A compensation clamp for SMT solder paste printing

Abstract

The utility model provides a kind of SMT solder paste printing's control amount supply compensation fixture, it has the ability of accurate regulation and control solder paste supply amount, and real-time compensation interference in printing process, significantly enhance the stability of printing process and product pass rate.It includes: fixture body, it includes outer frame, the face domain center of outer frame is hollow printing area, the hollow printing area is used to place several steel nets, adjacent steel net sequentially arranges along the long side of hollow printing area, and there is steel net middle interval position;Precise screw mechanism;Several high-precision pressure sensors;Several detachable cross beams;And two groups of pedestals;The lower of a pair of short sides of the outer frame of the fixture body is respectively provided with pedestal, the upper position of the pedestal of corresponding position is connected by precise screw mechanism at the four corner positions of the outer frame, the outer periphery or bottom of the outer frame is arranged with several high-precision pressure sensors, and the detachable cross beam is inserted at the steel net middle interval position of the fixture body.

Description

Technical Field

[0001] This utility model relates to the technical field of semiconductor packaging, specifically to a quantity control and compensation fixture for SMT solder paste printing. Background Technology

[0002] Surface Mount Technology (SMT) has become the cornerstone of modern electronics manufacturing, with its core objective being the high-speed, high-precision mounting of microelectronic components onto printed circuit boards (PCBs). In this complex process chain, solder paste printing plays a crucial "quality gatekeeper" role. Solder paste—a viscous mixture of fine metal alloy powder and flux carrier—is extruded through a precisely etched stencil by a squeegee into its openings, and then deposited onto the corresponding pads on the PCB during the demolding stage. Theoretically, the solder paste printing process requires precise and consistent solder paste volume filling each opening to ensure reliable solder joints after reflow soldering. However, real-world production environments are far from ideal; the instability and uncontrollability of solder paste supply have long plagued SMT production lines, hindering yield improvements and impacting the efficiency of high-end product development. Utility Model Content

[0003] To address the aforementioned issues, this invention provides a controllable supply compensation fixture for SMT solder paste printing. This fixture has the ability to precisely control the solder paste supply and compensate for interference during the printing process in real time, significantly enhancing the stability of the printing process and the product qualification rate.

[0004] A quantity control and compensation fixture for SMT solder paste printing, characterized in that it comprises: The fixture body includes an outer frame, the center of which is a cutout printing area. The cutout printing area is used to place several steel meshes. Adjacent steel meshes are arranged sequentially along the long side of the cutout printing area, forming a space between the steel meshes. Precision screw mechanism; Several high-precision pressure sensors; Several detachable crossbeams; And two sets of bases; The clamp body has a base located below a pair of short sides of its outer frame. The four corners of the outer frame are connected to the upper part of the corresponding base via a precision screw mechanism. Several high-precision pressure sensors are arranged around the outer perimeter or bottom of the outer frame. Detachable crossbeams are inserted at intervals in the middle of the steel mesh of the clamp body.

[0005] Its further features are: The outer frame has several mounting notches arranged along its long side. The detachable crossbeam is inserted into the mounting notch on one long side and positioned within the mounting notch on the other long side. The position of the detachable crossbeam is arranged according to the required spacing of the steel mesh. The base is provided with a concave threaded hole at the position corresponding to the precision screw mechanism. The precision screw mechanism includes a servo motor, and all the servo motors are externally connected to the central processing unit of the printing system. The adjustment accuracy of the precision screw mechanism is ±0.01mm; Each base has mounting holes on both sides that correspond to the alignment holes of the printing equipment. The base and the printing equipment can be quickly installed by fastening with screws. A positioning hole is provided on the outer edge of one of the short sides of the outer frame of the fixture body. The positioning hole is aligned with the positioning post of the printing equipment, so that the entire fixture body can be quickly and accurately aligned.

[0006] By adopting the above technical solution, the detachable crossbeams precisely support the intermediate intervals of the stencil, effectively suppressing stencil deformation during the printing process, reducing the volume fluctuation rate of solder balls, and significantly improving the stability of printing quality. Furthermore, the coordinated operation of the high-precision pressure sensor and the precision screw mechanism achieves displacement control accuracy and pressure stability of ±0.01mm, greatly improving the consistency of printing quality. It also has the ability to precisely control the solder paste supply and compensate for interference during the printing process in real time, significantly enhancing the stability of the printing process and the product qualification rate. Attached Figure Description

[0007] Figure 1 This is the front view of the present invention; Figure 2 This is a top view of the present invention (without steel mesh). Figure 3 This is a top view of the present invention (with steel mesh installed). Figure 4 This is a schematic diagram of the assembly of the detachable crossbeam of this utility model; The names corresponding to the serial numbers in the diagram are as follows: 1. High-precision pressure sensor; 2. Fixture body; 3. Hole printing area; 4. Precision screw mechanism; 5. Base; 6. Mounting hole; 7. Detachable crossbeam; 8. Steel mesh middle interval position; 9. Positioning hole; 10. Steel mesh; 11. Mounting notch. Detailed Implementation

[0008] A quantity control and compensation fixture for SMT solder paste printing, see Figures 1-4 It includes a clamp body 2, a precision screw mechanism 4, several high-precision pressure sensors 1, several detachable crossbeams 7, and two sets of bases 5; The fixture body 1 includes an outer frame, the center of the outer frame is a cutout printing area 3, the cutout printing area 3 is used to place several steel meshes 10, and adjacent steel meshes 10 are arranged sequentially along the long side of the cutout printing area 3 to form a steel mesh middle interval position 8. The clamp body 2 has a base 5 below a pair of short sides of its outer frame. The four corners of the outer frame are connected to the upper part of the corresponding base 5 by a precision screw mechanism 4. Several high-precision pressure sensors 1 are arranged around the outer periphery or bottom of the outer frame. A detachable crossbeam 7 is inserted at the middle interval 8 of the steel mesh of the clamp body 2.

