CN115927982B - Heat treatment method for improving corrosion performance of 7-series aluminum alloy - Google Patents
Heat treatment method for improving corrosion performance of 7-series aluminum alloy Download PDFInfo
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- CN115927982B CN115927982B CN202211423429.2A CN202211423429A CN115927982B CN 115927982 B CN115927982 B CN 115927982B CN 202211423429 A CN202211423429 A CN 202211423429A CN 115927982 B CN115927982 B CN 115927982B
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 108
- 230000007797 corrosion Effects 0.000 title claims abstract description 34
- 238000005260 corrosion Methods 0.000 title claims abstract description 34
- 238000010438 heat treatment Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000006104 solid solution Substances 0.000 claims abstract description 106
- 238000005485 electric heating Methods 0.000 claims abstract description 29
- 238000001816 cooling Methods 0.000 claims abstract description 26
- 238000009413 insulation Methods 0.000 claims abstract description 25
- 230000032683 aging Effects 0.000 claims abstract description 24
- 238000007789 sealing Methods 0.000 claims abstract description 15
- 239000000956 alloy Substances 0.000 claims abstract description 11
- 238000004901 spalling Methods 0.000 claims abstract description 6
- 230000001276 controlling effect Effects 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000010791 quenching Methods 0.000 claims description 7
- 230000000171 quenching effect Effects 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000005728 strengthening Methods 0.000 abstract description 3
- 230000035882 stress Effects 0.000 abstract description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000003028 elevating effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910000853 7075 T6 aluminium alloy Inorganic materials 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- -1 aluminum-magnesium-zinc-copper Chemical compound 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The invention discloses a heat treatment method for improving the corrosion performance of 7-series aluminum alloy, which comprises a heat treatment device, wherein the heat treatment device comprises a base, a solid solution furnace, an aluminum alloy body, a solid solution cavity, an electric heating layer, a heat insulation door, a sealing plate, a support frame, a traversing mechanism, a primary lifting mechanism, a secondary lifting mechanism and a cooling mechanism, and the heat treatment method for improving the corrosion performance of 7-series aluminum alloy comprises the following steps: s1: and starting the transverse moving mechanism to enable the support frame on the sealing plate to be completely moved out of the solid solution cavity, and stably placing the aluminum alloy body on the support frame. The advantages are that: the contradiction between strengthening and stress corrosion resistance can be solved through the process treatment of primary solid solution, secondary solid solution, tertiary solid solution, primary aging, secondary aging and tertiary aging, so that the 7-series aluminum alloy has high strength and high spalling corrosion resistance, and the alloy material has wider application field.
Description
Technical Field
The invention relates to the technical field of heat treatment processes of aluminum alloy materials, in particular to a heat treatment method for improving corrosion performance of 7-series aluminum alloy.
Background
The 7 series aluminum alloy belongs to aviation series, is aluminum-magnesium-zinc-copper alloy, is heat-treatable alloy, belongs to super-hard aluminum alloy, has good wear resistance and good weldability, but has poor corrosion resistance. Generally, the 7-series aluminum alloy has the highest performance in the T6 state and reaches the peak state, but has poor anti-stripping corrosion performance. The T7 state is an overaging state, and the anti-stripping corrosion performance is good, but the mechanical property is more attenuated than the T6 state, so that a heat treatment method for improving the corrosion performance of the 7-series aluminum alloy is required to be designed.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a heat treatment method for improving the corrosion performance of 7-series aluminum alloy.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The heat treatment method for improving the corrosion performance of the 7-series aluminum alloy comprises a heat treatment device, wherein the heat treatment device consists of a base, a solid solution furnace, an aluminum alloy body, a solid solution cavity, an electric heating layer, a heat insulation door, a sealing plate, a support frame, a transverse moving mechanism, a primary lifting mechanism, a secondary lifting mechanism and a cooling mechanism;
The aluminum alloy body is arranged on the support frame;
The transverse moving mechanism consists of an installing table, a servo motor, a screw rod, a sliding chute, a sliding rod and two L-shaped rods, wherein the installing table is fixedly arranged at the upper end of the solid solution furnace, the servo motor is fixedly arranged on the side wall of the installing table, the screw rod is fixedly connected to the output end of the servo motor, the sliding chute is arranged on the installing table, the sliding chute is arranged in a front-back through way, the sliding rod is slidably connected in the sliding chute, the sliding rod is in threaded connection with the screw rod, the two L-shaped rods are respectively fixedly arranged at the front end and the rear end of the sliding rod, and the heat insulation door is arranged between the two L-shaped rods;
