CN115948668A - Manufacturing method of high-strength heat-treatment strengthenable aluminum alloy plate quenched in air cushion furnace - Google Patents
Manufacturing method of high-strength heat-treatment strengthenable aluminum alloy plate quenched in air cushion furnace Download PDFInfo
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Abstract
The invention discloses a manufacturing method of a high-strength heat treatment strengtheneable aluminum alloy plate quenched by an air cushion furnace, and relates to the technical field of high-strength heat treatment strengtheneable aluminum alloy plates manufactured by aluminum alloy belt quenching and belt cold hardening. The invention aims to solve the technical problem that the mechanical property of the existing aluminum alloy plate needs to be improved. The manufacturing method comprises the following steps: weighing raw materials and an aluminum alloy solution, casting, carrying out homogenization annealing treatment, milling a surface, coating aluminum, heating, hot rolling, cold rolling, cleaning and trimming, solution quenching and deformation treatment, natural aging, cold work hardening and shearing. The high-strength heat treatment manufactured by quenching in an air cushion furnace and performing cold work hardening by a belt method in a cold rolling mill can strengthen the qualified surface quality, shape and mechanical property of the aluminum alloy plate and has stable quality. The comprehensive requirements of the high-strength heat-treatment strengthenable aluminum alloy plate are met, and the manufacturing method is suitable for preparing the high-strength heat-treatment strengthenable aluminum alloy plate for air cushion furnace quenching.
Description
Technical Field
The invention relates to the technical field of high-strength heat treatment strenthenable aluminum alloy plates manufactured by aluminum alloy belt quenching and belt cold-work hardening.
Background
The aluminum alloy has the characteristics of small density, high strength, good fatigue resistance, excellent processing performance and the like, and along with the continuous development and progress of aluminum alloy processing technology, the high-strength heat treatment which has good surface quality, plate shape and mechanical property stability can strengthen the aluminum alloy plate and is widely applied in certain key fields. The air cushion furnace is a more typical advanced aluminum alloy heat treatment production line in the current aluminum alloy processing industry, has the characteristics of high furnace gas temperature uniformity, continuous operation, low energy consumption, high safety, uniform and stable product quality and the like, has a new breakthrough in the aspect of ensuring the comprehensive quality of products, is matched with the processing mode of cold work hardening of a modern high-speed belt type cold rolling mill, and is a development direction of high-quality and high-strength heat treatment for strengthening aluminum alloy plates. Therefore, a manufacturing method of the high-strength heat treatment strengtheneable aluminum alloy plate quenched by the air cushion furnace is developed.
Disclosure of Invention
The invention provides a manufacturing method of a high-strength heat treatment strengtheneable aluminum alloy plate quenched by an air cushion furnace, aiming at solving the technical problem that the mechanical property of the existing aluminum alloy plate needs to be improved.
A manufacturing method of a high-strength heat treatment strengtheneable aluminum alloy plate quenched in an air cushion furnace comprises the following steps:
1. according to the weight percentage: 4.55 to 4.85 percent of Cu, 0.50 to 0.80 percent of Mn, 1.50 to 1.80 percent of Mg, less than 0.27 percent of Si, less than 0.45 percent of Fe, less than 0.10 percent of Ni, less than 0.20 percent of Zn, less than 0.10 percent of Ti and the balance of Al, weighing a copper ingot, an aluminum-manganese intermediate alloy, a magnesium ingot and an aluminum ingot, and then weighing the copper ingot, the aluminum-manganese intermediate alloy, the magnesium ingot and the aluminum ingot;
adding the weighed aluminum ingot into a resistance reflection furnace, heating to 750-795 ℃, adding metal copper into the resistance reflection furnace, stirring for 6-10 min, and keeping the melt temperature at 750-795 ℃ during stirring; then adding magnesium ingot, stirring for 7-10 min, adding aluminum-manganese intermediate alloy, and stirring for 12-15 min;
with Ar-Cl 2 Refining the mixed gas for 6-10 min, and covering with a flux to obtain an alloy melt; introducing the alloy melt into a standing furnace of a resistance reverberatory furnace at 735-765 ℃, and introducing Ar-Cl 2 Refining the mixed gas for 9-14 min, standing for 10-23 min, and then performing semi-continuous casting under the conditions that the casting speed is 32-40 mm/min, the casting temperature is 720-740 ℃, and the casting cooling water pressure is 0.03-0.08 MPa to obtain an ingot;
