Die-casting process method for ADC12 aluminum alloy information processing box body

Abstract

The invention provides a die-casting process method for an ADC12 aluminum alloy information processing box body, and belongs to the technical field of die-casting process design. The method comprises the following steps: firstly, putting an aluminum alloy material into a medium-frequency induction melting furnace, and heating to 680-700 DEG C to obtain melt; carrying out refining, slag removal and slag salvaging on the melt down, and standing a furnace body to obtain an aluminum alloy melt; debugging the die-casting machine, and preheating the die by using a die temperature controller after closing the die; pouring the aluminum alloy melt into a die-casting die, and molding according to the style of the die-casting die; finally, the die-casting machine is kept for 3-8 s at the temperature of 660 DEG C and the pressure of 80-90 MPa; and after the aluminum alloy melt in the die is solidified, cooling to room temperature, separating the die-casting die, and taking out the die-casting piece to obtain the aluminum alloy letter box body casting. The aluminum alloy letter box casting which is complete in shape and structure, flat and smooth in surface and free of obvious cracks, looseness, inclusions and other defects is obtained, and after the casting is subjected to solution treatment at the temperature of 460 DEG C for 0.5 h, the plasticity is greatly improved while the strength is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of die-casting process design, in particular to a die-casting process method for an ADC12 aluminum alloy information processing box body. Background Art

[0002] Aluminum and aluminum alloys have the advantages of low density, high specific strength and specific stiffness, as well as good plasticity, formability, weldability and corrosion resistance. They are widely used in transportation, mechanical electronics, aerospace and other fields, and have become important basic materials for industrial manufacturing. With the rapid development of material properties and manufacturing technology, the application of aluminum alloy thin-walled parts is becoming more and more extensive. Die casting is a metal forming method characterized by high pressure and high speed. It can continuously mass-produce precision castings with uneven thickness and complex forms.

[0003] Information processing (IC) box structure products have large differences in wall thickness and small dimensional tolerances, which can easily cause poor filling of molten aluminum during die casting, resulting in poor welding of aluminum alloy. The resulting castings are prone to defects such as cold shut, shrinkage and shrinkage cavities, which greatly reduce the mechanical properties of the castings.

[0004] Aiming at the problems that defects easily occur during die casting of an aluminum alloy information processing box body, the present invention designs a die casting process with optimal process parameters, thereby reducing casting defects and improving casting quality. Summary of the invention

[0005] In order to solve the above technical problems existing in the prior art, the embodiment of the present invention provides a die-casting process method for ADC12 aluminum alloy information processing box body, which avoids the defects of aluminum alloy information processing box body structure products caused by large wall thickness difference and small dimensional tolerance, affecting the structural integrity and mechanical properties of the casting. The technical solution is as follows:

[0006] A die-casting process method for an ADC12 aluminum alloy information processing box body, the method comprising:

[0007] S1. Melting:

[0008] The aluminum alloy material is placed in a medium frequency induction melting furnace, heated to 680-700°C to obtain a molten aluminum; the molten aluminum is refined, slag removed, and slag removed, and the furnace body is stationary to obtain an aluminum alloy melt;

[0009] S2. Debugging:

[0010] Debug the die-casting machine, install the designed die-casting mold and connect the oil pipe on the mold, adjust the mold clamping mechanism, use a sprayer to spray the release agent onto the mold surface, and close the mold;

[0011] S3, mold preheating:

[0012] After the mold is closed, turn on the mold temperature controller and use it to preheat the mold;

[0013] S4. Pouring:

[0014] The aluminum alloy melt obtained in step S1 is poured into the die-casting mold preheated in step S3, and molded according to the style of the die-casting mold;

[0015] S5, heat preservation and pressure maintenance:

[0016] The die casting machine is kept at the pouring temperature in step S4 and at a pressure of 80-90 MPa for 3-8 s;

[0017] S6. Parting:

[0018] After the aluminum alloy melt in the mold solidifies, it is cooled to room temperature, the die-casting mold is separated, and the die-casting is taken out to obtain an aluminum alloy die casting.

[0019] The components of the aluminum alloy material in step S1 and the mass percentage of each component are: Si 9.6~12.0%, Cu 1.5~3.5%, Mg<0.3%, Fe<1.3%, Mn<0.5%, Zn<1.0%, Ni<0.5%, Sn<0.2%, and the rest is Al.

[0020] In the step S1, nitrogen is filled into the smelting process to ensure a nitrogen atmosphere, thereby removing oxygen and avoiding oxidation.

[0021] In the step S1, the mass ratio of the aluminum alloy material to the refining agent and the slag-breaking agent is 222:1:1, wherein the refining is performed twice, the refining agent used in the first refining is 55% of the total amount of the refining agent, and the slag-breaking agent used in the first refining is 55% of the total amount of the slag-breaking agent; the balance is used in the second refining;

[0022] The molten metal is heated to 680-700°C, kept warm for 5 minutes, and then the first refining is performed. After adding the refining agent for 2 minutes, the slag removal agent is added, and the slag is removed after 2 minutes. After 3 minutes, the second refining is performed;

[0023] In the second refining, the refining agent is added 1 minute after adding the slag remover, and the slag is removed after 1 minute.

[0024] In step S2, the die-casting machine is a horizontal cold chamber die-casting machine, and the mold installed on the die-casting machine is perpendicular to the ground.

[0025] In step S3, the mold preheating temperature is 210-230°C.

[0026] In step S4, the pouring filling speed is 25-30 m / s, the pouring temperature is 660-680° C., and the injection speed is 3-5 m / s.

[0027] After the aluminum alloy melt is poured into the pressure chamber in step S4, the injection punch moves horizontally to push the aluminum alloy melt into the cavity of the die-casting mold through the runner and the inner gate, and the die-casting material is filled from bottom to top.

[0028] In step S6, the obtained aluminum alloy housing casting is subjected to a solution treatment at 460° C. for 0.5 h.

[0029] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0030] In view of the problem that information processing (IC) box body structure products have large differences in wall thickness and small dimensional tolerances, which easily cause poor aluminum liquid filling during die casting, resulting in poor aluminum alloy welding, and the resulting castings are prone to defects such as cold shut, shrinkage and shrinkage holes, the present invention prepares aluminum alloy melt by smelting, preheats the die-casting mold, and then obtains the optimal die-casting process parameters through orthogonal experimental design, and performs heat preservation and pressure holding, and finally separates the mold to take out the aluminum alloy information processing box body casting, thereby avoiding the defects of aluminum alloy information processing box body structure products caused by large differences in wall thickness and small dimensional tolerances, improving the mechanical properties of the aluminum alloy information processing box body casting, and obtaining an aluminum alloy information processing box body casting with a complete shape structure, a smooth surface, and no obvious cracks, looseness, inclusions and other defects, and after the casting is subjected to 460°C / 0.5 h solution treatment, while ensuring the strength, the plasticity is also greatly improved.

[0031] Compared with the current process of machining deformed aluminum alloy to obtain the letter box body, which has complex procedures, high costs and low efficiency, the pressure casting of the present invention can continuously mass-produce precision castings with uneven thickness and complex forms. The surface of the obtained product is flat and smooth, without obvious cracks, looseness, inclusions and other defects, and the performance meets the standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 This is a flow chart of a die-casting process method of an ADC12 aluminum alloy information processing box body provided by an embodiment of the present invention;

[0034] Figure 2 It is a schematic diagram of liquidity analysis in simulation of an embodiment of the present invention;

[0035] Figure 3A schematic diagram of temperature distribution in a simulation of an embodiment of the present invention;

[0036] Figure 4 Schematic diagram of an actual production sample of an embodiment of the present invention, wherein (a) is a top view and (b) is a bottom view;

[0037] Figure 5 Schematic diagram of the mechanical properties of the cast sample and the solid solution sample according to the embodiment of the present invention, wherein (a) is the cast state and (b) is the solid solution state. DETAILED DESCRIPTION

[0038] The technical solution of the present invention is described below in conjunction with the accompanying drawings.

[0039] In the embodiments of the present invention, words such as "exemplarily" and "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "example" in the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the word "example" is intended to present the concept in a specific way. In addition, in the embodiments of the present invention, the meaning expressed by "and / or" can be both, or it can be either of the two.

[0040] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0041] The embodiment of the present invention provides a die-casting process method of an ADC12 aluminum alloy information processing box body, such as Figure 1 As shown, the method includes:

[0042] S1. Melting:

[0043] The aluminum alloy material is placed in a medium frequency induction melting furnace, heated to 680-700°C to obtain a molten aluminum; the molten aluminum is refined, slag removed, and slag removed, and the furnace body is stationary to obtain an aluminum alloy melt;

[0044] S2. Debugging:

[0045] Debug the die-casting machine, install the designed die-casting mold and connect the oil pipe on the mold, adjust the mold clamping mechanism, use a sprayer to spray the release agent onto the mold surface, and close the mold;

[0046] S3, mold preheating:

[0047] After the mold is closed, turn on the mold temperature controller and use it to preheat the mold;

[0048] S4. Pouring:

[0049] The aluminum alloy melt obtained in step S1 is poured into the die-casting mold preheated in step S3, and molded according to the style of the die-casting mold;

[0050] S5, heat preservation and pressure maintenance:

[0051] The die casting machine is maintained at the pouring temperature in step S4 at a pressure of 80-90 MPa for 3-8 s;

[0052] S6. Parting:

[0053] After the aluminum alloy melt in the mold solidifies, it is cooled to room temperature, the die-casting mold is separated, and the die-casting is taken out to obtain an aluminum alloy die casting.

[0054] The following is an explanation of the specific implementation process.

[0055] As shown in Table 1 and Table 2, the analysis of 9 groups of orthogonal tests and extreme results shows that among the three selected influencing factors, the pouring temperature in the die casting process has the greatest impact on the quality of the casting, while the influence of the mold preheating temperature and the injection speed is relatively small, and the injection speed has the lowest impact. Combined with the analysis of the extreme results, it can be seen that the A2B2C2 scheme is the best die casting process scheme, and the best die casting process parameters are determined as follows: pouring temperature 660 ℃, mold preheating temperature 220 ℃, injection speed 3m / s.

[0056] Table 1 Factor levels of orthogonal experimental design

[0057] Table 2 Orthogonal test and range results

[0058]

[0059] like Figure 2 Under the optimal die-casting process parameters, the aluminum alloy melt of the present invention has good fluidity during the filling process of the simulation analysis. Figure 3 Under the optimal die-casting process parameters, the temperature distribution of the box casting in the simulation analysis is reasonable, and there is no obvious heat node. Figure 4 The aluminum alloy die-casting box body casting obtained under the optimal die-casting process parameters has a smooth surface without obvious cracks, looseness, inclusions and other defects. Figure 5 ,Analysis of the mechanical properties diagrams of the as-cast and solid solution samples shows that ,after the solid solution treatment at 460 ℃ / 0.5 h, the plasticity of the solid solution sample is ,greatly improved while the strength is guaranteed.

[0060] The embodiment of the present invention prepares an aluminum alloy melt by smelting, preheats the die-casting mold, then obtains the optimal die-casting process parameters through orthogonal experimental design, and performs heat preservation and pressure maintenance. Finally, the aluminum alloy contact box body casting is taken out by demolding, and an aluminum alloy contact box body casting with a complete shape and structure, a flat and smooth surface, and no obvious cracks, looseness, inclusions and other defects is obtained. After the casting is solution treated at 460°C / 0.5 h, the plasticity is greatly improved while the strength is guaranteed.

[0061] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A die-casting process for an ADC12 aluminum alloy information processing box, characterized in that: The method comprises: S1. Melting: The aluminum alloy material is placed in a medium frequency induction melting furnace, heated to 680-700°C to obtain a molten aluminum; the molten aluminum is refined, slag removed, and slag removed, and the furnace body is stationary to obtain an aluminum alloy melt; S2. Debugging: Debug the die-casting machine, install the designed die-casting mold and connect the oil pipe on the mold, adjust the mold clamping mechanism, use a sprayer to spray the release agent onto the mold surface, and close the mold; S3, mold preheating: After the mold is closed, turn on the mold temperature controller and use it to preheat the mold; S4. Pouring: The aluminum alloy melt obtained in step S1 is poured into the die-casting mold preheated in step S3, and molded according to the style of the die-casting mold; S5, heat preservation and pressure maintenance: The die casting machine is kept at the pouring temperature in step S4 and at a pressure of 80-90 MPa for 3-8 s; S6. Parting: After the aluminum alloy melt in the mold solidifies, it is cooled to room temperature, the die-casting mold is separated, and the die-casting is taken out to obtain an aluminum alloy die casting.

2. The die-casting process of the ADC12 aluminum alloy information processing box body according to claim 1, characterized in that: The components of the aluminum alloy material in step S1 and the mass percentage of each component are: Si 9.6-12.0%, Cu 1.5-3.5%, Mg<0.3%, Fe<1.3%, Mn<0.5%, Zn<1.0%, Ni<0.5%, Sn<0.2%, and the rest is Al.

3. The die-casting process of the ADC12 aluminum alloy information processing box body according to claim 1, characterized in that: In the step S1, nitrogen is filled into the smelting process to ensure a nitrogen atmosphere.

4. The die-casting process of the ADC12 aluminum alloy information processing box body according to claim 1, characterized in that: In step S1, the mass ratio of the aluminum alloy material to the refining agent and the slag-breaking agent is 222:1:1, wherein the refining is performed twice, the refining agent used in the first refining is 55% of the total amount of the refining agent, the slag-breaking agent used is 55% of the total amount of the slag-breaking agent, and the balance is used in the second refining; The molten metal is heated to 680-700°C, kept warm for 5 minutes, and then the first refining is performed. After adding the refining agent for 2 minutes, the slag removal agent is added, and the slag is removed after 2 minutes. After 3 minutes, the second refining is performed; In the second refining, the refining agent is added 1 minute after adding the slag removing agent, and the slag is removed after 1 minute.

5. The die-casting process of the ADC12 aluminum alloy information processing box body according to claim 1, characterized in that: In step S2, the die-casting machine is a horizontal cold chamber die-casting machine, and the mold installed on the die-casting machine is perpendicular to the ground.

6. The die-casting process of the ADC12 aluminum alloy information processing box body according to claim 1, characterized in that: In step S3, the mold preheating temperature is 210-230°C.

7. The die-casting process of the ADC12 aluminum alloy information processing box body according to claim 1, characterized in that: In step S4, the pouring filling speed is 25-30 m / s, the pouring temperature is 660-680° C., and the injection speed is 3-5 m / s.

8. The die-casting process of the ADC12 aluminum alloy information processing box body according to claim 1, characterized in that: After the aluminum alloy melt is poured into the pressure chamber in step S4, the injection punch moves horizontally to push the aluminum alloy melt into the cavity of the die-casting mold through the runner and the inner gate, and the die-casting material is filled from bottom to top.

9. The die-casting process of the ADC12 aluminum alloy information processing box body according to claim 1, characterized in that: In step S6, the obtained aluminum alloy housing casting is subjected to a solution treatment at 460° C. for 0.5 h.

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