PCB board mounting seat for shearing force test and shearing force test device

Abstract

The utility model provides a PCB board mounting seat for shearing force test, including flexible tool base, PCB board fixed base, PCB board fixed clamp, the first clamping groove that is equipped with with the PCB board of measuring card joint cooperation has been opened to PCB board fixed clamp, PCB board fixed clamp passes through PCB board fixed base and installs on flexible tool base, PCB board fixed clamp with PCB board fixed base is detachably connected, flexible tool base includes a plurality of independent lifting's metal pole, is used for locking a plurality of metal pole's locking nut, the through -hole that is equipped with with metal pole is passed in to support the through -hole of PCB board fixed base, the utility model discloses still provides a shearing force testing arrangement, including push -and -pull force testing machine and push sword, push sword installs on push -and -pull force testing machine, still includes above -mentioned for shearing force test's PCB board mounting seat, push sword is located in the just above of PCB board mounting seat.

Description

Technical Field

[0001] This utility model relates to the field of optical communication, and in particular to a PCB board mounting base for shear force testing. Background Technology

[0002] As a core component of data centers and communication networks, the performance and reliability of optical modules directly determine the transmission quality and stability of the entire system. With the rapid development of technologies such as 5G, cloud computing, and artificial intelligence, optical modules are evolving towards higher speeds, smaller sizes, and higher densities, which places extremely stringent requirements on the packaging technology of the internal components.

[0003] In the packaging structure of optical modules, core optical chips such as lasers (LDs) or detectors (PDs) typically need to be soldered onto tungsten copper (W-Cu) substrates, which are then fixed to the PCB board using an adhesive bonding process. Tungsten copper is widely used as a heat dissipation carrier for optical chips due to its excellent thermal expansion coefficient matching and high thermal conductivity, preventing chip failure caused by thermal stress. The strength of the adhesive interface, especially its shear strength, is one of the most critical indicators for evaluating package reliability. Insufficient adhesive strength can lead to interface failure under stresses such as thermal cycling and mechanical vibration, causing optical path misalignment, performance degradation, and even permanent device damage.

[0004] Currently, the industry commonly uses a general-purpose push-pull force testing machine with a push-blade and PCB board mounting bracket to test the shear force after bonding tungsten-copper substrates for optical modules. This traditional method has several significant drawbacks: 1. Various electronic components are mounted on the PCB board, and the height of each component varies. When the PCB board mounting bracket supports the PCB board, it avoids these components and only supports a few corners of the PCB board. This causes the PCB board to easily deform when the pusher pushes the tungsten copper carrier vertically downwards, making it difficult to ensure that the pusher force is strictly perpendicular to the bonding interface. This not only leads to huge deviations in the test results (shear force values) and poor repeatability of the test results, but also easily damages the expensive core optical chip on the tungsten copper carrier or adjacent components of the tungsten copper carrier due to stress concentration during the test, causing unnecessary economic losses.

[0005] Second, the PCB structures of optical module products of different models and manufacturers vary greatly. The existing PCB mounting structure is complex, and when shear force testing is performed on the tungsten copper carriers on different PCBs, the entire PCB mounting bracket needs to be replaced, resulting in low versatility and increased testing costs and tooling management complexity.

[0006] Third, each test requires tedious manual tool setting and PCB board positioning operations, which rely on the operator's experience and proficiency, making it difficult to achieve rapid and batch consistency testing, thus becoming a bottleneck for production line efficiency.

[0007] Therefore, it is necessary to design a new PCB board mounting bracket to overcome the above problems. Utility Model Content

[0008] The purpose of this invention is to overcome the defects of the prior art and provide a PCB board mounting base for shear force testing. This invention solves at least some of the problems in the prior art.

[0009] This utility model is implemented as follows: This utility model provides a PCB board mounting base for shear force testing, including a flexible fixture base, a PCB board fixing base, and a PCB board fixing clamp. The PCB board fixing clamp has a first slot for engaging with the PCB board to be tested. The PCB board fixing clamp is mounted on the flexible fixture base via the PCB board fixing base. The PCB board fixing clamp and the PCB board fixing base are detachably connected. The flexible fixture base includes multiple independently liftable metal rods and locking nuts for locking the multiple metal rods. The PCB board fixing base has through holes for the metal rods to pass through and support the PCB board.

[0010] Furthermore, the PCB board fixing clamp is installed on top of the PCB board fixing base.

[0011] Furthermore, the top of the PCB board fixing base is provided with a second slot for receiving the PCB board fixing clamp.

[0012] Furthermore, the PCB board fixing clamp and the PCB board fixing base are detachably connected by two pins.

[0013] Furthermore, the two pins are arranged diagonally.

