A QFN package spliced type cavity insert structure

Abstract

This utility model discloses a QFN packaged spliced ​​mold socket insert structure, relating to the field of packaged spliced ​​mold socket inserts. It includes a structural body, with a mold socket insert mounted at the center of the top of the structural body. Sprue bars are symmetrically arranged at both ends of the mold socket insert, and mounting blocks are symmetrically mounted at both ends of the sides of the mold socket insert. An adapter groove is formed at the top of the mold socket insert, and a base is mounted at the bottom of the structural body. Movable grooves are symmetrically formed at both ends of the top of the structural body, and a fixing rod is installed in the inner cavity of the movable groove. A spring is wound around the outer wall of the fixing rod. This utility model's QFN packaged spliced ​​mold socket insert structure separates the QFN sprue bar and the mold socket insert, requiring only assembly at the structural body for subsequent installation. Compared to the older integrated type, this spliced ​​design allows for direct replacement of the sprue bar when its service life reaches its limit, and direct replacement of the damaged mold socket insert. This effectively improves production efficiency and reduces mold maintenance costs.

Description

Technical Field

[0001] This utility model relates to the field of encapsulated splicing mold socket inserts, and in particular to a QFN encapsulated splicing mold socket insert structure. Background Technology

[0002] As a high-end packaging form, the continuous development of chips in recent years has led to a significant increase in demand for QFN packaging. QFN packaging differs from traditional leaded packaging, which requires post-packaging processing such as lead trimming and molding. QFN packages have a larger molded surface area, requiring subsequent cutting and soldering. This large molded surface area also presents a significant challenge in processing and repair. Strict requirements are placed on the consistency and surface roughness of the molded surface, making processing more demanding. Furthermore, mold costs for repair are difficult to control.

[0003] QFN series packaged products have large molding dimensions, resulting in a similarly large EDM (Electrical Discharge) surface area. If the sprue and socket insert are machined as a single unit, both the sprue and socket require EDM. If the socket is damaged or the sprue reaches its lifespan limit, the entire component, including the socket insert and sprue, will be scrapped. EDM costs are inherently very high. Reaching the sprue's lifespan limit (typically ASP23 material with a hardness of HRC62-64 and a lifespan of approximately 150,000 cycles) or socket damage will render the component unusable or require downgrading. Regardless of the approach, the cost of EDM combined with the mold bed is extremely high.

[0004] Therefore, it is necessary to propose a QFN packaged splicing mold insert structure to solve the above problems. Utility Model Content

[0005] The main objective of this invention is to provide a QFN packaged splicing mold recess insert structure, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A QFN packaged splicing mold socket insert structure includes a structural body, a mold socket insert installed at the center of the top of the structural body, sprue strips symmetrically arranged at both ends of the mold socket insert, mounting blocks symmetrically installed at both ends of both sides of the mold socket insert, and an adapter groove opened at the top of the mold socket insert.

[0008] Preferably, a base is installed at the bottom of the structure body, and movable grooves are symmetrically opened at both ends of the top two sides of the structure body. A fixed rod is installed in the inner cavity of the movable groove, and a spring is wound around the outer wall of the fixed rod.

[0009] Preferably, one end of the spring is installed in the inner cavity of the movable groove, movable blocks are symmetrically installed on both sides of the sprue bar, the two sides of the movable blocks are movably connected in the inner cavity of the movable groove and sleeved on the outer wall of the fixed rod, and the other end of the spring is connected to the sprue bar.

[0010] Preferably, the top of the sprue bar has an injection port, and a retaining block is installed on the side of the sprue bar near the mold insert. A through groove is provided in the inner cavity of the retaining block, and the through groove communicates with the inner cavity of the injection port.

[0011] Preferably, the mold insert has symmetrical connecting grooves at the center of both ends, the injection port communicates with the inner cavity of the connecting groove through a through groove, and the connecting groove communicates with the inner cavity of the adapter groove.

