A heat dissipation tool for preventing plasma spraying ablation deformation of a thin-walled part

Abstract

This utility model discloses a heat dissipation fixture for preventing ablation and deformation of thin-walled parts during plasma spraying. The fixture includes: a contoured heat-conducting block, comprising a mating surface that matches the non-sprayed surface of the thin-walled part, and the heat-conducting block is used to hold the thin-walled part; a dry ice cooling system for cooling the contoured heat-conducting block; a temperature monitoring system for monitoring the temperature of the sprayed surface of the thin-walled part; and a thermally conductive silicone grease layer disposed on the mating surface of the contoured heat-conducting block to fill the gap between the mating surface and the thin-walled part. This utility model solves the technical problem of thin-walled parts being easily ablated and deformed during plasma spraying, achieving the technical effect of real-time, rapid, and continuous heat dissipation for thin-walled parts.

Description

Technical Field

[0001] This utility model relates to the field of thermal spraying tooling technology, specifically a heat dissipation tooling that prevents the ablation and deformation of thin-walled parts during plasma spraying. Background Technology

[0002] Metal components of Hall thruster systems for small and micro satellites are subjected to not only the sputtering and abrasion of plasma jets during service, but also extreme temperatures and thermal radiation from celestial bodies, making them highly susceptible to deformation and burn-off. While plasma spraying is an effective way to extend component lifespan, for thin-walled parts requiring large-area spraying, such as support caps, heat can accumulate rapidly during the spraying process, leading to ablation, warping, and deformation, especially at the edges. This not only affects assembly accuracy but also degrades the substrate structure and mechanical properties, posing safety hazards. Therefore, effective temperature control of the workpiece during the spraying process is crucial.

[0003] To effectively control workpiece temperature, existing technologies include Chinese patent application CN202311838761.X, which uses rigid tooling combined with stress-relief treatment to improve the bending phenomenon caused by stress release after thermal spraying of thin-walled parts; and Chinese patent CN202310052943.8, which uses a cooling device combined with a hollow support and reduces workpiece deformation during the inner hole spraying process by flipping the workpiece and spraying it twice. However, none of these solutions achieve real-time, rapid, and continuous heat dissipation for thin-walled parts during the spraying process, making it difficult to prevent ablation and deformation caused by heat accumulation from the source.

[0004] Therefore, there is an urgent need for a heat dissipation fixture that can dissipate heat in real time and control the temperature precisely during plasma spraying to prevent the ablation and deformation of thin-walled parts. Utility Model Content

[0005] This application provides a heat dissipation fixture to prevent the ablation and deformation of thin-walled parts during plasma spraying, thereby solving the technical problem that thin-walled parts are prone to ablation and deformation during plasma spraying.

[0006] This application provides a heat dissipation fixture for preventing ablation and deformation of thin-walled parts during plasma spraying, comprising:

[0007] The conformal heat-conducting block includes a mating surface for matching the unpainted surface of a thin-walled part, and the conformal heat-conducting block is used to place the thin-walled part.

[0008] Dry ice cooling system, used to cool the contoured heat-conducting block;

[0009] Temperature monitoring system, used to monitor the temperature of the coated surface of thin-walled parts;

[0010] A thermal grease layer is applied to the mating surface of the conformal thermal block to fill the gap between the mating surface and the thin-walled component.

[0011] By adopting the above technical solution, the heat on the thin-walled parts can be quickly discharged through the conformal heat conduction block using the dry ice cooling system, which can avoid problems such as ablation, warping, and deformation caused by heat accumulation during the ion spraying process. At the same time, the temperature monitoring system works in conjunction with the dry ice cooling system to achieve closed-loop temperature control, enabling real-time heat dissipation and precise temperature control during the plasma spraying process.

[0012] Optionally, the contoured heat-conducting block is provided with a first heat-conducting block protrusion for matching with a first thin-walled groove on the thin-walled part.

[0013] Optionally, the contoured heat-conducting block is provided with a second heat-conducting block protrusion for matching the second thin-walled groove on the thin-walled part.

[0014] Optionally, the heat-conducting block is also provided with a heat-conducting block side stop for abutting against the side of the thin-walled part.

[0015] Optionally, the dry ice cooling system includes a dry ice storage unit, a delivery pipeline, and an injection nozzle connected in sequence. The injection nozzle is used to inject solid carbon dioxide from the dry ice storage unit onto the contour heat-conducting block through the delivery pipeline.

[0016] Optionally, the side of the conformal heat-conducting block opposite to the bonding surface is a cooling surface, and the spray nozzle is used to cool the cooling surface.

[0017] Optionally, the temperature monitoring system includes a temperature sensor and a display connected to the temperature sensor, the temperature sensor being used to detect the temperature of the coated surface of the thin-walled part.

[0018] Optionally, the assembly gap between the mating surface of the contoured heat-conducting block and the uncoated surface of the thin-walled part is 0.05mm-0.3mm.

[0019] Optionally, the assembly gap between the mating surface and the unpainted surface is 0.05mm-0.2mm on both curved and flat surfaces.

[0020] Optionally, the assembly gap between the mating surface and the unpainted surface is 0.2mm-0.3mm in deep cavities and at corners.

[0021] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0022] (1) In this application, the contact surface of the conformal heat-conducting block is conformally matched with the non-sprayed surface of the thin-walled part, and a thermal grease layer is applied to the contact surface to fill the tiny gap between the conformal heat-conducting block and the thin-walled part, eliminating the air insulation layer between them to achieve better heat conduction effect; at the same time, in conjunction with the dry ice cooling system, a complete heat dissipation path is formed, and through continuous monitoring and feedback of the temperature monitoring system, the spraying temperature can be stably controlled within a safe range to avoid overheating, ablation, warping and deformation of the thin-walled part, ensuring dimensional accuracy and surface quality, and the ablation and deformation prevention effect is significant.

[0023] (2) The heat dissipation fixture of this application can realize continuous heat dissipation during the spraying process, without the need for frequent shutdowns to cool down, reducing the number and time of intermittent spraying, and improving spraying efficiency; at the same time, it avoids scrapping and rework of workpieces and reduces production costs.

[0024] (3) The heat dissipation fixture of this application also adopts a differentiated gap design, which takes into account both the fitting accuracy and thermal expansion space, and prevents jamming, scratches and roughening. It can be adapted to flat surfaces, curved surfaces, deep cavities and corners, and can meet the spraying needs of complex structure thin-walled parts.

[0025] (4) The heat dissipation fixture of this application provides real-time feedback through a temperature monitoring system and is rapidly cooled with dry ice to achieve closed-loop temperature control. The thermal grease layer is heat-resistant and has stable performance. The dry ice cooling system has no residue and requires no cleaning. It has high overall reliability and a simple structure. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of the coating surface of a thin-walled part provided in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the non-coated surface of a thin-walled part provided in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of the contour-conducting heat block provided in an embodiment of the present utility model;

[0030] Figure 4 An exploded view of the contour-conducting heat block provided in this embodiment of the utility model;

[0031] Figure 5 A schematic diagram of the contoured heat-conducting block and thin-walled component provided in the embodiments of this utility model;

[0032] Figure 6 This is a schematic diagram of the structure of the heat dissipation fixture provided in an embodiment of the present utility model;

[0033] Figure 7 A cross-sectional view of the contoured heat-conducting block and thin-walled component provided in an embodiment of this utility model;

[0034] Figure 8 for Figure 7 A magnified view of region A in the middle.

[0035] Explanation of reference numerals in the attached figures:

[0036] 100-Contouring heat-conducting block; 110-Mating surface; 120-Cooling surface; 130-First heat-conducting block protrusion; 140-Second heat-conducting block protrusion; 151-Heat-conducting block body; 152-Heat-conducting block side plate; 153-Slope block; 160-Threaded hole; 200-Dry ice cooling system; 210-Dry ice storage unit; 220-Delivery pipeline; 230-Spray nozzle; 300-Temperature monitoring system; 310-Temperature sensor; 320-Display; 400-Thermal grease layer; 500-Thin-walled component; 501-Spray body; 502-Extension body; 510-Non-spray surface; 520-Spray surface; 530-First thin-walled groove; 540-Second thin-walled groove; 550-Support cap threaded hole. Detailed Implementation

[0037] 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.

[0038] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or server that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or modules not explicitly listed or inherent to such processes, methods, products, or devices.

[0039] like Figure 1-8As shown, a heat dissipation fixture for preventing plasma spraying ablation and deformation of thin-walled parts according to this embodiment includes: a contoured heat-conducting block 100, a dry ice cooling system 200, a temperature monitoring system 300, and a thermal grease layer 400.

[0040] Thin-walled component 500 integral structure as follows Figure 1 and Figure 2 As shown, the thin-walled component 500 includes a spray body 501 and an extension 502 extending downward from one side of the spray body 501. The spray body 501 is L-shaped, with its top surface being the spray surface 520 and its bottom surface having a first thin-walled groove 530. All surfaces of the first thin-walled groove 530 belong to the non-spray surface 510 of the thin-walled component 500. The extension 502 extends downward from the longest side of the spray body 501, with a second thin-walled groove 540 on its bottom surface. The top surface of the extension 502 belongs to the spray surface 520, and all surfaces of the second thin-walled groove 540, as well as the side of the extension 502 away from the end of the spray body 501, belong to the non-spray surface 510 of the thin-walled component 500.

