Multi-step millimeter-scale bonding pad automatic laser welding system

Abstract

The utility model relates to a multi-step millimeter-level bonding pad automatic laser welding system, belongs to the technical field of welding equipment, and solves the problems that a weldment with a special structure is not easy to fix, the positioning precision and the welding precision are poor, the automation degree is low and the like in the prior art. The utility model provides a multi-step millimeter-level bonding pad automatic laser welding system. The welding system comprises a tool clamping module, a welding spot calibration module, a laser welding module, a movable workbench, an X-axis guide rail, a Y-axis guide rail and a Z-axis guide rail. Wherein the tool clamping module comprises a tool pedestal, a detachable clamping device and a spray head inspection camera, and the tool clamping module is integrated on the X-axis guide rail. According to the equipment, a series of functions such as feeding, discharging, calibration and recording can be automatically completed, millimeter-level positioning precision and welding precision can be achieved, welding spots are attractive, and the one-time welding success rate is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to welding equipment technical field especially relates to a millimeter level pad automatic laser welding system of multi -step. BACKGROUND

[0002] For the antenna product, since its internal space is small, and the precision and integration of the antenna product are extremely high, and the tiny welding spot can save space, meet the compactness and light weight demand. In addition, the antenna product needs to ensure that the welding spot has good conductivity, stability and low loss characteristics, and the tiny welding spot can meet the above conditions, greatly improve the product performance and reliability, and therefore is widely used in the printed board assembly of the antenna product. However, with the miniaturization and integration of the printed board assembly, manual welding becomes more and more challenging.

[0003] Laser welding is an advanced processing technology, mainly using high energy density laser beam as heat source to irradiate the welding spot with a certain power, so as to realize the welding between the printed board pad and the device. Compared with manual welding, the non-contact method adopted by laser welding will not produce mechanical pressure or friction; the welding speed is extremely fast, which can greatly improve the welding efficiency; after combined with modern numerical control, it is easy to realize multi-step automation production, and provides conditions for more precise welding.

[0004] At present, the existing welding equipment or system has the problems of inconvenient replacement (feeding and discharging) of the welding piece, high difficulty of clamping the welding piece with special structure, poor positioning accuracy, welding precision to be improved, and the need for additional pre-welding and post-welding inspection equipment. UTILITY MODEL CONTENTS

[0005] In view of the above analysis, the utility model aims to provide a millimeter level pad automatic laser welding system of multi-step, which can solve at least one of the problems of inconvenient replacement (feeding and discharging) of the welding piece, high difficulty of clamping the welding piece with special structure, poor positioning accuracy, welding precision to be improved, and the need for additional pre-welding and post-welding inspection equipment in the existing welding equipment or system.

[0006] The utility model mainly aims to realize the following technical schemes:

[0007] The utility model provides a millimeter level pad automatic laser welding system of multi-step, the welding system includes frock clamping module, welding spot calibration module, laser welding module, movable worktable 19 and X, Y, Z axis guide rail;

[0008] The welding spot calibration module and the laser welding module are integrated on the movable worktable 19, the movable worktable 19 can move along the Z axis guide rail 12, the movable worktable 19 and the Z axis guide rail 12 can move along the Y axis guide rail 11 together;

[0009] The tool clamping module comprises a tool seat 4, a detachable clamping device 1, and a nozzle inspection camera 3, and is integrated on the X-axis guide rail 2;

[0010] The tool seat 4 is movably connected to the X-axis guide rail 2 of the welding system and can move along the sliding rail direction. The tool seat 4 is provided with a cavity in the center, the shape of which matches that of the detachable clamping device 1, and the detachable clamping device 1 is arranged in the cavity. The nozzle inspection camera 3 is connected to the side of the tool seat 4, with the lens direction vertically upward, for pre-welding nozzle 13 state inspection.

[0011] The detachable clamping device 1 is in a cylindrical structure, and the upper and lower end faces are annular, connected by no less than three support columns. The upper end face is provided with a first clamping groove 5 and a second clamping groove 6 which are perpendicular to each other and extend in the radial direction.

