TW202208648A - Aluminum plate and fabricating method thereof - Google Patents

Abstract

An aluminum plate and a fabricating method thereof are described. The fabricating method includes steps of: providing a raw material composition, wherein the raw material composition conforms to a composition ratio of an AA6XXX series aluminum alloy; performing an aluminum embryo forming step of forming an aluminum embryo by melt-casting the raw material composition; performing a hot-rolling step of hot-rolling the aluminum embryo to form a semi-processed aluminum plate with a thickness of 20 to 200 mm; performing a solid-solution and water quenching step of heating the semi-processed aluminum plate to 575~585 DEG C for 3~6 hours and of performing water quenching treatment on the semi-processed aluminum plate; performing a leveling step to flatten the semi-treated aluminum plate after the solid-solution and water quenching step; and performing an aging step to heat the flattened aluminum plate to 150 to 200 DEG C for 3 to 20 hours to obtain the aluminum plate.

Description

Aluminum plate and its manufacturing method

The present invention relates to the field of aluminum alloys, in particular to an aluminum plate and a manufacturing method thereof.

Products with a thickness greater than or equal to 6 mm are called aluminum sheets; products with a thickness of less than 6 mm are called aluminum sheets or coils. Aluminum sheets are mainly products formed from aluminum billets through a rolling process. Generally speaking, when the aluminum billet is melted and cast, the difference in the microstructure of the aluminum billet will be caused by the difference in the cooling rate between the surface and the center of the aluminum billet, and since the cutting amount of the aluminum plate in the thickness direction is smaller than that of the aluminum sheet or aluminum coil, even if various heat treatments are performed after rolling , there will still be precipitates with uneven size and uneven distribution density in the metallographic phase of the aluminum plate. The effect of these precipitates is that in the subsequent anodic treatment, selective corrosion will make the difference between the surface/center microstructure of the aluminum plate more obvious, thus forming anodic color streaks, resulting in uneven color appearance of the product.

In order to solve the above problems, the existing treatment method is to insert a homogenization treatment in the casting step and rolling step. However, this approach not only increases the time required for the manufacturing process, but also has limited effects on the above-mentioned technical problems.

Therefore, it is necessary to provide an aluminum plate and a manufacturing method thereof to solve the problems existing in the conventional technology.

One object of the present invention is to provide an aluminum plate and a method for manufacturing the same, which can reduce the size of the precipitates and make the precipitates smaller through steps using specific parameters (eg, solution treatment at 575-585° C. for 3 to 6 hours). The precipitation position is more average.

In order to achieve the above purpose, the present invention provides a method for manufacturing an aluminum plate, comprising the steps of: providing a raw material composition, wherein the raw material composition conforms to the composition ratio of AA6XXX series aluminum alloy; embryo; carry out a hot rolling step, the aluminum embryo is subjected to hot rolling treatment to form a semi-treated aluminum plate with a thickness of 20 to 200 mm; a solution and water quenching step is performed, and the semi-treated aluminum plate is heated to 575 ~ 585 ℃ for 3 to 6 hours, and the heated semi-treated aluminum plate is subjected to water quenching treatment; a flattening step is performed, and the semi-treated aluminum plate after the solid solution and water quenching steps is flattened; and an aging step is performed to heat the flattened aluminum plate. The semi-treated aluminum plate is heated to 150 to 200° C. for 3 to 20 hours to obtain the aluminum plate.

In an embodiment of the present invention, the total weight of the raw material composition is 100 wt %, and the raw material composition comprises: 95.85 to 98.56 wt % of aluminum; 0.8 to 1.2 wt % of magnesium; 0.4 to 0.8 wt % of aluminum; greater than zero and less than or equal to 0.7 wt% iron; 0.15 to 0.4 wt% copper; 0.04 to 0.35 wt% chromium; greater than zero and less than or equal to 0.7 wt% zinc; greater than zero and less than or equal to 0.25 wt% titanium; and greater than zero and less than or equal to 0.15 wt% of manganese.

