Ti-added 1-series aluminum alloy cast rolling method with low Al-Ti-B dosage
By using a split front box structure and ultrasonic treatment in the casting and rolling process, the problems of high Al-Ti-B content and uneven titanium distribution in the casting and rolling of 1-series aluminum alloys have been solved, achieving low-cost, high-quality aluminum alloy production.
Patent Information
- Application Number
- CN202511411199.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-29
- Publication Date
- 2025-11-18
AI Technical Summary
The existing 1-series aluminum alloy casting and rolling process has high Al-Ti-B content, high production cost, and uneven distribution of titanium elements, which affects the stability of product quality.
The casting and rolling system adopts a split front box structure. Titanium wire and Al-Ti-B wire are added online in the auxiliary box and combined with ultrasonic treatment. The ultrasonic frequency is 20±2kHz and the total ultrasonic power is ≥200W to ensure that the titanium wire and Al-Ti-B wire are fully dissolved and dispersed in the aluminum liquid.
Reducing Al-Ti-B usage by 30-50% reduces production costs by 80-120 yuan/ton, refines grain size by 40-60%, increases elongation by 15-25%, enhances tensile strength by 10-18%, shortens production cycle by 15-20%, and improves product quality stability.
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Figure CN120961867A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of aluminum alloy processing and manufacturing, in particular to a low Al-Ti-B dosage casting-rolling method for 1-series aluminum alloy with Ti addition. BACKGROUND
[0002] As the most widely used pure aluminum series alloy in industry, 1-series aluminum alloy occupies an important position in many fields such as electronics, food packaging, and building decoration, due to its excellent electrical conductivity, good corrosion resistance, and excellent processing and forming performance. In the casting-rolling production process of 1-series aluminum alloy, Al-Ti-B refiner and titanium element are usually added to the aluminum liquid to refine the alloy grain structure and improve the comprehensive performance of the material.
[0003] However, the existing casting-rolling process of 1-series aluminum alloy has many problems to be solved. In terms of raw material use, the traditional process often needs to add a large amount of Al-Ti-B wire and titanium element to achieve the expected grain refinement effect, resulting in a significant increase in production cost. For example, an aluminum processing enterprise needs to consume 1 kg of Al-Ti-B wire per ton of 1-series aluminum alloy, and the titanium element addition is also relatively high. The raw material cost alone accounts for a large proportion of the total product cost. In terms of process operation, the traditional titanium supplement process is usually carried out in the smelting or refining stage, which not only requires frequent adjustment of smelting temperature, time and other process parameters, but also has a complex operation process. Moreover, it is easy to cause uneven distribution of titanium element in the aluminum liquid, which leads to segregation of alloy organization and seriously affects the stability of product quality. In addition, the Al-Ti-B refiner and titanium element in the conventional casting-rolling process are difficult to fully dissolve and uniformly disperse, which cannot fully play the role of grain refinement, and cannot meet the increasingly stringent requirements of high-end market for aluminum alloy plate quality.
[0004] Therefore, it is of great practical significance and application value to develop a new casting-rolling method for 1-series aluminum alloy with Ti addition, which can effectively reduce the Al-Ti-B dosage, simplify the titanium supplement process, and improve the quality of casting-rolling products. SUMMARY
[0005] The purpose of the present application is to provide a low Al-Ti-B dosage casting-rolling method for 1-series aluminum alloy with Ti addition, which can solve the problems existing in the prior art, significantly reduce the Al-Ti-B dosage, simplify the titanium supplement process, improve the production efficiency, and reduce the comprehensive production cost while ensuring the quality of 1-series aluminum alloy casting-rolling products.
[0006] To achieve the above purpose, the present application provides the following solutions:
[0007] The present application provides a low Al-Ti-B dosage casting-rolling method for 1-series aluminum alloy with Ti addition, which uses a split front box in the casting-rolling system, and the split front box comprises a main box body and a vice box body connected in communication.
[0008] The material of the auxiliary box satisfies the following thermal shock and strength toughness indexes: critical thermal shock temperature difference ≥ 300℃, strength loss ≤ 30% after 1000℃ to 25℃ cycle for 500 times, and fracture toughness ≥ 9MPa·m 1 / 2, and ultrasonic frequency change ≤ 5kHz within 500h under the action of 20kHz ultrasonic;
[0009] The Ti-added 1-series aluminum alloy low-Al-Ti-B dosage casting-rolling method comprises the following steps:
[0010] The molten aluminum after smelting and filtering treatment is introduced into the auxiliary box, titanium wires and Al-Ti-B wires are synchronously added into the molten aluminum in the auxiliary box, and ultrasonic treatment is performed on the molten aluminum in the auxiliary box; after the titanium wire element and the Al-Ti-B wire element are dissolved and dispersed in the molten aluminum in the auxiliary box, the molten aluminum flows into the main box, and then flows into the casting nozzle from the main box for casting-rolling to obtain a 1-series aluminum alloy casting-rolling material;
[0011] The action center of the ultrasonic treatment covers the adding area of the titanium wires and the Al-Ti-B wires; and the ultrasonic vibration of the ultrasonic treatment covers the molten aluminum in the auxiliary box.
[0012] As a further preferred embodiment of the present application, the ultrasonic frequency of the auxiliary box is 20±2kHz, and the total ultrasonic power is ≥ 200W.
[0013] As a further preferred embodiment of the present application, the titanium wire addition amount in the auxiliary box is 0.001-0.05% per ton of Al based on the amount of molten aluminum.
[0014] As a further preferred embodiment of the present application, the Al-Ti-B wire addition amount in the auxiliary box is 0.0001-0.05kg per ton of Al based on the amount of molten aluminum.
[0015] As a further preferred embodiment of the present application, the temperature of the molten aluminum is 690-720℃.
[0016] As a further preferred embodiment of the present application, the 1-series aluminum alloy comprises an aluminum alloy with a grade of 1050, 1060, 1100, 1145 or 1235.
[0017] As a further preferred embodiment of the present application, the adding area of the titanium wires and the Al-Ti-B wires in the auxiliary box is: distance from the inner wall ≥ 1 / 3S l and ≥ 1 / 3S w , S l and S w are the length and width of the auxiliary box, respectively.
[0018] As a further preferred embodiment of the present application, the auxiliary box adopts ultrasonic auxiliary structure.
[0019] In the present application, the auxiliary box preferably adopts an integrated ultrasonic auxiliary structure; more preferably, the ultrasonic treatment is applied at the bottom of the auxiliary box.
[0020] The present application also provides a 1 series aluminum alloy prepared by the above preparation method.
[0021] The titanium and Al-Ti-B adding process of the present application can reduce the amount of Al-Ti-B by 30%-50% compared with the traditional process, while reducing the energy consumption of the melting and refining titanium supplement link. Actual production verification shows that the production cost of each ton of aluminum alloy can be reduced by 80-120 yuan.
[0022] The auxiliary box of the present application adopts high-performance materials, has excellent thermal shock resistance and toughness, can effectively resist the frequent temperature change impact in the casting and rolling process, prolong the service life of the auxiliary box, reduce the equipment maintenance cost and downtime; stable ultrasonic performance ensures the consistency of element mixing effect, and ensures the stable and reliable product quality.
[0023] In the present application, the auxiliary box is the core functional unit for realizing the technical effect, providing a processing space for online addition of titanium wire and Al-Ti-B wire, combining with a specific ultrasonic treatment method, utilizing cavitation effect, microjet and acoustic flow, etc., realizing the technical effects of reducing the amount of Al-Ti-B by 30%-50% and refining the grain size by 40%-60%; the strictly controlled thermal shock resistance and ultrasonic stability of the auxiliary box of the present application guarantee the uniformity of element dispersion in long-term production, laying a foundation for improving the product quality stability, and the position limitation of the wire addition area further strengthens the accuracy of ultrasonic action, avoiding the entry of unsolved particles into the subsequent link. The main box as a functional matching unit of the auxiliary box can ensure the stable delivery of aluminum liquid, avoid the influence of ultrasonic disturbance in the auxiliary box on the feeding of the casting nozzle, realize the improvement of the mechanical properties of the product (the elongation is increased by 15%-25%, and the tensile strength is increased by 10%-18%) in cooperation with the auxiliary box, and the production cycle is shortened by 15%-20% in cooperation.
[0024] The present application discloses the following technical effects:
[0025] The present application realizes the reduction of the amount of Al-Ti-B wire by 30-50% and the significant reduction of production cost by the structural design of the split front box, combined with the process of online addition of titanium wire and Al-Ti-B wire in the auxiliary box and synchronous ultrasonic treatment.
[0026] In the present application, the ultrasonic action promotes the dissolution and dispersion of titanium wire and Al-Ti-B wire in the aluminum liquid, the grain size is reduced by 40%-60%, the elongation is increased by 15%-50%, and the tensile strength is increased by 10%-45%.
