TWI780982B - Aluminum material with low earing ratio and method for producing the same - Google Patents

Abstract

The present invention relates to an aluminum material with a low earing ratio and a method for producing the same. By a specific annealing temperature of a annealing process after a cold-rolling process, a specific reduction rate of a cold-rolling process after the annealing process and a specific annealing temperature of a annealing process for a product, the method for producing the aluminum material with the low earing ratio controls intensity ratios of cube textures to deformation textures of intermediate aluminum materials in these processes in specific ranges to reduce an earing ratio of the resulted aluminum material, thereby enhancing a processability thereof and decreasing waste.

Description

Low lug ratio aluminum material and manufacturing method thereof

The present invention relates to an aluminum material and its manufacturing method, and in particular to an aluminum material with low lug ratio and its manufacturing method.

Aluminum is a light metal element with good ductility, so aluminum alloys (hereinafter also referred to as aluminum materials) are often used in the manufacture of containers, including sealed and non-sealed aluminum containers, such as aluminum bottles and cans. When manufacturing aluminum containers, the aluminum is stamped to form a container (such as a bottle body, a can body, a bottle cap or a can lid). During the stamping process, the amount of extension and deformation of the aluminum material in all directions is likely to be inconsistent, which makes the edge of the opening end of the aluminum container uneven, that is, the phenomenon of lugs occurs. Excess aluminum must be cut away to level open ends of aluminum containers. Furthermore, as the degree of the lug phenomenon becomes more serious (that is, the edge of the opening end becomes more uneven), the more aluminum material is removed, so the cost increases more. Even too much aluminum was removed, resulting in the height of the container being too low to meet the finished product regulations, so the container became a waste product. In addition, when the lug phenomenon is serious, the wall thickness at the edge of the opening end is uneven, which leads to clogging of corner scraps, which is not conducive to the can making process.

In view of this, there is an urgent need to develop a method for manufacturing low lug ratio aluminum materials to improve the above-mentioned shortcomings of the conventional aluminum material manufacturing methods.

In view of the above problems, an aspect of the present invention is to provide a method for manufacturing a low lug ratio aluminum material. This manufacturing method uses process conditions (such as: annealing temperature and cutting amount) to control the strength ratio of the cubic aggregate structure and the deformed aggregate structure of the intermediate aluminum material within an appropriate range, so as to reduce the lug ratio of the aluminum material produced, thereby improving It improves machinability and reduces waste.

Another aspect of the present invention is to provide a low lug ratio aluminum material. This aluminum material is made by the above-mentioned manufacturing method of low lug ratio aluminum material.

According to an aspect of the present invention, a method for manufacturing a low lug ratio aluminum material is provided. In this manufacturing method, an aluminum blank is provided, wherein the aluminum blank includes 0.05% by weight (wt.%) to 0.15% by weight of silicon, 0.1% by weight to 0.3% by weight of iron, 1.6% by weight to 2% by weight of magnesium, less than 0.01% by weight of copper, less than 0.05% by weight of manganese, less than 0.1% by weight of titanium, the balance of aluminum and unavoidable impurities. Next, the aluminum blank is heated to obtain a heated aluminum blank, wherein the heating temperature of the heating treatment is 480°C to 500°C. The heated aluminum blank is subjected to hot rolling treatment to obtain finished rolled aluminum material, wherein the finishing temperature of the hot rolling treatment is 310°C to 350°C, and the strength ratio of the cubic aggregate structure and the deformed aggregate structure of the finished rolled aluminum material is 2 to 3. Cold-rolling is carried out on the rolled aluminum material to obtain the cold-rolled aluminum material, wherein the reduction amount of the cold-rolled treatment is 75% to 87%. Perform post-cold annealing treatment on the cold-rolled aluminum material to obtain annealed aluminum material, wherein the post-cold-rolled annealing treatment is continuous annealing treatment or batch-type annealing treatment, and the annealing temperature of the continuous annealing treatment is greater than 400°C and Not more than 460°C, the annealing time of continuous annealing treatment is less than 5 seconds, the annealing temperature of batch annealing treatment is 300°C to 330°C, and the annealing time of batch annealing treatment is 1 hour to 4 hours. The post-annealing cold-rolling treatment is performed on the annealed aluminum material to obtain the post-annealing cold-rolling aluminum material, wherein the reduction amount of the post-annealing cold-rolling treatment is 45% to 65%. After annealing, the cold-rolled aluminum material is subjected to finished annealing treatment to obtain low-lug ratio aluminum material. The finished annealing treatment is a batch type finished annealing treatment, and the annealing temperature of the finished product annealing treatment is 150°C to 250°C. The annealing time is 1 hour to 4 hours.