[0012] Specifically, the detachable clamping device 1 is suitable for welding of special-shaped components, which include an A plate, a B plate, and a balun plate.

[0013] The A plate and the B plate are rectangular and have matching splicing grooves. In the assembled state, the A plate and the B plate are perpendicular to each other, and the upper and lower end faces are flush.

[0014] The upper end faces of the A plate and the B plate are provided with a micro antenna 17.

[0015] The balun plate is circular and has an antenna through hole 18 corresponding to the position of the micro antenna 17.

[0016] In the assembled state, the A plate and the B plate are spliced through the splicing grooves and respectively embedded in the first clamping groove 5 and the second clamping groove 6. The balun plate is located above the A plate and the B plate, and the micro antenna 17 passes through the antenna through hole 18 reserved on the balun plate.

[0017] Further, the upper end face of the detachable clamping device 1 is also provided with at least three protective columns, which are suitable for welding scenarios where the size of the balun plate is smaller than that of the upper end face of the detachable clamping device 1.

[0018] In the assembled state, the upper surface of the protective column is higher than the upper surface of the balun plate.

[0019] In the welding preparation stage, a plurality of assembled detachable clamping devices 1 and special-shaped components can be stacked and stored without damaging the balun plate.

[0020] Preferably, the tool seat 4 is further provided with a fixing device for fixing the position of the tool seat 4 on the X-axis guide rail 2; the fixing device is a fastening screw or a buckle.

[0021] Preferably, the upper surface of the nozzle inspection camera 3 is provided with a protective cover to avoid contamination and damage of the camera lens.

[0022] Specifically, the welding point calibration module comprises a laser height gauge 7, an aperture 8, a lens 9 and a calibration camera 10.

[0023] The calibration camera 10, the lens 9 and the aperture 8 are coaxially installed in sequence from top to bottom and jointly constitute a photographing unit; the laser height gauge 7 is located at the side of the photographing unit.

[0024] The photographing unit and the laser height gauge 7 are installed in the lower half area of the movable workbench 19.

[0025] Specifically, the laser welding module comprises a nozzle 13, a light spot adjuster 14, a temperature control device 15 and a laser irradiation device 16.

[0026] The nozzle 13 is located at the lowermost part of the laser welding module, the laser irradiation device 16 is located directly above the nozzle 13, and the temperature control device 15 is located above the side of the nozzle 13.

[0027] The nozzle 13, the light spot adjuster 14, the temperature control device 15 and the laser irradiation device 16 are all installed in the lower half area of the movable workbench 19.

[0028] Preferably, the power of the laser irradiation device 16 is greater than or equal to 100w.

[0029] Further, the welding system further comprises an external multimedia recording module, which is used for recording and storing the welding process and the final welding effect.

[0030] Specifically, the welding system can realize a whole set of working step flow process of loading the product to be welded, pre-welding inspection, laser welding, multimedia recording and unloading the finished product; the three-axis positioning adjustment precision of the welding system is ±0.01mm.

[0031] Compared with the prior art, the utility model can realize at least one of the following beneficial effects:

[0032] 1. The welding system provided by the utility model has the advantages of convenient feeding and discharging, and is especially suitable for the welding of special structure welding pieces. The utility model adopts detachable clamping tools, and preassembly with the welding pieces can be realized, for example, a large number of clamping tools and welding pieces are preassembled in the welding preparation stage, so that feeding and discharging can be quickly realized in the actual production process. Further, the clamping tools are provided with a first clamping groove and a second clamping groove according to the special structure of the welding pieces, so that the welding pieces are firmly fixed and the positioning accuracy and welding accuracy are improved. More preferably, protective columns can be additionally arranged on the upper end surface of the clamping tool to avoid damage to the welding pieces in the stacking process.

[0033] 2. The welding system provided by the utility model can realize pre-welding inspection, pre-welding positioning and post-welding effect inspection, and is helpful to improve the welding accuracy and the convenience of welding, and the positioning and welding accuracy are high.