[0041] The overall structure of the contoured heatsink 100 is as follows: Figure 3 and Figure 4 As shown, the contoured heat-conducting block 100 consists of a heat-conducting block body 151 and a heat-conducting block side plate 152. The heat-conducting block body 151 is generally L-shaped, and a first heat-conducting block protrusion 130 is provided on the top surface of the heat-conducting block body 151. The first heat-conducting block protrusion 130 matches the first thin-walled groove 530 and is used to support and fix the position of the spray body 501. The top surface of the heat-conducting block body 151 is a contact surface 110 for contoured contact with the thin-walled part 500.

[0042] A ramp block 153 extends from the longest side of the heat-conducting block body 151 to match the extension body 502, and the ramp block 153 extends downward. A second heat-conducting block protrusion 140 is provided on the top surface of the ramp block 153. The second heat-conducting block protrusion 140 matches the second thin-walled groove 540 and is used to support and fix the position of the extension body 502. The heat-conducting block side guard 152 is fixedly connected to the ramp block 153 by bolts. The heat-conducting block side guard 152 is used to abut against the non-sprayed surface 510 of the tip on the side of the extension body 502 away from the end of the spray body 501 and to protect the non-sprayed surface 510 of the tip on the extension body 502.

[0043] The heat-conducting block 100 is made of copper, copper alloy or copper-based composite material, with a thermal conductivity of 380W / (m・K)-401W / (m・K). It has high thermal conductivity and can quickly dissipate heat, while taking into account certain structural strength and processing accuracy, and is suitable for precision contouring processing needs.

[0044] To facilitate fixing and connection, the contoured heat-conducting block 100 is also provided with a threaded hole 160, which is used to connect with the support cover threaded hole 550 provided on the thin-walled part 500.

[0045] A thermally conductive silicone grease layer 400 is applied to the mating surface 110 of the conformal thermally conductive block 100 to fill the gap between the mating surface 110 and the thin-walled component 500, eliminating the air insulation layer and improving the interface heat transfer efficiency. The thermally conductive silicone grease layer 400 used in this application uses modified silicone oil as a base and can be compounded with high thermal conductivity fillers. After compounding and modification, its thermal conductivity is >12W / (m·K), and it does not volatilize, solidify, or leak oil within the operating temperature range of 0℃-300℃. It can completely fill the tiny gaps between the conformal thermally conductive block 100 and the thin-walled component 500, reducing the interface thermal resistance.

[0046] Preferably, the thermal conductivity of the thermal grease layer 400 is 13.8 W / (m·K).

[0047] like Figure 8 As shown, the assembly gap between the mating surface 110 of the contoured heat-conducting block 100 and the non-coated surface 510 of the thin-walled part 500 is 0.05mm-0.3mm. The assembly gap is designed differently for different parts of the thin-walled part, taking into account their structural characteristics: for simple structures such as curved surfaces and flat surfaces with uniform stress, the assembly gap is controlled at 0.05mm-0.2mm, balancing fit and heat transfer efficiency; for areas with complex structures such as deep cavities and corners, where heat easily accumulates and thermal expansion space is insufficient, the local gap is widened to 0.2mm-0.3mm to effectively release thermal stress and prevent deformation of the thin-walled part 500 or damage to the tooling caused by stress concentration.

[0048] The dimensional tolerance of the mating surface 110 is IT8-IT10, and the positional tolerance of the mating surface 110 relative to its positioning reference is ≤0.1mm. This ensures accurate positioning and allows for thermal expansion space while preventing scratches and jamming.

[0049] The design of the aforementioned thermally conductive silicone grease layer 400 and the bonding surface 110 not only ensures the precise bonding and positioning of the tooling and the thin-walled part 500, ensuring the stability of heat conduction, but also reserves a reasonable space for thermal expansion, effectively preventing the tooling and the thin-walled part from deforming and jamming due to over-positioning or high spraying temperature, thereby avoiding scratches, roughening and other damage on the surface of the thin-walled part. At the same time, it ensures the masking effect of the tooling on non-sprayed areas and prevents the coating from being sprayed accidentally.

[0050] The dry ice cooling system 200 includes a dry ice storage unit 210, a delivery pipeline 220, and a spray nozzle 230 connected in sequence. The spray nozzle 230 is used to spray solid carbon dioxide from the dry ice storage unit 210 onto the contour heat-conducting block 100 through the delivery pipeline 220. The bottom surface of the contour heat-conducting block 100 is a cooling surface 120, and the spray nozzle 230 is used to cool the cooling surface 120. The dry ice cooling system 200 utilizes the phase change endothermic property of dry ice sublimation to quickly remove the heat dissipated by the contour heat-conducting block 100, achieving real-time cooling of the tooling and indirectly controlling the temperature of the thin-walled part 500, thus preventing heat accumulation. At the same time, after the dry ice sublimates, it directly converts into carbon dioxide gas, leaving no waste liquid or residue, and does not pollute the spraying environment or affect the surface of the thin-walled part 500 or the coating quality.

