CN113981342B - Heat treatment method for improving stress corrosion resistance of 7-series aluminum alloy - Google Patents
Heat treatment method for improving stress corrosion resistance of 7-series aluminum alloy Download PDFInfo
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- CN113981342B CN113981342B CN202111032147.5A CN202111032147A CN113981342B CN 113981342 B CN113981342 B CN 113981342B CN 202111032147 A CN202111032147 A CN 202111032147A CN 113981342 B CN113981342 B CN 113981342B
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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
- C22F1/002—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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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
- C21D1/10—Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
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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
- C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
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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
- C22F1/053—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 of alloys with zinc as the next major constituent
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention relates to the technical field of aluminum alloy heat treatment, and particularly discloses a heat treatment method for improving the stress corrosion resistance of a 7-series aluminum alloy, which comprises six steps of natural aging, primary artificial aging, primary solution treatment, secondary artificial aging and tertiary artificial aging; the device comprises an aging treatment chamber, a strong wind cooling device, a solution treatment chamber and a quenching device which are arranged from left to right in sequence; the heat treatment method disclosed by the invention enables the head and tail properties of the material to be more stable and the corrosion resistance to be better, meanwhile, the whole heat treatment device can automatically realize artificial aging, solid solution treatment, forced air cooling and quenching treatment according to the whole heat treatment process, and the whole process does not need operators to carry out auxiliary operation, so that the automation degree is high, and the using effect is excellent.
Description
Technical Field
The invention relates to the technical field of aluminum alloy heat treatment, and particularly discloses a heat treatment method for improving the stress corrosion resistance of 7-series aluminum alloy.
Background
The 7000 series aluminum alloy is an aluminum alloy with zinc as a main alloying element, belongs to heat treatment strengthenable aluminum alloys, and comprises an AI-Zn-Mg alloy and an AI-Zn-Mg-Cu alloy. The AI-Zn-Mg alloy can obtain higher strength under proper heat treatment conditions, has good welding performance, is a strong weldable aluminum alloy and is widely applied to high-speed trains and underwater weapons. The Al-Zn-Mg-Cu alloy has higher strength than the Al-Zn-Mg alloy, is called ultra-high strength aluminum alloy, is widely applied to the fields of aviation and aerospace, becomes one of the most important structural materials in the field, and typically represents 7055, 7050 and 7075 alloys. 7000 series aluminum alloy has better corrosion resistance, but is inferior to 6000 series aluminum alloy, and has a certain stress corrosion tendency, and Stress Corrosion Cracking (SCC) is a main cause of failure of the product in the service process.
Due to the increasing problems of energy shortage and environmental pollution, light weight has become a necessary trend for the development of transportation equipment in the future. The 7000 series aluminum alloy is a main material for future light weight of transportation equipment due to the advantages of low density, high specific strength, easy processing and forming and the like, but the improvement of the stress corrosion resistance of the 7 series aluminum alloy is particularly important due to the poor stress corrosion resistance. Therefore, aiming at the defect of poor corrosion resistance of the existing 7000 series aluminum alloy, the invention provides a heat treatment method with high stress corrosion resistance of the 7 series aluminum alloy.
In addition, the traditional aluminum alloy material heat treatment is that the aluminum alloy material with treatment is manually put into a heating chamber for heating aging treatment or solution treatment, and the aluminum alloy material is manually taken out after heating is finished, so that the labor intensity is high, the heat treatment efficiency is low, and the manual operation process has great danger. Therefore, in view of the above-mentioned shortcomings of the conventional heat treatment apparatus for aluminum alloys, the present invention also provides a heat treatment apparatus for use in the above heat treatment method.
Disclosure of Invention
The invention aims to design a heat treatment method for improving the stress corrosion resistance of 7 series aluminum alloy and a matched heat treatment device aiming at the defects that the corrosion resistance of the existing 7000 series aluminum alloy is poor and the existing heat treatment device needs manual feeding and material taking.
