CN115488151A - Method for producing sealing aluminum foils with different finished product thicknesses in same secondary process - Google Patents

Method for producing sealing aluminum foils with different finished product thicknesses in same secondary process Download PDF

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CN115488151A
CN115488151A CN202211253275.7A CN202211253275A CN115488151A CN 115488151 A CN115488151 A CN 115488151A CN 202211253275 A CN202211253275 A CN 202211253275A CN 115488151 A CN115488151 A CN 115488151A
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rolling
aluminum foil
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outlet
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陈志明
李俊
刘文中
周晓群
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Jiangsu Daya Aluminum Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/40—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling foils which present special problems, e.g. because of thinness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0007—Cutting or shearing the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58—Roll-force control; Roll-gap control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0239—Lubricating
    • B21B45/0242—Lubricants
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0007—Cutting or shearing the product
    • B21B2015/0021—Cutting or shearing the product in the rolling direction

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Abstract

The invention belongs to the technical field of nonferrous metal processing, and relates to a method for producing sealing cover aluminum foils with different finished product thicknesses in the same secondary process, which comprises the following steps: an aluminum alloy 8011 with the thickness of 0.24mm is used for casting and rolling a blank, the state is H16, and the tensile strength is more than or equal to 170MPa; rough rolling for one pass, finish rolling for doubling after middle rolling for one pass, and finish rolling for one pass on the doubled aluminum foil; cutting the aluminum foil by a circular cutter, and annealing. The invention utilizes the same rolling pass, changes different rolling reduction of each pass, is matched with rolling oil with high strength and high lubricating property, and adopts adaptive rolling process parameters to produce the capping aluminum foil with high strength and different thicknesses. After being cut into the specifications required by customers, the food is subjected to different annealing processes according to the use condition of the sealed food of the users, thereby meeting various requirements of the users.

Description

Method for producing sealing aluminum foils with different finished product thicknesses in same secondary process
Technical Field
The invention belongs to the technical field of nonferrous metal processing, relates to an aluminum foil, and particularly relates to a method for producing a cover aluminum foil with different finished product thicknesses in the same process.
Background
The aluminum foil has good oxygen resistance and light shielding properties, and is widely applied to packaging of foods, medicines and the like to prolong the storage quality and guarantee period of the products. The milk package adopts aseptic package, and also widely uses plastic bottle aluminum foil sealing mode, firstly, is convenient for opening and eating, secondly, the package material can be recycled, and accords with the current concept of 'recycling economy, environmental protection life'.
At present, the milk package is gradually popular at home and abroad by adopting a packaging mode of plastic bottles and aluminum foil sealing, the yield is increased by more than 10% per year, and the amount of aluminum foil required by the domestic market is about 10000 tons every year.
In order to prevent the aluminum foil of the bottle cap from being damaged, which causes milk to overflow or cause deterioration, the aluminum foil used as the bottle cap is required to have a considerable strength, and the thickness of the aluminum foil generally adopted in the industry at present is 0.05mm. With the development of aluminum foil processing technology and the concept of cost saving and consumption reduction of food packaging enterprises, according to different foods, beverages or other fluid substances, the thickness of the aluminum foil generally develops towards the direction of thinness, and the market has met the demand that customers adopt 0.04mm, 0.03mm or even 0.02mm bottle cap foils.
Because the sealing aluminum foil is required to have high performance and high peel strength, the thickness is gradually reduced from 0.05mm to 0.04mm, 0.03mm or even 0.02mm, the sealing aluminum foil products with different thicknesses are determined to be produced on the premise of not increasing production pass and not influencing the production efficiency, the research is carried out from blanks, rolling processes, slitting processes to annealing processes and the like, the original production process cannot meet the requirements, the comprehensive research needs to be carried out from the blanks, rolling oil, additives, roll parameters, rolling parameters, slitting modes and the annealing processes, and a set of complete scientific and reasonable production process is concluded through exploration, so that the aluminum foil products with different thicknesses can be stably produced, the production efficiency is improved, and the requirements of standards and markets are met. In order to meet the market demand, a production process of the sealing aluminum foil with different thicknesses is required to be developed in the same production process.
Disclosure of Invention
In view of the above-mentioned deficiencies in the prior art, the present invention discloses a method for producing aluminum foils with different thicknesses in the same process.
