CN109743425B - High-efficient radiating cell-phone center - Google Patents
High-efficient radiating cell-phone center Download PDFInfo
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- CN109743425B CN109743425B CN201910044262.0A CN201910044262A CN109743425B CN 109743425 B CN109743425 B CN 109743425B CN 201910044262 A CN201910044262 A CN 201910044262A CN 109743425 B CN109743425 B CN 109743425B
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- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 200
- 230000017525 heat dissipation Effects 0.000 claims abstract description 60
- 239000010949 copper Substances 0.000 claims abstract description 55
- 229910052802 copper Inorganic materials 0.000 claims abstract description 54
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 53
- 239000000956 alloy Substances 0.000 claims description 67
- 238000005242 forging Methods 0.000 claims description 50
- 238000003825 pressing Methods 0.000 claims description 47
- 229910045601 alloy Inorganic materials 0.000 claims description 33
- 239000002994 raw material Substances 0.000 claims description 33
- 238000003466 welding Methods 0.000 claims description 32
- 238000003723 Smelting Methods 0.000 claims description 22
- 230000032683 aging Effects 0.000 claims description 22
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 20
- 238000005406 washing Methods 0.000 claims description 20
- 238000004140 cleaning Methods 0.000 claims description 19
- 238000012545 processing Methods 0.000 claims description 17
- 238000010791 quenching Methods 0.000 claims description 15
- 230000000171 quenching effect Effects 0.000 claims description 15
- 229910052782 aluminium Inorganic materials 0.000 claims description 11
- 238000007670 refining Methods 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- 238000007872 degassing Methods 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 3
- 238000009413 insulation Methods 0.000 claims 1
- 238000004512 die casting Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000000465 moulding Methods 0.000 abstract 1
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- 239000000243 solution Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000010030 laminating Methods 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 229910018563 CuAl2 Inorganic materials 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
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- 238000007429 general method Methods 0.000 description 1
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Abstract
本发明涉及手机中框技术领域，具体涉及一种高效散热的手机中框，包含中板和铝合金边框，所述中板包括由上至下依次压合的第一铝合金层、纯铜层和第二铝合金层，所述中板设置于所述铝合金边框内部。本发明中所述中板采用依次压合的铝合金层、铜层和铝合金层三层结构状，可以使中板的导热系数高达380‑420W/(m.K)，通过中间铜层将铝合金层收集的热量输送到边框，进而有利于手机内部CPU产生热量的散失，同时本发明的中框压铸效率高、成型好、可制造结构复杂件、成本低等优点。
The present invention relates to the technical field of mobile phone middle frames, and specifically to a mobile phone middle frame with high heat dissipation efficiency, comprising a middle plate and an aluminum alloy frame, wherein the middle plate comprises a first aluminum alloy layer, a pure copper layer, and a second aluminum alloy layer laminated sequentially from top to bottom, and the middle plate is arranged inside the aluminum alloy frame. The middle plate described in the present invention adopts a three-layer structure of an aluminum alloy layer, a copper layer, and an aluminum alloy layer laminated sequentially, so that the thermal conductivity of the middle plate can be as high as 380-420W/(mK), and the heat collected by the aluminum alloy layer is transferred to the frame through the middle copper layer, which is beneficial to the dissipation of heat generated by the CPU inside the mobile phone. At the same time, the middle frame of the present invention has the advantages of high die-casting efficiency, good molding, the ability to manufacture complex structural parts, and low cost.
Description
Technical Field
The invention relates to the technical field of mobile phone middle frames, in particular to a mobile phone middle frame capable of efficiently dissipating heat.
Background
The popularization of the mobile phone brings great changes to the life of people, particularly smart phones, the smart phones can generate heat seriously in the long-time use process, and experimental tests show that when the mobile phone works, the CPU and the battery part generate heat most seriously, and the main reason for the heat generation is as follows: the CPU heats up when running, and in addition, when the mobile phone is charged, a power supply loop works when running with a resistor, and the mutual game of the resistor and the current on the battery and the internal PCB mainboard is mainly embodied. The metal middle frame and the shell used on the mobile phone not only have exquisite appearance, but also have the characteristics of wear resistance, drop resistance and corrosion resistance, wherein the rear cover is used as an important part of the mobile phone, the appearance is smooth, and the inner side structure is complex. The current general method of the rear cover of the mobile phone is as follows: die casting (or forging) -CNC-appearance processing-back cover. The frame of cell-phone shell among the prior art includes that the medium plate all still has had certain not enough, if whole radiating effect is relatively poor, in use can not be fine derive the heat that receives on the medium plate and dispel the heat, has leaded to whole radiating effect relatively poor, therefore does not have a scheme that can improve cell-phone heat dispersion.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention aims to provide the mobile phone middle frame capable of efficiently dissipating heat.
The purpose of the invention is realized by the following technical scheme: the utility model provides a radiating cell-phone center of high efficiency, contains medium plate and aluminum alloy frame, the medium plate is including first aluminum alloy layer, pure copper layer and the second aluminum alloy layer of pressfitting from top to bottom in proper order, the medium plate set up in inside the aluminum alloy frame, further the copper layer is pure copper, and further, the coefficient of heat conductivity of medium plate 2 is 380-420W/(m.K).
