Soft and hard board production process with gapless soft board area after bending

Abstract

A soft and hard board production process with a gapless soft board area after bending comprises the following steps: S1, determining the bending angle and the bending radius of the soft board area according to use requirements, and determining the length of a base layer soft board bending area after the soft board area is bent; s2, by taking the length of the bending area of the base layer soft board as a reference, calculating the length difference of the adjacent layers of soft boards according to the bending angle; s3, after the length of each layer of soft board is determined, the lower hard board, the multi-layer soft board and the upper hard board are stacked in sequence, the length of the multi-layer soft board is gradually increased from bottom to top, and then the lower hard board, the multi-layer soft board and the upper hard board are combined, pressed and formed on a pressing jig; and S4, taking down the pressed and molded soft and hard board from the pressing jig, protecting the arched area of the soft board area by adopting a horizontal jig, and completing subsequent working procedures such as outer-layer circuit and solder resist manufacturing and the like. And S5, bending the soft board area according to the bending requirement after the outer layer circuit and the soft and hard board after the solder resist manufacturing are completed until the appearance is formed.

Description

Technical Field

[0001] The invention relates to the field of printed circuits, and in particular to a production process for a soft and hard board with no gap in the soft board area after bending. Background Art

[0002] The birth and development of FPC (flexible circuit board) and PCB (printed circuit board) gave birth to a new product called rigid-flex board. Therefore, rigid-flex board is a circuit board with FPC and PCB characteristics formed by combining a flexible circuit board and a rigid circuit board through lamination and other processes according to relevant process requirements. The existing rigid-flex board includes two rigid boards and a flexible board area connected between the two rigid boards. The flexible board area is composed of multiple layers of flexible boards, and the length of each layer of flexible boards is the same. Figure 4 In some specific use occasions, the soft board area needs to be bent for use. However, after the existing soft board area is bent, there will be gaps 8 between the layers of soft boards 7. At the same time, the stresses at the connections between the layers of soft boards 7 and the hard boards 6 are different. As the use time increases, the soft boards with greater stress are prone to damage and poor contact. Summary of the invention

[0003] The present invention provides a production process for a hard and soft board with no gap in the soft board area after bending, and its main purpose is to overcome the problem that a gap exists between two adjacent soft boards after the soft board area of ​​the existing hard and soft boards is bent.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A production process for a soft and hard board with no gap in the soft board area after bending, the soft and hard board comprises two hard boards and a soft board area connected between the two hard boards, the hard board comprises a lower hard board and an upper hard board, the soft board area comprises multiple layers of soft boards stacked up and down, and the production process comprises the following steps:

[0006] S1. Determine the bending angle and bending radius of the soft board area according to the use requirements, and determine the length of the bending area of ​​the base soft board after the soft board area is bent;

[0007] S2, taking the length of the bending area of ​​the base soft board as a reference, calculating the length difference of adjacent soft boards according to the bending angle, so as to ensure that there is no gap between two adjacent soft boards after each layer of soft board is bent;

[0008] S3. After determining the length of each layer of soft board, stack the lower hard board, multi-layer soft board and upper hard board in order, wherein the length of the multi-layer soft board gradually increases from bottom to top, and then combine the lower hard board, multi-layer soft board and upper hard board on a pressing jig, and press them into shape by a transfer press. After the soft and hard boards are pressed into shape, the middle of the soft board area is in an upward arch shape;

[0009] S4. Remove the pressed and formed soft and hard boards from the pressing jig. Combined with the requirements of the horizontal line processing flow of the post-process, use a horizontal jig to protect the arched area of ​​the soft board area to complete subsequent processes such as outer layer circuit and solder mask production.

[0010] S5. After the outer layer circuit and solder mask are made, the hard and soft boards are completed to the shape, and the soft board area is bent according to the bending requirements. After bending, the layers of soft boards are tightly fitted without gaps in the middle.

[0011] Furthermore, after each layer of soft board is bent, two non-bending areas and a bending area located between the two non-bending areas are formed. The total length of each layer of soft board is the sum of the straight-line lengths of the two non-bending areas plus the semicircular circumference of the bending area. The sum of the straight-line lengths of the two non-bending areas of each layer of soft board is equal.

