A heat treatment production method for aluminum alloy coils

Abstract

A heat treatment production method for aluminum alloy coils of the present invention includes the following steps: (1) taking aluminum alloy coils; (2) loading into the furnace; (3) finished product annealing process; (4) heating up and discharging. The present invention uses aluminum alloy coils in alloy state 5052H32, aluminum alloy coils in alloy state 5052 - O, and aluminum alloy coils in alloy state 3003H24 as raw materials, optimizes the heat treatment process of aluminum alloy coils, so that three aluminum alloy coils with different annealing processes can be produced in the same furnace; when producing scattered orders, the production efficiency is high, and the production time of three aluminum alloy coils with different processes is 22 - 24 hours, which is time-saving and efficient; taking the maximum furnace loading capacity of the heat treatment furnace as 80 tons as an example, the furnace loading capacity can reach 75 tons, and the heat treatment production efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum alloy sheet processing, and particularly relates to a heat treatment production method for aluminum alloy coils. Background Art

[0002] Aluminum alloy heat treatment technology is a technology that selects a certain heat treatment specification, controls the heating rate to a certain corresponding temperature during the heat treatment of aluminum alloy products, holds for a certain time, and cools at a certain speed to change the structure and organization of its alloy. After aluminum alloy is quenched, its strength and hardness do not immediately increase. Instead of decreasing, its plasticity even increases to some extent. However, for this quenched alloy, after being placed for a period of time (such as 4 to 6 days and nights), its strength and hardness will increase significantly, while its plasticity will decrease significantly. The phenomenon that the strength and hardness of quenched aluminum alloy increase significantly with time is called aging. Aging can occur at room temperature, which is called natural aging, or it can occur within a certain temperature range higher than room temperature (such as 100 - 200 °C), which is called artificial aging. The age hardening of aluminum alloy is a rather complex process, which not only depends on the composition of the alloy and the aging process, but also on the defects caused during the production process of the alloy, especially the number and distribution of vacancies and dislocations, etc. It is generally believed that age hardening is the result of the segregation of solute atoms to form hardening zones. When aluminum alloy is heated during quenching, vacancies are formed in the alloy. During quenching, due to the fast cooling rate, these vacancies have no time to move out and are "fixed" in the crystal lattice. Most of these vacancies in the supersaturated solid solution are combined with solute atoms. Since the supersaturated solid solution is in an unstable state, it must transform to an equilibrium state. The existence of vacancies accelerates the diffusion rate of solute atoms, thus accelerating the segregation of solute atoms. The size and number of hardening zones depend on the quenching temperature and the quenching cooling rate. The higher the quenching temperature, the greater the vacancy concentration, the more the number of hardening zones, and the smaller the size of the hardening zones. The greater the quenching cooling rate, the more vacancies fixed in the solid solution, which is beneficial to increasing the number of hardening zones and reducing the size of the hardening zones. A basic characteristic of precipitation hardening alloy systems is the equilibrium solid solubility that changes with temperature, that is, the solid solubility increases with increasing temperature. Most heat-treatable aluminum alloys meet this condition.

[0003] At present, the heat treatment furnace for aluminum alloy coils is generally a box-type heat treatment furnace. There are 3 zones in the furnace, and 3 coils can be produced simultaneously in one furnace. With the development of the industry, the equipment specifications and dimensions of aluminum processing enterprises are getting larger and larger. The single-coil weight of aluminum alloy coils has increased from the original 5 - 10 tons to 15 - 30 tons, and the maximum loading capacity of the heat treatment furnace has also increased from the original 20 - 40 tons to the current 50 - 80 tons. However, the single-specification order quantity of customers is generally 10 to 30 tons, resulting in the situation of single-coil annealing production frequently, which seriously affects the production efficiency of heat treatment. Summary of the Invention

[0004] Aiming at the problem that only aluminum alloy coils with the same annealing process can be produced in the same furnace in the existing technology, and the production efficiency is low when producing scattered orders, the purpose of the present invention is to provide a heat treatment production method for aluminum alloy coils. One furnace can produce 1-3 aluminum alloy coils with different annealing processes. The production time of aluminum alloy coils with different processes is 24 hours, and the loading capacity can reach 75 tons, and the production efficiency of scattered orders is high.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A heat treatment production method for aluminum alloy coils, the method comprising the following steps:

[0006] (1) Taking aluminum alloy coils: Taking aluminum alloy coils in alloy state 5052H32, aluminum alloy coils in alloy state 5052-O, and aluminum alloy coils in alloy state 3003H24;

[0007] (2) Loading into the furnace: The heat treatment furnace is sequentially provided with a heat treatment furnace zone 3, a heat treatment furnace zone 2, and a heat treatment furnace zone 1 from the inside of the furnace chamber to the furnace door position; Loading into the furnace in the order of decreasing metal temperature; The aluminum alloy coils in the alloy state 5052H32 are loaded into the heat treatment furnace zone 2, the aluminum alloy coils in the alloy state 5052-O are loaded into the heat treatment furnace zone 3, and the aluminum alloy coils in the alloy state 3003H24 are loaded into the heat treatment furnace zone 1;

[0008] (3) Finished product annealing process: The finished product annealing process of the aluminum alloy coils in the alloy state 5052H32 is to keep the metal temperature at 270 °C for 2 hours; The finished product annealing process of the aluminum alloy coils in the alloy state 5052-O is to keep the metal temperature at 320 °C for 2 hours; The finished product annealing process of the aluminum alloy coils in the alloy state 3003H24 is to keep the metal temperature at 240 °C for 3 hours;

[0009] (4) Heating up and discharging:

[0010] Heating up 1: The metal temperature rises to 238-242 °C and is kept warm for 2.8-3.2 hours;

[0011] Discharging 1: The aluminum alloy coils in the alloy state 3003H24 are discharged from the furnace;

[0012] Heating up 2: The metal temperature rises to 268-272 °C and is kept warm for 1.8-2.2 hours;

[0013] Discharging 2: The aluminum alloy coils in the alloy state 5052H32 are discharged from the furnace;

[0014] Heating up 3: The metal temperature rises to 318-322 °C and is kept warm for 1.8-2.2 hours;

[0015] Discharging 3: The aluminum alloy coils in the alloy state 5052-O are discharged from the furnace.

