Butt drilling process for multilayer rigid-flex board

Abstract

The application discloses a butt joint drilling process for a multilayer rigid-flex printed circuit board, which is applied to a drilling tool, and the process comprises the following steps: S1, detecting the size of the multilayer rigid-flex printed circuit board, driving first, second, third and fourth limiting blocks to slide and adjust so that the size of a loading space is adapted to the multilayer rigid-flex printed circuit board, then driving a crimping assembly to press the multilayer rigid-flex printed circuit board, and then placing the whole drilling tool into a predetermined mounting position of a drilling machine; S2, first drilling, drilling a first blind hole, and the drilling depth is 50%+0.05 mm of the thickness of a product; S3, taking out the drilling tool, and turning over the drilling tool; S4, second drilling, the drilling machine is provided with two drilling machines, the turned-over tool is loaded into the second drilling machine to be drilled, a second blind hole is drilled, and the first blind hole and the second blind hole are connected in the turning process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit board manufacturing, in particular to a butt joint drilling process for a multilayer rigid-flex printed circuit board. BACKGROUND

[0002] In the production process of a circuit board, drilling is inevitably required.

[0003] At present, when a rigid-flex printed circuit board is drilled, drilling is performed from one side of the circuit board. Due to the complex structure of the multilayer rigid-flex printed circuit board, the single-side drilling method is prone to cause the drill bit to overheat and wear out, resulting in a short service life of the drill bit. In the drilling process, the hole wall is also prone to be pulled and the drill bit is prone to have burrs, which seriously affects the product quality. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a butt joint drilling process for a multilayer rigid-flex printed circuit board, which uses a special tool to effectively drill the multilayer rigid-flex printed circuit board, reduces damage to the drill bit, and improves the quality of the circuit board.

[0005] A butt joint drilling process for a multilayer rigid-flex printed circuit board according to an embodiment of the present application is applied to a drilling tool. The drilling tool includes a base plate, a first limiting block, a second limiting block, a third limiting block, and a fourth limiting block. The base plate is used to be connected to a drilling machine. A square clearance is arranged in the middle of the base plate. The first limiting block, the second limiting block, the third limiting block, and the fourth limiting block are distributed around the clearance. The first limiting block, the second limiting block, the third limiting block, and the fourth limiting block are slidably arranged on the base plate. The first limiting block, the second limiting block, the third limiting block, and the fourth limiting block define a loading space. The loading space is used to load a circuit board. A pressure assembly is connected to each of the first limiting block, the second limiting block, the third limiting block, and the fourth limiting block. The pressure assembly is used to press a multilayer rigid-flex printed circuit board. The process includes the following steps:

[0006] S1. The size of the multilayer rigid-flex printed circuit board is detected. The first limiting block, the second limiting block, the third limiting block, and the fourth limiting block are driven to slide and adjust, so that the size of the loading space is adapted to the multilayer rigid-flex printed circuit board. Then, the pressure assembly is driven to press the multilayer rigid-flex printed circuit board. Finally, the entire drilling tool is placed at a predetermined mounting position of the drilling machine.

[0007] S2. First drilling is performed to drill a first blind hole. The drilling depth is 50%+0.05 mm of the product thickness. In the drilling process, the multilayer rigid-flex printed circuit board is cooled.

[0008] S3, take out the drilling fixture, wait for a predetermined time, and then flip the drilling fixture over;

[0009] S4, Second drilling: Two drilling machines are set up. The flipped tooling is loaded into the second drilling machine for drilling. The drilling method is the same as step S2. Drill out the second blind hole. During the rotation process, the first blind hole and the second blind hole are connected.

