A welding process for transmission terminal and base

Abstract

The present invention discloses a welding process for a transmission terminal and a base. The key points of the technical solution are as follows: a welding fixture comprises a heat conducting block, an upper surface of the heat conducting block is provided with a socket for inserting the terminal from below, the upper surface of the heat conducting block is slidably provided with a clamping claw for positioning and clamping the terminal, and the heat conducting block is threadedly connected with a screw; an ejector pin for supporting the upper end of the terminal is installed at the upper end of the heat conducting block, the ejector pin is located above the socket, and the heat conducting block is provided with an elastic part for pushing the ejector pin to move downward. The welding process comprises the following steps: 1. placing a tin ring in the base and inserting the terminal into the sink groove of the base; 2. inserting the lower end of the terminal into the socket of the heat conducting block; 3. clamping the side of the positioning terminal with the clamping claw; 4. supporting the ejector pin at the upper end of the terminal; and 5. placing the heat conducting block with the terminal and the base installed on the heating block for heating and soldering; the yield rate of welding of terminals and bases with smaller volumes is improved.

Description

Technical Field

[0001] The present invention relates to a welding process for a transmission terminal, and more particularly to a welding process and a welding fixture for a transmission terminal. Background Art

[0002] High-speed transmission terminals are the most commonly used optoelectronic connectors in current communications.

[0003] There is a high-speed transmission terminal used in circuit boards. However, due to the small size of the terminal, which is about 1.5 cm long, about 0.7 cm wide, and about 0.2 cm high, the terminal itself is very small, and it is difficult to position the terminal and the circuit board when welding. The scrap rate is high when the terminal is directly welded to the circuit board, and welding can easily cause the terminal and the circuit board to be scrapped together.

[0004] To avoid terminal and circuit board scrap and waste rate, such as Figure 1 As shown, in reality, the terminal 1 is first welded to the circular base 2, and the contact surface with the circuit board is expanded by the circular base 2 to achieve a good yield rate of the installation of the circuit board and the terminal 1. Due to the small welding surface of the terminal 1, it is difficult to weld the terminal 1 and the circular base 2 in a more aesthetically pleasing manner by direct soldering. In addition, the amount of tin cannot be accurately controlled by using a soldering gun, which easily causes the solder liquid to seep to the edge of the disc, failing to meet customer requirements. During the welding process, the terminal 1 and the circular base 2 are welded by glass welding or silver-copper welding. The solder is now placed in the sink 21 of the circular base 2. The outer wall of the terminal 1 is provided with a fixed shoulder 11, which is inserted into the sink 21. Then, the circular base 2 inserted into the sink 21 is positioned by a graphite jig and placed together in a vacuum welding container. After the welding container is evacuated, a protective gas is injected and high-temperature heating is performed. After welding, the middle of the terminal 1 is fixed in the circular base 2, and the upper and lower interfaces of the terminal 1 are on the upper and lower sides of the circular base 2.

[0005] However, the above-mentioned glass welding in a container has the following defects. Since the welding process is carried out in a container filled with protective gas, if the welding position of the terminal 1 and the circular base 2 deviates during the overall welding process, the staff cannot intervene, and the position of the terminal 1 and the circular base 2 that are misaligned cannot be corrected after the welding is completed. Summary of the Invention

[0006] The first purpose of the present invention is to provide a welding fixture for transmission terminals and bases, which clamps and fixes smaller terminals, bases and tin rings, and uses direct heating from an external heater to allow workers to adjust the positions of the terminals and bases during the heating and soldering process. Terminals that are misaligned can also be reworked and adjusted after direct heating, thereby improving the yield rate of welding smaller terminals and bases.

