Cleaning method for A sandwich structure ceramic 3D printing product
Through the combination of ultrasonic cavitation cleaning, pulsed airflow purge and negative pressure flash drying, the problem of cleaning the sandwich structure of the missile head cover A is solved, and the cleaning effect and material performance are achieved.
Patent Information
- Application Number
- CN202510816362.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-18
- Publication Date
- 2025-07-22
AI Technical Summary
The prior art is difficult to effectively clean the A-sandwich structure of the missile head cover, especially dirt and residues in the honeycomb core layer, and traditional methods may damage material properties.
The combination of ultrasonic cavitation cleaning, pulsed airflow purge and negative pressure flash drying is adopted, combining nanobubble cores, phase modulation ultrasonic waves and specific airflow parameters to achieve cleaning of A-sandwich ceramic 3D printing products.
Without damaging the product structure and materials, effective cleaning of A-sandwich ceramic 3D printing products is achieved to maintain the performance and reliability of the missile head cover.
Smart Images
Figure CN120347020A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of aerospace material surface cleaning, and particularly relates to a cleaning method for a 3D printed product with an A sandwich structure ceramic. Background Art
[0002] As an important part of the missile system, the performance of the missile nose cone directly affects the overall combat effectiveness of the missile. The missile nose cone needs to have high wave transmission performance to ensure unobstructed transmission of radar guidance and communication signals during missile flight. At the same time, it also needs to have excellent high-temperature resistance and high structural strength to ensure structural integrity and functional stability under extreme temperature changes and various mechanical loads.
[0003] To meet these stringent performance requirements, the missile nose cone is often designed as an A sandwich structure, including inner and outer skins and a honeycomb core layer that communicates with each other, which has the advantages of light weight, high strength, high-temperature resistance, and good wave transmission and load-bearing performance.
[0004] However, the cleaning of the honeycomb core layer structure has always been a technical problem in the manufacturing and maintenance of missile nose cones. Due to the presence of a large number of fine pores and interconnected channels inside it, traditional cleaning methods are difficult to effectively remove dirt, debris, and residues in the pores. Incomplete cleaning will affect the wave transmission performance and structural performance of the nose cone. At the same time, damage to the nose cone material during the cleaning process needs to be avoided to prevent affecting its high-temperature resistance and high structural strength and other properties. Therefore, developing a cleaning method that can effectively clean products with an A sandwich structure without damaging the product structure and materials is of great significance for ensuring the performance and reliability of missile nose cones. Summary of the Invention
[0005] To solve the technical problem of how to effectively clean products with an A sandwich structure without damaging the product structure and materials, the present invention provides a cleaning method for a 3D printed product with an A sandwich structure ceramic, including the following steps: S1. Immerse the workpiece in a cleaning liquid containing nano-bubble nuclei, apply phase-modulated ultrasonic waves with a matching frequency for ultrasonic cavitation cleaning; S2. Blow the inner wall of the workpiece from multiple angles with pulsed air flow; S3. Use a flash dryer to perform negative-pressure flash drying on the workpiece.
[0006] In one embodiment, in step S1, the particle size distribution of the nano-bubble nuclei is D50 ≤ 250 nm.
[0007] In one embodiment, in step S1, the core of the nano-bubble nuclei is a mixed gas of argon and ozone, and the volume ratio of argon to ozone is (8 - 9.5) : (0.5 - 2).
[0008] In one embodiment, in step S1, an ultrasonic transducer array with a phase difference of 120° is used to generate ultrasonic waves for ultrasonic cavitation cleaning.
[0009] In one embodiment, the frequency in step S1 satisfies the following formula:
[0010] In the formula, F is the ultrasonic frequency, in Hz; c is the sound velocity in the cleaning liquid, in m / s; d is the equivalent diameter of the core layer pore channel, in m; D is the depth of the core layer pore channel, in m.
[0011] In one embodiment, in step S2, the Reynolds number of the pulsed gas flow satisfies 4000 ≤ Re ≤ 8000.
