CN111370836A - Cavity filter assembling method for welding cover plate - Google Patents
Cavity filter assembling method for welding cover plate Download PDFInfo
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- CN111370836A CN111370836A CN201811596060.9A CN201811596060A CN111370836A CN 111370836 A CN111370836 A CN 111370836A CN 201811596060 A CN201811596060 A CN 201811596060A CN 111370836 A CN111370836 A CN 111370836A
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- cover plate
- welding
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- solder paste
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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
- H01P11/007—Manufacturing frequency-selective devices
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- General Induction Heating (AREA)
Abstract
The invention discloses a method for assembling a cavity filter of a welded cover plate, which comprises the following steps: (1) positioning the cover plate through a positioning pin or a plurality of screws; (2) the cover plate and the cavity ribs are separated by a tin paste layer; (3) the cover plate and the cavity are assembled and then preheated; prevent deformation and stress generation due to local high temperature. The invention provides a novel assembly method for welding a cavity on a cover plate of a cavity filter, and the high-frequency induction heating welding technology is superior, has high heating speed and high production efficiency, greatly shortens the welding time, improves the production efficiency and reduces the production cost; the heat influence is reduced, the damage to a substrate is small, the heating depth is shallow due to the skin effect of high-frequency induction heating, the solder paste absorbs heat quickly and melts quickly, and the influence on a coating of the cavity is small; for the purpose of welding, the thickness of a steel mesh or the like used for printing is 0.1 to 0.15mm, and the thickness of solder paste is less than 0.25 mm; in order to realize rapid welding, the temperature of the preheating furnace is controlled at a conventional aging temperature of 80 +/-10 ℃.
Description
Technical Field
The invention relates to the technical field of cavity filter assembly, in particular to a cavity filter assembly method for welding a cover plate.
Background
In the field of radio frequency communication, a filter is used as an important device in a base station system, and in the development trend of the filter, high performance, miniaturization and light weight are targets which are continuously sought by people.
Because the cover plate and the cavity of the cavity filter are usually connected by screws at the present stage, the screws need to be distributed according to the frequency of the product, and a large number of screws are needed to ensure that the signal cannot be leaked. The cavity position regulation degree of the product is influenced, the product performance is reduced, and the processing working hour and the assembly working hour are increased.
Due to market demands, all large device suppliers develop new technologies, a reflow soldering device is used for a cover plate soldering cavity, the occupied area of the device is large, the cost is high, the application is limited by the service life of a tool clamp, and the development of the new soldering technology is imperative.
The high-frequency induction heating welding technology has the following characteristics that ⑴ heating speed is high, production efficiency is high, high-frequency induction heating unit power is as high as 500-1000 KW/m2, the time required by large-area welding is only a few seconds, the welding time is greatly shortened, the production efficiency is improved, and the production cost is reduced.
⑵ heat influence is reduced, damage to the substrate is small, the skin effect of high-frequency induction heating makes the heating depth very shallow, and the solder paste absorbs heat quickly and melts quickly, and has little influence on the coating of the cavity.
Therefore, a new method for assembling the welded cavity of the cover plate of the cavity filter is urgently needed to be researched.
Disclosure of Invention
The present invention is directed to a method for assembling a cavity filter with a welded cover plate, so as to solve the problems mentioned in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a method for assembling a cavity filter of a welding cover plate comprises the following steps: (1) positioning the cover plate through a positioning pin or a plurality of screws; (2) the cover plate and the cavity ribs are separated by a tin paste layer; (3) the cover plate and the cavity are assembled and then preheated; the integral temperature of the product can be improved, and the deformation and stress caused by high local temperature can be prevented; (4) carrying out high-frequency induction welding on the preheated product; installing a positioning cover plate, loading a certain pressure on the cover plate, welding, melting the solder paste into a liquid state at a certain temperature, expanding the volume, and reducing the volume in the curing process; (5) cooling to obtain a welding qualified product; the cooling process applies pressure, and the welding layer is better solidified.