[0007] The first technical objective of the present invention is achieved through the following technical solutions:

[0008] Preferably, a welding fixture for a transmission terminal and a base includes a heat conductive block, the upper surface of the heat conductive block is a flat surface for placing the base, a socket for inserting the terminal below is provided on the upper surface of the heat conductive block, a sliding clamping claw for positioning and clamping the terminal is provided on the upper surface of the heat conductive block, and the heat conductive block is threadedly connected to a screw for pushing the clamping claw to move back and forth toward the socket; a pin for supporting the upper end of the terminal is installed on the upper end of the heat conductive block, the pin is located above the socket, and the heat conductive block is provided with an elastic member for pushing the pin downward.

[0009] Preferably, the clamping jaw is a concave structure, and the three side surfaces of the clamping jaw and the terminal are fitted together.

[0010] Preferably, a positioning slider is fixed below the clamping jaw, and the heat conducting block is provided with a linear slide groove pointing to the insertion hole, and the positioning slider slides in the linear slide groove.

[0011] Preferably, the end of the screw and the clamp are connected by a rotation barrier, the end of the screw is blocked with the clamp along its axial direction, and the end of the screw rotates around its own axis in the clamp.

[0012] Preferably, a vertical rotating shaft is fixed on the upper surface of the heat conductive block, and a rotating cylinder is provided on the rotating shaft sleeve. Two support rods are fixed laterally on the side of the rotating cylinder. The ejector pin is passed through the two support rods, and the elastic member is a spring located between the two support rods. The spring is sleeved on the ejector pin, and a stopper is fixed to the ejector pin, and the lower end of the spring abuts against the stopper.

[0013] Preferably, the heat conducting block is a copper block or an iron block.

[0014] Preferably, the distance between the upper surface and the lower surface of the heat conducting block is 1-3 cm.

[0015] The second purpose of the present invention is to provide a welding process for transmission terminals and bases, which clamps and fixes smaller terminals, bases and tin rings, and uses direct heating from an external heater to allow workers to adjust the positions of the terminals and bases during the heating and soldering process. Terminals that are misaligned can also be reworked and adjusted after direct heating, thereby improving the yield rate of welding smaller terminals and bases.

[0016] The second technical objective of the present invention is achieved through the following technical solutions:

[0017] A welding process for a transmission terminal and a base comprises the following steps:

[0018] Step 1: Place the tin ring in the base and insert the terminal into the recess of the base to complete the clamping of the tin ring by the base and the terminal;

[0019] Step 2: Place the base and terminal on the upper surface of the heat conducting block, and insert the lower end of the terminal into the socket of the heat conducting block to complete the initial positioning;

[0020] Step 3: Push the clamping claws so that they clamp the side of the positioning terminal;

[0021] Step 4: Hold the ejector pin on the upper end of the terminal to achieve final positioning;

[0022] Step 5: Place the heat conducting block with the mounting terminal and base on the heating block and heat and solder.

[0023] Step 6: Remove the heated thermal block.

[0024] Preferably, in step one, the tin bar is wound along the correction rod, the cross section of the correction rod is the same as the cross section of the jack, and then the wound tin bar is cut along the side of the correction rod to obtain a tin ring.

[0025] Preferably, in step five, the heating temperature is in the range of 240-260 degrees.

[0026] In summary, the present invention has the following beneficial effects:

[0027] (1) The welding fixture clamps and fixes smaller terminals, bases and tin rings, and uses direct heating from an external heater, allowing workers to adjust the positions of the terminals and bases during the heating and soldering process. Terminals that are misaligned can also be reworked and adjusted after direct heating, thereby improving the yield rate of welding smaller terminals and bases.

[0028] (2) The traditional method of welding glass glue in a protective gas container has a high welding temperature. The melting point of low-temperature glass solder is also 500 degrees. This design uses tin bars, and the melting point of tin bars is 200-300 degrees. Therefore, this design has lower energy consumption and is more environmentally friendly.

[0029] (3) The traditional method of welding glass glue in a protective gas container uses a graphite jig to avoid color difference in the product caused by oxidation during welding. However, graphite itself has the defects of being unstressed and easily damaged, which can easily lead to deviations in the welding position of the terminal and the base. In contrast, this design uses a metal jig made of copper or iron, which is more stable and firm for positioning the terminal and the base, and adopts the base heat conduction method, so the terminal does not need to be heated as a whole.

[0030] (4) The wettability of glass solder and silver-copper solder is relatively poor compared to tin bars, so the terminals and base of this design are more firm and stable after welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the assembly process of the terminal and base;

[0032] Figure 2 is a schematic structural diagram of the welding fixture in Example 1;

[0033] Figure 3 This is a schematic diagram of the installation of the terminal and welding fixture in Example 1;

[0034] Figure 4 is a side view of the ejector pin pressing terminal in Example 1;

[0035] Figure 5 is a cross-sectional view of the connection between the screw and the clamping jaw in Example 1;

[0036] Figure 6 is a schematic diagram of the welding fixture placed on the heating block in Example 2;

[0037] Figure 7 Schematic diagram of the tin bar wound around the correction rod in Example 2.

[0038] In the picture:

[0039] 1. Terminal; 11. Fixed shoulder; 2. Base; 21. Sink;

[0040] 3. Heat conducting block; 31. Flat surface; 32. Socket;

[0041] 4. Clamping jaws; 41. Screw;

[0042] 51. ejector pin; 52. stopper; 53. elastic member;

[0043] 61. Positioning slider; 62. Linear slide;

[0044] 71. Rotating shaft; 72. Rotating drum; 73. Support rod;

[0045] 81. Tin ring; 82. Correction rod;

[0046] 9. Heating block. DETAILED DESCRIPTION

[0047] The present invention will be further described in detail below with reference to the accompanying drawings.

[0048] Example 1, with reference to Figure 1-Figure 5 A welding fixture for a transmission terminal and a base includes a heat conducting block 3, which is a rectangular iron block with a thickness of 1.5 cm. The upper surface of the heat conducting block 3 is a flat surface 31 on which the base 2 is placed.

[0049] The upper surface of the heat conducting block 3 is provided with an insertion hole 32 for inserting the terminal 1 from below. The cross section of the insertion hole 32 is waist-shaped, and the insertion hole 32 and the terminal 1 are loosely matched.

[0050] A clamping claw 4 for positioning and clamping the terminal 1 is slidingly provided on the upper surface of the heat conducting block 3 . The clamping claw 4 is a concave structure, and the clamping claw 4 and the three side surfaces of the terminal 1 are fitted together.

[0051] A positioning slider 61 is fixed under the clamping jaw 4, and a linear slide groove 62 pointing to the socket 32 ​​is provided on the heat conducting block 3. The positioning slider 61 slides in the linear slide groove 62, so the positioning slider 61 moves back and forth along the linear slide groove 62 to drive the clamping jaw 4 to move back and forth accurately toward the socket 32.

[0052] The heat conducting block 3 is threadedly connected to a screw 41 that pushes the clamping jaw 4 to move back and forth toward the jack 32, and one end of the screw 41 is used for rotation; Figure 5 The other end of the screw 41 is connected to the clamping jaw 4 by a rotation barrier, and the other end of the screw 41 is blocked with the clamping jaw 4 along its axial direction, and the end of the screw 41 rotates around its own axis in the clamping jaw 4.

[0053] Reference Figure 4 A pin 51 for supporting the upper end of the terminal 1 is installed at the upper end of the heat conducting block 3. The pin 51 is located above the socket 32. The heat conducting block 3 is provided with an elastic member 53 for pushing the pin 51 downward. A vertical rotating shaft 71 is fixed to the upper surface of the heat conducting block 3. The rotating shaft 71 is sleeved with a rotating cylinder 72. Two support rods 73 are fixed laterally to the side of the rotating cylinder 72. The pin 51 is inserted into the two support rods 73, and the elastic member 53 is a spring located between the two support rods 73. The spring is sleeved on the pin 51. The pin 51 is fixed with a stopper 52, and the lower end of the spring abuts against the stopper 52.

