阅读说明：本技术 一种深盲腔射频连接器内导体焊接结构及回流焊接方法 (Inner conductor welding structure and reflow soldering method of deep blind cavity radio frequency connector ) 是由 吴瑛 陈该青 许春停 徐幸 刘颖 梁孟 付任 倪靖伟 于 2020-05-08 设计创作，主要内容包括：一种深盲腔射频连接器内导体焊接结构,涉及毫米波无源组件制造工艺技术领域,解决如何提高深盲腔毫米波微波组件的射频连接器内导体的焊接质量；包括射频连接器内导体、波导壳体、内导体安装孔和专用焊料孔,内导体安装孔是在波导壳体内部加工成型的孔,专用焊料孔是从波导壳体侧面垂直于所述的内导体安装孔加工成型的孔；内导体安装孔的直径大于射频连接器内导体的直径,内导体安装孔的深度大于射频连接器内导体的长度；内导体安装孔和专用焊料孔相互贯通形成通孔,内导体安装孔的中心线与专用焊料孔的中心线相交；焊接方法包括焊前清洗；刷助焊剂、搪锡去金；搪锡清洗；安装射频连接器内导体；预置焊料；回流焊接；焊接质量检查。(A deep blind cavity radio frequency connector inner conductor welding structure relates to the technical field of millimeter wave passive component manufacturing process, and solves the problem of how to improve the welding quality of a deep blind cavity millimeter wave microwave component inner conductor of a radio frequency connector; the radio frequency connector comprises a radio frequency connector inner conductor, a waveguide shell, an inner conductor mounting hole and a special solder hole, wherein the inner conductor mounting hole is a hole formed in the waveguide shell in a machining mode, and the special solder hole is a hole formed in a mode that the side face of the waveguide shell is perpendicular to the inner conductor mounting hole in a machining mode; the diameter of the inner conductor mounting hole is larger than that of the inner conductor of the radio frequency connector, and the depth of the inner conductor mounting hole is larger than the length of the inner conductor of the radio frequency connector; the inner conductor mounting hole and the special solder hole are communicated with each other to form a through hole, and the center line of the inner conductor mounting hole is intersected with the center line of the special solder hole; the welding method comprises cleaning before welding; brushing soldering flux and removing gold by tin coating; cleaning tin coating; installing an inner conductor of the radio frequency connector; solder is preset; reflow soldering; and (6) checking the welding quality.)

1. The inner conductor welding structure of the deep blind cavity radio frequency connector is characterized by comprising a waveguide shell (2), an inner conductor mounting hole (3) and a special welding material hole (4), wherein the inner conductor mounting hole (3) is a hole formed in the waveguide shell (2) in a machining mode, and the special welding material hole (4) is a hole formed in the side face of the waveguide shell (2) in a machining mode; the inner conductor mounting hole (3) is communicated with the special welding material hole (4), and the central lines of the inner conductor mounting hole and the special welding material hole are intersected to form a certain angle; the radio frequency connector inner conductor (1) is arranged in the inner conductor mounting hole (3), and the special welding material hole (4) is used for presetting welding materials for welding.

2. The welding structure of the inner conductor of the deep blind cavity radio frequency connector according to claim 1, wherein the inner conductor mounting hole (3) and the inner conductor (1) of the radio frequency connector are arranged on the same symmetry axis.

3. The welding structure of the inner conductor of the deep blind cavity radio frequency connector according to claim 2, characterized in that the center line of the inner conductor mounting hole (3) is perpendicularly intersected with the center line of the special solder hole (4).

4. The welding structure of the inner conductor of the deep blind cavity radio frequency connector according to claim 1, wherein the diameter of the inner conductor mounting hole (3) is larger than the diameter of the inner conductor (1) of the radio frequency connector, and the depth of the inner conductor mounting hole (3) is larger than the length of the inner conductor (1) of the radio frequency connector.

5. The structure for soldering the inner conductor of the deep blind cavity radio frequency connector, according to claim 1, wherein the diameter of the dedicated solder hole (4) is larger than that of a conventional solder wire or larger than the outer diameter of a conventional solder paste syringe.

6. The welding structure of the inner conductor of the deep blind cavity radio frequency connector according to claim 1, characterized in that the welding structure of the inner conductor of the deep blind cavity radio frequency connector further comprises a welding tool (5) and a screw (6), and for the split radio frequency connector, the welding tool (5) and the screw (6) are used for assembling and fixing the inner conductor (1) of the radio frequency connector on the waveguide shell (2); for the integrated radio frequency connector, the welding tool (5) and the screw (6) are used for assembling and fixing the connector on the waveguide shell (2).

