Surface mounting heating jig

Abstract

The utility model discloses a mounting heating jig, which comprises a bottom plate, a heating plate, a heating assembly, a heat insulation assembly and a lifting assembly, and is characterized in that a vacuum adsorption structure is arranged on the heating plate and is used for fixing a DBC (Direct Bonding Copper) substrate; the heating assembly is arranged below the heating plate and is used for heating the heating plate; the lifting assembly is arranged on the bottom plate and used for driving the heating plate to ascend and descend. The heat insulation assembly is arranged between the lifting assembly and the heating assembly and used for preventing heat of the heating assembly from being transmitted to the lifting assembly. According to the surface-mounting heating jig provided by the utility model, the DBC substrate can be uniformly heated during surface mounting, and the surface-mounting quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of patch technology, specifically to a patch heating fixture. Background Technology

[0002] IGBT modules are common smart power devices, formed by packaging multiple IGBT chips or multiple IGBT chips (dies) with other devices (such as power diodes) in combination (e.g., in parallel). DBC substrates are widely used in IGBT module packaging due to their advantages of low cost, good heat dissipation, and high-frequency performance. The packaging process using a DBC substrate involves first mounting multiple IGBT chips to predetermined positions on the DBC substrate, followed by soldering. During soldering, the DBC substrate is fixed using vacuum adsorption, and then heated to sinter the pre-coated silver layer onto it into a dense silver layer, thus connecting the DBC substrate and the chips. Current technology uses external heating equipment to heat the DBC substrate, resulting in high production costs and uneven heating. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, this utility model provides a mounting heating fixture that can uniformly heat the DBC substrate during mounting, thereby improving the mounting quality.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A mounting heating fixture, comprising:

[0006] Base plate;

[0007] A heating plate, wherein a vacuum adsorption structure is provided on the heating plate for fixing the DBC substrate;

[0008] A heating component is disposed below the heating plate and is used to heat the heating plate;

[0009] A lifting assembly, mounted on the base plate, is used to drive the heating plate to rise and fall;

[0010] A heat insulation component is installed between the lifting component and the heating component to prevent heat from the heating component from being transferred to the lifting component.

[0011] As a further improvement to the above technical solution, the vacuum adsorption structure includes an adsorption groove disposed on the upper surface of the heating plate and a negative pressure hole disposed inside the heating plate. One end of the negative pressure hole is connected to the adsorption groove, and the other end of the negative pressure hole is connected to a vacuum generating device.

[0012] As a further improvement to the above technical solution, the adsorption tank is an annular tank.

[0013] As a further improvement to the above technical solution, the heating component includes a heating ceramic sheet, which is in close contact with the lower surface of the heating plate.

[0014] As a further improvement to the above technical solution, the heat insulation component includes a heat insulation base, the top surface of which abuts against the bottom surface of the heating ceramic sheet.

[0015] As a further improvement to the above technical solution, the heat insulation base is provided with an installation groove, and the end of the negative pressure hole away from the adsorption groove is connected to a negative pressure pipe. The negative pressure pipe passes through the heating ceramic sheet and the heat insulation base, and the end of the negative pressure pipe is provided with a gas pipe connector, which is connected to the side wall of the installation groove.

[0016] As a further improvement to the above technical solution, the lifting assembly includes a lifting base, a cylinder, and a lifting plate. The cylinder is mounted on the base plate via the lifting base, the lifting plate is connected to the movable end of the cylinder, and the bottom of the heat insulation seat is connected to the top of the lifting plate.

[0017] As a further improvement to the above technical solution, the lifting assembly also includes a guide structure, which includes a guide base, a guide sleeve, and a guide shaft. The guide base is provided with a guide hole, the guide sleeve is fixedly connected to the guide hole, the guide shaft is slidably connected to the guide sleeve, and the top end of the guide shaft is fixedly connected to the lifting plate.

[0018] As a further improvement to the above technical solution, a limiting plate is provided on the lifting base, and a limiting protrusion is provided on the top of the limiting plate. The limiting protrusion is perpendicular to the limiting plate and the bottom of the limiting protrusion forms a horizontally arranged first limiting surface. The top of the lifting plate forms a horizontally arranged second limiting surface. When the lifting plate moves upward, the second limiting surface abuts against the first limiting surface to form a limit. The flatness of the first limiting surface and the flatness of the second limiting surface are both 5 μm.

[0019] As a further improvement to the above technical solution, the base plate is provided with multiple lifting components, and each lifting component has multiple heat insulation seats on its lifting plate. Each heat insulation seat is connected in sequence to a heating ceramic sheet and a heating plate.

