Small QFN (Quad Flat No-lead) special-shaped frame packaging process

Abstract

The invention provides a small QFN special-shaped frame packaging technology, and relates to the technical field of QFN packaging, and the technology comprises the following steps: S1, installing a single chip on a frame unit, and enabling the chip to be connected with a pin in the frame unit through a bonding wire; s2, an arc-shaped plastic package mold is installed on the whole special-shaped frame; s3, the special-shaped frame and the arc-shaped plastic packaging mold are installed in an injection molding device for injection molding; and S4, after cooling, cutting is carried out according to the position of the chip. By arranging the arc-shaped plastic package mold, a plastic package body with the thick middle and the two thin sides can be formed on the special-shaped frame after injection molding, and when the plastic package material is solidified, due to the fact that the edge of the special-shaped frame shrinks and the thickness of the plastic package material in the center of the frame is large, the tensile stress of the edge and the supporting force of the middle counteract; the stress on the whole special-shaped frame can be uniform, the probability of warping is greatly reduced, the damage rate of the chip is also greatly reduced, and the economical efficiency and the practicability are higher.

Description

Technical Field

[0001] The present invention relates to the technical field of QFN packaging, and particularly relates to a packaging process for small QFN special-shaped frames. Background Art

[0002] The chip industry chain can be divided into three major fields: circuit design, wafer manufacturing, and chip packaging and testing. As terminal electronic products continue to develop towards being thinner, lighter, and more intelligent, challenges and opportunities are also presented for the packaging forms of IC chips. The demand for QFN packaging with good electrothermal performance, small size, and light weight has grown rapidly and gradually replaced other traditional packaging forms;

[0003] When the existing QFN is injection-molded, the thickness of the injection molding on the frame is generally the same. When it cools and solidifies, the injection plastic shrinks, and the edges of the entire frame will be subjected to tensile stress, that is, the edge positions will bend towards the middle position, and the bent positions are likely to damage the chip, resulting in poor economy. Summary of the Invention

[0004] The present invention provides a packaging process for small QFN special-shaped frames to solve the problems raised in the above background art.

[0005] To solve the above technical problems, the present invention discloses a packaging process for small QFN special-shaped frames, including the following steps:

[0006] S1: Install individual chips onto the frame units respectively, and connect the chips to the pins inside the frame units with bonding wires;

[0007] S2: Install an arc-shaped plastic encapsulation mold on the entire special-shaped frame;

[0008] S3: Install the special-shaped frame and the arc-shaped plastic encapsulation mold into an injection molding device for injection molding;

[0009] S4: After cooling, cut according to the positions of the chips.

[0010] Preferably, in step S3, the injection molding device includes a housing. A support rod is fixedly arranged on the inner wall of the lower side of the housing. A sphere is fixedly arranged on the support rod. A vibrating disk is installed on the sphere. A plurality of springs are annularly arranged on the lower surface of the vibrating disk, and the springs are fixedly connected to the lower surface of the housing. A limiting mechanism is arranged on the vibrating disk. An installation block is detachably installed on the vibrating disk. The limiting mechanism is used to limit the installation block. The special-shaped frame and the arc-shaped plastic encapsulation mold are installed on the installation block.

[0011] Preferably, a driving motor is arranged on the upper side of the housing. A hollow cylinder is fixedly arranged through the housing. The driving motor is fixedly arranged on the hollow cylinder. A rotating rod is fixedly arranged at the lower output end of the driving motor. Conveying blades are arranged on the rotating rod. The lower side of the hollow cylinder is rotatably connected with a rotating cylinder. A connecting rod is fixedly arranged at the lower end of the rotating rod. The connecting rod is fixedly connected with the rotating cylinder. The lower side of the rotating cylinder is rotatably connected with a conveying cylinder. The conveying cylinder is detachably connected with the arc-shaped plastic sealing die.