A method for producing sealing aluminum foils with different finished product thicknesses in the same process comprises the following steps:
A. preparing materials, namely casting and rolling a blank by using an aluminum alloy 8011 with the thickness of 0.24mm, wherein the state is H16, and the tensile strength is more than or equal to 170MPa;
B. rough rolling for one pass, fine rolling for double combination after middle rolling for one pass, and fine rolling for one pass of the double combined aluminum foil, wherein,
the final product is 0.05mm thick: the rough rolling inlet is 0.24mm, and the outlet is 0.14mm; the middle rolling inlet is 0.14mm, and the outlet is 0.075mm; the inlet of the finish rolling is 0.075mm, the outlet is 0.05mm, and the uncoiling tension is 38-45N/mm 2 ；
Alternatively, the final product is 0.04mm thick: the rough rolling inlet is 0.24mm, and the outlet is 0.13mm; the middle rolling inlet is 0.13mm, and the outlet is 0.065mm; the inlet of the finish rolling is 0.065mm, the outlet is 0.04mm, and the uncoiling tension is 38-50N/mm 2 ；
Alternatively, the final product is 0.03mm thick: the rough rolling inlet is 0.24mm, and the outlet is 0.12mm; the middle rolling inlet is 0.12mm, and the outlet is 0.06mm; the inlet of the finish rolling is 0.06mm, the outlet is 0.03mm, and the uncoiling tension is 38-50N/mm 2 ；
The rolling process parameters are as follows: the uncoiling tension in rough rolling is 30-40N/mm 2 The crimp tension is 35-45N/mm 2 The rolling speed is 500 +/-100 m/min, and the rolling oil temperature is 38-45 ℃; uncoiling tension in medium rolling is 35-45N/mm 2 The crimp tension is 45-50N/mm 2 The rolling speed is 450 +/-100 m/min, and the rolling oil temperature is 40-50 ℃; the coiling tension is 40-50N/mm during finish rolling 2 The rolling speed is 350 +/-100 m/min, and the rolling oil temperature is 40-55 ℃; the rolling force of three passes is 180 +/-50 t, and the plate profile curve is-32;
C. cutting an aluminum foil by a circular cutter;
D. annealing the cut aluminum foil, wherein,
the tensile strength of the final product is 95-110 MPa, and the peel strength is more than 8.5N:
the annealing parameters of the aluminum coil with the width specification of 400-500 mm are as follows: rapidly heating from room temperature to 320 ℃, rapidly heating (without the requirement of heating rate), preserving heat for 35h, naturally cooling to 120 ℃ along with the furnace, discharging from the furnace, and naturally cooling to room temperature;
the annealing parameters of the aluminum coil with the width specification of 500-600 mm are as follows: rapidly heating from room temperature to 320 ℃, rapidly heating (without the requirement of heating rate), preserving heat for 40h, naturally cooling to 120 ℃ along with the furnace, discharging from the furnace, and naturally cooling to room temperature;
the tensile strength of the final product is 70-90 MPa, and the peel strength is more than 8.5N:
the annealing parameters of the aluminum coil with the width specification of 400-500 mm are as follows: rapidly heating from room temperature to 350 ℃, rapidly heating (without the requirement of heating rate), preserving heat for 30h, naturally cooling to 120 ℃ along with the furnace, discharging from the furnace, and naturally cooling to room temperature;
the annealing parameters of the aluminum coil with the width specification of 500-600 mm are as follows: rapidly heating from room temperature to 350 ℃, rapidly heating (without heating rate requirement), keeping the temperature for 35h, naturally cooling to 120 ℃ along with the furnace, discharging from the furnace, and naturally cooling to room temperature.
The cover foils with the three thicknesses adopt the same three-pass method of one-pass rough rolling, one-pass intermediate rolling and one-pass finish rolling.
In a preferred embodiment of the invention, when rough rolling and medium rolling are carried out in the step B, 8011 cast rolling blank H16 is adopted, the strength of the alloy is high, and particularly when a 0.03mm cover foil product is produced, the rolling oil is required to have high strength and lubricity because the rolling oil has high rolling reduction, so that the rough rolling and the medium rolling adopt No. 90 rolling oil as base oil, and the additive adopts two additives, namely alcohol and ester additives with high strength and high lubricity, and the total content reaches 8-10%.
In the better disclosure of the invention, in the finish rolling in the step B, because the cleanliness of the product after annealing is considered, the No. 82 rolling oil is used as the base oil, the additives are still two additives of alcohols and esters with high strength and high lubricating property, the total content is controlled between 6% and 8%, and the basic rolling requirement is met.
