An ultra-wide and ultra-long aluminum alloy thick plate and a method for manufacturing the same

Abstract

This invention relates to the field of aluminum alloy rolling, specifically to an ultra-wide and ultra-long aluminum alloy thick plate and its preparation method. The preparation method of the ultra-wide and ultra-long aluminum alloy thick plate provided by this invention includes the following steps: aluminum ingots are sequentially subjected to a first rolling, head and tail trimming, and a second rolling, followed by direct blanking to obtain an ultra-wide and ultra-long aluminum alloy thick plate; the final rolling temperature of the first rolling is above 370℃ and below 390℃; the final rolling temperature of the second rolling is above 300℃ and below 350℃. This invention targets ultra-wide and ultra-long aluminum alloy thick plates with a width of 3400mm or more and a length of 15000mm or more. Compared with existing technologies, the surface condition of the obtained plates is good, and the performance is not significantly reduced. The yield strength of the plates obtained by the above method is 184MPa~196MPa; the tensile strength is 331MPa~339MPa; and the elongation is 17%~21%.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy rolling, specifically to an ultra-wide and ultra-long aluminum alloy thick plate and its preparation method. Background Technology

[0002] Due to the unique properties of ultra-wide (≥3400mm) and ultra-long (≥15000mm) aluminum alloy sheets, there are currently few domestic manufacturers capable of producing them. Even among those that can produce them, many problems exist, such as sheet shape and surface quality. Therefore, ultra-wide and ultra-long aluminum alloy sheets are products with significant production challenges, and how to produce ultra-wide and ultra-long aluminum alloy sheets that meet quality requirements remains an industry-wide challenge.

[0003] Currently, the rolling mill used in large-scale production is a 4300mm rolling mill (with tapered rolls). The equipment mainly includes the rolling mill, shearing machine, and blanking machine, forming an integrated rolling, shearing, and blanking system. However, due to the large dimensions of ultra-wide and ultra-long aluminum alloy plates, if the existing rolling methods, tooling, and personnel allocation are still used, severe scratches and oil stains will appear on the surface of these plates. Common solutions include increasing the frequency of cleaning and the wiping methods (primarily removing aluminum shavings, burrs, and dirt), such as: ① changing the cleaning frequency of the roller conveyor from pre-shift cleaning to cleaning before each production run; ② changing the wiping tools, such as replacing mops with cloths. However, these two methods have limited effectiveness in improving the surface scratches and oil stains of ultra-wide (≥3400mm) and ultra-long (≥15000mm) aluminum alloy plates, and still cannot meet customer requirements. Summary of the Invention

[0004] In view of this, the technical problem to be solved by the present invention is to provide an ultra-wide and ultra-long aluminum alloy thick plate and a method for preparing the same. The preparation method provided by the present invention can reduce the occurrence of surface defects in the final plate without negatively affecting the performance of the final plate.

[0005] This invention provides a method for preparing ultra-wide and ultra-long aluminum alloy thick plates, comprising the following steps:

[0006] The aluminum ingot is rolled in sequence, the head and tail are cut off, and then rolled in a second time before being directly cut into material to obtain ultra-wide and ultra-long aluminum alloy thick plates.

[0007] The final rolling temperature of the first rolling process is above 370°C and below 390°C.

[0008] The final rolling temperature of the second rolling process is above 300°C and below 350°C.

[0009] The inventors of this application have creatively discovered that, for the preparation of ultra-wide and ultra-long aluminum alloy thick plates with a width of 3400 mm or more and a length of 15000 mm or more, by reducing the final rolling temperature and the number of rolling passes in the two rolling processes, it is possible to reduce the occurrence of surface defects in the final plate without negatively impacting the performance of the final plate.

[0010] The final rolling temperature of the first rolling process in this invention is above 370°C and below 390°C, preferably 370°C to 380°C; the final rolling temperature of the second rolling process is above 300°C and below 350°C, preferably 300°C to 340°C. In some embodiments, the final rolling temperature of the first rolling process is 371°C to 380°C; the final rolling temperature of the second rolling process is 312°C to 340°C. In one embodiment, the final rolling temperature of the first rolling process is 379°C; the final rolling temperature of the second rolling process is 335°C. Compared with the prior art, this invention reduces the final rolling temperature of the two rolling processes, especially reducing the final rolling temperature of the second rolling process to below 350°C, which improves the hardness of the sheet, optimizes the sheet shape, avoids surface quality defects caused by the sheet shape problem of the middle of the sheet width sagging, and reduces the contact area between the sheet and the rolls, thereby reducing the probability of scratches on the sheet.