[0010] According to an embodiment of the present invention, a drilling process for butt joints of multi-layer rigid-flex plates has at least the following beneficial effects: In the drilling process, a dedicated fixture is used to load the multi-layer rigid-flex plate, ensuring that the multi-layer rigid-flex plate does not come into contact with human hands when flipped. The fixture positions and fixes the multi-layer rigid-flex plate, reducing the impact of stress on the multi-layer rigid-flex plate. Furthermore, the four sliding limit blocks on the fixture can clamp multi-layer rigid-flex plates of different sizes, enabling drilling of different multi-layer rigid-flex plates. Two machines are used for continuous drilling, achieving continuous drilling and avoiding waiting time during butt joints, thus improving production efficiency. The crimping assembly fixes the multi-layer rigid-flex plate, improving its stability and the stability of the drilling.

[0011] According to some embodiments of the present invention, the upper and lower ends of the first limiting block, the second limiting block, the third limiting block and the fourth limiting block are all connected to the pressing assembly, and the pressing assembly arranged vertically can more stably fix the multilayer rigid-flexible composite plate.

[0012] According to some embodiments of the present invention, the crimping assembly includes a pressure arm and an elastic element. The pressure arm is rotatably connected to the corresponding first limiting block, second limiting block, third limiting block, and fourth limiting block. One end of the elastic element is connected to the corresponding pressure arm, and the other end of the elastic element is connected to the corresponding first limiting block, second limiting block, third limiting block, and fourth limiting block. The elastic element drives the pressure arm to press against the multilayer rigid-flexible plate. The crimping assembly has a simple structure and is convenient to install and operate.

[0013] According to some embodiments of the present invention, the elastic element includes a helical spring or a sheet spring.

[0014] According to some embodiments of the present invention, the first limiting block, the second limiting block, the third limiting block and the fourth limiting block are all provided with a slot, the slot is used to engage the edge of the multilayer rigid-flex plate, and the provided slot enables the multilayer rigid-flex plate to be fixed and engaged 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 slot, and the buffer pad is provided to prevent the multi-layer rigid-flexible plate from being torn or deformed by compression during drilling.

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

[0017] According to some embodiments of the present invention, step S5 is further included, in which after the first blind hole and the second blind hole are connected, a predetermined time is placed, and then the connected through hole is deburred.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

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

[0020] Figure 1 This is a schematic diagram of the drilling fixture according to an embodiment of the present invention;

[0021] Figure 2 for Figure 1 An exploded view of the drilling fixture is shown.

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

[0023] Figure 4 A schematic diagram of drilling the first blind hole in a multi-layer rigid-flexible composite plate;

[0024] Figure 5 A schematic diagram of drilling a second blind hole in a multi-layer rigid-flexible composite plate;

[0025] Figure 6 A schematic diagram showing the connection between the first and second blind holes drilled in a multi-layer rigid-flexible composite plate.

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

[0027] First limiting block 110, second limiting block 120, third limiting block 130, fourth limiting block 140;

[0028] Substrate 150, clearance 151, loading space 160;

[0029] Crimp assembly 200, pressure arm 210, elastic element 220;

[0030] Multi-layer rigid-flexible plate 300, first blind hole 310, second blind hole 320. Detailed Implementation

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

[0032] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0033] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0034] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0035] Reference Figures 1 to 6According to an embodiment of the present invention, a drilling process for butt joints of multilayer rigid-flexible composite boards is applied to a drilling fixture 100. The drilling fixture 100 includes a substrate 150, a first limiting block 110, a second limiting block 120, a third limiting block 130, and a fourth limiting block 140. The substrate 150 is used to connect to an external drilling machine. A square clearance opening 151 is provided in the middle of the substrate 150. The first limiting block 110, the second limiting block 120, the third limiting block 130, and the fourth limiting block 140 are distributed around the clearance opening 151. The first limiting block 110... 0. The second limiting block 120, the third limiting block 130 and the fourth limiting block 140 are all slidably disposed on the substrate 150. The first limiting block 110, the second limiting block 120, the third limiting block 130 and the fourth limiting block 140 define a loading space 160 for loading circuit boards. 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 a pressing assembly 200 for pressing the multilayer rigid-flex board 300.