The middle plate manufactured by the invention adopts a three-layer structure of the first aluminum alloy layer, the copper layer and the second aluminum alloy layer which are sequentially pressed, so that the high heat conductivity of the middle plate can be enhanced, and the heat collected by the aluminum alloy layers is transmitted to the frame through the middle copper layer, thereby being beneficial to the dissipation of the heat generated by a CPU in the mobile phone.
Preferably, the first aluminum alloy layer and the second aluminum alloy layer are both made of alloy materials, and the alloy materials comprise the following raw materials in percentage by weight:
the balance being Al and unavoidable impurities.
The aluminum alloy material is prepared from the raw materials, so that the prepared aluminum alloy has excellent strength and hardness, excellent heat-conducting property, toughness and welding property and high dimensional stability, wherein Ti and Al can form TiAl2The phase becomes a non-spontaneous core during crystallization and plays a role in refining a casting structure and a welding line structure, and the addition of a proper amount of Ti can effectively improve the strength, the high-temperature creep resistance and the corrosion resistance of the aluminum alloy, but the added Ti has a certain influence on the ductility of the aluminum alloy, so that the addition of Ti is properThe amount of Cu enhances the ductility of the aluminum alloy, thereby forming a strengthening phase CuAl2When the aluminum alloy is dissolved in the aluminum alloy, the strength and the hardness of the aluminum alloy are improved; in addition, the proportion of Si, Mg, Cu and other components in the aluminum alloy is designed and adjusted, elements such as Zr, Sr, Sc and the like are added, and the components are matched with each other, so that the microstructure of the aluminum alloy is optimized, the heat-conducting property of the aluminum alloy for the radiator is improved, and the corrosion resistance and the mechanical property of the aluminum alloy for the radiator are improved.
Preferably, the alloy materials of the first aluminum alloy layer and the second aluminum alloy layer are prepared by the following steps:
1) putting the raw materials into a smelting furnace according to the weight ratio, smelting for 3-5 hours at the temperature of 760-800 ℃ to obtain an aluminum alloy melt, fully stirring, slagging, degassing, refining, and standing the melt;
2) pouring the aluminum alloy solution prepared in the step 1) to obtain an alloy rod;
3) carrying out isothermal heat preservation on the aluminum bar obtained in the step 2) for 10-20 minutes at the temperature of 300-400 ℃, and immediately carrying out quenching treatment;
4) stretching and straightening the quenched alloy rod, wherein the stretching rate is 1.0-1.5%;
5) carrying out aging treatment on the alloy rod straightened in the step 4) at 180-200 ℃ for 5-8 hours;
6) and finally, cleaning the aluminum alloy rod subjected to the aging treatment by sequentially passing through a first washing, acetone cleaning and a second washing to obtain an aluminum alloy finished product.
The aluminum alloy of the aluminum alloy layer is prepared by the method, wherein the aluminum alloy melt obtained after smelting is cast into an alloy rod, and then quenching treatment is adopted, so that cracks and other defects of the section bar can be avoided in the quenching process, and meanwhile, the yield strength, the fatigue strength, the toughness and the hardness of the section bar can be obviously improved by reasonably setting the air flow temperature and the air cooling time in the quenching air cooling quenching process. During aging treatment, the aging temperature and the heating rate are reasonably set, so that the hardness and the heat dissipation performance of the section are further improved, and the stress in the alloy is almost completely eliminated.
Preferably, the middle plate is made of a middle plate primary product, and the preparation method of the middle plate primary product comprises the following steps:
1) pressing the first aluminum alloy layer and one side surface of the pure copper layer at the temperature of 200-260 ℃ and the pressure of 2.5-3.0 MPa;
2) and (3) pressing the second aluminum alloy layer and the other side surface of the pure copper layer pressed in the step 1) at the temperature of 220-260 ℃ and under the pressure of 2.5-3.5MPa to obtain the raw material of the middle plate.
The middle plate raw materials prepared by the process are tightly combined with each other, the strength is high, the heat dissipation effect of the internal structure of the three-layer structure is improved, meanwhile, the heat dissipation effect of the internal structure of the three-layer structure can be achieved only at the temperature of 200-260 ℃, the changes of a semi-molten state, micropores and the like can be generated on the surface of a copper layer and the surface of two aluminum alloy layers, the mutual adhesion, mutual diffusion, pressing and combination of the copper layer and the aluminum alloy layers are promoted, the stability of the layers is improved, the heat dissipation efficiency and the like are further influenced, if the pressing temperature is too high, the alloy layers are excessively molten rather, the pressing is not facilitated, and if the temperature is too low, the semi-molten state and the micropores are not reached.
