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

Abstract

The present application relates to aluminum plate preparation technical field, especially to a kind of energy-saving and environment-friendly type curtain wall material with aluminum plate preparation process, comprising: using smelting furnace to smelt aluminum ingot into aluminum liquid, adding refining agent to the aluminum liquid and stirring, after refining, aluminum liquid is transported to casting machine and cooled to output cast ingot;The cast ingot is annealed, and the cast ingot after annealing is hot-rolled using a hot rolling mill to output aluminum slab, the surface of aluminum slab is treated using anodic oxidation method and coated with energy-saving and environment-friendly type curtain wall material to output aluminum plate;The preparation stability of aluminum plate is determined based on the temperature rising rate in smelting furnace;If the preparation stability does not meet the requirements, the speed of stirrer in smelting furnace is adjusted;If the quality characteristics do not meet the requirements, the reduction of hot rolling mill is adjusted.The preparation stability of aluminum plate is improved.

Description

Technical Field

[0001] This invention relates to the field of aluminum sheet preparation technology, and in particular to a process for preparing aluminum sheets for energy-saving and environmentally friendly curtain wall materials. Background Technology

[0002] Existing technologies and traditional curtain wall materials often suffer from high energy consumption and severe environmental pollution during use. For example, some ordinary aluminum curtain wall panels have poor thermal insulation performance, causing buildings to consume large amounts of energy for cooling in summer and requiring even more heat to maintain indoor temperatures in winter. This not only increases energy costs but also exacerbates energy shortages. Furthermore, traditional aluminum panel manufacturing processes suffer from low production efficiency and unstable product quality due to technological and equipment limitations, further impacting the performance and market competitiveness of curtain wall materials. Under the major trend of energy conservation and environmental protection, the development of new energy-saving and environmentally friendly aluminum panel manufacturing processes for curtain walls is urgently needed.

[0003] Chinese Patent Publication No. CN107236883A discloses a process for preparing aluminum alloy sheets, including the following steps: (1) Homogenization: pure aluminum ingots and intermediate metals are smelted, and a degassing and slag removal process is performed to reduce the hydrogen slag concentration in the aluminum melt. Then, an oxide and non-metallic inclusion in the aluminum melt are removed by a filtration process. An aluminum alloy ingot is cast and homogenized. The intermediate metals include zinc ingots, magnesium ingots, electrolytic copper, Al-Zr, and Al-Ti. The cast aluminum alloy... The mass percentage composition of each component of the ingot is as follows: Zn 4.5%~9.5%, Mg 1.0%~2.8%, Cu 0~2.5%, Zr 0.05%~0.25%, with the balance being Al; (2) Machining: The homogenized aluminum alloy ingot is cut at both ends and sawn into hot-rolled billets with a thickness of 400~600mm and a width of 1500~2000mm; (3) Preheating: The hot-rolled billets from step (2) are heated at 350~450℃ for 4~20 hours; 4) Hot rolling: After preheating, the hot-rolled billet is rolled into a plate with a thickness of 80-300mm; (5) Stretching: The plate from step (4) is transferred to a stretching machine for stretching, with a stretching amount of 0.5%-1.5%; (6) Solution quenching: The plate from step (5) is placed in a roller hearth furnace, with a holding temperature of 450-490℃ and a holding time of 500-900min, followed by three-stage quenching. The first stage of quenching: the solution temperature is cooled from 450℃-490℃ to 4 The first-stage quenching process involves cooling the aluminum alloy sheet material to 220℃-240℃ at a water pressure of 3.0-5.0 bar and a cooling rate of 30-50℃ / s after the first-stage quenching. The second-stage quenching involves cooling the aluminum alloy sheet material to 35℃-45℃ at a water pressure of 0.5-2.0 bar and a cooling rate of 5-15℃ / s after the second-stage quenching. It is evident that the aluminum alloy sheet preparation process suffers from a problem: the heating elements of the melting furnace age after long-term use, leading to increased resistance, excessively rapid temperature rise within the furnace, over-oxidation of the molten aluminum, and increased oxide inclusion content, thus reducing the stability of the prepared aluminum sheet. Summary of the Invention

[0004] Therefore, this invention provides a process for preparing aluminum sheets for energy-saving and environmentally friendly curtain wall materials, which overcomes the problem in the prior art where the heating elements of the melting furnace age after long-term use, resulting in increased resistance, excessively rapid temperature rise in the furnace, excessive oxidation of the aluminum liquid, and increased content of oxide inclusions, thus causing a decrease in the stability of aluminum sheet preparation.

