5-series low-earing-rate aluminum alloy strip for lipstick tube and preparation method thereof

Abstract

The invention belongs to the technical field of aluminum alloy strip preparation, and discloses a 5-series low-temperature aluminum alloy strip for a lipstick tube, which comprises the following components: less than 0.05% of Si, less than 0.07% of Fe, less than 0.10% of Cu, 0.6-1.0% of Mg, less than 0.015% of Ti and the balance of Al and inevitable impurities. The invention further discloses a preparation method of the 5-series low-temperature aluminum alloy strip for the lipstick tube. The preparation method comprises the preparation steps of fusion casting, surface milling, homogenization treatment and hot rolling. According to the 5-series low-earing aluminum alloy strip for the lipstick tube, the earing rate of a cold-rolled product is controlled to be smaller than or equal to 3% through hot rolling large reduction and high finish rolling temperature and adjustment of texture components of hot rolling, the material loss of a user is reduced, and the 5-series low-earing aluminum alloy strip has popularization practicability.

Description

Technical Field

[0001] The invention belongs to the technical field of aluminum alloy strip preparation, and particularly relates to a 5-series low ear-making rate aluminum alloy strip for a lipstick tube and a preparation method thereof. Background Art

[0002] At present, high-end lipstick tubes are mainly made of 5657 grade cold-rolled strips through deep drawing. In the past, a large number of imported materials were used. As domestic aluminum processing technology becomes increasingly mature, imported materials are gradually replaced. However, with the fierce market competition, in order to improve the deep drawing efficiency and material utilization rate of lipstick tubes, the market generally requires that the earing rate of aluminum alloy materials used for lipstick tubes be less than or equal to 3%.

[0003] Under existing technical conditions, in order to control the earing rate of 5 series aluminum alloy cold-rolled materials for lipstick tubes within 3%, it is usually achieved by using air cushion furnace heat treatment in the cold rolling process or using two box furnace heat treatment processes in the cold rolling process.

[0004] Although the earing rate of the material can be controlled within 3% by using an air cushion furnace to anneal the 5 series aluminum alloy material for lipstick tubes during cold rolling, there are the following problems: 1). The production efficiency of the air cushion furnace is low, and its production speed is generally between 10 and 35 m / min, and natural gas is used for heating, which consumes a lot of energy and is costly; 2). The temperature of the air cushion furnace is high during heat treatment, and the strip is severely deformed during the heat treatment process, and is easy to contact with the furnace wall, resulting in surface damage and reducing the yield of the material.

[0005] Some companies use two box heat treatment processes in cold rolling, which can also control the ear-making rate of 5 series aluminum alloy materials for lipstick tubes to less than 3%. However, the two box heat treatments increase energy consumption, leading to increased production costs, which does not meet the country's low-carbon development requirements and also reduces cost competitiveness.

[0006] Therefore, the present invention urgently needs an aluminum alloy strip with low energy consumption, low cost and small earing rate and a preparation method thereof. Summary of the invention

[0007] In view of this, the present invention provides a 5 series low earing rate aluminum alloy strip for lipstick tubes and a preparation method thereof. The purpose of the present invention is to control the earing rate of the 5 series cold-rolled aluminum alloy material for lipstick tubes after single box annealing within 3% without increasing the production cost.

[0008] The internal anisotropy of the material is the fundamental reason for the earing rate. After the aluminum alloy material is fully recrystallized, a cubic texture is generated, and earing in the 0° and 90° directions is generated during deep drawing; after cold rolling, the grains are elongated and rotated in the deformation direction, which makes the mechanical properties of the plate in the rolling direction and the mechanical properties perpendicular to the rolling direction differ greatly, forming a rolling texture, and earing in the 45° direction is generated during deep drawing; earing control is to improve the rolling texture and recrystallization texture of the material, weaken the anisotropy of the material, and achieve a balance between the earing in the 0°, 90° and 45° directions during deep drawing.

[0009] The invention provides a 5 series low ear-making rate aluminum alloy strip for lipstick tubes, which consists of the following components by weight percentage: Si<0.05%, Fe<0.07%, Cu<0.10%, Mg 0.6-1.0%, Ti<0.015%, and the rest is Al and inevitable impurities.

[0010] Furthermore, the 5-series low-earing rate aluminum alloy strip for lipstick tube is composed of the following components by weight percentage: Si 0.03%, Fe 0.04%, Cu 0.08%, Mg 0.8%, Ti 0.009%, and the rest is Al, and inevitable impurities.

[0011] The present invention also provides a method for preparing a 5-series low-earing rate aluminum alloy strip for a lipstick tube, comprising the following steps:

[0012] S1. Melting and casting: The ingredients are prepared according to the aluminum alloy composition and weight percentage, and the alloy aluminum liquid is formed through melting, refining, slag removal and degassing. After the alloy aluminum liquid is cooled, the aluminum alloy ingot is obtained through semi-continuous casting;

[0013] S2, homogenization treatment: after sawing the head and tail of the aluminum alloy flat ingot obtained in step S1 and milling the surface, homogenization treatment is performed at a temperature of 450-500° C. for 4-6 hours;

[0014] S3, hot rolling: the aluminum alloy product after the homogenization treatment in step S2 is subjected to hot rough rolling at a starting rolling temperature of 400-450°C, the finishing rolling deformation is ≥80%, and the final rolling temperature is ≥330°C;

[0015] S4, cold rolling: cold rolling the product after hot rolling in step S3, and the deformation amount after cold rolling is 30-35%.