Preferably, the middle plate is prepared by sequentially carrying out first-stage forging, second-stage forging, third-stage forging, two-stage CNC (computer numerical control) processing, NTM (non-volatile memory) processing, two-stage CNC processing and highlight processing on a middle plate primary product. More preferably, the middle plate primary product is placed into a die-casting die cavity and sequentially forged and pressed for 0.5 to 1 hour at the temperature of 450 to 500 ℃; the second forging at 400-440 deg.c for 0.5-1 hr; and (3) carrying out third-stage forging at the temperature of 300-350 ℃ for 0.5-1h to obtain a mobile phone middle plate blank, simply processing the blank to enable the thickness of the insert blank to be uniform, simultaneously cutting off the redundant part of the clamping position with the die-casting material fixed in the middle, then carrying out two-stage CNC (computer numerical control) processing, then carrying out NTM (non-volatile memory) processing on the inner surface of the middle plate to form injection molding nano micropores, then carrying out two-time fine milling and injection molding processing, and finally polishing the middle plate by using a high-light chamfer angle to obtain a finished product.
The middle plate manufactured by adopting the process has high strength, good anti-falling and anti-collision effects, and improved heat dissipation effect of the internal structure, wherein the CNC treatment can obviously reduce the roughness of the surface of the middle plate, thereby reducing the polishing cost.
Preferably, the total thickness of the middle frame is 0.34-0.46 mm; the thickness of the first aluminum alloy layer is 0.13-0.17mm, the thickness of the pure copper layer is 0.08-0.12mm, and the thickness of the second aluminum alloy layer is 0.13-0.17 mm.
The invention can make the middle plate have high thermal conductivity by further limiting the thickness of each layer of the middle plate, and has good interface contact due to the thin and complete contact pressure of the middle plate, so that the heat in the mobile phone is transmitted out through the middle plate.
Preferably, the middle plate is connected with the aluminum alloy frame by copper welding, and the welding mode is laser welding; and a plurality of second heat dissipation holes are formed in the joint of the middle plate corresponding to the aluminum alloy frame.
The middle plate is connected with the aluminum alloy frame by brazing, so that heat generated by a CPU in the mobile phone can be transmitted to the frame through the middle plate copper layer, heat dissipation is facilitated, in addition, the second heat dissipation holes formed in the middle plate at the connecting positions corresponding to the aluminum alloy frame can further enhance the heat dissipation effect, the heat dissipation efficiency of the middle plate is further improved, and the prepared mobile phone has good heat dissipation performance.
Preferably, the middle plate is provided with a plurality of first heat dissipation holes; the first heat dissipation hole is arranged in a horn shape and penetrates through the middle plate.
According to the invention, the first heat dissipation hole penetrating through the middle plate is arranged on the middle plate, so that the three-layer structure and the second heat dissipation hole of the middle plate can be further assisted to improve the overall heat dissipation effect of the middle plate.
The invention has the beneficial effects that: the middle plate adopts a three-layer structure of the first aluminum alloy layer, the copper layer and the second aluminum alloy layer which are sequentially pressed, so that the high heat conductivity of the middle plate can be enhanced, the heat collected by the aluminum alloy layers is transmitted to the frame through the middle copper layer, and further the dissipation of the heat generated by a CPU in the mobile phone is facilitated.
Drawings
Fig. 1 is a plan view of the present invention.
The reference signs are: 1-aluminum alloy frame, 2-middle plate, 21-first heat dissipation hole and 3-second heat dissipation hole.
Detailed Description
For the understanding of those skilled in the art, the present invention will be further described with reference to the following examples and the accompanying fig. 1, and the description of the embodiments is not intended to limit the present invention.
Example 1
The utility model provides a radiating cell-phone center of high efficiency, contains medium plate 2 and aluminum alloy frame 1, medium plate 2 by the first aluminum alloy layer 0.13mm, pure copper layer 0.08mm and the second aluminum alloy layer 0.13mm of pressfitting in proper order, medium plate 2 set up in inside aluminum alloy frame 1.
The first aluminum alloy layer and the second aluminum alloy layer are both made of alloy materials, and the alloy materials comprise the following raw materials in percentage by weight:
the balance being Al and unavoidable impurities.
The alloy materials of the first aluminum alloy layer and the second aluminum alloy layer are prepared by the following steps:
1) putting the raw materials into a smelting furnace according to the weight ratio, smelting for 3 hours at the temperature of 760 ℃ to obtain an aluminum alloy melt, fully stirring, slagging, degassing, refining, and standing the melt;
2) pouring the aluminum alloy solution prepared in the step 1) to obtain an alloy rod;
3) carrying out isothermal heat preservation on the aluminum bar obtained in the step 2) for 10 minutes at the temperature of 300 ℃, and immediately carrying out quenching treatment;
4) stretching and straightening the quenched alloy rod, wherein the stretching rate is 1.0%;
5) carrying out aging treatment on the alloy rod straightened in the step 4) at 180 ℃ for 5 hours;
6) and finally, cleaning the aluminum alloy rod subjected to the aging treatment by sequentially passing through a first washing, acetone cleaning and a second washing to obtain an aluminum alloy finished product.
The middle plate 2 is made of a middle plate primary product, and the preparation method of the middle plate primary product comprises the following steps:
1) pressing the first aluminum alloy layer and one side surface of the pure copper layer under the conditions that the temperature is 200 ℃ and the pressure is 2.5 MPa;
2) and (3) pressing the second aluminum alloy layer and the other side surface of the pure copper layer pressed in the step 1) at the temperature of 220 ℃ and the pressure of 2.5MPa to obtain the raw material of the middle plate 2.
