Precise super-long SMT (Surface Mount Technology) screen
By designing a precision ultra-long SMT screen, the problem of reducing printing accuracy in solder paste printing of ultra-long circuit boards is solved, and higher printing accuracy and circuit board yield are achieved, reducing manufacturing costs.
Patent Information
- Application Number
- CN202421596936.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-08
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-07-08
AI Technical Summary
During the solder paste printing process of ultra-long circuit boards, the use of multiple small screens combined printing results in a reduced printing accuracy, affecting the yield of the circuit board and increasing manufacturing costs.
A precision ultra-long SMT mesh plate is designed, which adopts rectangular printed steel plates, with several printing holes on the surface, and is connected to the printed steel plate through a steel plate fixing frame. The fixing glue layer reinforces the steel plate, and the positioning holes match the solder paste coating equipment to enhance the ribs and improve the bending resistance.
Through the design of the precision ultra-long SMT mesh, the accuracy of solder paste printing is improved, the bending and deformation of the mesh during handling and printing is reduced, the yield of the circuit board is improved, and the manufacturing cost is reduced.
Smart Images
Figure CN222884896U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of printed circuit manufacturing, in particular to a precise super-long SMT stencil. Background Art
[0002] Stencil, also known as silk screen, steel mesh; used for solder paste printing, SMT surface mount technology industry essential basic supplies, the solder paste is printed on the PCB printed circuit board for patch and solder reflow. As the circuits on the circuit board are becoming more and more compact, this requires the SMT stencil to have higher precision. At present, the solder paste printing of large circuit boards mostly uses multiple small stencils for combined printing, resulting in reduced printing accuracy, affecting the yield of the circuit board and increasing the manufacturing cost of the enterprise. Therefore, a precision super-long SMT stencil is proposed to solve the above problems. Utility Model Content
[0003] In order to solve the above technical problems, a precision extra-long SMT stencil is provided. This technical solution solves the problem that a plurality of small stencils are used for combined printing on extra-long circuit boards, resulting in reduced printing accuracy and affecting the yield rate of the circuit boards.
[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0005] A precision extra-long SMT stencil comprises a printed steel plate, which is rectangular in shape. A plurality of printing holes are provided on the surface of the printed steel plate, and the printing holes penetrate the printed steel plate. A steel plate fixing frame for fixing the printed steel plate is connected to the outer side of the printed steel plate, and a fixing adhesive layer for reinforcing the printed steel plate is coated at the connection between the printed steel plate and the steel plate fixing frame.
[0006] Preferably, a plurality of positioning holes are provided below the steel plate fixing frame, and the positioning holes are truncated cone-shaped and evenly arranged.
[0007] Preferably, the steel plate fixing frame is made by welding a plurality of metal pipes, and reinforcing ribs are fixedly connected inside the steel plate fixing frame.
[0008] Preferably, a groove for inserting the printed steel plate is provided on the inner side of the steel plate fixing frame.
[0009] Preferably, the position of the printed hole corresponds to the welding position of the component.
[0010] Preferably, the fixing adhesive layer is made of epoxy resin adhesive and is evenly coated around the printed steel plate.
[0011] Compared with the prior art, the utility model has the following beneficial effects:
[0012] 1. The printed steel plate is fixed by a steel plate fixing frame, and a fixed adhesive layer is coated between the printed steel plate and the steel plate fixing frame to further fix the printed steel plate. Reinforcing ribs are arranged inside the steel plate fixing frame to enhance its anti-bending ability, so that the stencil is not easy to bend and deform during transportation and solder paste printing, and the printing accuracy will not be reduced.
[0013] 2. There are multiple positioning holes under the steel plate fixing frame. The positioning holes match the positioning pins on the solder paste coating equipment to accurately position the stencil during solder paste printing to improve printing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the structure of the utility model;
[0015] Figure 2 It is a bottom view structural schematic diagram of the utility model;
[0016] Figure 3 It is a schematic diagram of the internal structure of the steel plate fixing frame in the utility model.
[0017] The numbers in the figure are:
[0018] 1. Printing steel plate; 11. Printing hole; 2. Steel plate fixing frame; 21. Fixed adhesive layer; 22. Positioning hole; 23. Reinforcing rib. DETAILED DESCRIPTION
[0019] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.