In an embodiment of the present invention, the melting and casting temperature of the aluminum blank forming step is between 700°C and 800°C.

In an embodiment of the present invention, the thickness of the aluminum blank ranges from 400 to 600 mm.

In an embodiment of the present invention, the hot rolling temperature of the hot rolling step is between 450 and 500°C, and the finishing temperature of the hot rolling step is between 300 and 350°C.

In an embodiment of the present invention, the flattening step is to clamp the head end and the tail end of the semi-treated aluminum plate with clamps and apply tension in opposite directions, so as to flatten the semi-treated aluminum plate.

In an embodiment of the present invention, the homogenization step is not included between the aluminum billet forming step and the hot rolling step.

In an embodiment of the present invention, the temperature of the homogenization step is between 530 and 580° C., and the time of the homogenization step is between 8 and 20 hours.

In an embodiment of the present invention, the precipitate composition of the aluminum plate includes a Mg-Si-(CuTiCrMn) precipitate phase and a Mg ₂ Si precipitate phase, wherein the average size of the precipitate composition is between 1.0 and 1.4 microns.

In order to achieve the above-mentioned purpose, the present invention provides an aluminum plate, which is produced by the manufacturing method of the aluminum plate according to any one of the above-mentioned embodiments.

In order to make the above-mentioned and other objects, features and advantages of the present invention more clearly understood, the preferred embodiments of the present invention will be exemplified below and described in detail in conjunction with the accompanying drawings. Furthermore, the directional terms mentioned in the present invention, such as up, down, top, bottom, front, rear, left, right, inner, outer, side, surrounding, center, horizontal, lateral, vertical, longitudinal, axial, Radial, uppermost or lowermost, etc., are only directions with reference to the attached drawings. Therefore, the directional terms used are for describing and understanding the present invention, not for limiting the present invention.

Referring to FIG. 1, an embodiment of the present invention provides a method 10 for manufacturing an aluminum plate, including steps 11 to 16: providing a raw material composition, wherein the raw material composition conforms to the composition ratio of the AA6XXX series aluminum alloy (step 11); performing an aluminum blank forming step , the raw material composition is casted to form an aluminum blank (step 12); a hot rolling step is performed, and the aluminum blank is subjected to hot rolling to form a semi-treated aluminum plate with a thickness of 20 to 200 mm (step 13); and the water quenching step, heating the semi-treated aluminum plate to 575-585° C. for 3 to 6 hours, and subjecting the heated semi-treated aluminum plate to water quenching treatment (step 14); a leveling step is performed, and the solid solution and The semi-treated aluminum plate after the water quenching step is flattened (step 15 ); and an aging step is performed, and the flattened semi-treated aluminum plate is heated to 150 to 200° C. for 3 to 20 hours to obtain the aluminum plate (step 16 ). The present invention will hereinafter describe in detail the implementation details and principles of the above steps in the embodiments.

The manufacturing method 10 of an aluminum plate according to an embodiment of the present invention is firstly step 11 : providing a raw material composition, wherein the raw material composition conforms to the composition ratio of AA6XXX series aluminum alloy (step 11 ). In this step 11, the manufacturing method 10 of the aluminum plate of the present invention is mainly aimed at AA6XXX series aluminum alloys, such as AA6061 series aluminum alloys, but not limited thereto. In one embodiment, the total weight of the raw material composition is 100 wt %, and the raw material composition comprises: 95.85 to 98.56 wt % aluminum; 0.8 to 1.2 wt % magnesium; 0.4 to 0.8 wt % aluminum; greater than zero and less than 0.7 wt% iron; 0.15 to 0.4 wt% copper; 0.04 to 0.35 wt% chromium; greater than zero and less than or equal to 0.7 wt% zinc; greater than zero and less than or equal to 0.25 wt% titanium; and greater than zero and less than Equal to 0.15 wt% manganese. In one example, the feedstock composition may also contain 0 to 0.05 wt % of unavoidable impurities.