In the preferred embodiment of the invention, the convexity of the supporting roller for two passes of rough and medium rolling in the step B is set to be 20 per mill; a working roll: the convexity of the rough roller is 30 per mill, and the convexity of the medium roller is 30 per mill; the convexity of the finishing roll is defined as: 20 per mill of supporting roll and 40 per mill of working roll.
In the preferred embodiment of the invention, in the step B, the roughness Ra of the rough rolling working roll is 0.23 μm, the roughness Ra of the medium rolling working roll is 0.15 μm, and the roughness of the finish rolling working roll is 0.08 μm; the roughness of the back-up rolls for the rough/medium/finish rolling was Ra0.43. Mu.m.
The first step is as follows: study of the billet determines the alloy, state and type of the billet
In order to prevent the aluminum foil of the bottle cap from being damaged, which causes the overflow or the deterioration of milk, the aluminum foil used for the bottle cap is required to have certain strength, and the 8011 alloy with high strength is selected; the thickness of the finished product is considered to be diversified, the number of passes is not increased, the thickness of the bottle cap aluminum foil blank with different thicknesses at the production position can be produced only by changing the reduction of the number of the passes, and the thickness is determined to be 0.24mm; because the product needs higher rupture strength, the blank needs to have certain strength, the state of the blank is selected to be H16, and the tensile strength of the blank is required to be more than or equal to 170MPa; the cast-rolled billet is selected in consideration that the strength hardening of the cast-rolled billet is larger than that of the hot-rolled billet, and the final product does not require elongation. According to the research, a cast-rolled blank with the thickness of 0.24mm, the alloy 8011, the state H16 and the tensile strength of more than or equal to 170MPa is adopted.
The second step: distribution of rolling passes
Because the thickness of the product is various, the production process is as universal as possible, and the production efficiency is improved. The distribution of the pass reduction is as follows:
pass distribution of 0.05mm thickness:
Figure BDA0003888647590000031
pass distribution for 0.04mm thickness:
Figure BDA0003888647590000032
pass distribution of 0.03mm thickness:
Figure BDA0003888647590000033
the third step: preparation of rolling oil
1. The rough and medium rolling mill adopts No. 90 rolling oil because the deformation of metal is relatively small and the rolling speed is general. The additive is used as the core part of rolling oil, not only has higher oil film strength combined with the rolling oil, but also has higher lubricity, and also considers the cleanliness of the surface of an annealed aluminum foil, two types of high-strength alcohol additives (hydroxyl value is marked) and ester additives (saponification value is marked) with better lubricity are adopted, and the rolling oil preparation table of a rough and medium rolling mill is as follows:
item Viscosity of the oil Flash point Distillation range Hydroxyl number Saponification number
Unit of (40℃)mm 2 /s ℃ ℃ mgKOH/g MgKOH/g
Numerical value 2.1～2.4 90～95 205～260 6～10 10～16
Content% - - - 3～4 5～6
2. Finishing mill: the product is mainly considered to be annealed in the finish rolling stage, and No. 82 rolling oil and low-content additives are adopted. The additive type is the same as that of the rough and medium rolling mill, and the high-strength alcohol additive (hydroxyl value is indicated) and the high-lubricity ester additive (saponification value is indicated) are adopted, and the rolling oil is prepared according to the following table:
item Viscosity of the oil Flash point Distillation range Hydroxyl number Saponification number
Unit (40℃)mm 2 /s ℃ ℃ mgKOH/g MgKOH/g
Numerical value 1.8～2.2 80～85 205～255 4～8 6～10
Content% - - - 2～3 4～5
The fourth step: study and determination of roll parameters: the roll parameters relate to roll crown and roll roughness.
The convexity directly influences the flatness of the plate shape of the aluminum foil, and can be determined only by calculating and testing by integrating various factors such as the diameter, the width, the rolling reduction, the rolling parameters and the like of the roller. Calculating and testing, and setting the convexity of the supporting roller for two passes of rough and medium rolling to be 20 per mill; a working roll: rough rolling with 30 per mill of convexity, and positioning the convexity of the middle rolling roller with 30 per mill; and setting the convexity of the finishing roller as follows: supporting roll 20 per mill and working roll 40 per mill.
