CN116770203A - Method for reducing quenching deformation of 2024 aluminum alloy checkered plate coiled material - Google Patents
Method for reducing quenching deformation of 2024 aluminum alloy checkered plate coiled material Download PDFInfo
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- CN116770203A CN116770203A CN202310795531.3A CN202310795531A CN116770203A CN 116770203 A CN116770203 A CN 116770203A CN 202310795531 A CN202310795531 A CN 202310795531A CN 116770203 A CN116770203 A CN 116770203A
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- 230000000171 quenching effect Effects 0.000 title claims abstract description 111
- 238000010791 quenching Methods 0.000 title claims abstract description 110
- 229910001250 2024 aluminium alloy Inorganic materials 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000000463 material Substances 0.000 title claims abstract description 22
- 239000006104 solid solution Substances 0.000 claims abstract description 58
- 238000010438 heat treatment Methods 0.000 claims abstract description 45
- 239000007921 spray Substances 0.000 claims abstract description 30
- 238000000137 annealing Methods 0.000 claims abstract description 27
- 238000005097 cold rolling Methods 0.000 claims abstract description 14
- 238000004049 embossing Methods 0.000 claims abstract description 10
- 238000004321 preservation Methods 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 238000005266 casting Methods 0.000 claims abstract description 5
- 238000000265 homogenisation Methods 0.000 claims abstract description 4
- 238000005098 hot rolling Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 18
- 238000005507 spraying Methods 0.000 claims description 11
- 238000005096 rolling process Methods 0.000 claims description 8
- 238000005516 engineering process Methods 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 17
- 229910052782 aluminium Inorganic materials 0.000 abstract description 17
- 238000011282 treatment Methods 0.000 abstract description 8
- 239000000243 solution Substances 0.000 description 32
- 230000035882 stress Effects 0.000 description 29
- 229910000838 Al alloy Inorganic materials 0.000 description 9
- 229910045601 alloy Inorganic materials 0.000 description 7
- 239000000956 alloy Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 238000001953 recrystallisation Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910017818 Cu—Mg Inorganic materials 0.000 description 1
- 229910000737 Duralumin Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000002636 symptomatic treatment Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
The invention discloses a method for reducing quenching deformation of 2024 aluminum alloy checkered plate coiled materials, which relates to the technical field of aluminum processing treatment, and aims to solve the problem that a 2024 aluminum alloy checkered plate coiled material subjected to casting, homogenization heat treatment, hot rolling, cold rolling and cold rolling embossing is used as a blank for stress relief annealing, and is cooled to room temperature and then is subjected to uncoiling, three-stage solid solution heating furnace heating and heat preservation, quenching, straightening and curling coiling on a continuous heat treatment line. According to the invention, the 2024 aluminum alloy checkered plate is quenched by means of stress relief annealing before quenching, three-stage temperature zone setting of a solid solution section, quenching liquid with special concentration configuration, a convex spray quenching mode on the upper surface and a double-roller straightening mode immediately after spray quenching, so that a good plate shape is obtained, and continuous quenching of coiled materials is realized.
Description
Technical Field
The invention relates to the technical field of aluminum processing, in particular to a method for reducing quenching deformation of 2024 aluminum alloy checkered plate coiled materials.
Background
The 2xxx series aluminum alloy is a high-strength aluminum alloy taking copper as a main element, the high-strength obtaining is realized by later heat treatment, solution quenching-aging is the most common heat treatment mode of the 2xxx aluminum alloy, the process can lead to the formation of blank quenching residual stress, when the residual stress is large, the release and distribution of the residual stress in the subsequent machining process can lead to the deformation of a component, the deformation degree in reaction quenching is measured by the common quenching sensitivity on aluminum processing, and all heat treatments can strengthen the aluminum alloy to have certain quenching sensitivity, wherein the type and the content of the elements are the most important factors.
2024 aluminum alloy is a typical Al-Cu-Mg series duralumin aluminum alloy, has extremely high quenching sensitivity, and can generate serious quenching deformation when an aluminum alloy plate strip is quenched. On one hand, the residual stress of the later-stage material is seriously affected, and on the other hand, the deformation of the aluminum alloy coiled material is mainly caused by warping, twisting, bulging and wavy bending during quenching, so that the coiled material cannot be smoothly coiled due to quenching. The serious deformation of quenching is a main cause that 2024 aluminum alloy cannot be smoothly produced by a plurality of domestic factories, and is also an important technical bottleneck which puzzles the processing of 2xxx series aluminum alloy.