Preferably, the cover plate is positioned by 3 positioning pins in the step (1), the cavity and the cover plate are pre-tightened by using a clamp, and the deformation of the cover plate can be reduced by positioning by using pins, so that the purpose of good contact is realized.
Preferably, in the step (1), the cover plate is positioned at two sides and the middle part of the cover plate through a few screws, and the screws are provided with spring washers for pre-installing the cover plate to replace a positioning scheme of positioning pins; the four corners and the middle of the screw with the spring gasket can be properly positioned, so that the manufacturing difficulty of the clamp is reduced.
Preferably, in the step (2), solder paste is printed on the contact surface of the cover plate and the cavity rib, and the width of the solder paste is smaller than that of the cavity rib at the contact position of the cover plate.
Preferably, for the purpose of welding and ensuring the welding quality, the thickness of the steel mesh used in the process of printing the solder paste is 0.1-0.15 mm, and the thickness of the solder paste is less than 0.25 mm.
Preferably, the tin-bismuth-silver low-temperature solder paste is selected in the solder paste printing process and is different from the melting point temperature of a tin-silver-copper welding wire welded at an input/output port.
Preferably, in order to achieve rapid welding, the pre-packaged product in step (3) is preheated in a preheating furnace at a temperature in the range of 80 ℃. + -. 10 ℃ in a conventional ageing temperature.
Preferably, in the step (4), high-frequency induction welding is utilized, the heating speed is high, the production efficiency is high, the welding time is greatly shortened, the production rate is improved, and the production cost is reduced.
Preferably, in the high-frequency induction welding process, the time of the high-frequency induction welding is controlled by controlling the distance between the current and the induction coil and the product; the high-frequency induction welding heat has small influence and small damage to a base body, the heating depth is very shallow due to the skin effect of high-frequency induction heating, the solder paste absorbs heat quickly and melts quickly, the coating of the cavity has small influence, and the intermodulation performance of the product can be greatly improved.
Preferably, in the process of cooling to obtain a welding qualified product, a metal pressing block is applied along a solder paste welding line for cooling.
Compared with the prior art, the invention has the following beneficial effects: 1. the high-frequency induction heating welding technology has the advantages of high heating speed and high production efficiency, greatly shortens the welding time, improves the production efficiency and reduces the production cost; the heat influence is small, the damage to a substrate is small, the heating depth is shallow due to the skin effect of high-frequency induction heating, the solder paste absorbs heat quickly and is melted quickly, and the influence on a coating of the cavity is small.
2. For the purpose of welding, the thickness of a steel mesh or the like used for printing is 0.1 to 0.15mm, and the thickness of solder paste is less than 0.25 mm; in order to realize rapid welding, the temperature of the preheating furnace is controlled at a conventional aging temperature of 80 +/-10 ℃.
3. The invention adopts the pin positioning to reduce the deformation of the cover plate and realize the purpose of good contact; the invention can properly adopt the four corners and the middle of the screw with the spring gasket for positioning, thereby reducing the manufacturing difficulty of the clamp; the invention avoids using ferromagnetic material to make press-mounting positioning fixture and uses non-ferromagnetic material to make tool for pressing positioning cover plate.
4. Debugging the high-frequency induction welding time and the welding distance in advance, and setting parameters; and (3) positioning the cover plate by using a tool, and loading a certain pressure on the cover plate to perform welding.
5. And (5) after welding, applying a metal pressing block along a solder paste welding line, and cooling.
6. Compared with the existing screw fixing mode, the screw fixing device has the advantages that the screw and assembly cost is reduced, the processing time of the cover plate and the cavity is shortened, the processing cost of the product is reduced, the weight of the product is reduced, the utilization rate of the cavity in the cavity is improved, the product performance is improved and the product competitiveness is improved under the condition that the same volume is required by customers.
Drawings
Fig. 1 is a flow chart of an assembly process in a method for assembling a cavity filter by welding a cover plate.
Fig. 2 is a printed solder paste diagram in a cavity filter assembly method of welding a cover plate.
Fig. 3 is a view illustrating an assembly of the interior of a cavity in a method of assembling a cavity filter by welding a cover plate.
