Pressing assembly for improving alignment precision of core board of pcb (printed circuit board)
By combining the pressing base, top cover, and rivet unit, the problem of uneven force caused by rivet head deformation during the pressing of high-layer PCB boards is solved, thereby improving the alignment accuracy between the core boards.
Patent Information
- Application Number
- CN202423247686.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2034-12-27
AI Technical Summary
During the lamination process of high-layer PCBs, the deformation of common rivet caps can cause uneven stress in various directions of stacked components, resulting in sliding between core boards and reducing alignment accuracy.
The structure adopts a combination of pressing base, pressing top cover, multiple rivet units and stacked components. Through the design of limiting holes and connecting holes, it ensures that the rivet heads do not contact the pressing parts, so as to achieve uniform force between each core board and reduce the difference in expansion and contraction.
It improves the alignment accuracy between the core boards of each layer of the PCB board, avoids deformation of the rivet head, ensures uniform force in all directions during the pressing process, and improves the alignment accuracy of the core board.
Smart Images
Figure CN223730037U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of for improving the core board alignment accuracy of pcb board pressure assembly. BACKGROUND
[0002] With the further development of electronic information technology, electronic product structure is more and more complex, function is more and more comprehensive, prompting PCB board to the design development of function highly integrated and small, PCB board layer superposition is gradually more. The number of layers of PCB board processing in the industry has reached ≥40 layers, pitch spacing 0.4pitch, for this kind of high-difficulty PCB board, the industry generally adopts Pin-lam manufacturing method.
[0003] But for the processing number of layers reached ≥40 layers PCB board processing, commonly rivet is riveted together by riveting assembly, then pressure is applied, but pressure process is often easy to rivet cap deformation, extrusion is generated to stacked assembly, stacked assembly is unevenly stressed in each direction, leading to local expansion and contraction inconsistency, finally each core board appears slide plate, reduce the alignment accuracy between each core board in PCB. UTILITY MODEL CONTENT
[0004] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a kind of for improving the core board alignment accuracy of pcb board pressure assembly, which can improve the alignment accuracy between each core board in pressure process.
[0005] The purpose of the utility model is realized by the following technical solutions:
[0006] A kind of for improving the core board alignment accuracy of pcb board pressure assembly, including pressure base, pressure top cover, multiple rivet units and stacked assembly;Multiple upper positioning units are provided on the pressure top cover, multiple lower positioning units corresponding to multiple upper positioning units are provided on the pressure base, multiple rivet units and multiple upper positioning units are one-to-one corresponding respectively, the rivet unit includes first rivet and second rivet;First rivet cap is provided on the first rivet, and second rivet cap is provided on the second rivet;The upper positioning unit includes upper positioning hole, upper limiting hole and upper communication hole;The first rivet of corresponding rivet unit is arranged in the upper positioning hole, the second rivet of corresponding rivet unit is arranged in the upper communication hole, and the second rivet cap of the second rivet of corresponding rivet unit is accommodated in the upper limiting hole;The lower positioning unit includes lower positioning hole, lower limiting hole and lower communication hole;The second rivet of corresponding rivet unit is arranged in the lower positioning hole, the first rivet of corresponding rivet unit is arranged in the lower communication hole, and the first rivet cap of the first rivet of corresponding rivet unit is accommodated in the lower limiting hole;The first rivet and the second rivet of each rivet unit are arranged in stacked assembly, and stacked assembly is located between pressure base and pressure top cover.
[0007] The upper limiting hole is located above the upper communication hole, and the upper limiting hole is in communication with the upper communication hole.
[0008] The diameter of the upper limiting hole is greater than the diameter of the upper communication hole, and the diameter of the upper limiting hole matches the diameter of the second rivet cap of the second rivet.
[0009] The diameter of the upper positioning hole is the same as the diameter of the upper communication hole.
[0010] The lower limiting hole is located below the lower communication hole, and the lower limiting hole is in communication with the lower communication hole.
[0011] The diameter of the lower limiting hole is greater than the diameter of the lower communication hole, and the diameter of the lower limiting hole matches the diameter of the first rivet cap of the first rivet.
[0012] The diameter of the lower positioning hole is the same as the diameter of the lower communication hole.
[0013] The first rivet of the rivet unit is arranged adjacent to the second rivet.
[0014] The distance between the first rivet and the second rivet of the rivet unit is 2mm.
[0015] The stacked assembly comprises at least two core plates arranged in sequence; and a semi-cured sheet is arranged between any adjacent two core plates.