[0036] Specifically, the drilling process for butt joints in multi-layer rigid-flexible composite plates includes the following steps:

[0037] S1, detect the size of the multi-layer rigid-flex plate 300, drive the first limiting block 110, the second limiting block 120, the third limiting block 130 and the fourth limiting block 140 to slide and adjust so that the size of the loading space 160 adapts to the multi-layer rigid-flex plate 300, then drive the pressing assembly 200 to press the multi-layer rigid-flex plate 300, and then place the entire drilling fixture 100 into the predetermined installation position of the drilling machine.

[0038] S2, First drilling, drill the first blind hole 310, the drilling depth is 50% + 0.05mm of the product thickness. During the drilling process, the multi-layer rigid-flex plate 300 is cooled.

[0039] S3, take out the drilling fixture 100, wait for the predetermined time, and then flip the drilling fixture 100.

[0040] S4, second drilling. Two drilling machines are set up. The flipped tooling is loaded into the second drilling machine for drilling. The drilling method is the same as step S2. Drill out the second blind hole 320. During the rotation process, the first blind hole 310 and the second blind hole 320 are connected.

[0041] It should be understood that in the drilling process, a special fixture is used to load the multi-layer rigid-flexible plate 300, ensuring that the multi-layer rigid-flexible plate 300 does not come into contact with the operator's hands during rotation. The fixture positions and fixes the multi-layer rigid-flexible plate 300, reducing the impact of stress on it. Furthermore, the four sliding limit blocks on the fixture allow for clamping of multi-layer rigid-flexible plates 300 of different sizes, enabling drilling of different plates. Two machines are used for continuous drilling, achieving continuous drilling and avoiding waiting time during drilling, thus improving production efficiency. The crimping assembly 200 fixes the multi-layer rigid-flexible plate 300, improving its stability and the stability of the drilling. The process of drilling multi-layer rigid-flexible plates effectively solves the problems of drill bit overheating, high wear, and short lifespan, saving production costs. It also solves problems such as hole wall pulling and drill burrs, improving product quality.

[0042] It should be noted that the drilling fixture 100 is more convenient to position and install on the drilling machine. It does not need to directly contact the multi-layer rigid-flex plate 300. After the multi-layer rigid-flex plate 300 is installed on the drilling fixture 100, it is not necessary to repeatedly disassemble the multi-layer rigid-flex plate 300, which reduces a lot of errors in the operation process.

[0043] Reference Figure 3 In some embodiments, the upper 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 a pressing assembly 200. The pressing assemblies 200 arranged at the upper and lower ends can more stably fix the multilayer rigid-flexible bond plate 300. It can be understood that the main purpose of the pressing assembly 200 is to fix the multilayer rigid-flexible bond plate 300 and reduce the vibration of the multilayer rigid-flexible bond plate 300 during the drilling process.

[0044] Reference Figure 3 In some embodiments, the crimping assembly 200 includes a crimping arm 210 and an elastic element 220. The crimping arm 210 is rotatably connected to the corresponding first limiting block 110, second limiting block 120, third limiting block 130, and fourth limiting block 140. One end of the elastic element 220 is connected to the corresponding crimping arm 210, and the other end of the elastic element 220 is connected to the corresponding first limiting block 110, second limiting block 120, third limiting block 130, and fourth limiting block 140. The elastic element 220 drives the crimping arm 210 to press against the multilayer rigid-flexible bonded plate 300. The crimping assembly 200 has a simple structure and is easy to install and operate. It is understood that the crimping arm 210 is unlocked when it rotates onto the corresponding first limiting block 110, second limiting block 120, third limiting block 130, and fourth limiting block 140.

[0045] In some embodiments, the elastic element 220 includes a helical spring or a sheet spring.