[0012] In one embodiment, in step S2, the pulse frequency is 10 Hz to 50 Hz, the pulse width is 0.5 ms to 3 ms, and the pressure is 0.6 MPa to 5 MPa.
[0013] In one embodiment, in step S2, the purging trajectory of the pulsed gas flow is a spiral receding type.
[0014] In one embodiment, the spiral lead angle of the purging trajectory is 30° to 55°.
[0015] In one embodiment, in step S3, the negative pressure for negative pressure flash drying is -60 kPa to -80 kPa, the temperature is 40°C to 70°C, and the drying time is 5 min to 10 min.
[0016] In summary, compared with the prior art, the invention has the following beneficial effects: The cleaning method for the A sandwich structure ceramic 3D printing product provided by the present invention can effectively clean the A sandwich structure ceramic 3D printing product without damaging the product structure and materials through steps such as ultrasonic cavitation cleaning, pulsed gas flow purging, and negative pressure flash drying. At the same time, it also provides an effective cleaning solution for products applicable to other complex honeycomb structures. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0018] Figure 1 It is a schematic diagram of the overall structure of the A sandwich structure ceramic 3D printing product in the prior art; Figure 2 It is a cross-sectional view of the side wall of the shell of an A sandwich structure ceramic 3D printing product in the prior art.
[0019] Reference numerals: 10 - Outer skin; 20 - Core layer; 21 - Honeycomb unit; 30 - Inner skin; 31 - Through hole. Specific embodiments
[0020] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0021] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "inner" and "outer" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.
[0022] The present invention Figure 1 is an A sandwich structure ceramic 3D printing product, which is integrally in a conical shell structure. The side wall of the shell is an A sandwich structure, including an outer skin 10, a core layer 20 and an inner skin 30. Among them, through holes 31 are provided on the inner skin 30, and the core layer 20 is a honeycomb structure. Refer to Figure 2 as shown, the honeycomb units 21 communicate with each other and communicate with the through holes 31.
[0023] Embodiment 1 This embodiment provides a cleaning method for an A sandwich structure ceramic 3D printing product, including the following steps: S1. Immerse the workpiece in a cleaning liquid containing nano-bubble nuclei, apply phase-modulated ultrasonic waves with a matching frequency, and perform ultrasonic cavitation cleaning; S2. Blow the inner wall of the workpiece from multiple angles with pulsed air flow; S3. Use a flash dryer to perform negative pressure flash drying on the workpiece.
[0024] Specifically, in this embodiment, in step S1, the particle size distribution of the nano-bubble nuclei is D50 ≤ 250 nm; during specific operation, the cavitation effect is stronger and more uniform. At the same time, small bubbles can penetrate into micron-sized gaps and blind holes, with fewer cleaning dead corners and good micro-area cleaning effects.
[0025] Preferably, in this embodiment, the core of the nanobubble nucleus is a mixed gas obtained by mixing argon and ozone in a volume ratio of 9:1. Specifically, during operation, the inert gas argon carries ozone as the gas core, and ozone can decompose organic pollutants, thereby obtaining a synergistic ultrasonic chemical effect.
[0026] Specifically, in this embodiment, in step S1, an ultrasonic transducer array with a phase difference of 120° is used to generate ultrasonic waves for ultrasonic cavitation cleaning. At the same time, the frequency satisfies the following formula:
[0027] In the formula, F is the ultrasonic frequency, in Hz; c is the sound velocity in the cleaning liquid, in m / s; d is the equivalent diameter of the core layer pore channel, in m; D is the depth of the core layer pore channel, in m. Among them, the sound velocity in the cleaning liquid can be directly measured by a sound velocity measuring instrument, and the equivalent diameter of the pore channel is the diameter of the circumscribed circle.
