A die-casting process for an ADC12 aluminum alloy information processing box

Abstract

The present invention provides a die-casting process method for an ADC12 aluminum alloy information processing box body, belonging to the technical field of die-casting process design. The method first places an aluminum alloy material into a medium-frequency induction melting furnace and heats it to 680-700°C to obtain a clear melt; the clear melt is refined, slag-removed, and slag-removed, and the furnace body is stationary to obtain an aluminum alloy melt; then the die-casting machine is debugged, and after the mold is closed, the mold is preheated using a mold temperature controller; the aluminum alloy melt is then poured into a die-casting mold and formed according to the die-casting mold style; finally, the die-casting machine is maintained at 660°C and a pressure of 80-90 MPa for 3-8 seconds; 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 removed to obtain an aluminum alloy information processing box body casting. The present invention obtains an aluminum alloy signal box body casting with a complete shape and structure, a smooth surface, and no obvious cracks, looseness, inclusions and other defects. After the casting is solution treated at 460°C / 0.5h, the plasticity is greatly improved while the strength is guaranteed.

Description

Technical Field

[0001] The present 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 its alloys offer advantages such as low density, high specific strength and stiffness, as well as excellent plasticity, formability, weldability, and corrosion resistance. They are widely used in transportation, mechanical electronics, aerospace, and other fields, and have become an important foundational material for industrial manufacturing. With the rapid advancement of material properties and manufacturing technologies, the application of thin-walled aluminum alloy parts is also becoming increasingly widespread. Die casting, a metal forming method characterized by high pressure and high speed, enables the continuous, large-scale production of precision castings with varying thicknesses and complex shapes.

[0003] Information processing (IP) 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 the 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 problem that defects are easily generated during die-casting of an aluminum alloy information processing box, 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] To address the aforementioned technical issues in the prior art, the present invention provides a die-casting process for an ADC12 aluminum alloy information processing box body, thereby avoiding defects in aluminum alloy information processing box body structures caused by large variations in wall thickness and small dimensional tolerances, which can affect the structural integrity and mechanical properties of the casting. The technical solution is as follows:

[0006] A die-casting process 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 and 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 stopped 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 closing the mold, 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 formed according to the style of the die-casting mold;

[0015] S5, heat preservation and pressure maintenance:

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

[0017] S6, mold separation:

[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 box body 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 step S1, nitrogen is filled into the smelting process to ensure a nitrogen atmosphere, thereby removing oxygen and preventing oxidation.

[0021] In step S1, the mass ratio of the aluminum alloy material to the refining agent and the slag remover is 222:1:1, wherein the refining is carried out in two steps, the refining agent used in the first refining is 55% of the total amount of the refining agent, and the slag remover used in the first refining is 55% of the total amount of the slag remover; the balance is used in the second refining;

[0022] The melt is heated to 680-700°C and kept warm for 5 minutes, followed by the first refining. After adding the refining agent for 2 minutes, the slag remover is added, and the second refining is carried out after 3 minutes.

[0023] During the second refining, the refining agent is added 1 minute later, and the slag remover is added 1 minute later.

[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 and 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 ingates, 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 structure products have large differences in wall thickness and small dimensional tolerances, which easily cause poor filling of aluminum liquid during die casting, resulting in poor welding of aluminum alloy, and the resulting castings are prone to defects such as cold shut, shrinkage and shrinkage cavities, 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 removes the aluminum alloy information processing box casting by demolding, thereby avoiding the defects of aluminum alloy information processing box structure products caused by large differences in wall thickness and small dimensional tolerances, improving the mechanical properties of the aluminum alloy information processing box casting, and obtaining an aluminum alloy information processing box casting with a complete shape structure, a smooth surface, and no obvious cracks, looseness, inclusions and other defects, and after the casting is solution treated at 460°C / 0.5h, the plasticity is greatly improved while ensuring the strength.