Fig. 4 is a schematic diagram of a welding principle in a method for assembling a cavity filter by welding a cover plate.
Fig. 5 is a comparative invention diagram of a screw fastening diagram of a design prototype in a cavity filter assembly method of a welded cover plate.
Fig. 6 is a diagram of a welded product in a method for assembling a cavity filter by welding a cover plate.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Referring to fig. 1-6, a method for assembling a cavity filter with a welded cover plate; the process flow diagram of the assembly process of the cavity filter of the welded cover plate is carried out according to the figure 1; along the cover plate surface in contact with the cavity ribs, in the manner shown, up to the steel mesh, the thickness of the steel mesh is 0.1 to 0.15 mm.
Printing a tin paste layer with the thickness of 0.15-0.20 mm on the surface of the cover plate contacted with the cavity ribs as shown in figure 2; the specific solder paste layer is low-temperature tin-bismuth-silver solder paste, and the melting point of the solder paste layer is lower than the temperature of the solder wires at the input and output ports.
Assembling a cover plate after the assembly of the inner part of the cavity is finished according to the mode of figure 3, wherein the moment of the positioning screw is 0.8 N.m; preheating in a preheating furnace at 80 +/-10 deg.c; the cavity is taken out and fixed on the welding table by the cooperation of heat insulation materials, and the cover plate and the cavity are positioned by a fastening clamp.
Adjusting the welding table under the induction coil according to the schematic diagram of fig. 4, and presetting the distance of the induction coil and the welding current; welding, moving the welding table according to the size of the product, 100 x 100mm per area2The welding and heat preservation time is less than 30 seconds.
And (4) after welding, loosening the tool, taking out the product, pressing the cover plate by using a metal block along a solder paste route, and naturally cooling.
At present, the screw material is generally copper material, the nut and the washer are stainless steel, the temperature rises faster under induced current, and in order to avoid influencing welding quality and product performance, the screw nut can not be installed in advance, so that the welding quality is better.
When the cover plate is not provided with the screw and the nut, the tool clamp is simpler and more convenient to manufacture and use; when the cover plate is not provided with the screw nuts, certain pressure is easier to apply to the solder paste welding position when the product is cooled, and the welding quality is ensured.
The working principle of the invention is as follows: for realizing the purpose of welding, the thickness of a steel mesh or similar articles used for printing is 0.1 to 0.15mm, and the thickness of solder paste is less than 0.25 mm; in order to realize rapid welding, the temperature of the preheating furnace is controlled at the conventional aging temperature of 80 +/-10 ℃; the invention adopts the pin positioning to reduce the deformation of the cover plate and realize the purpose of good contact; the invention can properly adopt the four corners and the middle of the screw with the spring gasket for positioning, thereby reducing the manufacturing difficulty of the clamp; in the welding process, a press-mounting positioning clamp made of ferromagnetic materials is avoided, and a tool for pressing a positioning cover plate is made of non-ferromagnetic materials; debugging the high-frequency induction welding time and the welding distance in advance, and setting parameters; positioning a cover plate by using a tool, loading a certain pressure on the cover plate, and welding; after welding, applying a metal pressing block along a solder paste welding line, and cooling; compared with the existing screw fixing mode, the screw fixing device has the advantages that the screw and assembly cost is reduced, the processing time of the cover plate and the cavity is shortened, the processing cost of the product is reduced, the weight of the product is reduced, the utilization rate of the cavity in the cavity is improved, the product performance is improved and the product competitiveness is improved under the condition that the same volume is required by customers.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection, a mechanical connection, or an electrical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.
Claims (10)
1. A method for assembling a cavity filter of a welded cover plate is characterized by comprising the following steps:
(1) positioning the cover plate through a positioning pin or a plurality of screws;
(2) the cover plate and the cavity ribs are separated by a tin paste layer;
(3) the cover plate and the cavity are assembled and then preheated;
(4) carrying out high-frequency induction welding on the preheated product;
(5) and cooling to obtain a welding qualified product.
2. The method for assembling a cavity filter of a welded cover plate according to claim 1, wherein the cover plate is positioned by 3 positioning pins in step (1), and the cavity and the cover plate are pre-tightened by using a jig.
