CN113523488B - Semi-rigid cable welding explosion-proof treatment method - Google Patents
Semi-rigid cable welding explosion-proof treatment method Download PDFInfo
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- CN113523488B CN113523488B CN202110917761.3A CN202110917761A CN113523488B CN 113523488 B CN113523488 B CN 113523488B CN 202110917761 A CN202110917761 A CN 202110917761A CN 113523488 B CN113523488 B CN 113523488B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
Abstract
The invention discloses a semi-rigid cable welding explosion-proof treatment method, which comprises the steps of carrying out electroplating strengthening treatment or tin coating strengthening treatment on a semi-rigid cable according to the welding assembly process temperature of the semi-rigid cable, and welding the treated semi-rigid cable to form a eutectic layer on the surface layer of the semi-rigid cable; the method has the advantages that the surface layer of the semi-rigid cable is subjected to strengthening treatment before welding, so that the situation that the shell bursts in the welding process of an operator is avoided, and the requirement on the operator in the welding process is reduced; the increase of the outer diameter of the cable and the increase of the bending radius of the cable are avoided, and the microwave radio frequency circuit is not affected.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a semi-rigid cable welding explosion-proof treatment method.
Background
The semi-rigid radio frequency cable comprises the following components in sequence from outside to inside: shield case (housing), dielectric, inner conductor (fig. 1). Wherein: the shell is mainly made of a metal copper pipe, has excellent electric conduction and heat conduction characteristics, and is convenient to form, and the shell is generally in a thinner specification with the thickness of 0.1-0.2 mm; the medium is usually formed by molding an organic material such as PTFE, and the difference between the thermal expansion coefficient (about 100ppm to 120ppm in a typical welding process temperature range) and the thermal expansion coefficient of the case (about 24ppm in a typical welding process temperature range) is large. For the reasons, the medium is prone to expand sharply after being heated up in the welding process, and the shell is extruded to burst, so that the functional performance index of the semi-rigid cable is seriously deteriorated.
A manual welding method is used in the assembling process, and the semi-rigid cable shell is prevented from bursting in the welding process by controlling the temperature of the electric iron, the moving speed of the electric iron during welding operation and the speed of feeding the tin wire. The temperature of the electricity removal iron can be controlled by a method for fixing equipment parameters such as a constant-temperature electric iron, and the rest of the equipment needs to be manually controlled by skilled operators, so that the process has higher requirements on the operators; the semi-rigid cable with the thicker shell is designed, and the strength of the shell is increased to bear the thermal expansion stress of a medium. However, under the condition of unchanged radio frequency performance, the outer diameter of the cable is increased, the bending radius of the cable is increased, and the integration level of the microwave radio frequency circuit is reduced.
In view of this, the present application is specifically made.
Disclosure of Invention
The invention aims to solve the technical problem of how to avoid the situation of shell burst of a cable and the increase of the bending radius of the cable when the semi-rigid cable is welded, and aims to provide a semi-rigid cable welding explosion-proof treatment method which can avoid the situation of shell burst or cable bending radius increase when the semi-rigid cable is welded.
The invention is realized by the following technical scheme:
according to the welding and assembling process temperature of the semi-rigid cable, the semi-rigid cable is subjected to electroplating strengthening treatment or tin coating strengthening treatment, and the treated semi-rigid cable is welded, so that a eutectic layer is formed on the surface layer of the semi-rigid cable.
When a semi-rigid cable is welded conventionally, the temperature of an electric soldering iron and the moving speed of the semi-rigid cable are controlled to directly weld the semi-rigid cable, but when the semi-rigid cable is welded by the method, the situation that the shell of the semi-rigid cable bursts or the bending radius of the cable is increased often occurs; the invention provides an explosion-proof treatment method for welding a semi-rigid cable, which is characterized in that before the semi-rigid cable is welded, the surface layer of the semi-rigid cable is subjected to electric strengthening treatment or tin coating strengthening treatment, so that the semi-rigid cable nominally forms a eutectic layer when the semi-rigid cable is welded, the case of shell explosion of the semi-rigid cable in the welding process is avoided, and the outer diameter of the cable is prevented from being increased.
Preferably, the explosion-proof processing method further comprises: before explosion-proof treatment in the semi-rigid cable, the semi-rigid cable is cut and shaped.