The invention is realized by the following technical scheme:
a heat treatment method for improving the stress corrosion resistance of 7-series aluminum alloy comprises the following steps:
1) natural aging: cooling the extruded material to room temperature, and naturally aging for 48-72 h at room temperature;
2) first-stage artificial aging: preserving the temperature of the extruded material treated in the step 1 at 110-130 ℃ for 18-24 h, and cooling by adopting strong wind after discharging;
3) primary solution treatment: performing primary solution treatment on the extruded material treated in the step 2 at the temperature of 430-450 ℃ for 0.5-2 hours, and cooling the extruded material along with a furnace for 1 hour;
4) secondary solution treatment: carrying out secondary solid solution strengthening treatment on the extruded material treated in the step 3 at the temperature of 470-500 ℃ for 0.5-2 hours, immediately quenching and cooling to room temperature after the secondary solid solution strengthening treatment is finished;
5) secondary artificial aging: heating the extruded material treated in the step (5) to 90-130 ℃ along with a furnace for low-temperature aging treatment, wherein the aging time is 1-8 h;
6) three-stage artificial aging: and (4) heating the extruded material treated in the step (5) to 140-180 ℃ for high-temperature aging treatment, wherein the aging treatment time is 12-24 h.
Preferably, the cooling rate of the strong wind cooling in the second step is controlled to be 10-30 ℃/min.
Preferably, the quenching medium in the fourth step is water with the temperature of 40-70 ℃.
Preferably, the temperature of the room temperature in the first step is 10 ℃ to 45 ℃.
A heat treatment device for improving the stress corrosion resistance of the aluminum alloy is a device assembly in the second step, the third step, the fourth step, the fifth step and the sixth step, and comprises an aging treatment chamber, a strong wind cooling device, a solid solution treatment chamber and a quenching device which are sequentially arranged from left to right;
wherein, the aging treatment chamber and the solid solution treatment chamber both comprise a heating machine case and a first conveyor which runs through the heating machine case, gate openings are arranged on the left side surface and the right side surface of the heating machine case, a sealing flashboard is inserted at the upper end of the gate openings, the top end of the sealing flashboard is connected with a stop strip, the upper surface of the heating machine case which is arranged beside each sealing flashboard is fixedly connected with two rotating frames which are symmetrical front and back, a horizontal rotating rod is rotatably connected between the two rotating frames, two groups of wire wheels are arranged on the horizontal rotating rod, a winding motor is fixedly arranged in the middle of the upper surface of the heating machine case, a wire winding rod is connected on the output shaft of the winding motor, a wire winding wheel corresponding to each group of the wire wheels is arranged on the wire winding rod, a traction rope is connected on the wire winding wheel, and the traction rope is connected with the stop strip after passing through the corresponding wire wheels, the front inner wall and the rear inner wall of the heating machine box in the aging treatment chamber and the solid solution treatment chamber are respectively provided with a low-power electromagnetic heating coil and a high-power electromagnetic heating coil;
the strong wind cooling device comprises a second conveyor, a blower and a smoke absorption hood, the blower is arranged below the second conveyor, the blower is connected with an air supply pipe which is arranged right opposite to the second conveyor, the smoke absorption hood is arranged above the second conveyor and right opposite to the air supply pipe, and the upper end of the smoke absorption hood is connected with a smoke exhaust pipeline;
wherein, the second conveyer comprises a U-shaped frame, a plurality of conveying rollers are arranged at equal intervals in the U-shaped frame, the two ends of each conveying roller are connected with a roller shaft connected with the U-shaped frame, one end of each roller shaft extending out of the U-shaped frame is connected with a gear, a horizontal moving strip is arranged above one row of the gears, the two ends of the U-shaped frame are provided with guide frames matched with the two ends of the horizontal moving strip, the lower surface of the horizontal moving strip is provided with a lower tooth surface meshed with each gear, the upper surface of the horizontal moving strip is provided with an upper tooth surface, the U-shaped frame is welded with a connecting seat, the upper end of the connecting seat is provided with a swing motor, the output shaft of the swing motor is connected with a turntable arranged right above the horizontal moving strip, the non-center part of the turntable is connected with a convex shaft, and the connecting seat below the turntable is connected with a pin rod, the pin rod is rotatably connected with a swing arm, a strip-shaped opening matched with the convex shaft is formed in the swing arm, and the lower end of the swing arm is connected with a sector gear meshed with the upper tooth surface of the horizontal moving strip;
the quenching device comprises a third conveyor and a water tank, the water tank is arranged at the lower end of the third conveyor close to one side of the solid solution treatment chamber, a portal frame is fixedly arranged on the third conveyor right above the water tank, an expansion device is arranged on the upper surface of the portal frame, the lower end of a piston rod of the expansion device is connected with a U-shaped plate, and a row of guide rollers horizontally arranged is rotatably connected in the U-shaped plate.
