A gold-removing and tin-dipping tooling for SMP and insulator electrical connectors

Abstract

In view of the requirement that SMP and insulator electrical connectors need to be de-gilded and tinned before welding, the present invention provides a de-gilding and tinning tooling for SMP and insulator electrical connectors. By using its own resilience restoring force, it internally supports and clamps the electrical connector without external force operation. The internal clamping not only realizes the picking up of the electrical connector but also ensures the distance control during the tinning operation. At the same time, this tooling uses the resilience force, reducing the labor intensity of the operator, eliminating the risks of device damage and device dropping, enabling rapid replacement of the electrical connector, and improving the tinning efficiency and reliability. The structure of the present invention is delicate and the operation is simple, and it can be used to achieve precise de-gilding and tinning operations for SMP and insulator electrical connectors.

Description

Technical Field

[0001] The present invention relates to the technical field of gold removal and tin coating for electronic components, and particularly to the design of a gold removal and tin coating tooling for SMP and insulator type electrical connectors. Background Art

[0002] In recent years, with the usage requirements in the fields of phased array radars, aviation, and aerospace, ultra-small push-in type RF connectors represented by SMP, as high-performance connectors for the insulation support interface, have been widely used in military and civilian RF communication fields due to their characteristics of small size, light weight, convenient use, wide operating frequency band, and strong anti-vibration and shock resistance.

[0003] Taking the production of SMP electrical connectors by a certain factory as an example, they are usually formed by sintering kovar alloy and glass insulators. Refer to Figure 1 In order to ensure the effective storage of electrical connectors, and at the same time due to the requirements of high-frequency use and electrical performance connection, the entire electrical connector is surface gold-plated. Therefore, during the electronic assembly operation, the gold-plated layer of the pins of the electrical connector body will melt into the solder joints, producing brittle gold-tin intermetallic compounds, and when reaching a certain weight ratio, it is extremely easy to cause the solder joints to crack and fail due to the gold embrittlement problem. Therefore, solving the process and reliability problems brought by the gold-plated layer is a condition for ensuring the highly reliable use of such electrical connectors. According to the relevant standard requirements, gold-plated devices must be subjected to gold removal and tin coating treatment before welding to ensure the reliability of the solder joints. However, due to the ultra-small structural size of SMP electrical connectors and the circumferential structure of the body, it is not conducive to tin coating with a soldering iron; and when performing tin coating in a tin pot, it is also not conducive to clamping and tin coating with tweezers, and the device is extremely easy to fall off or be lost during the clamping process.

[0004] Therefore, how to solve the gold removal and tin coating operations for SMP and insulator type electrical connectors and precisely control the tin coating position is a technical problem that needs to be solved by the technical personnel of the present invention. Summary of the Invention

[0005] In response to the requirement that SMP and insulator type electrical connectors need to be subjected to gold removal and tin coating before welding, the present invention provides a gold removal and tin coating tooling for SMP and insulator type electrical connectors. The structure of the present invention is delicate and the operation is simple, and it can be used to achieve precise gold removal and tin coating operations for SMP and insulator type electrical connectors.

[0006] In order to achieve the above object, the present invention provides a gold-removing and tin-plating tooling for SMP and insulator electrical connectors, including a forward herringbone tweezer arm and a tin-plating end head. One end of the tweezer arm is used for fixedly connecting two symmetrically placed forward clamping arms, and the other end is separated to form a herringbone or inverted-V structure. When not in clamping, the tin-plating end head is in an open herringbone state. When approaching and fitting, the two tin-plating end heads are joined together to form a hollow cylinder, facilitating internal embedded support and clamping, and then realizing vertical insertion into a tin pot for gold-removing and tin-plating operations.

[0007] In the above tooling structure, for the herringbone tweezer arm, there are 2 mounting holes at the end of the open herringbone tweezer arm for mounting the tin-plating end head. The tin-plating end head and the tweezer arm can be fixedly installed through screws and nuts.

[0008] In the above tooling structure, the tin-plating end head includes two structures: a mounting handle and a hollow semi-cylinder. The two structures are integrally designed. One end is used for mounting on the tweezer arm, and the other end is used for internally embedded elastic support of SMP and insulator electrical connectors and protecting the inner core of the electrical connector.

[0009] In the above tooling structure, the mounting handle of the tin-plating end head is provided with mounting holes that correspond to and match the herringbone tweezer arm, and the number of mounting holes is 2 for fixing the tin-plating end head.

