Manufacturing method of heat dissipation structure and heat dissipation structure

Abstract

This invention provides a method for manufacturing a heat dissipation structure and a heat dissipation structure in which a forming base plate and heat sink fins are processed separately. Grooves are etched into the forming base plate, and the heat sink fins are assembled to the forming base plate using a tooth-fitting process to obtain the heat dissipation structure. This effectively reduces production costs. Furthermore, the heat sink fins are pre-assembled into intermediate bodies using guide fixtures, and these intermediate bodies are pre-arranged to correspond one-to-one with the grooves, improving assembly efficiency. Simultaneously, the guide fixtures guide the heat sink fins and shape them, reducing the risk of deformation damage caused by the compressive force during interference fit and ensuring the reliability of the tooth-fitting assembly. This invention, through the guidance and shaping of the guide fixtures, ensures the assembly effect of the tooth-fitting process, thereby supporting the separate processing of the base plate and heat sink fins, effectively reducing production costs and improving production efficiency.

Description

Technical Field

[0001] This invention relates to the field of unmanned aerial vehicle (UAV) motor manufacturing technology, and in particular to a method for manufacturing a heat dissipation structure and a heat dissipation structure. Background Technology

[0002] High-performance heat dissipation modules used inside motors typically consist of numerous sheet-like heat sinks to ensure sufficient heat dissipation area and guarantee heat dissipation performance. Current mainstream processing technologies for these sheet-like heat sinks include profile manufacturing, wire cutting, and 3D printing.

[0003] However, most current drones are small to medium-sized, with relatively small motors. Consequently, the heat sinks in the motor's cooling module are even thinner, posing challenges to manufacturing processes. The smaller spacing between the heat sinks necessitates thinner molds for profile processing, increasing the risk of mold breakage and compromising production reliability. Wire EDM can generally meet processing requirements, but it generates significant waste during the processing of block-shaped substrates, increasing material costs. 3D printing offers sufficient precision to meet performance requirements and produces less waste, but its printing costs are extremely high, and its production efficiency is low. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide a method for manufacturing a heat dissipation structure and a heat dissipation structure, so as to solve the problems of reliability, material cost and production efficiency of the existing heat dissipation structure manufacturing methods when facing the thinner heat sinks in drones.

[0005] This invention provides a method for manufacturing a heat dissipation structure, comprising: Obtain a base plate blank and carve grooves on the heat sink mounting surface of the base plate blank to obtain a molded base plate; Obtain a heat dissipation module and a guide fixture, and pre-assemble the heat dissipation module into the guide fixture to obtain an intermediate body. The heat dissipation module includes multiple independent heat dissipation fins, which are distributed at intervals in the intermediate body and correspond one-to-one with the grooves on the forming base plate. Drive the intermediate body so that the heat sink in the intermediate body is aligned with the groove on the molding base plate one by one, and drive the intermediate body to move relative to the molding base plate so that the heat sink is slidably embedded into the groove, thereby interfering and fixing the intermediate body to the molding base plate. After the intermediate body is assembled and fixed onto the molding base plate, the guide fixture is removed to obtain the assembled heat dissipation structure.

[0006] Optionally, the guide fixture includes a base with a receiving cavity in the base. The bottom of the receiving cavity is open, and the inner wall of the receiving cavity is provided with slots to form a plurality of slots spaced laterally along the base. The step of obtaining the intermediate body further includes inserting the heat sinks one by one into the slots.

[0007] Optionally, the guide fixture further includes a front guide structure, which is disposed at the longitudinal front end of the base. The front guide structure includes a plurality of guide plates, which are aligned one-to-one with the slot and arranged in parallel. The bottom of the guide plate is provided with a guide strip, which corresponds one-to-one with the groove, and the intermediate body is aligned with the groove through the guide strip; The step of controlling the intermediate body to align the heat sink in the intermediate body with the grooves on the molding base plate further includes: The guide bar slides the end of the intermediate body into the groove, and drives the intermediate body to slide along the extension direction of the groove until the heat sink located at the rear end of the guide bar contacts the groove.

[0008] Optionally, the front end of the guide strip is provided with a tapered guide head, and the intermediate body is positioned by cooperating with the groove through the tapered guide head.