2. carrying out homogenization annealing treatment on the ingot obtained in the step one;
3. performing surface milling treatment on the cast ingot treated in the step two;
4. performing double-sided aluminum coating on the cast ingot treated in the step three;
5. heating the cast ingot treated in the step four, controlling the temperature of furnace gas to be 525-535 ℃, heating for 9.0-9.5 h, rotating to a fixed temperature of 465-475 ℃, and discharging;
6. carrying out hot rolling on the cast ingot treated in the fifth step to obtain a hot rolled coil;
7. cold rolling the hot rolled coil obtained in the sixth step to obtain a cold rolled coil;
8. cleaning and trimming the cold-rolled coil obtained in the step seven to obtain a coiled material;
9. quenching the coiled material obtained in the step eight by adopting an air cushion furnace, controlling the temperature of the furnace to be 497-503 ℃ and the speed of the process section to be 3.4-3.6 m/min, quenching by adopting water at 15-35 ℃, and controlling the pressure to be 1.0-1.5 bar; then straightening, wherein the elongation of the online straightener is 3.1-3.3%;
10. naturally aging the coiled material treated in the step nine, controlling the aging temperature to be 10-35 ℃ and the aging time to be 96-120 h;
11. performing cold working treatment on the coiled material treated in the step ten;
12. cutting the coiled material processed in the step eleven to obtain a finished board;
13. and detecting the finished product plate obtained in the twelfth step, wherein a qualified finished product is the high-strength heat treatment strengthenable aluminum alloy plate quenched in the air cushion furnace, and the manufacturing is finished.
The solid solution temperature and the solid solution heating and heat preservation time set by the method are main factors for strengthening the sufficient solid solution of the aluminum alloy through high-strength heat treatment, and the sufficient supersaturated solid solution is a condition for ensuring the mechanical property of the alloy. The quenching cooling rate is to ensure that enough supersaturated solid solution is fixed in the aluminum alloy matrix, a large number of vacant sites are fixed in the crystal after quenching cooling, the vacant sites in the supersaturated solid solution are combined with solute atoms, the existence of the vacant sites accelerates the diffusion speed of the solute atoms to form a solute atom enrichment zone G.P (I) which is prepared for the precipitation of strengthening phases in the subsequent natural aging process, and G.P (I) is adopted along with the extension of the natural aging timeThe solute atoms in the area are orderly arranged to form a G.P (II) area, so that the crystal lattice near G.P area is distorted, the dislocation resistance is increased, the alloy is strengthened, and the strength is increased. With the further extension of the natural aging time, the G, P region is gradually transformed to the transition phase theta ', the theta' phase and the parent phase keep a coherent relationship, and the CuAl in the matrix 2 And CuMgAl 2 The main strengthening phases are more, the alloy strength and the elongation are higher, and the mechanical property of the alloy after natural aging is ensured. The cold working is to carry out cold working on the basis of natural aging, further improve the strength of the alloy under the action of cold work hardening, and ensure the final mechanical property of the alloy.
The invention has the beneficial effects that:
1. the invention adopts the more advanced air cushion furnace heat treatment production line in the aluminum alloy processing industry to carry out quenching, and has a new breakthrough in the aspects of product quality, safety and energy consumption compared with the traditional production modes of salt bath furnace quenching and sheet type cold work hardening; by controlling key parameters such as solid solution temperature, heating and heat preservation time, quenching and cooling rate, pre-deformation amount, natural aging time, cold work hardening amount and the like, the surface quality, the plate shape and the mechanical property of the product are ensured, and the quality stability is high. The high-strength heat treatment strengthening aluminum alloy plate quenched by the air cushion furnace has excellent product quality, the unevenness of the plate shape is 2-5mm, and the plate shape meets the standard and the use requirement of a user; the non-proportional elongation stress is defined to be 355-361N/mm 2 Tensile strength of 447-455N/mm 2 The elongation is 11.2-13.0%, and the mechanical property meets the standard requirement.