[0034] The welding system can check the state of the nozzle before welding through the nozzle inspection camera; the position of the welding spot and the height of the nozzle are measured and calibrated through the welding spot calibration module, and precise welding spot / nozzle positioning is realized through X, Y and Z axis guide rails, and the positioning accuracy is ±0.01mm; after welding, the welding spot calibration module can be used to take pictures of the welding position again and store the pictures, and the welding quality is recorded and evaluated through the external multimedia recording module.

[0035] 3. The welding system provided by the utility model has high welding efficiency, and each module can cooperate to complete the whole process of "welding product feeding, pre-welding inspection, laser welding, multimedia recording and welding product discharging", and the complete process time of a single product is about 15 seconds, and the three-axis positioning adjustment accuracy of the system is ±0.01mm.

[0036] 4. The system of the utility model is very simple to operate, and an inexperienced operator can independently complete the welding operation after training for ten minutes, so that the demand for senior technicians can be reduced, and human resources can be significantly saved.

[0037] In the utility model, the above 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 can be understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained through the content specially pointed out in the text and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0038] The drawings are only used for the purpose of showing the specific embodiments, and are not considered as limitations of the utility model, and the same reference signs represent the same parts in the whole drawings.

[0039] Figure 1 A schematic diagram of a possible clamping tooling module structure;

[0040] Figure 2 A schematic diagram of a possible solder joint calibration module structure is shown in FIG.

[0041] Figure 3 A schematic diagram of a possible laser welding module structure;

[0042] Figure 4 A schematic diagram of a possible movable workbench and Y and Z axis guide rail structure;

[0043] Figure 5 This is a schematic diagram of the assembly of a special structure to be welded;

[0044] Figure 6 Schematic diagram of the module composition of the millimeter-level pad automatic laser welding system.

[0045] Reference numerals:

[0046] 1. Removable clamping device; 2. X-axis guide rail; 3. Printhead inspection camera; 4. Workbench; 5. First card slot; 6. Second card slot; 7. Laser altimeter; 8. Aperture; 9. Lens; 10. Calibration camera; 11. Y-axis guide rail; 12. Z-axis guide rail; 13. Printhead; 14. Spot adjuster; 15. Temperature control device; 16. Laser irradiation device; 17. Micro antenna; 18. Antenna through hole; 19. Movable workbench. DETAILED DESCRIPTION

[0047] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, and are not used to limit the scope of the present invention.

[0048] The purpose of this utility model is mainly achieved through the following technical solutions:

[0049] The utility model provides a multi-step millimeter-level pad automatic laser welding system, the welding system includes a tool clamping module, a welding point calibration module, a laser welding module, a movable workbench 19 and X, Y, and Z axis guide rails;

[0050] The welding point calibration module and the laser welding module are integrated on the movable workbench 19 (such as Figure 4 As shown), the movable workbench 19 can move along the Z-axis guide rail 12, and the movable workbench 19 and the Z-axis guide rail 12 can move together along the Y-axis guide rail 11;

[0051] The fixture clamping module comprises a fixture base 4, a detachable clamping device 1 and a nozzle inspection camera 3, and is integrated on the X-axis guide rail 2; the module is integrated on the X-axis, can assist in height calibration of the nozzle 13, and position the product welding position;

[0052] The detachable clamping device 1 is adopted, the dismounting and replacement speed is about 3 seconds, products of different sizes can be installed, and preassembly with a to-be-welded part can be realized; for example, a large number of clamping devices and to-be-welded parts are preassembled in the welding preparation stage, which facilitates rapid feeding and discharging in the actual production process; therefore, when the production line task is full, the number of clamping devices can be increased, and the valve plate clamping device is first installed in batches, so that rapid part replacement can be realized during welding, and the production efficiency is greatly improved.