[0005] To achieve the above objectives, this invention provides a process for preparing aluminum sheets for energy-saving and environmentally friendly curtain wall materials, comprising: melting aluminum ingots into molten aluminum using a melting furnace; adding a refining agent to the molten aluminum and stirring; conveying the refined molten aluminum 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 anodizing and coating it with an energy-saving and environmentally friendly curtain wall material to output an aluminum sheet; obtaining the temperature in the melting furnace per unit time; determining the preparation stability of the aluminum sheet based on the rate of temperature rise 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 sheet 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 of the hot rolling mill, or adjusting the anodizing voltage based on the maximum difference in the thickness of the oxide film on the surface of the aluminum sheet.

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

[0007] The rate of temperature increase in the melting furnace is compared with a preset first rate of increase;

[0008] If the rate of temperature increase in the smelting furnace is greater than the preset first rate of increase, then the stability of the aluminum sheet preparation is determined to be unsatisfactory.

[0009] Further, the quality characteristics of the aluminum sheet are determined, including:

[0010] The rate of temperature increase in the smelting furnace is compared with the preset first rate of increase and the preset second rate of increase, respectively;

[0011] 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 sheet do not meet the requirements, and the quality characteristics of the aluminum sheet are determined based on the fluctuation range of the roll speed in the hot rolling mill.

[0012] Furthermore, adjusting the rotational speed of the agitator in the smelting furnace includes:

[0013] The rate of temperature increase in the smelting furnace is compared with the preset second rate of increase;

[0014] If the rate of temperature increase in the smelting furnace is greater than the preset second rate of increase, then the rotation speed of the stirrer in the smelting furnace is increased.

[0015] Furthermore, the increase in the rotational speed of the agitator in the melting furnace is determined by the difference between the rate of temperature increase in the melting furnace and a preset second rate of temperature increase.

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

[0017] The fluctuation range of the roll speed in the hot rolling mill is compared with the preset first fluctuation range and the preset second fluctuation range, respectively;

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

[0019] If the fluctuation range of the roll 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, then the reduction of the hot rolling mill shall be reduced.

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

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

[0022] Further, adjusting the anodizing voltage includes:

[0023] Compare the maximum difference in the thickness of the oxide film on the surface of the aluminum sheet with the 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 processing effectiveness of the aluminum slab does not meet the requirements, and the anodizing voltage is increased.

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

[0026] Furthermore, the increase in 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 sheet and a 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 rate of temperature rise in the smelting furnace. Since the heating elements of the smelting furnace may age after long-term use, leading to increased resistance and excessively rapid temperature rise in the furnace, causing excessive oxidation of the molten aluminum and increasing the content of oxide inclusions, increasing the rotation speed of the stirrer in the smelting furnace can accelerate heat transfer, making the overall temperature of the molten aluminum more uniform, allowing the refining agent to react chemically with the oxide inclusions more quickly, promoting the removal of inclusions by floating to the surface. The reduction of the hot rolling mill is adjusted according to the fluctuation range of the roll speed in the hot rolling mill. Because loose gears in the transmission system of the hot rolling mill cause uneven roll speeds, resulting in fluctuations in rolling force, the reduction of the hot rolling mill... The reduction in rolling pressure can decrease the contact pressure between the rolls and the aluminum sheet during rolling, thereby reducing the rolling force and helping to control the rolling force within a relatively stable range. The anodizing voltage is adjusted according to the maximum difference in the thickness of the oxide film on the aluminum sheet surface. Since there may be oil on the surface of the aluminum sheet, it hinders the uniform oxidation reaction, causing the oxide film to fail to grow normally in the oily areas, resulting in uneven oxide film thickness. By increasing the anodizing voltage, the electric field effect can be enhanced, providing more energy for the oxidation reaction, making it easier for aluminum ions to detach from the aluminum matrix and combine with oxygen ions in the electrolyte, thereby promoting the oxidation reaction in the oily areas, accelerating the oxide film growth rate, narrowing the thickness difference with the oil-free areas, and improving the preparation stability of the aluminum sheet.

