Preparation process of aluminum plate for energy-saving and environment-friendly curtain wall material

Abstract

The invention relates to the technical field of aluminum plate preparation, in particular to a preparation process of an aluminum plate for an energy-saving and environment-friendly curtain wall material, which comprises the following steps: smelting an aluminum ingot into molten aluminum by using a smelting furnace, adding a refining agent into the molten aluminum, stirring, conveying the refined molten aluminum to a casting machine, and cooling to output a cast ingot; carrying out annealing treatment on the cast ingot, carrying out hot rolling on the annealed cast ingot by using a hot rolling mill so as to output an aluminum plate blank, carrying out surface treatment on the aluminum plate blank by using an anodic oxidation method, and coating the aluminum plate blank with an energy-saving and environment-friendly curtain wall material so as to output an aluminum plate; determining the preparation stability of the aluminum plate based on the temperature rise rate in the smelting furnace; if the preparation stability does not meet the requirement, the rotating speed of a stirrer in the smelting furnace is adjusted; and if the quality characteristics do not meet the requirements, the rolling reduction of the hot rolling mill is adjusted. The preparation stability of the aluminum plate is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum sheet preparation, and particularly to a preparation process of aluminum sheets for energy-saving and environmental-friendly curtain wall materials. Background Art

[0002] In the prior art, traditional curtain wall materials often have problems such as high energy consumption and serious environmental pollution during use. For example, the heat insulation performance of some ordinary curtain wall aluminum sheets is poor, resulting in a large amount of energy being consumed for cooling in summer and more heat being required to maintain the indoor temperature in winter in buildings. This not only increases the energy cost but also exacerbates the pressure of energy shortage. At the same time, in the traditional aluminum sheet preparation process, due to technical and equipment limitations, there are problems such as low production efficiency and unstable product quality, which further affect the performance and market competitiveness of curtain wall materials. In the general trend of energy conservation and environmental protection, it is urgent to develop a new preparation process of aluminum sheets for energy-saving and environmental-friendly curtain wall materials.

[0003] Chinese Patent Publication No.: CN107236883A discloses a preparation process of aluminum alloy plates, including the following steps: (1) Homogenization: melting pure aluminum ingots and intermediate metals, performing degassing and slag removal processes to reduce the hydrogen slag concentration in the aluminum melt, then removing oxides and non-metallic inclusions in the aluminum melt through a filtration process, casting aluminum alloy ingot blanks and performing homogenization. The intermediate metals include zinc ingots, magnesium ingots, electrolytic copper, Al-Zr, and Al-Ti. The mass percentage composition of each component of the cast aluminum alloy ingot blank is: Zn 4.5% - 9.5%, Mg 1.0% - 2.8%, Cu 0 - 2.5%, Zr 0.05% - 0.25%, and the balance is Al; (2) Machining: cutting the heads and tails of the homogenized aluminum alloy ingot blank and sawing it into hot-rolled billets with a thickness of 400 - 600 mm and a width of 1500 - 2000 mm; (3) Preheating: heating the hot-rolled billet in step (2) at 350 - 450 °C for 4 - 20 hours; (4) Hot rolling: after preheating is completed, rolling the hot-rolled billet into a plate with a thickness of 80 - 300 mm; (5) Tensile: transferring the plate in step (4) to a tensile machine for tensile, and the tensile amount is 0.5% - 1.5%; (6) Solution quenching: putting the plate in step (5) into a roller hearth furnace, with a holding temperature of 450 - 490 °C and a holding time of 500 - 900 min, and then performing three-stage quenching. The first-stage quenching: cooling the solution temperature from 450 °C - 490 °C to 430 °C - 440 °C, with a quenching water pressure of 1.2 - 2.4 bar and a cooling rate of 5 - 20 °C / s; the second-stage quenching: cooling the aluminum alloy plate material after the first-stage quenching to 220 °C - 240 °C, with a quenching water pressure of 3.0 - 5.0 bar and a cooling rate of 30 - 50 °C / s; the third-stage quenching: cooling the aluminum alloy plate material after the second-stage quenching to 35 °C - 45 °C, with a quenching water pressure of 0.5 - 2.0 bar and a cooling rate of 5 - 15 °C / s. It can be seen that the preparation process of the aluminum alloy plates has the problem that due to the aging phenomenon of the heating elements in the melting furnace after long-term use, its resistance increases, the temperature in the furnace rises too fast, the aluminum liquid is over-oxidized, the content of oxidation inclusions increases, thus resulting in a decrease in the preparation stability of the aluminum plates. Summary of the Invention

[0004] Therefore, the present invention provides a preparation process of aluminum plates for energy-saving and environmental-friendly curtain wall materials to overcome the problem in the prior art that due to the aging phenomenon of the heating elements in the melting furnace after long-term use, its resistance increases, the temperature in the furnace rises too fast, the aluminum liquid is over-oxidized, the content of oxidation inclusions increases, thus resulting in a decrease in the preparation stability of the aluminum plates.

