CN115254955A - A kind of rolling method of aluminum alloy sheet - Google Patents

Abstract

The invention discloses a rolling method for an aluminum alloy sheet, which is characterized by comprising the following steps: S1. Taking aluminum alloy round bars or round ingots as raw materials, and thermally treating the raw materials; S2. Opening a hot rolling mill and placing the raw materials in Enter the roll for rolling; S3. After the raw material continues to be heat-insulated, put into the roll for rolling again; S4 repeats step S3 to obtain an aluminum alloy plate. The prepared aluminum alloy plate prepared by the invention has a smooth surface, no defects such as cracks, and has excellent performance, and can be used as an excellent raw material in various related fields. The rolling method has high preparation efficiency and low cost, and can realize industrialized production.

Description

A kind of rolling method of aluminum alloy sheet

technical field

The present invention relates to the technical field of aluminum alloy materials, and more specifically, relates to a rolling method of an aluminum alloy thin plate.

Background technique

Due to its low density, high specific strength and specific stiffness, good elasticity, good impact resistance, corrosion resistance, wear resistance, easy surface coloring, good processing formability and high recycling and regeneration, aluminum alloys are widely used in aviation. , aerospace, automobile, machinery manufacturing, shipbuilding, construction, decoration and other fields, its strength is generally between 480-500MPa. With the rapid development of science and technology and industrial economy in recent years, further improving the performance of aluminum alloy materials has become a common concern of the international aluminum industry. The implementation of the National Large Aircraft Plan puts forward higher requirements for the mechanical properties of high-strength, high-toughness, fatigue-resistant, and heat-resistant aluminum alloys. High-strength and high-toughness heat-resistant aluminum alloy sheets to meet the needs of the aviation industry for high-performance heat-resistant aluminum alloy sheets have become an urgent problem to be solved. Compared with aluminum alloy substrates produced by traditional die-casting and extrusion molding methods, rolled plates have higher production efficiency, more stable mechanical properties and higher plane accuracy. When using small-sized hard aluminum alloy slabs to produce ultra-wide aluminum alloy sheets, the production efficiency is low, the amount of width is insufficient, the production of ultra-wide plates is limited, and the yield rate is also low.

The Chinese invention patent with the notification number CN106637008 discloses a rolling method of a high-strength aluminum alloy plate, which includes the following steps: A. Homogenize and anneal the refined aluminum alloy ingot at 500-600°C; B. Control After the temperature is 390-410°C and the internal and external temperatures are uniform, perform a single-pass 15-20% hot rolling pre-deformation, continue to control the temperature at 390-410°C, and then carry out a single-pass 70-80% large-reduction rolling Deformation to obtain thick slabs, the thick slabs are water-cooled or air-cooled; C, solution treatment at 450-550°C for 0.5-2h, and then water quenching; D, 10-15h at 150-250°C Pre-aging treatment, and then air cooling to room temperature; E, carrying out single-pass 40-60% cold rolling deformation to obtain a plate, and then performing final aging treatment at 150-200°C for 3-5 hours. The above-mentioned rolling method solves the dendrite segregation problem of the plate through annealing treatment, homogenizes the composition of the aluminum alloy plate, improves the hardness of the alloy, improves the strength and service life of the aluminum alloy plate, but the annealing treatment operation is complicated, and it is difficult to realize large-scale industrialization Production, while the aluminum alloy sheet is easy to crack during the rolling process.

Contents of the invention

The purpose of the present invention is to address the deficiencies in the prior art, to provide a rolling method for aluminum alloy sheets, which is simple and quick to operate, low in cost, can greatly save time and can be produced in batches, and the surface of the prepared aluminum alloy sheets Smooth, no cracks.

The purpose of the present invention is as follows through the following technical solutions:

A method for rolling an aluminum alloy sheet, comprising the following steps:

S1. Use aluminum alloy round rods or round ingots as raw materials, and heat-insulate the raw materials;

S2. Turn on the hot rolling mill, put the raw materials into the rolls for rolling;

S3. After continuing the heat preservation treatment on the raw materials, put them into the rolls and roll them again;

S4. Step S3 is repeated to obtain an aluminum alloy plate. Further, the material of the round bar or round ingot described in step S1 is 2xxx aluminum alloy.