The primary lifting mechanism consists of a lifting motor, a lead screw, two lifting blocks and two lifting grooves, wherein the two lifting blocks are respectively and fixedly arranged at the front end and the rear end of the heat insulation door, the two lifting grooves are respectively formed in two L-shaped rods and are matched with the two lifting blocks, the lifting motor is fixedly arranged on the side wall of one L-shaped rod, the lead screw is fixedly connected to the output end of the lifting motor, and one end of the lead screw, which is positioned in the lifting groove, is in threaded connection with the corresponding lifting block;
The secondary lifting mechanism consists of a fixed plate, a moving block, a moving groove, a screw rod, a mounting groove, a moving motor and a chain transmission mechanism, wherein the fixed plate is fixedly arranged on a supporting frame, the moving block is fixedly arranged on the side wall of the fixed plate, the moving groove is formed in a sealing plate and is matched with the moving block, the screw rod is rotationally connected in the moving groove, the screw rod is in threaded connection with the moving block, the mounting groove is formed in a heat insulation door, the moving motor is fixedly arranged in the mounting groove, and the chain transmission mechanism is arranged between the screw rod and the output end of the moving motor;
The cooling mechanism consists of a mounting frame, a drain pipe, a plurality of mounting holes and a plurality of powerful fans, wherein the mounting frame is fixedly arranged on the right side wall of the base station, the drain pipe is arranged at the lower end of the right side of the mounting frame, the plurality of mounting holes are respectively formed in the front side wall and the rear side wall of the mounting frame, and the plurality of powerful fans are respectively arranged in the corresponding mounting holes;
The heat treatment method for improving the corrosion performance of the 7-series aluminum alloy comprises the following steps of:
s1: starting the transverse moving mechanism to enable the support frame on the sealing plate to be completely moved out of the solid solution cavity, and stably placing the aluminum alloy body on the support frame;
S2: starting the transverse moving mechanism to enable the support frame to drive the aluminum alloy body thereon to completely enter the solid solution cavity, and enabling the heat insulation door to seal the front end of the solid solution cavity;
S3: the temperature in the solid solution cavity is controlled by adjusting the electric heating layer, and primary solid solution treatment is carried out on the aluminum alloy body for 1 hour at the temperature of 460 ℃;
S4: after the primary solid solution treatment is finished, controlling the electric heating layer to heat the interior of the solid solution cavity to 470 ℃, performing secondary solid solution treatment for 1.5 hours on the aluminum alloy body, and after the secondary solid solution treatment is finished, controlling the electric heating layer to heat the interior of the solid solution cavity to 480 ℃, performing tertiary solid solution treatment for the aluminum alloy body for hours;
s5: after finishing three-stage solid solution treatment, maintaining the temperature in the solid solution cavity at 120 ℃, performing primary aging treatment on the aluminum alloy body for a period of time-hours, then starting a transverse moving mechanism to enable the support frame to drive the aluminum alloy body to completely move out of the solid solution cavity, and air-cooling the aluminum alloy body to room temperature for standing for 24-48 hours;
S6: after the primary aging treatment is finished, starting a traversing mechanism to send the aluminum alloy body into a solid solution cavity, controlling an electric heating layer to maintain the temperature in the solid solution cavity at 190 ℃, placing the aluminum alloy body in the solid solution cavity for the secondary aging treatment of a period of-minutes, starting the traversing mechanism to completely remove the aluminum alloy body out of a solid solution furnace, and then starting a primary lifting mechanism and a secondary lifting mechanism in sequence, so that a support frame drives the aluminum alloy body to enter a cooling mechanism for water quenching and cooling;
S7: after finishing the secondary aging treatment of the aluminum alloy body, sequentially starting a primary lifting mechanism and a secondary lifting mechanism, enabling the heat insulation door to be aligned with the height of the solid solution furnace, starting a transverse moving mechanism to send the aluminum alloy body into the solid solution cavity, controlling an electric heating layer to enable the temperature in the solid solution cavity to be maintained at 138 ℃, placing the aluminum alloy body in the solid solution cavity for 16-20 hours of tertiary aging treatment, then starting the transverse moving mechanism to completely remove the aluminum alloy body out of the solid solution furnace, starting the primary lifting mechanism to enable the aluminum alloy body to enter the cooling mechanism to be cooled by strong wind, and finally obtaining the 7-series aluminum alloy material with high strength and high spalling corrosion resistance.