2. The high-strength heat treatment strengthened aluminum alloy plate quenched by the air cushion furnace also has the advantages that firstly, the uniformity of the solution heating temperature is high during quenching, the batch cold work amount is stable during cold work hardening, the product quality stability is high, the surface quality is excellent, the plate shape is flat, and the plate is beneficial to slitting and processing for users; and secondly, the aluminum alloy waste is easy to recycle, can be recycled, and has the characteristics of no combustion, safety in fire and the like.
The preparation method is used for preparing the high-strength heat-treatment strengthenable aluminum alloy plate.
Drawings
FIG. 1 is a photograph of the microstructure of a high-strength heat-treated strengtheneable aluminum alloy sheet quenched in an air cushion furnace in the thickness direction (metallographic microscope, ratio 1;
FIG. 2 is a photograph of the microstructure of a high-strength heat-treated strengthened aluminum alloy sheet quenched in an air cushion furnace in the thickness direction (metallographic microscope, ratio 1;
fig. 3 is a photograph of the microstructure of a high-strength heat-treated strengthened aluminum alloy sheet quenched in a gas cushion furnace in the thickness direction (metallographic microscope, scale 1.
Detailed Description
The first embodiment is as follows: the embodiment provides a method for manufacturing a high-strength heat-treatment strengtheneable aluminum alloy plate quenched in an air cushion furnace, which comprises the following steps:
1. according to the weight percentage: 4.55 to 4.85 percent of Cu, 0.50 to 0.80 percent of Mn, 1.50 to 1.80 percent of Mg, less than 0.27 percent of Si, less than 0.45 percent of Fe, less than 0.10 percent of Ni, less than 0.20 percent of Zn, less than 0.10 percent of Ti and the balance of Al, weighing a copper ingot, an aluminum-manganese intermediate alloy, a magnesium ingot and an aluminum ingot, and then weighing the copper ingot, the aluminum-manganese intermediate alloy, the magnesium ingot and the aluminum ingot;
adding the weighed aluminum ingot into a resistance reflection furnace, heating to 750-795 ℃, adding metal copper into the resistance reflection furnace, stirring for 6-10 min, and keeping the melt temperature at 750-795 ℃ during stirring; then adding magnesium ingot, stirring for 7-10 min, adding aluminum-manganese intermediate alloy, and stirring for 12-15 min;
with Ar-Cl 2 Refining the mixed gas for 6-10 min, and covering with a flux to obtain an alloy melt; introducing the alloy melt into a standing furnace of a resistance reverberatory furnace at the temperature of 735-765 ℃, and introducing Ar-Cl 2 Refining the mixed gas for 9-14 min, standing for 10-23 min, and then performing semi-continuous casting under the conditions that the casting speed is 32-40 mm/min, the casting temperature is 720-740 ℃, and the casting cooling water pressure is 0.03-0.08 MPa to obtain an ingot;
2. carrying out homogenization annealing treatment on the ingot obtained in the first step;
3. carrying out surface milling treatment on the cast ingot treated in the step two;
4. carrying out double-sided aluminum coating on the cast ingot treated in the step three;
5. heating the cast ingot treated in the step four, controlling the temperature of furnace gas to be 525-535 ℃, heating for 9.0-9.5 h, rotating to a fixed temperature of 465-475 ℃, and discharging;
6. carrying out hot rolling on the cast ingot treated in the fifth step to obtain a hot rolled coil;
7. cold rolling the hot rolled coil obtained in the sixth step to obtain a cold rolled coil;
8. cleaning and trimming the cold-rolled coil obtained in the step seven to obtain a coiled material;
9. quenching the coiled material obtained in the step eight by using an air cushion furnace, controlling the temperature of the furnace to be 497-503 ℃ and the speed of a process section to be 3.4-3.6 m/min, quenching by using water at 15-35 ℃ and controlling the pressure to be 1.0-1.5 bar; then straightening, wherein the elongation of the online straightener is 3.1-3.3%;
