Aluminum alloy coiled material quenching process with good continuity

Abstract

The invention discloses an aluminum alloy coiled material quenching process with good continuity, and relates to the technical field of aluminum processing, and the aluminum alloy coiled material quenching process comprises the steps of uncoiling, rough straightening, movable sewing, heating, spray quenching, fine straightening I, conveying, fine straightening II, cutting and coiling. According to the quenching process provided by the invention, the continuity of the process can be effectively improved, so that the generation of waste materials caused by shutdown is reduced, and the production efficiency is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum processing, and more particularly to an aluminum alloy coil quenching process with good continuity. Background Art

[0002] Aluminum coil is a metal product that is rolled and bent by a casting mill before being sheared. Aluminum coil is widely used in electronics, packaging, construction, machinery, etc. There are many aluminum coil production companies in my country. Quenching is a heat treatment process method that heats aluminum to above the critical temperature, keeps it warm for a certain period of time, and then cools it at a cooling rate greater than the critical cooling rate to obtain an unbalanced structure dominated by martensite (there are also bainites or single-phase austenites as needed). Quenching is the most widely used process method in aluminum heat treatment. There are four basic processes for heat treatment: annealing, normalizing, quenching, and tempering.

[0003] A Chinese invention patent with application number CN201010582479.6 discloses a quenching plate coil quenching production method and device, the method comprising: rotating an uncoiler to unwind the aluminum coil on the uncoiler; using a disc shear to cut the edge of the unrolled aluminum coil to make the aluminum coil reach a specified width; connecting the tail of the aluminum coil with the head of the next aluminum coil to form an aluminum strip; using a cleaning liquid to remove impurities on the surface of the aluminum strip; heating the aluminum strip to a preset temperature and keeping it warm for a preset time; using a coolant to cool the aluminum strip from the preset temperature to below 40°C to obtain a supersaturated strengthening phase; volatilizing water on the surface of the aluminum strip; and using continuous stretching and bending. Although it can solve the problems of quenching deformation and straightening, enable industrialized production of products, and make the products better in terms of organizational performance, however, when sewing the aluminum strip, the quenching production method uses a fixed sewing mechanism, which will cause the production line to stop and the overall efficiency of the production line to decrease, resulting in poor continuity of the entire production line. In addition, before sewing, the aluminum strip has large bows and side waves, which greatly increases the difficulty of sewing the aluminum strip.

[0004] Therefore, it is necessary to propose an aluminum alloy coil quenching process with good continuity to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that when the existing quenching production method is used to sew the aluminum strip, the fixed sewing mechanism is used to sew, which will cause the production line to stop, the overall efficiency of the production line to decrease, and the continuity of the entire production line to be poor. In addition, before sewing, the difficulty of sewing the aluminum strip is greatly increased due to the large bow and edge waves of the aluminum strip.

[0006] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0007] A continuous aluminum alloy coil quenching process comprises the following steps:

[0008] Step 1: unwinding the aluminum alloy coil to form an aluminum strip;

[0009] Step 2: Rough straightening: Rough straightening the aluminum material after uncoiling;

[0010] Step 3: Mobile stitching: stitching the tail of the unfolded aluminum coil with the head of the next aluminum coil by a mobile stitching machine;

[0011] Step 4: heating: heating the aluminum material after rough straightening through a heating furnace;

[0012] Step 5: spray quenching, spray quenching the heated aluminum strip;

[0013] Step 6: Fine straightening 1: fine straightening the aluminum material after heating and quenching;

[0014] Step 7: Transmission: The aluminum strip after fine straightening is transmitted through a long-distance loop;

[0015] Step 8: Fine correction 2: Fine correction is performed again on the aluminum strip passed through step 6;

[0016] Step nine: excision, excision is performed on the position sutured in step three;

[0017] Step 10: coiling the aluminum material after fine straightening in step 7;

[0018] The overall line speed of the quenching process from step 1 to step 10 is 5-25 m / min, and the line speed is reduced as the thickness of the aluminum strip before unwinding increases.

[0019] Furthermore, before uncoiling the aluminum alloy coil in step one, the incoming aluminum alloy coil is inspected for plate shape, wherein the bow and edge waves must be less than or equal to 5 cm, the coil diameter of the aluminum alloy coil is 2.2-2.4 m, and the thickness of the aluminum strip is 4-22 cm.

[0020] Furthermore, the bow and edge waves of the aluminum strip after rough straightening in step 2 are less than or equal to 3 cm, and the thickness of the aluminum strip is 2-11 cm.

[0021] Furthermore, in the step three, the mobile sewing machine moves in a certain direction as the overall quenching process proceeds, and the moving speed matches the overall linear speed of the quenching process. The mobile sewing machine can sew a thickness of 4-22 mm.

[0022] Furthermore, the heating furnace in step 4 is a roller-bottom heating furnace, the combustion medium of the heating furnace is natural gas, and it is used to heat both the upper and lower surfaces of the aluminum strip, and distribute different amounts of heat to the upper and lower surfaces of the aluminum strip.

[0023] Furthermore, the overall temperature of the heating quenching furnace is set at 500-600°C, which is divided into three zones, namely 2 low-temperature zones, 2-3 medium-temperature zones and 2-3 high-temperature zones. The temperature of the low-temperature zone is set at 508±3°C, the temperature of the medium-temperature zone is set at 552±5°C, and the temperature of the high-temperature zone is set at 594±2°C.

[0024] Furthermore, in step five, the distance between the spray quenching and the heating furnace is within 40 mm.

[0025] Furthermore, during the fine straightening in step six and step eight, a straightening machine that can be lifted quickly is used for straightening, and after the secondary fine straightening, the bow and edge wave shape of the aluminum strip are 0-3mm.

[0026] Furthermore, the overall length of the loop is 4m.

[0027] Furthermore, the heating furnace is formed by connecting a plurality of furnace bodies, wherein the furnace body is provided with two sets of upper and lower heating mechanisms, the heating mechanisms are supplied with gas by a burner arranged above the furnace body, and the furnace body between the heating mechanisms is provided with conveying rollers for passing aluminum materials;

[0028] The furnace body is provided with a main air pipe connected with the burner outlet from top to bottom, and the middle and bottom of the main air pipe are respectively provided with branch air pipes connected with the air inlets of the two groups of heating mechanisms. A return pipe is provided on the upper part of the main air pipe, and a circulating fan is provided at the end of the return pipe away from the main air pipe.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The quenching process provided by the present invention can effectively increase the continuity of the process, thereby reducing the generation of waste caused by shutdown and effectively improving production efficiency.

[0031] 2. The present invention adopts a mobile stitching process, which allows the tail of the aluminum coil to be stitched with the head of the next aluminum coil without stopping the machine, thereby avoiding the overall shutdown of the production line.

[0032] 3. The present invention can achieve straightening of the aluminum strip through two fine straightenings. At the same time, through the setting of the loop, a buffer section can be provided between the fine straightening one and the fine straightening two to ensure the straightening effect of the final fine straightening two, so that the final rolled aluminum strip is flatter.

[0033] 4. The present invention, through the setting of a dynamic boosting mechanism, can make the pressure in the gas chamber change in real time, while ensuring the continuity of gas coming out of the burner, thereby ensuring the heating efficiency of the aluminum material. At the same time, through the setting of a circulating fan, the hot air in the furnace body can be reused, which is energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a front view schematic diagram of the structure of the present invention;

[0035] Figure 2 It is a cross-sectional schematic diagram of the structure of the present invention;

[0036] Figure 3 It is a three-dimensional cross-sectional schematic diagram of the structure of the present invention;

[0037] Figure 4 It is a three-dimensional top view schematic diagram of the structure of the present invention;

[0038] Figure 5 For the present invention Figure 2 Enlarged schematic diagram at point A in the middle.

[0039] Figure numerals: 1. furnace body; 2. burner; 3. main gas pipe; 4. gas distribution pipe; 5. gas chamber; 6. burner; 7. conveying roller; 8. aluminum material; 9. return pipe; 10. circulating fan; 11. square ring top cover; 12. pressure frame; 13. mounting shaft; 14. gear; 15. cam; 16. first T-bar; 17. first spring; 18. guide rail; 19. slide groove; 20. transmission plate; 21. rack; 22. through groove; 23. cylinder; 24. sliding bar; 25. lifting plate; 26. second T-bar; 27. second spring; 28. diverter plate; 30. transmission block; 31. arc groove. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] See also Figure 1-4 A continuous aluminum alloy coil quenching process comprises the following steps:

[0042] Step 1: Unwind the aluminum alloy coil to form an aluminum strip. Before unwinding the aluminum alloy coil, the incoming aluminum alloy coil is tested for shape. The bow and edge waves must be less than or equal to 5 cm, the aluminum alloy coil diameter is 2.2-2.4 m, and the aluminum strip thickness is 4-22 cm.