The middle plate 2 is formed by sequentially forging and pressing a middle plate primary product at a first section at the temperature of 450 ℃ for 0.5 h; the second forging and pressing at the temperature of 400 ℃ for 0.5 h; the temperature is 300 ℃, the forging time is 0.5h, and the forging is made after two-stage CNC treatment, NTM treatment, two-stage CNC treatment and highlight treatment; the middle plate 2 is provided with a plurality of first heat dissipation holes 21 which are arranged in a horn shape and penetrate through the middle plate 2; the heat conductivity coefficient of the middle plate 2 is 380W/(m.K).
The middle plate 2 is connected with the aluminum alloy frame 1 by copper welding, and the welding mode is laser welding; and a plurality of second heat dissipation holes 3 are formed in the joint of the middle plate 2 corresponding to the aluminum alloy frame 1.
Example 2
The utility model provides a radiating cell-phone center of high efficiency, contains medium plate 2 and aluminum alloy frame 1, medium plate 2 by the first aluminum alloy layer 0.14mm, pure copper layer 0.09mm and the second aluminum alloy layer 0.14mm of pressfitting in proper order, medium plate 2 set up in inside aluminum alloy frame 1.
The first aluminum alloy layer and the second aluminum alloy layer are both made of alloy materials, and the alloy materials comprise the following raw materials in percentage by weight:
the balance being Al and unavoidable impurities.
The alloy materials of the first aluminum alloy layer and the second aluminum alloy layer are prepared by the following steps:
1) putting the raw materials into a smelting furnace according to the weight ratio, smelting for 3.5 hours at the temperature of 770 ℃ to obtain an aluminum alloy melt, fully stirring, slagging, degassing, refining, and standing the melt;
2) pouring the aluminum alloy solution prepared in the step 1) to obtain an alloy rod;
3) carrying out isothermal heat preservation on the aluminum bar obtained in the step 2) for 12 minutes at the temperature of 320 ℃, and immediately carrying out quenching treatment;
4) stretching and straightening the quenched alloy rod, wherein the stretching rate is 1.1%;
5) carrying out aging treatment on the alloy bar straightened in the step 4) at 185 ℃ for 5.5 hours;
6) and finally, cleaning the aluminum alloy rod subjected to the aging treatment by sequentially passing through a first washing, acetone cleaning and a second washing to obtain an aluminum alloy finished product.
The middle plate 2 is made of a middle plate primary product, and the preparation method of the middle plate primary product comprises the following steps:
1) pressing the first aluminum alloy layer and one side surface of the pure copper layer under the conditions that the temperature is 210 ℃ and the pressure is 2.6 MPa;
2) and (3) pressing the second aluminum alloy layer and the other side surface of the pure copper layer pressed in the step 1) at the temperature of 230 ℃ and the pressure of 2.75MPa to obtain the raw material of the middle plate 2.
The middle plate 2 is formed by sequentially forging and pressing a middle plate primary product at a first section at 460 ℃ for 0.6 h; the second forging and pressing is carried out at the temperature of 410 ℃ for 0.6 h; the temperature is 3150 ℃, the forging time is 0.6h, and the forging is made after two-stage CNC processing, NTM processing, two-stage CNC processing and highlight processing; the middle plate 2 is provided with a plurality of first heat dissipation holes 21 which are arranged in a horn shape and penetrate through the middle plate 2; the heat conductivity coefficient of the middle plate 2 is 390W/(m.K).
The middle plate 2 is connected with the aluminum alloy frame 1 by copper welding, and the welding mode is laser welding; and a plurality of second heat dissipation holes 3 are formed in the joint of the middle plate 2 corresponding to the aluminum alloy frame 1.
Example 3
The utility model provides a high-efficient radiating cell-phone center, contains medium plate 2 and aluminum alloy frame 1, medium plate 2 by the first aluminum alloy layer 0.15mm, pure copper layer 0.1mm and the second aluminum alloy layer 0.15mm of pressfitting in proper order, medium plate 2 set up in inside aluminum alloy frame 1.
The first aluminum alloy layer and the second aluminum alloy layer are both made of alloy materials, and the alloy materials comprise the following raw materials in percentage by weight:
the balance being Al and unavoidable impurities.
The alloy materials of the first aluminum alloy layer and the second aluminum alloy layer are prepared by the following steps:
1) putting the raw materials into a smelting furnace according to the weight ratio, smelting for 4 hours at the temperature of 780 ℃ to obtain an aluminum alloy melt, fully stirring, slagging, degassing, refining, and standing the melt;
2) pouring the aluminum alloy solution prepared in the step 1) to obtain an alloy rod;
3) carrying out isothermal heat preservation on the aluminum bar obtained in the step 2) for 14 minutes at the temperature of 340 ℃, and immediately carrying out quenching treatment;
4) stretching and straightening the quenched alloy rod, wherein the stretching rate is 1.3%;
5) carrying out aging treatment on the alloy rod straightened in the step 4) at 190 ℃ for 6.5 hours;
6) and finally, cleaning the aluminum alloy rod subjected to the aging treatment by sequentially passing through a first washing, acetone cleaning and a second washing to obtain an aluminum alloy finished product.