[0005] To achieve the above object, the present invention provides a preparation process for aluminum sheets used in energy-saving and environment-friendly curtain wall materials, including: melting aluminum ingots into aluminum liquid using a melting furnace, adding a refining agent to the aluminum liquid and stirring, transporting the refined aluminum liquid to a casting machine and cooling it to output ingots; annealing the ingots, hot-rolling the annealed ingots using a hot rolling mill to output aluminum slabs, and performing surface treatment on the aluminum slabs using an anodic oxidation method and coating them with energy-saving and environment-friendly curtain wall materials to output aluminum sheets; obtaining the temperature in the melting furnace per unit time; determining the preparation stability of the aluminum sheets based on the temperature rise rate in the melting furnace; if the preparation stability does not meet the requirements, adjusting the rotation speed of the stirrer in the melting furnace, or determining the quality characteristics of the aluminum sheets based on the fluctuation range of the roll rotation speed in the hot rolling mill; if the quality characteristics do not meet the requirements, adjusting the reduction amount of the hot rolling mill, or adjusting the anodic oxidation voltage based on the maximum difference in the thickness of the oxide film on the surface of the aluminum sheets.

[0006] Further, determining the preparation stability of the aluminum sheets includes:

[0007] Comparing the temperature rise rate in the melting furnace with a preset first temperature rise rate;

[0008] If the temperature rise rate in the melting furnace is greater than the preset first temperature rise rate, it is determined that the preparation stability of the aluminum sheets does not meet the requirements.

[0009] Further, determining the quality characteristics of the aluminum sheets includes:

[0010] Comparing the temperature rise rate in the melting furnace with the preset first temperature rise rate and the preset second temperature rise rate respectively;

[0011] If the temperature rise rate in the melting furnace is greater than the preset first temperature rise rate and less than or equal to the preset second temperature rise rate, it is preliminarily determined that the quality characteristics of the aluminum sheets do not meet the requirements, and it is determined whether the quality characteristics of the aluminum sheets meet the requirements according to the fluctuation range of the roll rotation speed in the hot rolling mill.

[0012] Further, adjusting the rotation speed of the stirrer in the melting furnace includes:

[0013] Comparing the temperature rise rate in the melting furnace with the preset second temperature rise rate;

[0014] If the temperature rise rate in the melting furnace is greater than the preset second temperature rise rate, increasing the rotation speed of the stirrer in the melting furnace.

[0015] Further, the increase amplitude of the rotation speed of the stirrer in the melting furnace is determined by the difference between the temperature rise rate in the melting furnace and the preset second temperature rise rate.

[0016] Further, adjusting the reduction amount of the hot rolling mill includes:

[0017] Comparing the fluctuation amplitude of the roll speed in the hot rolling mill with a preset first fluctuation amplitude and a preset second fluctuation amplitude respectively;

[0018] If the fluctuation amplitude of the roll speed in the hot rolling mill is greater than the preset first fluctuation amplitude, it is determined that the quality characteristics of the aluminum sheet do not meet the requirements;

[0019] If the fluctuation amplitude of the roll speed in the hot rolling mill is greater than the preset first fluctuation amplitude and less than or equal to the preset second fluctuation amplitude, reduce the reduction amount of the hot rolling mill;

[0020] If the fluctuation amplitude of the roll speed in the hot rolling mill is greater than the preset second fluctuation amplitude, it is preliminarily determined that the treatment effectiveness of the aluminum slab does not meet the requirements, and it is determined whether the treatment effectiveness of the aluminum slab meets the requirements according to the maximum difference in the thickness of the oxide film on the surface of the aluminum sheet.

[0021] Further, the reduction amplitude of the reduction amount of the hot rolling mill is determined by the difference between the fluctuation amplitude of the roll speed in the hot rolling mill and the preset first fluctuation amplitude.

[0022] Further, adjusting the anodic oxidation voltage includes:

[0023] Comparing the maximum difference in the thickness of the oxide film on the surface of the aluminum sheet with a preset difference;

[0024] If the maximum difference in the thickness of the oxide film on the surface of the aluminum sheet is greater than the preset difference, it is determined that the treatment effectiveness of the aluminum slab does not meet the requirements, and increase the anodic oxidation voltage.

[0025] Further, the maximum difference in the thickness of the oxide film on the surface of the aluminum sheet is the difference between the maximum thickness and the minimum thickness of the oxide film on the surface of the aluminum sheet at several sampling points.

