CN209793490U - Internal surface polishing tool for horn antenna - Google Patents
Internal surface polishing tool for horn antenna Download PDFInfo
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- CN209793490U CN209793490U CN201920500695.8U CN201920500695U CN209793490U CN 209793490 U CN209793490 U CN 209793490U CN 201920500695 U CN201920500695 U CN 201920500695U CN 209793490 U CN209793490 U CN 209793490U
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Abstract
The utility model provides an inner surface polishing tool of a horn antenna, wherein an upper positioning plate and a lower positioning plate are connected through a sleeve, and the horn antenna is arranged in the sleeve and is arranged in the big end of the horn antenna; the side wall of the sleeve is provided with at least two through holes for filling media into the sleeve, and the media are cooled and solidified to tightly wrap the periphery of the horn antenna; the outer wall of the supplement core is the same as the inner wall of the big end of the horn antenna in shape, and a gap is reserved between the outer wall of the supplement core and the inner wall of the big end of the horn antenna; the abrasive particle flow flowing in from the through hole of the lower positioning plate enters the inner surface of the horn antenna and is extruded out from the other end of the horn antenna to the through hole of the upper positioning plate. The utility model discloses can effectually prevent that loudspeaker from producing the structrual damage in the deformation of carrying out abrasive flow when processing, make the abrasive flow make the internal surface grinding volume of the big of loudspeaker, tip when carrying out the grinding keep unanimous.
Description
Technical Field
The invention relates to the field of abrasive particle flow finishing.
Background
The aperture antenna is widely applied to various radar antennas, and is an antenna capable of obtaining high gain, and the horn antenna is the simplest antenna. The antenna can be used as a feed source of a reflector antenna or a lens antenna, a radiation unit of an array antenna, and can also be used as an independent antenna on a microwave relay station or a satellite. The high-gain high-power-consumption broadband. For a horn antenna with a complex structure, processing methods such as electroforming, pure machining, welding of machined parts, 3D printing and the like are commonly adopted. The electroforming method for processing the high-frequency part has the defects of high processing cost and long processing period, and the pure mechanical processing method is limited by processing conditions and has relatively high processing cost, so the processing mode adopted usually is to weld and form a part after mechanical processing.
A standard waveguide and machining part welding method generally comprises the steps of decomposing a horn antenna into a plurality of parts, then machining and pickling the parts, welding and forming after assembling and positioning, and then manually removing a crater to repair a welding line and an opening. However, the manual removal of the internal welding seams and craters of the horn antenna with a complex structure is difficult, manual repair of certain parts is impossible, the quality cannot be guaranteed, the efficiency is extremely low, and welded parts have large deformation and internal craters and have great influence on the electrical performance of microwaves.
The 3D printing technology which is gradually popularized and applied in recent years is applied to microwave devices, and a path is provided for improving the manufacturing precision and the microwave electrical performance of the horn antenna. The 3D printing technology can accurately manufacture products with any geometric shapes, has the advantages of high forming speed, high precision, simple and time-saving processing and the like, and is particularly suitable for horn antennas which are products with high requirements on thin walls, special-shaped inner surfaces, sizes and form and position tolerance precision. 3D prints and to realize the shaping of multiple metal material, at present because 3D printing technology's restriction, the initial surface roughness of 3D printing horn antenna inner chamber all is higher is about RaMore than 6.3 mu m, which can not satisfy the roughness R of the inner surface of the horn antenna paira1.6 μm or less. Therefore, the horn for 3D printing is required to be carried outin the subsequent treatment, because the inside of the horn is of special-shaped, curved and thin-walled structures, the conventional mechanical method or the manual method for grinding the inner surface cannot be adopted, so that the inner surface of the horn antenna needs to be polished by adopting an abrasive flow technology to reduce the roughness of the inner surface of the horn.