As a further arrangement of the above scheme, the side surfaces of the first conveyor and the third conveyor are respectively provided with a driving device, the driving device comprises a transmission case horizontally arranged along the front side surface of the U-shaped frame, one end of the transmission case is provided with a driving motor, a gear rotating rod connected with the driving motor is arranged in the transmission case, the gear rotating rod is connected with a plurality of first bevel gears at equal intervals, and the end parts of the transmission rollers of the first conveyor and the third conveyor, which extend into the transmission case, are connected with second bevel gears engaged with the corresponding first bevel gears.
As a further arrangement of the scheme, the heating case is made of a high-temperature-resistant inner container and an external heat-insulating layer.
As a further arrangement of the above scheme, two sets of wire guide wheels are arranged on the horizontal rotating rod and are respectively arranged at the front end and the rear end of the horizontal rotating rod.
As a further arrangement of the scheme, the water tank is also provided with a temperature probe and a liquid level sensor.
As a further arrangement of the scheme, the telescopic device is one of a hydraulic cylinder, an air cylinder or an electric push rod.
Has the advantages that:
1) compared with single-stage solid solution and single-stage aging, the invention keeps equivalent to single-stage peak aging strength, but improves the stress corrosion resistance; compared with single-stage solid solution and double-stage aging, the strength of the double-stage aging is improved, and the stress corrosion resistance is improved; the whole process of the heat treatment adopts the process of multi-stage solid solution and multi-stage aging, so that the head and tail of the material are more stable in performance and better in corrosion resistance.
2) The heat treatment device disclosed by the invention can automatically realize artificial aging, solid solution treatment, forced air cooling and quenching treatment according to the whole heat treatment process, does not need operators to perform auxiliary operation in the whole process, and has high automation degree and excellent use effect.
3) The strong wind cooling part of the device drives the turntable to rotate through the motor, then the swing arm is acted by the strip-shaped opening and the convex shaft to enable the sector gear to do reciprocating swing action, then the horizontal moving strip reciprocates through the meshing action between the sector gear and the tooth surface, and then the lower tooth surface of the horizontal moving strip is in meshing transmission with the gear, so that the transmission roller in the rack is in positive and negative switching rotation, finally the section on the transmission roller continuously reciprocates in the strong wind cooling process, the cooling of the whole section is more uniform, and the performance uniformity of the aluminum alloy after heat treatment is further enhanced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flowchart showing the steps of heat treatment in the present invention;
FIG. 2 is a schematic perspective view of the present invention;
FIG. 3 is a schematic view of a first angled perspective view of an aging or solution treatment chamber according to the present invention;
FIG. 4 is a schematic view of a second angled perspective of an aging or solution treatment chamber according to the present invention;
FIG. 5 is a schematic perspective view of the forced air cooling apparatus according to the present invention;
FIG. 6 is a schematic view of a first angled perspective of a second conveyor of the present invention;
FIG. 7 is a second perspective view of a second conveyor of the present invention;
FIG. 8 is an enlarged view of the structure of FIG. 6 at A according to the present invention;
FIG. 9 is a schematic perspective view of a third conveyor and a water tank according to the present invention;
FIG. 10 is a schematic perspective view of a gantry, a telescopic device, a U-shaped plate and a guide roller according to the present invention;
fig. 11 is a schematic top view of the driving device of the present invention.
Wherein:
100-aging treatment chamber, 300-solution treatment chamber, 101-heating cabinet, 102-first conveyer, 103-gate opening, 104-sealing gate plate, 105-barrier strip, 106-rotating frame, 107-horizontal rotating rod, 108-wire guide wheel, 109-winding motor, 110-wire winding rod, 111-wire winding wheel, 112-traction rope, 113-low-power electromagnetic heating coil and 114-high-power electromagnetic heating coil;
200-strong wind cooling device, 201-second conveyor, 2010-guide frame, 2011-U type frame, 2012-transmission roller, 2013-roller shaft, 2014-gear, 2015-horizontal moving strip, 2016-connecting seat, 2017-swing motor, 2018-turntable, 2019-convex shaft, 2020-pin rod, 2021-swing arm, 2022-strip port and 2023-sector gear;
400-a quenching device, 401-a third conveyor, 402-a water tank, 403-a portal frame, 404-a telescopic device, 405-a U-shaped plate and 406-a guide roller;
500-drive means, 501-gear box, 502-drive motor, 503-gear rotating rod, 504-first bevel gear, 505-second bevel gear.
