Welding fixture and welding assembly

Abstract

The application provides a welding tool and a welding assembly. The welding tool comprises a limiting frame and a heat transfer base arranged in sequence along the direction of gravity, a radiator is arranged between the limiting frame and the heat transfer base, the heat transfer base is used for transferring heat to the radiator, and the limiting frame is used for limiting the radiator in the length direction and / or the width direction of the welding tool. The welding tool further comprises a first fixing member and a second fixing member. One end of the first fixing member penetrates through the limiting frame, the radiator and the heat transfer base and is detachably connected with the second fixing member, so that the limiting frame, the radiator and the heat transfer base are fixedly connected. The first fixing member and the second fixing member can be connected with each other, one end of the first fixing member penetrates through the limiting frame, the radiator and the heat transfer base, the contact area between the radiator and the heat transfer base is increased, the heat transfer efficiency and the heat transfer uniformity of the welding tool are improved, and the welding success rate is further improved.

Description

Technical Field

[0001] This application relates to the field of welding tooling technology, and more particularly to a welding tooling and welding assembly. Background Technology

[0002] Formic acid reflow soldering is a widely used soldering process in electronic packaging, power module assembly, and other fields. It achieves high-quality soldering between components and substrates by heating in an inert or formic acid atmosphere. In this process, soldering fixtures are used to fix the components to be soldered (such as power semiconductor devices), heat sinks, and heat transfer bases to ensure stable positioning and uniform heat transfer during the heating process.

[0003] Traditional welding fixtures typically consist of a single-tube positioning frame, a heat sink, and a heat transfer base arranged sequentially from top to bottom. The single-tube positioning frame is primarily used to position the power device in the X and Y directions, while the heat sink and heat transfer base are assembled in the Z direction solely by gravity stacking, lacking an effective clamping mechanism. This structure has significant drawbacks in practical applications: when the heat sink itself has incoming material warping or poor flatness, the actual contact area between it and the heat transfer base will be significantly reduced, leading to increased local thermal resistance and decreased heat transfer efficiency. During formic acid reflow soldering, heat is mainly transferred upwards through the bottom heating platform and the heat transfer base. If the fit is not tight, it will cause uneven temperature distribution on the heat sink surface, resulting in large temperature gradients in the welding area, inconsistent solder wetting, and quality problems such as incomplete or cold solder joints, which can even lead to product scrap in severe cases.

[0004] Therefore, there is an urgent need for a welding fixture structure that can effectively increase the contact area between the radiator and the heat transfer base, enhance the heat transfer uniformity, and improve welding consistency and yield. Utility Model Content

[0005] This application provides a welding fixture and welding assembly to solve the problem that existing welding fixtures lack an effective clamping mechanism between the heat sink and the heat transfer base in the Z direction, which leads to a significant reduction in the actual contact area between the heat transfer base and the heat sink, resulting in increased local thermal resistance and decreased heat transfer efficiency.

[0006] In a first aspect, embodiments of this application provide a welding fixture, including a limiting frame and a heat transfer base arranged sequentially along the direction of gravity. A heat sink is placed between the limiting frame and the heat transfer base, and the heat transfer base is used to transfer heat to the heat sink. The limiting frame is used to limit the heat sink in the length and / or width direction of the welding fixture. The welding fixture also includes a first fixing member and a second fixing member. One end of the first fixing member passes through the limiting frame, the heat sink, and the heat transfer base and is detachably connected to the second fixing member, so that the limiting frame, the heat sink, and the heat transfer base are fixedly connected.

[0007] In one embodiment, a receiving groove is provided at the bottom of the heat transfer base along the direction of gravity, and the second fixing member is installed in the receiving groove.

[0008] In one embodiment, when the second fastener is installed in the receiving groove, the outer side of the second fastener is interference-fitted with the side wall of the receiving groove.

[0009] In one embodiment, the heat transfer base has a mounting hole on its side wall, the mounting hole communicating with the receiving groove, and the second fixing member can be installed in the receiving groove along the direction from the mounting hole to the receiving groove.

[0010] In one embodiment, along the direction from the mounting hole to the receiving groove, the projection of the second fastener on the heat transfer base is located within the receiving groove.

[0011] In one embodiment, the first fixing member and the second fixing member are screwed together.

[0012] In one embodiment, the first fixing member is a bolt, and the limiting frame has a bolt hole corresponding to the first fixing member. The first fixing member passes through the bolt hole and is screwed into the limiting frame.

[0013] In one embodiment, the head of the first fastener is located at the top of the limiting frame along the direction of gravity.

