Butt-joint drilling process for multilayer rigid-flex printed circuit board

Abstract

The invention discloses a multilayer rigid-flex board butt-joint drilling process, which is applied to a drilling tool and comprises the following steps: S1, detecting the size of a multilayer rigid-flex board, driving a first limiting block, a second limiting block, a third limiting block and a fourth limiting block to slide and adjust to enable the size of a loading space to adapt to the multilayer rigid-flex board, then the crimping assembly is driven to press the multi-layer rigid-flex board, and then the whole drilling tool is placed at a preset installation position of a drilling machine; s2, drilling is conducted for the first time, specifically, a first blind hole is drilled, and the drilling depth is 50% + 0.05 mm of the thickness of the product; s3, the drilling tool is taken out, and the drilling tool is turned over; and S4, secondary drilling is conducted, specifically, the number of drilling machines is two, the overturned tool is installed in the second drilling machine for drilling, a second blind hole is drilled, and the first blind hole and the second blind hole are communicated in the contra-rotating process.

Description

Technical Field

[0001] The invention relates to the technical field of circuit board manufacturing, and in particular to a butt-drilling process for a multi-layer rigid-flexible board. Background Art

[0002] During the production process of circuit boards, drilling is inevitable.

[0003] At present, when drilling holes in rigid-flex PCBs, holes are drilled from one side of the PCB. Due to the complex structure of multi-layer rigid-flex PCBs, the one-side drilling method is prone to overheating and wear of the drill bit, resulting in a short life of the drill bit. In the process of drilling, it will also cause problems such as pulling of the hole wall and drilling flash, which seriously affect product quality. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a multi-layer rigid-flex board butt drilling process, which uses a special tool to achieve effective drilling of the multi-layer rigid-flex board, reduce drill bit damage, and improve the quality of the circuit board.

[0005] A multi-layer rigid-flexible board docking drilling process according to an embodiment of the present invention is applied to a drilling tool, the drilling tool comprising a substrate, a first limit block, a second limit block, a third limit block and a fourth limit block, the substrate is used for an external drilling machine, a square avoidance opening is arranged in the middle of the substrate, the first limit block, the second limit block, the third limit block and the fourth limit block are distributed around the avoidance opening, the first limit block, the second limit block, the third limit block and the fourth limit block are all slidably arranged on the substrate, the first limit block, the second limit block, the third limit block and the fourth limit block define a loading space, the loading space is used to load the circuit board, the first limit block, the second limit block, the third limit block and the fourth limit block are all connected with a crimping assembly, the crimping assembly is used to press the multi-layer rigid-flexible board, and the process comprises the following steps:

[0006] S1, detecting the size of the multi-layer rigid-flex board, driving the first limit block, the second limit block, the third limit block and the fourth limit block to slide and adjust, so that the size of the loading space is adapted to the multi-layer rigid-flex board, and then driving the pressing assembly to press the multi-layer rigid-flex board, and then placing the entire drilling tooling at a predetermined installation position of the drilling machine;

[0007] S2, drilling for the first time, drilling a first blind hole, the drilling depth is 50% of the product thickness + 0.05mm, during the drilling process, the multi-layer rigid-flex board is cooled;

[0008] S3, taking out the drilling tool, and turning over the drilling tool after waiting for a predetermined time;

[0009] S4, the second drilling, two drilling machines are provided, the flipped tooling is loaded into the second drilling machine for drilling, the drilling method is the same as the step S2, the second blind hole is drilled, and the first blind hole and the second blind hole are connected during the rotation process.

[0010] A multi-layer rigid-flexible board docking drilling process according to an embodiment of the present invention has at least the following beneficial effects: in the docking drilling process, a special tooling is used to load the multi-layer rigid-flexible board, so that the multi-layer rigid-flexible board does not touch the human hand when flipping, and the tooling positions and fixes the multi-layer rigid-flexible board to reduce the influence of stress on the multi-layer rigid-flexible board, and the four slidable limit blocks arranged on the tooling can clamp the multi-layer rigid-flexible boards of different sizes to realize drilling processing of different multi-layer rigid-flexible boards, and two machines are used for continuous drilling to realize continuous drilling, avoid waiting time for drilling, and improve production efficiency, and the crimping assembly arranged fixes the multi-layer rigid-flexible board, improves the stability of the multi-layer rigid-flexible board, and improves the stability of drilling.