Detailed Description
In order to make the technical solutions of the present application better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the accompanying drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The method and apparatus for manufacturing the calcium-containing wrought aluminum alloy disclosed in this application will be described in detail with reference to the accompanying drawings 1 to 11.
Example 1
Example 1 discloses a heat treatment method for improving the stress corrosion resistance of a 7-series aluminum alloy, which comprises the following six heat treatment steps with reference to the attached drawing 1:
1) natural aging: and after cooling the extruded material to room temperature, naturally aging for 48-72 h at the room temperature, wherein the room temperature is 10-45 ℃.
2) First-stage artificial aging: and (3) preserving the temperature of the extruded material treated in the step (1) at 110-130 ℃ for 18-24 h, and cooling by adopting strong wind after discharging, wherein the cooling rate of the strong wind cooling in the step (II) is controlled at 10-30 ℃/min.
3) Primary solution treatment: and (3) performing primary solution treatment on the extruded material treated in the step (2) at the temperature of 430-450 ℃ for 0.5-2 hours, and cooling the extruded material along with the furnace for 1 hour.
4) Secondary solution treatment: and (3) performing secondary solution strengthening treatment on the extruded material treated in the step (3) at the temperature of 470-500 ℃ for 0.5-2 hours, immediately quenching and cooling to room temperature after the secondary solution strengthening treatment is finished, wherein the quenching medium in the step (four) is water at the temperature of 40-70 ℃.
5) Secondary artificial aging: and (4) heating the extruded material treated in the step (5) to 90-130 ℃ along with a furnace to perform low-temperature aging treatment, wherein the aging time is 1-8 h.
6) Three-stage artificial aging: and (4) heating the extruded material treated in the step (5) to 140-180 ℃ for high-temperature aging treatment, wherein the aging treatment time is 12-24 h.
Example 2
In this embodiment 2, a heat treatment apparatus for improving the stress corrosion resistance of a 7-series aluminum alloy is disclosed, and referring to fig. 2, the heat treatment apparatus includes an aging treatment chamber 100, a strong wind cooling apparatus 200, a solution treatment chamber 300, and a quenching apparatus 400, which are arranged from left to right in this order, and the aging treatment chamber 100, the strong wind cooling apparatus 200, the solution treatment chamber 300, and the quenching apparatus 400 are connected end to end.
Referring to fig. 3 and 4, the ageing treatment chamber 100 and the solution treatment chamber 300 are substantially identical in construction and both include a heating cabinet 101 and a first conveyor 102 disposed through the heating cabinet. And the heating cabinet 101 is made of a high temperature resistant inner container and an external heat insulation layer.
The left side and the right side of the heating cabinet 101 are provided with gate openings 103, the upper end of the gate opening 103 is inserted with a sealing gate plate 104, and the top end of the sealing gate plate 104 is connected with a barrier strip 105. The upper surface of the heating case 101 beside each sealing gate plate 104 is fixedly connected with two symmetrical rotating frames 106, a horizontal rotating rod 107 is rotatably connected between the two rotating frames 106, two groups of wire wheels 108 are arranged on the horizontal rotating rod 107, and the two groups of wire wheels 108 arranged on the horizontal rotating rod 107 are two when the wire guide device is specifically arranged and are respectively arranged at the front end and the rear end of the horizontal rotating rod 107. A winding motor 109 is fixedly arranged in the middle of the upper surface of the heating cabinet 101, an output shaft of the winding motor 109 is connected with a wire winding rod 110, and the wire winding rod 110 is provided with a wire winding wheel 111 corresponding to each group of wire guide wheels 108. Each reel 111 is connected to a traction rope 112, and the traction rope 112 is connected to the stopper bar 105 after passing around the corresponding wire guide wheel 108.
The structural design of the aging treatment chamber 100 and the solution treatment chamber 300 can directly realize the winding or unwinding of the traction rope 112 by controlling the forward and reverse rotation of the winding motor 109 during feeding and heating treatment, and then realize the up-and-down movement of the sealing flashboard 104 in the gate opening 103 under the traction action of the traction rope 112, so as to realize the sealing or opening of the interior of the heating cabinet 101.