[0020] like Figure 1 As shown, a precision extra-long SMT stencil comprises a printed steel plate 1, which is rectangular in configuration. A plurality of printing holes 11 are provided on the surface of the printed steel plate 1, and the printing holes 11 penetrate the printed steel plate 1. The positions of the printing holes 11 correspond to the welding positions of the components. The holes are opened by laser cutting with extremely high precision. A steel plate fixing frame 2 for fixing the printed steel plate 1 is connected to the outer side of the printed steel plate 1. A groove for inserting the printed steel plate 1 is provided on the inner side of the steel plate fixing frame 2. The steel plate fixing frame 2 provides support for the printed steel plate 1, and facilitates the movement and placement of the printed steel plate 1. A fixed adhesive layer 21 for reinforcing the printed steel plate 1 is coated at the connection between the printed steel plate 1 and the steel plate fixing frame 2. The fixed adhesive layer 21 is made of epoxy resin adhesive and is evenly coated on all sides of the printed steel plate 1. The epoxy resin adhesive is mainly composed of epoxy resin and curing agent, and has good bonding performance and corrosion resistance. The fixed adhesive layer 21 further fixes the printed steel plate 1.
[0021] like Figure 2As shown, a plurality of positioning holes 22 are provided below the steel plate fixing frame 2. The positioning holes 22 are truncated cone-shaped and evenly arranged. The positioning holes 22 match the positioning pins on the solder paste coating device to accurately position the stencil when solder paste printing is performed.
[0022] like Figure 3 As shown, the steel plate fixing frame 2 is made by welding multiple metal tubes, and the steel plate fixing frame 2 is fixedly connected with reinforcing ribs 23 inside. The bending resistance of the steel plate fixing frame 2 is enhanced by arranging the reinforcing ribs 23 inside the metal tubes, thereby improving the accuracy of the mesh. While improving the strength of the steel plate fixing frame 2, it also avoids using solid metal rods to increase the overall weight of the mesh, making it convenient for staff to take the mesh.
[0023] The principle of the utility model is as follows: when printing solder paste on an extra-long circuit board, the positioning holes 22 on the stencil are aligned with the positioning pins on the solder paste coating equipment and installed to achieve accurate positioning of the stencil for solder paste printing. A fixed adhesive layer 21 is coated around the printing steel plate 1 to fix the printing steel plate 1 to the fixed frame. Reinforcing ribs 23 are arranged inside the fixed frame. The reinforcing ribs 23 enhance the bending resistance of the fixed frame. The stencil is not prone to bending during use, which may cause a decrease in the accuracy of the stencil. Extremely high precision is always maintained during the solder paste printing process on the extra-long circuit board.
[0024] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the specification only describe the principles of the utility model. The utility model may be subject to various changes and improvements without departing from the spirit and scope of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.
Claims
1. A precision super-long SMT stencil, characterized by: The invention comprises a printing steel plate (1), wherein the printing steel plate (1) is rectangular in shape, a plurality of printing holes (11) are provided on the surface of the printing steel plate (1), the printing holes (11) penetrate the printing steel plate (1), a steel plate fixing frame (2) for fixing the printing steel plate (1) is connected to the outer side of the printing steel plate (1), and a fixing adhesive layer (21) for reinforcing the printing steel plate (1) is coated at the connection between the printing steel plate (1) and the steel plate fixing frame (2).
2. The precision super-long SMT stencil according to claim 1, characterized in that: A plurality of positioning holes (22) are provided below the steel plate fixing frame (2), and the positioning holes (22) are truncated cone-shaped and evenly arranged.
3. The precision super-long SMT stencil according to claim 1, characterized in that: The steel plate fixing frame (2) is made by welding a plurality of metal pipes, and a reinforcing rib (23) is fixedly connected inside the steel plate fixing frame (2).
4. The precision super-long SMT stencil according to claim 1, characterized in that: The inner side of the steel plate fixing frame (2) is provided with a groove for inserting the printed steel plate (1).
5. The precision super-long SMT stencil according to claim 1, characterized in that: The positions of the plurality of printing holes (11) correspond to the welding positions of components.
6. The precision super-long SMT stencil according to claim 1, characterized in that: The material of the fixed adhesive layer (21) is epoxy resin adhesive and is evenly coated around the printed steel plate (1).