10. naturally aging the coiled material treated in the step nine, controlling the aging temperature to be 10-35 ℃ and the aging time to be 96-120 h;
11. performing cold working treatment on the coiled material treated in the step ten;
12. cutting the coiled material processed in the step eleven to obtain a finished board;
13. and (4) detecting the finished product plate obtained in the step twelve, wherein a qualified finished product is the high-strength heat-treatment strengthenable aluminum alloy plate quenched in the air cushion furnace, and the manufacturing is finished.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: the second step of controlling a homogenization annealing system comprises the following steps: the first stage, furnace gas temperature 530 ℃, temperature rising 300min, heat preservation 260min, the second stage, furnace gas temperature 490 ℃, temperature rising 80min, heat preservation 420min, the third stage, furnace gas constant temperature 490min, heat preservation 1140min, ingot casting temperature 485-495 ℃. The rest is the same as the first embodiment.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: and step three, surface milling treatment, wherein the surface milling thickness of each surface is controlled to be 18-20 mm, and the ingot casting specification after surface milling is 384mm multiplied by 1375mm multiplied by 6000mm. The rest is the same as the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment mode and one of the first to third embodiment modes is: and step four, double-side aluminum coating, namely coating LB2 aluminum plates on the upper surface and the lower surface of the cast ingot, wherein the specification of the LB2 aluminum plates is 25mm multiplied by 1260mm multiplied by 5900mm. The others are the same as in one of the first to third embodiments.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: the sixth hot rolling pass comprises the following steps: 434mm-422mm-410mm-398mm-386mm-374mm-362mm-335mm-307mm-280mm-252mm-223mm-190mm-165mm-140mm-112mm-88mm-72mm-59mm-38mm-24mm-14mm-8.5mm-6.0mm, and the specification of the obtained hot rolled coil is 6.0mm multiplied by 1350mm. The other is the same as one of the first to fourth embodiments.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is: the seventh cold rolling pass comprises the following steps: 6.0mm-4.2mm-2.9mm-2.55mm, and the obtained cold-rolled coil has the specification of 2.55mm multiplied by 1350mm. The other is the same as one of the first to fifth embodiments.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: and step eight, cleaning and trimming by adopting a stretch bending straightener, controlling the cleaning speed to be 120m/min, the cleaning water temperature to be 75-85 ℃, and trimming until the width is 1211mm, wherein the specification of the obtained coiled material is 2.55mm multiplied by 1211mm. The other is the same as one of the first to sixth embodiments.
The specific implementation mode is eight: the present embodiment differs from one of the first to seventh embodiments in that: step eleven, performing cold working treatment by using a cold rolling mill, controlling the cold working amount to be 3.0%, and performing rolling pass: 2.48mm to 2.41mm, the coil gauge obtained is 2.41mm x 1203mm. The other is the same as one of the first to seventh embodiments.
The specific implementation method nine: the present embodiment differs from the first to eighth embodiments in that: and step twelve, shearing by using a transverse shearing machine, wherein the shearing length is 3500mm, and reserving a test sample strip with the specification of 2.41mm multiplied by 300mm multiplied by 1203mm. The rest is the same as the first to eighth embodiments.
The detailed implementation mode is ten: the present embodiment differs from one of the first to ninth embodiments in that: and step thirteen, the mechanical property test and the microstructure detection are carried out on the sample strip. The other is the same as one of the first to ninth embodiments.
The invention is not limited to the above embodiments, and one or a combination of several embodiments may also achieve the object of the invention.
