Integrated metal mobile phone middle frame CNC machining clamping fixture

Abstract

The invention relates to the field of mobile phone part machining, and particularly discloses an integrated metal mobile phone middle frame CNC machining clamping fixture which comprises a fixed top frame. The adjusting top seat device is connected with the fixed top frame; the positioning frame device is connected with the side, away from the fixed top frame, of the top seat adjusting device; the auxiliary positioning device is connected with the interior of the positioning frame device; the limiting correction device is connected with the positioning frame device; the built-in tensioning device is connected with the auxiliary positioning device; wherein the built-in tensioning device comprises a middle rack device, an auxiliary positioning device, a tensioning device and a tensioning device, and the middle rack device is connected with the auxiliary positioning device; the tensioning rod device is connected with the centrally-arranged frame device, the clamping fixture achieves precise positioning, and horizontal and position precision is guaranteed through multi-link correction; elastic and adsorption positioning prevents damage and intelligently senses abnormity. Inner and outer side machining switching is convenient, and the universality limitation of a traditional clamp is optimized.

Description

Technical Field

[0001] The invention relates to the mobile phone parts processing industry, in particular to an integrated metal mobile phone middle frame CNC processing clamping fixture. Background Art

[0002] With the rapid development of smartphone manufacturing technology, metal mobile phone frames have become the preferred material for many high-end mobile phones due to their excellent texture, strength and good heat dissipation performance. The integrated metal mobile phone frame has significant advantages in structural integrity and aesthetics, but its processing difficulty has also increased significantly.

[0003] In the process of CNC machining the integrated metal mobile phone middle frame, the clamping fixture plays a key role. Traditional fixtures often cannot meet the processing requirements of high precision and high stability. On the one hand, the structure of the integrated metal mobile phone middle frame is complex, usually with irregular contours, including multiple arcs, bends and fine internal cavity structures. Traditional general fixtures cannot accurately adapt to these complex shapes, which makes it easy for the middle frame to be inaccurately positioned during processing, resulting in processing size deviations, seriously affecting the product qualification rate and increasing production costs. On the other hand, metal cutting processing will generate a large cutting force. Due to the uneven distribution of the clamping force of traditional fixtures, the mobile phone middle frame is very easy to displace and deform during the processing process, especially when processing thin-walled parts or fine structures. Minor deformation may cause the middle frame to be scrapped. Moreover, when frequently changing the processing tasks of the middle frames of different models of mobile phones, the versatility of traditional fixtures is poor, and the adjustment is cumbersome and time-consuming, which seriously reduces production efficiency and cannot adapt to the current industrial model of rapid iteration and multi-batch small-batch production of mobile phones.

[0004] In summary, there is an urgent need for a new CNC machining clamping fixture specifically for the integrated metal mobile phone middle frame to solve a series of problems faced in the current machining process. Summary of the invention

[0005] The purpose of the present invention is to provide an integrated metal mobile phone middle frame CNC processing clamping fixture to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An integrated metal mobile phone middle frame CNC processing clamping fixture, comprising:

[0008] Fixed top frame;

[0009] An adjustable top seat device, wherein the adjustable top seat device is connected to the fixed top frame;

[0010] A positioning frame device, the positioning frame device is connected to a side of the adjusting top seat device away from the fixed top frame;

[0011] An auxiliary positioning device, which is connected to the interior of the positioning frame device and is used to cooperate with the positioning frame device to complete the dual positioning of the mobile phone middle frame;

[0012] A position limiting correction device, which is connected to the positioning frame device and is used for inserting and limiting the middle frame of the mobile phone;

[0013] A built-in tensioning device, wherein the built-in tensioning device is connected to the auxiliary positioning device;

[0014] Wherein, the built-in tensioning device comprises:

[0015] A center rack device, wherein the center rack device is connected to the auxiliary positioning device;

[0016] The tension rod device is connected to the center frame device and is used to cooperate with the center frame device to complete the internal clamping of the mobile phone middle frame.

