CN110674541A - Middle frame manufacturing method, middle frame and electronic equipment - Google Patents
Middle frame manufacturing method, middle frame and electronic equipment Download PDFInfo
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- CN110674541A CN110674541A CN201910795265.8A CN201910795265A CN110674541A CN 110674541 A CN110674541 A CN 110674541A CN 201910795265 A CN201910795265 A CN 201910795265A CN 110674541 A CN110674541 A CN 110674541A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 238000003754 machining Methods 0.000 claims abstract description 80
- 238000012545 processing Methods 0.000 claims abstract description 60
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- 238000005304 joining Methods 0.000 claims abstract description 14
- 238000001746 injection moulding Methods 0.000 claims abstract description 8
- 230000002093 peripheral effect Effects 0.000 claims description 12
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Abstract
The invention relates to a method for manufacturing a middle frame, which comprises the following steps: providing a blank; the blank comprises: the left workpiece processing area, the connecting area and the right workpiece processing area are sequentially connected; performing CNC machining on the blank to form a left inner cavity structure and a right inner cavity structure; performing injection molding treatment on the blank to form a plastic part in the left inner cavity structure and the right inner cavity structure; performing CNC machining on the blank to refine the left piece machining area and the right piece machining area and obtain a formed left piece and a formed right piece; the blank is CNC machined to remove the joining zones and obtain separate left and right pieces. Meanwhile, the middle frame and the electronic equipment are provided. The invention has the beneficial effects that: the center adopts the mode preparation that processes out left part and right part simultaneously on same stock, guarantees that left part and right part have high uniformity in machining precision and equipment, and then makes left part and right part all can realize accurate assembly with flexible screen to the flatness meets the requirements when guaranteeing flexible screen expansion.
Description
Technical Field
The present invention relates to the field of electronic product manufacturing technologies, and in particular, to a method for manufacturing a middle frame, and an electronic device.
Background
Along with the development of the intelligent mobile terminal, the screen size of the intelligent mobile terminal is developing in an increasing direction. The increase in the size of the screen inevitably results in an increase in the area it needs to occupy and therefore becomes increasingly difficult to carry. In order to solve the contradiction between the increase of the screen size and the convenience of carrying, the folding screen type mobile terminal is produced. The folding screen type mobile terminal is characterized in that a flexible screen is applied to a foldable middle frame. The middle frame of the mobile terminal is divided into a left piece and a right piece, and the left piece and the right piece are movably connected through a hinge piece. When assembled, the flexible screen is mounted on the left and right pieces. And the left piece and the right piece form a flat structure or a folding structure in a turnover mode. When a user needs to use the function of the large screen, the left piece and the right piece are turned over to the same plane, and the middle frame forms a flat structure. When the user needs to fold the screen, the right piece is turned over to the back of the left piece (or the left piece is turned over to the back of the right piece), and at the moment, the middle frame forms a folding structure.
Because the folding screen type mobile terminal is a novel product, and most of the middle frames of the traditional mobile terminal are in a straight plate structure, at present, in the field of production and manufacturing of intelligent mobile terminals, a mature manufacturing process is not provided for the folding middle frames contained in the folding screen type mobile terminal. In the manufacturing process of the folding middle frame, one of the technical difficulties is as follows: the left piece and the right piece are required to be accurately assembled with the flexible screen, so that the flatness meets the requirement when the flexible screen is unfolded. The key points for solving the technical difficulty are as follows: how to ensure that the left part and the right part have high consistency in machining precision and assembly.
Disclosure of Invention
Based on the method, the left piece and the right piece are simultaneously processed on the same blank, the high consistency of the processing precision and the assembly of the left piece and the right piece is guaranteed, the left piece and the right piece can be accurately assembled with the flexible screen, and therefore the flatness of the flexible screen is guaranteed to meet the requirement when the flexible screen is unfolded.
A manufacturing method of a middle frame comprises the following steps:
providing a blank; the blank comprises: the left workpiece processing area, the connecting area and the right workpiece processing area are sequentially connected; the left piece processing area is used for manufacturing a left piece of the middle frame; the right piece processing area is used for manufacturing a right piece of the middle frame;
performing CNC machining on the blank to form a left inner cavity structure located in a left workpiece machining area and a right inner cavity structure located in a right workpiece machining area;
performing injection molding treatment on the blank to form a plastic part in the left inner cavity structure and the right inner cavity structure;
performing CNC machining on the blank to refine the left piece machining area and the right piece machining area and obtain a formed left piece and a formed right piece;
the blank is CNC machined to remove the joining zones and obtain separate left and right pieces.
