Sintering and welding multifunctional device for power module

Abstract

The utility model discloses a sintering and welding multifunctional device for a power module, which comprises a vacuum cavity provided with a door assembly. A hot-pressing assembly and a cold-pressing assembly are arranged above the vacuum cavity, and a hot-pressing base matched with the hot-pressing assembly and a cooling base matched with the cold-pressing assembly are arranged below the vacuum cavity; a servo press is further arranged below the vacuum cavity and used for applying force to the hot-pressing base and the cooling base. A closed space is provided through the vacuum cavity, reducing gas can be filled into the cavity for reduction, it is guaranteed that products are not oxidized in the process from sintering or welding to cooling, and sintering and welding quality is guaranteed; pressure is applied in the cooling process, so that the problem that the product is easy to deform in the cooling process is solved; the pressure value is monitored in real time through the pressure sensor, and compared with traditional air pressure conversion, the device is more visual, faster in response and higher in precision; the concentration values of various gases can be monitored in real time, and more diversified process control capabilities can be realized.

Description

Technical Field

[0001] This utility model relates to the field of power module manufacturing technology, specifically a multifunctional device for sintering and welding power modules. Background Technology

[0002] In the existing technology, the power module is sintered by filling the sintering chamber with nitrogen to maintain positive pressure and prevent oxygen from entering and oxidizing the product. During the process of entering the cooling chamber from the sintering chamber, the product enters the atmospheric environment without being cooled, which leads to oxidation. During the cooling process, no pressure is applied to the product, which causes the product to deform. Summary of the Invention

[0003] Purpose of the utility model: To solve the above-mentioned technical problems, this utility model provides a multi-functional device for sintering and welding power modules.

[0004] Technical Solution: This utility model discloses a multifunctional sintering and welding device for power modules, comprising a vacuum chamber, on which a door assembly is disposed; a hot pressing assembly and a cold pressing assembly are disposed above the vacuum chamber, and a hot pressing base cooperating with the hot pressing assembly and a cooling base cooperating with the cold pressing assembly are disposed below the vacuum chamber; a servo press is also disposed below the vacuum chamber, the servo press being used to apply force to the hot pressing base and the cooling base; and a gear conveyor belt is disposed inside the vacuum chamber.

[0005] Furthermore, the hot pressing assembly includes a hot pressing head located inside the vacuum chamber, and a demolding mechanism installed on the side wall of the hot pressing head. A heat insulation plate and a cooling block are installed above the hot pressing head. Cooling water pipes are provided on both sides of the cooling block. Multiple guide shafts are provided above the cooling block. The guide shafts pass upward through the vacuum chamber and are connected to the cooling block located outside the vacuum chamber.

[0006] Furthermore, the hot press base includes a hot press base plate located inside the vacuum chamber, a second heat insulation plate, a first support plate, and a second cooling water pipe connected to the first support plate; multiple second guide shafts are installed below the first support plate; the second guide shafts extend downward out of the vacuum chamber and are connected to a first top block located outside the vacuum chamber; a second cooling block is provided in the middle of the second guide shaft, and the first top block is connected to a servo press.

[0007] Furthermore, the cold pressing assembly includes a cold pressing head located in the vacuum chamber, and a demolding mechanism II installed on the side wall of the cold pressing head. A cooling block is installed above the cold pressing head, and cooling water pipes III are provided on both sides of the cooling block. Multiple guide shafts III are provided above the cooling block. The guide shafts III extend upward out of the vacuum chamber, and a cooling block III is provided above the guide shafts III.

[0008] Furthermore, the cooling base includes a cold-pressing base plate located inside the vacuum chamber, a blocking mechanism, a support plate 2, and a cooling water pipe 4 connected to the support plate 2. Multiple guide shafts 4 are arranged below the support plate 2. The guide shafts 4 extend out of the vacuum chamber. A cooling block 4 is provided in the middle of the guide shaft 4. A top block 2 is installed at the bottom end of the guide shaft 4. The top block 2 is connected to the servo press.

[0009] Furthermore, it also includes a feeding mechanism, which comprises a conveyor belt and a lifting mechanism.

[0010] Furthermore, the door assembly includes a cavity door and a valve disposed on the cavity door.

[0011] Furthermore, a gear conveyor belt is installed inside the vacuum chamber.