The aging chamber 100 and the solution treatment chamber 300 are arranged differently in this embodiment in that the low-power electromagnetic heating coils 113 are provided on the front and rear inner walls of the heating cabinet 101 in the aging chamber 100, and the high-power electromagnetic heating coils 114 are provided on the front and rear inner walls of the heating cabinet 101 in the solution treatment chamber 300.
Referring to fig. 5, 6, 7 and 8, the forced air cooling apparatus 200 of the present apparatus includes a second conveyor 201, a blower 202 and a hood 203. The blower 202 is disposed below the second conveyor 201, and a blower pipe 204 disposed opposite the second conveyor 201 is connected to the blower 202. A smoke suction hood 203 is disposed above the second conveyor 201 and is disposed opposite to the blast pipe 204, and a smoke discharge duct 205 is connected to an upper end of the smoke suction hood 203.
The second conveyor 201 comprises a U-shaped frame 2011, a plurality of conveying rollers 2012 are arranged in the U-shaped frame 2011 at equal intervals, and two ends of each conveying roller 2012 are connected with a roller shaft 2013 connected with the U-shaped frame 2011. One end of the roller shaft 2013 extending out of the U-shaped frame 2011 is connected with a gear 2014, a horizontal moving strip 2015 is arranged above the row of gears 2014, and guide frames 2010 matched with the two ends of the horizontal moving strip 2015 are arranged at the two ends of the U-shaped frame 2011.
A lower tooth surface that engages with each gear 2014 is provided on the lower surface of the horizontal movement bar 2015, and an upper tooth surface is provided on the upper surface of the horizontal movement bar 2015. A connecting seat 2016 is welded on the U-shaped frame 2011, a swing motor 2017 is arranged at the upper end of the connecting seat 2016, a rotary table 2018 arranged right above the horizontal moving strip 2015 is connected to an output shaft of the swing motor 2017, and a convex shaft 2019 is connected to the non-circle center of the rotary table 2018. A pin 2020 is connected to the connecting seat 2016 below the turntable 2018, a swing arm 2021 is rotatably connected to the pin 2020, a strip-shaped opening 2022 matched with the protruding shaft 2019 is formed in the swing arm 2021, and a sector gear 2023 meshed with the upper tooth surface of the horizontal moving strip 2015 is connected to the lower end of the swing arm 2021.
The structural design of the second conveyor 201 can realize the all-round quick air cooling of the profile by driving the swing motor 2017 to drive the turntable 2018 to rotate when the profile subjected to the time-effect treatment is conveyed to the position right below the air supply pipe 204 for strong air cooling, then enabling the sector gear 2023 to do reciprocating swing action due to the fact that the swing arm 2021 is subjected to the action of the strip-shaped opening 2022 and the convex shaft 2019, and enabling the profile to do reciprocating motion during air cooling on the transmission roller 2012 through the meshing action between the sector gear and the gear.
Referring to fig. 9 and 10, the quenching apparatus 400 includes a third conveyor 401 and a water tank 402, the water tank 402 is provided at a lower end of the third conveyor 401 near the side of the solution treatment chamber 300, and a temperature probe and a liquid level sensor are further provided in the water tank 402. A portal frame 403 is fixedly arranged on the third conveyor 401 right above the water tank 402, a telescopic device 404 is arranged on the upper surface of the portal frame 403, and the telescopic device 404 is one of a hydraulic cylinder, an air cylinder or an electric push rod during specific arrangement. The lower end of a piston rod of the telescopic device 404 is connected with a U-shaped plate 405, and a row of horizontally arranged guide rollers 406 are rotatably connected in the U-shaped plate 405.
The structure of the quenching apparatus 400 is configured to, when quenching treatment is required for the solution-treated profile, convey the profile to the guide roller 406 in the U-shaped plate 405, and then directly immerse the solution-treated profile into the quenching medium in the water tank 402 by the telescopic apparatus 404.