Further, the temperature of the heat preservation treatment in step S1 is 450-520°C.

Further, the temperature of the heat preservation treatment is 470°C or 490°C.

Further, the time for heat preservation treatment described in step S1 is 30 to 90 minutes

Further, the time of the heat preservation treatment is 60min.

Further, the heat preservation process is carried out in an electric furnace.

Further, the rotational speed of the roll is 200-1000r/min.

Further, the rotational speed of the roll is 200-600r/min.

Further, the roll gap between the rolls gradually decreases during the rolling process.

Compared with the prior art, the beneficial effects of the present invention are as follows:

The invention cooperates with the heat preservation treatment and the rolling process. During the rolling process, the amount of deformation increases continuously, the degree of recrystallization of the alloy becomes larger and larger, and finer short-axis crystals are obtained to maintain the high toughness of the material. During the rolling process, the aluminum alloy The board is not easy to crack.

The invention simplifies the rolling forming process of the aluminum alloy thin plate, is simple to operate, saves time and is highly efficient; the prepared aluminum alloy plate has a smooth surface, no defects such as cracks, excellent performance, and can be used as an excellent raw material in various related fields. The aluminum alloy plate rolling method of the invention has high preparation efficiency and low cost, and can realize industrialized production.

Description of drawings

Fig. 1 is a schematic flow sheet of an aluminum alloy sheet rolling method;

Fig. 2 is a schematic flow sheet of an aluminum alloy sheet rolling method;

Fig. 3 is the metallographic diagram of the aluminum alloy thin plate after rolling 6 times in embodiment 1;

Wherein, 1 is a roll, 2 is a roller table, and 3 is a raw material.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts all belong to the protection scope of the present invention.

Example 1

As shown in Figure 1, the present embodiment provides a rolling method of an aluminum alloy plate, comprising the following steps:

S1. Use 2024 aluminum alloy round rods as raw materials, and heat the raw materials in an electric furnace at a temperature of 490 ° C for 30 minutes;

S2. open hot rolling mill, raw material is put into roll and rolled, and roll speed is 400r/min, and the roll gap between roll is 19.28cm;

S3. put the raw material into the electric heating furnace again and carry out heat preservation treatment for 30min, put the roll gap between the rollers to be adjusted to 18.00cm, put into the roll and roll again;

Repeat the rolling steps until the aluminum alloy sheet reaches the desired thickness. Specifically, the subsequent rolling process in this embodiment is as follows:

S4. Put the raw material into the electric heating furnace again for heat preservation treatment for 25min, the heat preservation temperature is 480°C, adjust the roll gap between the rollers to 16.69cm, put into the rolls and roll again;

S5. Put the raw materials into the electric heating furnace again for heat preservation treatment for 25 minutes, the heat preservation temperature is 480°C, adjust the roll gap between the rollers to 15.22cm, put them into the rolls and roll again;

S6. Put the raw material into the electric heating furnace again for heat preservation treatment for 20min, the heat preservation temperature is 480°C, adjust the roll gap between the rollers to 13.96cm, put into the rolls and roll again;

S7. Put the raw material into the electric heating furnace again for heat preservation treatment for 20min, the heat preservation temperature is 480°C, adjust the roll gap between the rollers to 12.80cm, put into the rolls and roll again;

S8. Put the raw material into the electric heating furnace again for heat preservation treatment for 20 minutes, the heat preservation temperature is 480°C, adjust the roll gap between the rollers to 11.89cm, put it into the rolls and roll again;

S9. Put the raw material into the electric heating furnace again for heat preservation treatment for 20min, the heat preservation temperature is 470°C, adjust the roll gap between the rollers to 10.99cm, put it into the rolls and roll again;

S10. Put the raw material into the electric heating furnace again for heat preservation treatment for 20 minutes, the heat preservation temperature is 470°C, adjust the roll gap between the rollers to 9.94cm, put into the rolls and roll again;