[0016] Further, in the step (1), the weight ratio of the aluminum alloy coil in the alloy state 5052H32, the aluminum alloy coil in the alloy state 5052-O, and the aluminum alloy coil in the alloy state 3003H24 is 1:1:1.

[0017] Further, taking the maximum furnace loading capacity of the heat treatment furnace as 80 tons in the step (1) as an example, 25 tons of each of the aluminum alloy coil in the alloy state 5052H32, the aluminum alloy coil in the alloy state 5052-O, and the aluminum alloy coil in the alloy state 3003H24 are taken.

[0018] Further, when loading the furnace in the step (2), holes are drilled at 5 - 6 mm from the inner circle of each aluminum alloy coil to place thermocouples to measure the metal temperature.

[0019] Further, in the step (2), baffle plates are placed outside the racks in Zone 3 and Zone 2 of the heat treatment furnace respectively to make the furnace gas in each zone more stable.

[0020] Further, the baffle plates are placed along the width direction of the heat treatment furnace. The width of the baffle plates is 100 - 200 mm smaller than the width of the furnace chamber, and the height of the baffle plates is as high as possible without hindering the aluminum alloy coils from being taken out of the furnace.

[0021] Further, in the step (4), during Heating 1 to Heating 3, the furnace gas temperature is set to the metal temperature + 40 - + 80 °C. When the metal temperature rises to 10 - 15 °C below the target temperature, the furnace gas temperature is changed to the target metal temperature.

[0022] Further, in the step (4), for Heating 1: the metal temperature rises to 240 - 242 °C and is held for 2.8 - 3.2 hours.

[0023] Further, in the step (4), for Heating 2: the metal temperature rises to 270 - 272 °C and is held for 1.8 - 2.2 hours.

[0024] Further, in the step (4), for Heating 3: the metal temperature rises to 320 - 322 °C and is held for 1.8 - 2.2 hours.

[0025] A heat treatment production method for aluminum alloy coils. Aiming at the problem that only aluminum alloy coils with the same annealing process can be produced in the same furnace in the existing technology, and the production efficiency is low when producing scattered orders, this application uses aluminum alloy coils in alloy state 5052H32, aluminum alloy coils in alloy state 5052-O, and aluminum alloy coils in alloy state 3003H24 as raw materials, optimizes the heat treatment process of aluminum alloy coils, so that 3 aluminum alloy coils with different annealing processes can be produced in the same furnace; the production efficiency is high when producing scattered orders, and the production time of 3 aluminum alloy coils with different processes is 24 hours, which is time-saving and efficient; taking the maximum loading capacity of the heat treatment furnace as 80 tons as an example, the loading capacity can reach 75 tons, and the heat treatment production efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of an annealing material rack with a baffle in the present invention; in the figure, the reference numerals: 1. Annealing material rack 1 in area 1 of the heat treatment furnace; 2. Annealing material rack 2 in area 2 of the heat treatment furnace; 21. Baffle on annealing material rack 2; 3. Annealing material rack 3 in area 3 of the heat treatment furnace; 31. Baffle on annealing material rack 3.

[0027] Figure 2 It is a picture of an annealing material rack in the prior art. DETAILED DESCRIPTION OF THE INVENTION

[0028] The following embodiments can help those skilled in the art to more comprehensively understand the present invention, but cannot limit the present invention in any way.

[0029] A heat treatment production method for aluminum alloy coils in the present invention, in step (2), area 3 of the heat treatment furnace is located inside the furnace chamber, area 2 of the heat treatment furnace is located in the middle of the furnace chamber, and area 1 of the heat treatment furnace is located near the furnace door.

[0030] A heat treatment production method for aluminum alloy coils in the present invention, in step (4), during heating 1 to heating 3, the furnace gas temperature is set to the metal temperature + 40 - 80 °C. When the metal temperature rises to 10 - 15 °C below the target temperature, the furnace gas temperature is changed to the target metal temperature; it means that the furnace gas temperature is set 40 - 80 °C above the metal temperature. When the metal temperature rises to 10 - 15 °C below the target temperature, the furnace gas temperature is changed to the target metal temperature.

[0031] Taking heating 1 as an example, if the metal temperature is 240 °C, the furnace gas temperature is set to 280 - 320 °C; when the metal temperature rises to 225 - 230 °C, the furnace gas temperature is set to 240 °C.

[0032] A heat treatment production method for aluminum alloy coils. In this application, three annealing racks are composed of three separate racks, and the racks are separated from each other, which is convenient for separately taking out aluminum alloy coils in alloy state 5052H32, aluminum alloy coils in alloy state 5052 - O, and aluminum alloy coils in alloy state 3003H24. Specifically, as shown in Figure 1 ; The existing annealing racks are integrated, specifically as shown in Figure 2 . Such a return rack makes it very difficult for the coils to be taken out separately and cannot be applied to the method in this application.