Finally, referring to fig. 11, the transmission of the first conveyor 102 and the third conveyor 401 in the present embodiment 1 is realized by the driving device 500 provided at the side. The driving device 500 includes a transmission box 501 horizontally disposed along a front side of a U-shaped frame 2011, a driving motor 502 is disposed at one end of the transmission box 501, a gear rotating rod 503 connected to the driving motor 502 is disposed in the transmission box 501, and the gear rotating rod 503 is connected to a plurality of first bevel gears 504 at equal intervals. Wherein the ends of the roller shafts of the conveying rollers on the first conveyor 102 and the third conveyor 401, which extend into the transmission case 501, are connected with second bevel gears 505 which are meshed with the corresponding first bevel gears 504. The gear rotating rod 503 is driven to rotate by the driving motor 502, and then automatic feeding and discharging of the first conveyor 102 and the third conveyor 401 can be realized through the meshing transmission of each pair of the first bevel gear 504 and the second bevel gear 505.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A heat treatment method for improving the stress corrosion resistance of 7-series aluminum alloy comprises the following steps:
1) natural aging: cooling the extruded material to room temperature, and naturally aging for 48-72 h at room temperature;
2) first-stage artificial aging: preserving the temperature of the extruded material treated in the step 1) at 110-130 ℃ for 18-24 h, and cooling by adopting strong wind after discharging;
3) primary solution treatment: carrying out primary solution treatment on the extruded material treated in the step 2) at the temperature of 430-450 ℃ for 0.5-2 hours, and cooling the extruded material along with a furnace for 1 hour;
4) secondary solution treatment: carrying out secondary solid solution strengthening treatment on the extruded material treated in the step 3) at the temperature of 470-500 ℃ for 0.5-2 hours, immediately quenching and cooling to room temperature after finishing the treatment;
5) secondary artificial aging: heating the extruded material treated in the step 4) to 90-130 ℃ along with a furnace for low-temperature aging treatment, wherein the aging time is 1-8 h;
6) three-stage artificial aging: heating the extruded material treated in the step 5) to 140-180 ℃ for high-temperature aging treatment, wherein the aging treatment time is 12-24 hours;
the method is characterized in that the device assembly comprises an aging treatment chamber (100), a strong wind cooling device (200), a solution treatment chamber (300) and a quenching device (400) which are sequentially arranged from left to right in the steps 2), 3), 4), 5) and 6);
wherein the aging treatment chamber (100) and the solution treatment chamber (300) both comprise a heating cabinet (101) and a first conveyor (102) penetrating through the heating cabinet, gate openings (103) are formed in the left side surface and the right side surface of the heating cabinet (101), a sealing gate plate (104) is inserted into the upper end of each gate opening (103), a barrier strip (105) is connected to the top end of each sealing gate plate (104), two rotating frames (106) which are symmetrical in the front and back are fixedly connected to the upper surface of the heating cabinet (101) beside each sealing gate plate (104), a horizontal rotating rod (107) is rotatably connected between the two rotating frames (106), two groups of wire guide wheels (108) are arranged on the horizontal rotating rod (107), a winding motor (109) is fixedly arranged in the middle of the upper surface of the heating cabinet (101), and a wire winding rod (110) is connected to an output shaft of the winding motor (109), the wire winding rod (110) is provided with wire winding wheels (111) corresponding to each group of wire guide wheels (108), the wire winding wheels (111) are connected with traction ropes (112), the traction ropes (112) are connected with the stop bars (105) after bypassing the corresponding wire guide wheels (108), and the front inner wall and the rear inner wall of the heating cabinet (101) in the aging treatment chamber (100) and the solution treatment chamber (300) are respectively provided with a low-power electromagnetic heating coil (113) and a high-power electromagnetic heating coil (114);
the strong wind cooling device (200) comprises a second conveyor (201), a blower (202) and a smoke suction hood (203), wherein the blower (202) is arranged below the second conveyor (201), an air supply pipe (204) which is arranged right opposite to the second conveyor (201) is connected onto the blower (202), the smoke suction hood (203) is arranged above the second conveyor (201) and right opposite to the air supply pipe (204), and the upper end of the smoke suction hood (203) is connected with a smoke exhaust pipeline (205);
wherein, second conveyer (201) includes U type frame (2011), interval arrangement has a plurality of transmission rollers (2012) in U type frame (2011), the both ends of transmission roller (2012) are connected with roller (2013) that are connected with U type frame (2011), the one end that U type frame (2011) is stretched out in roller (2013) is connected with gear (2014), be located one row the top of gear (2014) is provided with horizontal migration strip (2015), the both ends of U type frame (2011) are provided with guide frame (2010) with horizontal migration strip (2015) both ends assorted, the lower surface of horizontal migration strip (2015) is provided with the lower flank of tooth that meshes with every gear (2014), the upper surface of horizontal migration strip (2015) is provided with the upper flank of tooth, the welding has connecting seat (2016) in U type frame (2011), the upper end of connecting seat (2016) is provided with swing motor (2017), the output shaft of the swing motor (2017) is connected with a rotary table (2018) arranged right above a horizontal moving bar (2015), the non-circle center of the rotary table (2018) is connected with a convex shaft (2019), a pin rod (2020) is connected onto a connecting seat (2016) positioned below the rotary table (2018), a swing arm (2021) is rotatably connected onto the pin rod (2020), a strip-shaped opening (2022) matched with the convex shaft (2019) is formed in the swing arm (2021), and the lower end of the swing arm (2021) is connected with a sector gear (2023) meshed with the upper tooth surface of the horizontal moving bar (2015);
quenching unit (400) include third conveyer (401) and water tank (402), water tank (402) set up the lower extreme near solution treatment room (300) one side third conveyer (401), are located fixedly on third conveyer (401) directly over water tank (402) be provided with portal frame (403), the upper surface of portal frame (403) is provided with telescoping device (404), the piston rod lower extreme of telescoping device (404) is connected with U template (405), it has one row of deflector roll (406) that the level set up to rotate in U template (405).