7. The welding structure of the inner conductor of the deep blind cavity radio frequency connector according to claim 1, wherein when the radio frequency connector is an integral radio frequency connector, the welding structure of the inner conductor of the deep blind cavity radio frequency connector further comprises an outer conductor (7), an outer conductor mounting hole (8) and an outer conductor solder groove (9), wherein the outer conductor mounting hole (8) is a round hole formed at the end of the waveguide shell 2, the depth of the round hole is the same as the length of the outer conductor (7) of the integral radio frequency connector, and the diameter of the round hole is the same as the diameter of the outer conductor (7) of the integral radio frequency connector; the outer conductor solder groove (9) is a step-shaped annular groove processed on the end face of the waveguide shell 2, the circle center of the outer conductor solder groove and the circle center of the outer conductor mounting hole (8) are on the same straight line, and the diameter of the outer conductor solder groove is larger than that of the outer conductor mounting hole (8).

8. A reflow soldering method applied to the inner conductor soldering structure of the deep blind cavity radio frequency connector according to the claims 1-6, is characterized by comprising the following steps:

the method comprises the following steps: cleaning an inner conductor (1), a waveguide shell (2), an inner conductor mounting hole (3) and a special solder hole (4) of the radio frequency connector by using absolute ethyl alcohol and drying the cleaned inner conductor;

step two: brushing soldering flux on a part to be welded of an inner conductor (1) of the radio frequency connector, setting the temperature of a tin pot, controlling tin coating time, and carrying out tin coating and gold removing on the part to be welded;

step three: cleaning tin-coating gold-removing parts of the inner conductor (1) of the radio frequency connector by using absolute ethyl alcohol and drying the tin-coating gold-removing parts;

step four: brushing soldering flux on a to-be-welded part of an inner conductor (1) of the radio frequency connector, installing the inner conductor (1) of the radio frequency connector into an inner conductor mounting hole (3), fixing the inner conductor (1) of the radio frequency connector by using a welding tool, and fixing the welding tool and a waveguide shell (2) by using screws;

step five: solder is preset in the special solder hole (4) on the side surface of the waveguide shell (2) until the special solder hole (4) is filled with the solder, and an X-ray detection instrument is used for detecting the solder to ensure that the solder reaches the root of the special solder hole (4);

step six: setting a welding temperature curve, and putting the assembled radio frequency connector and the waveguide shell (2) into a vacuum vapor phase furnace for vacuum vapor phase welding;

step seven: and after reflow soldering is finished, cooling the assembled radio frequency connector and the waveguide shell (2) to room temperature, and detecting the welding quality of the inner conductor (1) of the radio frequency connector by using an X-ray detection instrument.

9. The reflow soldering method for the soldering structure of the inner conductor of the deep blind cavity radio frequency connector is characterized in that the first step further comprises the steps of cleaning the outer conductor (7), the outer conductor mounting hole (8) and the outer conductor solder groove (9) of the radio frequency connector of the integrated radio frequency connector by using absolute ethyl alcohol and airing; the second step also comprises the steps of brushing the part to be welded of the outer conductor (7) of the integrated radio frequency connector with soldering flux, setting the temperature of a tin pot, controlling the tin coating time, and carrying out tin coating and gold removing on the part to be welded; cleaning the tin-coating gold-removing part of the outer conductor (7) of the integrated radio frequency connector by using absolute ethyl alcohol and drying the tin-coating gold-removing part; the fourth step also comprises the steps of brushing soldering flux on the to-be-welded part of the outer conductor (7) of the integrated radio frequency connector, placing the part into an outer conductor mounting hole (8), and fixing the radio frequency connector by using a welding tool; step five, quantitatively presetting solder in an outer conductor solder groove (9); the seventh step also comprises the step of detecting the welding quality of the outer conductor (7) of the integrated radio frequency connector by using X-ray.

10. The reflow soldering method for the inner conductor soldering structure of the deep blind cavity radio frequency connector according to claim 8 or 9, wherein in the second step, the soldering flux is R-type soldering flux, the temperature of a tin pot is 260 ℃, and the tin coating time is 2 s; and fifthly, the solder in the step five is a solder wire or solder paste, and the diameter of the solder wire is 0.5 mm.

Technical Field

The invention belongs to the technical field of millimeter wave passive component manufacturing processes, and particularly relates to a deep blind cavity radio frequency connector inner conductor welding structure and a reflow soldering method.

Background

With the development of a new generation mobile access network system to the high frequency band, multi-beam, high power, large capacity and high integration direction, more rigorous requirements are put forward on millimeter wave microwave components: light weight, high strength, high gain, low differential loss, high isolation and the like. In order to meet the requirements of electrical indexes such as excellent conductive connection and low loss of microwave signal transmission, a large number of millimeter wave microwave assemblies adopt structural designs of complex channels, deep blind cavities and special-shaped structures, the structural forms determine that microwave signal transmission is realized by adopting a waveguide air medium, the feed connection quality of a port directly influences the electrical connection performance of the millimeter wave microwave assemblies, most of the feed connection of the port is realized by a radio frequency connector, and the radio frequency connector is an integrated radio frequency connector and a separated radio frequency connector as shown in fig. 1, fig. 2 and fig. 3.

