Surface-mounted SMP connector reflow soldering tool

Abstract

The utility model relates to a reflow soldering tool for a surface-mounted SMP connector, belongs to the technical field of soldering tools, and solves the problems that in the prior art, the surface-mounted SMP connector is high in pre-positioning difficulty and inaccurate in pre-positioning, and the connector is prone to sliding in the soldering process, so that the soldering precision and performance are poor, and downstream TR assembly product quality is unstable. The utility model provides a reflow soldering tool for a surface-mounted SMP connector. The reflow soldering tool comprises a positioning plate and a pressing plate, the positioning plate comprises a connector positioning groove; the tool is combined with a matched use method, the pre-positioning difficulty is remarkably reduced, extremely high pre-positioning and welding accuracy can be obtained, parts are not prone to being damaged, and then the structural precision, the product stability and the comprehensive performance of downstream product TR assemblies are remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to welding tool technical field especially relates to a surface mount type SMP connector reflow soldering tool. BACKGROUND

[0002] The surface mount type SMP connector plays an important role in connecting antenna units in the TR assembly, with the continuous development of microwave / millimeter wave chip manufacturing technology and high-density system packaging technology, the number of T / R assembly transceiver channels integrated in unit area increases year by year, which promotes the development and engineering application of high-density phased array antenna microsystem. The design of multi-band, multi-polarization, low profile and high integration TR assembly requires higher precision, consistency and reliability of interconnection between different structures in the assembly process, so higher requirements are put forward for the assembly and welding process technology of the SMP connector. If the welding precision and performance of the SMP connector are insufficient, it will directly affect the structure and performance realization of the whole TR assembly.

[0003] The assembly of the SMP connector and the printed board generally adopts reflow soldering. Due to its small size and light weight, the installation precision after reflow soldering cannot meet the requirements of the prior art, and the connector after welding has problems such as offset and short circuit.

[0004] At present, the prior art generally adopts spring or rivet pressing to pre-fix the SMP connector. This fixing method still cannot avoid the sliding of the SMP connector on the one hand, and the pre-fixed position is also inaccurate on the other hand. In addition, the SMP connector will also slide during the spring or rivet pressing fixation process. In addition, this positioning method relying on large external force will also damage the connector itself and the substrate (generally a printed board). Some skilled persons in the prior art try to add a support foot on the connector and pre-drill a hole on the printed board for pre-positioning. This method may damage the circuit structure in the core area of the printed board on the one hand, and the space occupied by the support foot and the positioning hole will occupy the area of the core functional area on the other hand, which is almost unacceptable. UTILITY MODEL CONTENTS

[0005] In view of the above analysis, the utility model aims to provide a surface mount type SMP connector reflow soldering tool to solve at least one of the problems in the prior art, such as high difficulty in pre-positioning the surface mount type SMP connector, inaccurate pre-positioning, easy sliding of the connector during welding, resulting in poor welding precision and performance, unstable quality of downstream TR assembly products and the like.

[0006] The purpose of the utility model is mainly realized through the following technical solutions:

[0007] The utility model provides a kind of surface mount technology (SMT) connector reflow soldering tool, the tool includes positioning plate 1 and pressing plate 2;The positioning plate 1 includes connector positioning slot 3;The pressing plate 2 includes connector pressing block 7.

[0008] Specifically, the position of the connector positioning slot 3 corresponds to the predetermined position of the surface mount technology (SMT) connector 12 on the substrate 10, and the shape of the connector positioning slot 3 matches the shape of the surface mount technology (SMT) connector 12.

[0009] Specifically, when the connector is square or rectangular, in the assembled state, the connector positioning slot 3 should have at least one contact point with each of the four sides of the connector.

[0010] Specifically, the positioning plate 1 is also provided with a support block 4 and a positioning pin 5, the position of the support block 4 corresponds to the non-component area or force-bearing area of the substrate 10, and the height difference between the lower surface of the positioning pin 5 and the lower surface of the support block 4 is not greater than the thickness of the substrate 10.

[0011] Specifically, the substrate 10 is pre-provided with a positioning hole 11, the positioning pin 5 matches the position and size of the positioning hole 11, and the positioning plate 1 is positioned by cooperating with the positioning hole 11 of the substrate 10.

