Vacuum base jig for improving chip mounting precision

Abstract

The utility model discloses a vacuum base jig for improving chip mounting precision, which comprises a vacuum jig assembly and a chip mounting tray main body, the vacuum jig assembly is of a plate body structure, vacuum suction holes are distributed on the upper surface of the plate body, conduction grooves corresponding to the vacuum suction holes are arranged in the plate body, and the vacuum suction holes are communicated with the conduction grooves. A vacuum input hole used for being in butt joint with a vacuum source is formed in the bottom of the plate body, the vacuum input hole is communicated with an air guide groove formed in the plate body, the air guide groove is communicated with all the conduction grooves, and the vacuum input hole is matched with the air guide groove, the conduction grooves and the vacuum suction holes to stably suck the bottom of the patch tray body. According to the utility model, the problem that the final chip mounting precision is affected due to vibration caused by rigid mechanical clamping of a jig for an ultrahigh-precision chip mounting process in the prior art is solved.

Description

Technical Field

[0001] This utility model relates to the field of component mounting technology, and in particular to a vacuum base fixture for improving the mounting accuracy. Background Technology

[0002] With the continued miniaturization of electronic products, surface mount technology (SMT) is facing a severe challenge in mounting ultra-fine pitch components. For example, the solder ball pitch of current advanced flip-chip devices has been reduced to only 90 micrometers (µm), and the diameter of a single solder ball is even only 50µm, which is significantly smaller than the average diameter of an adult hair (about 60µm). At this scale, the ±50µm positioning accuracy of traditional SMT placement machines can no longer meet the mounting requirements of such ultra-precision components.

[0003] To meet the demands for ultra-high precision surface mount technology (SMT) placement, the industry requires placement accuracy to be improved to the ±10µm level. However, in the pursuit of higher precision, the traditional method of fixing the PCB tray using mechanical clamps has become particularly problematic. Vibrations during equipment operation are easily transmitted through the rigid clamping structure, subtly affecting the absolute positioning of the placement head and becoming a bottleneck restricting further improvements in overall accuracy. Therefore, innovative research into tray fixing solutions and the development of alternatives with higher stability and effective vibration isolation has become an urgent need in current technological development.

[0004] In view of this, this technical solution proposes a vacuum base fixture for improving the placement accuracy. It adopts a vacuum base structure that can vacuum-adsorb the placement tray, avoiding vibration and rigid contact caused by the pure mechanical clamping method of the tray, and ultimately improving the placement accuracy. Utility Model Content

[0005] The present invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the main objective of this invention is to provide a vacuum base fixture for improving the precision of chip placement, addressing the problem that vibrations caused by rigid mechanical clamping in existing ultra-high precision chip placement processes affect the final placement accuracy.

[0006] To achieve the above objectives, this utility model provides a vacuum base fixture for improving patch placement accuracy, comprising a vacuum fixture assembly and a patch tray body.

[0007] The vacuum fixture assembly has a plate-like structure. Vacuum suction holes are distributed on the upper surface of the plate. A guide groove corresponding to each vacuum suction hole is formed inside the plate. A vacuum input hole for connecting to a vacuum source is formed at the bottom of the plate. The vacuum input hole communicates with a gas guide groove formed inside the plate, and the gas guide groove communicates with each of the guide grooves.

[0008] The vacuum input hole, together with the air guide groove, the through groove and the vacuum suction hole, securely adsorbs the bottom of the patch tray body.

[0009] As a further embodiment of this utility model, the vacuum fixture assembly is an integral rectangular hollow metal plate with perforated structure.

[0010] As a further embodiment of this invention, each of the vacuum input holes is distributed in a manner corresponding to the contours of each side of the patch tray and the central patch carrier plate.

[0011] As a further embodiment of this utility model, the vacuum suction hole is in the shape of a concentric circle on the upper surface of the plate, and a sealing ring for increasing airtightness is provided between the two concentric circles.

[0012] As a further embodiment of this utility model, the air guide groove is radially connected to each of the guide grooves, and each of the guide grooves is connected to at least 4 of the vacuum suction holes.

[0013] As a further improvement of this invention, the vacuum input port is connected to a quick-change interface equipped with a vacuum sensor and a manual pressure relief valve.

