CN107087366B - Metal middle frame structure machining process, metal middle frame structure and electronic equipment - Google Patents
Metal middle frame structure machining process, metal middle frame structure and electronic equipment Download PDFInfo
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- CN107087366B CN107087366B CN201710330969.9A CN201710330969A CN107087366B CN 107087366 B CN107087366 B CN 107087366B CN 201710330969 A CN201710330969 A CN 201710330969A CN 107087366 B CN107087366 B CN 107087366B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/02—Details
- H05K5/0217—Mechanical details of casings
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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 invention relates to a metal middle frame structure, electronic equipment comprising the metal middle frame structure and a metal middle frame structure processing technology, wherein a metal frame adopts a welding forming technology, so that the forming technology reduces material waste caused by the processing allowance of the metal frame and reduces the proportion of the raw material cost in the total manufacturing cost; meanwhile, the intermediate processes of stamping, CNC machining and heat treatment are reduced, and the machining time of the metal frame is shortened, so that the production efficiency of the whole metal middle frame structure is improved, the manufacturing cost of the electronic equipment can be reduced through large-scale production, and the market competitiveness of the electronic equipment is improved.
Description
Technical Field
The invention relates to the technical field of intelligent equipment, in particular to a metal middle frame structure processing technology, a metal middle frame structure and electronic equipment comprising the metal middle frame structure.
Background
Along with the continuous development of mobile terminal technology, the application of electronic equipment such as smart phones, palm computers, smart watches and the like is very common and becomes an important component in work and life of people.
The metal center structure includes metal frame and medium plate, and is general, and traditional metal center adopts the mode of integrated into one piece rough blank, carries out CNC processing to the rough blank again, and CNC processing is comparatively complicated, and extravagant material is more, generates inefficiency, is unfavorable for manufacturing cost's reduction. The improved process adopts a split forming mode, namely a metal frame is formed by forging and pressing and CNC machining, and then the metal frame and the middle plate are combined into a metal middle frame structure, but the defects of low efficiency and high cost exist.
Disclosure of Invention
Accordingly, it is desirable to provide a metal middle frame structure, an electronic device including the same, and a process for manufacturing the metal middle frame structure, which can improve production efficiency and reduce cost.
A metal middle frame structure comprises a metal frame formed by welding and a middle plate connected in the metal frame and formed by die casting.
In one embodiment, the metal frame is in a shape of a Chinese character 'hui', and the metal frame comprises a plurality of connecting pieces which are sequentially welded end to end.
In one embodiment, the number of the connecting pieces is four, and the connecting pieces comprise U-shaped members, I-shaped members and two L-shaped members; the U-shaped component comprises a first straight line section and first bending sections which are respectively and integrally connected with two ends of the first straight line section; the L-shaped component comprises a second straight line section and a second bent section, wherein one end of the second straight line section is welded with the first bent section, and the second bent section is integrally connected to the other end of the second straight line section and is welded with the I-shaped component.
In one embodiment, an uneven reinforcing connection structure matched with the middle plate is formed on the inner surface of the metal frame.
In one embodiment, the reinforcing connection structure includes a first dovetail groove provided on an inner surface of the metal bezel and extending in a circumferential direction of the metal bezel, and a second dovetail groove provided on a bottom surface of the first dovetail groove and extending in the circumferential direction of the metal bezel.
In one embodiment, a depth of the first dovetail groove is greater than or equal to a depth of the second dovetail groove.
An electronic device comprising any of the above metal middle frame structures.
A metal middle frame structure processing technology comprises the following steps:
obtaining a plurality of linear sections;
bending the end part of one part of the linear section bar to form a bent section bar;
performing finish machining on the outer surfaces and the end parts of the bent section bar and the non-bent linear section bar;
welding the bent section bar and the non-bent linear section bar end to form a metal frame;
and putting the metal frame into a die-casting die, and die-casting to form a middle plate connected with the inner surface of the metal frame so as to form a metal middle frame structure.
In one embodiment, the uneven reinforcement connection structure is machined on the side of the linear profile before the linear profile is bent.
In one embodiment, after the middle frame structure is formed, the outer surface of the metal middle frame structure is subjected to surface treatment.
According to the metal middle frame structure, the electronic equipment comprising the metal middle frame structure and the metal middle frame structure processing technology, the metal frame adopts the welding forming technology, so that the material waste caused by the metal frame processing allowance is reduced, and the proportion of the raw material cost in the total manufacturing cost is reduced; meanwhile, the middle processes of stamping, CNC machining and heat treatment are reduced, and the machining time of the metal frame is shortened, so that the production efficiency of the whole metal middle frame structure is improved.