[0028] Furthermore, in this embodiment, in step S2, the pulsed gas flow is a pulsed Taylor vortex gas flow, and the Reynolds number satisfies 4000 ≤ Re ≤ 8000. Preferably, the pulse frequency is 10 Hz, the pulse width is 1 ms, and the pressure is 1.2 MPa; During specific operation, it blows from the inner cone top to the cone bottom of the shell in a spiral retreating blowing trajectory to blow out the residual liquid after ultrasonic cavitation cleaning. Preferably, the spiral lead angle of the blowing trajectory is 45°.
[0029] Furthermore, in this embodiment, in step S3, the negative pressure for negative pressure flash drying is -60 kPa, the temperature is 40 °C, and the drying time is 8 min.
[0030] Although terms such as A sandwich layer, A-type sandwich layer, nanobubble nucleus, phase-modulated ultrasonic wave, ultrasonic cavitation cleaning, pulsed gas flow, negative pressure flash drying, ultrasonic transducer array, core layer pore channel, equivalent diameter, spiral retreating, spiral lead angle, missile nose cone, high wave transmission performance, high temperature resistance performance, high structural strength, light weight, high strength, core layer, honeycomb core layer, inner skin, outer skin, conical shell, shell side wall, cone top, rounded rectangular through hole, honeycomb structure, and honeycomb unit are used more in this article, the possibility of using other terms is not excluded. These terms are only used to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.
[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A cleaning method for a ceramic 3D printing product with an A sandwich structure, characterized in that It includes the following steps: S1. Immerse the workpiece in the cleaning liquid containing nano-bubble nuclei, apply phase-modulated ultrasonic waves with a matching frequency, and perform ultrasonic cavitation cleaning; S2. Use pulsed air flow to blow the inner wall of the workpiece from multiple angles; S3. Use a flash dryer to perform negative-pressure flash drying on the workpiece.
2. The cleaning method of the A sandwich structure ceramic 3D printing product according to claim 1, characterized in that: In step S1, the particle size distribution of the nano-bubble nuclei is D50 ≤ 250 nm.
3. The cleaning method of the A-interlayer structure ceramic 3D printing product according to claim 2, wherein: In step S1, the inner core of the nano-bubble nuclei is a mixed gas of argon and ozone, and the volume ratio of argon to ozone is (8 - 9.5):(0.5 - 2).
4. The cleaning method of the A-interlayer structure ceramic 3D printing product according to claim 3, wherein: In step S1, three ultrasonic transducer arrays with a phase difference of 120° are used to generate ultrasonic waves for ultrasonic cavitation cleaning.
5. The cleaning method of the A sandwich structure ceramic 3D printing product according to claim 4, characterized in that, The frequency in step S1 satisfies the following formula: In the formula, F is the ultrasonic frequency, Hz; c is the sound velocity in the cleaning liquid, m / s; d is the equivalent diameter of the core layer pore channel, m; D is the depth of the core layer pore channel, m.
6. The cleaning method of the A sandwich structure ceramic 3D printing product according to claim 5, characterized in that: In step S2, the fluid Reynolds number of the pulsed air flow satisfies 4000 ≤ Re ≤ 8000.
7. The cleaning method of the A sandwich structure ceramic 3D printing product according to claim 6, characterized in that: In step S2, the pulse frequency is 10 Hz - 50 Hz, the pulse width is 0.5 ms - 3 ms, and the pressure is 0.6 MPa - 5 MPa.
8. The cleaning method of the A sandwich structure ceramic 3D printing product according to claim 7, characterized in that: In step S2, the blowing track of the pulsed air flow is a spiral receding type.
9. The cleaning method of the A-interlayer structure ceramic 3D printing product according to claim 8, characterized in that: The spiral lead angle of the blowing track is 30° - 55°.
10. The cleaning method of the A sandwich structure ceramic 3D printing product according to claim 9, characterized in that: In step S3, the negative pressure of the negative-pressure flash drying is -60 kPa - -80 kPa, the temperature is 40°C - 70°C, and the drying time is 5 min - 10 min.