Integrated machining process for high-strength aluminum alloy mobile phone middle frame

Abstract

The invention relates to the technical field of aluminum alloy preparation, and discloses an integrated machining process of a high-strength aluminum alloy mobile phone middle frame. By arranging the continuous production line, all procedures of semi-finished products before extrusion-CNC machining are integrated and unified, and as integrated production, intermediate extra transportation actions are completely removed, so that the production efficiency is improved, the production cost is reduced, the material loss is reduced, and the resource utilization rate is improved. And meanwhile, stamping machining is carried out immediately after extrusion, strength improvement caused by natural aging can be avoided, the stamping effect is improved, CNC machining can be replaced with stamping machining, and the production efficiency is further improved. And secondly, through alloy component optimization, the strength improvement speed of the material in subsequent artificial aging is greatly improved, so that a continuous aging furnace can be integrated on a production line, and it is guaranteed that the material is subjected to rapid aging to meet the strength requirement. The rapid aging mode not only improves the production efficiency, but also ensures the quality and performance of the product.

Description

Technical Field

[0001] The invention relates to the technical field of preparation of aluminum alloy profiles, and in particular to an integrated processing technology for a high-strength aluminum alloy mobile phone middle frame. Background Art

[0002] Aluminum alloy is widely used in precision machinery manufacturing and electronic equipment manufacturing due to its advantages of light weight, high strength and easy processing, such as the manufacturing of mobile phone middle frames. As a key component, the processing accuracy and strength of the mobile phone middle frame directly affect the overall performance and service life of the mobile phone.

[0003] In the prior art, the processing of aluminum alloy mobile phone middle frames usually requires multiple processes such as extrusion, aging, sawing, surface grinding, and CNC; CNC processing is usually carried out on a whole piece of aluminum plate, and the middle needs to be hollowed out, which can realize the processing of complex shapes, but the processing efficiency is low, which will cause a lot of loss and scrap, and the processing cost is high. In the prior art, there are also mobile phone middle frame products obtained by stamping (such as the Chinese utility model patent with publication number CN206164609U), but the material strength of aluminum alloy materials is high after natural aging, and the stamping effect is poor or even impossible to stamp. In addition, in the existing aluminum alloy mobile phone middle frame production process, the aging time is long, and multiple processes are connected, such as the material flow between extrusion, aging, sawing, double-sided grinding, etc., which will lead to a lot of handling and labor cost waste. Summary of the invention

[0004] In response to the problems existing in the prior art, the purpose of the present invention is to provide an integrated processing technology for a high-strength aluminum alloy mobile phone middle frame that integrates all processes from extrusion to semi-finished products before CNC processing, thereby improving production efficiency, reducing production costs, and thereby providing at least a beneficial choice or creating conditions for solving one or more technical problems existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions.

[0006] An integrated processing technology for a high-strength aluminum alloy mobile phone middle frame product is realized by using an extruder and quenching equipment, a straightening machine, a material storage cooling bed, a punching / sawing equipment, a stamping processing equipment, a double-sided grinding equipment and a continuous aging equipment which are sequentially connected to form a continuous production line.

[0007] The specific steps are as follows: Step 1: Configure the composition of the aluminum alloy material. By weight percentage, the content of Mg element is 0.7%-0.9%, the content of Si element is 0.7%-0.9%, where Mg / Si is in the range of 1.0-1.1, the content of Cu element is 0.5%-0.7%, the total content of Mg+Si+Cu elements is in the range of 2.0%-2.4%, the content of Fe element is less than 0.15%, the content of Mn element is 0.05%-0.15%, Fe / Mn is in the range of 0.8-1.2, the content of Zn element is 0.1%-0.2%, the content of La element is 0.05%-0.15%, and the balance is Al.

[0008] Step 2: Extrusion molding. Melt and cast the aluminum alloy material composition configured in Step 1 into an aluminum rod, and then extrude to obtain an aluminum alloy profile.

[0009] Step 3: Online cooling and quenching. Perform online cooling and quenching on the extruded aluminum alloy profile.

[0010] Step 4: Straightening and stretching. The straightening and stretching amount is 1-5%.

[0011] Step 5: Sawing or punching. Cut off the head and tail waste by sawing or punching, and then perform punching or sawing to obtain the middle frame blank.

