CN117818047A - Powder cleaning device for thrust chamber and method for cleaning residual powder in inner runner - Google Patents
Powder cleaning device for thrust chamber and method for cleaning residual powder in inner runner Download PDFInfo
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- CN117818047A CN117818047A CN202311625126.3A CN202311625126A CN117818047A CN 117818047 A CN117818047 A CN 117818047A CN 202311625126 A CN202311625126 A CN 202311625126A CN 117818047 A CN117818047 A CN 117818047A
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- powder
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- 239000000843 powder Substances 0.000 title claims abstract description 142
- 238000004140 cleaning Methods 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 45
- 239000002184 metal Substances 0.000 claims abstract description 76
- 238000007789 sealing Methods 0.000 claims abstract description 66
- 238000007664 blowing Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 37
- 238000001514 detection method Methods 0.000 claims description 22
- 239000004744 fabric Substances 0.000 claims description 21
- 238000011010 flushing procedure Methods 0.000 claims description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 230000006835 compression Effects 0.000 claims description 12
- 238000007906 compression Methods 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 11
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 8
- 230000007547 defect Effects 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000003995 emulsifying agent Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 230000035515 penetration Effects 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 4
- 238000000137 annealing Methods 0.000 claims description 3
- 238000000861 blow drying Methods 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 239000011859 microparticle Substances 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 238000010146 3D printing Methods 0.000 abstract description 2
- 238000003825 pressing Methods 0.000 description 5
- 230000003749 cleanliness Effects 0.000 description 4
- 230000002950 deficient Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
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- 239000012530 fluid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
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Abstract
The invention relates to the technical field of 3D printing and discloses a powder cleaning device for a thrust chamber and a cleaning method for residual powder in an inner runner. The cleaning method comprises the following steps: cleaning the surface of the thrust chamber and the residual metal powder of the inner runner; vibrating the thrust chamber to loosen residual metal powder in the inner runner; installing a sealing ring, enabling the opening to be communicated with one inner runner, closing other inner runners by the sealing ring, sealing the first runner port, injecting clean and dry compressed air from the second runner port until the unsealed inner runner is free of metal powder to blow out; and rotating the sealing ring to ensure that the opening is opposite to the next internal flow passage, and repeating the previous step until all the internal flow passages are free from metal powder blowing. The cleaning effect is better, and the cleaning efficiency is higher.
Description
Technical Field
The invention relates to the technical field of 3D printing, in particular to a powder cleaning device for a thrust chamber and a method for cleaning residual powder in an inner runner.
Background
Selective laser melting (Selective Laser Melting, SLM) technology is an advanced laser additive manufacturing technology developed based on prototype manufacturing technology as a basic principle. However, when the selected area laser melting forming equipment prints the product, the adopted raw material is metal powder, so that a large amount of residual powder remains and adheres to the inner surface and the outer surface of the formed part, and particularly for a thrust chamber with a large amount of inner flow passages inside, a large amount of metal powder remains in the flow passages in the formed thrust chamber. Therefore, the residual powder needs to be cleaned up in time after printing is finished, and the phenomenon that the residual metal powder is coagulated into blocks after subsequent heat treatment and mechanical processing is avoided, so that the cleaning cannot be performed, and the part is scrapped is avoided.
In the prior art, a clean gas and a water flow are generally adopted to flush the inner flow passage, and then whether residual powder exists at the outlet of the flow passage is detected. However, due to the fact that the flow passage in the thrust chamber is compact, the structure is complex, the volume is large, and the surface has certain roughness, powder is easy to adhere to the inner surface of the inner flow passage, and slag is easy to hang; and the pressure, the flow speed and the flow resistance of the air flow and the water flow in the complex flow channel are inconsistent, so that the compressed air blowing, the ultrasonic cleaning and the high-pressure water flushing can only remove the completely unmelted metal powder on the surface of the part and the inner surface of the flow channel, the cleaning effect on the powder sticking and the slag hanging on the inner surface of the flow channel is poor, the cleaning effect on each inner flow channel cannot be ensured, the tiny flow channel is blocked by residual powder after the part is dried, and the part is scrapped.
Therefore, there is a need for a powder cleaning device for a thrust chamber and a method for cleaning residual powder in an inner flow path to solve the above problems.
Disclosure of Invention
Based on the above, the invention aims to provide a powder cleaning device for a thrust chamber and a cleaning method for residual powder in an inner runner, which have better cleaning effect and higher cleaning efficiency.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a powder cleaning device for a thrust chamber, comprising:
the sealing ring is provided with an opening, can be attached to the outlet end of the inner flow passage of the thrust chamber and seals the outlet end of the inner flow passage, and the opening can be opposite to and communicated with the outlet of one inner flow passage.
As a preferable embodiment of the powder cleaning device for a thrust chamber, further comprising:
the compression ring can be in compression joint with the end part of the thrust chamber, and the compression ring is propped against the outlet end of the inner flow passage of the thrust chamber.
As a preferable embodiment of the powder cleaning device for a thrust chamber, further comprising:
and the clamping piece is detachably connected with the pressure ring and the thrust chamber and is used for clamping or loosening the pressure ring and the thrust chamber.
The method for cleaning the residual powder in the flow passage in the thrust chamber based on the powder cleaning device for the thrust chamber according to any one of the above technical solutions, wherein the thrust chamber is provided with a first flow passage opening and a second flow passage opening which are communicated with the inner flow passage, and the method for cleaning the residual powder in the flow passage in the thrust chamber comprises the following steps:
primary powder cleaning: placing the thrust chamber on a workbench, and cleaning the surface of the thrust chamber and residual metal powder of an inner runner;
vibration: the thrust chamber is arranged on a vibrating table, and the vibrating table is started to loosen residual metal powder in the inner runner;
secondary powder cleaning: installing the sealing rings so that the opening is directly communicated with one inner runner, closing the first runner by the sealing rings, injecting clean and dry compressed air from the second runner until the unsealed inner runner is free of metal powder to blow out;
rotating the sealing ring to enable the opening to be opposite to be communicated with the next inner runner, and injecting clean and dry compressed air from the second runner port until the unsealed inner runner is blown out of metal powder;
and repeating the previous step until all the inner flow passages are free of metal powder.
As a preferable scheme of the cleaning method for the residual powder in the flow passage in the thrust chamber, the primary powder cleaning method comprises the following steps:
placing the thrust chamber on a workbench, cleaning residual metal powder on the surface of the thrust chamber by using a brush and a dust collector, and blowing clean and dry compressed air to clean the metal powder on the surface of the thrust chamber;
the first flow passage opening is blocked, clean and dry compressed air is injected and blown out from the second flow passage opening until no metal powder is blown out from the inner flow passage of the thrust chamber;
and sealing the second flow passage opening, injecting and blowing clean and dry compressed air from the first flow passage opening until no metal powder is blown out from the inner flow passage of the thrust chamber.
As a preferable scheme of the cleaning method of the residual powder in the flow passage in the thrust chamber, the method further comprises the following steps after the secondary powder cleaning:
x-ray primary detection: adopting X-rays to irradiate the thrust chamber, detecting whether the interior of the inner runner is uneven or metal powder remains, repeating the previous steps if the interior of the inner runner is uneven or metal powder remains, and carrying out the next step if the detection is qualified;
and (3) heat treatment: annealing the thrust chamber;
fluorescence penetration flaw detection: cleaning the surface of the thrust chamber by using carbon tetrachloride solution, removing dirt and greasy dirt, coating fluorescent liquid on the surface of the thrust chamber, standing for a first preset time, coating an emulsifying agent on the surface of the thrust chamber, flushing the emulsifying agent on the surface of the thrust chamber by using flowing water, wiping cleanly by using cloth, coating a layer of developing agent on the surface of the thrust chamber, placing the thrust chamber under an ultraviolet fluorescent flaw detection lamp, judging whether the thrust chamber has defects, and if the thrust chamber has defects, carrying out next cleaning, and if the thrust chamber has defects, carrying out reworking treatment or scrapping.
As a preferable mode of the method for cleaning the residual powder in the flow passage in the thrust chamber, after the fluorescent penetration flaw detection is carried out, if the thrust chamber is free from defects, the following steps are carried out:
and (3) water particle flow treatment: treating the inner flow path for a second preset time by adopting a microparticle liquid abrasive;
ultrasonic cleaning: and completely immersing the thrust chamber in deionized water for ultrasonic cleaning for a third preset time.
As a preferable scheme of the cleaning method for the residual powder in the flow passage in the thrust chamber, the method further comprises the following steps after the ultrasonic cleaning:
flushing: installing the sealing rings, enabling the opening to be in opposite communication with one inner flow passage, closing other inner flow passages by the sealing rings, sealing the first flow passage, injecting high-pressure water from the second flow passage, and observing that water flows out of the opening and no metal powder flows out;
rotating the sealing ring to enable the opening to be opposite to the next internal flow passage, injecting high-pressure water from the second flow passage opening, and observing that water flows out of the opening and no metal powder flows out;
and repeating the previous step until all the internal flow channels have water flow out and no metal powder flows out.
As a preferable scheme of the cleaning method for the residual powder in the flow passage in the thrust chamber, the method further comprises the following steps after the flushing step:
blow-drying: injecting clean and dry compressed air into the inner flow passage of the thrust chamber through the first flow passage opening and the second flow passage opening respectively to blow out water in the inner flow passage;
and (3) drying: and placing the thrust chamber in an inverted mode, and drying the thrust chamber at the first preset temperature for a fourth preset time.
As a preferable scheme of the cleaning method for the residual powder in the flow passage in the thrust chamber, the method further comprises the following steps after the thrust chamber is dried:
and (3) detecting residual blowing: installing the sealing rings, enabling the opening to be in opposite communication with one inner runner, closing other inner runners by the sealing rings, wrapping clean dust-free cloth at the opening, sealing the first runner port, injecting clean high-purity nitrogen from the second runner port, detecting the dust-free cloth by using an amplifying lens, and observing whether the dust-free cloth has redundant substances or not;
rotating the sealing ring to enable the opening to be opposite to the inner runner connected with the next inner runner, injecting high-purity nitrogen from the second runner opening, detecting the dust-free cloth by using a magnifying glass, if no surplus substances exist on the dust-free cloth, indicating that no residual metal powder exists in the inner runner, and observing whether the dust-free cloth has the surplus substances or not;
repeating the previous step until the internal flow passage is inspected;
x-ray secondary detection: and (3) adopting X-rays to irradiate the thrust chamber, and detecting whether metal powder remains in the inner flow path.
The beneficial effects of the invention are as follows:
the invention provides a powder cleaning device for a thrust chamber, which is characterized in that an outlet of an inner runner is sealed through a sealing ring, and the outlet of one inner runner is communicated, so that the inner runners can be cleaned one by one when being washed and cleaned, each inner runner is ensured to be cleaned, and stable working pressure can be kept when the inner runners are washed and cleaned, so that the cleaning cleanliness of each inner runner is improved, and the scrapping of the thrust chamber caused by the blockage of the tiny runners by residual metal powder is avoided; meanwhile, whether each inner runner is smooth or not can be rapidly known by cleaning the inner runners one by one, so that the inner runners can be processed or scrapped in a targeted mode, and the waste of subsequent procedures and time is avoided.
The invention also provides a method for cleaning the residual powder in the flow passage in the thrust chamber, which is characterized in that the metal powder in the inner flow passage is loosened by vibration, so that the cleaning effect is improved, then only one inner flow passage is opened each time by the sealing ring, and the inner flow passages are purged one by adopting compressed air, so that the purging pressure is ensured during cleaning, each inner flow passage is ensured to be cleaned, and the quality of the thrust chamber is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings needed in the description of the embodiments of the present invention, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the contents of the embodiments of the present invention and these drawings without inventive effort for those skilled in the art.
FIG. 1 is a schematic view of a powder cleaning device for a thrust chamber according to an embodiment of the present invention;
FIG. 2 is an exploded view of a powder cleaning device for a thrust chamber according to an embodiment of the present invention assembled to the thrust chamber;
FIG. 3 is a schematic view of a thrust chamber according to an embodiment of the present invention;
FIG. 4 is an enlarged view of portion A of FIG. 3;
FIG. 5 is a schematic view of a seal ring assembled to a thrust chamber according to an embodiment of the present invention;
FIG. 6 is an enlarged view of portion B of FIG. 5;
FIG. 7 is a flowchart of a method for cleaning residual powder in a flow passage in a thrust chamber according to an embodiment of the present invention;
fig. 8 is a second flowchart of a method for cleaning residual powder in a flow passage in a thrust chamber according to an embodiment of the present invention.
In the figure:
1. a body; 10. an inner flow passage; 11. an annular step surface; 101. a first fluid port; 102. a second fluid port; 2. a seal ring; 20. an opening; 3. and a compression ring.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
As shown in fig. 1 to 5, the present embodiment provides a powder cleaning device for a thrust chamber, the thrust chamber includes a main body 1, a plurality of inner flow passages 10 are formed in a peripheral wall of the main body 1, the inner flow passages 10 are uniformly arranged at intervals along a circumferential direction of the main body 1, a first flow passage opening 101 and a second flow passage opening 102 which are communicated with inlet ends of all the inner flow passages 10 are further arranged on the main body 1, an annular step surface 11 is formed on an inner wall of one end of the main body 1, and outlets of all the inner flow passages 10 penetrate through the annular step surface 11. Specifically, the powder cleaning device for the thrust chamber comprises a sealing ring 2, wherein the sealing ring 2 is provided with an opening 20, the sealing ring 2 can be attached to the outlet end of an inner flow passage 10 of the thrust chamber and can seal the outlet end of the inner flow passage 10, and the opening 20 can be opposite to the outlet communicated with one inner flow passage 10. The sealing ring 2 is specifically attached to the annular step surface 11, and is used for simultaneously blocking all other outlets of the inner flow channels 10 except for the outlet of one inner flow channel 10 opposite to the opening 20. The outlet of the inner runner 10 is sealed through the sealing ring 2, and the outlet of one inner runner 10 is communicated, so that the inner runners 10 can be cleaned one by one when being washed and cleaned, each inner runner 10 is ensured to be cleaned, and stable working pressure can be kept when the inner runners 10 are purged and cleaned, so that the cleaning cleanliness of each inner runner 10 is improved, and the scrapping of a thrust chamber caused by the blockage of the tiny runners by residual metal powder is avoided.
More specifically, as shown in fig. 1 and 2, the powder cleaning device for a thrust chamber further includes a pressing ring 3, and the pressing ring 3 can be pressed against the end of the thrust chamber and press the sealing ring 2 against the outlet end of the inner flow passage 10 of the thrust chamber. After the sealing ring 2 is placed on the annular step surface 11 and the opening 20 is opposite to the outlet of the internal runner 10, the pressure ring 3 is pressed at the end part of the thrust chamber, so that the sealing ring 2 is limited between the pressure ring 3 and the annular step surface 11, the stability of the sealing ring 2 is ensured, and cleaning errors caused by displacement of the sealing ring 2 in the cleaning process of the internal runner 10 are avoided.
Preferably, the shape of the compression ring 3 is the same as that of the sealing ring 2, and the compression ring 3 is also provided with an opening so as to avoid the smoothness of the inner runner 10 being influenced by the closing of the opening 20 on the sealing ring 2 when the compression ring 3 is in compression joint with the sealing ring 2.
In this embodiment, the pressure ring 3 is fixed on the thrust chamber by a clamping member, and the clamping member is detachably connected to the pressure ring 3 and the thrust chamber, for clamping or unclamping the pressure ring 3 and the thrust chamber. After the sealing ring 2 is placed in place, the pressing ring 3 is placed, and then the clamping piece clamps the pressing ring 3, so that the position of the pressing ring 3 is fixed, namely the position of the sealing ring 2 is fixed, and the cleaning process of the inner runner 10 is ensured to be smooth and steady; after one of the internal flow paths 10 is cleaned, the clamping member is released, the pressure ring 3 is taken off, the sealing ring 2 is rotated so that the opening 20 is aligned with the outlet of the next internal flow path 10, and then the pressure ring 3 is placed again to clamp the clamping member.
Illustratively, the clamping member comprises at least one C-shaped clamp, the clamping ring 3 and the end part of the thrust chamber are clamped from the side by the C-shaped clamp, the operation is simple and convenient, the position of the sealing ring 2 is easy to adjust, and the time is saved. Preferably, a plurality of C-shaped clamps are arranged, and the plurality of C-shaped clamps are clamped at intervals along the circumference of the end part of the thrust chamber, so that the compression ring 3 is uniformly stressed, the position stability of the sealing ring 2 is ensured, for example, the C-shaped clamps are provided with four or five clamps and the like, and the C-shaped clamps are specifically arranged according to actual requirements.
As shown in fig. 1 to 8, the present embodiment further provides a method for cleaning the residual powder in the flow passage 10 in the thrust chamber, based on the above-mentioned powder cleaning device for the thrust chamber, the method for cleaning the residual powder in the flow passage 10 in the thrust chamber includes the following steps:
s100: primary powder cleaning: the thrust chamber is placed on a table and cleaned of residual metal powder on the thrust chamber surface and in the inner flow path 10.