[0020] The beneficial effects of this invention are as follows: By heating the heating plate with the heating ceramic sheet, the DBC substrate adsorbed and fixed on the heating plate can be evenly heated during mounting, thereby improving mounting quality. Furthermore, the heat insulation base prevents heat from the heating ceramic sheet from being transferred downwards to the lifting assembly, avoiding prolonged heating of the lifting assembly which could reduce its lifespan, and also improving heat utilization and heating effect. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is an assembly diagram of a mounting heating fixture according to an embodiment of the present invention;

[0023] Figure 2 This is an exploded view of the structure of a mounting heating fixture according to an embodiment of this utility model;

[0024] Figure 3 This is a top view of a heating plate of a mounting heating fixture according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of a heat insulation seat for a mounting heating fixture according to an embodiment of this utility model;

[0026] Figure 5 This is a schematic diagram of the lifting plate structure of a mounting heating fixture according to an embodiment of this utility model;

[0027] Figure 6 This is a cross-sectional view of a heating plate, heating ceramic sheet and heat insulation base of a mounting heating fixture according to an embodiment of this utility model;

[0028] Figure 7 This is a cross-sectional view of a mounting heating fixture along the guide axis of an embodiment of this utility model.

[0029] Reference numerals: 1. Base plate; 2. Heating plate; 21. Adsorption tank; 22. Negative pressure hole; 23. Countersunk hole; 3. Heating ceramic plate; 31. First negative pressure channel; 4. Heat insulation seat; 41. Mounting groove; 42. Air pipe connector; 43. Second negative pressure channel; 44. First connecting hole; 45. Second connecting hole; 46. Heat insulation tank; 47. Support block; 5. Lifting assembly; 51. Cylinder; 52. Lifting plate; 521. Guide shaft fixing hole; 522. Clearance opening; 523. Third connecting hole; 53. Guide base; 54. Guide shaft; 55. Guide sleeve; 56. Lifting base; 57. Limiting plate; 58. First limiting surface; 59. Second limiting surface. Detailed Implementation

[0030] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / connections involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. For example, fixed connections / fixed installations can use screw connections, bolt connections, pin connections, key connections, adhesive connections, mortise and tenon connections, welding, riveting, etc., as needed. For detachable connections, screw connections, bolt connections, threaded connections, snap-fit ​​connections, mortise and tenon connections, Velcro connections, etc., can be used as needed. The various technical features in this utility model can be combined interactively without contradicting each other.

[0031] Reference Figure 1 , Figure 2 This utility model provides a mounting heating fixture, including a base plate 1, a heating plate 2, a heating assembly, a heat insulation assembly, and a lifting assembly 5. The heating plate 2 is provided with a vacuum adsorption structure. Figure 3 and Figure 6 The vacuum adsorption structure includes an adsorption groove 21 disposed on the upper surface of the heating plate 2 and a negative pressure hole 22 disposed inside the heating plate 2. One end of the negative pressure hole 22 is connected to the adsorption groove 21, and the other end of the negative pressure hole 22 is connected to a vacuum generating device. When the DBC substrate is placed on the heating plate 2, the vacuum generating device generates a negative pressure in the adsorption groove 21, thereby adsorbing and fixing the DBC substrate on the heating plate 2.

[0032] Furthermore, the adsorption groove 21 is an annular groove, which improves the stability of DBC substrate adsorption.

[0033] In addition, the heating component is located below the heating plate 2 and is used to heat the heating plate 2, so that the DBC substrate adsorbed and fixed on the heating plate 2 can be heated evenly during mounting, thereby improving the mounting quality.

[0034] In this embodiment, the heating component includes a heating ceramic sheet 3, which has the advantages of rapid heating, uniform temperature, high thermal efficiency, good safety performance, long service life, and environmental friendliness. The heating ceramic sheet 3 is closely attached to the lower surface of the heating plate 2, thereby heating the heating plate 2 evenly and quickly.

[0035] It is understood that in some embodiments, the heating component may also use sheet-like elements such as metal heating plates or carbon fiber heating plates that convert electrical energy into heat energy.

[0036] In this embodiment, the lifting component 5 is disposed on the base plate 1 and is used to drive the heating plate 2 to rise and fall to facilitate the mounting work. In addition, the heat insulation component is disposed between the lifting component 5 and the heating component to prevent the heat of the heating component from being transferred to the lifting component 5. This can prevent the lifting component 5 from being in a heated state for a long time, which would reduce its service life, and can also improve the heat utilization rate and heating effect.

