A composite structure solder paste steel mesh

Abstract

The invention relates to the technical field of semiconductor chip bonding equipment, and discloses a composite structure solder paste steel mesh, comprising a laser steel mesh frame, a laser steel mesh pressing plate located above the laser steel mesh frame, and a laser steel mesh pressed between the laser steel mesh frame and the laser steel mesh pressing plate by bolts; the invention has a simple structure, is easy to install, has low maintenance cost, and is easy to switch when adapting to different products; the laser steel mesh prepared by laser cutting technology has extremely high opening accuracy and consistency, and meets the needs of high-density and high-precision SMT production lines; the solder paste steel mesh can be customized according to different PCB board designs to adapt to different pin spacings and layouts; the cooperation of demoulding spring pins and quick clamping hooks makes the installation and disassembly of the steel mesh more convenient, and further improves the production efficiency; the design of the frame positioning pin sealing ring and the demoulding spring pin sealing ring provides good sealing performance, and prevents the leakage and contamination of solder paste.

Description

Technical Field

[0001] The invention relates to the technical field of semiconductor chip bonding equipment, in particular to a composite structure solder paste steel mesh. Background Art

[0002] At present, all the die bonders and clamping devices on the market can only perform glue dispensing on the surface of bare lead frames and die bonded lead frames. Since the number of products contained in a lead frame is usually hundreds, in order to meet the increasingly high UPH requirements of customers, it can only be achieved by connecting multiple machines in parallel or installing multiple glue dispensing mechanisms on one machine. This inevitably leads to an increase in costs. In addition, it is difficult to control the position accuracy and size consistency of the glue dispensing mechanism for dispensing hundreds of products on a lead frame.

[0003] In order to realize the solder paste brushing process, a printed steel mesh needs to be matched with the glue brushing mechanism. There are generally two structural types of printed steel meshes, namely, a printed steel mesh or an aluminum frame steel mesh carved from a whole piece of material.

[0004] The printing steel mesh that is carefully carved from a whole piece of material has very high requirements on processing machine tools, processing technology, steel mesh material, surface treatment technology, etc., and is very expensive.

[0005] Although aluminum frame steel mesh is low-cost, each aluminum frame steel mesh can only correspond to different products one by one. When changing the model of the product, you need to replace another model of steel mesh, and if the aluminum frame steel mesh is damaged, you can only make a new one. In this way, not only is the large number of steel meshes inconvenient to manage, but it also leads to an increase in corresponding costs.

[0006] The above scheme, therefore we need to propose a combined structure solder paste steel mesh, which is installed on the solder paste printing mechanism to realize the solder paste printing process and solve the defects of the whole material precision-carved steel mesh and the aluminum frame steel mesh. Summary of the invention

[0007] The purpose of the present invention is to provide a combined structure solder paste steel mesh, which has a simple structure, is easy to install, has low maintenance cost, and is easy to switch when adapting to different products; the laser steel mesh prepared by laser cutting technology has extremely high opening accuracy and consistency, meeting the needs of high-density, high-precision SMT production lines; through the design of the combined structure, the solder paste steel mesh can be customized according to different PCB board designs to adapt to different pin spacings and layouts; through the cooperation of demolding spring pins and quick clamping hooks, the installation and disassembly of the steel mesh are more convenient, further improving production efficiency; through the design of the frame positioning pin sealing ring and the demolding spring pin sealing ring, good sealing performance is provided to prevent leakage and contamination of solder paste, so as to solve the problems raised in the above background technology.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a composite structure solder paste steel mesh, comprising a laser steel mesh frame, a laser steel mesh pressing plate located above the laser steel mesh frame, and a laser steel mesh pressed between the laser steel mesh frame and the laser steel mesh pressing plate by bolts;

[0009] The laser steel mesh frame is provided with a plurality of demoulding spring pins for assisting demoulding and limiting the position of the laser steel mesh, and the laser steel mesh frame is also provided with a demoulding spring pin sealing ring which is sleeved on the periphery of the demoulding spring pins and prevents solder paste leakage;

[0010] The laser steel mesh frame is also equipped with a frame positioning pin sealing ring for preventing solder paste from leaking between the laser steel mesh and the PCB board.

[0011] Preferably, a threaded blind hole is provided on the laser steel mesh frame, a through hole is provided on the laser steel mesh, a second countersunk hole is provided on the laser steel mesh pressing plate, and one end of the bolt passes through the second countersunk hole and the through hole and is threadedly connected to the inside of the threaded blind hole.