[0027] The product quality stability is greatly improved; the titanium supplement link is integrated to be completed on-line in the auxiliary box, the complex operation of smelting and refining links is reduced, the production cycle is shortened by 15%-20%, the process is effectively simplified and the operation strength is reduced, the human factor interference to the product quality is reduced, and the production stability is improved. BRIEF DESCRIPTION OF DRAWINGS
[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.
[0029] Figure 1 It is a structural schematic diagram of a split front box used in the casting and rolling system of the present application; wherein, 1-ultrasonic emission plate, 2-inlet port, 3-auxiliary box body, 4-main box body, 5-outlet port.
[0030] Figure 2 It is a contrast reference graph of aluminum alloy micro-morphology.
[0031] Figure 3 It is a refinement effect graph of the aluminum alloy prepared by the split front box scheme of embodiment 1 of the present application. DETAILED DESCRIPTION
[0032] The various exemplary embodiments of the present application will now be described in detail, which should not be considered as limiting the present application, but should be understood as a more detailed description of certain aspects, characteristics and embodiments of the present application.
[0033] It should be understood that the terms described in the present application are only for describing the specific embodiments, and are not used to limit the present application. In addition, for the numerical range in the present application, it should be understood that each intermediate value between the upper limit and the lower limit of the range is also specifically disclosed. Each smaller range between any stated value or intermediate value in the stated range, and any other stated value or intermediate value in the stated range, is also included in the present application. The upper limit and the lower limit of these smaller ranges can be independently included or excluded from the range.
[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present application, preferred methods and materials are described. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials in connection with which the documents are cited. In the case of conflict between the content of this specification and that of any document incorporated by reference, the content of this specification prevails.
[0035] Many modifications and variations of the described implementations of the application can be made without departing from its spirit or scope, as will be apparent to those skilled in the art. Other implementations of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. The specification and examples given are exemplary only.
[0036] As used herein, the terms "comprise", "comprising", "include", "including", "have", "having" and the like are open-ended terms that are intended to mean "including but not limited to".
[0037] The technical solutions of the application are further described below in combination with specific examples and drawings. It should be noted that the application does not describe in detail the conventional operation means in the art, and is not the focus of the application.
[0038] Figure 1 A structure diagram of a split front box used in the casting and rolling system of the application; wherein, 1 - ultrasonic emission plate, 2 - inlet port, 3 - auxiliary box body, 4 - main box body, 5 - outlet port.
[0039] Example 1 1060 aluminum alloy casting and rolling
[0040] In this example, the casting and rolling front box is provided in a split structure, and the auxiliary box body contained therein is made of a material meeting the performance index to form an ultrasonic auxiliary integrated structure; the auxiliary box body bottom and the ultrasonic tool head are designed in an integrated manner (see structure diagram Figure 1 ). The performance index of the auxiliary box body material is as follows: critical thermal shock temperature difference 400℃, strength loss about 20% after 1000℃ to 25℃ cycle for 500 times, fracture toughness 9.5MPa·m 1 / 2, and ultrasonic frequency change to 5kHz within 500h under the action of 20kHz ultrasonic.
[0041] The casting and rolling steps are as follows:
[0042] S1. The aluminum liquid treated by melting and filtering is introduced into the auxiliary box body through the flow channel, and the aluminum liquid temperature in the auxiliary box body is controlled to be 690℃.
[0043] S2. Simultaneously adding pure titanium wire and Al-Ti-B wire material into the molten aluminum in the sub-tank, wherein the mass ratio of pure titanium wire to molten aluminum is 0.001% / t Al, and the adding amount of Al-Ti-B wire material is 0.0001 kg / t Al; synchronously starting the ultrasonic function of the sub-tank to perform ultrasonic treatment, and setting the ultrasonic frequency to 20 kHz and the total power to 200 W; after the molten aluminum completes the treatment in the sub-tank, the molten aluminum flows into the main tank of the split front tank, and then flows into the casting nozzle from the main tank for casting and rolling. The adding area of the pure titanium wire and the Al-Ti-B wire material in the sub-tank satisfies the following position requirements: ≥1 / 3S l and ≥1 / 3S w , wherein S l is the length dimension of the sub-tank (400 mm), and S w is the width dimension of the sub-tank (400 mm).
[0044] After the casting and rolling of the 1060 aluminum alloy cast blank in this embodiment, the grain structure of the cast blank is uniform and fine, and the whole cast blank is II grade according to the metallographic grade, which is the same as the traditional process. Under the aluminum production of 20 t / day, the Al-Ti-B consumption is reduced by 40% compared with the traditional process, the titanium supplement amount is reduced by 20%, the grain size is reduced by 45%, the cost is greatly reduced, the elongation reaches 5.1%, which is increased by 46% compared with the traditional process (3.5%), the tensile strength reaches 146 MPa, which is increased by 15% compared with the traditional process (127 MPa). And under the same production, the production cycle is shortened by 15%.
