Universal silk-screen printing clamp for SIP assembly

Abstract

The invention provides a universal silk-screen printing clamp for SIP assemblies, and relates to the technical field of tool clamps. According to the silk-screen printing clamp, elastic clamping force can be provided for the SIP assembly placed in the rectangular positioning groove through the clamping assembly, so that the SIP assemblies of various specifications and sizes can be stably clamped in batches, the consistency and printing quality of soldering paste and a bonding pad are remarkably improved, the repair probability caused by unqualified solder ball position deviation is reduced, the silk-screen printing efficiency is high, and the production cost is reduced. And the ball mounting reliability after silk-screen printing is high.

Description

Technical Field

[0001] This invention relates to the field of tooling and fixture technology, and specifically to a universal screen printing fixture for SIP components. Background Technology

[0002] With the development of radar and wireless communication technologies, modern electronic systems place higher demands on the performance of microwave components. Radar systems need to achieve high-precision detection and complex signal processing. Traditional discrete microwave components, due to their large size, complex interconnections, and high losses, are difficult to meet the requirements of high-density integration, and new solutions are urgently needed. System-in-Package (SIP) technology significantly improves integration and performance by integrating modules such as RF chips, filters, and antennas. Its co-packaging and 3D stacking processes shorten signal paths, reduce parasitic effects, support multi-band and multi-mode signal processing, and are widely used in scenarios such as millimeter-wave radar and 5G base stations.

[0003] In the manufacturing process of SIP components, their structural complexity, high integration of tiny components, and stringent precision requirements pose significant challenges to the design of tooling fixtures. Traditional fixtures struggle to adapt to the diverse sizes of SIP components, resulting in insufficient clamping stability. This is particularly problematic in the screen printing stage, where insufficient clamping force can easily cause solder ball misalignment (often exceeding 10μm), directly impacting printing quality and yield. Furthermore, separate fixture designs are required for different SIP component sizes, extending the development cycle (2-4 weeks for a single fixture) and significantly increasing manufacturing costs. Therefore, there is an urgent need for a screen printing fixture that is compatible with multiple SIP component sizes and possesses high clamping stability to address the shortcomings of existing technologies in terms of precision control, efficiency improvement, and cost optimization. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a universal screen printing fixture for SIP components, which solves the problems that existing screen printing fixtures for SIP components cannot adapt to various sizes of SIP components and have insufficient clamping stability.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A universal screen printing fixture for SIP components, the screen printing fixture comprising: a tooling base and a clamping assembly; The tooling base has several downwardly extending rectangular positioning grooves, sliding grooves and threaded holes on its surface. Each rectangular positioning groove is matched with two sliding grooves. The two matching sliding grooves are respectively opened at the two adjacent sides of the rectangular positioning groove. The extension direction of the sliding groove is perpendicular to the corresponding side. Each sliding groove is matched with a threaded hole, and the matching threaded hole is opened on one side of the sliding groove. The clamping assembly includes: a slider, a pressure bar, and a spring; The slider slides freely along the groove; the pressure bar has a mounting hole, and the screw passes through the mounting hole and is threaded into the threaded hole, so that the pressure bar is connected to the working base, and the pressure bar presses the slider into the groove; the spring is set between the end of the slider and the end of the groove, so that the slider provides elastic clamping force for the SIP assembly placed in the rectangular positioning groove under the action of the spring force.

[0006] Preferably, the depth of the groove is greater than the depth of the rectangular positioning groove.

[0007] Preferably, the groove extends from the corresponding side to both ends, and the groove partially overlaps with the rectangular positioning groove.

[0008] Preferably, a plurality of first stress grooves are provided at the corners of the rectangular positioning groove.

[0009] Preferably, the head end of the chute is provided with a plurality of second stress grooves.

[0010] Preferably, each slider is matched with no fewer than two springs.