The middle plate 2 is made of a middle plate primary product, and the preparation method of the middle plate primary product comprises the following steps:
1) pressing the first aluminum alloy layer and one side surface of the pure copper layer under the conditions that the temperature is 230 ℃ and the pressure is 2.75 MPa;
2) and (3) pressing the second aluminum alloy layer and the other side surface of the pure copper layer pressed in the step 1) at the temperature of 240 ℃ and the pressure of 3.0MPa to obtain the raw material of the middle plate 2.
The middle plate 2 is formed by sequentially forging and pressing a middle plate primary product at 480 ℃ for 0.8 h; the second forging and pressing is carried out at the temperature of 420 ℃, and the forging and pressing time is 0.8 h; the temperature is 330 ℃, the forging time is 0.8h, and the forging is made after two-stage CNC treatment, NTM treatment, two-stage CNC treatment and highlight treatment; the middle plate 2 is provided with a plurality of first heat dissipation holes 21 which are arranged in a horn shape and penetrate through the middle plate 2; the heat conductivity coefficient of the middle plate 2 is 400W/(m.K).
The middle plate 2 is connected with the aluminum alloy frame 1 by copper welding, and the welding mode is laser welding; and a plurality of second heat dissipation holes 3 are formed in the joint of the middle plate 2 corresponding to the aluminum alloy frame 1.
Example 4
The utility model provides a radiating cell-phone center of high efficiency, contains medium plate 2 and aluminum alloy frame 1, medium plate 2 by the first aluminum alloy layer 0.16mm, pure copper layer 0.11mm and the second aluminum alloy layer 0.16mm of pressfitting in proper order, medium plate 2 set up in inside aluminum alloy frame 1.
The first aluminum alloy layer and the second aluminum alloy layer are both made of alloy materials, and the alloy materials comprise the following raw materials in percentage by weight:
the balance being Al and unavoidable impurities.
The alloy materials of the first aluminum alloy layer and the second aluminum alloy layer are prepared by the following steps:
1) putting the raw materials into a smelting furnace according to the weight ratio, smelting for 4.5 hours at the temperature of 790 ℃ to obtain an aluminum alloy melt, fully stirring, slagging, degassing, refining and standing the melt;
2) pouring the aluminum alloy solution prepared in the step 1) to obtain an alloy rod;
3) carrying out isothermal heat preservation on the aluminum bar obtained in the step 2) for 17 minutes at the temperature of 370 ℃, and immediately carrying out quenching treatment;
4) stretching and straightening the quenched alloy rod, wherein the stretching rate is 1.4%;
5) carrying out aging treatment on the alloy rod straightened in the step 4) at 195 ℃ for 7.5 hours;
6) and finally, cleaning the aluminum alloy rod subjected to the aging treatment by sequentially passing through a first washing, acetone cleaning and a second washing to obtain an aluminum alloy finished product.
The middle plate 2 is made of a middle plate primary product, and the preparation method of the middle plate primary product comprises the following steps:
1) pressing the first aluminum alloy layer and one side surface of the pure copper layer under the conditions that the temperature is 240 ℃ and the pressure is 2.9 MPa;
2) and (3) pressing the second aluminum alloy layer and the other side surface of the pure copper layer pressed in the step 1) at the temperature of 250 ℃ and the pressure of 3.25MPa to obtain the raw material of the middle plate 2.
The middle plate 2 is formed by sequentially forging and pressing a middle plate primary product through a primary product at 490 ℃ for 0.9 h; the second forging and pressing is carried out at the temperature of 430 ℃ for 0.9 h; the temperature is 340 ℃, the forging time is 0.9h, and the forging is prepared by two-stage CNC treatment, NTM treatment, two-stage CNC treatment and highlight treatment; the middle plate 2 is provided with a plurality of first heat dissipation holes 21 which are arranged in a horn shape and penetrate through the middle plate 2; the heat conductivity coefficient of the middle plate 2 is 410W/(m.K).
The middle plate 2 is connected with the aluminum alloy frame 1 through copper welding, and the welding mode is laser welding, and a plurality of second heat dissipation holes 3 are formed in the connecting position, corresponding to the aluminum alloy frame 1, of the middle plate 2.
Example 5
The utility model provides a radiating cell-phone center of high efficiency, contains medium plate 2 and aluminum alloy frame 1, medium plate 2 by the first aluminum alloy layer 0.17mm, pure copper layer 0.12mm and the second aluminum alloy layer 0.17mm of pressfitting in proper order, medium plate 2 set up in inside aluminum alloy frame 1.
The first aluminum alloy layer and the second aluminum alloy layer are both made of alloy materials, and the alloy materials comprise the following raw materials in percentage by weight:
the balance being Al and unavoidable impurities.
The alloy materials of the first aluminum alloy layer and the second aluminum alloy layer are prepared by the following steps:
1) putting the raw materials into a smelting furnace according to the weight ratio, smelting for 5 hours at the temperature of 800 ℃ to obtain an aluminum alloy melt, fully stirring, slagging, degassing, refining, and standing the melt;
2) pouring the aluminum alloy solution prepared in the step 1) to obtain an alloy rod;
3) carrying out isothermal heat preservation on the aluminum bar obtained in the step 2) for 20 minutes at the temperature of 400 ℃, and immediately carrying out quenching treatment;
4) stretching and straightening the quenched alloy rod, wherein the stretching rate is 1.5%;
5) carrying out aging treatment on the alloy rod straightened in the step 4) at 200 ℃ for 8 hours;
6) and finally, cleaning the aluminum alloy rod subjected to the aging treatment by sequentially passing through a first washing, acetone cleaning and a second washing to obtain an aluminum alloy finished product.
