CN111864332B - Method for quickly curing silicon rubber filled in high-power circulator/isolator - Google Patents
Method for quickly curing silicon rubber filled in high-power circulator/isolator Download PDFInfo
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- CN111864332B CN111864332B CN202010766164.0A CN202010766164A CN111864332B CN 111864332 B CN111864332 B CN 111864332B CN 202010766164 A CN202010766164 A CN 202010766164A CN 111864332 B CN111864332 B CN 111864332B
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- silicon rubber
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- upper substrate
- isolator
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/32—Non-reciprocal transmission devices
- H01P1/36—Isolators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/32—Non-reciprocal transmission devices
- H01P1/38—Circulators
Abstract
The invention discloses a method for quickly curing silicone rubber filled in a high-power circulator/isolator, which comprises the steps of preparing materials and cleaning; assembling the lower half cavity; pre-filling silicon rubber; assembling a circuit; assembling an upper substrate; pressing the upper substrate downwards through a pressing tool; filling silicon rubber at the joint of the central conductor and the connector; and opening and curing. The invention provides an open silicone rubber curing method, and the packaging quality and the packaging efficiency of the product are improved by combining a tool. The silicon rubber curing can be accelerated, the curing period is shortened, the curing period of the silicon rubber can be shortened from the original 30 days to 5 days under the same condition, the silicon rubber curing quality is high, the consistency is good, and the problem of curing the silicon rubber of the satellite-borne coaxial high-power microwave ferrite circulator/isolator filled with the large-scale silicon rubber can be effectively solved.
Description
Technical Field
The invention relates to an assembly method of a circulator/isolator, in particular to a method for quickly curing silicone rubber filled in a high-power circulator/isolator.
Background
With the rapid development of satellite navigation technology, high orbit satellites are widely applied to various subject fields such as communication, resource survey, weather, astronomy, biology and the like by virtue of the unique characteristics of high orbit and static earth, and become important orbit resources. The high-power microwave ferrite circulator/isolator is a core component of a high-orbit satellite payload, the working power of the high-power microwave ferrite circulator/isolator is usually in the order of thousands of watts, and the micro-discharge suppression power of the high-power microwave ferrite circulator/isolator is in the order of ten thousand watts, which puts new requirements on high-power design and high-micro-discharge suppression design of the high-orbit satellite-borne microwave ferrite circulator/isolator.
Generally, a method for improving the power capacity and the micro-discharge inhibition capability of a satellite-borne microwave ferrite circulator/isolator is to fill silicon rubber in a product, prevent air breakdown, cut off a micro-discharge path to obtain high working power and high micro-discharge inhibition capability of the circulator/isolator, improve the reliability and the service life of the circulator/isolator, and effectively guarantee the long-term stable and reliable work of the effective load of a high-orbit satellite.
The traditional satellite-borne high-power microwave ferrite circulator/isolator usually adopts a closed-cavity natural shade drying method to solidify filled silicon rubber, which is practical and effective for a conventional satellite-borne product filled with small-scale silicon rubber. However, the microwave ferrite circulator/isolator with ultra-high power and ultra-high micro-discharge inhibition capability applied to the high orbit satellite needs to be filled with large-scale silicon rubber, the curing period is at least over 30 days by utilizing the traditional silicone rubber curing method of closed-cavity natural shade drying, meanwhile, the internal air is difficult to be completely removed due to the large filling amount and local thicker silicone rubber, and the internal air is difficult to be completely removed due to the uneven curing speed of the silicone rubber, the filling quality of the silicone rubber is poor after the closed-cavity natural shade drying curing, and cavities or bubbles exist in the internal part, so that the power capacity and the micro-discharge inhibition capability of the microwave ferrite circulator/isolator are difficult to meet the use requirements.