The manufacturing method 10 of an aluminum plate according to an embodiment of the present invention is followed by step 12 : performing the step of forming an aluminum blank, and forming an aluminum blank by melting and casting the raw material composition. In this step 12, any known melting and casting method can be used to form the aluminum blank. In one embodiment, the casting temperature of the aluminum blank forming step is between 700°C and 800°C, such as 710°C, 720°C, 730°C, 740°C, 750°C, 760°C, 770°C, 780°C or 790°C. °C. In another embodiment, the shape of the formed aluminum blank can be determined according to the mold and/or the needs of the user, for example, the aluminum blank is substantially a block, and the thickness of the aluminum blank is, for example, between 400 and 600 mm ( e.g. 410mm, 420mm, 430mm, 450mm, 470mm, 500mm, 520mm, 530mm, 540mm, 550mm, 570mm or 590mm).

The manufacturing method 10 of an aluminum sheet according to an embodiment of the present invention is followed by step 13 : performing a hot rolling step, and hot rolling the aluminum blank to form a semi-treated aluminum sheet with a thickness of 20 to 200 mm. In this step 13, the thickness of the aluminum billet is mainly reduced by hot rolling, so as to have the required thickness. In general, the desired thickness here can be substantially equal to or similar to the final thickness of the aluminum sheet. In one embodiment, the hot rolling temperature of the hot rolling step 13 is between 450 and 500°C, and the finishing temperature of the hot rolling step 13 is between 300 and 350°C.

The manufacturing method 10 of an aluminum plate according to an embodiment of the present invention is followed by step 14: performing solid solution and water quenching steps, heating the semi-treated aluminum plate to 575-585° C. for 3 to 6 hours, and heating the semi-treated aluminum plate Water quenched. In this step 14, the precipitation phase (Mg-Si-(CuTiCrMn) precipitation phase and Mg ₂ Si precipitation phase) in the semi-treated aluminum plate is mainly recovered by a relatively high solution temperature (575~585°C). Dissolved into aluminum alloy substrate. Specifically, in the conventional manufacturing method of aluminum sheet, in order to reduce the size of the above-mentioned precipitates or to make the distribution of the precipitates uniform, a homogenization treatment is usually adopted (a homogenization treatment is inserted in the casting step and the hot rolling step, wherein the homogenization step The temperature is between 530 and 580°C, and the time of the homogenization step is between 8 and 20 hours), and a lower solution temperature (500~560°C) is used in the solution and water quenching steps. °C for between 3 and 6 hours). However, the effect produced by the conventional method is still very limited (the specific experimental comparison will be described in the following paragraphs), and it takes a long time to process. It should be mentioned that at least one feature of the manufacturing method of the aluminum plate of the present invention is to use a higher solution temperature to redissolve the precipitation phases (Mg-Si-(CuTiCrMn) precipitation phase and Mg ₂ Si precipitation phase) into aluminum In the alloy substrate, the size of the above-mentioned precipitates is further reduced and/or the distribution of the precipitates is made uniform. Furthermore, the manufacturing method 10 of the present invention can eliminate the need to perform the conventional homogenization step (between the aluminum billet forming step and the hot rolling step), so the time required in the manufacturing process can also be saved. In another embodiment, the water quenching treatment may, for example, use normal temperature water (eg, between about 20 and 30° C.) to lower the temperature of the semi-treated aluminum sheet after the hot rolling treatment.

The manufacturing method 10 of an aluminum plate according to an embodiment of the present invention is followed by step 15: performing a leveling step, and leveling the semi-treated aluminum plate after the solid solution and water quenching steps. In this step 15 , since the semi-treated aluminum plate after the solid solution and water quenching steps will be bent due to thermal stress, a flattening step is required to return the semi-treated aluminum plate to a flat state. In one embodiment, the flattening step may, for example, clamp the head end and the tail end of the semi-treated aluminum plate with clamps and apply tension in opposite directions, so as to flatten the semi-treated aluminum plate.

