A processing method for a wrapped flexible-rigid printed circuit board and a burr cleaning device used therefor

Abstract

The present invention provides a processing method for a wrapped rigid-flex printed circuit board and a burr cleaning device used therefor. In the processing method, a deburring process can be performed on the metal wrapping edge to prevent burrs from affecting subsequent processing and production, effectively improving the product quality. The burr cleaning device includes a base, a first vertical plate fixedly provided at one end of the base, and a roller grinding structure fixedly provided at the other end. A pushing structure is provided on one side of the roller grinding structure close to the first vertical plate. The pushing structure includes a second horizontal plate and a fourth horizontal plate. The second horizontal plate and the fourth horizontal plate are provided with guide grooves and laterally adjust the distance from the roller grinding structure through the guide grooves. The fourth horizontal plate can move vertically, and the distance between the second horizontal plate and the fourth horizontal plate can be adjusted. It can be adaptively adjusted according to the thickness of the circuit board and the width of the wrapping edge, so as to meet the processing of circuit boards of different specifications.

Description

Technical Field

[0001] The present invention relates to the field of rigid-flexible board production, and more specifically, to a burr cleaning device for a processing method of a wrapped rigid-flexible combined board. Background Art

[0002] With the development trend of thinning, integration, and multi-function of consumer electronic products, the requirements for the manufacturing process of printed circuit boards are getting higher and higher. The birth and development of FPC and PCB have given rise to a new product, the rigid-flexible circuit board. The rigid-flexible circuit board is a flexible circuit board and a rigid circuit board, which are combined together through processes such as lamination according to relevant process requirements to form a circuit board with the characteristics of FPC and PCB. It has the advantages of flexibility, three-dimensional wiring, and the ability to change shape according to space limitations, which reduces the use of connectors during the assembly of electronic products, greatly increases the reliability, reduces the product volume, significantly reduces the weight, and enables faster signal transmission.

[0003] In the production process of rigid-flexible circuit boards, metal wrapping is a common process step. In the existing processing technologies, most of them do not have a deburring step after the wrapping is formed, resulting in burrs on the product wrapping, which affects subsequent processing and use. Summary of the Invention

[0004] In order to overcome the defects of the prior art, the technical problem to be solved by the present invention is to provide a burr cleaning device for a processing method of a wrapped rigid-flexible combined board. In this method, a deburring process can be carried out on the metal wrapping to improve the product quality; and the adopted burr cleaning device can be adaptively adjusted according to the thickness of the circuit board and the width of the wrapping, so as to meet the processing of circuit boards of different specifications.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] The present invention provides a processing method for a wrapped rigid-flexible combined board, including the following steps:

[0007] S1. Cutting and baking: Select a flexible copper foil substrate and cut it on a cutting machine according to a preset size. After cutting, place it in an oven for baking and then cool it naturally.

[0008] S2. Drilling the flexible board: Drill holes according to the preset hole positions.

[0009] S3. Black hole: Form a conductive film on the inner wall of the drilled hole.

[0010] S4. Electroplating the flexible board: Place the board in an electroplating tank for electroplating.

[0011] S5. Inner layer image and etching: Use the principle of graphic transfer to make the inner layer circuit.

[0012] S6. Brownize the flexible board, roughen the copper surface and wire surface;

[0013] S7. CVL film lamination, using a double-sided laminating machine for film lamination;

[0014] S8. Stack the boards, press, punch holes, and trim the edges. Press the rigid board and the flexible board together with non-flowing PP glue, and perform conventional processes such as punching holes and trimming the edges;

[0015] S9. Drill holes in the rigid board at the corresponding positions;

[0016] S10. Metal edge wrapping for the rigid board edge;

[0017] S11. Electroplate the rigid board, place the board in the electroplating tank for electroplating;

[0018] S12. Outer layer image, etching, inspection. Use an exposure machine to transfer the required circuit image onto the board surface through a negative film. Then, make the required image circuit by developing, chemical etching, and stripping the film. Use the graphic transfer principle to make the outer layer circuit, and then use an AOI device to inspect the circuit;

[0019] S13. Tin plating to thicken the circuit;

[0020] S14. Deburring, use a deburring cleaning device to clean the burrs on the edge wrapping;

[0021] S15. Solder mask, make an image by screen printing ink, exposure, and development;

[0022] S16. Immersion gold, use ultrasonic waves and ammonia water for cleaning to remove metal impurities on the board surface;

[0023] S17. Open the cover, use a depth-controlled milling cutter to open the cover at the corresponding position with a fixed depth;

[0024] S18. UV forming of the flexible board, thermally press the rigid-flex board through UV;

[0025] S19. Inspection, packaging, warehousing.