[0026] Further, the increase amplitude of the anodic oxidation voltage is determined by the difference between the maximum difference in the thickness of the oxide film on the surface of the aluminum sheet and the preset difference.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows. The process of the present invention adjusts the rotation speed of the stirrer in the smelting furnace according to the temperature rising rate in the smelting furnace. Since the heating element in the smelting furnace may age after long-term use, resulting in an increase in its resistance, the temperature in the furnace rises too fast, causing the molten aluminum to be over-oxidized and increasing the content of oxidation inclusions. By increasing the rotation speed of the stirrer in the smelting furnace, the heat transfer can be accelerated, making the overall temperature of the molten aluminum more uniform, enabling the refining agent to react with the oxidation inclusions faster, and promoting the floating and removal of the inclusions. The reduction amount of the hot rolling mill is adjusted according to the fluctuation range of the roll rotation speed in the hot rolling mill. Since the gears in the transmission system of the hot rolling mill become loose, resulting in uneven roll rotation speed and thus causing fluctuations in the rolling force, by reducing the reduction amount of the hot rolling mill, the contact pressure between the roll and the aluminum sheet during rolling can be reduced, thereby correspondingly reducing the rolling force, which is beneficial to controlling the rolling force within a relatively stable range. The anodic oxidation voltage is adjusted according to the maximum difference in the thickness of the oxide film on the surface of the aluminum sheet. Since there may be oil stains on the surface of the aluminum sheet, hindering the uniform progress of the oxidation reaction and causing the oxide film to not grow normally in the area with oil stains, resulting in uneven oxide film thickness. By increasing the anodic oxidation voltage, the electric field effect can be enhanced, providing more energy for the oxidation reaction, making it easier for aluminum ions to break away from the aluminum matrix and combine with oxygen ions in the electrolyte, thereby promoting the oxidation reaction in the area with oil stains, accelerating the growth rate of the oxide film, reducing the thickness gap with the area without oil stains, and improving the preparation stability of the aluminum sheet.

[0028] Further, the process of the present invention adjusts the rotation speed of the stirrer in the smelting furnace by setting a preset first rising rate and a preset second rising rate. Since the heating element in the smelting furnace may age after long-term use, resulting in an increase in its resistance, the temperature in the furnace rises too fast, causing the molten aluminum to be over-oxidized and increasing the content of oxidation inclusions. By increasing the rotation speed of the stirrer in the smelting furnace, the heat transfer can be accelerated, making the overall temperature of the molten aluminum more uniform, enabling the refining agent to react with the oxidation inclusions faster, and promoting the floating and removal of the inclusions, further improving the preparation stability of the aluminum sheet.

[0029] Further, the process of the present invention adjusts the reduction amount of the hot rolling mill by setting a preset first fluctuation range and a preset second fluctuation range. Since the gears in the transmission system of the hot rolling mill become loose, resulting in uneven roll rotation speed and thus causing fluctuations in the rolling force, by reducing the reduction amount of the hot rolling mill, the contact pressure between the roll and the aluminum sheet during rolling can be reduced, thereby correspondingly reducing the rolling force, which is beneficial to controlling the rolling force within a relatively stable range, further improving the preparation stability of the aluminum sheet.

[0030] Furthermore, in the process of the present invention, by setting a preset difference amount, the anodic oxidation voltage is adjusted. Since there may be oil stains on the surface of the aluminum sheet, which hinder the uniform progress of the oxidation reaction, resulting in the inability of the oxide film to grow normally in the area with oil stains, thus causing uneven thickness of the oxide film. By increasing the anodic oxidation voltage, the electric field effect can be enhanced, providing more energy for the oxidation reaction, making it easier for aluminum ions to break away from the aluminum matrix and combine with oxygen ions in the electrolyte, thereby promoting the oxidation reaction in the area with oil stains, accelerating the growth rate of the oxide film, reducing the thickness gap with the area without oil stains, and further improving the preparation stability of the aluminum sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is the overall flowchart of the preparation process of the aluminum sheet for the energy-saving and environmental-friendly curtain wall material in the embodiment of the present invention;

[0032] Figure 2 is the specific flowchart of the process of adjusting the rotation speed of the stirrer in the melting furnace in the preparation process of the aluminum sheet for the energy-saving and environmental-friendly curtain wall material in the embodiment of the present invention;

[0033] Figure 3 is the specific flowchart of the process of adjusting the reduction amount of the hot rolling mill in the preparation process of the aluminum sheet for the energy-saving and environmental-friendly curtain wall material in the embodiment of the present invention;

[0034] Figure 4 is the specific flowchart of the process of adjusting the anodic oxidation voltage in the preparation process of the aluminum sheet for the energy-saving and environmental-friendly curtain wall material in the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] In order to make the objectives and advantages of the present invention clearer, the present invention will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and do not limit the protection scope of the present invention.