[0012] Preferably, a fixing plate is fixedly arranged on the rotating cylinder. An installation cylinder is fixedly arranged on the fixing plate. A rotating shaft is arranged in the installation cylinder. The rotating shaft rotates upward through the fixing plate. A first gear is fixedly arranged at the upper end of the rotating shaft. A reciprocating lead screw is arranged on the rotating shaft. A moving block is threadedly connected to the reciprocating lead screw. The moving block is slidably connected to the inner wall of the installation cylinder. A driving cylinder is fixedly arranged at the lower end of the moving block. The reciprocating lead screw extends into the driving cylinder. A traveling mechanism is arranged at the lower end of the driving cylinder.

[0013] Preferably, the traveling mechanism includes a cross plate fixedly arranged at the lower end of the driving cylinder. Vertical plates are symmetrically arranged at the lower end of the cross plate. A traveling rod is rotatably arranged on the side of the vertical plates close to each other. Traveling wheels are fixedly arranged on the traveling rod. The traveling wheels cooperate with the vibrating disk; a telescopic rod is also arranged on the cross plate. The upper end of the telescopic rod is fixedly connected to the fixing plate.

[0014] Preferably, a plurality of vertical rods are fixedly arranged on the lower surface of the housing. The same toothed ring is fixedly arranged at the lower ends of the vertical rods. The first gear is meshed with the toothed ring.

[0015] Preferably, an L-shaped plate is fixedly arranged on the cross plate. A lifting rod is slidably arranged through the L-shaped plate. A lifting block is fixedly arranged at the upper end of the lifting rod. A return spring is fixedly arranged at the lower end of the lifting block. The return spring is sleeved on the lifting rod. The other end of the return spring is fixedly connected to the L-shaped plate. A stabilizing plate is fixedly arranged at the lower end of the lifting rod. The stabilizing plate is slidably arranged on the vertical plate away from the mounting block. A striking rod is fixedly arranged at the lower end of the stabilizing plate. The traveling rod rotates through the vertical plate away from the mounting block. A cam is fixedly arranged on the traveling rod. The cam is used to drive the stabilizing plate to move.

[0016] Preferably, the limiting mechanism includes a plurality of grooves and an annular groove. The grooves communicate with the annular groove. L-shaped clamping blocks are slidably arranged in the grooves. The L-shaped clamping blocks are used to clamp the mounting block. Extending rods are fixedly arranged on the horizontal sections of the L-shaped clamping blocks.

[0017] Preferably, an annular plate is slidably arranged in the annular groove. A plurality of inclined grooves are arranged on the annular plate. The extending rods extend into the inclined grooves and cooperate with the inclined grooves. Arc-shaped toothed plates are symmetrically arranged on the annular plate. Driving members are symmetrically installed on the lower surface of the vibrating disk. The output end of the driving member is fixedly connected to a driving rod. The driving rod extends upward and rotates through the vibrating disk. A second gear is fixedly arranged at the upper end of the driving rod. The second gear is meshed with the arc-shaped toothed plate.

[0018] Preferably, the arc-shaped plastic encapsulation mold includes a high-temperature resistant hose and an arc-shaped cavity. The arc-shaped cavity is detachably connected to the special-shaped frame. A groove is provided on the upper surface of the mounting block. The special-shaped frame and the arc-shaped cavity are installed in the groove. The high-temperature resistant hose and the conveying cylinder are detachably connected.