Disclosure of Invention
The invention aims to provide a method for quickly curing silicone rubber filled in a high-power circulator/isolator, which solves the problems and can quickly cure silicone rubber, shorten the curing period and improve the curing quality.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a method for quickly curing silicone rubber filled in a high-power circulator/isolator comprises the following steps:
(1) preparing and cleaning materials, wherein the materials comprise a lower cavity, a lower medium, a lower substrate, a central conductor, an upper substrate, an upper cavity and a connector;
(2) assembling the lower half cavity: sequentially assembling a lower cavity, a lower medium and a lower substrate;
(3) pre-filling silicon rubber: pre-filling silicon rubber on the assembled lower half cavity, filling a gap between the lower substrate and the lower medium, and then uniformly filling a layer of silicon rubber;
(4) assembling a circuit: sinking the central conductor into the pre-filled silicon rubber, installing and fastening a connector, and filling the silicon rubber on the surface of the central conductor to enable the silicon rubber to completely cover the circuit area of the central conductor;
(5) assembling an upper substrate;
(6) pressing the upper substrate downwards through a pressing tool;
(7) filling silicon rubber at the joint of the central conductor and the connector;
(8) and (4) opening and curing.
Preferably, the method comprises the following steps: and (5) assembling the upper substrate through a substrate positioning fixture, wherein the upper surface of the lower cavity is also provided with a counter bore, the substrate positioning fixture comprises a bottom and a through hole capable of placing the upper substrate, and when the bottom is positioned in the counter bore, the through hole is just coaxial with the lower medium.
Preferably, the method comprises the following steps: in the step (6), the upper substrate is pressed through a pressing tool, the pressing tool comprises a base, a support frame is arranged above the base, a threaded hole is vertically formed in the support frame, a bolt penetrates through the threaded hole, a hexagonal prism-shaped tightening head is arranged at the top of the bolt, a cylindrical pressure head is arranged at the bottom of the bolt, the tightening head, the bolt and the pressure head are coaxially arranged, the tightening head is used for being matched with a torque wrench, and the diameter of the pressure head is not larger than that of a through hole of the substrate positioning clamp;
and (3) during pressing, putting the whole obtained in the step (5) on the upper surface of the base, wherein the through hole of the substrate positioning clamp is opposite to the pressure head, and rotating the tightening head through the torque wrench so as to rotate the bolt to drive the pressure head to move downwards.
Preferably, the method comprises the following steps: the step (6) is specifically as follows:
(61) putting the whole obtained in the step (5) on the upper surface of a base, wherein the through hole of the substrate positioning clamp is opposite to the pressure head;
(62) and setting a torque value, and rotating the tightening head through a torque wrench to drive the pressure head to move downwards to press the upper substrate.
Preferably, the method comprises the following steps: the contact area of the pressure head and the upper substrate is made of a plastic sleeve.
Preferably, the method comprises the following steps: and (8) putting the whole obtained in the step (7) into a clean space until the silicon rubber is completely cured, wherein the invention provides a non-closed-cavity open-type silicon rubber curing method, and a silicon rubber curing tool is cooperatively used in the method.
The silicon rubber curing tools mainly comprise two tools, a substrate positioning clamp and a pressing tool.
When the upper substrate is installed, a substrate positioning clamp is adopted, so that the upper substrate is coaxial with a lower substrate which cannot be seen from the lower surface when the upper substrate is installed. The invention provides a specific structure of a substrate positioning clamp, which needs the matching of a lower cavity, a counter bore is arranged on the lower cavity, the bottom of the substrate positioning clamp is positioned when being placed into the counter bore, a through hole in the middle part can be just placed into an upper substrate, and the upper substrate and the lower substrate are completely coaxial, so that the installation of the upper substrate is simple, whether the upper substrate and the lower substrate are aligned is detected without adopting other measuring tools, and the assembly efficiency is improved.
In the prior art, when the cavity-closing curing is carried out, the upper substrate, the lower substrate and the central conductor are pressed and positioned by the upper cavity and the lower cavity, but the invention changes the curing mode and adopts an open curing mode, so that the upper cavity is not arranged during the curing, and the upper substrate, the lower substrate and the central conductor cannot be pressed and positioned. Therefore, the invention adopts the substrate positioning fixture to position and the pressing tool to press.
The pressing tool can replace an upper cavity, the upper substrate and the lower substrate are guaranteed to be tightly attached to the central conductor, other unreliable factors are guaranteed to be effectively prevented from being introduced, the silicon rubber smeared before is enabled to be even, air can be exhausted, the curing speed is accelerated, cavities and bubbles are effectively prevented from being generated, and the product quality is improved. The head of the pressing tool is a hexagonal nut, so that torque is controlled when the pressing tool is rotated and pressed conveniently, the torque is determined, and pressure borne by the substrate when the upper cavity and the lower cavity are combined can be simulated and replaced, so that each solidified product has consistency.