The roll roughness is determined by closely related rolling speed, lubricating oil index, aluminum foil surface quality requirement and pinhole requirement, and the rough supporting roll, the middle supporting roll and the fine supporting roll are all Ra0.43 mu m for unified management and convenient management.
Rough rolling, medium rolling and finish rolling of the back-up roll have the roughness Ra of 0.43 mu m; convexity: 20 per mill of the total weight of the raw materials,
the roughness Ra of the rough rolling working roll is 0.23 mu m, and the convexity is as follows: 30 per mill of the total weight of the mixture,
the roughness Ra of the middle rolling working roll is 0.15 mu m, and the convexity is as follows: 30 per mill of the total weight of the mixture,
the roughness of the finish rolling working roll is 0.08 mu m, and the convexity is as follows: 40 per mill of the total weight of the mixture,
the fifth step: determination of rolling process parameters
The rolling technological parameters are parameters which can be adjusted according to the field rolling condition after the main parameter indexes are determined, can be determined only after the thickness and the plate shape meet the requirements, and can be adjusted at any time according to the conditions in the rolling process, wherein the parameters comprise load, speed, uncoiling/coiling tension, rolling force, oil temperature, plate shape curve and the like, and the corresponding reasonable technological parameters are determined through multiple tests and record statistics, and are shown in the following table.
0.05mm rolling process table
Figure BDA0003888647590000051
0.04mm rolling process table
Figure BDA0003888647590000052
0.03 rolling process table
Figure BDA0003888647590000053
And a sixth step: determination of the slitting mode
Because the thickness of the product is thicker, the cutting depth is much larger than that of a double-zero aluminum foil, and if the blade is used for cutting and is heated by friction, the blade is easy to passivate to cause edge warping, burrs and the like of the aluminum foil. Meanwhile, the tension and the pressure of the cut thick materials are large, the cut rubber rollers are greatly damaged, and particularly the cut flattening rollers are greatly damaged. Therefore, the cutting disc is adopted for cutting, and the cutting disc rotates along with the material, so that the heating and passivation caused by friction of the cutting edge are avoided. In order to avoid damage of thick materials to the rubber roller, the slitting flattening rollers all adopt steel rollers, and simultaneously, edge warping caused by deformation of the edge of the knife edge slitting aluminum foil is eliminated.
Because the thickness of the product is thicker, in order to prevent the blockage of the fan caused by the difficulty in edge breaking, the high-power fan with the edge breaking knife is configured, and the smooth production of slitting is ensured.
The seventh step: determination of annealing Process
The cast-rolled blank with the thickness of 0.24mm, alloy 8011, state H16 and tensile strength of more than or equal to 170MPa is rolled into the thickness of 0.05mm, 0.04mm and 0.03mm through three passes of rough rolling, medium rolling and finish rolling, and the tensile strength of the product reaches about 250 MPa.
1. The annealing process is formulated according to the product use condition of a user, some sealing products are used for sterilizing food at a high temperature of 90 ℃ for 30min, the bottle cap foil requires extremely high tensile strength (95 MPa-110 MPa) and high peel strength (more than 8.5N), and the following annealing process is formulated.
1. Width specification 400mm-500mm art table
Process section Temperature rise Heat preservation Temperature reduction Discharging from the furnace
Temperature (. Degree.C.) The room temperature rises to 320 deg.C 320 320 to 120 Discharging and naturally cooling to room temperature
Time (h) - 35 - -
Heating and cooling method Rapid temperature rise - Naturally cooling with the furnace Natural cooling
The annealing process profile is shown in figure 1.
The detection result of the product is as follows: tensile strength 102MPa, water brushing test A + And the composite peel strength of the user is 9.2N, which is larger than the common 7N.
2. Width specification 500mm-600mm art table
Process stage Temperature rise Heat preservation Temperature reduction Discharging from the furnace
Temperature (. Degree.C.) The room temperature rises to 320 DEG 320 320 to 120 Discharging and naturally cooling to room temperature
Time (h) - 40 - -
Heating and cooling method Rapid temperature rise --- Naturally cooling with the furnace Natural cooling
The annealing process profile is shown in figure 2.
And (3) detecting a product: tensile strength: 98MPa; brushing test A + (ii) a The composite peel strength of the user is 9.3N, which is larger than the common 7N.
After the products of the two processes are sent to users, the bottle-bursting rate of the product sealing cover is reduced to three parts per thousand from five per thousand, and the rejection rate is reduced by more than 10 times.