[0037] In a specific embodiment, refer to Figure 4 and Figure 6 The heat insulation component includes a heat insulation base 4, the top surface of which abuts against the bottom surface of the heating ceramic plate 3. A first negative pressure channel 31 is provided on the heating ceramic plate 3. The heat insulation base 4 is provided with an installation groove 41 and a second negative pressure channel 43 communicating with the installation groove 41. The first negative pressure channel 31, the second negative pressure channel 43 and the negative pressure hole 22 are on the same vertical axis. A negative pressure pipe is connected to the end of the negative pressure hole 22 away from the adsorption tank 21. The negative pressure pipe passes through the first negative pressure channel 31 and the second negative pressure channel 43 in sequence, and an air pipe connector 42 is provided at the end of the negative pressure pipe. The air pipe connector 42 is connected to the end of the second negative pressure channel 43 on the side wall of the installation groove 41. The air pipe connector 42 is connected to an external vacuum generator through an air pipe, thereby controlling the negative pressure at the adsorption tank 21.

[0038] It is understandable that when the upper surface of the heat insulation seat 4, the lower surface of the heating plate 2, and the upper and lower surfaces of the heating ceramic sheet 3 all have high planar accuracy, a negative pressure pipe may not be required. The diameter of the second negative pressure channel 43 is greater than the diameter of the first negative pressure channel 31, which is greater than the diameter of the negative pressure hole 22. The air pipe connector 42 is connected to the end of the second negative pressure channel 43. Negative pressure can be transmitted even without a negative pressure pipe.

[0039] In a preferred embodiment, refer to Figure 4 The top of the heat insulation base 4 is provided with a heat insulation groove 46. When the heating ceramic sheet 3 abuts against the top of the heat insulation base 4, a closed cavity is formed, which can further improve the heat insulation effect. A support block 47 is provided in the heat insulation groove 46. The surface of the support block 47 is flush with the surface of the heat insulation base 4 to support the heating ceramic sheet 3.

[0040] In a specific embodiment, refer to Figure 2 and Figure 7The lifting assembly 5 includes a lifting base 56, a cylinder 51, and a lifting plate 52. The cylinder 51 is mounted on the base plate 1 via the lifting base 56. The extension and retraction direction of the cylinder 51 is vertical. The lifting plate 52 is connected to the movable end of the cylinder 51 and is horizontally positioned. The bottom of the heat insulation seat 4 is connected to the top of the lifting plate 52. Thus, when the cylinder 51 extends and retracts, it drives the heat insulation seat 4 and the heating plate 2 to rise and fall, facilitating the mounting work.

[0041] Furthermore, the lifting assembly 5 also includes a guide structure, which includes a guide base 53, two sets of guide sleeves 55, and a guide shaft 54. The two sets of guide sleeves 55 and the guide shaft 54 ​​are symmetrically arranged on both sides of the cylinder 51. A guide hole is provided on both sides of the guide base 53. The two guide sleeves 55 are respectively fixedly connected to the two guide holes. The guide shaft 54 ​​is slidably connected to the guide sleeves 55. The top end of the guide shaft 54 ​​is fixedly connected to the lifting plate 52. Thus, when the cylinder 51 drives the lifting plate 52 to rise and fall, the stability of the lifting plate 52 is improved by the guide structure.

[0042] In a preferred embodiment, refer to Figure 1 and Figure 2 The base plate 1 is provided with two lifting components 5. Each lifting component 5 has four heat insulation seats 4 on its lifting plate 52. Each heat insulation seat 4 is connected in sequence with a heating ceramic sheet 3 and a heating plate 2. That is, the mounting heating fixture of this utility model has eight heating plates 2, which can perform mounting work on eight DBC substrates at the same time, thereby improving production efficiency.

[0043] Furthermore, refer to Figure 7 The lifting base 56 is provided with a limiting plate 57. The top of the limiting plate 57 is provided with a limiting protrusion. The limiting protrusion is perpendicular to the limiting plate 57 and the bottom of the limiting protrusion forms a horizontally arranged first limiting surface 58. The top of the lifting plate 52 forms a horizontally arranged second limiting surface 59. When the lifting plate 52 moves upward, the second limiting surface 59 abuts against the first limiting surface 58 to form a limit. The flatness of the first limiting surface 58 and the flatness of the second limiting surface 59 are both 5um. With this setting, when the cylinder 51 drives the lifting plate 52 to move upward to the DBC substrate on the heating plate 2 to a specified height, the second limiting surface 59 contacts the first limiting surface 58, thereby ensuring the flatness of the DBC substrate.