[0037] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0038] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 as shown, which are respectively the overall flowchart of the preparation process of aluminum plates for energy-saving and environmental-friendly curtain wall materials in the embodiment of the present invention, the specific flowchart of the process of adjusting the rotation speed of the stirrer in the melting furnace, the specific flowchart of the process of adjusting the reduction amount of the hot rolling mill, and the specific flowchart of the process of adjusting the anodic oxidation voltage. A preparation process of aluminum plates for energy-saving and environmental-friendly curtain wall materials according to the present invention includes:

[0040] Step S1, melting aluminum ingots into aluminum liquid using a melting furnace, adding a refining agent to the aluminum liquid and stirring, and transporting the refined aluminum liquid to a casting machine for cooling to output ingots;

[0041] Step S2, annealing the ingots, hot rolling the annealed ingots using a hot rolling mill to output aluminum slabs, and performing surface treatment on the aluminum slabs using an anodic oxidation method and coating with energy-saving and environmental-friendly curtain wall materials to output aluminum plates;

[0042] Step S3, obtaining the temperature in the melting furnace per unit time;

[0043] Step S4, determining the preparation stability of the aluminum plates based on the temperature increase rate in the melting furnace;

[0044] Step S5, if the preparation stability does not meet the requirements, adjusting the rotation speed of the stirrer in the melting furnace, or determining the quality characteristics of the aluminum plates based on the fluctuation range of the roll rotation speed in the hot rolling mill;

[0045] Step S6, if the quality characteristics do not meet the requirements, adjusting the reduction amount of the hot rolling mill, or adjusting the anodic oxidation voltage based on the maximum difference in the thickness of the oxide film on the surface of the aluminum plates.

[0046] Specifically, the refining agent includes calcium fluoride, magnesium chloride, and potassium carbonate.

[0047] Specifically, the annealing treatment is to put the ingots into a heating furnace, with a heating temperature of 550 - 600 °C and a heat preservation time of 1 - 3 h.

[0048] Specifically, the anodic oxidation method includes using an aluminum plate blank as the anode and a lead plate as the cathode, placing them in a sulfuric acid electrolyte solution, applying a voltage of 10 - 20 V to oxidize the aluminum plate blank. Among them, the concentration of the sulfuric acid electrolyte solution is 15% - 20%, the temperature is 15 - 25 °C, the voltage is 12 - 20 V, and the current density is 1 - 2 A / dm 2 , and the oxidation time is 20 - 60 min.

[0049] Specifically, the energy-saving and environmental protection curtain wall materials include fluorocarbon resin, broken bridge heat insulation strip, and silicone sealant.

[0050] In implementation, the process of the present invention adjusts the rotation speed of the stirrer in the melting furnace according to the temperature rising rate in the melting furnace. Since the heating element in the melting furnace may age after long-term use, resulting in an increase in its resistance, causing the temperature in the furnace to rise too fast, over-oxidizing the molten aluminum, increasing the content of oxidation inclusions. By increasing the rotation speed of the stirrer in the melting furnace, the heat transfer can be accelerated, making the overall temperature of the molten aluminum more uniform, allowing the refining agent to react chemically with the oxidation inclusions more quickly, promoting the floating and removal of the inclusions. Adjust the reduction amount of the hot rolling mill according to the fluctuation range of the roll rotation speed in the hot rolling mill. Since the gears in the transmission system of the hot rolling mill become loose, resulting in uneven roll rotation speed and thus fluctuations in the rolling force. By reducing the reduction amount of the hot rolling mill, the contact pressure between the roll and the aluminum sheet during rolling can be reduced, thereby correspondingly reducing the rolling force, which is beneficial to controlling the rolling force within a relatively stable range. Adjust the anodic oxidation voltage according to the maximum difference in the thickness of the oxide film on the surface of the aluminum sheet. Since there may be oil stains on the surface of the aluminum sheet, hindering the uniform progress of the oxidation reaction, resulting in the inability of the oxide film to grow normally in the area with oil stains, thus causing uneven oxide film thickness. By increasing the anodic oxidation voltage, the electric field effect can be enhanced, providing more energy for the oxidation reaction, making it easier for aluminum ions to break away from the aluminum matrix and combine with oxygen ions in the electrolyte, thereby promoting the oxidation reaction in the area with oil stains, accelerating the growth rate of the oxide film, narrowing the thickness gap with the area without oil stains, and improving the preparation stability of the aluminum sheet.