[0033] A heat treatment production method for aluminum alloy coils. Baffle plates are placed outside the racks in Zone 3 and Zone 2 of the heat treatment furnace respectively. The installation diagram of the baffle plates is as shown in Figure 1 ; The baffle plates are placed along the width direction of the heat treatment furnace. The width of the baffle plates is 100 - 200 mm smaller than the width of the furnace chamber. The height of the baffle plates is as high as possible without hindering the aluminum alloy coils from being taken out of the furnace. More specifically, the height of the baffle plates is equal to the distance from the furnace top to the bottom of the rack after the rack is placed in the furnace chamber minus the lifting height when the rack enters and exits the furnace and then minus 150 - 240 mm. The purpose of placing baffle plates outside the racks in Zone 3 and Zone 2 of the heat treatment furnace respectively is to make the furnace gas in each zone more stable.

[0034] Example 1:

[0035] A heat treatment production method for aluminum alloy coils, the method comprising the following steps:

[0036] (1) Taking aluminum alloy coils: Take 25 tons each of aluminum alloy coils in alloy state 5052H32, aluminum alloy coils in alloy state 5052 - O, and aluminum alloy coils in alloy state 3003H24; The weight ratio of the aluminum alloy coils in alloy state 5052H32, the aluminum alloy coils in alloy state 5052 - O, and the aluminum alloy coils in alloy state 3003H24 is 1:1:1;

[0037] (2) Loading the furnace: The maximum loading capacity of the heat treatment furnace is 80 tons; The heat treatment furnace is sequentially provided with Zone 3, Zone 2, and Zone 1 of the heat treatment furnace from inside the furnace chamber to the furnace door position; Loading is carried out in the order of decreasing metal temperature; The aluminum alloy coils in alloy state 5052H32 are loaded into Zone 2 of the heat treatment furnace, the aluminum alloy coils in alloy state 5052 - O are loaded into Zone 3 of the heat treatment furnace, and the aluminum alloy coils in alloy state 3003H24 are loaded into Zone 1 of the heat treatment furnace; The total loading amount is 75 tons;

[0038] When loading the furnace, thermocouples are placed by drilling holes at 5 mm from the inner circle of each aluminum alloy coil to measure the metal temperature; Baffle plates are also placed outside the racks in Zone 3 and Zone 2 of the heat treatment furnace respectively. The installation diagram of the baffle plates is as shown in Figure 1 ;

[0039] (3)Final annealing process: The final annealing process for the aluminum alloy coil in the 5052H32 temper state is to hold at a metal temperature of 270°C for 2 hours; the final annealing process for the aluminum alloy coil in the 5052-O temper state is to hold at a metal temperature of 320°C for 2 hours; the final annealing process for the aluminum alloy coil in the 3003H24 temper state is to hold at a metal temperature of 240°C for 3 hours;

[0040] (4)Heating up and discharging:

[0041] Heating up 1: Raise the metal temperature to 238°C and hold for 2.8 hours; during Heating up 1, the furnace gas temperature is set to the metal temperature + 40°C. When the metal temperature rises to 10°C below the target temperature, change the furnace gas temperature to the target metal temperature;

[0042] Discharging 1: Discharge the aluminum alloy coil in the 3003H24 temper state;

[0043] Heating up 2: Raise the metal temperature to 268°C and hold for 1.8 hours; during Heating up 2, the furnace gas temperature is set to the metal temperature + 40°C. When the metal temperature rises to 10°C below the target temperature, change the furnace gas temperature to the target metal temperature;

[0044] Discharging 2: Discharge the aluminum alloy coil in the 5052H32 temper state;

[0045] Heating up 3: Raise the metal temperature to 318°C and hold for 1.8 hours; during Heating up 3, the furnace gas temperature is set to the metal temperature + 40°C. When the metal temperature rises to 10°C below the target temperature, change the furnace gas temperature to the target metal temperature;

[0046] Discharging 3: Discharge the aluminum alloy coil in the 5052-O temper state.

[0047] The annealing qualification status of the aluminum alloy coils in the 5052H32 temper state, 5052-O temper state, and 3003H24 temper state in the above Example 1 is shown in Table 1 below:

[0048] Table 1 Annealing qualification status of each aluminum alloy coil

[0049]

[0050] Example 2:

[0051] A production method for heat treatment of aluminum alloy coils, the method comprising the following steps:

[0052] (1) Taking aluminum alloy coils: Take 25 tons each of aluminum alloy coils in alloy state 5052H32, aluminum alloy coils in alloy state 5052 - O, and aluminum alloy coils in alloy state 3003H24; the weight ratio of the aluminum alloy coils in alloy state 5052H32, the aluminum alloy coils in alloy state 5052 - O, and the aluminum alloy coils in alloy state 3003H24 is 1:1:1;

[0053] (2) Loading into the furnace: The maximum loading capacity of the heat treatment furnace is 80 tons; the heat treatment furnace is successively provided with heat treatment furnace zone 3, heat treatment furnace zone 2, and heat treatment furnace zone 1 from the inside of the furnace chamber to the furnace door position; load the furnace in the order of decreasing metal temperature; the aluminum alloy coils in alloy state 5052H32 are loaded into heat treatment furnace zone 2, the aluminum alloy coils in alloy state 5052 - O are loaded into heat treatment furnace zone 3, and the aluminum alloy coils in alloy state 3003H24 are loaded into heat treatment furnace zone 1; the total loading amount is 75 tons;