The abrasive flow processing technology is a finishing processing technology developed in the last eighties of the United states, and is characterized in that abrasive grains with cutting function and other modifiers are added into a high polymer material to enable the abrasive grains to be suspended in the high polymer material to form a viscoelastic soft abrasive, the abrasive is enabled to continuously flow back and forth under the action of pressure, the abrasive is contacted with a processed surface, and the cutting function is generated to carry out finishing processing. The abrasive flow process has the characteristics of flexibility and fluidity, is easy to contact with the surface of a hole groove with a complex structure, and is particularly suitable for surface finishing of deep holes in an inner cavity and complex molded surfaces. By selecting different kinds of abrasives, particle sizes, densities and medium viscosities, different grinding effects can be obtained.
Due to the structural characteristics of the horn antenna: thin wall, internal surface dysmorphism, the structure is complicated, the inner chamber is penetrating, structural strength is weak, big end size difference is great etc. can not directly use abrasive flow to process the horn antenna, must protect the horn antenna according to the special frock of horn antenna's structural design. Because the size difference of the big end and the small end of the horn antenna is large, if the abrasive flow is directly processed by the abrasive flow, the abrasive flow of the big end and the small end is different, and therefore the grinding amount of the big end and the grinding amount of the small end are inconsistent, a compensation core is required to be arranged in the horn antenna to adjust the abrasive flow of the big end and the small end of the inner cavity of the horn antenna, and the flow ratio cannot exceed 2-3 times at most. Therefore, the polishing tool for the abrasive particle flow on the inner surface of the 3D printed thin-wall special-shaped horn antenna is necessary.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an abrasive flow polishing tool which can be used for polishing the inner surface of a 3D printed thin-wall special-shaped horn antenna.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a 3D prints thin wall dysmorphism horn antenna's internal surface abrasive flow polishing frock, includes top board, lower locating plate, sleeve and mends the core.
The sleeve is a hollow cylinder, the upper positioning plate and the lower positioning plate are connected through the sleeve, the upper positioning plate and the lower positioning plate are respectively sunken on the end surfaces of the opposite ends, and through holes penetrating through the upper positioning plate and the lower positioning plate are formed in the sunken positions; the horn antenna is arranged in the sleeve, and two ends of the horn antenna are respectively positioned at the concave parts of the upper positioning plate and the lower positioning plate; the patch core is arranged in the large end of the horn antenna; the shape of the inner wall of the sleeve is the same as the shape of the horn antenna, and a gap is reserved between the inner wall of the sleeve and the outer wall of the horn antenna; the side wall of the sleeve is provided with at least two through holes for filling a medium into the sleeve, and the medium is cooled and solidified to tightly wrap the periphery of the horn antenna; the outer wall of the supplement core is the same as the inner wall of the big end of the horn antenna in shape, and a gap is reserved between the outer wall of the supplement core and the inner wall of the big end of the horn antenna; a circle of discontinuous gaps are reserved at the connecting position of the lower positioning plate and the large port part of the horn antenna and are used as channels, and abrasive particle flow flowing in from the through hole of the lower positioning plate enters the inner surface of the horn antenna and is extruded from the other end of the horn antenna to the through hole of the upper positioning plate.
A gap is reserved between the outer wall of the supplement core and the inner wall of the large end of the horn antenna, and the gap distance is 0.8-2 mm.
The end face of one end, opposite to the upper positioning plate and the lower positioning plate, is provided with a bulge at the outer edge of the concave part, and the diameter of the bulge part is the same as the inner diameter of the sleeve and is used for positioning the connecting sleeve at the same time.
The medium is low-melting-point alloy with a melting point of 72 ℃, and the medium comprises 50% of bismuth, 25% of lead, 12.5% of tin and 12.5% of cadmium by mass percent.
The invention has the beneficial effects that:
Firstly, a medium is poured on the periphery of the horn, and the horn can be effectively prevented from deforming to generate structural damage during abrasive flow processing after cooling and hardening.