Preferably, the method further comprises the steps of:
s101:3D prints thrust chamber processing: the thrust chamber parts are manufactured from the printer by paving metal powder on a powder bed and adopting a selective laser melting forming mode.
After the thrust chamber part is processed, the residual metal powder on the thrust chamber part is required to be cleaned, and the step of cleaning the powder once specifically comprises the following steps:
s102: keeping the thrust chamber part on a powder bed, primarily cleaning and recovering metal powder on the surface of the thrust chamber part by using a hairbrush, opening a printer cabin door, taking out the thrust chamber part from a printer and placing the thrust chamber part on an open workbench, cleaning residual metal powder on the surface of the thrust chamber part by using the hairbrush and a dust collector, and blowing clean and dry compressed air to clean the metal powder on the surface of the thrust chamber part;
s103: the first flow passage opening 101 is blocked, clean and dry compressed air is injected and blown out from the second flow passage opening 102 until no metal powder is blown out from the inner flow passage 10 of the thrust chamber;
s104: the second flow passage opening 102 is closed, and clean and dry compressed air is injected and blown out from the first flow passage opening 101 until no metal powder is blown out from the inner flow passage 10 of the thrust chamber.
By cleaning the outside and the inside of the thrust chamber by purging, most of the metal powder on the outer surface of the thrust chamber and the inner flow passage 10 is cleaned, so that the time for subsequent fine cleaning is saved, and the cleaning efficiency is improved.
Further, after the primary powder cleaning is completed, the method further comprises the steps of:
s200: vibration: the thrust chamber is mounted on the vibrating table and the vibrating table is activated to loosen the residual metal powder in the inner flow path 10.
After the powder cleaning is finished, the thrust chamber part and the base plate are fixed on the vibration table together by using a plurality of screws, for example, 4M 10 screws (the screw length is determined according to the thickness of the base plate) are fixed on the vibration table, and then random vibration in the X, Y, Z direction is carried out, so that residual metal powder in the inner flow channel 10 is loosened, the vibration frequency is 100 Hz-500 Hz, and the single vibration time lasts for 3 minutes. The metal powder with stronger adhesive force in the inner runner 10 is fallen off by vibration, so that the cleaning effect is improved. The number of screws and the time of the single vibration are not limited, and are specifically set according to practical requirements, for example, the number of screws is 5 or 6, and the time of the single vibration lasts for 4 minutes or 5 minutes.
S300: secondary powder cleaning: s301: installing the sealing ring 2 so that the opening 20 is in opposite communication with one inner runner 10, sealing other inner runners 10 by the sealing ring 2, sealing the first runner port 101, injecting clean and dry compressed air from the second runner port 102 until the unsealed inner runner 10 is blown out without metal powder;
s302: rotating the sealing ring 2 so that the opening 20 is opposite to be communicated with the next internal flow channel 10, injecting clean and dry compressed air from the second flow channel opening 102 until the unsealed internal flow channel 10 is blown out of metal powder;
s303: the above steps are repeated until all the inner flow channels 10 are free from metal powder.
Here, the second flow passage opening 102 may be closed, and compressed air may be injected from the first flow passage opening 101.
The outlet of the inner flow passage 10 is sealed through the sealing ring 2, and the outlet of one inner flow passage 10 is left to be communicated, so that the inner flow passages 10 can be cleaned one by one when being washed and cleaned, each inner flow passage 10 is ensured to be cleaned, and stable working pressure can be kept when the inner flow passages 10 are purged and cleaned, so that the cleaning cleanliness of each inner flow passage 10 is improved, and the scrapping of a thrust chamber caused by the blockage of a tiny flow passage by residual metal powder is avoided; meanwhile, whether each inner runner 10 is smooth or not can be quickly known by cleaning the inner runners 10 one by one, so that targeted treatment or scrapping can be conveniently carried out, and the waste of subsequent procedures and time is avoided.
After twice powder cleaning is carried out on the flow passages 10 in the thrust chamber, each inner flow passage 10 is ensured to be unblocked, and then the thrust chamber is subjected to heat treatment, which specifically comprises the following steps:
s400: x-ray primary detection: the thrust chamber is irradiated with X-rays to detect whether there is unevenness or metal powder remaining in the inner flow passage 10, if there is unevenness or metal powder remaining in the inner flow passage 10, the previous steps are repeated, and if the detection is qualified, the next step is performed. By X-ray detection, it is clearly known whether or not metal powder remains in each of the inner flow passages 10, and the scrapping of thrust chamber parts caused by the agglomeration of metal powder into blocks during heat treatment is avoided.