According to an embodiment of the present invention, the aluminum billet further includes no more than 0.04 weight percent of chromium.

According to another embodiment of the present invention, the heating time of the heat treatment is 4 hours to 8 hours.

According to yet another embodiment of the present invention, after the hot rolling treatment, the manufacturing method of the low lug ratio aluminum material further includes a step of hot-rolled post-coiling of the finished rolled aluminum material to form a hot-rolled aluminum coil, and hot-rolled The thickness of the rear aluminum coil is 2mm to 5mm.

According to yet another embodiment of the present invention, the strength ratio of the cubic aggregate structure and the deformed aggregate structure of the aluminum material after cold rolling is 0.5 to 0.7.

According to yet another embodiment of the present invention, after the cold rolling process, the manufacturing method of the low lug ratio aluminum material further includes a step of performing cold rolling and coiling on the cold rolled aluminum material to form a cold rolled aluminum coil, and cold rolling The thickness of rolled aluminum coil is 0.3mm to 1.2mm.

According to yet another embodiment of the present invention, the strength ratio of the cubic aggregate structure and the deformed aggregate structure of the aluminum material after annealing is 0.7 to 1.2.

According to yet another embodiment of the present invention, the strength ratio of the cubic aggregate structure and the deformed aggregate structure of the low lug ratio aluminum material is 0.2 to 0.4.

於式(I)中，Cube、Goss、R-Cube、Cu、Br及S分別代表立方(Cube)、戈斯(Goss)、R-立方(R-Cube)、銅(Copper)、黃銅(Brass)及銀(Silver)之集合組織的強度。 According to yet another embodiment of the present invention, these intensity ratios are obtained by the following formula (I):

In formula (I), Cube, Goss, R-Cube, Cu, Br and S represent cube (Cube), Goss (Goss), R-cube (R-Cube), copper (Copper), brass ( Brass) and silver (Silver) aggregate tissue strength.

Another aspect of the present invention is to provide a low lug ratio aluminum material. The aluminum material is produced by the aforementioned low-lug-ratio aluminum material manufacturing method, wherein the lug ratio of the low-lug-ratio aluminum material is less than 2%.

The low lug ratio aluminum material of the present invention and its manufacturing method are controlled by the specific annealing temperature of the annealing treatment after cold rolling, the specific cutting amount of the cold rolling treatment after annealing, and the specific annealing temperature of the finished annealing treatment. The strength ratio of the cubic aggregate structure and the deformed aggregate structure of the intermediate aluminum materials being processed is within a specific range, so as to reduce the lug ratio of the produced aluminum material, thereby improving its processability and reducing waste.

The making and using of embodiments of the invention are discussed in detail below. It should be appreciated, however, that the embodiments provide many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed are illustrative only and do not limit the scope of the invention.

The manufacturing method of the low lug ratio aluminum material of the present invention utilizes the annealing temperature of the annealing treatment after cold rolling, the reduction amount of the cold rolling treatment after annealing and the annealing temperature of the finished product annealing treatment to control the intermediate aluminum material in these treatments The strength ratio of cubic aggregate structure to deformed aggregate structure is within a specific range to obtain aluminum with low lug ratio. After the stamping process of this low lug ratio aluminum material, the edge of the opening end of the formed aluminum container is flat and the wall thickness is uniform, thereby reducing waste and improving processability, so it is suitable for application in aluminum containers. Incidentally, in order to distinguish the intermediate aluminum material in the aforementioned processing, the "low-lug-ratio aluminum material" produced by the manufacturing method is also referred to as "finished aluminum material" hereinafter.