[0054] When loading into the furnace, drill holes at 6 mm from the inner circle of each aluminum alloy coil to place thermocouples to measure the metal temperature; also place baffle plates outside the material racks in heat treatment furnace zone 3 and heat treatment furnace zone 2 respectively, and the installation drawing of the baffle plates is as Figure 1 shown;

[0055] (3) Finished product annealing process: The finished product annealing process for the aluminum alloy coils in alloy state 5052H32 is to keep the metal temperature at 270 °C for 2 hours; the finished product annealing process for the aluminum alloy coils in alloy state 5052 - O is to keep the metal temperature at 320 °C for 2 hours; the finished product annealing process for the aluminum alloy coils in alloy state 3003H24 is to keep the metal temperature at 240 °C for 3 hours;

[0056] (4) Heating up and discharging:

[0057] Heating up 1: Raise the metal temperature to 242 °C and keep it for 3.2 hours; during heating up 1, set the furnace gas temperature to the metal temperature + 80 °C, and when the metal temperature rises to the target temperature - 15 °C, change the furnace gas temperature to the target metal temperature;

[0058] Discharging 1: The aluminum alloy coils in alloy state 3003H24 are discharged from the furnace;

[0059] Heating up 2: Raise the metal temperature to 272 °C and keep it for 2.2 hours; during heating up 2, set the furnace gas temperature to the metal temperature + 80 °C, and when the metal temperature rises to the target temperature - 15 °C, change the furnace gas temperature to the target metal temperature;

[0060] Discharging 2: The aluminum alloy coils in alloy state 5052H32 are discharged from the furnace;

[0061] Heating 3: The metal temperature rises to 322 °C and is held for 2.2 hours; during Heating 3, the furnace gas temperature is set to the metal temperature + 80 °C. When the metal temperature rises to the target temperature - 15 °C, the furnace gas temperature is changed to the target metal temperature;

[0062] Unloading 3: The aluminum alloy coil in the alloy state 5052 - O is unloaded from the furnace.

[0063] The annealing qualification status of the aluminum alloy coils in the alloy states 5052H32, 5052 - O, and 3003H24 in the above Example 2 is shown in Table 2 below:

[0064] Table 2 Annealing qualification status of each aluminum alloy coil

[0065]

[0066] The alloy state 5052H32 aluminum alloy coil, the alloy state 5052 - O aluminum alloy coil, and the alloy state 3003H24 aluminum alloy coil in the above Example 2 are annealed and qualified as shown in Table 2 below: Example 3:

[0067] A production method for heat - treating aluminum alloy coils, the method comprising the following steps:

[0068] (1) Taking aluminum alloy coils: Take 25 tons each of aluminum alloy coils in the alloy states 5052H32, 5052 - O, and 3003H24; the weight ratio of the aluminum alloy coils in the alloy states 5052H32, 5052 - O, and 3003H24 is 1:1:1;

[0069] (2) Loading into the furnace: The maximum loading capacity of the heat - treatment furnace is 80 tons; the heat - treatment furnace is sequentially provided with a heat - treatment furnace zone 3, a heat - treatment furnace zone 2, and a heat - treatment furnace zone 1 from the inside of the furnace chamber to the furnace door position; loading is carried out in the order of decreasing metal temperature; the aluminum alloy coil in the alloy state 5052H32 is loaded into the heat - treatment furnace zone 2, the aluminum alloy coil in the alloy state 5052 - O is loaded into the heat - treatment furnace zone 3, and the aluminum alloy coil in the alloy state 3003H24 is loaded into the heat - treatment furnace zone 1; the total loading amount is 75 tons;

[0070] When loading, holes are drilled at 5 mm from the inner circle of each aluminum alloy coil to place thermocouples to measure the metal temperature; partition plates are also placed outside the material racks in the heat - treatment furnace zone 3 and the heat - treatment furnace zone 2 respectively, and the installation diagram of the partition plates is as Figure 1 shown;

[0071] (3)Final annealing process: The final annealing process for the aluminum alloy coil in the 5052H32 temper is to hold at a metal temperature of 270°C for 2 hours; the final annealing process for the aluminum alloy coil in the 5052-O temper is to hold at a metal temperature of 320°C for 2 hours; the final annealing process for the aluminum alloy coil in the 3003H24 temper is to hold at a metal temperature of 240°C for 3 hours;

[0072] (4)Heating up and discharging:

[0073] Heating up 1: Raise the metal temperature to 240°C and hold for 3 hours; during Heating up 1, set the furnace gas temperature to the metal temperature + 60°C. When the metal temperature rises to the target temperature - 12°C, change the furnace gas temperature to the target metal temperature;

[0074] Discharging 1: Discharge the aluminum alloy coil in the 3003H24 temper;

[0075] Heating up 2: Raise the metal temperature to 270°C and hold for 2 hours; during Heating up 2, set the furnace gas temperature to the metal temperature + 60°C. When the metal temperature rises to the target temperature - 12°C, change the furnace gas temperature to the target metal temperature;

[0076] Discharging 2: Discharge the aluminum alloy coil in the 5052H32 temper;

[0077] Heating up 3: Raise the metal temperature to 320°C and hold for 2 hours; during Heating up 3, set the furnace gas temperature to the metal temperature + 60°C. When the metal temperature rises to the target temperature - 12°C, change the furnace gas temperature to the target metal temperature;

[0078] Discharging 3: Discharge the aluminum alloy coil in the 5052-O temper.

