A Data Feedback-Based Optimization Control Method for Isothermal Extrusion of Aluminum Alloys

Abstract

This invention discloses an isothermal extrusion method for aluminum alloys based on data feedback optimization control, belonging to the field of metal material processing technology. The method includes: Step 1, extruding an aluminum alloy rod at a preset initial temperature and a preset initial extrusion speed; Step 2, acquiring the extrusion exit temperature of the aluminum alloy rod in real time, and determining in real time whether the extrusion exit temperature is not less than a preset maximum temperature. If so, adjusting the extrusion speed in real time using a preset control equation until the current aluminum alloy rod extrusion is completed; Step 3, acquiring the function of the extrusion speed changing with time during the current aluminum alloy rod extrusion process, and correcting the function to obtain the corrected speed for extruding the next aluminum alloy rod; Step 4, if further extrusion is needed, extruding the next aluminum alloy rod at a preset initial temperature and corrected speed, and returning to Step 2 for repeated execution. This invention can significantly improve the efficiency and quality of aluminum alloy extrusion forming.

Description

Technical Field

[0001] This invention relates to the field of metal material processing technology, and in particular to an isothermal extrusion method for aluminum alloys based on data feedback optimization control. Background Technology

[0002] Extrusion is a crucial method for forming aluminum alloy materials. For products with special shape, size, and performance requirements, or even those requiring the only forming technology, extruded products are widely used in aerospace, transportation, large ships, and modern automobiles due to their unique properties. During aluminum alloy extrusion, the metal undergoes severe deformation under the combined effects of temperature and stress, and the cross-sectional temperature determines the forming quality of the extruded product. To ensure the quality of aluminum alloy extrusions at the exit, isothermal extrusion technology is widely used. This technology effectively improves the uniformity of the microstructure and properties of extruded aluminum alloy products by ensuring a constant or nearly constant exit temperature.

[0003] Currently, there are many methods for achieving isothermal extrusion, such as manual adjustment, speed closed-loop control, die temperature control, and billet gradient heating. Manual adjustment involves manually adjusting the speed based on the extrusion exit temperature readings to maintain a constant extrusion temperature. However, this method requires highly skilled workers and suffers from significant temperature errors due to control lag. Die temperature control regulates the extrusion cylinder temperature through zoned heating and cooling to ensure stable aluminum alloy extrusion exit temperature, but it demands sophisticated equipment and is complex to control. Billet gradient heating uses induction furnaces or other controllable furnaces to gradually heat the billet, thus ensuring the aluminum alloy extrusion exit temperature. However, it also requires sophisticated equipment and is complex to control. Compared to the above three methods, speed closed-loop control achieves a constant extrusion exit temperature by adjusting the extrusion speed and is currently a widely used method in industry. However, due to the significant lag in temperature changes during extrusion and the time required for speed adjustment, the temperature control accuracy during extrusion is not high, and production efficiency is low.

[0004] Therefore, it is necessary to provide an isothermal extrusion method for aluminum alloys to overcome the technical problems existing in the above-mentioned existing isothermal extrusion methods. Summary of the Invention

[0005] To address some or all of the technical problems existing in the prior art, the present invention provides an isothermal extrusion method for aluminum alloys based on data feedback optimization control. This method can improve the extrusion forming efficiency and quality of aluminum alloy bars and reduce the raw material loss during aluminum alloy bar extrusion.

[0006] The technical solution of the present invention is as follows:

[0007] A method for isothermal extrusion of aluminum alloys based on data feedback optimization control is provided, including:

[0008] Step 1: Extrude the aluminum alloy bar at a preset initial temperature and a preset initial extrusion speed;

[0009] Step 2: Obtain the extrusion outlet temperature of the aluminum alloy bar in real time, and determine in real time whether the extrusion outlet temperature of the aluminum alloy bar is not less than the preset maximum temperature. If so, adjust the extrusion speed in real time according to the preset control equation. If not, continue extrusion based on the given extrusion speed until the current aluminum alloy bar is extruded.

[0010] Step 3: Obtain the extrusion speed change function of the current aluminum alloy bar during the extrusion process, and correct the extrusion speed change function to obtain the corrected speed for the extrusion of the next aluminum alloy bar.

