Self-centering mobile phone middle frame cnc machining clamp

Abstract

This utility model discloses a self-centering CNC machining fixture for mobile phone mid-frames. The fixture core has a product placement area on its upper surface, and at least two positioning pins are installed in the product placement area, each protruding from the upper surface of the fixture core. Several pneumatic clamping mechanisms are installed around the product placement area. Through holes are formed in the fixture core corresponding to the positioning pins, with an anti-dislodgement shoulder at the upper opening of the through hole. The positioning pins are vertically and movably embedded in the through holes, and a pin shoulder is provided at the lower end of each positioning pin. A compression spring and a limiting pin are installed below the positioning pins in the through holes. The upper end of the compression spring elastically abuts against the positioning pin, and the lower end of the compression spring elastically abuts against the limiting pin. The upper end of the positioning pin is a conical positioning part. This utility model has the advantages of novel structural design and high positioning accuracy, and can effectively improve the CNC machining efficiency of mobile phone mid-frames.

Description

Technical Field

[0001] This utility model relates to the field of fixture technology, and in particular to a self-centering CNC machining fixture for mobile phone mid-frames. Background Technology

[0002] The Chinese utility model patent with patent number ZL202221875336.9 and patent name, entitled "A CNC Fixture for Processing the Front and Back Small A-Faces of a Mobile Phone Frame," essentially discloses a CNC machining fixture for a mobile phone frame. Specifically, the CNC fixture for processing the front and back small A-faces of a mobile phone frame discloses the following technical solution: A CNC fixture for processing the front and back small A-faces of a mobile phone frame includes a base plate. A horizontally arranged fixture plate is mounted on the upper end of the base plate, and the fixture plate is mounted on the upper end of the base plate via support blocks at both ends. At least two product positioning pins are provided on the upper end of the fixture plate. Horizontally arranged pressure blocks are arranged around the fixture plate, and horizontally arranged pressure block cylinders are mounted on the outer sides of the pressure blocks.

[0003] During the process of clamping and fixing the mobile phone mid-frame product using the CNC fixture for processing the front and back small A-sides of the mobile phone mid-frame, at least two product positioning pins are set on the upper end of the fixture plate to ensure accurate positioning of the mobile phone mid-frame product and prevent product misalignment; the pressure block presses the mobile phone mid-frame product around its perimeter under the action of the pressure block cylinder, thereby preventing product deformation, reducing the generation of defective products, and lowering production costs.

[0004] It should be noted that during the positioning of the mobile phone mid-frame product through product positioning, the product positioning pin is inserted into the positioning hole of the mobile phone mid-frame product, that is, the positioning of the mobile phone mid-frame product is achieved by the cooperation of the positioning pin and the positioning hole.

[0005] However, due to machining errors in the product positioning holes and assembly gaps between the product positioning holes and positioning pins, when the positioning pins are inserted into the positioning holes of the mobile phone mid-frame product, the aforementioned machining errors and assembly gaps will cause the mobile phone mid-frame product to wobble and shift when it is positioned on the fixture plate. To overcome the positioning errors of the positioning holes and positioning pins, a probe device needs to be added during actual CNC machining to detect and center the four sides of the mobile phone mid-frame product or the positioning holes, thereby ensuring that the product center is consistent with the program machining center. However, the aforementioned probe alignment process will significantly increase the machining time and reduce the efficiency of CNC machining. Utility Model Content

[0006] The purpose of this utility model is to provide a self-centering CNC machining fixture for mobile phone mid-frames to address the shortcomings of existing technologies. This self-centering CNC machining fixture for mobile phone mid-frames has a novel structural design, high positioning accuracy, and can effectively improve the CNC machining efficiency of mobile phone mid-frame products.

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution.

[0008] A self-centering CNC machining fixture for a mobile phone mid-frame includes a fixture core. The upper surface of the fixture core is provided with a product placement area for placing a mobile phone mid-frame product. At least two locating pins are installed in the product placement area of ​​the fixture core at intervals, and each locating pin protrudes from the upper surface of the fixture core.