S500: and (3) heat treatment: annealing the thrust chamber;
s600: fluorescence penetration flaw detection: cleaning the surface of a thrust chamber by using carbon tetrachloride solution, removing dirt and greasy dirt, coating fluorescent liquid on the surface of the thrust chamber, standing for a first preset time, coating an emulsifying agent on the surface of the thrust chamber, flushing the emulsifying agent on the surface of the thrust chamber by using flowing water, wiping cleanly by using cloth, coating a layer of developing agent on the surface of the thrust chamber, placing the thrust chamber under an ultraviolet fluorescent flaw detection lamp, judging whether the thrust chamber is defective, and if the thrust chamber is defective, carrying out next cleaning, and if the thrust chamber is defective, carrying out reworking treatment or scrapping. And after heat treatment, flaw detection is carried out on the thrust chamber, so that the quality of a finished product is ensured, and defective products or scrapped products are prevented from flowing into subsequent production procedures.
Wherein the first preset time is 20min-30min, for example, the first preset time is 20min, 25min or 30min, etc.
In order to improve the surface roughness in the inner flow passage 10, the method further comprises the following steps after flaw detection:
s700: and (3) water particle flow treatment: treating the inner flow path 10 with the fine particle liquid abrasive for a second preset time;
wherein, liquid abrasive is adopted as CSI particles, the water particle flow pressure is 0.4MPa-0.5MPa, and the second preset time is 4min-5min. The inner runner 10 is washed by the liquid grinding material of the microparticles, so that the surface of the inner runner 10 is polished, and the surface roughness of the inner runner 10 is reduced.
S800: ultrasonic cleaning: and completely immersing the thrust chamber in deionized water for ultrasonic cleaning for a third preset time.
The third preset time is 1h-2h, for example, 1h, 1.5h and 2h are needed to be cleaned by ultrasonic waves, and the third preset time is specifically set according to actual requirements.
The ultrasonic cleaning is used for cleaning the metal powder and the abrasive which are polished and dropped in the inner runner 10, so that the inner runner 10 is prevented from being blocked, and the subsequent cleaning is convenient.
Further, after the ultrasonic cleaning, the method further comprises the following steps:
s900: flushing: installing the sealing ring 2 so that the opening 20 is directly communicated with one inner runner 10, sealing other inner runners 10 by the sealing ring 2, sealing the first runner port 101, injecting high-pressure water from the second runner port 102, and observing that water flows out of the opening 20 and no metal powder flows out;
rotating the sealing ring 2 so that the opening 20 is opposite to be communicated with the next internal flow channel 10, injecting high-pressure water from the second flow channel opening 102, observing that water flows out of the opening 20 and no metal powder flows out;
the above steps are repeated until all the inner flow channels 10 have water flow and no metal powder flows.
Wherein the pressure of the high-pressure water is 1MPa to 2MPa, for example, the pressure of the high-pressure water is 1MPa, 1.5MPa or 2MPa.
The presence of water flow indicates that the inner flow passage 10 is not blocked, i.e., the flow passage is clear, and if metal powder flows out, it indicates that metal powder remains in the inner flow passage 10, and the flushing is continued until no metal powder flows out. By flushing each inner flow passage 10, the metal powder and the abrasive in each inner flow passage 10 are flushed out, and each inner flow passage 10 is flushed independently, so that the stable flushing pressure and the flushing cleanliness can be effectively ensured.
After flushing, the surface of the thrust chamber and the inner runner 10 are subjected to residual water, and the residual water is required to be dried, and the method specifically comprises the following steps:
s1000: blow-drying: the clean and dry compressed air is used for blowing the washed thrust chamber, the clean and dry compressed air is respectively injected into the inner flow passage 10 of the thrust chamber through the first flow passage opening 101 and the second flow passage opening 102, and water in the inner flow passage 10 is blown out;
s2000: and (3) drying: and placing the thrust chamber in an inverted mode, and drying the thrust chamber for a fourth preset time at the first preset temperature. The water in the inner runner 10 can flow out conveniently by standing upside down, so that the drying time is saved, and the complete drying of the thrust chamber is ensured.
