CN110369951B - Machining method of metal middle frame and metal middle frame - Google Patents

Abstract

A processing method of a metal middle frame comprises the following steps: providing a metal section; respectively carrying out primary processing on the front surface and the back surface of the metal section, processing a front side initial groove in the middle of the front surface of the metal section, and processing a back side initial groove in the middle of the back surface of the metal section to obtain a middle frame initial shape; carrying out double-sided grinding on the primary shape of the middle frame; processing an injection molding slot position and an antenna slot position on the middle frame prototype; performing injection molding treatment on the initial shape of the middle frame to obtain a composite frame body; and performing finish machining on the composite frame body to obtain the metal middle frame. Through carrying out primary processing respectively at the front and the reverse side of metal section bar before the former type of center grinds and trench processing, the initial recess of positive side and the initial recess of contra-lateral have produced the release to the stress of the former type of center to can avoid compound framework follow-up processing to produce local deformation and influence the plane degree effect because of the effect of internal stress. The invention also comprises a metal middle frame which is manufactured by the processing method of the metal middle frame.

Description

Processing method of metal middle frame and metal middle frame

technical field

The invention relates to the technical field of electronic equipment, in particular to a processing method of a metal middle frame and a metal middle frame.

Background technique

With the continuous development of mobile terminal technology, the application of electronic devices such as smart phones and PDAs has become extremely common and has become an important part of people's work and life. The outer shell of electronic devices usually adopts a metal middle frame structure. The advantages of wear resistance and easy heat dissipation can make the product leave a high-end impression to users.

In the production and assembly of these electronic devices, the metal middle frame is first processed by CNC machine tools, and then the metal middle frame is assembled for the installation of circuit boards, batteries, etc., and the capacitive touch screen and battery cover are installed before and after the metal middle frame. Tablet and other electronic devices.

However, due to the continuous pursuit of smaller thicknesses for smart electronic devices, the overall structure of the metal middle frame tends to be weak, which leads to easy deformation of the metal middle frame, which affects the assembly effect of the smart electronic device.

SUMMARY OF THE INVENTION

Based on this, it is necessary to provide a processing method of a metal middle frame that can avoid deformation of the metal middle frame, and a metal middle frame made by the method.

A method for processing a metal middle frame, comprising the following steps:

Provide metal profiles;

Preliminary processing is carried out on the front and back sides of the metal profile, the front side initial groove is processed in the middle of the front side of the metal profile, and the reverse side initial groove is processed in the middle of the back side of the metal profile to obtain the middle frame preliminary shape ;

Double-sided grinding of the initial shape of the middle frame;

The injection molding slot and the antenna slot are processed on the preliminary shape of the middle frame;

Carrying out the injection molding process on the initial shape of the middle frame to obtain a composite frame body;

Finishing processing is performed on the composite frame body to obtain a metal middle frame.

The processing method of the above-mentioned metal middle frame is to carry out preliminary processing on the front and back sides of the metal profile before the initial shape of the middle frame is ground and grooved, and the initial grooves on the positive side and the initial grooves on the reverse side are used for the initial shape of the middle frame. The stress is released, so that the subsequent processing of the composite frame body can avoid local deformation and affect the flatness effect due to the action of internal stress, and ensure that the metal middle frame meets the assembly requirements.

In one embodiment, when preliminary processing is performed on the front side of the metal profile, an upper boss is reserved on the front side of the metal profile; when preliminary processing is performed on the reverse side of the metal profile, the upper boss is reserved on the back side of the metal profile There is a lower boss, so that in the process of double-sided grinding, the middle part of the two sides respectively provides support to the initial shape of the middle frame, so as to ensure the flatness of the initial shape of the middle frame after grinding.

In one embodiment, in the step of processing the injection molding slot and the antenna slot on the front surface of the middle frame preliminary shape, the first clamp platform for supporting the metal middle frame is sucked through the first vacuum suction hole. The reverse side of the metal middle frame is adsorbed, thereby improving the degree of fit between the reverse side of the initial shape of the middle frame and the support surface of the first fixture platform, and improving the flatness after processing; the step of finishing the composite frame body includes: The front surface of the composite frame body is subjected to finishing processing, and when the front surface of the composite frame body is precisely processed, the second clamp platform for supporting the composite frame body is used to support the composite frame body through the second vacuum suction hole. The reverse side of the frame body is adsorbed, so as to improve the degree of fit between the support surface of the second clamp platform and the reverse side of the composite frame body, and improve the flatness after processing.

