Welding tool based on additive manufacturing

Abstract

The invention relates to a welding tool based on additive manufacturing. The welding tool comprises a fixed base, and the top end of the fixed base provides a positioning base plane for supporting an inverted printed board assembly body in the X-Y direction; the positioning base surface is provided with a plurality of fixing and supporting grooves for the direct-insertion components, and the fixing and supporting grooves provide Z-direction support for the direct-insertion components; the positioning base surface is provided with a plurality of protection grooves for protecting surface-mounted elements and / or surface-mounted components, and a plurality of positioning columns matched with mounting holes of the printed board assembly main body. The device is suitable for manual welding or automatic welding of a printed board assembly after direct-insertion components with different heights are inserted into through holes, tight attachment and high welding precision are achieved, in the horizontal state, the risks of component deviation and printed board deformation caused by inverted welding of the printed board are reduced, the problem that the appearance of welding spots is inconsistent is solved, and the production efficiency is improved. The welding production efficiency, the component position accuracy and the welding spot quality are improved, meanwhile, the production period is flexible, and the manufacturing cost is low.

Description

Technical Field

[0001] The invention relates to the technical field of printed circuit boards and electronic assembly, and more particularly to a welding tool based on additive manufacturing. Background Art

[0002] With the rapid development of surface mount technology (SMT), miniaturized components can be mounted on printed circuit boards (PCBs) for reflow soldering, but high-power power modules (such as relays, etc.) still need to be soldered using through-hole mounting (THT). In the electronics industry, printed circuit board assemblies need to be installed on both sides, that is, a mixed assembly process of surface mounting and through-hole mounting exists in the production process of printed circuit board assemblies. However, since PCB boards are easily deformed and tilted during manual soldering, the position of the installed through-hole components is easily offset, resulting in unstable solder joint quality, and the quality of solder joints produced by different operators is inconsistent, resulting in reduced production efficiency. Welding fixtures have been used in manual soldering and automatic soldering of PCBs, and can fix the horizontal position of printed circuit boards. However, there are problems such as high manufacturing cost, long production cycle, difficult installation, and low service life.

[0003] With the rapid development of additive manufacturing technology, it provides a low-cost, fast, reliable and easy-to-use manufacturing method for industries such as mechanical parts manufacturing, artistic creation and electronics.

[0004] In view of the application of the above background technology, how to provide a manual welding tool based on additive manufacturing that is low-cost, fast to manufacture, easy to install, and has good adaptability is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] To this end, the purpose of the present invention is to propose a welding tool based on additive manufacturing to solve the problems of high cost, long production cycle, difficult installation and short service life of welding tool in additive manufacturing.

[0006] The technical solution of the present invention is a welding tool based on additive manufacturing, including a fixed base, the top of the fixed base is a positioning base surface for providing XY direction support for the inverted printed circuit board assembly body; the positioning base surface has a plurality of fixed support grooves for direct plug-in components, and the fixed support grooves provide Z direction support for the direct plug-in components; the positioning base surface has a plurality of protection grooves for protecting surface mount elements and / or surface mount components, and a plurality of positioning columns that cooperate with the mounting holes of the printed circuit board assembly body.

[0007] According to the technical solution of the present invention, a welding tool based on additive manufacturing also includes a quick-release groove located on the side of the fixed base.

[0008] According to the technical solution of the present invention, the top of the fixing base is recessed downward to form the positioning base surface, and the recessed depth is the same as the thickness of the printed circuit board in the printed circuit board assembly body.

[0009] According to the technical solution of the present invention, the difference between the length of the positioning base surface and the length of the printed circuit board assembly body is 0.3-0.5mm, and the difference between the width of the positioning base surface and the width of the printed circuit board assembly body is 0.3-0.5mm.

[0010] According to the technical solution of the present invention, the specification and size of the fixed support groove is larger than the specification and size of the direct insertion component.

[0011] According to the technical solution of the present invention, the depth of the fixed support groove is equal to the height of the through-hole component, or greater than the height of the through-hole component.

[0012] According to the technical solution of the present invention, the depth of the protection groove is greater than the height of the surface mount component and / or the surface mount element.

[0013] According to the technical solution of the present invention, the depth of the protection groove is the height of the surface mount element and / or surface mount component after installation plus 0.3-0.5 mm.