According to the manufacturing method of the middle frame, the left piece and the right piece of the middle frame are machined on the same blank, and the left piece and the right piece are connected together through the connecting area before being separated, so that the left piece and the right piece are machined on the basis of the same machining standard in each machining process when the left piece machining area and the right piece machining area are machined in each time, the machining accuracy control of each machining can adopt the unified standard, the left piece and the right piece are guaranteed to have high consistency in machining accuracy, and the high consistency of the left piece and the mail in assembly is further guaranteed. Through the design, the mode that the left part and the right part are processed on the same blank at the same time is adopted, the consistency that the left part and the right part have a high degree in processing precision and assembly is guaranteed, and then the left part and the right part can be accurately assembled with the flexible screen, so that the flatness meets the requirements when the flexible screen is unfolded.
In one embodiment, after the step of providing the blank and before the step of performing CNC machining on the blank to form the left piece of inner cavity structure located in the left piece machining area and the right piece of inner cavity structure located in the right piece machining area, the method further comprises the steps of: and carrying out CNC machining on the front surface of the blank to form first stress relief grooves distributed on the left workpiece machining area and the right workpiece machining area. In the process of processing the front surface of the blank, the left piece and the right piece are both provided with screen areas corresponding to the flexible screens, so that the flatness of the left piece and the right piece has higher requirements. In the blank processing process, internal stress can be accumulated in the blank, so that the blank is deformed, the flatness of the left piece and the right piece is poor, the internal stress on the blank is released by arranging the first stress relief groove in the front of the blank, and the risk of blank deformation is reduced.
In one embodiment, in the step of CNC-processing the blank to refine the left and right workpiece processing areas and obtain the formed left and right workpieces, the reverse side of the blank is CNC-processed to form the second stress relief grooves distributed in the joining area; the second stress relief groove is disposed along a length of the connection region. In the process of processing the front surface of the blank, the left piece and the right piece are both provided with screen areas corresponding to the flexible screens, so that the flatness of the left piece and the right piece has higher requirements. In the process of processing the blank, internal stress can be accumulated in the blank, so that the blank is deformed, and the flatness of the left piece and the right piece is poor, therefore, a second stress removing groove is formed in the reverse side of the blank to generate reverse acting force, and the purpose of releasing the internal stress is achieved.
In one embodiment, in the step of CNC-processing the blank to refine the left and right workpiece processing regions and obtain the formed left and right workpieces, the blank is CNC-processed to form third stress relief grooves distributed at ends of the joining region; the third stress relief groove is provided along the width direction of the connection region. In the blank processing process, the left piece and the right piece are both provided with screen areas corresponding to the flexible screens, so that the flatness of the left piece and the right piece has higher requirements. In the process of processing the blank, internal stress is accumulated in the blank, so that the blank is deformed, and the flatness of the left piece and the right piece is poor, therefore, the internal stress corresponding to the cut-off part of the connecting area and the left piece and the right piece is released by arranging a third stress relief groove on the blank.
In one embodiment, the step of CNC-machining the blank to refine the left and right workpiece machining zones and obtain the shaped left and right workpieces comprises the steps of:
performing CNC machining on the front surface of the blank to finish the left inner cavity structure and the right inner cavity structure;
performing CNC machining on the reverse side of the blank to finish the left inner cavity structure and the right inner cavity structure;
and performing CNC machining on the outer periphery of the blank to refine the outer periphery structure of the left workpiece machining area and the outer periphery structure of the right workpiece machining area.
In the blank fine trimming process of injection molding, the left inner cavity structure and the right inner cavity structure can be machined in the same CNC machining step, and the consistency of the machining precision of the left inner cavity structure and the right inner cavity structure is ensured. In contrast, the outer peripheral edge structure of the left piece and the outer peripheral edge structure of the right piece are then machined in another CNC machining step to ensure consistency of the machining accuracy of the outer peripheral edges of the left and right pieces.