S11. Put the raw materials into the electric furnace again for heat preservation treatment for 15 minutes, the heat preservation temperature is 470°C, adjust the roll gap between the rollers to 8.97cm, put them into the rolls and roll again;

S12. Put the raw materials into the electric furnace again for heat preservation treatment for 15 minutes, the heat preservation temperature is 470°C, adjust the roll gap between the rollers to 7.97cm, put them into the rolls and roll again;

S13. Put the raw material into the electric furnace again for heat preservation treatment for 10 minutes, the heat preservation temperature is 470°C, adjust the roll gap between the rollers to 7.01cm, put it into the rolls and roll again;

S14. Put the raw materials into the electric furnace again for heat preservation treatment for 10 minutes, the heat preservation temperature is 470°C, adjust the roll gap between the rollers to 6.06cm, put them into the rolls and roll again;

S15. Put the raw material into the electric heating furnace again for heat preservation treatment for 8 minutes, the heat preservation temperature is 470°C, adjust the roll gap between the rollers to 5.20cm, put it into the rolls and roll again;

S16. Put the raw material into the electric heating furnace again for heat preservation treatment for 8 minutes, the heat preservation temperature is 470°C, adjust the roll gap between the rollers to 4.43cm, put into the rolls and roll again;

S17. Put the raw material into the electric furnace again for heat preservation treatment for 5 minutes, the heat preservation temperature is 470°C, adjust the roll gap between the rollers to 3.55cm, put it into the rolls and roll again;

S18. Put the raw material into the electric furnace again for heat preservation treatment for 5 minutes, the heat preservation temperature is 470°C, adjust the roll gap between the rollers to 3.09cm, put it into the rolls and roll again;

S19. Put the raw materials into the electric furnace again for heat preservation treatment for 5 minutes, the heat preservation temperature is 470°C, adjust the roll gap between the rollers to 2.50cm, put them into the rolls and roll again;

S20. Put the raw material into the electric heating furnace again for heat preservation treatment for 5 minutes, the heat preservation temperature is 470°C, adjust the roll gap between the rollers to 1.99cm, put it into the rolls and roll again;

S21. Put the raw material into the electric heating furnace again for heat preservation treatment for 5 minutes, the heat preservation temperature is 470°C, adjust the roll gap between the rollers to 1.67cm, put it into the roll and roll again; until the aluminum alloy plate reaches the required thickness .

The roll gap during rolling and the actual thickness of the aluminum alloy sheet after rolling are shown in Table 1.

Table 1

The aluminum alloy sheet prepared in this example has a smooth surface, no defects such as cracks, and has good performance.

As shown in Figure 3, in this embodiment, the grain distribution in the aluminum alloy sheet after 6 passes of rolling presents a certain directionality, and after the heat preservation treatment is matched with the rolling process, the deformation As the amount increases, the degree of recrystallization of the alloy becomes larger and smaller, and smaller short-axis crystals are obtained.

The beneficial effects of this embodiment are as follows:

The invention cooperates with the heat preservation treatment and the rolling process. During the rolling process, the amount of deformation increases continuously, the degree of recrystallization of the alloy becomes larger and larger, and finer short-axis crystals are obtained to maintain the high toughness of the material. During the rolling process, the aluminum alloy The board is not easy to crack.

The invention simplifies the rolling forming process of the aluminum alloy thin plate, is simple to operate, saves time and is highly efficient; the prepared aluminum alloy plate has a smooth surface, no defects such as cracks, excellent performance, and can be used as an excellent raw material in various related fields. The aluminum alloy plate rolling method of the invention has high preparation efficiency and low cost, and can realize industrialized production.