And secondly, the shapes of the bushing installed on the lower positioning plate and the inner surface of the horn are completely similar, the sizes of the bushing and the inner surface of the horn are all smaller than the inner surface of the horn to be processed, the gap can be 0.8-2 mm, a channel is formed between the outer surface of the bushing and the inner surface of the horn to be processed to control the flow rate of the abrasive material inlet and outlet, and the grinding amount of the inner surface of the large end and the small end of the horn is kept consistent when the abrasive flow is ground.
Drawings
Fig. 1 is a schematic sectional view of the assembly of the present invention.
Fig. 2 is an exploded view of the assembly of the present invention.
Fig. 3 is a schematic structural view of an upper positioning plate of the present invention.
Fig. 4 is a schematic view of the sleeve structure of the present invention.
Fig. 5 is a schematic view of the patch core structure of the present invention.
Fig. 6 is a schematic structural view of a lower positioning plate of the present invention.
Fig. 7 is a schematic view of the horn structure of the present invention.
In the figure, 1-abrasive material, 2-horn, 3-upper positioning plate, 4-internal hexagonal screw, 5-spring washer, 6-sleeve, 7-complementary core, 8-medium, 9-lower positioning plate, 10-internal hexagonal screw, 11-spring washer, 12-threaded hole, 14-medium inlet hole, 15-medium inlet hole, 16-threaded hole, 17-mounting counter bore, 18-horn small end positioning hole, 19-mounting counter bore, 20-horn large end concave positioning step, 21-abrasive material channel, 22-mounting counter bore, 23-upper positioning plate positioning circular truncated cone, 24-sleeve inner hole, 25-lower positioning plate positioning circular truncated cone, 26-horn small end to be processed, and 27-horn large end to be processed.
Detailed Description
The present invention will be further described with reference to the following drawings and examples, which include, but are not limited to, the following examples.
The invention provides a thin-wall special-shaped horn antenna inner surface polishing tool for 3D printing, which comprises an upper positioning plate, a lower positioning plate, a sleeve and a complementary core, wherein the upper positioning plate and the lower positioning plate are connected through the sleeve, the upper positioning plate is connected with the upper part of the sleeve in a positioning mode through a circular table, the lower positioning plate is connected with the lower part of the sleeve in a positioning mode through a circular table, the complementary core is arranged on the lower positioning plate and connected through a fastening piece, a horn is arranged between the upper positioning plate and the lower positioning plate, and the large end and the small end of the horn are respectively arranged in a concave table and a hole of the lower positioning plate and. The sleeve wraps the exterior of the horn to be processed, the inner size of the sleeve is matched with the size of the horn, and the upper positioning plate and the lower positioning plate are connected together in parallel through the fastening piece. Two holes are reserved in the radial direction of the sleeve and used for filling media into the sleeve, and the periphery of the horn to be processed is tightly wrapped after the media are cooled and solidified. The shape of the supplement core is completely similar to the shape of the inner surface of the horn to be processed, the sizes of the supplement core in all directions are smaller than the inner surface of the horn to be processed, and the gap can be between 0.8 and 2 millimeters. The lower positioning plate is provided with a concave positioning step at the joint with the large port of the horn to be processed, and the concave step is provided with a circle of discontinuous gap as a channel along the inner periphery of the horn and used for allowing abrasive particle flow to enter the inner surface of the horn and be extruded from the other end of the horn.
The positioning hole of the upper positioning plate is matched with the small end of the horn in shape and size.
The shape and size of the concave positioning step of the lower positioning plate are matched with those of the large end of the horn.
The bushing is arranged on the lower positioning plate and connected by a fastener.
A circle of intermittent gap is reserved on the concave step of the lower positioning plate along the inner periphery of the step.
The sleeve leaves two holes in the radial direction.
The medium is solid at normal temperature and liquid after being heated.