[0012] Preferably, a first countersunk hole is formed on the laser steel mesh frame, and the demoulding spring pin is installed inside the first countersunk hole.

[0013] Preferably, two laser steel meshes are stacked, and the two laser steel meshes are provided with demoulding spring pin limiting holes aligned with the first countersunk hole, and the top of the demoulding spring pin passes through the first countersunk hole and the demoulding spring pin limiting hole.

[0014] Preferably, two countersunk grooves are provided on the laser steel mesh frame near the first countersunk hole, and the frame positioning needle sealing ring is installed inside the countersunk grooves.

[0015] Preferably, the laser steel mesh is provided with two clearance holes for avoiding the positioning pin and preventing the positioning pin from contacting the laser steel mesh, and the clearance holes are aligned with the countersunk groove.

[0016] Preferably, two quick clamping hooks are symmetrically installed at both ends of the laser steel mesh frame for realizing quick replacement of the quick clamp on the printing mechanism and the laser steel mesh frame.

[0017] Preferably, the demoulding spring needle comprises a needle seat, and an elastic floating needle is movably provided on the top of the needle seat.

[0018] Preferably, the top end of the elastic floating needle passes through the demoulding spring needle sealing ring and the demoulding spring needle limiting hole.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention has a simple structure, is easy to install, has low maintenance cost, and is easy to switch when adapting to different products;

[0021] 2. The laser steel mesh prepared by the laser cutting technology of the present invention has extremely high opening accuracy and consistency, meeting the requirements of high-density and high-precision SMT production lines;

[0022] 3. Through the design of the combined structure, the solder paste steel mesh can be customized according to different PCB board designs to adapt to different pin spacings and layouts;

[0023] 4. The present invention makes the installation and disassembly of the steel mesh more convenient through the cooperation of the demoulding spring pin and the quick clamping hook, thereby further improving the production efficiency;

[0024] 5. The present invention provides good sealing performance and prevents leakage and contamination of solder paste through the design of the frame positioning pin sealing ring and the demoulding spring pin sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a front structural schematic diagram of the present invention;

[0026] Figure 2 It is a schematic diagram of the back structure of the present invention;

[0027] Figure 3 An exploded view of the present invention;

[0028] Figure 4 It is a schematic structural diagram of the demoulding spring pin and the demoulding spring pin sealing ring of the present invention.

[0029] In the figure: 1. Laser steel mesh frame; 11. Threaded blind hole; 12. First countersunk hole; 13. Countersunk groove; 2. Laser steel mesh pressing plate; 21. Second countersunk hole; 3. Laser steel mesh; 31. Through hole; 32. Demolding spring pin limit hole; 33. Give way hole; 4. Quick clamping hook; 5. Demolding spring pin; 51. Needle seat; 52. Elastic floating pin; 6. Frame positioning pin sealing ring; 7. Demolding spring pin sealing ring. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-4The present invention provides a technical solution: a composite structure solder paste steel mesh, comprising a laser steel mesh frame 1, a laser steel mesh pressing plate 2 located above the laser steel mesh frame 1, and a laser steel mesh 3 pressed between the laser steel mesh frame 1 and the laser steel mesh pressing plate 2 by bolts;

[0032] Laser Steel Mesh 3 is made by high-precision laser cutting technology, with extremely high opening accuracy and consistency, which can meet the needs of high-density and high-precision SMT (surface mount technology) production lines.

[0033] The combined structure of the solder paste steel mesh allows the solder paste steel mesh to be customized according to different PCB board designs to adapt to different pin spacings and component layouts. Each component can be easily disassembled and replaced, which is convenient for maintenance and upgrading.

[0034] The laser steel mesh 3 is made of high-strength cold-rolled steel plate or stainless steel plate, has high hardness and wear resistance, and is not easy to deform or damage.

[0035] The laser steel mesh frame 1 is provided with a plurality of demoulding spring pins 5 for assisting demoulding and limiting the position of the laser steel mesh 3. The laser steel mesh frame 1 is also provided with a demoulding spring pin sealing ring 7 which is sleeved on the periphery of the demoulding spring pins 5 and prevents solder paste leakage.