[0031] Compared with the current process of machining deformed aluminum alloy to obtain the box body, which is complicated, costly and inefficient, the pressure casting of the present invention can continuously and in large quantities produce precision castings with uneven thickness and complex shapes. 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 for an ADC12 aluminum alloy information processing box body provided by an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of fluidity analysis in simulation according to an embodiment of the present invention;

[0035] Figure 3Schematic diagram of temperature distribution in 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 as-cast sample and the solid solution sample according to an embodiment of the present invention, wherein (a) is the as-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 an "exemplary" in the present invention should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of the word "exemplary" is intended to present concepts in a concrete manner. Furthermore, in the embodiments of the present invention, "and / or" can mean both or either of the two.

[0040] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, 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 for 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 and 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 stopped 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 closing the mold, 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 formed according to the style of the die-casting mold;

[0050] S5, heat preservation and pressure maintenance:

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

[0052] S6, mold separation:

[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 box body casting.

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

[0055] As shown in Tables 1 and 2, an analysis of the nine orthogonal experiments and their range results indicates that, among the three influencing factors selected, pouring temperature has the greatest impact on casting quality in the die-casting process, while mold preheating temperature and injection speed have relatively minor influences, with injection speed having the lowest impact. Combined with the range analysis, the A2B2C2 solution is the optimal die-casting process. The optimal die-casting process parameters are determined to be: pouring temperature of 660°C, mold preheating temperature of 220°C, and injection speed of 3 m / s.

[0056] Table 1 Factor levels of orthogonal experimental design

[0057]

[0058] Table 2 Orthogonal test and range results

[0059]

[0060] 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 and no obvious cracks, looseness, inclusions and other defects. Figure 5 ,Analysis of the mechanical properties of the as-cast and solid solution samples, it can be seen that ,after the 460 ℃ / 0.5 h solid solution treatment, the plasticity of the solid solution sample is ,greatly improved while the strength is maintained.

[0061] In the embodiment of the present invention, an aluminum alloy melt is prepared by smelting, a die-casting mold is preheated, and then the optimal die-casting process parameters are obtained through orthogonal experimental design. The die-casting mold is kept warm and under pressure, and finally the mold is separated and the aluminum alloy contact box body casting is taken out. The 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 for 0.5 h, the plasticity is greatly improved while the strength is guaranteed.

[0062] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A die-casting process for an ADC12 aluminum alloy information processing box body, characterized in that: The method comprises: S1. Melting: The aluminum alloy material is placed in a medium frequency induction melting furnace and heated to 680-700°C to obtain a molten aluminum alloy; the molten aluminum alloy is refined, slag removed, and slag removed, and the furnace body is allowed to stand 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 closing the mold, 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 formed according to the style of the die-casting mold; S5, heat preservation and pressure maintenance: The die casting machine is set to the pouring temperature in step S4 and maintained at a pressure of 80-90 MPa for 3-8 seconds; S6, mold separation: 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 box casting; 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; In step S1, the mass ratio of the aluminum alloy material to the refining agent and the slag remover is 222:1:1, wherein the refining is carried out in two steps, the refining agent used in the first refining is 55% of the total amount of the refining agent, the slag remover used is 55% of the total amount of the slag remover, and the balance is used in the second refining; The melt is heated to 680-700°C, kept warm for 5 minutes, and then the first refining is carried out. After adding the refining agent for 2 minutes, the slag remover is added, and the slag is removed after 2 minutes. After 3 minutes, the second refining is carried out. In the second refining, add the refining agent 1 minute later and then add the slag remover, and remove the slag after 1 minute; 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; In step S6, the obtained aluminum alloy housing casting is subjected to a solution treatment at 460° C. for 0.5 h.

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

3. The die-casting process of the ADC12 aluminum alloy information processing box 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.

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

5. The die-casting process of the ADC12 aluminum alloy information processing box 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 ingates, and the die-casting material is filled from bottom to top.

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