[0009] Optionally, the guide plates are also fixedly connected by reinforcing blocks.

[0010] Optionally, after obtaining the base plate blank and before etching grooves on the heat sink mounting surface of the base plate blank, the method further includes: bending and shaping the base plate blank.

[0011] Optionally, the step of removing the guide fixture includes: vertically moving the guide fixture out along the vertical direction of the heat sink.

[0012] Optionally, the step of obtaining the heat dissipation module and the guide fixture further includes: obtaining a heat sink blank and stamping a formed heat sink according to the heat sink blank, so as to obtain the heat dissipation module according to multiple heat sinks.

[0013] Another aspect of the present invention provides a heat dissipation structure, which is obtained by the heat dissipation structure manufacturing method described above.

[0014] The heat dissipation structure manufacturing method of this invention selects a tooth-cutting process. First, grooves are engraved on the base plate blank to obtain a shaped base plate. Then, the heat sinks of the heat dissipation module are pre-assembled onto a guide fixture to obtain an intermediate body. The guide fixture completes the alignment of the heat sinks with the grooves on the shaped base plate. Then, the intermediate body is assembled with the shaped base plate, thereby completing the tooth-cutting interference fit of all heat sinks to the shaped base plate in one go. After the intermediate body and the shaped base plate are assembled, the guide fixture is removed to obtain the assembled heat dissipation structure. In this invention, the groove depth is much smaller than the height of the heat sink, resulting in less material removal and effectively reducing material costs. The heat sinks of the heat dissipation module are produced separately, and stamping production can be selected, resulting in less material waste and high precision. While guiding the heat sinks, the guide fixture can also limit the shape of the heat sinks, reducing the risk of deformation damage to the heat sinks caused by the extrusion pressure during interference fit and ensuring the reliability of the assembly. Attached Figure Description

[0015] Figure 1 This is a flowchart illustrating the main process of manufacturing the heat dissipation structure in this embodiment of the invention. Figure 2 This is a schematic diagram of the base plate manufacturing process in the heat dissipation structure manufacturing method of the present invention. Figure 3 This is a schematic diagram of part of the assembly principle in the heat dissipation structure manufacturing method of the present invention; Figure 4 This is a schematic diagram of the operation of removing the guide tooling in the heat dissipation structure manufacturing method of the present invention. Figure 5 This is a schematic diagram of the guide fixture in the heat dissipation structure manufacturing method of the present invention. Figure 6 for Figure 5 A magnified view of a portion of region A1 in the middle; Figure 7 for Figure 5 A magnified view of a portion of region A2 in the middle; Figure 8 for Figure 5 A magnified view of a portion of area A3 in the middle; Figure 9 This is a partial structural diagram of the guide tooling in the heat dissipation structure manufacturing method of the present invention.

[0016] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0017] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0018] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0020] To address the challenges of compatibility between reliability, material cost, and production efficiency in existing heat dissipation structure manufacturing methods, this invention provides a heat dissipation structure manufacturing method employing a toothed fitting process. First, grooves are etched into a base plate blank to obtain a shaped base plate. Then, the heat sinks of the heat dissipation module are pre-assembled onto a guide fixture to obtain an intermediate body. The guide fixture aligns the heat sinks with the grooves on the shaped base plate. Next, the intermediate body is assembled with the shaped base plate, allowing for a one-time toothed interference fit of all heat sinks to the shaped base plate. After assembly, the guide fixture is removed, yielding the assembled heat dissipation structure. Notably, the groove depth is significantly less than the height of the heat sinks, resulting in minimal material removal and effectively reducing material costs. The heat sinks of the heat dissipation module are produced separately, potentially through stamping, minimizing material waste and achieving high precision, thus meeting the performance requirements of the heat dissipation structure. Furthermore, the guide fixture guides the heat sinks while also limiting their shape, reducing the risk of deformation damage caused by the compressive stress during interference fit and ensuring assembly reliability.