[0014] The beneficial effects of this utility model are as follows:

[0015] This solution achieves flexible fixation through an innovative design of the vacuum fixture components. The integrated rectangular hollow metal plate structure incorporates radial air guide channels and through channels to form a highly efficient airflow network. The vacuum source quickly establishes a negative pressure environment through the vacuum input port, and the air is distributed to each through channel via the air guide channels. This, combined with at least four vacuum suction holes, forms an adsorption grid. These suction holes are precisely distributed according to the outline of the patch tray and the central patch carrier plate. Combined with a concentric double-ring suction hole structure and sealing rings, this ensures adsorption without dead angles, guaranteeing uniform force across the entire bottom of the tray. Simultaneously, a vacuum sensor integrated into the quick-change interface monitors the adsorption status in real time, and a manual pressure relief valve enables tray replacement within seconds. Ultimately, by eliminating mechanical vibration transmission, suppressing micro-deformation of the tray, and improving assembly / disassembly efficiency, the patch placement accuracy is stably improved to the ±10 micrometer level, and the time for a single replacement is significantly reduced. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of this utility model 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 technical solutions of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a planar schematic diagram of each vacuum suction hole disposed on the vacuum fixture assembly in this utility model.

[0018] Figure 2 This is a schematic diagram showing the vacuum input hole at the bottom of the vacuum fixture assembly in this utility model.

[0019] Figure 3 This is a schematic diagram of the air guide groove and the connecting groove in the perspective view of this utility model.

[0020] Figure 4 This is a schematic diagram of the patch tray body in this utility model being adsorbed onto the vacuum fixture assembly.

[0021] Figure 5 This is a schematic diagram of another configuration of the vacuum fixture assembly and external patch device in this utility model.

[0022] Figure 6 This is a schematic diagram of another form in which the patch tray body of this utility model is adsorbed onto the vacuum fixture assembly.

[0023] label name label name 1 Vacuum fixture components 12 Conductor slot 10 Vacuum input port 13 Vacuum suction hole 11 Air guide groove 2 Patch tray body Detailed Implementation

[0024] as follows:

[0025] Please see the appendix Figure 1-6 ,

[0026] The main structure includes a vacuum fixture assembly (1) and a patch tray body (2). The vacuum fixture assembly (1) has a plate structure. Vacuum suction holes (13) are distributed on the upper surface of the plate. A guide groove (12) corresponding to each vacuum suction hole (13) is opened inside the plate. A vacuum input hole (10) for docking with a vacuum source is opened at the bottom of the plate. The vacuum input hole (10) is connected to the air guide groove (11) opened inside the plate. The air guide groove (11) is connected to each guide groove (12). The cooperation of the vacuum input hole (10) with the air guide groove (11), the guide groove (12) and the vacuum suction hole (13) firmly adsorbs the bottom of the patch tray body (2).

[0027] The working principle is as follows:

[0028] This technical solution solves the core problem in the existing ultra-high precision chip placement process where vibration transmission caused by the rigid mechanical clamping of the fixture affects the placement accuracy. Traditional clamping methods will directly transmit minute vibrations to the chip tray body (2) during equipment operation, interfering with the precise positioning of the chip head. Especially when dealing with ultra-precision components with a solder ball pitch of only 90 micrometers and a solder ball diameter of 50 micrometers, the traditional accuracy of ±50 micrometers can no longer meet the requirements.

[0029] This technical solution uses a vacuum fixture assembly (1) as an integrated rectangular hollow metal plate. Its bottom vacuum input hole (10) is connected to an external vacuum source. The negative pressure gas is quickly transmitted to each guide groove (12) through the radially distributed air guide groove (11) inside the plate. Finally, it acts uniformly on the vacuum suction hole (13) group distributed on the upper surface of the plate according to the outline of the patch tray body (2) and the corresponding central carrier plate, forming a fully covered adsorption force field.

[0030] Furthermore, in this process, the vacuum suction holes (13) are arranged in concentric circles and are used in conjunction with sealing rings to ensure the airtightness of the adsorption interface. Each guide groove (12) is linked to at least 4 vacuum suction holes (13) to enhance adsorption stability. The vacuum sensor and manual pressure relief valve integrated into the quick-change interface realize real-time monitoring and rapid release of negative pressure. As a result, the patch tray body (2) is flexibly adsorbed and fixed on the surface of the vacuum fixture assembly (1), completely isolating the rigid vibration transmission caused by mechanical clamping. At the same time, the uniform negative pressure of the plate structure effectively suppresses the micro-deformation of the tray plane, ultimately improving the patch accuracy to the ±10 micrometer level and greatly simplifying the tray clamping operation process.

[0031] Reference Appendix Figure 1 , 2 A preferred embodiment of this utility model: the vacuum fixture assembly (1) is an integral rectangular hollow metal plate with perforation structure.