[0016] Compared with the prior art, the utility model has the beneficial effects that:
[0017] The compression assembly for improving the core plate alignment precision of the PCB provided by the utility model improves the alignment precision between the core plates by adopting the combination of the compression base, the compression top cover, the plurality of rivet units and the stacked assembly, avoids the compression deformation of the first rivet cap and the second rivet cap, and finally makes the stress of the PCB in each direction uniform, so that the alignment precision between the core plates can be further improved in the compression process. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 It is a structural schematic view of the utility model;
[0019] Figure 2 It is a structural schematic view of the compression top cover;
[0020] Figure 3 It is a structural schematic view of the compression base;
[0021] Figure 4 It is a distribution schematic view of the stacked assembly and the rivet unit;
[0022] Figure 5 Fig. 2 is a schematic view of another embodiment of the press-fit top cover;
[0023] 10, press-fit base; 11, lower positioning hole; 12, lower limiting hole; 13, lower communication hole; 20, press-fit top cover; 21, upper positioning hole; 22, upper limiting hole; 23, upper communication hole; 30, rivet unit; 31, first rivet; 32, second rivet; 33, first rivet cap; 34, second rivet cap; 40, stacked assembly; 41, core board; 42, prepreg; 51, main base body; 52, threaded connecting piece. DETAILED DESCRIPTION
[0024] The utility model will be described further, combined with the drawings and specific implementation, it is to be explained that, in the premise of not conflicting, the following described each embodiment or each technical feature can be combined randomly to form new embodiment.
[0025] As Figures 1-4 shown, a kind of press-fit assembly for improving the core board alignment accuracy of pcb board, including press-fit base 10, press-fit top cover 20, multiple rivet units 30 and stacked assembly 40;The press-fit top cover 20 is provided with multiple upper positioning units, the press-fit base 10 is provided with multiple lower positioning units corresponding to multiple upper positioning units respectively, multiple rivet units 30 and multiple upper positioning units are one-to-one corresponding respectively, the rivet unit 30 includes first rivet 31 and second rivet 32;First rivet cap 33 is provided on the first rivet 31, and second rivet cap 34 is provided on the second rivet 32;The upper positioning unit includes upper positioning hole 21, upper limiting hole 22 and upper communication hole 23;The first rivet 31 of corresponding rivet unit 30 is arranged in upper positioning hole 21, the second rivet 32 of corresponding rivet unit 30 is arranged in upper communication hole 23, and the second rivet cap 34 of the second rivet 32 of corresponding rivet unit 30 is contained in upper limiting hole 22;The lower positioning unit includes lower positioning hole 11, lower limiting hole 12 and lower communication hole 13;The second rivet 32 of corresponding rivet unit 30 is arranged in lower positioning hole 11, the first rivet 31 of corresponding rivet unit 30 is arranged in lower communication hole 13, and the first rivet cap 33 of the first rivet 31 of corresponding rivet unit 30 is contained in lower limiting hole 12;The first rivet 31 and the second rivet 32 of each rivet unit 30 are arranged in stacked assembly 40, and stacked assembly 40 is located between press-fit base 10 and press-fit top cover 20.
[0026] The utility model provides a kind of for improving the core board alignment accuracy of pcb board's compression assembly, it is combined by using compression base 10, compression top cover 20, multiple rivet unit 30 and superposition component 40, compression base 10, compression top cover 20 in the process of compression almost no change, in the compression process, the reduction of the expansion of core board 41 can be prevented, especially the expansion reduction of thin core board 41, so that the expansion variation of each layer core board 41 is relatively consistent, the alignment accuracy ability between core board 41 is improved, and, still can reduce the local expansion difference of core board 41, improve the alignment accuracy ability of the position of small pitch, improve the alignment ability of superposition component 40 whole, the first rivet cap 33 of first rivet 31 is contained in lower limit hole 12, the second rivet cap 34 of second rivet 32 is contained in upper limit hole 22, so that pressure component is not contacted with first rivet cap 33, second rivet cap 34 in the process of compression, directly with compression base 10, compression top cover 20 contact, finally make the stress of superposition component 40 each direction uniform, in the process of compression, the alignment accuracy between each core board 41 can be further improved.
[0027] The thickness of the compression base 10 and the compression top cover 20 is greater than or equal to 1.0 mm, which further improves the quality and makes the compression expansion almost unchanged, so that the expansion reduction of the core board 41 can be prevented, and the expansion variation between each layer of core board 41 is relatively consistent.
[0028] The upper limit hole 22 is located above the upper communication hole 23, and the upper limit hole 22 is in communication with the upper communication hole 23. Specifically, the diameter of the upper limit hole 22 is greater than the diameter of the upper communication hole 23, and the diameter of the upper limit hole 22 matches the diameter of the second rivet cap 34 of the second rivet 32, so that the second rivet cap 34 of the second rivet 32 of the corresponding rivet unit 30 is accommodated in the upper limit hole 22, and the second rivet 32 of the corresponding rivet unit 30 is arranged in the upper communication hole 23, which can also limit the second rivet cap 34 of the second rivet 32.
[0029] Specifically, the diameter of the upper positioning hole 21 is the same as the diameter of the upper communication hole 23. The diameter of the second rivet rod of the second rivet 32 is the same as the diameter of the first rivet rod of the first rivet 31.
[0030] The lower positioning hole 12 is located below the lower communication hole 13, and the lower positioning hole 12 is communicated with the lower communication hole 13. The diameter of the lower positioning hole 12 is larger than the diameter of the lower communication hole 13, and the diameter of the lower positioning hole 12 matches the diameter of the first rivet cap 33 of the first rivet 31, so that the first rivet cap 33 of the first rivet 31 of the corresponding rivet unit 30 is accommodated in the lower positioning hole 12, the first rivet 31 of the corresponding rivet unit 30 is arranged in the lower communication hole 13, and the first rivet cap 33 of the first rivet 31 is limited.