In one embodiment, in the step of performing CNC machining on the front surface of the blank to finish the left and right internal cavity structures, the dimensional tolerance in the height direction in the left and right internal cavity structures is controlled to be within ± 0.03 mm. In order to avoid the segment difference feeling generated after the middle frame is assembled with the parts of the middle frame, when the inner cavity structure of the left part and the inner cavity structure of the right part are refined, the dimensional tolerance in the height direction needs to be controlled within +/-0.03 mm.
In one embodiment, in the step of performing CNC machining on the blank to refine the left and right piece machining areas and obtain the formed left and right pieces, the dimensions of the structures corresponding to the left and right pieces are uniformly managed with tolerances. In order to ensure that the corresponding structures of the left piece and the right piece have high consistency, in the machining process, the sizes need to be controlled by tolerance in a unified mode, and the sizes cannot be controlled by level differences.
In one embodiment, in the step of CNC-machining the blank to remove the joining region and obtain the separated left and right pieces, the flatness of the cut surfaces of the left and right pieces and the joining region and the cut surfaces of the right and joining region are controlled to be within 0.25 mm. The cut surface of the left piece and the connecting area and the cut surface of the right piece and the connecting area are used for butting the hinged parts, so the flatness of the cut surfaces influences the assembly precision of the hinged parts, if the flatness is poor, the flexible screen cannot meet the flatness requirement when being unfolded, and therefore the flatness of the cut surfaces needs to be controlled within 0.25 mm.
Meanwhile, the invention also provides a middle frame.
A middle frame is manufactured by adopting the middle frame manufacturing method of any embodiment. The middle frame has the advantages that the left part and the right part are simultaneously processed on the same blank, the left part and the right part are highly consistent in processing precision and assembly, and then the left part and the right part can be accurately assembled with the flexible screen, so that the flatness meets the requirement when the flexible screen is unfolded.
Meanwhile, the invention also provides electronic equipment.
An electronic device comprises the middle frame. The middle frame in the electronic equipment is manufactured in a mode that a left part and a right part are simultaneously processed on the same blank, the left part and the right part have high consistency in processing precision and assembly, and then the left part and the right part can be accurately assembled with the flexible screen, so that the flatness meets the requirement when the flexible screen is unfolded.
Drawings
FIG. 1 is a flow chart illustrating a method for manufacturing a middle frame according to an embodiment of the present invention;
FIG. 2 is a schematic view of a blank in the method for manufacturing the middle frame shown in FIG. 1;
FIG. 3 is a schematic view of the blank of FIG. 2 after processing a first de-stressing groove;
FIG. 4 is a schematic diagram of the front surface of the blank shown in FIG. 3 after CNC machining to obtain a left inner cavity structure and a right inner cavity structure;
FIG. 5 is a schematic diagram of the reverse side of the blank shown in FIG. 4 after CNC machining to obtain a left inner cavity structure and a right inner cavity structure;
FIG. 6 is a schematic front view of the blank of FIG. 5 after CNC finishing of the left and right inner cavities;
FIG. 7 is a schematic reverse side view of the blank of FIG. 6 after CNC finishing of the left and right inner cavities;
FIG. 8 is a schematic view of the blank of FIG. 7 after CNC finishing of the outer peripheral edge;
FIG. 9 is a schematic view of the blank of FIG. 8 after the removal of the attachment area to obtain a left piece;
fig. 10 is a schematic view of the blank of fig. 8 after removal of the attachment area to obtain a right piece.
The meaning of the reference symbols in the drawings is:
10-a blank, 11-a left piece processing area, 12-a connecting area, 13-a right piece processing area, 14-a first stress relief groove, 15-a second stress relief groove and 16-a third stress relief groove;
20-left part;
30-right piece.
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.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Fig. 1 to 10 show a method for manufacturing a middle frame according to an embodiment of the present invention.
As shown in fig. 1, the method for manufacturing the middle frame includes the steps of:
s10: a blank 10 is provided. The blank 10 comprises: a left piece processing area 11, a connecting area 12 and a right piece processing area 13 which are connected in sequence. The left piece processing area 11 is used for manufacturing a left piece of the middle frame, and the right piece processing area 13 is used for manufacturing a right piece of the middle frame.