Drawings
FIG. 1 is a schematic structural view of a linear profile;
FIG. 2 is a schematic structural view of a linear profile formed with a reinforcing connection structure;
FIG. 3 is a schematic cross-sectional view of the linear profile of FIG. 2;
FIG. 4 is a schematic structural view of a connecting member constituting a metal frame;
FIG. 5 is a schematic structural view of the connection after finishing of the outer surfaces and ends;
FIG. 6 is an enlarged view of the structure at A in FIG. 5;
FIG. 7 is a schematic structural diagram of a welded metal frame;
fig. 8 is a schematic perspective view of a metal middle frame structure according to an embodiment;
fig. 9 is a flow chart of a processing process of the metal middle frame structure.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention 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.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "inner", "outer", "left", "right" and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Referring to fig. 8, a metal middle frame structure 10 may be applied to electronic devices such as smart phones and tablet computers. The electronic device comprises a metal frame 100 and a middle plate 200, wherein the metal frame 100 is formed by welding, the middle plate 200 is formed by die casting, and the edge of the middle plate 200 is connected with the inner surface of the metal frame 100.
Referring to fig. 4 and 7, in some embodiments, the metal frame 100 is in a shape of a Chinese character 'hui', and the metal frame 100 includes four connecting members 110 connected end to end in sequence, and the four connecting members 110 are connected by welding. The connector 110 includes a U-shaped member 112, a straight member 113, and two L-shaped members 111.
The U-shaped member 112 includes a first straight segment 112a and a first bent segment 112b, the first bent segment 112b is integrally connected with the first straight segment 112a, and the first bent segment 112b is connected to both ends of the first straight segment 112 a. The L-shaped member 111 includes a second straight line segment 111a and a second bent segment 111b, the second bent segment 111b is integrally connected with the second straight line segment 111a, and one end of the second straight line segment 111a is connected with the second bent segment 111 b. The linear member 113 is a non-bent linear member.
In fact, when the U-shaped member 112, the L-shaped member 111 and the linear member 113 are welded to form the metal frame 100, the cross section of the metal frame 100 is rectangular, the two L-shaped members 111 are mainly located on the long side of the metal frame 100, and the U-shaped member 112 and the linear member 113 are mainly located on the short side of the metal frame 100. Therefore, one end of the second straight line segment 111a of the two L-shaped members 111 is connected to the first bent segment 112b of the U-shaped member 112, and the second bent segments 111b of the two L-shaped members 111 are connected to the two ends of the straight member 113.
In other embodiments, the number of the connecting members 110 is two, three or other numbers, and the shape of the metal frame 100 may be a regular or irregular shape such as a circle or a regular polygon.
Because the metal frame 100 adopts a welding connection mode, the material waste caused by the machining allowance of the metal frame 100 is reduced, and the proportion of the raw material cost in the total manufacturing cost is reduced; meanwhile, the intermediate processes of stamping, CNC machining and heat treatment are also reduced, and the machining time of the metal frame 100 is reduced, so that the production efficiency of the whole metal middle frame structure 10 is improved.
Referring to fig. 2, 3 and 7, in some embodiments, the inner surface of the metal frame 100 is provided with the uneven reinforced connection structure 121, and in the process of die-casting the middle plate 200, the molten metal is injected into the uneven reinforced connection structure 121, so that the middle plate 200 and the metal frame 100 after being cooled, solidified and molded form a dog-tooth-staggered occlusion connection relationship, thereby enhancing the connection strength between the middle plate 200 and the metal frame 100, ensuring that the whole metal middle frame structure 10 has good anti-falling and impact-resistant properties, and prolonging the service life of the metal middle frame structure 10.
Referring to fig. 2, 3 and 7, the reinforcing connection structure 121 includes a first dovetail groove 121a and a second dovetail groove 121b, the first dovetail groove 121a is formed on the inner surface of the metal frame 100, the first dovetail groove 121a extends along the circumferential direction of the metal frame 100, the second dovetail groove 121b is formed on the bottom surface of the first dovetail groove 121a, and similarly, the second dovetail groove 121b extends along the circumferential direction of the metal frame 100. Obviously, the opening width of the first dovetail groove 121a is greater than the opening width of the second dovetail groove 121b, and it is understood that a third dovetail groove and the like may be further formed on the bottom surface of the second dovetail groove 121 b. The depth of first dovetail groove 121a is greater than or equal to the depth of second dovetail groove 121b, which is more favorable for improving the engaging capability of first dovetail groove 121a with respect to alignment plate 200.
In other embodiments, the reinforcing connecting structure 121 may be a rugged structure (wave-shaped or zigzag-shaped structure) formed by a plurality of arc-shaped slots or holes.