Wherein the quenching deformation degree of the 2024 aluminum alloy checkered plate is more serious than the deformation of the 2024 aluminum alloy flat plate. The protruding patterns on the surface of the checkered plate seriously influence the uniform deformation during solution hardening, and each protruding pattern is easy to cause stress concentration so as to cause non-uniformity during hardening deformation; on the other hand, the presence of the pattern affects the flow of quenching water, and the complexity of the pattern is positively correlated with the non-uniformity at the time of quenching, so that the high-strength 2024 aluminum alloy checkered plate has not been marketed until now, and the main reason is that the shortest plate of the 2024 aluminum alloy checkered plate is insufficient in "on-line quenching" capability.
Therefore, a method for reducing the quenching deformation of 2024 aluminum alloy checkered plate coiled materials is proposed to solve the above problems.
Disclosure of Invention
The invention aims at: solves the problems of serious deformation and poor plate shape of 2024 aluminum alloy checkered plates during quenching in the prior art.
The invention adopts the following technical scheme for realizing the purposes:
a method for reducing quenching deformation of 2024 aluminum alloy checkered plate coiled materials comprises the following steps of taking 2024 aluminum alloy checkered coiled materials subjected to casting, homogenization heat treatment, hot rolling, cold rolling and cold rolling embossing as blanks:
step one, stress relief annealing, namely performing stress relief annealing on the 2024 aluminum alloy patterned roll to obtain a first 2024 aluminum alloy patterned roll;
step two, uncoiling, namely cooling the first 2024 aluminum alloy patterned coil subjected to stress relief annealing in the step one to room temperature, and then uncoiling to obtain a second 2024 aluminum alloy patterned coil;
heating and preserving heat by a solid solution heating furnace, and heating and preserving heat by a third solid solution heating furnace to obtain a third 2024 aluminum alloy pattern coil;
step three, quenching, namely spraying and quenching the third 2024 aluminum alloy patterned roll to obtain a fourth 2024 aluminum alloy patterned roll;
step four, straightening, namely sequentially carrying out rough straightening and fine straightening on the fourth 2024 aluminum alloy patterned roll to obtain a fifth 2024 aluminum alloy patterned roll;
and fifthly, curling and rolling, namely curling and rolling the fifth 2024 aluminum alloy patterned roll into a sixth 2024 aluminum alloy patterned roll.
Further, the thickness of the blank is 2.00-6.35mm, the width is 1220-1524mm, the first 2024 aluminum alloy patterned coil in the second step faces upwards when being uncoiled, and the coil processing linear speed in the second to fifth steps is 0.5-3.5m/min.
Further, the solid solution heating furnace in the third step is divided into 9 temperature areas, and the temperature areas are sequentially divided into a first solid solution area, a second solid solution area and a third solid solution area along the inlet and outlet directions of the solid solution heating furnace for heating and heat preservation.
Further, the solid solution temperature of the primary solid solution zone is set to be 220-300 ℃, the solid solution temperature of the secondary solid solution zone is set to be 490+/-3 ℃, and the solid solution temperature of the tertiary solid solution zone is set to be 502+/-3 ℃.
Further, the first solid solution zone is the first temperature zone of the solid solution heating furnace temperature zone, and the second solid solution zone and the third solid solution zone respectively occupy half of the temperature of the rest solid solution heating furnace.
Further, spray quenching is adopted in the quenching in the third step, and the outlet distance between the spray quenching and the solid solution heating furnace is smaller than 200mm.
Further, the quenching medium for spray quenching consists of machine quenching liquid and water, the concentration is 5.0-5.5%, and the temperature of the quenching medium is 40-45 ℃.
Further, the stress relief annealing in the first step adopts common box annealing, the temperature of the common box annealing is 250-260 ℃, and the heat preservation time is 20-26 hours.