As shown in fig. 2, a flat plate-like rectangular metal blank 10 is provided. The blank 10 was made of AL-6A08, and had a flatness of 0.25mm and a hardness of HV 110. Based on the design principle of the present method, the blank 10 needs to be used for simultaneously processing the left and right pieces of the middle frame, and therefore, as shown in fig. 2, the blank 10 includes a left piece processing region 11, a connecting region 12, and a right piece processing region 13 which are connected in sequence. In addition, the area ratio of the blank 10 to the left and right processing zones 11 and 13 can be adjusted according to the demand of the product.
In the process of processing the front surface of the blank 10, the left piece and the right piece are both provided with screen areas corresponding to the flexible screens, so that the flatness of the left piece and the right piece has higher requirements. During the processing of the blank 10, internal stress may be accumulated in the blank 10, thereby causing the blank 10 to deform, and further causing poor flatness of the left and right pieces. Accordingly, a corresponding improvement can be made with respect to the problem of internal stress. For example, in the present embodiment, after S10 and before S20, the method may further include the steps of: as shown in fig. 3, the front surface of the blank 10 is CNC-machined to form first stress relief grooves 14 distributed on the left and right workpiece processing areas 11 and 13. Wherein, the number of the first stress relieving grooves 14 is a plurality. As shown in fig. 3, the first stress relief groove 14 is a blind groove, for example, a blind groove having a depth of 2.53 ± 0.08 mm. Furthermore, the first stress relief grooves 14 may be distributed in the longitudinal direction and/or the transverse direction of the blank 10.
The risk of deformation of the blank 10 is reduced by opening the first stress relief groove 14 in the front side of the blank 10 to relieve internal stress on the blank 10.
S20: the blank 10 is CNC-machined to form a left piece cavity structure in a left piece machining area 11 and a right piece cavity structure in a right piece machining area 13.
After the blank 10 is obtained, CNC rough machining is performed on the blank 10 to form a prototype of the inner cavity structure of the front and back sides of the left piece and a prototype of the inner cavity structure of the front and back sides of the right piece, respectively.
For example, in step S20, the method may include the steps of:
s21: as shown in fig. 4, the front surface of the blank 10 is CNC-processed to form a left piece cavity structure on the front surface of the left piece processing region 11 and a right piece cavity structure on the front surface of the right piece processing region 13.
S22: as shown in fig. 5, the reverse side of the blank 10 is CNC-processed to form a left piece cavity structure on the reverse side of the left piece processing area 11 and a right piece cavity structure on the reverse side of the right piece processing area 13.
The front and back surfaces of the left inner cavity structure and the right inner cavity structure are machined by adopting step-by-step CNC machining, and the reason is that the front and back surfaces are difficult to be machined simultaneously in the same clamping position, so that the front and back surfaces are split into two clamping positions for CNC machining, and the clamping difficulty is reduced.
S30: the blank 10 is subjected to an injection molding process to form a plastic part in the left inner cavity structure and the right inner cavity structure.
Because the plastic parts need to be arranged in the left inner cavity structure and the right inner cavity structure based on the structural requirements of the product, the injection molding treatment needs to be performed on the blank 10. For the injection molding treatment, a Nano Molding Technology (NMT) can be adopted, which is a process of combining metal and plastic by a Nano technology, i.e., after the metal surface is subjected to Nano treatment, plastic is directly injected and molded on the metal surface, so that the metal and the plastic can be integrally formed, not only can the appearance and the texture of the metal be considered, but also the structural member design of the product can be simplified, and the product is lighter, thinner, shorter and smaller.
S40: the blank 10 is CNC-machined to finish the left and right workpiece machining areas 11 and 13 and obtain the formed left and right pieces 20 and 30.
After the injection molding is completed, the left and right workpiece processing areas 11 and 13 need to be finished in order to obtain the formed left and right workpieces 20 and 30.
Here, S40 may include the steps of:
s41: as shown in fig. 6, CNC machining is being performed on the blank 10 to refine the left piece internal cavity structure and the right piece internal cavity structure.
S42: as shown in fig. 7, the reverse side of the blank 10 is CNC-machined to refine the left and right internal cavity structures.
S43: as shown in fig. 8, the outer peripheral edge of the blank 10 is CNC-processed to refine the outer peripheral edge structure of the left piece processing area 11 and the outer peripheral edge structure of the right piece processing area 13.
