A microwave composite heating sintering device for nano-tin-silver-copper solder paste

Abstract

The utility model discloses a microwave composite heating sintering device for nano-tin-silver-copper solder paste, comprising a shell, a material transfer mechanism and a monitoring mechanism, wherein a sealing door and an equipment door are rotatably connected to the shell, a heating platform is arranged on one side of the storage table, and the heating platform is connected to a microwave heating component. In the microwave composite heating sintering device for nano-tin-silver-copper solder paste, a microwave heating component develops a three-dimensional numerical simulation model to predict the electromagnetic field and temperature field distribution during microwave composite heating brazing with the cooperation of COMSOL software, and establishes a heating effect database for different microwave receptors, and establishes a surface model of microwave power / frequency / exposure time by response surface method, so as to predict the welding process parameters of microwave composite heating brazing and the electromagnetic field and temperature field during the welding process, thereby reducing the waste of financial and material resources in the process of process optimization to a certain extent, that is, achieving the purpose of energy saving.

Description

Technical Field

[0001] The utility model relates to the technical field of solder paste processing, in particular to a microwave composite heating sintering device for nano tin-silver-copper solder paste. Background Art

[0002] Tin-silver-copper solder paste, referred to as SAC, is a metal alloy mixed with tin (Sn), silver (Ag) and copper (Cu) in a specific proportion. Its typical proportions include SAC305 (Sn96.5Ag3.0Cu0.5), SAC405 (Sn95.5Ag4.0Cu0.5), etc. SAC not only inherits the advantages of a single metal component, such as the low melting point and excellent welding performance of tin, the high conductivity and oxidation resistance of silver, and the high strength and good thermal stability of copper, but also achieves the optimization and upgrading of comprehensive performance through the synergistic effect between elements, making it an ideal lead-free solder substitute. Nano-scale particles can reduce the welding temperature of traditional micron solder paste, thereby realizing low-temperature interconnection and high-temperature service of electronic devices. In the processing of tin-silver-copper solder paste, a sintering device is required. After searching, it is found that the sintering device in the prior art is typically such as a method for low-temperature pressureless sintering of silver nano solder paste in publication number CN110047765A. The above method realizes low-temperature pressureless sintering of silver nano solder paste according to the following steps: oxygen plasma surface activation of silver nano solder paste using plasma equipment → treatment of surface activated silver nano solder paste using formaldehyde vapor treatment device → placing the chip on the silver nano solder paste → low-temperature pressureless sintering. Its main feature is that before sintering, a two-step pretreatment method of oxygen plasma surface activation and formaldehyde vapor treatment is used to remove excess organic matter in the silver nano solder paste. Compared with untreated solder paste, low-temperature pressureless sintering can be achieved, which can prevent chip damage.

[0003] In summary, the existing sintering device is heated by an electric heating wire, which results in high heating energy consumption and low utilization of inert gas in the existing sintering device. In view of the above problems, the existing equipment needs to be improved. Utility Model Content

[0004] The purpose of the utility model is to provide a microwave composite heating sintering device for nano-tin-silver-copper solder paste, so as to solve the problem that the existing sintering device proposed in the above background technology is heated by an electric heating wire, resulting in high heating energy consumption and low inert gas utilization of the first-level existing sintering device.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a microwave composite heating sintering device for nano-tin-silver-copper solder paste, comprising a shell, a material transfer mechanism and a monitoring mechanism,

[0006] A sealing door and an equipment door are rotatably connected to the shell, and a storage table is arranged on the inner side of the sealing door, a heating table is arranged on one side of the storage table, and the heating table is connected to the microwave heating component, the material transfer mechanism is connected to the sliding sleeve, and the sliding sleeve is connected to the lead screw, and the lead screw is connected to the active rod, a cam is connected to the active rod, and one end of the active rod is connected to the hand wheel, and the hand wheel is arranged on the outside of the shell, a gas storage tank is arranged on one side wall of the shell, and the gas storage tank is connected to one end of the air pump, and the other end of the air pump is connected to the shell through a conveying pipe.

[0007] Preferably, the sealing door is arranged above the equipment door, and a pressure instrument is provided on the equipment door, and both the sealing door and the equipment door are provided with handles.

[0008] Preferably, two groups of the material transfer mechanisms are arranged opposite to each other, and the material transfer mechanisms are slidably connected to the top of the storage table and the heating table.