[0012] Step 6: Punching. Feed the cut middle frame blank into a punching press to punch out a structure in the shape of a Japanese character or a square character.

[0013] Step 7: Double-sided grinding. Use double-sided grinding equipment for double-sided grinding.

[0014] Step 8: Continuous aging. Feed the ground product into a continuous aging furnace for aging. The aging time is 1-3h, and the aging holding temperature is 170-190°C.

[0015] More preferably, between the extruder and the quenching equipment and the straightening machine, and between the straightening machine and the storage cooling bed, they are all conveyed by a cooling bed belt.

[0016] More preferably, between the storage cooling bed and the punching / sawing equipment, it is conveyed by a roller.

[0017] More preferably, between the punching / sawing equipment and the stamping processing equipment, between the stamping processing equipment and the double-sided grinding equipment, and between the double-sided grinding equipment and the continuous aging equipment, they are all conveyed by a manipulator or a conveyor belt.

[0018] More preferably, the continuous production line further includes an automatic packaging equipment, and the automatic packaging equipment is connected to the discharge end of the continuous aging equipment through a manipulator or a conveyor belt.

[0019] More preferably, the continuous equipment is a crawler-type multi-layer continuous aging furnace with a furnace length of 10-20 m and a crawler moving speed of 0.1-0.3 m / min in the furnace.

[0020] More preferably, in the second extrusion molding step, the extrusion temperature is 530-560° C. and the extrusion main cylinder speed is 1-4 mm / s.

[0021] More preferably, in the online cooling and quenching step of step three, the cooling rate is greater than 400°C / min.

[0022] More preferably, in step five, punching or sawing, 2-10 pieces are punched or sawed at the same time as a batch to obtain the middle frame blank.

[0023] More preferably, in step six, the punching step, a single punch press punches 2 to 10 sheets of material simultaneously.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects.

[0025] The present invention integrates all the processes of the semi-finished products before extrusion-CNC processing into an integrated production by setting up a continuous production line, completely removing the extra transportation action in the middle. This integrated production method not only improves production efficiency and reduces production costs, but also reduces material loss and improves resource utilization. At the same time, because the stamping process is performed immediately after extrusion, the improvement of strength due to natural aging can be avoided, the stamping effect can be improved, and stamping can be used instead of CNC processing, further improving production efficiency. Secondly, the present invention optimizes the alloy composition to greatly improve the strength improvement speed of the subsequent artificial aging of the material, so that the continuous aging furnace can also be integrated into the production line to ensure that the material is quickly aged to meet the strength requirements. This rapid aging method not only improves production efficiency, but also ensures the quality and performance of the product. Finally, the present invention realizes efficient and low-cost processing of aluminum alloy mobile phone middle frame profiles by optimizing the processing technology. This efficient and low-cost processing method not only meets the market demand for high-performance and high-quality aluminum alloy mobile phone middle frame profiles, but also provides new ideas and methods for the development of the field of material processing technology. In general, the present invention has broad application prospects, large market demand, and good commercial value.

[0026] Some other beneficial effects of the present invention will become more obvious from the following description or be understood in practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Shown is a schematic structural diagram of an integrated processing device for a high-strength aluminum alloy mobile phone middle frame product in the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] Reference Figure 1 As shown, an integrated processing device for a high-strength aluminum alloy mobile phone middle frame product comprises an extruder and quenching equipment 1, a straightening machine 2, a material storage cooling bed 3, a punching / sawing equipment 4, a stamping processing equipment 5, a double-sided grinding equipment 6, a continuous aging equipment 7 and an automatic packaging equipment 8 which are sequentially connected to form a continuous production line. The extruder and quenching equipment 1 and the straightening machine 2 are conveyed by a cooling bed belt, the straightening machine 2 and the material storage cooling bed 3 are conveyed by a cooling bed belt, the material storage cooling bed 3 and the punching / sawing equipment 4 are conveyed by a roller, the punching / sawing equipment 4 and the stamping processing equipment 5 are conveyed by a manipulator or a special conveyor belt; the stamping processing equipment 5 and the double-sided grinding equipment 6 are conveyed by a manipulator or a special conveyor belt, the double-sided grinding equipment 6 and the continuous aging equipment 7 are conveyed by a manipulator or a special conveyor belt, and the continuous aging equipment 7 and the automatic packaging equipment 8 are conveyed by a manipulator or a special conveyor belt.