[0012] Specifically, the positioning plate 1 is also provided with a pressing plate 2 positioning slot.

[0013] Specifically, the pressing plate 2 includes a connector pressing block 7, and the position of the connector pressing block 7 corresponds to the predetermined position of the surface mount technology (SMT) connector 12 on the substrate 10.

[0014] Specifically, the connector pressing block 7 is arranged at the central position corresponding to the connector, and the contact area of the two is not less than 30% of the surface area of the connector.

[0015] Specifically, the pressing plate 2 is also provided with a positioning pressing block 8.

[0016] Specifically, the pressing plate 2 also includes an exhaust slot 9.

[0017] Compared with the prior art, the utility model can achieve at least one of the following beneficial effects:

[0018] 1. The welding tool provided by the utility model includes a positioning plate and a pressing plate, the positioning plate includes a connector positioning slot, and the pressing plate includes a connector pressing block. By pre-assembling the positioning plate and the substrate, and then assembling the surface mount technology (SMT) connector, the pre-positioning difficulty of the SMT connector is greatly reduced, and the pre-positioning accuracy is greatly improved. Moreover, the connector can be prevented from sliding in the X and Y axis directions during welding, thereby greatly improving the welding performance and welding precision.

[0019] Particularly preferably, when the positioning plate is provided with positioning pins matched with the substrate, the assembly relationship of the positioning plate and the substrate is more stable and accurate, and thus the auxiliary positioning effect is more excellent.

[0020] 2, The utility model discloses a pressing plate is used to the restriction of connector's height (Z axis) direction, on the one hand, it is helpful to further improve the positioning effect, on the other hand, effectively avoid the phenomenon that connector floats in the welding process (solder paste melts), improve the welding performance. Moreover, because the pressing plate and the positioning plate adopt 'pin positioning + self-weight pressing' mode to assemble, the pressure in the vertical direction (Z axis) mainly plays the role of limiting floating, therefore, compared with the pressing fixation in the prior art, the contact surface of the substrate and the connector and the upper surface of the connector are subjected to the force significantly reduced, and damage is not easy to produce.

[0021] 3, The pressing plate of the utility model still is equipped with exhaust groove, and the exhaust groove has the function of exhaust and avoidance, on the one hand, it can provide the exhaust passage for the gas generated in the welding process, on the other hand, it can be designed according to the specific structure of component and device to avoid other components and devices on the substrate, especially the components and devices that are easy to be damaged after being subjected to the force.

[0022] 4, The welding method specially used by the tooling provided by the utility model is used, which can significantly reduce the operation difficulty, reduce the process link, and help to improve the quality stability and comprehensive performance of the final TR assembly product, and is suitable for large-scale application and wide promotion.

[0023] In the utility model, the above-mentioned technical solutions can be combined with each other to realize more preferred combination solutions. Other features and advantages of the utility model will be described in the following content, and some advantages can become apparent from the description or by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained from the content specially pointed out in the text and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0024] The drawings are only used for the purpose of showing specific embodiments and are not considered as limiting the utility model, and the same reference signs represent the same parts throughout the drawings.

[0025] Figure 1 It is a possible welding special tooling schematic diagram;

[0026] Figure 2 It is a possible positioning plate structure schematic diagram;

[0027] Figure 3 It is a possible pressing plate structure schematic diagram;

[0028] Figure 4The schematic view of the assembly relationship between the welding special tool, the substrate and the connector.

[0029] Reference signs:

[0030] 1, positioning plate; 2, pressing plate; 3, connector positioning groove; 4, supporting block; 5, positioning pin; 6, pressing plate positioning groove; 7, connector pressing block; 8, positioning pressing block; 9, exhaust groove; 10, substrate; 11, positioning hole; 12, surface-mounted SMP connector. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present application will be described in detail below with reference to the drawings, wherein the drawings constitute a part of this application and serve to explain the principles of the present application together with the embodiments of the present application, but are not intended to limit the scope of the present application.

[0032] The present application provides a kind of surface-mounted SMP connector reflow soldering tool, the tool includes positioning plate and pressing plate;The positioning plate includes connector positioning groove;The pressing plate includes connector pressing block.