The manufacturing method 10 of an aluminum plate according to an embodiment of the present invention finally is step 16 : performing an aging step, heating the flattened semi-treated aluminum plate to 150-200° C. for 3-20 hours to obtain the aluminum plate. In this step 16, for example, the temperature is maintained at 150°C for 16 to 20 hours; or the temperature is maintained at 200°C for 3 to 7 hours.

In addition, it should be mentioned that at least one feature of the manufacturing method 10 of an aluminum plate according to an embodiment of the present invention is to use a specific step process and match specific parameters to manufacture the aluminum plate. Because the precipitates in the aluminum plate have small size, uniform size distribution and uniform location distribution, the aluminum plate will not form anodic color difference stripes in the subsequent anodic treatment, so the problem of uneven color appearance of products in the prior art can be improved. .

In addition, at least one feature of the manufacturing method 10 of an aluminum plate according to an embodiment of the present invention is that the long-term homogenization process in the prior art is excluded. In other words, the present invention can omit the long-time homogenization treatment in the prior art by simply increasing the treatment temperature in the solution treatment, thereby saving the time required for producing the aluminum plate.

In addition, it should be mentioned that an embodiment of the present invention provides an aluminum plate, which can be manufactured by the manufacturing method of the aluminum plate in any of the above-mentioned embodiments.

The following examples and comparative examples are given to prove that the aluminum plate prepared by the manufacturing method of the aluminum plate of the embodiment of the present invention indeed has the above-mentioned effects.

Example 1

First, provide a raw material composition that conforms to the composition ratio of the AA6XXX series aluminum alloy. Here, the AA6061 series aluminum alloy is taken as an example (95.85 to 98.56 wt% of aluminum; 0.8 to 1.2 wt% of magnesium; 0.4 to 0.8 wt% of aluminum; greater than zero and less than or equal to 0.7 wt% iron; 0.15 to 0.4 wt% copper; 0.04 to 0.35 wt% chromium; greater than zero and less than or equal to 0.7 wt% zinc; greater than zero and less than or equal to 0.25 wt% titanium; and greater than zero and less than or equal to 0.15 wt% of manganese). After that, an aluminum blank forming step is performed at a casting temperature between 700 and 800° C. to form an aluminum blank with a thickness between 400 mm and 600 mm. Next, a hot rolling step is performed, and the aluminum blank is subjected to hot rolling treatment to form a semi-treated aluminum sheet with a thickness of 20 to 200 mm (the hot rolling temperature of the hot rolling step is, for example, between 450 and 500° C., and the The finishing temperature of the hot rolling step is, for example, between 300 and 350°C). Then, the steps of solid solution and water quenching are performed, the semi-treated aluminum plate is heated to 575-585° C. for 3 to 6 hours, and the heated semi-treated aluminum plate is subjected to water quenching treatment with normal temperature water. Next, a leveling step is performed, and the head end and the tail end of the semi-treated aluminum plate are respectively clamped with clamps and pulling force is applied in opposite directions, so as to level the semi-treated aluminum plate. Finally, an aging step is performed, and the flattened semi-treated aluminum plate is heated to 150 to 200° C. for 3 to 20 hours to obtain the aluminum plate.

Comparative Example 1

The manufacturing method of Comparative Example 1 is generally similar to that of Example 1, except that: (1) a homogenization step is also included between the aluminum billet forming step and the hot rolling step (the temperature of the homogenization step is, for example, between 530 and 530 °C). between 580° C., and the time of the homogenization step is, for example, between 8 and 20 hours); and (2) in the solution and water quenching steps, heating the semi-treated aluminum plate to 500-560° C. for 3 to 6 hours.