[0054] Example 2, a welding process of a transmission terminal and a base, referring to Figure 1-Figure 7 , including using the welding fixture in Example 1,

[0055] The specific process includes the following steps:

[0056] In step 1, the tin bar is wound along the correction rod 82 , the cross section of the correction rod 82 is the same as the cross section of the socket 32 ​​, and then the wound tin bar is cut along the side of the correction rod 82 to obtain a tin ring 81 , which can be placed in the sink 21 of the slot base 2 .

[0057] Place the tin ring 81 in the base 2, and insert the fixed shoulder 11 of the terminal 1 into the recess 21 of the base 2 to complete the clamping of the tin ring 81 by the base 2 and the terminal 1;

[0058] Step 2: Place the base 2 and the terminal 1 on the upper surface of the heat conducting block 3, and insert the lower end of the terminal 1 into the socket 32 ​​of the heat conducting block 3 along the through hole at the sink 21 to complete the preliminary positioning;

[0059] Step 3: Rotate the screw 41 to move the clamping jaw 4 toward the terminal 1 so that the clamping jaw 4 clamps the side of the terminal 1. The clamping jaw 4 clamps the portion of the terminal 1 above the fixed shoulder 11 to reduce the probability of the terminal 1 tilting.

[0060] Step 4: Rotate the drum 72 to position the ejector pin 51 above the terminal 1. The worker releases the ejector pin 51, which is then held against the upper end of the terminal 1 by the spring to achieve final positioning.

[0061] Step 5: Place the heat conducting block 3 with the mounting terminal 1 and the base 2 on the heating block 9. The heating block 9 is an electric heating block 9 that can control the heating temperature and heating time. The heating temperature is 250 degrees.

[0062] Step 6: Remove the heated heat-conducting block 3 and remove the welded terminal 1 and base 2.

[0063] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A welding process for a transmission terminal and a base, characterized by: A welding fixture is used, the welding fixture includes a heat conducting block (3), the upper surface of the heat conducting block (3) is a flat surface (31) for placing the base (2), the upper surface of the heat conducting block (3) is provided with a socket (32) for inserting the terminal (1) below, the upper surface of the heat conducting block (3) is slidably provided with a clamping claw (4) for positioning and clamping the terminal (1), the heat conducting block (3) is threadedly connected with a screw (41) for pushing the clamping claw (4) to move back and forth toward the socket (32); a pin (51) for supporting the upper end of the terminal (1) is installed at the upper end of the heat conducting block (3), the pin (51) is located above the socket (32), and the heat conducting block (3) is provided with an elastic member (53) for pushing the pin (51) to move downward; return The method comprises the following steps: step 1, placing a tin ring (81) in the base (2), inserting the terminal (1) into the sink (21) of the base (2) to complete the clamping of the tin ring (81) by the base (2) and the terminal (1); Step 2: Place the base (2) and the terminal (1) on the upper surface of the middle heat conducting block (3), and insert the lower end of the terminal (1) into the socket (32) of the heat conducting block (3) to complete the initial positioning; Step 3: Push the clamping claw (4) so ​​that the clamping claw (4) clamps the side of the positioning terminal (1); Step 4: Hold the ejector pin (51) against the upper end of the terminal (1) to achieve final positioning; Step 5: Place the heat conducting block (3) of the mounting terminal (1) and the base (2) on the heating block (9) and heat and solder them; Step 6: Remove the heated heat conducting block (3).

2. The welding process of a transmission terminal and a base according to claim 1, characterized in that: Step 1: The tin strip is wound along the correction rod (82), the cross section of the correction rod (82) is the same as the cross section of the socket (32), and then the wound tin strip is cut along the side of the correction rod (82) to obtain a tin ring (81).

3. The welding process for a transmission terminal and a base according to claim 2, characterized in that: Step 5: The heating temperature ranges from 240 to 260 degrees.

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