[0009] Preferably, the material transfer mechanism comprises a moving seat, a groove, a telescopic spring and a moving plate, and the moving seat is provided with a groove, and the groove is connected to the moving plate through the telescopic spring.

[0010] Preferably, the telescopic springs are distributed on the movable plate at equal intervals, and the movable plate is slidably connected to the inside of the groove.

[0011] Preferably, the cam is arranged on the inner side of the hand wheel, and the cam is arranged on the outer side of the sealing door.

[0012] Preferably, the delivery pipeline is connected to a first electric valve, and one end of the delivery pipeline away from the air pump is arranged to penetrate the interior of the shell.

[0013] Preferably, the monitoring mechanism is mounted on another outer wall of the housing, and the monitoring mechanism is electrically connected to the buzzer, the air pump and the first electric valve.

[0014] Preferably, the monitoring mechanism includes an exhaust pipe, a one-way valve, a second electric valve, an external exhaust pipe, an air storage tank and a concentration detector, and the exhaust pipe is connected to the shell, and the exhaust pipe is connected to the one-way valve and the concentration detector. The end of the exhaust pipe away from the shell is connected to the air storage tank through an external exhaust pipe, and the external exhaust pipe is connected to the second electric valve.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the microwave composite heating sintering device for nano-tin-silver-copper solder paste is

[0016] (1) The utility model can effectively solve the problem that the existing sintering device is heated by electric heating wire, which makes the heating energy consumption high and the inert gas utilization of the existing sintering device is low. The microwave heating component develops a three-dimensional numerical simulation model with the cooperation of COMSOL software to predict the electromagnetic field and temperature field distribution in the microwave composite heating brazing process, and establishes a heating effect database for different microwave receptors. The surface model of microwave power / frequency / exposure time is established by the response surface method, so as to predict the welding process parameters of microwave composite heating brazing and the electromagnetic field and temperature field in the welding process, thereby greatly reducing the time and financial and material resources wasted in the process of process optimization to a certain extent, that is, achieving the purpose of energy saving. In addition, the concentration detector in the monitoring mechanism can detect the concentration of the inert gas discharged to the outside, and the gas discharged through the exhaust pipe is stored in the gas storage tank. The gas inside the gas storage tank can be used for purging and dust removal before subsequent extrusion after filtering, thereby improving the utilization rate of the inert gas;

[0017] (2) The utility model can effectively solve the problem that the existing sintering device is usually placed at the center of the heating table to ensure the sintering effect, which makes it inconvenient to quickly take and put the material. The staff can squeeze the telescopic spring to place the workpiece on the inner side of the moving seat, then close the sealing door and rotate the handwheel. When the handwheel rotates, it drives the active rod to rotate, so that the sliding sleeve pushes the moving seat to drive the workpiece to move inward to the center of the heating table. Similarly, when sintering is completed, the staff can rotate the handwheel in the opposite direction, and then the two sets of sliding sleeves drive the workpiece coated with solder paste to move outward to the top of the storage table through the moving seat, thereby optimizing the material taking and putting operation of the device;

[0018] (3) The utility model can effectively solve the problem that the pressure on the sealing door increases after the internal air pressure increases, thereby easily causing the handle lock to be damaged, by using an active rod and a cam in coordination. When the handwheel rotates the active rod to drive the screw to drive the sleeve to adjust the position of the workpiece coated with solder paste, the cam rotates follower. When the workpiece coated with solder paste is located at the center of the heating table, the convex point of the cam rotates to the outside of the sealing door to support it, thereby preventing the sealing door from accidentally opening due to excessive internal pressure, thereby improving the rationality of the device structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the southwest axis side of the utility model;

[0020] Figure 2 This is a schematic diagram of the overall structure of the positional relationship between the storage table, the heating table and the material transfer mechanism of the utility model;

[0021] Figure 3 This is a schematic diagram of the southeast axis side of the utility model;

[0022] Figure 4 It is a schematic diagram of the overall structure of the connection relationship between the heating platform and the microwave heating component of the utility model;

[0023] Figure 5 For this utility model Figure 1 Enlarged structural diagram at A in the middle.

