumulation mode for the error between the actual measured value of the finish rolling temperature and the target value. In this way, the amount of cooling water sprayed between stations corresponding to the current time step can be determined according to the error between the actual measured value of the rolling temperature at the current time step and the target value, and the phenomenon of aluminum overcooling can be avoided , Thereby avoiding the risk of motor tripping of the hot rolling mill.

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In order to make the above and other objectives, features, advantages and embodiments of the present invention more comprehensible, the description of the accompanying drawings is as follows: [Figure 1] is a drawing of an aluminum coil finishing temperature curve using a traditional water control mode Figure; [Fig. 2] is a flow chart showing a temperature control method of an aluminum coil hot rolling process according to an embodiment of the present invention; and [Fig. 3] is a diagram showing a method for utilizing aluminum coil heat according to an embodiment of the present invention The temperature curve diagram of the aluminum coil finish rolling of the temperature control method of the rolling process.

In view of the fact that the conventional technology has poor accuracy in controlling the temperature of the aluminum material by the water feedback control method for the finished temperature of the aluminum coil hot rolling process, it is easy to produce the phenomenon of supercooling of the aluminum coil finishing temperature, so the present invention proposes an aluminum The temperature control method of the coil hot rolling process changes the water feedback control logic between the rolling stations in the aluminum coil hot rolling process. The error between the measured value of the finished rolling temperature and the target value no longer accumulates the error of the previous time step. This can determine the amount of cooling water spraying corresponding to the next time step according to the error between the actual measured value of the current rolling temperature and the target value, and can slow down the phenomenon of aluminum supercooling, thereby avoiding the motor jump of the hot rolling mill Machine risk.

Please refer to FIG. 2, which shows a flow chart of a temperature control method of an aluminum coil hot rolling process according to an embodiment of the present invention. The temperature control method of the aluminum coil hot rolling process is applied in the hot rolling process of the aluminum billet, such as the finishing rolling process of the hot rolling process. In addition, this temperature control method can be applied to aluminum coils with low finishing temperature. In some embodiments, when performing this temperature control method, operation 100 may be performed first to perform the first calculation step during the finishing rolling process of the hot rolling process on the aluminum blank to calculate the aluminum blank in a hot rolling station After that, the error between the measured value of the finishing temperature and the target value of the first time step. Carry on In a calculation step, the target value can be subtracted from the actual measured value of the finish rolling temperature of the aluminum blank at this first time step.

Generally speaking, the production and sales management system level of a steel plant can include Level 0~Level 4. Level 1~Level 4 are information systems. Among them, Level 1 is configured as a process control information system, which can monitor or control one or more processes, and can be connected with field equipment machines in wired or wireless manner to drive production equipment machines, and Process information can be obtained from the equipment machine. The Level 2 system is configured as an information system for production line control, which can integrate a production line or multiple processes in a production line for monitoring process control or automated information processing. Level 2 can be connected with Level 1 signal, and can implement automatic control of production equipment through Level 1. In some demonstrative examples, a Level 2 programming system can be used to perform the first calculation step.

After obtaining the error between the measured value of the aluminum billet finishing temperature at the first time step and the target value, operation 110 can be performed to use the error calculated by the Level 2 program control system to perform the second calculation step. Calculate the cooling water spray volume value between the two hot rolling stations corresponding to this first time step. For example, the two hot rolling stations are both finishing rolling stations in the hot rolling process. In some demonstration examples, a formula can be used to perform the second calculation step. The formula is the amount of cooling water spray = error/heat transfer coefficient of aluminum blank * gain value, where the gain value depends on the aluminum type, width, and And thickness. In other words, there is a corresponding gain value for the aluminum type, width, and thickness of each aluminum blank.

This embodiment uses the error between the measured value of the finished rolling temperature of the aluminum blank at the current time step and the target value to calculate the time corresponding to the current time. The numerical value of the cooling water spray amount in the interval is not the total temperature error, that is, the calculated error is no longer added to the temperature error accumulated in the previous time step. In this way, the amount of cooling water sprayed between stations corresponding to the current time step can be determined based on the error between the actual measured value of the rolling temperature at the current time step and the target value, thereby reducing the degree of temperature control error and avoiding cooling If the amount of water is too large, the aluminum material can be prevented from being too cold, and the motor of the hot rolling mill can be prevented from tripping.