[0009] The fixture mold core is equipped with several pneumatic clamping mechanisms arranged at intervals around the product placement area;

[0010] The fixture mold core has a vertical through hole corresponding to the positioning pin. The upper opening of the mold core through hole is provided with an anti-disengagement shoulder. The positioning pin is vertically and movably embedded in the mold core through hole, and the lower end of the positioning pin is provided with a pin shoulder located below the anti-disengagement shoulder.

[0011] A compression spring and a limiting pin are installed inside the through hole of the mold core below the positioning pin. The limiting pin is fastened to the lower end of the through hole of the mold core, the upper end of the compression spring elastically abuts against the positioning pin, and the lower end of the compression spring elastically abuts against the limiting pin.

[0012] The upper end of the locating pin is a conical locating part, and the outer diameter of the conical locating part gradually increases from top to bottom.

[0013] Wherein, the lower surface of the fixture mold core is screwed with a fixed vacuum suction block, a vacuum cavity is formed between the vacuum suction block and the fixture mold core, and the vacuum suction block has a vacuum through hole that communicates with the vacuum cavity and is connected to the vacuum equipment through a vacuum pipe.

[0014] The fixture mold core has several spaced and vertically penetrating mold core adsorption holes in the product placement area, and each mold core adsorption hole is connected to the vacuum chamber.

[0015] The lower end of the limiting pin is secured between the fixture mold core and the vacuum suction block.

[0016] A sealing ring is fitted between the fixture mold core and the vacuum suction block, surrounding the vacuum chamber.

[0017] The pneumatic clamping mechanism includes a cylinder mounting seat screwed onto the edge of the fixture mold core, and a vertically moving drive cylinder is screwed onto the cylinder mounting seat.

[0018] The pneumatic clamping mechanism also includes a movable pressure head, the inner end of which is the holding end, and the outer end of which is pivotally connected to the outer end of the piston rod of the drive cylinder via a pivot. An intermediate connecting rod is installed between the movable pressure head and the cylinder mounting seat. The upper end of the intermediate connecting rod is pivotally connected to the middle of the movable pressure head via a pivot, and the lower end of the intermediate connecting rod is pivotally connected to the cylinder mounting seat via a pivot.

[0019] The lower surface of the fixture mold core is screwed with two support blocks that are arranged side-by-side and spaced apart.

[0020] The upper surface of the fixture mold core is equipped with anti-fool pins in the product placement area.

[0021] Compared with existing technologies, this utility model has the following advantages: Specifically, when the mobile phone mid-frame product is positioned in the product placement area of ​​the fixture mold core, the positioning pin can automatically adjust the compression amount of the compression spring according to the size of the positioning hole, and always ensure that the positioning hole of the mobile phone mid-frame product and the positioning pin are centered and tightly fitted to achieve a self-centering function. This effectively prevents the problem of displacement and shaking of the mobile phone mid-frame product caused by inconsistent sizes of the incoming material for the positioning hole, thereby effectively improving CNC machining efficiency. Therefore, the self-centering mobile phone mid-frame CNC machining fixture of this utility model has the advantages of novel structural design and high positioning accuracy, and can effectively improve the CNC machining efficiency of mobile phone mid-frame products. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention.

[0023] Figure 1 This is a schematic diagram of the structure of this utility model.

[0024] Figure 2 This is a structural schematic diagram from another perspective of the present invention.

[0025] Figure 3 This is a structural diagram of the present invention when used to clamp and fix the middle frame of a mobile phone.

[0026] Figure 4 This is a partial cross-sectional view of the present invention when used to clamp and fix the middle frame of a mobile phone.

[0027] Figure 5 This is a schematic diagram of the pneumatic clamping mechanism of this utility model.