[0028] Furthermore, the process described in this 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 of the smelting furnace may age after long-term use, its resistance may increase, causing the temperature inside the furnace to rise too quickly, resulting in excessive oxidation of the aluminum liquid and an increase in the content of oxide inclusions. By increasing the rotation speed of the stirrer in the smelting furnace, heat transfer can be accelerated, making the overall temperature of the aluminum liquid more uniform, allowing the refining agent to react chemically with the oxide inclusions more quickly, promoting the removal of inclusions by floating to the surface, and further improving the stability of aluminum sheet preparation.

[0029] Furthermore, the process described in this invention adjusts the reduction of the hot rolling mill by setting a preset first fluctuation amplitude and a preset second fluctuation amplitude. Due to the loosening of gears in the transmission system of the hot rolling mill, the rotational speed of the rolls is uneven, which in turn causes fluctuations in the rolling force. By reducing the reduction of the hot rolling mill, the contact pressure between the rolls and the aluminum sheet during the rolling process can be reduced, thereby reducing the rolling force accordingly. This helps to control the rolling force within a relatively stable range and further improves the stability of aluminum sheet preparation.

[0030] Furthermore, the process described in this invention adjusts the anodizing voltage by setting a preset difference amount. Since oil stains may exist on the surface of the aluminum sheet, hindering the uniformity of the oxidation reaction, the oxide film cannot grow normally in the oil-stained areas, resulting in uneven oxide film thickness. By increasing the anodizing voltage, the electric field effect can be enhanced, providing more energy for the oxidation reaction, making it easier for aluminum ions to detach from the aluminum matrix and combine with oxygen ions in the electrolyte, thereby promoting the oxidation reaction in the oil-stained areas, accelerating the oxide film growth rate, narrowing the thickness difference with the oil-free areas, and further improving the preparation stability of the aluminum sheet. Attached Figure Description

[0031] Figure 1 This is an overall flow chart of the preparation process of aluminum sheet for energy-saving and environmentally friendly curtain wall materials according to an embodiment of the present invention;

[0032] Figure 2 This is a flowchart illustrating the process of adjusting the speed of the stirrer in the melting furnace during the preparation of aluminum sheets for energy-saving and environmentally friendly curtain wall materials according to an embodiment of the present invention.

[0033] Figure 3 This is a flowchart illustrating the process of adjusting the reduction amount of the hot rolling mill in the preparation process of aluminum sheets for energy-saving and environmentally friendly curtain wall materials according to an embodiment of the present invention.

[0034] Figure 4 This is a flowchart illustrating the process of adjusting the anodizing voltage in the preparation of aluminum sheets for energy-saving and environmentally friendly curtain wall materials according to an embodiment of the present invention. Detailed Implementation

[0035] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0036] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

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

[0038] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] Please see Figure 1 , Figure 2 , Figure 3 as well as Figure 4 The diagrams shown are, respectively, an overall flow chart of the preparation process of aluminum sheets for energy-saving and environmentally friendly curtain wall materials according to an embodiment of the present invention, a specific flow chart of the process of adjusting the speed of the stirrer in the melting furnace, a specific flow chart of the process of adjusting the reduction of the hot rolling mill, and a specific flow chart of the process of adjusting the anodizing voltage. The present invention provides a preparation process for aluminum sheets for energy-saving and environmentally friendly curtain wall materials, comprising:

[0040] Step S1: Use a smelting furnace to melt aluminum ingots into molten aluminum, add a refining agent to the molten aluminum and stir, and then transport the refined molten aluminum to a casting machine and cool it to output ingots.

[0041] Step S2: Anneal the ingot, hot roll the annealed ingot with a hot rolling mill to output aluminum slab, and perform surface treatment on the aluminum slab using anodizing and coating with energy-saving and environmentally friendly curtain wall material to output aluminum sheet.

[0042] Step S3: Obtain the temperature in the smelting furnace per unit time;

[0043] Step S4: Determine the preparation stability of aluminum sheet based on the temperature rise rate in the melting furnace;

[0044] Step S5: If the preparation stability does not meet the requirements, the rotation speed of the stirrer in the melting furnace is adjusted, or the quality characteristics of the aluminum sheet are determined based on the fluctuation range of the roll speed in the hot rolling mill.

[0045] Step S6: If the quality characteristics do not meet the requirements, adjust the reduction of the hot rolling mill, or adjust the anodizing voltage based on the maximum difference in the thickness of the oxide film on the surface of the aluminum sheet.

[0046] Specifically, the refining agents include calcium fluoride, magnesium chloride, and potassium carbonate.

[0047] Specifically, the annealing process involves placing the ingot in a heating furnace, heating it to a temperature of 550-600℃, and holding it at that temperature for 1-3 hours.

[0048] Specifically, the anodizing method involves placing an aluminum slab as the anode and a lead plate as the cathode in a sulfuric acid electrolyte, applying a voltage of 10-20V to oxidize the aluminum slab. The sulfuric acid electrolyte concentration is 15%-20%, the temperature is 15-25℃, the voltage is 12-20V, and the current density is 1-2A / dm³. 2 The oxidation time is 20-60 min.

[0049] Specifically, energy-saving and environmentally friendly curtain wall materials include fluorocarbon resin, thermal break strips, and silicone sealant.

[0050] In implementation, the process of this invention adjusts the rotation speed of the stirrer in the smelting furnace according to the rate of temperature rise in the furnace. Because the heating elements in the smelting furnace may age after long-term use, leading to increased resistance and a rapid temperature rise within the furnace, excessive oxidation of the molten aluminum and an increase in the content of oxide inclusions, increasing the rotation speed of the stirrer accelerates heat transfer, making the overall temperature of the molten aluminum more uniform. This allows the refining agent to react chemically with the oxide inclusions more quickly, promoting the removal of inclusions by flotation. The reduction of the hot rolling mill is adjusted according to the fluctuation range of the roll rotation speed. Loose gears in the transmission system of the hot rolling mill cause uneven roll rotation speeds, resulting in fluctuations in rolling force. By reducing the reduction of the hot rolling mill... Reducing the contact pressure between the rolls and the aluminum sheet during rolling reduces the rolling force, which helps to control the rolling force within a relatively stable range. The anodizing voltage is adjusted based on the maximum difference in oxide film thickness on the aluminum sheet surface. Since oil stains may be present on the aluminum sheet surface, hindering the uniform oxidation reaction, the oxide film cannot grow normally in oily areas, resulting in uneven oxide film thickness. Increasing the anodizing voltage enhances the electric field effect, providing more energy for the oxidation reaction. This makes it easier for aluminum ions to detach from the aluminum matrix and combine with oxygen ions in the electrolyte, thereby promoting the oxidation reaction in oily areas, accelerating oxide film growth, narrowing the thickness gap with oil-free areas, and improving the stability of aluminum sheet preparation.

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

[0052] The temperature in the smelting furnace is obtained per unit time, and the rate of temperature increase in the smelting furnace is calculated.

[0053] The rate of temperature increase in the smelting furnace is compared with a preset first rate of increase;

[0054] If the rate of temperature increase in the smelting furnace is greater than the preset first rate of increase, then the stability of the aluminum sheet preparation is determined to be unsatisfactory.

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

[0056] The rate of temperature increase in the smelting furnace is compared with the preset first rate of increase and the preset second rate of increase, respectively;

[0057] 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 sheet do not meet the requirements, and the quality characteristics of the aluminum sheet are determined based on the fluctuation range of the roll speed in the hot rolling mill.

[0058] It is understandable that the three intervals defined by the preset first and second rise rates correspond to three different scenarios:

[0059] The first interval is when the temperature rise rate in the melting furnace is less than or equal to the preset first rise rate, which corresponds to the situation where the stability of the aluminum sheet preparation meets the requirements.

[0060] The second range is when the temperature rise rate in the melting furnace is greater than the preset first rise rate and less than or equal to the preset second rise rate. The corresponding situation is that the gears in the transmission system of the hot rolling mill become loose, resulting in uneven rotation speed of the rolls, which in turn causes fluctuations in the rolling force.

[0061] The third range is when the rate of temperature rise in the smelting furnace is greater than the preset second rate of rise. The corresponding situation is that the heating elements of the smelting furnace may age after long-term use, resulting in increased resistance, causing the temperature inside the furnace to rise too quickly, causing excessive oxidation of the aluminum liquid, and increasing the content of oxide inclusions.

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

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

[0064] Specifically, the rate of temperature rise in the smelting furnace is the ratio of the difference between the temperature at the end of the unit time and the temperature at the beginning of the unit time to the duration of the unit time.

[0065] In practice, the process described in this invention determines the preparation stability of aluminum sheets by setting a preset first rising rate and a preset second rising rate, thereby reducing the impact of inaccurate determination of the preparation stability of aluminum sheets leading to a decrease in the preparation accuracy of aluminum sheets and further improving the preparation stability of aluminum sheets.

