Vertical three-dimensional welding tool and welding method for drift tube multi-drift-ring assembly

Abstract

The invention relates to a drift tube multi-drift-ring assembly vertical three-dimensional welding tool and a welding method, and belongs to the technical field of hybrid microcircuit manufacturing. According to the method, a positioning clamp, a multi-drift-ring positioning tool piece and a side face welding positioning piece which are used in a combined mode are mainly used, step temperature welding flux is utilized, firstly, two-way three-face frame welding is conducted through high-temperature welding flux, then the multi-drift-ring positioning tool piece is utilized, and low-temperature welding flux is used for welding all drift ring assemblies and the bottom of a frame. And finally, the two welding spots between the drift ring assemblies and the upper side face are welded through the side face welding positioning pieces, the problem of simultaneous positioning and welding of the multiple drift ring assemblies is solved, and the welding efficiency and consistency are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of hybrid microcircuit manufacturing technology, specifically to a vertical three-dimensional welding fixture and welding method for a drift tube multi-drift ring assembly. Background Technology

[0002] As some equipment gradually develops towards miniaturization and three-dimensionality, the processing technology of hybrid microcircuits is also gradually expanding towards three-dimensional processing. A certain toxic agent alarm uses an ion drift tube, involving the vertical three-dimensional welding of multiple drift ring components. Its processing requires first using tooling to weld multiple PCBs into a two-way, three-sided frame. Then, nearly 40 drift rings are individually welded into the three-sided frame, and the drift rings are manually welded into the frame. Because the welding of the drift rings and the frame is not on the same plane, and the distance and depth between different components are relatively close, conventional reflow soldering processes cannot be used. Conventional processes can only follow an inside-out sequence, using solder wire to weld the four points of the inner drift ring components with a soldering iron before welding the adjacent outer drift ring components. This results in low welding efficiency, difficulty in ensuring the verticality of the components after welding, and inconsistency in the spacing between components, leading to significant ion loss during movement between components.

[0003] A search of existing patents revealed Chinese patent "A Three-Dimensional Fixture for Welding Metal Plates" (patent number CN119426900A). This fixture includes a stable base plate with a fixed frame mounted on its top. A clamping and fixing mechanism is also included, comprising a fixed plate and movable clamping plates. The fixed plate is positioned at the upper front end of the fixed frame, and movable clamping plates are located at both the top and bottom front ends of the fixed plate. This solution, through its clamping and fixing mechanism and multi-angle adjustment mechanism, allows for adjustment of the height and angle of the metal plate during welding operations, increasing its applicability and improving welding efficiency. It avoids the limitation caused by the inability to adjust angle and height during welding. However, this structure cannot solve the problem of simultaneous positioning and welding of multiple drift ring components as described in this application. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a vertical three-dimensional welding fixture and welding method for a multi-drift ring assembly of a drift tube.

[0005] It adopts the following technical solution: A vertical three-dimensional welding fixture for a drift tube multi-drift ring assembly includes a positioning fixture, a multi-drift ring positioning fixture, and a side welding positioning fixture used in combination; wherein, the positioning fixture is used for the frame positioning of two-way three-sided PCB boards in the drift tube multi-drift ring assembly; The multi-drift ring positioning fixture is used to position multiple drift rings in the frame. It is an elongated block with a convex cross section. Multiple positioning grooves for drift tubes are provided on the left and right sides in the width direction and along the length direction. The groove openings of each side face the outside, top, and bottom of the multi-drift ring positioning fixture. There is an avoidance groove on the bottom side of the multi-drift ring positioning fixture to avoid interference with the frame. The side welding positioning component is used to position the drift tube multi-drift ring assembly to facilitate welding of the contact area between the drift ring side and the inner side of the frame.

[0006] Furthermore, the side-welded positioning component is a V-shaped block, which has a first positioning plane at an angle of 45°-75° to the horizontal plane, and a second positioning plane perpendicular to the first positioning plane.

[0007] Furthermore, the angle between the first positioning plane and the horizontal plane is 60°.

[0008] Furthermore, the positioning fixture includes a base plate, a front positioning clamp, and a rear positioning clamp. The base plate is detachably positioned and connected to a horizontal PCB board of the frame via fasteners. The front and rear ends of the base plate are respectively connected to the front and rear positioning clamps, and the front and rear positioning clamps are respectively provided with positioning slots corresponding to the vertical PCB board of the frame.