[0014] Furthermore, the PCB board fixing base and the flexible tooling base are detachably connected.

[0015] Furthermore, the PCB board fixing base is installed on top of the flexible tooling base.

[0016] Furthermore, the top of the flexible tooling base is provided with a mounting boss, and each of the metal rods extends out from the mounting boss. The bottom of the PCB board fixing base is provided with a third slot that is engaged and connected with the mounting boss.

[0017] Furthermore, a protective pad is fitted onto the top of each of the metal rods.

[0018] This utility model also provides a shear force testing device, including a push-pull force testing machine and a pusher blade, wherein the pusher blade is mounted on the push-pull force testing machine, and the device also includes the aforementioned PCB board mounting base for shear force testing, wherein the pusher blade is located directly above the PCB board mounting base.

[0019] This utility model has the following beneficial effects: 1. This utility model provides a PCB board mounting base for testing the bonding shear force of tungsten copper carrier sheets in optical modules. Multiple metal rods on the flexible tooling base are arranged in an array, and the multiple metal rods support the PCB board together, avoiding the problem that local stress concentration on the PCB board causes deformation of the PCB board, making it unable to maintain a horizontal state, and thus preventing the pusher from applying a vertical pushing force to the tungsten copper carrier sheets on the PCB board.

[0020] 2. In this invention, each metal rod can be raised and lowered independently, descending a corresponding distance according to the different heights of various electronic components on the PCB board. After the PCB board is pressed against the metal rod array, the metal rod array sinks to form a recessed area that fits against the surface of the PCB board. Under the support of the metal rod array, the PCB board is subjected to uniform force and can maintain a good horizontal state, allowing the pusher to apply a vertical pushing force to the tungsten copper carrier sheet on the PCB board.

[0021] 3. In this invention, for PCBs of the same model, only one manual adjustment of the metal rod array is required. For PCBs of the same model, the PCB is snapped and fixed on the PCB fixing fixture, which is mounted on the flexible tooling base via the PCB fixing base. The position of its tungsten copper carrier is fixed. PCBs of the same model can be directly mounted on the PCB mounting base to achieve precise positioning, eliminating the need for tedious manual PCB positioning operations before each test. In addition, the pusher is located directly above the opening on the PCB, and the pusher position only needs to be adjusted during the first test, eliminating the need for tedious manual tool setting operations before each test. This invention enables rapid, batch consistency testing, improving production line efficiency.

[0022] 4. When performing shear force tests on tungsten copper carrier sheets on different PCB models, only the corresponding PCB board fixing fixture needs to be replaced so that the first slot of the PCB board fixing fixture can be engaged with the new PCB board. There is no need to replace the entire PCB board mounting base. This utility model has good versatility and reduces testing costs and tooling management complexity. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 Top view of the PCB board fixing clamp provided in an embodiment of this utility model; Figure 2 A side view of the PCB board fixing clamp provided in an embodiment of this utility model; Figure 3 A top view of the PCB board fixing base provided in an embodiment of this utility model; Figure 4 A side view of the PCB board fixing base provided in an embodiment of this utility model; Figure 5 Left view of the flexible tooling base provided in this embodiment of the utility model; Figure 6 Rear view of the flexible tooling base provided in an embodiment of this utility model; Figure 7 A bottom view of the flexible tooling base provided in an embodiment of this utility model; Figure 8 Left view of the PCB board mounting bracket assembly for shear force testing provided in an embodiment of this utility model; Figure 9 A top view of the PCB board mounting base for shear force testing provided in this embodiment of the utility model (without the PCB board installed, and the metal rod protruding from the first slot).

[0025] In the diagram: 1. Flexible tooling base; 2. PCB board fixing base; 3. PCB board fixing clamp; 4. First slot; 5. Metal rod; 6. Locking nut; 7. Through hole; 8. Second slot; 9. Pin; 10. Mounting boss. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0027] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0029] like Figures 1-9 This utility model provides a PCB board mounting base for shear force testing, including a flexible tooling base 1, a PCB board fixing base 2, and a PCB board fixing clamp 3. The PCB board fixing clamp 3 has a first slot 4 for engaging with the PCB board to be tested. The PCB board fixing clamp 3 is mounted on the flexible tooling base 1 through the PCB board fixing base 2. The PCB board fixing clamp 3 and the PCB board fixing base 2 are detachably connected. The flexible tooling base 1 includes multiple independently liftable metal rods 5 and locking nuts 6 for locking the multiple metal rods. The PCB board fixing base 2 has through holes 7 for the metal rods to pass through and support the PCB board.

[0030] like Figures 5-7 The flexible tooling base 1 has multiple metal rods 5 arranged in an array, which together support the PCB board. This avoids local stress concentration on the PCB board, which would cause the PCB board to deform and lose its horizontal state, thus preventing the pusher from applying a vertical pushing force to the tungsten copper carrier on the PCB board.