[0012] Furthermore, the semicircle circumference of the bending zone of each layer of the flexible board is calculated as follows: Where π is the circumference of a circle and r is the bending radius. When the straight lengths of the two non-bending areas of each layer of the flexible board are equal and the bending angles are the same, the length difference between the two adjacent layers of the flexible board is

[0013] Furthermore, the pressing jig comprises a lower pressing jig and an upper pressing jig, the bottom of the upper pressing jig is provided with an escape space extending upward, and the two hard plates are located between the lower pressing jig and the upper pressing jig.

[0014] Furthermore, the lower pressing jig is provided with a first jig pin, and the bottom of the upper pressing jig is provided with a first pin hole extending upward, and the first jig pin extends into the first pin hole.

[0015] Furthermore, the horizontal jig includes a jig bottom plate and a jig cover plate, the two hard plates are located between the jig bottom plate and the jig cover plate, and the jig bottom plate and the jig cover plate are both hollow structures that penetrate from top to bottom.

[0016] Furthermore, a second jig pin is provided on the top of the jig bottom plate, and the two hard plates are both provided with a second pin hole for the second jig pin to be inserted.

[0017] From the above description of the present invention, it can be seen that compared with the prior art, the present invention has the following advantages: the present invention uses soft boards of different lengths to stack up and down, and before the soft and hard boards are pressed together, the length of each layer of soft boards is determined according to the bending angle of the soft board area, and then the soft boards are stacked in order from short to long and from bottom to top, and finally the hard board and each layer of soft boards are pressed together on a pressing jig. The method is used to press the soft and hard boards, so that there will be no gap between the two adjacent layers of soft boards in the soft board area composed of multiple layers of soft boards after bending, and the stress at the connection between each layer of soft boards and the hard board is balanced, and each layer of soft boards is not prone to damage or poor contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional schematic diagram of the pressing fixture of the present invention in the main viewing direction.

[0019] Figure 2 It is a cross-sectional schematic diagram of the horizontal fixture of the present invention in the main viewing direction.

[0020] Figure 3 It is a schematic cross-sectional view in the top view of the horizontal jig of the present invention after the jig cover is removed.

[0021] Figure 4 This is a schematic diagram of the existing soft board area after bending.

[0022] Figure 5 It is a schematic diagram of the soft board area after bending of the present invention. DETAILED DESCRIPTION

[0023] Reference Figures 1 to 3 , Figure 5 A production process for a soft and hard board with no gap in the soft board area after bending, wherein the soft and hard board comprises two hard boards 6 and a soft board area connected between the two hard boards, wherein the hard board 6 comprises a lower hard board and an upper hard board, and the soft board area comprises a plurality of soft boards 7 stacked up and down, and the production process comprises the following steps:

[0024] S1. Determine the bending angle and bending radius of the soft board area according to the use requirements, and determine the length of the bending area of ​​the base soft board 7 after the soft board area is bent;

[0025] S2, taking the length of the bending area of ​​the base soft board 7 as a reference, calculating the length difference of adjacent soft boards 7 according to the bending angle, so as to ensure that there is no gap between two adjacent soft boards 7 after each layer of soft board 7 is bent;

[0026] S3, after determining the length of each layer of soft board 7, stack the lower hard board, multi-layer soft board 7 and upper hard board in order, wherein the length of the multi-layer soft board 7 gradually increases from bottom to top, and then combine the lower hard board, multi-layer soft board 7 and upper hard board on the pressing jig 1, and press them into shape by the press machine. After the soft and hard boards are pressed into shape, the middle of the soft board area is in an upward arch shape;

[0027] S4. Remove the pressed and formed soft and hard boards from the pressing jig. Combined with the requirements of the horizontal line processing flow of the post-process, use the horizontal jig 5 to protect the arched area of ​​the soft board area, and complete the subsequent outer layer circuit and solder mask production processes.

[0028] S5. After the outer layer circuit and the hard and soft boards are formed, the soft board area is bent according to the bending requirements. After bending, each layer of the soft board 7 is tightly fitted without gaps in the middle.