[0051] The temperature monitoring system 300 includes a temperature sensor 310 and a display 320 connected to the temperature sensor 310. The temperature sensor 310 is used to detect the temperature of the coating surface 520 of the thin-walled part 500. The temperature sensor 310 is an infrared temperature sensor. The infrared temperature sensor is aligned with the coating deposition point of the thin-walled part 500, and can collect the temperature data of the deposition point in real time, transmitting it to the display 320 for intuitive display. This allows operators to monitor the temperature status of the thin-walled part 500 in real time. Once the temperature approaches the ablation threshold, the spraying parameters or dry ice cooling intensity can be adjusted in time to avoid overheating, ablation, deformation, and other problems of the thin-walled part 500, achieving precise temperature control during the spraying process. The temperature monitoring system 300 uses an infrared sensor to collect the temperature of the coating deposition point in real time, maintaining a stable temperature between 70℃ and 120℃ during the spraying process, achieving precise temperature control without interrupting the spraying process.

[0052] In summary, this utility model, through the synergistic effect of "rapid heat conduction - forced cooling - real-time temperature control", avoids heat accumulation from the source, effectively prevents ablation, warping and deformation of thin-walled parts, and ensures dimensional accuracy and coating quality; at the same time, it can be continuously sprayed, reducing cooling intervals and significantly improving production efficiency. It is suitable for controlling ablation and deformation during plasma spraying of thin-walled parts in satellite Hall thruster systems.

[0053] It should be noted that the order of the embodiments described above is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. Furthermore, specific embodiments have been described above. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps described in the claims can be performed in a different order than that shown in the embodiments and still achieve the desired result. Additionally, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0054] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0055] This specification and accompanying drawings are merely illustrative examples of this application and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Therefore, if such modifications and modifications fall within the scope of this application and its equivalents, this application intends to include such modifications and modifications.

Claims

1. A heat dissipation tooling for preventing plasma spray ablation distortion of a thin-walled member, characterized by, include: A contoured heat-conducting block (100) includes a mating surface (110) for matching the non-coated surface (510) of a thin-walled component (500), the contoured heat-conducting block (100) being used to place the thin-walled component (500). A dry ice cooling system (200) is used to cool the contoured heat-conducting block (100); Temperature monitoring system (300) is used to monitor the temperature of the coating surface (520) of the thin-walled part (500); A thermally conductive grease layer (400) is disposed on the bonding surface (110) of the conformal thermal block (100) to fill the gap between the bonding surface (110) and the thin-walled component (500).

2. The heat dissipation tooling of claim 1, wherein, The conformal heat-conducting block (100) is provided with a first heat-conducting block protrusion (130) for matching the first thin-walled groove (530) on the thin-walled member (500).

3. The heat dissipation tooling of claim 2, wherein, The conformal heat-conducting block (100) is provided with a second heat-conducting block protrusion (140) for matching the second thin-walled groove (540) on the thin-walled member (500).

4. The heat sink tooling of any of claims 1-3, wherein, The conformal heat-conducting block (100) is also provided with a heat-conducting block side stop (152) for abutting against the side of the thin-walled member (500).

5. The heat sink tooling of claim 1, wherein, The dry ice cooling system (200) includes a dry ice storage unit (210), a delivery pipeline (220), and a spray nozzle (230) connected in sequence. The spray nozzle (230) is used to spray solid carbon dioxide in the dry ice storage unit (210) onto the contour heat-conducting block (100) through the delivery pipeline (220).

6. The heat sink of claim 5, wherein the plurality of fins are arranged in a plurality of rows, and the plurality of rows are arranged in a plurality of columns. The side of the conformal heat-conducting block (100) opposite to the bonding surface (110) is the cooling surface (120), and the spray nozzle (230) is used to cool the cooling surface (120).

7. The heat sink of claim 1, wherein, The temperature monitoring system (300) includes a temperature sensor (310) and a display (320) connected to the temperature sensor (310), the temperature sensor (310) being used to detect the temperature of the sprayed surface (520) of the thin-walled part (500).

8. The heat sink of claim 1, wherein, The assembly gap between the mating surface (110) of the contoured heat-conducting block (100) and the non-coated surface (510) of the thin-walled part (500) is 0.05mm-0.3mm.

9. The heat sink of claim 8, wherein the plurality of fins are arranged in a plurality of rows, and the plurality of rows are arranged in a plurality of columns. The assembly gap between the mating surface (110) and the non-sprayed surface (510) is 0.05mm-0.2mm on both the curved and flat surfaces.

10. The heat dissipation tooling of claim 8, wherein, The assembly gap between the mating surface (110) and the non-sprayed surface (510) is 0.2mm-0.3mm in the deep cavity and at the corners.

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