Parallel seam welding electrode

Abstract

According to the parallel seam welding electrode disclosed by the invention, a roller is fixed at the bottom of a vertical section, and a locking hole is formed in a horizontal section, so that the adaptive breakthrough of a lead upward packaging structure is realized. The right-angle design of the vertical section and the horizontal section enables the working position of the roller to deviate in the vertical direction relative to a traditional plane electrode, a shell lead protruding area can be accurately avoided, and effective contact between the roller and the welding face of a cover plate is ensured. Therefore, the core problem that a traditional parallel seam welding electrode cannot complete airtight packaging due to the interference of the height of an outer lead is solved. The integral rigidity of the electrode structure is enhanced through the integral forming process, the deformation risk is reduced under the working conditions of welding pressure and high-speed rotation, and the stability of a welding path is guaranteed; meanwhile, due to the modular interface design of the horizontal section locking hole and the equipment clamp, the electrode installation precision and maintainability are improved, and a reliable technology implementation path is provided for a complex packaging scene.

Description

Technical Field

[0001] The present invention belongs to the technical field of circuit and hybrid integrated circuit manufacturing, and specifically relates to a parallel seam welding electrode. Background Art

[0002] In the aerospace field, the operating environment faced by products is extremely complex and harsh, and the reliability requirements for products have reached an almost demanding level. Spacecraft in space have to withstand numerous adverse factors such as cosmic radiation, extreme temperature changes, and micrometeorite impacts. Any minor fault may lead to mission failure and even endanger the safety of the spacecraft. Against this background, the bare chip in aerospace products, as a core functional component, the stable performance of its performance is crucial. However, the bare chip itself is very fragile and cannot directly work properly in the harsh aerospace environment. It must go through a carefully designed packaging process to protect it properly in order to ensure its stable functioning.

[0003] The airtightness after circuit packaging is one of the key indicators to measure the packaging quality, which is directly related to the service life of the circuit. In the aerospace environment, once there is an airtightness problem in the circuit packaging, external water vapor, oxygen, harmful gases, etc. will invade the inside of the packaging and react chemically with the circuit components, resulting in faults such as component corrosion, short circuit, and performance degradation, which will seriously affect the normal operation of the spacecraft. Therefore, in order to ensure the reliability and service life of the spacecraft, airtight packaging has become the mainstream solution in the aerospace field.

[0004] Among many airtight packaging solutions, the parallel seam welding process stands out with its unique advantages and has gradually become the mainstream process in the industry. This process has the characteristics of high efficiency, capable of completing a large number of packaging tasks in a short time to meet the needs of large-scale production of aerospace products; high reliability ensures that the packaged products can work stably for a long time to meet the long-term requirements of aerospace missions; the reworkability provides flexibility in the production process. When there are packaging defects, they can be repaired by rework, reducing production costs and risks.

[0005] However, in actual applications, when the shell structure has the leads facing upwards, the parallel seam welding process faces severe challenges. Since the external leads are much higher than the surface of the cover plate, the traditional parallel seam welding electrode structure cannot effectively contact the shell during the welding process, resulting in the inability to seal the shell. This problem has restricted the application of the parallel seam welding process under this specific shell structure.

[0006] Meanwhile, although the remaining sealing processes can be used for encapsulation to a certain extent, there are many deficiencies compared with the parallel seam welding process. For example, the sealing effect of some sealing processes is not good and cannot meet the high requirements of aerospace products for airtightness; the production efficiency of some processes is low and it is difficult to meet the needs of rapid delivery of aerospace products; and the reliability of some processes is poor and faults are likely to occur during long-term use. These deficiencies make it impossible for the remaining sealing processes to perfectly replace the application of the parallel seam welding process in the lead-upward housing structure. Summary of the Invention

[0007] The present invention provides a parallel seam welding electrode, which solves the problem that the traditional parallel seam welding electrode structure cannot achieve the sealing of the housing.

[0008] To achieve the above object, the present invention provides the following technical solutions: A parallel seam welding electrode includes an electrode shaft. The electrode shaft includes a vertical section electrode and a horizontal section electrode, which are integrally formed. A roller is fixed to the bottom of one side of the vertical section electrode away from the connection of the two electrodes, and a locking hole is provided on the side wall of the horizontal section electrode.

[0009] Preferably, the roller is fixed to the vertical section electrode through a roller fixing position.