[0044] It is understood that in this embodiment, the heating plate 2 is fixed to the heat insulation base 4 by bolts. Specifically, refer to... Figure 3 and Figure 4The heating plate 2 is provided with a countersunk hole 23, the heat insulation seat 4 is provided with a first connecting hole 44, and the side of the heating ceramic sheet 3 is provided with a U-shaped groove. The bolt passes through the countersunk hole 23 and the U-shaped groove and is connected to the first connecting hole 44, thereby fixing the heating ceramic sheet 3 and the heating plate 2 on the heat insulation seat 4.

[0045] Additionally, refer to Figure 4 and Figure 5 The heat insulation base 4 is also provided with a second connecting hole 45, and the lifting plate 52 is provided with a third connecting hole 523. The heat insulation base 4 and the lifting plate 52 are fixedly connected by bolts passing through the second connecting hole 45 and the third connecting hole 523 in sequence. The lifting plate 52 is also provided with a guide shaft fixing hole 521, and the guide shaft 54 ​​is fixed to the guide shaft fixing hole 521 and further locked by screws.

[0046] Reference Figure 5 The lifting plate 52 is provided with a clearance opening 522, and the air pipe passes through the clearance opening 522 to connect with an external vacuum generating device, so that the mounting heating fixture has a reasonable structural layout.

[0047] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A mounting heating fixture, characterized in that, include: Base plate; A heating plate, wherein a vacuum adsorption structure is provided on the heating plate for fixing the DBC substrate; A heating component is disposed below the heating plate and is used to heat the heating plate; A lifting assembly, mounted on the base plate, is used to drive the heating plate to rise and fall; A heat insulation component is installed between the lifting component and the heating component to prevent heat from the heating component from being transferred to the lifting component.

2. The mounting heating fixture according to claim 1, characterized in that: The vacuum adsorption structure includes an adsorption groove disposed on the upper surface of the heating plate and a negative pressure hole disposed inside the heating plate. One end of the negative pressure hole is connected to the adsorption groove, and the other end of the negative pressure hole is connected to a vacuum generating device.

3. The mounting heating fixture according to claim 2, characterized in that: The adsorption tank is an annular tank.

4. The mounting heating fixture according to claim 2, characterized in that: The heating component includes a heating ceramic plate that is in close contact with the lower surface of the heating plate.

5. A mounting heating fixture according to claim 4, characterized in that: The heat insulation component includes a heat insulation base, the top surface of which abuts against the bottom surface of the heating ceramic sheet.

6. A mounting heating fixture according to claim 5, characterized in that: The heat insulation base is provided with an installation groove. The end of the negative pressure hole away from the adsorption groove is connected to a negative pressure pipe. The negative pressure pipe passes through the heating ceramic sheet and the heat insulation base, and the end of the negative pressure pipe is provided with a gas pipe connector, which is connected to the side wall of the installation groove.

7. A mounting heating fixture according to claim 5, characterized in that: The lifting assembly includes a lifting base, a cylinder, and a lifting plate. The cylinder is mounted on the base plate via the lifting base, the lifting plate is connected to the movable end of the cylinder, and the bottom of the heat insulation seat is connected to the top of the lifting plate.

8. A mounting heating fixture according to claim 7, characterized in that: The lifting assembly also includes a guide structure, which includes a guide base, a guide sleeve, and a guide shaft. The guide base has a guide hole, the guide sleeve is fixedly connected to the guide hole, the guide shaft is slidably connected to the guide sleeve, and the top end of the guide shaft is fixedly connected to the lifting plate.

9. A mounting heating fixture according to claim 7, characterized in that: The lifting base is provided with a limiting plate, the top of the limiting plate is provided with a limiting protrusion, the limiting protrusion is perpendicular to the limiting plate and the bottom of the limiting protrusion forms a horizontally arranged first limiting surface, the top of the lifting plate forms a horizontally arranged second limiting surface, when the lifting plate moves upward, the second limiting surface abuts against the first limiting surface to form a limit, and the flatness of the first limiting surface and the flatness of the second limiting surface are both 5um.

10. A mounting heating fixture according to claim 9, characterized in that: The base plate is provided with multiple lifting components, and each lifting component has multiple heat insulation seats on its lifting plate. Each heat insulation seat is connected in sequence to a heating ceramic sheet and a heating plate.

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