[0043] Step 2: Rough straightening: Rough straightening the aluminum strip after uncoiling. The bow and edge waves of the aluminum strip after rough straightening are less than or equal to 3cm, and the thickness of the aluminum strip is 2-11cm;

[0044] Step 3: Mobile stitching: The tail of the unfolded aluminum coil is stitched with the head of the next aluminum coil by a mobile stitching machine. The mobile stitching machine moves in a certain direction as the overall quenching process proceeds, and the moving speed matches the overall linear speed of the quenching process. The mobile stitching machine can stitch a thickness of 4-22mm.

[0045] Step 4: Heating: The aluminum material after rough straightening is heated by a heating furnace. The heating furnace adopts a roller bottom heating furnace. The combustion medium of the heating furnace is natural gas. It is used to heat the upper and lower surfaces of the aluminum strip, and different heat is allocated to the upper and lower surfaces of the aluminum strip. The overall temperature of the heating quenching furnace is set at 500-600°C. It is divided into three zones, namely 2 low-temperature zones, 2-3 medium-temperature zones and 23 high-temperature zones. The temperature of the low-temperature zone is set at 508±3°C, the temperature of the medium-temperature zone is set at 552±5°C, and the temperature of the high-temperature zone is set at 594±2°C.

[0046] Step 5: spray quenching: spray quench the heated aluminum strip. The distance between the spray quenching and the heating furnace should be within 40 mm. It does not need to be too far away to prevent the heated aluminum strip from deforming at room temperature.

[0047] Step 6: Fine straightening 1: fine straightening the aluminum material after heating and quenching. During fine straightening, a straightening machine 7 that can be lifted quickly is used for straightening;

[0048] Step 7: Transmission: The aluminum strip after fine straightening is transmitted through a long-distance loop. The overall length of the loop is 4m and it is composed of multiple rollers. It is used to transmit the aluminum strip and provide a certain buffer section for the two fine straightenings to reduce equipment downtime.

[0049] Step 8, fine straightening 2, the aluminum strip that has passed through step 6 is finely straightened again. During fine straightening, a fast-lifting straightener 7 is used for straightening. After the second fine straightening, the bow and edge wave shape of the aluminum strip are 0.3 mm. When the seam passes through fine straightening 1 and fine straightening 2, the straightener 7 needs to be lifted to make the seam pass quickly and reset after passing, so as to realize continuous straightening of the subsequent aluminum strips;

[0050] Step nine: excision, excision is performed on the position sutured in step three;

[0051] Step 10: Reeling: Reel the aluminum material after fine straightening in step 7, wherein the cutting process is at a certain distance from the reeling process, so that the corresponding manipulator can transfer the reeled aluminum coil and replace the new aluminum cylinder for winding, thereby avoiding the overall equipment shutdown again;

[0052] The overall line speed of the quenching process from step 1 to step 10 is 5-25 m / min, and the line speed is slowed down as the thickness of the aluminum strip before unwinding increases.

[0053] See also Figure 1-5 In order to further achieve a better heating effect, an energy-saving and environmentally friendly aluminum strip heating furnace is also included, including a heating furnace, which is formed by connecting multiple furnace bodies 1. The temperatures in the multiple furnace bodies 1 are different and are set accordingly according to the corresponding series of aluminum alloys. In addition, compared with the traditional furnace body, two sets of upper and lower heating mechanisms are arranged in the furnace body 1. The heating mechanism is supplied with gas by a burner 2 arranged above the furnace body 1. The burner 2 uses natural gas as a raw material for combustion, with low energy consumption and environmental protection. Conveying rollers 7 for aluminum materials to pass through are arranged on the furnace bodies 1 between the heating mechanisms. The conveying rollers 7 are arranged at the end of each furnace body 1 and do not affect the heating of the aluminum material 8 by the heating mechanism.

[0054] In this embodiment, by setting up a dynamic pressurizing mechanism, the pressure in the gas chamber 5 can be changed in real time, while ensuring the continuity of gas coming out of the burner 6, thereby ensuring the heating efficiency of the aluminum material 8.

