Double-zero aluminum foil same-furnace continuous mixed loading and annealing process

Abstract

The invention discloses a double-zero aluminum foil same-furnace continuous mixed loading and annealing process which comprises the following steps: carrying out continuous mixed loading and annealing on aluminum foil rolls with the same annealing temperature range and different high-temperature section heat preservation time in a high-temperature section heat preservation state; the aluminum foil coil with the shortest heat preservation time in the furnace is annealed and then discharged out of the furnace, the empty position after discharging is filled and charged into the furnace, annealing and heat preservation are continued, and annealing and heat preservation time compensation is conducted on all the aluminum foil coils in the furnace; and directly discharging after all the aluminum foil coils are annealed and insulated. According to the method, a cooling section of a conventional annealing process is omitted in a high-temperature heat preservation time compensation mode, so that the aluminum foil coils with different heat preservation time can be continuously mixed and annealed in a heat preservation state, the annealing furnace is ensured to be in a full furnace state, and the purposes of greatly improving the charging quantity of the annealing furnace, reducing waste, reducing cost and improving efficiency are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of aluminum foil production, and in particular relates to a same-furnace continuous mixed annealing process for double-zero aluminum foils. Background Art

[0002] Annealing is a process of heating to an appropriate temperature at a certain heating rate, keeping it for a certain time (called the holding period), and cooling it at an appropriate rate.

[0003] The purpose of aluminum foil annealing is to remove residual rolling oil and stress on the surface of aluminum foil and make the aluminum foil reach certain performance. The annealing temperature of double zero aluminum foil reaches above 160℃ to remove oil from the surface and change the performance. Therefore, the time of heating section and cooling section in aluminum foil annealing process is generally short, and the temperature is below 160℃ most of the time, which has little effect on product performance and degreasing results. It is mainly the temperature and time of high temperature insulation section that have a decisive influence on product performance and degreasing.

[0004] The temperature and holding time of the holding section in the aluminum foil annealing process are determined according to product performance requirements, alloy composition, rolling oil composition, foil thickness and width, aluminum foil coil diameter, hot-cast billet, etc. The main parameter is the annealing time, which mainly depends on the width and diameter of the aluminum foil coil. The larger the coil diameter and the wider the foil, the longer the annealing time. However, the alloy composition and rolling oil composition used by each aluminum foil manufacturer are relatively fixed, and the performance requirements of customers are also relatively consistent, so the main factors affecting the annealing process temperature and time are the thickness and width of the foil, as well as the difference between hot-rolled billet and cast billet.

[0005] The temperature and holding time of the holding section in the double zero aluminum foil annealing process are mainly determined according to the product performance requirements, the width of the foil, hot-cast and rolled billets, etc. According to the thickness of the aluminum foil, it is divided into single zero aluminum foil (thickness ≥ 0.01mm) and double zero aluminum foil (thickness 0.004~0.01mm, excluding 0.01mm). For double zero aluminum foil, the wider the width of the aluminum coil, the slower the internal temperature rises, and the more difficult it is for the rolling oil to evaporate and discharge the aluminum coil, so the time is longer; for every 100mm increase in the width of the aluminum foil coil, the annealing and holding time increases by 5~50 hours; for aluminum foil coils of the same width, the annealing and holding time of cast and rolled materials is 10~150 hours longer than that of hot-rolled materials. In view of the above-mentioned influencing factors, aluminum foil manufacturers will formulate conventional annealing processes for each specification of aluminum foil products according to the different billets and product performance requirements. Generally speaking, the conventional annealing process of double zero aluminum foil is: heating to 190-250℃ after 16-30h, keeping it at temperature for 10-400h; then cooling to 100℃ after 10-30h before being taken out of the furnace. When a manufacturer produces a product of a certain specification, all the aluminum foil rolls of that specification are loaded into the annealing furnace and annealed and degreased according to the conventional annealing process.

[0006] However, in actual production, the production order volume of a single specification of aluminum foil products is relatively small, generally between 5 and 20 tons, and the product width specifications are calculated in millimeters. There are many specifications and they are very scattered, which makes it very difficult to organize annealing production. However, the current annealing process cannot achieve continuous annealing of multiple specifications of aluminum foil in the same furnace. The design capacity of the aluminum foil annealing furnace is generally 40 tons / furnace. In order to meet the delivery time of customers, aluminum foil factories will load more than ten tons, or even less than ten tons, and then start annealing. This not only affects the production capacity of the annealing furnace, but also causes great waste and increases production costs.

