Steel mesh

Abstract

The utility model belongs to the technical field of SMT (Surface Mount Technology), and discloses a steel mesh, which comprises a supporting mesh and a covering mesh, the supporting mesh is provided with an accommodating hole and an avoiding hole, the covering mesh is provided with an operation hole, when operation is carried out at an operation position on a substrate with an existing structure, the supporting mesh is clamped between the substrate and the covering mesh, and the covering mesh is provided with an operation hole. The containing hole annularly sleeves the periphery of the existing structure, the operation hole is communicated with the avoiding hole, the containing hole annularly sleeves the periphery of the operation position, and the covering mesh and the existing structure in the containing hole are spaced. According to the utility model, the supporting mesh and the covering mesh can be processed only through simple punching, the production cost is low, the processing precision is high, the supporting mesh is matched with the covering mesh, the supporting mesh protects the existing structure on the substrate through the accommodating holes, the covering mesh is prevented from contacting, extruding, damaging or polluting the existing structure, and the service life of the substrate is prolonged. And the receding holes in the supporting net piece communicate with the operation holes in the covering net piece, and operation can be conducted on the operation position on the base plate.

Description

Technical Field

[0001] The utility model relates to the technical field of SMT, in particular to a stencil. Background Art

[0002] SMT (Surface Mount Technology) is a technology for mounting leadless or short-lead surface mount components on the surface of a printed circuit board or other substrates.

[0003] A stencil is a special mold for SMT, which is used to transfer solder paste to a set position on a circuit board. When using an existing stencil for solder paste printing, the bottom of the stencil will contact, squeeze, damage or contaminate existing structures such as flux and pads. To solve this problem, in the prior art, avoidance grooves are processed on the stencil, and the existing structures are sleeved and avoided through the avoidance grooves.

[0004] However, the cost of processing grooves on the stencil is relatively high, and after processing, the structural strength of the stencil is affected, making the groove position prone to collapse and squeeze the existing structures during solder paste printing. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a stencil that can simply and efficiently accommodate and protect existing structures.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A stencil, comprising:

[0008] A support mesh, which is provided with accommodation holes and avoidance holes;

[0009] A covering mesh, which is provided with operation holes. When operating at an operation position on a substrate provided with existing structures, the support mesh is clamped between the substrate and the covering mesh. The accommodation holes are sleeved around the outer periphery of the existing structures, the operation holes are communicated with the avoidance holes and are sleeved around the outer periphery of the operation position, the covering mesh covers the accommodation holes, and the covering mesh and the existing structures in the accommodation holes are spaced apart.

[0010] Preferably, when a plurality of the support meshes are clamped between the substrate and the covering mesh, the accommodation holes at the same position are sequentially communicated, and the avoidance holes at the same position are sequentially communicated.

[0011] Preferably, when a plurality of the support meshes are clamped between the substrate and the covering mesh, the diameters of the accommodation holes at the same position on at least two of the support meshes are different.

[0012] Preferably, the support mesh is provided with a plurality of accommodation holes.

[0013] Preferably, when a plurality of the support meshes are sandwiched between the substrate and the covering mesh, the number of the accommodation holes on at least two of the support meshes is different.

[0014] Preferably, when a plurality of the support meshes are sandwiched between the substrate and the covering mesh, the aperture diameters of the accommodation holes at the same position on at least two of the support meshes are different, and the number of the accommodation holes on at least two of the support meshes is different.

[0015] Preferably, the aperture diameters of the plurality of accommodation holes of the support mesh are different.

[0016] Preferably, a positioning post is further included. The support mesh is provided with a first positioning hole, the covering mesh is provided with a second positioning hole, and the positioning post penetrates through the first positioning hole and the second positioning hole.

[0017] Preferably, the cross section of the positioning post is polygonal or elliptical.

[0018] Preferably, the thickness of the support mesh is H, the thickness of the covering mesh is h, and h ≤ H ≤ 2h.