[0011] The first rolling process of this invention consists of 13 to 15 rolling passes; the second rolling process consists of 2 to 4 rolling passes. In one embodiment, the first rolling process consists of 13 rolling passes; the second rolling process consists of 2 rolling passes. Compared with the prior art, this invention reduces the number of rolling passes in two rolling processes, which not only does not negatively affect the performance of the final sheet material, but also reduces the number of frictions between the sheet material and the rolls, thus lowering the probability of scratches on the sheet material.

[0012] This invention includes head and tail trimming between the first and second rolling processes. The invention does not impose any particular limitation on the head and tail trimming method, which is well-known to those skilled in the art. In some embodiments of this invention, the aluminum ingot is composed of 5083 aluminum alloy, 5A06 aluminum alloy, or 1561 aluminum alloy. In some embodiments of this invention, the aluminum ingot is composed of 5083 aluminum alloy.

[0013] This invention involves sequentially rolling an aluminum ingot, trimming its ends, and then rolling it a second time before directly cutting it into sheet metal. Specifically, the direct cutting means that the sheet metal after the second rolling is not sheared by a shearing machine, but is cut directly in front of it. Traditionally, sheet metal is fed in a 1:x ratio (1 ingot: x sheet metal), requiring trimming of the ends and setting the final length before cutting. In this invention, the sheet metal is fed in a 1:1 ratio (1 ingot: 1 sheet metal), eliminating the need for pre-sizing. Therefore, trimming is unnecessary before cutting after the second rolling; the ends can be trimmed during the final sawing. Compared to existing technologies, this invention addresses the characteristics of ultra-wide and ultra-long aluminum alloy sheets, breaking with conventional thinking and changing the traditional sheet metal cutting method. By altering the cutting position, it reduces the contact between the rolled sheet metal and the shearing machine, further lowering the probability of scratches.

[0014] Before each production run of aluminum ingots, this invention can further reduce the damage or contamination of the plate surface by increasing the number of times the rollers are cleaned, the cleaning intensity, and the number of cleaning personnel. For example, the original method of cleaning the roller conveyor and wiping the rollers with a mop before each shift is changed to a method of cleaning the roller conveyor and wiping the rollers with a mop with a 5-person operation and a 2-person inspection.

[0015] This invention also provides an ultra-wide and ultra-long aluminum alloy thick plate obtained by the above method. Specifically, the aluminum alloy thick plate obtained by the above method has a width of 3400 mm or more and a length of 15000 mm or more. More specifically, the aluminum alloy thick plate obtained by the above method has a width of 3400 mm to 3500 mm, a length of 15000 mm to 16000 mm, and a thickness of 30 mm to 40 mm. In one embodiment, an aluminum alloy thick plate with a width of 3400 mm and a length of 15000 mm is obtained by the above method. In another embodiment, an aluminum alloy thick plate with a width of 3400 mm and a length of 15500 mm is obtained by the above method.

[0016] This invention provides an ultra-wide and ultra-long aluminum alloy thick plate and its preparation method. The preparation method of this invention is for ultra-wide and ultra-long aluminum alloy thick plates with a width of 3400 mm or more and a length of 15000 mm or more. Compared with existing technologies, the obtained ultra-wide and ultra-long aluminum alloy thick plates have good surface conditions and no significant decrease in performance. In some embodiments of this invention, the yield strength of the ultra-wide and ultra-long aluminum alloy thick plates obtained by the above method is 184 MPa to 196 MPa; the tensile strength is 331 MPa to 339 MPa; and the elongation is 17% to 21%.

[0017] This invention significantly improves surface defects such as scratches and oil stains on the sheet metal through meticulous management of the rolling process, meeting customer requirements. The preparation method of this invention features meticulous control throughout the entire process, optimizing production operations. It is simple and effective, improving product surface quality without compromising performance, only increasing personnel and time costs. It solves the production challenges of ultra-wide (≥3400mm) and ultra-long (≥15000mm) aluminum alloy sheets, achieving high returns with low cost. Attached Figure Description

[0018] Figure 1 This is an appearance view of the plate material prepared by the method described in this invention;

[0019] Figure 2 This is an appearance view of the sheet material obtained by the method described in the comparative example of the present invention. Detailed Implementation

[0020] This invention discloses an ultra-wide and ultra-long aluminum alloy thick plate and its preparation method. Those skilled in the art can refer to the content of this document and appropriately modify the process parameters to achieve the desired result. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art and are considered to be included in this invention. The methods and applications of this invention have been described through preferred embodiments, and those skilled in the art can obviously make modifications or appropriate alterations and combinations to the methods and applications described herein without departing from the content, spirit, and scope of this invention to realize and apply the technology of this invention.

