Welding pressing strip with stress adjusting characteristic

Abstract

The utility model belongs to the technical field of micro-assembly process, and particularly relates to a welding depression bar with a stress adjusting characteristic, which is used for controllable welding of an elastic body, at least one part of the elastic body is tightly pressed on a welding main body by the welding depression bar, and the warping degree of the elastic body on the welding main body is adjusted; and after the elastic body is preliminarily welded on the welding main body, at least one part of the elastic body is tightly pressed on the welding main body by the welding pressing strip. According to the utility model, the post-welding stress of the reed and the PCB can be adjusted, compared with a welding auxiliary material with a traditional structure, a maintenance scheme is provided for unqualified products after welding, and the yield of the products is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of micro-assembly process, and in particular relates to a welding pressure strip with stress adjustment characteristics. Background Art

[0002] The reed is a key component of a relay. The dynamic engagement characteristics of its different contact positions directly affect the relay's reliability and lifespan. To precisely control the stress range after soldering the reed to the PCB, existing technologies often optimize the structure by modifying the single or double cantilever beam, reed size, chamfers, contact points, and other parameters to improve reed engagement performance. However, two limitations remain:

[0003] The reed processing accuracy is limited and the flexibility error is difficult to control.

[0004] The reed is a structural component with a small overall size and complex end design. At the same time, it is mostly an ultra-thin structure with strong flexibility. The manufacturing accuracy is greatly affected by the performance of the raw materials. Therefore, it is difficult to process and measure, resulting in difficulty in ensuring the design flexibility, which affects the suction performance of the reed.

[0005] Solder wetting cannot be precisely controlled during soldering, and the amount of solder creep affects the flexural characteristics of the reed.

[0006] To ensure soldering performance in modern engineering, soldering reeds to PCBs requires solder wetting between the PCB, reed, and pressure strip. However, for reeds with tiny structures, even a small amount of solder wetting can significantly affect the deflection characteristics of the cantilevered structure. Without adjustable pressure strips, the stress on the reed cannot be adjusted either. Consequently, the deflection characteristics are completely dependent on the existing pressure strip structure. This makes the reed stress characteristics difficult to maintain if they do not meet the designed values, which can further affect the final relay characteristics.

[0007] Due to these two limitations, it's common for PCB and reed soldering to fail the pull-to-close test. Both the reed structure and the PCB soldering design are difficult to adjust or repair after component production due to the effects of solder wetting and creep, and the soldering process isn't adjustable. Consequently, parts that fail the test are scrapped, resulting in a low yield, high processing and testing costs, and poor economic efficiency. Utility Model Content

[0008] In view of this, based on the current situation of limited reed processing accuracy, and in the case that the PCB board welding design remains unchanged, in order to address the problem of low stress qualification rate after welding the reed and PCB board, the utility model provides a welding pressure strip with stress adjustment characteristics to at least partially solve the above technical problems.

[0009] The specific technical solutions of the utility model are as follows:

[0010] A welding pressure strip with stress adjustment properties, used for controllable welding of an elastomer, wherein the welding pressure strip presses at least a portion of the elastomer against a welding body, thereby adjusting the degree of warping of the elastomer on the welding body;

[0011] After the elastic body is preliminarily welded to the welding body, the welding bead presses at least a portion of the elastic body onto the welding body.

[0012] Furthermore, the welding strip is in the shape of a bendable strip.

[0013] Furthermore, a mounting hole is provided on the welding body, and the welding pressure strip is installed in the mounting hole after controllingly pressing the elastic body onto the welding body.

[0014] Furthermore, the mounting hole is arranged outside the welding point of the elastomer.

[0015] Furthermore, when the warping heights of the ends of the elastic body are inconsistent, the welding strips have preset bending directions and press the different axial positions of the elastic body to control the warping mode of the ends of the elastic body.

[0016] Furthermore, the elastic body is a conductive spring, and the welding body is a printed circuit board; the printed circuit board is provided with mounting holes at both ends of the conductive spring, and the welding pressure strip passes through the mounting holes after controllingly pressing the elastic body against the printed circuit board.

[0017] Furthermore, the mounting hole is a through hole, and the welding strip passes through the mounting hole and protrudes out of the printed circuit board away from the conductive spring, and the protruding portion is welded to the printed circuit board.