[0007] Patent document CN117089781A discloses a mixed annealing process of single-zero and double-zero aluminum foils, comprising the following steps: S1, single-zero aluminum foil and double-zero aluminum foil are mixed into a furnace; S2, the heating speed of each section is determined according to the width, thickness, porosity and number of meters of the double-zero aluminum foil roll; S3, the annealing and insulation time is set according to the annealing requirements of the double-zero aluminum foil; S4, the furnace is started for heating and annealing; S5, after the insulation is completed, a cooling time of 3 to 8 hours is set to reduce the furnace temperature to 100 to 120°C; S6, the double-zero products are taken out of the furnace, and the single-zero products are kept in the furnace for further annealing; S7, the temperature is raised to 220 to 260°C, the heating time is set to 1 to 5 hours, and the insulation time is 10 to 100 hours to ensure that the performance of the single-zero products meets the requirements; S8, a cooling time of 3 to 8 hours is set to reduce the furnace temperature to below 100°C before taking them out of the furnace. However, this document is aimed at the situation where single-zero aluminum foil and double-zero aluminum foil are mixed and the furnace temperature is different, but it still cannot guarantee the loading capacity of the annealing furnace, cannot ensure that the annealing furnace is in a full furnace state, and cannot significantly shorten the product delivery time. Summary of the invention

[0008] The purpose of the present invention is to provide a double zero aluminum foil continuous mixed annealing process in the same furnace to solve the above-mentioned problems existing in the prior art, so that aluminum foil coils with the same annealing and insulation temperature range but different insulation times can be continuously mixed and annealed, ensuring that the annealing furnace is in a full furnace state, thereby achieving the purpose of greatly increasing the annealing furnace loading capacity and reducing waste.

[0009] The purpose of the present invention is achieved through the following technical solutions:

[0010] The invention discloses a continuous mixed annealing process for double zero aluminum foil in the same furnace, which is characterized in that aluminum foil rolls with the same annealing temperature range but different heat preservation time in the high temperature section are continuously mixed and annealed in the heat preservation state in the high temperature section; the aluminum foil roll with the shortest heat preservation time in the furnace is annealed first and then taken out of the furnace, and the empty position after being taken out of the furnace is filled and loaded into the furnace, and annealing and heat preservation are continued, and the annealing and heat preservation time of all aluminum foil rolls in the furnace is compensated; the next annealing time is set according to the aluminum foil roll with the shortest remaining heat preservation time; until all aluminum foil rolls are directly taken out of the furnace after annealing and heat preservation are completed;

[0011] The calculation formula of the remaining insulation time is: the remaining insulation time of the original aluminum foil roll in the annealing furnace = annealing insulation process time - executed annealing insulation time + furnace compensation time; the remaining insulation time of the aluminum foil roll loaded in this furnace = annealing insulation process time + heating compensation time;

[0012] For aluminum foil coils newly loaded into the furnace, the annealing and holding process time refers to the time specified by the aluminum foil manufacturer for the high-temperature holding stage in the conventional annealing process when single-furnace annealing is used; for aluminum foil coils already in the furnace, the annealing and holding process time refers to the remaining holding time from the previous loading out of the furnace.

[0013] In the present invention, the furnace loading compensation time refers to the appropriate compensation for the heat loss of the aluminum foil that generates heat loss during the furnace loading operation; the temperature rise compensation time refers to the compensation for the time it takes for the aluminum foil coil newly loaded into the furnace to rise from room temperature to the insulation stage (190-250°C) during the conventional annealing process. Therefore, the furnace loading compensation time and the temperature rise compensation time are for aluminum foil coils loaded into the furnace at different times, and there is no direct correlation between the two.

[0014] More specifically, the double zero aluminum foil continuous mixed annealing process in the same furnace of the present invention comprises the following steps:

[0015] S1. The slit aluminum foil rolls are framed separately according to different annealing process requirements;

[0016] S2, mixing aluminum foil rolls with the same temperature range as the annealing process but different high temperature holding times into the annealing furnace;

[0017] S3, heating up and setting the insulation time of the aluminum foil coil with the shortest insulation time in the annealing process requirements;

[0018] S4, after the insulation time of the aluminum foil roll with the shortest insulation time ends, the aluminum foil roll is taken out of the furnace immediately; a new aluminum foil roll filling furnace is filled in the vacant position after the aluminum foil roll is taken out of the furnace, and high-temperature annealing is continued;

[0019] S5, calculating the remaining insulation time of the aluminum foil rolls in the annealing furnace, performing annealing insulation time compensation on all the aluminum foil rolls in the furnace, and setting the next annealing time according to the aluminum foil roll with the shortest remaining insulation time;

[0020] S6. Repeat steps S4 and S5 until all the aluminum foil coils have been annealed and heat-insulated and are directly taken out of the furnace.

[0021] In step S2, in order to reduce the frequency of loading and unloading and the impact of loading and unloading on the annealing effect, the types of the mixed aluminum foil rolls should be as few as possible.