[0019] Compared with the prior art, the present invention provides a small QFN special-shaped frame encapsulation process, which has the following beneficial effects. By setting the arc-shaped plastic encapsulation mold, a plastic encapsulation body with a thick middle and thin sides can be formed on the special-shaped frame after injection molding. When the plastic encapsulation material solidifies, due to the shrinkage of the edge of the special-shaped frame and the relatively large thickness of the plastic encapsulation material in the center of the frame, the tensile stress at the edge and the supporting force in the middle cancel each other out, so that the stress on the entire special-shaped frame is uniform, the probability of warping is greatly reduced, and the damage rate of the chip is also greatly reduced, making it more economical and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0021] In the drawings:

[0022] Figure 1 is a schematic flow chart of the present invention;

[0023] Figure 2 is a schematic structural diagram of the special-shaped frame of the present invention;

[0024] Figure 3 is a schematic structural diagram of the injection molding device of the present invention;

[0025] Figure 4 is a schematic internal structure diagram of the hollow cylinder of the present invention;

[0026] Figure 5 is a schematic internal structure diagram of the mounting cylinder of the present invention;

[0027] Figure 6 is of the present invention Figure 4 magnified view of part A;

[0028] Figure 7 is of the present invention Figure 6 side view;

[0029] Figure 8 is a schematic connection diagram of the annular groove and the groove of the present invention;

[0030] Figure 9 is a top view of the vibrating disk of the present invention;

[0031] Figure 10 is a schematic structural diagram of the arc-shaped plastic encapsulation mold of the present invention;

[0032] Figure 11 is the top view of the present invention Figure 10 .

[0033] In the figure: 1, special-shaped frame; 2, pins; 3, bonding wires; 4, frame unit; 5, chip; 6, drive motor; 7, housing; 8, mounting cylinder; 9, first gear; 10, hollow cylinder; 11, feed pipe; 12, vertical rod; 13, toothed ring; 14, arc-shaped plastic sealing mold; 15, mounting block; 16, spring; 17, vibrating disk; 18, support rod; 19, sphere; 20, driving member; 21, L-shaped clamping block; 22, rotating rod; 23, conveying blade; 24, fixing plate; 25, rotating cylinder; 26, conveying cylinder; 27, arc-shaped cavity; 28, telescopic rod; 29, rotating shaft; 30, reciprocating lead screw; 31, driving cylinder; 32, moving block; 33, vertical plate; 34, walking rod; 35, walking wheel; 36, striking rod; 37, cam; 38, stabilizing plate; 39, lifting rod; 40, L-shaped plate; 41, return spring; 42, lifting block; 43, annular groove; 44, groove; 45, extending rod; 46, high-temperature resistant hose; 47, second gear; 48, arc-shaped toothed plate; 49, annular plate; 50, inclined groove; 51, horizontal plate. Specific embodiments

[0034] The following describes the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not used to limit the present invention.

[0035] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes, and do not particularly refer to the order or sequence. Nor are they used to limit the present invention. They are merely used to distinguish components or operations described with the same technical terms, and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions and technical features between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] Embodiment 1

[0037] An embodiment of the present invention provides a packaging process for a small QFN special-shaped frame, as Figures 1-11 shown, including the following steps:

[0038] S1: Mount a single chip 5 onto the frame unit 4 respectively, and connect the chip 5 to the pin 2 inside the frame unit 4 with a bonding wire 3;

[0039] S2: Mount an arc-shaped plastic encapsulation mold 14 onto the entire special-shaped frame 1;

[0040] S3: Mount the special-shaped frame 1 and the arc-shaped plastic encapsulation mold 14 into an injection molding device for injection molding;

[0041] S4: After cooling, perform cutting according to the position of the chip 5.

[0042] The working principle and beneficial effects of the above technical solution are as follows: Mount several single chips 5 onto the frame unit 4 respectively, and connect the chip 5 to the pin 2 inside the frame unit 4 with a bonding wire 3; Mount an arc-shaped plastic encapsulation mold 14 onto the entire special-shaped frame 1; Mount the special-shaped frame 1 and the arc-shaped plastic encapsulation mold 14 into an injection molding device for injection molding; After cooling, cut the special-shaped frame 1 according to the position of the chip 5; By setting the arc-shaped plastic encapsulation mold 14, a plastic encapsulation body with a thick middle and thin sides can be formed on the special-shaped frame 1 after injection molding. When the plastic encapsulation material solidifies, due to the shrinkage of the edge of the special-shaped frame 1 and the relatively large thickness of the plastic encapsulation material in the center of the frame, the tensile stress at the edge and the supporting force in the middle cancel each other out, which can make the stress received by the entire special-shaped frame 1 uniform, greatly reduce the probability of warping, and also greatly reduce the damage rate of the chip, with stronger economy and practicability.