Further, the spray quenching is performed by adopting a flow convex technology, and the spray quenching mode is as follows:
the water spray amount along the center to the two ends in the width direction of the first 2024 aluminum alloy patterned coiled plate is gradually reduced at a certain ratio.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, by adding the destressing annealing process for 2024 aluminum alloy before continuous quenching, the internal stress generated in the cold rolling process can be released, the non-uniformity of stress in the width and length directions of the coiled material is reduced, the annealing process can not cause abnormal growth of metallographic structures in the plates in the subsequent continuous quenching process, and good pattern plate types can be obtained on the premise of keeping the plate structures and performances stable.
2. According to the invention, the temperature of the primary solid solution area is set to be 220-300 ℃, so that the dry watermark quality defect generated by sintering cold air outside the furnace on the plate surface due to the fact that the temperature of furnace gas is set to be too high at the inlet of the solid solution heating furnace can be effectively prevented.
3. According to the invention, through the temperature setting among the primary solid solution zone, the secondary solid solution zone and the tertiary solid solution zone, the occurrence degree of recrystallization can be reduced, the second phase particles are fully dissolved, the best effect can be obtained through solid solution treatment, and compared with the conventional single-stage 502 ℃ solid solution, the recrystallization degree is low, so that the grain structure after solid solution appears more uniform and finer.
4. According to the invention, by adopting different water spraying amounts for spray quenching, the aluminum plate can be cooled more uniformly along the width direction, so that the deformation degree of the quenched aluminum plate is effectively reduced, meanwhile, the quenching liquid is prepared by adding various surfactants into polyether polymer materials, and the defects of high water cooling speed, easiness in cracking of workpieces due to deformation, poor quenching effect, combustibility and the like are overcome due to the characteristic of water reverse solubility.
5. According to the invention, the 2024 aluminum alloy checkered plate is subjected to stress relief annealing before quenching, three-stage temperature zone setting of a solid solution section, quenching liquid with special concentration configuration, and double-roller straightening immediately after the upper surface is subjected to convex spray quenching mode stage quenching, so that a good plate shape is obtained after quenching and before coiling.
Drawings
FIG. 1 is a schematic diagram of a prior art spray quenched strip with uniform cooling;
FIG. 2 is a schematic diagram comparing the flow convexity technique of the present invention with the prior art using uniform cooling.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-2, a method for reducing quenching deformation of 2024 aluminum alloy checkered plate coiled material is to use 2024 aluminum alloy checkered coiled material after casting, homogenization heat treatment, hot rolling, cold rolling and cold rolling embossing as a blank, and the following steps are carried out:
step one, stress relief annealing, namely, stress relief annealing is carried out on the 2024 aluminum alloy patterned roll to obtain a first 2024 aluminum alloy patterned roll, and in actual production, attention is paid to distinguishing reasons of quenching deformation, namely, whether the quenching deformation is caused by residual stress or poor structure, and only then, symptomatic treatment can be carried out, and if the quenching deformation caused by the residual stress is caused, the stress relief annealing is carried out. The aim of reducing quenching deformation can be achieved only in this way, the quality is ensured, and because the rolling load of the pattern plate is much larger than that of the flat plate rolling in the cold rolling embossing stage, and because the protruding patterns on the surface increase the residual stress after cold rolling embossing, the analysis considers that the pretreatment should be carried out in a stress removing mode aiming at the characteristics of 2024 aluminum alloy cold rolling embossing. The reason is that during the cold working embossing process, larger residual stress is generated than that of the flat plate, and the uneven distribution of the raised patterns causes more serious deformation of the pattern plate during quenching. The coiled material after cold embossing is brittle and hard in cold rolling state, has extremely large internal stress after cold embossing, and has very uneven stress distribution in the width direction due to the existence of patterns. The continuous solution furnace has short heating time, and the stress of the cold-rolled coiled material can not be completely released in the heating process, and the rapid cooling during the additional quenching can generate huge stress after the quenching. The unreleased stress in the cold rolling state is overlapped with the stress vector generated by quenching, so that the stress in the width direction and the length direction of the plate is unbalanced, and serious plate shape failure is caused;
uncoiling, cooling to room temperature after stress relief annealing in the first step, and uncoiling on a continuous heat treatment line to obtain a second 2024 aluminum alloy patterned coil;
heating and preserving heat by a solid solution heating furnace, and heating and preserving heat by a third solid solution heating furnace to obtain a third 2024 aluminum alloy pattern coil; the purpose of the solution treatment is to obtain a supersaturated solid solution to a higher degree, so that coarse compound phases left in the casting process of the alloy are dissolved as much as possible, the traditional solution temperature is lower than the unbalanced low eutectic melting point, therefore, the coarse compound phases cannot be dissolved thoroughly, the solution temperature is increased as much as possible and the solution time is prolonged under the condition that no overburning is generated, but the recrystallization is also increased, the grain growth is unfavorable to the mechanical properties of the alloy, and the research finds that the low-temperature and high-temperature double-stage solution treatment can reduce the occurrence degree of the recrystallization and enable second-phase particles to be fully dissolved, so that the solution treatment can obtain the best effect.