[0011] Step 4: If further extrusion is required, the next aluminum alloy bar is extruded at a preset initial temperature and corrected speed, and the process is repeated in step 2 until all aluminum alloy bars have been extruded.

[0012] Furthermore, in some embodiments, the preset control equation is expressed as:

[0013] ;

[0014] in, This indicates the adjusted extrusion speed. This indicates the extrusion speed before adjustment. This indicates the amount of adjustment for the extrusion speed.

[0015] Furthermore, in some embodiments, the extrusion speed adjustment amount is obtained in the following manner:

[0016] ;

[0017] ;

[0018] ;

[0019] in, This represents the proportionality coefficient. Indicates the preset initial extrusion speed. This represents the proportionality coefficient of the temperature difference. This represents the temperature proportionality coefficient. Indicates the preset ideal temperature. Indicates real-time temperature. Represents the velocity constant. This indicates the preset maximum temperature. This indicates the preset minimum temperature.

[0020] Furthermore, in some embodiments, the preset ideal temperature, the preset maximum temperature, and the preset minimum temperature satisfy the following relationship:

[0021] ;

[0022] ;

[0023] in, This indicates the preset allowable deviation value for temperature control.

[0024] Furthermore, in some embodiments, the correction of the extrusion speed as a function of time to obtain the corrected speed for the extrusion of the next aluminum alloy bar includes:

[0025] Determine the starting point for adjusting the extrusion speed of aluminum alloy bars due to temperature fluctuations during the extrusion process;

[0026] Based on the thermal inertia effect and the extrusion speed control rate, the amount of advance time required to mitigate temperature hysteresis is determined according to the extrusion speed and extrusion outlet temperature data before and after the start time.

[0027] Based on a determined start time and the amount of advance time required to mitigate temperature hysteresis, the corrected speed for the extrusion of the next aluminum alloy bar is obtained through mathematical fitting according to the extrusion speed as a function of time.

[0028] Furthermore, in some embodiments, the amount of advance time required to mitigate temperature hysteresis is determined in the following manner:

[0029] ;

[0030] in, This indicates the amount of advance time required to mitigate temperature hysteresis. Indicates the amount of adjustment for the extrusion speed. Indicates the acceleration of the extrusion equipment. This represents the temperature change before and after the initial moment. This indicates the rate of temperature rise at the initial moment. Represents a time variable.

[0031] Furthermore, in some embodiments, the corrected speed for extruding the next aluminum alloy bar is determined in the following manner:

[0032] ;

[0033] in, Indicates the corrected speed. Indicates the state before the correction. The velocity value at that moment, Indicates the start time. This indicates the amount of advance time required to mitigate temperature hysteresis. Represents a time variable. Represents the slope of the linear transformation of velocity. This represents the coefficient of amplitude of the curve oscillation related to the exponentially decaying sine term. Represents the natural constant. This represents the decay rate of the curve fluctuations. Indicates the fluctuation frequency. This indicates the phase offset. This represents the amplitude coefficient of the curve fluctuation related to the cosine term. This represents the operation of the sine function. This represents the operation of the cosine function.

[0034] Furthermore, in some embodiments, the method further includes:

[0035] The collected temperature and velocity data were subjected to noise reduction, filtering, and smoothing processes to remove measurement noise and random fluctuations.

[0036] The main advantages of the technical solution of this invention are as follows:

[0037] The isothermal extrusion method for aluminum alloys based on data feedback optimization control of the present invention collects key process parameter data in real time during the aluminum alloy extrusion process, and performs dynamic closed-loop optimization control of the extrusion speed based on real-time feedback signals of extrusion outlet temperature and extrusion speed. This effectively solves the defects in existing aluminum alloy extrusion production caused by large fluctuations in process parameters and lag in control response, resulting in unstable product dimensional accuracy and difficulty in improving production efficiency. It can significantly improve the extrusion forming efficiency and quality of aluminum alloy bars, reduce scrap rate, and reduce raw material loss in aluminum alloy bar extrusion. Attached Figure Description

[0038] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and constitute a part of this invention, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0039] Figure 1 A flowchart of an isothermal extrusion method for aluminum alloys based on data feedback optimization control is provided for an embodiment of the present invention;

[0040] Figure 2 This is a temperature-extrusion speed-time curve of the first aluminum alloy bar obtained by extrusion using the method provided in this embodiment of the invention.