The middle plate 2 is made of a middle plate primary product, and the preparation method of the middle plate primary product comprises the following steps:
1) pressing the first aluminum alloy layer and one side surface of the pure copper layer under the conditions that the temperature is 260 ℃ and the pressure is 3.0 MPa;
2) and (3) pressing the second aluminum alloy layer and the other side surface of the pure copper layer pressed in the step 1) at the temperature of 260 ℃ and the pressure of 3.5MPa to obtain the raw material of the middle plate 2.
The middle plate 2 is formed by sequentially forging and pressing a middle plate primary product at a first section at the temperature of 500 ℃ for 1 h; the second forging and pressing is carried out at the temperature of 440 ℃, and the forging and pressing time is 1 h; the temperature is 350 ℃, the forging and pressing time is 1h, and the forging and pressing process is made after two sections of CNC treatment, NTM treatment, two sections of CNC treatment and highlight treatment; the middle plate 2 is provided with a plurality of first heat dissipation holes 21 which are arranged in a horn shape and penetrate through the middle plate 2; the heat conductivity coefficient of the middle plate 2 is 420W/(m.K).
The middle plate 2 is connected with the aluminum alloy frame 1 through copper welding, and the welding mode is laser welding, and a plurality of second heat dissipation holes 3 are formed in the connecting position, corresponding to the aluminum alloy frame 1, of the middle plate 2.
Comparative example 1
The utility model provides a radiating cell-phone center of high efficiency, contains medium plate 2 and aluminum alloy frame 1, medium plate 2 by the first aluminum alloy layer 0.13mm, SUS 0.08mm and the second aluminum alloy layer 0.13mm of pressfitting in proper order, medium plate 2 set up in inside aluminum alloy frame 1.
The first aluminum alloy layer and the second aluminum alloy layer are both made of alloy materials, and the alloy materials comprise the following raw materials in percentage by weight:
the balance being Al and unavoidable impurities.
The alloy materials of the first aluminum alloy layer and the second aluminum alloy layer are prepared by the following steps:
1) putting the raw materials into a smelting furnace according to the weight ratio, smelting for 3 hours at the temperature of 760 ℃ to obtain an aluminum alloy melt, fully stirring, slagging, degassing, refining, and standing the melt;
2) pouring the aluminum alloy solution prepared in the step 1) to obtain an alloy rod;
3) carrying out isothermal heat preservation on the aluminum bar obtained in the step 2) for 10 minutes at the temperature of 300 ℃, and immediately carrying out quenching treatment;
4) stretching and straightening the quenched alloy rod, wherein the stretching rate is 1.0%;
5) carrying out aging treatment on the alloy rod straightened in the step 4) at 180 ℃ for 5 hours;
6) and finally, cleaning the aluminum alloy rod subjected to the aging treatment by sequentially passing through a first washing, acetone cleaning and a second washing to obtain an aluminum alloy finished product.
The middle plate 2 is made of a middle plate primary product, and the preparation method of the middle plate primary product comprises the following steps:
1) pressing one side surfaces of the first aluminum alloy layer and the SUS layer at the temperature of 200 ℃ and the pressure of 2.5 MPa;
2) and (3) pressing the second aluminum alloy layer and the other side surface of the SUS layer pressed in the step 1) at the temperature of 220 ℃ and the pressure of 2.5MPa to prepare a raw material of the middle plate 2.
The middle plate 2 is formed by sequentially forging and pressing a middle plate primary product at a first section at the temperature of 450 ℃ for 0.5 h; the second forging and pressing at the temperature of 400 ℃ for 0.5 h; the temperature is 300 ℃, the forging time is 0.5h, and the forging is made after two-stage CNC treatment, NTM treatment, two-stage CNC treatment and highlight treatment; the middle plate 2 is provided with a plurality of first heat dissipation holes 21 which are arranged in a horn shape and penetrate through the middle plate 2; the heat conductivity coefficient of the middle plate 2 is 380W/(m.K).
The middle plate 2 is connected with the aluminum alloy frame 1 through copper welding, and the welding mode is laser welding, and a plurality of second heat dissipation holes 3 are formed in the connecting position, corresponding to the aluminum alloy frame 1, of the middle plate 2.
Comparative example 2
The utility model provides a radiating cell-phone center of high efficiency, contains medium plate 2 and aluminum alloy frame 1, medium plate 2 by the 0.15mm of aluminum alloy layer and the 0.1mm of pure copper layer of pressfitting in proper order, medium plate 2 set up in inside aluminum alloy frame 1.
The aluminum alloy layer is made of alloy materials, and the alloy materials comprise the following raw materials in percentage by weight:
the balance being Al and unavoidable impurities.