Step three, quenching, namely spraying and quenching the third 2024 aluminum alloy patterned roll to obtain a fourth 2024 aluminum alloy patterned roll;
step four, straightening, namely sequentially carrying out rough straightening and fine straightening on the fourth 2024 aluminum alloy patterned roll to obtain a fifth 2024 aluminum alloy patterned roll, and adding an air knife before entering the rough straightening after quenching is finished so as to blow off residual liquid on the surface after quenching;
and fifthly, curling and rolling, namely curling and rolling the fifth 2024 aluminum alloy patterned roll into a sixth 2024 aluminum alloy patterned roll.
Example 1
Specifically, the thickness of the blank is 2.00mm, the width of the blank is 1220mm, when the first 2024 aluminum alloy patterned coil in the second step is uncoiled, the patterned surface is protected by facing upwards, and the coil processing linear speed in the second to fifth steps is 3m/min.
Specifically, in the third step, the solution heating furnace is divided into 9 temperature areas, the temperature areas are sequentially divided into a first-stage solution area, a second-stage solution area and a third-stage solution area along the inlet and outlet directions of the solution heating furnace for heating and heat preservation, the solution temperature of the first-stage solution area is set to 220 ℃, the solution temperature of the second-stage solution area is set to 490+/-3 ℃, the solution temperature of the third-stage solution area is set to 502+/-3 ℃, the first-stage solution area is the first temperature area of the solution heating furnace, and the second-stage solution area and the third-stage solution area respectively occupy half of the temperature of the rest solution heating furnace.
Specifically, spray quenching is adopted in the quenching in the step three, after solution treatment, 2024 aluminum alloy is subjected to solution treatment and then is subjected to rapid quenching to avoid precipitation, so that a solid solution with high supersaturation is obtained, a foundation is laid for improving the strength of the alloy by aging treatment, a certain time is needed for taking out an alloy sample from a solution furnace and transferring the sample into quenching liquid, the sample is subjected to air quenching for a period of time in the process, a certain amount of precipitated phase is precipitated in the alloy, the supersaturation degree of the alloy after solution is affected, and the performance of the alloy is greatly affected. The research shows that the quenching transfer time is very obvious for the quenching deformation of 2024 aluminum alloy, so that the outlet distance between the spray quenching and the solid solution heating furnace is set to be 180mm, a quenching medium of the spray quenching consists of machine quenching liquid and water, the concentration is 5.2%, the spray quenching temperature of the quenching medium is 40 ℃, the spray quenching is carried out by adopting a flow convex technology, and the spray quenching mode is as follows: the water spraying amount along the center to two ends in the width direction of the first 2024 aluminum alloy pattern rolled plate is gradually reduced at a certain ratio, as shown in fig. 2, the right side of fig. 2 is a schematic diagram of cooling by adopting a flow convex technology, the left side of fig. 2 is a schematic diagram of uniform cooling in the prior art, compared with the cooling effect of a plate strip obtained when cooling by adopting the flow convex technology, the cooling effect is better, the cooling effect is larger at two sides and smaller in the middle, the temperature is in a descending trend when the cooling is continuously quenched except that spray water directly sprayed out of a nozzle and performs convection heat exchange with a hot aluminum plate, the secondary cooling of cooling water which is deposited on the aluminum plate and flows along the horizontal direction exists, the water flow of the surface of the aluminum plate along the width direction is different, the water flow of the two sides is larger than the center, so that the cooling is uneven along the width direction as shown in fig. 1, when the strip is quenched, under the working condition that the header pipe is uniformly distributed and the water spraying amount is the same, the temperature is in the side part is in the descending trend when the width direction is far away from the center of the steel plate, and the temperature difference between the side and the center is larger. Therefore, the deformation of the edges of the strip material during quenching is emphasized, so that the shape of the edges is worse, and the scheme adopts a compensation method for different water spraying amounts along the width direction of the plate to make a transverse cooling curve of the aluminum plate, namely a distribution curve of the water spraying amounts of all headers in the width direction of the plate, as shown in figure 2, the water spraying amounts near two ends of the aluminum plate are gradually reduced in a certain ratio by using large water jet flow to impact the aluminum plate at the center of the aluminum plate, namely the water spraying amounts at the two transverse ends of the aluminum plate are reduced, and the water spraying amount at the center of the aluminum plate is increased, so that the uneven cooling of the aluminum plate along the width direction can be compensated, and the deformation degree of the shape of the aluminum plate is reduced.