In one embodiment, between the processing of the injection molding slot and the antenna slot on the intermediate frame preliminary form and the injection processing of the intermediate frame preliminary form, the step further includes: surface treatment of the metal intermediate frame. Nano-corrosion to improve the bonding rate between the metal and the injection molding material of the preliminary shape of the middle frame.

In one of the embodiments, the step of finishing the composite frame body includes finishing the front surface of the composite frame body and finishing the back surface of the composite frame body; When performing precise machining on the front side of the frame body, an outer edge stress groove is opened on the skirt edge of the composite frame body; when performing precise machining on the reverse side of the composite frame body, opening on the skirt edge of the composite frame body Secondary outer edge stress groove to further relieve stress and improve flatness effect.

In one embodiment, the step of finishing the composite frame body includes finishing the back surface of the composite frame body, and when finishing the back surface of the composite frame body, the third fixture The platform fixes the composite frame body through the fixed part retained on the edge of the composite frame body, and the third clamping platform adsorbs the front surface of the composite frame body through the vacuum suction cup, thereby improving the front surface of the composite frame body and the first The degree of fit between the supporting surfaces of the three-clamp platform improves the flatness after processing.

In one embodiment, the step of finishing the composite frame body includes finishing the edge of the composite frame body; when finishing the edge of the composite frame body, the fourth fixture The platform provides point support to the edge of the composite frame, so as to avoid the deformation of the composite frame caused by the accumulation of metal chips on the platform of the fourth fixture.

In one embodiment, the step of finishing the composite frame body includes finishing the edge of the composite frame body, and when finishing the edge of the metal middle frame; the composite frame body is subjected to finishing processing. The frame body is placed on the fourth fixture platform, and a metal cover plate is placed above the composite frame body. The electromagnet in the fourth fixture platform generates a magnetic force on the metal cover plate to avoid the processing of the edge of the composite frame body. cause an impact.

In one embodiment, the finishing processing on the composite frame body includes finishing processing on the edge of the composite frame body; when the finishing processing on the edge of the composite frame body is performed, the composite frame body is subjected to finishing processing on the edge of the composite frame body. The edge of the body that is prone to warping or sagging provides cutting compensation to ensure the flatness of the reverse side of the composite frame body.

A metal middle frame is prepared by using the above-mentioned processing method of the metal middle frame, so as to ensure the bonding effect between the metal middle frame and the edge of a screen or a battery cover.

Description of drawings

1 is a flow chart of main steps of a method for processing a metal middle frame according to a preferred embodiment of the present invention;

Fig. 2 is a flow chart of subsequent steps of the processing method of the metal middle frame shown in Fig. 1;

3A is a schematic perspective view of the front side of the middle frame preliminary shape after the front side preliminary processing is completed;

3B is a schematic view of the reverse side of the middle frame preliminary shape after the reverse side preliminary processing is completed;

FIG. 4 is a three-dimensional solid view of the initial shape of the middle frame and the first fixture platform after completing the processing of the injection molding slot and the antenna slot;

Fig. 5 is the three-dimensional solid view of the composite frame body and the second fixture platform of which the front surface is finished;

Fig. 6 is the three-dimensional solid view of the composite frame body and the third fixture platform whose reverse side is finished and processed;

FIG. 7 is a three-dimensional solid view of the metal middle frame and the fourth clamp platform after finishing the edge finishing process.

The corresponding relationship between each label and meaning in the accompanying drawings is:

Metal middle frame 300, middle frame preliminary shape 300a, composite frame body 300b, injection molding slot 301, antenna slot 302, primary outer edge stress slot 303, secondary outer edge stress slot 304;

(of the metal middle frame) the front face 31, the initial groove 311 on the front side, the upper boss 312, the rough positioning hole 313, the installation hole 314, and the accommodating groove 315;

(of the metal middle frame) the reverse side 32, the reverse side initial groove 321, the lower boss 322, the surface stress groove 323;

a first fixture platform 40, a first vacuum suction hole 401, a second fixture platform 500, and a second vacuum suction hole 501;

The third fixture platform 600, the vacuum suction cup 601;

The fourth clamp platform 700 , the support point 701 , the metal cover plate 702 , and the electromagnet 703 .

Detailed ways

In order to facilitate understanding of the present invention, the present invention will be described more fully below. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that a thorough and complete understanding of the present disclosure is provided.

Unless otherwise defined, 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 terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention.

Please refer to FIG. 1 to FIG. 7 , which are a method for processing a metal middle frame according to a preferred embodiment of the present invention, which is used for the processing and production of the metal middle frame. 1, the processing method of the metal middle frame includes the following steps:

S10: Provide metal profiles;

S11: Preliminary processing is carried out on the front side 31 and the back side 32 of the metal profile, respectively, the front side initial groove 311 is processed in the middle of the front side 31 of the metal profile, and the reverse side initial groove 321 is processed in the middle of the back side 32 of the metal profile to obtain a middle frame Initial 300a;

S12: Perform double-sided grinding on the preliminary model 300a of the middle frame;

S13: The injection molding slot 301 and the antenna slot 302 are processed on the middle frame preliminary shape 300a;

S14: performing injection molding on the preliminary middle frame 300a to obtain a composite frame body 300b;

S15: Finishing the composite frame body 300b to obtain a metal middle frame.

By performing preliminary processing on the front side 31 and the back side 32 of the metal profile before grinding and groove machining of the middle frame preliminary form 300a, the stress on the middle frame preliminary form 300a is generated by the positive side initial groove 311 and the reverse side initial groove 321 Therefore, the subsequent processing of the composite frame body 300b can avoid local deformation and affect the flatness effect due to the action of internal stress, and ensure that the metal middle frame 300 meets the assembly requirements.

For step S10, in this embodiment, a metal profile can be manufactured by an aluminum extrusion process. The aluminum extrusion process means that the aluminum material softened at high temperature flows through the aluminum extrusion die under the strong extrusion of the aluminum extrusion machine, and the shape meets the requirements. For aluminum profile products, this embodiment refers to extruding a metal sheet into a metal profile through an aluminum extrusion die. In other embodiments, the metal profile can also be manufactured by machining, that is, the metal sheet is processed by mechanical equipment to make its external dimensions meet the requirements, and the metal profile is formed.

In step S11, the metal profile is processed to form the middle frame preliminary form 300a of the preliminary structure.

Please refer to FIG. 3A and FIG. 3B , in order to avoid uneven grinding and affect the flatness due to the suspension of the middle part of the front surface 31 or the middle part of the reverse surface 32 during the double-sided grinding process of the middle frame preliminary shape 300a, a preliminary process is carried out on the front surface 31 of the metal profile. During processing, an upper boss 312 remains on the front side 31 of the metal profile; when preliminary processing is performed on the reverse side 32 of the metal profile, a lower boss 322 remains on the reverse side 32 of the metal profile; The height of the edge of the front 31 side of the metal profile is flush, and the surface of the lower boss 322 is flush with the edge of the back 32 side of the metal profile; thus, during the double-sided grinding process, from the middle of both sides to the middle frame preliminary shape 300a Provide support to ensure the flatness of the middle frame preliminary shape 300a after grinding.

Specifically, when the electronic device is assembled, the front side 31 of the metal middle frame 300 corresponds to the screen, and the reverse side 32 of the metal middle frame 300 corresponds to the battery cover.

Further, in order to chip the front surface 31 of the metal profile by a large-diameter chip cutter to improve efficiency, the gap between the upper bosses 312 is greater than 16 mm; the direction perpendicular to the front surface 31 or the back surface 32 of the metal profile is the Z-axis direction, The direction parallel to the long side of the metal profile is the Y-axis direction, and the direction parallel to the short side of the metal profile is the X-axis direction. In order to relieve stress and reduce deformation, in the preliminary processing of the front 31 of the metal profile, a margin of 0.28 is left in the Z-axis direction. ~0.42mm; in the preliminary processing of the front face 31 of the metal profile, a margin of 2.64 ~ 3.96mm is left in the X-axis or Y-axis direction. During the preliminary processing of the front side 31 of the metal profile, the reverse side 32 of the metal profile is used as the reference surface, and rough positioning holes 313 are processed on the metal profile; Realize the fixing of metal profiles.