[0011] According to some embodiments of the present invention, the upper and lower ends of the first limit block, the second limit block, the third limit block and the fourth limit block are all connected to the crimping assembly, and the crimping assembly arranged up and down can more stably fix the multi-layer rigid-flex board.

[0012] According to some embodiments of the present invention, the crimping assembly includes a crimping arm and an elastic member, the crimping arm is rotatably connected to the corresponding first limit block, the second limit block, the third limit block and the fourth limit block, one end of the elastic member is connected to the corresponding crimping arm, and the other end of the elastic member is connected to the corresponding first limit block, the second limit block, the third limit block and the fourth limit block, the elastic member drives the crimping arm to press the multi-layer rigid-flex board, and the crimping assembly has a simple structure and is easy to install and operate.

[0013] According to some embodiments of the present invention, the elastic member includes a coil spring or a spring.

[0014] According to some embodiments of the present invention, the first limit block, the second limit block, the third limit block and the fourth limit block are all provided with card slots, and the card slots are used to card the edges of the multi-layer rigid-flexible board. The provision of the card slots enables the multi-layer rigid-flexible board to be fixed and carded more stably to meet the drilling requirements.

[0015] According to some embodiments of the present invention, a buffer pad is installed at the bottom of the card slot, and the buffer pad is provided to prevent the multi-layer rigid-flex board from being torn or squeezed and deformed when drilling.

[0016] According to some embodiments of the present invention, in step S2, air is extracted for circulation cooling during drilling.

[0017] According to some embodiments of the present invention, step S5 is further included, wherein after the first blind hole and the second blind hole are connected, they are left for a predetermined time, and then burrs are drilled on the connected through hole.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 A schematic diagram of a drilling tool according to an embodiment of the present invention;

[0021] Figure 2 for Figure 1 An exploded view of the drilling tool is shown;

[0022] Figure 3 for Figure 1 A schematic diagram of a crimping assembly on a drilling tool is shown;

[0023] Figure 4 Schematic diagram of drilling the first blind hole in a multi-layer rigid-flex board;

[0024] Figure 5 Schematic diagram of drilling a second blind hole in a multi-layer rigid-flex board;

[0025] Figure 6 Schematic diagram of the first blind hole and the second blind hole drilled in a multi-layer rigid-flex PCB.

[0026] Drilling tool 100, slot 100a, buffer pad 100b;

[0027] A first limiting block 110, a second limiting block 120, a third limiting block 130, and a fourth limiting block 140;

[0028] Base plate 150, avoidance opening 151, loading space 160;

[0029] The crimping assembly 200, the crimping arm 210, and the elastic member 220;

[0030] Multilayer rigid-flex board 300 , first blind via 310 , and second blind via 320 . DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In the description of the present invention, "several" means one or more, "more" means two or more, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0034] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0035] Reference Figures 1 to 6According to an embodiment of the present invention, a multi-layer rigid-flex board butt-jointed drilling process is applied to a drilling tool 100, which includes a substrate 150, a first limit block 110, a second limit block 120, a third limit block 130 and a fourth limit block 140. The substrate 150 is used for externally connecting a drilling machine. A square avoidance opening 151 is provided in the middle of the substrate 150. The first limit block 110, the second limit block 120, the third limit block 130 and the fourth limit block 140 are distributed around the avoidance opening 151. The first limit block 110, the second limit block 120, the third limit block 130 and the fourth limit block 140 are distributed around the avoidance opening 151. 0, the second limit block 120, the third limit block 130 and the fourth limit block 140 are all slidably arranged on the substrate 150, the first limit block 110, the second limit block 120, the third limit block 130 and the fourth limit block 140 define a loading space 160, the loading space 160 is used to load the circuit board, the first limit block 110, the second limit block 120, the third limit block 130 and the fourth limit block 140 are all connected with a crimping assembly 200, and the crimping assembly 200 is used to press the multi-layer rigid-flexible board 300.