[0022] Preferably, in step S4, in order to prevent the furnace gas temperature from dropping sharply, the furnace door should be closed after the furnace unloading operation; in order to prevent the material temperature from dropping below 160°C, the total time for unloading and loading should be ≤60min. The shorter the total time for unloading and loading, the smaller the impact on the annealing process.

[0023] Preferably, the furnace loading compensation time refers to the time for compensating the temperature loss caused by the aluminum foil roll during the furnace loading and unloading process; the furnace loading compensation time is:

[0024]

[0025] The aluminum foil annealing process has a safe time range. If annealing is carried out within this time range, the product inspections for oil removal and unfolding are both qualified. If the upper limit of the range is exceeded, unfolding may become difficult and unqualified. If the time is lower than this time range, the oil removal level will be reduced, resulting in unqualified.

[0026] The heating compensation time refers to compensating for the heating time that the aluminum foil roll lacks in the mixed annealing furnace, and has nothing to do with the length of the insulation time in the conventional annealing process of the aluminum foil roll and the production environment temperature. After a large number of experimental verifications of the present invention, the heating compensation time is 29% to 40% of the heating time in the conventional annealing process, preferably 30% to 35% of the heating time in the conventional annealing process; for example, when the heating time in the conventional annealing process is 24h, the heating compensation time is about 7 to 9h; insufficient compensation time will cause unqualified degreasing, and too long compensation time will cause unqualified unfolding of the aluminum foil roll.

[0027] Preferably, in the steps S4 and S6, the aluminum foil coil frame after being taken out of the furnace is placed in a heat preservation cover for natural cooling, and the cooling rate should be ≤6°C / h, preferably ≤4°C / h.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] The method of the present invention saves the cooling section of the conventional annealing process of the double-zero aluminum foil by compensating the high-temperature insulation time, so that the aluminum foil coils with the same insulation temperature range but different insulation times in the high-temperature section of the annealing process can be continuously mixed and annealed in the insulation state, ensuring that the annealing furnace is in a full furnace state, achieving the purpose of greatly increasing the loading capacity of the annealing furnace, reducing waste, reducing costs and increasing efficiency, and realizing the versatility of the current process and the constant temperature annealing process; at the same time, the time for waiting for the furnace to be assembled due to an incomplete furnace is eliminated, and the product delivery period is greatly shortened. DETAILED DESCRIPTION

[0030] The present invention is further described below by means of specific embodiments, which are only used to illustrate the present invention rather than to limit the present invention.

[0031] Example 1 (production environment temperature is about 28°C)

[0032] S1. The slit aluminum foil rolls are framed separately according to different annealing process requirements;

[0033] S2, the aluminum foil rolls of cast-rolled SH901 (width 901-1000mm, conventional annealing process is uniform heating to 230°C within 27h, and the holding time at 230°C is 62h) and cast-rolled SH1301 (width 1301-1400mm, conventional annealing process is uniform heating to 230°C within 27h, and the holding time at 230°C is 130h) with the same annealing temperature range but different holding time in the high temperature section are mixed and put into the annealing furnace;

[0034] S3. According to the annealing process requirements, the cast and rolled SH901 aluminum foil coil with the shortest holding time in the annealing furnace is set to heat up to 230°C at a uniform speed within 27 hours, and the holding time at 230°C is 62 hours;

[0035] S4. After the heat preservation time of the cast and rolled SH901 aluminum foil coil is over, the furnace is taken out immediately; the vacant position after the furnace is taken out is quickly filled and loaded into the furnace, and then new cast and rolled SH901 aluminum foil coils are loaded, and high-temperature annealing is continued after the furnace is filled; the total time for taking out and loading the furnace is 42 minutes;

[0036] Since the unloading and loading operations will cause the annealing furnace to cool down, the temperature of the aluminum foil roll will also drop, so the shorter the total time used for unloading and loading, the smaller the impact on the annealing process, and after the furnace is closed, the temperature must be raised to the insulation temperature before insulation (the other embodiments are the same and will not be repeated);

[0037] The cast and rolled SH901 aluminum foil coil frame after being taken out of the furnace is placed in a heat preservation cover for natural cooling at a cooling rate of 2.3℃ / h; the degreasing result of the cast and rolled SH901 aluminum foil coil is grade A, and the product is qualified after being unfolded to 0.1m;