[0021] Specifically, such as Figure 1 The heat dissipation structure manufacturing method of this embodiment includes: Step S01: Obtain the base plate blank and carve grooves on the heat sink mounting surface of the base plate blank to obtain the molded base plate; Step S02: Obtain the heat dissipation module and the guide fixture, and pre-assemble the heat dissipation module into the guide fixture to obtain an intermediate body. The heat dissipation module includes multiple independent heat dissipation fins, which are spaced apart in the intermediate body and correspond one-to-one with the grooves on the forming base plate. Step S03: Drive the intermediate body so that the heat sink in the intermediate body is aligned with the groove on the molding base plate one by one, and drive the intermediate body to move relative to the molding base plate so that the heat sink is slidably embedded into the groove, and then the intermediate body is interference-fitted and fixed to the molding base plate. Step S04: After the intermediate body is assembled and fixed onto the molding base plate, the guide fixture is removed to obtain the assembled heat dissipation structure.

[0022] In step S01, the shape of the molded base plate 13 needs to be adapted according to the different installation positions of the heat dissipation structure. For example, in one instance, the heat dissipation structure is set inside the stator of the motor, surrounding the center, and is limited and fixed by the circular outer shell of the stator and radial ribs. In this case, the molded base plate 13 needs to be arc-shaped to fit the circular outer shell of the stator. Correspondingly, as shown in the example... Figure 2 As shown, in step S01, after obtaining the base plate blank 10, the base plate blank 10 is shaped by multiple bending rollers 101 to obtain an arc-shaped base plate blank 11. Then, grooves 131 are engraved on the inner side of the arc-shaped base plate blank 11. The grooves 131 are through grooves so that the heat sink can slide and embed along the extension direction of the grooves 131 and be fixed by interference fit.

[0023] The grooves 131 are processed after bending to avoid damage to the grooves 131 caused by mechanical stress during the bending process. Depending on the specific requirements of the heat dissipation structure, the heat sinks are arranged in a parallel or radial fan-shaped layout, and correspondingly, the depth direction of each groove 131 is aligned with this. The specific configuration is determined based on actual needs, and this application does not impose any particular limitations on it.

[0024] To guide the assembly of the heat sink 20 to the molded base plate 13, please refer to the following further instructions. Figure 3 , Figure 4 , Figure 5 and Figure 6 The guide fixture 30 includes a base, in which a receiving cavity 31 is provided. The bottom of the receiving cavity 31 is an open structure. The inner wall of the receiving cavity is provided with slots 311 (opened on the front, top and rear sides to ensure the limiting effect of the heat sink 20) ​​to form multiple slots arranged laterally along the base. The size of the slots corresponds to the size of the heat sink 20 so that the heat sink 20 can be inserted into the corresponding slots one by one.

[0025] After the heat sink 20 is inserted into the slot, an intermediate body is obtained. In the intermediate body, the bottom part of the heat sink 20 is exposed outside the receiving cavity 31, and the length of the exposed part is consistent with the depth of the groove 131 on the molded base plate 13.

[0026] During the assembly of the intermediate body to the forming base plate 13, the bottom of the guide fixture 30 is in contact with the mounting surface of the forming base plate 13 to limit the posture, thereby ensuring the posture stability of each heat sink 20 limited by the guide fixture 30, keeping the bottom end of each heat sink 20 parallel to the corresponding groove 131 and sliding in the groove 131 to ensure the assembly effect.

[0027] After the intermediate components are assembled, such as Figure 4 As shown, the assembled heat dissipation structure can be obtained by vertically moving the guide fixture 30 along the vertical direction of the heat sink 20. In this embodiment, the heat sink 20 is arranged in parallel, and the guide fixture 30 can be moved vertically. In an optional embodiment, the heat sink 20 is arranged radially, and when the guide fixture 30 is an integral fixed structure, it does not need to be moved vertically.