[0066] Specifically, adjusting the rotational speed of the agitator in the melting furnace includes:

[0067] The rate of temperature increase in the smelting furnace is compared with the preset second rate of increase;

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

[0069] Specifically, the increase in the rotational speed of the agitator in the melting furnace is determined by the difference between the rate of temperature increase in the melting furnace and a preset second rate of temperature increase.

[0070] Specifically, when the difference between the temperature rise rate in the smelting furnace and the preset second rise rate is within 3℃ / min, the rotation speed of the stirrer in the smelting furnace is increased to 1.1 times the original speed. When the difference between the temperature rise rate in the smelting furnace and the preset second rise rate exceeds 3℃ / min, in addition to increasing to 1.1 times the original speed, the rotation speed of the stirrer in the smelting furnace is increased by 10 r / min for every 1℃ / min increase. For example, if the difference between the temperature rise rate in the smelting furnace and the preset second rise rate is 5℃ / 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 will be 150×1.1+10×2=185 r / min.

[0071] In practice, the process described in this 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 elements of the smelting furnace may age after long-term use, resulting in increased resistance and excessively rapid temperature rise in the furnace, the aluminum liquid is over-oxidized, increasing the content of oxide inclusions. By increasing the rotation speed of the stirrer in the smelting furnace, heat transfer can be accelerated, making the overall temperature of the aluminum liquid more uniform, allowing the refining agent to react chemically with the oxide inclusions more quickly, promoting the removal of inclusions by floating to the surface, and further improving the stability of aluminum sheet preparation.

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

[0073] The rotational speed of the rolls in the hot rolling mill is obtained per unit time, and the fluctuation range of the rotational speed of the rolls in the hot rolling mill is calculated.

[0074] The fluctuation range of the roll speed in the hot rolling mill is compared with the preset first fluctuation range and the preset second fluctuation range, respectively;

[0075] If the fluctuation range of the roll speed in the hot rolling mill is greater than the preset first fluctuation range, then it is determined that the quality characteristics of the aluminum sheet do not meet the requirements.

[0076] If the fluctuation range of the roll 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, then the reduction of the hot rolling mill shall be reduced.

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

[0078] It is understandable that the three intervals defined by the preset first fluctuation range and the preset second fluctuation range correspond to three different scenarios:

[0079] The first interval is when the fluctuation range of the roll speed in the hot rolling mill is less than or equal to the preset first fluctuation range, which corresponds to the situation where the quality characteristics of the aluminum sheet meet the requirements.

[0080] The second range is when the fluctuation range of the roll 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. The corresponding situation is: due to the loosening of gears in the transmission system of the hot rolling mill, the roll speed is uneven, which in turn causes the rolling force to fluctuate.

[0081] The third range is when the fluctuation range of the roll speed in the hot rolling mill is greater than the preset second fluctuation range. The corresponding situation is that there may be oil on the surface of the aluminum sheet, which hinders the uniform oxidation reaction, causing the oxide film to be unable to grow normally in the oily area, resulting in uneven oxide film thickness.

[0082] In practice, the preset first fluctuation amplitude is generally selected in the range of [80r / min, 120r / min], and the preset second fluctuation amplitude is generally selected in the range of [130r / min, 170r / 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 range of the roll speed in a hot rolling mill is the difference between the maximum and minimum speed of the rolls in the hot rolling mill per unit time.

[0085] In practice, the process described in this invention determines the quality characteristics of aluminum sheets by setting a preset first fluctuation range and a preset second fluctuation range, thereby reducing the impact of inaccurate determination of the quality characteristics of aluminum sheets leading to a decrease in the preparation stability of aluminum sheets and further improving the preparation stability of aluminum sheets.

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

[0087] Specifically, when the difference between the fluctuation range of the roll speed in the hot rolling mill and the preset first fluctuation range is within 20 r / min, the reduction of the hot rolling mill is reduced to 0.9 times the original value. When the difference between the fluctuation range of the roll speed in the hot rolling mill and the preset first fluctuation range exceeds 20 r / min, in addition to reducing it to 0.9 times the original value, the reduction of the hot rolling mill is reduced by 3 mm for every 5 r / min exceeding the preset first fluctuation range. For example, if the difference between the fluctuation range of the roll speed in the hot rolling mill and the preset first fluctuation range is 30 r / min, and the current reduction of the hot rolling mill is 50 mm, the reduced reduction of the hot rolling mill is 50 × 0.9 - 3 × 2 = 39 mm.