[0051] Specifically, determining the preparation stability of the aluminum sheet includes:

[0052] Obtain the temperature in the melting furnace per unit time and calculate the temperature rising rate in the melting furnace;

[0053] Compare the temperature rising rate in the melting furnace with a preset first rising rate;

[0054] If the temperature rising rate in the melting furnace is greater than the preset first rising rate, it is determined that the preparation stability of the aluminum sheet does not meet the requirements.

[0055] Specifically, determining the quality characteristics of the aluminum sheet includes:

[0056] Comparing the temperature increase rate in the melting furnace with the preset first increase rate and the preset second increase rate respectively;

[0057] If the temperature increase rate in the melting furnace is greater than the preset first increase rate and less than or equal to the preset second increase rate, it is preliminarily determined that the quality characteristics of the aluminum sheet do not meet the requirements, and it is determined whether the quality characteristics of the aluminum sheet meet the requirements according to the fluctuation range of the roll speed in the hot rolling mill.

[0058] It can be understood that the three intervals divided by the preset first increase rate and the preset second increase rate respectively correspond to three situations:

[0059] The first interval is that the temperature increase rate in the melting furnace is less than or equal to the preset first increase rate, and the corresponding situation is: it is determined that the preparation stability of the aluminum sheet meets the requirements;

[0060] The second interval is that the temperature increase rate in the melting furnace is greater than the preset first increase rate and less than or equal to the preset second increase rate, and the corresponding situation is: due to the looseness of the gears in the drive system of the hot rolling mill, the rotation speed of the rolls is uneven, and then the rolling force fluctuates;

[0061] The third interval is that the temperature increase rate in the melting furnace is greater than the preset second increase rate, and the corresponding situation is: due to the possible aging of the heating elements in the melting furnace after long-term use, the resistance increases, the temperature in the furnace rises too fast, the aluminum liquid is over-oxidized, and the content of oxidation inclusions increases.

[0062] In practice, the generally selected range of the preset first increase rate is [13 °C / min, 17 °C / min], and the generally selected range of the preset second increase rate is [18 °C / min, 22 °C / min].

[0063] Preferably, the preferred embodiment of the preset first increase rate is 15 °C / min, and the preferred embodiment of the preset second increase rate is 20 °C / min.

[0064] Specifically, the temperature increase rate in the melting furnace is the ratio of the difference between the temperature in the melting furnace at the end moment and the temperature in the melting furnace at the initial moment within a unit time to the duration of the unit time.

[0065] In implementation, the process of the present invention determines the preparation stability of the aluminum sheet by setting the preset first increase rate and the preset second increase rate, reduces the influence of the decrease in the preparation accuracy of the aluminum sheet caused by inaccurate determination of the preparation stability of the aluminum sheet, and further improves the preparation stability of the aluminum sheet.

[0066] Specifically, adjusting the rotation speed of the stirrer in the smelting furnace includes:

[0067] Comparing the temperature rising rate in the smelting furnace with the preset second temperature rising rate;

[0068] If the temperature rising rate in the smelting furnace is greater than the preset second temperature rising rate, increase the rotation speed of the stirrer in the smelting furnace.

[0069] Specifically, the increasing amplitude of the rotation speed of the stirrer in the smelting furnace is determined by the difference between the temperature rising rate in the smelting furnace and the preset second temperature rising rate.

[0070] Specifically, when the difference between the temperature rising rate in the smelting furnace and the preset second temperature rising rate is within 3 °C / min, the rotation speed of the stirrer in the smelting furnace is increased to 1.1 times the original; when the difference between the temperature rising rate in the smelting furnace and the preset second temperature rising rate exceeds 3 °C / min, on the basis of increasing to 1.1 times the original, for every 1 °C / min exceeded, the rotation speed of the stirrer in the smelting furnace is increased by 10 r / min. For example, if the difference between the temperature rising rate in the smelting furnace and the preset second temperature rising rate is 5 °C / min and the current rotation speed of the stirrer in the smelting furnace is 150 r / min, the increased rotation speed of the stirrer in the smelting furnace is 150×1.1 + 10×2 = 185 r / min.

[0071] In implementation, the process of the present invention adjusts the rotation speed of the stirrer in the smelting furnace by setting a preset first temperature rising rate and a preset second temperature rising rate. Since the heating element of the smelting furnace may age after long-term use, resulting in an increase in its resistance, causing the temperature in the furnace to rise too fast, over-oxidizing the molten aluminum, increasing the content of oxidation inclusions. By increasing the rotation speed of the stirrer in the smelting furnace, the heat transfer can be accelerated, making the overall temperature of the molten aluminum more uniform, enabling the refining agent to react with the oxidation inclusions faster, promoting the floating and removal of the inclusions, and further improving the preparation stability of the aluminum sheet.