[0026] Furthermore, in step S1, the empty baking temperature of the oven is 85°C to 89°C, and the duration is 12 minutes.

[0027] Furthermore, use a core substrate for the rigid board.

[0028] A burr cleaning device is also provided, comprising a base, a first vertical plate fixedly arranged at one end of the base, and a roller grinding structure fixedly arranged at the other end, wherein a pushing structure is provided on a side of the roller grinding structure close to the first vertical plate; the roller grinding structure comprises a support frame, wherein the support frame comprises two first horizontal plates arranged opposite to each other, and a second vertical plate fixedly arranged at one side of the two first horizontal plates close to the first vertical plate, a plurality of grinding rollers are arranged between the two first horizontal plates via a bearing frame, a side of the grinding roller away from the second vertical plate protrudes from a side of the first horizontal plate, the tops of the plurality of grinding rollers are connected by transmission via a chain sprocket assembly, and a bottom end rotating shaft of one of the grinding rollers is connected to an output shaft of a driving motor via a coupling;

[0029] The pushing structure includes a second cross plate, a third vertical plate fixedly arranged at one end of the second cross plate near the first vertical plate, a third cross plate at the top of the third vertical plate near one side of the second cross plate, two first lead screws are passed through the third cross plate and the second cross plate through bearings, the two first lead screws are symmetrically arranged about the length center of the third cross plate, a first slider is provided on the first lead screw, a fourth cross plate is fixedly mounted between the two first sliders, a guide groove is provided on the fourth cross plate and the second cross plate, the guide groove is open on the side away from the first lead screw, the second cross plate and the fourth cross plate slide along the two sides of the second vertical plate through the guide groove, and grinding sandpaper is fixedly pasted on the top surface of the second cross plate and the bottom surface of the fourth cross plate; a second lead screw is passed through the first vertical plate through a fixing nut, a clamping head is provided at one end of the second lead screw near the third vertical plate, a clamping slot is installed on the third vertical plate corresponding to the clamping head, the clamping head is rotatably matched with the clamping slot, and the rotating second lead screw drives the pushing structure to move.

[0030] Furthermore, a guide bar is fixedly provided on the top surface of the base, and the guide bar is parallel to the second screw. A guide seat is fixedly provided on the bottom surface of the second horizontal plate close to one end of the third vertical plate, and the bottom surface of the guide seat abuts against the top surface of the base, and the guide seat and the guide bar are slidably matched; the cross-section of the guide bar is a T-shaped structure, and the guide seat is adapted to the shape of the guide bar.

[0031] Furthermore, both ends of the second transverse plate and the fourth transverse plate close to the wall surface are provided with chamfers.

[0032] Furthermore, a first scale is engraved on the top side wall of the base along the length direction of the guide strip, and the accuracy of the first scale reaches a precision level of 0.1 mm.

[0033] Furthermore, a second scale is engraved on the end surface side wall of the third vertical plate close to the first scale, and the second scale is arranged vertically and has an accuracy level of 0.1 mm.

[0034] The beneficial effects of the present invention are as follows:

[0035] The present invention provides a method for processing a wrapped rigid-flex printed circuit board and a burr cleaning device used therefor. In the method, a deburring process can be performed on the metal wrapping edge to improve the product quality. The burr cleaning structure includes a roller grinding structure and a pushing structure. Under the action of two first lead screws, the pushing structure can drive the fourth cross plate to move vertically, thereby adjusting the distance between the fourth cross plate and the second cross plate to meet the processing requirements of printed circuit boards with different thicknesses. Under the action of the second lead screw, the pushing structure can adjust the positions among the grinding roller, the second cross plate, and the fourth cross plate, so that the distances from the edges of the second cross plate and the fourth cross plate to the grinding roller are adapted to the width of the metal wrapping edge, thus completing the burr grinding and cleaning and preventing damage to the printed circuit board, and adapting to different wrapping edge requirements. The above structural design and adjustment can be adaptively adjusted according to the thickness of the printed circuit board and the width of the wrapping edge, so as to meet the processing of printed circuit boards of different specifications. Description of the Drawings