[0014] According to the technical solution of the present invention, the height of the positioning column is equal to the sum of the depth of the protection groove and the thickness of the printed circuit board in the main body of the printed circuit board assembly.

[0015] According to the technical solution of the present invention, the shape of the fixed support groove matches the shape of the plug-in component.

[0016] It can be seen from the above technical solution that compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention supports the inverted printed circuit board assembly body in the XY direction through the positioning base surface and the positioning column, and the fixed support groove provides support in the Z direction for the plug-in components, ensuring the accurate installation position of the plug-in components, preventing the quality problems caused by the offset of the plug-in components caused by the horizontal movement of the plug-in components, and ensuring that the height of the plug-in components meets the design requirements. After the SMT process, the protection groove effectively protects the surface-mounted components on the printed circuit board assembly from contact with the tooling through the surface-mounted component protection groove, thereby improving the welding production efficiency.

[0018] The fixing support groove of the through-hole component of the present invention can include various shapes to meet the fixing and supporting functions of through-hole components of different shapes and heights.

[0019] The positioning base surface of the present invention realizes horizontal inverted support of the entire printed circuit board assembly, can ensure that the printed circuit board assembly maintains a horizontal state during the welding process, forms molten solder into solder joints with better quality, and significantly reduces the occurrence of solder joint quality defects.

[0020] The double positioning of the printed circuit board assembly body is achieved by inserting a plurality of positioning posts into the positioning holes in the printed circuit board assembly body.

[0021] The present invention has a simple structure, does not require glue dispensing, is easy to install and disassemble, has high welding accuracy, and avoids tilting placement operations, effectively reducing the risk of solder joint appearance not meeting standard requirements, improving the overall quality of electronic products, and improving production efficiency. At the same time, the production cycle is flexible, and it is applicable to both batch products and trial products. Compared with the manufacture of welding tooling through traditional metal milling, additive manufacturing can reduce the loss of tools and material waste caused by metal debris during the manufacturing process. The processing uses carbon fiber reinforced polymer composite materials, which have lower density, weight and price, and can enable the welding tooling to withstand the temperature increased by heat conduction during the device welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the overall structure of a welding tool based on additive manufacturing provided by an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the structure of a printed circuit board assembly body provided by an embodiment of the present invention;

[0025] Figure 3 It is the assembly drawing between the fixed base and the printed circuit board assembly body;

[0026] Figure 4 It is a schematic diagram of the cross-sectional effect of components and welding tooling after the fixed base is connected to the main body of the printed circuit board assembly;

[0027] Figure 5 A schematic diagram of the separation method of the fixed base and the printed circuit board assembly body;

[0028] In the figure: 1. Fixed base; 2. Fixed support groove; 3. Protection groove; 4. Positioning column; 5. Quick disassembly groove; 6. Printed circuit board assembly body; 7. Direct plug components; 8. Surface mount components; 9. Surface mount devices; 10. Mounting holes. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0030] Since welding tools have been used in manual welding and automatic welding of PCBs, and can fix the horizontal position of printed circuit boards, there are problems such as high manufacturing cost, long production cycle, difficult installation, and low service life. In view of this, an embodiment of the present invention provides a welding tool based on additive manufacturing, see the attached Figure 1-5 , including a fixed base 1, the top of which is a positioning base surface for providing XY direction support for the inverted printed circuit board assembly body 6; the positioning base surface has a plurality of fixed support grooves 2 for direct plug components 7, and the fixed support grooves 2 provide Z direction support for the direct plug components 7; the positioning base surface has a plurality of protection grooves 3 for protecting surface mount components 8 and / or surface mount components 9, and a plurality of positioning columns 4 cooperating with the mounting holes 10 of the printed circuit board assembly body 6.

[0031] The protection groove 3 protects the surface mount components 8 and the surface mount devices 9 from being affected by the contact with the welding tool fixing base 1 .

[0032] The above embodiment has a simple structure, does not require glue dispensing, is easy to install and disassemble, has high welding accuracy, and avoids tilted placement operations, effectively reducing the risk of solder joint appearance not meeting standard requirements, improving the overall quality of electronic products, and improving production efficiency. At the same time, the production cycle is flexible and the manufacturing cost is low.

[0033] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "X", "Y", "Z", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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 cannot be understood as a limitation on the present invention.

[0034] In the above embodiment, the center position of the fixed support groove 2 is consistent with the installation center position of the through-hole component 7, which fixes the through-hole component 7 in the horizontal direction and supports the through-hole component 7 in the vertical direction.