[0019] Advantages of the present utility model:

[0020] The support mesh and the covering mesh can be obtained only by simple punching, with low production cost and high processing precision. The support mesh and the covering mesh cooperate with each other. The support mesh protects the existing structure on the substrate through the accommodation holes, avoiding the covering mesh from contacting, squeezing, damaging or contaminating the existing structure, and the avoidance holes on the support mesh communicate with the operation holes on the covering mesh, enabling operations on the operation positions on the substrate. Description of the drawings

[0021] Figure 1 is a cross-sectional view of the steel mesh and the substrate according to the first embodiment of the present utility model;

[0022] Figure 2 is a cross-sectional view of the steel mesh and the substrate according to the second embodiment of the present utility model;

[0023] Figure 3 is a cross-sectional view of the steel mesh and the substrate according to the third embodiment of the present utility model;

[0024] Figure 4 is a cross-sectional view of the steel mesh and the substrate according to the fourth embodiment of the present utility model;

[0025] Figure 5It is a cross-sectional view of the cooperation between the steel mesh and the substrate described in the fifth embodiment of the present utility model.

[0026] In the figure:

[0027] 1. Support mesh; 11. Accommodating hole; 12. Avoidance hole;

[0028] 2. Covering mesh; 21. Operation hole;

[0029] 100. Existing structure; 200. Substrate. Specific implementation manner

[0030] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar components or components with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0031] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium. It can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] In the description of the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first feature and the second feature, or may include the situation where the first feature and the second feature are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the horizontal height of the first feature is lower than that of the second feature.

[0033] The technical solution of the present utility model will be further described below in conjunction with the drawings and through specific implementation manners.

[0034] As Figures 1 - 5As shown in the figure, the utility model provides a stencil, which includes a supporting mesh sheet 1 and a covering mesh sheet 2. Among them, the supporting mesh sheet 1 is provided with accommodation holes 11 and avoidance holes 12, and the covering mesh sheet 2 is provided with operation holes 21. When operating at the operation position on the substrate 200 provided with the existing structure 100, the supporting mesh sheet 1 is clamped between the substrate 200 and the covering mesh sheet 2. The accommodation holes 11 are sleeved on the outer periphery of the existing structure 100, and the operation holes 21 and the avoidance holes 12 are communicated with each other and sleeved on the outer periphery of the operation position. The covering mesh sheet 2 covers the accommodation holes 11, and there is a gap between the covering mesh sheet 2 and the existing structure 100 in the accommodation holes 11.

[0035] In the utility model, the supporting mesh sheet 1 and the covering mesh sheet 2 can be obtained only by simple punching, with low production cost and high processing precision. The supporting mesh sheet 1 and the covering mesh sheet 2 cooperate with each other. The supporting mesh sheet 1 protects the existing structure 100 on the substrate 200 through the accommodation holes 11, avoiding the covering mesh sheet 2 from contacting, squeezing, damaging or contaminating the existing structure 100. Moreover, the avoidance holes 12 on the supporting mesh sheet 1 and the operation holes 21 on the covering mesh sheet 2 are communicated with each other, enabling operation on the operation position on the substrate 200.

[0036] Specifically, the supporting mesh sheet 1 is provided with a plurality of accommodation holes 11. With the above setting, it is possible to accommodate and protect multiple existing structures 100 at different positions on the substrate 200 according to requirements.

[0037] More specifically, the diameters of the plurality of accommodation holes 11 on the supporting mesh sheet 1 are different. With the above setting, the plurality of accommodation holes 11 can respectively adapt to existing structures 100 with different diameter sizes.

[0038] In this embodiment, the existing structure 100 on the substrate 200 is solder flux, solder pads, etc., which are obtained by printing and assembling on the substrate 200 with a conventional stencil in the prior art. After the printing and assembly of the existing structure 100 are completed, the supporting mesh sheet 1 and the covering mesh sheet 2 are sequentially laid on the substrate 200 to print and assemble a new structure at the operation position. At this time, the supporting mesh sheet 1 can avoid and protect the existing structure 100. In specific use, one or more supporting mesh sheets 1 can be clamped between the substrate 200 and the covering mesh sheet 2 according to needs.

[0039] In other embodiments, the supporting mesh sheet 1 can also be provided with only one accommodation hole 11 to focus on accommodating and protecting one existing structure 100 on the substrate 200.