The "intermediate aluminum material" referred to in the present invention includes rolled aluminum material, cold rolled aluminum material and annealed aluminum material. Further, the "intensity ratio of cubic aggregate structure and deformed aggregate structure" referred to in the present invention refers to measuring the intensity of cubic aggregate structure and deformed aggregate structure on the aforementioned aluminum material by backscattered electron diffraction technology of a scanning electron microscope, Then calculate the strength ratio, and the specific conditions are as described in the test of the strength ratio between the cubic aggregated tissue and the deformed aggregated tissue described later. This backscattered electron diffraction technology is a non-destructive detection method, so it is suitable for the detection of intermediate aluminum materials, which is beneficial to process monitoring and avoids the loss of intermediate aluminum materials.

The "cubic aggregate organization" referred to in the present invention includes the aggregate organization of cube (Cube), Goss (Goss) and R-cube (R-Cube), wherein the cube aggregate organization is the aggregate organization in the direction of {001}<001> , the direction of extension after stamping is the direction of 0 degrees and 90 degrees with the rolling direction of the aluminum material. The Goss aggregate structure is the aggregate structure in the direction of {011}<100>, and its extension direction after stamping is in the direction of 0 degrees and 180 degrees with the rolling direction of the aluminum material. The R-Cube aggregate structure is the aggregate structure in the direction of {001}<110>, and its extension direction after stamping is 0 degrees and 90 degrees to the rolling direction of the aluminum material.

The "deformed aggregate structure" referred to in the present invention includes the aggregate structure of copper (Copper), brass (Brass) and silver (Silver), wherein the copper aggregate structure is the aggregate structure in the direction of {112}<111>, which is stamped The subsequent extension direction is 45 degrees to the rolling direction of the aluminum material. The brass aggregate structure is the aggregate structure in the direction of {011}<211>, and its extension direction after stamping is 45 degrees to the rolling direction of the aluminum material. The silver aggregate structure is the aggregate structure in the direction of {123}<634>, and its extension direction after stamping is 45 degrees to the rolling direction of the aluminum material.

In short, when the cubic aggregate structure and the deformed aggregate structure of aluminum are in a balanced state, low or no lug ratio can be produced, so the balance of the two aggregate structures can be regulated by controlling the process conditions to achieve Reduce the lug ratio for aluminum. The balance of these two aggregates is quantified by the "strength ratio of cubic aggregates and deformed aggregates".

Please refer to FIG. 1 , the manufacturing method 100 of low-lug-ratio aluminum material firstly provides an aluminum blank, as shown in operation 110 . The aluminum blank contains 0.05 to 0.15 weight percent of silicon, 0.1 to 0.3 weight percent of iron, 1.6 to 2 weight percent of magnesium, less than 0.01 weight percent of copper, less than 0.05 weight percent of manganese, less than 0.1 weight percent The percentage of titanium, the balance of aluminum and unavoidable impurities. If the elements contained in the aluminum blank do not meet the aforementioned conditions, the lug rate of the finished aluminum material is too high, so it is not suitable for aluminum containers.

In some embodiments, the aluminum blank optionally includes no more than 0.04 weight percent of chromium. When the chromium content of the aluminum blank is in the aforementioned range, it is beneficial for the strength ratio of the cubic aggregate structure and the deformed aggregate structure of the rolled aluminum material to be in the range of 2 to 3, thus reducing the lug ratio of the finished aluminum material. In some specific examples, the total content of unavoidable impurities is not more than 0.075% by weight. Preferably, the sum of the chromium content and the total content of impurities is not more than 0.1% by weight. When the sum of the chromium content and the total impurity content of the aluminum blank is within the aforementioned range, the strength ratio of the cubic aggregate structure of the rolled aluminum material to the deformed aggregate structure is 2 to 3, and the cubic aggregate structure of the cold-rolled aluminum material and The intensity ratio of the deformed aggregate structure is 0.5 to 0.7, so the lug rate of the finished aluminum material is further reduced. In addition, in some implementations, the manufacturing method 100 of the low lug ratio aluminum material optionally includes a casting step, wherein the composition of the aluminum billet is melted into an aluminum alloy liquid, and the aluminum alloy liquid is cast into an aluminum billet.

After operation 110 , heat treatment is performed on the aluminum blank to obtain a heated aluminum blank, as shown in operation 120 . The heating temperature of the heat treatment is 480°C to 500°C. Preferably, the heating temperature may be from 485°C to 495°C. In some embodiments, the heating time of the heat treatment is 4 hours to 8 hours, preferably 5 hours to 7 hours. When the heating time is within the aforementioned range, it is easy to dissolve the magnesium element, which is conducive to the formation of deformed aggregate structure, so the lug rate of the finished aluminum material is reduced.