[0033] By pre-assembling positioning plate and substrate, then assembling surface-mounted SMP connector, the pre-positioning difficulty of SMP connector is greatly reduced and the pre-positioning accuracy is greatly improved;And the sliding of connector in X, Y axis direction during welding can be avoided, which greatly improves the welding performance and welding precision.

[0034] Specifically, the shape of the positioning plate matches the shape of the substrate;The size of the positioning plate can be the same as or slightly larger than the substrate to ensure that a larger area can be positioned.Exemplarily, when the edge of the connector to be welded on the substrate is very close to the edge of the substrate, a slightly larger positioning plate is preferably used, otherwise the frame size of the positioning plate may be too small to cause insufficient structural strength.

[0035] Specifically, the position of the connector positioning groove corresponds to the predetermined position of the surface-mounted SMP connector on the substrate, and the shape of the connector positioning groove matches the shape of the surface-mounted SMP connector.The function of the connector positioning groove is to pre-position the connector during assembly and limit the X, Y axis direction of the connector during welding, so the shape of the connector positioning groove is designed to define the position of the connector on the plane.Exemplarily, when the connector is triangular, in the assembled state, the connector positioning groove has at least one contact point with each side of the connector, i.e., at least three connection points;When the connector is circular, the connector positioning groove has at least three connection points with the connector, and the three connection points are distributed on the two sides of any diameter of the circular connector, otherwise the position of the circular connector may slide.

[0036] Specifically, when the connector is square or rectangular (common specifications), in the assembled state, the connector positioning groove should have at least one contact point with each of the four edges of the connector. This can ensure the limiting effect, and the longer the contact length, the better the limiting effect. In the extreme case, when the connector positioning groove completely matches the shape of the connector, the limiting effect is best.

[0037] Specifically, the positioning plate is further provided with a support block and a positioning pin. The position of the support block corresponds to the non-component area or the force-bearing area of the substrate to avoid damage to the components on the printed board due to the self-weight of the positioning plate and the pressing plate. The support block is used for structural force bearing and ensures that the positioning plate is closely attached to the substrate, while leaving an exhaust passage and a solder paste (generally refers to solder) wetting space around the components to prevent the solder paste from adhering to the tool.

[0038] Specifically, the height difference between the lower surface of the positioning pin and the lower surface of the support block is not greater than the thickness of the substrate, preferably slightly less than the thickness of the substrate, and more preferably the positioning pin is arranged on the support block, so that the positioning plate can be assembled and fastened by relying on its own weight. If the height of the positioning pin is too high or too low, it will affect the assembly effect.

[0039] Specifically, a positioning hole is pre-formed on the substrate, the positioning pin and the positioning hole are matched in position and size, and the positioning plate is positioned by cooperating with the positioning hole of the substrate through the positioning pin to ensure accurate positioning reference and prevent damage to the components caused by touching the components during assembly.

[0040] Specifically, the positioning plate is further provided with a pressing plate positioning groove. In order to ensure the accurate and fixed relative position of the positioning plate and the pressing plate, and to prevent the relative position of the pressing plate and the positioning plate from sliding during welding, the positioning plate is positioned by cooperating with the positioning pressing block arranged on the pressing plate through the pressing plate positioning groove, so as to ensure firm and accurate equipment.

[0041] Specifically, the shape of the pressing plate matches the shape of the positioning plate, and the pressing plate includes a connector pressing block, the position of which corresponds to the predetermined position of the surface-mounted SMP connector on the substrate. That is, the position of the connector pressing block also corresponds to the position of the connector positioning groove on the positioning plate. After assembly, from the perspective of top view, the substrate, the connector (the connector positioning groove is located at the edge of the connector and surrounds the connector), and the connector pressing block are arranged in sequence from bottom to top. More specifically, the connector pressing block can be square, rectangular, or have the same shape as the corresponding connector or connector positioning groove. When the connector pressing block completely matches the corresponding connector positioning groove, the connector pressing block can also function to fix the positioning plate and the pressing plate.

[0042] Specifically, the connector pressing block is arranged at the central position of the corresponding connector, and the contact area of the two is not less than 30% of the upper surface area of the connector, preferably 50-80%. More uniform stress points and larger contact area help to improve the uniformity of welding, avoid the occurrence of warping and other conditions, and thus improve the welding effect.