[0009] Furthermore, a vise is connected to one side of the base plate, and a clamping block is connected to its moving end. The clamping block can be located between the two sides of the frame and can move along the length of the frame.

[0010] This application also provides a vertical three-dimensional welding method for a drift tube multi-drift ring assembly, using the above-mentioned vertical three-dimensional welding fixture for a drift tube multi-drift ring assembly. It includes the following steps: S1. Use positioning fixtures to position a set of vertical PCB boards and a horizontal PCB board to form a two-way, three-sided frame, and use the first solder to weld the frame into one piece; S2. Apply a paste-like second solder to the bottom surface of the frame and the bottom welding position of the drift ring; S3. Place the multi-drift ring positioning fixture on the welded frame and fix it in place. S4. Insert the drift ring assemblies one by one into the corresponding positioning slots along the multi-drift ring positioning fixture, and insert the bottom of the drift ring into the second solder that has been dripped. S5. Place the assembled frame on the hot plate and weld the drift ring and the frame together using hot plate reflow soldering. Then remove the multi-drift ring positioning fixture. S6. Place the welded frame on the corresponding positioning surface of the side welding positioning component, and perform positioning welding on the contact area between the drift ring side and the inner side of the frame. S7. After welding is completed, use a cleaning agent to clean the components.

[0011] Furthermore, the melting point of the first solder is higher than that of the second solder.

[0012] Furthermore, the first solder is a solder wire with an alloy composition of Sn96.5Ag3.0Cu0.5; the second solder is a solder paste with an alloy composition of Sn62Pb36Ag2.

[0013] Furthermore, the hot plate reflow soldering method in step S5 includes the following steps: S51. Use two hot plates, with temperatures set to 150℃±5℃ and 220℃±5℃ respectively, and heat up to reach the set temperature. S52. Place the assembled frame on a hot plate for preheating at a temperature of 150℃±5℃ for 3 to 5 minutes. S53. Place the assembled frame on a hot plate and heat it at a temperature of 220℃±5℃ for 210s~270s.

[0014] Furthermore, in step S6, the positioning welding of the contact area between the drift ring side and the inner side of the frame includes the following steps: S61. Position one outer side of the frame in contact with the first positioning plane and the bottom surface in contact with the second positioning plane, and weld the upward-exposed drift ring side to the frame contact area. S62. Position the other outer side of the frame on the first positioning plane and the bottom surface on the second positioning plane, and weld the upward-exposed drift ring to the contact area of ​​the frame.

[0015] The advantages of this invention compared to the prior art are as follows: This invention primarily utilizes a combination of positioning fixtures, multi-drift ring positioning tooling, and side-welding positioning components, along with stepped-temperature solder. First, high-temperature solder is used to weld the two-way, three-sided frame. Then, the multi-drift ring positioning tooling is used with low-temperature solder to weld all drift ring assemblies to the bottom of the frame. Finally, the side-welding positioning components are used to weld the drift ring assemblies to two points on the upper side. This solves the problem of simultaneously positioning and welding multiple drift ring assemblies, significantly improving welding efficiency and consistency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the drift tube multi-drift ring assembly to be welded in an embodiment of the present invention; Figure 2 This is a schematic diagram of the positioning fixture in an embodiment of the present invention; Figure 3This is a schematic diagram of the multi-drift ring positioning fixture in an embodiment of the present invention; Figure 4 This is a schematic diagram of the side-welded positioning component in an embodiment of the present invention; Figure 5 This is a schematic diagram showing the position of the frame dripping the second solder in step S2 of this embodiment of the invention; Figure 6 This is a schematic diagram of the drift ring positioning fixture being positioned in the frame during step S4 of this embodiment of the invention; Figure 7 This is a schematic diagram of the frame being positioned on the side welding positioning component in step S61 of this embodiment of the invention; Figure 8 This is a schematic diagram of the frame welding position in step S6 of this embodiment of the invention.