In order to release the stress during the finishing process and reduce the deformation of the rear clamping position, in the preliminary processing of the reverse side 32 of the metal profile, a surface stress groove 323 is opened on the skirt of the metal profile, and the reverse side 32 of the preliminary shape 300a of the middle frame is reserved for 0.4-0.6mm The overall opening rough allowance is preferably 0.5mm. Specifically, the skirt edge is distributed along the edge of the middle frame preliminary form 300 a and protrudes outward relative to the final edge of the metal middle frame 300 .

For step S12, preferably, the grinding depth of one side of the middle frame preliminary form 300a is 0.2 mm.

Referring to FIG. 4 , for step S13, when cutting on the reverse side 32 of the middle frame preliminary form 300a, the middle frame preliminary form 300a is positioned with the rough positioning holes 313 on the middle frame preliminary form 300a, and the middle frame preliminary form 300a is used for positioning the middle frame preliminary form 300a. The front surface 31 of the middle frame is used as the reference plane, and the cylinder fixing mechanism fixes the edge of the middle frame preliminary form 300a; specifically, when cutting the reverse side 32 of the middle frame preliminary form 300a, the lower boss 322 is cut off at the same time.

When cutting on the front face 31 of the middle frame preliminary form 300a, the middle frame preliminary form 300a is positioned with the rough positioning holes 313 on the middle frame preliminary form 300a, and the back surface 32 of the middle frame preliminary form 300a is used as the reference plane, and the cylinder is fixed The mechanism is fixed through the corners of the middle frame preliminary form 300a; specifically, when the front surface 31 of the middle frame preliminary form 300a is cut, the upper boss 312 is cut off at the same time.

During the process of machining the injection slot 301 and the antenna slot 302 on the middle frame preliminary form 300a, the machining tool processes the front side 31 or the back side 32 of the middle frame preliminary form 300a from the inside to the outside along the zigzag path. Specifically, the injection molding slots 301 and the antenna slots 302 are distributed along the edge of the middle frame prototype 300a.

Further, in the step of processing the injection molding slot 301 and the antenna slot 302 on the front surface 31 of the middle frame preliminary form 300a, the first clamp platform 400 for supporting the middle frame preliminary form 300a is centered through the first vacuum suction hole 401. The reverse surface 32 of the frame prototype 300a is adsorbed, thereby improving the fit between the reverse surface 32 of the middle frame prototype 300a and the supporting surface of the first fixture platform 400 and improving the flatness after processing. Preferably, the first vacuum suction hole 401 is disposed close to the short side of the middle frame preliminary form 300a.

Further, in order to improve the bonding rate between the metal of the middle frame preliminary form 300a and the injection molding material, the processing method of the metal middle frame is to process the injection molding slot 301 and the antenna groove 302 on the frame preliminary form 300a in step S13 and step S13. S14 , before performing the injection molding process on the middle frame preliminary form 300a, further includes step S131, performing nano-etching on the surface of the middle frame preliminary form 300a, optionally, the corrosion amount is within 0.03 mm.

In step S14, injection molding is performed on the injection molding slot 301 and the antenna slot 302 of the middle frame preliminary form 300a, so as to provide support for the antenna part on the middle frame preliminary form 300a.

In step S15, finishing the composite frame body 300b includes:

Step S151: finishing the front surface 31 of the composite frame body 300b;

Step S152: finishing the back surface 32 of the composite frame body 300b;

Step S153: Finishing the edge of the composite frame body 300b.

Referring to FIG. 5, for step S151, corresponding mounting holes 314 and accommodating grooves 315 are precisely machined on the screen mounting surface of the front face 31 of the composite frame body 300b, so as to fix the screen or accommodate related electronic components when the intelligent electronic device is assembled; further Therefore, during the precise machining on the front surface 31 of the composite frame body 300b, the second clamp platform 500 for supporting the composite frame body 300b sucks the reverse surface 32 of the composite frame body 300b through the second vacuum suction hole 501, thereby improving the The degree of fit between the supporting surface of the two-clamp platform 500 and the reverse surface 32 of the composite frame body 300b improves the flatness after processing. Preferably, the second vacuum suction hole 501 is disposed opposite to the battery compartment on the reverse side 32 of the composite frame body 300b.