[0079] The annealing qualification of the aluminum alloy coils in the 5052H32 temper, 5052-O temper, and 3003H24 temper in the above Example 3 is shown in Table 3 below:

[0080] Table 3 Annealing qualification of each aluminum alloy coil

[0081]

[0082] Example 4:

[0083] A production method for heat treatment of aluminum alloy coils, the method comprising the following steps:

[0084] (1)Taking aluminum alloy coils: Take 25 tons each of aluminum alloy coils in alloy state 5052H32, aluminum alloy coils in alloy state 5052-O, and aluminum alloy coils in alloy state 3003H24; the weight ratio of the aluminum alloy coils in alloy state 5052H32, the aluminum alloy coils in alloy state 5052-O, and the aluminum alloy coils in alloy state 3003H24 is 1:1:1;

[0085] (2)Loading into the furnace: The maximum loading capacity of the heat treatment furnace is 80 tons; the heat treatment furnace is sequentially provided with a heat treatment furnace zone 3, a heat treatment furnace zone 2, and a heat treatment furnace zone 1 from the inside of the furnace chamber to the furnace door position; loading is carried out in the order of decreasing metal temperature; the aluminum alloy coils in alloy state 5052H32 are loaded into heat treatment furnace zone 2, the aluminum alloy coils in alloy state 5052-O are loaded into heat treatment furnace zone 3, and the aluminum alloy coils in alloy state 3003H24 are loaded into heat treatment furnace zone 1; the total loading amount is 75 tons;

[0086] When loading, drill holes at 5 mm from the inner circle of each aluminum alloy coil to place thermocouples to measure the metal temperature; also place baffle plates outside the material racks in heat treatment furnace zone 3 and heat treatment furnace zone 2 respectively, and the installation diagram of the baffle plates is as Figure 1 shown;

[0087] (3)Final annealing process: The final annealing process of the aluminum alloy coils in alloy state 5052H32 is to hold at a metal temperature of 270 °C for 2 hours; the final annealing process of the aluminum alloy coils in alloy state 5052-O is to hold at a metal temperature of 320 °C for 2 hours; the final annealing process of the aluminum alloy coils in alloy state 3003H24 is to hold at a metal temperature of 240 °C for 3 hours;

[0088] (4)Heating up and discharging:

[0089] Heating up 1: Raise the metal temperature to 239 °C and hold for 2.9 hours; during heating up 1, set the furnace gas temperature to the metal temperature + 55 °C, and when the metal temperature rises to the target temperature - 14 °C, change the furnace gas temperature to the target metal temperature;

[0090] Discharging 1: The aluminum alloy coils in alloy state 3003H24 are discharged from the furnace;

[0091] Heating up 2: Raise the metal temperature to 269 °C and hold for 1.9 hours; during heating up 2, set the furnace gas temperature to the metal temperature + 55 °C, and when the metal temperature rises to the target temperature - 14 °C, change the furnace gas temperature to the target metal temperature;

[0092] Discharging 2: The aluminum alloy coils in alloy state 5052H32 are discharged from the furnace;

[0093] Heating 3: The metal temperature rises to 319 °C and is held for 1.9 hours; during Heating 3, the furnace gas temperature is set to the metal temperature + 55 °C. When the metal temperature rises to the target temperature - 14 °C, the furnace gas temperature is changed to the target metal temperature;

[0094] Unloading 3: The aluminum alloy coil in the alloy state 5052 - O is unloaded from the furnace.

[0095] The annealing qualification of the aluminum alloy coils in the alloy states 5052H32, 5052 - O, and 3003H24 in the above Example 4 is shown in Table 4 below:

[0096] Table 4 Annealing qualification of each aluminum alloy coil

[0097]

[0098] Example 5:

[0099] A heat treatment production method for aluminum alloy coils, the method comprising the following steps:

[0100] (1) Taking aluminum alloy coils: Take 25 tons each of aluminum alloy coils in the alloy states 5052H32, 5052 - O, and 3003H24; the weight ratio of the aluminum alloy coils in the alloy states 5052H32, 5052 - O, and 3003H24 is 1:1:1;

[0101] (2) Loading into the furnace: The maximum loading capacity of the heat treatment furnace is 80 tons; the heat treatment furnace is sequentially provided with a heat treatment furnace zone 3, a heat treatment furnace zone 2, and a heat treatment furnace zone 1 from the inside of the furnace chamber to the furnace door position; loading is carried out in the order of decreasing metal temperature; the aluminum alloy coil in the alloy state 5052H32 is loaded into the heat treatment furnace zone 2, the aluminum alloy coil in the alloy state 5052 - O is loaded into the heat treatment furnace zone 3, and the aluminum alloy coil in the alloy state 3003H24 is loaded into the heat treatment furnace zone 1; the total loading amount is 75 tons;

[0102] When loading, a thermocouple is placed in a hole drilled 5 mm from the inner circle of each aluminum alloy coil to measure the metal temperature; partition plates are also placed outside the racks in the heat treatment furnace zone 3 and the heat treatment furnace zone 2 respectively, and the installation diagram of the partition plates is as Figure 1 shown;

[0103] (3) Finished product annealing process: The finished product annealing process for the aluminum alloy coil in the 5052H32 gold state is to keep the metal temperature at 270°C for 2 hours; the finished product annealing process for the aluminum alloy coil in the 5052-O alloy state is to keep the metal temperature at 320°C for 2 hours; the finished product annealing process for the aluminum alloy coil in the 3003H24 alloy state is to keep the metal temperature at 240°C for 3 hours;

[0104] (4) Heating up and discharging:

[0105] Heating up 1: Raise the metal temperature to 239°C and keep it for 2.9 hours; during Heating up 1, set the furnace gas temperature to the metal temperature + 55°C, and when the metal temperature rises to the target temperature - 14°C, change the furnace gas temperature to the target metal temperature;

[0106] Discharging 1: Discharge the aluminum alloy coil in the 3003H24 alloy state;

[0107] Heating up 2: Raise the metal temperature to 269°C and keep it for 1.9 hours; during Heating up 2, set the furnace gas temperature to the metal temperature + 55°C, and when the metal temperature rises to the target temperature - 14°C, change the furnace gas temperature to the target metal temperature;

[0108] Discharging 2: Discharge the aluminum alloy coil in the 5052H32 alloy state;

[0109] Heating up 3: Raise the metal temperature to 319°C and keep it for 1.9 hours; during Heating up 3, set the furnace gas temperature to the metal temperature + 55°C, and when the metal temperature rises to the target temperature - 14°C, change the furnace gas temperature to the target metal temperature;

[0110] Discharging 3: Discharge the aluminum alloy coil in the 5052-O alloy state.

[0111] The annealing qualification status of the aluminum alloy coils in the 5052H32 alloy state, 5052-O alloy state, and 3003H24 alloy state in the above Example 5 is shown in Table 5 below:

[0112] Table 5 Annealing qualification status of each aluminum alloy coil

[0113]

[0114] Example 6:

[0115] A heat treatment production method for aluminum alloy coils, the method comprising the following steps:

[0116] (1)Taking aluminum alloy coils: Take 25 tons each of aluminum alloy coils in alloy state 5052H32, aluminum alloy coils in alloy state 5052-O, and aluminum alloy coils in alloy state 3003H24; the weight ratio of the aluminum alloy coils in alloy state 5052H32, the aluminum alloy coils in alloy state 5052-O, and the aluminum alloy coils in alloy state 3003H24 is 1:1:1;

[0117] (2)Loading into the furnace: The maximum loading capacity of the heat treatment furnace is 80 tons; from the inside of the furnace chamber to the furnace door position, the heat treatment furnace is successively provided with heat treatment furnace zone 3, heat treatment furnace zone 2, and heat treatment furnace zone 1; load the furnace in the order of decreasing metal temperature; the aluminum alloy coils in alloy state 5052H32 are loaded into heat treatment furnace zone 2, the aluminum alloy coils in alloy state 5052-O are loaded into heat treatment furnace zone 3, and the aluminum alloy coils in alloy state 3003H24 are loaded into heat treatment furnace zone 1; the total loading amount is 75 tons;

[0118] When loading into the furnace, punch holes at 5 mm from the inner circle of each aluminum alloy coil to place thermocouples to measure the metal temperature;

[0119] (3)Final annealing process: The final annealing process of the aluminum alloy coils in alloy state 5052H32 is to hold at a metal temperature of 270 °C for 2 hours; the final annealing process of the aluminum alloy coils in alloy state 5052-O is to hold at a metal temperature of 320 °C for 2 hours; the final annealing process of the aluminum alloy coils in alloy state 3003H24 is to hold at a metal temperature of 240 °C for 3 hours;

[0120] (4)Heating up and unloading:

[0121] Heating up 1: Raise the metal temperature to 239 °C and hold for 2.9 hours; during heating up 1, set the furnace gas temperature to the metal temperature + 55 °C, and when the metal temperature rises to the target temperature - 14 °C, change the furnace gas temperature to the target metal temperature;

[0122] [[ID=1's]]Unloading 1: The aluminum alloy coils in alloy state 3003H24 are unloaded from the furnace;

[0123] Heating up 2: Raise the metal temperature to 269 °C and hold for 1.9 hours; during heating up 2, set the furnace gas temperature to the metal temperature + 55 °C, and when the metal temperature rises to the target temperature - 14 °C, change the furnace gas temperature to the target metal temperature;

[0124] Unloading 2: The aluminum alloy coils in alloy state 5052H32 are unloaded from the furnace;

[0125] Heating up 3: Raise the metal temperature to 319 °C and hold for 1.9 hours; during heating up 3, set the furnace gas temperature to the metal temperature + 55 °C, and when the metal temperature rises to the target temperature - 14 °C, change the furnace gas temperature to the target metal temperature;

[0126] Out of the furnace 3: the aluminum alloy coil in the alloy state 5052-O is out of the furnace.

[0127] The annealing qualification of the aluminum alloy coils in the alloy state 5052H32, the aluminum alloy coils in the alloy state 5052-O, and the aluminum alloy coils in the alloy state 3003H24 in the above-mentioned Example 6 is shown in Table 6 below:

[0128] Table 6 Annealing qualification of various aluminum alloy coils

[0129]

[0130] Comparative Example 1:

[0131] A conventional aluminum alloy coil heat treatment production method, the method comprising the following steps:

[0132] (1) Obtain aluminum alloy coils: 25 tons each of aluminum alloy coils in alloy state 5052H32, aluminum alloy coils in alloy state 5052-O, and aluminum alloy coils in alloy state 3003H24; the weight ratio of the aluminum alloy coils in alloy state 5052H32, the aluminum alloy coils in alloy state 5052-O, and the aluminum alloy coils in alloy state 3003H24 is 1:1:1;

[0133] (2) Finished product annealing process: The finished product annealing process of the aluminum alloy coil in the alloy state 5052H32 is to keep the metal temperature at 270°C for 2 hours; the finished product annealing process of the aluminum alloy coil in the alloy state 5052-O is to keep the metal temperature at 320°C for 2 hours; the finished product annealing process of the aluminum alloy coil in the alloy state 3003H24 is to keep the metal temperature at 240°C for 3 hours;