[0017] Explanation of reference numerals in the attached drawings: 100, positioning fixture; 101, base plate; 102, front positioning clamp; 102a, positioning slot; 103, rear positioning clamp; 104, fastener; 110, bench vise; 111, clamping block; 200, multi-drift ring positioning fixture; 201, positioning groove; 202, clearance groove; 300, side-welded positioning component; 301, first positioning plane; 302, second positioning plane; 900, frame; 901, horizontal PCB board; 902, vertical PCB board; 903, drift ring. Detailed Implementation

[0018] To make the present invention clearer, the following description, in conjunction with the accompanying drawings, further illustrates a vertical three-dimensional welding fixture and welding method for a multi-drift ring assembly of a drift tube. The specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0019] like Figure 1 The drift tube multi-drift ring assembly shown in this embodiment for welding has a horizontal PCB board 901 and four vertical PCB boards 902. This group of PCB boards forms a frame 900 of two-way three-sided PCB boards, that is, two pairs of vertical PCB boards 902 form a two-way structure, and the two outer vertical sides and a bottom plane of the frame 900 form a three-sided structure. Each of the two channels of the frame 900 has a set of drift rings 903 arranged along its length direction. The above structures are welded together to form the drift tube assembly.

[0020] like Figures 2 to 4As shown, a vertical three-dimensional welding fixture for a drift tube multi-drift ring assembly includes a positioning fixture 100, a multi-drift ring positioning fixture 200, and a side welding positioning component 300 used in combination. The positioning fixture 100 is used to position the frame 900 of the two-way, three-sided PCB board in the drift tube multi-drift ring assembly; the multi-drift ring positioning fixture 200 is used to position multiple drift rings 903 within the frame 900; and the side welding positioning component 300 is used to position the drift tube multi-drift ring assembly as a whole, facilitating welding of the contact areas between the sides of the drift rings 903 and the inner surface of the frame 900.

[0021] Specifically, combined Figure 2 As shown, the positioning fixture 100 includes a base plate 101, a front positioning clamp 102, and a rear positioning clamp 103. The base plate 101 is the support component of the positioning fixture, and its surface is a horizontal PCB board positioning and fixing surface. This surface has threaded holes (not shown in the figure), which are used to press the horizontal PCB board 901 together with fasteners 104 to form a positioning. Of course, corresponding positioning pressure holes can also be provided on the horizontal PCB board 901. The front positioning clamp 102 is connected to the front end of the base plate 101, and the rear positioning clamp 103 is connected to the rear end. A set of corresponding positioning slots 102a is also provided on the opposite ends of the front and rear positioning clamps. The number and position of the positioning slots 102a correspond to the number and position of the vertical PCB boards 902 in the frame 900, and are used to engage and position them.

[0022] A vise 110 is also connected to one side of the base plate 101, and a clamping block 111 is connected to its moving end. The clamping block 111 can move along the straight line of the front and rear positioning clamps, that is, along the length of the frame 900 to be positioned. The clamping block 111 can move in the two gaps of the frame 900. In this embodiment, the clamping block 111 has an inverted U-shaped structure, and the blocks on both sides can be gapped in the two vertical PCB boards 902 for clamping of the subsequent multi-drift ring positioning fixture 200.

[0023] Combination Figure 3 As shown, the multi-drift ring positioning fixture 200 is an elongated block with a convex cross-section. Multiple positioning grooves 201 for drift tubes are provided on the left and right sides of the elongated block along its length. The groove openings of each positioning groove face the outer, upper, and lower sides of the multi-drift ring positioning fixture 200. On the lower side of the multi-drift ring positioning fixture 200, there is an avoidance groove 202 to avoid interference with the vertical PCB boards 902 at the two middle points of the frame 900.

[0024] Combination Figure 4As shown, the side-welded positioning component 300 is a V-shaped block, which has a first positioning plane 301 at an angle of 45°-75° to the horizontal plane, and a second positioning plane 302 perpendicular to the first positioning plane 301. In this embodiment, preferably, the angle between the first positioning plane 301 and the horizontal plane is 60°.

[0025] Based on the above structure, this embodiment also provides a vertical three-dimensional welding method for a multi-drift ring assembly of a drift tube, which includes the following steps: S1. Use positioning fixture 100 to position four vertical PCB boards 902 and one horizontal PCB board 901 to form a two-way, three-sided frame 900, and use the first solder to weld the frame 900 into one piece.