Compared with the prior art, the invention has the advantages that:
(1) a novel method for quickly curing silicone rubber filled in a high-power circulator/isolator is provided, and a substrate positioning clamp and a pressing tool are combined in the method, so that the method has the advantages of high curing speed, high curing quality and strong micro-discharge inhibition capability after open curing of silicone rubber. And the sealed cavity-closing curing easily seals air in the silicon rubber and introduces air bubbles to cause the product to generate discharge under high power.
(2) The substrate positioning fixture is simple in structure, and can be positioned only by matching the lower cavity, so that the upper substrate and the lower substrate are coaxial, the upper substrate is simply and quickly positioned, the whole coaxiality of a product is guaranteed, and manual operation is facilitated.
(3) The substrate positioning clamp is adopted to compress the upper substrate, so that the silicon rubber is more uniform, air bubbles can be discharged, and the product quality is improved. The tightening head is of a hexagonal prism structure, so that the tightening head can be conveniently matched with a torque wrench, the torque is quantized, and the force for closing the cavity to compress the substrate is simulated, so that the open type cured microwave ferrite circulator/isolator has better consistency. The pressing head is generally made of rubber materials or other low-hardness materials, and can also be a plastic sleeve, and the size of the pressing head is equivalent to that of the upper substrate, so that the upper substrate is protected from being damaged, and the surface of the upper substrate is controlled to be uniformly stressed and the position of the upper substrate is stable.
(4) The silicon rubber is cured in a non-cavity-closing state, so that the silicon rubber curing is accelerated, the curing period is shortened, the curing period of the silicon rubber can be shortened to 5 days from the original 30 days under the same condition, the silicon rubber curing quality is high, the consistency is good, and the problem of curing the silicon rubber of the satellite-borne coaxial high-power microwave ferrite circulator/isolator filled with large-scale silicon rubber can be effectively solved.
Drawings
FIG. 1 is an exploded view of an circulator;
FIG. 2 is a schematic view of the lower chamber of FIG. 1;
FIG. 3 is a top view of a substrate positioning fixture;
FIG. 4 is a bottom view of the substrate positioning fixture;
FIG. 5 is a cross-sectional view A-A of FIG. 3;
fig. 6 is a schematic structural view of the pressing tool.
In the figure: 1. a lower cavity; 2. a lower medium; 3. a lower substrate; 4. a center conductor; 5. an upper substrate; 6. an upper cavity; 7. a gasket; 8. a counter bore; 9. a substrate positioning jig; 10. a through hole; 11. a pressure head; 12. a base; 13. a support frame; 14. a bolt; 15. tightening a head; 16. and (5) positioning the boss.
Detailed Description
The invention will be further explained with reference to the drawings.
Example 1: referring to fig. 1 to 6, a method for quickly curing silicone rubber filled in a high-power circulator/isolator includes the following steps:
(1) preparing and cleaning materials, wherein the materials comprise a lower cavity 1, a lower medium 2, a lower substrate 3, a central conductor 4, an upper substrate 5, an upper cavity 6 and a connector.
(2) Assembling the lower half cavity: the lower cavity 1, the lower medium 2 and the lower substrate 3 are assembled in sequence.
(3) Pre-filling silicon rubber: and pre-filling silicon rubber on the assembled lower half cavity, filling a gap between the lower substrate 3 and the lower medium 2, and then uniformly filling a layer of silicon rubber.
(4) Assembling a circuit: the central conductor 4 is sunk into the pre-filled silicon rubber, the connector is installed and fastened, and the silicon rubber is filled on the surface of the central conductor 4, so that the silicon rubber completely covers the circuit area of the central conductor 4.
(5) Assembling the upper substrate 5; specifically, the assembly is carried out through a substrate positioning clamp 9, a counter bore 8 is further arranged on the upper surface of the lower cavity 1, the substrate positioning clamp 9 comprises a bottom and a through hole 10 capable of placing the upper substrate 5, and when the bottom is located in the counter bore 8, the through hole 10 is just coaxial with the lower medium 2.