[0010] In the above tooling structure, when the ends of the tin-plating end head are fitted, they form a hollow cylindrical structure. When opened, they each form a semi-cylinder with a groove inside. The length of the cylinder is not greater than the inner cavity depth of the SMP and insulator electrical connectors. The outer diameter of the cylinder is not greater than the inner diameter of the SMP and insulator electrical connectors. The inner diameter of the central groove of the cylinder is not less than the inner core diameter of the SMP and insulator electrical connectors.

[0011] In the above tooling structure, the tin-plating end head is made of aluminum alloy material.

[0012] In the above tooling structure, the herringbone tweezer arm is made of stainless steel.

[0013] When in use, the gold-removing and tin-plating tooling for SMP and insulator electrical connectors of the present invention presses the tweezer arm to cause the two side herringbone tweezer arms to converge inward. Then, the two hollow semi-cylindrical tin-plating end heads are closed and embedded into the inner wall of the SMP and insulator electrical connectors. Then, release the pressure on the tweezer arm to allow the tweezer arm to naturally rebound. Use its own rebound restoring force and the two semi-cylinders of the tin-plating end head to support the inner wall of the electrical connector to ensure that the electrical connector does not fall off. Then, slowly insert it into the gold-removing and tin-plating tin pot for gold-removing and tin-plating, and then slowly insert it into the tin-plating tin pot for secondary tin-plating operation.

[0014] Compared with the prior art, the present invention has the following innovative effects:

[0015] 1) The tooling described in the present invention uses its own resilience to internally support and clamp the electrical connector without external force operation. The internal clamping not only realizes the picking up of the electrical connector but also ensures the distance control during the tinning operation. At the same time, this tooling uses the resilience, reducing the labor intensity of the operator and eliminating the risks of device damage and device dropping. The electrical connector can be replaced quickly, improving the tinning efficiency and reliability.

[0016] 2) The tinning end of the tooling provided in the present invention is designed and processed into a hollow semi-cylindrical structure. While realizing the internal support and fixation of the device, it also better protects the circumferential structure of the inner arm of the device and the internal insert core. The semi-circular structure can avoid support deformation and ensure the reliability of clamping.

[0017] 3) The tinning end of the present invention is made of aluminum alloy, which can ensure the heat dissipation requirements of MP and insulator electrical connectors during tinning. At the same time, aluminum is lightweight and has high strength, and can be reused.

[0018] 4) The tooling structure of the present invention is exquisitely designed and easy to operate, ensuring the reliability of the tinning operation. Brief Description of the Drawings

[0019] A gold-removing and tinning tooling for SMP and insulator electrical connectors of the present invention is given by the following embodiments and drawings.

[0020] Figure 1 It is a schematic diagram of the SMP electrical connector structure in the present invention;

[0021] Figure 2 It is a schematic diagram of the tinning end in the present invention;

[0022] Figure 3 It is a schematic diagram of the open state of the tinning tooling in the present invention;

[0023] Reference numeral sequence: 1 herringbone tweezer arm, 2 tinning end, 3 mounting hole, 4 mounting handle, 5 hollow semi-cylinder; Detailed Description of the Invention

[0024] To more clearly express the solutions, objectives, and innovations of the present invention, the following takes a specific example in combination with the drawings to further elaborate on the operation of the tooling of the present invention:

[0025] 1) Prepare and check the relevant equipment for tinning, including the gold-removing tin pot, tinning tin pot, and dust removal of the smoke purification system, etc., ensure the normal operation of the equipment, and turn on the dust removal system;

[0026] 2) Prepare and check the preparation of relevant tools for tinning, including the tinning tooling, hydrogenated rosin solution, absolute ethanol, deionized water, solder wick, solder resist glue, etc.;

[0027] 3) Before operation, count the number of the chassis, printed circuit board, and SMP electrical connectors to be welded, check that the device models meet the requirements of the documents, the circumference of the outer shell of the electrical connector is smooth, the gold plating layer is uniform, and the center pin is perpendicular and free of deviation. Electrical connectors with uneven plating or pin deviation should be removed; and clean them with anhydrous ethanol to remove the grease contaminants on the surface;

[0028] 4) Adjust the temperature of the tinning (gold removal) tin pot to 250 °C, turn on the exhaust system, and keep the tin pot warm for use;

[0029] 5) Take out an appropriate amount of solder resist glue, stir it evenly, and then perform solder resist protection on the tail pins of the electrical connector to avoid the tinning position of the pins being too high. After solder resist protection, place it for use to prepare for gold removal and tinning of the electrical connector;