After operation 120 , hot rolling is performed on the heated aluminum billet to obtain a rolled aluminum material, as shown in operation 130 . The finishing temperature of the hot rolling treatment is 310°C to 350°C. If the finishing temperature is less than 310°C, it is beneficial to form deformed aggregate structure, but not conducive to the formation of cubic aggregate structure. If the finishing temperature is higher than 350°C, it is beneficial to generate cubic aggregate structure, but it is not conducive to the formation of deformed aggregate structure. In short, the finishing temperature of less than 310°C or greater than 350°C will increase the lug ratio of the finished aluminum product. Preferably, the finishing temperature is 330°C to 340°C. In addition, the strength ratio of the cubic aggregate structure and the deformed aggregate structure of the aforementioned rolled aluminum material is 2 to 3. If the strength ratio of the cubic aggregate structure to the deformed aggregate structure of the finished rolled aluminum material is not within the aforementioned range, the lug ratio of the finished aluminum material is too high, so it is not suitable for use in aluminum containers. Preferably, the strength ratio of the cubic aggregate structure to the deformed aggregate structure of the rolled aluminum material may be 2.0 to 2.5.

Please refer to FIG. 1 again, after operation 130 , the manufacturing method 100 of low lug ratio aluminum material optionally includes performing a hot-rolled post-coil step on the finished rolled aluminum material to form a hot-rolled aluminum coil. In some embodiments, the thickness of the aluminum coil may be 2 mm to 5 mm, and preferably 3 mm to 4 mm. When the thickness of the hot-rolled aluminum coil is within the aforementioned range, the strength ratio of the cubic aggregate structure to the deformed aggregate structure of the hot-rolled aluminum coil is in the range of 2 to 3, thereby reducing the lug ratio of the finished aluminum product.

After operation 130 , cold rolling is performed on the rolled aluminum material to obtain a cold-rolled aluminum material, as shown in operation 140 . In some embodiments, operation 140 may be performed after the aforementioned post-rolling and coiling step. The reduction in cold rolling treatment is 75% to 87%. If the reduction amount of the cold rolling process is not within the aforementioned range, the cubic aggregate structure of the aluminum material after cold rolling will be too much, the strength ratio of the cubic aggregate structure and the deformed aggregate structure will be increased, and the lug ratio of the finished aluminum material will be excessively increased, so the finished aluminum The material is not suitable for use in aluminum containers. Preferably, the reduction in cold rolling is 77% to 85%. In some implementations, the strength ratio of the cubic structure to the deformed structure of the aluminum material after cold rolling may be 0.5 to 0.7, and preferably 0.5 to 0.6. When the strength ratio of the cubic aggregate structure of the cold-rolled aluminum material to the deformed aggregate structure is within the aforementioned range, the lug rate of the finished aluminum material is reduced, so the finished aluminum material is suitable for use in aluminum containers.

Please refer to FIG. 1 again. After operation 140 , the manufacturing method 100 of low lug ratio aluminum material optionally includes performing a post-cold coiling step on the cold-rolled aluminum material to form a cold-rolled aluminum coil. In some embodiments, the thickness of the aluminum coil is 0.3 mm to 1.2 mm, and preferably 0.5 mm to 1.0 mm. When the thickness of the cold-rolled aluminum coil is within the aforementioned range, the strength ratio of the cubic aggregate structure to the deformed aggregate structure of the cold-rolled aluminum coil is in the range of 0.5 to 0.7, thereby reducing the lug ratio of the finished aluminum product.

After operation 140 , the cold-rolled aluminum material is subjected to a post-cold-rolling annealing treatment to obtain an annealed aluminum material, as shown in operation 150 . In some embodiments, operation 150 may be performed after the aforementioned post-cold coiling step. The annealing treatment after cold rolling is continuous annealing treatment or batch annealing treatment.