[0017] Compared with the prior art, the invention has the following beneficial effects: the clamping fixture realizes precise positioning, and multi-link correction guarantees horizontal and positional accuracy; elastic and adsorption positioning prevents damage, and intelligently senses abnormalities. The inner and outer processing switches are convenient, and the multi-angle adjustment is flexible and adaptable. The all-round limit clamping is stable, which optimizes the universal limitations of traditional clamps. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a CNC machining clamping fixture for an integrated metal mobile phone middle frame in an embodiment of the present invention.

[0019] Figure 2 for Figure 1 Schematic diagram of the local structure at point A in the middle.

[0020] Figure 3 It is a structural schematic diagram of a limit correction device in a clamping fixture for CNC processing of an integrated metal mobile phone middle frame in an embodiment of the present invention.

[0021] Figure 4 It is a structural schematic diagram of a center frame device in a CNC processing clamping fixture for an integrated metal mobile phone middle frame in an embodiment of the present invention.

[0022] In the figure: 1-fixed top frame, 2-adjustable top seat device, 3-positioning frame device, 4-auxiliary positioning device, 5-limit correction device, 6-built-in tensioning device, 7-mid-frame device, 8-tensioning rod device, 201-adjustable rack seat, 202-connecting shaft seat, 203-linking rod, 204-first driving member, 205-sleeve frame, 301-connecting seat, 302-second driving member, 303-arc positioning frame, 304-first elastic member, 30 5-buffer ball, 401-fixed frame, 402-top frame, 403-second elastic member, 404-suction cup member, 501-correction frame, 502-correction groove, 503-third driving member, 504-bottom plate, 505-buffer pad, 701-fourth driving member, 702-fifth driving member, 703-middle frame, 704-sixth driving member, 705-limiting plate, 706-seventh driving member, 801-eighth driving member, 802-buffer roller. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] An integrated metal mobile phone middle frame CNC processing clamping fixture, in one embodiment of the present invention, such as Figure 1 As shown, it includes: a fixed top frame 1; an adjustable top seat device 2, the adjustable top seat device 2 is connected to the fixed top frame 1; a positioning frame device 3, the positioning frame device 3 is connected to the side of the adjustable top seat device 2 away from the fixed top frame 1; an auxiliary positioning device 4, the auxiliary positioning device 4 is connected to the inside of the positioning frame device 3, and is used to cooperate with the positioning frame device 3 to complete the double positioning of the mobile phone middle frame; a limit correction device 5, the limit correction device 5 is connected to the positioning frame device 3, and is used for inserting the mobile phone middle frame; a built-in tensioning device 6, the built-in tensioning device 6 is connected to the auxiliary positioning device 4; wherein, the built-in tensioning device 6 includes: a middle frame device 7, the middle frame device 7 is connected to the auxiliary positioning device 5; a tensioning rod device 8, the tensioning rod device 8 is connected to the middle frame device 7, and is used to cooperate with the middle frame device 7 to complete the internal clamping of the mobile phone middle frame.

[0025] In one embodiment of the present invention:

[0026] like Figure 1As shown, the adjusting top seat device 2 includes: an adjusting rack seat 201, the adjusting rack seat 201 is connected to the fixed top frame 1; a connecting shaft seat 202, the connecting shaft seat 202 is connected to the fixed top frame 1; a linkage rod 203, the linkage rod 203 is connected to the connecting shaft seat 202; a first driving member 204, the first driving member 204 is connected to the end of the linkage rod 203 away from the connecting shaft seat 202, and is meshed and connected with the adjusting rack seat 201; the first driving member 204 is an electric gear rack; a sleeve frame 205, the sleeve frame 205 is sleeved on the outer side of the bottom of the adjusting rack seat 201 away from the fixed top frame 1, and is connected to the linkage rod 203;

[0027] Insert the mobile phone middle frame to be processed into the two limit correction devices 5 at the bottom of the positioning frame device 3, and correct the insertion level of the mobile phone middle frame through the two limit correction devices 5 at the bottom. According to the specifications of the mobile phone middle frame, perform preliminary elastic positioning inside the positioning frame device 3, and then connect the top side of the mobile phone middle frame to the auxiliary positioning device 4, and perform secondary adsorption positioning through the auxiliary positioning device 4;