[0031] Each metal rod 5 can be raised and lowered independently, descending a corresponding distance according to the different heights of various electronic components on the PCB board. After the PCB board is pressed against the metal rod array, the metal rod array sinks down to form a recessed area that is completely in contact with the surface of the PCB board. Under the support of the metal rod array, the PCB board is subjected to uniform force and can maintain a relatively horizontal state.

[0032] The flexible tooling base 1 in this utility model is an existing device that can be purchased directly. Its structure and working principle are conventionally known and will not be described in detail here. Henggu 1200AX-806050-TS is one of the available models of the flexible tooling base 1.

[0033] A tungsten copper carrier sheet is bonded to the upper surface of a PCB board. The PCB board has pre-drilled openings in the area corresponding to the bonded tungsten copper carrier sheet for subsequent shear testing. The size of these openings is smaller than the size of the tungsten copper carrier sheet. During the shear strength test of the tungsten copper carrier sheet bonding interface, the upper surface of the PCB board is positioned downwards, meaning the tungsten copper carrier sheet faces the flexible fixture base. A pusher extends through the openings towards the tungsten copper carrier sheet, using a pushing force to separate the tungsten copper carrier sheet from the PCB board, thus obtaining the shear force value. During the shear force test, both the PCB board and the tungsten copper carrier sheet are horizontally positioned, and the pusher applies a downward pushing force to the tungsten copper carrier sheet, meaning the direction of the pusher's force is perpendicular to the tungsten copper carrier sheet.

[0034] The PCB board fixing clamp 3 is installed on the top of the PCB board fixing base 2. The PCB board fixing clamp 3 is used to fix the PCB board to be tested. The PCB board fixing clamp 3 can be replaced according to the different PCB boards to be tested, that is, the size and structure of the first slot 4 can be changed so that the first slot 4 can be fully matched and snapped into place with the new PCB board to be tested. Figure 2 This is a schematic diagram of a type of PCB board fixing fixture.

[0035] like Figures 3-4 In this embodiment, the top of the PCB board fixing base 2 is provided with a second slot 8 for receiving the PCB board fixing clamp 3. The PCB board fixing clamp and the PCB board fixing base are detachably connected by two pins 9, which are arranged diagonally.

[0036] like Figures 8-9 The PCB board fixing base 2 is installed on the top of the flexible tooling base 1. The PCB board fixing base 2 and the flexible tooling base 1 are detachably connected; specifically, the PCB board fixing base 2 and the flexible tooling base 1 are snap-fitted together. In this embodiment, as... Figures 5-7 The top of the flexible tooling base 1 is provided with a mounting boss 10, and each of the metal rods 5 extends out from the mounting boss 10. The bottom of the PCB board fixing base 2 is provided with a third slot that is snapped into and connected to the mounting boss 10.

[0037] The installation method of the above-mentioned flexible tooling base 1, PCB board fixing base 2, and PCB board fixing clamp 3 is simple and convenient, and can achieve quick clamping and replacement.

[0038] The top of each of the metal rods 5 may also be fitted with a protective pad to prevent the PCB board from being scratched when in contact with it.

[0039] In this embodiment, as Figure 6 The locking nut 6 of the flexible tooling base is located on the side wall of the flexible tooling base 1, which facilitates adjustment and locking by the operator.

[0040] Embodiment 2 of this utility model provides a shear force testing device, including a push-pull force testing machine and a pusher blade. The pusher blade is mounted on the push-pull force testing machine. The device also includes the aforementioned PCB board mounting base for shear force testing. The pusher blade is located directly above the PCB board mounting base, specifically directly above the opening on the PCB board.

