A pressing positioning jig for solving expansion and contraction deformation of PTFE plate

Abstract

The utility model discloses a kind of pressing positioning fixtures for solving PTFE board expansion and contraction deformation, including pressing bottom plate, the top surface of the pressing bottom plate is provided with three rows PIN pin respectively for positioning the upper part, middle part and lower part of PTFE board, each row PIN pin includes three PIN pins of equidistant side-by-side distribution, in each row PIN pin, the interval between adjacent two PIN pins is 100mm-200mm, the interval between adjacent two rows PIN pins is 200mm-300mm. The utility model effectively solves the problems of expansion and contraction deformation, core plate misregistration and the like in the PIN-LAM pressing process of PTFE board in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of PCB manufacturing and processing technology, specifically to a pressing and positioning fixture for solving the problem of expansion and contraction deformation of PTFE sheets. Background Technology

[0002] In the field of printed circuit board (PCB) manufacturing, high-precision lamination and alignment technology is a core process to ensure the quality of multilayer board products. The current mainstream lamination and alignment process flow is: OPE punching → browning → bonding and fusion → riveting → PIN-LAM (4 pins) → lamination → transfer. This process achieves precise alignment of multilayer boards during lamination by mechanically positioning four pins at the center of the four sides of the board, and is widely used in the processing and production of conventional PCB materials.

[0003] Polytetrafluoroethylene (PTFE) is increasingly widely used in high-end PCB products such as high-frequency communications and aerospace due to its excellent dielectric properties, low loss characteristics, and chemical corrosion resistance. However, the unique characteristics of PTFE sheets (the absence of fiberglass cloth) result in a high coefficient of thermal expansion and high flexibility. When using the existing PIN-LAM lamination process with 4 pins for positioning, the lack of rigid support from fiberglass cloth causes irregular (non-linear, asymmetric) expansion and contraction deformation during lamination. This directly leads to interlayer misalignment in the core board, exceeding the alignment accuracy requirements, ultimately resulting in product scrap and low yield. Utility Model Content

[0004] In order to overcome the problems of expansion and contraction deformation and core layer misalignment of PTFE sheets during PIN-LAM pressing in the prior art, this utility model provides a pressing positioning fixture to solve the problem of expansion and contraction deformation of PTFE sheets.

[0005] The technical solution of this utility model is as follows: A pressing and positioning fixture for solving the expansion and contraction deformation of PTFE sheets includes a pressing base plate. The top surface of the pressing base plate is provided with three rows of pins for positioning the upper, middle and lower parts of the PTFE sheet. Each row of pins includes three pins that are equally spaced and arranged side by side. In each row of pins, the distance between two adjacent pins is 100mm-200mm, and the distance between two adjacent rows of pins is 200mm-300mm.

[0006] As a preferred embodiment of this utility model, in each row of PIN pins, the distance between two adjacent PIN pins is 100mm.

[0007] As a preferred embodiment of this utility model, in each row of PIN pins, the distance between two adjacent PIN pins is 150mm.

[0008] As a preferred embodiment of this utility model, in each row of PIN pins, the distance between two adjacent PIN pins is 200mm.

[0009] As a preferred embodiment of this utility model, the spacing between two adjacent rows of PIN pins is 200mm.

[0010] As a preferred embodiment of this utility model, the spacing between two adjacent rows of PIN pins is 250mm.

[0011] As a preferred embodiment of this utility model, the spacing between two adjacent rows of PIN pins is 300mm.

[0012] As a preferred embodiment of this utility model, the length of the PIN pin is 30mm-34mm.

[0013] As a preferred embodiment of this utility model, the PIN pin is a columnar body, wherein two opposite sides of the columnar body are flat surfaces and the other two opposite sides are curved surfaces.

[0014] As a preferred embodiment of this utility model, the top of the column is provided with a first R-angle on both sides corresponding to the plane, and the top of the column is provided with a second R-angle on both sides corresponding to the arc surface.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. By using three rows of pins (three in each row) on the top surface of the pressing base plate, a comprehensive positioning system for the upper, middle and lower parts of the PTFE sheet is formed. This changes the limitation of the traditional four pins which only position the four sides at the center. It can effectively constrain the irregular expansion and contraction deformation of the PTFE sheet during the pressing process, reduce the interlayer misalignment problem caused by deformation, and significantly improve the positioning stability. 2. Designed to address the characteristics of PTFE material, such as lack of fiberglass cloth support, high coefficient of thermal expansion, and flexibility, the multi-row pin design provides denser support points, better addressing the deformation issues that easily occur due to the lack of rigid support. This overcomes the shortcomings of traditional processes in handling this type of material and expands the applicability of the lamination process to high-end PCB materials. 3. It effectively solves the problem of misalignment between core board layers caused by expansion and contraction deformation, ensuring that the product alignment accuracy meets the requirements, reducing product scrap due to inaccurate positioning, thereby significantly improving the production yield of PTFE multilayer boards and reducing production costs. 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 the pressing and positioning fixture in one embodiment of the present invention; Figure 2 This is a side view of a PIN pin in one embodiment of the present invention; Figure 3 This is a top view of a PIN pin in one embodiment of the present invention.