[0041] Figure 3This is a temperature-extrusion speed-time curve of the second aluminum alloy bar obtained by extrusion using the method provided in this embodiment of the invention.

[0042] Figure 4 The temperature-extrusion speed-time curve is shown for the last aluminum alloy bar obtained by extrusion using the method provided in the embodiments of the present invention. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0044] The technical solutions provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0045] refer to Figure 1 This invention provides an isothermal extrusion method for aluminum alloys based on data feedback optimization control, the method comprising the following steps:

[0046] Step 1: Extrude the aluminum alloy bar at a preset initial temperature and a preset initial extrusion speed;

[0047] Step 2: Obtain the extrusion outlet temperature of the aluminum alloy bar in real time, and determine in real time whether the extrusion outlet temperature of the aluminum alloy bar is not less than the preset maximum temperature. If so, adjust the extrusion speed in real time according to the preset control equation. If not, continue extrusion based on the given extrusion speed until the current aluminum alloy bar is extruded.

[0048] Step 3: Obtain the extrusion speed change function of the current aluminum alloy bar during the extrusion process, and correct the extrusion speed change function to obtain the corrected speed for the extrusion of the next aluminum alloy bar.

[0049] Step 4: If further extrusion is required, the next aluminum alloy bar is extruded at a preset initial temperature and corrected speed, and the process is repeated in step 2 until all aluminum alloy bars have been extruded.

[0050] In this embodiment of the invention, the preset initial temperature and preset initial extrusion speed are set according to actual conditions to ensure that when the aluminum alloy bar is extruded at the preset initial temperature and preset initial extrusion speed, the extrusion outlet temperature of the aluminum alloy bar is not lower than the preset minimum temperature and not higher than the preset maximum temperature after the set extrusion time. The period from the start of extrusion to the set extrusion time is the low-temperature start-up phase of extrusion, and the set extrusion time is set according to actual needs.

[0051] In this embodiment of the invention, data on the change of extrusion speed over time during the extrusion process of aluminum alloy bars are collected in real time, and the function of extrusion speed over time during the extrusion process of aluminum alloy bars is determined based on the data on the change of extrusion speed over time.

[0052] The isothermal extrusion method for aluminum alloys based on data feedback optimization control provided in this invention collects key process parameter data during the aluminum alloy extrusion process in real time, and performs dynamic closed-loop optimization control of the extrusion speed based on real-time feedback signals of extrusion outlet temperature and extrusion speed. This effectively solves the defects in existing aluminum alloy extrusion production, such as unstable product dimensional accuracy and difficulty in improving production efficiency caused by large fluctuations in process parameters and lag in control response. It can significantly improve the extrusion forming efficiency and quality of aluminum alloy bars, reduce scrap rate, and reduce raw material loss in aluminum alloy bar extrusion.

[0053] Furthermore, in this embodiment of the invention, the preset control equation is expressed as:

[0054] ;

[0055] in, This indicates the adjusted extrusion speed. This indicates the extrusion speed before adjustment. This indicates the amount of adjustment for the extrusion speed.

[0056] In this embodiment of the invention, the extrusion speed adjustment amount Obtain it through the following methods:

[0057] ;

[0058] ;

[0059] ;

[0060] in, This represents the proportionality coefficient. Indicates the preset initial extrusion speed. This represents the proportionality coefficient of the temperature difference. This represents the temperature proportionality coefficient. Indicates the preset ideal temperature. Indicates real-time temperature. Represents the velocity constant. This indicates the preset maximum temperature. This indicates the preset minimum temperature.

[0061] The temperature proportionality coefficient is related to the extrusion equipment, and its specific value is set according to the actual situation; the speed constant is related to the extrusion speed and meets the following constraints: and The specific values ​​should be set according to the actual situation.

[0062] In this embodiment of the invention, the preset ideal temperature, preset maximum temperature, and preset minimum temperature are set according to actual needs.

[0063] In this embodiment of the invention, the preset ideal temperature, the preset maximum temperature, and the preset minimum temperature satisfy the following relationship:

[0064] ;

[0065] ;

[0066] in, This indicates the preset allowable deviation value for temperature control.