[0028] exist Figures 1 to 5 This includes:

[0029] 1- Fixture mold core; 11- Product placement area; 12- Mold core through hole; 13- Anti-detachment shoulder; 2- Positioning pin; 21- Pin shoulder; 22- Conical positioning part; 3- Cylinder clamping mechanism; 31- Cylinder mounting seat; 32- Drive cylinder; 33- Movable pressure head; 331- Holding end; 34- Intermediate connecting rod; 35- Pivot; 4- Compression spring; 5- Limiting pin; 61- Vacuum suction block; 62- Vacuum chamber; 63- Vacuum through hole; 64- Mold core adsorption through hole; 65- Sealing ring; 7- Support block; 8- Anti-foolproof pin; 9- Mobile phone frame product; 91- Positioning hole. Detailed Implementation

[0030] The present invention will now be described in conjunction with specific embodiments.

[0031] Example 1, as Figures 1 to 4 As shown, a self-centering CNC machining fixture for a mobile phone frame includes a fixture core 1. The upper surface of the fixture core 1 is provided with a product placement area 11 for placing a mobile phone frame product 9. At least two positioning pins 2 arranged at intervals are installed in the product placement area 11 of the fixture core 1, and each positioning pin 2 protrudes from the upper surface of the fixture core 1.

[0032] Among them, such as Figures 1 to 5 As shown, the fixture mold core 1 is equipped with several pneumatic clamping mechanisms arranged at intervals around the product placement area 11.

[0033] Furthermore, such as Figure 4 As shown, the fixture mold core 1 has a vertically penetrating mold core through hole 12 corresponding to the positioning pin 2. An anti-disengagement shoulder 13 is provided at the upper opening of the mold core through hole 12. The positioning pin 2 is vertically and movably embedded in the mold core through hole 12, and a pin shoulder 21 is provided at the lower end of the positioning pin 2, located below the anti-disengagement shoulder 13. Through the cooperation of the anti-disengagement shoulder 13 and the pin shoulder 21, this embodiment can effectively prevent the positioning pin 2 from exiting the mold core through hole 12.

[0034] Furthermore, such as Figure 4 As shown, a compression spring 4 and a limiting pin 5 are installed inside the through hole 12 of the mold core below the positioning pin 2. The limiting pin 5 is fastened to the lower end of the through hole 12 of the mold core. The upper end of the compression spring 4 elastically abuts against the positioning pin 2, and the lower end of the compression spring 4 elastically abuts against the limiting pin 5.

[0035] In addition, such as Figure 4 As shown, the upper end of the positioning pin 2 is a conical positioning part 22 in the shape of a cone, and the outer diameter of the conical positioning part 22 gradually increases from top to bottom.

[0036] In this embodiment, the positioning pins 2 cooperate with the positioning holes 91 of the mobile phone mid-frame product 9 to achieve product positioning. When the mobile phone mid-frame product 9 is placed in the product placement area 11 of the fixture mold core 1, each positioning pin 2 is inserted into the positioning hole 91 of the mobile phone mid-frame product 9. It should be noted that the positioning pins 2 in this embodiment can be vertically and movably installed in the mold core through hole 12 of the fixture mold core 1, and the positioning pins 2 are elastically held upward by the compression spring 4. Since the conical positioning part 22 of the positioning pin 2 is conical, when the mobile phone mid-frame product 9 is positioned in the product placement area 11 of the fixture mold core 1, the positioning pin 2 can automatically adjust the spring compression according to the size of the positioning hole 91, and always ensure that the positioning hole 91 of the mobile phone mid-frame product 9 and the positioning pin 2 are centered and tightly fitted to achieve a self-centering function. This can effectively prevent the mobile phone mid-frame product 9 from shifting and shaking due to the different sizes of the material in the positioning hole 91, thereby effectively improving the CNC machining efficiency.

[0037] When using the self-centering CNC machining fixture for the mobile phone frame in this embodiment to clamp and position the mobile phone frame product 9, the mobile phone frame product 9 is positioned and placed in the product placement area 11 of the fixture mold core 1 by the positioning pin 2, and the mobile phone frame product 9 is clamped and fixed by multiple cylinder clamping mechanisms 3.