[0012] Preferably, the mold insert has symmetrically provided positioning grooves at both ends on both sides, the mounting block has a positioning block installed on the side of the mounting block near the mold insert, the mounting block is threaded with a reinforcing bolt, the positioning block is inserted into the inner cavity of the mold insert through the positioning groove, and the mounting block is installed on the structural body by the reinforcing bolt.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The QFN encapsulated spliced ​​mold socket insert structure features a separate QFN gate strip and mold socket insert. Subsequent installation only requires assembling them at the main body of the structure. Compared with the old-fashioned integrated type, this spliced ​​type allows for direct replacement of the gate strip if its service life reaches its limit, and direct replacement of the damaged mold socket insert. Based on this, production efficiency can be effectively improved and mold maintenance costs can be reduced.

[0015] 2. This QFN-encapsulated splicing mold socket insert structure uses a detachable movable block to facilitate the replacement and installation of the sprue strip. With the help of a spring, the sprue strip can be retracted at any time under normal conditions. When connecting the mold socket insert and the sprue strip, the mold socket insert and the sprue strip can be automatically spliced ​​together, so that the locking block can be directly inserted into the inner cavity of the connecting groove, which facilitates the subsequent sprue work of the mold socket insert.

[0016] 3. The QFN packaged spliced ​​mold socket insert structure, through the setting of mounting blocks, positioning blocks and reinforcing bolts, can reinforce both sides of the mold socket insert. In conjunction with the sprue strips clamped at both ends of the mold socket insert, it can further improve the stability of the mold socket insert during operation and avoid the phenomenon of shaking during molding. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the main body of this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the gate bar of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the mold recess insert of this utility model.

[0021] In the diagram: 1. Main body; 2. Base; 3. Mold insert; 4. Adaptor groove; 5. Positioning groove; 6. Mounting block; 7. Positioning block; 8. Reinforcing bolt; 9. Sprue strip; 10. Injection port; 11. Locking block; 12. Through groove; 13. Translation groove; 14. Movable groove; 15. Fixing rod; 16. Spring; 17. Connecting groove. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0023] like Figures 1-4 As shown, a QFN packaged splicing mold socket insert structure includes a structural body 1, a mold socket insert 3 installed at the center of the top of the structural body 1, sprue bars 9 symmetrically arranged at both ends of the mold socket insert 3, mounting blocks 6 symmetrically installed at both ends of both sides of the mold socket insert 3, an adapter groove 4 opened at the top of the mold socket insert 3, a base 2 installed at the bottom of the structural body 1, movable grooves 14 symmetrically opened at both ends of the top of the structural body 1, a fixing rod 15 installed in the inner cavity of the movable groove 14, a spring 16 wound around the outer wall of the fixing rod 15, one end of the spring 16 installed in the inner cavity of the movable groove 14, movable blocks symmetrically installed on both sides of the sprue bars 9, the two sides of the movable blocks movably connected to the inner cavity of the movable groove 14 and sleeved on the outer wall of the fixing rod 15, and the spring 16... The other end of 6 is connected to the sprue strip 9. The top of the sprue strip 9 is provided with an injection port 10. A locking block 11 is installed on the side of the sprue strip 9 near the mold socket insert 3. A through groove 12 is provided in the inner cavity of the locking block 11. The through groove 12 communicates with the inner cavity of the injection port 10. A connecting groove 17 is symmetrically provided in the center of both ends of the mold socket insert 3. The injection port 10 communicates with the inner cavity of the connecting groove 17 through the through groove 12. The connecting groove 17 communicates with the inner cavity of the adapter groove 4. A positioning groove 5 is symmetrically provided at both ends of both sides of the mold socket insert 3. A positioning block 7 is installed on the side of the mounting block 6 near the mold socket insert 3. A reinforcing bolt 8 is threadedly connected to the mounting block 6. The positioning block 7 is inserted into the inner cavity of the mold socket insert 3 through the positioning groove 5. The mounting block 6 is installed on the structural body 1 through the reinforcing bolt 8.

