Assembly fixture for CQFN type small tube shell alloy solder sealing cap

Abstract

The utility model discloses an assembly fixture for CQFN small tube shell alloy solder sealing caps, which comprises a first positioning arm, a second positioning arm, a fixing column, a material platform and supporting legs, the first positioning arm and the second positioning arm are mounted on the material platform through the fixing column, the first positioning arm and the second positioning arm are movably connected with the fixing column, and the supporting legs are mounted on the material platform. A first clamping groove is formed in the first positioning arm, a second clamping groove matched with the first clamping groove is formed in the second positioning arm, an opening groove is formed in the material platform, and a positioning groove is formed in the upper end of the opening groove. The tube shell is placed in the positioning groove; according to the utility model, small shell alignment auxiliary clamping which cannot be realized by a conventional clamp can be realized, the problems of overlarge deviation, poor consistency, low assembly efficiency and the like of a tube shell and a cover plate in the assembly process are effectively solved, and the assembly efficiency of a gold-tin fusion sealing process worker and the quality problem of a product are greatly improved.

Description

Technical Field

[0001] The utility model relates to an assembly fixture for an alloy solder seal cap of a CQFN type small shell Background Art

[0002] The alloy solder seal cap (fusion seal) is an important technology for realizing cavity sealing in the field of high-reliability packaging, and plays a crucial role in high-precision fields such as aerospace. Since the gold-tin alloy solder has characteristics such as moderate brazing temperature, high strength, low viscosity, thermal fatigue resistance, no need for a flux, and corrosion resistance, the gold-tin alloy solder is mostly selected as the sealing alloy solder in applications.

[0003] The commonly used circuit assembly clamping is all completed manually. The completion process is to stack and assemble the shell, cover plate, and protection cover plate from bottom to top manually, and use a spring clip to clamp after assembly to ensure good contact between the cover plate and the shell. The conventional fusion seal process flow is: circuit assembly → circuit clamping → fusion seal → circuit unclamping; the circuit is melted in a high-temperature furnace to form good infiltration with the cover plate and the shell to complete the fusion seal. After the fusion seal, the atmosphere exchange between the inside and outside of the circuit is blocked, achieving the protection of the internal interconnection system in the cavity.

[0004] In the circuit assembly clamping, there is a CQFN type small shell, whose size is small and close to the width of the existing fusion seal clamping clip, resulting in various problems when using the existing clip; First, some shells use ceramic cover plates, and the solder ring and the cover plate are not pre-welded, greatly increasing the assembly difficulty; Second, the shell sealing ring is thin, and it is very easy to cause the problem of solder falling into the shell and forming a short circuit due to inaccurate solder placement during manual assembly; Third, the lap size is insufficient due to misalignment, resulting in product structure reliability problems; Fourth, the cover plate is unevenly stressed due to the force center not being at the center of the shell, causing problems such as cover plate warping and seal failure; Fifth, the cover plate plating is damaged due to assembly clamping friction, resulting in subsequent salt spray test failure problems, etc. In summary, affected by the existing clip and product size, such products have problems such as large processing difficulty, low efficiency, and low yield. Therefore, it is necessary to design a new type of assembly fixture to solve the problems encountered in the clamping process of the existing CQFN type small shell. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide an assembly fixture for an alloy solder seal cap of a CQFN type small shell, which can realize the alignment and auxiliary clamping of a small shell that cannot be solved by a conventional fixture, effectively solve problems such as excessive deviation, poor consistency, and low assembly efficiency between the shell and the cover plate during the assembly process, and greatly improve the assembly efficiency of the staff of the gold-tin fusion seal process and the quality of the product, and has practicability and wide use.

[0006] To solve the above problems, the utility model adopts the following technical solutions:

[0007] An assembly fixture for a CQFN type small package alloy solder sealing cap, comprising a positioning arm one, a positioning arm two, a fixing column, a material platform and a support foot. The positioning arm one and the positioning arm two are installed on the material platform through the fixing column, and the support foot is installed at the lower end of the material platform. The positioning arm one and the positioning arm two are movably connected to the fixing column. A clamping groove one is provided on the positioning arm one, and a clamping groove two matching with the clamping groove one is provided on the positioning arm two. An opening groove is provided on the material platform, and a positioning groove is provided at the upper end of the opening groove.