The radio frequency connector is widely applied to various microwave assemblies in aerospace and aviation because of the advantages of small volume, light weight, excellent anti-seismic performance, good radio frequency performance, low loss, capability of being assembled quickly and the like. Because the welding structure has better grounding effect, mechanical property and sealing property, the feed connection of the microwave component generally adopts the welding mode of the radio frequency connector and the waveguide shell, namely, the inner conductor of the radio frequency connector is directly welded in the inner conductor mounting hole of the waveguide shell, and because the complex channel and deep blind cavity waveguide shell structure of the millimeter wave microwave component are realized by adopting the tailor-welding mode, the internal structure of the waveguide shell is complex, and when the feed connection is carried out with the inner conductor of the radio frequency connector, the welding part of the inner conductor of the radio frequency connector is often invisible, so that the problem of poor welding quality is caused.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: how to improve the welding quality of the inner conductor of the radio frequency connector of the deep blind cavity millimeter wave microwave component.

The invention solves the technical problems through the following technical scheme.

A deep blind cavity radio frequency connector inner conductor welding structure comprises a waveguide shell (2), an inner conductor mounting hole (3) and a special welding material hole (4), wherein the inner conductor mounting hole (3) is a hole formed in the waveguide shell (2) in a machining mode, and the special welding material hole (4) is a hole formed in the side face of the waveguide shell (2) in a machining mode; the inner conductor mounting hole (3) is communicated with the special welding material hole (4), and the central lines of the inner conductor mounting hole and the special welding material hole are intersected to form a certain angle; the radio frequency connector inner conductor (1) is arranged in the inner conductor mounting hole (3), and the special welding material hole (4) is used for presetting welding materials for welding.

According to the welding structure of the inner conductor of the deep blind cavity radio frequency connector, the special process hole penetrating through the side face of the shell is designed from the direction perpendicular to the installation direction of the inner conductor, so that the inner conductor installation hole and the special solder hole are mutually penetrated to form the through hole, the through hole reflow welding of the inner conductor in the deep blind cavity is realized, the problems that the internal structure of the waveguide shell is complex in the prior art, the welding part of the inner conductor of the radio frequency connector is often invisible when the inner conductor is in feed connection with the radio frequency connector, and the welding quality is difficult to ensure are solved, and the welding quality is improved; the special solder hole ensures the solder amount of the welding part of the inner conductor on one hand, and improves the reliability of the welding spot as the vent hole in the welding process of the inner conductor on the other hand.

As a further improvement of the technical scheme of the invention, the inner conductor mounting hole (3) and the inner conductor (1) of the radio frequency connector are arranged on the same symmetry axis.

As a further improvement of the technical scheme of the invention, the center line of the inner conductor mounting hole (3) is vertically intersected with the center line of the special solder hole (4).

As a further improvement of the technical scheme of the invention, the diameter of the inner conductor mounting hole (3) is larger than that of the inner conductor (1) of the radio frequency connector, and the depth of the inner conductor mounting hole (3) is larger than the length of the inner conductor (1) of the radio frequency connector.

As a further improvement of the technical scheme of the invention, the diameter of the special solder hole (4) is larger than that of the conventional solder wire or larger than the outer diameter of the conventional solder paste needle tube.

As a further improvement of the technical scheme of the invention, the inner conductor welding structure of the deep blind cavity radio frequency connector further comprises a welding tool (5) and a screw (6), wherein the welding tool (5) and the screw (6) are used for fixing the radio frequency connector during integrated welding.

A reflow soldering method applied to the inner conductor soldering structure of the deep blind cavity radio frequency connector comprises the following steps:

the method comprises the following steps: cleaning an inner conductor (1), a waveguide shell (2), an inner conductor mounting hole (3) and a special solder hole (4) of the radio frequency connector by using absolute ethyl alcohol and drying the cleaned inner conductor;

step two: brushing soldering flux on a part to be welded of an inner conductor (1) of the radio frequency connector, setting the temperature of a tin pot, controlling tin coating time, and carrying out tin coating and gold removing on the part to be welded;

step three: cleaning tin-coating gold-removing parts of the inner conductor (1) of the radio frequency connector by using absolute ethyl alcohol and drying the tin-coating gold-removing parts;

step four: brushing soldering flux on a to-be-welded part of an inner conductor (1) of the radio frequency connector, installing the inner conductor (1) of the radio frequency connector into an inner conductor mounting hole (3), fixing the inner conductor (1) of the radio frequency connector by using a welding tool, and fixing the welding tool and a waveguide shell (2) by using screws;

step five: solder is preset in the special solder hole (4) on the side surface of the waveguide shell (2) until the special solder hole (4) is filled with the solder, and an X-ray detection instrument is used for detecting the solder to ensure that the solder reaches the root of the special solder hole (4);

step six: setting a welding temperature curve, and putting the assembled radio frequency connector and the waveguide shell (2) into a vacuum vapor phase furnace for vacuum vapor phase welding;

step seven: and after reflow soldering is finished, cooling the assembled radio frequency connector and the waveguide shell (2) to room temperature, and detecting the welding quality of the inner conductor (1) of the radio frequency connector by using an X-ray detection instrument.