The moisture on the surface of the thrust chamber and the inner runner 10 is blown away, so that the drying time is saved, and the cleaning efficiency is improved.
Wherein the first preset temperature is 80-90 ℃, for example, the first preset temperature is 80 ℃, 85 ℃ or 90 ℃, etc., the fourth preset time is 6-8 h, for example, the fourth preset time is 6h, 7h or 8h, etc.
In order to ensure the quality of the thrust chamber, the method further comprises the following steps after drying the thrust chamber:
s3000: and (3) detecting residual blowing: installing the sealing ring 2 so that the opening 20 is communicated with one inner runner 10, sealing other inner runners 10 by the sealing ring 2, wrapping clean dust-free cloth at the opening 20, sealing the first runner port 101, injecting clean high-purity nitrogen from the second runner port 102, detecting the dust-free cloth by using an magnifying glass, and observing whether the dust-free cloth has redundant substances;
rotating the sealing ring 2 so that the opening 20 is opposite to be communicated with the next inner runner 10, injecting high-purity nitrogen from the second runner opening 102, detecting dust-free cloth by using a magnifying glass, if no surplus substances exist on the dust-free cloth, indicating that no residual metal powder exists in the inner runner 10, and observing whether the dust-free cloth has the surplus substances or not;
repeating the previous step until the inspection of the inner runner 10 is completed;
through detecting every internal runner 10, can learn accurately and fast whether there is the metal powder residue in every internal runner 10 to carry out the targeted reclassifying to the internal runner 10 that has the metal powder residue, compare in prior art to all internal runners 10 sweep simultaneously and detect, the accuracy is better, is convenient for reclassify fast, saves time, improves product quality.
S4000: x-ray secondary detection: the thrust chamber is irradiated with X-rays to detect whether or not metal powder remains in the inner flow passage 10.
Through the unnecessary material blow-off detection, X-ray detection times are saved, cost is saved, detection efficiency is high, and the method is convenient for quickly detecting which inner runner 10 still has metal powder residues, and is used for cleaning up purposefully, so that the quality of the cleaned thrust chamber is ensured.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. A powder cleaning device for a thrust chamber, comprising:
the sealing ring is provided with an opening, can be attached to the outlet end of the inner flow passage of the thrust chamber and seals the outlet end of the inner flow passage, and the opening can be opposite to and communicated with the outlet of one inner flow passage.
2. The powder cleaning apparatus for a thrust chamber according to claim 1, further comprising:
the compression ring can be in compression joint with the end part of the thrust chamber, and the compression ring is propped against the outlet end of the inner flow passage of the thrust chamber.
3. The powder cleaning apparatus for a thrust chamber according to claim 2, further comprising:
and the clamping piece is detachably connected with the pressure ring and the thrust chamber and is used for clamping or loosening the pressure ring and the thrust chamber.
4. A method for cleaning the residual powder in the flow passage in the thrust chamber based on the powder cleaning device for the thrust chamber according to any one of claims 1 to 3, the thrust chamber having a first flow passage opening and a second flow passage opening communicating with the inner flow passage, characterized in that the method for cleaning the residual powder in the flow passage in the thrust chamber comprises the steps of:
primary powder cleaning: placing the thrust chamber on a workbench, and cleaning the surface of the thrust chamber and residual metal powder of an inner runner;
vibration: the thrust chamber is arranged on a vibrating table, and the vibrating table is started to loosen residual metal powder in the inner runner;
secondary powder cleaning: installing the sealing rings so that the opening is directly communicated with one inner runner, closing the first runner by the sealing rings, injecting clean and dry compressed air from the second runner until the unsealed inner runner is free of metal powder to blow out;
rotating the sealing ring to enable the opening to be opposite to be communicated with the next inner runner, and injecting clean and dry compressed air from the second runner port until the unsealed inner runner is blown out of metal powder;
and repeating the previous step until all the inner flow passages are free of metal powder.
5. The method for cleaning residual powder in a thrust chamber according to claim 4, wherein the primary cleaning comprises the steps of:
placing the thrust chamber on a workbench, cleaning residual metal powder on the surface of the thrust chamber by using a brush and a dust collector, and blowing clean and dry compressed air to clean the metal powder on the surface of the thrust chamber;
the first flow passage opening is blocked, clean and dry compressed air is injected and blown out from the second flow passage opening until no metal powder is blown out from the inner flow passage of the thrust chamber;
and sealing the second flow passage opening, injecting and blowing clean and dry compressed air from the first flow passage opening until no metal powder is blown out from the inner flow passage of the thrust chamber.
