Nitrogen protection device suitable for orbital heating eutectic sintering process

Abstract

The present application relates to a kind of nitrogen protection device suitable for track type heating eutectic sintering process, including main frame, nitrogen containing hole and the gas inlet hole being communicated with nitrogen containing hole are arranged on the main frame, nitrogen joint is arranged at the orifice of the gas inlet hole;The upper cover plate and lower cover plate are fixedly connected to the main frame, and the nitrogen containing hole is enclosed to form nitrogen containing cavity by the upper cover plate and lower cover plate;First through-hole is arranged on the upper cover plate, second through-hole is arranged on the lower cover plate, and orifice adjusting device is arranged at the second through-hole.In the present application, the size of second through-hole can be adjusted by orifice adjusting device, so that different sizes of tube shell can be compatible;After tube shell is embedded in orifice adjusting device, relatively sealed structure can be formed in the lower part of nitrogen containing cavity, so that low-oxygen-content nitrogen protection area is formed in nitrogen containing cavity, and the oxidation speed of solder under high temperature is delayed.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of chip mounting, and relates to a nitrogen protection device suitable for a track type heating eutectic sintering process. BACKGROUND

[0002] The eutectic sintering process has the advantages of high shear strength of mounted chips and good heat conduction effect, and is a commonly used mounting process in high-reliability electronic device packaging. In the automatic eutectic sintering process, the track transmission mode is often used to complete the conveying of the tube shell. When the tube shell is conveyed to the sintering area, the heating boss at the lower end of the track is lifted up and down to push the tube shell into the nitrogen protection device from the opening at the lower end of the nitrogen protection device, and then solder is added to the opening at the upper end of the nitrogen protection device to complete the heating of the tube shell, so as to achieve the purpose of eutectic sintering. When the track type heating eutectic sintering mode is used, in order to cope with tube shells of different sizes, the size of the heating boss varies greatly, so the opening at the lower end of the nitrogen protection device cannot be closed, it is difficult to form a relatively closed nitrogen protection environment in the nitrogen protection device, and it is difficult to effectively delay the oxidation of the solder at high temperature. SUMMARY

[0003] In view of the above problems of the prior art, the technical problem to be solved by the present application is to provide a nitrogen protection device suitable for a track type heating eutectic sintering process.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0005] A nitrogen protection device suitable for a track type heating eutectic sintering process, characterized in that: a main frame is provided, a nitrogen containing hole vertically penetrating through the upper end face and the lower end face of the main frame and an air inlet hole communicating with the nitrogen containing hole are arranged on the main frame, and a nitrogen joint is arranged at the hole opening of the air inlet hole; an upper cover plate is fixedly connected to the upper end of the main frame, a lower cover plate is fixedly connected to the lower end of the main frame, and the upper cover plate and the lower cover plate respectively close the two hole openings of the nitrogen containing hole, so as to enclose the nitrogen containing hole to form a nitrogen containing cavity; a first through hole is arranged on the upper cover plate, a second through hole corresponding to the first through hole is arranged on the lower cover plate, and a hole opening adjusting device is arranged at the second through hole, which is used to adjust the size of the second through hole.

[0006] Further, at least two positioning bosses are arranged on the upper end face of the main frame, and a notch corresponding to each positioning boss is arranged on the upper cover plate, and the shape of the notch is matched with the shape of the positioning boss.

[0007] Further, the main frame is in a rectangular shape, and a square positioning boss is arranged at each of the four corners of the upper end face of the main frame.

[0008] Furthermore, a plurality of fixing through holes are provided on the lower end surface of the main frame, and the plurality of fixing through holes are respectively located on both sides of the lower cover plate.

[0009] Furthermore, the first through hole and the second through hole are arranged on one side of the nitrogen containing chamber, and two air inlet holes are symmetrically arranged on the other side of the nitrogen containing chamber, and a nitrogen connector is respectively provided at the opening of each air inlet hole.

[0010] Furthermore, the second through hole is square, and the orifice adjustment device includes a first limit adjustment device for adjusting the size of the second through hole in the first direction and a second limit adjustment device for adjusting the size of the second through hole in the second direction.