In the above heat treatment method for improving corrosion performance of 7-series aluminum alloy, a control panel is fixedly mounted on the front side wall of the solution furnace, and the control panel is electrically connected with the electric heating layer, the servo motor, the lifting motor, the moving motor and the powerful fan.
In the heat treatment method for improving the corrosion performance of the 7-series aluminum alloy, the minimum distance between the mounting hole and the bottom wall of the mounting frame is larger than the sum of the heights of the support frame and the aluminum alloy body.
Compared with the prior art, the invention has the advantages that:
1: the contradiction between strengthening and stress corrosion resistance can be solved through the process treatment of primary solid solution, secondary solid solution, tertiary solid solution, primary aging, secondary aging and tertiary aging, so that the 7-series aluminum alloy has high strength and high spalling corrosion resistance, and the alloy material has wider application field.
2: Through the design of sideslip mechanism, can make the insulated door about relative solution furnace as required, be convenient for take or place of aluminum alloy body in the solution furnace.
3: Through the design of cooling mechanism, can select respectively to carry out water quenching cooling or strong wind cooling to the aluminum alloy material, need not to transport the aluminum alloy material at different equipment, can effectively improve work efficiency.
4: Through the cooperation of one-level elevating system and second grade elevating system, can control the reciprocates position of aluminum alloy body as required, be convenient for make it remove to the assigned position on the installing frame and carry out water quenching cooling or strong wind cooling.
In summary, the invention solves the contradiction between strengthening and stress corrosion resistance through the process treatment of primary solid solution, secondary solid solution, tertiary solid solution, primary aging, secondary aging and tertiary aging, thereby leading the 7-series aluminum alloy to have high strength and high spalling corrosion resistance and leading the alloy material to have wider application field.
Drawings
FIG. 1 is a schematic structural diagram of a heat treatment device for improving corrosion performance of a 7-series aluminum alloy according to the present invention;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a right side view of FIG. 2;
Fig. 4 is an enlarged schematic view of the structure of the portion a in fig. 1.
In the figure: 1 base station, 2 solid solution furnace, 3 aluminum alloy body, 4 solid solution cavity, 5 electrothermal layer, 6 heat insulation door, 7 closing plate, 8 support frame, 9 mount table, 10 spout, 11 slide bar, 12L shape pole, 13 servo motor, 14 mount frame, 15 mounting hole, 16 powerful fan, 17 drain pipe, 18 elevator motor, 19 elevator block, 20 fixed plate, 21 movable block, 22 movable groove, 23 lead screw, 24 mounting groove, 25 movable motor, 26 chain drive mechanism, 27 control panel.
