A shell tool clamp for parallel seam welding

Abstract

This invention discloses a tube housing fixture for parallel seam welding, applicable to tube housings with a housing body and lead frame. It includes a base with a set of receiving grooves. Each receiving groove contains a positioning block and a support block. The positioning block positions opposite sides of the tube housing body, and the support block supports the bottom surface of the tube housing body, suspending the leads at those points. A magnetically detachable pressure plate is provided within each receiving groove, with limiting holes to avoid obstructing the tube housing body. When the tube housing is placed in the receiving groove and positioned by the positioning blocks and supported by the support blocks, the pressure plate is magnetically pressed against the lead frame, fixing the tube housing in place. This invention achieves precise positioning of the tube housing along the lead length direction, combined with positioning along the direction perpendicular to the lead length by the pressure plate, resulting in a 360-degree positioning connection for the tube housing. This avoids the possibility of slight displacement of the tube housing in the welding direction, improving the quality of parallel seam welding packaging.

Description

Technical Field

[0001] This invention relates to the field of semiconductor packaging technology, and more specifically to a tube housing tooling fixture for parallel seam welding. Background Technology

[0002] With the rapid development of technology, electronic products are increasingly widely used in many industries, all moving towards higher reliability, smaller size, and higher integration. This is also true in high-end fields, such as military, aviation, aerospace, and automotive electronics, where stringent requirements for reliability, miniaturization, and low cost are placed on electronic products. Traditional non-hermetic plastic encapsulation is insufficient to meet reliability requirements, making integrated ceramic Kovar and integrated metal encapsulation a preferred choice. Their excellent hermeticity ensures product reliability, and their relatively compact design and lower manufacturing cost meet the requirements of most high-reliability devices. The final step in the packaging process for this type of product is capping; achieving a high-quality, efficient hermetic cap is crucial for ensuring product reliability.

[0003] Parallel seam welding sealing process is used to achieve hermetically tight welding between the cover plate and the shell. It is a hermetically tight packaging technology with low thermal stress, small temperature rise, high hermetically tightness and high reliability. It can realize the packaging of various rectangular and circular products with a certain size range of more than 1mm, and has low cost. It is widely used in the fields of ceramic Kovar integrated shell and metal integrated packaging shell.

[0004] Parallel seam welding operates on the principle of resistance welding. Heat is generated through the contact resistance between the welding electrode and the cover plate, which is conducted to the contact surface between the cover plate and the frame, melting the plating and forming a metallurgical bond. A series of overlapping weld points create a tight, hermetically sealed seam, achieving a highly reliable hermetically sealed cap. However, current parallel seam welding capping equipment primarily uses manual, single-product capping, resulting in high labor intensity, long working hours, and insufficient production capacity to meet the increasingly strong market demand. This has become a bottleneck process restricting the large-scale application of this type of packaging product. To improve efficiency and rapidly increase production capacity, array parallel seam welding packaging has become an inevitable choice.

[0005] However, many factors affect the quality of parallel seam welding, such as fixture design, cover plate quality, matching between the cover plate and base, the cover plate and the casing, electrode condition, and the matching of various process parameters for parallel seam welding. The influence of each process parameter change on the heat generated during parallel seam welding, as well as the coordination between these parameters, are crucial to achieving the best parallel seam welding encapsulation results. Especially for small-sized circuits, proper circuit fixation is a primary condition for good parallel seam welding results. Currently, the ceramic / metal casings requiring parallel seam welding are approximately 2.0 mm in size. Given their small size and light weight, ensuring that the devices do not shift during the packaging process is an increasingly challenging problem in conventional production.

[0006] Based on the above problems, in order to improve the efficiency of parallel seam welding and avoid product movement during the sealing of small-sized tubes and shells, which would lead to unqualified packaging, designing a parallel seam welding fixture has become an urgent problem to be solved. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention provides a pipe shell tooling fixture for parallel seam welding.

[0008] The present invention adopts the following technical solution:

[0009] A pipe shell tooling fixture for parallel seam welding is applied to a pipe shell with a pipe shell body and a lead frame. It includes a base with a set of receiving grooves. The fixture is characterized in that each receiving groove is provided with a positioning block and a support block. The positioning block is used to position the opposite sides of the pipe shell body, and the support block is used to support the bottom surface of the pipe shell body so that the lead is suspended at that point. A magnetically detachable pressure plate is provided in the receiving groove, and the pressure plate is provided with a limiting hole to avoid the pipe shell body. When the pipe shell is placed in the receiving groove and positioned by the positioning block and supported by the support block, the pressure plate is pressed onto the lead frame by magnetic attraction to fix the pipe shell.

[0010] Furthermore, the two opposite sidewalls of the limiting hole form a limiting fit with the other two opposite sides of the tube shell body.

[0011] Furthermore, the positioning blocks are respectively disposed on both sides of the pin length direction of the pin frame, and the positioning blocks are provided with clearance grooves to avoid the pins.