2. Some sealing products only need to be sealed and stored without high-temperature sterilization treatment, the strength requirement of the sealing foil is in a proper range (generally 70 MPa-90 MPa), the peel strength can meet the general requirement (generally more than 7N), and the following annealing process is formulated.
1. Width specification 400mm-500mm art table
Process stage Temperature rise Heat preservation Temperature reduction Discharging from the furnace
Temperature (. Degree.C.) Room temperature up to 350 deg.C 350 350 to 120 Discharging and naturally cooling to room temperature
Time (h) --- 30 --- ---
Temperature raising and lowering mode Rapid temperature rise --- Naturally cooling with the furnace Natural cooling
The annealing process is graphically shown in fig. 3.
And (3) detecting a product: tensile strength: 83MPa; peel strength: 9.2N; the product meets the requirements of users through the use of customers.
2. Width specification 500mm-600mm art table
Process stage Temperature rise Heat preservation Temperature reduction Discharging from the furnace
Temperature (. Degree.C.) Room temperature up to 350 deg.C 350 350 to 120 Naturally cooling to room temperature after discharging
Time (h) --- 35 --- ---
Heating and cooling method Rapid temperature rise --- Naturally cooling with the furnace Natural cooling
The annealing process is graphically shown in fig. 4.
And (3) detecting a product: tensile strength: 85MPa; peeling strength: 9.1N; the product meets the requirements after being used by users.
Advantageous effects
The invention utilizes the same rolling pass, changes different rolling reduction of each pass, is matched with rolling oil with high strength and high lubricating property, and adopts adaptive rolling process parameters to produce the cover aluminum foil with high strength and different thicknesses. After being cut into the specifications required by customers, the food is subjected to different annealing processes according to the use condition of the capped food, thereby meeting various requirements of the users.
Drawings
FIG. 1 is a graph of an annealing process with a width of 400-500 mm;
FIG. 2 is a graph of an annealing process with a width of 500-600 mm;
FIG. 3 is a graph of an annealing process with a width of 400-500 mm;
FIG. 4 shows the annealing process curve with the width specification of 400-500 mm.
Detailed Description
The present invention will be described in detail below with reference to examples to enable those skilled in the art to better understand the present invention, but the present invention is not limited to the following examples.
Example 1
30t of milk cover aluminum foil with the specification of 0.05mm multiplied by 450mm is produced, and the sterilization treatment at the high temperature of 90 ℃ multiplied by 30Min is required, which comprises the following steps:
1. the blank is cast-rolled 8011-H16, thickness 0.3mm, width 960mm, tensile strength 180Mpa,
2. rough and medium rolling oil: viscosity 2.18mm 2 A/s, a flash point of 92 ℃, a flow path of 205-260 ℃, a hydroxyl value of 8.5mgKOH/g, a saponification value of 14.8MgKOH/g,
finish rolling oil: viscosity 2.06mm 2 A/s, a flash point of 82 ℃, a flow path of 205-255 ℃, a hydroxyl value of 7.12mgKOH/g, a saponification value of 9.2mgKOH/g,
3. adopting a working roll with rough rolling roughness of 0.23 μm, rolling force of 200 tons, speed of 410m/min and inlet tension of 36N/mm 2 The outlet tension is 40N/mm 2 A billet of 8011-H16 thickness of 0.24mm was rolled to an intermediate outlet thickness of 0.14The product is a mixture of a sodium sulfate solution,
4. replacing the working roll, adopting a medium roll with the roughness of 0.15 μm, the rolling force of 200 tons, the speed of 480m/min and the inlet tension of 40N/mm 2 Outlet tension of 48N/mm 2 Rolling the steel plate into a medium rolling product with the thickness of 0.075mm,
5. the product with the thickness of 0.075mm is doubled and trimmed by a doubling machine to be 0.075mm multiplied by 2mm multiplied by 940mm wide,
6. using a finish rolling work roll having a roughness of 0.08 μm, a rolling force of 220 tons and an entry tension of 42N/mm 2 The outlet tension is 45N/mm 2 Rolling the steel plate into a finish rolled product with the thickness of 0.075mm multiplied by 2 multiplied by the width of 940mm at the speed of 340m/min, the steel plate is rolled into a finish rolled product with the thickness of 0.05mm multiplied by 2 multiplied by the width of 940mm,
7. when cutting, a circular disc cutter is adopted to cut the finish rolling product with the thickness of 0.05mm multiplied by 2 multiplied by 940mm width into semi-finished products with the thickness of 0.05mm multiplied by 450mm multiplied by 2,
8. the product with the thickness of 0.05mm multiplied by 450mm enters an annealing furnace, an annealing process is adopted to rapidly heat up to 320 ℃ and preserve heat for 35 hours, then the product is cooled to 120 ℃ along with the furnace and taken out of the furnace, then the product is naturally cooled to normal temperature,
and (3) detecting the prepared aluminum foil: thickness of 0.0502mm, tensile strength of 99MPa, water brushing test A + And after the user compounding, the peel strength is tested to be 9.3N, and all performance indexes of the product exceed the requirements of the user.