[0014] In one embodiment, there are multiple first and second fasteners, and each first and second fastener is combined to form a fastening device. The multiple fastening devices are spaced apart around the circumference of the welding fixture.

[0015] Secondly, embodiments of this application also provide a welding assembly, comprising: The welding fixture mentioned in any of the above embodiments; A radiator, along the direction of gravity, is disposed between the limiting frame and the heat transfer base; A welded component, which is disposed on the radiator, and the limiting frame is used to limit the welded component in the length direction and / or width direction of the welding fixture.

[0016] The welding fixture provided in this application includes a limiting frame and a heat transfer base arranged sequentially along the direction of gravity. A heat sink is placed between the limiting frame and the heat transfer base. The heat transfer base is used to transfer heat to the heat sink, and the heat sink is used to transfer heat to the weldment to achieve the purpose of welding the weldment. The limiting frame is used to limit the heat sink in the length and / or width direction of the welding fixture. The welding fixture also includes a first fixing member and a second fixing member. One end of the first fixing member passes through the limiting frame, the heat sink and the heat transfer base and is detachably connected to the second fixing member so that the limiting frame, the heat sink and the heat transfer base are fixedly connected.

[0017] In this application, by setting a first fixing member and a second fixing member that can be connected to each other, and by passing a limiting frame, a heat sink, and a heat transfer base through one end of the first fixing member, and by fixing the first fixing member and the second fixing member after passing through, the limiting frame, the heat sink, and the heat transfer base can be tightly fixed and pressed by the first fixing member and the second fixing member in the direction of gravity (i.e., the Z direction), thereby increasing the contact area between the heat sink and the heat transfer base, thereby enhancing the heat transfer efficiency and heat transfer uniformity of the welding fixture, and thus improving the welding performance. At the same time, in this application, since the limiting frame, the heat sink, and the heat transfer base can be tightly fixed and pressed by the first fixing member and the second fixing member, the limiting effect of the limiting frame on the heat sink can also be effectively improved, so as to avoid the heat sink from loosening during the welding process, and further improve the welding success rate and efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the welding fixture provided in the embodiments of this application.

[0020] Figure 2 This is a schematic diagram of the overall structure of the welding fixture provided in an embodiment of this application from another perspective.

[0021] Figure 3 for Figure 2 The diagram shows a cross-sectional view of the welding fixture along the AA direction.

[0022] Figure 4This is a schematic diagram of the overall structure of the welding fixture provided in another embodiment of this application.

[0023] Explanation of reference numerals in the attached figures: 100. Welding fixtures; 110. Limiting frame; 111. Bolt holes; 130. Heat transfer base; 131. Receiving groove; 132. Mounting hole; 140. Fixing device; 141. First fixing member; 142. Second fixing member; 210. Radiator. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0025] Formic acid reflow soldering is a widely used soldering process in electronic packaging, power module assembly, and other fields. It achieves high-quality soldering between components and substrates by heating in an inert or formic acid atmosphere. In this process, soldering fixtures are used to fix the components to be soldered (such as power semiconductor devices), heat sinks, and heat transfer bases to ensure stable positioning and uniform heat transfer during the heating process.

[0026] Traditional welding fixtures typically consist of a single-tube positioning frame, a heat sink, and a heat transfer base arranged sequentially from top to bottom. The single-tube positioning frame is primarily used to position the power device in the X and Y directions, while the heat sink and heat transfer base are assembled in the Z direction solely by gravity stacking, lacking an effective clamping mechanism. This structure has significant drawbacks in practical applications: when the heat sink itself has incoming material warping or poor flatness, the actual contact area between it and the heat transfer base will be significantly reduced, leading to increased local thermal resistance and decreased heat transfer efficiency. During formic acid reflow soldering, heat is mainly transferred upwards through the bottom heating platform and the heat transfer base. If the fit is not tight, it will cause uneven temperature distribution on the heat sink surface, resulting in large temperature gradients in the welding area, inconsistent solder wetting, and quality problems such as incomplete or cold solder joints, which can even lead to product scrap in severe cases.

[0027] Based on the above-mentioned technical problems, this application provides a welding fixture 100. Please refer to [link / reference]. Figures 1-3The welding fixture 100 provided in this embodiment includes a limiting frame 110 and a heat transfer base 130 arranged sequentially along the direction of gravity. A heat sink 210 is placed between the limiting frame 110 and the heat transfer base 130. The heat transfer base 130 is used to transfer heat to the heat sink 210, and the heat sink 210 is used to transfer heat to the weldment (not shown) to achieve the welding purpose. The limiting frame 110 is used to limit the heat sink 210 in the length and / or width direction of the welding fixture 100. Please continue to refer to... Figures 1-3 In this embodiment, the welding fixture 100 further includes a first fixing member 141 and a second fixing member 142. One end of the first fixing member 141 passes through the limiting frame 110, the radiator 210 and the heat transfer base 130 and is detachably connected to the second fixing member 142 so that the limiting frame 110, the radiator 210 and the heat transfer base 130 are fixedly connected.

[0028] It is understood that in this embodiment, by providing a first fixing member 141 and a second fixing member 142 that can be connected to each other, and by having one end of the first fixing member 141 pass through the limiting frame 110, the radiator 210, and the heat transfer base 130, and by fixing the first fixing member 141 and the second fixing member 142 after passing through, the limiting frame 110, the radiator 210, and the heat transfer base 130 can be tightly fixed and pressed by the first fixing member 141 and the second fixing member 142 in the direction of gravity (i.e., the Z direction), thereby enhancing the heat dissipation. The contact area between the heat sink 210 and the heat transfer base 130 is increased, thereby enhancing the heat transfer efficiency and uniformity of the welding fixture 100 to improve welding performance. At the same time, in this embodiment, since the limiting frame 110, the heat sink 210 and the heat transfer base 130 can be tightly fixed and pressed by the first fixing member 141 and the second fixing member 142, the limiting effect of the limiting frame 110 on the heat sink 210 can also be effectively improved, so as to avoid the heat sink 210 from becoming loose during the welding process, and further improve the welding success rate and efficiency.

[0029] It should be noted that the welding fixture 100 provided in this embodiment can be applied to the formic acid reflow soldering process.

[0030] In some embodiments, such as Figure 1 and Figure 4 As shown, along the direction of gravity, the bottom of the heat transfer base 130 is provided with a receiving groove 131. After the first fixing member 141 is connected to the second fixing member 142, the second fixing member 142 is installed in the receiving groove 131. It can be understood that by setting the receiving groove 131 to accommodate the second fixing member 142, the length of the second fixing member 142 protruding from the bottom of the heat transfer base 130 can be effectively reduced after the first fixing member 141 and the second fixing member 142 are connected, so as to optimize the overall size of the welding fixture 100.

[0031] For further information, please refer to [link / reference]. Figure 1 and Figure 4 The heat transfer base 130 has a mounting hole 132 on its side wall, which communicates with the receiving groove 131. Simultaneously, the second fixing member 142 can be installed in the receiving groove 131 along the direction from the mounting hole 132 to the receiving groove 131. When the welding fixture 100 is needed, the heat transfer base 130 must be placed first, followed by the radiator 210 and the limiting frame 110 stacked sequentially along the direction of gravity, with the three components fixed by the first fixing member 141 and the second fixing member 142. Then, the workpiece to be welded is placed on the radiator 210 and limited by the limiting frame 110. In this embodiment, by providing a mounting hole 132 on the side wall of the heat transfer base 130, the second fixing member 142 can be installed from the side after placing the heat transfer base 130, the radiator 210, and the limiting frame 110, thus simplifying the assembly of the welding fixture 100 and improving assembly efficiency.

[0032] It is understood that in the above embodiments, as Figure 1 and Figure 4 As shown, along the direction from the mounting hole 132 to the receiving groove 131 (i.e., the direction of the side wall of the heat transfer base 130), the projection of the second fixing member 142 on the heat transfer base 130 is located in the receiving groove 131. This allows the second fixing member 142 to be accommodated in the bottom of the heat transfer base 130 after the first fixing member 141 and the second fixing member 142 are connected, so that the second fixing member 142 no longer protrudes from the bottom of the heat transfer base 130, thereby allowing the heat transfer base 130 to be placed more stably.

[0033] In some embodiments, such as Figures 1-3 As shown, the first fixing member 141 is a bolt. The second fixing member 142 is a nut, and the first fixing member 141 and the second fixing member 142 are screwed together to achieve the purpose of tightly fixing and pressing the limiting frame 110, the radiator 210 and the heat transfer base 130. It is understood that in other embodiments, other detachable connection methods can also be used, such as snap-fit ​​connection or magnetic connection, etc., which are not limited here. It should be noted that in this embodiment, since the second fixing member 142 is a nut, when the second fixing member 142 is installed in the receiving groove 131, the outer side of the second fixing member 142 (specifically, the edge of the nut) will be interference-fitted with the side wall of the receiving groove 131, thereby preventing the second fixing member 142 from loosening during the connection process of the first fixing member 141 and the second fixing member 142; it is understood that in this embodiment, the second fixing member 142 may not be a nut, but has a protrusion that mates with the side wall of the receiving groove 131, which is not limited here.