[0030] 6) Take out the tinning tooling, use one hand to control and squeeze the tweezer arm tightly, keep the hollow semi-cylinders at the tinning end merged, then insert it into the SMP electrical connector, then release and loosen the tweezer arm, keep the tweezer arm naturally rebound, ensure that the two semi-cylinders are close to support the inside of the electrical connector, and then place it vertically downward, observe the electrical connector to confirm that the electrical connector does not fall off;

[0031] 7) Set the temperature of the gold removal tin pot to 250 °C, keep the tweezers of the tinning tooling inserted vertically and slowly into the gold removal tin pot for tinning the outer wall of the electrical connector. The tinning height is 2 / 3 of the solder cup height of the electrical connector, then slowly take out the electrical connector, press the tweezer arm inward to fit the tinning end, release the elastic support, unload the device, and wait for it to cool slowly to room temperature;

[0032] 8) Manually remove the solder resist glue on the surface of the tail pins, then fix the electrical connector with the tooling tweezers again, keep the temperature of the tin pot set at 250 °C, keep the tooling inserted vertically and slowly into the gold removal tin pot for gold removal and tinning of the tail pins, then slowly take out the electrical connector, release the electrical connector, and wait for it to cool slowly to room temperature;

[0033] 9) Put the SMP radio frequency electrical connector cooled to room temperature (with solidified rosin attached) into an anti-static tray filled with anhydrous ethanol for immersion cleaning. After the solidified rosin on the device bends and dissolves, gently brush the device pins along the surface of the device with an anti-static soft brush. Do not use excessive force to avoid damaging the device pins. The brushing time should be controlled within 3 minutes as much as possible;

[0034] 10) After cleaning, take out the device and let it dry at room temperature.

[0035] The above only discloses a specific embodiment of the present invention, but this application is not limited to this device. Any person skilled in the art of this field and this method applying this method to other devices and other application variations belongs to the protection scope of this application.

Claims

1. A de-gold and tin-plating tooling for SMP and insulator electrical connectors, characterized in that, The tooling includes a V-shaped tweezer arm and a tinned end. One end of the V-shaped tweezer arm is used to fixedly connect two symmetrically placed clamping arms, and the other end is separated to form a V-shaped or inverted-V-shaped structure. When not in use for clamping, the tinned ends are in an open V-shaped state. When approaching and fitting together, the two tinned ends are joined to form a hollow cylinder for internal embedded support and clamping. The tinned end includes two structures: a mounting handle and a hollow semi-cylinder. One end is used for mounting on the tweezer arm, and the other end is used for internal embedding of elastic support for SMP and insulator-type electrical connectors. When the ends of the tinned end are in contact, they form a hollow cylindrical structure. When opened, they each form a semi-cylinder with a groove inside. The length of the cylinder is not greater than the inner cavity depth of the SMP and insulator-type electrical connectors. The outer diameter of the cylinder is not greater than the inner diameter of the SMP and insulator-type electrical connectors. The inner diameter of the central groove of the cylinder is not less than the inner core diameter of the SMP and insulator-type electrical connectors. During use, squeeze the tweezer arm to keep the hollow semi-cylinders of the tinned end joined, then insert it into the electrical connector. Then release the tweezer arm and let it rebound naturally to ensure that the two semi-cylinders are pressed against and support the inside of the electrical connector. Then place it vertically downward and observe the electrical connector to confirm that it does not fall off. Press the tweezer arm inward to make the tinned ends fit together, release the elastic support, and remove the electrical connector.

2. A de-gold and tin-plating tooling for SMP and insulator electrical connectors according to claim 1, characterized in that, The end of the V-shaped tweezer arm is provided with a mounting hole for installing the tinned end.

3. A gold removal and tin plating tool for SMP and insulator type electrical connectors as claimed in claim 2, characterized in that: The mounting handle of the tinned end is provided with a mounting hole that corresponds and matches with the V-shaped tweezer arm for fixing the tinned end.

4. A de-gold and tin-plating tooling for SMP and insulator electrical connectors as described in claim 1, characterized in that, The tinned end is made of aluminum alloy material.

5. A de-gold and tin-plating tooling for SMP and insulator electrical connectors according to claim 1, characterized in that The V-shaped tweezer arm is made of stainless steel.

6. A gold-removing and tin-plating tooling for SMP and insulator electrical connectors according to claim 2, characterized in that, There are 2 mounting holes at the end of the V-shaped tweezer arm.

7. A tool for removing gold and tin plating for SMP and insulator type electrical connectors as claimed in claim 2, characterized in that: The tinned end and the tweezer arm can be installed and fixed by screws and nuts.

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