Example 2
The production of the milk bottle cover foil 6t with the thickness of 0.03mm multiplied by 560mm does not need high-temperature sterilization and comprises the following steps:
1. the blank is cast-rolled 8011-H16, the thickness is 0.24mm, the width is 1170mm, the tensile strength is 172Mpa,
2. rough and medium rolling oil: viscosity 2.28mm 2 The flow is as follows, the flash point is 92 ℃ and the flow is as follows: 206-260 ℃, hydroxyl value of 9.2mgKOH/g, saponification value of 15.6mgKOH/g,
finish rolling oil: viscosity 1.98mm 2 S, flash point 82 ℃, flow: 205-255 ℃, hydroxyl value of 6.8mgKOH/g, saponification value of 9.4mgKOH/g,
3. a working roll with the rough rolling roughness of 0.23 mu m is adopted, the rolling force is 210 tons, the speed is 480m/min, and the inlet tension is 36N/mm 2 The outlet tension is 40N/mm 2 The 8011-H16 blanks with a thickness of 0.24mm were rolled to an intermediate product with an outlet thickness of 0.12,
4. replacing the working roll, adopting a medium roll with the roughness of 0.13 μm, the rolling force of 220 tons, the speed of 530m/min, and the inlet tension of 42N/mm 2 Outlet tension of 48N/mm 2 Rolling the steel plate into a medium rolling product with the thickness of 0.060mm,
5. the product with the thickness of 0.060mm is doubled and trimmed by a doubling machine to be 0.060mm multiplied by 2 multiplied by the width of 1150mm,
6. a finish rolling work roll with a roughness of 0.08 mu m is used, the rolling force is 220 tons, the speed is 400m/min, and the inlet tension is 45N/mm 2 The outlet tension is 50N/mm 2 Rolling the rolled product with the thickness of 0.060mm multiplied by 2 multiplied by 1150mm wide into a finished product with the thickness of 0.03mm multiplied by 2 multiplied by 1150mm wide,
7. when cutting, a circular disc cutter is adopted to cut the finish rolling product with the thickness of 0.03mm multiplied by 2 multiplied by the width of 1150mm into semi-finished products with the thickness of 0.05mm multiplied by 560mm,
8. and (3) putting the product with the thickness of 0.03mm multiplied by 560mm into an annealing furnace, adopting an annealing process to rapidly heat up to 350 ℃ and preserve heat for 35 hours, then cooling to 120 ℃ along with the furnace, discharging, and then naturally cooling to normal temperature.
And (3) detecting the prepared aluminum foil: thickness of 0.0306mm, tensile strength of 82Mpa, and water brushing test A + And after the user compounding, the peel strength is tested to be 8.3N, and all performance indexes of the product exceed the requirements of the user.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.