[0030] It should be noted that the various devices constituting the above-mentioned continuous production line are conventional devices known to those skilled in the art. In addition to the connection methods exemplified above, the transition connection methods between adjacent devices may also adopt other transition connection methods that are currently known or may be realized in the future.

[0031] The following introduces an integrated processing technology for a high-strength aluminum alloy mobile phone middle frame product achieved by using the above-mentioned integrated processing device, and the specific steps are as follows.

[0032] Step 1: configure the composition of aluminum alloy materials. By weight percentage, the Mg element content is 0.7%-0.9%, the Si element content is 0.7%-0.9%, wherein Mg / Si is in the range of 1.0-1.1, the Cu element content is 0.5%-0.7%, the total content of Mg+Si+Cu elements is in the range of 2.0%-2.4%, the Fe element content is less than 0.15%, the Mn element content is 0.05%-0.15%, Fe / Mn is in the range of 0.8-1.2, the Zn element content is 0.1%-0.2%, the La element content is 0.05%-0.15%, and the balance is Al.

[0033] Step 2: Extrusion molding. The aluminum alloy material components prepared in step 1 are melted and cast into aluminum rods, and then extruded to obtain aluminum alloy profiles; the extrusion temperature is 530-560℃, and the extrusion main cylinder speed is 1-4mm / s to ensure the quality and precision of the profiles.

[0034] Step 3: Online cooling quenching. The extruded aluminum alloy profiles are subjected to online cooling quenching with a cooling rate greater than 400 °C / min to ensure the stability of the microstructure inside the material and improve the strength and hardness of the material.

[0035] Step 4: Straightening and stretching. Through straightening and stretching, ensure that the straightness of the material meets the requirements, avoid affecting stamping processing due to material bending, and at the same time increase the dislocation density inside the material through a large stretching amount to promote the rapid increase in strength during subsequent aging. The straightening and stretching amount is 1-5%.

[0036] Step 5: Sawing and punching. Cut off the head and tail waste through sawing and punching, and at the same time perform punching or sawing in batches of 2-10 pieces to obtain the middle frame blanks. The cutting length is the single-piece length required by the customer, improving production efficiency and material utilization rate.

[0037] Step 6: Punching. Automatically feed the cut middle frame blanks into a single punching press and punch 2-10 pieces of material at the same time, punching out a Japanese character or mouth character structure from the material to improve production efficiency.

[0038] Step 7: Double-sided grinding. Use double-sided grinding equipment for automatic double-sided grinding to perform surface thinning and flatness optimization, improving the accuracy and quality of the product.

[0039] Step 8: Continuous aging. Send the ground products into a track-type multi-layer continuous aging furnace through a conveyor track or manipulator for aging. The furnace length is 10-20 m, the moving speed of the material on the furnace track is 0.1-0.3 m / min, the total heating + holding time of the material in the furnace is 1-3 h, and the set holding temperature is 170-190 °C.

[0040] Step 9: Packaging. First, cool the continuously aged profiles with a blower, and then perform packaging and palletizing through an automatic manipulator after cooling.

[0041] The following illustrates the technical progressiveness of the present invention through Examples 1-4 and Comparative Examples 1-10.

[0042] Table 1. Alloy component ratios of Examples 1-4 and Comparative Examples 1-10.

[0043] Mg Si Mg / Si Cu Mg+Si+Cu Fe Mn Fe / Mn Zn La Example 1 0.75 0.72 1.04 0.65 2.12 0.09 0.10 0.90 0.12 0.08 Example 2 0.87 0.82 1.06 0.58 2.27 0.08 0.09 0.89 0.15 0.07 Example 3 0.72 0.72 1.00 0.68 2.12 0.08 0.10 0.80 0.13 0.10 Example 4 0.81 0.8 1.01 0.52 2.13 0.09 0.08 1.13 0.18 0.13 Comparative Example 1 0.64 0.62 1.03 0.62 1.88 0.09 0.1 0.90 0.16 0.11 Comparative Example 2 0.81 0.8 1.01 0.52 2.13 0.09 0.08 1.13 0.18 0.13 Comparative Example 3 0.81 0.8 1.01 0.52 2.13 0.09 0.08 1.13 0.18 0.13 Comparative Example 4 0.75 0.73 1.03 0.25 1.73 0.08 0.08 1.00 0.14 0.09 Comparative Example 5 0.85 0.77 1.10 0.67 2.29 0.08 0.09 0.89 0.18 0.00 Comparative Example 6 0.82 0.78 1.05 0.65 2.25 0.08 0.09 0.89 0.02 0.13 Comparative Example 7 0.79 0.75 1.05 0.55 2.09 0.07 0.08 0.88 0.02 0.00 Comparative Example 8 0.79 0.75 1.05 0.55 2.09 0.07 0.08 0.88 0.02 0.00 Comparative Example 9 0.79 0.75 1.05 0.55 2.09 0.07 0.08 0.88 0.02 0.00 Comparative Example 10 0.79 0.75 1.05 0.55 2.09 0.07 0.08 0.88 0.02 0.00 。