[0055] Specific, combined Figure 1-3 As shown, the furnace body 1 is provided with a main gas pipe 3 connected with the gas outlet of the burner 2 from top to bottom, and the middle and bottom of the main gas pipe 3 are respectively provided with gas branch pipes 4 connected with the air inlets of the two groups of heating mechanisms. The burner 2 transports the heated natural gas to the main gas pipe 3, and then the main gas pipe 3 enters the corresponding gas branch pipe 4 through the diverter valve. In order to further facilitate the utilization of energy, a return pipe 9 is provided on the upper part of the main gas pipe 3, and a circulating fan 10 is provided at the end of the return pipe 9 away from the main gas pipe 3, and the hot air in the furnace body 1 is recycled by the circulating fan 10.

[0056] Specific, combined Figure 1-3 As shown, each group of heating mechanisms includes a gas chamber 5, a dynamic pressurizing mechanism and a plurality of burners 6. The gas chamber 5 is used for temporarily storing gas for gas circulation through the burners 6. The gas chamber 5 is fixedly connected to one end of the gas distribution pipe 4 away from the main gas pipe 3. The burners 6 are fixedly connected to the side of the gas chamber 5 facing the aluminum material 8. The dynamic pressurizing mechanism is arranged on the side of the gas chamber 5 facing away from the burners 6, so that the dynamic pressurizing mechanism can change the pressure in the gas chamber 5 in real time, thereby promoting the suction and discharge of the gas in the gas distribution pipe 4.

[0057] Specifically, combined with Figure 2 , 3As shown in Figure 5, the dynamic pressurizing mechanism includes a driving mechanism, a square ring top cover 11 and a pressure frame 12. The square ring top cover 11 is fixedly connected to the end of the gas chamber 5 facing away from the burner 6. The square ring top cover 11 is fixedly connected to the side of the burner 6 with a first square ring plate, and the end of the first square ring plate away from the square ring top cover 11 is fixedly connected to the side of the inner wall of the gas chamber 5 with a second square ring plate, the inner wall of the side wall of the pressure frame 12 fits the end of the second square ring plate facing the inner wall of the gas chamber 5, and the end of the pressure frame 12 facing the square ring top cover 11 is fixedly connected to a third square ring plate facing the first square ring plate, and the end of the second square ring plate facing the first square ring plate is set as a sealing gasket to prevent gas leakage. Through the coordination between the first square ring plate, the second square ring plate and the third square ring plate, on the one hand, the pressure frame 12 can be prevented from detaching from the square ring top cover 11, and on the other hand, gas can be prevented from leaking from the connection between the pressure frame 12, the second square ring plate and the third square ring plate. The driving mechanism is set on the square ring top cover 11, and is used to drive the pressure frame 12 to slide up and down.

[0058] Specifically, the driving mechanism includes a pressing component and a restoring component. The pressing component is used to press the pressing frame 12 downward toward the side of the burner 6, and the restoring component is used to drive the pressing frame 12 to restore the initial position.

[0059] Specific, combined Figure 2 , 3 As shown in FIG. 5 , there are four recovery components, which are arranged at the four corners of the pressing frame 12 to ensure the stability of the pressing frame 12 during the recovery process. Each recovery component includes a first T-shaped rod 16 and a first spring 17. Figure 2 , 3 The first spring 17 shown in 5 is in a state without being acted upon by external force, the upper end of the first T-bar 16 is fixed on the square ring top cover 11, the lower end of the first T-bar 16 is in contact with the pressing frame 12, the first spring 17 is sleeved on the outside of the first T-bar 16, one end of the first spring 17 is fixed on the upper end of the first T-bar 16, and the other end of the first spring 17 is fixed on the pressing frame 12.

[0060] Specific, combined Figure 2-4 As shown, the pressing assembly includes a driving assembly, a mounting shaft 13, a gear 14 and a cam 15. The mounting shaft 13 is rotatably connected to the side of the second square ring plate facing the center of the gas chamber 5. In order to ensure the stability of the pressing, the mounting shaft 13 and the structure on the mounting shaft 13 are set as two groups. The cam 15 is fixedly connected to the outer wall of the mounting shaft 13, and the gear 14 is fixedly connected to the end of the mounting shaft 13 by a key. The driving assembly is used to drive the gear 14 to rotate, so that the mounting shaft 13 drives the convex point of the cam 15 to press the pressing frame 12. When the convex point end of the cam 15 contacts the pressing frame 12, the pressing frame 12 moves down to the extreme position. When the end opposite to the convex point of the cam 15 fits the pressing frame 12, it is the initial position of the pressing frame 12.