The invention also provides electronic equipment which comprises the metal middle frame structure 10, and the manufacturing cost of the electronic equipment is greatly reduced and the production efficiency is obviously improved due to the adoption of the metal middle frame structure 10.
Referring to fig. 7 to 9, the invention further provides a processing process of the metal middle frame structure 10, which is described by taking the example that the connecting member 110 includes a U-shaped member 112, a straight member 113 and two L-shaped members 111, and the processing process mainly includes the following steps:
s310, obtaining a plurality of linear profiles 120. Referring to fig. 1, the linear profiles 120 are four, two of the linear profiles 120 have the same length and are longest, and the other two linear profiles 120 have different lengths (one of them is shorter and the other is shortest). In some embodiments, blanking is performed in a blanking mode, and the blanking processing efficiency is high. In other embodiments, the material can be cut by means of cutting, such as hot cutting, e.g., laser cutting, arc cutting, plasma arc cutting, flame cutting, etc., or cold cutting, e.g., jet cutting, etc. Certainly, a certain machining allowance needs to be reserved during blanking.
And S330, bending the end part of one part of the linear profile 120 to form a bent profile. Referring to fig. 4, the linear bar 120 is bent by pressing, one end of the longest linear bar 120 is bent to form the L-shaped members 111, both ends of the shorter linear bar 120 are bent to form the U-shaped members 112, and the shortest linear bar 120 is not bent to maintain the original straight shape.
S340, performing finish machining on the outer surfaces and the end portions of the bent profile and the non-bent linear profile 120. Referring to fig. 5 and 6, due to the allowance for blanking, the U-shaped member 112, the linear member 113, and the L-shaped member 111 must be trimmed to a length that meets the requirement of the assembly dimension of the metal frame 100, and the end portions are ground or milled to form a certain taper, i.e., the end portions are frustum bodies 114a, so that the end portions can be accurately butted, which is beneficial to improving the quality of the welding seam 115 and the assembly precision of the metal frame 100. In addition, the outer surfaces of the three are subjected to finish machining so as to meet the requirements of relevant flatness and roughness standards.
And S350, welding the bent section bar and the non-bent linear section bar 120 end to form the metal frame 100. Referring to fig. 7, the U-shaped member 112, the in-line member 113 and the L-shaped member 111 are positioned and assembled by a jig to improve welding efficiency and accuracy, and a robot welding or manual welding method may be used. During welding, the U-shaped member 112, the linear member 113 and the L-shaped member 111 are combined into a rectangle, that is, one end of the second straight line segment 111a on the two L-shaped members 111 is respectively abutted against the end of the first bent segment 112b on the U-shaped member 112, the end of the second bent segment 111b on the two L-shaped members 111 is respectively abutted against the two ends of the linear member 113, and the metal frame 100 is formed after welding is completed at each abutted part.
And S360, putting the metal frame 100 into a die-casting die, and die-casting the middle plate 200 connected with the inner surface of the metal frame 100 to form the metal middle frame structure 10. Referring to fig. 8, the welded metal frame 100 is first embedded into a die-casting mold, then the mold is closed, molten metal is injected into a cavity of the die-casting mold at a high pressure, and after cooling, the molten metal is solidified to form the middle plate 200, and at the same time, reliable connection between the middle plate 200 and the metal frame 100 is ensured. And finally, opening the mold, and taking out the formed metal middle frame structure 10.
In some embodiments, before the bending of the linear profile 120, a step S320 of machining an uneven reinforcing connection structure 121 on the side of the linear profile 120 is further included. Referring to fig. 2 and 3, the first dovetail groove 121a and the second dovetail groove 121b are formed by CNC machining, that is, by milling with a dovetail milling cutter on a vertical milling machine. In the die-casting process of the middle plate 200, molten metal is injected under pressure to fill the space surrounded by the first dovetail groove 121a and the second dovetail groove 121b, so that the solidified and formed middle plate 200 and the metal frame 100 form a strong engagement relationship, and the connection strength between the two is further improved.
After the metal middle frame structure 10 is formed, step S370 is performed to perform surface treatment on the outer surface of the metal middle frame structure 10, when the metal middle frame structure 10 is made of stainless steel, the surface treatment is performed by performing sand blasting or mirror polishing, then performing PVD (Physical Vapor Deposition) treatment, for example, depositing a PVD coating by a magnetron sputtering method, and finally depositing an AF film (Anti-fingerprint) on the PVD coating by an AF coater to improve the wear resistance, the water resistance, and the oil resistance of the surface of the metal middle frame structure 10.