[0088] In practice, the process described in this invention adjusts the reduction of the hot rolling mill by setting a preset first fluctuation amplitude and a preset second fluctuation amplitude. Due to the loosening of gears in the transmission system of the hot rolling mill, the rotational speed of the rolls is uneven, which in turn causes fluctuations in the rolling force. By reducing the reduction of the hot rolling mill, the contact pressure between the rolls and the aluminum sheet during the rolling process can be reduced, thereby reducing the rolling force accordingly. This helps to control the rolling force within a relatively stable range and further improves the stability of aluminum sheet preparation.

[0089] Specifically, adjusting the anodizing voltage includes:

[0090] The thickness of the oxide film on the surface of the aluminum sheet is obtained at several sampling points, and the maximum difference in the thickness of the oxide film on the surface of the aluminum sheet is calculated.

[0091] The maximum difference in the thickness of the oxide film on the surface of the aluminum sheet is compared 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 processing effectiveness of the aluminum slab does not meet the requirements, and the anodizing voltage is increased.

[0093] It is understandable that the two intervals defined by the pre-defined difference amount correspond to two different scenarios:

[0094] The first interval is when 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, which corresponds to the situation where the effectiveness of the treatment of the aluminum slab meets the requirements.

[0095] The second range is where the maximum difference in the thickness of the oxide film on the surface of the aluminum sheet is greater than the preset difference. The corresponding situation is that there may be oil on the surface of the aluminum sheet, which hinders the uniformity of the oxidation reaction, causing the oxide film to be unable to grow normally in the oily areas, resulting in uneven oxide film thickness.

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

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

[0098] In practice, the process described in this invention determines the effectiveness of aluminum slab processing by setting a preset difference amount, thereby reducing the impact of inaccurate determination of the effectiveness of aluminum slab processing on the stability of aluminum sheet preparation and further improving the stability of aluminum sheet preparation.

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

[0100] Specifically, the increase in 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 sheet and a preset difference.

[0101] Specifically, when the difference between the maximum difference in the thickness of the oxide film on the surface of the aluminum sheet and the preset difference is within 2 μm, the anodizing voltage is increased to 1.2 times the original value. When the difference between the maximum difference in the thickness of the oxide film on the surface of the aluminum sheet and the preset difference exceeds 2 μm, the anodizing voltage is increased by 1 V for every 1 μm exceeding the original value, in addition to the increase to 1.2 times the original value. For example, if the difference between the maximum difference in the thickness of the oxide film on the surface of the aluminum sheet and the preset difference is 4 μm, and the current anodizing voltage is 10 V, the increased anodizing voltage will be 10 × 1.2 + 1 × 2 = 14 V.

[0102] In practice, the process described in this invention adjusts the anodizing voltage by setting a preset difference. Since oil stains may be present on the surface of the aluminum sheet, hindering the uniformity of the oxidation reaction, the oxide film cannot grow normally in the oily areas, resulting in uneven oxide film thickness. By increasing the anodizing voltage, the electric field effect can be enhanced, providing more energy for the oxidation reaction, making it easier for aluminum ions to detach from the aluminum matrix and combine with oxygen ions in the electrolyte. This promotes the oxidation reaction in the oily areas, accelerates the oxide film growth rate, reduces the thickness difference with the oil-free areas, and further improves the stability of aluminum sheet preparation.

[0103] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles 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 scope of protection of the present invention.