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 to 4, a heat treatment method for improving the corrosion performance of a 7-series aluminum alloy comprises a heat treatment device, wherein the heat treatment device comprises a base 1, a solid solution furnace 2, an aluminum alloy body 3, a solid solution cavity 4, an electric heating layer 5, a heat insulation door 6, a sealing plate 7, a supporting frame 8, a traversing mechanism, a primary lifting mechanism, a secondary lifting mechanism and a cooling mechanism, and the heat treatment method for improving the corrosion performance of the 7-series aluminum alloy comprises the following steps:
s1: starting a traversing mechanism to enable a supporting frame 8 on a sealing plate 7 to be completely moved out of the solid solution cavity 4, and stably placing an aluminum alloy body 3 on the supporting frame 8;
s2: starting the transverse moving mechanism to enable the support frame 8 to drive the aluminum alloy body 3 thereon to completely enter the solid solution cavity 4, and enable the heat insulation door 6 to seal the front end of the solid solution cavity 4;
s3: the electric heating layer 5 is regulated to control the temperature in the solid solution cavity 4, and the aluminum alloy body 3 is subjected to primary solid solution treatment for 1 hour at the temperature of 460 ℃;
S4: after the primary solid solution treatment is finished, the electric heating layer 5 is controlled to heat the interior of the solid solution cavity 4 to 470 ℃, the secondary solid solution treatment is carried out on the aluminum alloy body 3 for 1.5 hours, and after the secondary solid solution treatment is finished, the electric heating layer 5 is controlled to heat the interior of the solid solution cavity 4 to 480 ℃, and the tertiary solid solution treatment is carried out on the aluminum alloy body 3 for 2 hours;
s5: after the three-stage solid solution treatment is completed, the temperature in the solid solution cavity 4 is maintained at 120 ℃, the aluminum alloy body 3 is subjected to primary aging treatment for 1-5 hours, and then a transverse moving mechanism is started to enable the support frame 8 to drive the aluminum alloy body 3 to completely move out of the solid solution cavity 4, and the aluminum alloy body is air-cooled to room temperature and is parked for 24-48 hours;
S6: after the primary aging treatment is finished, starting a traversing mechanism to send the aluminum alloy body 3 into the solid solution cavity 4, controlling the electric heating layer 5 to maintain the temperature in the solid solution cavity 4 at 190 ℃, placing the aluminum alloy body 3 into the solid solution cavity for the secondary aging treatment for 20-60 minutes, starting the traversing mechanism to completely remove the aluminum alloy body 3 out of the solid solution furnace 2, and then starting a primary lifting mechanism and a secondary lifting mechanism in sequence, so that the support frame 8 drives the aluminum alloy body 3 to enter a cooling mechanism for water quenching and cooling;
S7: after finishing the secondary aging treatment of the aluminum alloy body 3, sequentially starting a primary lifting mechanism and a secondary lifting mechanism, enabling the heat insulation door 6 to be aligned with the solid solution furnace 2 in height, starting a transverse moving mechanism to send the aluminum alloy body 3 into the solid solution cavity 4, controlling the electric heating layer 5 to maintain the temperature in the solid solution cavity 4 at 138 ℃, placing the aluminum alloy body 3 in the solid solution cavity for 16-20 hours for three-stage aging treatment, then starting the transverse moving mechanism to completely remove the aluminum alloy body 3 out of the solid solution furnace 2, starting the primary lifting mechanism to enable the aluminum alloy body 3 to enter a cooling mechanism for strong wind cooling, and finally obtaining the 7-series aluminum alloy material with high strength and high spalling corrosion resistance.
The above noted are:
1. the solid solution furnace 2 is fixedly installed on the base 1, the solid solution cavity 4 is formed in the solid solution furnace 2, the electric heating layer 5 is fixedly installed in the solid solution furnace 2, the heat insulation door 6 is installed on the solid solution furnace 2 through the transverse moving mechanism, the sealing plate 7 is fixedly installed at one end, close to the solid solution furnace 2, of the heat insulation door 6, the supporting frame 8 is fixedly installed on the sealing plate 7, the aluminum alloy body 3 is placed on the supporting frame 8, and the electric heating layer 5 is used for controlling the temperature in the solid solution cavity 4.
2. The sideslip mechanism comprises mount table 9, servo motor 13, the screw rod, spout 10, slide bar 11 and two L shape poles 12, mount table 9 fixed mounting is in solution furnace 2 upper end, servo motor 13 fixed mounting is on the lateral wall of mount table 9, screw rod fixed connection is on servo motor 13's output, spout 10 is seted up on mount table 9, and spout 10 link up the setting around for, slide bar 11 sliding connection is in spout 10, and slide bar 11 and screw rod threaded connection, two L shape poles 12 are fixed mounting respectively at slide bar 11's front and back both ends, insulated door 6 installs between two L shape poles 12, through servo motor 13's operation, can be under the cooperation of screw rod and slide bar 11, make two L shape poles 12 drive insulated door 6 and carry out the horizontal movement relative to solution furnace 2, consequently, can control the position of aluminum alloy body 3 relative to solution furnace 2, be convenient for take or place in solution furnace 2 of aluminum alloy body 3.