Preferably, the electroplating strengthening treatment or tin coating strengthening treatment of the semi-rigid cable according to the process temperature of the welding assembly of the semi-rigid cable is as follows:
when the process temperature of the semi-rigid cable welding assembly is less than or equal to 190 ℃, tin coating strengthening treatment is adopted on the semi-rigid cable surface layer;
and when the process temperature of the welding assembly of the semi-rigid cable is more than 190 ℃, the surface layer of the semi-rigid cable is subjected to electroplating strengthening treatment. Preferably, the specific method of the electroplating strengthening treatment comprises the following steps:
shielding and wrapping the cable end and the shell within the range of 1-2 mm by using an electroplating adhesive tape;
removing the surface coating of the exposed metal part of the cable to expose the copper substrate;
and plating a layer of metal film on the copper substrate by a metal electroplating process, wherein the metal film is used for improving the melting point of the solder.
Preferably, the metal thin film is nickel or gold or tin.
Preferably, the specific method of the tin coating strengthening treatment is constant-temperature tin pot tin coating strengthening treatment or wave soldering tin coating strengthening treatment.
Preferably, the specific steps of the constant-temperature tin pan strengthening treatment include:
putting the solder into a tin pot, and heating the tin pot until the solder in the tin pot is in a molten state;
and gradually putting one end of the semi-rigid cable into the molten solder, keeping the molten solder for 3-6 s, taking out the semi-rigid cable, and solidifying the molten solder covered on the surface of the semi-rigid cable shell to obtain the reinforced semi-rigid cable.
Preferably, the wave soldering tin coating strengthening treatment comprises the following specific steps:
setting relevant process parameters on wave soldering equipment based on the type of the solder alloy and the size of the cable;
fixing the semi-rigid cable shell at the position which is 5 mm-10 mm close to the end head in the semi-rigid cable clamp;
and (4) installing the clamp into the initial end of the guide rail, and welding the semi-rigid cable to obtain the reinforced semi-rigid cable.
Preferably, the semi-rigid cable comprises a shell, a dielectric layer and an inner conductor, wherein the shell covers the dielectric layer, the dielectric layer covers the inner conductor, the shell is a copper pipe, the dielectric layer is made of PTFE, and the inner conductor is a silver-plated copper clad steel wire.
Preferably, the soldering includes manual soldering, reflow soldering, and wave soldering.
The present invention exemplifies these welds, but is not limited to these methods of welding.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the semi-rigid cable welding explosion-proof processing method provided by the embodiment of the invention, the surface layer of the semi-rigid cable is subjected to strengthening processing before welding, so that the situation that the shell is cracked in the welding process of an operator is avoided, and the requirement on the operator in the welding process is reduced;
2. the semi-rigid cable welding explosion-proof processing method provided by the embodiment of the invention avoids the situations that the outer diameter of the cable is increased and the bending radius of the cable is increased, and cannot cause any influence on a microwave radio frequency circuit.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a flow chart of an explosion-proof processing method
FIG. 2 is a schematic cross-sectional view of a semi-rigid cable
FIG. 3 is a comparison of the weld after no strengthening treatment
FIG. 4 is a comparative diagram of a welding machine after strengthening treatment
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the scope of the present invention.
Example one
The embodiment discloses an explosion-proof treatment method for welding a semi-rigid cable, as shown in fig. 1, according to the process temperature of the welding assembly of the semi-rigid cable, the semi-rigid cable is subjected to electroplating strengthening treatment or tin coating strengthening treatment, and the treated semi-rigid cable is welded, wherein the welding comprises manual welding, reflow welding and wave soldering, but in the embodiment, the specific welding mode is not limited; causing a eutectic layer to form on a surface layer of the semi-rigid cable; the explosion-proof treatment method further comprises the following steps: and before explosion-proof treatment in the semi-rigid cable, cutting and shaping the semi-rigid cable.
In this embodiment, as shown in fig. 2, the semi-rigid cable that adopts includes shell, dielectric layer and inner conductor, the shell covers on the dielectric layer, the dielectric layer covers on the inner conductor, just the shell is the copper pipe, the dielectric layer that the dielectric layer is the PTFE material, the inner conductor is silver-plated copper clad steel wire, and on the top layer of semi-rigid cable, can have the cladding material also can not contain the cladding material, and carry out intensive treatment on semi-rigid cable top layer is for increasing shell intensity, can make and carry out welding process's in-process at semi-rigid cable, has avoided taking place the phenomenon of bursting when can not influencing its bending property.