As a further improvement of the technical scheme of the invention, the first step further comprises cleaning an outer conductor (7), an outer conductor mounting hole (8) and an outer conductor solder groove (9) of the radio frequency connector of the integrated radio frequency connector by using absolute ethyl alcohol and airing; the second step also comprises the steps of brushing the part to be welded of the outer conductor (7) of the integrated radio frequency connector with soldering flux, setting the temperature of a tin pot, controlling the tin coating time, and carrying out tin coating and gold removing on the part to be welded; cleaning the tin-coating gold-removing part of the outer conductor (7) of the integrated radio frequency connector by using absolute ethyl alcohol and drying the tin-coating gold-removing part; the fourth step also comprises the steps of brushing soldering flux on the to-be-welded part of the outer conductor (7) of the integrated radio frequency connector, placing the part into an outer conductor mounting hole (8), and fixing the radio frequency connector by using a welding tool; step five, quantitatively presetting solder in an outer conductor solder groove (9); the seventh step also comprises the step of detecting the welding quality of the outer conductor (7) of the integrated radio frequency connector by using X-ray.

As a further improvement of the technical scheme of the invention, in the second step, the soldering flux is R-type soldering flux, the temperature of a tin pot is 260 ℃, and the tin coating time is 2 s; and fifthly, the solder in the step five is a solder wire or solder paste, and the diameter of the solder wire is 0.5 mm.

The invention has the advantages that:

(1) according to the welding structure of the inner conductor of the deep blind cavity radio frequency connector, the special process hole penetrating through the side face of the shell is designed from the direction perpendicular to the installation direction of the inner conductor, so that the inner conductor installation hole and the special solder hole are mutually penetrated to form the through hole, the through hole reflow welding of the inner conductor in the deep blind cavity is realized, the problems that in the prior art, the internal structure of the waveguide shell is complex, the welding part of the inner conductor of the radio frequency connector is often invisible when the inner conductor is in feed connection with the radio frequency connector, and the welding quality is difficult to ensure are solved, and the welding quality is improved.

(2) The special solder hole of the inner conductor welding structure of the deep blind cavity radio frequency connector ensures the solder amount of the welding part of the inner conductor on one hand, and improves the reliability of welding points as the vent hole in the welding process of the inner conductor on the other hand.

(3) According to the reflow soldering method of the inner conductor soldering structure of the deep blind cavity radio frequency connector, the assembly precision of the connector on the shell is improved through the special soldering tool, the coaxiality of the connector is guaranteed, the stability and consistency of the soldering quality of the connector are effectively guaranteed by adopting integrated soldering, and the electrical performance index of a high frequency band of a millimeter wave microwave assembly is realized.

(4) According to the reflow soldering method of the conductor soldering structure in the deep blind cavity radio frequency connector, two X-ray detection procedures are set in the connector soldering process to detect the soldering quality of the connector, and the product reject ratio is reduced.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a split RF connector;

FIG. 2 is an exploded view of the split RF connector;

FIG. 3 is a schematic cross-sectional view of the split deep blind cavity RF connector inner conductor solder structure of the present invention taken along the inner conductor mounting hole centerline and parallel to the dedicated solder hole centerline;

FIG. 4 is a schematic cross-sectional view of the solder connection of the inner conductor of the split deep blind cavity RF connector of the present invention along the center line of the inner conductor mounting hole and perpendicular to the center line of the dedicated solder hole;

FIG. 5 is a schematic structural view of an integral radio frequency connector;

FIG. 6 is a schematic cross-sectional view of the inner conductor soldering structure of the integrated deep blind cavity RF connector of the present invention along the center line of the inner conductor mounting hole and parallel to the center line of the dedicated solder hole;

FIG. 7 is a schematic view of a solder cross-section of the inner conductor solder structure of the integral deep blind cavity RF connector of the present invention along the center line of the inner conductor mounting hole and parallel to the center line of the dedicated solder hole;

fig. 8 is a flow chart of a reflow soldering method of the inner conductor soldering structure of the deep blind cavity radio frequency connector according to the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The technical scheme of the invention is further described by combining the drawings and the specific embodiments in the specification: