CN111687589A - Manufacturing method of metal structural part and mobile terminal - Google Patents
Manufacturing method of metal structural part and mobile terminal Download PDFInfo
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- CN111687589A CN111687589A CN201910196174.2A CN201910196174A CN111687589A CN 111687589 A CN111687589 A CN 111687589A CN 201910196174 A CN201910196174 A CN 201910196174A CN 111687589 A CN111687589 A CN 111687589A
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- mold
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- metal structural
- protective film
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Abstract
The application relates to a manufacturing method of a metal structural part and a mobile terminal, wherein the manufacturing method of the metal structural part comprises the following steps: s110, cutting a metal plate to obtain a rough blank; s120, placing the rough blank in a mold, closing the mold and heating, wherein the mold comprises an upper mold and a lower mold, the upper mold comprises an inner surface, the inner surface is provided with a concave-convex texture structure, and the lower mold is provided with a vent hole; and S130, introducing gas into the mold through the vent hole, so that the rough blank is attached to the inner surface to prepare a metal substrate, and the texture structure of the inner surface is re-engraved on the surface of the metal substrate. The outer surface of the metal structural part is formed by the inner surface of the upper die, and aluminum scrap dust and the like mixed in the die can fall off under the action of gravity, so that the reject ratio of impurities on the surface of the metal structural part is reduced, the yield is improved, and the production cost is reduced; in addition, when the metal structural part is demoulded, the metal structural part naturally falls down, the texture structure on the surface of the metal structural part is prevented from being scratched, and the yield is improved.
Description
Technical Field
The application relates to the technical field of mobile terminals, in particular to a manufacturing method of a metal structural part and a mobile terminal.
Background
Aluminum alloys are more and more commonly applied to mobile phone battery covers due to the advantages of light weight, firmness, durability and the like. The surface of the aluminum alloy structural part is smooth and monotonous, and is usually formed on a lower die, and aluminum scraps, dust and the like are remained on the surface of the lower die, so that a plurality of defects exist on the surface of the aluminum alloy structural part.
Disclosure of Invention
In a first aspect of the present application, an embodiment provides a method for manufacturing a metal structural member, so as to solve the technical problems that the surface of the metal structural member is monotonous and surface defects are easily generated during lower mold forming.
A method of making a metallic structural member, comprising:
s110, cutting a metal plate to obtain a rough blank;
s120, placing the rough blank in a mold, closing the mold and heating, wherein the mold comprises an upper mold and a lower mold, the upper mold comprises an inner surface, the inner surface is provided with a concave-convex texture structure, and the lower mold is provided with a vent hole; and
s130, introducing gas into the mold through the vent hole, enabling the rough blank to be attached to the inner surface to obtain a metal substrate, and re-engraving the texture structure of the inner surface on the surface of the metal substrate.
The manufacturing method of the metal structural part comprises the steps that the mold comprises an upper mold with a texture structure on the inner surface and a lower mold with vent holes, the rough blank is placed in the mold, gas is introduced after heating, the rough blank is attached to the inner surface of the upper mold under the action of softening of the rough blank and gas pressure, and the texture structure of the inner surface is repeatedly engraved. The outer surface of the metal structural part is formed by the inner surface of the upper die, and aluminum scrap dust and the like mixed in the die can fall off under the action of gravity, so that the reject ratio of impurities on the surface of the metal structural part is reduced, the yield is improved, and the production cost is reduced; in addition, when the metal structural part is demoulded, the metal structural part naturally falls down, the texture structure on the surface of the metal structural part is prevented from being scratched, and the yield is improved.
In one embodiment, in S110, the cut blank is subjected to a surface pretreatment, and a first protective film is formed on a surface of the blank.
In one embodiment, the surface pretreatment includes anodic oxidation or micro-arc oxidation, and the first protective film has a thickness of 0.5 μm to 4 μm.
In one embodiment, in S110, the rough blank is provided with a positioning hole.
In one embodiment, in S120, the upper mold is blown clean by compressed air, the blank is fixed in the mold through the positioning hole, and the mold is heated to 520 ℃ to 580 ℃.
In one embodiment, the pressure of the gas introduced into the mold through the vent holes is 50MPa to 500MPa, and the mold closing time of the mold is controlled to be 0.5min to 3 min.
In one embodiment, the method includes step S140 of anodizing the surface of the metal substrate to form a second protective film.
In one embodiment, the second protective film is of the first color, and the thickness of the second protective film is 8-12 μm; or the second protective film is in a second color, and the thickness of the second protective film is 18-22 μm.
In one embodiment, the metal structural member is made of aluminum alloy, titanium alloy or stainless steel.
In a second aspect of the present application, an embodiment provides a mobile terminal to solve the technical problems that the surface of the metal structural member is monotonous and surface defects are easily generated during the lower mold forming.