[0036] The demoulding spring pin 5 has a certain elasticity and restoring force. After the solder paste printing is completed, the demoulding spring pin can assist the steel mesh to be smoothly separated from the PCB board to ensure the integrity and accuracy of the solder paste pattern. In this process, the demoulding spring pin plays a role of buffering and supporting, avoiding potential damage to the PCB board and components caused by hard demoulding.

[0037] The design of the demoulding spring pin 5 simplifies the process of disassembling and replacing the steel mesh, thereby improving production efficiency. In the SMT production line, time is money, and any design that can shorten the production cycle is welcome. The design of the demoulding spring pin makes the installation and removal of the steel mesh more convenient, reduces the waiting time in the production process, and improves the overall production efficiency. By adjusting the position and number of the demoulding spring pin 5, it can adapt to PCB boards with different pin spacing and component layouts, thereby meeting diverse production needs.

[0038] The laser steel mesh frame 1 is also equipped with a frame positioning pin sealing ring 6 for preventing solder paste from leaking between the laser steel mesh 3 and the PCB board.

[0039] The design of the frame positioning pin seal 6 and the demoulding spring pin seal 7 enables the steel mesh to fit the PCB closely, ensuring that the solder paste can be accurately transferred to the corresponding position. The demoulding spring pin 5 helps to smoothly demould after the solder paste is printed, avoiding damage to the PCB and components.

[0040] The frame positioning pin seal 6 plays a key positioning role in the solder paste steel mesh. It ensures that the steel mesh can be accurately aligned with the target position on the PCB board, thereby achieving accurate printing of solder paste, helping to reduce errors in the printing process and improve product quality and reliability. It can also effectively prevent solder paste or other liquids from leaking out of the gap between the steel mesh and the PCB board.

[0041] Helps keep the printing area clean and dry, avoiding adverse effects on printing quality and subsequent processes.

[0042] The frame positioning pin seal ring 6 provides a stable support for the solder paste steel mesh, so that it can remain stable and firm during the printing process, which helps to reduce printing errors caused by vibration or displacement and improve the accuracy and consistency of printing.

[0043] The demoulding spring pin seal 7 assists demoulding after solder paste printing is completed. It can provide a certain elasticity and restoring force, so that the steel mesh can be smoothly separated from the PCB board, which helps to avoid damage to the PCB board and components during the demoulding process, while ensuring the integrity and accuracy of the solder paste pattern, reducing the downtime caused by demoulding difficulties, allowing the production line to run more efficiently, helping to reduce production costs and improve overall production efficiency.

[0044] The laser steel mesh frame 1 is provided with a threaded blind hole 11, the laser steel mesh 3 is provided with a through hole 31, and the laser steel mesh pressing plate 2 is provided with a second countersunk hole 21. One end of the bolt passes through the second countersunk hole 21 and the through hole 31 and is threadedly connected to the inside of the threaded blind hole 11.

[0045] When assembling the device, place the laser steel mesh 3 on the laser steel mesh frame 1, align the threaded blind hole 11 with the through hole 31, press the laser steel mesh pressing plate 2 onto the laser steel mesh 3, align the second countersunk hole 21 with the through hole 31, and then position the three with bolts.

[0046] The laser steel mesh frame 1 is provided with a first countersunk hole 12, and the demoulding spring pins 5 are installed inside the first countersunk hole 12. Eight demoulding spring pins 5 are arranged in a matrix.

[0047] The laser steel meshes 3 are stacked in two configurations. The two laser steel meshes 3 are provided with demoulding spring pin limiting holes 32 aligned with the first countersunk holes 12 . The tops of the demoulding spring pins 5 pass through the first countersunk holes 12 and the demoulding spring pin limiting holes 32 .

[0048] Optionally, eight demoulding spring pin limiting holes 32 are arranged in a matrix.

[0049] Two countersunk grooves 13 are formed on the laser steel mesh frame 1 near the first countersunk hole 12 , and the frame positioning needle sealing ring 6 is installed inside the countersunk groove 13 .

[0050] The laser steel mesh 3 is provided with two clearance holes 33 for avoiding the positioning pins and preventing the positioning pins from contacting the laser steel mesh 3 . The clearance holes 33 are aligned with the countersunk grooves 13 .

[0051] Two quick clamping hooks 4 for realizing quick replacement of the quick clamp on the printing mechanism and the laser steel mesh frame 1 are symmetrically installed at both ends of the laser steel mesh frame 1. The design of the quick clamping hooks 4 further improves the production efficiency.