[0028] If it is necessary to process the inner side of the mobile phone middle frame, after positioning is completed by the positioning frame device 3 and the auxiliary positioning device 4, the built-in tensioning device 6 is rotated to the inside of the mobile phone middle frame, and after being clamped and fixed by the tensioning rod device 8, the inner side of the mobile phone middle frame is processed in cooperation with the CNC equipment (not shown in the figure). At the same time, when it is necessary to adjust the processing angle of the mobile phone middle frame, the first driving member 204 is operated, and the rack seat 201 is adjusted to drive the positioning frame device 3 to rotate axially, and the positioning frame device 3 and the internal mobile phone middle frame can be adjusted. The processing angle adjustment of the positioning frame device 3 and the mobile phone middle frame can be completed; if it is necessary to process the outer side of the mobile phone middle frame, after positioning by the positioning frame device 3, there is no need for the auxiliary positioning device 4 to position, and the built-in tensioning device 6 is adjusted. The internal tensioning and clamping of the mobile phone middle frame is realized by the tensioning rod device 8, and then the built-in tensioning device 6 and the tensioned and clamped mobile phone middle frame are rotated, and moved out of the positioning frame device 3 to expose the outer side of the mobile phone middle frame, waiting for subsequent CNC equipment to process.

[0029] In one embodiment of the present invention:

[0030] like Figure 1As shown, the positioning frame device 3 includes: a connecting seat 301, the connecting seat 301 is connected to the sleeve frame 205; a second driving member 302, the second driving member 302 is connected to the side of the connecting seat 301 away from the sleeve frame 205; the second driving member 302 uses an electric shaft seat; an arc-shaped positioning frame 303, the arc-shaped positioning frame 303 is connected to the side of the second driving member 302 away from the connecting seat 301; a plurality of first elastic members 304, a plurality of first elastic members 304 are connected to the inside of the arc-shaped positioning frame 303; the first elastic member 304 uses an elastic sensing telescopic rod; a buffer ball 305, the buffer ball 305 is connected to one end of the first elastic member 304 away from the arc-shaped positioning frame 303;

[0031] The buffer ball 305 is made of rubber material. When the mobile phone middle frame is inserted into the bottom limit correction device 5, it abuts against the buffer ball 305 at the corresponding position according to the shape and specification of the mobile phone middle frame, and cooperates with the first elastic member 304 to complete elastic multi-point clamping. The first elastic member 304 can sense the elastic information of each position. When the pressure at a certain buffer ball 305 point is abnormal, the processing is stopped to prevent the local clamping pressure of the mobile phone middle frame from being too large and damaging the mobile phone middle frame.

[0032] In one embodiment of the present invention:

[0033] like Figure 1 and Figure 2 As shown, the auxiliary positioning device 4 includes: a fixing frame 401, the fixing frame 401 is connected to the inside of the arc-shaped positioning frame 303; a top frame 402, the top frame 402 is connected to one end of the fixing frame 401 away from the arc-shaped positioning frame 303; a plurality of second elastic members 403, the plurality of second elastic members 403 are connected to a side of the top frame 402 away from the fixing frame 401; the second elastic member 403 uses an elastic sensing telescopic seat; a suction cup member 404, the suction cup member 404 is connected to a side of the second elastic member 403 away from the top frame 402; the suction cup member 404 uses a DC electromagnetic suction cup;

[0034] When the mobile phone middle frame is inserted into the arc-shaped positioning frame 303, the top side of the mobile phone middle frame abuts against the plurality of suction cup components 404, so that the plurality of second elastic components 403 sense the pressure information, send out control signals, control the operation of the suction cup components 404, and complete the adsorption and positioning of the mobile phone middle frame through the plurality of suction cup components 404.

[0035] In one embodiment of the present invention:

[0036] like Figure 1 and Figure 3As shown, the position limiting correction device 5 includes: a correction frame 501, the correction frame 501 is connected to the bottom side of the arc-shaped positioning frame 303; a correction slot 502, the correction slot 502 is arranged inside the correction frame 501; a third driving member 503, the third driving member 503 is connected to the inside of the correction frame 501; the third driving member 503 uses an electric telescopic frame; a bottom plate 504, the bottom plate 504 is connected to the third driving member 503, and is arranged inside the correction slot 502; a buffer pad 505, the buffer pad 505 is connected to the side of the bottom plate 504 away from the third driving member 503;

[0037] The width of the correction groove 502 should be similar to the thickness of the mobile phone middle frame. When the mobile phone middle frame is inserted into the correction grooves 502 on both sides, the mobile phone middle frame can be prevented from shifting in the direction perpendicular to the arc positioning frame 303. At the same time, according to the width of the mobile phone middle frame, the relative distance between the two side bottom plates 504 is adjusted by the third driving member 503 to prevent the mobile phone middle frame from shifting in the direction parallel to the arc positioning frame 303.