[0024] In the figure: 1. shell; 2. sealing door; 3. equipment door; 4. pressure instrument; 5. handle; 6. storage table; 7. heating table; 8. microwave heating component; 9. material transfer mechanism; 901. moving seat; 902. groove; 903. telescopic spring; 904. moving plate; 10. sliding sleeve; 11. screw; 12. active rod; 13. cam; 14. hand wheel; 15. gas storage tank; 16. air pump; 17. delivery pipeline; 18. first electric valve; 19. monitoring mechanism; 1901. exhaust pipeline; 1902. one-way valve; 1903. second electric valve; 1904. external exhaust pipeline; 1905. gas storage tank; 1906. concentration detector; 20. buzzer. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1-5 The utility model provides a technical solution: a microwave composite heating sintering device for nano-tin-silver-copper solder paste.

[0027] Embodiment 1

[0028] A sealing door 2 and an equipment door 3 are rotatably connected to the shell body 1, and a storage table 6 is arranged on the inner side of the sealing door 2, a heating table 7 is arranged on one side of the storage table 6, and the heating table 7 is connected to a microwave heating component 8, a material transfer mechanism 9 is connected to a sliding sleeve 10, and the sliding sleeve 10 is connected to a lead screw 11, and the lead screw 11 is connected to an active rod 12, a cam 13 is connected to the active rod 12, and one end of the active rod 12 is connected to a hand wheel 14, and the hand wheel 14 is arranged on the outside of the shell body 1, a gas storage tank 15 is arranged on one side wall of the shell body 1, and the gas storage tank 15 is connected to one end of an air pump 16, and the other end of the air pump 16 is connected to the shell body 1 through a conveying pipe 17.

[0029] In a further embodiment, the sealing door 2 is arranged above the equipment door 3, and a pressure meter 4 is arranged on the equipment door 3, and both the sealing door 2 and the equipment door 3 are provided with handles 5.

[0030] In a further embodiment, two sets of material transfer mechanisms 9 are arranged opposite to each other, and the material transfer mechanisms 9 are slidably connected to the top of the storage table 6 and the heating table 7 .

[0031] In a further embodiment, the material transfer mechanism 9 includes a moving seat 901 , a groove 902 , a telescopic spring 903 and a moving plate 904 , and the moving seat 901 is provided with a groove 902 , and the groove 902 is connected to the moving plate 904 through the telescopic spring 903 .

[0032] In a further embodiment, the telescopic springs 903 are evenly spaced on the movable plate 904, and the movable plate 904 is slidably connected to the inside of the groove 902. The arrangement of the telescopic springs 903 optimizes the limiting structure of the movable plate 904, thereby facilitating the expansion of the application range of the movable plate 904.

[0033] In a further embodiment, the cam 13 is arranged on the inner side of the hand wheel 14 , and the cam 13 is arranged on the outer side of the sealing door 2 .

[0034] In a further embodiment, a first electric valve 18 is connected to the delivery pipe 17 , and one end of the delivery pipe 17 away from the air pump 16 is arranged to penetrate the interior of the housing 1 .

[0035] In a further embodiment, the monitoring mechanism 19 is mounted on another outer wall of the housing 1 , and the monitoring mechanism 19 is electrically connected to the buzzer 20 , the air pump 16 and the first electric valve 18 .

[0036] In a further embodiment, the monitoring mechanism 19 includes an exhaust pipe 1901, a one-way valve 1902, a second electric valve 1903, an external exhaust pipe 1904, an air storage tank 1905 and a concentration detector 1906, and the exhaust pipe 1901 is connected to the shell 1, and the exhaust pipe 1901 is connected to the one-way valve 1902 and the concentration detector 1906. The one-way valve 1902 serves the purpose of preventing backflow, and the end of the exhaust pipe 1901 away from the shell 1 is connected to the air storage tank 1905 through the external exhaust pipe 1904, and the external exhaust pipe 1904 is connected to the second electric valve 1903.

[0037] Embodiment 2

[0038] This embodiment is a further description of the above embodiment. It should be understood that this embodiment includes all the aforementioned technical features and is further described in detail.

[0039] A microwave composite heating sintering device for nano-tin-silver-copper solder paste comprises the following operating steps:

[0040] S1: Open and place the workpiece coated with nano-tin-silver-copper solder paste on the storage table 6 inside the moving plate 904, then close the sealing door 2 and rotate the hand wheel 14, the hand wheel 14 drives the active rod 12 to rotate, so that the sliding sleeve 10 pushes the moving seat 901 to drive the workpiece to move inward to the heating table 7, and at this time the cam 13 rotates to the outside of the sealing door 2 to squeeze and seal it;

[0041] S2: Then, the power supply starter is connected, and the air pump 16 extracts the inert gas in the gas storage tank 15 and discharges it to the workpiece and the surrounding environment through the delivery pipe 17 to purge and remove dust. At the same time, the oxygen and other gases in the sealed door 2 are discharged through the exhaust pipe 1901.