[0036] Figure 1 is a schematic structural diagram of the burr cleaning device provided in the specific embodiment of the present invention;

[0037] Figure 2 is a top view of the cooperation between the roller grinding structure and the pushing structure provided in the specific embodiment of the present invention;

[0038] Figure 3 is a schematic diagram of the use state of the burr cleaning device provided in the specific embodiment of the present invention.

[0039] In the figure:

[0040] 100, base; 110, first vertical plate; 120, fixing nut; 130, guide bar; 140, first scale; 200, roller grinding structure; 210, first cross plate; 220, second vertical plate; 230, grinding roller; 240, drive motor; 300, pushing structure; 310, second cross plate; 311, guide seat; 320, third vertical plate; 321, card slot; 322, second scale; 330, third cross plate; 340, first lead screw; 350, first slider; 360, fourth cross plate; 370, guide groove; 380, grinding sandpaper; 390, second lead screw; 400, conveying table. Detailed Embodiments

[0041] The technical solutions of the present invention will be further described below with reference to the drawings and through specific embodiments.

[0042] The specific embodiment of the present invention discloses a method for processing a wrapped rigid-flex printed circuit board, including the following steps:

[0043] S1. Blanking and baking: Select a flexible copper foil substrate and blank it on a blanking machine according to the preset size. After blanking, place it in an oven for baking and then let it cool naturally.

[0044] S2. Soft board drilling: Drill holes according to the preset hole positions.

[0045] S3. Black hole formation: Form a conductive film on the inner wall of the drilled holes.

[0046] S4. Soft board electroplating: Place the board in an electroplating tank for electroplating.

[0047] S5. Inner layer image and etching: Use the principle of graphic transfer to make the inner layer circuit.

[0048] S6. Soft board brownification: Roughen the copper surface and the circuit surface.

[0049] S7. CVL film lamination: Use a double-sided laminating machine for film lamination.

[0050] S8. Stacking, pressing, punching, and trimming: Press the rigid board and the soft board together with non-flowing PP glue, and perform conventional punching and trimming processes.

[0051] S9. Rigid board drilling: Drill holes at the corresponding positions on the rigid board.

[0052] S10. Metal edge wrapping: Wrap the edge of the rigid board with metal.

[0053] S11. Rigid board electroplating: Place the board in an electroplating tank for electroplating.

[0054] S12. Outer layer image, etching, and inspection: Use an exposure machine to transfer the required circuit image onto the board surface through a negative film. Then, develop, chemically etch, and remove the film to make the required image circuit. Use the principle of graphic transfer to make the outer layer circuit, and then use AOI equipment for circuit inspection.

[0055] S13. Tin plating: Tin plate the circuit to thicken it.

[0056] S14. Deburring: Use a deburring device to clean the burrs on the edge wrapping.

[0057] S15. Solder mask: Make an image through screen printing of ink, exposure, and development.

[0058] S16. Immersion gold plating: Clean the board surface using ultrasonic waves in combination with ammonia water to remove metal impurities on the board surface.

[0059] S17. Cover opening: Use a depth-controlled milling cutter to open the cover at the corresponding position with a fixed depth.

[0060] S18. Soft board UV forming: Thermally press the rigid-flex board through UV to form it.

[0061] S19. Detection, packaging, and warehousing.

[0062] Further, in step S1, the empty-baking temperature of the oven is 85°C to 89°C, and the duration is 12 minutes.

[0063] Further, a core substrate is adopted for the rigid board.