[0012] Furthermore, a partition is provided inside the vacuum chamber.

[0013] Furthermore, cooling water channels are provided inside the walls of the vacuum chamber and the chamber door.

[0014] Beneficial effects: Compared with the prior art, this utility model has the following beneficial effects:

[0015] 1. The vacuum chamber provides a sealed space, and reducing gas can be introduced into the chamber for reduction, ensuring that the product is free from oxidation before sintering or welding and during the cooling process, thus guaranteeing the quality of sintering and welding.

[0016] 2. By applying pressure during the cooling process, the problem of product deformation during cooling was solved;

[0017] 3. Real-time pressure monitoring via pressure sensors is more intuitive, faster-responding, and more accurate than traditional air pressure conversion methods;

[0018] 4. It can monitor the concentration of various gases in real time, enabling more diverse process control capabilities. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 for Figure 1 A schematic diagram of the side view structure;

[0021] Figure 3 This is a schematic diagram of the vacuum cavity structure;

[0022] Figure 4 This is a schematic diagram of the hot-pressing assembly structure;

[0023] Figure 5 This is a schematic diagram of the hot-press base structure;

[0024] Figure 6 This is a schematic diagram of the cold-pressing assembly structure;

[0025] Figure 7 This is a schematic diagram of the cooling base structure;

[0026] Figure 8 This is a schematic diagram of the feeding mechanism. Detailed Implementation

[0027] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0028] like Figure 1-8 As shown, this utility model discloses a multifunctional sintering and welding device for power modules, including a vacuum chamber 1. A door assembly is provided on the vacuum chamber 1, comprising a door 12 and a valve 13 mounted on the door 12. The valve 13 is driven by a cylinder to allow material to enter and exit. A hot pressing assembly 2 and a cold pressing assembly 4 are arranged above the vacuum chamber 1. A hot pressing base 3, which cooperates with the hot pressing assembly 2, and a cooling base 5, which cooperates with the cold pressing assembly 4, are arranged below the vacuum chamber 1. A servo press 7 is also arranged below the vacuum chamber 1, which applies force to the hot pressing base 3 and the cooling base 5. It also includes a feeding mechanism 6, which comprises a conveyor belt 61 and a lifting mechanism 62, as shown... Figure 8 As shown, the lifting mechanism 62 includes a cylinder 621 and a set of guide rods 622. When the cylinder 621 is working, it lifts the conveyor belt 61 to move upward, and the guide rods 622 are used for guidance.

[0029] like Figure 4 As shown, the hot pressing assembly 2 includes a hot pressing head 21 located inside the vacuum chamber 1, and a demolding mechanism 22 installed on the side wall of the hot pressing head 21. A heat insulation plate 23 and a cooling block 24 are installed above the hot pressing head 21. Cooling water pipes 25 are provided on both sides of the cooling block 24. Multiple guide shafts 26 are provided above the cooling block 24. The guide shafts 26 pass upward through the vacuum chamber 1 and are connected to the cooling block 27 located outside the vacuum chamber 1. The cooling block 27 is used to cool the guide shafts 26.

[0030] like Figure 5 As shown, the hot press base 3 includes a hot press base plate 31, a heat insulation plate 32, a support plate 33 located inside the vacuum chamber 1, and a cooling water pipe 34 connected to the support plate 33; multiple guide shafts 35 are installed below the support plate 33; the guide shafts 35 extend downward out of the vacuum chamber 1 and are connected to a top block 37 located outside the vacuum chamber 1; a cooling block 36 is provided in the middle of the guide shaft 35, and the cooling block 36 is used to cool the guide shaft 35; the top block 37 is connected to the servo press 7.

[0031] like Figure 6As shown, the cold pressing assembly 4 includes a cold pressing head 41 located in the vacuum chamber 1, and a demolding mechanism 42 installed on the side wall of the cold pressing head 41. A cooling block 43 is installed above the cold pressing head 41, and cooling water pipes 44 are provided on both sides of the cooling block 43. Multiple guide shafts 45 are provided above the cooling block. The guide shafts 45 extend upward out of the vacuum chamber 1, and a cooling block 46 is provided above the guide shafts 45. The cooling block 46 is used to cool the guide shafts 45.