[0038] In one embodiment of the present invention:

[0039] like Figure 1 and Figure 4 As shown, the middle rack device 7 includes: a fourth driving member 701, the fourth driving member 701 is connected to the top frame 402; the fourth driving member 701 is an electric telescopic frame; a fifth driving member 702, the fifth driving member 702 is connected to the fourth driving members 701 on both sides; the fifth driving member 702 is an electric shaft; a middle rack 703, the middle rack 703 is fixedly connected with the fifth driving member 702; at least two groups of sixth driving members 704, the sixth driving member 704 is connected to the middle rack 703; the sixth driving member 704 is an electric shaft seat; a limiting plate 705, the limiting plate 705 is connected to the sixth driving member 704; a seventh driving member 706, the seventh driving member 706 is connected to the side of the middle rack 703 away from the fifth driving member 702; the seventh driving member 706 is an electric shaft seat;

[0040] When the mobile phone middle frame is positioned, the positions of the middle frame 703 and the tensioning rod device 8 are adjusted by the fourth driving member 701 and the fifth driving member 702, and the tensioning rod device 8 is moved into the mobile phone middle frame, and then the tensioning rod device 8 is used to complete the tensioning and clamping of the mobile phone middle frame. After the tensioning and clamping, under the drive of the sixth driving member 704, the limiting plates 705 on both sides are adjusted to be perpendicular to the middle frame 703, so that the limiting plates 705 on both sides are moved to both sides of the mobile phone middle frame, and the external position limiting of the mobile phone middle frame can be completed;

[0041] In the present application, the fourth driving member 701 is not limited to an electric telescopic frame, but can also be driven by a linear motor, an electric cylinder or a pneumatic cylinder, etc., as long as the movement adjustment of the fifth driving member 702 can be achieved, and no specific limitation is made here; the fifth driving member 702 is not limited to an electric shaft, but can also be driven by a linear motor, an electric cylinder or a pneumatic cylinder, etc., as long as the rotation adjustment of the center frame 703 can be achieved, and no specific limitation is made here; the sixth driving member 704 is not limited to an electric shaft seat, but can also be driven by a linear motor, an electric cylinder or a pneumatic cylinder, etc., as long as the rotation adjustment of the limit plate 705 can be achieved, and no specific limitation is made here; the seventh 706 driving member is not limited to an electric shaft seat, but can also be driven by a linear motor, an electric cylinder or a pneumatic cylinder, etc., as long as the rotation adjustment of the tensioning rod device 8 can be achieved, and no specific limitation is made here.

[0042] In one embodiment of the present invention:

[0043] like Figure 1 As shown, the tension rod device 8 includes: at least two eighth driving members 801, the eighth driving members 801 are fixedly connected to the seventh driving member 706, and are both arranged in the groove body on the side of the middle frame 703 away from the top frame 402; the eighth driving member 801 is a bidirectional electric telescopic rod; a buffer roller 802, and the buffer roller 802 is connected to one end of the eighth driving member 801 away from the seventh driving member 706;

[0044] The buffer roller 802 is made of rubber. When the two eighth driving members 801 are moved into the middle frame of the mobile phone, the expansion angles of the two eighth driving members 801 are synchronously adjusted by the seventh driving member 706. The eighth driving member 801 drives the buffer rollers 802 at both ends to move in opposite directions, so that the four buffer rollers 802 are in contact with the inner sides of the four corners of the middle frame of the mobile phone to complete the tensioning and clamping.