[0028] In an optional configuration, when the heat sink 20 is arranged radially, the guide fixture 30 is configured as a segmented structure, divided into front and rear parts (with...). Figure 4 For directional reference, and consisting of left and right parts, a disassembleable receiving cavity 31 is required. The alignment and assembly of the front and rear parts are limited by a fixed guiding structure (e.g., a guide groove and guide rod at the mating end), preventing lateral displacement between them and thus avoiding deformation of the heat sink positioned within. Therefore, when the intermediate body is assembled onto the molding base plate 13, the guide fixture 30 is mainly subjected to force on one side (rear side force, with...). Figure 4 (For directional reference, with force applied to the left side) to push the heat sink 20 into the groove 131, while simultaneously applying force from above to ensure the intermediate body is pressed firmly onto the molding base plate 13. That is, when the intermediate body is assembled onto the molding base plate 13, the front and rear parts of the guide fixture 30, divided into front and rear sections, will not be subjected to forces that would cause them to separate. During the assembly of the intermediate body onto the molding base plate 13, reliable guidance and positioning of the pre-assembled heat sink can be ensured. After assembly, the front and rear parts of the guide fixture can be moved out unimpeded along the front-rear direction.

[0029] To facilitate the removal of the guide fixture 30, the slots of the heat sink 20 and the guide fixture 30 can be fitted with a clearance. Correspondingly, to prevent the heat sink 20 from coming out of the guide fixture 30, in such a way... Figure 3 In the assembly of the intermediate body to the forming base plate 13 shown, the positions of the forming base plate 13 and the intermediate body can be reversed, that is, the forming base plate 13 is on top and the intermediate body is on the bottom. The heat sink 20 pre-assembled in the guide fixture 30 can be naturally positioned in the guide fixture 30 under gravity.

[0030] To ensure the reliability of the interference fit between the heat sink 20 and the groove 131 of the forming base plate 13, and to avoid excessive interference that could cause the heat sink 20 to bend under the guidance and shaping of the guide fixture 30, the interference amount needs to be specifically determined based on the materials of the heat sink 20 and the forming base plate 13, as well as the thickness parameters of the heat sink 20. This application does not impose any special limitations on this.

[0031] To facilitate the assembly and alignment of the intermediate body and the molding base plate 13, please refer to the following: Figure 7 , Figure 8 and Figure 9 In this embodiment, the guide fixture 30 also includes a front guide structure, which is disposed at the longitudinal front end of the base. The front guide structure includes a plurality of guide pieces 32, which are aligned one-to-one with the slot 1 and arranged in parallel, so that each guide piece 32 can be located at the front end of each heat sink 20. The bottom end of each guide piece 32 is in contact with the assembly surface of the molding base plate 13, thus ensuring the fit and positioning posture between the intermediate body and the molding base plate 13 in advance, reducing the risk that the heat sink 20 will tilt and embed into the groove 131 due to the tilt of the posture, which will affect the assembly effect.

[0032] To further enhance the guiding effect during assembly, a guide strip 321 is also provided at the bottom of the guide plate 32. The guide strip 321 corresponds one-to-one with the groove 131 and can be embedded in the groove 131, so that the intermediate body is aligned with the groove 131 through the guide strip 321 and physically limited. Correspondingly, the step of controlling the intermediate body to align the heat sink in the intermediate body with the groove on the molding base plate also includes: sliding the end of the intermediate body into the groove 131 through the guide strip 321, and driving the intermediate body to slide along the extension direction of the groove 131 until the heat sink 20 located at the rear end of the guide strip 321 contacts the groove 131.

[0033] The guide bar 321 is located in front of the heat sink 20. While guiding the assembly, it can also clean the groove 131 in advance to avoid the interference of debris falling into it on the subsequent interference assembly.

[0034] To improve the guiding effect of assembly, a tapered guide head 322 is provided at the front end of the guide strip 321, and the intermediate body is positioned by cooperating with the groove 131 through the tapered guide head 322.

[0035] To avoid positional displacement of the guide piece 32, in this embodiment, such as Figure 9 As shown, the guide plates 32 are also fixedly connected by reinforcing blocks 33, which can prevent the guide plates 32 from tilting or shifting, thus ensuring the reliability of the guide. It can also reduce the overall weight of the guide fixture 30.

[0036] In this embodiment, the heat sink 20 is assembled and fixed to the forming base plate 13 by a tooth-cutting process, so that the heat sink 20 can be processed individually. Therefore, processing technology other than profile processing, wire cutting process and 3D printing process can be selected, such as stamping process. Correspondingly, the steps of obtaining the heat dissipation module and guide tooling also include: obtaining heat sink blank and stamping the heat sink blank to obtain the formed heat sink, so as to obtain the heat dissipation module based on multiple heat sinks.