3. The primary lifting mechanism consists of a lifting motor 18, a screw rod, two lifting blocks 19 and two lifting grooves, wherein the two lifting blocks 19 are respectively fixedly installed at the front end and the rear end of the heat insulation door 6, the two lifting grooves are respectively formed in the two L-shaped rods 12, the two lifting grooves are respectively matched with the two lifting blocks 19, the lifting motor 18 is fixedly installed on the side wall of one L-shaped rod 12, the screw rod is fixedly connected to the output end of the lifting motor 18, one end of the screw rod, which is located in the lifting groove, is in threaded connection with the corresponding lifting block 19, and the heat insulation door 6 can move up and down relative to the solid solution furnace 2 through the matching of the lifting motor 18 and the screw rod.
4. The secondary lifting mechanism consists of a fixed plate 20, a moving block 21, a moving groove 22, a screw rod 23, a mounting groove 24, a moving motor 25 and a chain transmission mechanism 26, wherein the fixed plate 20 is fixedly arranged on a supporting frame 8, the moving block 21 is fixedly arranged on the side wall of the fixed plate 20, the moving groove 22 is arranged on a sealing plate 7, the moving groove 22 is matched with the moving block 21, the screw rod 23 is rotationally connected in the moving groove 22, the screw rod 23 is in threaded connection with the moving block 21, the mounting groove 24 is arranged in a heat insulation door 6, the moving motor 25 is fixedly arranged in the mounting groove 24, the chain transmission mechanism 26 is arranged between the screw rod 23 and the output end of the moving motor 25, and the screw rod 23 can be simultaneously rotated when the moving motor 25 works through the design of the chain transmission mechanism 26, so that the upper and lower positions of the supporting frame 8 relative to the heat insulation door 6 can be controlled, and the up and down moving distance of the aluminum alloy body 3 relative to the solid solution furnace 2 can be further expanded.
5. The cooling mechanism comprises a mounting frame 14, a drain pipe 17, a plurality of mounting holes 15 and a plurality of powerful fans 16, wherein the mounting frame 14 is fixedly arranged on the right side wall of the base 1, the drain pipe 17 is arranged at the lower end of the right side of the mounting frame 14, the plurality of mounting holes 15 are respectively formed in the front side wall and the rear side wall of the mounting frame 14, the plurality of powerful fans 16 are respectively arranged in the corresponding mounting holes 15, cooling water is filled in the mounting frame 14 and used for carrying out water quenching treatment on the aluminum alloy body 3, the filling water level of the cooling water is lower than the lower end of the mounting hole 15 by 5cm, the plurality of powerful fans 16 can carry out strong wind cooling treatment on the aluminum alloy body 3 positioned in the mounting frame 14 during operation, specifically, the stroke of the primary lifting mechanism enables the aluminum alloy body 3 to move to the middle of the plurality of powerful fans 16 in the mounting frame 14, the lower surface of the primary lifting mechanism is positioned above the liquid level, the stroke of the secondary lifting mechanism enables the aluminum alloy body 3 to move to the lower end of the mounting frame 14, and the upper surface of the aluminum alloy body 3 is positioned below the liquid level, and the body 3 is convenient for carrying out water quenching treatment on the aluminum alloy body 3.
6. The minimum distance between the mounting hole 15 and the bottom wall of the mounting frame 14 is larger than the sum of the heights of the support frame 8 and the aluminum alloy body 3, a control panel 27 is fixedly mounted on the side wall of the front end of the solution furnace 2, the control panel 27 is electrically connected with the electric heating layer 5, the servo motor 13, the lifting motor 18, the moving motor 25 and the powerful fan 16, the servo motor 13, the lifting motor 18 and the moving motor 25 can be 130ST-M05025LFB type servo motors, the control panel 27 can be a KV-16AT type controller, the electric heating layer 5 and the powerful fan 16 are all existing products, the working principle and the specific structure of the electric heating layer 5 and the powerful fan 16 are not specifically described herein, and the working conditions of the electric heating layer 5, the servo motor 13, the lifting motor 18, the moving motor 25 and the powerful fan 16 can be conveniently and specifically controlled by workers through the design of the control panel 27.