[0026] Specifically, it includes the following steps: S11. Using the positioning fixture 100, first use the fastener 104 to clamp and fix the horizontal PCB board 901 onto the positioning surface of the base plate 101. S12. Insert the two vertical PCB boards 902 located on the inside into the positioning slots 102a of the front and rear positioning clips to achieve positioning of the two vertical PCB boards 902 and the horizontal PCB board 901. S13. Use the first solder to weld the two vertical PCB boards 902 and the horizontal PCB board 901 into one piece; S14. Insert the two vertical PCB boards 902 located on the outside into the positioning slots 102a of the front and rear positioning clips to achieve positioning of the two vertical PCB boards 902 and the horizontal PCB board 901. S15. Using the first solder, the two vertical PCB boards 902 and the horizontal PCB board 901 are then soldered together as one unit.

[0027] S2. Using an automatic or manual solder paste dispensing device, apply a second layer of solder paste to the bottom surface of the frame 900 and the bottom welding position of the drift ring. This solder should form a certain slope (approximately 0.5mm ± 0.1mm thick) to ensure welding strength and prevent short circuits between different drift ring components. Figure 5 As shown.

[0028] S3. Place the multi-drift ring positioning fixture 200 on the welded frame 900 and limit and fix it. Here, the multi-drift ring positioning fixture 200 can be limited and fixed by using a clamping tool, such as the vise 110 with clamping block 111 mentioned above.

[0029] S4. Manually pick up a single drift ring 903 and insert it one by one into the corresponding positioning groove 201 of the multi-drift ring positioning fixture 200. The bottom of the drift ring must be inserted into the second solder being poured, from top to bottom. Figure 6As shown. The melting point of the first solder is higher than that of the second solder.

[0030] S5. Place the frame 900 after assembling the drift ring on the hot plate, and weld the drift ring and the frame 900 together by hot plate reflow soldering. Then take out the multi-drift ring positioning fixture 200.

[0031] The hot plate reflow soldering method in step S5 includes the following detailed steps: S51. Use two hot plates, with temperatures set to 150℃±5℃ and 220℃±5℃ respectively, and heat up to reach the set temperature. S52. Place the assembled frame 900 on a hot plate for preheating (temperature 150℃±5℃) for 3 to 5 minutes. S53. Place the assembled frame 900 on a hot plate and heat it (temperature 220℃±5℃) for 210s~270s.

[0032] S6. Place the welded frame 900 on the corresponding positioning surface of the side welding positioning part 300, and perform positioning welding on the contact area between the side of the drift ring 903 and the inner side of the frame 900. Solder wire welding can be used here.

[0033] Specifically, the positioning and welding of the contact area between the drift ring side and the inner surface of the frame 900mm includes the following detailed steps: S61. Position one outer surface of frame 900 in contact with the first positioning plane 301 and the bottom surface in contact with the second positioning plane 302, as follows: Figure 7 As shown, this allows the upward-facing exposed drift ring side to be welded to the contact area of ​​the frame 900. S62. Position the other outer side of the frame 900 on the first positioning plane 301 and the bottom surface on the second positioning plane 302, and weld the upward-exposed drift ring to the contact area of ​​the frame 900.

[0034] Among them, such as Figure 8 As shown, position 1 in step S61 is the welding position; position 2 in step S2 is the welding position.

[0035] S7. After welding is completed, use a cleaning agent to clean this component.

[0036] In some preferred embodiments, the first solder is solder wire with an alloy composition of Sn96.5Ag3.0Cu0.5; the second solder is solder paste with an alloy composition of Sn62Pb36Ag2.

[0037] The above embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the implementation of the present invention. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. However, obvious variations or modifications derived from the essential spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. A vertical three-dimensional welding fixture for a multi-drift ring assembly of a drift tube, characterized in that: It includes a positioning fixture (100) used in combination, a multi-drift ring positioning tooling (200) and a side welding positioning component (300); wherein, the positioning fixture (100) is used for positioning the frame (900) of the two-way three-sided PCB board in the drift tube multi-drift ring assembly; The multi-drift ring positioning fixture (200) is used to position multiple drift rings in the frame (900). It is an elongated block with a convex cross section. It has multiple positioning grooves (201) for drift tubes on the left and right sides in the width direction and along its length direction. The groove openings of each positioning groove face the outside, upper and lower sides of the multi-drift ring positioning fixture (200). The multi-drift ring positioning fixture (200) has a clearance groove (202) on the lower side to avoid interference with the frame (900). The side welding positioning element (300) is used to position the drift tube multi-drift ring assembly to facilitate welding of the contact area between the drift ring side and the inner side of the frame (900).