[0036] Specifically, the multi-layer rigid-flex board docking drilling process includes the following steps:

[0037] S1, detect the size of the multi-layer rigid-flex board 300, drive the first limit block 110, the second limit block 120, the third limit block 130 and the fourth limit block 140 to slide and adjust, so that the size of the loading space 160 is adapted to the multi-layer rigid-flex board 300, then drive the crimping assembly 200 to press the multi-layer rigid-flex board 300, and then place the entire drilling tool 100 to the predetermined installation position of the drilling machine;

[0038] S2, drilling for the first time, drilling a first blind hole 310, the drilling depth is 50% of the product thickness + 0.05mm, during the drilling process, the multi-layer rigid-flex board 300 is cooled;

[0039] S3, taking out the drilling tool 100, and turning over the drilling tool 100 after waiting for a predetermined time;

[0040] S4, the second drilling, two drilling machines are provided, the turned tooling is loaded into the second drilling machine for drilling, the drilling method is the same as step S2, the second blind hole 320 is drilled, and the first blind hole 310 and the second blind hole 320 are connected during the counter-rotation process.

[0041] It should be understood that in the drilling process, a special tooling is used to load the multi-layer rigid-flexible board 300, so that the multi-layer rigid-flexible board 300 does not touch the human hand when it is flipped. The tooling positions and fixes the multi-layer rigid-flexible board 300 to reduce the influence of stress on the multi-layer rigid-flexible board 300, and the four sliding limit blocks arranged on the tooling can clamp the multi-layer rigid-flexible boards 300 of different sizes to realize the drilling processing of different multi-layer rigid-flexible boards 300. Two machines are used for continuous drilling to realize continuous drilling, avoid waiting time for drilling, and improve production efficiency. The crimping assembly 200 arranged fixes the multi-layer rigid-flexible board 300, improves the stability of the multi-layer rigid-flexible board 300, and improves the stability of drilling. The process of docking and drilling of multi-layer rigid-flexible boards can effectively solve the problems of overheating, large wear and short life of the drill tip, save production costs, solve the problems of pulling of the hole wall and drilling burr, and improve product quality.

[0042] It should be noted that the positioning and installation of the drilling tool 100 on the drilling machine is more convenient, and there is no need to directly contact the multi-layer rigid-flexible board 300. After the multi-layer rigid-flexible board 300 is installed on the drilling tool 100, there is no need to repeatedly disassemble the multi-layer rigid-flexible board 300, which reduces a lot of errors during the operation.

[0043] Reference Figure 3 In some embodiments, the upper and lower ends of the first limit block 110, the second limit block 120, the third limit block 130 and the fourth limit block 140 are connected to the crimping assembly 200. The crimping assembly 200 arranged above and below can more stably fix the multi-layer rigid-flexible board 300. It can be understood that the main purpose of the crimping assembly 200 is to fix the multi-layer rigid-flexible board 300 and reduce the vibration of the multi-layer rigid-flexible board 300 during the drilling process.

[0044] Reference Figure 3 In some embodiments, the crimping assembly 200 includes a crimping arm 210 and an elastic member 220. The crimping arm 210 is rotatably connected to the corresponding first limit block 110, the second limit block 120, the third limit block 130 and the fourth limit block 140. One end of the elastic member 220 is connected to the corresponding crimping arm 210, and the other end of the elastic member 220 is connected to the corresponding first limit block 110, the second limit block 120, the third limit block 130 and the fourth limit block 140. The elastic member 220 drives the crimping arm 210 to press the multi-layer rigid-flex board 300. The crimping assembly 200 has a simple structure and is easy to install and operate. It can be understood that the crimping arm 210 is unlocked when it rotates to the corresponding first limit block 110, the second limit block 120, the third limit block 130 and the fourth limit block 140.

[0045] In some embodiments, the elastic member 220 includes a coil spring or a spring.

[0046] Reference Figure 1 and Figure 3 In some embodiments, the first limit block 110, the second limit block 120, the third limit block 130 and the fourth limit block 140 are all provided with a card slot 100a, and the card slot 100a is used to clamp the edge of the multi-layer rigid-flexible board 300. The set card slot 100a enables the multi-layer rigid-flexible board 300 to be fixed and clamped more stably to meet the drilling requirements. The set card slot 100a can limit the vertical jump of the multi-layer rigid-flexible board 300 and ensure the stability of the multi-layer rigid-flexible board 300 during drilling.

[0047] In some embodiments, a buffer pad 100b is installed at the bottom of the slot 100a to prevent the multi-layer rigid-flex board 300 from being torn or squeezed and deformed during drilling. It can be understood that the so-called buffer pad 100b can be a rubber pad or a plastic pad, etc.

[0048] In some embodiments, in step S2, air is extracted for circulation cooling while drilling.