3. The assembly method of claim 2, wherein in the step (1), the cover plate is positioned at the two sides and the middle part of the cover plate by a few screws, and the screws are provided with spring washers for pre-assembling the cover plate.
4. The method for assembling the cavity filter of the welded cover plate according to claim 1, wherein in the step (2), solder paste is printed on the contact surface of the cover plate and the cavity rib, and the width of the solder paste is smaller than that of the cavity rib at the contact position of the cover plate.
5. The method for assembling a cavity filter of a welded cover plate according to claim 4, wherein the thickness of the steel mesh used in the solder paste printing process is 0.1 to 0.15mm, and the thickness of the solder paste layer is less than 0.25 mm.
6. The assembly method of claim 4, wherein a tin-bismuth-silver low-temperature solder paste is selected during the solder paste printing process, and the tin-bismuth-silver low-temperature solder paste is different from a tin-silver-copper solder wire for input/output port soldering.
7. The method for assembling a cavity filter of a welded cover plate according to claim 1, wherein the pre-assembled product in step (3) is preheated in a preheating furnace at a temperature in the range of 80 ℃ ± 10 ℃ in a conventional aging temperature.
8. The method for assembling a cavity filter of a welded cover plate according to claim 1, wherein in the step (4), the high frequency induction welding is used, and in the high frequency induction welding process, when the welding size of the cover plate and the cavity is less than or equal to 100mm x 100mm, the welding and heat preservation time is less than 0.5min, when the welding size of the cover plate and the cavity is less than or equal to 200mm x 200mm, the welding and heat preservation time is less than 1min, when the welding size of the cover plate and the cavity is less than or equal to 500mm x 500mm, the welding and heat preservation time is less than 5min, and the larger welding is performed by displacement.
9. The method as claimed in claim 8, wherein the duration of the high frequency induction welding is controlled by controlling the current and the distance between the induction coil and the product during the high frequency induction welding.
10. The cavity filter assembling method of claim 1, wherein in the step (5), the accelerated cooling is performed by applying a metal compact along a solder paste bonding line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811596060.9A CN111370836A (en) | 2018-12-26 | 2018-12-26 | Cavity filter assembling method for welding cover plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811596060.9A CN111370836A (en) | 2018-12-26 | 2018-12-26 | Cavity filter assembling method for welding cover plate |
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| Publication Number | Publication Date |
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| CN111370836A true CN111370836A (en) | 2020-07-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811596060.9A Pending CN111370836A (en) | 2018-12-26 | 2018-12-26 | Cavity filter assembling method for welding cover plate |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4119166C2 (en) * | 1991-06-11 | 1998-10-01 | Lenser Kunststoff Preswerk Gmb | Filter element for a filter press |
| CN103050763A (en) * | 2012-12-28 | 2013-04-17 | 成都泰格微波技术股份有限公司 | Quick welding process for cavity filter |
| CN105489997A (en) * | 2015-11-24 | 2016-04-13 | 武汉凡谷电子技术股份有限公司 | Assembling technology for metal cover board and cavity component of cavity filter |
| EP3375036A1 (en) * | 2015-11-13 | 2018-09-19 | CommScope Italy S.r.l. | Filter assemblies, tuning elements and method of tuning a filter |
-
2018
- 2018-12-26 CN CN201811596060.9A patent/CN111370836A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4119166C2 (en) * | 1991-06-11 | 1998-10-01 | Lenser Kunststoff Preswerk Gmb | Filter element for a filter press |
| CN103050763A (en) * | 2012-12-28 | 2013-04-17 | 成都泰格微波技术股份有限公司 | Quick welding process for cavity filter |
| EP3375036A1 (en) * | 2015-11-13 | 2018-09-19 | CommScope Italy S.r.l. | Filter assemblies, tuning elements and method of tuning a filter |
| CN105489997A (en) * | 2015-11-24 | 2016-04-13 | 武汉凡谷电子技术股份有限公司 | Assembling technology for metal cover board and cavity component of cavity filter |
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Application publication date: 20200703 |
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