First of all, it should be noted that the manufacturing method of the aluminum plate of the present invention is mainly aimed at the Mg-Si-(CuTiCrMn) precipitation phase and the Mg ₂ Si precipitation phase. Please refer to Figures 2A to 2C, Figure 2A is a schematic microscopic analysis diagram of Example 1 after the aluminum blank is formed, Figure 2B is an enlarged view marked 21 in Figure 2A, Figure 2C is a diagram marked in Figure 2A Enlarged view of 22. It should be mentioned that Comparative Example 1 also has a similar distribution, and only Example 1 is shown here as an example. According to the analysis, during the cooling process of the aluminum blank, the eutectic structure of α-AlFeSi and β-AlFeSi like the shape of human nerves is first formed by solidification (as shown in Figure 2B, marked as 23). Plate-like Al(Fe)Si precipitates (as shown in Fig. 2B, marked 24) and punctate Mg-Si-(CuTiCrMn) precipitates (as shown in Fig. 2C, marked as 27), among which Mg-Si-(CuTiCrMn) The number does not change with the cooling rate. When the temperature was further lowered to 350°C, punctate Mg ₂ Si precipitates (as shown in Fig. 2C, marked 25) and fine needle-like Mg ₂ Si precipitates (as shown in Fig. 2C, marked 26) were produced, which slowed down with the cooling rate , the fine needle-like and point-like Mg ₂ Si turned into thick needle-like. It should be mentioned here that Mg-Si-(CuTiCrMn) precipitates and Mg ₂ Si precipitates are two types of precipitates that the present invention intends to dissolve back into the aluminum alloy substrate by means of high temperature solid solution.

Next, microscopic analysis was performed on Example 1 and Comparative Example 1 respectively, and the density and average size of the precipitates were quantitatively counted in a quantitative manner, and at the same time, it was observed whether the precipitates were uniformly distributed. Specifically, the microscopic analysis is carried out for different ratios of the aluminum plate from the center to the edge, for example, starting from the center point of the aluminum plate (hereinafter referred to as L/2, others and so on), moving along the length direction and performing microscopic analysis Measure until the edge of the aluminum plate (hereafter called 0 L, others and so on). Please refer to Figures 3A to 3D and Figures 4A to 4D, which are schematic diagrams of microscopic measurements at 0 L, L/8, L/4, and L/2 of Example 1, and Comparative Example 1, respectively. Schematic diagram of the microscopic measurement at 0 L, L/8, L/4 and L/2. Observing Figures 3A to 4D, the analysis results in Table 1 below can be obtained by quantitative calculation, wherein the density of micron-scale precipitates refers to the number of micron-scale precipitates per unit area, and the density of sub-micron-scale precipitates refers to is the number of submicron precipitates per unit area. For the range of micron and sub-micron, please refer to the definition in related fields. For example, micron generally refers to the range of 1 to 10 microns, and may be slightly larger than 10 microns, while sub-micron generally refers to the range of 0.1 to 1 micron. Probably slightly less than 0.1 microns. In principle, the order of magnitude between microscale and submicron scale as described herein refers to a difference of about 10 times or so.

Table 1 Location Density of micron-scale precipitates (10 ⁴ square microns) ^-1 Submicron-scale precipitate density (10 ⁴ square microns) ^-1 Average size of precipitates (microns) Example 1 0 L 12 twenty one 1.2 L/8 14 19 1.4 L/4 11 20 1.1 L/2 8 16 1.0 Comparative Example 1 0 L 20 35 1.8 L/8 twenty four 32 2 L/4 15 twenty one 1.6 L/2 9 17 1.5

It can be seen from the above table 1 that the average size of each position of Example 1 is smaller than that of each corresponding position of Comparative Example 1, and the density of precipitates at each position of Example 1 is also less than that of each corresponding position of Comparative Example 1. . In addition, as can be seen from Figs. 3A to 4D, the distribution of the precipitates at each position in Example 1 is also more uniform than that in Comparative Example 1.

In addition, Example 1 and Comparative Example 1 were further subjected to anodization, and the aluminum plate was observed macroscopically to see whether anodized streaks would occur. As shown in Figs. 5A and 5B, Example 1 did not produce anodic chromatic streaks, while Comparative Example 1 clearly produced anodic chromatic streaks. It is worth mentioning that the anode treatment can adopt the known anode treatment method for aluminum plates, so it is not repeated here.