[0061] Specific, combined Figure 2-4 As shown, the driving assembly includes a transmission plate 20, a rack 21 and a cylinder 23. The transmission plate 20 is slidably connected to the upper end of the square ring top cover 11, the rack 21 is fixedly connected to the lower end of the transmission plate 20, and the rack 21 is meshed with the gear 14. The cylinder 23 is fixedly connected to the square ring top cover 11, and the output end of the cylinder 23 is fixedly connected to the transmission plate 20, which is used to drive the transmission plate 20 to slide back and forth. Due to the setting of using the cylinder 23 to drive, when the cylinder 23 is extended to the longest, the convex point of the cam 15 just contacts the pressure frame 12, and the cylinder 23 will shrink at this time.

[0062] Specific, combined Figure 1-4 As shown, a guide rail 18 is fixedly connected to the upper end of the square ring top cover 11, and a slide groove 19 is opened in the horizontal direction of the guide rail 18. A sliding bar 24 is fixedly connected to the transmission plate 20 on one side facing the guide rail 18, and the sliding bar 24 is slidably connected in the slide groove 19. A through groove 22 parallel to the slide groove 19 is opened on the transmission plate 20, and the cylinder 23 is fixedly connected to the transmission plate 20 in the through groove 22. The distance between the through groove 22 away from the output end of the cylinder 23 and the fixed end of the cylinder 23 is equal to the extendable distance of the cylinder 23, so that when the cylinder 23 is extended to the longest, the convex point of the cam 15 just contacts the pressure frame 12.

[0063] Specific, combined Figure 1-4 As shown, in order to further promote the circulation efficiency of the circulation fan 10, a plurality of second T-shaped rods 26 are fixedly connected to the bottom of the furnace body 1, and a lifting plate 25 is slidably connected to the outer wall of the second T-shaped rod 26. The edge of the lifting plate 25 fits the inner wall of the furnace body 1 to ensure the efficiency of lifting the gas. In addition, in order to enable the lifting plate 25 to automatically reset, a second spring 27 sleeved on the outer side of the second T-shaped rod 26 is provided between the upper side of the lifting plate 25 and the upper end of the second T-shaped rod 26. Figure 1-4 The second spring 27 shown in the figure is in a stretched state, and the two ends of the second spring 27 are respectively fixed to the upper side surface of the lifting plate 25 and the upper end of the second T-bar 26, and the middle part of the lifting plate 25 is fixedly connected with a diverter plate 28, and the cross-section of the diverter plate 28 is an obtuse isosceles triangle, so that the gas pressed down by the pressure frame 12 can be diverted to both sides through the diverter plate 28, and then the lifting plate 25 is driven by the restoring force of the second spring 27 to lift the gas upward, and the upper end of the diverter plate 28 is fixedly connected with a transmission block 30, and the upper end of the transmission block 30 is provided with an arc groove 31 for cooperating with the cam 15 under the aluminum material 8, and the outer wall of the cam 15 always fits the arc groove 31. Since the cylinder 23 is used for driving, the convex point of the cylinder 23 can only move along half of the arc groove 31.

[0064] Working principle: When the aluminum material 8 passes through the heating furnace, the burner 2 disperses the hot gas from the combustion into the corresponding gas chamber 5 through the main gas pipe 3 and the gas distribution pipe 4. As the cylinder 23 contracts, the sliding bar 24 on the transmission plate 20 is driven to slide in the slide groove 19, so that the rack 21 drives the gear 14 to rotate, thereby driving the mounting shaft 13 and the cam 15 to rotate, so that the convex point of the cam 15 presses the pressing frame 12, and at the same time, the pressing frame 12 will stretch the first spring 17, so that the pressing frame 12 slides along the second square ring, and at the same time, the pressing frame 12 will press down the gas in the gas chamber 5 to promote the gas to be ejected from the burner 6. As the cylinder 23 contracts, the convex point of the cam 15 will leave the pressing frame 12, and under the action of the first spring 17, the pressing frame 12 is driven to reset. At this time, the pressing frame 1 above the furnace body 1 2 will drive the gas above to enter the circulation fan 10, the pressure frame 12 under the furnace body 1 will press down the gas under the pressure frame 12, so that the air will impact the diverter plate 28, and the gas will be diverted by the diverter plate 28. After the convex point of the cam 15 enters the arc groove 31, it will press down the transmission block 30, so that the transmission block 30 drives the lifting plate 25 to move downward. As the cylinder 23 extends, the convex point of the cam 15 will be separated from the arc groove 31. At this time, under the action of the second spring 27, the lifting plate 25 is driven to move upward, so that the lifting plate 25 lifts the gas above the lifting plate 25 upward, thereby promoting the gas in the furnace body 1 to enter the circulation fan 10, so that the circulation fan 10 circulates the gas to the return pipe 9, and then flows into the corresponding gas cavity 5 through the main gas pipe 3 and the gas distribution pipe 4.