[0010] Preferably, the roller fixing position is a cylindrical structure penetrating the horizontal section electrode of the electrode shaft, and the center of the cylinder is hollow.

[0011] Preferably, the included angle between the rectangular electrodes of the vertical section and the horizontal section is 90°.

[0012] Preferably, the length L of the vertical section electrode of the electrode shaft satisfies: L = H + h + Δ, where H is the height of the housing lead protrusion, h is the working thickness of the roller, and Δ is the safety gap.

[0013] Preferably, the safety gap is 0.2 - 0.5 mm.

[0014] Preferably, the working surface of the roller has a double-cone structure.

[0015] Preferably, the diameter of the roller matches the size of the housing cover to be encapsulated, and the width of the working surface of the roller is 0.5 - 1.5 mm.

[0016] Preferably, the electrode shaft is integrally formed of tungsten copper alloy or chromium copper alloy.

[0017] Preferably, the roller and the electrode shaft are detachably connected, and different sizes of rollers are replaced to adapt to the encapsulation requirements.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a parallel seam welding electrode, with rollers fixed at the bottom of the vertical section and locking holes provided in the horizontal section, achieving a breakthrough in adaptability to the upwardly leaded packaging structure. The right-angle design of the vertical section and the horizontal section causes the working position of the rollers to deviate in the vertical direction relative to the traditional planar electrode, enabling precise avoidance of the raised area of the outer shell leads and ensuring effective contact between the rollers and the welding surface of the cover plate, thereby solving the core problem that the traditional parallel seam welding electrode cannot complete airtight packaging due to the interference of the outer lead height. The one-piece forming process enhances the overall rigidity of the electrode structure, reduces the risk of deformation under welding pressure and high-speed rotation conditions, and ensures the stability of the welding path; at the same time, the modular interface design of the locking holes in the horizontal section and the equipment fixture improves the electrode installation accuracy and maintainability, providing a reliable technical implementation path for complex packaging scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the design scheme of a parallel seam welding electrode of the present invention; Figure 2 It is a schematic diagram of the roller fixation of a parallel seam welding electrode of the present invention; In the figure, 1 - electrode shaft, 2 - roller, 3 - roller fixation position, 4 - locking hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the present invention claimed, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0022] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0023] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected", "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements.

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the drawings.

[0025] As Figure 1 and Figure 2 shown, the present invention provides a parallel seam welding electrode, including an electrode shaft 1. The electrode shaft 1 includes a vertical section electrode and a horizontal section electrode, and the vertical section electrode and the horizontal section electrode are integrally formed. A roller 2 is fixed at the bottom of one side of the vertical section electrode away from the connection of the two electrodes. A locking hole 4 is provided on the side wall of the horizontal section electrode; The roller 2 is fixed on the vertical section electrode through a roller fixing position 3. The roller fixing position 3 is a cylindrical structure penetrating the horizontal section electrode of the electrode shaft. The center of the cylinder is hollow. The included angle between the rectangular electrodes of the vertical section and the horizontal section is 90°. The length L of the vertical section electrode of the electrode shaft 1 satisfies: L = H + h + Δ, where H is the height of the outer shell lead protrusion, h is the working thickness of the roller, and Δ is the safety gap. The safety gap is 0.2 - 0.5 mm. The working surface of the roller 2 is of a double-cone structure. The diameter of the roller 2 matches the size of the cover plate of the housing to be encapsulated. The width of the working surface of the roller is 0.5 - 1.5 mm. The electrode shaft 1 is integrally formed of tungsten copper alloy or chromium copper alloy. The roller 2 and the electrode shaft 1 are detachably connected, and different sizes of rollers can be replaced to adapt to the encapsulation requirements.

[0026] Design the mechanical locking holes of the electrode shaft according to the size and structure of the fixed position of the device; the vertical length of the electrode shaft should be calculated based on the distance that the circuit lead is higher than the surface of the cover plate; the size of the roller fixing position of the electrode shaft should be designed according to the distance between the circuit lead and the cover plate and the size of the cover plate; the roller size should be designed according to the roller fixing position size of the electrode shaft and the circuit size; after the drawing design is completed, it is processed and manufactured using tungsten copper, chromium copper or other copper alloys.