Specifically, the stress relief annealing in the first step adopts common box annealing, the temperature of the common box annealing is 250 ℃, and the heat preservation time is 20 hours.
Example 2
Specifically, the thickness of the blank is 3.175mm, the width of the blank is 1486mm, and the coil processing line speed is 2.4m/min.
Specifically, the solid solution temperature of the primary solid solution zone is set to be 250 ℃.
Specifically, the concentration of the quenching medium for spray quenching is 5.0%, and the spray quenching temperature of the quenching medium is 43 ℃.
Specifically, the temperature of the common box annealing is 256 ℃, and the heat preservation time is 23 hours.
Example 3
Specifically, the thickness of the blank is 6mm, the width of the blank is 1512mm, and the coil processing linear speed is 0.7m/min.
Specifically, the solid solution temperature of the primary solid solution zone is set to 290 ℃.
Specifically, the concentration of the quenching medium for spray quenching is 5.5%, and the spray quenching temperature of the quenching medium is 45 ℃.
Specifically, the temperature of the common box annealing is 258 ℃, and the heat preservation time is 26 hours.
In embodiments 1-3, the solution temperature of the primary solution zone is adaptively adjusted according to actual production requirements, the temperature and the heat preservation time of the common box annealing are also increased along with the increase of the thickness of the blank, wherein the coil processing line speed is reduced along with the increase of the thickness of the blank, and in addition, in reality, the distance between the spray quenching and the solution heating furnace can be adjusted in practice for different production lines, and the distance is within 200mm.
For a billet of 3.175 thickness in example 2, the mechanical properties at 5 minutes just after quenching are as follows: tensile strength is 330MPa, and yield strength is about 140 MPa; the tensile strength can rise to about 380MPa after 1h, and can reach approximately 400MPa after 2h, the yield strength is obviously raised while the tensile strength is raised, so that the hardness is very fast raised in the first few hours after quenching, and the mechanical property of the aluminum alloy is rapidly increased along with the time increase just after quenching, and meanwhile, according to the characteristics of material straightening: the lower the material property (yield strength) is, the easier the straightening is, and the lower the property is, the easier the plate shape is improved; the plate is harder to flatten along with the improvement of the yield strength, and the analysis of the performance of the 2024 aluminum alloy checkered plate after quenching is more difficult to improve the plate shape along with the extension of time, so that two roller straightening machines are additionally arranged in the step four, the mode realizes the rough correction and the fine correction of the first time of the quenched aluminum plate strip in less than 5 minutes after coil quenching, and thoroughly improves the current situation of poor plate shape of the 2024 aluminum alloy checkered plate after quenching.
The present invention is not limited to the preferred embodiments, but the patent protection scope of the invention is defined by the claims, and all equivalent structural changes made by the specification and the drawings are included in the scope of the invention.