The inner surface abrasive particle flow polishing tool for the 3D printed thin-wall special-shaped horn antenna is combined and then filled with media through two holes reserved in the sleeve, and the media are encapsulated in the sleeve to wrap the periphery of the horn and fill the inner cavity of the sleeve.
The media filled in the 3D printing thin-wall special-shaped horn antenna inner surface abrasive particle flow polishing tool combination comprises a metal medium and a nonmetal medium. The medium selected in this embodiment is a low melting point alloy, and its composition: 50% of bismuth, 25% of lead, 12.5% of tin and 12.5% of cadmium. The alloy has a melting point of 72 ℃, can be remelted in hot water, and has good fluidity and bright appearance.
As shown in fig. 1 to 7, an embodiment of the invention discloses an inner surface abrasive flow polishing tool for a 3D printed thin-wall special-shaped horn antenna, which comprises an upper positioning plate 3, a sleeve 6, a lower positioning plate 9 and a complementary core 7. Wherein the bushing 7 is arranged on a lower positioning plate 9 and is fastened and connected by a screw 10 and a spring washer 11. The horn 2 to be processed is arranged in the horn big end concave positioning step 20 of the lower positioning plate 9. The sleeve 6 is arranged on the lower positioning plate 9, positioned by the round platform 25 on the lower positioning plate 9 and fastened and connected by the screw 4 and the spring washer 5. The horn small end positioning hole 18 on the upper positioning plate 3 is positioned through the round platform of the upper positioning plate 3 after the horn small end 26 to be processed is arranged in the horn small end positioning hole, and is arranged on the sleeve 6 and is fastened and connected through the screw 4 and the spring washer 5. The length of the sleeve 6 is matched with the length of the positioning size of the loudspeaker to be processed, so that the precision of the tool after assembly is guaranteed.
As shown in fig. 3, the center of the upper positioning plate 3 in this embodiment is provided with a horn small end positioning hole 18 matching with the shape and size of the horn small end 25 to be processed, and a circular truncated cone 23 and a mounting counter bore 17 for positioning with the sleeve 6.
As shown in fig. 4, in the present embodiment, the circular hole 24 at the center of the sleeve 6 is matched with the large end of the horn to be processed, the upper and lower surfaces have four threaded holes 12 respectively for connecting the upper positioning plate 3 and the lower positioning plate 9, and two holes 14, 15 are left in the radial direction of the sleeve 6 for filling the medium.
As shown in fig. 5, the shape of the patch core 7 in this embodiment is completely similar to the shape of the inner surface of the horn to be processed, and all dimensions thereof are smaller than the inner surface of the horn to be processed. The screw hole 16 on the bushing 7 is used for connecting with the lower positioning plate 9.
As shown in fig. 6, in the present embodiment, the lower positioning plate 9 is provided with a concave positioning step 20 at the central portion thereof, which matches with the outer surface of the large end of the horn, and a flow channel 21 for the abrasive to enter the inner surface of the horn to be processed, and two mounting counterbores 22 for mounting the complementary cores 7 are provided on the lower positioning plate 9. The lower positioning plate 9 is provided with a round table 25 and a mounting counter bore 19 which are used for positioning the sleeve 6.
The frock of this embodiment design can be designed according to the structure of treating processing loudspeaker, and its design principle is unchangeable.
According to the structural description, the components are assembled in a butt joint mode according to the functions as shown in fig. 1, the upper positioning plate 3 and the lower positioning plate 9 are connected with the sleeve 6 through the fasteners 4 and 5, and the lower end face of the large end 27 of the horn 2 to be machined is matched with the lower concave positioning step 20 of the lower positioning plate 9 to tightly prevent abrasive from entering the inner hole 24 of the sleeve 6 from the abrasive passage 12. After the assembly is finished, the potting medium is heated and then enters the inner hole 24 of the sleeve 6 from any one of the medium inlet holes 14 and 15 in the sleeve 6, and the filling is finished when the medium flows out from the other one of the medium inlet holes 14 and 15. And after cooling, the tool is assembled.