Claims (6)

1. A method for producing sealing aluminum foils with different finished product thicknesses in the same secondary process is characterized by comprising the following steps:
A. preparing materials, namely casting and rolling a blank by using aluminum alloy 8011 with the thickness of 0.24mm, wherein the state is H16, and the tensile strength is more than or equal to 170MPa;
B. rough rolling for one pass, fine rolling for double combination after middle rolling for one pass, and fine rolling for one pass of the double combined aluminum foil, wherein,
the final product is 0.05mm thick: the rough rolling inlet is 0.24mm, and the outlet is 0.14mm; the middle rolling inlet is 0.14mm, and the outlet is 0.075mm; the inlet of the finish rolling is 0.075mm, the outlet is 0.05mm, and the uncoiling tension is 38-45N/mm 2 ；
Alternatively, the final product is 0.04mm thick: the rough rolling inlet is 0.24mm, and the outlet is 0.13mm; the middle rolling inlet is 0.13mm, and the outlet is 0.065mm; the inlet of the finish rolling is 0.065mm, the outlet is 0.04mm, and the uncoiling tension is 38-50N/mm 2 ；
Alternatively, the final product is 0.03mm thick: the rough rolling inlet is 0.24mm, and the outlet is 0.12mm; the middle rolling inlet is 0.12mm, and the outlet is 0.06mm; the inlet of the finish rolling is 0.06mm, the outlet is 0.03mm, and the uncoiling tension is 38-50N/mm 2 ；
The rolling process parameters are as follows: the uncoiling tension is 30-40N/mm during rough rolling 2 Crimp tension of 35-45N/mm 2 The rolling speed is 500 +/-100 m/min, and the rolling oil temperature is 38-45 ℃; uncoiling tension of 35-45N/mm during intermediate rolling 2 The crimp tension is 45-50N/mm 2 The rolling speed is 450 +/-100 m/min, and the rolling oil temperature is 40-50 ℃; the coiling tension is 40-50N/mm during finish rolling 2 The rolling speed is 350 +/-100 m/min, and the rolling oil temperature is 40-55 ℃; the rolling force of three passes is 180 +/-50 t, and the plate profile curve is-32;
C. cutting the aluminum foil by a circular cutter;
D. annealing the cut aluminum foil, wherein,
the tensile strength of the final product is 95-110 MPa, and the peel strength is more than 8.5N:
the annealing parameters of the aluminum coil with the width specification of 400-500 mm are as follows: rapidly heating from room temperature to 320 ℃, preserving heat for 35h, naturally cooling to 120 ℃ along with the furnace, discharging and naturally cooling to room temperature;
the annealing parameters of the aluminum coil with the width specification of 500-600 mm are as follows: rapidly heating to 320 ℃ from room temperature, preserving heat for 40 hours by adopting rapid heating, naturally cooling to 120 ℃ along with the furnace, discharging from the furnace, and naturally cooling to room temperature;
the tensile strength of the final product is 70-90 MPa, and the peel strength is more than 8.5N:
the annealing parameters of the aluminum coil with the width specification of 400-500 mm are as follows: rapidly heating from room temperature to 350 ℃, preserving heat for 30h, naturally cooling to 120 ℃ along with the furnace, discharging and naturally cooling to room temperature;
the annealing parameters of the aluminum coil with the width specification of 500-600 mm are as follows: quickly heating the mixture from room temperature to 350 ℃, quickly heating the mixture, keeping the temperature for 35 hours, naturally cooling the mixture to 120 ℃ along with the furnace, discharging the mixture from the furnace, and naturally cooling the mixture to the room temperature.
2. The method for producing lidding aluminum foil of different finished thicknesses in the same pass as claimed in claim 1, wherein: and C, adopting No. 90 rolling oil as base oil during rough rolling and medium rolling in the step B, adopting two additives of alcohols and esters with high strength and high lubricating property as additives, and enabling the total content to reach 8-10%.
3. The method for producing lidding aluminum foil of different finished thicknesses in the same pass as claimed in claim 1, wherein: and in the step B, rolling oil No. 82 is used as base oil during finish rolling, the additives are high-strength and high-lubricating-property alcohols and esters, and the total content is controlled to be 6-8%.
4. The method for producing capping aluminum foil of different finished thickness in the same pass as claimed in claim 1, wherein: b, setting the convexity of the supporting roller for two passes of rough and medium rolling to be 20 per mill in the step B; a working roll: the convexity of the rough roller is 30 per mill, and the convexity of the medium roller is 30 per mill; the crown of the finishing roll was determined as: supporting roll 20 per mill and working roll 40 per mill.
5. The method for producing lidding aluminum foil of different finished thicknesses in the same pass as claimed in claim 1, wherein: b, the roughness Ra of the work roll in the rough rolling is 0.23 mu m, the roughness Ra of the work roll in the middle rolling is 0.15 mu m, and the roughness of the work roll in the finish rolling is 0.08 mu m; the roughness of the back-up rolls for the rough/medium/finish rolling was Ra0.43. Mu.m.
6. The method for producing capping aluminum foil of different finished thickness in the same pass as claimed in claim 1, wherein: in the annealing procedure in the step D, the rapid temperature rise means that no requirement is made on the temperature rise rate.
CN202211253275.7A 2022-10-13 2022-10-13 Method for producing sealing aluminum foils with different finished product thicknesses in same secondary process Pending CN115488151A (en)

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