[0032] like Figure 7 As shown, the cooling base 5 includes a cold-pressing base plate 51, a blocking mechanism 52, a support plate 53 located inside the vacuum chamber 1, and a cooling water pipe 54 connected to the support plate 53. Multiple guide shafts 55 are arranged below the support plate 53. Each guide shaft 55 extends out of the vacuum chamber 1, and a cooling block 56 is provided in the middle of each guide shaft 55 for cooling the guide shaft 55. A top block 57 is installed at the bottom end of each guide shaft 55, and the top block 57 is connected to the servo press 7.

[0033] like Figure 1-3 As shown, a partition 16 is provided inside the vacuum chamber 1. The vacuum chamber 1, together with the hot pressing assembly 2, the hot pressing base 3, and the servo press 7, constitutes a sintering and welding unit. The vacuum chamber 1, together with the cold pressing assembly 2, the cold pressing base 3, and the servo press 7, constitutes a cooling unit. The partition 16 separates the sintering and welding unit and the cooling unit, thus forming two functional areas within the vacuum chamber 1. The partition 16 can be driven by a cylinder to move up and down within the vacuum chamber 1, which can be used to reduce heat loss during hot pressing.

[0034] like Figure 3 As shown, cooling water channels are provided inside the walls of the cavity 11 and the cavity door 12 of the vacuum cavity 1 for cooling the side walls of the vacuum cavity 1.

[0035] like Figure 4 and Figure 6 As shown, a spring 28 and a pressure sensor 29 can be installed inside the hot pressing assembly 2 to monitor the actual pressure value of each product in real time. Similarly, a spring 47 and a pressure sensor 48 are installed inside the cold pressing assembly 2 to monitor the actual pressure value of each product in real time. Springs 28 and 47 can also be used to address the problem of inconsistent pressure caused by height differences between products.

[0036] like Figure 3 As shown, the upper and lower outer walls of the vacuum chamber 1 are provided with guide shaft channels 15, and sealing rings are provided inside the guide shaft channels 15 for sealing. The guide shaft channels 15 are used for guide shaft one 26, guide shaft two 35, guide shaft three 45, and guide shaft four 55 to pass through.

[0037] like Figure 1-3As shown, gear conveyor belts 14 can also be installed on both sides of the inner wall of the vacuum chamber 1. The gear conveyor belts 14 are driven by a servo motor installed outside the chamber 11. A magnetohydrodynamic seal is provided between the servo motor and the chamber 11 to ensure airtightness.

[0038] Figure 4 The film removal mechanism 22 and Figure 6 In the second demolding mechanism 42, a film is applied to the product surface. After hot pressing or cooling, the film may be carried away by the hot or cold pressing head. The first demolding mechanism 22 and the demolding mechanism 42 can respectively press the film when the hot pressing head 21 and the cold pressing head 41 are raised. The structure of the demolding mechanism 22 can be as follows: Figure 4 As shown, it includes a mounting base 221 disposed on the hot press head 21. A set of shafts 222 are disposed on the mounting base 221. A pressure plate 223 is disposed at the lower end of the shafts 222. The upper end of the shafts 222 is disposed inside the mounting base 221. A spring is disposed inside the mounting base 221 to apply elastic force to the shafts 222 for demolding. The demolding mechanism 42 has the same structure as the demolding mechanism 22.

[0039] In addition, the heat of the hot pressing assembly 2 and the hot pressing base 3 is achieved by heating rods; the cooling water of the cold pressing assembly 4 and the cooling base 5 is provided by an external chiller; and the sintering, welding pressure and cooling pressure can be provided by two sets of servo presses respectively.

[0040] The working process of this utility model is as follows:

[0041] First, the carrier loaded with the product is placed into the feeding mechanism 6. The feeding mechanism 6 automatically feeds the carrier to the valve 13 in front of the vacuum chamber 1. The valve 13 opens automatically, the carrier enters the vacuum chamber 1, and the valve 13 closes.

[0042] Vacuum chamber 1 is evacuated. Once the vacuum reaches the set value, nitrogen is introduced. Once the nitrogen reaches the set value, vacuum is evacuated again. Once the vacuum reaches the set value again, reducing gas is introduced. Once the gas concentration reaches the set value, the carrier flows into the sintering and welding area. The servo press 7 then starts working, lifting the product a certain distance to preheat it. After the set time is reached, the servo press 7 continues to lift the product and contacts the hot pressing assembly 2. Once the set pressure value is reached, the pressure is maintained.