[0008] Preferably, there are three positioning grooves, and the positioning grooves are in the shape of a "right triangle".

[0009] With this setting, the three corners of the package can be placed in the three positioning grooves for the initial positioning of the package; at the same time, it also facilitates the subsequent clamping operation of the sealing clip.

[0010] Preferably, a moving groove is provided on the positioning arm one, one end of the positioning arm two extends into the moving groove, spring installation grooves are provided on one side of the positioning arm two and the moving groove, a spring is arranged in the spring installation groove, and the spring is connected to the positioning arm one and the positioning arm two.

[0011] With this setting, due to the action of the spring, the positioning arm one and the positioning arm two always maintain a certain tension, so that the positioning arm one and the positioning arm two can automatically reset after clamping.

[0012] Preferably, the support foot includes a screw part and an adsorption part, a threaded hole is provided at the bottom of the material platform, and the screw part is connected to the threaded hole.

[0013] With this setting, the convenience of installing the support foot is increased through the screw part, and through the action of the adsorption part, it is convenient for the installation, fixation and disassembly of the falling fixture.

[0014] Preferably, a boss is provided on the material platform, and the boss is located on one side of the positioning arm two.

[0015] With this setting, through the blocking action of the boss, the positioning of the positioning arm one and the positioning arm two is realized.

[0016] Preferably, the depth of the positioning groove is 0.7 mm.

[0017] With this setting, it is convenient for the placement of the package, so that part of the package is embedded in the positioning groove.

[0018] Preferably, the width of the opening groove is 4 mm.

[0019] With this setting, it is applicable to clips with a width not exceeding 4 mm to enter and clamp the package, etc.

[0020] Preferably, the opening length of the opening groove exceeds the center of the package placement.

[0021] This setting ensures that when the sealing clip enters the clamping position, the force-bearing position of the clamping is located at the center position of the package shell.

[0022] Preferably, the first clamping groove and the second clamping groove are in an open shape of 90°.

[0023] This setting facilitates the calibration and positioning of the cover plate and realizes the calibration of the cover plate and the package shell.

[0024] The beneficial effects of the present utility model are as follows: it is convenient to use and simple to operate. Through the design of these components, the problem that CQFN small package shells cannot use fixtures for auxiliary positioning and assembly is solved, the assembly accuracy of the package shell, solder, and cover plate is improved, and the problems such as poor appearance, air leakage, foreign objects in the cavity, and insufficient strength caused by misalignment are solved, thereby improving the product quality and processing efficiency. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art, but it does not limit the protection scope of the present utility model.

[0026] Figure 1 It is a schematic structural diagram of the present utility model;

[0027] Figure 2 It is a schematic installation diagram of the support feet of the present utility model;

[0028] Figure 3 It is a schematic position diagram of the movable groove of the present utility model;

[0029] Figure 4 It is a schematic installation diagram of the spring of the present utility model;

[0030] Figure 5 It is a schematic position diagram of the positioning groove of the present utility model.

[0031] Among them, 1. First positioning arm, 2. Second positioning arm, 3. Fixed column, 4. Material platform, 5. Support foot, 6. Threaded hole, 7. Screw part, 8. Adsorption part, 9. Fixed hole, 10. Spring, 11. Spring installation groove, 12. Boss, 13. Movable groove, 14. First clamping groove, 15. Second clamping groove, 16. Package shell, 17. Cover plate, 18. Open groove, 19. Positioning groove. Detailed Embodiment

[0032] Refer to Figures 1 to 5The assembly fixture shown is used for CQFN type small tube shell alloy solder sealing cap, including positioning arm 1, positioning arm 2, fixing column 3, material platform 4 and supporting foot 5, positioning arm 1 and positioning arm 2 are installed on material platform 4 through fixing column 3, supporting foot 5 is installed at the lower end of material platform 4, positioning arm 1 and positioning arm 2 are movably connected with fixing column 3, positioning arm 1 is provided with clamping groove 14, positioning arm 2 is provided with clamping groove 2 15 matched with clamping groove 1, material platform is provided with opening groove 18, and the upper end of opening groove 18 is provided with positioning groove 19.