In detail, in the embodiment of the continuous annealing treatment, the annealing temperature is greater than 400° C. and not greater than 460° C., and the annealing time is less than 5 seconds. In an embodiment of the batch annealing treatment, the annealing temperature of the batch annealing treatment is 300° C. to 330° C., and the annealing time of the batch annealing treatment is 1 hour to 4 hours. If the annealing temperature or annealing time of the annealing treatment after cold rolling is lower than the aforementioned range, the strength ratio of the cubic aggregate structure and the deformed aggregate structure will be too low, which will increase the lug ratio of the finished aluminum material, so the finished aluminum material is not suitable for aluminum container.

If the annealing temperature or annealing time of the annealing treatment after cold rolling is higher than the aforementioned range, the strength ratio of the cubic aggregate structure and the deformed aggregate structure will be too high, which will increase the lug ratio of the finished aluminum material, so the finished aluminum material is not suitable for aluminum container. Preferably, the annealing temperature of the continuous annealing treatment may be 440° C. to 450° C., and the annealing time may be 0.5 seconds to 3 seconds. The annealing temperature of the batch annealing treatment may be 310° C. to 320° C., and the annealing time may be 2 hours to 4 hours.

In some implementations, the strength ratio of the cubic structure to the deformed structure of the aluminum material after annealing may be 0.7 to 1.2, and preferably 0.8 to 0.9. When the strength ratio of the cubic aggregate structure to the deformed aggregate structure of the aluminum material after annealing is within the aforementioned range, the lug ratio of the aluminum material will be further reduced, so the finished aluminum material is more suitable for use in aluminum containers.

After operation 150 , the annealed aluminum material is subjected to a post-annealing cold rolling treatment to obtain an annealed cold-rolled aluminum material, as shown in operation 160 . The reduction amount of cold rolling after annealing is 45% to 65%. If the reduction amount of the cold rolling treatment after annealing is not within the aforementioned range, the cubic aggregate structure of the cold-rolled aluminum material after annealing will be too much, and the strength ratio of the cubic aggregate structure to the deformed aggregate structure will be increased, and the lug ratio of the finished aluminum material will be excessively increased. Therefore, the finished aluminum material is not suitable for use in aluminum containers. Preferably, the reduction in cold rolling after annealing can be 50% to 65%.

After operation 160 , finish annealing is performed on the annealed cold-rolled aluminum material to obtain a low lug ratio aluminum material, as shown in operation 170 . The finished product annealing treatment is a batch annealing treatment, the annealing temperature of this finished product annealing treatment is 150°C to 250°C, and the annealing time is 1 hour to 4 hours. If the annealing temperature of the finished product annealing treatment is less than 150°C, the strength ratio of the cubic aggregate structure to the deformed aggregate structure will be too low, which will increase the lug ratio of the finished aluminum material, so the finished aluminum material is not suitable for use in aluminum containers. If the annealing temperature of the finished product annealing treatment is higher than 250°C, the strength ratio of the cubic aggregate structure and the deformed aggregate structure will be increased, and the lug rate of the finished aluminum material will be excessively increased, so the finished aluminum material is not suitable for use in aluminum containers.

Secondly, if the annealing time of the finished annealing treatment is not within the aforementioned range, the lug rate of the finished aluminum material will be increased, so the finished aluminum material is not suitable for use in aluminum containers. Preferably, the annealing temperature of the finished annealing treatment may be 190° C. to 210° C., and the annealing time is 2.5 hours to 3.5 hours.

Another aspect of the present invention is to provide a low lug ratio aluminum material, which is produced by the above-mentioned manufacturing method of the low lug ratio aluminum material. The lug rate of low lug rate aluminum is less than 2%. If the lug rate of the low lug rate aluminum material is not less than 2%, the lug rate of the finished aluminum material will be increased, so the finished aluminum material is not suitable for use in aluminum containers. Preferably, the lug ratio of the aluminum material is not more than 1.8%.

The following examples are used to illustrate the application of the present invention, but they are not intended to limit the present invention. Anyone skilled in this art can make various changes and modifications without departing from the spirit and scope of the present invention.

Manufacture of finished aluminum

Example 1

The finished aluminum material in Example 1 is to melt the composition of the aluminum blank to form an aluminum alloy solution, and then cast the aluminum alloy solution to form an aluminum blank. Then, the aluminum billets are sequentially subjected to heat treatment, hot rolling treatment, coiling treatment, cold rolling treatment, coiling treatment, annealing treatment after cold rolling, cold rolling treatment after annealing and finished annealing treatment to obtain the finished product of Example 1 Aluminum materials are then evaluated in the evaluation method described below.