[0072] Specifically, adjusting the reduction of the hot rolling mill includes:

[0073] Obtaining the rotation speed of the rolling rolls in the hot rolling mill per unit time and calculating the fluctuation amplitude of the rotation speed of the rolling rolls in the hot rolling mill;

[0074] Comparing the fluctuation amplitude of the rotation speed of the rolling rolls in the hot rolling mill with a preset first fluctuation amplitude and a preset second fluctuation amplitude respectively;

[0075] If the fluctuation amplitude of the rotation speed of the rolling rolls in the hot rolling mill is greater than the preset first fluctuation amplitude, it is determined that the quality characteristics of the aluminum sheet do not meet the requirements;

[0076] If the fluctuation amplitude of the roll speed in the hot rolling mill is greater than the preset first fluctuation amplitude and less than or equal to the preset second fluctuation amplitude, the reduction amount of the hot rolling mill is decreased.

[0077] If the fluctuation amplitude of the roll speed in the hot rolling mill is greater than the preset second fluctuation amplitude, it is preliminarily determined that the processing effectiveness of the aluminum slab does not meet the requirements, and it is determined whether the processing effectiveness of the aluminum slab meets the requirements according to the maximum difference in the thickness of the oxide film on the aluminum sheet surface.

[0078] It can be understood that the three intervals divided by the preset first fluctuation amplitude and the preset second fluctuation amplitude respectively correspond to three situations:

[0079] The first interval is that the fluctuation amplitude of the roll speed in the hot rolling mill is less than or equal to the preset first fluctuation amplitude, and the corresponding situation is: it is determined that the quality characteristics of the aluminum sheet meet the requirements;

[0080] The second interval is that the fluctuation amplitude of the roll speed in the hot rolling mill is greater than the preset first fluctuation amplitude and less than or equal to the preset second fluctuation amplitude, and the corresponding situation is: due to the looseness of the gears in the transmission system of the hot rolling mill, the rotation speed of the rolls is uneven, and then the rolling force fluctuates;

[0081] The third interval is that the fluctuation amplitude of the roll speed in the hot rolling mill is greater than the preset second fluctuation amplitude, and the corresponding situation is: due to the possible presence of oil stains on the surface of the aluminum sheet, which hinders the uniform progress of the oxidation reaction, the oxide film cannot grow normally in the area with oil stains, resulting in uneven thickness of the oxide film.

[0082] In practice, the generally selected range of the preset first fluctuation amplitude is [80 r / min, 120 r / min], and the generally selected range of the preset second fluctuation amplitude is [130 r / min, 170 r / min].

[0083] Preferably, the preferred embodiment of the preset first fluctuation amplitude is 100 r / min, and the preferred embodiment of the preset second fluctuation amplitude is 150 r / min.

[0084] Specifically, the fluctuation amplitude of the roll speed in the hot rolling mill is the difference between the maximum roll speed and the minimum roll speed in the hot rolling mill per unit time.

[0085] In implementation, the process of the present invention determines the quality characteristics of the aluminum sheet by setting the preset first fluctuation amplitude and the preset second fluctuation amplitude, reduces the influence of the decrease in the preparation stability of the aluminum sheet caused by inaccurate determination of the quality characteristics of the aluminum sheet, and further improves the preparation stability of the aluminum sheet.

[0086] Specifically, the reduction amplitude of the reduction amount of the hot rolling mill is determined by the difference between the fluctuation amplitude of the roll speed in the hot rolling mill and the preset first fluctuation amplitude.

[0087] Specifically, when the difference between the fluctuation amplitude of the roll speed in the hot rolling mill and the preset first fluctuation amplitude is within 20 r / min, the reduction amount of the hot rolling mill is reduced to 0.9 times the original; when the difference between the fluctuation amplitude of the roll speed in the hot rolling mill and the preset first fluctuation amplitude exceeds 20 r / min, on the basis of being reduced to 0.9 times the original, for every 5 r / min exceeded, the reduction amount of the hot rolling mill is reduced by 3 mm. For example, if the difference between the fluctuation amplitude of the roll speed in the hot rolling mill and the preset first fluctuation amplitude is 30 r / min and the current reduction amount of the hot rolling mill is 50 mm, the reduced reduction amount of the hot rolling mill is 50×0.9 - 3×2 = 39 mm.