The specific method comprises the following steps: preparing production materials such as semi-rigid cables according to a normal production flow; cutting and forming the semi-rigid cable according to a normal process technology;
the electroplating strengthening treatment or tin coating strengthening treatment of the semi-rigid cable according to the process temperature of welding and assembling the semi-rigid cable comprises the following steps:
when the process temperature of the semi-rigid cable welding assembly is less than or equal to 190 ℃, tin coating strengthening treatment is adopted on the semi-rigid cable surface layer; the specific method comprises the following steps: shielding and wrapping the cable end and the shell within the range of 1-2 mm by using an electroplating adhesive tape; removing the surface coating of the exposed metal part of the cable to expose the copper substrate;
plating a layer of metal film on the copper substrate through an electroplating metal process, wherein the metal film is used for improving the melting point of a solder, and the thickness of a cable shell is increased after the semi-rigid cable is formed through the electroplating metal process without influencing the circuit layout; the principle is as follows: the eutectic layer of the surface metal in the welding process is utilized to further increase the strength of the shell, and the welding burst is avoided. But electroless plating can also be selected to accommodate more complex bent cable profiles when the temperature does not exceed 210 ℃; the metal film is nickel or gold or tin, and the corresponding electroplating film process is respectively nickel electroplating process, gold electroplating process and tin electroplating process.
When the process temperature of the semi-rigid cable welding assembly is more than 190 ℃, electroplating strengthening treatment is adopted on the surface layer of the semi-rigid cable; the specific method for tin coating strengthening treatment comprises the following steps: and (3) adopting constant-temperature tin pot equipment or wave soldering equipment to carry out tin coating reinforcement on the shell of the semi-rigid cable.
The operation steps of using a tin pot to enamel the tin to carry out strengthening treatment on the cable are as follows:
1) Selecting a tin pot capable of containing the formed cable, placing the tin pot on a heating table, and setting a heating temperature according to the type of a solder alloy, wherein the heating temperature is generally +15 ℃ of a solder alloy liquid phase line;
2) Adding solder into the tin pot and waiting for the solder to melt;
3) Using tweezers or sharp-nose pliers to clamp the position of the cable shell, which is 5 mm-10 mm away from the end, and gradually immersing the cable into the molten solder from one end;
4) Each part of the cable ensures that 3S-6S is kept in a tin pot to ensure that the solder is fully soaked
5) Moving the cable out of the tin pot, waiting for several seconds until the solder on the surface of the shell is solidified, and placing the cable in a cooling area;
6) If the tin pot can not contain the complete cable, a method of sequentially enameling tin section by section can be adopted until the cable shell is fully enameling tin and is strengthened;
7) When the surface of the solder in the tin pot has a visible oxide layer, the visible oxide layer is removed in time.
The method comprises the following operation steps of adopting wave soldering equipment to carry out tin coating strengthening treatment on a cable:
1) Starting wave soldering equipment, and setting related process parameters such as preheating parameters, chain speed, wave parameters, tin temperature, flow and the like, wherein the process parameters are specifically set according to the type of a solder alloy and the size of a cable;
2) The semi-rigid cable is put into a special clamp, the position of the cable shell close to the end head is fixed by about 5 mm-10 mm, if the cable shape has a linear area with the diameter more than 40 times, cable fixing measures are added in the linear area;
3) Installing the welding fixture into the guide rail, placing the welding fixture at the initial end of the conveying guide rail, and starting a welding program;
4) And cooling after wave soldering is finished, checking the tin coating condition of the cable, and reworking again to meet the requirements if the strength is insufficient.
The tin-coating strengthening treatment is suitable for cables with nickel-plated and gold-plated shells, a constant-temperature tin pot or wave-soldering equipment is used, soldering tin with a corresponding alloy specification is selected for assembly and welding, tin coating strengthening is carried out on the cable shells, in the embodiment, the tin-coating infiltration process is ensured to be about 3-6 seconds, so that eutectic layers with melting points higher than that of soldering tin alloy are formed on the surfaces of the cable shells, the specific tin-coating infiltration time is not limited to 3-6 seconds, and the infiltration time is obtained according to practical research of products and process performance conditions: the short tin coating leads to insufficient thickness of the eutectic layer, and the strengthening effect is lower than expected; the tin-coating solder used can be selected from alloy solder used for assembly, and can also be a solder which has a melting point higher than that of the assembly solder and is not more than 30 ℃ and compatible in metallographic phase (not brittle and controllable in Coriolis effect).
As shown in fig. 3, the case is directly welded after the surface layer of the semi-rigid cable is not treated, as shown in fig. 4, the case is welded after the surface layer of the semi-rigid cable is treated, as can be directly seen from the figure, when the surface layer of the semi-rigid cable is not treated and is welded, the welding is completed, and the surface layer bursts; after the surface layer of the semi-rigid cable is subjected to strengthening treatment, the surface layer of the semi-rigid cable after welding does not burst.