[0044] Table 2. Process parameters and product properties of Examples 1-4 and Comparative Examples 1-10.

[0045] Straightening amount% Aging temperature ℃ Aging time h Tensile strengthMpa Yield StrengthMpa Elongation% Example 1 3.5 175 2.5 383 365 9.8 Example 2 3.2 185 1.5 384 361 9.2 Example 3 4.1 180 2 381 364 9.6 Example 4 3.8 180 2 385 367 9.4 Comparative Example 1 4.1 180 2 372 349 10.7 Comparative Example 2 0.8 180 2 382 348 11.2 Comparative Example 3 3.8 160 3 379 337 12.5 Comparative Example 4 2.9 180 2 375 352 11.1 Comparative Example 5 3.7 180 2 387 348 8.7 Comparative Example 6 3.9 180 2 385 345 12.3 Comparative Example 7 3.7 180 2 382 335 11.8 Comparative Example 8 0.5 180 2 378 328 12.5 Comparative Example 9 0.5 180 5 381 357 10.2 Comparative Example 10 0.5 180 8 384 369 8.9 。

[0046] Except for the differences listed in Table 1 and Table 2, other process parameters are default the same.

[0047] It can be seen from Table 1 and Table 2 that under the alloy formula and process conditions of the present invention, the product can take into account tensile strength, yield strength and elongation. When the content of Mg, Si, and Mg+Si+Cu is lower than the lower limit of the present invention, the tensile strength and yield strength of the product will be significantly reduced (Comparative Example 1); when the straightening amount is lower than the lower limit, the yield strength of the product will be significantly reduced (Comparative Example 2); when the aging temperature is lower than the lower limit, the yield strength of the product will be significantly reduced (Comparative Example 3); when the content of Cu, Mg+Si+Cu is lower than the lower limit of the present invention, the yield strength of the product will be significantly reduced (Comparative Example 4); when the La content is lower than the lower limit of the present invention, the yield strength and elongation of the product are significantly reduced (Comparative Example 5); when the Zn content or the content of Zn and La is lower than the lower limit of the present invention, the yield strength of the product is significantly reduced (Comparative Examples 6-8); when the content of Zn and La, and the straightening amount are lower than the lower limit of the present invention, even if the artificial aging time is extended, the technical effect of the present invention cannot be achieved (Comparative Example 9, Comparative Example 10).

[0048] It can be seen that the present invention can realize the integrated processing of high-strength aluminum alloy mobile phone middle frame products, and effectively solves the problems of high material loss rate, low processing efficiency, and poor stamping effect in traditional processes.

[0049] It should be noted that the technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The above embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. The parts not described in the specific embodiments are all prior art or common knowledge.

[0051] It should be noted that, in the description of the present invention, the content of the present invention can be more easily understood by referring to the detailed description of the preferred implementation method of the present invention and the embodiments included. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those of ordinary skill in the art to which the present invention belongs. When there is a conflict, the definitions in this specification shall prevail.

[0052] In the present invention, the term "prepared from..." is used synonymously with "comprising". The terms "comprising", "including", "having", "containing" or any other variation thereof, as used in the present invention, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus comprising the listed elements is not necessarily limited to only those elements, but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0053] In the present invention, when an amount, concentration, or other value or parameter is expressed as a range, a preferred range, or a range limited by a series of upper preferred values ​​and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is disclosed separately. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted as including a range of "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5" etc. When a numerical range is described in the present invention, unless otherwise stated, the range is intended to include its end values ​​and all integers and fractions within the range.