[0018] In the diagram, 1. Press-fit base plate; 2. Pin pin; 21. Flat surface; 22. Curved surface; 23. First radius (R-angle); 24. Second radius (R-angle). 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 are not intended to 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 of this application.

[0021] Please see Figure 1The present invention provides a pressing and positioning fixture for solving the expansion and contraction deformation of PTFE sheet, including a pressing base plate 1. The top surface of the pressing base plate 1 is provided with three rows of pin pins 2 for positioning the upper, middle and lower parts of the PTFE sheet respectively. Each row of pin pins 2 includes three pin pins 2 that are equally spaced and arranged side by side.

[0022] In each row of pins 2, the spacing between two adjacent pins 2 is 100mm-200mm, and the spacing between two adjacent rows of pins 2 is 200mm-300mm. By controlling the spacing between two adjacent pins 2 in each row to 100mm-200mm, sufficient positioning point density is ensured, effectively constraining the sheet metal area between each pin and preventing uncontrolled deformation in the middle area due to excessive spacing. Conversely, excessively small spacing does not increase the processing cost and installation difficulty of the fixture, and also provides a buffer space for minor deformation of the sheet metal during the pressing process. By controlling the spacing between two adjacent rows of pins to 200mm-300mm, the distribution of the three rows of pins on the sheet metal is more scientific and reasonable. This spacing ensures effective coverage of different parts of the sheet metal by each row of pins, while avoiding an overly compact fixture structure due to excessively small spacing, which would affect the uniformity of stress on the sheet metal during pressing and the operating space of the pressing equipment.

[0023] The pressing and positioning fixture in this embodiment, through the layout of three rows of pins (three in each row) on the top surface of the pressing base plate 1, forms a comprehensive positioning system for the upper, middle, and lower parts of the PTFE sheet. This changes the limitation of the traditional four-pin positioning which only positions the four sides at the center. It can effectively constrain the irregular expansion and contraction deformation of the PTFE sheet during the pressing process, reduce interlayer misalignment caused by deformation, and significantly improve positioning stability. Designed to address the characteristics of PTFE material—no fiberglass cloth support, high coefficient of thermal expansion, and flexibility—the multi-row pins provide denser support points, better addressing the deformation problem that easily occurs due to the lack of rigid support. This compensates for the shortcomings of traditional processes when handling this type of material, expanding the applicability of the pressing process to high-end PCB materials. It effectively solves the problem of interlayer misalignment of the core board caused by expansion and contraction deformation, ensuring that the product alignment accuracy meets requirements, reducing product scrap due to inaccurate positioning, thereby significantly improving the production yield of multilayer PTFE sheets and reducing production costs.

[0024] In one embodiment, the spacing between two adjacent pins 2 in each row is 150mm; the spacing between two adjacent rows of pins 2 is 250mm. The 150mm spacing within a single row creates uniform constraint points within the single row area of ​​the sheet material, preventing insufficient support in the middle area due to excessive spacing, while also reducing stress concentration caused by insufficient spacing. The 250mm row spacing allows for more balanced vertical coverage of the sheet material by the upper, middle, and lower rows of pins, adapting to the pressing requirements of most standard-sized PTFE sheets. This spacing combination satisfies the deformation constraint requirements caused by the flexibility of PTFE material and is compatible with the positioning groove accuracy of existing pressing equipment. Precise positioning can be achieved without significant adjustments to equipment parameters, making it suitable for mass production scenarios.

[0025] In one embodiment, in each row of pins 2, the spacing between two adjacent pins 2 is 100mm; the spacing between two adjacent rows of pins 2 is 200mm. This spacing combination is suitable for precise positioning of small-sized PTFE sheets.

[0026] In one embodiment, in each row of pins 2, the spacing between two adjacent pins 2 is 200mm; the spacing between two adjacent rows of pins 2 is 300mm. This spacing combination is suitable for precise positioning of large PTFE sheets.

[0027] In one embodiment, the length of the PIN pin 2 is 30mm-34mm, preferably 32mm, and this length of PIN pin 2 is compatible with the pressing and positioning of most PTFE sheet multilayer boards.