Example 2

As shown in Figure 2, the present embodiment provides a rolling method of an aluminum alloy plate, comprising the following steps:

S1. Use 2A12 aluminum alloy round rods as raw materials, and heat the raw materials in an electric furnace at a temperature of 490°C for 90 minutes;

S2. open hot rolling mill, raw material is put into roll and rolled, and roll speed is 200r/min, and the roll gap between roll is 22.12cm;

Repeat the rolling steps until the aluminum alloy sheet reaches the desired thickness. Specifically, the subsequent rolling process in this embodiment is as follows:

S3. Put the raw material into the electric heating furnace again for heat preservation treatment for 30min, the heat preservation temperature is 490°C, adjust the roll gap between the rollers to 19.18cm, put into the rolls and roll again;

S4. Put the raw material into the electric heating furnace again for heat preservation treatment for 25min, the heat preservation temperature is 480°C, adjust the roll gap between the rollers to 17.2cm, put into the rolls and roll again;

S5. Put the raw material into the electric heating furnace again for heat preservation treatment for 25 minutes, the heat preservation temperature is 480°C, adjust the roll gap between the rollers to 15.37cm, put it into the rolls and roll again;

S6. Put the raw material into the electric heating furnace again for heat preservation treatment for 20min, the heat preservation temperature is 480°C, adjust the roll gap between the rollers to 13.57cm, put it into the rolls and roll again;

S7. Put the raw material into the electric heating furnace again for heat preservation treatment for 20 minutes, the heat preservation temperature is 480°C, adjust the roll gap between the rollers to 11.92cm, put into the rolls and roll again;

S8. Put the raw material into the electric heating furnace again for heat preservation treatment for 20min, the heat preservation temperature is 470°C, adjust the roll gap between the rollers to 9.98cm, put it into the rolls and roll again;

S9. Put the raw material into the electric heating furnace again for heat preservation treatment for 20min, the heat preservation temperature is 470°C, adjust the roll gap between the rollers to 8.76cm, put into the rolls and roll again;

S10. Put the raw materials into the electric furnace again for heat preservation treatment for 15 minutes, the heat preservation temperature is 470°C, adjust the roll gap between the rollers to 7.71cm, put them into the rolls and roll again;

S11. Put the raw materials into the electric furnace again for heat preservation treatment for 15 minutes, the heat preservation temperature is 470°C, adjust the roll gap between the rollers to 6.89cm, put them into the rolls and roll again;

S12. Put the raw material into the electric furnace again for heat preservation treatment for 10 minutes, the heat preservation temperature is 470°C, adjust the roll gap between the rollers to 5.82cm, put it into the rolls and roll again;

S13. Put the raw materials into the electric furnace again for heat preservation treatment for 10 minutes, the heat preservation temperature is 470°C, adjust the roll gap between the rollers to 5.08cm, put them into the rolls and roll again;

S14. Put the raw material into the electric heating furnace again for heat preservation treatment for 8 minutes, the heat preservation temperature is 470°C, adjust the roll gap between the rollers to 4.02cm, put it into the rolls and roll again;

S15. Put the raw material into the electric heating furnace again for heat preservation treatment for 8 minutes, the heat preservation temperature is 470°C, adjust the roll gap between the rollers to 3.37cm, put it into the rolls and roll again;

S16. Put the raw material into the electric heating furnace again for heat preservation treatment for 5 minutes, the heat preservation temperature is 470°C, adjust the roll gap between the rollers to 2.42cm, put it into the rolls and roll again;

S17. Put the raw materials into the electric heating furnace again for heat preservation treatment for 5 minutes, the heat preservation temperature is 470°C, adjust the roll gap between the rollers to 1.71cm, put them into the rolls and roll again;

S18. Put the raw materials into the electric heating furnace again for heat preservation treatment for 5 minutes, the heat preservation temperature is 470°C, adjust the roll gap between the rollers to 1.26cm, put them into the rolls and roll again; until the aluminum alloy plate reaches the required thickness .

The roll gap during rolling and the actual thickness of the aluminum alloy sheet after rolling are shown in Table 2.