[0038] S5. Calculate the remaining insulation time of the aluminum foil coil in the annealing furnace, and compensate for the annealing insulation time of all aluminum foil coils in the furnace; the calculation formula for the remaining insulation time is: the remaining insulation time of the original aluminum foil coil in the annealing furnace = annealing insulation process time - annealing insulation time already executed + compensation time for loading out of the furnace; the remaining insulation time of the aluminum foil coil loaded in this furnace = annealing insulation process time + compensation time for the heating stage (the calculation formula is the same below), and the calculation results are shown in Table 1; according to the calculation results, set the cast and rolled SH1301 aluminum foil coil with the shortest remaining insulation time, and heat it to 230°C and continue to heat for 71 hours;

[0039] Table 1

[0040]

[0041] S6. After the heat preservation time of the cast-rolled SH901 and cast-rolled SH1301 aluminum foil coils is completed, the furnace-out operation is immediately carried out. The cast-rolled SH901 and cast-rolled SH1301 aluminum foil coil frames are placed in a heat preservation cover for natural cooling at a cooling rate of 2.2°C / h. The degreasing result of the cast-rolled SH901 aluminum foil coil is Grade A, and the product is qualified when it is unfolded by 0.1m. The degreasing result of the hot-rolled SH1301 aluminum foil coil is Grade A, and the product is qualified when it is unfolded by 0.1m.

[0042] Example 2 (production environment temperature about 35°C)

[0043] S1. The slit aluminum foil rolls are framed separately according to different annealing process requirements;

[0044] S2, the aluminum foil coils of cast-rolled SH601 (width 601-700mm, conventional annealing process is uniform heating to 200°C within 24h, and holding time at 200°C is 61h), cast-rolled SH1001 (width 1001-1100mm, conventional annealing process is uniform heating to 200°C within 24h, and holding time at 200°C is 96h) and cast-rolled SH1601 (width 1601-1700mm, conventional annealing process is uniform heating to 200°C within 24h, and holding time at 200°C is 252h) with the same annealing temperature range but different holding time in the high temperature section are mixed and put into the annealing furnace;

[0045] S3. According to the annealing process requirements, the cast and rolled SH601 aluminum foil coil with the shortest holding time in the annealing furnace is set, and the temperature is slowly raised to 200°C within 24 hours, and the holding time at 200°C is 61 hours;

[0046] S4. After the holding time of the cast and rolled SH601 aluminum foil coil is over, the furnace is taken out immediately; the vacant position after the furnace is taken out is quickly filled and loaded into the furnace, and the cast and rolled SH701 (width 701-800mm, conventional annealing process is to uniformly heat to 200℃ within 24h, and the holding time at 200℃ is 69h) aluminum foil coil is loaded, and high-temperature annealing is continued after the furnace is filled; the total time for taking out and loading the furnace is 44min;

[0047] The cast and rolled SH601 aluminum foil coil frame after being taken out of the furnace is placed in a heat preservation cover for natural cooling at a cooling rate of 2.1℃ / h; the degreasing result of the cast and rolled SH601 aluminum foil coil is grade A, and the product is qualified after being unfolded to 0.1m;

[0048] S5. Calculate the remaining insulation time of the aluminum foil coils in the annealing furnace, and compensate for the annealing insulation time of all aluminum foil coils in the furnace. The calculation results are shown in Table 2. According to the calculation results, set the cast and rolled SH1001 aluminum foil coil with the shortest remaining insulation time, raise the temperature to 200°C and continue to keep warm for 37 hours.

[0049] Table 2

[0050]

[0051] S6. After the heat preservation time of the cast and rolled SH1001 aluminum foil coil is over, the furnace is taken out immediately; the vacant position after the furnace is taken out is quickly filled and loaded with new cast and rolled SH1001 (width 1001-1100mm) aluminum foil coils, and high temperature annealing is continued after the furnace is filled; the total time for taking out and loading the furnace is 36 minutes;

[0052] The cast and rolled SH1001 aluminum foil coil frame after being taken out of the furnace is placed in a heat preservation cover for natural cooling at a cooling rate of 2.5℃ / h. The degreasing result of the cast and rolled SH1001 aluminum foil coil is grade A, and it is unfolded to 0.3m, and the product is qualified;

[0053] S7. Calculate the remaining insulation time of the aluminum foil coils in the annealing furnace, and compensate the annealing insulation time of all aluminum foil coils in the furnace. The calculation results are shown in Table 3. According to the calculation results, set the cast and rolled SH701 aluminum foil coil with the shortest remaining insulation time, raise the temperature to 200°C and continue to keep warm for 41.5 hours;

[0054] Table 3

[0055]

[0056] S8. After the insulation time of cast and rolled SH701 aluminum foil coil is over, the furnace is taken out immediately without adding new material. The total time for taking out and loading is 25 minutes.