The alloy material of the aluminum alloy layer is prepared by the following steps:
1) putting the raw materials into a smelting furnace according to the weight ratio, smelting for 4 hours at the temperature of 780 ℃ to obtain an aluminum alloy melt, fully stirring, slagging, degassing, refining, and standing the melt;
2) pouring the aluminum alloy solution prepared in the step 1) to obtain an alloy rod;
3) carrying out isothermal heat preservation on the aluminum bar obtained in the step 2) for 14 minutes at the temperature of 340 ℃, and immediately carrying out quenching treatment;
4) stretching and straightening the quenched alloy rod, wherein the stretching rate is 1.3%;
5) carrying out aging treatment on the alloy rod straightened in the step 4) at 190 ℃ for 6.5 hours;
6) and finally, cleaning the aluminum alloy rod subjected to the aging treatment by sequentially passing through a first washing, acetone cleaning and a second washing to obtain an aluminum alloy finished product.
The middle plate 2 is made of a middle plate primary product, and the middle plate primary product is made by pressing one side surfaces of the aluminum alloy layer and the pure copper layer at the temperature of 230 ℃ and the pressure of 2.75 MPa; the middle plate 2 is formed by sequentially forging and pressing a middle plate primary product at 480 ℃ for 0.8 h; the second forging and pressing is carried out at the temperature of 420 ℃, and the forging and pressing time is 0.8 h; the temperature is 330 ℃, the forging time is 0.8h, and the forging is made after two-stage CNC treatment, NTM treatment, two-stage CNC treatment and highlight treatment; the middle plate 2 is provided with a plurality of first heat dissipation holes 21 which are arranged in a horn shape and penetrate through the middle plate 2; the heat conductivity coefficient of the middle plate 2 is 400W/(m.K).
The middle plate 2 is connected with the aluminum alloy frame 1 through copper welding, and the welding mode is laser welding, and a plurality of second heat dissipation holes 3 are formed in the connecting position, corresponding to the aluminum alloy frame 1, of the middle plate 2.
Comparative example 3
The utility model provides a radiating cell-phone center of high efficiency, contains medium plate 2 and aluminum alloy frame 1, medium plate 2 by the first aluminum alloy layer 0.17mm, pure copper layer 0.12mm and the second aluminum alloy layer 0.17mm of pressfitting in proper order, medium plate 2 set up in inside aluminum alloy frame 1.
The first aluminum alloy layer and the second aluminum alloy layer are both made of alloy materials, and the alloy materials comprise the following raw materials in percentage by weight:
the balance being Al and unavoidable impurities.
The alloy materials of the first aluminum alloy layer and the second aluminum alloy layer are prepared by the following steps:
1) putting the raw materials into a smelting furnace according to the weight ratio, smelting for 5 hours at the temperature of 800 ℃ to obtain an aluminum alloy melt, fully stirring, slagging, degassing, refining, and standing the melt;
2) pouring the aluminum alloy solution prepared in the step 1) to obtain an alloy rod;
3) carrying out isothermal heat preservation on the aluminum bar obtained in the step 2) for 20 minutes at the temperature of 400 ℃, and immediately carrying out quenching treatment;
4) stretching and straightening the quenched alloy rod, wherein the stretching rate is 1.5%;
5) carrying out aging treatment on the alloy rod straightened in the step 4) at 200 ℃ for 8 hours;
6) and finally, cleaning the aluminum alloy rod subjected to the aging treatment by sequentially passing through a first washing, acetone cleaning and a second washing to obtain an aluminum alloy finished product.
The middle plate 2 is made of a middle plate primary product, and the preparation method of the middle plate primary product comprises the following steps:
1) pressing the first aluminum alloy layer and one side surface of the pure copper layer under the conditions that the temperature is 260 ℃ and the pressure is 3.0 MPa;
2) and (3) pressing the second aluminum alloy layer and the other side surface of the pure copper layer pressed in the step 1) at the temperature of 260 ℃ and the pressure of 3.5MPa to obtain the raw material of the middle plate 2.
The middle plate 2 is formed by sequentially forging and pressing a middle plate primary product at a first section at the temperature of 500 ℃ for 1 h; the second forging and pressing is carried out at the temperature of 440 ℃, and the forging and pressing time is 1 h; the temperature is 350 ℃, the forging and pressing time is 1h, and the forging and pressing process is made after two sections of CNC treatment, NTM treatment, two sections of CNC treatment and highlight treatment; the middle plate 2 is provided with a plurality of first heat dissipation holes 21 which are arranged in a horn shape and penetrate through the middle plate 2; the heat conductivity coefficient of the middle plate 2 is 420W/(m.K).
The middle plate 2 is connected with the aluminum alloy frame 1 through copper welding, and the welding mode is laser welding, and a plurality of second heat dissipation holes 3 are formed in the connecting position, corresponding to the aluminum alloy frame 1, of the middle plate 2.
First, mechanical property tests were performed using the middle plates described in examples 1 to 5 and comparative examples 1 to 3, and the results are shown in table 1.
TABLE 1
As can be seen from the above table, the tensile strength of the middle plate prepared in the invention is up to 352 MPa; the yield strength is up to 306 MPa; the elongation after fracture is as high as A50 mm-9%, and the heat conductivity coefficient is as high as 420W/(m.K), so that the middle plate prepared by the invention has the characteristics of high strength and good toughness.