In the finishing process of the injection molded blank 10, the left inner cavity structure and the right inner cavity structure can be processed in the same CNC processing step, so that the consistency of the processing precision of the left inner cavity structure and the right inner cavity structure is ensured. In contrast, the outer peripheral edge structure of the left piece and the outer peripheral edge structure of the right piece are then machined in another CNC machining step to ensure consistency of the machining accuracy of the outer peripheral edges of the left and right pieces.
In consideration of the problem of releasing the internal stress, a corresponding modification can be made in S40. In the process of processing the blank 10, the left piece and the right piece are both provided with screen areas corresponding to the flexible screens, and therefore, the flatness of the left piece and the right piece has higher requirements. During the processing of the blank 10, internal stress may be accumulated in the blank 10, thereby causing the blank 10 to deform, and further causing poor flatness of the left and right pieces.
For example, as shown in fig. 7, in this embodiment, in S40, the opposite side of the blank 10 is CNC-machined to form the second stress relief grooves 15 distributed in the joint region 12. The second stress relief groove 15 is provided along the length of the connection region 12. The purpose of releasing the internal stress is achieved by opening a second stress relief groove 15 on the reverse side of the blank 10 to generate a reverse acting force. For example, in the present embodiment, the second stress relief groove 15 is a blind groove, for example, a blind groove having a depth of 2.53 ± 0.08 mm.
For another example, as shown in fig. 7, in the present embodiment, in S40, the blank 10 is CNC-machined to form the third stress relief grooves 16 distributed at the end of the joining region 12. The third stress relief groove 16 is provided along the width direction of the connection region 12. The internal stress corresponding to the cut of the joint region 12 and the left and right pieces is relieved by forming a third stress relief groove 16 in the blank 10. As shown in fig. 7, in the present embodiment, the third stress relieving groove 16 is a through groove penetrating through the front and back sides of the blank 10.
Further, in S40, the dimensional tolerance in the height direction in the left piece cavity structure and the right piece cavity structure may be controlled to be within ± 0.03 mm. In order to avoid the segment difference feeling generated after the middle frame is assembled with the parts of the middle frame, when the inner cavity structure of the left part and the inner cavity structure of the right part are refined, the dimensional tolerance in the height direction needs to be controlled within +/-0.03 mm.
Further, in S40, the dimensions of the structures corresponding to the left and right pieces are uniformly governed by tolerances. In order to ensure that the corresponding structures of the left piece and the right piece have high consistency, in the machining process, the sizes need to be controlled by tolerance in a unified mode, and the sizes cannot be controlled by level differences.
S50: the blank 10 is CNC machined to remove the attachment area 12 and obtain the left and right separate pieces 20, 30.
Since both the left and right members 20 and 30 are simultaneously processed on the blank 10 in order to ensure the consistency of the left and right members 20 and 30 in the aforementioned S10-S40, it is necessary to remove the joining region 12 to obtain the separated left and right members 20 and 30 after the left and right members 20 and 30 are formed, as shown in fig. 9 and 10.
Furthermore, the cut-off surface of the left piece and the connection area 12 and the cut-off surface of the right piece and the connection area 12 are for abutting the hinge. Therefore, the flatness of the cut surface affects the precision of the hinge assembly, and if the flatness is poor, the flatness requirement cannot be met when the flexible screen is unfolded. Therefore, in the present embodiment, in S50, the flatness of the cut surface of the left piece and the attachment area 12 and the cut surface of the right piece and the attachment area 12 is controlled to be within 0.25 mm.
According to the manufacturing method of the middle frame, the left piece and the right piece of the middle frame are machined on the same blank 10 and are connected together through the connecting area 12 before the left piece and the right piece are separated, so that the machining of the left piece and the right piece is based on the same machining standard in the CNC machining process when the left piece machining area 11 and the right piece machining area 13 are machined each time, the unified standard can be adopted for the control of the machining precision each time, the left piece and the right piece are guaranteed to have high consistency in machining precision, and the high consistency of the left piece and the mail in assembly is further guaranteed. Through the design, the mode that the left part and the right part are processed on the same blank 10 at the same time is adopted, the consistency that the left part and the right part have a high degree in processing precision and assembly is guaranteed, and then the left part and the right part can be accurately assembled with the flexible screen, so that the flatness meets the requirements when the flexible screen is unfolded.
Meanwhile, the invention also provides a middle frame.