[0035] The depth of the fixed support groove 2 is equal to the height of the plug-in component 7, or greater than the height of the plug-in component 7. In a specific embodiment, the depth of the fixed support groove 2 is the height of the plug-in component 7. For example, the depth of the plug-in component fixed support groove 2 of the electrolytic capacitor can be 14 mm. The depth of the plug-in component fixed support groove 2 of the relay can be 11 mm.

[0036] In the above embodiments, the size of the fixed support groove 2 is larger than the size of the through-hole component 7. The shape of the fixed support groove 2 matches the shape of the through-hole component 7. The shape of the fixed support groove 2 can include any one or two of rectangular, square, circular, elliptical, etc.

[0037] For example, the length and width are 0.3-0.5mm larger than the length and width of the rectangular component to ensure that the plug-in component can be installed in the slot. The diameter of the fixed support slot 2 is 0.-0.5mm larger than the diameter of the cylindrical component to ensure that the plug-in component can be installed in the slot.

[0038] In one embodiment of the present invention, the depth of the protection groove 3 is greater than the height of the surface mount component 8 and / or the surface mount component 9. Specifically, the depth of the protection groove 3 is the maximum height of the surface mount component 8 and the surface mount component 9 plus 1 mm. If the maximum height of the surface mount component 8 and the surface mount component 9 is 3 mm, the depth of the surface mount component protection groove 3 is 4 mm.

[0039] The depth of the protection groove 3 can be selected to be the height of the surface mount component 8 and / or the surface mount element 9 after installation plus 0.3-0.5 mm.

[0040] In another embodiment of the invention, the positioning column 4 can be installed in the mounting hole 10 of the printed circuit board assembly body 6, and plays a role in fixing the horizontal direction (i.e., XY direction) position of the printed circuit board assembly body 6. In this embodiment, the positioning column 4 is inserted into the positioning hole 10 for matching connection, and the positioning column 4 plays a role in positioning the printed circuit board assembly body 6.

[0041] The positioning column 4 and the fixed base 1 together play the role of fixing the horizontal position of the printed circuit board assembly body 6.

[0042] The height of the positioning column 4 is equal to the depth of the protection groove 3 plus the thickness of the printed circuit board in the printed circuit board assembly body 6.

[0043] In some other embodiments of the present invention, the quick disassembly groove 5 can quickly separate the printed circuit board assembly body 6 from the welding fixture fixed base 1 after welding is completed. The quick disassembly groove 5 can be provided with chamfers on the four corners of the fixed base.

[0044] In other embodiments of the present invention, the top of the fixing base 1 is recessed downward to form the positioning base surface, and the recessed depth is the same as the thickness of the printed circuit board in the printed circuit board assembly body 6, ensuring that the printed circuit board assembly body is placed in the recessed groove.

[0045] Specifically, the difference between the length of the positioning base surface and the length of the printed circuit board assembly body 6 is 0.3-0.5mm, and the difference between the width of the positioning base surface and the width of the printed circuit board assembly body 6 is 0.3-0.5mm, which facilitates the printed circuit board assembly body to be placed in the recessed groove.

[0046] In the embodiment of the present invention, the height of the positioning column 4 is equal to the sum of the depth of the protection groove 3 and the thickness of the printed circuit board in the printed circuit board assembly body 6 .

[0047] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0048] The tooling of the present invention is applied to the manual welding or automatic welding process after the SMT process. After the surface plug-in components 7 are installed to the corresponding positions on the printed circuit board assembly body 6 according to the design requirements, the printed circuit board assembly body 6 is placed horizontally. In the process of using the welding tooling, the plug-in components 7 on the printed circuit board assembly body 6 are placed in the fixed support groove 2 inside the fixed base 1, and the surface mount components 8 and surface mount devices 9 on the printed circuit board assembly body 6 do not come into contact with the surface mount component protection groove 3. The positioning column 4 in the fixed base 1 is placed in the installation positioning hole 10 of the printed circuit board assembly body 6. The printed circuit board assembly body 6 is placed in the fixed base 1 to achieve a tight fit. Finally, the assembly assembly of the printed circuit board assembly body 6 and the welding tooling based on additive manufacturing is horizontally flipped 180° and placed horizontally on the anti-static table to prepare for welding.