[0057] The cast and rolled SH701 aluminum foil coil frame after being taken out of the furnace is placed in a heat preservation cover for natural cooling, with a cooling rate of 2.3℃ / h; the degreasing result of the cast and rolled SH701 aluminum foil coil is grade A, and the product is qualified after being unfolded to 0.1m;

[0058] S9. Calculate the remaining insulation time of the aluminum foil coils in the annealing furnace, and compensate for the annealing insulation time of all aluminum foil coils in the furnace. The calculation results are shown in Table 4. According to the calculation results, set the cast and rolled SH1001 aluminum foil coil with the shortest remaining insulation time, raise the temperature to 200°C and continue to keep warm for 63.5h;

[0059] Table 4

[0060]

[0061] S10, after the insulation time of cast and rolled SH1001 aluminum foil coil was over, the furnace was taken out immediately without adding new material; the total time of furnace taking out and loading was 23 minutes;

[0062] After being taken out of the furnace, the cast and rolled SH1001 aluminum foil coil frame is placed in an insulation cover for natural cooling at a cooling rate of 2.4°C / h; the aluminum foil coil degreasing result is grade A, and when unfolded 0.1m, the product is qualified.

[0063] S11. Calculate the remaining holding time of the aluminum foil coil in the annealing furnace. The calculation results are shown in Table 5. According to the calculation results, set the remaining holding time and raise the temperature to 200° C. and continue to hold for 54.5 hours.

[0064] Table 5

[0065]

[0066] S12, after the insulation time of cast and rolled SH1601 aluminum foil coil was over, it was immediately unloaded without adding new material; the total time of unloading and loading was 31 minutes;

[0067] The cast and rolled SH1601 aluminum foil coil frame after being taken out of the furnace is placed in an insulation cover for natural cooling at a cooling rate of 2.6°C / h; the aluminum foil coil degreasing result is grade A, and when unfolded 0.1m, the product is qualified.

[0068] Example 3 (production environment temperature is about 5°C)

[0069] S1. The slit aluminum foil rolls are framed separately according to different annealing process requirements;

[0070] S2, the aluminum foil rolls of cast-rolled SH1201 (width 1201-1300mm, conventional annealing process is uniformly heating to 210°C within 30h, and the holding time at 210°C is 118h) and cast-rolled SH1501 (width 1501-1600mm, conventional annealing process is uniformly heating to 210°C within 30h, and the holding time at 210°C is 210h) with the same annealing temperature range but different holding time in the high temperature section are mixed and put into the annealing furnace;

[0071] S3. According to the annealing process requirements, the temperature is slowly raised to 210°C within 30 hours. According to the cast and rolled SH1201 aluminum foil coil with the shortest insulation time in the annealing furnace, the insulation time at 210°C is 118 hours;

[0072] S4. After the insulation time of the cast and rolled SH1201 aluminum foil coil is over, the furnace is taken out immediately; the vacant position after the furnace is taken out is quickly filled and loaded into the furnace, and the hot-rolled SH1301 (width 1301-1400mm, conventional annealing process is to uniformly heat to 210℃ within 30h, and the insulation time at 210℃ is 108h) aluminum foil coil is loaded, and high-temperature annealing is continued after the furnace is filled; the total time for taking out and loading the furnace is 52min;

[0073] The cast and rolled SH1201 aluminum foil coil frame after being taken out of the furnace is placed in a heat preservation cover for natural cooling, with a cooling rate of 2.3℃ / h; the degreasing result of the cast and rolled SH1201 aluminum foil coil is grade A, and the product is qualified after being unfolded to 0.1m;

[0074] S5. Calculate the remaining insulation time of the aluminum foil coil in the annealing furnace, and compensate the annealing insulation time of all aluminum foil coils in the furnace. The calculation results are shown in Table 6. According to the calculation results, set the cast and rolled SH1501 aluminum foil coil with the shortest remaining insulation time, raise the temperature to 210°C and continue insulation for 97 hours;

[0075] Table 6

[0076]

[0077] S6, after the insulation time of cast and rolled SH1501 aluminum foil coil was over, it was immediately unloaded without adding new material; the total time of unloading and loading was 41 minutes;

[0078] The cast and rolled SH1501 aluminum foil coil frame after being taken out of the furnace is placed in a heat preservation cover for natural cooling at a cooling rate of 2.4℃ / h; the aluminum foil coil degreasing result is grade A, and the product is qualified when it is unfolded to 0.1m;

[0079] S7. Calculate the remaining holding time of the aluminum foil coil in the annealing furnace. The calculation results are shown in Table 7. According to the calculation results, set the remaining holding time and raise the temperature to 210° C. and continue to hold for 25 hours.