[0011] Furthermore, the first limit adjustment device includes two first sliders arranged in parallel, and the first slider includes a first horizontal part; a sliding clearance groove is opened at a position corresponding to the first horizontal part on the bottom surface of the main frame, and the first horizontal part is arranged in the sliding clearance groove, and the two ends of the first horizontal part respectively extend outward from the two notches of the sliding clearance groove, and the two protruding ends of the first horizontal part are respectively bent upward 90° to form a first vertical part; the first vertical part is fitted with the outer wall of the main frame; a first waist-shaped groove is horizontally opened on the first vertical part, and a first fixing bolt is passed through the first waist-shaped groove, and the first fixing bolt is screwed and fixed to the main frame.

[0012] Furthermore, the thickness of the first horizontal portion is 0.1 mm, and the depth of the through groove is 0.2 mm.

[0013] Furthermore, a sliding groove is provided on the bottom surface of the main frame corresponding to each first horizontal portion; or

[0014] A sliding through slot is provided on the bottom surface of the main frame, and the two first horizontal parts are both provided in the sliding through slot.

[0015] Furthermore, the second limit adjustment device includes two second sliders arranged in parallel, the second slider includes a second horizontal part, and the second horizontal part is located below the lower cover plate; the two ends of the second horizontal part are respectively bent upward 90° to form a second vertical part; the second vertical part is in contact with the outer wall of the main frame; a second waist-shaped groove is horizontally opened on the second vertical part, and a second fixing bolt is passed through the second waist-shaped groove, and the second fixing bolt is screwed and fixed to the main frame.

[0016] In the present application, the size of the aperture of the second through hole can be adjusted by the aperture adjusting device, so that the size of the aperture of the second through hole is adapted to the size of the tube shell to be processed by eutectic sintering, thereby being compatible with tube shells of different sizes; after the tube shell is embedded in the aperture adjusting device, a relatively sealed structure can be formed in the lower part of the nitrogen containing cavity, thereby forming a low-oxygen-content nitrogen protection zone in the nitrogen containing cavity, delaying the oxidation speed of the solder in the high-temperature state, and improving the quality of eutectic sintering. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and serve to explain the principles of the application, and do not limit the application. In the drawings:

[0018] Figure 1 The present application is applicable to a preferred embodiment of a nitrogen protection device for a track type heating eutectic sintering process.

[0019] Figure 2 The bottom view of the aperture adjusting device is shown in FIG. 4. Figure 1

[0020] Figure 3 The structure diagram of the main frame is shown in FIG. 5.

[0021] Figure 4 The bottom view of the aperture adjusting device is shown in FIG. 4. Figure 3

[0022] The structure diagram of the upper cover plate is shown in FIG. 6. Figure 5

[0023] The structure diagram of the lower cover plate is shown in FIG. 7. Figure 6

[0024] The structure diagram of the first sliding block is shown in FIG. 8. Figure 7

[0025] The structure diagram of the second sliding block is shown in FIG. 9. Figure 8 The meanings of the reference numerals in the drawings are as follows:

[0026] Main frame-10; nitrogen containing hole-11; gas inlet hole-12, 13; nitrogen joint-14, 15; positioning boss-16; fixed through hole-17; sliding accommodation slot-18; first sliding block-20; first horizontal part-21; first vertical part-22; first waist-shaped slot-23; second sliding block-30; second horizontal part-31; second vertical part-32; second waist-shaped slot-33; first fixed bolt-41; second fixed bolt-42; upper cover plate-50; first through hole-51; notch-52; lower cover plate-60; second through hole-61.

[0027] DETAILED DESCRIPTION ​​

[0028] The following describes the implementation of the present invention through specific examples. The illustrations provided in the following embodiments are only used to schematically illustrate the basic concept of the present invention. The following embodiments and features in the embodiments may be combined with each other unless there is any conflict.

[0029] like Figure 1 and Figure 2 As shown, a preferred embodiment of the nitrogen protection device for the orbital heating eutectic sintering process of the present invention includes a main frame 10, which is rectangular and can be made of hard aluminum. Figure 3 and Figure 4 As shown, the main frame 10 is provided with a vertical through (i.e. along Figure 3 The invention discloses a nitrogen containing hole 11 on the upper and lower end surfaces of the nitrogen containing hole 11 and an air inlet hole (12, 13) connected to the nitrogen containing hole 11, wherein the nitrogen containing hole 11 can be rectangular; nitrogen connectors (14, 15) are provided at the openings of the air inlet holes (12, 13); the nitrogen connectors (14, 15) can be pagoda-shaped connectors with threads made of brass, and the pagoda-shaped connectors are fixed in the air inlet holes (12, 13) by screw thread connection.

