• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Aluminum rolling process for fine grain applications. The present invention describes aluminum rolling process comprising a step a) of hot rolling at an initial temperature between 450-500ºC to a final temperature between 360-400º c, obtaining an aluminum sheet with a thickness of between 8 and 12 mm ; and a step b) of cold rolling where lamination passes are interposed at a temperature between 75 and 120ºC with an intermediate sub-stage of heat treatment at a temperature between 340 and 390º c, until an aluminum sheet with a final thickness of between 0.3 and 1 mm. Also the object of the invention is the laminated aluminum obtained by the process detailed in the present application and its use in manufacturing containers for the cosmetic and perfume industry. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2653729A1
    申请号:ES201631077
    申请日:2016-08-05
    公开日:2018-02-08
    发明作者:Catalina Fernandez Rivera；David BRAVO ESPINOSA
    申请人:Acr Ii Aluminium Group Coop U A；Acr Ii Aluminium Group Cooperatief Ua；
    IPC主号:
    专利说明:

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    DESCRIPTION
    ALUMINUM LAMINATION PROCESS FOR FINE GRAIN APPLICATIONS SECTOR OF THE TECHNIQUE
    The present patent application describes an aluminum lamination process that allows obtaining a product especially suitable for use in the manufacture of packaging for the cosmetic and perfume industries.
    BACKGROUND
    Laminated aluminum products whose application is intended for the cosmetic or perfume packaging market require particularly demanding conditions of conformation and surface quality compared to other products. An excellent response of the metal to the surface chemical treatments that are applied in the manufacturing process of these packages is necessary, for example, chemical polishing, electro-polishing, anodizing, lacquering, etc. Additionally, an adequate combination of mechanical properties of the metal is also necessary to offer an optimal response to the metal drawing treatments to form the final piece.
    When the laminated aluminum obtained by the process used to date by Aludium transformaciones de Productos, SLU is used, a process referred to in this patent application as "standard procedure", for the manufacture of packages, and this manufacture includes applying surface treatments, produces a striated appearance, not uniform and, therefore, the manufactured packaging does not meet the demanding requirements of the cosmetic and perfume industry.
    Unlike other rolling processes known to date, the aluminum rolling process described in this patent application allows to obtain rolled aluminum with formability and surface quality properties that meet the requirements to be used in the manufacture of packaging for the cosmetic and pharmaceutical industries.
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    DESCRIPTION
    In a first aspect, the present patent application refers to an aluminum rolling process comprising a stage a) hot rolling and a stage b) cold rolling, characterized in that:
    in step a) hot rolling, the temperature decreases from an initial temperature between 450-500 ° C, preferably, at an initial temperature of 500 ° C, to a final temperature between 360-400 ° C, preferably, at a final temperature of 380 ° C, obtaining an aluminum sheet with a thickness between 8 and 12 mm, preferably 10 mm thick; Y
    in stage b) cold rolling, rolling passes are interleaved at a temperature between 75 and 120 ° C, preferably at a temperature of 75 ° C with an intermediate heat treatment sub-stage at a temperature between 340 and 390 ° C , preferably, at a temperature of 350 ° C, and for a time between 3 and 5 hours, preferably, for 4 hours, until an aluminum sheet with a final thickness of between 0.3 and 1.0 mm is obtained.
    In the present patent application it should be understood that "aluminum" comprises both pure metal and alloys of this metal. In particular, aluminum alloys comprising magnesium as the main alloying compound. Accordingly, the present invention refers to a rolling process of pure aluminum or any combination of aluminum.
    In a preferred embodiment of the present invention, in the hot rolling stage, the temperature decreases from a temperature of approximately 500 ° C to a final temperature of 380 ° C, obtaining an aluminum sheet with a thickness of 10 mm; and in the cold rolling stage, rolling passes are interleaved at a temperature of approximately 75 ° C, the intermediate heat treatment sub-stage being at a temperature of approximately 350 ° C for 4 hours.
    In the intermediate heat treatment sub-stage, also called the "intermediate total annealing sub-stage", the aluminum sheet is subjected to a temperature between 340 and 390 ° C, preferably over a period of 4 hours. temperature within this range can be heated aluminum foil, preferably in shape
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    coil, in an oven for a period that can be up to 16 hours. In another preferred embodiment, in the intermediate heat treatment sub-stage, the aluminum sheet is subjected to a temperature of approximately 350 ° C for 4 hours.