[0018] The beneficial effects of the utility model are:

[0019] The welding pressure strip structure with stress adjustment characteristics of the utility model can adjust the stress between the spring and the PCB board after welding. Compared with the use of welding auxiliary materials with traditional structures, it provides a repair solution for unqualified products after welding and improves the product yield.

[0020] The welded pressure strip structure with stress adjustment characteristics of the utility model has the characteristic of providing a maintenance solution, so that products scrapped by traditional methods can be reused, thus saving raw materials and having good economic efficiency.

[0021] The utility model discloses a welding pressure strip structure with stress adjustment characteristics. In the process of adjusting the stress between the spring and the PCB board after welding, the welding can be directly separated, adjusted and re-welded according to the test results without the need for redundant tools, processes or sections, and without the need for repeated sets. The adjustment efficiency is high, and time and labor costs are saved.

[0022] The welding pressure strip structure with stress adjustment characteristics of the utility model can be made of a variety of materials with welding properties and can be used on other welding or assembly parts with post-weld stress or deflection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 This is a schematic diagram of the basic structure of the welding pressure strip in the specific embodiment of the present utility model;

[0025] Figure 2 This is a schematic diagram of a typical welding pressure strip structure in a specific embodiment of the present invention;

[0026] Figure 3 This is another typical schematic diagram of a welding pressure strip structure in a specific embodiment of the present invention;

[0027] Figure 4 This is another typical schematic diagram of a welding pressure strip structure in a specific embodiment of the present invention;

[0028] Figure 5 Schematic diagram of three single cantilever beam welding states in a specific embodiment of the present invention;

[0029] Figure 6 Schematic diagram of three single-end double cantilever beam welding states in a specific embodiment of the present invention;

[0030] Figure 7 Schematic diagram of welding state of three multi-end double cantilever beams in a specific embodiment of the present invention;

[0031] Figure 8 Schematic diagram of the change of the deflection curve of the welding pressure strip in the specific embodiment of the present invention;

[0032] Among them: 1. Welding body; 2. Elastic body; 3. Welding strip. DETAILED DESCRIPTION

[0033] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0034] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0035] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on this disclosure, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement an apparatus and / or practice a method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this apparatus and / or practice this method.

[0036] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present disclosure. The illustrations only show components related to the present disclosure and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0037] Additionally, in the following description, specific details are provided to provide a thorough understanding of the examples. However, one skilled in the art will appreciate that the aspects described can be practiced without these specific details.

[0038] In one embodiment of the present invention, a welding pressure strip with stress adjustment characteristics is provided for controllable welding of an elastomer 2. The welding pressure strip 3 presses at least a portion of the elastomer 2 against the welding body 1, thereby adjusting the degree of warping of the elastomer 2 on the welding body 1.

[0039] After the elastic body 2 is preliminarily welded to the welding body 1 , the welding pressure strip 3 presses at least a portion of the elastic body 2 onto the welding body 1 .

[0040] In this embodiment, the welding strip 3 is in the shape of a bendable strip.

[0041] In some embodiments, a mounting hole is provided on the welding body 1 , and the welding pressure strip 3 is installed in the mounting hole after controllingly pressing the elastic body 2 onto the welding body.

[0042] In some embodiments, the mounting hole is arranged outside the welding point of the elastic body 2.

[0043] In some embodiments, when the end warping heights of the elastomer 2 are inconsistent, the welding strip 3 presets a bending direction and presses the elastomer 2 at different axial positions to control the warping mode of the end of the elastomer 2 .

[0044] In some embodiments, the elastic body 2 is a conductive spring, and the welding body 1 is a printed circuit board; the printed circuit board is provided with mounting holes at both ends of the conductive spring, and the welding strip 3 passes through the mounting holes after controlling the pressing of the elastic body 2 against the printed circuit board.

[0045] In some embodiments, the mounting hole is a through hole, and the welding strip 3 passes through the mounting hole and protrudes out of the printed circuit board away from the conductive spring, and the protruding portion is welded to the printed circuit board.

[0046] This embodiment adjusts the structure of the welding pressure strip 3 with stress adjustment characteristics to change the deflection curve of the spring cantilever beam and the area wetted by the solder, thereby adjusting the stress of the spring.

[0047] This embodiment can simultaneously use multiple welding pressure strips 3 structures with stress adjustment characteristics. The adjustment method of each welding pressure strip 3 structure with stress adjustment characteristics can be different, so as to achieve differentiated compensation effects for different ends.