The first embodiment is as follows:
the embodiment of the invention provides a method for manufacturing a high-strength heat treatment strengthenable aluminum alloy plate quenched in an air cushion furnace, which is characterized by comprising the following steps: it comprises the following steps:
1. according to the weight percentage: 4.55 to 4.85 percent of Cu, 0.50 to 0.80 percent of Mn, 1.50 to 1.80 percent of Mg, less than 0.27 percent of Si, less than 0.45 percent of Fe, less than 0.10 percent of Ni, less than 0.20 percent of Zn, less than 0.10 percent of Ti and the balance of Al, wherein the sum of the mass percentages of Fe and Ni is less than 0.50 percent, weighing a copper ingot, an aluminum-manganese intermediate alloy, a magnesium ingot and an aluminum ingot, and then weighing the copper ingot, the aluminum-manganese intermediate alloy, the magnesium ingot and the aluminum ingot;
adding the weighed aluminum ingot into a resistance reflection furnace, heating to 780 ℃, adding metal copper into the resistance reflection furnace, stirring for 10min, and keeping the melt temperature at 750-795 ℃ during stirring; then adding a magnesium ingot, stirring for 8min, adding an aluminum-manganese intermediate alloy, and stirring for 15min;
with Ar-Cl 2 Refining the mixed gas for 8min, ar-Cl 2 The volume percentage content of Ar in the mixed gas is 94 percent, and Cl 2 6 percent of volume percentage content, and covering with No. 1 flux to obtain alloy melt; introducing the alloy melt into a standing furnace of a resistance reverberatory furnace at the temperature of 750 ℃, and introducing Ar-Cl 2 Refining the mixed gas for 13min, standing for 15min, keeping the alloy melt liquid level in the resistance reverberatory furnace and the alloy melt liquid level in the flow table at the same level, and then performing semi-continuous casting under the conditions that the casting speed is 38mm/min, the casting temperature is 740 ℃, and the casting cooling water pressure is 0.05MPa to obtain an ingot, wherein the specification of the ingot is that of the ingot420mm×1400mm×6000mm；
2. Carrying out homogenization annealing treatment on the ingot obtained in the step one by using a homogenizing furnace;
the control of the homogenization annealing system is as follows: the first stage, furnace gas temperature 530 ℃, temperature rising 300min, heat preservation 260min, the second stage, furnace gas temperature 490 ℃, temperature rising 80min, heat preservation 420min, the third stage, furnace gas constant temperature 490min, heat preservation 1140min, ingot casting temperature 485-495 ℃;
3. milling the cast ingot processed in the step two by using a milling machine; the thickness of the milled surface of each surface is controlled to be 18mm, and the specification of the cast ingot after the surface milling is 384mm multiplied by 1375mm multiplied by 6000mm;
4. performing double-sided aluminum coating on the cast ingot treated in the step three; double-sided aluminum coating is to coat LB2 aluminum plates on the upper surface and the lower surface of the cast ingot, wherein the specification of the LB2 aluminum plates is 25mm multiplied by 1260mm multiplied by 5900mm;
5. loading the cast ingot treated in the step four into a pushing furnace for heating treatment, controlling the temperature of furnace gas to be 530 ℃, heating for 9.0h, rotating to be at a constant temperature of 470 ℃, and discharging;
6. carrying out hot rolling on the cast ingot treated in the fifth step to obtain a hot rolled coil;
hot rolling is carried out by adopting a hot rolling mill, and the hot rolling passes are as follows: 434mm-422mm-410mm-398mm-386mm-374mm-362mm-335mm-307mm-280mm-252mm-223mm-190mm-165mm-140mm-112mm-88mm-72mm-59mm-38mm-24mm-14mm-8.5mm-6.0mm, the specification of the obtained hot rolled coil is 6.0mm multiplied by 1350mm;
7. cold rolling the hot rolled coil obtained in the sixth step to obtain a cold rolled coil;
cold rolling is carried out by adopting a cold rolling mill, and the cold rolling passes are as follows: 6.0mm-4.2mm-2.9mm-2.55mm, and the obtained cold-rolled coil has the specification of 2.55mm multiplied by 1350mm;
8. cleaning and trimming the cold-rolled coil obtained in the step seven to obtain a coiled material;
cleaning and trimming by using a stretch bending straightener, controlling the cleaning speed to be 120m/min, the cleaning water temperature to be 75-85 ℃, and trimming until the width is 1211mm, wherein the specification of the obtained coiled material is 2.55mm multiplied by 1211mm;