[0065] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A continuous aluminum alloy coil quenching process, characterized in that: The following steps are involved: Step 1: unwinding the aluminum alloy coil to form an aluminum strip; Step 2: Rough straightening: Rough straightening of the aluminum material after uncoiling; Step 3: Mobile stitching: stitching the tail of the unfolded aluminum coil with the head of the next aluminum coil by a mobile stitching machine; Step 4: heating: heating the aluminum material after rough straightening through a heating furnace; Step 5: spray quenching, spray quenching the heated aluminum strip; Step 6: Fine straightening 1: fine straightening the aluminum material after heating and quenching; Step 7: Transmission: The aluminum strip after fine straightening is transmitted through a long-distance loop; Step 8: Fine correction 2: Fine correction is performed again on the aluminum strip passed through step 6; Step nine: excision, excision is performed on the position sutured in step three; Step 10: coiling, coiling the aluminum material after fine straightening in step 7; The overall line speed of the quenching process from step 1 to step 10 is 5-25 m / min, and the line speed is reduced as the thickness of the aluminum strip before unwinding increases.

2. The aluminum alloy coil quenching process with good continuity according to claim 1, characterized in that: Before uncoiling the aluminum alloy coil in step 1, the incoming aluminum alloy coil is inspected for plate shape, wherein the bow and edge wave must be less than or equal to 5 cm, the coil diameter of the aluminum alloy coil is 2.2-2.4 m, and the thickness of the aluminum strip is 4-22 cm.

3. The aluminum alloy coil quenching process with good continuity according to claim 1, characterized in that: After the rough straightening in step 2, the bow and edge waves of the aluminum strip are less than or equal to 3 cm, and the thickness of the aluminum strip is 2-11 cm.

4. The aluminum alloy coil quenching process with good continuity according to claim 1, characterized in that: In the step three, the mobile sewing machine moves in a certain direction as the overall quenching process proceeds, and the moving speed matches the overall linear speed of the quenching process. The mobile sewing machine can sew a thickness of 4-22 mm.

5. The aluminum alloy coil quenching process with good continuity according to claim 1, characterized in that: The heating furnace in step 4 is a roller-bottom heating furnace whose combustion medium is natural gas and is used to heat both the upper and lower surfaces of the aluminum strip and distribute different amounts of heat to the upper and lower surfaces of the aluminum strip.

6. The aluminum alloy coil quenching process with good continuity according to claim 5, characterized in that: The overall temperature of the heating quenching furnace is set at 500-600°C, which is divided into three zones, namely 2 low-temperature zones, 2-3 medium-temperature zones and 2-3 high-temperature zones. The temperature of the low-temperature zone is set at 508±3°C, the temperature of the medium-temperature zone is set at 552±5°C, and the temperature of the high-temperature zone is set at 594±2°C.

7. The aluminum alloy coil quenching process with good continuity according to claim 1, characterized in that: In step five, the distance between the spray quenching process and the heating furnace is within 40 mm.

8. The aluminum alloy coil quenching process with good continuity according to claim 1, characterized in that: During the fine straightening in step six and step eight, a straightening machine that can be lifted quickly is used for straightening. After the second fine straightening, the bow and edge wave shape of the aluminum strip are 0-3mm.

9. The aluminum alloy coil quenching process with good continuity according to claim 1, characterized in that: The overall length of the loop is 4m.

10. The aluminum alloy coil quenching process with good continuity according to claim 1, characterized in that: The heating furnace is formed by connecting a plurality of furnace bodies, wherein two sets of upper and lower heating mechanisms are arranged in the furnace body, and the heating mechanisms are supplied with gas by a burner arranged above the furnace body, and conveying rollers for passing aluminum materials are arranged on the furnace body between the heating mechanisms; The furnace body is provided with a main air pipe connected with the burner outlet from top to bottom, and the middle and bottom of the main air pipe are respectively provided with branch air pipes connected with the air inlets of the two groups of heating mechanisms. A return pipe is provided on the upper part of the main air pipe, and a circulating fan is provided at the end of the return pipe away from the main air pipe.

Images