7. The tensile strength, the yield strength and the elongation of the 7-series aluminum alloy obtained by the method are respectively as follows: 523. 585, 9.7%, peel corrosion grade EA; the general 7075-T6 aluminum alloy has three aspects of tensile strength, yield strength and elongation: 515. 572, 7.7%, peel corrosion rating EC; the general 7075-T7 aluminum alloy has three aspects of tensile strength, yield strength and elongation: 476. 531, 10.5%, the peeling corrosion grade is EB, and it is clear from the above data that the 7-series aluminum alloy treated by the method has high strength and high peeling corrosion resistance.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (3)
1. The heat treatment method for improving the corrosion performance of the 7-series aluminum alloy is characterized by comprising a heat treatment device, wherein the heat treatment device consists of a base (1), a solid solution furnace (2), an aluminum alloy body (3), a solid solution cavity (4), an electric heating layer (5), a heat insulation door (6), a sealing plate (7), a supporting frame (8), a transverse moving mechanism, a primary lifting mechanism, a secondary lifting mechanism and a cooling mechanism;
The aluminum alloy solid solution furnace is characterized in that the solid solution furnace (2) is fixedly arranged on the base station (1), the solid solution cavity (4) is formed in the solid solution furnace (2), the electric heating layer (5) is fixedly arranged in the solid solution furnace (2), the heat insulation door (6) is arranged on the solid solution furnace (2) through a transverse moving mechanism, the sealing plate (7) is fixedly arranged at one end, close to the solid solution furnace (2), of the heat insulation door (6), the supporting frame (8) is fixedly arranged on the sealing plate (7), and the aluminum alloy body (3) is arranged on the supporting frame (8);
The transverse moving mechanism consists of a mounting table (9), a servo motor (13), a screw rod, a sliding groove (10), a sliding rod (11) and two L-shaped rods (12), wherein the mounting table (9) is fixedly arranged at the upper end of a solid solution furnace (2), the servo motor (13) is fixedly arranged on the side wall of the mounting table (9), the screw rod is fixedly connected to the output end of the servo motor (13), the sliding groove (10) is arranged on the mounting table (9), the sliding groove (10) is arranged in a front-back penetrating way, the sliding rod (11) is slidably connected in the sliding groove (10), the sliding rod (11) is in threaded connection with the screw rod, the two L-shaped rods (12) are respectively fixedly arranged at the front end and the rear end of the sliding rod (11), and the heat insulation door (6) is arranged between the two L-shaped rods (12);
The primary lifting mechanism consists of a lifting motor (18), a lead screw, two lifting blocks (19) and two lifting grooves, wherein the two lifting blocks (19) are respectively and fixedly arranged at the front end and the rear end of the heat insulation door (6), the two lifting grooves are respectively formed in the two L-shaped rods (12), the two lifting grooves are respectively matched with the two lifting blocks (19), the lifting motor (18) is fixedly arranged on the side wall of one L-shaped rod (12), the lead screw is fixedly connected to the output end of the lifting motor (18), and one end of the lead screw, which is positioned in the lifting groove, is in threaded connection with the corresponding lifting block (19);
The secondary lifting mechanism consists of a fixed plate (20), a moving block (21), a moving groove (22), a screw rod (23), a mounting groove (24), a moving motor (25) and a chain transmission mechanism (26), wherein the fixed plate (20) is fixedly arranged on a supporting frame (8), the moving block (21) is fixedly arranged on the side wall of the fixed plate (20), the moving groove (22) is formed in a sealing plate (7), the moving groove (22) is matched with the moving block (21), the screw rod (23) is rotationally connected in the moving groove (22), the screw rod (23) is in threaded connection with the moving block (21), the mounting groove (24) is formed in a heat insulation door (6), the moving motor (25) is fixedly arranged in the mounting groove (24), and the chain transmission mechanism (26) is arranged between the screw rod (23) and the output end of the moving motor (25).