[0038] In summary, the self-centering CNC machining fixture for mobile phone mid-frames in this embodiment has the advantages of novel structural design and high positioning accuracy, and can effectively improve the CNC machining efficiency of mobile phone mid-frame products.

[0039] Example 2, as Figure 2 and Figure 4 As shown, the difference between this embodiment 2 and embodiment 1 is that: the lower surface of the fixture mold core 1 is screwed with a fixed vacuum suction block 61, a vacuum chamber 62 is formed between the vacuum suction block 61 and the fixture mold core 1, and the vacuum suction block 61 has a vacuum through hole 63 that communicates with the vacuum chamber 62 and is connected to the vacuum equipment through a vacuum pipe.

[0040] The fixture mold core 1 has several mold core adsorption through holes 64 arranged at intervals and vertically penetrating in the product placement area 11, and each mold core adsorption through hole 64 is connected to the vacuum chamber 62.

[0041] When using the self-centering CNC machining fixture for the mobile phone mid-frame in this embodiment 2 to clamp and position the mobile phone mid-frame product 9, the mobile phone mid-frame product 9 is first positioned in the product placement area 11 of the fixture mold core 1 by the positioning pin 2. Then, the vacuum equipment is started and the vacuum chamber 62 is vacuumed. The vacuum chamber 62 generates negative pressure at this time and the mobile phone mid-frame product 9 is fixed by negative pressure adsorption through the several mold core adsorption through holes 64 of the fixture mold core 1. Then, the mobile phone mid-frame product 9 is pressed and fixed by the cylinder pressing mechanism 3.

[0042] Example 3, as Figure 4 As shown, the difference between this embodiment three and embodiment two is that the lower end of the limiting pin 5 is fixed between the fixture mold core 1 and the vacuum suction block 61.

[0043] Example 4, as Figure 4 As shown, the difference between this embodiment four and embodiment two is that a sealing ring 65 is fitted between the fixture mold core 1 and the vacuum suction block 61 and surrounds the vacuum chamber 62.

[0044] For the sealing ring 65 in this embodiment, it can effectively improve the airtightness of the vacuum chamber 62 during vacuuming operation, thereby improving the overall stability and reliability.

[0045] Example 5, as Figure 5 As shown, the difference between this fifth embodiment and the first embodiment is that the pneumatic clamping mechanism includes a cylinder mounting seat 31 screwed onto the edge of the fixture mold core 1, and a vertically moving drive cylinder 32 is screwed onto the cylinder mounting seat 31.

[0046] The pneumatic clamping mechanism also includes a movable pressure head 33. The inner end of the movable pressure head 33 is the holding end 331. The outer end of the movable pressure head 33 is pivotally connected to the outer end of the piston rod of the drive cylinder 32 via a pivot 35. An intermediate connecting rod 34 is installed between the movable pressure head 33 and the cylinder mounting seat 31. The upper end of the intermediate connecting rod 34 is pivotally connected to the middle of the movable pressure head 33 via a pivot 35, and the lower end of the intermediate connecting rod 34 is pivotally connected to the cylinder mounting seat 31 via a pivot 35.

[0047] When the cylinder clamping mechanism 3 clamps and fixes the mobile phone frame product 9, the drive cylinder 32 moves and pushes the outer end of the movable pressure head 33 upward. Since the middle part of the movable pressure head 33 is connected to the cylinder mounting seat 31 through the intermediate connecting rod 34, the pressing end 331 of the movable pressure head 33 presses the mobile phone frame product 9 downward.

[0048] Example 6, as Figures 1 to 5 As shown, the difference between this sixth embodiment and the first embodiment is that two support blocks 7 are screwed onto the lower surface of the fixture mold core 1, which are arranged in a left-right facing and spaced apart.

[0049] It should be noted that the fixture mold core 1 of this embodiment 6 can be mounted and fixed on the CNC machine tool worktable by two support blocks 7.

[0050] Example 7, as Figure 1 As shown, the difference between this embodiment seven and embodiment one is that the upper surface of the fixture mold core 1 is equipped with anti-fool pins 8 in the product placement area 11.