[0032] In this technical solution, the integrally formed metal plate structure, through the internal interconnected air passage design, allows the vacuum negative pressure to uniformly cover the entire adsorption surface, making the four corners of the patch tray body (2) less prone to warping and ensuring balanced adsorption force. The rigid metal material can stably bear the vibration of equipment operation and isolate the resonance interference of external mechanical clamping, achieving ±10 micrometer-level stable positioning required for ultra-precision patching under dual protection.

[0033] Reference Appendix Figure 1 , 5 6. A preferred embodiment of this utility model: each vacuum input hole (10) is distributed in a manner corresponding to the contour of each side of the patch tray body (2) and the patch carrier plate in the middle.

[0034] The targeted distribution of this technical solution enables the vacuum suction to precisely cover the most easily deformable edges and central areas of the patch tray body (2), forming an anti-warping adsorption defense line at the four-sided contour. At the same time, a support skeleton is established in the core area of ​​the patch carrier plate to ensure that the entire tray is evenly attached to the surface of the fixture under negative pressure, eliminating the risk of local deformation.

[0035] Reference Appendix Figure 1 In a preferred embodiment of this utility model, the vacuum suction hole (13) is in the shape of a concentric circle on the upper surface of the plate, and a sealing ring for increasing airtightness is provided between the two concentric circle structures.

[0036] Specifically, the concentric vacuum suction holes (13) combined with the double-ring sealing ring design can form a multi-layer adsorption force field. That is, the inner ring suction holes stabilize the central area of ​​the patch carrier, the outer ring suction holes lock the edge of the tray, and the sealing ring blocks the leakage channel, so that the negative pressure evenly covers the entire contact surface.

[0037] Reference Appendix Figure 3 In a preferred embodiment of this utility model, the air guide groove (11) is radially connected to each guide groove (12), and each guide groove (12) is connected to at least 4 vacuum suction holes (13).

[0038] Specifically, the radial air guide groove (11) allows the vacuum negative pressure to be quickly diverted from the central input hole to each edge guide groove (12), and each guide groove (12) is linked with more than 4 suction holes to form a multi-point adsorption grid, which ensures the negative pressure transmission efficiency, avoids the risk of single-point failure, and ensures that the adsorption force in any area of ​​the tray is uniform and stable.

[0039] Reference Appendix Figure 2 In a preferred embodiment of this utility model, the vacuum input port (10) is connected to a quick-change interface with a vacuum sensor and a manual pressure relief valve.

[0040] This technical solution can use a quick-change interface to integrate a vacuum sensor to monitor the adsorption status in real time. It will immediately issue an alert if there is any abnormality. The manual pressure relief valve can actively release the negative pressure to facilitate quick tray replacement. This combination ensures that the adsorption process is stable and controllable, while shortening the time required for traditional mechanical unlocking, thus achieving efficient and precise continuous operation.

[0041] The above are merely preferred embodiments of the present utility model and do not limit the patent scope of the present utility model. Any equivalent structural transformations made using the contents of the present utility model specification and drawings under the concept of the present utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A vacuum base fixture for improving patch mounting accuracy, characterized in that, include Vacuum fixture components and patch tray body, The vacuum fixture assembly has a plate-like structure. Vacuum suction holes are distributed on the upper surface of the plate. A guide groove corresponding to each vacuum suction hole is formed inside the plate. A vacuum input hole for connecting to a vacuum source is formed at the bottom of the plate. The vacuum input hole communicates with a gas guide groove formed inside the plate, and the gas guide groove communicates with each of the guide grooves. The vacuum input hole, together with the air guide groove, the through groove and the vacuum suction hole, securely adsorbs the bottom of the patch tray body.

2. The vacuum base fixture for improving patch placement accuracy according to claim 1, characterized in that, The vacuum fixture is a one-piece rectangular hollow metal plate with perforated structure.

3. The vacuum base fixture for improving patch placement accuracy according to claim 1, characterized in that, Each of the vacuum input holes is distributed in a manner corresponding to the contours of each side of the patch tray and the central patch carrier plate.

4. The vacuum base fixture for improving patch placement accuracy according to claim 1, characterized in that, The vacuum suction holes are arranged in a concentric circle structure on the upper surface of the plate, and a sealing ring is provided between the two concentric circles to increase airtightness.

5. The vacuum base fixture for improving patch placement accuracy according to claim 1, characterized in that, The air guide grooves are radially connected to each of the guide grooves, and each of the guide grooves is connected to at least four of the vacuum suction holes.

6. The vacuum base fixture for improving patch placement accuracy according to claim 1, characterized in that, The vacuum input port is connected to a quick-change interface equipped with a vacuum sensor and a manual pressure relief valve.

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