9. quenching the coiled material obtained in the step eight by using an air cushion furnace, controlling the temperature of the furnace to be 500 ℃, the speed of a process section to be 3.5m/min, quenching by using water at the temperature of 15-35 ℃, and controlling the pressure to be 1.0-1.5 bar; then straightening is carried out, and the elongation of the online straightener is 3.2%;
10. naturally aging the coiled material treated in the step nine, controlling the aging temperature to be 10-35 ℃ and the aging time to be 100h;
11. performing cold working treatment on the coiled material treated in the step ten; cold working treatment is carried out by adopting a cold rolling mill, the cold working amount is controlled to be 3.0%, and the rolling pass is as follows: 2.48mm-2.41mm, and the specification of the obtained coiled material is 2.41mm multiplied by 1203mm;
12. cutting the coiled material processed in the step eleven to obtain a finished board; shearing by using a cross shearing machine, wherein the shearing length is 3500mm, and reserving sample strips with the specification of 2.41mm multiplied by 300mm multiplied by 1203mm;
13. and (4) carrying out mechanical property test and microstructure detection on the finished product plate obtained in the twelfth step, wherein a qualified finished product is the high-strength heat-treatment strengthenable aluminum alloy plate quenched in the air cushion furnace, and the manufacturing is finished.
The sample strips are cut to the specification of 2.41mm multiplied by 25mm multiplied by 190mm, the samples are tested for mechanical property, and the samples of 2.41mm multiplied by 30mm are carried out for detecting and analyzing the microstructure.
Through detection, in the aspect of mechanical properties of the plate prepared by the invention, the specified non-proportional elongation stress, tensile strength and elongation mechanical property dispersion difference is small, and the high-quality performance of the plate meets the use requirement of a user; in the aspect of microstructure, the whole internal crystal grains are recrystallized grains, and have a light and slightly elongated appearance under the action of cold hardening, the second phase has less residue, the alloy is fully dissolved, and a precipitated phase is dispersed and precipitated and is uniformly distributed.
The mechanical properties of the high-strength heat-treatment strengthened aluminum alloy sheet quenched in the air cushion furnace were analyzed to obtain the following data parameters, which are detailed in table 1. The method is obtained from mechanical property data, meets the technical standard, has small mechanical property dispersion difference, and shows that the solid solution is complete under the quenching system, and enough supersaturated solid solution is obtained. After quenching and cooling, a large number of vacancies are fixed in the crystal, the vacancies in the supersaturated solid solution are combined with solute atoms, and the existence of the vacancies acceleratesThe diffusion speed of solute atoms forms a solute atom enrichment area G.P (I) area, preparation is made for precipitation of a strengthening phase in the subsequent natural aging process, and the cooling rate meets the alloy characteristics. Along with the extension of natural aging time, solute atoms in the G.P (I) area are orderly arranged to form the G.P (II) area, so that the crystal lattice near the G.P area is distorted, the dislocation resistance is increased, the alloy is strengthened, and the strength is increased. With the further extension of the natural aging time, the G, P region is gradually transformed to the transition phase theta ', the theta' phase and the parent phase keep a coherent relationship, and the CuAl in the matrix 2 And CuMgAl 2 The main strengthening phases are more, and the basic strength of the alloy is ensured. The cold working amount is proper after natural aging, thereby ensuring the mechanical property of the alloy.
TABLE 1
FIG. 1 is a photograph of the microstructure of a high-strength heat-treated strengthened aluminum alloy sheet quenched in a gas cushion furnace in the thickness direction (metallographic microscope, scale 1; as can be seen from the figure, the high-strength heat treatment manufactured by the method can strengthen the polarized light photo of the aluminum alloy plate, the whole internal crystal grains are all recrystallized crystal grains, the high-strength heat treatment has a light and slightly elongated shape under the action of cold hardening, and the internal structure is uniform.