The middle frame is manufactured by the manufacturing method of the middle frame in the embodiment. It should be noted that, in this embodiment, the middle frame is a middle frame of a folding screen type mobile phone, and in other embodiments, the middle frame may also be a middle frame of a folding screen type tablet computer, or a middle frame of an ultra-thin folding screen type notebook computer, or a middle frame of another folding screen type mobile terminal.
The middle frame has the advantages that the left part and the right part are simultaneously processed on the same blank, the left part and the right part are highly consistent in processing precision and assembly, and then the left part and the right part can be accurately assembled with the flexible screen, so that the flatness meets the requirement when the flexible screen is unfolded.
Meanwhile, the invention also provides electronic equipment.
The electronic equipment comprises the middle frame of the embodiment. It should be noted that, in this embodiment, the electronic device is a folding screen type mobile phone, and in other embodiments, the electronic device may also be a folding screen type tablet computer, or an ultrathin folding screen type notebook computer, or another folding screen type mobile terminal.
The middle frame in the electronic equipment is manufactured in a mode that a left part and a right part are simultaneously processed on the same blank, the left part and the right part have high consistency in processing precision and assembly, and then the left part and the right part can be accurately assembled with the flexible screen, so that the flatness meets the requirement when the flexible screen is unfolded.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express 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 method for manufacturing a middle frame is characterized by comprising the following steps: the method comprises the following steps:
providing a blank; the blank comprises: the left workpiece processing area, the connecting area and the right workpiece processing area are sequentially connected; the left piece processing area is used for manufacturing a left piece of the middle frame; the right piece processing area is used for manufacturing a right piece of the middle frame;
performing CNC machining on the blank to form a left inner cavity structure located in the left machining area and a right inner cavity structure located in the right machining area;
performing injection molding treatment on the blank to form a plastic part in the left part inner cavity structure and the right part inner cavity structure;
CNC machining the stock to refine the left and right piece machining zones and to obtain shaped left and right pieces;
CNC machining of the blank to remove the joining area and obtain a left and right piece separated.
2. The method of making a center of claim 1, wherein after the step of providing a blank and before the step of CNC machining the blank to form the left piece of inner chamber structure at the left piece machining zone and the right piece of inner chamber structure at the right piece machining zone, further comprising the steps of: and carrying out CNC machining on the front surface of the blank to form first stress relief grooves distributed on the left workpiece machining area and the right workpiece machining area.
3. The method for manufacturing a middle frame according to claim 1, wherein in the step of CNC-processing the blank to refine the left and right processing areas and obtain the formed left and right pieces, CNC-processing the reverse surface of the blank to form second stress relief grooves distributed at the joining area; the second stress relief groove is arranged along the length direction of the connecting area.
4. The center fabricating method as claimed in claim 1, wherein, in the step of CNC-processing the blank to refine the left and right processing areas and obtain the formed left and right pieces, the blank is CNC-processed to form third stress relief grooves distributed at ends of the joining area; the third stress relief groove is provided along a width direction of the connection region.
5. The method for making a middle frame according to claim 1, wherein the step of CNC-processing the blank to refine the left and right piece processing areas and obtain the formed left and right pieces comprises the steps of:
performing CNC machining on the front surface of the blank to finish the left inner cavity structure and the right inner cavity structure;
performing CNC machining on the reverse side of the blank to finish the left inner cavity structure and the right inner cavity structure;
performing CNC machining on the outer periphery of the blank to refine the outer peripheral structure of the left workpiece machining area and the outer peripheral structure of the right workpiece machining area.
6. The method for manufacturing a middle frame according to claim 1, wherein in the step of CNC-machining the front surface of the blank to finish the left and right inner cavity structures, the dimensional tolerance in the height direction in the left and right inner cavity structures is controlled to be within ± 0.03 mm.
7. The method for manufacturing a middle frame according to claim 1, wherein in the step of CNC machining the blank to refine the left and right piece machining areas and obtain the formed left and right pieces, the dimensions of the corresponding structures of the left and right pieces are uniformly controlled by tolerances.
8. The method of manufacturing a middle frame according to claim 1, wherein in the step of CNC-processing the blank to remove the joining region and obtain the separated left and right pieces, the flatness of the cut surfaces of the left and right pieces and the joining region is controlled to be within 0.25 mm.
9. An intermediate frame, characterized in that it is manufactured by the method of any one of claims 1 to 8.
10. An electronic device comprising the bezel of claim 9.
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