[0080] Table 7

[0081]

[0082] S8. After the hot-rolled SH1301 aluminum foil coil has finished the insulation time, it is taken out of the furnace immediately. After being taken out of the furnace, the aluminum foil coil frame is placed in an insulation cover for natural cooling at a cooling rate of 2.2°C / h. The degreasing result of the aluminum foil coil is grade A, and when it is unfolded to 0.1m, the product is qualified.

[0083] Example 4 (production environment temperature about 10°C)

[0084] S1. The slit aluminum foil rolls are framed separately according to different annealing process requirements;

[0085] S2, the cast-rolled SH401 (width 401-500mm, conventional annealing process is uniformly heating to 200°C within 30h, and the holding time at 200°C is 39h) and cast-rolled SH1001 (width 901-1000mm, conventional annealing process is uniformly heating to 200°C within 30h, and the holding time at 200°C is 106h) aluminum foil coils with the same annealing temperature range but different high temperature section holding time are mixed into the furnace;

[0086] S3. According to the annealing process requirements, the cast and rolled SH401 aluminum foil coil with the shortest holding time in the annealing furnace is set to slowly heat up to 200°C within 30 hours, and the holding time at 200°C is 39 hours;

[0087] S4. After the insulation time of the cast SH401 aluminum foil coil is over, the furnace is taken out immediately, and the furnace door is closed for insulation; the vacant space after the furnace is taken out is quickly filled and loaded into the furnace, and the hot-rolled SH601 (width 601-700mm, conventional annealing process is to uniformly heat to 200℃ within 30h, and the insulation time at 200℃ is 53h) aluminum foil coil is loaded, and high-temperature annealing is continued after the furnace is filled; the total time for taking out and loading the furnace is 35min;

[0088] The cast and rolled SH401 aluminum foil coil frame after being taken out of the furnace is placed in a heat preservation cover for natural cooling, with a cooling rate of 2.6℃ / h; the degreasing result of the cast and rolled SH401 aluminum foil coil is grade A, and the product is qualified after being unfolded to 0.1m;

[0089] S5. Calculate the remaining insulation time of the aluminum foil coils in the annealing furnace, and compensate the annealing insulation time of all aluminum foil coils in the furnace. The calculation results are shown in Table 8. According to the calculation results, the cast and rolled SH901 aluminum foil coil with the shortest remaining insulation time is set to heat up to 200°C and continue to be heated for 63 hours;

[0090] Table 8

[0091]

[0092] S6. After the hot-rolled SH601 aluminum foil coil has finished its insulation time, it is immediately taken out of the furnace without adding new material. The hot-rolled SH601 aluminum foil coil frame is placed in an insulation cover for natural cooling at a cooling rate of 2.3°C / h. The degreasing result of the cast-rolled SH901 aluminum foil coil is Grade A, and the product is qualified after being unfolded by 0.1m. The degreasing result of the aluminum foil coil is Grade A, and the product is qualified after being unfolded by 0.1m.

[0093] S7. Calculate the remaining holding time of the aluminum foil coil in the annealing furnace. The calculation results are shown in Table 9. According to the calculation results, set the remaining holding time and raise the temperature to 200° C. and continue to hold for 43 hours.

[0094] Table 9

[0095]

[0096] S8. After the hot-rolled cast SH1001 aluminum foil coil has finished the insulation time, it is taken out of the furnace immediately. After being taken out of the furnace, the aluminum foil coil frame is placed in an insulation cover for natural cooling at a cooling rate of 2.6°C / h. The degreasing result of the aluminum foil coil is grade A, and when it is unfolded to 0.1m, the product is qualified.

[0097] Comparative Example 1 (production environment temperature is about 10°C)

[0098] Comparative Example 1 is a comparative example of Example 4, except that in S5, the remaining holding time of the aluminum foil coils in the annealing furnace is calculated, and the annealing holding time of all the aluminum foil coils in the furnace is compensated, and the calculation results are shown in Table 10; according to the calculation results, the cast SH1001 aluminum foil coil with the shortest remaining holding time is set, and the temperature is raised to 200°C and the holding time is continued for 53 hours;

[0099] Table 10

[0100]

[0101] S6, after the heat preservation time of the cast-rolled SH1001 and hot-rolled SH601 aluminum foil coils is completed, the furnace-out operation is immediately carried out, and the cast-rolled SH901 and hot-rolled SH601 aluminum foil coil frames are placed in a heat preservation cover for natural cooling at a cooling rate of 2.4°C / h;

[0102] The degreasing result of the cast and rolled SH901 aluminum foil coil is 70% A grade in profile, and 0.1m is unfolded, which is unqualified. It is necessary to compensate the heat loss caused by unloading and loading.

[0103] The degreasing result of the hot-rolled SH601 aluminum foil coil is grade A, and it is unqualified when it is unfolded to 0.4m. The compensation time for heating to 200℃ in the annealing process for 30h is too long, resulting in adhesion.