[0009] In specific implementation: Several installation notches 11 are arranged on the long side of the outer frame. The detachable crossbeam 7 is inserted into the installation notch 11 on one long side and positioned in the installation notch 11 on the other long side. The position of the detachable crossbeam 7 is arranged according to the requirements of the middle interval position 8 of the steel mesh. The base 5 is provided with an internal threaded hole at the position corresponding to the precision screw mechanism 4. The precision screw mechanism 4 includes a servo motor, and all the servo motors are externally connected to the central processing unit of the printing system. The adjustment accuracy of the precision screw mechanism 4 is ±0.01mm; Each base 5 has mounting holes 6 on both sides that correspond to the alignment holes of the printing equipment. The base and the printing equipment are quickly installed by screw fastening. A positioning hole 9 is provided on the outer edge of one of the short sides of the outer frame of the fixture body 2. The positioning hole 9 is aligned with the positioning post of the printing equipment, so that the entire fixture body can be quickly and accurately aligned.

[0010] The principle is as follows: The middle interval position 8 of the stencil can be adjusted according to different product requirements. At this time, the detachable crossbeam 7 at the corresponding position can be installed to provide effective support for the substrate, avoiding the problem of uneven solder paste caused by stencil deformation during printing. During installation, the detachable crossbeam 7 is first assembled into place, and then the fixture body is positioned as a whole on the printing equipment. By aligning the positioning hole 9 with the standard positioning post of the printing machine and tightening the 10 mounting holes 6 with screws, the base 5 and the printing equipment can be stably connected. During the operation of the printing press, when the squeegee passes the high-precision pressure sensor 1, the sensor can monitor the squeegee pressure change in real time and transmit the collected data to the central processing unit. Based on big data analysis of printing process parameters, the system automatically optimizes and adjusts relevant parameters, and achieves ultra-high precision displacement control of ±0.01mm through the precision screw mechanism 4. This closed-loop control system can ensure the accurate execution of dynamic compensation of solder paste supply, effectively improving the stability and consistency of printing quality.

[0011] The beneficial effects of this utility model are as follows: It uses a detachable crossbeam to precisely support the intermediate intervals of the stencil, effectively suppressing stencil deformation during printing, reducing solder ball volume fluctuation, and significantly improving printing quality stability; the coordinated work of a high-precision pressure sensor and a precision screw mechanism achieves displacement control accuracy and pressure stability of ±0.01mm, greatly improving the consistency of printing quality; the standardized design of positioning holes and mounting holes shortens line changeover time, and the use of big data analysis of process parameters reduces manual debugging time, significantly improving production efficiency while also greatly enhancing R&D efficiency; simultaneously, this fixture reduces solder paste consumption and extends stencil lifespan. Its modular design is compatible with full-size component printing, adapts to current mainstream printing equipment, and can be quickly deployed without modification, making it particularly suitable for SMT production lines with high precision requirements such as automotive electronics and smart wearable devices.

[0012] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0013] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A quantity control and compensation fixture for SMT solder paste printing, characterized in that, It includes: The fixture body includes an outer frame, the center of which is a cutout printing area. The cutout printing area is used to place several steel meshes. Adjacent steel meshes are arranged sequentially along the long side of the cutout printing area, forming a space between the steel meshes. Precision screw mechanism; Several high-precision pressure sensors; Several detachable crossbeams; And two sets of bases; The clamp body has a base located below a pair of short sides of its outer frame. The four corners of the outer frame are connected to the upper part of the corresponding base via a precision screw mechanism. Several high-precision pressure sensors are arranged around the outer perimeter or bottom of the outer frame. Detachable crossbeams are inserted at intervals in the middle of the steel mesh of the clamp body.

2. The quantity control and compensation fixture for SMT solder paste printing according to claim 1, characterized in that: The outer frame has several mounting notches arranged along its long side. The detachable crossbeam is inserted into the mounting notch on one long side and positioned within the mounting notch on the other long side. The position of the detachable crossbeam is arranged according to the required spacing of the steel mesh.

3. The quantity control and compensation fixture for SMT solder paste printing according to claim 1, characterized in that: The base is provided with a concave threaded hole at the position corresponding to the precision screw mechanism. The precision screw mechanism includes a servo motor, and all servo motors are externally connected to the central processing unit of the printing system.

4. The quantity control and compensation fixture for SMT solder paste printing according to claim 3, characterized in that: The adjustment accuracy of the precision screw mechanism is ±0.01mm.

5. The quantity control and compensation fixture for SMT solder paste printing according to claim 1, characterized in that: Each base has mounting holes on both sides that align with the alignment holes of the printing equipment. The base and the printing equipment can be quickly installed by fastening with screws.

6. The quantity control and compensation fixture for SMT solder paste printing according to claim 1, characterized in that: A positioning hole is provided on the outer edge of one of the short sides of the outer frame of the fixture body, and the positioning hole is aligned with the positioning post of the printing equipment.

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