[0045] The working principle of the present invention is: insert the mobile phone middle frame to be processed into the two limit correction devices 5 at the bottom side of the positioning frame device 3, and perform the insertion level correction of the mobile phone middle frame through the two limit correction devices 5 at the bottom side. According to the specifications of the mobile phone middle frame, preliminary elastic positioning is performed inside the positioning frame device 3, and then the top side of the mobile phone middle frame is connected to the auxiliary positioning device 4, and secondary adsorption positioning is performed through the auxiliary positioning device 4;

[0046] If it is necessary to process the inner side of the mobile phone middle frame, after positioning is completed by the positioning frame device 3 and the auxiliary positioning device 4, the built-in tensioning device 6 is rotated to the inside of the mobile phone middle frame, and after being clamped and fixed by the tensioning rod device 8, the inner side of the mobile phone middle frame is processed in cooperation with the CNC equipment (not shown in the figure). At the same time, when it is necessary to adjust the processing angle of the mobile phone middle frame, the first driving member 204 is operated, and the rack seat 201 is adjusted to drive the positioning frame device 3 to rotate axially, and the positioning frame device 3 and the internal mobile phone middle frame can be adjusted. The processing angle adjustment of the positioning frame device 3 and the mobile phone middle frame can be completed; if it is necessary to process the outer side of the mobile phone middle frame, after positioning by the positioning frame device 3, there is no need for the auxiliary positioning device 4 to position, and the built-in tensioning device 6 is adjusted. The internal tensioning clamping of the mobile phone middle frame is realized by the tensioning rod device 8, and then the built-in tensioning device 6 and the tensioned mobile phone middle frame are rotated, and moved out of the positioning frame device 3 to expose the outer side of the mobile phone middle frame, waiting for subsequent CNC equipment to process, the buffer ball 305 is made of rubber material, and when the mobile phone middle frame is inserted into the bottom limit correction device According to the shape and specification of the mobile phone middle frame, the buffer ball 305 at the corresponding position is abutted, and the first elastic member 304 is matched to complete the elastic multi-point clamping, and the first elastic member 304 can sense the elastic information of each position. When the pressure of a buffer ball 305 point is abnormal, the processing is stopped to prevent the local clamping pressure of the mobile phone middle frame from being too large and damaging the mobile phone middle frame. When the mobile phone middle frame is inserted into the arc-shaped positioning frame 303, the top side of the mobile phone middle frame abuts against a plurality of suction cup members 404, so that a plurality of second elastic members 403 sense the pressure. The force information is sent out to control the operation of the suction cup member 404, and the suction positioning of the mobile phone middle frame is completed by a plurality of suction cup members 404. The width of the correction groove 502 should be similar to the thickness of the mobile phone middle frame. When the mobile phone middle frame is inserted into the correction grooves 502 on both sides, the mobile phone middle frame can be prevented from shifting in the direction perpendicular to the arc positioning frame 303. At the same time, according to the width of the mobile phone middle frame, the relative distance between the bottom plates 504 on both sides is adjusted by the third driving member 503 to prevent the mobile phone middle frame from shifting in the direction parallel to the arc positioning frame 303.

[0047] When the middle frame of the mobile phone is positioned, the positions of the center frame 703 and the tensioning rod device 8 are adjusted by the fourth driving member 701 and the fifth driving member 702, and the tensioning rod device 8 is moved into the middle frame of the mobile phone, and then the tensioning clamping of the middle frame of the mobile phone is completed by the tensioning rod device 8. After tensioning and clamping, under the drive of the sixth driving member 704, the limiting plates 705 on both sides are adjusted to a vertical state with the center frame 703, so that the limiting plates 705 on both sides are moved to both sides of the middle frame of the mobile phone, and the external limiting of the middle frame of the mobile phone can be completed. The buffer roller 802 is made of rubber material. When the two eighth driving members 801 are moved into the middle frame of the mobile phone, the expansion angle of the two eighth driving members 801 is synchronously adjusted by the seventh driving member 706, and the eighth driving member 801 drives the buffer rollers 802 at both ends to move back to back, so that the four buffer rollers 802 abut against the inner sides of the four corners of the middle frame of the mobile phone to complete the tensioning and clamping.

[0048] In summary, this clamping fixture achieves precise positioning, and multi-link correction guarantees horizontal and position accuracy; elastic and adsorption positioning prevents damage, and intelligently senses abnormalities. The inside and outside processing can be switched conveniently, and the multi-angle adjustment is flexible and adaptable. The all-round limit clamping is stable, which optimizes the universal limitations of traditional clamps.