[0043] Embodiment 2

[0044] Based on the above Embodiment 1, as Figures 3-4 shown, in step S3, the injection molding device includes a housing 7. A support rod 18 is fixedly arranged on the inner wall of the lower side of the housing 7. A sphere 19 is fixedly arranged on the support rod 18. A vibrating disk 17 is mounted on the sphere 19. A plurality of springs 16 are arranged in a ring on the lower surface of the vibrating disk 17. The springs 16 are fixedly connected to the lower surface of the housing 7. A limiting mechanism is arranged on the vibrating disk 17. An installation block 15 is detachably mounted on the vibrating disk 17. The limiting mechanism is used to limit the installation block 15. The special-shaped frame 1 and the arc-shaped plastic encapsulation mold 14 are mounted on the installation block 15.

[0045] Among them, preferably, a driving motor 6 is arranged on the upper side of the housing 7. A hollow cylinder 10 is fixedly penetrated through the housing 7. A feed pipe 11 is communicated with the hollow cylinder 10. The driving motor 6 is fixedly arranged on the hollow cylinder 10. A rotating rod 22 is fixedly arranged at the lower output end of the driving motor 6. A conveying blade 23 is arranged on the rotating rod 22. The lower side of the hollow cylinder 10 is rotatably connected to a rotating cylinder 25. A connecting rod is fixedly arranged at the lower end of the rotating rod 22. The connecting rod is fixedly connected to the rotating cylinder 25. The lower side of the rotating cylinder 25 is rotatably connected to a conveying cylinder 26. The conveying cylinder 26 is detachably connected to the arc-shaped plastic encapsulation mold 14.

[0046] The working principle and beneficial effects of the above technical solution are as follows: First, install the special-shaped frame 1 and the arc-shaped plastic sealing mold 14 on the mounting block 15, then install the mounting block 15 on the vibrating disk 17, start the limiting mechanism to limit the mounting block 15, and then feed through the feed pipe 11. Start the driving motor 6, the driving motor 6 drives the rotating rod 22 to rotate, the rotating rod 22 drives the conveying blade 23, and the plastic sealing material enters the arc-shaped plastic sealing mold 14 after passing through the hollow cylinder 10, the rotating cylinder 25 and the conveying cylinder 26, so as to plastic-seal the special-shaped frame 1; By setting the limiting mechanism, the mounting block 15 can be limited, and further the special-shaped frame 1 and the arc-shaped plastic sealing mold 14 can be limited; And by setting the detachable connection between the conveying cylinder 26 and the arc-shaped plastic sealing mold 14 and the limiting mechanism for the mounting block 15, the mounting block 15 can be quickly taken and placed, and the arc-shaped plastic sealing mold 14 can also be quickly taken and placed, with stronger convenience; And by setting the conveying blade 23, the plastic sealing material can enter the arc-shaped plastic sealing mold 14 evenly, and the conveying is more stable.

[0047] Embodiment 3

[0048] Based on the above Embodiment 2, as Figures 3-6 shown, a fixing plate 24 is fixedly arranged on the rotating cylinder 25, an installation cylinder 8 is fixedly arranged on the fixing plate 24, a rotating shaft 29 is arranged in the installation cylinder 8, the rotating shaft 29 rotates upward through the fixing plate 24, a first gear 9 is fixedly arranged at the upper end of the rotating shaft 29, a reciprocating lead screw 30 is arranged on the rotating shaft 29, a moving block 32 is threadedly connected to the reciprocating lead screw 30, the moving block 32 is slidably connected to the inner wall of the installation cylinder 8, a driving cylinder 31 is fixedly arranged at the lower end of the moving block 32, the reciprocating lead screw 30 extends into the driving cylinder 31, and a traveling mechanism is arranged at the lower end of the driving cylinder 31.