[0045] In the traditional process, a single structure front tank is used, and the front tank does not have a sub-tank. The main body of the front tank is made of ordinary refractory material, and does not have the characteristics of thermal shock resistance and ultrasonic auxiliary function. The titanium supplement operation is performed in the smelting link, and the Al-Ti-B wire material is added in the chute before the degassing tank. The adding amount of the Al-Ti-B refiner is 0.1 wt.%.
[0046] Figure 2 FIG. 1 is a micro-morphology contrast reference diagram of an aluminum alloy. Figure 3 FIG. 2 is a refinement effect diagram of an aluminum alloy prepared by using the split structure front tank scheme in embodiment 1 of the present application.
[0047] Comparative example 1
[0048] The difference between comparative example 1 and embodiment 1 is that the ultrasonic treatment is performed by immersing the split rod-shaped probe (diameter φ40 mm) from above the sub-tank. As a result, the grain structure of the cast blank after casting and rolling is coarse, and the product is unqualified.
[0049] Comparative example 2
[0050] The difference between comparative example 2 and embodiment 1 is that the critical thermal shock temperature difference of the sub-tank material is 100℃. As a result, the front tank structure cracks during the casting and rolling process, and the casting and rolling fails.
[0051] Comparative Example 3
[0052] The only difference from Example 1 is that the ultrasonic frequency of the auxiliary housing material changed to 20 kHz within 500 hours under 20 kHz ultrasonic treatment. This resulted in coarse microstructure in the later stages of the cast billet, unstable processing, and substandard products.
[0053] Comparative Example 4
[0054] The only difference from Example 1 is that the ultrasonic frequency for ultrasonic treatment in the secondary housing is 30 kHz. This results in a slightly coarser microstructure in the cast billet.
[0055] Comparative Example 5
[0056] The only difference from Example 1 is that the ultrasonic frequency for ultrasonic treatment in the secondary housing is 100 kHz. This results in a slightly coarser microstructure in the cast billet.
[0057] Comparative Example 6
[0058] The only difference from Example 1 is that the pure titanium wire content in the auxiliary box was 0.0005% / t Al by mass of aluminum liquid. This resulted in a coarse-grained billet structure with cracked edges, leading to substandard products.
[0059] Comparative Example 7
[0060] The only difference from Example 1 is that the pure titanium wire content in the auxiliary box was 0.1% / tAl by mass of aluminum liquid. This resulted in a coarse-grained billet structure with cracked edges, leading to substandard products.
[0061] Comparative Example 8
[0062] The only difference from Example 1 is that the amount of Al-Ti-B wire added to the sub-box is 0.00005 kg / t Al. This results in a slightly coarser microstructure in the cast billet.
[0063] Comparative Example 9
[0064] The only difference from Example 1 is that the amount of Al-Ti-B wire added to the secondary casing is 0.1 kg / t Al. This results in edge cracking in the cast billet structure, a high content of hard phase, and increased costs.
[0065] Comparative Example 10
[0066] The only difference from Example 1 is that the temperature of the molten aluminum in the auxiliary box is 680°C. This resulted in large-area porosity defects during the casting and rolling process, leading to casting and rolling failure.
[0067] Comparative Example 11
[0068] The only difference from Example 1 is that the temperature of the molten aluminum in the sub-tank is 730℃. As a result, the microstructure of the cast slab is obviously columnar crystal region, and serious edge cracks appear.
[0069] Comparative Example 12
[0070] The only difference from Example 1 is that the distance between the titanium wire and the Al-Ti-B wire in the sub-tank is 1 / 5S l , 1 / 4S w , S l and S w are the length and width dimensions of the sub-tank, respectively. As a result, the microstructure of the cast slab is uneven, coarse columnar crystals appear in the center, and edge cracks appear.
[0071] Example 2 1100 aluminum alloy casting and rolling
[0072] In this example, the pre-tank used for casting and rolling is designed as a split structure, and the sub-tank body thereof is made of a material meeting the performance index to form an ultrasonic auxiliary integrated structure; the bottom of the sub-tank body and the ultrasonic tool head are designed in an integrated manner (see the structural diagram in Figure 1 ). The performance index of the sub-tank body material is as follows: the critical thermal shock temperature difference is 400℃, the strength loss is about 20% after 500 cycles from 1000℃ to 25℃, the fracture toughness is 9.2MPa·m 1 / 2, and the ultrasonic frequency changes to 5kHz within 500h under the action of 20kHz ultrasonic waves.