[0067] In this embodiment of the invention, the preset control equation adopts a proportional adjustment mechanism based on real-time temperature deviation, which can realize adaptive and rapid adjustment of extrusion speed, thereby effectively improving the accuracy and stability of temperature control during isothermal extrusion.

[0068] Furthermore, in this embodiment of the invention, the function of extrusion speed versus time is corrected to obtain a corrected speed for extruding the next aluminum alloy bar, including the following steps:

[0069] Step 301: Determine the starting moment when the extrusion speed of the aluminum alloy bar is adjusted due to temperature fluctuations during the extrusion process;

[0070] Step 302: Based on the thermal inertia effect and the extrusion speed control rate, determine the amount of advance time required to mitigate the temperature lag, according to the extrusion speed and extrusion outlet temperature data before and after the start time.

[0071] Step 303: Based on the determined start time and the amount of advance time required to mitigate temperature hysteresis, the corrected speed for the extrusion of the next aluminum alloy bar is obtained through mathematical fitting according to the extrusion speed change function over time.

[0072] In this embodiment of the invention, by correcting the extrusion speed in the above manner, the corrected speed for the next aluminum alloy bar extrusion is determined. This process takes into account the effects of thermal inertia and the speed control during the extrusion process, and significantly improves the predictability and accuracy of temperature control during the isothermal extrusion of aluminum alloys.

[0073] Furthermore, in this embodiment of the invention, the amount of advance time required to mitigate temperature hysteresis is determined in the following manner:

[0074] ;

[0075] in, This indicates the amount of advance time required to mitigate temperature hysteresis. Indicates the amount of adjustment for the extrusion speed. Indicates the acceleration of the extrusion equipment. This represents the temperature change before and after the initial moment. This indicates the rate of temperature rise at the initial moment. Represents a time variable.

[0076] The temperature rise rate can be obtained by taking the derivative of the function of temperature change with time, or it can be calculated using the difference formula based on the temperature difference and time difference data between the starting time and the previous time.

[0077] In this embodiment of the invention, This reflects the influence of the extrusion speed control rate. This reflects the effect of thermal inertia.

[0078] In this embodiment of the invention, the corrected speed for extruding the next aluminum alloy bar is determined in the following manner:

[0079] ;

[0080] in, Indicates the corrected speed. Indicates the state before the correction. The velocity value at that moment, Indicates the start time. This indicates the amount of advance time required to mitigate temperature hysteresis. Represents a time variable. Represents the slope of the linear transformation of velocity. This represents the coefficient of amplitude of the curve oscillation related to the exponentially decaying sine term. Represents the natural constant. This represents the decay rate of the curve fluctuations. Indicates the fluctuation frequency. This indicates the phase offset. This represents the amplitude coefficient of the curve fluctuation related to the cosine term. This represents the operation of the sine function. This represents the operation of the cosine function.

[0081] Among them, parameters , , , , , This is obtained by fitting the actual extrusion speed data of current aluminum alloy bars, for example, by fitting using the least squares method.

[0082] In an embodiment of the present invention, This is a linear trend term, used to reflect the overall increasing or decreasing trend of speed. This is a damped oscillation term used to simulate the velocity overshoot, oscillation, and gradual stabilization process caused by feedback control. This is a periodic fluctuation term used to fit certain specific periodic disturbances.

[0083] In this embodiment of the invention, by determining the corrected speed for the extrusion of the next aluminum alloy bar in the above manner, the extrusion speed can be pre-adjusted proactively, thereby effectively overcoming the temperature control lag problem caused by thermal inertia effect and extrusion speed regulation rate.

[0084] Furthermore, in an optional embodiment of the present invention, the method further includes: further correcting the modified speed using the following formula:

[0085] ;

[0086] in, This indicates the speed after further correction. Indicates the corrected speed. This represents the correction factor.

[0087] The correction factor is related to the difference between the actual extrusion exit temperature and the ideal temperature of the next aluminum alloy bar. The specific value is set according to the actual situation, and is generally set to a constant close to 1.

[0088] Furthermore, in an optional embodiment of the present invention, the method further includes: performing noise reduction, filtering, and smoothing processing on the collected temperature data and speed data respectively, so as to remove measurement noise and random fluctuations in the data and improve the accuracy and reliability of the data.