[0011] Preferably, the threaded hole is configured as a countersunk hole, which is connected to the groove, and the pressure strip is installed in the countersunk hole, with the surface of the pressure strip being lower than the surface of the tooling base.

[0012] Preferably, a limiting groove is formed on the surface of the slider, and the pressure strip is accommodated in the limiting groove.

[0013] Preferably, the rectangular positioning groove has dimensions of 18mm x 18mm; the slider has a sliding stroke of 5mm.

[0014] Preferably, the tooling base is made of aluminum alloy and the slider is made of polytetrafluoroethylene.

[0015] This invention provides a universal screen printing fixture for SIP components. Compared with the prior art, it has the following advantages: In this invention, the screen printing fixture can provide elastic holding force to the SIP components placed in the rectangular positioning groove through the clamping component, enabling it to stably clamp SIP components of various specifications and sizes in batches, significantly improving the consistency of solder paste and pads and printing quality, reducing the probability of rework caused by unqualified solder ball position, and achieving high screen printing efficiency and high reliability of ball placement after screen printing. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, 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 the present invention. 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 structure of the screen printing fixture in an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the tooling base in an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the clamping assembly in an embodiment of the present invention.

[0020] The reference numerals in the figure are: tooling base 100, rectangular positioning groove 101, threaded hole 102, slide groove 103, clamping assembly 200, slider 201, pressure bar 202, and spring 203. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] This application provides a universal screen printing fixture for SIP components, which solves the problem that screen printing fixtures for SIP components cannot adapt to various sizes of SIP components and have insufficient clamping stability.

[0023] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0024] Example: like Figures 1-3 As shown, the present invention provides a universal screen printing fixture for SIP components, the screen printing fixture comprising: a tooling base 100 and a clamping assembly 200; The tooling base 100 has several downwardly extending rectangular positioning grooves 101, sliding grooves 103 and threaded holes 102 on its surface. Each rectangular positioning groove 101 is matched with two sliding grooves 103. The two matching sliding grooves 103 are respectively opened at the two adjacent edges of the rectangular positioning groove 101. The extension direction of the sliding groove 103 is perpendicular to the corresponding edge. Each sliding groove 103 is matched with a threaded hole 102. The matching threaded hole 102 is opened on one side of the sliding groove 103. The clamping assembly 200 includes: a slider 201, a pressure bar 202, and a spring 203; The slider 201 slides freely along the slide groove 103; the pressure bar 202 has a mounting hole, and the screw passes through the mounting hole and is threaded to the threaded hole 102, so that the pressure bar 202 is connected to the working base 100, and the pressure bar 202 presses the slider 201 into the slide groove 103; the spring 203 is disposed between the end of the slider 201 and the end of the slide groove 103, so that the slider 201 provides elastic clamping force for the SIP assembly placed in the rectangular positioning groove 101 under the action of the spring force of the spring 203.

[0025] like Figure 2 As shown, the groove depth of the slide 103 is greater than the groove depth of the rectangular positioning groove 101 to prevent the slider 201 from coming off the head end of the slide 103.

[0026] like Figures 1-3 As shown, the slide groove 103 extends from the corresponding side to both ends, that is, the slide groove 103 partially overlaps with the rectangular positioning groove 101, so that the slider 201 can enter the rectangular positioning groove 101 to stably clamp the small-sized SIP component.

[0027] like Figures 1-3 As shown, several first stress grooves are provided at the corners of the rectangular positioning groove 101 to prevent stress concentration between the SIP assembly and the rectangular positioning groove 101.

[0028] like Figures 1-3 As shown, the head end of the slide groove 103 is provided with several second stress grooves to prevent stress concentration between the slider 201 and the slide groove 103.

[0029] like Figure 1 , Figure 3 As shown, each slider 201 is matched with no fewer than two springs 203.

[0030] like Figures 1-3 As shown, the threaded hole 102 is configured as a countersunk hole, which is connected to the slide groove 103. The pressure strip 202 is installed in the countersunk hole, and the surface of the pressure strip 202 is lower than the surface of the tooling base 100.