    Thus, the rolling process of the present invention comprises two stages of rolling under different conditions, so that in the hot rolling stage it is possible to reduce the thickness of the aluminum from the thickness of the cast plate, generally 600 mm, to a thickness between 8 and 12 mm, preferably up to 10 mm thick; and in the cold rolling stage, the thickness is reduced from 8 to 12 mm, to the final required thickness, between 0.3 and 1 mm. The combination of both stages, carried out in series, allows to obtain an improved surface quality, especially suitable for using the rolled aluminum obtained in the manufacture of containers for the cosmetic and perfume industry.
    In the aluminum lamination process of the present invention, each of the steps may comprise several lamination passes by a roller system or similar device known to the expert to perform the aluminum lamination. In particular, the hot rolling stage may comprise between 15 and 20 passes of the sheet aluminum by the roller system or similar device to obtain an aluminum sheet with a thickness between 8 and 12 mm, and preferably, a thickness of 10 mm
    In preferred embodiments, the aluminum rolling process described in this patent application comprises, after step b) cold rolling, a heat treatment at a temperature between 220 and 260 ° C of the aluminum sheet, preferably during a period of between 4 and 6 hours. This stage of the process of the invention, also referred to herein as "final partial annealing stage" allows to improve the formability of the metal in the processes, such as forming or drawing, in which the laminated aluminum obtained will be used. an even more preferred embodiment, the heat treatment after the cold rolling stage, is carried out at a temperature of 260 ° C for 5 hours.
    The standard procedure also comprised a hot rolling stage, but the conditions were different from those of the method of the present invention. Under these conditions a reduction of thickness was achieved in the last hot rolling pass of between 35 and 55%, a grain structure without recrystallizing completely after the stage
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    of hot rolling, and with a coarse grain of 100-140 ^ m of medium size, measured by the interception method (ASTM E-112-88) (see figure 1a).
    Advantageously, in the rolling process of the present invention it is achieved that the thickness reduction in the last hot rolling pass is between 45-75%, preferably 65% and, after the hot rolling stage, a fully recrystallized grain structure with a fine grain size, between 50 and 90 µm, and preferably, 60 microns of medium grain size, measured by the interception method (ASTM E-112-88), can be achieved, and a high thickness, between 8 and 12 mm, and preferably 10 mm thick (see figure 1b).
    The objective of stage b) cold rolling is to obtain a grain structure as thin and deformed as possible, as this will positively influence the surface quality of the final product. To achieve this, it is necessary to insert, between the different passes included in cold rolling, a sub-stage of total intermediate annealing at a temperature between 340 and 390 ° C, preferably at a temperature of 350 ° C. Once the set temperature has been reached, for which it may be necessary up to 16 hours, the aluminum foil is maintained in this temperature range for a period of between 3 and 5 hours, preferably, for 4 hours. This intermediate total annealing sub-stage is necessary in the process of the present invention, since it is not possible to obtain a final fine grain (between 50 and 90 ^ m, preferably between 80 and 90 ^ m) by rolling directly from the roughing of hot (between 8 and 12 mm, preferably 10 mm) to the final thickness between 0.3 and 1 mm. In addition, there would be a high risk of starting secondary recrystallization during final partial annealing, which would adversely affect the surface appearance of the anodized parts. By means of the standard cold rolling process, a final material with a very heterogeneous grain structure with 120-160 ^ m thick sizes and a deformation of 60-80% was obtained (see Figure 2a).
    In this cold rolling stage of the process it is important to establish the thickness at which the intermediate heat treatment intermediate sub-stage, also referred to in this patent application is called "intermediate total annealing sub-stage", to obtain a final grain balanced between size and deformation Thus, the smaller the thickness of the sheet when the total intermediate annealing is applied, the finer the final grain that is obtained. On the other hand, the greater the thickness of the sheet when the intermediate total annealing is applied, greater deformation is achieved.
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    Preferably, the intermediate heat treatment sub-stage is made with a sheet thickness between 3 and 5 mm, preferably with a thickness of 4 mm. In this way, the aluminum lamination process of the present invention allows to obtain a homogeneous grain structure with a fine size 60-90 ^ m, preferably a fine size between 80-90 ^ m, and a deformation between 70-90 %, preferably, between 80-90%, depending on the final thickness (see figure 2b).
    Additionally, the present invention also relates to laminated aluminum obtained by the lamination process described in this patent application. Preferably, rolled aluminum with a final thickness between 0.3 and 1.0 mm.
    The rolled aluminum obtained by the lamination process described in this patent application can be presented in the form of multiband cut coils with a width range from 24mm to 1,250mm. Additionally, this product may have states H22, H24 or H26, in accordance with international standard UNE-EN 485-2.