[0030] like Figure 5 As shown, a rectangular upper cover plate 50 is fixedly connected to the upper end of the main frame 10. The upper cover plate 50 can be made of stainless steel. To facilitate the positioning of the upper cover plate 50, at least two positioning bosses 16 are provided on the upper end surface of the main frame 10. The upper cover plate 50 has a notch 52 corresponding to each positioning boss 16. The shape of the notch 52 matches the shape of the positioning boss 16. In this embodiment, a square positioning boss 16 is provided at each of the four corners of the upper end surface of the main frame 10, and a square notch 52 is provided at each of the four corners of the upper cover plate 50.

[0031] like Figure 6As shown, the lower end of the main frame 10 is fixedly connected with a lower cover plate 60, which can be made of stainless steel. The upper cover plate 50 and the lower cover plate 60 respectively close two orifices of the nitrogen containing hole 11, so as to enclose the nitrogen containing hole 11 to form a nitrogen containing cavity. The upper cover plate 50 is provided with a first through hole 51, which is used for adding solder into the nitrogen containing cavity during eutectic sintering. The lower cover plate 60 is provided with a second through hole 61 at a position corresponding to the first through hole 51, which is used for the heating boss to push the tube shell into the nitrogen containing cavity; the second through hole 61 is square. The second through hole 61 is provided with an orifice adjusting device, which is used for adjusting the size of the second through hole 61, so that the size of the second through hole 61 is adapted to the size of the tube shell. Preferably, the orifice adjusting device includes a first limiting adjusting device for adjusting the size of the second through hole 61 in the x-axis direction of the Figure 3 , and a second limiting adjusting device for adjusting the size of the second through hole 61 in the y-axis direction of the Figure 3 .

[0032] As shown in Figure 7 , the first limiting adjusting device includes two first sliders 20 arranged in parallel, which can be made of stainless steel. The first slider 20 includes a first horizontal part 21, and the bottom surface of the main frame 10 is provided with a sliding accommodation through slot 18 at a position corresponding to the first horizontal part 21, which penetrates the main frame 10 along the y-axis direction of the Figure 3 ; the first horizontal part 21 is arranged in the sliding accommodation through slot 18. The typical thickness of the first horizontal part 21 is 0.1 mm, and the typical depth of the sliding accommodation through slot 18 is 0.2 mm, so as to facilitate the first slider 20 to slide along the x-axis direction in the sliding accommodation through slot 18. In the embodiment, only one sliding accommodation through slot 18 is arranged on the bottom surface of the main frame 10, and both of the first horizontal parts 21 are arranged in the sliding accommodation through slot 18. Of course, one sliding accommodation through slot 18 can also be arranged on the bottom surface of the main frame 10 corresponding to each first horizontal part 21, that is, two sliding accommodation through slots 18 are arranged; the two first horizontal parts 21 are arranged in the two sliding accommodation through slots 18 respectively; at this time, the spacing between the two sliding accommodation through slots 18 is the minimum size that can be adjusted by the two first sliders 20 in the x-axis direction.

[0033] The two ends of the first horizontal portion 21 extend outward from two notches of the sliding clearance slot 18, and the two protruding ends of the first horizontal portion 21 are bent upward 90° to form the first vertical portion 22. Preferably, the two protruding ends of the first horizontal portion 21 are formed by upwardly bending sheet metal to form the first vertical portion 22, so that the first vertical portion 22 is in contact with the outer wall of the main frame 10. A first waist-shaped groove 23 is horizontally opened on the first vertical portion 22, and a first fixing bolt 41 is passed through the first waist-shaped groove 23. The first fixing bolt 41 is screwed and fixed to the main frame 10. The size of the first waist-shaped groove 23 can also limit the adjustment range of the two first sliders 20 in the x-axis direction.

