A core plate structure suitable for multiple pressing of N+N structure

Abstract

The utility model discloses a core plate structure suitable for N+N structure multiple pressing, including core plate main part, be provided with a plurality of groups interval arrangement's PIN hole group on the core plate main part, each group PIN hole group all includes four PIN holes that present cross distribution, and four PIN holes are arranged in the upper middle part, lower middle part, left middle part and right middle part of core plate main part respectively, the spacing between two planes of PIN hole is 4.5mm-5mm, and the farthest spacing of two arc surfaces of PIN hole is 7mm-7.5mm. The utility model effectively solves the alignment of the second, third pressing of N+N structure and the short circuit hidden danger of inner layer that uses rivet positioning bring.

Description

Technical Field

[0001] This utility model relates to the field of PCB manufacturing, specifically to a core board structure suitable for multiple lamination of N+N structures. Background Technology

[0002] In the PCB (Printed Circuit Board) manufacturing industry, the lamination process of N+N multilayer boards has always been a key technical focus. Currently, the existing N+N structure multilayer lamination alignment process is as follows: the first lamination uses a PIN hole + fusion positioning method → ​​inner layer drilling target → the second lamination uses a riveting positioning method → ​​inner layer drilling target → the third lamination uses a riveting positioning method → ​​transfer to another process.

[0003] When processing N+N structure multi-layer lamination plates using the above-described process, the second and third laminations involve first drilling 3.2mm rivet holes on the plate's edge using an inner-layer drilling machine. After browning, a special rivet tool is used for pre-lamination, followed by rivet fixing. However, rivet positioning relies on mechanical riveting, resulting in poor overall alignment during lamination. This can easily lead to rivet breakage, uneven rivet surface development, and rivet shavings, significantly impacting the lamination quality. Utility Model Content

[0004] The purpose of this invention is to provide a pressing and positioning fixture suitable for multiple pressing of N+N structures, so as to solve the misalignment and potential short circuit hazards in the inner layer caused by using rivets for positioning in the second and third pressing.

[0005] The technical solution of this utility model is as follows: A core board structure suitable for multiple lamination of N+N structure includes a core board body. The core board body is provided with multiple sets of spaced PIN hole groups. Each set of PIN hole groups includes four PIN holes arranged in a cross shape. The four PIN holes are respectively located in the upper middle, lower middle, left middle, and right middle of the core board body. Two opposite sides of the PIN hole are flat, and the other two opposite sides are curved. The distance between the two flat sides of the PIN hole is 4.5mm-5mm, and the farthest distance between the two curved sides of the PIN hole is 7mm-7.5mm.

[0006] As a preferred embodiment of this utility model, in a set of PIN holes, the distance between two PIN holes that are opposite each other on the left and right is 400mm-500mm, and the distance between two PIN holes that are opposite each other on the top and bottom is 450mm-550mm.

[0007] As a preferred embodiment of this utility model, in a set of PIN holes, the distance between two PIN holes that are opposite each other on the left and right is 450mm, and the distance between two PIN holes that are opposite each other on the top and bottom is 514.35mm.

[0008] As a preferred embodiment of this utility model, the lateral center distance between two adjacent sets of PIN holes is 6mm-7mm, and the longitudinal center distance between two adjacent sets of PIN holes is 7mm-8mm.

[0009] As a preferred embodiment of this utility model, the lateral center distance between two adjacent sets of PIN holes is 6.53 mm, and the longitudinal center distance between two adjacent sets of PIN holes is 7.58 mm.

[0010] As a preferred embodiment of this utility model, the distance between the two planes of the PIN hole is 4.77mm.

[0011] As a preferred embodiment of this utility model, the furthest distance between the two arc surfaces of the PIN hole is 7.11 mm.

[0012] As a preferred embodiment of this utility model, the PIN hole group is provided in two sets, and the two sets of PIN hole groups are distributed in a stepped manner on the core board body.

[0013] As a preferred embodiment of this utility model, the PIN hole group is provided in three groups, and the three groups of PIN hole groups are distributed in a stepped manner on the core board body.

[0014] As a preferred embodiment of this utility model, the PIN hole group is provided in four groups, and the four groups of PIN hole groups are distributed in a stepped manner on the core board body.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The PIN holes used are larger than 3.2mm rivet holes, resulting in a larger contact area when mated with the locating pins. The combination of flat and curved surfaces provides more stable mechanical constraints during pressing, making it less likely for the layers to slip, thus significantly improving alignment accuracy. 2. By setting multiple sets of PIN hole groups with different spacing on the core board body, and selecting an unused PIN hole group as positioning holes each time it is pressed, the positioning accuracy between layers can be greatly improved by using PIN hole positioning instead of rivet positioning, reducing the risk of short circuits caused by rivet debris during pressing, and improving the electrical performance reliability of the PCB board. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a core board structure applicable to multiple pressing of an N+N structure in one embodiment of the present invention; Figure 2 This is a schematic diagram of the PIN hole structure in one embodiment of the present invention; Figure 3 This is a schematic diagram of a core board structure applicable to multiple pressing of an N+N structure in another embodiment of the present invention; Figure 4 This is a schematic diagram of a core board structure applicable to multiple pressing of an N+N structure in another embodiment of the present invention.