Further, when performing precise machining on the front surface 31 of the composite frame body 300b, an outer edge stress groove 303 is opened on the skirt edge of the composite frame body 300b to further relieve stress and improve the flatness effect. Preferably, four primary outer edge stress grooves 303 are correspondingly opened on each long side of the composite frame body 300b. The measured thickness is 1.32-1.98 mm; the inner wall of the primary outer edge stress groove 303 corresponding to the short side has a residual thickness of 2.8-4.2 mm relative to the final short side edge of the composite frame body 300b.

Further, in order to reduce the cutting amount of finishing the edge of the composite frame body 300b in step S153, and to avoid the deformation of the composite frame body 300b or the collapse of the TP plastic in step S153, in step S151, the skirt of the composite frame body 300b is The thickness allowance of the front surface 31 in the Z-axis direction is 0.16 to 0.24 mm.

Please refer to FIG. 6 , for step S152, the skirt of the composite frame body 300b is further processed, part of the fixing part is cut off, and the battery compartment and the peripheral area of the camera assembly area on the reverse side 32 of the composite frame body 300b are precisely processed, and further, in When the back surface 32 of the composite frame body 300b is precisely processed, a secondary outer edge stress groove 304 is formed on the skirt of the composite frame body 300b to further relieve stress and improve the flatness effect.

Further, in order to reduce the cutting amount of finishing the edge of the composite frame body 300b in step S153, and to avoid the deformation of the composite frame body 300b or the collapse of the TP plastic in step S153, in step S152, the skirt of the composite frame body 300b is The thickness allowance of the reverse surface 32 in the Z-axis direction is 0.4-0.6 mm, preferably, 0.5 mm.

Specifically, in step S152 , the third fixture platform 600 fixes the composite frame body 300b through the fixed portion remaining on the edge of the composite frame body 300b , and the third fixture platform 600 fixes the front surface 31 of the composite frame body 300b through the vacuum suction cup 601 . So as to improve the degree of fit between the front surface 31 of the composite frame body 300b and the support surface of the third fixture platform 600, and improve the flatness after processing.

Referring to FIG. 7 , in step S153, the redundant part of the edge of the composite frame body 300b is completely cut off to obtain a metal middle frame; when finishing the edge of the composite frame body 300b, the fourth fixture platform 700 is used for the composite frame body 300b. The edge portion of the bracket provides point support, and the metal chips generated by cutting are discharged between the support points 701 to avoid the deformation of the composite frame body 300b caused by the accumulation of metal chips on the fourth clamping platform 700 .

When finishing the edge of the composite frame body 300b, the composite frame body 300b is placed on the fourth fixture platform 700, a metal cover plate 702 is placed above the composite frame body 300b, and the electromagnet 703 in the fourth fixture platform 700 The metal cover plate 702 generates a magnetic force, so that the composite frame body 300b can be fixed on the fourth fixture platform 700 to avoid affecting the processing of the edge of the composite frame body 300b.

When finishing the edge of the composite frame body 300b, the edge of the composite frame body 300b is prone to be warped or sunk to provide cutting compensation; specifically, the area on the reverse side 32 of the composite frame body 300b where the edge is prone to sag is reduced. The cutting depth is required to ensure the flatness of the reverse surface 32 of the composite frame body 300b; optionally, the cutting depth can also be increased in the area where the edge of the reverse surface 32 of the composite frame body 300b is easily upturned.

Please refer to FIG. 2, further, according to the needs of different intelligent electronic devices, the processing method of the metal middle frame further includes the following steps:

S21 : machining a heat dissipation groove on the front surface 31 of the metal middle frame 300 to accommodate the heat dissipation pipe.

S22: machining side button holes and card slots on the side of the metal middle frame 300;

S23: finishing the front camera assembly area of the metal middle frame 300;

S24: machining a microphone hole on the metal middle frame 300;

S25: Machining a USB hole and a speaker hole on the metal middle frame 300;

S26: excising the temporary positioning part on the reverse side 32 of the metal middle frame 300;

The present invention also provides a metal middle frame 300, which is prepared by the above-mentioned processing method of the metal middle frame, and is suitable for intelligent electronic devices such as mobile phones and tablets, so as to ensure the bonding effect between the metal middle frame 300 and the edge of the screen or battery cover .