Claims

1. A process for preparing aluminum sheets for energy-saving and environmentally friendly curtain wall materials, characterized in that, include: Aluminum ingots are melted into molten aluminum using a smelting furnace. A refining agent is added to the molten aluminum and the mixture is stirred. The refined molten aluminum is then transported to a casting machine and cooled to output ingots. The ingot is annealed, and the annealed ingot is hot rolled using a hot rolling mill to output aluminum slabs. The aluminum slabs are then surface-treated using anodizing and coated with energy-saving and environmentally friendly curtain wall materials to output aluminum sheets. To obtain the temperature in the smelting furnace per unit time; The stability of aluminum sheet preparation was determined based on the rate of temperature rise in the melting furnace; If the preparation stability does not meet the requirements, the speed of the stirrer in the melting furnace is adjusted, or the quality characteristics of the aluminum sheet are determined based on the fluctuation range of the rolling speed in the hot rolling mill. If the quality characteristics do not meet the requirements, the reduction of the hot rolling mill shall be adjusted, or the anodizing voltage shall be adjusted based on the maximum difference in the thickness of the oxide film on the surface of the aluminum sheet. Determining the preparation stability of the aluminum sheet includes: The rate of temperature increase in the melting furnace is compared with a preset first rate of increase; If the rate of temperature increase in the smelting furnace is greater than the preset first rate of increase, then the stability of the aluminum sheet preparation is determined to be unsatisfactory. Determining the quality characteristics of the aluminum sheet includes: The rate of temperature increase in the smelting furnace is compared with the preset first rate of increase and the preset second rate of increase, 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 sheet do not meet the requirements, and the quality characteristics of the aluminum sheet are determined to meet the requirements based on the fluctuation range of the roll speed in the hot rolling mill. The three intervals, defined by the preset first fluctuation range and the preset second fluctuation range, correspond to three different scenarios: The first interval is when the fluctuation range of the roll speed in the hot rolling mill is less than or equal to the preset first fluctuation range, which corresponds to the situation where the quality characteristics of the aluminum sheet meet the requirements. The second range is when the fluctuation range of the roll 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. The corresponding situation is: due to the loosening of gears in the transmission system of the hot rolling mill, the roll speed is uneven, which in turn causes the rolling force to fluctuate. The third range is when the fluctuation range of the roll speed in the hot rolling mill is greater than the preset second fluctuation range. The corresponding situation is that there may be oil on the surface of the aluminum sheet, which hinders the uniform oxidation reaction, causing the oxide film to be unable to grow normally in the oily area, resulting in uneven oxide film thickness.

2. The process for preparing aluminum sheets for energy-saving and environmentally friendly curtain wall materials according to claim 1, characterized in that, Adjusting the rotational speed of the agitator in the smelting furnace includes: The rate of temperature increase in the smelting furnace is compared with the preset second rate of increase; If the rate of temperature increase in the smelting furnace is greater than the preset second rate of increase, then the rotation speed of the stirrer in the smelting furnace is increased.

3. The process for preparing aluminum sheets for energy-saving and environmentally friendly curtain wall materials according to claim 2, characterized in that, The increase in the rotational speed of the agitator in the smelting furnace is determined by the difference between the rate of temperature increase in the smelting furnace and a preset second rate of temperature increase.

4. The process for preparing aluminum sheets for energy-saving and environmentally friendly curtain wall materials according to claim 3, characterized in that, Adjusting the reduction of the hot rolling mill includes: The fluctuation range of the roll speed in the hot rolling mill is compared with the preset first fluctuation range and the preset second fluctuation range, respectively; If the fluctuation range of the roll speed in the hot rolling mill is greater than the preset first fluctuation range, then it is determined that the quality characteristics of the aluminum sheet do not meet the requirements. If the fluctuation range of the roll 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, then the reduction of the hot rolling mill shall be reduced. If the fluctuation range of the roll speed in the hot rolling mill is greater than the preset second fluctuation range, it is preliminarily determined that the processing effectiveness of the aluminum slab does not meet the requirements, and the processing effectiveness of the aluminum slab is determined based on the maximum difference in the thickness of the oxide film on the surface of the aluminum sheet.

5. The process for preparing aluminum sheets for energy-saving and environmentally friendly curtain wall materials according to claim 4, characterized in that, The reduction in the amount of reduction of the hot rolling mill is determined by the difference between the fluctuation range of the roll speed in the hot rolling mill and the preset first fluctuation range.

6. The process for preparing aluminum sheets for energy-saving and environmentally friendly curtain wall materials according to claim 5, characterized in that, Adjusting the anodizing voltage includes: Compare the maximum difference in the thickness of the oxide film on the surface of the aluminum sheet with the preset difference. 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 processing effectiveness of the aluminum slab does not meet the requirements, and the anodizing voltage is increased.

7. The process for preparing aluminum sheets for energy-saving and environmentally friendly curtain wall materials according to claim 6, characterized in that, The maximum difference in the thickness of the oxide film on the surface of the aluminum sheet is the difference between the maximum and minimum thickness of the oxide film on the surface of the aluminum sheet among several sampling points.

8. The process for preparing aluminum sheets for energy-saving and environmentally friendly curtain wall materials according to claim 7, characterized in that, The increase in the anodizing voltage is determined by the difference between the maximum difference in the thickness of the oxide film on the aluminum plate surface and a preset difference.

Images