[0049] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An integrated metal mobile phone middle frame CNC processing clamping fixture, characterized in that: include: Fixed top frame; An adjustable top seat device, wherein the adjustable top seat device is connected to the fixed top frame; A positioning frame device, the positioning frame device is connected to a side of the adjusting top seat device away from the fixed top frame; An auxiliary positioning device, which is connected to the interior of the positioning frame device and is used to cooperate with the positioning frame device to complete the dual positioning of the mobile phone middle frame; A position limiting correction device, which is connected to the positioning frame device and is used for inserting and limiting the middle frame of the mobile phone; A built-in tensioning device, wherein the built-in tensioning device is connected to the auxiliary positioning device; Wherein, the built-in tensioning device comprises: A center rack device, wherein the center rack device is connected to the auxiliary positioning device; The tension rod device is connected to the center frame device and is used to cooperate with the center frame device to complete the internal clamping of the mobile phone middle frame.

2. The integrated metal mobile phone middle frame CNC processing clamping fixture according to claim 1 is characterized in that: The adjustable top seat device comprises: An adjusting rack seat, wherein the adjusting rack seat is connected to a fixed top frame; A connecting shaft seat, wherein the connecting shaft seat is connected to the fixed top frame; A linkage rod, the linkage rod is connected to the connecting shaft seat; A first driving member, the first driving member is connected to an end of the linkage rod away from the connecting shaft seat, and is meshedly connected to the adjusting rack seat; the first driving member is an electric gear rack; The sleeve frame is sleeved on the outer side of the bottom of the adjusting rack seat away from the fixed top frame and is connected with the linkage rod.

3. The integrated metal mobile phone middle frame CNC processing clamping fixture according to claim 2 is characterized in that: The positioning frame device comprises: A connecting seat, the connecting seat is connected to the sleeve frame; A second driving member, the second driving member is connected to a side of the connecting seat away from the sleeve frame; An arc-shaped positioning frame, the arc-shaped positioning frame is connected to a side of the second driving member away from the connecting seat; A plurality of first elastic members, wherein the plurality of first elastic members are connected to the inside of the arc-shaped positioning frame; A buffer ball is connected to an end of the first elastic member away from the arc-shaped positioning frame.

4. The integrated metal mobile phone middle frame CNC processing clamping fixture according to claim 3 is characterized in that: The auxiliary positioning device comprises: A fixing frame connected to the inside of the arc-shaped positioning frame; A top frame connected to an end of the fixing frame away from the arc-shaped positioning frame; A plurality of second elastic members, wherein the plurality of second elastic members are connected to a side of the top frame away from the fixed frame; A suction cup member is connected to a side of the second elastic member away from the top frame.

5. The integrated metal mobile phone middle frame CNC processing clamping fixture according to claim 4 is characterized in that: The limit correction device comprises: A correction frame connected to the bottom side of the arc-shaped positioning frame; A correction slot, wherein the correction slot is arranged inside the correction frame; A third driving member, the third driving member is connected to the inside of the correction frame; A bottom plate, the bottom plate is connected to the third driving member and is arranged inside the correction groove; A buffer pad is connected to a side of the bottom plate away from the third driving member.

6. The integrated metal mobile phone middle frame CNC processing clamping fixture according to claim 4, characterized in that: The mid-mounted rack device comprises: a fourth driving member connected to the top frame; A fifth driving member, the fifth driving member being connected to the fourth driving members on both sides; A middle frame, wherein the middle frame is fixedly connected to the fifth driving member set; at least two groups of sixth driving members, wherein the sixth driving members are connected to the middle frame; a limit plate connected to the sixth driving member; The seventh driving member is connected to a side of the middle frame away from the fifth driving member.

7. The integrated metal mobile phone middle frame CNC processing clamping fixture according to claim 6, characterized in that: The tension rod device comprises: At least two eighth driving members, the eighth driving members are fixedly connected to the seventh driving member in a sleeve, and are both arranged in the slot body on the side of the middle frame away from the top frame; A buffer roller is connected to an end of the eighth driving member away from the seventh driving member.

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