[0053] The fixture base 4 is movably connected to the X-axis guide rail 2 of the welding system and can move along the sliding rail direction; the fixture base 4 is provided with a cavity in the center, the cavity is matched with the shape of the detachable clamping device 1, and the detachable clamping device 1 is arranged in the cavity; the nozzle inspection camera 3 is connected to the side of the fixture base 4, the lens direction is vertically upward, is used for pre-welding nozzle 13 state inspection, can check the nozzle 13 state during system initialization, judge whether there is excess tin ball in the nozzle 13, whether there is residual tin liquid, tin bead and other excess matters at the nozzle of the nozzle 13;

[0054] The detachable clamping device 1 is a cylindrical structure, the upper and lower end faces are annular, and the upper and lower end faces are connected through not less than three supports; the upper end face is provided with a first clamping groove 5 and a second clamping groove 6 which are perpendicular to each other and extend in the radial direction, so that the to-be-welded part is firmly fixed and the positioning accuracy and welding accuracy can be improved.

[0055] Further, the external display of the nozzle inspection camera 3 can realize real-time collection of the to-be-welded position image, the clamping fixture module can be set to return to the starting position at any time through a program, and the relative position of the micro antenna 17 and the through hole or the excess flux can be adjusted or cleaned by an operator at any time.

[0056] Specifically, the detachable clamping device 1 is suitable for welding of special-shaped components, and the special-shaped components include an A plate, a B plate and a valve plate;

[0057] The A plate and the B plate are rectangular and have mutually matched splicing grooves; in the assembled state, the A plate and the B plate are perpendicular to each other and the upper and lower end faces are flush;

[0058] The A plate and the B plate are provided with a micro antenna 17 on the upper end face;

[0059] The valve plate is circular and is provided with an antenna through hole 18 corresponding to the position of the micro antenna 17.

[0060] In the assembled state, the A plate and the B plate are spliced through the splicing groove and embedded in the first clamping groove 5 and the second clamping groove 6 respectively, the balun plate is located above the A plate and the B plate, and the micro antenna 17 passes through the antenna through hole 18 reserved on the balun plate.

[0061] Further, the upper end surface of the detachable clamping device 1 is also provided with at least three protective columns, which are suitable for welding scenarios where the size of the balun plate is smaller than the size of the upper end surface of the detachable clamping device 1.

[0062] In the assembled state, the upper surface of the protective column is higher than the upper surface of the balun plate.

[0063] During the welding preparation stage, a plurality of assembled detachable clamping devices 1 and special-shaped components can be stacked and stored without damaging the balun plate.

[0064] Preferably, the tool seat 4 is also provided with a fixing device for fixing the position of the tool seat 4 on the X-axis guide rail 2; the fixing device is a fastening screw or a buckle.

[0065] Preferably, the upper surface of the nozzle inspection camera 3 is provided with a protective cover to avoid contamination and damage to the camera lens.

[0066] Specifically, the welding point calibration module includes a laser height gauge 7, an aperture 8, a lens 9, and a calibration camera 10.

[0067] The calibration camera 10, the lens 9, and the aperture 8 are coaxially installed from top to bottom, together forming a photographing unit; the laser height gauge 7 is located to the side of the photographing unit.

[0068] The photographing unit and the laser height gauge 7 are installed in the lower half of the movable workbench 19.

[0069] Specifically, the laser height gauge 7 has high precision and is less affected by the environment. For products made of balun plate material, the laser height gauge 7 is less affected by the color or angle. Therefore, when the surface of the balun plate is contaminated or scratched, the accuracy can still be ensured, and the production quality can be effectively guaranteed in batch production.

[0070] Specifically, in one possible design, the lens 9 is in the shape of a cylinder, with the end extending into the middle of the aperture 8 ring; the calibration camera 10 is in the shape of a cuboid, located at the upper end of the cylindrical lens 9, locked with the lens 9 by screws, and installed on the movable workbench 19; the laser height gauge 7 is located at the lower right of the module.

[0071] It is worth mentioning that the specific calibration process is: taking a photo of the welding position before welding and transmitting the pad position information to the system external display screen, so that it can clearly show whether the flux coating amount in the selected range meets the requirements; the laser height gauge 7 calibrates the height by the light spot paper attached to the tool. According to the real-time feedback photo, the system can judge whether the welding crosshair is consistent with the center point of the pad, and automatically adjust.