When the metal middle frame structure 10 is made of an aluminum alloy material, the surface treatment is performed by sand blasting and anodic oxidation. In some embodiments, a mechanical sand blasting process may be used to obtain a mechanical sand surface on the outer surface of the metal middle frame structure 10, for example, abrasive (such as diamond, quartz, copper ore, or iron sand) is sprayed onto the outer surfaces of the metal frame 100 and the middle plate 200 at a high speed by compressed air, and under the impact and cutting action of the abrasive sprayed at a high speed, contaminants such as grease and the like attached to the metal middle frame structure 10 are removed, so that the outer surfaces of the metal frame 100 and the middle plate 200 obtain a certain degree of cleanliness and roughness, and at the same time, the mechanical properties of the metal frame 100 and the middle plate 200 are improved, the fatigue resistance of the metal middle frame structure 10 and the wear resistance of the outer surfaces thereof are improved, and the adhesion of a subsequent oxide film is enhanced, thereby prolonging the durability of the oxide film. In other embodiments, a chemical sand finish may be obtained on the outer surface of the metal middle frame structure 10 by pitting action of a chemical medium.
And finally, carrying out anodic oxidation treatment on the outer surface subjected to the sand blasting treatment. When the metal middle frame structure 10 is used as an anode and reacts in the electrolyte for a set time, an oxide film is formed on the outer surface of the metal middle frame, and the oxide film can be about 30 μm. Due to the action of the oxide film, the hardness and the wear resistance of the outer surface of the metal middle frame structure 10 are improved, and the service life of the metal middle frame structure 10 is further prolonged. 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 invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A metal middle frame structure is characterized by comprising a metal frame formed by welding and a middle plate connected in the metal frame and formed by die casting, wherein the metal frame is shaped like a Chinese character 'hui', the metal frame comprises a plurality of connecting pieces which are sequentially connected by welding from head to tail, and the metal frame is connected with the middle plate formed by die casting in a die casting die; the metal frame is characterized in that a connection reinforcing structure matched with the middle plate and uneven is arranged on the inner surface of the metal frame, the connection reinforcing structure comprises a first dovetail groove and a second dovetail groove, the first dovetail groove is arranged on the inner surface of the metal frame and extends along the circumferential direction of the metal frame, the second dovetail groove is arranged on the bottom surface of the first dovetail groove and extends along the circumferential direction of the metal frame, and the end portion of the connecting piece is a frustum pyramid.
2. The metal middle frame structure according to claim 1, wherein the number of the connecting members is four, and the connecting members include a U-shaped member, a straight member and two L-shaped members; the U-shaped component comprises a first straight line section and first bending sections which are respectively and integrally connected with two ends of the first straight line section; the L-shaped component comprises a second straight line section and a second bent section, wherein one end of the second straight line section is welded with the first bent section, and the second bent section is integrally connected to the other end of the second straight line section and is welded with the I-shaped component.
3. The metal middle frame structure according to claim 1, wherein the first and second dovetail grooves are formed by CNC machining.
4. The metal middle frame structure according to claim 3, wherein the first dovetail groove and the second dovetail groove are milled and formed by a dovetail milling cutter on a vertical milling machine.
5. The metal middle frame structure according to claim 4, wherein a depth of the first dovetail groove is greater than a depth of the second dovetail groove.
6. The metal middle frame structure according to claim 4, wherein a depth of the first dovetail groove is equal to a depth of the second dovetail groove.
7. An electronic device comprising the metal bezel structure of any one of claims 1 to 6.
8. A metal middle frame structure processing technology is characterized by comprising the following steps:
obtaining a plurality of linear sectional materials, and processing a first dovetail groove and a second dovetail groove on the side surface of each linear sectional material to enable the second dovetail groove to be arranged on the bottom surface of the first dovetail groove;
bending the end part of one part of the linear section bar to form a bent section bar;
performing finish machining on the outer surfaces and the end parts of the bent section bar and the non-bent linear section bar, and enabling the end parts to form frustum bodies;
welding the bent section bar and the non-bent linear section bar end to form a metal frame;
and putting the metal frame into a die-casting die, and die-casting to form a middle plate connected with the inner surface of the metal frame so as to form a metal middle frame structure.
9. The process of claim 8, wherein the uneven reinforcement connection structure is formed on the side surface of the linear profile before the linear profile is bent.
10. The process of claim 8, wherein the outer surface of the metal middle frame structure is surface treated after the middle frame structure is formed.
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| US11089142B2 (en) | 2018-01-17 | 2021-08-10 | Guangdong Everwin Precision Technology Co., Ltd. | Process of processing middle frame of mobile phone |
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