[0034] like Figure 8 As shown, the second limit adjustment device includes two second sliders 30 arranged in parallel, and the second sliders 30 can be made of stainless steel. The second slider 30 includes a second horizontal portion 31, and the second horizontal portion 31 is located below the lower cover plate 60. The two ends of the second horizontal portion 31 are bent upward by 90° to form a second vertical portion 32; preferably, the two ends of the second horizontal portion 31 are respectively formed by upward sheet metal to form a second vertical portion 32, so that the second vertical portion 32 is in contact with the outer wall of the main frame 10. A second waist-shaped groove 33 is horizontally opened on the second vertical portion 32, and a second fixing bolt 42 is passed through the second waist-shaped groove 33, and the second fixing bolt 42 is screwed and fixed to the main frame 10. The size of the second waist-shaped groove 33 can limit the adjustment range of the two second sliders 30 in the y-axis direction.

[0035] In order to increase the distance that nitrogen moves after being injected into the nitrogen holding chamber, thereby facilitating heating of the nitrogen, the first through hole 51 and the second through hole 61 are preferably disposed on one side of the nitrogen holding chamber, and the air inlet holes (12, 13) are disposed on the other side of the nitrogen holding chamber. In this embodiment, two air inlet holes 12 and 13 are symmetrically disposed on the other side of the nitrogen holding chamber, with a nitrogen connector 14 disposed at the opening of the air inlet hole 12 and a nitrogen connector 15 disposed at the opening of the air inlet hole 13.

[0036] In order to facilitate the installation of the nitrogen protection device, a plurality of fixing through holes 17 are further provided on the main frame 10 , and the plurality of fixing through holes 17 are respectively located on both sides of the lower cover plate 60 ; the fixing through holes 17 are used to fix the nitrogen protection device during eutectic sintering.

[0037] The working principle of this embodiment is as follows:

[0038] like Figures 1 to 8 As shown, first adjust the positions of the two first sliders 20 and the two second sliders 30 according to the size of the tube shell; when the second through hole 61 needs to be adjusted Figure 3When adjusting the size in the x-axis direction, first loosen the first fixing bolt 41, then slide the two first sliders 20 to the desired position along the x-axis direction, and then tighten the first fixing bolt 41 to fix the first slider 20 to the main frame 10. Figure 3 When adjusting the size in the y-axis direction, first loosen the second fixing bolt 42, then slide the two second sliders 30 along the y-axis direction to the desired position, and then tighten the second fixing bolt 42 to fix the second slider 30 on the main frame 10.

[0039] The nitrogen protection device is fixedly mounted on the track-type eutectic sintering equipment through the fixed through-hole 17, and the nitrogen connector 14 and the nitrogen connector 15 are respectively connected to the nitrogen delivery pipe. During operation, the conveyor belt of the track-type eutectic sintering equipment transports the tube shell to the sintering area (i.e., below the second through-hole 61); the bottom heating boss of the track-type eutectic sintering equipment rises, pushing the tube shell upward and inserting the tube shell into the opening surrounded by the two first sliders 20 and the two second sliders 30, thereby closing the second through-hole 61 on the lower cover plate 60; at this point, the eutectic sintering process can be carried out. During this process, nitrogen enters the nitrogen holding chamber through the nitrogen connector 14 and the nitrogen connector 15 and moves toward the first through-hole 51. Since the distance between the nitrogen connector 14 and the nitrogen connector 15 and the first through-hole 51 is long, the movement distance of the nitrogen can be increased, so that the nitrogen gas is fully heated during the movement process. Since the second through hole 61 has been sealed, air convection between the first through hole 51 and the second through hole 61 can be avoided; therefore, after filling with nitrogen, the air in the nitrogen containing chamber can be discharged, forming a nitrogen protection zone with low oxygen content in the nitrogen containing chamber, thereby slowing down the oxidation rate of the solder under high temperature conditions.

[0040] In this embodiment, the size of the orifice of the second through hole 61 can be adjusted by the orifice adjustment device so that the orifice size of the second through hole 61 is compatible with the size of the tube shell that requires eutectic sintering, thereby being compatible with tube shells of different sizes. After the tube shell is embedded in the orifice adjustment device, a relatively sealed structure can be formed at the lower part of the nitrogen holding chamber, thereby forming a nitrogen protection zone with a low oxygen content within the nitrogen holding chamber, slowing the oxidation rate of the solder under high temperature conditions and improving the quality of eutectic sintering. In addition, by arranging the air inlet holes (12, 13) at a position away from the first through hole 51, the travel distance of the nitrogen can be increased, so that the nitrogen gas filled in can be fully heated.