Example 2 and Comparative Examples 1 to 4

The finished aluminum materials of Example 2 and Comparative Examples 1 to 4 are manufactured in a method similar to that of Example 1. The difference is that Example 2 and Comparative Examples 1 to 4 use different aluminum blanks and process conditions. The specific conditions and evaluation results of Examples 1 to 2 and Comparative Examples 1 to 4 are shown in Table 1 below.

Evaluation method

1. The test of the strength ratio of cubic aggregate structure and deformed aggregate structure

於式(I)中，Cube、Goss、R-Cube、Cu、Br及S分別代表Cube、Goss、R-Cube、Copper、Brass及Silver之集合組織的強度。 The test of the intensity ratio between the cubic aggregate structure and the deformed aggregate structure uses the electron backscatter diffraction (EBSD) technology of the scanning electron microscope (SEM) to perform elastic diffraction on the aluminum sheet to measure the crystallinity of the aluminum sheet. Grain orientation, where the information fed back by elastic diffraction is analyzed by the Channel 5 software to analyze the strength of the aggregate structure (texture) of the grains on the rolling surface of the aluminum sheet. These aggregates are divided into cubic aggregates and deformed aggregates, where cubic aggregates include Cube, Goss, and R-Cube aggregates, and deformed aggregates include Copper (Cu), Brass (Br) and Silver (S) aggregates . Divide the sum of the strengths of the three cubic aggregates by the sum of the strengths of the three deformed aggregates to obtain the strength ratio, as shown in the following formula (I):

In the formula (I), Cube, Goss, R-Cube, Cu, Br and S respectively represent the intensity of the collective organization of Cube, Goss, R-Cube, Copper, Brass and Silver.

2. Test of lug ratio

於式(II)中，D _H代表D ₁及D ₂二者中之較大值，且D _L代表D1及D2二者中之較小值，其中D ₁及D ₂分別由上式(II-1)及式(II-2)求得。於式(II-1)中，D ₀、D ₉₀、D ₁₈₀及D ₂₇₀分別代表與鋁材軋延方向呈0度、90度、180度及270度之延伸方向上，由基準面起算，容器外壁之垂直伸長量(即垂直距離)。於式(II-2)中，D ₄₅、D ₁₃₅、D ₂₂₅及D ₃₁₅分別代表鋁材與軋延方向呈45度、135度、225度及315度之延伸方向上，由基準面起算，容器外壁之垂直伸長量(即垂直距離)。前述之基準面係指垂直於沖壓方向之平面。若容器之封閉端的封閉平面係垂直於沖壓方向，此封閉平面即為基準面，且前述之垂直伸長量即容器外壁於各方向之高度。 The test of the lug rate is to use the following formula (II) to obtain the lug rate after stamping the finished aluminum material with a cupping machine, wherein the test conditions are the conditions commonly used by those with ordinary knowledge in the technical field of the present invention: .

In formula (II), D _H represents the larger value of both D ₁ and D ₂ , and D _L represents the smaller value of D 1 and D 2, wherein D ₁ and D ₂ are represented by the above formula (II -1) and formula (II-2). In formula (II-1), D ₀ , D ₉₀ , D ₁₈₀ and D ₂₇₀ respectively represent the extension directions of 0 degrees, 90 degrees, 180 degrees and 270 degrees to the rolling direction of the aluminum material, calculated from the reference plane, The vertical elongation of the outer wall of the container (that is, the vertical distance). In the formula (II-2), D ₄₅ , D ₁₃₅ , D ₂₂₅ and D ₃₁₅ respectively represent the extension directions of the aluminum material and the rolling direction at 45 degrees, 135 degrees, 225 degrees and 315 degrees, counting from the datum plane, The vertical elongation of the outer wall of the container (that is, the vertical distance). The aforementioned datum plane refers to the plane perpendicular to the stamping direction. If the closed plane of the closed end of the container is perpendicular to the stamping direction, this closed plane is the reference plane, and the aforementioned vertical elongation is the height of the outer wall of the container in all directions.