[0043] Specifically, the pressing plate is further provided with a positioning pressing block. The pressing plate positioning groove arranged on the positioning plate cooperates with the positioning pressing block arranged on the pressing plate to position, so as to ensure firm and accurate equipment.

[0044] Specifically, the pressing plate further comprises an exhaust groove. The exhaust groove can be used as an exhaust passage for volatile gases such as flux during welding, while reducing heat absorption of the tool structure; at the same time, the exhaust groove also plays a role of avoiding, which is used to avoid other elements on the connector or the substrate, especially the elements which are easy to be damaged after being stressed.

[0045] Further, the total thickness of the positioning plate (including the thickness of the supporting block) is greater than the thickness of the connector, and the thickness of the connector is greater than the thickness of the supporting block; since the surface-mounted SMP connector is generally rectangular or square with a thickness of 0.8-3mm, if the thickness of the supporting block is greater than the thickness of the connector, the positioning groove on the positioning plate cannot play the role of positioning and limiting; on the other hand, if the total thickness of the positioning plate is less than the thickness of the connector, the upper surface of the connector will be higher than the upper surface of the positioning plate after assembly, and the connector pressing block of the pressing plate cannot be embedded into the connector positioning groove of the positioning plate, which may cause the pressing plate to slide, thereby affecting the limiting effect and the welding effect.

[0046] Further, the sum of the thickness of the connector pressing block and the thickness of the connector is not less than the total thickness of the positioning plate (including the thickness of the supporting block), so that the connector pressing block has a small amount of allowance after assembly (the solder paste also has a certain thickness), and the connector pressing block can tightly press the connector on the substrate, thereby ensuring good limiting and welding effect.

[0047] Further, when there are different types of surface-mounted SMP connectors on the substrate, the thickness of the connector pressing block should also change, and the basic setting principle is that the assembly allowance of each connector pressing block is the same after assembly, and the entire pressing plate is basically in a horizontal state (allowing a small amount of unavoidable error).

[0048] The use method of the welding tool provided by the utility model is as follows:

[0049] S1: according to the specific structure design and preparation of the components, a welding special tool is designed, the tool comprises a positioning plate and a pressing plate; the positioning plate is provided with a connector positioning groove;

[0050] S2: coating solder paste on the substrate, and assembling the positioning plate and the substrate, the positioning plate is above the substrate;

[0051] S3: assembling the surface-mounted SMP connector to the predetermined position of the substrate through the connector positioning slot reserved in the positioning plate;

[0052] S4: assembling the pressing plate above the positioning plate, and performing vacuum reflow soldering after mold closing, and completing soldering after cooling and demolding.

[0053] The utility model discloses a design and adopt the welding special frock, and preassembling positioning plate and substrate, and then assembling surface-mounted SMP connector, so that the predetermined position of SMP connector greatly drops and the predetermined position accuracy greatly promotes, and can avoid the sliding of connector in X, Y axle direction in the welding process, greatly improves the welding performance and welding precision.

[0054] By assembling the positioning plate and the substrate first, the positional relationship of the two is fixed, then the surface-mounted SMP connector is inserted into the slot through the connector positioning slot reserved in the positioning plate, on the one hand, the difficulty of connector pre-positioning is greatly reduced, on the other hand, the pre-positioning accuracy and precision of the connector on the plane are significantly improved (i.e. the freedom degree of X, Y axis direction is limited), and the positioning plate can play an auxiliary positioning role in the whole welding process, even if the solder paste softens or becomes liquid due to heating in the welding process, the connector will not slide in X, Y axis direction.

[0055] The pressing plate is used to limit the connector in the height (Z axis) direction, which helps to further improve the positioning effect on the one hand, and effectively avoids the phenomenon of connector floating in the welding process (solder paste melting) on the other hand, and improves the welding performance. Moreover, the pressing plate and the positioning plate are assembled in the way of "pin positioning + self-weight pressing", and the pressure in the vertical direction (Z axis) mainly plays a role in limiting floating, therefore, compared with the pressing fixation in the prior art, the stress on the contact surface of the substrate and the connector and the upper surface of the connector is significantly reduced, and damage is not easy to occur.