[0048] refer to Figure 1 A welding pressure strip 3 structure with stress adjustment characteristics is an integrated structure, including two welding feet, two corners and a pressure strip structure.

[0049] The length of the welding leg structure is adjusted according to the thickness of the welded parts, the R angle of the corner structure is adjusted according to the specific welding standards, and the structural shape of the pressure strip structure is adjusted according to the stress requirements of the welded parts. Figure 1 Provides a basic structure. Figure 2-Figure 4Three typical schematic diagrams of welding strip 3 structures are provided, namely C-type structure, S-type structure, and M-type structure. The bending point, bending direction, and bending size in each structure can be flexibly adjusted according to the stress requirements of the welded parts.

[0050] A working mode of a welding pressure strip 3 structure with stress adjustment characteristics: during welding, the solder is accumulated along the welding structure with stress adjustment characteristics, so that the welding pressure strip 3 structure with stress adjustment characteristics is fixed to the welded part, and at the same time, compared with a basic welding pressure strip 3 structure, the solder wetting area is changed; reference Figure 8 Different types of adjustment structures allow the crimping point to move while the reed contact point and welding foot position remain unchanged, causing the reed deflection curve to change, thereby adjusting the reed stress; after welding is completed, a pull-in test is performed. If the test results do not meet expectations, the welding parts are removed and the bending point, bending direction, bending size and other parameters of the pressure strip structure are adjusted according to the test results.

[0051] refer to Figure 5 A stress-adjusting welding strip 3 can be used for single cantilever beam welding. The welding strip 3 can influence the deflection curve between the elastic body 2 and the welding body 1 by adjusting the bending point, direction, and size of the C-shaped structure. Alternatively, a single welding strip 3 can be used to adjust the bending point, direction, and size of different structural components of the strip, independently adjusting the deflection curve between different ends of the elastic body 2 and multiple contact points on a single side of the welding body 1.

[0052] refer to Figure 6 A stress-adjusting welding strip 3 can be used for single-end dual-cantilever beam welding. Multiple welding strips 3 or combinations of different structures can be used to adjust the bending point, bending direction, and bending size of different sections of the strip, and to individually adjust the deflection curves between the ends of the elastic body 2 and different contact points on the weld body 1.

[0053] refer to Figure 7 A stress-adjusting welding strip 3 can be used for welding multi-terminal dual cantilever beams. Multiple welding strips 3 or combinations of different structures can be selected to individually adjust the bending point, bending direction, and bending size of different strip components, thereby independently adjusting the deflection curves between the multiple ends of the elastic body 2 and the multiple contact points on the welding body 1.

[0054] In some embodiments, the soldering body 1 is a single PCB. In practical applications, different ends of the same spring can contact different welded parts or areas. Accordingly, the material selection and specific shape design of a stress-regulating soldering strip structure should be individually designed based on the specific application environment.

[0055] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A welding strip with stress regulating properties, characterized in that: Used for controllable welding of an elastomer, the welding pressure strip presses at least a portion of the elastomer onto the welding body, adjusting the degree of warping of the elastomer on the welding body; After the elastic body is preliminarily welded to the welding body, the welding bead presses at least a portion of the elastic body onto the welding body.

2. The welding strip with stress adjustment characteristics according to claim 1, characterized in that: The welding strip is in the shape of a bendable strip.

3. The welding strip with stress adjustment characteristics according to claim 2, characterized in that: The welding body is provided with a mounting hole, and the welding pressure strip is installed in the mounting hole after controllingly pressing the elastic body onto the welding body.

4. The welding strip with stress adjustment characteristics according to claim 3, characterized in that: The mounting hole is arranged outside the welding point of the elastic body.

5. The welding strip with stress regulating properties according to claim 4, characterized in that: When the warping heights of the ends of the elastic body are inconsistent, the welding strips are preset with bending directions to press the different axial positions of the elastic body to control the warping mode of the ends of the elastic body.

6. The welding strip with stress regulating properties according to claim 5, characterized in that: The elastic body is a conductive spring, and the welding body is a printed circuit board; mounting holes are reserved on the printed circuit board and arranged at both ends of the conductive spring, and the welding pressure strip passes through the mounting holes after controlling the elastic body to be pressed against the printed circuit board.

7. The welding strip with stress regulating properties according to claim 6, characterized in that: The mounting hole is a through hole. The welding strip passes through the mounting hole and protrudes out of the printed circuit board at a side away from the conductive spring. The protruding portion is welded to the printed circuit board.

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