[0041] Finally, it is to be explained that the above embodiments are only used to illustrate the technical solutions of the present application but not to limit the present application. Although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions, and all should be covered in the scope of the claims of the present application.

Claims

1. A nitrogen protection device suitable for orbital heating eutectic sintering process, characterized by: The apparatus comprises a main frame, wherein the main frame is provided with a nitrogen receiving hole vertically penetrating the upper and lower end surfaces thereof, and an air inlet hole communicating with the nitrogen receiving hole, and a nitrogen connector is provided at the opening of the air inlet hole; an upper cover plate is fixedly connected to the upper end of the main frame, and a lower cover plate is fixedly connected to the lower end of the main frame, wherein the upper and lower cover plates respectively close the two openings of the nitrogen receiving hole, thereby enclosing the nitrogen receiving hole to form a nitrogen receiving chamber; a first through hole is provided on the upper cover plate, and a second through hole is provided on the lower cover plate at a position corresponding to the first through hole, and an orifice adjustment device is provided at the second through hole, wherein the orifice adjustment device is used to adjust the size of the second through hole; The first through hole and the second through hole are provided on one side of the nitrogen containing chamber, and two air inlet holes are symmetrically provided on the other side of the nitrogen containing chamber, and a nitrogen connector is provided at the opening of each air inlet hole; The second through hole is square, and the orifice adjustment device includes a first limit adjustment device for adjusting the size of the second through hole in a first direction and a second limit adjustment device for adjusting the size of the second through hole in a second direction.

2. The nitrogen protection device suitable for the orbital heating eutectic sintering process according to claim 1, characterized in that: At least two positioning bosses are provided on the upper end surface of the main frame, and a notch is provided on the upper cover plate at a position corresponding to each positioning boss, and the shape of the notch matches the shape of the positioning boss.

3. The nitrogen protection device suitable for the orbital heating eutectic sintering process according to claim 2, characterized in that: The main frame is rectangular, and a square positioning boss is respectively provided at the four corners of the upper end surface of the main frame.

4. The nitrogen protection device suitable for the orbital heating eutectic sintering process according to claim 1, characterized in that: A plurality of fixing through holes are provided on the lower end surface of the main frame, and the plurality of fixing through holes are respectively located on both sides of the lower cover plate.

5. The nitrogen protection device suitable for orbital heating eutectic sintering process according to any one of claims 1 to 4, characterized in that: The first limit adjustment device includes two first sliders arranged in parallel, and the first slider includes a first horizontal part; a sliding clearance groove is opened at a position corresponding to the first horizontal part on the bottom surface of the main frame, and the first horizontal part is arranged in the sliding clearance groove, and the two ends of the first horizontal part respectively extend outward from the two notches of the sliding clearance groove; the two protruding ends of the first horizontal part are respectively bent upward 90° to form a first vertical part; the first vertical part is fitted with the outer wall of the main frame; a first waist-shaped groove is horizontally opened on the first vertical part, and a first fixing bolt is passed through the first waist-shaped groove, and the first fixing bolt is screwed and fixed to the main frame.

6. The nitrogen protection device suitable for the orbital heating eutectic sintering process according to claim 5, characterized in that: The thickness of the first horizontal portion is 0.1 mm, and the depth of the through groove is 0.2 mm.

7. The nitrogen protection device suitable for the orbital heating eutectic sintering process according to claim 5, characterized in that: A sliding groove is provided on the bottom surface of the main frame corresponding to each first horizontal portion; or A sliding through slot is provided on the bottom surface of the main frame, and the two first horizontal parts are both provided in the sliding through slot.

8. The nitrogen protection device suitable for orbital heating eutectic sintering process according to any one of claims 1 to 4, characterized in that: The second limit adjustment device includes two second sliders arranged in parallel, and the second slider includes a second horizontal part, which is located below the lower cover plate; the two ends of the second horizontal part are bent upward 90° to form a second vertical part; the second vertical part is in contact with the outer wall of the main frame; a second waist-shaped groove is horizontally opened on the second vertical part, and a second fixing bolt is passed through the second waist-shaped groove, and the second fixing bolt is screwed and fixed to the main frame.

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