[0056] Specifically, the shape of the connector positioning groove of the positioning plate in step S1 is designed to limit the movement of the connector in the X-axis and Y-axis directions. The positioning plate is mainly used for pre-positioning the connector and limiting the planar position of the connector during welding, so the shape of the positioning groove should achieve the above technical effects. For example, when the connector is triangular, there are at least three contact points between the connector positioning groove and each side of the connector in the assembled state, i.e., at least three connection points. When the connector is circular, there are at least three connection points between the connector positioning groove and the connector, and the three connection points are distributed on both sides of any diameter of the circular connector, otherwise the position of the circular connector will slide.

[0057] Further, when the connector is square or rectangular (common specifications), there are at least four contact points between the connector positioning groove and each side of the connector in the assembled state.

[0058] Specifically, when assembling the positioning plate and the substrate in step S3, the position calibration structures of the two are correspondingly installed.

[0059] Further, the position calibration structure is a positioning pin provided on the positioning plate and a positioning hole provided on the substrate, and the position and size of the positioning pin and the positioning hole are matched. The relative position of the positioning plate and the substrate is fixed by using the position calibration structure, which can ensure stable and accurate connection of the two, and helps to improve the accuracy of the pre-positioning of the connector.

[0060] Specifically, the substrate should be baked and dehumidified before being coated with solder paste to avoid poor contact between the solder paste and the substrate, which affects the welding effect.

[0061] Preferably, the soldering position of the SMP connector is tin-plated and gold-removed before step S3, and the connector is cleaned to prevent impurities from affecting the welding effect.

[0062] Preferably, after step S4, the soldered part is atomized and cleaned, and the quality of the soldering points is checked by X-ray.

[0063] Specifically, the tooling is made of aluminum alloy; and the positioning plate and the pressing plate are assembled by using the "pin positioning + self-weight pressing" method. Since the pressing plate and the positioning plate are assembled by using the "pin positioning + self-weight pressing" method, the pressure in the vertical direction (Z-axis) mainly limits the floating, so compared with the existing technology, the contact surface of the substrate and the connector and the upper surface of the connector are subjected to significantly reduced stress, and are not easy to be damaged.

[0064] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A surface mountable SMP connector reflow soldering fixture, characterized by, The tooling includes a positioning plate (1) and a pressing plate (2); the positioning plate (1) includes a connector positioning groove (3); the pressing plate (2) includes a connector pressing block (7).

2. The tooling of claim 1, wherein, The position of the connector positioning groove (3) corresponds to the predetermined position of the surface-mounted SMP connector (12) on the substrate (10), and the shape of the connector positioning groove (3) matches the shape of the surface-mounted SMP connector (12).

3. The tooling of claim 2, wherein, When the connector is square or rectangular, the connector positioning groove (3) should have at least one contact point with the four edges of the connector in the assembled state.

4. The tooling of claim 1, wherein, The positioning plate (1) is also provided with a support block (4) and a positioning pin (5), the position of the support block (4) corresponds to the non-component area or force-bearing area of the substrate (10); the height difference between the lower surface of the positioning pin (5) and the lower surface of the support block (4) is not greater than the thickness of the substrate (10).

5. The tooling of claim 4, wherein, The substrate (10) is pre-provided with a positioning hole (11), the position and size of the positioning pin (5) match those of the positioning hole (11), and the positioning plate (1) is positioned by cooperating with the positioning hole (11) of the substrate (10).

6. The tooling of claim 1 wherein, The positioning plate (1) is also provided with a pressing plate (2) positioning groove.

7. The tooling of claim 1 wherein, The pressing plate (2) includes a connector pressing block (7), the position of the connector pressing block (7) corresponds to the predetermined position of the surface-mounted SMP connector (12) on the substrate (10).

8. The tooling of claim 7, wherein, The connector pressing block (7) is arranged at the central position corresponding to the connector, and the contact area of the two is not less than 30% of the surface area of the connector.

9. The tooling of claim 1 wherein, The pressing plate (2) is also provided with a positioning pressing block (8).

10. The tooling of claim 1, wherein, The pressing plate (2) also includes an exhaust groove (9).

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