[0027] An embodiment of the present invention provides a parallel seam welding electrode, including: The electrode shaft 1 is integrally formed by precision forging of chromium copper alloy, and the overall structure is a right-angled L shape. The cross-sections of the vertical section and the horizontal section are 12mm×8mm rectangular parallelepipeds, and an accurate 90° angle is formed between the two. The bottom of the vertical section is fixed with a detachable roller 2 through an M3 threaded hole. The working surface of the roller is designed as a double-cone surface structure, with a diameter of 18mm, a working surface width of 1.2mm, and a cone surface inclination angle of 15°. Its size matches the 0.8mm welding strip at the edge of the cover plate of the QFP-64 housing to be encapsulated. The roller fixing position 3 adopts a cylindrical hollow structure penetrating the horizontal section, with an inner diameter of 6mm and a wall thickness of 1.5mm, and the axial positioning accuracy of the roller is ensured through interference fit.

[0028] For the lead-up packaging housing with a lead protrusion height H = 1.0mm, the length L of the vertical section of the electrode shaft is calculated according to the formula as L = 1.0mmH + 2.5mm roller working thickness h + 0.3mm safety gap Δ = 3.8mm. The locking hole 4 with a Φ4H7 tolerance grade is machined on the side wall of the horizontal section, and forms a clearance fit with the positioning pin of the quick-change fixture of the welding equipment. During installation, a pre-tightening force of 5N·m is applied through a torque wrench to complete the fixation.

[0029] During operation, the horizontal section of the electrode shaft is rigidly connected to the equipment transmission mechanism through the locking hole. The roller at the bottom of the vertical section moves circumferentially along the cover plate at a speed of 400rpm under the drive of the servo motor, and a vertical pressure of 35N is applied to form continuous overlapping solder joints between the double-cone surface roller and the welding surface of the cover plate. When it is necessary to switch to DIP-40 packaging, only the current roller needs to be disassembled and replaced with a suitable roller with a diameter of 15mm and a working surface width of 0.8mm, and the whole process can be completed within 5 minutes without stopping the equipment. After being tested by a helium mass spectrometer leak detector, the leakage rate of the packages welded by this electrode stably reaches 5×10 -10 Pa·m 3 / s, and the weld width tolerance is controlled within ±0.05mm, meeting the airtightness requirements.

[0030] Although the embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above specific embodiments and application fields. The above specific embodiments are merely illustrative and guiding, rather than restrictive. Under the inspiration of the specification, those of ordinary skill in the art can also make many forms without departing from the scope protected by the claims of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A parallel seam welding electrode, characterized in that, It includes an electrode shaft (1), and the electrode shaft (1) includes a vertical section electrode and a horizontal section electrode, which are integrally formed. A roller (2) is fixed to the bottom of one side of the vertical section electrode away from the connection of the two electrodes, and a locking hole (4) is provided on the side wall of the horizontal section electrode.

2. The parallel seam welding electrode according to claim 1, characterized in that, The roller (2) is fixed to the vertical section electrode through a roller fixing position (3).

3. The parallel seam welding electrode according to claim 1, wherein The roller fixing position (3) is a cylindrical structure passing through the horizontal section electrode of the electrode shaft, and the center of the cylinder is hollow.

4. A parallel seam welding electrode according to claim 1, characterized in that, The included angle between the rectangular electrode of the vertical section and the horizontal section is 90°.

5. The parallel seam welding electrode according to claim 1, characterized in that, The length L of the vertical section electrode of the electrode shaft (1) satisfies: L = H + h + Δ, where H is the height of the outer shell lead protrusion, h is the working thickness of the roller, and Δ is the safety gap.

6. A parallel seam welding electrode according to claim 5, characterized in that, The safety gap is 0.2 - 0.5 mm.

7. A parallel seam welding electrode according to claim 1, characterized in that, The working surface of the roller (2) has a double conical surface structure.

8. A parallel seam welding electrode according to claim 7, characterized in that, The diameter of the roller (2) matches the size of the cover plate of the outer shell to be encapsulated, and the width of the working surface of the roller is 0.5 - 1.5 mm.

9. The parallel seam welding electrode according to claim 1, characterized in that, The electrode shaft (1) is integrally formed of tungsten copper alloy or chromium copper alloy.

10. A parallel seam welding electrode according to claim 1, characterized in that, The roller (2) and the electrode shaft (1) are detachably connected, and different sizes of rollers can be replaced to adapt to the encapsulation requirements.

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