[0073] The casting and rolling steps are the same as in Example 1.
[0074] After casting and rolling according to this example, the 1100 aluminum alloy cast slab has uniform and fine grain structure, and the whole is grade II, which is not different from the traditional process. Compared with the metallographic grade, under the aluminum production of 20t / day, the Al-Ti-B dosage is reduced by 30% compared with the traditional process, the titanium supplement amount is reduced by 25%, the grain size is reduced by 52%, and the cost is greatly reduced. The elongation reaches 4.3%, which is increased by 39% compared with the traditional process (3.1%), and the tensile strength is 152MPa, which is increased by 16% compared with the traditional process (131MPa). And under the same production, the production cycle is shortened by 18%.
[0075] Among them, the traditional process uses a single structure pre-tank without a sub-tank, and the main body of the pre-tank is made of ordinary refractory material without thermal shock resistance and ultrasonic auxiliary function. The titanium supplement operation is carried out at the smelting link, and the Al-Ti-B wire material is added in the chute before the degassing tank. Among them, the addition amount of Al-Ti-B refiner is 0.1wt.%.
[0076] The above described embodiments are only to illustrate the preferred modes of the present application, and are not intended to limit the scope of the present application. Any modification and improvement made by those skilled in the art to the technical solutions of the present application without departing from the design spirit of the present application shall fall within the protection scope of the present application.
Claims
1. A casting and rolling method for Ti-added 1-series aluminum alloys with low Al-Ti-B content, characterized in that, The casting and rolling system used adopts a split front box, which includes a main box and a secondary box that are connected to each other; The material of the sub-box body meets the following specifications: critical thermal shock temperature difference ≥300℃, strength loss ≤30% after 500 cycles from 1000℃ to 25℃, and fracture toughness ≥9MPa·m. 1 / 2, and the change in ultrasonic frequency within 500 hours under the action of 20kHz ultrasound is ≤5kHz; The method for casting and rolling Ti-added 1-series aluminum alloys with low Al-Ti-B content includes the following steps: The molten aluminum, after being melted and filtered, is fed into the auxiliary box. Titanium wire and Al-Ti-B wire are simultaneously added to the molten aluminum in the auxiliary box, and the molten aluminum in the auxiliary box is subjected to ultrasonic treatment. Then the molten aluminum flows into the main box, and then from the main box into the casting nozzle for casting and rolling to obtain 1-series aluminum alloy casting and rolling material. The center of action of the ultrasonic treatment covers the area where the titanium wire and Al-Ti-B wire are added.
2. The method for casting and rolling Ti-added 1-series aluminum alloys with low Al-Ti-B content according to claim 1, characterized in that, The ultrasonic frequency of the sub-box is 20±2kHz, and the total ultrasonic power is ≥200W.
3. The casting and rolling method for low Al-Ti-B content 1-series aluminum alloys with added Ti according to claim 1, characterized in that, Based on the amount of molten aluminum, the amount of titanium wire added in the auxiliary box is 0.001 to 0.05% / t Al.
4. The method for casting and rolling Ti-added 1-series aluminum alloys with low Al-Ti-B content according to claim 1, characterized in that, Based on the amount of molten aluminum, the amount of Al-Ti-B wire added in the auxiliary box is 0.0001-0.05 kg / t Al.
5. The method for casting and rolling Ti-added 1-series aluminum alloys with low Al-Ti-B content according to claim 1, characterized in that, The temperature of the molten aluminum is 690-720℃.
6. The method for casting and rolling Ti-added 1-series aluminum alloys with low Al-Ti-B content according to claim 1, characterized in that, The 1-series aluminum alloys are aluminum alloys with grades 1050, 1060, 1100, 1145 or 1235.
7. The method for casting and rolling Ti-added 1-series aluminum alloys with low Al-Ti-B content according to claim 1, characterized in that, The titanium wire and Al-Ti-B wire are added to the sub-box in a region that is ≥1 / 3S away from the inner wall. l And ≥1 / 3S w S l With S w These are the length and width of the secondary housing, respectively.
8. The method for casting and rolling Ti-added 1-series aluminum alloys with low Al-Ti-B content according to claim 1, characterized in that, The sub-box includes an ultrasonic-assisted structure.
9. A 1-series aluminum alloy prepared by the preparation method according to any one of claims 1-8.