[0040] In other embodiments, the supporting mesh sheet 1 is provided with a plurality of accommodation holes 11, and the diameters of the plurality of accommodation holes 11 are the same, thereby reducing the preparation and adaptation costs.

[0041] Specifically, when a plurality of support meshes 1 are sandwiched between the substrate 200 and the covering mesh 2, the plurality of accommodation holes 11 at the same position are sequentially communicated, and the plurality of avoidance holes 12 at the same position are sequentially communicated. In the above arrangement, the sequential communication of the plurality of accommodation holes 11 can effectively accommodate the existing structure 100 with a larger height dimension.

[0042] In one embodiment, as Figure 2 shown, when two support meshes 1 are sandwiched between the substrate 200 and the covering mesh 2, the two accommodation holes 11 at the same position are sequentially communicated, and the two avoidance holes 12 at the same position are sequentially communicated and then communicated with the operation hole 21.

[0043] More specifically, when a plurality of support meshes 1 are sandwiched between the substrate 200 and the covering mesh 2, the diameters of the accommodation holes 11 at the same position on at least two support meshes 1 are different. In the above arrangement, the different diameters of the accommodation holes 11 at the same position can effectively accommodate the existing structure 100 with a large variation in diameter dimension along the height direction.

[0044] In one embodiment, as Figure 4 shown, two support meshes 1 are sandwiched between the substrate 200 and the covering mesh 2. The diameters of the two accommodation holes 11 at the same position on the right side of the two support meshes 1 are different. The diameter of the upper accommodation hole 11 is smaller, and the diameter of the lower accommodation hole 11 is larger. The two accommodation holes 11 cooperate to be able to adapt to the existing conical structure 100.

[0045] Specifically, when a plurality of support meshes 1 are sandwiched between the substrate 200 and the covering mesh 2, the number of accommodation holes 11 on at least two support meshes 1 is different. The above arrangement enables the accommodation holes 11 to adapt to the existing structure 100 with different height dimensions.

[0046] In one embodiment, as Figure 3 shown, two support meshes 1 are sandwiched between the substrate 200 and the covering mesh 2. At the same position on the left side of the two support meshes 1, the upper support mesh 1 is not provided with an accommodation hole 11, and the lower support mesh 1 is provided with an accommodation hole 11. The upper and lower support meshes 1 cooperate to enable the accommodation hole 11 to adapt to the existing structure 100 with a smaller height dimension, ensuring the structural strength at this position.

[0047] Specifically, when a plurality of support meshes 1 are sandwiched between the substrate 200 and the covering mesh 2, the diameters of the accommodation holes 11 at the same position on at least two support meshes 1 are different, and the number of accommodation holes 11 on at least two support meshes 1 is different.

[0048] In one embodiment, as Figure 5As shown in the figure, two support meshes 1 are clamped between the substrate 200 and the covering mesh 2. At the same position on the left side of the two support meshes 1, the upper support mesh 1 is not provided with a receiving hole 11, while the lower support mesh 1 is provided with a receiving hole 11. The upper and lower support meshes 1 cooperate with each other, enabling the receiving hole 11 to adapt to the existing structure 100 with a relatively small height dimension, ensuring the structural strength at this position. At the same position on the right side of the two support meshes 1, the apertures of the two receiving holes 11 are different. The aperture of the upper receiving hole 11 is smaller, and the aperture of the lower receiving hole 11 is larger. The two receiving holes 11 cooperate with each other to be able to adapt to the existing structure 100 with a conical structure.

[0049] Specifically, the steel mesh further includes positioning posts 3. The support mesh 1 is provided with first positioning holes, and the covering mesh 2 is provided with second positioning holes. The positioning posts 3 are inserted through the first positioning holes and the second positioning holes. By providing the positioning posts 3, when the support mesh 1 and the covering mesh 2 are laid on the substrate 200, the positioning between them is more accurate.

[0050] In this embodiment, the cross-section of the positioning post 3 is polygonal or elliptical. The above setting avoids the covering mesh 2 deflecting relative to the support mesh 1 with the positioning post 3 as the reference.