[0134] (3) Furnace loading 1: The maximum loading capacity of the heat treatment furnace is 80 tons; the 5052H32 aluminum alloy coil in the gold state is loaded into zone 2 of the heat treatment furnace;

[0135] (4) Heating and unloading 1:

[0136] The furnace gas temperature is set at 270° C. and maintained for 24 hours, and the aluminum alloy coil in the alloy state of 5052H32 is taken out of the furnace;

[0137] Heating 1: The metal temperature is raised to 242°C and kept at this temperature for 3.2 hours. During heating 1, the furnace gas temperature is set to the metal temperature + 80°C. When the metal temperature rises to the target temperature -15°C, the furnace gas temperature is changed to the target metal temperature.

[0138] (5) Charging furnace 2: The maximum charging capacity of the heat treatment furnace is 80 tons; the aluminum alloy coil in the alloy state 5052-O is charged into zone 2 of the heat treatment furnace;

[0139] (6)Heating up and discharging 2:

[0140] The furnace gas temperature is set at 320 °C for heat preservation for 28 hours, and the aluminum alloy coil in the alloy state of 5052-O is taken out of the furnace;

[0141] (7)Loading the furnace 3: The maximum loading capacity of the heat treatment furnace is 80 tons; the aluminum alloy coil in the alloy state of 3003H24 is loaded into zone 2 of the heat treatment furnace;

[0142] (8)Heating up and discharging 3:

[0143] The furnace gas temperature is set at 240 °C for heat preservation for 20 hours, and the aluminum alloy coil in the alloy state of 3003H24 is taken out of the furnace.

[0144] The annealing qualification of the aluminum alloy coils in the alloy state of 5052H32, 5052-O, and 3003H24 in the above Comparative Example 1 is as shown in Table 7 below:

[0145] Table 7 Annealing qualification of each aluminum alloy coil

[0146]

[0147] Comparative Example 2:

[0148] A conventional production method for heat treatment of aluminum alloy coils, the method comprising the following steps:

[0149] (1)Taking aluminum alloy coils: Take 25 tons each of aluminum alloy coils in the alloy state of 5052H32, 5052-O, and 3003H24; the weight ratio of the aluminum alloy coils in the alloy state of 5052H32, 5052-O, and 3003H24 is 1:1:1;

[0150] (2)Final annealing process: The final annealing process for the aluminum alloy coil in the alloy state of 5052H32 is that the metal temperature is 270 °C for heat preservation for 2 hours; the final annealing process for the aluminum alloy coil in the alloy state of 5052-O is that the metal temperature is 320 °C for heat preservation for 2 hours; the final annealing process for the aluminum alloy coil in the alloy state of 3003H24 is that the metal temperature is 240 °C for heat preservation for 3 hours;

[0151] (3)Loading the furnace 1: The maximum loading capacity of the heat treatment furnace is 80 tons; the aluminum alloy coil in the alloy state of 5052H32 is loaded into zone 2 of the heat treatment furnace, and a thermocouple is placed in a hole drilled at 5 mm from the inner circle of the aluminum alloy coil to measure the metal temperature;

[0152] (4)Heating up and discharging 1:

[0153] The furnace gas temperature is set to the metal temperature + 55°C. When the metal temperature rises to the target temperature - 14°C, the furnace gas temperature is changed to the target metal temperature. When the metal temperature rises to 270°C, it is held for 1.9 hours; the aluminum alloy coil in the alloy state 5052H32 is taken out of the furnace.

[0154] (5)Loading 2: The maximum loading capacity of the heat treatment furnace is 80 tons; the aluminum alloy coil in the alloy state 5052 - O is loaded into zone 2 of the heat treatment furnace, and a thermocouple is placed in a hole drilled 5 mm from the inner circle of the aluminum alloy coil to measure the metal temperature.

[0155] (6)Heating up and unloading 2:

[0156] The furnace gas temperature is set to the metal temperature + 55°C. When the metal temperature rises to the target temperature - 14°C, the furnace gas temperature is changed to the target metal temperature. When the metal temperature rises to 320°C, it is held for 1.9 hours; the aluminum alloy coil in the alloy state 5052 - O is taken out of the furnace.

[0157] (7)Loading 3: The maximum loading capacity of the heat treatment furnace is 80 tons; the aluminum alloy coil in the alloy state 3003H24 is loaded into zone 2 of the heat treatment furnace, and a thermocouple is placed in a hole drilled 5 mm from the inner circle of the aluminum alloy coil to measure the metal temperature.

[0158] (8)Heating up and unloading 3:

[0159] The furnace gas temperature is set to the metal temperature + 55°C. When the metal temperature rises to the target temperature - 14°C, the furnace gas temperature is changed to the target metal temperature. When the metal temperature rises to 240°C, it is held for 1.9 hours; the aluminum alloy coil in the alloy state 3003H24 is taken out of the furnace.

[0160] The annealing qualification situations of the aluminum alloy coils in the alloy state 5052H32, alloy state 5052 - O, and alloy state 3003H24 in the above Comparative Example 2 are shown in Table 8 as follows:

[0161] Table 8 Annealing qualification situations of each aluminum alloy coil

[0162]

[0163] Referring to Comparative Examples 1 - 2, it can be seen that the time consumed for single annealing is very long, the average loading capacity is also small, and the production cost is very high.