2. The heat treatment method for improving the stress corrosion resistance of the 7-series aluminum alloy according to claim 1, wherein the cooling rate of the strong wind cooling in the step 2) is controlled to be 10-30 ℃/min.
3. The heat treatment method for improving the stress corrosion resistance of the 7-series aluminum alloy according to claim 1, wherein the quenching medium in the step 4) is water at 40-70 ℃.
4. The heat treatment method for improving the stress corrosion resistance of the 7-series aluminum alloy according to claim 1, wherein the room temperature in the step 1) is 10-45 ℃.
5. The device for the heat treatment method for improving the stress corrosion resistance of the 7-series aluminum alloy is characterized in that the device is a device assembly in the steps 2), 3), 4), 5) and 6), and comprises an aging treatment chamber (100), a strong wind cooling device (200), a solution treatment chamber (300) and a quenching device (400) which are arranged from left to right in sequence;
wherein the aging treatment chamber (100) and the solution treatment chamber (300) both comprise a heating cabinet (101) and a first conveyor (102) penetrating through the heating cabinet, gate openings (103) are formed in the left side surface and the right side surface of the heating cabinet (101), a sealing gate plate (104) is inserted into the upper end of each gate opening (103), a barrier strip (105) is connected to the top end of each sealing gate plate (104), two rotating frames (106) which are symmetrical in the front and back are fixedly connected to the upper surface of the heating cabinet (101) beside each sealing gate plate (104), a horizontal rotating rod (107) is rotatably connected between the two rotating frames (106), two groups of wire guide wheels (108) are arranged on the horizontal rotating rod (107), a winding motor (109) is fixedly arranged in the middle of the upper surface of the heating cabinet (101), and a wire winding rod (110) is connected to an output shaft of the winding motor (109), the wire winding rod (110) is provided with wire winding wheels (111) corresponding to each group of wire guide wheels (108), the wire winding wheels (111) are connected with traction ropes (112), the traction ropes (112) are connected with the stop bars (105) after bypassing the corresponding wire guide wheels (108), and the front inner wall and the rear inner wall of the heating cabinet (101) in the aging treatment chamber (100) and the solution treatment chamber (300) are respectively provided with a low-power electromagnetic heating coil (113) and a high-power electromagnetic heating coil (114);
the strong wind cooling device (200) comprises a second conveyor (201), a blower (202) and a smoke suction hood (203), wherein the blower (202) is arranged below the second conveyor (201), an air supply pipe (204) which is arranged right opposite to the second conveyor (201) is connected onto the blower (202), the smoke suction hood (203) is arranged above the second conveyor (201) and right opposite to the air supply pipe (204), and the upper end of the smoke suction hood (203) is connected with a smoke exhaust pipeline (205);
wherein, second conveyer (201) includes U type frame (2011), interval arrangement has a plurality of transmission rollers (2012) in U type frame (2011), the both ends of transmission roller (2012) are connected with roller (2013) that are connected with U type frame (2011), the one end that U type frame (2011) is stretched out in roller (2013) is connected with gear (2014), be located one row the top of gear (2014) is provided with horizontal migration strip (2015), the both ends of U type frame (2011) are provided with guide frame (2010) with horizontal migration strip (2015) both ends assorted, the lower surface of horizontal migration strip (2015) is provided with the lower flank of tooth that meshes with every gear (2014), the upper surface of horizontal migration strip (2015) is provided with the upper flank of tooth, the welding has connecting seat (2016) in U type frame (2011), the upper end of connecting seat (2016) is provided with swing motor (2017), the output shaft of the swing motor (2017) is connected with a rotary table (2018) arranged right above a horizontal moving bar (2015), the non-circle center of the rotary table (2018) is connected with a convex shaft (2019), a pin rod (2020) is connected onto a connecting seat (2016) positioned below the rotary table (2018), a swing arm (2021) is rotatably connected onto the pin rod (2020), a strip-shaped opening (2022) matched with the convex shaft (2019) is formed in the swing arm (2021), and the lower end of the swing arm (2021) is connected with a sector gear (2023) meshed with the upper tooth surface of the horizontal moving bar (2015);