[0104] Comparative Example 2 (production environment temperature about 10°C)

[0105] Comparative Example 2 is a comparative example of Example 4.

[0106] S1. The slit aluminum foil rolls are framed separately according to different annealing process requirements;

[0107] S2, mixing cast-rolled SH401 (width 401-500mm) and cast-rolled SH1001 (width 1001-1100mm) aluminum foil coils with the same annealing temperature range but different high temperature holding time into the furnace;

[0108] S3. According to the annealing process requirements, the cast and rolled SH401 aluminum foil coil with the shortest holding time in the annealing furnace is set to slowly heat up to 200°C within 30 hours, and the holding time at 200°C is 39 hours;

[0109] S4. After the insulation time of the cast and rolled SH401 aluminum foil coil is over, the furnace is taken out immediately and the furnace door is closed for insulation; the vacant space after the furnace is taken out is quickly filled and loaded with cast and rolled SH601 (width 601-700mm, conventional annealing process is to uniformly heat to 200℃ within 30h, and the insulation time at 200℃ is 61h) aluminum foil coil, and high temperature annealing is continued after the furnace is filled; the total time for taking out and loading the furnace is 38min;

[0110] The cast and rolled SH401 aluminum foil coil frame after being taken out of the furnace is placed in a heat preservation cover for natural cooling at a cooling rate of 2.7℃ / h; the degreasing result of the cast and rolled SH401 aluminum foil coil is grade A, and the product is qualified after being unfolded to 0.1m;

[0111] S5. Calculate the remaining insulation time of the aluminum foil coils in the annealing furnace, and compensate for the annealing insulation time of all aluminum foil coils in the furnace. The calculation results are shown in Table 11. According to the calculation results, set the cast and rolled SH1001 aluminum foil coil with the shortest remaining insulation time, raise the temperature to 200°C and continue to keep warm for 72 hours.

[0112] Table 11

[0113]

[0114] S6, after the heat preservation time of the cast-rolled SH1001 and cast-rolled SH601 aluminum foil coils is completed, the furnace-out operation is immediately carried out, and the cast-rolled SH1001 and cast-rolled SH601 aluminum foil coil frames after being taken out of the furnace are placed in a heat preservation cover for natural cooling, and the cooling rate is 2.3°C / h;

[0115] The degreasing result of the cast and rolled SH1001 aluminum foil coil is grade A, and the unfolding is 0.4m, which is unqualified. The time for compensating the heat loss caused by taking out of the furnace and loading into the furnace is too long, resulting in unqualified unfolding.

[0116] The degreasing result of the cast and rolled SH601 aluminum foil coil is 60% grade A, and it is unqualified when unfolded to 0.1m. The compensation time for the annealing process from 30h to 200℃ is 6h, which is not enough to cause the degreasing failure.

[0117] Comparative Example 3 (production environment temperature about 32°C)

[0118] S1. The slit aluminum foil rolls are framed separately according to different annealing process requirements;

[0119] S2, mixing aluminum foil coils of cast-rolled SH601 (width 601-700 mm) and cast-rolled SH1101 (width 1101-1200 mm, conventional annealing process is uniform heating to 200° C. within 24 hours, and holding time at 200° C. for 120 hours) with the same annealing temperature range but different holding time in the high temperature section into the furnace;

[0120] S3. According to the annealing process requirements, the temperature is slowly raised to 200°C within 24 hours. The holding time at 200°C is 61 hours according to the cast and rolled SH601 aluminum foil coil with the shortest holding time in the annealing furnace.

[0121] S4. After the insulation time of the cast-rolled SH601 aluminum foil coil is over, the furnace is taken out immediately, and the furnace door is closed for insulation; the vacant space after the furnace is taken out is quickly filled and loaded into the furnace, and the hot-rolled SH701 (width 701-800mm, conventional annealing process is to uniformly heat to 200℃ within 24h, and the insulation time at 200℃ is 54h) aluminum foil coil is loaded, and high-temperature annealing is continued after the furnace is filled; the total time for taking out and loading the furnace is 76min;

[0122] The cast and rolled SH601 aluminum foil coil frame after being taken out of the furnace is placed in a heat preservation cover for natural cooling, with a cooling rate of 2.3℃ / h; the degreasing result of the cast and rolled SH601 aluminum foil coil is grade A, and the product is qualified after being unfolded to 0.1m;

[0123] S5. Calculate the remaining holding time of the aluminum foil coils in the annealing furnace, and compensate for the annealing holding time of all aluminum foil coils in the furnace. The calculation results are shown in Table 12. According to the calculation results, set the cast and rolled SH1101 aluminum foil coil with the shortest remaining holding time, raise the temperature to 200°C and continue to hold for 62 hours.