[0034] For further information, please refer to [link / reference]. Figures 1-3 The limiting frame 110 has bolt holes 111 corresponding to the first fixing member 141. The first fixing member 141 passes through the bolt holes 111 and is screwed into the limiting frame 110 before being connected to the second fixing member 142. This makes the connection between the limiting frame 110, the first fixing member 141 and the second fixing member 142 more secure. At the same time, during the stroke of the first fixing member 141 passing through the limiting frame 110, the bolt holes 111 on the limiting frame 110 can also provide a guiding effect for the first fixing member 141.

[0035] In addition, such as Figures 1-3 As shown, along the direction of gravity, the head of the first fixing member 141 is located at the top of the limiting frame 110 and is limited by the top of the limiting frame 110 in the direction of gravity, thereby avoiding the separation of the first fixing member 141 and the limiting frame 110 during the welding process.

[0036] It should be noted that in some embodiments, there are multiple first fixing members 141 and second fixing members 142. Each first fixing member 141 and each second fixing member 142 are combined to form a fixing device 140. Multiple fixing devices 140 are spaced apart in the circumference of the welding fixture 100, so as to further enhance the fixing and pressing effect on the limiting frame 110, the radiator 210 and the heat transfer base 130 by setting multiple sets of fixing devices 140.

[0037] This application also provides a welding assembly that can be applied to a formic acid reflow soldering process, including the welding fixture 100, radiator 210 and weldment as described in any of the above claims. Along the direction of gravity, the radiator is disposed between the limiting frame and the heat transfer base, and the weldment is disposed on the radiator 210. The limiting frame 110 is used to limit the weldment in the length and / or width direction of the welding fixture 100.

[0038] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0039] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0040] The welding fixtures and welding components provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the methods and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A welding fixture (100), characterized in that, The fixture includes a limiting frame (110) and a heat transfer base (130) arranged sequentially along the direction of gravity. A radiator (210) is placed between the limiting frame (110) and the heat transfer base (130). The heat transfer base (130) is used to transfer heat to the radiator (210). The limiting frame (110) is used to limit the radiator (210) in the length and / or width direction of the welding fixture (100). The welding fixture (100) also includes a first fixing member (141) and a second fixing member (142). One end of the first fixing member (141) passes through the limiting frame (110), the radiator (210) and the heat transfer base (130) and is detachably connected to the second fixing member (142) so that the limiting frame (110), the radiator (210) and the heat transfer base (130) are fixedly connected.

2. The welding fixture (100) according to claim 1, characterized in that, Along the direction of gravity, the bottom of the heat transfer base (130) is provided with a receiving groove (131), and the second fixing member (142) is installed in the receiving groove (131).

3. The welding fixture (100) according to claim 2, characterized in that, When the second fastener (142) is installed in the receiving groove (131), the outer side of the second fastener (142) is interference-fitted with the side wall of the receiving groove (131).

4. The welding fixture (100) according to claim 2, characterized in that, The heat transfer base (130) has a mounting hole (132) on its side wall. The mounting hole (132) communicates with the receiving groove (131). The second fixing member (142) can be installed in the receiving groove (131) along the direction from the mounting hole (132) to the receiving groove (131).

5. The welding fixture (100) according to claim 4, characterized in that, Along the direction from the mounting hole (132) to the receiving groove (131), the projection of the second fastener (142) on the heat transfer base (130) is located within the receiving groove (131).

6. The welding fixture (100) according to claim 1, characterized in that, The first fixing member (141) and the second fixing member (142) are screwed together.

7. The welding fixture (100) according to claim 1, characterized in that, The first fixing member (141) is a bolt, and the limiting frame (110) has a bolt hole (111) corresponding to the first fixing member (141). The first fixing member (141) passes through the bolt hole (111) and is screwed into the limiting frame (110).

8. The welding fixture (100) according to claim 7, characterized in that, Along the direction of gravity, the head of the first fastener (141) is located on top of the limiting frame (110).

9. The welding fixture (100) according to claim 1, characterized in that, The number of the first fastener (141) and the second fastener (142) is multiple. Each of the first fastener (141) and each of the second fastener (142) is combined to form a fastening device (140). The multiple fastening devices (140) are spaced apart in the circumference of the welding fixture (100).

10. A welding assembly, characterized in that, include: Welding fixture (100) as described in any one of claims 1-9; A radiator (210) is disposed between the limiting frame (110) and the heat transfer base (130) along the direction of gravity. A weldment is disposed on the radiator (210), and the limiting frame (110) is used to limit the weldment in the length direction and / or width direction of the welding fixture (100).

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