[0089] The following example illustrates the isothermal extrusion method for aluminum alloys based on data feedback optimization control provided in this embodiment of the invention:

[0090] When the first aluminum alloy bar is extruded, it is extruded at a preset initial temperature and a preset initial extrusion speed. The extrusion outlet temperature of the aluminum alloy bar is acquired in real time, and it is determined in real time whether the extrusion outlet temperature is not lower than the preset maximum temperature. If so, the extrusion speed is adjusted in real time according to the preset control equation mentioned above. If not, the extrusion continues based on the given extrusion speed until the current aluminum alloy bar is extruded. The extrusion speed change function of the current aluminum alloy bar during the extrusion process is acquired. Based on the above-set correction method and the method for determining the corrected speed, the extrusion speed change function over time is corrected to obtain the corrected speed for the extrusion of the second aluminum alloy bar.

[0091] When extruding the second aluminum alloy bar, the aluminum alloy bar is extruded at a preset initial temperature and a corrected speed obtained from the extrusion data of the first aluminum alloy bar. The extrusion outlet temperature of the aluminum alloy bar is acquired in real time, and it is determined in real time whether the extrusion outlet temperature is not lower than the preset maximum temperature. If so, the extrusion speed is adjusted in real time according to the preset control equation mentioned above. If not, the extrusion continues based on the given extrusion speed until the current aluminum alloy bar is extruded. The extrusion speed change function of the current aluminum alloy bar during the extrusion process is acquired. Based on the above-set correction method and the method for determining the corrected speed, the extrusion speed change function over time is corrected to obtain the corrected speed for extruding the third aluminum alloy bar.

[0092] When extruding the nth aluminum alloy bar, the aluminum alloy bar is extruded at a preset initial temperature and a corrected speed obtained from the extrusion data of the (n-1)th aluminum alloy bar. The extrusion outlet temperature of the aluminum alloy bar is acquired in real time, and it is determined in real time whether the extrusion outlet temperature is not less than the preset maximum temperature. If so, the extrusion speed is adjusted in real time according to the preset control equation mentioned above. If not, the extrusion continues based on the given extrusion speed until the current aluminum alloy bar is extruded. The extrusion speed change function of the current aluminum alloy bar during the extrusion process is acquired. Based on the above-set correction method and the method for determining the corrected speed, the extrusion speed change function over time is corrected to obtain the corrected speed for extruding the (n+1)th aluminum alloy bar.

[0093] After each aluminum alloy bar is extruded, the process described above is repeated for the next aluminum alloy bar until N aluminum alloy bars are extruded.

[0094] Further, in this embodiment of the invention, based on the following parameters: a preset initial temperature of 470°C, a preset initial extrusion speed of 6 mm / s, a preset ideal temperature of 525°C, a preset maximum temperature of 530°C, and a preset minimum temperature of 520°C; the isothermal extrusion method for aluminum alloys based on data feedback optimization control provided in this embodiment of the invention is used to extrude 6082 aluminum alloy bars, resulting in the following... Figure 2 The temperature-extrusion speed-time curve of the first aluminum alloy bar extruded is shown below. Figure 3 The temperature-extrusion speed-time curve of the second aluminum alloy bar shown is as follows, and so on. Figure 4 The graph shown is a temperature-extrusion speed-time curve of the last aluminum alloy bar during extrusion.

[0095] according to Figures 2-4 It can be seen that during the extrusion of the first aluminum alloy bar, the extrusion outlet temperature fluctuated significantly, exceeding the preset maximum temperature three times, requiring multiple adjustments to the extrusion speed. During the extrusion of the second aluminum alloy bar, the fluctuation in extrusion outlet temperature decreased significantly, exceeding the preset maximum temperature only once, reducing the number of extrusion speed adjustments. During the extrusion of the last aluminum alloy bar, the extrusion outlet temperature remained stable near the preset ideal temperature, without exceeding the preset maximum temperature. Therefore, when using the data feedback-based optimized control isothermal extrusion method for aluminum alloys provided in this embodiment of the invention, the extrusion outlet temperature of the aluminum alloy bar can be maintained within a preset range and stabilized near the preset ideal temperature as the extrusion process progresses. This effectively solves the defects in existing aluminum alloy extrusion production caused by large fluctuations in process parameters and lag in control response, resulting in unstable product dimensional accuracy and difficulty in improving production efficiency. It can significantly improve the extrusion forming efficiency and quality of aluminum alloy bars, reduce scrap rate, and reduce raw material loss during aluminum alloy bar extrusion.