Therefore, by adopting the explosion-proof processing method for welding the semi-rigid cable provided by the embodiment, before the semi-rigid cable is welded, the surface layer of the semi-rigid cable is subjected to strengthening processing, so that a eutectic layer is formed between the surface layer of the semi-rigid cable and the welding flux, the strength of the shell is increased, and the situation that the semi-rigid cable is directly cracked in the welding process is avoided.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The semi-rigid cable welding explosion-proof treatment method is characterized in that electroplating strengthening treatment or tin coating strengthening treatment is carried out on the semi-rigid cable according to the welding assembly process temperature of the semi-rigid cable, and then the treated semi-rigid cable is welded so that a eutectic layer is formed on the surface layer of the semi-rigid cable;
the semi-rigid cable comprises a shell, a dielectric layer and an inner conductor, wherein the shell is a copper pipe;
the electroplating strengthening treatment or tin coating strengthening treatment of the semi-rigid cable according to the process temperature of welding and assembling the semi-rigid cable comprises the following steps:
when the process temperature of the semi-rigid cable welding assembly is less than or equal to 190 DEG C o C, adopting tin coating strengthening treatment on the surface layer of the semi-rigid cable;
when the process temperature of the semi-rigid cable welding assembly is more than 190 DEG C o And C, electroplating the surface layer of the semi-rigid cable for strengthening.
2. The explosion-proof treatment method for welding the semi-rigid cable according to claim 1, further comprising the following steps: before the semi-rigid cable is welded and explosion-proof, the semi-rigid cable is cut and shaped.
3. The explosion-proof treatment method for welding semi-rigid cables as claimed in claim 1, wherein the specific method of electroplating strengthening treatment comprises:
shielding and wrapping the cable end and the shell within the range of 1-2 mm by using an electroplating adhesive tape;
removing the surface coating of the exposed metal part of the cable to expose the copper substrate;
and plating a metal film on the copper substrate by an electroplating metal process, wherein the metal film is used for improving the melting point of the copper substrate and is nickel, gold or tin.
4. The explosion-proof treatment method for semi-rigid cable welding according to claim 1, wherein the specific method of tin-coating strengthening treatment is constant temperature tin pot tin-coating strengthening treatment or wave soldering tin-coating strengthening treatment.
5. The explosion-proof treatment method for semi-rigid cable welding according to claim 4, wherein the specific steps of the constant temperature tin pot tin coating strengthening treatment comprise:
putting the solder into a tin pot, and heating the tin pot until the solder in the tin pot is in a molten state;
and gradually introducing one end of the semi-rigid cable into molten solder, maintaining the molten solder for 3 s-6 s, taking out the semi-rigid cable, and curing the molten solder covered on the surface of the semi-rigid cable shell to obtain the reinforced semi-rigid cable.
6. The explosion-proof treatment method for semi-rigid cable welding according to claim 4, wherein the specific steps of the wave soldering tin-coating strengthening treatment comprise:
setting relevant process parameters on wave soldering equipment based on the type of the solder alloy and the size of the cable;
placing the semi-rigid cable into a clamp, and fixing the part of the semi-rigid cable shell, which is 5-10 mm close to the end;
and (4) installing the clamp into the initial end of the guide rail, and welding the semi-rigid cable to obtain the reinforced semi-rigid cable.
7. The explosion-proof processing method for welding the semi-rigid cable according to any one of claims 1 to 6, wherein the semi-rigid cable comprises a shell, a dielectric layer and an inner conductor, the shell covers the dielectric layer, the dielectric layer covers the inner conductor, the shell is a copper pipe, the dielectric layer is a PTFE (polytetrafluoroethylene) material, and the inner conductor is a silver-plated copper-clad steel wire.
8. The explosion-proof processing method for semi-rigid cable soldering of claim 7, wherein the soldering includes manual soldering, reflow soldering and wave soldering.
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| CN202110917761.3A CN113523488B (en) | 2021-08-11 | 2021-08-11 | Semi-rigid cable welding explosion-proof treatment method |
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| CN113523488B true CN113523488B (en) | 2023-03-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2012181926A (en) * | 2011-02-28 | 2012-09-20 | Hitachi Cable Ltd | Coaxial cable connection structure and connection method |
| CN102904140B (en) * | 2012-09-28 | 2015-05-06 | 北京星航机电装备有限公司 | Cable shielding layer splicing method |
| JP5821825B2 (en) * | 2012-11-16 | 2015-11-24 | 日立金属株式会社 | Cable assembly and manufacturing method thereof |
| JP5904107B2 (en) * | 2012-11-30 | 2016-04-13 | 日立金属株式会社 | Cable connector, cable assembly, and method of manufacturing cable assembly |
| JP2017037800A (en) * | 2015-08-11 | 2017-02-16 | 住友電気工業株式会社 | Cable harness and manufacturing method of the same |
| CN105186253A (en) * | 2015-08-20 | 2015-12-23 | 京信通信技术(广州)有限公司 | Implementation method, application method and connection structure for welding tin-solderable conductor and tin-unsolderable matrix |
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