[0016] Furthermore, in step S3, the hot finishing rolling deformation amount ≥ 80% means that the hot rough rolled aluminum alloy material is rolled from 35 to 40 mm to 4.0 to 6.0 mm by hot continuous finishing rolling.

[0017] Furthermore, in step S3, the deformation amount of hot finishing rolling is 85%, the final rolling temperature is 340° C., and the thickness of the alloy product after hot finishing rolling is 4.5 mm.

[0018] Furthermore, in step S4, the earing rate of the product after cold rolling is ≤3%.

[0019] Beneficial effects:

[0020] The present invention provides a method for preparing a 5-series low-earing aluminum alloy strip for lipstick tubes, which can greatly reduce the anisotropy of aluminum and aluminum alloy materials after rolling. The present invention increases the deformation rate of hot finishing rolling, increases the hot final rolling temperature, adjusts the proportion of cubic texture after self-tempering, obtains fine recrystallized grains, and performs a box furnace annealing once to control the earing rate of the 5-series aluminum alloy cold-rolled strip for lipstick tubes within 3%, thereby reducing production costs and improving output efficiency.

[0021] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a flow chart of a method for preparing a 5-series low-earing rate aluminum alloy strip for a lipstick tube of the present invention;

[0023] Figure 2 The invention discloses a grain-refined structure of an aluminum alloy after hot finish rolling using the process of the invention. DETAILED DESCRIPTION

[0024] In order to make the technical solutions, advantages and purposes of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of this application.

[0025] Example 1

[0026] like Figure 1 As shown, this embodiment discloses a method for preparing a 5 series low-ear aluminum alloy strip for a lipstick tube, comprising the following steps:

[0027] S1. Melting and casting: The ingredients are prepared according to the aluminum alloy composition and weight percentage, and the alloy aluminum liquid is formed through melting, refining, slag removal and degassing. After the alloy aluminum liquid is cooled, the aluminum alloy ingot is obtained through semi-continuous casting;

[0028] In this embodiment, the aluminum alloy ingredients are Si 0.03%, Fe 0.04%, Cu 0.08%, Mg 0.8%, Ti 0.009% by weight, and the rest is Al. The aluminum alloy liquid is formed through melting, refining, slag removal and degassing, and finally semi-continuous casting is performed to form an aluminum alloy ingot.

[0029] The purity of the raw aluminum used in this embodiment is 99.90%;

[0030] The raw materials described in the preparation process of this embodiment can be directly purchased from the market;

[0031] S2, homogenization treatment: sawing the head and tail of the aluminum alloy flat ingot obtained in step S1, milling the surface, and then homogenizing it at a temperature of 460° C. for 6 hours;

[0032] S3, hot rolling: the aluminum alloy product after homogenization treatment in step S2 is subjected to hot rough rolling at a starting rolling temperature of 430° C., and then subjected to hot continuous finishing rolling, the finishing rolling deformation is 86%, the final rolling temperature is 340° C., the final rolling thickness is 4.5 mm, and finally a hot rolled billet with a cubic texture ratio of about 23% is obtained;

[0033] S4, cold rolling: cold rolling the product after hot rolling in step S3, and the deformation amount after cold rolling is 30%.

[0034] After testing and analysis, the earing rate of the 5 series low earing aluminum alloy strip for the lipstick tube prepared in this embodiment after cold rolling is 2.7%.

[0035] Example 2

[0036] like Figure 1 As shown, this embodiment discloses a method for preparing a 5 series low-ear aluminum alloy strip for a lipstick tube, comprising the following steps:

[0037] S1. Melting and casting: The ingredients are prepared according to the aluminum alloy composition and weight percentage, and the alloy aluminum liquid is formed through melting, refining, slag removal and degassing. After the alloy aluminum liquid is cooled, the aluminum alloy ingot is obtained through semi-continuous casting;

[0038] In this embodiment, the aluminum alloy ingredients are Si 0.02%, Fe 0.03%, Cu 0.03%, Mg 0.9%, Ti 0.010% by weight, and the rest is Al. The aluminum alloy liquid is formed through melting, refining, slag removal and degassing, and finally semi-continuous casting is performed to form an aluminum alloy ingot.

[0039] S2, homogenization treatment: sawing the aluminum alloy flat ingot obtained in step S1, cutting the head and tail, milling the surface, and then homogenizing it at 490° C. for 4 hours;

[0040] S2, homogenization treatment: after cutting the head and tail of the flat ingot and milling the surface, homogenization treatment is performed at a temperature of 490°C for 4 hours;

[0041] S3, hot rolling: the aluminum alloy product after homogenization treatment in step S2 is subjected to hot rough rolling at a starting rolling temperature of 450° C., and then subjected to hot continuous finishing rolling, the finishing rolling deformation is 90%, the final rolling temperature is 350° C., the final rolling thickness is 5 mm, and finally a hot rolled billet with a cubic texture ratio of about 26% is obtained;

[0042] S4, cold rolling: cold rolling the product after hot rolling in step S3, and the deformation amount after cold rolling is 32%.