[0051] It should be explained that the mobile phone mid-frame product 9 has anti-fool pin holes. When the mobile phone mid-frame product 9 is placed in the product placement area 11 of the fixture mold core 1, the anti-fool pin 8 cooperates with the anti-fool pin holes to ensure that the mobile phone mid-frame product 9 is placed in the correct position.

[0052] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A self-centering CNC machining fixture for a mobile phone frame, comprising a fixture core (1), wherein the upper surface of the fixture core (1) is provided with a product placement area (11) for placing a mobile phone frame product (9), and the fixture core (1) is provided with at least two spaced positioning pins (2) in the product placement area (11), each positioning pin (2) protruding from the upper surface of the fixture core (1); The fixture mold core (1) is equipped with several pneumatic clamping mechanisms arranged at intervals on the periphery of the product placement area (11); Its features are: The fixture mold core (1) has a vertical through hole (12) corresponding to the positioning pin (2). The upper opening of the mold core through hole (12) is provided with an anti-disengagement shoulder (13). The positioning pin (2) is vertically and movably embedded in the mold core through hole (12), and the lower end of the positioning pin (2) is provided with a pin shoulder (21) located below the anti-disengagement shoulder (13). A compression spring (4) and a limiting pin (5) are installed inside the through hole (12) of the mold core below the positioning pin (2). The limiting pin (5) is fastened to the lower end of the through hole (12) of the mold core. The upper end of the compression spring (4) elastically abuts against the positioning pin (2), and the lower end of the compression spring (4) elastically abuts against the limiting pin (5). The upper end of the positioning pin (2) is a cone-shaped positioning part (22), and the outer diameter of the cone-shaped positioning part (22) gradually increases from top to bottom.

2. The self-centering CNC machining fixture for a mobile phone frame according to claim 1, characterized in that: The lower surface of the fixture mold core (1) is screwed with a fixed vacuum suction block (61), and a vacuum chamber (62) is formed between the vacuum suction block (61) and the fixture mold core (1). The vacuum suction block (61) has a vacuum through hole (63) that communicates with the vacuum chamber (62) and is connected to the vacuum equipment through a vacuum pipe. The fixture mold core (1) has several mold core adsorption through holes (64) arranged at intervals and vertically penetrating in the product placement area (11), and each mold core adsorption through hole (64) is connected to the vacuum chamber (62).

3. The self-centering CNC machining fixture for a mobile phone frame according to claim 2, characterized in that: The lower end of the limiting pin (5) is secured between the fixture mold core (1) and the vacuum suction block (61).

4. A self-centering CNC machining fixture for a mobile phone frame according to claim 2, characterized in that: A sealing ring (65) is fitted between the fixture mold core (1) and the vacuum suction block (61) and surrounds the vacuum chamber (62).

5. A self-centering CNC machining fixture for a mobile phone frame according to claim 1, characterized in that: The pneumatic clamping mechanism includes a cylinder mounting seat (31) screwed onto the edge of the clamp mold core (1), and a vertically moving drive cylinder (32) is screwed onto the cylinder mounting seat (31). The pneumatic clamping mechanism also includes a movable pressure head (33), the inner end of which is a pressing end (331), the outer end of which is pivotally connected to the piston rod extension of the drive cylinder (32) via a pivot (35), and an intermediate connecting rod (34) is installed between the movable pressure head (33) and the cylinder mounting seat (31). The upper end of the intermediate connecting rod (34) is pivotally connected to the middle of the movable pressure head (33) via a pivot (35), and the lower end of the intermediate connecting rod (34) is pivotally connected to the cylinder mounting seat (31) via a pivot (35).

6. A self-centering CNC machining fixture for a mobile phone frame according to claim 1, characterized in that: The lower surface of the fixture mold core (1) is screwed with two support blocks (7) that are facing each other from left to right and spaced apart.

7. A self-centering CNC machining fixture for a mobile phone frame according to claim 1, characterized in that: The upper surface of the fixture mold core (1) is fitted with anti-fool pins (8) in the product placement area (11).

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