The mobile terminal comprises the metal structural part manufactured by the manufacturing method of the metal structural part.
The mobile terminal comprises a metal structural part, wherein a mold for manufacturing the metal structural part comprises an upper mold and a lower mold, the inner surface of the upper mold is provided with a texture structure, the lower mold is provided with a vent hole, a rough blank is placed in the mold, gas is introduced after heating, the rough blank is attached to the inner surface of the upper mold under the action of softening of the rough blank and gas pressure, and the texture structure of the inner surface is repeatedly engraved. The outer surface of the metal structural part is formed by the inner surface of the upper die, and aluminum scrap dust and the like mixed in the die can fall off under the action of gravity, so that the reject ratio of impurities on the surface of the metal structural part is reduced, the yield is improved, and the production cost is reduced; in addition, when the metal structural part is demoulded, the metal structural part naturally falls down, the texture structure on the surface of the metal structural part is prevented from being scratched, and the yield is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a perspective view of a mobile terminal according to an embodiment;
FIG. 2 is a rear view of the mobile terminal shown in FIG. 1;
FIG. 3 is a cross-sectional view of the cell cover shown in FIG. 2;
FIG. 4 is a partial microscopic view of the outer surface of the cell cover shown in FIG. 3;
fig. 5 is a flowchart illustrating a manufacturing process of a battery cover according to an embodiment;
FIG. 6 is a cross-sectional view of a mold provided in accordance with an embodiment;
FIG. 7 is a schematic view of the operation of the mold shown in FIG. 6;
fig. 8 is a flowchart illustrating a manufacturing process of a battery cover according to another embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
As used herein, "terminal device" refers to a device capable of receiving and/or transmitting communication signals including, but not limited to, devices connected via any one or more of the following connections:
(1) via wireline connections, such as via Public Switched Telephone Network (PSTN), Digital Subscriber Line (DSL), Digital cable, direct cable connections;
(2) via a Wireless interface means such as a cellular network, a Wireless Local Area Network (WLAN), a digital television network such as a DVB-H network, a satellite network, an AM-FM broadcast transmitter.
A terminal device arranged to communicate over a wireless interface may be referred to as a "mobile terminal". Examples of mobile terminals include, but are not limited to, the following electronic devices:
(1) satellite or cellular telephones;
(2) personal Communications Systems (PCS) terminals that may combine cellular radiotelephones with data processing, facsimile, and data Communications capabilities;
(3) radiotelephones, pagers, internet/intranet access, Web browsers, notebooks, calendars, Personal Digital Assistants (PDAs) equipped with Global Positioning System (GPS) receivers;
(4) conventional laptop and/or palmtop receivers;
(5) conventional laptop and/or palmtop radiotelephone transceivers, and the like.
As shown in fig. 1 and 2, in one embodiment, a mobile terminal 10 is provided, and the mobile terminal 10 may be a smartphone, a computer, or a tablet. The mobile terminal 10 includes a display screen assembly 200, a metal structure, a middle frame and a circuit board, and in this application, the metal structure is described by taking a battery cover 100 as an example. It can be understood that the metal structural component can also be a middle frame, a key, a camera decorating ring, a fingerprint decorating ring and the like; in another embodiment, the metal structural member may be an integral form of a center frame and a rear cover of an integrally formed fuselage (unibody) structure. The metal structural member may be made of aluminum alloy, titanium alloy, stainless steel, or the like. The display screen assembly 200 and the battery cover 100 are respectively fixed to two sides of the middle frame, the display screen assembly 200, the middle frame and the battery cover 100 together form an external structure of the mobile terminal 10, the circuit board is located inside the mobile terminal 10, and electronic elements such as a controller, a storage unit, a power management unit, a baseband chip and the like are integrated on the circuit board. The display screen assembly 200 is used to display pictures or fonts, and the circuit board may control the operation of the mobile terminal 10.
In one embodiment, the Display panel assembly 200 uses an LCD (Liquid Crystal Display) panel for displaying information, and the LCD panel may be a TFT (Thin Film Transistor) screen or an IPS (In-Plane Switching) screen or an SLCD (split Liquid Crystal Display) screen. In another embodiment, the display panel assembly 200 employs an OLED (Organic Light-Emitting display) panel for displaying information, and the OLED panel may be an AMOLED (Active Matrix Organic Light-Emitting Diode) screen or a Super AMOLED (Super Active Matrix Organic Light-Emitting Diode) screen or a Super AMOLED Plus (Super Active Matrix Organic Light-Emitting Diode) screen. Under the control of the controller, the display screen assembly 200 can display information and can provide an operation interface for a user.