[0049] In some embodiments, step S5 is also included, after the first blind hole 310 and the second blind hole 320 are connected, they are placed for a predetermined time, and then the connected through hole is drilled to remove burrs. It is understandable that there may be some steps at the connection between the first blind hole 310 and the second blind hole 320. The through hole is leveled by drilling to facilitate subsequent processing.

[0050] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A multi-layer rigid-flex board butt drilling process, characterized in that: The invention is applied to a drilling tool (100), wherein the drilling tool (100) comprises a base plate (150), a first limit block (110), a second limit block (120), a third limit block (130) and a fourth limit block (140); the base plate (150) is used for connecting to an external drilling machine; a square avoidance opening (151) is arranged in the middle of the base plate (150); the first limit block (110), the second limit block (120), the third limit block (130) and the fourth limit block (140) are distributed around the avoidance opening (151); the first limit block (110), the second limit block (120), the third limit block (130) and the fourth limit block (140) are arranged around the avoidance opening (151); The first limit block (110), the second limit block (120), the third limit block (130) and the fourth limit block (140) are all slidably arranged on the substrate (150); the first limit block (110), the second limit block (120), the third limit block (130) and the fourth limit block (140) define a loading space (160); the loading space (160) is used to load the circuit board; the first limit block (110), the second limit block (120), the third limit block (130) and the fourth limit block (140) are all connected with a crimping assembly (200); the crimping assembly (200) is used to press the multi-layer rigid-flex board (300); the process comprises the following steps: S1, detecting the size of the multi-layer rigid-flex board (300), driving the first limit block (110), the second limit block (120), the third limit block (130) and the fourth limit block (140) to slide and adjust so that the size of the loading space (160) is adapted to the multi-layer rigid-flex board (300), then driving the crimping assembly (200) to press the multi-layer rigid-flex board (300), and then placing the entire drilling tool (100) at a predetermined installation position of the drilling machine; S2, drilling for the first time, drilling a first blind hole (310), the drilling depth of which is 50% of the product thickness + 0.05 mm, and during the drilling process, cooling the multilayer rigid-flex board (300); S3, taking out the drilling tool (100), and turning over the drilling tool (100) after waiting for a predetermined time; S4, drilling for the second time, two drilling machines are provided, the turned tooling is loaded into the second drilling machine for drilling, the drilling method is the same as the step S2, the second blind hole (320) is drilled, and the first blind hole (310) and the second blind hole (320) are connected during the counter-rotation process.

2. The multi-layer rigid-flex board butt-drilling process according to claim 1, characterized in that: The upper ends and lower ends of the first limiting block (110), the second limiting block (120), the third limiting block (130) and the fourth limiting block (140) are all connected to the crimping assembly (200).

3. The multi-layer rigid-flex board butt-drilling process according to claim 2, characterized in that: The crimping assembly (200) comprises a crimping arm (210) and an elastic member (220); the crimping arm (210) is rotatably connected to the corresponding first limit block (110), the second limit block (120), the third limit block (130) and the fourth limit block (140); one end of the elastic member (220) is connected to the corresponding crimping arm (210); the other end of the elastic member (220) is connected to the corresponding first limit block (110), the second limit block (120), the third limit block (130) and the fourth limit block (140); the elastic member (220) drives the crimping arm (210) to press the multi-layer rigid-flex board (300).

4. The multi-layer rigid-flex board butt-drilling process according to claim 3, characterized in that: The elastic member (220) is a coil spring or a spring sheet.

5. The multi-layer rigid-flex board butt-drilling process according to claim 4, characterized in that: The first limiting block (110), the second limiting block (120), the third limiting block (130) and the fourth limiting block (140) are all provided with a card slot (100a), and the card slot (100a) is used to card the edge of the multi-layer rigid-flex board (300).

6. The multi-layer rigid-flex board butt-drilling process according to claim 5, characterized in that: A buffer pad (100b) is installed at the bottom of the card slot (100a).

7. The multi-layer rigid-flex board butt-drilling process according to claim 1, characterized in that: In the step S2, air is extracted for circulation cooling during drilling.

8. The multi-layer rigid-flex board butt-drilling process according to claim 1, characterized in that: The method further comprises a step S5, wherein after the first blind hole (310) and the second blind hole (320) are connected, they are left for a predetermined time, and then burrs are drilled on the connected through hole.

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