[0033] Furthermore, there are three positioning grooves 19, and the positioning grooves are in a "right triangle" structure.

[0034] Furthermore, a movable groove 13 is provided on the positioning arm 1, and one end of the positioning arm 2 2 extends into the movable groove. A spring mounting groove 11 is provided on one side of the positioning arm 2 and the movable groove, and a spring 10 is arranged in the spring mounting groove, and the spring is connected to the positioning arm 1 and the positioning arm 2.

[0035] Furthermore, the supporting foot 5 includes a screw portion 7 and an adsorption portion 8, and a threaded hole 6 is provided at the bottom of the material platform, and the screw portion is connected to the threaded hole.

[0036] Furthermore, a boss 12 is provided on the material platform 4 , and the boss 12 is located on one side of the positioning arm 2 2 .

[0037] Furthermore, a fixing hole 9 is provided on the material platform, and a fixing column is installed in the fixing hole 9 .

[0038] Furthermore, the fixing column passes through the spring, and the fixing column realizes the positioning of the spring.

[0039] When the utility model is used, the tube shell is first placed in the positioning groove for positioning, and then the solder, cover plate and protective cover plate are gradually superimposed on the upper end of the tube shell, and then the positioning arm 1 and the positioning arm 2 are pinched (the positioning arm 1 and the positioning arm 2 are in an open state under the action of the spring, and are located on both sides of the open groove.), and the tube shell, solder, cover plate and protective cover plate are overlapped and accurately positioned and calibrated through the action of the clamping groove 1 and the clamping groove 2 (at this time, the positioning arm 1 and the positioning arm 2 maintain a certain clamping angle under the influence of the tube shell, or the clamping position is locked to ensure that the clamping position is at the positioning groove.), and then the positioning arm 1 and the positioning arm 2 are released, and the positioning arm 1 and the positioning arm 2 are reset under the action of the spring, leaving sufficient clamping space, and after the sealing clamp enters from the middle open groove to complete the clamping, the clamp moves the circuit as a whole upward to separate from the positioning groove and the clamp itself, and the clamping processing operation is completed.

[0040] The above are only specific implementations of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that are not conceived through creative work should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope defined in the claims.

Claims

1. An assembly fixture for CQFN type small tube shell alloy solder cap, characterized by: It includes positioning arm 1, positioning arm 2, a fixed column, a material platform and a supporting foot. The positioning arm 1 and the positioning arm 2 are installed on the material platform through the fixed column, and the supporting foot is installed at the lower end of the material platform. The positioning arm 1, the positioning arm 2 and the fixed column are movably connected. The positioning arm 1 is provided with a clamping groove 1, and the positioning arm 2 is provided with a clamping groove 2 matched with the clamping groove 1. The material platform is provided with an opening groove, and the upper end of the opening groove is provided with a positioning groove.

2. The assembly fixture for the alloy solder capping of CQFN type small tube shell according to claim 1, characterized in that: There are three positioning grooves, and the positioning grooves are in a "right triangle" structure.

3. The assembly fixture for the alloy solder capping of CQFN type small tube shell according to claim 1, characterized in that: The first positioning arm is provided with a movable groove, one end of the second positioning arm extends into the movable groove, the second positioning arm and one side of the movable groove are provided with a spring installation groove, the spring is arranged in the spring installation groove, and the spring is connected to the first positioning arm and the second positioning arm.

4. The assembly fixture for the alloy solder capping of CQFN type small tube shell according to claim 1, characterized in that: The supporting foot comprises a screw portion and an adsorption portion. A threaded hole is provided at the bottom of the material platform, and the screw portion is connected to the threaded hole.

5. The assembly fixture for alloy solder capping of CQFN type small tube shell according to claim 1, characterized in that: The material platform is provided with a boss, which is located on one side of the second positioning arm.

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