As shown in fig. 3 and 4, in one embodiment, the battery cover 100 includes a metal substrate 110. The metal substrate 110 on the surface is oxidized to form a second protective film 111. The surface of the metal substrate 110 has a texture structure, and the shape of the texture structure may be designed as required to satisfy the decoration of the battery cover 100 and improve the aesthetic feeling of the battery cover 100. When the purity of the second protective film 111 is less than or equal to 50%, it can be understood that the second protective film 111 is a light color film, and the thickness of the second protective film 111 is 8 μm to 12 μm; when the purity of the second protective film 111 is more than 50%, it can be understood that the second protective film 111 is a dark film, and the thickness of the second protective film 111 is 18 μm to 22 μm. In another embodiment, the battery cover 100 may further include a transparent protection layer, which is coated on the surface of the metal substrate 110 by using a transparent polymer material, so as to increase the brightness of the battery cover 100 and improve the appearance of the battery cover 100.
As shown in fig. 5, in an embodiment, a method for manufacturing a metal structural member is provided, including:
s110, cutting a metal plate to obtain a rough blank;
s120, placing the rough blank in a mold 300 and heating, wherein the mold 300 comprises an upper mold 310 and a lower mold 320, the upper mold 310 comprises an inner surface 311, the inner surface 311 is provided with a concave-convex texture structure, and the lower mold 320 is provided with a vent hole 321; and
s130, introducing gas into the mold 300 through the vent holes 321 to make the rough blank fit to the inner surface 311 to obtain the metal substrate 110, and etching the texture structure of the inner surface 311 on the surface of the metal substrate 110.
In one embodiment, a rolled sheet or an extruded sheet of 0.4mm to 3.0mm such as an aluminum alloy is selected as the metal sheet, the surface of the metal sheet is required to have no obvious defects, impurity points and black lines, and the surface roughness (Ra) of the metal sheet is not more than 1.6 μm so as to meet the appearance requirement of the battery cover 100; in another embodiment, titanium alloy and stainless steel can be used as the material of the metal plate.
In one embodiment, the metal plate is cut according to the size of the mold 300 to obtain a rough blank, the cut edge has no burr or flash, and the surface of the rough blank after cutting has no defects such as scratches. And an anode hanging hole and a positioning hole are formed in the surface of the cut rough blank.
In one embodiment, the cut rough blank is subjected to surface pretreatment so as to form a first protective film on the surface of the rough blank, thereby increasing the hardness of the rough blank and preventing the surface of the rough blank from being scratched and generating defects in subsequent processes. In one embodiment, the surface pretreatment is anodization; in another embodiment, the surface pretreatment is micro-arc oxidation. In one embodiment, when the thickness of the first protective film is 0.5 μm to 4 μm and the thickness of the first protective film is less than 0.5 μm, the surface hardness of the blank is low and the scratch prevention effect cannot be achieved, and when the thickness of the first protective film is more than 4 μm, the first protective film is easily cracked during the subsequent processing of the texture structure.
As shown in fig. 6 and 7, in an embodiment, a mold 300 is prepared, the mold 300 includes an upper mold 310 and a lower mold 320, the upper mold 310 is recessed inward and includes an inner surface 311, the inner surface 311 is provided with a concave-convex texture structure, and the lower mold 320 is provided with a vent hole 321. The upper die 310 of the die 300 is blown clean by compressed air, the texture structure is located on the inner surface 311 of the upper die 310, and when the upper die 310 is blown by compressed air, aluminum chips and dust attached to the inner surface 311 are easy to fall off, so that the yield of products can be improved. The blank is fixed to the upper mold 310 or the lower mold 320 through the positioning hole, the upper mold 310 and the lower mold 320 are closed, and the mold 300 is heated to 520 ℃ to 580 ℃ to raise the temperature of the blank. It is understood that the specific temperature value can be adjusted according to the plastic deformability of the selected material of the blank, and the temperature value can also be greater than 580 ℃ or less than 520 ℃.
As shown in fig. 7, in one embodiment, a gas is introduced into the mold 300 through the vent holes 321 of the lower mold 320, and the pressure of the gas is 50MPa to 500 MPa. The blank is deformed by the influence of the temperature and the gas pressure to adhere to the inner surface 311 of the upper mold 310, and the texture of the inner surface 311 of the upper mold 310 is replicated on the surface of the blank by the gas accumulation and the softening of the blank, thereby manufacturing the metal substrate 110. The mold is opened and the metal substrate 110 is taken out. The time for closing the mold 300 is controlled to be 0.5min to 3min, and it can be understood that the time from the time when the blank is placed in the mold to the time when the mold is opened to take out the metal substrate 110 is 0.5min to 3 min.