[0041] When using the PCB board mounting bracket, the PCB board to be tested (at this time, the PCB board has not yet been bonded with the tungsten copper carrier sheet) is first installed into the first slot 4 of the PCB board fixing fixture 3 by snap-fit. Then, the PCB board fixing fixture 3 is fixed to the PCB board fixing base 2 by two pins 9. Then, the operator installs the PCB board fixing base 2 onto the flexible fixture base 1. The metal rod array on the flexible fixture base 1 passes through the through hole 7 on the PCB board fixing base 2 and contacts the PCB board. According to the different heights of various electronic components on the PCB board, it descends a corresponding distance. Because the pusher needs to apply a vertical downward force to the tungsten copper carrier sheet to separate the tungsten copper carrier sheet from the PCB board, a clearance area needs to be set below the tungsten copper carrier sheet to facilitate the tungsten copper carrier sheet falling down. Therefore, after the metal rod array has sunk to obtain a recessed area that is completely in contact with the surface of the PCB board, it is still necessary to pass through the PCB board... The opening is made, and the metal rods corresponding to the tungsten copper carrier sheet are manually pressed down to create a clearance area. Then, the locking nuts 6 on the side wall of the flexible fixture base are manually rotated and tightened to fix the position of each metal rod 5, preventing axial displacement. After completing the above preparations, the array of metal rods on the flexible fixture base 1 forms a recessed area that is completely in contact with the PCB board surface, and a clearance area is provided at the position corresponding to the tungsten copper carrier sheet. At this time, the PCB board that has not yet been bonded with the tungsten copper carrier sheet can be removed and replaced with a PCB board (of the same model as the previous PCB board) that has been bonded with the tungsten copper carrier sheet. Then, the shear force test of the tungsten copper carrier sheet can be carried out. During the shear force test, the pusher is installed on the push-pull force testing machine and moves vertically downward. After passing through the opening on the PCB board, it contacts the tungsten copper carrier sheet and continues to apply a vertically downward force to the tungsten copper carrier sheet until the tungsten copper carrier sheet separates from the PCB board. For PCBs of the same model, only one manual adjustment of the metal rod array is required. The PCBs are snapped and fixed onto the PCB fixing fixture 3, which is mounted on the flexible tooling base 1 via the PCB fixing base 2. The position of the tungsten copper carrier is fixed. PCBs of the same model can be directly mounted onto the PCB mounting base for precise positioning, eliminating the need for tedious manual PCB positioning before each test. Furthermore, the pusher is located directly above the opening on the PCB, and its position only needs to be adjusted during the first test, eliminating the need for tedious manual tool setting before each test. This invention enables rapid, batch-scale consistency testing, improving production line efficiency.

[0042] In addition, when performing shear force tests on tungsten copper carrier sheets on different PCB models, only the corresponding PCB board fixing fixture needs to be replaced so that the first slot of the PCB board fixing fixture can be engaged with the new PCB model. There is no need to replace the entire PCB board mounting base. This utility model has good versatility and reduces testing costs and tooling management complexity.

[0043] The PCB board mounting base provided by this utility model can achieve precise positioning of the PCB board, and has the advantages of high repeatability, high precision and high efficiency while protecting the safety of the PCB board.

[0044] This utility model designs a modular and replaceable PCB board fixing fixture, enabling one set of tooling to be compatible with a variety of different PCB board models. This significantly reduces the cost of designing, manufacturing, and maintaining dedicated PCB board mounting bases for each PCB board model, achieving multi-purpose functionality with a single fixture.

[0045] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A PCB board mounting base for shear force testing, characterized in that: The device includes a flexible fixture base, a PCB board fixing base, and a PCB board fixing clamp. The PCB board fixing clamp has a first slot that engages with the PCB board to be tested. The PCB board fixing clamp is mounted on the flexible fixture base via the PCB board fixing base. The PCB board fixing clamp and the PCB board fixing base are detachably connected. The flexible fixture base includes multiple independently liftable metal rods and locking nuts for locking the multiple metal rods. The PCB board fixing base has through holes for the metal rods to pass through and support the PCB board.

2. The PCB board mounting bracket for shear force testing as described in claim 1, characterized in that: The PCB board fixing clamp is installed on top of the PCB board fixing base.

3. The PCB board mounting bracket for shear force testing as described in claim 2, characterized in that: The top of the PCB board fixing base is provided with a second slot for receiving the PCB board fixing clamp.

4. The PCB board mounting bracket for shear force testing as described in claim 3, characterized in that: The PCB board fixing clamp and the PCB board fixing base are detachably connected by two pins.

5. The PCB board mounting bracket for shear force testing as described in claim 4, characterized in that: The two pins are arranged diagonally.

6. The PCB board mounting bracket for shear force testing as described in claim 1, characterized in that: The PCB board fixing base and the flexible tooling base are detachably connected.

7. The PCB board mounting bracket for shear force testing as described in claim 1, characterized in that: The PCB board fixing base is installed on top of the flexible tooling base.

8. The PCB board mounting bracket for shear force testing as described in claim 7, characterized in that: The top of the flexible tooling base is provided with a mounting boss, and each of the metal rods extends out from the mounting boss. The bottom of the PCB board fixing base is provided with a third slot that is engaged and connected with the mounting boss.

9. The PCB board mounting bracket for shear force testing as described in claim 1, characterized in that: Each of the metal rods is fitted with a protective pad at its top.

10. A shear force testing device, comprising a push-pull force testing machine and a pusher blade, wherein the pusher blade is mounted on the push-pull force testing machine, characterized in that: It also includes a PCB mounting base for shear force testing as described in any one of claims 1-9, wherein the pusher is located directly above the PCB mounting base.

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