    In preferred embodiments of the present invention, the rolled aluminum obtained by the process described in this patent application may have different finishes such as gloss, greater roughness, low anisotropy, matte finish with 3xxx code alloys, that is, alloys of aluminum characterized by having manganese as the main alloy, and application of high purity band (with lower Fe and Si content), depending on the requirements of the packaging manufacturer.
    This patent application also refers to the use of rolled aluminum obtained by the process described in this patent application to manufacture containers for the cosmetic and perfume industry.
    BRIEF DESCRIPTION OF THE FIGURES
    Figure 1: Grain structure obtained after the hot rolling stage according to the standard procedure (fig. 1a) and according to the aluminum rolling process described in this patent application (fig. 1b).
    Figure 2: 3D grain structure obtained by the standard procedure (fig. 2a) and by the aluminum lamination process described in this patent application (fig. 2b).
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    Examples
    Example 1: Aluminum lamination process
    First, a roller system is heated to an initial temperature of 500 ° C. Once this temperature is reached, an aluminum sheet with an initial thickness of 600 mm is passed through the roller system. This lamination process is repeated 15 and 20 times, gradually decreasing the temperature of the system to a final temperature of 380 ° C, obtaining an aluminum sheet with a thickness of 10 mm.
    Once the established thickness is reached, the coil-shaped aluminum sheet is transferred to another roller system that works at a lower temperature, approximately 75 ° C, and the aluminum sheet obtained in the previous stage is passed through this system of cold rolling rollers. This lamination process is carried out successively until a thickness of 4 mm is obtained.
    Next, the aluminum foil obtained, in the form of a coil, is subjected to an intermediate heat treatment sub-stage at a temperature of 350 ° C. To carry out the intermediate heat treatment (total intermediate annealing), the aluminum coil is heated in an oven to reach a temperature of 350 ° C and then maintained for 4 hours at this temperature. After this period, it is taken out of the oven and allowed to temper to a temperature of approximately 70 ° C.
    Subsequently, the aluminum sheet is passed through the roller system at a temperature of 75 ° C until a sheet with the desired final thickness is obtained: from 1mm to 0.3mm.
    Finally, the aluminum sheet obtained by the process described above is subjected to heat treatment at a temperature of 260 ° C for a period of 5 hours. To perform this treatment, rolled aluminum coils are placed in an oven and heated to reach the set temperature. It is then maintained in this temperature range for a period of 5 hours.
    权利要求:
    Claims (5)
    [1]
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    1. - An aluminum rolling process comprising a stage a) hot rolling and a stage b) cold rolling, characterized in that:
    in stage a) hot rolling, the temperature decreases from an initial temperature between 450-500 ° C to a final temperature between 360-400 ° C, obtaining an aluminum sheet with a thickness between 8 and 12 mm; Y
    in stage b) cold rolling, rolling passes are interleaved at a temperature between 75 and 120 ° C with an intermediate heat treatment sub-stage at a temperature between 340 and 390 ° C, until an aluminum foil is obtained with a final thickness of between 0.3 and 1mm.
    [2]
    2. - The aluminum lamination process according to claim 1, wherein the intermediate heat treatment sub-stage is carried out for a period between 3 and 5 hours.
    [3]
    3. - The aluminum rolling process according to any one of claims 1 or 2, wherein in the hot rolling stage, the temperature decreases from a temperature of 500 ° C to a final temperature of 380 ° C, obtaining an aluminum sheet with a thickness of 10 mm; and where in the cold rolling stage, rolling passes are interleaved at a temperature of 75 ° C being the intermediate heat treatment sub-stage at a temperature of 350 ° C for 4 hours.
    [4]
    4. - Laminated aluminum obtained by the lamination process described in any one of claims 1 to 3.
    [5]
    5. - Use of the laminated aluminum described in claim 4 to manufacture containers for the cosmetic and perfume industry.
    image 1
    Fig. 1a
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    Fig. 1b
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    Fig. 2a
    Fig. 2b
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    引用文献:
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    CN104532075A|2014-12-31|2015-04-22|中铝西南铝冷连轧板带有限公司|Aluminum alloy substrate for high-cap bottle cap and production method thereof|
    法律状态:
    2017-09-29| PC2A| Transfer of patent|Owner name: ACR II ALUMINIUM GROUP COOPERATIEF U.A. Effective date: 20170925 |
    2018-11-16| FG2A| Definitive protection|Ref document number: 2653729 Country of ref document: ES Kind code of ref document: B1 Effective date: 20181116 |
    优先权:
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