(6) The upper substrate 5 is pressed downwards through a pressing tool; the pressing tool comprises a base 12, a support frame 13 is arranged above the base 12, a threaded hole is vertically formed in the support frame 13, a bolt 14 penetrates through the threaded hole, a hexagonal prism-shaped tightening head 15 is arranged at the top of the bolt 14, a cylindrical pressure head 11 is arranged at the bottom of the bolt, the tightening head 15, the bolt 14 and the pressure head 11 are coaxially arranged, the tightening head 15 is used for being matched with a torque wrench, and the diameter of the pressure head 11 is not larger than that of a through hole 10 of a substrate positioning clamp 9; the method specifically comprises the following steps:
(61) putting the whole obtained in the step (5) on the upper surface of a base 12, wherein the through hole 10 of the substrate positioning clamp 9 is opposite to a pressure head 11;
(62) and setting a torque value, and rotating the tightening head 15 through a torque wrench to drive the pressure head 11 to move downwards to press the upper substrate 5.
(7) And (4) filling silicon rubber at the joint of the central conductor 4 and the connector.
(8) Opening and curing; and (4) putting the whole obtained in the step (7) into a clean space until the silicon rubber is completely cured.
In this embodiment, the contact area between the pressure head 11 and the upper substrate 5 is made of a plastic sleeve.
Example 2: referring to fig. 1 to fig. 6, a specific method for rapidly curing silicone rubber filled in a circulator is provided on the basis of example 1. The circulator structure is shown in fig. 1, and comprises a lower cavity 1, a lower medium 2, a lower substrate 3, a central conductor 4, an upper substrate 5, an upper cavity 6 and a gasket 7. We have a counterbore 8 in the lower chamber 1 for mounting a substrate positioning fixture 9.
In addition, in this embodiment, a positioning boss 16 is arranged on the base 12 of the pressing tool, the positioning boss 16 is used for placing the lower cavity 1, and after the lower cavity 1 is placed, it can be ensured that the upper substrate 5 and the pressing head 11 have high concentricity, so that non-uniform stress of the upper substrate 5 can be avoided.
The method can accelerate the curing of the silicon rubber and shorten the curing period, the curing period of the silicon rubber can be shortened from the original 30 days to 5 days under the same condition, simultaneously, the curing quality of the silicon rubber is high, the consistency is good, and the problem of curing the silicon rubber of the satellite-borne coaxial high-power microwave ferrite circulator/isolator filled with large-scale silicon rubber can be effectively solved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. A method for quickly curing silicone rubber filled in a high-power circulator/isolator is characterized by comprising the following steps: the method comprises the following steps:
(1) preparing and cleaning materials, wherein the materials comprise a lower cavity, a lower medium, a lower substrate, a central conductor, an upper substrate, an upper cavity and a connector;
(2) assembling the lower half cavity: the lower cavity, the lower medium and the lower substrate are assembled from bottom to top in sequence;
(3) pre-filling silicon rubber: pre-filling silicon rubber on the assembled lower half cavity, filling a gap between the lower substrate and the lower medium, and then uniformly filling a layer of silicon rubber;
(4) assembling a circuit: sinking the central conductor into the pre-filled silicon rubber, installing and fastening a connector, and filling the silicon rubber on the surface of the central conductor to enable the silicon rubber to completely cover the circuit area of the central conductor;
(5) mounting an upper substrate on the center conductor;
(6) pressing the upper substrate downwards through a pressing tool;
(7) filling silicon rubber at the joint of the central conductor and the connector;
(8) opening and curing;
(9) assembling the upper cavity and the lower cavity together;
when the upper substrate is assembled, assembling through a substrate positioning fixture, wherein the upper surface of the lower cavity is also provided with a counter bore, the substrate positioning fixture comprises a bottom and a through hole capable of placing the upper substrate, when the bottom is positioned in the counter bore, the through hole is just coaxial with the lower medium, and the upper substrate is placed in the through hole;
in the step (6), the upper substrate is pressed through a pressing tool, the pressing tool comprises a base, a support frame is arranged above the base, a threaded hole is vertically formed in the support frame, a bolt penetrates through the threaded hole, a hexagonal prism-shaped tightening head is arranged at the top of the bolt, a cylindrical pressure head is arranged at the bottom of the bolt, the tightening head, the bolt and the pressure head are coaxially arranged, the tightening head is used for being matched with a torque wrench, and the diameter of the pressure head is not larger than that of a through hole of the substrate positioning clamp;
and (3) during pressing, putting the whole obtained in the step (5) on the upper surface of the base, wherein the through hole of the substrate positioning clamp is opposite to the pressure head, and rotating the tightening head through the torque wrench so as to rotate the bolt to drive the pressure head to move downwards.