FIG. 2 is a photograph of the thickness-wise microstructure of a high-strength heat-treated strengthened aluminum alloy sheet quenched in an air cushion furnace according to example one (metallographic microscope, scale 1; as can be seen from the figure, the high-strength heat treatment manufactured by the method can strengthen the high-power photograph of the aluminum alloy plate, the second phase is less remained, the alloy is fully dissolved, and the solid solution degree of the alloy is ensured.
FIG. 3 is a photograph of the microstructure of a high-strength heat-treated strengthened aluminum alloy sheet quenched in a gas cushion furnace in the thickness direction (metallographic microscope, scale 1; as can be seen from the figure, the high-power photograph of the high-strength heat treatment strengthened aluminum alloy plate manufactured by the method has the advantages that the CuAl2 and the CuMgAl2 are dispersed and precipitated, the number of the main strengthened phases is large, the alloy strength and the elongation are high, and the mechanical property of the alloy after natural aging is ensured.
The present invention has been described in terms of the preferred embodiments, but it is not limited thereto, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention will still fall within the technical scope of the present invention.
Claims (10)
1. A manufacturing method of a high-strength heat treatment strengtheneable aluminum alloy plate quenched by an air cushion furnace is characterized in that: the method comprises the following steps:
1. according to the weight percentage: 4.55 to 4.85 percent of Cu, 0.50 to 0.80 percent of Mn, 1.50 to 1.80 percent of Mg, less than 0.27 percent of Si, less than 0.45 percent of Fe, less than 0.10 percent of Ni, less than 0.20 percent of Zn, less than 0.10 percent of Ti and the balance of Al, weighing a copper ingot, an aluminum-manganese intermediate alloy, a magnesium ingot and an aluminum ingot, and then weighing the copper ingot, the aluminum-manganese intermediate alloy, the magnesium ingot and the aluminum ingot;
adding the weighed aluminum ingot into a resistance reflection furnace, heating to 750-795 ℃, adding metal copper into the resistance reflection furnace, stirring for 6-10 min, and keeping the melt temperature at 750-795 ℃ during stirring; then adding magnesium ingot, stirring for 7-10 min, adding aluminum-manganese intermediate alloy, and stirring for 12-15 min;
with Ar-Cl 2 Refining the mixed gas for 6-10 min, and covering with a flux to obtain an alloy melt; introducing the alloy melt into a standing furnace of a resistance reverberatory furnace at the temperature of 735-765 ℃, and introducing Ar-Cl 2 Refining the mixed gas for 9-14 min, standing for 10-23 min, and then performing semi-continuous casting under the conditions that the casting speed is 32-40 mm/min, the casting temperature is 720-740 ℃, and the casting cooling water pressure is 0.03-0.08 MPa to obtain an ingot;
2. carrying out homogenization annealing treatment on the ingot obtained in the step one;
3. carrying out surface milling treatment on the cast ingot treated in the step two;
4. performing double-sided aluminum coating on the cast ingot treated in the step three;
5. heating the cast ingot treated in the step four, controlling the temperature of furnace gas to be 525-535 ℃, heating for 9.0-9.5 h, rotating to a fixed temperature of 465-475 ℃, and discharging;
6. carrying out hot rolling on the cast ingot treated in the fifth step to obtain a hot rolled coil;
7. cold rolling the hot rolled coil obtained in the sixth step to obtain a cold rolled coil;
8. cleaning and trimming the cold-rolled coil obtained in the seventh step to obtain a coiled material;
9. quenching the coiled material obtained in the step eight by using an air cushion furnace, controlling the temperature of the furnace to be 497-503 ℃ and the speed of a process section to be 3.4-3.6 m/min, quenching by using water at 15-35 ℃ and controlling the pressure to be 1.0-1.5 bar; then straightening, wherein the elongation of the online straightener is 3.1-3.3%;
10. naturally aging the coiled material treated in the step nine, controlling the aging temperature to be 10-35 ℃ and the aging time to be 96-120 h;
11. performing cold working treatment on the coiled material treated in the step ten;
12. cutting the coiled material processed in the eleventh step to obtain a finished plate;
13. and (4) detecting the finished product plate obtained in the step twelve, wherein a qualified finished product is the high-strength heat-treatment strengthenable aluminum alloy plate quenched in the air cushion furnace, and the manufacturing is finished.