The cooling mechanism consists of a mounting frame (14), a drain pipe (17), a plurality of mounting holes (15) and a plurality of powerful fans (16), wherein the mounting frame (14) is fixedly arranged on the right side wall of the base station (1), the drain pipe (17) is arranged at the lower end of the right side of the mounting frame (14), the plurality of mounting holes (15) are respectively formed in the front side wall and the rear side wall of the mounting frame (14), and the plurality of powerful fans (16) are respectively arranged in the corresponding mounting holes (15);
The heat treatment method for improving the corrosion performance of the 7-series aluminum alloy comprises the following steps of:
S1: starting a transverse moving mechanism to enable a supporting frame (8) on a sealing plate (7) to be completely moved out of the solid solution cavity (4), and stably placing an aluminum alloy body (3) on the supporting frame (8);
s2: starting the transverse moving mechanism to enable the support frame (8) to drive the aluminum alloy body (3) on the transverse moving mechanism to completely enter the solid solution cavity (4), and enabling the heat insulation door (6) to seal the front end of the solid solution cavity (4);
S3: the electric heating layer (5) is regulated to control the temperature in the solid solution cavity (4), and the aluminum alloy body (3) is subjected to primary solid solution treatment for 1 hour at the temperature of 460 ℃;
S4: after the primary solid solution treatment is finished, the electric heating layer (5) is controlled to heat the interior of the solid solution cavity (4) to 470 ℃, the aluminum alloy body (3) is subjected to secondary solid solution treatment for 1.5 hours, and after the secondary solid solution treatment is finished, the electric heating layer (5) is controlled to heat the interior of the solid solution cavity (4) to 480 ℃, and the aluminum alloy body (3) is subjected to tertiary solid solution treatment for 2 hours;
S5: after finishing three-stage solid solution treatment, maintaining the temperature in the solid solution cavity (4) at 120 ℃, performing primary aging treatment on the aluminum alloy body (3) for 1-5 hours, then starting a transverse moving mechanism to enable the support frame (8) to drive the aluminum alloy body (3) to completely move out of the solid solution cavity (4), and air-cooling the aluminum alloy body to room temperature for standing for 24-48 hours;
S6: after the primary aging treatment is finished, starting a traversing mechanism to send the aluminum alloy body (3) into a solid solution cavity (4), controlling an electric heating layer (5) to maintain the temperature in the solid solution cavity (4) at 190 ℃, placing the aluminum alloy body (3) in the solid solution cavity for secondary aging treatment for 20-60 minutes, starting the traversing mechanism to completely remove the aluminum alloy body (3) out of the solid solution furnace (2), and then sequentially starting a primary lifting mechanism and a secondary lifting mechanism to enable a support frame (8) to drive the aluminum alloy body (3) to enter a cooling mechanism for water quenching and cooling;
S7: after finishing the secondary aging treatment of the aluminum alloy body (3), sequentially starting a primary lifting mechanism and a secondary lifting mechanism, enabling the heat insulation door (6) to be aligned with the solid solution furnace (2), starting a transverse moving mechanism to send the aluminum alloy body (3) into the solid solution cavity (4), controlling the electric heating layer (5) to keep the temperature in the solid solution cavity (4) at 138 ℃, placing the aluminum alloy body (3) in the electric heating layer for 16-20 hours of tertiary aging treatment, then starting the transverse moving mechanism to completely remove the aluminum alloy body (3) out of the solid solution furnace (2), starting the primary lifting mechanism to enable the aluminum alloy body (3) to enter the cooling mechanism for strong wind cooling, and finally obtaining the 7-series aluminum alloy material with high strength and high anti-spalling corrosion capability.
2. The heat treatment method for improving the corrosion performance of the 7-series aluminum alloy according to claim 1, wherein a control panel (27) is fixedly arranged on the side wall of the front end of the solution furnace (2), and the control panel (27) is electrically connected with the electric heating layer (5), the servo motor (13), the lifting motor (18), the moving motor (25) and the powerful fan (16).
3. The heat treatment method for improving the corrosion performance of 7-series aluminum alloy according to claim 1, wherein the minimum distance between the mounting hole (15) and the bottom wall of the mounting frame (14) is larger than the sum of the heights of the supporting frame (8) and the aluminum alloy body (3).
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| CN113981342A (en) * | 2021-09-03 | 2022-01-28 | 福建祥鑫股份有限公司 | Heat treatment method for improving stress corrosion resistance of 7-series aluminum alloy |
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