[0052] The demoulding spring needle 5 comprises a needle seat 51, and a spring floating needle 52 is movably arranged at the top of the needle seat 51. The demoulding process of the laser steel mesh 3 is realized by the up and down movable arrangement of the spring floating needle 52.

[0053] The top end of the elastic floating needle 52 passes through the demoulding spring needle sealing ring 7 and the demoulding spring needle limiting hole 32 .

[0054] When using, select the laser steel mesh 3 that accurately corresponds to the pad on the PCB board, and clean the laser steel mesh 3 to ensure that there are no impurities and pollutants on its surface (the composition, viscosity, and metal content of the solder paste will affect the printing effect and subsequent welding quality), and then select the appropriate solder paste;

[0055] Then place the laser steel mesh 3 on the workbench, align it with the conveyor belt of the printer, and place and position the PCB board on the printer to avoid displacement during printing. Then evenly apply the solder paste on the upper surface of the laser steel mesh 3 to ensure that the solder paste fills all the openings of the laser steel mesh 3. Among them, the frame positioning pin sealing ring 6 and the demoulding spring pin sealing ring 7 can effectively prevent the leakage of solder paste, and the solder paste on the laser steel mesh 3 is printed on the pad of the PCB board through the scraper or roller of the printer. After printing, demoulding is performed through the demoulding spring pin 5. The demoulding spring pin 5 provides a certain elasticity and restoring force to make the laser steel mesh 3 detach from the PCB board.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A composite structure solder paste steel mesh, characterized by: It comprises a laser steel mesh frame (1), a laser steel mesh pressing plate (2) located above the laser steel mesh frame (1), and a laser steel mesh (3) compressed between the laser steel mesh frame (1) and the laser steel mesh pressing plate (2) by bolts; The laser steel mesh frame (1) is provided with a plurality of demoulding spring pins (5) for assisting demoulding and limiting the position of the laser steel mesh (3); the laser steel mesh frame (1) is also provided with demoulding spring pin sealing rings (7) which are sleeved on the periphery of the demoulding spring pins (5) and prevent solder paste leakage; The laser steel mesh frame (1) is also provided with a frame positioning pin sealing ring (6) for preventing solder paste from leaking between the laser steel mesh (3) and the PCB board; The laser steel mesh frame (1) is provided with a threaded blind hole (11), the laser steel mesh (3) is provided with a through hole (31), the laser steel mesh pressing plate (2) is provided with a second countersunk hole (21), and one end of the bolt passes through the second countersunk hole (21) and the through hole (31) and is threadedly connected to the inside of the threaded blind hole (11).

2. The combined structure solder paste steel mesh according to claim 1, characterized in that: The laser steel mesh frame (1) is provided with a first countersunk hole (12), and the demoulding spring pin (5) is installed inside the first countersunk hole (12).

3. The combined structure solder paste steel mesh according to claim 2, characterized in that: Two laser steel meshes (3) are stacked and provided, and the two laser steel meshes (3) are provided with demoulding spring pin limiting holes (32) aligned with the first countersunk hole (12), and the top of the demoulding spring pin (5) passes through the first countersunk hole (12) and the demoulding spring pin limiting hole (32).

4. The combined structure solder paste steel mesh according to claim 3, characterized in that: Two countersunk grooves (13) are provided on the laser steel mesh frame (1) at positions close to the first countersunk holes (12), and the frame positioning needle sealing ring (6) is installed inside the countersunk grooves (13).

5. The combined structure solder paste steel mesh according to claim 4, characterized in that: The laser steel mesh (3) is provided with two clearance holes (33) for avoiding the positioning needle and preventing the positioning needle from contacting the laser steel mesh (3), and the clearance holes (33) are aligned with the countersunk groove (13).

6. The composite structure solder paste steel mesh according to claim 1, characterized in that: Two quick clamping hooks (4) for realizing quick replacement of the quick clamp on the printing mechanism and the laser steel mesh frame (1) are symmetrically mounted at both ends of the laser steel mesh frame (1).

7. The combined structure solder paste steel mesh according to claim 1, characterized in that: The demoulding spring needle (5) comprises a needle seat (51), and a spring-loaded floating needle (52) is movably provided at the top end of the needle seat (51).

8. The combined structure solder paste steel mesh according to claim 7, characterized in that: The top end of the elastic floating needle (52) passes through the demoulding spring needle sealing ring (7) and the demoulding spring needle limiting hole (32).

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