[0024] The QFN series sprue bar 9 and mold socket insert 3 are separate components, requiring only assembly at the main body 1 for subsequent installation. Compared to the old-style integral type, this splicing method allows for direct replacement of the sprue bar 9 when its service life reaches its limit, and direct replacement of the mold socket insert 3 when damaged. This effectively improves production efficiency and reduces mold maintenance costs. The detachable movable block facilitates the replacement and installation of the sprue bar 9. The spring 16 keeps the sprue bar 9 retracted under normal conditions. When connecting the mold socket insert 3 and the sprue bar 9, they can be automatically spliced ​​together, allowing the locking block 11 to be directly inserted into the inner cavity of the connecting groove 17, facilitating subsequent sprue work on the mold socket insert 3. The mounting block 6, positioning block 7, and reinforcing bolt 8 reinforce both sides of the mold socket insert 3. Combined with the sprue bar 9 clamped at both ends of the mold socket insert 3, this further improves the stability of the mold socket insert 3 during operation, preventing shaking during molding.

[0025] It should be noted that this utility model is a QFN packaged splicing mold socket insert structure. When it is necessary to replace the mold socket insert 3, move the two sprue bars 9 to the opposite side, remove the reinforcing bolts 8, and take out the mounting block 6. At this time, the mold socket insert 3 can be removed. Place the new mold socket insert 3 on the top of the structure body 1. After releasing the sprue bars 9, the spring 16 can push the sprue bars 9 towards the mold socket insert 3 through the movable block, so that the sprue bars 9 can drive the locking block 11 to insert into the inner cavity of the connecting groove 17. At this time, the splicing can be completed.

[0026] When the sprue bar 9 needs to be replaced, remove the movable block and connect the new sprue bar 9 to the movable block. At this time, the replacement of the sprue bar 9 can be completed.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A QFN packaged splicing type molded insert structure, comprising a structural body (1), characterized in that: A mold socket insert (3) is installed at the center of the top of the structure body (1). Sprue strips (9) are symmetrically arranged at both ends of the mold socket insert (3). Mounting blocks (6) are symmetrically installed at both ends of both sides of the mold socket insert (3). An adapter groove (4) is opened on the top of the mold socket insert (3).

2. The QFN package tiled die insert structure of claim 1, wherein: The bottom of the structure body (1) is equipped with a base (2), and the top two sides of the structure body (1) are symmetrically provided with movable grooves (14). A fixed rod (15) is installed in the inner cavity of the movable groove (14), and a spring (16) is wound around the outer wall of the fixed rod (15).

3. The QFN package tiled die insert structure of claim 2, wherein: One end of the spring (16) is installed in the inner cavity of the movable groove (14). Movable blocks are symmetrically installed on both sides of the sprue bar (9). The two sides of the movable blocks are movably connected in the inner cavity of the movable groove (14) and sleeved on the outer wall of the fixed rod (15). The other end of the spring (16) is connected to the sprue bar (9).

4. The QFN package tiled die insert structure of claim 1, wherein: The top of the sprue bar (9) is provided with an injection port (10). A locking block (11) is installed on the side of the sprue bar (9) near the mold insert (3). A through groove (12) is provided in the inner cavity of the locking block (11), and the through groove (12) communicates with the inner cavity of the injection port (10).

5. The QFN package tiled die insert structure of claim 4, wherein: The mold insert (3) has symmetrical connecting grooves (17) at the center of both ends. The injection port (10) is connected to the inner cavity of the connecting groove (17) through the through groove (12). The connecting groove (17) is connected to the inner cavity of the adapter groove (4).

6. The QFN package tiled die insert structure of claim 1, wherein: The mold insert (3) has symmetrical positioning grooves (5) on both sides. The mounting block (6) has a positioning block (7) installed on the side close to the mold insert (3). The mounting block (6) is threaded with a reinforcing bolt (8). The positioning block (7) is inserted into the inner cavity of the mold insert (3) through the positioning groove (5). The mounting block (6) is installed on the structural body (1) through the reinforcing bolt (8).

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