[0031] The diameter of the lower positioning hole 11 is the same as the diameter of the lower communication hole 13.
[0032] The first rivet 31 of the rivet unit 30 is arranged adjacent to the second rivet 32.
[0033] The distance between the edges of the first rivet 31 and the second rivet 32 of the rivet unit 30 is 2mm, so that by optimizing the distance between the edges of the first rivet 31 and the second rivet 32 of the rivet unit 30, the stability of the connection can be ensured, and the expansion and contraction variation between the core plates 41 is relatively consistent.
[0034] The stacked assembly 40 comprises at least two core plates 41 arranged in sequence; and a semi-cured sheet 42 is arranged between any adjacent two core plates 41. The stacked assembly 40 further comprises an upper copper foil layer and a lower copper foil layer, the upper copper foil layer is located above the core plate 41, the lower copper foil layer is located below the core plate 41, and the semi-cured sheet 42 is arranged between the upper copper foil layer and the adjacent core plate 41 and between the lower copper foil layer and the adjacent core plate 41.
[0035] The compression base 10 and the compression top cover 20 are integrally formed, of course, in addition, the compression base 10 and the compression top cover 20 each comprise a main seat body 51 and a threaded connecting piece 52 (as shown) which is screwed on the main seat body 51. Figure 5 The upper positioning hole 22 and the upper communication hole 23 are arranged on the threaded connecting piece 52 of the compression top cover 20, and the lower positioning hole 12 and the lower communication hole are arranged on the threaded connecting piece 52 of the compression base 10, so that the parts can be replaced when damaged.
[0036] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and replacements made by those skilled in the art on the basis of the present application shall fall within the scope of protection of the present application.
Claims
1. A pressing assembly for improving the core board alignment accuracy of a PCB board, characterized in that: The application relates to a press-fit base, a press-fit top cover, a plurality of rivet units and a laminated assembly; a plurality of upper positioning units are arranged on the press-fit top cover, a plurality of lower positioning units corresponding to the plurality of upper positioning units are arranged on the press-fit base, the plurality of rivet units correspond to the plurality of upper positioning units one by one, the rivet unit comprises a first rivet and a second rivet; a first rivet cap is arranged on the first rivet, and a second rivet cap is arranged on the second rivet; the upper positioning unit comprises an upper positioning hole, an upper limiting hole and an upper communication hole; the first rivet of the corresponding rivet unit is arranged in the upper positioning hole, the second rivet of the corresponding rivet unit is arranged in the upper communication hole, and the second rivet cap of the second rivet of the corresponding rivet unit is arranged in the upper limiting hole; the lower positioning unit comprises a lower positioning hole, a lower limiting hole and a lower communication hole; the second rivet of the corresponding rivet unit is arranged in the lower positioning hole, the first rivet of the corresponding rivet unit is arranged in the lower communication hole, and the first rivet cap of the first rivet of the corresponding rivet unit is arranged in the lower limiting hole; the first rivet and the second rivet of each rivet unit are arranged in the laminated assembly, and the laminated assembly is located between the press-fit base and the press-fit top cover.
2. The press assembly for improving the core board alignment accuracy of a PCB board of claim 1, wherein: The upper limiting hole is located above the upper communication hole, and the upper limiting hole and the upper communication hole are communicated.
3. The press assembly for improving the core alignment accuracy of a PCB board of claim 2, wherein: The diameter of the upper limiting hole is larger than that of the upper communication hole, and the diameter of the upper limiting hole matches that of the second rivet cap of the second rivet.
4. The press assembly for improving the core alignment accuracy of a PCB board of claim 3, wherein: The diameter of the upper positioning hole is the same as that of the upper communication hole.
5. The press assembly for improving the core alignment accuracy of a PCB board of claim 1, wherein: The lower limiting hole is located below the lower communication hole, and the lower limiting hole and the lower communication hole are communicated.
6. The press assembly for improving the core alignment accuracy of a PCB board of claim 5, wherein: The diameter of the lower limiting hole is larger than that of the lower communication hole, and the diameter of the lower limiting hole matches that of the first rivet cap of the first rivet.
7. The press assembly for improving the core alignment accuracy of a PCB board of claim 6, wherein: The diameter of the lower positioning hole is the same as that of the lower communication hole.
8. The press assembly for improving the core alignment accuracy of a PCB board of claim 1, wherein: The first rivet and the second rivet of the rivet unit are arranged adjacently.
9. The press assembly for improving the core alignment accuracy of a PCB board of claim 1, wherein: The distance between the edges of the first rivet and the second rivet of the rivet unit is 2mm.
10. The press assembly for improving the core alignment accuracy of a PCB board of claim 1, wherein: The laminated assembly comprises at least two core plates arranged in sequence; a semi-cured sheet is arranged between any two adjacent core plates.