[0124] Table 12

[0125]

[0126] S6, after the heat preservation time of the cast-rolled SH1101 and hot-rolled SH701 aluminum foil coils is completed, the furnace-out operation is immediately carried out, and the cast-rolled SH1101 and hot-rolled SH701 aluminum foil coil frames after being taken out of the furnace are placed in a heat preservation cover for natural cooling, and the cooling rate is 2.2°C / h;

[0127] The degreasing result of cast and rolled SH1101 aluminum foil coil is 65% grade A, and the unrolling is 0.1m, which is unqualified. The time of unloading and loading is too long, and the compensation time of heat loss is insufficient, resulting in unqualified unrolling.

[0128] The degreasing result of hot-rolled SH701 aluminum foil coil is grade A, unrolled 0.1m, qualified.

[0129] It can be seen from Examples 1-4 and Comparative Examples 1-3 that the method of the present invention eliminates the cooling stage of the conventional annealing process, so that aluminum foil coils with the same annealing high-temperature insulation temperature range but different insulation times can be continuously mixed annealed under the insulation state. By compensating for the high-temperature insulation time, the versatility of the current process and the constant temperature annealing process is achieved, ensuring that the annealing furnace is in a full furnace state, thereby achieving the purpose of greatly increasing the annealing furnace loading capacity, reducing waste, reducing costs and increasing efficiency; at the same time, the time required to wait for the furnace to be assembled due to an unfull furnace is eliminated, thereby greatly shortening the product delivery period.

Claims

1. A double zero aluminum foil continuous mixed annealing process in the same furnace, characterized in that: Aluminum foil coils with the same annealing temperature range but different high-temperature holding time are continuously mixed and annealed under the high-temperature holding state; the aluminum foil coil with the shortest holding time in the furnace is annealed first and then taken out of the furnace, and the vacant position after being taken out of the furnace is filled and loaded into the furnace, and annealing and holding are continued, and the annealing and holding time of all aluminum foil coils in the furnace is compensated; the next annealing time is set according to the aluminum foil coil with the shortest remaining holding time; until all aluminum foil coils are directly taken out of the furnace after annealing and holding; The calculation formula for the remaining insulation time is: the remaining insulation time of the original aluminum foil roll in the annealing furnace = annealing insulation process time - executed annealing insulation time + furnace loading compensation time; the remaining insulation time of the aluminum foil roll loaded this time = annealing insulation process time + heating stage compensation time.

2. The double zero aluminum foil continuous mixed annealing process in the same furnace according to claim 1 is characterized in that: The following steps are involved: S1. The slit aluminum foil rolls are framed separately according to different annealing process requirements; S2, mixing aluminum foil rolls with the same temperature range as the annealing process but different high temperature holding times into the annealing furnace; S3, heating up and setting the insulation time of the aluminum foil coil with the shortest insulation time in the annealing process requirements; S4, after the insulation time of the aluminum foil roll with the shortest insulation time ends, the aluminum foil roll is immediately taken out of the oven; Fill the empty space after the furnace with a new aluminum foil coiling furnace and continue high-temperature annealing; S5, calculating the remaining insulation time of the aluminum foil rolls in the annealing furnace, performing annealing insulation time compensation on all the aluminum foil rolls in the furnace, and setting the next annealing time according to the aluminum foil roll with the shortest remaining insulation time; S6. Repeat steps S4 and S5 until all the aluminum foil coils have been annealed and heat-insulated and are directly taken out of the furnace.

3. The double zero aluminum foil continuous mixed annealing process in the same furnace according to claim 2 is characterized in that: In step S4, the total time for unloading and loading the furnace should be ≤ 60 min.

4. The double zero aluminum foil continuous mixed annealing process in the same furnace according to claim 2 is characterized in that: The compensation time of the loading furnace is: The compensation time of the heating section is 29% to 40% of the heating section time in the conventional annealing process.

5. The double zero aluminum foil continuous mixed annealing process in the same furnace according to claim 4 is characterized in that: The compensation time of the heating section is 30% to 35% of the heating section time in the conventional annealing process.

6. The double zero aluminum foil continuous mixed annealing process in the same furnace according to claim 2 is characterized in that: In the steps S4 and S6, the aluminum foil coil frame after being taken out of the furnace is placed in a heat preservation cover for natural cooling, and the cooling rate should be ≤6°C / h.

7. The double zero aluminum foil continuous mixed annealing process in the same furnace according to claim 2 is characterized in that: In the steps S4 and S6, the aluminum foil coil frame after being taken out of the furnace is placed in a heat preservation cover for natural cooling, and the cooling rate is ≤4°C / h.

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