[0049] Among them, preferably, the traveling mechanism includes a cross plate 51, the cross plate 51 is fixedly arranged at the lower end of the driving cylinder 31, vertical plates 33 are symmetrically arranged at the lower end of the cross plate 51, a traveling rod 34 is rotatably arranged on the side of the vertical plates 33 close to each other, a traveling wheel 35 is fixedly arranged on the traveling rod 34, and the traveling wheel 35 cooperates with the vibrating disk 17; A telescopic rod 28 is also arranged on the cross plate 51, and the upper end of the telescopic rod 28 is fixedly connected to the fixing plate 24.

[0050] Among them, preferably, a plurality of vertical rods 12 are fixedly arranged on the lower surface of the housing 7, and the same toothed ring 13 is fixedly arranged at the lower ends of the vertical rods 12, and the first gear 9 is meshed with the toothed ring 13.

[0051] The working principle and beneficial effects of the above technical solution are as follows: When the rotating rod 22 rotates, the rotating rod 22 drives the rotating cylinder 25 to rotate. The rotating cylinder 25 drives the fixed plate 24 to revolve around the center of the hollow cylinder 10. The fixed plate 24 drives the mounting cylinder 8 to revolve. The mounting cylinder 8 drives the rotating shaft 29 to revolve. The first gear 9 on the rotating shaft 29 will rotate under the meshing action of the toothed ring 13. The first gear 9 drives the rotating shaft 29 to rotate on its own axis. The rotating shaft 29 drives the reciprocating lead screw 30 to rotate. The reciprocating lead screw 30 drives the moving block 32 to move up and down. The moving block 32 drives the driving cylinder 31 to move up and down. The driving cylinder 31 drives the cross plate 51 to move up and down. The cross plate 51 drives the two vertical plates 33 to move up and down, so that the traveling wheels 35 come into contact with the vibrating plate 17 (initially, the traveling wheels 35 are not in contact with the vibrating plate 17), and press the vibrating plate 17, causing one side of the vibrating plate 17 to move downward. When the vertical plate 33 moves upward, that is, when the traveling wheels 35 are no longer in contact with the vibrating plate 17, the vibrating plate 17 returns to its original state under the action of several springs 16, so as to vibrate the plastic sealing liquid in the arc-shaped plastic sealing mold 14. When injecting plastic into the inside of the arc-shaped plastic sealing mold 14, air bubbles that may exist in the plastic sealing material can be effectively removed, so that the plastic sealing effect is better and the practicability is stronger.

[0052] Example 4

[0053] On the basis of the above Example 3, as Figures 3-7 shown, an L-shaped plate 40 is fixedly arranged on the cross plate 51. A lifting rod 39 is slidably penetrated through the L-shaped plate 40. The upper end of the lifting rod 39 is fixedly provided with a lifting block 42. A reset spring 41 is fixedly arranged at the lower end of the lifting block 42. The reset spring 41 is sleeved on the lifting rod 39. The other end of the reset spring 41 is fixedly connected to the L-shaped plate 40. A stabilizing plate 38 is fixedly arranged at the lower end of the lifting rod 39. The stabilizing plate 38 is slidably arranged on the vertical plate 33 away from the mounting block 15. A striking rod 36 is fixedly arranged at the lower end of the stabilizing plate 38. The traveling rod 34 rotates through the vertical plate 33 away from the mounting block 15. A cam 37 is fixedly arranged on the traveling rod 34. The cam 37 is used to drive the stabilizing plate 38 to move.

[0054] Among them, a friction pad is arranged on the traveling wheel 35, and an annular friction plate is arranged on the vibrating plate 17 to increase the friction between the traveling wheel 35 and the vibrating plate 17.