[0042] S3: The concentration detector 1906 monitors the concentration of the inert gas discharged in real time. When the concentration reaches the set value, the second electric valve 1903 is controlled to close and stop the discharge. At this time, the air pressure inside the sealing door 2 gradually increases due to the addition of gas. When the pressure meter 4 detects that it reaches the set value, the buzzer 20 is controlled to sound an alarm.

[0043] S4: The microwave heating component 8 performs microwave heating on the workpiece, and the gas exhausted through the exhaust pipe 1901 is stored in the gas storage tank 1905. The gas in the gas storage tank 1905 can be used for subsequent purging and dust removal operations before extrusion after filtering.

[0044] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A microwave composite heating sintering device for nano-tin-silver-copper solder paste, comprising a housing (1), a material transfer mechanism (9) and a monitoring mechanism (19), characterized in that: The shell (1) is rotatably connected with a sealing door (2) and an equipment door (3), and a storage table (6) is arranged on the inner side of the sealing door (2). A heating table (7) is arranged on one side of the storage table (6), and the heating table (7) is connected to a microwave heating component (8). The material transfer mechanism (9) is connected to a sliding sleeve (10), and the sliding sleeve (10) is connected to a lead screw (11), and the lead screw (11) is connected to an active rod (12). A cam (13) is connected to the active rod (12), and one end of the active rod (12) is connected to a hand wheel (14), and the hand wheel (14) is arranged outside the shell (1). A gas storage tank (15) is arranged on a side wall of the shell (1), and the gas storage tank (15) is connected to one end of an air pump (16), and the other end of the air pump (16) is connected to the shell (1) through a conveying pipe (17).

2. The microwave composite heating sintering device for nano-tin-silver-copper solder paste according to claim 1, characterized in that: The sealing door (2) is arranged above the equipment door (3), and a pressure meter (4) is arranged on the equipment door (3). Meanwhile, both the sealing door (2) and the equipment door (3) are provided with handles (5).

3. The microwave composite heating sintering device for nano-tin-silver-copper solder paste according to claim 1, characterized in that: The material transfer mechanisms (9) are arranged in two groups opposite to each other, and the material transfer mechanisms (9) are slidably connected to the top of the storage table (6) and the heating table (7).

4. The microwave composite heating sintering device for nano-tin-silver-copper solder paste according to claim 1, characterized in that: The material transfer mechanism (9) comprises a moving seat (901), a groove (902), a telescopic spring (903) and a moving plate (904), wherein the moving seat (901) is provided with a groove (902), and the groove (902) is connected to the moving plate (904) via the telescopic spring (903).

5. The microwave composite heating sintering device for nano-tin-silver-copper solder paste according to claim 4, characterized in that: The telescopic springs (903) are distributed on the moving plate (904) at equal intervals, and the moving plate (904) is slidably connected inside the groove (902).

6. The microwave composite heating sintering device for nano-tin-silver-copper solder paste according to claim 1, characterized in that: The cam (13) is arranged on the inner side of the hand wheel (14), and the cam (13) is arranged on the outer side of the sealing door (2).

7. The microwave composite heating sintering device for nano-tin-silver-copper solder paste according to claim 1, characterized in that: The delivery pipeline (17) is connected to a first electric valve (18), and one end of the delivery pipeline (17) away from the air pump (16) is arranged to penetrate the interior of the housing (1).

8. The microwave composite heating sintering device for nano-tin-silver-copper solder paste according to claim 1, characterized in that: The monitoring mechanism (19) is mounted on another outer wall of the housing (1), and the monitoring mechanism (19) is electrically connected to the buzzer (20), the air pump (16) and the first electric valve (18).

9. The microwave composite heating sintering device for nano-tin-silver-copper solder paste according to claim 1, characterized in that: The monitoring mechanism (19) comprises an exhaust pipe (1901), a one-way valve (1902), a second electric valve (1903), an external exhaust pipe (1904), an air storage tank (1905) and a concentration detector (1906), wherein the exhaust pipe (1901) is connected to the housing (1), and the one-way valve (1902) and the concentration detector (1906) are connected to the exhaust pipe (1901). An end of the exhaust pipe (1901) away from the housing (1) is connected to the air storage tank (1905) via an external exhaust pipe (1904), and the external exhaust pipe (1904) is connected to the second electric valve (1903).

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