2. The vertical three-dimensional welding fixture for a multi-drift ring assembly of a drift tube according to claim 1, characterized in that: The side-welded positioning component (300) is a V-shaped block, which has a first positioning plane (301) at an angle of 45°-75° to the horizontal plane, and a second positioning plane (302) perpendicular to the first positioning plane (301).

3. The vertical three-dimensional welding fixture for a multi-drift ring assembly of a drift tube according to claim 2, characterized in that: The first positioning plane (301) has an angle of 60° with the horizontal plane.

4. The vertical three-dimensional welding fixture for a multi-drift ring assembly of a drift tube according to claim 1, characterized in that: The positioning fixture (100) includes a base plate (101), a front positioning clamp (102) and a rear positioning clamp (103). The base plate (101) is detachably positioned and connected to the frame (900) via fasteners. The front and rear ends of the base plate (101) are respectively connected to the front and rear positioning clamps. The front and rear positioning clamps are respectively provided with positioning slots (102a) corresponding to the vertical PCB board (902) of the frame (900).

5. The vertical three-dimensional welding fixture for a multi-drift ring assembly of a drift tube according to claim 4, characterized in that: A vise (110) is also connected to one side of the base plate (101), and a clamping block (111) is connected to its moving end. The clamping block (111) can be located in the two paths of the frame (900) and can move along the length of the frame (900).

6. A vertical three-dimensional welding method for a drift tube multi-drift ring assembly, characterized in that: Using the vertical three-dimensional welding fixture for a multi-drift ring assembly of a drift tube as described in claim 1; It includes the following steps: S1. Using a positioning fixture (100), a set of vertical PCB boards (902) and a horizontal PCB board (901) are positioned to form a two-way three-sided frame (900), and the frame (900) is welded together using the first solder. S2. Apply a paste-like second solder to the bottom surface of the frame (900) and the bottom welding position of the drift ring; S3. Place the multi-drift ring positioning fixture (200) on the welded frame (900) and fix it in place; S4. Insert the drift ring assemblies one by one into the corresponding positioning grooves (201) along the multi-drift ring positioning fixture (200), and insert the bottom of the drift ring into the second solder that has been dripped. S5. Place the assembled frame (900) on the hot plate and weld the drift ring (903) and the frame (900) together by hot plate reflow soldering. Then take out the multi-drift ring positioning fixture (200). S6. Place the welded frame (900) on the corresponding positioning surface of the side welding positioning part (300) and perform positioning welding on the contact area between the drift ring side and the inner side of the frame (900). S7. After welding is completed, use a cleaning agent to clean the components.

7. A vertical three-dimensional welding method for a multi-drift ring assembly of a drift tube according to claim 6, characterized in that: The melting point of the first solder is higher than that of the second solder.

8. A vertical three-dimensional welding method for a multi-drift ring assembly of a drift tube according to claim 7, characterized in that: The first solder is a solder wire with an alloy composition of Sn96.5Ag3.0Cu0.5; the second solder is a solder paste with an alloy composition of Sn62Pb36Ag2.

9. A vertical three-dimensional welding method for a multi-drift ring assembly of a drift tube according to claim 7, characterized in that: The hot plate reflow soldering method in step S5 includes the following steps: S51. Use two hot plates, with temperatures set to 150℃±5℃ and 220℃±5℃ respectively, and heat up to reach the set temperature. S52. Place the assembled frame on a hot plate for preheating at a temperature of 150℃±5℃ for 3 to 5 minutes. S53. Place the assembled frame on a hot plate and heat it at a temperature of 220℃±5℃ for 210s~270s.

10. A vertical three-dimensional welding method for a multi-drift ring assembly of a drift tube according to claim 6, characterized in that: In step S6, the positioning welding of the contact area between the drift ring (903) side and the inner surface of the frame (900) includes the following steps: S61. Position one outer side of the frame (900) on the first positioning plane (301) and the bottom surface on the second positioning plane (302), and weld the upward-exposed drift ring side to the contact area of ​​the frame (900). S62. Position the other outer side of the frame (900) on the first positioning plane (301) and the bottom surface on the second positioning plane (302), and weld the upward-exposed drift ring to the contact area of ​​the frame (900).

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