[0046] Reference Figure 1 and Figure 3 In some embodiments, 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 slot 100a. The slot 100a is used to engage the edge of the multi-layer rigid-flex plate 300. The slot 100a enables the multi-layer rigid-flex plate 300 to be fixed and engaged more stably to meet the drilling requirements. The slot 100a can limit the vertical movement of the multi-layer rigid-flex plate 300 and ensure the stability of the multi-layer rigid-flex plate 300 during drilling.

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

[0048] In some embodiments, during step S2, air is drawn in and circulated for 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, a predetermined time is placed, and then the connected through hole is deburred. It is understood 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 have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A drilling process for butt joints of multi-layer rigid-flexible composite plates, characterized in that, The drilling fixture (100) is applied to a drilling tool (100), which includes a base plate (150), a first limiting block (110), a second limiting block (120), a third limiting block (130), and a fourth limiting block (140). The base plate (150) is used to connect to an external drilling machine. A square clearance opening (151) is provided in the middle of the base plate (150). The first limiting block (110), the second limiting block (120), the third limiting block (130), and the fourth limiting block (140) are distributed around the clearance opening (151). The first limiting block (110), the second limiting block (120), the third limiting block (130), and the fourth limiting block (140) are all slidably disposed on the base plate (150). Two limiting blocks (120), the third limiting block (130), and the fourth limiting block (140) define a loading space (160) for loading circuit boards. Each of the first limiting block (110), the second limiting block (120), the third limiting block (130), and the fourth limiting block (140) is connected to a crimping assembly (200). The crimping assembly (200) is used to press against a multilayer rigid-flexible board (300). The crimping assembly (200) includes a pressing arm (210) and an elastic element (220). The pressing arm (210) is rotatably connected to the corresponding first limiting block (110), second limiting block (120), third limiting block (130), and fourth limiting block (140). The process includes the following steps: S1, detect the size of the multi-layer rigid-flex plate (300), drive the first limiting block (110), the second limiting block (120), the third limiting block (130) and the fourth limiting block (140) to slide and adjust so that the size of the loading space (160) adapts to the multi-layer rigid-flex plate (300), then drive the pressing assembly (200) to press the multi-layer rigid-flex plate (300), and then place the entire drilling fixture (100) into the predetermined installation position of the drilling machine; S2, First drilling, drill the first blind hole (310), the drilling depth is 50% + 0.05 mm of the product thickness. During the drilling process, the multi-layer rigid-flexible plate (300) is cooled. S3, take out the drilling fixture (100), wait for a predetermined time, and then flip the drilling fixture (100). S4, second drilling. Two drilling machines are set up. The flipped tooling is loaded into the second drilling machine for drilling. The drilling method is the same as step S2. Drill out the second blind hole (320). During the rotation process, the first blind hole (310) and the second blind hole (320) are connected.

2. The drilling process for butt joints of multi-layer rigid-flexible plates according to claim 1, characterized in that: The upper 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 drilling process for butt joints of multi-layer rigid-flexible plates according to claim 2, characterized in that: One end of the elastic element (220) is connected to the corresponding pressure arm (210), and the other end of the elastic element (220) is connected to the corresponding first limiting block (110), second limiting block (120), third limiting block (130) and fourth limiting block (140). The elastic element (220) drives the pressure arm (210) to press against the multilayer rigid-flexible plate (300).

4. The drilling process for butt joints of multi-layer rigid-flexible plates according to claim 3, characterized in that: The elastic element (220) is a helical spring or a spring sheet.

5. The drilling process for butt joints of multi-layer rigid-flexible plates 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 slot (100a), which is used to engage the edge of the multilayer rigid-flexible plate (300).

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

7. The drilling process for butt joints of multi-layer rigid-flexible plates according to claim 1, characterized in that: In step S2, air is drawn out and circulated for cooling during drilling.

8. The drilling process for butt joints of multi-layer rigid-flexible plates according to claim 1, characterized in that: It also includes step S5, which involves placing the first blind hole (310) and the second blind hole (320) together for a predetermined time, and then performing burr drilling on the connected through hole.

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