[0018] In the diagram, 1. Core board body; 2. PIN hole. Detailed Implementation

[0019] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. It is also declared that the embodiments described below are only for explaining this utility model and are not intended to limit this utility model.

[0020] It should be noted that the terms "installation," "setting," "connection," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly defined. Indications of orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used in the application's product, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. "Multiple sets" means two or more sets, unless otherwise explicitly defined.

[0021] Please see Figures 1 to 2 This utility model provides a core board structure suitable for multiple pressing of N+N structures, including a core board body 1. The core board body 1 has multiple sets of spaced-apart PIN hole groups. Each PIN hole group includes four PIN holes 2 arranged in a cross shape, and the four PIN holes 2 are respectively located at the upper center, lower center, left center, and right center of the core board body 1, forming a uniform positioning system. Two opposite sides of the PIN hole 2 are flat, and the other two opposite sides are curved. The distance between the two flat sides of the PIN hole 2 is 4.5mm-5mm, and the furthest distance between the two curved sides of the PIN hole 2 is 7mm-7.5mm. This size of the PIN hole 2 is larger than a 3.2mm rivet hole, resulting in a larger contact area when mating with the positioning pin. Furthermore, the combination of flat and curved surfaces provides more stable mechanical constraints during pressing, making it less prone to slippage of the layers and significantly improving alignment accuracy.

[0022] This embodiment is applicable to core board structures with N+N structure and multiple lamination. By setting multiple sets of PIN hole groups with spacing on the core board body 1, and selecting an unused PIN hole group as positioning holes for each lamination, the core board structure can be used for N+N structure multiple lamination processes (such as the second, third, and fourth laminations). By using PIN hole 2 for positioning instead of rivet positioning, the interlayer alignment accuracy can be greatly improved, the risk of short circuits caused by lamination foreign matter due to rivet debris can be reduced, and the electrical performance reliability of the PCB board can be improved.

[0023] In one embodiment, in a set of PIN holes, the spacing between two PIN holes 2 that are opposite each other on the left and right is 400mm-500mm, preferably 450mm, and the spacing between two PIN holes 2 that are opposite each other on the top and bottom is 450mm-550mm, preferably 514.35mm. The spacing between the PIN holes that are opposite each other on the left and right and the spacing between the PIN holes that are opposite each other on the top and bottom form an approximately rectangular positioning frame, so that the positioning force is evenly distributed in the center of the four edges of the core board body 1, which can effectively balance the force in each direction during the pressing process and avoid uneven force and deformation of the board due to the offset of the positioning point. At the same time, the spacing range of 400mm-500mm and 450mm-550mm can be applied to core board bodies 1 of various specifications, enhancing the versatility of the core board structure. In actual production, PCB boards of different sizes can select appropriate spacing values ​​(such as the preferred values) according to their own specifications to ensure the positioning effect.

[0024] In one embodiment, the lateral center distance between two adjacent sets of PIN holes is 6mm-7mm, preferably 6.53mm, and the longitudinal center distance between two adjacent sets of PIN holes is 7mm-8mm, preferably 7.58mm. Maintaining an appropriate spacing between adjacent PIN hole sets (such as the preferred values ​​of 6.53mm and 7.58mm) ensures that each set of PIN holes is independently distributed on the core board body 1 and does not interfere with each other. This reasonable spacing avoids the distance between adjacent PIN hole sets being too close, preventing a reduction in the structural strength of the core board body 1's frame due to excessively small hole spacing.

[0025] In one embodiment, the distance between the two planes of the PIN hole 2 is 4.77 mm, and the farthest distance between the two arc surfaces of the PIN hole 2 is 7.11 mm. The PIN hole 2 with the above-mentioned dimensions is larger than the traditional 3.2 mm rivet hole. When the locating pin is inserted into the PIN hole, the larger hole diameter significantly increases the contact area between the locating pin and the PIN hole, which can improve the friction and mechanical constraint between the locating pin and the PIN hole, thereby effectively preventing slippage of the layers during the pressing process and improving the alignment accuracy between layers.

[0026] Please see Figure 1 In one embodiment, two sets of PIN holes are provided, and the two sets of PIN holes are distributed in a stepped manner on the core board body 1. The two sets of PIN holes can support two pressing processes. Each pressing uses one set of unused PIN holes. For example, the lower set of PIN holes is selected during the first pressing, and the upper set of PIN holes is selected during the second pressing. This achieves the alternating use of positioning holes, avoiding the cumbersome operation of drilling multiple holes required for traditional rivet positioning, and adapting to the two-pressing scenarios commonly found in N+N structures. At the same time, the two sets of PIN holes distributed in a stepped manner on the core board body 1 are staggered, which reduces the horizontal or vertical space occupation compared to a side-by-side distribution.