[0088] In implementation, the process of the present invention adjusts the reduction amount of the hot rolling mill by setting a preset first fluctuation amplitude and a preset second fluctuation amplitude. Due to the looseness of the gears in the transmission system of the hot rolling mill, the rotational speed of the rolls is uneven, and thus the rolling force fluctuates. By reducing the reduction amount of the hot rolling mill, the contact pressure between the rolls and the aluminum sheet during rolling can be reduced, thereby reducing the rolling force accordingly, which is beneficial to controlling the rolling force within a relatively stable range and further improving the preparation stability of the aluminum sheet.

[0089] Specifically, adjusting the anodic oxidation voltage includes:

[0090] Obtaining the thickness of the oxide film on the surface of the aluminum sheet at a number of sampling points and calculating the maximum difference in the thickness of the oxide film on the surface of the aluminum sheet;

[0091] Comparing the maximum difference in the thickness of the oxide film on the surface of the aluminum sheet with a preset difference;

[0092] If the maximum difference in the thickness of the oxide film on the surface of the aluminum sheet is greater than the preset difference, it is determined that the treatment effectiveness of the aluminum slab does not meet the requirements, and the anodic oxidation voltage is increased.

[0093] It can be understood that the two intervals divided by the preset difference correspond to two situations respectively:

[0094] The first interval is that the maximum difference in the thickness of the oxide film on the surface of the aluminum sheet is less than or equal to the preset difference, and the corresponding situation is: it is determined that the treatment effectiveness of the aluminum slab meets the requirements;

[0095] The second interval is that the maximum difference in the thickness of the oxide film on the surface of the aluminum sheet is greater than the preset difference, and the corresponding situation is: since there may be oil stains on the surface of the aluminum sheet, which hinders the uniform progress of the oxidation reaction, resulting in the inability of the oxide film to grow normally in the area with oil stains, thus causing uneven thickness of the oxide film.

[0096] In practice, the generally selected range of the preset difference amount is [2 μm, 4 μm].

[0097] Preferably, a preferred embodiment of the preset difference amount is 3 μm.

[0098] In implementation, the process of the present invention determines the processing effectiveness of the aluminum slab by setting the preset difference amount, reducing the impact of the decline in the preparation stability of the aluminum sheet caused by inaccurate determination of the processing effectiveness of the aluminum slab, and further improving the preparation stability of the aluminum sheet.

[0099] Specifically, the maximum difference amount of the thickness of the surface oxide film of the aluminum sheet is the difference between the maximum thickness and the minimum thickness of the surface oxide film of the aluminum sheet among several sampling points.

[0100] Specifically, the increase amplitude of the anodic oxidation voltage is determined by the difference between the maximum difference amount of the thickness of the surface oxide film of the aluminum sheet and the preset difference amount.

[0101] Specifically, when the difference between the maximum difference amount of the thickness of the surface oxide film of the aluminum sheet and the preset difference amount is within 2 μm, the anodic oxidation voltage increases to 1.2 times the original; when the difference between the maximum difference amount of the thickness of the surface oxide film of the aluminum sheet and the preset difference amount exceeds 2 μm, on the basis of increasing to 1.2 times the original, for each additional 1 μm, the anodic oxidation voltage increases by 1 V. For example, if the difference between the maximum difference amount of the thickness of the surface oxide film of the aluminum sheet and the preset difference amount is 4 μm and the current anodic oxidation voltage is 10 V, the increased anodic oxidation voltage is 10×1.2 + 1×2 = 14 V.

[0102] In implementation, the process of the present invention adjusts the anodic oxidation voltage by setting the preset difference amount. Since there may be oil stains on the surface of the aluminum sheet, which hinder the uniform progress of the oxidation reaction and cause the oxide film to not grow normally in the area with oil stains, resulting in uneven thickness of the oxide film. By increasing the anodic oxidation voltage, the electric field effect can be enhanced, providing more energy for the oxidation reaction, making it easier for aluminum ions to break away from the aluminum matrix and combine with oxygen ions in the electrolyte, thereby promoting the oxidation reaction in the area with oil stains, accelerating the growth rate of the oxide film, reducing the thickness gap with the area without oil stains, and further improving the preparation stability of the aluminum sheet.

[0103] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.

Claims

1. A process for preparing an aluminum plate for energy-saving and environmentally friendly curtain wall material, characterized in that: include: Using a smelting furnace to melt the aluminum ingot into aluminum liquid, adding a refining agent to the aluminum liquid and stirring it, conveying the refined aluminum liquid to a casting machine and cooling it to output an ingot; Annealing the ingot, hot rolling the annealed ingot using a hot rolling mill to output an aluminum slab, surface treating the aluminum slab using an anodizing method and coating the aluminum slab with an energy-saving and environment-friendly curtain wall material to output an aluminum plate; Get the temperature in the smelting furnace per unit time; Determining the stability of aluminum sheet production based on the temperature increase rate in the melting furnace; If the preparation stability does not meet the requirements, the speed of the stirrer in the smelting furnace is adjusted, or the quality characteristics of the aluminum plate are determined based on the fluctuation range of the speed of the rolls in the hot rolling mill; If the quality characteristics do not meet the requirements, the reduction amount of the hot rolling mill is adjusted, or the anodizing voltage is adjusted based on the maximum difference in the thickness of the oxide film on the surface of the aluminum plate.