According to the above analysis, it can be seen that the manufacturing method of the aluminum plate and the prepared aluminum plate of the embodiment of the present invention have the above-mentioned effects, and can also save the manufacturing time of the conventional technology.

Although the present invention has been disclosed with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be determined by the scope of the appended patent application.

10: Methods 11~16: Steps 21~27: Marking

FIG. 1 is a schematic flow chart of a manufacturing method of an aluminum plate according to an embodiment of the present invention. Figure 2A is a schematic microscopic analysis diagram of Example 1 after the formation of aluminum blanks. Figures 2B and 2C are enlarged views of the locations marked in Figure 2A. Figures 3A to 3D are schematic diagrams of microscopic measurement at 0 L, L/8, L/4 and L/2 of Example 1, respectively. Figures 4A to 4D are schematic diagrams of microscopic measurement at 0 L, L/8, L/4 and L/2 of Comparative Example 1, respectively. 5A and 5B are schematic photographs of Example 1 and Comparative Example 1 after anodizing treatment, respectively.

10: Methods

11~16: Steps

Claims (10)

A manufacturing method of an aluminum plate, comprising the steps: Provide raw material composition, wherein the raw material composition conforms to the composition ratio of AA6XXX series aluminum alloy; Carrying out the step of forming aluminum blanks, forming aluminum blanks by melting and casting the raw material composition; performing a hot rolling step, and hot rolling the aluminum blank to form a semi-treated aluminum sheet with a thickness of 20 to 200 mm; carrying out the steps of solid solution and water quenching, heating the semi-treated aluminum plate to 575-585° C. for 3 to 6 hours, and performing water quenching treatment on the heated semi-treated aluminum plate; performing a leveling step, and leveling the semi-treated aluminum plate after performing the solid solution and water quenching steps; and An aging step is performed, and the flattened semi-treated aluminum plate is heated to 150 to 200° C. for 3 to 20 hours to obtain the aluminum plate. The method for manufacturing an aluminum plate according to claim 1, wherein the total weight of the raw material composition is 100 wt %, and the raw material composition comprises: 95.85 to 98.56 wt % of aluminum; 0.8 to 1.2 wt % of magnesium; 0.4 to 0.8 wt % 0.15 to 0.4 wt% copper; 0.04 to 0.35 wt% chromium; greater than zero and 0.7 wt% zinc; greater than zero and 0.25 wt% titanium; and manganese greater than zero and less than or equal to 0.15 wt %. The manufacturing method of the aluminum plate according to claim 1, wherein the melting and casting temperature of the aluminum blank forming step is between 700 and 800°C. The manufacturing method of the aluminum plate according to claim 1, wherein the thickness of the aluminum blank is between 400 and 600 mm. The method for manufacturing an aluminum sheet according to claim 1, wherein the hot rolling temperature in the hot rolling step is between 450 and 500°C, and the finishing temperature in the hot rolling step is between 300 and 350°C. The method for manufacturing an aluminum plate as claimed in claim 1, wherein the flattening step is to clamp the head end and the tail end of the semi-treated aluminum plate with clamps and apply tension in opposite directions to flatten the semi-treated aluminum plate. The method for producing an aluminum sheet according to claim 1, wherein a homogenization step is not included between the aluminum billet forming step and the hot rolling step. The manufacturing method of the aluminum plate according to claim 7, wherein the temperature of the homogenization step is between 530 and 580°C, and the time of the homogenization step is between 8 and 20 hours. The method for manufacturing an aluminum sheet as claimed in claim 1, wherein the precipitate composition of the aluminum sheet comprises a Mg-Si-(CuTiCrMn) precipitate phase and a Mg ₂ Si precipitate phase, wherein the average size of the precipitate composition is between 1.0 and 1.4 between microns. An aluminum plate produced by the method for producing an aluminum plate according to any one of Claims 1 to 9.

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