Table 1 Example comparative example 1 2 1 2 3 4 Aluminum blank Composition (wt.%) silicon 0.06 0.07 0.06 0.07 0.07 0.08 iron 0.13 0.15 0.13 0.15 0.15 0.16 magnesium 1.7 1.8 1.7 1.8 1.8 2.3 copper 0.004 0.007 0.004 0.007 0.007 0.008 manganese 0.015 0.018 0.015 0.018 0.018 0.019 titanium 0.015 0.011 0.015 0.011 0.011 0.011 chromium 0.036 0.029 0.036 0.029 0.029 0.027 Impurities 0.064 0.071 0.064 0.071 0.071 0.073 heat treatment Heating temperature (℃) 485~495 Heating time (hours) 5~7 Hot rolling treatment Finished rolling temperature (°C) 340 335 340 334 335 337 intensity ratio 2.50 2.10 2.40 2.00 2.00 3.20 Coil handling Aluminum Thickness (mm) 3~4 cold rolling treatment Reduction (%) 85 77 85 84 77 77 intensity ratio 0.50 0.60 0.55 0.58 0.60 0.81 Coil handling Aluminum Thickness (mm) 0.5~1.0 Annealing after cold rolling Annealing method Continuous Batch Continuous Batch Batch Batch Annealing temperature (℃) 450 320 400 320 320 320 Annealing time 1 second 3 hours 30 seconds 3 hours 3 hours 3 hours intensity ratio 0.90 0.82 1.30 0.70 0.80 1.10 Cold rolling treatment after annealing Reduction (%) 50 65 50 70 64 64 Finished annealing Annealing method Batch Annealing temperature (℃) 200 200 200 200 270 200 Annealing time (hours) 3 3 3 3 3 3 intensity ratio 0.36 0.29 0.42 0.15 0.57 0.43 Stamping treatment Lug rate 1.6 1.8 2.3 2.4 3.3 2.2 Note: "Strength ratio" refers to the strength ratio of cubic aggregate tissue and deformed aggregate tissue.

Please refer to Table 1. Compared with Comparative Example 1, the manufacturing method of the aluminum material in Example 1 uses an appropriate annealing treatment after cold rolling (that is, an annealing temperature of 450° C. and an annealing time of 1 second) to reduce the annealing temperature of the annealed aluminum material. The strength ratio of the cubic aggregate structure to the deformed aggregate structure reduces the lug rate of the finished aluminum product.

Secondly, compared with Comparative Example 2, the manufacturing method of the aluminum material in Example 2 uses an appropriate post-annealing cold rolling treatment (that is, a 65% reduction) to reduce the strength of the cubic aggregate structure and the deformed aggregate structure of the finished aluminum material Ratio, so reduce its lug rate.

Furthermore, compared with Comparative Example 3, the manufacturing method of the aluminum material in Example 2 uses an appropriate finished annealing treatment (that is, an annealing temperature of 200° C.) to reduce the strength ratio of the cubic structure and the deformed structure of the finished aluminum material. , so reduce its lug rate.

In addition, compared with Comparative Example 4, the manufacturing methods of the aluminum materials in Examples 1 and 2 both use aluminum blanks with an appropriate content (i.e. 1.7 to 1.8wt.%) of magnesium to reduce the cubic structure, thereby reducing the quality of the finished aluminum. The lug ratio of the material.

In summary, the manufacturing method of the low lug ratio aluminum material of the present invention utilizes the specific annealing temperature of the annealing treatment after cold rolling, the specific cutting amount of the cold rolling treatment after annealing, and the specific annealing temperature control of the annealing treatment of the finished product The strength ratio of the cubic aggregate structure and the deformed aggregate structure of the intermediate aluminum material in these processes is within a specific range, so as to reduce the lug ratio of the produced aluminum material, thereby improving its processability and reducing waste.

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

100: method 110,120,130,140,150,160,170: operation

In order to have a more complete understanding of the embodiments of the present invention and their advantages, please refer to the following descriptions together with the corresponding drawings. It must be emphasized that the various features are not drawn to scale and are for illustration purposes only. The contents of relevant diagrams are explained as follows: FIG. 1 is a flow chart illustrating a method for manufacturing a low lug ratio aluminum material according to an embodiment of the present invention.