[0043] After the set time is reached, the servo press 7 is retracted, and the carrier flows into the cooling area through the gear conveyor belt 14. The servo press 7 then starts working, lifting upwards and contacting the cold pressing component 4. After reaching the set pressure value, it is held to begin cooling the product.

[0044] After the set time is reached, the servo press 7 is retracted, and the vacuum chamber 1 begins to be evacuated. After the vacuum reaches the set value, nitrogen is introduced. After the nitrogen reaches the set value, the valve 13 is opened, the carrier flows out of the vacuum chamber 1, enters the feeding mechanism, and is then sent out of the device, completing the entire cycle.

[0045] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sintering welding multi-functional device for a power module, characterized by: The system includes a vacuum chamber (1) on which a door assembly is provided; a hot pressing assembly (2) and a cold pressing assembly (4) are provided above the vacuum chamber (1); a hot pressing base (3) that cooperates with the hot pressing assembly (2) and a cooling base (5) that cooperates with the cold pressing assembly (4) are provided below the vacuum chamber (1); a servo press (7) is also provided below the vacuum chamber (1), which is used to apply force to the hot pressing base (3) and the cooling base (5); and a gear conveyor belt (14) is provided inside the vacuum chamber (1).

2. A sintering welding multi-functional device for power modules according to claim 1, characterized in that: The hot pressing assembly (2) includes a hot pressing head (21) located inside the vacuum chamber (1) and a demolding mechanism (22) installed on the side wall of the hot pressing head (21). A heat insulation plate (23) and a cooling block (24) are installed above the hot pressing head (21). Cooling water pipes (25) are provided on both sides of the cooling block (24). Multiple guide shafts (26) are provided above the cooling block (24). The guide shafts (26) pass upward through the vacuum chamber (1) and are connected to the cooling block (27) located outside the vacuum chamber (1).

3. The sintering and welding multi-functional device for power modules according to claim 1, characterized in that: The hot press base (3) includes a hot press base plate (31), a heat insulation plate (32), a support plate (33) located inside the vacuum chamber (1), and a cooling water pipe (34) connected to the support plate (33); multiple guide shafts (35) are installed below the support plate (33); the guide shafts (35) extend downward through the vacuum chamber (1) and are connected to a top block (37) located outside the vacuum chamber (1); a cooling block (36) is provided in the middle of the guide shafts (35), and the top block (37) is connected to the servo press (7).

4. A sintering welding multi-functional device for power modules according to claim 1, characterized in that: The cold pressing assembly (4) includes a cold pressing head (41) located in the vacuum chamber (1) and a demolding mechanism (42) installed on the side wall of the cold pressing head (41). A cooling block (43) is installed above the cold pressing head (41). Cooling water pipes (44) are provided on both sides of the cooling block (43). Multiple guide shafts (45) are provided above the cooling block. The guide shafts (45) extend upward out of the vacuum chamber (1). A cooling block (46) is provided above the guide shafts (45).

5. A sintering welding multi-functional device for power modules according to claim 1, characterized in that: The cooling base (5) includes a cold pressing base plate (51), a blocking mechanism (52), a support plate (53) located inside the vacuum chamber (1), and a cooling water pipe (54) connected to the support plate (53). Multiple guide shafts (55) are provided below the support plate (53). The guide shafts (55) extend out of the vacuum chamber (1). A cooling block (56) is provided in the middle of the guide shafts (55). A top block (57) is installed at the bottom of the guide shafts (55). The top block (57) is connected to the servo press (7).

6. A sintering welding multi-functional device for power modules according to claim 1, characterized in that: It also includes a feeding mechanism (6), which includes a conveyor belt (61) and a lifting mechanism (62).

7. The sintering welding multi-functional device for power modules according to claim 1, characterized in that: The door assembly includes a cavity door (12) and a valve (13) disposed on the cavity door (12).

8. The sintering welding multi-functional device for power modules according to claim 1, characterized in that: A gear conveyor belt (14) is installed inside the vacuum chamber (1).

9. The sintering welding multi-functional device for power modules according to claim 1, characterized in that: The vacuum cavity (1) is internally provided with a partition plate (16).

10. The sintering welding multi-functional device for power modules according to claim 1, characterized in that: The wall of the vacuum cavity (1) and the cavity door (12) is internally provided with a cooling water channel.

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