As shown in fig. 8, in one embodiment, including S140, the metal substrate 110 is anodized. After the texture structure is etched on the metal substrate 110, the metal substrate 110 is removed, and the skirt around the metal substrate 110 is removed by punching. The metal substrate 110 from which the skirt is removed is anodized to form a second protective film 111 on the surface. When the second protective film 111 is in the first color, the thickness of the second protective film 111 is 8 μm to 12 μm to meet the requirement of the wear resistance of the battery cover 100, and the first color can be understood as light color, i.e., silver color, pink color, etc.; the thickness of the second protective film 111 is 18 to 22 μm in the case that the second protective film 111 is of the second color, which can be understood as a dark color, i.e., blue, black, etc., to satisfy the wear resistance requirement of the battery cover 100.
In one embodiment, including S150, the metal substrate 110 with the second protective film 111 is CNC-machined so that the size of the battery cover 100 meets the tolerance requirement, and the battery cover 100 is fully inspected.
According to the manufacturing method of the battery cover 100, the inner surface 311 of the upper die 310 forms the outer surface of the battery cover 100, aluminum dust and the like mixed in the die 300 can fall off under the action of gravity, the reject ratio of impurities on the surface of the battery cover 100 is reduced, the yield is improved, and the production cost is reduced; in addition, when the battery cover 100 is demolded, the battery cover falls naturally, the texture structure on the surface of the battery cover 100 is prevented from being scratched, and the yield is improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method of making a metallic structural member, comprising:
s110, cutting a metal plate to obtain a rough blank;
s120, placing the rough blank in a mold, closing the mold and heating, wherein the mold comprises an upper mold and a lower mold, the upper mold comprises an inner surface, the inner surface is provided with a concave-convex texture structure, and the lower mold is provided with a vent hole; and
s130, introducing gas into the mold through the vent hole, enabling the rough blank to be attached to the inner surface to obtain a metal substrate, and re-engraving the texture structure of the inner surface on the surface of the metal substrate.
2. The method of claim 1, wherein in step S110, the cut rough blank is subjected to a surface preparation process to form a first protective film on the surface of the rough blank.
3. The method of claim 2, wherein the surface pretreatment comprises anodic oxidation or micro-arc oxidation, and the thickness of the first protective film is 0.5 μm to 4 μm.
4. The method for manufacturing a metal structural member according to claim 1, wherein in S110, the rough blank is provided with positioning holes.
5. The method for manufacturing a metal structural member according to claim 4, wherein in step S120, the upper die is blown clean by compressed air, the rough blank is fixed in the die through the positioning hole, and the die is heated to 520 ℃ to 580 ℃.
6. The method for manufacturing a metallic structural member according to claim 1, wherein the pressure of the gas introduced into the mold through the vent hole is 50MPa to 500MPa, and the mold closing time of the mold is controlled to 0.5min to 3 min.
7. The method for manufacturing a metal structural member according to claim 1, comprising step S140 of anodizing a surface of the metal substrate to form a second protective film.
8. The method for manufacturing a metal structural member according to claim 7, wherein the second protective film is of the first color, and the thickness of the second protective film is 8 μm to 12 μm; or the second protective film is in a second color, and the thickness of the second protective film is 18-22 μm.
9. The method for manufacturing a metal structural member according to any one of claims 1 to 8, wherein the metal structural member is made of an aluminum alloy, a titanium alloy, or stainless steel.
10. A mobile terminal, characterized by comprising the metal structure manufactured by the method for manufacturing a metal structure according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910196174.2A CN111687589A (en) | 2019-03-15 | 2019-03-15 | Manufacturing method of metal structural part and mobile terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910196174.2A CN111687589A (en) | 2019-03-15 | 2019-03-15 | Manufacturing method of metal structural part and mobile terminal |
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| CN111687589A true CN111687589A (en) | 2020-09-22 |
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| CN201910196174.2A Pending CN111687589A (en) | 2019-03-15 | 2019-03-15 | Manufacturing method of metal structural part and mobile terminal |
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| CN109119652A (en) * | 2017-06-23 | 2019-01-01 | 丰田自动车株式会社 | The manufacturing method of separator for fuel battery |
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2019
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001129616A (en) * | 1999-10-28 | 2001-05-15 | Honda Motor Co Ltd | Die assembly for molding products having different thickness |
| JP2001150046A (en) * | 1999-11-22 | 2001-06-05 | Honda Motor Co Ltd | Reinforced construction of superplastic forming mold |
| CN1559719A (en) * | 2004-03-02 | 2005-01-05 | 广东工业大学 | Metal plate material hydraulic shaping method and its mould device |
| CN101507998A (en) * | 2008-02-14 | 2009-08-19 | 福特全球技术公司 | Method and apparatus for superplastic forming |
| CN101596565A (en) * | 2008-06-03 | 2009-12-09 | 联盛发科技股份有限公司 | The two-section type molding method of metallic plate |
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Application publication date: 20200922 |
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