[0096] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Additionally, the terms "front," "back," "left," "right," "upper," and "lower" in this document refer to the placement shown in the accompanying drawings.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method of isothermal extrusion of an aluminum alloy based on data feedback optimization control, characterized by, The method comprises the following steps: Step 1, extruding the aluminum alloy rod at a preset initial temperature and a preset initial extrusion speed; Step 2, acquiring the extrusion outlet temperature of the aluminum alloy rod in real time, and judging whether the extrusion outlet temperature of the aluminum alloy rod is not less than a preset maximum temperature in real time, if yes, adjusting the extrusion speed in real time through a preset control equation, if not, continuing to extrude based on the given extrusion speed until the extrusion of the current aluminum alloy rod is completed; Step 3, acquiring a function of the change of the extrusion speed with time during the extrusion process of the current aluminum alloy rod, and correcting the function of the change of the extrusion speed with time to obtain a corrected speed for extruding the next aluminum alloy rod; Step 4, if it is necessary to continue to extrude, extruding the next aluminum alloy rod at a preset initial temperature and the corrected speed, and returning to step 2 to execute cyclically until the extrusion of all the aluminum alloy rods is completed; The correcting of the function of the change of the extrusion speed with time to obtain the corrected speed for extruding the next aluminum alloy rod comprises: determining a starting time of the adjustment of the extrusion speed due to temperature fluctuation during the extrusion process of the aluminum alloy rod; based on the thermal inertia effect and the extrusion speed control rate, determining an amount of time required to advance for slowing down temperature hysteresis according to the extrusion speed and the extrusion outlet temperature data before and after the starting time; based on the determined starting time and the amount of time required to advance for slowing down temperature hysteresis, obtaining the corrected speed for extruding the next aluminum alloy rod through mathematical fitting according to the function of the change of the extrusion speed with time.

2. The method of claim 1, wherein, The preset control equation is expressed as: ； wherein denotes the adjusted extrusion speed, denotes the unadjusted extrusion speed, denotes the extrusion speed adjustment.

3. The method of claim 2, wherein the data feedback optimized control of isothermal aluminum alloy extrusion is characterized by, The amount of adjustment of the extrusion speed is obtained by the following method: ； ； ； wherein, represents a proportionality coefficient, represents a preset initial extrusion speed, represents a temperature difference proportionality coefficient, represents a temperature proportionality coefficient, represents a preset ideal temperature, represents a real-time temperature, represents a speed constant, represents a preset maximum temperature, represents a preset minimum temperature.

4. The method of claim 3, wherein, The preset ideal temperature, the preset maximum temperature and the preset minimum temperature satisfy the following relationship: ； ； wherein, represents a preset temperature control allowable deviation value.

5. The method of claim 1, wherein, The amount of time required to advance for slowing down temperature hysteresis is determined by the following method: ； wherein, represents the amount of time required for advance for mitigating temperature hysteresis, represents the amount of extrusion speed adjustment, represents the extrusion device acceleration, represents the amount of temperature change before and after the start time, represents the temperature increase rate at the start time, represents the time variable.

6. The data feedback optimized control-based isothermal extrusion method of aluminum alloy according to claim 1, characterized in that, The corrected speed for extruding the next aluminum alloy rod is determined by the following method: ； wherein represents the modified speed, represents the unmodified speed value at the time instant, represents the start time instant, represents the amount of time to advance for mitigating temperature hysteresis, represents the time variable, represents the speed linear transformation slope, represents the curve fluctuation amplitude coefficient related to the exponential decay sinusoidal term, represents the natural constant, represents the decay rate of the curve fluctuation, represents the fluctuation frequency, represents the phase shift, represents the curve fluctuation amplitude coefficient related to the cosine term, represents the sinusoidal function operation, represents the cosine function operation.

7. The data feedback optimized control based isothermal extrusion of aluminum alloy method according to any one of claims 1-6, characterized in that, The method further comprises: respectively performing noise reduction processing, filtering processing and smoothing processing on the collected temperature data and speed data to remove measurement noise and random fluctuations in the data.

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