[0055] The working principle and beneficial effects of the above technical solution are as follows: When the walking wheel 35 contacts the vibrating disk 17, under the action of friction, the walking wheel 35 will start to rotate. The walking wheel 35 drives the walking rod 34 to rotate, the walking rod 34 drives the cam 37 to rotate, the cam 37 drives the stabilizing plate 38 to move upward, the stabilizing plate 38 drives the striking rod 36 and the lifting rod 39 to rise. When the cam 37 continues to rotate and the cam 37 is no longer in contact with the stabilizing plate 38, under the action of the return spring 41, the lifting block 42 quickly descends, and the lifting block 42 drives the lifting rod 39, the stabilizing plate 38 and the striking rod 36 to quickly descend, so that the striking rod 36 strikes on the vibrating disk 17, thereby causing the vibrating disk 17 to vibrate. The vibrating disk 17 drives the mounting block 15 to vibrate together, and the mounting block 15 causes the arc-shaped plastic sealing mold 14 to vibrate together, so that the plastic sealing liquid injected into the arc-shaped plastic sealing mold 14 can escape as much as possible, further removing the bubbles in the plastic sealing material, making the plastic sealing effect better and more practical. Moreover, only through the action of a driving motor 6, the conveying of the plastic sealing material, the deflection of the vibrating disk 17 and the vibration of the vibrating disk 17 can be achieved, and the cooperation degree of the whole device is higher and more practical.

[0056] Embodiment 5

[0057] On the basis of the above Embodiments 1-4, as Figure 3 、 Figures 8-9 shown, the limiting mechanism includes a plurality of grooves 44 and an annular groove 43. The grooves 44 communicate with the annular groove 43. L-shaped clamping blocks 21 are slidably arranged in the grooves 44. The L-shaped clamping blocks 21 are used to clamp the mounting block 15. Extension rods 45 are fixedly arranged on the horizontal sections of the L-shaped clamping blocks 21.

[0058] Among them, preferably, an annular plate 49 is slidably arranged in the annular groove 43. A plurality of inclined grooves 50 are arranged on the annular plate 49. The extension rods 45 extend into the inclined grooves 50 and are matched with the inclined grooves 50. Arc-shaped toothed plates 48 are symmetrically arranged on the annular plate 49. Driving members 20 are symmetrically installed on the lower surface of the vibrating disk 17. The output ends of the driving members 20 are fixedly connected with driving rods. The driving rods extend upward and rotate through the vibrating disk 17. A second gear 47 is fixedly arranged at the upper end of the driving rod. The second gear 47 is meshed with the arc-shaped toothed plate 48.

[0059] The working principle and beneficial effects of the above technical solution are as follows: When the mounting block 15 is installed into the housing 7, the driving member 20 is started. The driving member 20 drives the driving rod to rotate, the driving rod drives the second gear 47 to rotate, the second gear 47 drives the arc-shaped toothed plate 48 to rotate, the arc-shaped toothed plate 48 drives the annular plate 49 to rotate, and the rotation of the annular plate 49 causes the protruding rod 45 to slide in the inclined groove 50. The protruding rod 45 moves toward the side close to the mounting block 15, and the protruding rod 45 drives the L-shaped clamping block 21 to move, so that a plurality of L-shaped clamping blocks 21 clamp the mounting block 15, thereby completing the limiting operation of the mounting block 15; through the rising structure, the mounting block 15 can be quickly clamped, which is more convenient to use and the clamping limit is more stable.

[0060] Embodiment 6

[0061] On the basis of the above Embodiments 1-5, as Figure 3 、 Figures 10-11 shown, the arc-shaped plastic sealing mold 14 includes a high-temperature-resistant hose 46 and an arc-shaped cavity 27. The arc-shaped cavity 27 is detachably connected to the special-shaped frame 1. A groove is formed on the upper surface of the mounting block 15. The special-shaped frame 1 and the arc-shaped cavity 27 are installed in the groove, and the high-temperature-resistant hose 46 and the conveying cylinder 26 are detachably connected.