Claims (9)
1. A method for reducing quenching deformation of 2024 aluminum alloy checkered plate coiled materials is characterized in that 2024 aluminum alloy checkered coiled materials subjected to casting, homogenization heat treatment, hot rolling, cold rolling and cold rolling embossing are taken as blanks, and the following steps are carried out:
step one, stress relief annealing, namely performing stress relief annealing on the 2024 aluminum alloy patterned roll to obtain a first 2024 aluminum alloy patterned roll;
step two, uncoiling, namely cooling the first 2024 aluminum alloy patterned coil subjected to stress relief annealing in the step one to room temperature, and then uncoiling to obtain a second 2024 aluminum alloy patterned coil;
heating and preserving heat by a solid solution heating furnace, and heating and preserving heat by a third solid solution heating furnace to obtain a third 2024 aluminum alloy pattern coil;
step three, quenching, namely spraying and quenching the third 2024 aluminum alloy patterned roll to obtain a fourth 2024 aluminum alloy patterned roll;
step four, straightening, namely sequentially carrying out rough straightening and fine straightening on the fourth 2024 aluminum alloy patterned roll to obtain a fifth 2024 aluminum alloy patterned roll;
and fifthly, curling and rolling, namely curling and rolling the fifth 2024 aluminum alloy patterned roll into a sixth 2024 aluminum alloy patterned roll.
2. A method of reducing quenching distortion of 2024 aluminum alloy checkered plate coil as recited in claim 1, wherein: the thickness of the blank is 2.00-6.35mm, the width of the blank is 1220-1524mm, when the first 2024 aluminum alloy patterned coil in the second step is uncoiled, the patterned surface faces upwards, and the coil processing linear speed in the second to fifth steps is 0.5-3.5m/min.
3. A method of reducing quenching distortion of 2024 aluminum alloy checkered plate coil as recited in claim 1, wherein: the solid solution heating furnace in the third step is divided into 9 temperature areas, and the temperature areas are sequentially divided into a first solid solution area, a second solid solution area and a third solid solution area along the inlet and outlet directions of the solid solution heating furnace for heating and heat preservation.
4. A method of reducing quenching distortion of 2024 aluminum alloy checkered plate coil as claimed in claim 3, wherein: the solid solution temperature of the primary solid solution zone is set to be 220-300 ℃, the solid solution temperature of the secondary solid solution zone is set to be 490+/-3 ℃, and the solid solution temperature of the tertiary solid solution zone is set to be 502+/-3 ℃.
5. A method of reducing quenching distortion of a 2024 aluminum alloy checkered plate coil as recited in claim 4, wherein: the first solid solution zone is the first temperature zone of the solid solution heating furnace temperature zone, and the second solid solution zone and the third solid solution zone respectively occupy half of the temperature of the rest solid solution heating furnace.
6. A method of reducing quenching distortion of 2024 aluminum alloy checkered plate coil as recited in claim 1, wherein: and step three, spray quenching is adopted in the quenching, and the distance between the spray quenching and the outlet of the solid solution heating furnace is less than 200mm.
7. A method of reducing quenching distortion of 2024 aluminum alloy checkered plate coil as recited in claim 6, wherein: the quenching medium for spray quenching consists of machine quenching liquid and water, the concentration is 5.0-5.5%, and the temperature of the quenching medium is 40-45 ℃.
8. A method of reducing quenching distortion of 2024 aluminum alloy checkered plate coil as recited in claim 1, wherein: the stress relief annealing in the first step adopts common box annealing, the temperature of the common box annealing is 250-260 ℃, and the heat preservation time is 20-26h.
9. A method of reducing quenching distortion of 2024 aluminum alloy checkered plate coil as recited in claim 6, wherein: the spray quenching adopts a flow convex technology for spray quenching, and the spray mode is as follows:
the water spray amount along the center to the two ends in the width direction of the first 2024 aluminum alloy patterned coiled plate is gradually reduced at a certain ratio.
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| CN202310795531.3A CN116770203A (en) | 2023-06-30 | 2023-06-30 | Method for reducing quenching deformation of 2024 aluminum alloy checkered plate coiled material |
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| CN202310795531.3A CN116770203A (en) | 2023-06-30 | 2023-06-30 | Method for reducing quenching deformation of 2024 aluminum alloy checkered plate coiled material |
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| CN (1) | CN116770203A (en) |
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2023
- 2023-06-30 CN CN202310795531.3A patent/CN116770203A/en active Pending
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