[0037] Among them, the stamping process can also simultaneously process a turbulence fin structure that warps to one side on the heat sink, thereby simultaneously processing an eddy current generator and improving the heat dissipation capacity of the heat dissipation structure.

[0038] The present invention also provides a heat dissipation structure, which is obtained by the above-described heat dissipation structure manufacturing method. The base plate and heat sink are processed separately and then assembled and fixed by a tooth-clamping process. This can effectively get rid of the dependence on existing profile processing, wire cutting processing and 3D printing processing, and reduce production costs while meeting processing accuracy.

[0039] This invention innovatively selects a method of processing the base plate and heat sink separately, combined with gear hobbing process and guide tooling, to ensure the assembly reliability of the base plate and heat sink, guarantee production yield, and can simply and effectively meet the processing accuracy of the heat dissipation structure, guarantee the performance of the heat dissipation structure, and thus effectively reduce the manufacturing cost of the heat dissipation structure for high-performance motors.

[0040] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] The embodiments described above are merely illustrative of several specific implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method for manufacturing a heat dissipation structure, characterized in that, include: Obtain a base plate blank and carve grooves on the heat sink mounting surface of the base plate blank to obtain a molded base plate; Obtain a heat dissipation module and a guide fixture, and pre-assemble the heat dissipation module into the guide fixture to obtain an intermediate body. The heat dissipation module includes multiple independent heat dissipation fins, which are distributed at intervals in the intermediate body and correspond one-to-one with the grooves on the forming base plate. Drive the intermediate body so that the heat sink in the intermediate body is aligned with the groove on the molding base plate one by one, and drive the intermediate body to move relative to the molding base plate so that the heat sink is slidably embedded into the groove, thereby interfering and fixing the intermediate body to the molding base plate. After the intermediate body is assembled and fixed onto the molding base plate, the guide fixture is removed to obtain the assembled heat dissipation structure.

2. The method for manufacturing a heat dissipation structure according to claim 1, characterized in that, The guide fixture includes a base with a receiving cavity. The bottom of the receiving cavity is open. The inner wall of the receiving cavity is provided with slots to form a plurality of slots spaced laterally along the base. The step of obtaining the intermediate body further includes inserting the heat sink into the slots one by one.

3. The method for manufacturing a heat dissipation structure according to claim 2, characterized in that, The guide fixture also includes a front guide structure, which is disposed at the longitudinal front end of the base. The front guide structure includes multiple guide pieces, which are aligned one-to-one with the slot and arranged in parallel. The bottom of the guide plate is provided with a guide strip, which corresponds one-to-one with the groove, and the intermediate body is aligned with the groove through the guide strip; The step of controlling the intermediate body to align the heat sink in the intermediate body with the grooves on the molding base plate further includes: The guide bar slides the end of the intermediate body into the groove, and drives the intermediate body to slide along the extension direction of the groove until the heat sink located at the rear end of the guide bar contacts the groove.

4. The method for manufacturing a heat dissipation structure according to claim 3, characterized in that, The guide strip has a tapered guide head at its front end, and the intermediate body is positioned by the tapered guide head engaging with the groove.

5. The method for manufacturing a heat dissipation structure according to claim 3, characterized in that, The guide plates are also fixedly connected by reinforcing blocks.

6. The method for manufacturing a heat dissipation structure according to claim 1, characterized in that, After obtaining the base plate blank and before carving grooves on the heat sink mounting surface of the base plate blank, the method further includes: bending and shaping the base plate blank.

7. The method for manufacturing a heat dissipation structure according to claim 1, characterized in that, The step of removing the guide fixture includes: vertically moving the guide fixture out along the vertical direction of the heat sink.

8. The method for manufacturing a heat dissipation structure according to claim 1, characterized in that, The steps of obtaining the heat dissipation module and the guide fixture further include: obtaining a heat sink blank and stamping a formed heat sink according to the heat sink blank, so as to obtain the heat dissipation module according to multiple heat sinks.

9. A heat dissipation structure, characterized in that, Obtained by the method of manufacturing the heat dissipation structure according to any one of claims 1 to 8.

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