[0049] The present invention fixes and supports the plug-in components 7 on the printed circuit board assembly body 6 through the plug-in component fixing support groove 2, so that the printed circuit board assembly can remain horizontal in an inverted state. The plug-in components 7 are fixed by the plug-in component fixing support groove 2 in the horizontal direction and supported by the plug-in component fixing support groove 2 in the vertical direction. Therefore, the plug-in components 7 will not shake after installation, and electronic assembly with high precision, high solder joint quality and high reliability can be achieved.

[0050] The present invention supports the entire printed circuit board assembly body 6 by a fixed base 1, the fixed support groove 2 can provide support for the direct-insert components 7, and the protection groove 3 for the surface-mount components can protect the surface-mount components 8 and the surface-mount devices 9 on the printed circuit board assembly body 6, thereby realizing a rapid manufacturing process in a mixed assembly manner.

[0051] The present invention effectively fixes the connection between the printed circuit board assembly body 6 and the additive manufacturing tooling through the fixed base 1 and the positioning column 4. The fixed base 1 can stably support the printed circuit board assembly body 6 in the horizontal direction, maintain the overall horizontal state in the vertical direction, and limit the movement of the printed circuit board assembly body 6 in the horizontal direction. The positioning column 4 is connected with the mounting hole 10 on the printed circuit board assembly body 6, further fixing the horizontal position of the printed circuit board assembly body 6 to be stable, and meeting the design requirements of the position of the direct insertion component 7.

[0052] The present invention has the obvious advantages of integrated structure, simple design, fast manufacturing, low cost, and fast installation and disassembly, and solves the problem of accurate fixation of the printed circuit board assembly body by welding tooling, and effectively solves the problem of horizontal placement of the printed circuit board assembly under inverted welding conditions through the complex shape and different height direct-insertion component fixing support grooves, and realizes high-precision, high-stability, high-productivity, high-solder joint quality, and high-reliability welding, thereby improving productivity. It is not only suitable for the quality stability control of batch products, but also applicable to trial products with higher quality requirements.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0054] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A welding tool based on additive manufacturing, characterized in that: The invention comprises a fixed base (1), the top of which is a positioning base surface for providing XY direction support for an inverted printed circuit board assembly body (6); the positioning base surface has a plurality of fixed support grooves (2) for direct plug-in components (7), and the fixed support grooves (2) provide Z direction support for the direct plug-in components (7); the positioning base surface has a plurality of protection grooves (3) for protecting surface mount elements (8) and / or surface mount components (9), and a plurality of positioning columns (4) matched with mounting holes (10) of the printed circuit board assembly body (6).

2. The welding tool based on additive manufacturing according to claim 1, characterized in that: It also includes a quick-release slot (5) located on the side of the fixed base (1).

3. The welding tool based on additive manufacturing according to claim 1, characterized in that: The top of the fixing base (1) is recessed downward to form the positioning base surface, and the recessed depth is the same as the thickness of the printed circuit board in the printed circuit board assembly body (6).

4. The welding tool based on additive manufacturing according to claim 3, characterized in that: The difference between the length of the positioning base surface and the length of the printed circuit board assembly body (6) is 0.3-0.5 mm, and the difference between the width of the positioning base surface and the width of the printed circuit board assembly body (6) is 0.3-0.5 mm.

5. The welding tool based on additive manufacturing according to claim 1, characterized in that: The specification and size of the fixed support groove (2) is greater than the specification and size of the plug-in component (7).

6. The welding tool based on additive manufacturing according to claim 1, characterized in that: The groove depth of the fixed support groove (2) is equal to the height of the direct insertion component (7), or greater than the height of the direct insertion component (7).

7. The welding tool based on additive manufacturing according to claim 1, characterized in that: The depth of the protection groove (3) is greater than the height of the surface mount component (8) and / or the surface mount element (9).

8. The welding tool based on additive manufacturing according to claim 1, characterized in that: The depth of the protection groove (3) is the height of the surface mount component (8) and / or the surface mount element (9) after installation plus 0.3-0.5 mm.

9. The welding tool based on additive manufacturing according to claim 3, characterized in that: The height of the positioning column (4) is equal to the sum of the depth of the protection groove (3) and the thickness of the printed circuit board in the printed circuit board assembly body (6).

10. A welding tool based on additive manufacturing according to any one of claims 1 to 9, characterized in that: The shape of the fixed support groove (2) matches the shape of the plug-in component (7).

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