6. The method for cleaning residual powder in a thrust chamber according to claim 4, further comprising the steps of, after said secondary cleaning:
x-ray primary detection: adopting X-rays to irradiate the thrust chamber, detecting whether the interior of the inner runner is uneven or metal powder remains, repeating the previous steps if the interior of the inner runner is uneven or metal powder remains, and carrying out the next step if the detection is qualified;
and (3) heat treatment: annealing the thrust chamber;
fluorescence penetration flaw detection: cleaning the surface of the thrust chamber by using carbon tetrachloride solution, removing dirt and greasy dirt, coating fluorescent liquid on the surface of the thrust chamber, standing for a first preset time, coating an emulsifying agent on the surface of the thrust chamber, flushing the emulsifying agent on the surface of the thrust chamber by using flowing water, wiping cleanly by using cloth, coating a layer of developing agent on the surface of the thrust chamber, placing the thrust chamber under an ultraviolet fluorescent flaw detection lamp, judging whether the thrust chamber has defects, and if the thrust chamber has defects, carrying out next cleaning, and if the thrust chamber has defects, carrying out reworking treatment or scrapping.
7. The method of cleaning residual powder in a flow path in a thrust chamber according to claim 6, wherein after performing the fluorescent penetration inspection, if the thrust chamber is defect-free, the steps of:
and (3) water particle flow treatment: treating the inner flow path for a second preset time by adopting a microparticle liquid abrasive;
ultrasonic cleaning: and completely immersing the thrust chamber in deionized water for ultrasonic cleaning for a third preset time.
8. The method of cleaning residual powder in a thrust chamber according to claim 7, further comprising the steps of, after said ultrasonic cleaning:
flushing: installing the sealing rings, enabling the opening to be in opposite communication with one inner flow passage, closing other inner flow passages by the sealing rings, sealing the first flow passage, injecting high-pressure water from the second flow passage, and observing that water flows out of the opening and no metal powder flows out;
rotating the sealing ring to enable the opening to be opposite to the next internal flow passage, injecting high-pressure water from the second flow passage opening, and observing that water flows out of the opening and no metal powder flows out;
and repeating the previous step until all the internal flow channels have water flow out and no metal powder flows out.
9. The method of claim 4, further comprising the step of, after the flushing step:
blow-drying: injecting clean and dry compressed air into the inner flow passage of the thrust chamber through the first flow passage opening and the second flow passage opening respectively to blow out water in the inner flow passage;
and (3) drying: and placing the thrust chamber in an inverted mode, and drying the thrust chamber at the first preset temperature for a fourth preset time.
10. The method of claim 4, further comprising the steps of, after drying the thrust chamber:
and (3) detecting residual blowing: installing the sealing rings, enabling the opening to be in opposite communication with one inner runner, closing other inner runners by the sealing rings, wrapping clean dust-free cloth at the opening, sealing the first runner port, injecting clean high-purity nitrogen from the second runner port, detecting the dust-free cloth by using an amplifying lens, and observing whether the dust-free cloth has redundant substances or not;
rotating the sealing ring to enable the opening to be opposite to the inner runner connected with the next inner runner, injecting high-purity nitrogen from the second runner opening, detecting the dust-free cloth by using a magnifying glass, if no surplus substances exist on the dust-free cloth, indicating that no residual metal powder exists in the inner runner, and observing whether the dust-free cloth has the surplus substances or not;
repeating the previous step until the internal flow passage is inspected;
x-ray secondary detection: and (3) adopting X-rays to irradiate the thrust chamber, and detecting whether metal powder remains in the inner flow path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311625126.3A CN117818047A (en) | 2023-11-30 | 2023-11-30 | Powder cleaning device for thrust chamber and method for cleaning residual powder in inner runner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311625126.3A CN117818047A (en) | 2023-11-30 | 2023-11-30 | Powder cleaning device for thrust chamber and method for cleaning residual powder in inner runner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117818047A true CN117818047A (en) | 2024-04-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311625126.3A Pending CN117818047A (en) | 2023-11-30 | 2023-11-30 | Powder cleaning device for thrust chamber and method for cleaning residual powder in inner runner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117818047A (en) |
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2023
- 2023-11-30 CN CN202311625126.3A patent/CN117818047A/en active Pending
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