[0012] Furthermore, the dimension of the limiting hole along the pin length direction is larger than the dimension of the effective pin.

[0013] Furthermore, one side of the receiving groove is also provided with a connecting notch groove.

[0014] Furthermore, the pressure plate is made of ferromagnetic material, and the bottom of the receiving groove is provided with a magnet mounting hole, and a magnet is provided in the magnet mounting hole.

[0015] Furthermore, the pressure plate is made of magnetic material; the base is made of ferromagnetic material.

[0016] Furthermore, the base is provided with a set of mounting holes for positioning the tooling fixture.

[0017] Compared with existing technologies, the present invention has the following advantages:

[0018] 1. This solution achieves precise positioning of the housing along the pin length direction, and in conjunction with the pressure plate, precise positioning along the direction perpendicular to the pin length direction, thus forming a 360-degree positioning connection for the housing. This avoids the possibility of slight displacement of the housing in the welding direction and improves the quality of parallel seam welding packaging.

[0019] 2. The support block is used to support the bottom surface of the tube shell body so that the pin at that point is suspended, preventing the pin from being pressed down and contacting the bottom of the receiving groove, thus avoiding pin scratches and affecting product quality. In addition, the dimension of the limiting hole along the pin length direction is larger than the dimension of the effective pin. The magnetic attraction of the pressure plate can prevent the pin from being pressed within the effective length, thus also avoiding pin scratches. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of an embodiment of a pipe shell tooling fixture for parallel seam welding according to the present invention;

[0021] Figure 2 yes Figure 1 A partial structural diagram along direction A.

[0022] Explanation of reference numerals in the attached drawings: 1. Base; 2. Receiving groove; 3. Positioning block; 4. Support block; 5. Pressure plate; 6. Limiting hole; 7. Magnet mounting hole; 8. Magnet; 9. Clearance groove; 10. Notch groove; 11. Mounting hole; 100. Tube shell; 101. Tube shell body; 102. Pin frame. Detailed Implementation

[0023] To make the present invention clearer, the following description, in conjunction with the accompanying drawings, further illustrates a pipe shell tooling fixture for parallel seam welding according to the present invention. The specific embodiments described herein are for illustrative purposes only and are not intended to limit the present invention.

[0024] like Figure 1 , Figure 2 As shown, a tube housing fixture for parallel seam welding is applied to a tube housing 100 with a tube housing body 101 and a lead frame 102. The tube housing 100 is a flat package structure (i.e., FP / CSOP package), and the tube housing body 101 is a rectangular ceramic or metal body. The fixture includes a rectangular base 1 with a set of mounting holes 11 for mounting and positioning on a parallel seam welding machine. The mounting holes 11 are arranged in a cross shape around the base 1, with one pair of adjacent mounting holes being elliptical holes and the other pair being circular holes to facilitate the placement and removal of the fixture. In addition, the mounting holes 11 can be configured as through holes or blind holes as required.

[0025] A set of accommodating grooves 2 are equidistantly arranged on the upper surface of the base 1. The groove size of the accommodating groove 2 is larger than that of the tube shell 100, so that the tube shell 100 will not contact the groove wall when placed in the groove. Each accommodating groove 2 is provided with a pair of positioning blocks 3 and a set of support blocks 4. The positioning blocks 3 are respectively located on both sides of the pin frame 102 along the pin length direction, forming precise positioning with the opposite sides of the tube shell body 101. The positioning blocks 3 are provided with clearance grooves 9 to avoid pins. The support blocks 4 are used to support the tube shell body 101, and the gaps between the support blocks 4 are used to avoid pins welded to the bottom of the tube shell body 101, preventing interference. Simultaneously, the height of the support blocks 4 is greater than the thickness of the pins, so that the pins in this area are suspended, preventing scratches or damage to the pins from the bottom of the accommodating groove 2. Here, the gaps between the support blocks 4 and the clearance grooves 9 also have a certain limiting effect on the vertical direction of the pins in the plane of the tube shell 100.

[0026] For ease of processing, the support block 4 and the positioning block 3 are connected as a whole and are formed by integral milling.

[0027] A pair of magnet mounting holes 7 are provided at the bottom of the receiving groove 2, and the magnet mounting holes 7 are located in the pin length direction. Each mounting hole contains a magnet 8, which can be a permanent magnet or a controlled electromagnet. The tooling fixture also includes pressure plates 5 corresponding to the number of receiving grooves 2. The pressure plates 5 are made of ferromagnetic material, such as iron sheets, and have a rectangular limiting hole 6 in the center. The length direction of the limiting hole 6 is consistent with the pin length direction, and the two side walls in the width direction form a further limiting fit with the other two opposite sides of the tube shell body 101, so that the tube shell 100 is positioned more accurately. The pressure plates 5 press the pin frame 102 by magnetic attraction. The upper surface of the pressure plates 5 is lower than the upper surface of the tube shell body 101 to prevent the welding wheel from touching the fixture and causing arcing during the welding process. By magnetic attraction, the pressure plates 5 press the pin frame 102, so that the tube shell 100 is limited and fixed in all four directions and in the vertical direction.