[0043] After testing and analysis, the earing rate of the 5 series low earing aluminum alloy strip for the lipstick tube prepared in this embodiment after cold rolling is 2.2%.

[0044] Comparative Example

[0045] The preparation method of the original 5xxx aluminum alloy strip comprises the following steps:

[0046] S1. Melting and casting: Si 0.018%, Fe 0.04%, Cu 0.035%, Mg 0.86%, Ti 0.010% and the rest Al are formed into alloy aluminum liquid through melting, refining, slag removal and degassing, and finally semi-continuous casting is performed into aluminum alloy ingots;

[0047] S2. Ingot homogenization treatment: saw the head and tail of the flat ingot, mill the surface and then homogenize it in a pusher at a temperature of 490℃ for 5 hours;

[0048] S3, hot rolling: the alloy product after S2 homogenization treatment is subjected to hot rough rolling at a starting rolling temperature of 450°C, a finishing rolling deformation of 76%, and a final rolling temperature of 300°C, so that the thickness of the alloy product after hot finishing rolling is 4.5 mm.

[0049] S4, cold rolling: the product after hot rolling in S3 is cold rolled, and the deformation amount after cold rolling is 30%.

[0050] After testing and analysis, it was found that the earing rate of the 5 series low-earing aluminum alloy strip for lipstick tubes produced under this process condition was 4.7% after cold rolling.

[0051] The 5-series low-ear aluminum alloy strip for lipstick tubes and the preparation method thereof solve the problem of high ear rate of aluminum alloy produced by traditional processes, reduce the amount of trimming after stamping and stretching by users, save metal input, and improve the problem of die sticking caused by high ear rate.

[0052] The present invention aims to change the process design idea based on the existing heat treatment process, start from the hot rolling process, improve the internal structure of the material, so that the 5 series material for lipstick tubes after hot rolling can achieve self-annealing at high temperature to obtain fully recrystallized aluminum alloy hot rolled coils. According to the Sellars power index model and the limit deformation rate of hot finishing rolling, the deformation rate of hot finishing rolling passes is increased and the hot rolling final rolling temperature is increased to obtain fine hot rolling recrystallized grains (see Figure 2 ) lipstick tube uses 5 series aluminum alloy hot-rolled coil.

[0053] It is hereby declared that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should be included in the scope of the claims of the present invention.

Claims

1. A 5 series low ear-making rate aluminum alloy strip for lipstick tubes, characterized by: The alloy is composed of the following components by weight percentage: Si<0.05%, Fe<0.07%, Cu<0.10%, Mg 0.6~1.0%, Ti<0.015%, and the rest is Al and inevitable impurities.

2. The 5-series low-earing rate aluminum alloy strip for lipstick tube according to claim 1, characterized in that: It is composed of the following components by weight percentage: Si 0.03%, Fe 0.04%, Cu 0.08%, Mg 0.8%, Ti 0.009%, and the rest is Al, and inevitable impurities.

3. A method for preparing a 5-series low-earing rate aluminum alloy strip for a lipstick tube according to any one of claims 1 to 2, characterized in that: The following steps are involved: S1. Melting and casting: The ingredients are prepared according to the aluminum alloy composition and weight percentage, and the alloy aluminum liquid is formed through melting, refining, slag removal and degassing. After the alloy aluminum liquid is cooled, the aluminum alloy flat ingot is obtained through semi-continuous casting; S2, homogenization treatment: after sawing the head and tail of the aluminum alloy flat ingot obtained in step S1 and milling the surface, homogenization treatment is performed at a temperature of 450-500° C. for 4-6 hours; S3, hot rolling: the aluminum alloy product after the homogenization treatment in step S2 is subjected to hot rough rolling at a starting rolling temperature of 400-450°C, the finishing rolling deformation is ≥80%, and the final rolling temperature is ≥330°C; S4, cold rolling: cold rolling the product after hot rolling in step S3, and the deformation amount after cold rolling is 30-35%.

4. The method for preparing a 5-series low-earing rate aluminum alloy strip for a lipstick tube according to claim 3, characterized in that: In the step S3, the hot finishing rolling deformation amount ≥ 80% means that the hot rough rolled aluminum alloy material is rolled from 35 to 40 mm to 4.0 to 6.0 mm by hot continuous finishing rolling.

5. The method for preparing a 5-series low-earing rate aluminum alloy strip for lipstick tube according to claim 3, characterized in that: In the step S3, the deformation amount of hot finishing rolling is 85%, the final rolling temperature is 340° C., and the thickness of the alloy product after hot finishing rolling is 4.5 mm.

6. The method for preparing a 5-series low-earing rate aluminum alloy strip for lipstick tube according to claim 3, characterized in that: In the step S4, the earing rate of the product after cold rolling is ≤3%.

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