The inner surface abrasive particle flow polishing tool for 3D printing of the thin-wall special-shaped horn antenna introduces the purposes of arranging the complementary core inside the horn to be processed and wrapping the outer surface of the horn to be processed with a medium outside so as to control the grinding consistency of the grinding materials and prevent the horn from deforming and damaging the horn structure.
Claims (3)
1. The utility model provides a horn antenna's internal surface polishing frock, includes locating plate, lower locating plate, sleeve and mends the core, its characterized in that: the sleeve is a hollow cylinder, the upper positioning plate and the lower positioning plate are connected through the sleeve, the upper positioning plate and the lower positioning plate are respectively sunken on the end surfaces of the opposite ends, and through holes penetrating through the upper positioning plate and the lower positioning plate are formed in the sunken positions; the horn antenna is arranged in the sleeve, and two ends of the horn antenna are respectively positioned at the concave parts of the upper positioning plate and the lower positioning plate; the patch core is arranged in the large end of the horn antenna; the shape of the inner wall of the sleeve is the same as the shape of the horn antenna, and a gap is reserved between the inner wall of the sleeve and the outer wall of the horn antenna; the side wall of the sleeve is provided with at least two through holes for filling a medium into the sleeve, and the medium is cooled and solidified to tightly wrap the periphery of the horn antenna; the outer wall of the supplement core is the same as the inner wall of the big end of the horn antenna in shape, and a gap is reserved between the outer wall of the supplement core and the inner wall of the big end of the horn antenna; a circle of discontinuous gaps are reserved at the connecting position of the lower positioning plate and the large port part of the horn antenna and are used as channels, and abrasive particle flow flowing in from the through hole of the lower positioning plate enters the inner surface of the horn antenna and is extruded from the other end of the horn antenna to the through hole of the upper positioning plate.
2. The internal surface polishing tool of the horn antenna of claim 1, characterized in that: a gap is reserved between the outer wall of the supplement core and the inner wall of the large end of the horn antenna, and the gap distance is 0.8-2 mm.
3. The internal surface polishing tool of the horn antenna of claim 1, characterized in that: the end face of one end, opposite to the upper positioning plate and the lower positioning plate, is provided with a bulge at the outer edge of the concave part, and the diameter of the bulge part is the same as the inner diameter of the sleeve and is used for positioning the connecting sleeve at the same time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920500695.8U CN209793490U (en) | 2019-04-15 | 2019-04-15 | Internal surface polishing tool for horn antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920500695.8U CN209793490U (en) | 2019-04-15 | 2019-04-15 | Internal surface polishing tool for horn antenna |
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| CN209793490U true CN209793490U (en) | 2019-12-17 |
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| CN201920500695.8U Active CN209793490U (en) | 2019-04-15 | 2019-04-15 | Internal surface polishing tool for horn antenna |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110026880A (en) * | 2019-04-15 | 2019-07-19 | 中国电子科技集团公司第二十研究所 | The inner surface abrasive Flow of 3D printing thin wall special-shaped electromagnetic horn polishes tooling |
| CN114441278A (en) * | 2021-12-20 | 2022-05-06 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Encapsulating method and device for composite material reinforced wall plate test piece for airplane |
-
2019
- 2019-04-15 CN CN201920500695.8U patent/CN209793490U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110026880A (en) * | 2019-04-15 | 2019-07-19 | 中国电子科技集团公司第二十研究所 | The inner surface abrasive Flow of 3D printing thin wall special-shaped electromagnetic horn polishes tooling |
| CN110026880B (en) * | 2019-04-15 | 2024-07-05 | 中国电子科技集团公司第二十研究所 | 3D prints interior surface abrasive flow polishing frock of thin wall dysmorphism horn antenna |
| CN114441278A (en) * | 2021-12-20 | 2022-05-06 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Encapsulating method and device for composite material reinforced wall plate test piece for airplane |
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