2. The process for preparing the energy-saving and environment-friendly aluminum sheet for curtain wall materials according to claim 1, characterized in that: Determining the preparation stability of the aluminum sheet includes: comparing a temperature increase rate in the smelting furnace with a preset first increase rate; If the temperature increase rate in the smelting furnace is greater than the preset first increase rate, it is determined that the preparation stability of the aluminum plate does not meet the requirements.

3. The process for preparing the energy-saving and environment-friendly aluminum sheet for curtain wall materials according to claim 2, characterized in that: Determine the quality characteristics of the aluminum sheet, including: Comparing the temperature increase rate in the smelting furnace with the preset first increase rate and the preset second increase rate respectively; If the temperature rise rate in the smelting furnace is greater than the preset first rise rate and less than or equal to the preset second rise rate, it is preliminarily determined that the quality characteristics of the aluminum plate do not meet the requirements, and whether the quality characteristics of the aluminum plate meet the requirements is determined based on the fluctuation amplitude of the rolling speed of the rolling mill.

4. The process for preparing the energy-saving and environment-friendly aluminum sheet for curtain wall materials according to claim 3 is characterized in that: The rotation speed of the stirrer in the smelting furnace is adjusted, including: comparing the temperature increase rate in the smelting furnace with the preset second increase rate; If the temperature increase rate in the smelting furnace is greater than a preset second increase rate, the rotation speed of the stirrer in the smelting furnace is increased.

5. The process for preparing the energy-saving and environment-friendly aluminum sheet for curtain wall materials according to claim 4, characterized in that: The increase range of the rotation speed of the stirrer in the smelting furnace is determined by the difference between the temperature increase rate in the smelting furnace and a preset second increase rate.

6. The process for preparing the energy-saving and environment-friendly aluminum sheet for curtain wall materials according to claim 5, characterized in that: The reduction amount of the hot rolling mill is adjusted, comprising: Comparing the fluctuation amplitude of the speed of the rollers in the hot rolling mill with the preset first fluctuation amplitude and the preset second fluctuation amplitude respectively; If the fluctuation range of the roller speed in the hot rolling mill is greater than the preset first fluctuation range, it is determined that the quality characteristics of the aluminum plate do not meet the requirements; If the fluctuation range of the roller speed in the hot rolling mill is greater than the preset first fluctuation range and less than or equal to the preset second fluctuation range, reducing the reduction amount of the hot rolling mill; If the fluctuation amplitude of the rolling speed of the hot rolling mill is greater than the preset second fluctuation amplitude, it is preliminarily determined that the processing effectiveness of the aluminum slab does not meet the requirements, and whether the processing effectiveness of the aluminum slab meets the requirements is determined based on the maximum difference in the thickness of the oxide film on the surface of the aluminum plate.

7. The process for preparing the energy-saving and environment-friendly aluminum sheet for curtain wall materials according to claim 6, characterized in that: The reduction range of the reduction amount of the hot rolling mill is determined by the difference between the fluctuation range of the speed of the rolls in the hot rolling mill and the preset first fluctuation range.

8. The process for preparing the energy-saving and environment-friendly aluminum sheet for curtain wall materials according to claim 7, characterized in that: The anodizing voltage is adjusted, comprising: Compare the maximum difference in the thickness of the oxide film on the surface of the aluminum plate with the preset difference; If the maximum difference in the thickness of the oxide film on the surface of the aluminum plate is greater than the preset difference, it is determined that the processing effectiveness of the aluminum plate blank does not meet the requirements, and the anodizing voltage is increased.

9. The process for preparing the energy-saving and environment-friendly aluminum sheet for curtain wall materials according to claim 8, characterized in that: The maximum difference in the thickness of the oxide film on the surface of the aluminum plate is the difference between the maximum thickness and the minimum thickness of the oxide film on the surface of the aluminum plate at a plurality of sampling points.

10. The process for preparing the energy-saving and environment-friendly aluminum sheet for curtain wall materials according to claim 9, characterized in that: The increase range of the anodizing voltage is determined by the difference between the maximum difference in the thickness of the oxide film on the surface of the aluminum plate and a preset difference.

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