[0028] In order to prevent the pins from being scratched when the pressure plate 5 clamps the pin frame 102, the length of the limiting hole 6 is set outside the effective pin length to avoid pressing on the effective pin. The pressure plate 5 is pressed on the connecting rib of the pin, that is, the edge of the pin frame 102. This area is cut off in subsequent processes. At the same time, the position of the magnet mounting hole 7 also corresponds to this area to ensure that the pressure plate 5 forms an effective magnetic connection.

[0029] One side of the receiving groove 2 is also provided with a connected notch groove 10 to facilitate the removal of the pressure plate 5 and the welded tube shell 100.

[0030] Alternatively, the magnetic connection between the pressure plate 5 and the base 1 can be achieved using another structure: the pressure plate 5 is made of a magnetic material, such as a permanent magnet; the magnet 8 is removed from the base 1, and it is made of a ferromagnetic material, such as an iron plate.

[0031] The process of using this device:

[0032] First, fix the base 1 on the worktable of the parallel seam welding machine, place the flat package 100 to be processed in the receiving groove 2, and support the package 100 through the positioning block 3, support block 4, the gap between support blocks 4 and the clearance groove 9, and accurately position the pin length direction of the package 100 and initially limit it perpendicular to the pin length direction.

[0033] Then install the pressure plate 5, which uses magnetic attraction to press the tube shell 100 into place;

[0034] Then, the parallel sealing and soldering equipment is started. With the help of the existing cover plate loading system and optical recognition system, the parallel sealing and soldering equipment accurately positions and places the matching metal cover plates (not shown in the figure) one by one onto the tube shell body 101 of the tube shell, accurately limits the direction perpendicular to the pin length, and temporarily fixes it through the pre-soldering system.

[0035] Finally, perform double-sided sealing soldering. Once all the pin housings on both sides have been soldered, the soldering process is complete.

[0036] During use, due to the influence of welding pressure and welding speed during parallel seam welding, the casing may experience slight horizontal displacement in the welding direction. This device precisely positions the casing along the pin length direction, and, in conjunction with the pressure plate, precisely positions it perpendicular to the pin length direction and applies vertical magnetic downward pressure, thus forming a 360-degree positioning and fixing connection for the casing. This avoids the possibility of slight displacement of the casing in the welding direction and helps improve the quality of parallel seam welding packaging.

[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 pipe shell tooling fixture for parallel seam welding, applied to a pipe shell (100) having a pipe shell body (101) and a lead frame (102), comprising a base (1) having a set of receiving grooves (2) on the base (1), characterized in that: Each receiving groove (2) is provided with a positioning block (3) and a support block (4). The positioning block (3) is used to position the opposite sides of the tube shell body (101), and the support block (4) is used to support the bottom surface of the tube shell body (101) so that the pins at that point are suspended. A magnetically detachable pressure plate (5) is provided in the receiving groove (2). The pressure plate (5) is provided with a limiting hole (6) to avoid the tube shell body (101). When the tube shell (100) is placed in the receiving groove (2) and positioned by the positioning block (3) and supported by the support block (4), the pressure plate (5) is pressed onto the pin frame (102) by magnetic attraction to fix the tube shell (100). The two opposite sidewalls of the limiting hole (6) form a limiting fit with the other two opposite sides of the shell body (101); The positioning blocks (3) are respectively set on both sides of the pin length direction of the pin frame (102), and the positioning blocks (3) are provided with clearance grooves (9) to avoid the pins. The dimension of the limiting hole (6) along the pin length direction is larger than the dimension of the effective pin; The gap between the support blocks (4) is used to avoid the pins welded to the bottom of the tube shell body (101) to prevent interference. At the same time, the height of the support block (4) is greater than the thickness of the pin, so that the pins in this area are suspended and will not scratch or damage the pins with the bottom of the receiving groove (2). The gap between the support blocks (4) and the avoidance groove (9) also have a certain limiting effect on the vertical direction of the pins in the plane of the tube shell (100).

2. The pipe shell tooling fixture for parallel seam welding according to claim 1, characterized in that: The receiving groove (2) is also provided with a connected notch groove (10) on one side.

3. The pipe shell tooling fixture for parallel seam welding according to claim 2, characterized in that: The pressure plate (5) is made of ferromagnetic material, and the bottom of the receiving groove (2) is provided with a magnet mounting hole (7), and a magnet (8) is provided in the magnet mounting hole.

4. A pipe shell tooling fixture for parallel seam welding according to claim 3, characterized in that: The pressure plate (5) is made of magnetic material; the base (1) is made of ferromagnetic material.

5. A pipe shell tooling fixture for parallel seam welding according to claim 1, characterized in that: The base (1) is provided with a set of mounting holes (11) for positioning the tooling fixture.

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