2. The method of claim, wherein the step of forming the high strength heat treated strengthenable aluminum alloy sheet is carried out in a gas cushion furnace quenching process, the method comprising the steps of: the second step of controlling a homogenization annealing system comprises the following steps: the first stage, furnace gas temperature 530 ℃, temperature rising 300min, heat preservation 260min, the second stage, furnace gas temperature 490 ℃, temperature rising 80min, heat preservation 420min, the third stage, furnace gas constant temperature 490min, heat preservation 1140min, ingot casting temperature 485-495 ℃.
3. The method for manufacturing a high-strength heat-treated strengthenable aluminum alloy sheet for air cushion furnace quenching as claimed in claim, wherein said method comprises the steps of: and step three, surface milling treatment, wherein the surface milling thickness of each surface is controlled to be 18-20 mm, and the ingot casting specification after surface milling is 384mm multiplied by 1375mm multiplied by 6000mm.
4. The method of claim, wherein the step of forming the high strength heat treated strengthenable aluminum alloy sheet is carried out in a gas cushion furnace quenching process, the method comprising the steps of: and step four, double-side aluminum coating, namely coating LB2 aluminum plates on the upper surface and the lower surface of the cast ingot, wherein the specification of the LB2 aluminum plates is 25mm multiplied by 1260mm multiplied by 5900mm.
5. The method of claim, wherein the step of forming the high strength heat treated strengthenable aluminum alloy sheet is carried out in a gas cushion furnace quenching process, the method comprising the steps of: the hot rolling passes in the step six are as follows: 434mm-422mm-410mm-398mm-386mm-374mm-362mm-335mm-307mm-280mm-252mm-223mm-190mm-165mm-140mm-112mm-88mm-72mm-59mm-38mm-24mm-14mm-8.5mm-6.0mm, and the specification of the obtained hot rolled coil is 6.0mm multiplied by 1350mm.
6. The method for manufacturing a high-strength heat-treated strengthenable aluminum alloy sheet for air cushion furnace quenching as claimed in claim, wherein said method comprises the steps of: the seventh cold rolling pass comprises the following steps: 6.0mm-4.2mm-2.9mm-2.55mm, and the obtained cold-rolled coil has the specification of 2.55mm multiplied by 1350mm.
7. The method of claim, wherein the step of forming the high strength heat treated strengthenable aluminum alloy sheet is carried out in a gas cushion furnace quenching process, the method comprising the steps of: and step eight, cleaning and trimming by adopting a stretch bending straightener, controlling the cleaning speed to be 120m/min, the cleaning water temperature to be 75-85 ℃, and trimming until the width is 1211mm, wherein the specification of the obtained coiled material is 2.55mm multiplied by 1211mm.
8. The method of claim, wherein the step of forming the high strength heat treated strengthenable aluminum alloy sheet is carried out in a gas cushion furnace quenching process, the method comprising the steps of: step eleven, performing cold working treatment by using a cold rolling mill, controlling the cold working amount to be 3.0%, and performing rolling pass: 2.48mm to 2.41mm, the coil gauge obtained is 2.41mm x 1203mm.
9. The method of claim, wherein the step of forming the high strength heat treated strengthenable aluminum alloy sheet is carried out in a gas cushion furnace quenching process, the method comprising the steps of: and step twelve, shearing by using a transverse shearing machine, wherein the shearing length is 3500mm, and reserving a test sample strip with the specification of 2.41mm multiplied by 300mm multiplied by 1203mm.
10. The method of claim, wherein the step of forming the high strength heat treated strengthenable aluminum alloy sheet is carried out in a gas cushion furnace quenching process, the method comprising the steps of: and step thirteen, the mechanical property test and the microstructure detection are carried out on the sample strip.
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| CN116732456A (en) * | 2023-06-13 | 2023-09-12 | 西南铝业（集团）有限责任公司 | Production process of high-strength hard aluminum alloy plate |
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