[0064] As Figure 1 , Figure 2 shown, the present invention also discloses a burr cleaning device, including a base 100, a first vertical plate 110 fixedly provided at one end of the base 100, and a roller grinding structure 200 fixedly provided at the other end. A pushing structure 300 is provided on one side of the roller grinding structure 200 close to the first vertical plate 110; the roller grinding structure 200 includes a support frame, the support frame includes two relatively arranged first horizontal plates 210, and second vertical plates 220 fixedly provided on one side of the two first horizontal plates 210 close to the first vertical plate 110. A plurality of grinding rollers 230 are arranged between the two first horizontal plates 210 through bearings. One side of the grinding roller 230 away from the second vertical plate 220 protrudes from one side of the first horizontal plate 210. The tops of the plurality of grinding rollers 230 are connected by a chain and sprocket assembly. The bottom end rotating shaft of one of the grinding rollers 230 is connected to the output shaft of a driving motor 240 through a coupling; the pushing structure 300 includes a second horizontal plate 310, a third vertical plate 320 fixedly provided at one end of the second horizontal plate 310 close to the first vertical plate 110, a third horizontal plate 330 on the top of the third vertical plate 320 close to one side of the second horizontal plate 310. Two first lead screws 340 are arranged between the third horizontal plate 330 and the second horizontal plate 310 through bearings. The two first lead screws 340 are symmetrically arranged about the length center of the third horizontal plate 330. A first slider 350 is provided on the first lead screw 340. A fourth horizontal plate 360 is fixedly arranged between the two first sliders 350. Guide grooves 370 are provided on both the fourth horizontal plate 360 and the second horizontal plate 310. One side of the guide groove 370 away from the first lead screw 340 is open. The second horizontal plate 310 and the fourth horizontal plate 360 slide along both sides of the second vertical plate 220 through the guide grooves 370. Grinding sandpapers 380 are fixedly pasted on the top surface of the second horizontal plate 310 and the bottom surface of the fourth horizontal plate 360; a second lead screw 390 is arranged on the first vertical plate 110 through a fixing nut 120. A chuck is provided at one end of the second lead screw 390 close to the third vertical plate 320. A clamping groove 321 is arranged on the third vertical plate 320 corresponding to the chuck. The chuck is rotationally matched with the clamping groove 321. The rotating second lead screw 390 drives the pushing structure 300 to move.

[0065] The above-mentioned burr cleaning device includes a roller shaft grinding structure 200 and a pushing structure 300. The pushing structure 300 can drive the fourth cross plate 360 to move vertically under the action of two first lead screws 340, so as to adjust the distance between the fourth cross plate 360 and the second cross plate 310, meeting the processing requirements of printed circuit boards with different thicknesses. And the pushing structure can adjust the positions among the grinding roller 230, the second cross plate 310 and the fourth cross plate 360 under the action of the second lead screw 390, making the distances from the edges of the second cross plate 310 and the fourth cross plate 360 to the grinding roller 230 match the width of the metal edge. In this way, burr grinding and cleaning can be completed, and damage to the printed circuit board can be prevented, adapting to different edge requirements. The above structural design and adjustment can be adaptively adjusted according to the thickness of the printed circuit board and the width of the edge, so as to meet the processing of printed circuit boards of different specifications. It should be noted that as Figure 3 shown, a conveying table 400 is used in combination. The conveying table 400 is placed on one side of the burr cleaning structure, and the top surface of the conveying table 400 is flush with the top surface of the second cross plate 310, so as to drive the printed circuit board to move and rub against the abrasive paper 380 and the grinding roller 230 to clean the burrs.

[0066] Furthermore, a guiding strip 130 is fixedly arranged on the top surface of the base 100. The guiding strip 130 is parallel to the second lead screw 390. One end of the bottom surface of the second cross plate 310 close to the third vertical plate 320 is fixedly provided with a guiding seat 311. The bottom surface of the guiding seat 311 abuts against the top surface of the base 100. The guiding seat 311 is in sliding fit with the guiding strip 130. The cross section of the guiding strip 130 is a T-shaped structure, and the guiding seat 311 is adapted to the shape of the guiding strip 130. This structural design can further limit the moving track of the support frame, realize stable and precise movement, and facilitate alignment and position adjustment.

[0067] Furthermore, chamfers are provided at both ends of the mutually approaching wall surfaces of the second cross plate 310 and the fourth cross plate 360. This structural design can facilitate the smooth insertion of the printed circuit board, so as to perform grinding and deburring.

[0068] Furthermore, a first scale 140 is engraved on the top side wall of the base 100 along the length direction of the guiding strip 130, and the accuracy of the first scale 140 reaches the 0.1 mm accuracy level. A second scale 322 is engraved on the end side wall of the third vertical plate 320 close to the first scale 140. The second scale 322 is arranged vertically and its accuracy reaches the 0.1 mm accuracy level. This structural design can visually display the alignment, facilitating precise adjustment and alignment.