the quenching device (400) comprises a third conveyor (401) and a water tank (402), wherein the water tank (402) is arranged at the lower end of the third conveyor (401) close to one side of the solution treatment chamber (300), a portal frame (403) is fixedly arranged on the third conveyor (401) right above the water tank (402), an expansion device (404) is arranged on the upper surface of the portal frame (403), the lower end of a piston rod of the expansion device (404) is connected with a U-shaped plate (405), and a row of guide rollers (406) which are horizontally arranged are rotatably connected in the U-shaped plate (405).
6. The apparatus of claim 5 for improving the stress corrosion resistance of the 7-series aluminum alloy, characterized in that the lateral surfaces of the first conveyor (102) and the third conveyor (401) are provided with a driving device (500), the driving device (500) comprises a transmission case (501) horizontally arranged along the front side surface of the U-shaped frame (2011), one end of the transmission case (501) is provided with a driving motor (502), a gear rotating rod (503) connected with the driving motor (502) is arranged in the transmission case (501), a plurality of first bevel gears (504) are connected to the gear rotating rod (503) at equal intervals, the ends of the roller shafts of the conveying rollers on the first conveyor (102) and the third conveyor (401) extending into the transmission box (501) are connected with second bevel gears (505) meshed with the corresponding first bevel gears (504).
7. The device for improving the stress corrosion resistance of the 7-series aluminum alloy according to the claim 5, wherein the heating cabinet (101) is made of a high-temperature-resistant inner container and an external heat-insulating layer.
8. The apparatus for improving the stress corrosion resistance of 7-series aluminum alloy according to claim 5, wherein two sets of guide rollers (108) are disposed on the horizontal rotating rod (107) and are respectively disposed at the front end and the rear end of the horizontal rotating rod (107).
9. The apparatus for improving the stress corrosion resistance of the 7-series aluminum alloy according to the claim 5, wherein a temperature probe and a liquid level sensor are further arranged in the water tank (402).
10. The apparatus for improving the stress corrosion resistance of the 7-series aluminum alloy according to claim 5, wherein the telescopic device (404) is one of a hydraulic cylinder, an air cylinder or an electric push rod.
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| JP2015175045A (en) * | 2014-03-17 | 2015-10-05 | 株式会社神戸製鋼所 | Aluminum alloy sheet for constructional material |
| CN105648369A (en) * | 2014-12-03 | 2016-06-08 | 天津飞踏自行车有限公司 | Thermal treatment method for 7005 aluminum alloy |
| CN104962847B (en) * | 2015-07-16 | 2016-11-16 | 中南大学 | A kind of raising 7 is the Technology for Heating Processing of alloy plate uniformity and corrosion resistance |
| CN106435418A (en) * | 2016-11-23 | 2017-02-22 | 重庆大学 | Heat treatment technology for improving intercrystalline corrosion resisting performance and stress corrosion resisting performance of 7-series aluminum alloy |
| CN208685020U (en) * | 2018-09-06 | 2019-04-02 | 太仓琪威金属制品有限公司 | A kind of automatic heat-treatment production line of fastener |
| CN111020316B (en) * | 2019-12-20 | 2020-08-28 | 福建祥鑫股份有限公司 | High-performance 7XXX aluminum alloy capable of being quenched on line and preparation method thereof |
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