[0054] In addition, the indefinite articles "a" and "an" before the elements or components of the present invention have no restrictions on the quantity requirements (i.e. the number of occurrences) of the elements or components. Therefore, "a" or "an" should be interpreted as including one or at least one, and the elements or components in the singular form also include the plural form, unless the number is obviously intended to be in the singular form.

Claims

1. An integrated processing technology for high-strength aluminum alloy mobile phone middle frame products, characterized in that: It is realized by using an extruder, a quenching device, a straightening machine, a storage cooling bed, a punching / sawing device, a stamping processing device, a double-sided grinding device and a continuous aging device which are connected in sequence to form a continuous production line. The specific steps are as follows: Step 1: Configure the composition of the aluminum alloy material. By weight percentage, the content of Mg element is 0.7%-0.9%, the content of Si element is 0.7%-0.9%, where Mg / Si is in the range of 1.0-1.1, the content of Cu element is 0.5%-0.7%, the total content of Mg+Si+Cu elements is in the range of 2.0%-2.4%, the content of Fe element is less than 0.15%, the content of Mn element is 0.05%-0.15%, Fe / Mn is in the range of 0.8-1.2, the content of Zn element is 0.1%-0.2%, the content of La element is 0.05%-0.15%, and the balance is Al. Step 2: Extrusion molding. The aluminum alloy material composition configured in Step 1 is melted and cast into an aluminum rod, and then extruded to obtain an aluminum alloy profile. Step 3: Online cooling and quenching. The extruded aluminum alloy profile is subjected to online cooling and quenching. Step 4: Straightening and stretching. The straightening and stretching amount is 1-5%. Step 5: Sawing or punching. The head and tail waste materials are removed by sawing or punching, and then the middle frame blank is obtained by punching or sawing. Step 6: Punching. The cut middle frame blank is sent to a punching press for punching to punch out a structure in the shape of a Japanese character or a square character. Step 7: Double-sided grinding. Double-sided grinding is carried out using a double-sided grinding device. Step 8: Continuous aging. The ground product is sent into a continuous aging furnace for aging. The aging time is 1-3h, and the aging holding temperature is 170-190°C.

2. The integrated processing technology of a high-strength aluminum alloy mobile phone middle frame product according to claim 1 is characterized in that: Between the extruder and the quenching device and the straightening machine, and between the straightening machine and the storage cooling bed, they are all conveyed by a cooling bed belt.

3. The integrated processing technology of a high-strength aluminum alloy mobile phone middle frame product according to claim 1 is characterized in that: Between the storage cooling bed and the punching / sawing device, it is conveyed by a roller.

4. The integrated processing technology of a high-strength aluminum alloy mobile phone middle frame product according to claim 1 is characterized in that: Between the punching / sawing device and the stamping processing device, between the stamping processing device and the double-sided grinding device, and between the double-sided grinding device and the continuous aging device, they are all conveyed by a manipulator or a conveyor belt.

5. The integrated processing technology of a high-strength aluminum alloy mobile phone middle frame product according to claim 1 is characterized in that: The continuous production line further includes an automatic packaging device, and the automatic packaging device is connected to the discharge end of the continuous aging device through a manipulator or a conveyor belt.

6. The integrated processing technology of a high-strength aluminum alloy mobile phone middle frame product according to claim 1, characterized in that: The continuous device is a crawler-type multi-layer continuous aging furnace, the furnace length is 10-20m, and the moving speed of the crawler in the furnace is 0.1-0.3m / min.

7. The integrated processing technology of a high-strength aluminum alloy mobile phone middle frame product according to claim 1, characterized in that: In the extrusion molding step of Step 2, the extrusion temperature is 530-560°C, and the extrusion main cylinder speed is 1-4mm / s.

8. The integrated processing technology of a high-strength aluminum alloy mobile phone middle frame product according to claim 1, characterized in that: In the online cooling and quenching step of Step 3, the cooling speed is greater than 400°C / min.

9. The integrated processing technology of a high-strength aluminum alloy mobile phone middle frame product according to claim 1, characterized in that: In the punching or sawing step of Step 5, 2-10 pieces are simultaneously punched or sawed in batches to obtain the middle frame blank.

10. The integrated processing technology of a high-strength aluminum alloy mobile phone middle frame product according to claim 1, characterized in that: In the punching step of Step 6, 2-10 pieces of materials are simultaneously punched by a single punching press.

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