[0164] In summary, from the above test results, it can be seen that for a heat treatment production method of aluminum alloy coils according to the present invention, aluminum alloy coils in alloy state 5052H32, aluminum alloy coils in alloy state 5052-O, and aluminum alloy coils in alloy state 3003H24 are used as raw materials, and the heat treatment process of aluminum alloy coils is optimized, so that 3 aluminum alloy coils with different annealing processes can be produced in the same furnace; the production efficiency is high when producing scattered orders, and the production time of 3 aluminum alloy coils with different processes is 22 - 24 hours, which is time-saving and efficient; taking the maximum loading capacity of the heat treatment furnace as 80 tons as an example, the loading capacity can reach 75 tons, and the heat treatment production efficiency is high. Baffles are placed on the outer sides of the racks in Heat Treatment Furnace 3 and Zone 2 of the heat treatment furnace respectively. The purpose of placing the baffles on the outer sides of the racks in Heat Treatment Furnace 3 and Zone 2 of the heat treatment furnace respectively is to make the furnace gas in each zone more stable, enable the grain size of the head and tail of the aluminum alloy coil to be more consistent, and thus make the performance stability of the head and tail of the aluminum alloy coil higher.

[0165] Although the present invention has been described in detail with general descriptions and specific embodiments above, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A heat treatment production method for aluminum alloy coils, characterized in that, The method includes the following steps: (1) Take aluminum alloy coils: Take aluminum alloy coils in alloy state 5052H32, aluminum alloy coils in alloy state 5052-O, and aluminum alloy coils in alloy state 3003H24; (2) Loading into the furnace: The heat treatment furnace is sequentially provided with a heat treatment furnace zone 3, a heat treatment furnace zone 2, and a heat treatment furnace zone 1 from the inside of the furnace chamber to the furnace door position; Load the furnace in the order of decreasing metal temperature; The aluminum alloy coils in alloy state 5052H32 are loaded into heat treatment furnace zone 2, the aluminum alloy coils in alloy state 5052-O are loaded into heat treatment furnace zone 3, and the aluminum alloy coils in alloy state 3003H24 are loaded into heat treatment furnace zone 1, and partition plates are placed outside the racks in heat treatment furnace zone 3 and heat treatment furnace zone 2 respectively to make the furnace gas in each zone more stable. The partition plates are placed along the width direction of the heat treatment furnace. The width of the partition plate is 100 - 200 mm smaller than the width of the furnace chamber. The height of the partition plate is as high as possible without hindering the aluminum alloy coils from being taken out of the furnace; (3) Heating up and discharging: The finished product annealing process for the aluminum alloy coils in alloy state 5052H32 is to keep the metal temperature at 268 - 272 °C for 1.8 - 2.2 hours; The finished product annealing process for the aluminum alloy coils in alloy state 5052-O is to keep the metal temperature at 318 - 322 °C for 1.8 - 2.2 hours; The finished product annealing process for the aluminum alloy coils in alloy state 3003H24 is to keep the metal temperature at 238 - 242 °C for 2.8 - 3.2 hours; The specific heating up and discharging process is as follows: Heating up 1: Raise the temperature of the aluminum alloy coils to the metal temperature of 238 - 242 °C and keep it for 2.8 - 3.2 hours; Discharging 1: Take out the aluminum alloy coils in alloy state 3003H24; Heating up 2: Raise the temperature of the aluminum alloy coils to the metal temperature of 268 - 272 °C and keep it for 1.8 - 2.2 hours; Discharging 2: Take out the aluminum alloy coils in alloy state 5052H32; Heating up 3: Raise the temperature of the aluminum alloy coils to the metal temperature of 318 - 322 °C and keep it for 1.8 - 2.2 hours; Discharging 3: Take out the aluminum alloy coils in alloy state 5052-O.

2. The heat treatment production method of an aluminum alloy coil according to claim 1, wherein, In the step (1), the weight ratio of the aluminum alloy coils in alloy state 5052H32, the aluminum alloy coils in alloy state 5052-O, and the aluminum alloy coils in alloy state 3003H24 is 1:1:

1.

3. A heat treatment production method for aluminum alloy coils according to claim 2, characterized in that, In the step (1), taking 80 tons as the maximum furnace loading capacity of the heat treatment furnace as an example, 25 tons of each of the aluminum alloy coils in alloy state 5052H32, the aluminum alloy coils in alloy state 5052-O, and the aluminum alloy coils in alloy state 3003H24 are taken.

4. A heat treatment production method for an aluminum alloy coil according to claim 1, characterized in that, In the step (3), during heating up 1 - heating up 3, the furnace gas temperature is set to the metal temperature + 40 - + 80 °C. When the temperature of the aluminum alloy coils rises to the metal temperature - 10 - - 15 °C, change the furnace gas temperature to the metal temperature.

5. A heat treatment production method for an aluminum alloy coil according to claim 1, characterized in that, In the step (3), heating up 1: Raise the temperature of the aluminum alloy coils to the metal temperature of 240 - 242 °C and keep it for 2.8 - 3.2 hours.

6. A heat treatment production method for an aluminum alloy coil according to claim 1, characterized in that, In the said step (3), heating up 2: the temperature of the aluminum alloy coil rises to the metal temperature of 270 - 272 °C and is kept warm for 1.8 - 2.2 hours.

7. A heat treatment production method for an aluminum alloy coil according to claim 1, characterized in that In the said step (3), heating up 3: the temperature of the aluminum alloy coil rises to the metal temperature of 320 - 322 °C and is kept warm for 1.8 - 2.2 hours.

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