[0031] like Figures 1-3 As shown, a limiting groove is formed on the surface of the slider 201, and the pressure strip 202 is accommodated in the limiting groove.

[0032] The rectangular positioning groove 101 has dimensions of 18mm x 18mm.

[0033] The sliding stroke of the slider 201 is 5mm.

[0034] The tooling base 100 is made of aluminum alloy, and the slider 201 is made of polytetrafluoroethylene.

[0035] In summary, compared with the prior art, the present invention has the following beneficial effects: In this embodiment of the invention, the screen printing fixture can provide elastic holding force to the SIP components placed in the rectangular positioning groove 101 through the clamping component 200, enabling it to stably clamp SIP components of various specifications and sizes in batches, significantly improving the consistency of solder paste and pads and printing quality, reducing the probability of rework caused by unqualified solder ball position offset, and achieving high screen printing efficiency and high reliability of ball placement after screen printing.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0037] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A universal screen printing fixture for SIP components, characterized in that, The screen printing fixture includes: a tooling base (100) and a clamping assembly (200). The tooling base (100) has several downwardly extending rectangular positioning grooves (101), sliding grooves (103) and threaded holes (102) on its surface. Each rectangular positioning groove (101) is matched with two sliding grooves (103). The two matching sliding grooves (103) are respectively opened at the two adjacent edges of the rectangular positioning groove (101). The extension direction of the sliding groove (103) is perpendicular to the corresponding edge. Each sliding groove (103) is matched with a threaded hole (102). The matching threaded hole (102) is opened on one side of the sliding groove (103). The clamping assembly (200) includes: a slider (201), a pressure bar (202), and a spring (203); The slider (201) slides freely along the groove (103); the pressure bar (202) has a mounting hole, and the screw is threaded to the threaded hole (102) after passing through the mounting hole, so that the pressure bar (202) is connected to the working base (100), and the pressure bar (202) presses the slider (201) into the groove (103); the spring (203) is set between the end of the slider (201) and the end of the groove (103), so that the slider (201) provides elastic clamping force for the SIP assembly placed in the rectangular positioning groove (101) under the action of the spring force of the spring (203).

2. The universal screen printing fixture for SIP components as described in claim 1, characterized in that, The groove depth of the slide (103) is greater than the groove depth of the rectangular positioning groove (101).

3. The universal screen printing fixture for SIP components as described in claim 1, characterized in that, The groove (103) extends from the corresponding side to both ends, and the groove (103) partially overlaps with the rectangular positioning groove (101).

4. The universal screen printing fixture for SIP components as described in claim 1, characterized in that, Several first stress grooves are provided at the corners of the rectangular positioning groove (101).

5. The universal screen printing fixture for SIP components as described in claim 1, characterized in that, The head end of the slide (103) is provided with several second stress grooves.

6. The universal screen printing fixture for SIP components as described in claim 1, characterized in that, Each slider (201) is matched with at least two springs (203).

7. The universal screen printing fixture for SIP components as described in claim 1, characterized in that, The threaded hole (102) is set as a countersunk hole, which is connected to the slide groove (103). The pressure strip (202) is installed in the countersunk hole, and the surface of the pressure strip (202) is lower than the surface of the tooling base (100).

8. The universal screen printing fixture for SIP components as described in claim 1, characterized in that, The slider (201) has a limiting groove on its surface, and the pressure strip (202) is accommodated in the limiting groove.

9. The universal screen printing fixture for SIP components as described in claim 1, characterized in that, The rectangular positioning groove (101) has a length and width of 18mm*18mm; the slider (201) has a sliding stroke of 5mm.

10. The universal screen printing fixture for SIP components as described in claim 1, characterized in that, The tooling base (100) is made of aluminum alloy, and the slider (201) is made of polytetrafluoroethylene.

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