[0021] The present invention will be further described below with reference to the embodiments:

[0022] Examples 1-9

[0023] After the ingot is heated and taken out of the furnace, it is subjected to a first plate rolling process, which consists of 13 to 15 passes and a final rolling temperature of 370 to 380°C.

[0024] After the first rolling of the sheet is completed, the head and tail are cut off, and then the sheet is rolled a second time. The second rolling of the sheet has 2 to 4 passes, and the final rolling temperature of the second rolling is 300 to 340°C.

[0025] After the second rolling of the sheet metal is completed, it is directly unloaded before reaching the shearing machine. The unloading position is next to the rolling mill used for the second rolling of the sheet metal, resulting in ultra-wide and ultra-long aluminum alloy sheets.

[0026] The final rolling temperature, number of passes for the first rolling of the sheet metal in Examples 1-9, and the final rolling temperature and number of passes for the second rolling of the sheet metal are shown in Table 1.

[0027] Table 1

[0028]

[0029] Comparative Examples 1-9

[0030] After the ingot is removed from the furnace, it undergoes a first plate rolling process, which consists of 17 to 19 passes and a final rolling temperature of 390 to 400°C.

[0031] After the first rolling of the sheet is completed, the head and tail are cut off, and then the sheet is rolled a second time. The second rolling of the sheet consists of 3 to 5 passes, and the final rolling temperature of the second rolling is 350 to 370°C.

[0032] After the second rolling of the sheet metal is completed, the head and tail are cut off again, and then the sheet metal is cut off by a blanking machine to obtain ultra-wide and ultra-long aluminum alloy sheets in proportions 1 to 9.

[0033] Table 2 shows the final rolling temperature, number of passes for the first rolling of the plates in Comparative Examples 1–9, and the final rolling temperature and number of passes for the second rolling of the plates.

[0034] Table 2

[0035]

[0036] The parameters and mechanical properties of the ultra-wide and ultra-long aluminum alloy sheets obtained in Examples 1-9 and Comparative Examples 1-9 are shown in Table 3:

[0037] Table 3

[0038]

[0039]

[0040] Note: O indicates that the materials have the same heat treatment state.

[0041] Upon inspection, the plates obtained in Examples 1-9 showed only minor scratches and oil stains on the wide edges, and the area and number of scratches and oil stains were small (they could be removed after trimming, with each side cut 50mm). In contrast, the plates obtained in Comparative Examples 1-9 showed scratches on both the wide edges and the middle of the plate, exhibiting a continuous strip-like morphology along the rolling direction, and numerous large areas of oil stains. Figures 1-2 As shown, Figure 1 This is an appearance view of the plate material prepared by the method described in this invention. Figure 2 This is an appearance drawing of the sheet metal obtained by the method described in the comparative example of the present invention. Figure 1 It is evident that the board material prepared by the method described in this invention has no scratches or only slight scratches, while... Figure 2It can be seen that the board material prepared by the method described in the comparative example of the present invention has obvious scratches and oil spots. Based on the visual inspection results and the above performance test results, it can be concluded that the preparation method provided by the present invention reduces the occurrence of surface defects in the final board material without negatively impacting its performance.

[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for preparing ultra-wide and ultra-long aluminum alloy thick plates, characterized in that, Includes the following steps: The aluminum ingot is subjected to a first rolling, head and tail trimming, and a second rolling before being directly cut into blanks to obtain ultra-wide and ultra-long aluminum alloy plates with a width of over 3400 mm, a length of over 15000 mm, and a thickness of 30 mm to 40 mm; the aluminum ingot is made of 5083 aluminum alloy, 5A06 aluminum alloy, or 1561 aluminum alloy. The final rolling temperature of the first rolling is 370~379℃; the number of rolling passes in the first rolling is 13~15. The final rolling temperature of the second rolling is 300~340℃; the number of rolling passes in the second rolling is 2~4.

2. The ultra-wide and ultra-long aluminum alloy thick plate obtained by the method according to claim 1.

3. The ultra-wide and ultra-long aluminum alloy thick plate according to claim 2, characterized in that, Its width is 3400 mm to 3500 mm and its length is 15000 mm to 16000 mm.

4. The ultra-wide and ultra-long aluminum alloy thick plate according to claim 2, characterized in that, Its yield strength is 184 MPa~196 MPa; Its tensile strength is 331 MPa~339 MPa; Its elongation rate is 17%~21%.

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