[0029] After each layer of soft board 7 is bent, two non-bending areas and a bending area between the two non-bending areas are formed. The total length of each layer of soft board 7 is the sum of the straight lengths of the two non-bending areas plus the semicircular circumference of the bending area. The sum of the straight lengths of the two non-bending areas of each layer of soft board 7 is equal. The straight length of the non-bending area of ​​each layer of soft board 7 is determined according to the usage scenario. The semicircular circumference of the bending area of ​​each layer of soft board 7 is calculated as follows: Where π is the circumference of a circle and r is the bending radius. When the straight lengths of the two non-bending areas of each layer of the soft board 7 are equal and the bending angles are the same, the length difference between the two adjacent layers of the soft board is

[0030] The soft board area is bent 180 degrees, the bottom soft board 7 is used as the base soft board, and the length of the bending area of ​​the base soft board is used as the reference. According to the above calculation formula, the length difference between the upper soft board 7 and the bottom soft board 7 is: On the basis of knowing the length of the base soft board, the length of the upper soft board 7 can be obtained, and similarly, the length of each soft board 7 can be obtained.

[0031] Reference Figure 1The pressing jig 1 includes a lower pressing jig 2 and an upper pressing jig 3. The bottom of the upper pressing jig 3 is provided with an escape space 4 extending upward, and the two hard plates are located between the lower pressing jig 2 and the upper pressing jig 3. The lower pressing jig 2 includes a pressing bottom plate 21, a jig bottom plate 22, a first lower pressing auxiliary material 23, a lower pressing steel plate 24, and a second lower pressing auxiliary material 25 stacked in sequence from bottom to top. The upper pressing jig 3 includes a pressing cover plate 31, a jig cover plate 32, a first upper pressing auxiliary material 33, an upper pressing steel plate 34, and a second upper pressing auxiliary material 35 stacked in sequence from top to bottom. The first upper pressing auxiliary material 33, the upper pressing steel plate 34, and the second upper pressing auxiliary material 35 are all hollow structures, and the hollow parts of the first upper pressing auxiliary material 33, the upper pressing steel plate 34, and the second upper pressing auxiliary material 35 constitute the escape space 4. The lower pressing jig 2 is provided with a first jig pin 20. Specifically, the first jig pin 20 is provided on the top of the jig bottom plate 22. The bottom of the upper pressing jig 3 is provided with a first pin hole extending upward (not marked in the figure due to view reasons). The first jig pin 20 extends into the first pin hole (not marked in the figure due to view reasons). Specifically, the jig cover plate 32, the first upper pressing auxiliary material 33, the upper pressing steel plate 34 and the second upper pressing auxiliary material 35 are all provided with pin holes. The pin holes of the jig cover plate 32, the first upper pressing auxiliary material 33, the upper pressing steel plate 34 and the second upper pressing auxiliary material 35 constitute the first pin hole. In this embodiment, there are four first jig pins 20 and four first pin holes (not marked in the figure due to viewing reasons), and the four first jig pins 20 and the four first pin holes (not marked in the figure due to viewing reasons) are distributed in four corners, and each hard plate 6 is provided with two second pin holes (not marked in the figure due to viewing reasons), and each first jig pin 20 corresponds to one first pin hole (not marked in the figure due to viewing reasons) and one second pin hole (not marked in the figure due to viewing reasons).

[0032] Reference Figure 1The lamination process of the hard board and the soft board is as follows: first, place the lower hard board of the two hard boards 6 on the top of the lower lamination jig 2, and then stack the layers of soft boards 7 on the lower hard board in order from short to long and from bottom to top, and then place the upper hard board of the two hard boards 6 on the topmost soft board 7, and at the same time, the first jig pin 20 passes through the two hard boards 6, and then stack the second upper lamination auxiliary material 35, the upper lamination steel plate 34, the first upper lamination auxiliary material 33, the jig cover plate 32 and the lamination cover plate 31 in order from bottom to top, and finally, the lower lamination jig 2 and the upper lamination jig 3 are pressed to press the layers of soft boards 7 and the hard board 6 into shape, and the lower hard board and the adjacent soft board 7, the layers of soft boards 7, and the upper hard board and the adjacent soft board 7 are bonded by adhesive materials commonly used in the field. Since the middle of the soft board area is in an upward arch shape after the soft and hard boards are pressed together, the avoidance space 4 provides space for the upward arch of the middle of the soft board area. The first fixture pin 20 passes through the first pin hole (not marked in the figure due to the view reason) and the second pin hole (not marked in the figure due to the view reason) so that each layer of soft board 7 and hard board 6 will not shift during the pressing process.