100: method

110,120,130,140,150,160,170: operation

Claims (9)

A method of manufacturing a low lug ratio aluminum material, comprising: providing an aluminum blank, wherein the aluminum blank includes: 0.05% by weight to 0.15% by weight of silicon; 0.1% by weight to 0.3% by weight of iron; 1.6% by weight to 2% by weight % of magnesium; less than 0.01% by weight of copper; less than 0.05% by weight of manganese; less than 0.1% by weight of titanium; the balance of aluminum; and an unavoidable impurity; The heated aluminum billet, wherein the heating temperature of one of the heating treatments is 480°C to 500°C; the heated aluminum billet is subjected to a hot rolling treatment to obtain a rolled aluminum material, wherein one of the hot rolling treatments is finished at a rolling temperature of 310°C to 350°C; subjecting the finished rolled aluminum material to a cold-rolled treatment to obtain a cold-rolled aluminum material, wherein a reduction in the cold-rolled treatment is 75% to 87%; the cold-rolled aluminum A post-cold-rolled annealing treatment is carried out to obtain an annealed aluminum material, wherein the post-cold-rolling annealing treatment is a continuous annealing treatment or a batch-type annealing treatment, and one of the annealing temperatures of the continuous annealing treatment is greater than 400 °C and not greater than 460 °C, the annealing time of one of the continuous annealing treatments is less than 5 seconds, and the annealing temperature of one of the batch-type annealing treatments is 300 °C to 330 °C, and the annealing time of one of the batch-type annealing treatments is 1 hour to 4 hours; performing a post-annealing cold-rolling treatment on the annealed aluminum material to obtain a post-annealing cold-rolling aluminum material, wherein a reduction in the post-annealing cold-rolling treatment is 45% to 65%; and The annealed cold-rolled aluminum material is subjected to a finished annealing treatment to obtain the low lug ratio aluminum material, wherein the finished annealing treatment is a batch-type finished annealing treatment, and one of the annealing temperatures of the finished annealing treatment is 150°C to 250°C ℃, the annealing time of the finished product annealing treatment is 1 hour to 4 hours; and the cubic aggregate structure of the finished rolled aluminum material, the cold rolled aluminum material, the annealed aluminum material and the low lug ratio aluminum material is A strength ratio of a deformed collective structure is obtained by the following formula (I):

In formula (I), Cube, Goss, R-Cube, Cu, Br and S represent cube (Cube), Goss (Goss), R-cube (R-Cube), copper (Copper), brass ( Brass) and silver (Silver), and the strength ratio of the cubic aggregate and the deformed aggregate of the rolled aluminum material is 2 to 3. The method of manufacturing a low lug ratio aluminum material as claimed in claim 1, wherein the aluminum blank further contains no more than 0.04% by weight of chromium. The method of manufacturing a low lug ratio aluminum material according to claim 1, wherein a heating time of the heat treatment is 4 hours to 8 hours. The manufacturing method of the low lug ratio aluminum material as described in Claim 1, wherein after the hot rolling treatment, the manufacturing method of the low lug ratio aluminum material further comprises performing a hot-rolled post-coiling process on the finished rolled aluminum material step, to form a hot-rolled aluminum coil, and a thickness of the hot-rolled aluminum coil is 2mm to 5mm. The manufacturing method of the low lug ratio aluminum material according to claim 1, wherein the strength ratio of the cubic structure to the deformed structure of the cold-rolled aluminum material is 0.5 to 0.7. The manufacturing method of the low lug ratio aluminum material as described in Claim 1, wherein after the cold rolling treatment, the manufacturing method of the low lug ratio aluminum material further comprises performing a cold rolling back plate on the cold rolled aluminum material Coiling step, to form a cold-rolled aluminum coil, and a thickness of the cold-rolled aluminum coil is 0.3mm to 1.2mm. The manufacturing method of low lug ratio aluminum material according to claim 1, wherein the strength ratio of the cubic structure to the deformed structure of the annealed aluminum material is 0.7 to 1.2. The manufacturing method of the low lug ratio aluminum material as claimed in claim 1, wherein the strength ratio of the cubic texture to the deformed texture of the low lug ratio aluminum material is 0.2 to 0.4. A low lug ratio aluminum material, made by the manufacturing method of the low lug ratio aluminum material according to any one of claims 1 to 8, wherein the low protrusion Lug rate The lug rate of one of the aluminum materials is less than 2%.

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