Secondly, the heat dissipation efficiency of the mobile phones manufactured by the middle frames in the embodiments 1 to 5 and the comparative examples 1 to 3 is tested. The test method comprises the following steps: the mobile phone manufactured in the corresponding example was tested at a temperature before use and after 2 hours of continuous use (room temperature 24 ℃) using a temperature probe, and the test results are shown in table 2 below.
TABLE 2
| Examples | Before use (. degree.C.) | After 2h (. degree. C.) | Heat dissipation efficiency (%) |
| Example 1 | 24.3 | 29.1 | 81.7 |
| Example 2 | 24.6 | 29.4 | 80.4 |
| Example 3 | 24.4 | 29.5 | 79.1 |
| Example 4 | 24.2 | 29.4 | 79.0 |
| Example 5 | 24.3 | 29.5 | 78.6 |
| Comparative example 1 | 24.3 | 33.8 | 60.9 |
| Comparative example 2 | 24.4 | 43.4 | 22.1 |
| Comparative example 3 | 24.2 | 32.1 | 67.3 |
By observing the table, the heat dissipation efficiency of the mobile phone manufactured by the invention can reach about 81 percent, which shows that the middle frame of the mobile phone has good heat dissipation function and can well conduct heat dissipation on the middle plate in use.
Compared with the embodiment 1, the middle plate in the comparative example 1 is prepared by laminating a first aluminum alloy layer, SUS and a second aluminum alloy layer, the heat dissipation efficiency of the mobile phone prepared by the middle plate is tested, and analysis shows that the heat dissipation efficiency of the mobile phone is reduced to a certain extent; the middle plate prepared by laminating the first stainless steel layer, the pure copper layer and the second stainless steel layer has ultrahigh heat conduction and heat dissipation rate, and the heat dissipation of the mobile phone caused by long-time use of an internal CPU and an assembly (IC) can be obviously improved by applying the middle plate to the middle frame of the mobile phone.
Compared with the embodiment 3, the middle plate in the comparative example 2 is prepared by laminating an aluminum alloy layer and a pure copper layer, and the heat dissipation efficiency of the mobile phone prepared by the middle plate is tested, and the analysis shows that the heat dissipation efficiency of the mobile phone is remarkably reduced; the middle plate prepared by laminating the first stainless steel layer, the pure copper layer and the second stainless steel layer has ultrahigh heat conduction and heat dissipation rate, and the heat dissipation of the mobile phone caused by long-time use of an internal CPU and an assembly (IC) can be obviously improved by applying the middle plate to the middle frame of the mobile phone.
Compared with the embodiment 5, the alloy materials for preparing the first aluminum alloy layer and the second aluminum alloy layer in the comparative example 3 have the advantages that two raw materials including Si and Zr are reduced, and the heat dissipation efficiency of the mobile phone manufactured by using the alloy materials is tested, and the analysis shows that the heat dissipation efficiency of the mobile phone is reduced to a certain extent; the invention is proved that the Si and Zr are added into the raw materials for preparing the alloy materials of the first aluminum alloy layer and the second aluminum alloy, so that the prepared middle plate has ultrahigh heat conduction and heat dissipation rate, and the heat dissipation of the mobile phone caused by the CPU and the component (IC) inside the mobile phone after the middle plate is applied to the middle frame of the mobile phone can be obviously improved.
The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit of the present invention.
Claims (8)
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| CN110449722A (en) * | 2019-08-26 | 2019-11-15 | 深圳市科达利实业股份有限公司 | A kind of diffusion welding method of pack alloy |
| CN113438840A (en) * | 2021-06-08 | 2021-09-24 | 维沃移动通信有限公司 | Housing assembly, electronic device and molding method of housing assembly |
| CN113427853A (en) * | 2021-07-01 | 2021-09-24 | 东莞华尔泰装饰材料有限公司 | Aluminum-plastic composite back plate and application thereof |
| CN116867208A (en) * | 2023-07-19 | 2023-10-10 | 东莞富鼎兴精密电子科技有限公司 | High-heat-conductivity antioxidant heat-dissipating cover plate and preparation method thereof |
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| CN104968178A (en) * | 2015-06-25 | 2015-10-07 | 奥捷五金(江苏)有限公司 | Mobile product middle frame and processing technology |
| CN205829725U (en) * | 2016-06-30 | 2016-12-21 | 东莞仁海科技股份有限公司 | A mobile phone middle board |
| CN108913956A (en) * | 2018-08-14 | 2018-11-30 | 合肥工业大学 | A kind of Al-Mg-Si-Cu-Mn-Sr alloy and preparation method thereof with excellent anticorrosive performance |
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| CN104968178A (en) * | 2015-06-25 | 2015-10-07 | 奥捷五金(江苏)有限公司 | Mobile product middle frame and processing technology |
| CN205829725U (en) * | 2016-06-30 | 2016-12-21 | 东莞仁海科技股份有限公司 | A mobile phone middle board |
| CN108913956A (en) * | 2018-08-14 | 2018-11-30 | 合肥工业大学 | A kind of Al-Mg-Si-Cu-Mn-Sr alloy and preparation method thereof with excellent anticorrosive performance |
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