[0069] The present invention is described by way of preferred embodiments. Those skilled in the art will appreciate that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited by the specific embodiments disclosed herein, and other embodiments falling within the scope of the claims of this application belong to the scope of protection of the present invention.

Claims

1. A burr cleaning device for processing hard-soft board with hemming. Features: The invention comprises a base (100), a first vertical plate (110) fixedly arranged at one end of the base (100), and a roller grinding structure (200) fixedly arranged at the other end, wherein a pushing structure (300) is arranged on a side of the roller grinding structure (200) close to the first vertical plate (110); the roller grinding structure (200) comprises a support frame, wherein the support frame comprises two first horizontal plates (210) arranged opposite to each other, and a second vertical plate (220) fixedly arranged on a side of the two first horizontal plates (210) close to the first vertical plate (110), wherein a plurality of grinding rollers (230) are arranged between the two first horizontal plates (210) via a bearing frame, wherein a side of the grinding roller (230) away from the second vertical plate (220) protrudes from a side of the first horizontal plate (210), and the tops of the plurality of grinding rollers (230) are connected in transmission via a chain sprocket assembly, and a bottom end rotation shaft of one of the grinding rollers (230) is connected to an output shaft of a driving motor (240) via a coupling; The pushing structure (300) comprises a second transverse plate (310), a third vertical plate (320) fixedly arranged at one end of the second transverse plate (310) close to the first vertical plate (110), and a third transverse plate (330) at the top of the third vertical plate (320) close to the second transverse plate (310). Two first lead screws (340) are arranged between the third transverse plate (330) and the second transverse plate (310) via bearings. The two first lead screws (340) are symmetrically arranged about the length center of the third transverse plate (330). A first slider (350) is arranged on the first lead screw (340). A fourth transverse plate (360) is fixedly arranged between the two first sliders (350). The fourth transverse plate (360) and the second transverse plate (310) are both provided with guide grooves (370). The guide groove (370) is open at a side away from the first lead screw (340); the second transverse plate (310) and the fourth transverse plate (360) slide along the two sides of the second vertical plate (220) through the guide groove (370); the top surface of the second transverse plate (310) and the bottom surface of the fourth transverse plate (360) are fixedly attached with sandpaper (380); a second lead screw (390) is passed through the first vertical plate (110) via a fixing nut (120); a clamping head is provided at one end of the second lead screw (390) close to the third vertical plate (320); a clamping slot (321) is installed on the third vertical plate (320) corresponding to the clamping head; the clamping head and the clamping slot (321) are rotatably matched, and the rotating second lead screw (390) drives the pushing structure (300) to move.

2. A burr cleaning device for processing edge-wrapped hard-soft boards according to claim 1, Features: The top surface of the base (100) is fixedly provided with a guide bar (130), the guide bar (130) is parallel to the second lead screw (390), one end of the bottom surface of the second horizontal plate (310) close to the third vertical plate (320) is fixedly provided with a guide seat (311), the bottom surface of the guide seat (311) abuts against the top surface of the base (100), and the guide seat (311) is slidably matched with the guide bar (130); the cross section of the guide bar (130) is a T-shaped structure, and the shape of the guide seat (311) is adapted to that of the guide bar (130).

3. The burr cleaning device for processing the edge-bonded flexible-rigid printed circuit board according to claim 2, characterized in that: Both ends of the mutually adjacent wall surfaces of the second horizontal plate (310) and the fourth horizontal plate (360) are provided with chamfers.

4. The burr cleaning device for processing the edge-bonded flexible-rigid printed circuit board according to claim 3, characterized in that: A first scale (140) is engraved on the top side wall of the base (100) along the length direction of the guide bar (130), and the accuracy of the first scale (140) reaches the 0.1 mm accuracy level.

5. The burr cleaning device for processing the edge-bonded flexible-rigid printed circuit board according to claim 4, characterized in that: A second scale (322) is engraved on the end side wall of the third vertical plate (320) close to the first scale (140), the second scale (322) is arranged vertically, and the accuracy reaches the 0.1 mm accuracy level.

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