[0062] The beneficial effects of the above technical solution are as follows: By forming a groove on the upper surface of the mounting block 15, the special-shaped frame 1 and the arc-shaped cavity 27 can be quickly installed; the detachable connection between the arc-shaped cavity 27 and the special-shaped frame 1 can be set in a clamping manner; the connection between the arc-shaped cavity 27 and the groove can also adopt a clamping manner, making the connection more convenient and stable; and through the detachable connection between the high-temperature-resistant hose 46 and the conveying cylinder 26, the connection of the arc-shaped plastic sealing mold 14 can be quickly completed, and the setting of the high-temperature-resistant hose 46 can ensure that the vibration plate 17 deflects and vibrates without affecting the conveying of the plastic sealing material. By setting the arc-shaped cavity 27, an arc-shaped plastic sealing body can be formed on the special-shaped frame 1, effectively balancing stress and having stronger practicability.

[0063] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. If these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A small QFN special-shaped frame packaging process, characterized in that: The following steps are involved: S1: installing a single chip (5) on a frame unit (4) respectively, and connecting the chip (5) to a pin (2) in the frame unit (4) using a bonding wire (3); S2: Installing an arc-shaped plastic sealing mold (14) on the entire special-shaped frame (1); S3: installing the special-shaped frame (1) and the arc-shaped plastic sealing mold (14) into an injection molding device for injection molding; S4: After cooling, cutting is performed according to the position of the chip (5).

2. A small QFN special-shaped frame packaging process according to claim 1, characterized in that: In step S3, the injection molding device comprises a housing (7), a support rod (18) is fixedly arranged on the inner wall of the lower side of the housing (7), a sphere (19) is fixedly arranged on the support rod (18), a vibration disk (17) is installed on the sphere (19), a plurality of springs (16) are arranged in an annular shape on the lower surface of the vibration disk (17), the springs (16) are fixedly connected to the lower surface of the housing (7), a limiting mechanism is arranged on the vibration disk (17), a mounting block (15) is detachably mounted on the vibration disk (17), the limiting mechanism is used to limit the mounting block (15), and a special-shaped frame (1) and an arc-shaped plastic sealing mold (14) are installed on the mounting block (15).

3. A small QFN special-shaped frame packaging process according to claim 2, characterized in that: A driving motor (6) is arranged on the upper side of the shell (7); a hollow cylinder (10) is fixedly arranged through the shell (7); a feeding pipe (11) is arranged through the hollow cylinder (10); a driving motor (6) is fixedly arranged on the hollow cylinder (10); a rotating rod (22) is fixedly arranged at the output end of the lower side of the driving motor (6); a conveying blade (23) is arranged on the rotating rod (22); a rotating cylinder (25) is rotatably connected to the lower side of the hollow cylinder (10); a connecting rod is fixedly arranged at the lower end of the rotating rod (22); the connecting rod is fixedly connected to the rotating cylinder (25); a conveying cylinder (26) is rotatably connected to the lower side of the rotating cylinder (25); and the conveying cylinder (26) is detachably connected to the arc-shaped plastic sealing mold (14).

4. A small QFN special-shaped frame packaging process according to claim 3, characterized in that: A fixed plate (24) is fixedly arranged on the rotating cylinder (25), a mounting cylinder (8) is fixedly arranged on the fixing plate (24), a rotating shaft (29) is arranged inside the mounting cylinder (8), the rotating shaft (29) rotates upward and passes through the fixing plate (24), a gear 1 (9) is fixedly arranged on the upper end of the rotating shaft (29), a reciprocating screw (30) is arranged on the rotating shaft (29), a moving block (32) is threadedly connected to the reciprocating screw (30), the moving block (32) is slidably connected to the inner wall of the mounting cylinder (8), a driving cylinder (31) is fixedly arranged on the lower end of the moving block (32), the reciprocating screw (30) extends into the driving cylinder (31), and a walking mechanism is arranged at the lower end of the driving cylinder (31).