[0027] Please see Figure 3 In one embodiment, three sets of PIN holes are provided, and the three sets of PIN holes are distributed in a stepped manner on the core board body 1. The three sets of PIN holes can support two pressing processes. Each pressing uses one set of unused PIN holes. For example, the lower set of PIN holes is selected for the first pressing, the middle set of PIN holes is selected for the second pressing, and the upper set of PIN holes is selected for the third pressing. This achieves the alternating use of positioning holes, avoiding the cumbersome operation of drilling multiple holes required for traditional rivet positioning, and adapting to the three-pressing scenario commonly found in N+N structures. At the same time, the staggered arrangement of the three sets of PIN holes on the core board body 1 reduces the horizontal or vertical space occupation compared to a side-by-side distribution.

[0028] Please see Figure 4In one embodiment, four sets of PIN holes are provided, and the four sets of PIN holes are distributed in a stepped manner on the core board body 1. The four sets of PIN holes can support two pressing processes. Each pressing process uses one set of unused PIN holes. For example, in the first pressing, the bottom set of PIN holes is selected; in the second pressing, the next bottom set is selected; in the third pressing, the next top set is selected; and in the fourth pressing, the top set is selected. This achieves the alternating use of positioning holes, avoiding the cumbersome operation of drilling multiple holes required for traditional rivet positioning, and adapting to the four-pressing scenario commonly found in N+N structures. At the same time, the staggered arrangement of the four sets of PIN holes on the core board body 1 reduces the horizontal or vertical space occupation compared to a side-by-side distribution. Of course, in other embodiments, five or more sets of PIN holes can be provided to accommodate more pressing processes, and this utility model does not limit this.

[0029] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

[0030] The present utility model patent has been described above with reference to the accompanying drawings. Obviously, the implementation of the present utility model patent is not limited to the above-described manner. Any improvements made by adopting the inventive concept and technical solution of the present utility model patent, or the direct application of the inventive concept and technical solution of the present utility model patent to other occasions without modification, are all within the protection scope of the present utility model.

Claims

1. A core board structure suitable for multiple lamination of N+N structures, characterized in that, The device includes a core board body, on which multiple sets of spaced-apart PIN hole groups are provided. Each set of PIN hole groups includes four PIN holes arranged in a cross shape. The four PIN holes are respectively located at the upper middle, lower middle, left middle, and right middle of the core board body. Two opposite sides of the PIN hole are flat, and the other two opposite sides are curved. The distance between the two flat sides of the PIN hole is 4.5mm-5mm, and the farthest distance between the two curved sides of the PIN hole is 7mm-7.5mm.

2. The core board structure suitable for multiple lamination of N+N structures according to claim 1, characterized in that, In a set of PIN holes, the spacing between two PIN holes that are opposite each other on the left and right is 400mm-500mm, and the spacing between two PIN holes that are opposite each other on the top and bottom is 450mm-550mm.

3. The core board structure suitable for multiple lamination of N+N structures according to claim 2, characterized in that, In a set of PIN holes, the distance between two PIN holes that are opposite each other on the left and right is 450 mm, and the distance between two PIN holes that are opposite each other on the top and bottom is 514.35 mm.

4. The core board structure suitable for multiple lamination of N+N structures according to claim 1, characterized in that, The lateral center distance between two adjacent PIN hole groups is 6mm-7mm, and the longitudinal center distance between two adjacent PIN hole groups is 7mm-8mm.

5. The core board structure suitable for multiple lamination of N+N structures according to claim 4, characterized in that, The lateral center distance between two adjacent sets of PIN holes is 6.53 mm, and the longitudinal center distance between two adjacent sets of PIN holes is 7.58 mm.

6. The core board structure suitable for multiple lamination of N+N structures according to claim 1, characterized in that, The distance between the two planes of the PIN hole is 4.77 mm.

7. The core board structure suitable for multiple lamination of N+N structures according to claim 1, characterized in that, The furthest distance between the two arc surfaces of the PIN hole is 7.11 mm.

8. The core board structure suitable for multiple lamination of N+N structures according to claim 1, characterized in that, The PIN hole group is provided in two sets, and the two sets of PIN hole groups are distributed in a stepped manner on the core board body.

9. The core board structure suitable for multiple lamination of N+N structures according to claim 1, characterized in that, The PIN hole group is provided in three sets, and the three sets of PIN hole groups are distributed in a stepped manner on the core board body.

10. The core board structure suitable for multiple lamination of N+N structures according to claim 1, characterized in that, The PIN hole group is provided in four groups, and the four groups of PIN holes are distributed in a stepped manner on the core board body.

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