2. The method for rapidly curing the silicone rubber filled in the high-power circulator/isolator as claimed in claim 1, wherein: the step (6) is specifically as follows:
(61) putting the whole obtained in the step (5) on the upper surface of a base, wherein the through hole of the substrate positioning clamp is opposite to the pressure head;
(62) and setting a torque value, and rotating the tightening head through a torque wrench to drive the pressure head to move downwards to press the upper substrate.
3. The method for rapidly curing the silicone rubber filled in the high-power circulator/isolator as claimed in claim 1, wherein: the contact area of the pressure head and the upper substrate is made of a plastic sleeve.
4. The method for rapidly curing the silicone rubber filled in the high-power circulator/isolator as claimed in claim 1, wherein: and (8) putting the whole obtained in the step (7) into a clean space until the silicon rubber is completely cured.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0807511A1 (en) * | 1995-12-05 | 1997-11-19 | Namba Press Works Co., Ltd. | Method of manufacturing integral molded products out of silicone rubber |
| CN101975593A (en) * | 2010-09-28 | 2011-02-16 | 四川光恒通信技术有限公司 | Adhesive structured pigtail type detector |
| CN102158795A (en) * | 2011-04-02 | 2011-08-17 | 无锡杰夫电声有限公司 | Method for accelerating agglutination and curing of loudspeaker cone corrugated rim and loudspeaker bracket by hot-pressing forming machine |
| CN102629705A (en) * | 2012-04-28 | 2012-08-08 | 成都泰格微波技术股份有限公司 | C-band high-power circulator and production process thereof |
| CN110294934A (en) * | 2018-03-23 | 2019-10-01 | 英济股份有限公司 | Liquid-state silastic compositions and its manufacturing method and oral cavity isolator |
| CN211137966U (en) * | 2019-11-18 | 2020-07-31 | 高密市神马鞋业有限公司 | Customized mould |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4684835B2 (en) * | 2005-09-30 | 2011-05-18 | 信越化学工業株式会社 | Method for reducing surface tackiness of cured silicone rubber, liquid silicone rubber composition for semiconductor encapsulation, silicone rubber encapsulated semiconductor device, and method for producing the semiconductor device |
| JP2006186401A (en) * | 2006-03-30 | 2006-07-13 | Denso Corp | Semiconductor device and method of manufacturing semiconductor device |
| CN111129676B (en) * | 2020-01-14 | 2022-01-21 | 中国电子科技集团公司第九研究所 | Method for improving harmonic suppression performance of circulator and circulator |
-
2020
- 2020-08-03 CN CN202010766164.0A patent/CN111864332B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0807511A1 (en) * | 1995-12-05 | 1997-11-19 | Namba Press Works Co., Ltd. | Method of manufacturing integral molded products out of silicone rubber |
| CN101975593A (en) * | 2010-09-28 | 2011-02-16 | 四川光恒通信技术有限公司 | Adhesive structured pigtail type detector |
| CN102158795A (en) * | 2011-04-02 | 2011-08-17 | 无锡杰夫电声有限公司 | Method for accelerating agglutination and curing of loudspeaker cone corrugated rim and loudspeaker bracket by hot-pressing forming machine |
| CN102629705A (en) * | 2012-04-28 | 2012-08-08 | 成都泰格微波技术股份有限公司 | C-band high-power circulator and production process thereof |
| CN110294934A (en) * | 2018-03-23 | 2019-10-01 | 英济股份有限公司 | Liquid-state silastic compositions and its manufacturing method and oral cavity isolator |
| CN211137966U (en) * | 2019-11-18 | 2020-07-31 | 高密市神马鞋业有限公司 | Customized mould |
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