In this embodiment, by performing preliminary processing on the front and back surfaces of the metal profile before grinding and slot machining of the initial shape of the middle frame, the initial grooves on the front side and the initial grooves on the reverse side generate stress on the initial shape of the middle frame. Therefore, the subsequent processing of the composite frame body can avoid local deformation and affect the flatness effect due to the action of internal stress, and ensure that the metal middle frame meets the assembly requirements.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are more specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (9)

1. a processing method of a metal middle frame, is characterized in that, comprises the steps: Provide metal profiles; Preliminary machining is carried out on the front and back sides of the metal profile, and the front side initial groove is cut in the middle of the front side of the metal profile, and the reverse side initial groove is cut in the middle of the back side of the metal profile to obtain a middle frame. primary type; Double-sided grinding of the initial shape of the middle frame; The injection molding slot and the antenna slot are processed on the preliminary shape of the middle frame; Carrying out the injection molding process on the initial shape of the middle frame to obtain a composite frame body; Finishing the composite frame to obtain a metal middle frame; In the preliminary processing of the reverse side of the metal profile, a surface stress groove is formed on the skirt of the metal profile; the steps of processing the injection slot and the antenna slot on the middle frame preliminary shape are related to Surface nano-etching is performed on the intermediate frame preliminary form before the injection molding treatment step is performed on the intermediate frame preliminary form. 2 . The method for processing a metal middle frame according to claim 1 , wherein when the front side of the metal profile is preliminarily processed, an upper boss is reserved on the front side of the metal profile; During preliminary processing, a lower boss remains on the reverse side of the metal profile. 3 . The method for processing a metal middle frame according to claim 1 , wherein, in the step of processing injection molding slots and antenna slots on the front surface of the middle frame preliminary shape, it is used to support the metal middle frame. 4 . The first clamp platform of the metal frame absorbs the reverse side of the metal middle frame through the first vacuum suction hole; the step of finishing the composite frame body includes finishing the front surface of the composite frame body, and the When the front surface of the composite frame body is precisely processed, the second clamp platform for supporting the composite frame body sucks the reverse surface of the composite frame body through the second vacuum suction hole. 4 . The method for processing a metal middle frame according to claim 1 , wherein the step of performing finishing processing on the composite frame body comprises performing finishing processing on the front surface of the composite frame body and performing finishing processing on the composite frame body. 5 . The rear side of the frame body is subjected to finishing processing; when the front side of the composite frame body is precisely processed, an outer edge stress groove is opened on the skirt of the composite frame body; During precise machining, a secondary outer edge stress groove is opened on the skirt of the composite frame. 5 . The method for processing a metal middle frame according to claim 1 , wherein the step of performing finishing processing on the composite frame body comprises performing finishing processing on the reverse side of the composite frame body, and performing finishing processing on the composite frame body. 6 . When the reverse side of the frame body is subjected to finishing processing, the third clamp platform fixes the composite frame body through the fixed part retained on the edge of the composite frame body, and the third clamp platform fixes the composite frame body through the vacuum suction cup. Adsorption on the front. 6 . The method for processing a metal middle frame according to claim 1 , wherein the step of performing finishing processing on the composite frame body comprises performing finishing processing on the edge of the composite frame body; When the edge of the frame body is subjected to finishing processing, the fourth clamp platform provides point support for the edge portion of the composite frame body. 7 . The method for processing a metal middle frame according to claim 1 , wherein the step of performing finishing processing on the composite frame body comprises performing finishing processing on the edge of the composite frame body; When finishing the edge of the middle frame, the composite frame body is placed on the fourth fixture platform, a metal cover is placed above the composite frame body, and the electromagnet in the fourth fixture platform The cover plate generates a magnetic force. 8 . The method for processing a metal middle frame according to claim 1 , wherein finishing the composite frame body comprises performing finishing processing on the edge of the composite frame body; When finishing the edge of the composite frame body, cutting compensation is provided for the position on the edge of the composite frame body that is prone to warping or sagging. 9 . A metal middle frame, characterized in that, it is obtained by using the processing method for a metal middle frame according to any one of claims 1 to 8 .

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