5. A small QFN special-shaped frame packaging process according to claim 4, characterized in that: The walking mechanism comprises a horizontal plate (51), which is fixedly arranged at the lower end of the driving cylinder (31), and a vertical plate (33) is symmetrically arranged at the lower end of the horizontal plate (51), and a walking rod (34) is rotatably arranged on one side of the vertical plates (33) close to each other, and a walking wheel (35) is fixedly arranged on the walking rod (34), and the walking wheel (35) cooperates with the vibration plate (17); a telescopic rod (28) is also arranged on the horizontal plate (51), and the upper end of the telescopic rod (28) is fixedly connected to the fixed plate (24).

6. A small QFN special-shaped frame packaging process according to claim 4, characterized in that: A plurality of vertical rods (12) are fixedly arranged on the lower surface of the housing (7), a same gear ring (13) is fixedly arranged at the lower end of the vertical rods (12), and the gear 1 (9) is meshingly connected with the gear ring (13).

7. A small QFN special-shaped frame packaging process according to claim 5, characterized in that: An L-shaped plate (40) is fixedly arranged on the transverse plate (51), a lifting rod (39) is slidably arranged on the L-shaped plate (40), a lifting block (42) is fixedly arranged on the upper end of the lifting rod (39), a return spring (41) is fixedly arranged on the lower end of the lifting block (42), the return spring (41) is sleeved on the lifting rod (39), the other end of the return spring (41) is fixedly connected to the L-shaped plate (40), a stabilizing plate (38) is fixedly arranged on the lower end of the lifting rod (39), the stabilizing plate (38) is slidably arranged on the vertical plate (33) away from the mounting block (15), a striking rod (36) is fixedly arranged on the lower end of the stabilizing plate (38), a walking rod (34) rotates and passes through the vertical plate (33) away from the mounting block (15), a cam (37) is fixedly arranged on the walking rod (34), and the cam (37) is used to drive the stabilizing plate (38) to move.

8. The small QFN special-shaped frame packaging process according to claim 3, characterized in that: The limiting mechanism comprises a plurality of grooves (44) and an annular groove (43), the grooves (44) and the annular groove (43) are connected, an L-shaped clamping block (21) is slidably arranged in each groove (44), the L-shaped clamping block (21) is used to clamp the mounting block (15), and a protruding rod (45) is fixedly arranged on the horizontal section of the L-shaped clamping block (21).

9. A small QFN special-shaped frame packaging process according to claim 8, characterized in that: An annular plate (49) is slidably arranged in the annular groove (43), and a plurality of oblique grooves (50) are arranged on the annular plate (49). The extension rod (45) extends into the oblique groove (50), and the extension rod (45) matches the oblique groove (50). An arc-shaped tooth plate (48) is symmetrically arranged on the annular plate (49). A driving member (20) is symmetrically installed on the lower surface of the vibration disk (17). The output end of the driving member (20) is fixedly connected to the driving rod, and the driving rod extends upward and rotates to pass through the vibration disk (17). A second gear (47) is fixedly arranged on the upper end of the driving rod, and the second gear (47) is meshed and connected with the arc-shaped tooth plate (48).

10. A small QFN special-shaped frame packaging process according to claim 9, characterized in that: The arc-shaped plastic sealing mold (14) comprises a high temperature protection hose (46) and an arc-shaped cavity (27), the arc-shaped cavity (27) is detachably connected to the special-shaped frame (1), a groove is provided on the upper surface of the mounting block (15), the special-shaped frame (1) and the arc-shaped cavity (27) are mounted in the groove, and the high temperature protection hose (46) and the conveying cylinder (26) are detachably connected.

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