[0051] In other embodiments, the cross-section of the positioning post 3 can also be other structures, as long as it is ensured that the covering mesh 2 cannot deflect relative to the support mesh 1.

[0052] In other embodiments, the support mesh 1 is provided with a plurality of first positioning holes, and the covering mesh 2 is provided with a plurality of second positioning holes. One positioning post 3 is inserted into the first positioning hole and the second positioning hole at the same position.

[0053] Specifically, the thickness of the support mesh 1 is H, and the thickness of the covering mesh 2 is h, where h ≤ H ≤ 2h. The above setting enables the depth of the receiving hole 11 to reach 1 / 2 - 2 / 3 of the thickness of the overall structure of the steel mesh when one support mesh 1 and one covering mesh 2 cooperate, meeting the requirements of actual processing and production.

[0054] In one embodiment, the cross-sectional dimension of the existing structure 100 is 0.1mm X 0.1mm, the cross-sectional dimension of the receiving hole 11 is 0.12mm X 0.12mm, the thickness of the overall structure of the steel mesh is 50um, the thickness of the support mesh 1 is 30um, and the thickness of the covering mesh 2 is 20um.

[0055] In summary, the steel mesh of the present utility model has guaranteed strength and can simply and efficiently achieve the accommodation and protection of the existing structure 100.

[0056] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. Steel mesh, characterized in that, include: A supporting mesh (1), wherein the supporting mesh (1) is provided with a receiving hole (11) and an avoidance hole (12); A cover mesh (2) is provided with an operation hole (21). When working at an operation position on a substrate (200) provided with an existing structure (100), the support mesh (1) is sandwiched between the substrate (200) and the cover mesh (2). The receiving hole (11) is sleeved on the outer periphery of the existing structure (100). The operation hole (21) and the avoidance hole (12) are connected and sleeved on the outer periphery of the operation position. The cover mesh (2) covers the receiving hole (11). The cover mesh (2) and the existing structure (100) in the receiving hole (11) are spaced apart.

2. The steel mesh according to claim 1, characterized in that: When a plurality of the supporting mesh sheets (1) are sandwiched between the base plate (200) and the cover mesh sheet (2), a plurality of the accommodating holes (11) at the same position are connected in sequence, and a plurality of the avoiding holes (12) at the same position are connected in sequence.

3. The steel mesh according to claim 1, characterized in that: When a plurality of the supporting mesh sheets (1) are sandwiched between the base plate (200) and the covering mesh sheet (2), the apertures of the accommodating holes (11) at the same position on at least two of the supporting mesh sheets (1) are different.

4. The steel mesh according to claim 1, characterized in that: The supporting mesh (1) is provided with a plurality of accommodating holes (11).

5. The steel mesh according to claim 4, characterized in that: When a plurality of the supporting mesh sheets (1) are sandwiched between the base plate (200) and the covering mesh sheet (2), the number of the accommodating holes (11) on at least two of the supporting mesh sheets (1) is different.

6. The steel mesh according to claim 4, characterized in that: When a plurality of the supporting mesh sheets (1) are sandwiched between the base plate (200) and the cover mesh sheet (2), the apertures of the receiving holes (11) at the same position on at least two of the supporting mesh sheets (1) are different, and the number of the receiving holes (11) on at least two of the supporting mesh sheets (1) is different.

7. The steel mesh according to claim 4, characterized in that: The apertures of the plurality of accommodating holes (11) of the supporting mesh (1) are different.

8. The steel mesh according to claim 1, characterized in that: It also comprises a positioning column (3), the supporting mesh (1) is provided with a first positioning hole, the covering mesh (2) is provided with a second positioning hole, and the positioning column (3) is inserted into the first positioning hole and the second positioning hole.

9. The steel mesh according to claim 8, characterized in that: The cross section of the positioning column (3) is polygonal or elliptical.

10. The steel mesh according to any one of claims 1 to 9, characterized in that: The thickness of the supporting mesh (1) is H, the thickness of the covering mesh (2) is h, and h≤H≤2h.

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