Table 2

Rolling times 0 1 2 3 4 5 6 Roll gap/cm 22.12 19.18 17.2 15.37 13.57 11.92 9.98 Actual thickness/cm 22.92 20.08 17.62 15.84 13.92 12.31 10.46 Rolling times 7 8 9 10 11 12 13 Roll gap/cm 8.76 7.71 6.89 5.82 5.08 4.02 3.37 Actual thickness/cm 9.26 8.22 7.38 6.33 5.62 4.52 4.15 Rolling times 14 15 16 Roll gap/cm 2.42 1.71 1.26 Actual thickness/cm 3.01 2.4 1.76

The aluminum alloy sheet prepared in this example has a smooth surface, no defects such as cracks, and has good performance.

As shown in Figure 2, for the present invention, also can adopt the mode of continuous rolling to carry out rolling aluminum alloy plate, after two rounds of rolling, carry out thermal insulation treatment to aluminum alloy plate again, further improved production efficiency, rolling process The roll gap between the middle rolls gradually decreases; the size of the roll gap between the rolls can be adjusted according to the actual thickness required for the aluminum alloy sheet.

The beneficial effects of this embodiment are as follows:

The invention cooperates with the heat preservation treatment and the rolling process. During the rolling process, the amount of deformation increases continuously, the degree of recrystallization of the alloy becomes larger and larger, and finer short-axis crystals are obtained to maintain the high toughness of the material. During the rolling process, the aluminum alloy The board is not easy to crack.

The invention simplifies the rolling forming process of the aluminum alloy thin plate, is simple to operate, saves time and is highly efficient; the prepared aluminum alloy plate has a smooth surface, no defects such as cracks, excellent performance, and can be used as an excellent raw material in various related fields. The aluminum alloy plate rolling method of the invention has high preparation efficiency and low cost, and can realize industrialized production.

Example 3

The aluminum alloy plates prepared in Examples 1 and 2 are tested for tensile strength and elongation, and the test results are shown in

table 3.

Tensile strength (MPa) Elongation(%) Example 1 449 13.5 Example 2 480 12.4

It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present invention, the directional indication is only used to explain the position in a certain posture (as shown in the accompanying drawing). If the specific posture changes, the directional indication will also change accordingly.

In addition, if there are descriptions involving "first", "second" and so on in the embodiments of the present invention, the descriptions of "first", "second" and so on are only for descriptive purposes and should not be interpreted as indicating or implying Its relative importance or implicitly indicates the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , nor within the scope of protection required by the present invention.

Claims (10)

1. a rolling method of aluminum alloy sheet, is characterized in that, comprises the following steps: S1. Use aluminum alloy round rods or round ingots as raw materials, and heat-insulate the raw materials; S2. Turn on the hot rolling mill, put the raw materials into the rolls for rolling; S3. After continuing the heat preservation treatment on the raw materials, put them into the rolls and roll them again; S4. Step S3 is repeated to obtain an aluminum alloy plate. 2 . The rolling method of aluminum alloy sheet according to claim 1 , wherein the material of the round bar or ingot in step S1 is 2xxx aluminum alloy. 3 . 3 . The rolling method of aluminum alloy sheet according to claim 1 , characterized in that, the temperature of the heat preservation treatment in step S1 is 450-520° C. 4. The method for rolling aluminum alloy sheets according to claim 3, characterized in that the temperature of the heat preservation treatment is 470°C or 490°C. 5. The method for rolling an aluminum alloy thin plate according to claim 1, characterized in that the time for the heat preservation treatment in step S1 is 30-90 minutes. 6. The rolling method of aluminum alloy sheet according to claim 1, characterized in that, the time for the heat preservation treatment is 60 minutes. 7. The method for rolling an aluminum alloy thin plate according to any one of claims 3-6, characterized in that, the heat preservation process is carried out in an electric furnace. 8 . The method for rolling an aluminum alloy thin plate according to claim 1 , wherein the rotational speed of the roll is 200-1000 r/min. 9. The method for rolling an aluminum alloy thin plate according to claim 8, characterized in that the rotational speed of the roll is 200-600 r/min. 10. The method for rolling an aluminum alloy thin plate according to claim 1, characterized in that the roll gap between the rolls gradually decreases during the rolling process.

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