[0028] Please see Figure 2 , Figure 3 In one embodiment, the PIN pin 2 is a columnar body, with two opposite sides being flat surfaces 21 and the other two opposite sides being curved surfaces 22. A first radius angle 23 is provided on the top of the columnar body corresponding to the two sides of the curved surfaces 22, and a second radius angle 24 is provided on the top of the columnar body corresponding to the two sides of the flat surfaces 21. The columnar structure of the curved surfaces 22 and flat surfaces 21 creates a composite force-bearing mode where the PIN pin contacts the positioning hole of the PTFE sheet, with the curved surface 22 providing support and the flat surface 21 providing guidance. The curved surface 22 reduces local compressive stress on the hole wall of the sheet, preventing cracking during pressing; the flat surface 21 provides lateral limiting guidance, preventing the sheet from rotating circumferentially along the pin during pressing, ensuring interlayer alignment accuracy. The first radius angle 23 and the second radius angle eliminate right-angle stress concentration points at the curved surface 22, flat surface 21, and top edge, preventing burrs or tearing at the edge of the positioning hole of the sheet due to stress during pressing. It also facilitates quick insertion of the PIN pin into the positioning hole of the sheet, improving feeding efficiency.

[0029] In one specific embodiment, the diameter of both arc surfaces 22 is 6mm-7mm, preferably 6.35mm, and the distance between the two planes 21 is 4.5mm-5mm, preferably 4.76mm. The aforementioned diameter of the arc surfaces 22 ensures a relatively large and uniform contact area when the PIN pin 2 contacts the positioning hole of the PTFE sheet. During the pressing process, the arc surfaces 22 contact the hole wall of the sheet, effectively dispersing pressure and reducing local compressive stress on the hole wall, thereby reducing the risk of hole wall cracking during pressing and ensuring the integrity and quality of the sheet. The distance between the two planes 21 provides effective lateral limiting and guiding for the sheet. During the pressing process, it prevents the sheet from rotating circumferentially along the pin, ensuring interlayer alignment accuracy, thereby reducing interlayer misalignment caused by sheet rotation and improving product alignment accuracy.

[0030] In one specific embodiment, the radius of the first R-angle 23 is 0.3mm-0.5mm, and the radius of the second R-angle 24 is 1.5mm. The aforementioned radius of the first R-angle 23 effectively eliminates the right-angle stress concentration point between the curved surface 22 and the top edge. During the pressing process, it prevents burrs or tearing at the edges of the plate positioning holes due to stress, improving the processing quality of the plate and the product yield. The aforementioned radius of the second R-angle 24 more effectively eliminates the right-angle stress concentration point between the plane 21 and the top edge. Since the plane 21 mainly serves as a lateral limiting and guiding function, the larger second R-angle 24 can better protect the edges of the plate positioning holes, preventing edge damage due to stress concentration during the pressing process.

[0031] 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.

[0032] 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 pressing and positioning fixture for solving the expansion and contraction deformation of PTFE sheets, characterized in that, The device includes a pressing base plate, the top surface of which is provided with three rows of pins for positioning the upper, middle and lower parts of the PTFE sheet. Each row of pins includes three pins that are equally spaced and arranged side by side. In each row of pins, the distance between two adjacent pins is 100mm-200mm, and the distance between two adjacent rows of pins is 200mm-300mm.

2. The pressing and positioning fixture for solving the expansion and contraction deformation of PTFE sheets according to claim 1, characterized in that, In each row of pins, the spacing between two adjacent pins is 100mm.

3. The pressing and positioning fixture for solving the expansion and contraction deformation of PTFE sheets according to claim 1, characterized in that, In each row of pins, the spacing between two adjacent pins is 150 mm.

4. The pressing and positioning fixture for solving the expansion and contraction deformation of PTFE sheets according to claim 1, characterized in that, In each row of PIN pins, the spacing between two adjacent PIN pins is 200mm.

5. The pressing and positioning fixture for solving the expansion and contraction deformation of PTFE sheets according to claim 1, characterized in that, The spacing between two adjacent rows of PIN pins is 200mm.

6. The pressing and positioning fixture for solving the expansion and contraction deformation of PTFE sheets according to claim 1, characterized in that, The spacing between two adjacent rows of PIN pins is 250mm.

7. The pressing and positioning fixture for solving the expansion and contraction deformation of PTFE sheets according to claim 1, characterized in that, The spacing between two adjacent rows of PIN pins is 300mm.

8. The pressing and positioning fixture for solving the expansion and contraction deformation of PTFE sheets according to claim 1, characterized in that, The length of the PIN pin is 30mm-34mm.

9. The pressing and positioning fixture for solving the expansion and contraction deformation of PTFE sheets according to claim 1, characterized in that, The PIN pin is a columnar body, with two opposite sides being flat and the other two opposite sides being curved.

10. The pressing and positioning fixture for solving the expansion and contraction deformation of PTFE sheets according to claim 9, characterized in that, The top of the column is provided with a first radius (R-angle) on both sides corresponding to the plane, and the top of the column is provided with a second radius (R-angle) on both sides corresponding to the arc surface.

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