After calculating the cooling water spray quantity value of this first time step, operation 120 can be performed to perform water spray cooling treatment on the aluminum blank according to the calculated cooling water spray quantity value. In some exemplary examples, when performing operation 120, the value of the cooling water spray amount can be sent to the Level 1 control system, and then the spray cooling process can be controlled through this control system.

In some examples, after the aluminum blank is cooled by spraying water between the stations in the first time step, the temperature control method can repeat the first calculation step and the second step in the second time step. Two calculation steps, and water spray cooling treatment. That is, calculate the error between the measured value of the finished rolling temperature of the aluminum blank at the second time step and the target value, and use the calculated error to calculate the cooling water spray amount between stations corresponding to the second time step According to the numerical value and the calculated cooling water spray amount value, the aluminum blank is sprayed and cooled. In some exemplary examples, the first time step and the second time step are separated by about 100 ms.

Please refer to FIG. 3, which is a graph showing a temperature control method of aluminum coil hot rolling according to an embodiment of the present invention. It can be seen from FIG. 2 that after the temperature control method of the embodiment of the present invention is used to control the rolling temperature of the aluminum coil hot rolling process, the aluminum coil is not overcooled phenomenon. It can be seen that the control mode of the method of the present invention can reduce the degree of temperature control error, can make the control of the finished rolling temperature of the aluminum coil more accurate, and can avoid the overload of the rolling mill, thereby avoiding the rolling mill to skip.

It can be seen from the above-mentioned embodiments that one of the advantages of the present invention is that the embodiment of the present invention adopts the method of controlling the finish rolling temperature by water feedback, and adopts no accumulation mode for the error between the actual measured value of the finish rolling temperature and the target value. In this way, the amount of cooling water sprayed between stations corresponding to the current time step can be determined according to the error between the actual measured value of the rolling temperature at the current time step and the target value, and the phenomenon of aluminum overcooling can be avoided , Thereby avoiding the risk of motor tripping of the hot rolling mill.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in this technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to those defined by the attached patent application scope.

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Claims (7)

A temperature control method for an aluminum coil hot rolling process, comprising: performing a first calculation step during a hot rolling process of an aluminum blank to calculate the actual measurement of the rolling temperature of the aluminum blank at a first time step An error between the value and a target value; using the error, perform a second calculation step to calculate a cooling water spray amount value corresponding to the first time step; and the cooling water spray amount value to the The aluminum blank undergoes a water spray cooling treatment. For example, the temperature control method of the aluminum coil hot rolling process in the scope of the patent application, wherein the first calculation step is performed by subtracting the target value from the measured value of the finished rolling temperature. For example, the temperature control method of the aluminum coil hot rolling process in the scope of the patent application, wherein the second calculation step includes the use of a formula, the formula is the cooling water spray amount value = the error / a thermal conductivity coefficient of the aluminum blank * A gain value, where the gain value depends on the aluminum type, width, and thickness of the aluminum blank. For example, the temperature control method of the aluminum coil hot rolling process in the first item of the scope of patent application, wherein performing the water spray cooling treatment on the aluminum blank according to the cooling water spray amount value includes sending the cooling water spray amount value to a control system, And through the control system to control the water spray cooling process. For example, the temperature control method of the aluminum coil hot rolling process of the first item in the scope of the patent application, wherein the aluminum billet is in a finishing rolling process of the hot rolling process. For example, the temperature control method of the aluminum coil hot rolling process in the scope of the patent application, in a second time step after the first time step, further includes repeating the first calculation step and the second time step in sequence. Calculation steps, and the water spray cooling treatment. For example, the temperature control method of the aluminum coil hot rolling process in the scope of patent application, wherein the first time step and the second time step are separated by 100 ms.

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