[0033] Reference Figure 2 and Figure 3 , the horizontal jig 5 includes a jig base plate 51 and a jig cover plate 52, the two hard plates 6 are located between the jig base plate 51 and the jig cover plate 52, and the jig base plate 51 and the jig cover plate 52 are both hollow structures that pass through from top to bottom. A second jig pin 53 is provided on the top of the jig base plate 51. In this embodiment, four second jig pins 53 are provided, and each second jig pin 53 corresponds to a second pin hole (not marked in the figure due to view reasons). After the second jig pin 53 is inserted into the second pin hole (not marked in the figure due to view reasons), the two hard plates 6 will not shift, ensuring that the soft and hard boards will not shift when being transported on the conveyor line of the next process. The conveyor line of the next process includes a lower roller and an upper roller. The jig bottom plate 51 is located on the lower roller, and the upper roller is pressed on the top surface of the jig cover plate 52. After the soft board area is arched, it is located in the hollow structure of the jig cover plate 52, and the highest height of the soft board area after the arch is lower than the top surface of the jig cover plate 52, so that the arched part of the soft board area will not be crushed by the upper roller.

[0034] The above is only a specific implementation of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A process for producing a hard and soft board with no gap in the soft board area after bending, wherein the hard and soft board comprises two hard boards and a soft board area connected between the two hard boards, wherein the hard board comprises a lower hard board and an upper hard board, and the soft board area comprises multiple layers of soft boards stacked up and down, characterized in that: The production process comprises the following steps: S1. Determine the bending angle and bending radius of the soft board area according to the use requirements, and determine the length of the bending area of ​​the base soft board after the soft board area is bent; S2, taking the length of the bending area of ​​the base soft board as a reference, calculating the length difference of adjacent soft boards according to the bending angle, so as to ensure that there is no gap between two adjacent soft boards after each layer of soft board is bent; S3. After determining the length of each layer of soft board, stack the lower hard board, multi-layer soft board and upper hard board in order, wherein the length of the multi-layer soft board gradually increases from bottom to top, and then combine the lower hard board, multi-layer soft board and upper hard board on a pressing jig, and press them into shape by a transfer press. After the soft and hard boards are pressed into shape, the middle of the soft board area is in an upward arch shape; S4. Remove the pressed and formed soft and hard boards from the pressing jig. Combined with the requirements of the horizontal line processing flow of the post-process, use a horizontal jig to protect the arched area of ​​the soft board area to complete subsequent processes such as outer layer circuit and solder mask production. S5. After the outer layer circuit and solder mask are made, the hard and soft boards are completed to the shape, and the soft board area is bent according to the bending requirements. After bending, the layers of soft boards are tightly fitted without gaps in the middle.

2. A process for producing a hard and soft board with no gap in the soft board area after bending as claimed in claim 1, characterized in that: After each layer of flexible board is bent, two non-bending areas and a bending area between the two non-bending areas are formed. The total length of each layer of flexible board is the sum of the straight-line lengths of the two non-bending areas plus the semicircle length of the bending area. The sum of the straight-line lengths of the two non-bending areas of each layer of flexible board is equal.

3. A process for producing a hard and soft board with no gap in the soft board area after bending as claimed in claim 2, characterized in that: The calculation method of the semicircle circumference of the bending zone of each layer of soft board is: Where π is the circumference of a circle and r is the bending radius. When the straight lengths of the two non-bending areas of each layer of the flexible board are equal and the bending angles are the same, the length difference between the two adjacent layers of the flexible board is 4. A process for producing a hard and soft board with no gap in the soft board area after bending as claimed in claim 1, characterized in that: The pressing jig comprises a lower pressing jig and an upper pressing jig, the bottom of the upper pressing jig is provided with an escape space extending upward, and the two hard plates are located between the lower pressing jig and the upper pressing jig.

5. A process for producing a hard and soft board with no gap in the soft board area after bending as claimed in claim 4, characterized in that: The lower pressing jig is provided with a first jig pin, and the bottom of the upper pressing jig is provided with a first pin hole extending upward, and the first jig pin extends into the first pin hole.

6. A process for producing a hard and soft board with no gap in the soft board area after bending as claimed in claim 1, characterized in that: The horizontal jig includes a jig bottom plate and a jig cover plate, the two hard plates are located between the jig bottom plate and the jig cover plate, and the jig bottom plate and the jig cover plate are both hollow structures that penetrate from top to bottom.

7. A process for producing a hard and soft board with no gap in the soft board area after bending as claimed in claim 6, characterized in that: A second jig pin is disposed on the top of the jig bottom plate, and both of the two hard plates are provided with a second pin hole for the second jig pin to be inserted.

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