[0072] Specifically, the laser welding module includes a spray head 13, a light spot regulator 14, a temperature control device 15, and a laser irradiation device 16.

[0073] The spray head 13 is located at the lowermost part of the laser welding module, and the laser irradiation device 16 is located directly above the spray head 13, which can control the size of the laser power;

[0074] The temperature control device 15 is located above the side of the spray head 13. This device can monitor the temperature in real time, with a response time of less than 1ms and an accuracy of 3℃. The welding temperature can be displayed through a visual digital display according to the preset temperature curve;

[0075] The light spot regulator 14 adjusts the diameter of the irradiation light spot through two knobs, and controls the diameter of the light spot through defocusing;

[0076] The spray head 13, the light spot regulator 14, the temperature control device 15, and the laser irradiation device 16 are all installed in the lower half of the movable workbench 19.

[0077] Preferably, the power of the laser irradiation device 16 is ≥100w.

[0078] Further, the spray ball diameter, laser power and other parameters of the laser welding process can be changed according to different products, and different parameter process templates can be saved. When multiple production tasks are scheduled, the templates can be called immediately to complete the flexible scheduling task conversion.

[0079] Further, the welding system further comprises an external multimedia recording module, which is used for recording and storing the welding process and the final welding effect.

[0080] Specifically, the welding system can realize a complete set of work step flow of product loading, pre-welding inspection, laser welding, multimedia recording, and finished product unloading; the three-axis positioning adjustment accuracy of the welding system is ±0.01mm.

[0081] Further, after the system hardware is completely installed, considering the lead smoke hazard caused by welding, the welding system is also provided with a purifier for filtering particulate matter; considering that long-time operation can cause high heat in the case, a fan is arranged for heat dissipation, and the fan is easy to replace; the modular design of the power supply, the controller, the laser and the like facilitates disassembly and maintenance, and can greatly reduce the cost; the system is simple and easy to operate, the product welding quality is reliable, and the appearance is perfect.

[0082] Further, the welding system is also provided with a waste box, before laser welding, it is necessary to check whether the dropping trajectory of the spray ball remains vertical, usually the method of trial operation is adopted to observe, at this time, tin beads can be effectively avoided from splashing, in addition, the waste box is convenient to disassemble and replace, and the cost is extremely low.

[0083] For example, taking a certain antenna product as an example (such as Figure 5 The specific welding method is as follows:

[0084] The operator inserts the B plate into the first clamping groove 5, inserts the A plate into the second clamping groove 6, at this time, the A plate and the B plate are perpendicular to each other, then the baron plate is installed above the A plate and the B plate, and the feeding is completed. After clicking "return", the system enters initialization, and then the spray head 13 automatically tries to hit the ball once above the waste box. This step completes the vertical precision verification of the ball hitting, at this time, the waste box can completely collect the dropped soldering tin balls, and effectively avoid tin beads from splashing. After clicking "spray head 13 calibration", the spray head inspection camera 3 inspects the inside of the through hole of the spray head 13 and the nozzle to ensure that there is no excess material.

[0085] After clicking "one-key calibration", the welding point calibration module starts to automatically measure the height, and after completion, the camera takes a photo of the welding point position. This step can judge whether the amount of flux coating and the welding point position meet the standard through real-time feedback of the photographed photo, and greatly increases the welding point weldability inspection efficiency.

[0086] If it meets the standard, click "welding" to start automatic welding, the system calculates the optimal amount of tin balls, and quickly irradiates the laser to complete the welding action. This step completes automatic welding according to the preset values of the welding pad diameter, laser power, irradiation time and the like, and the preset values can be stored as different named schemes, and different schemes can be directly called after starting up.

[0087] Clicking "to the shooting position" can observe the welding effect diagram of any welding point, and all effect diagrams can be saved to a local folder. The above merely describes a preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered within the protection scope of the utility model.

Claims

1. A multi-step millimeter-level pad automatic laser welding system, characterized in that: The welding system comprises a tooling clamping module, a welding point calibration module, a laser welding module, a movable workbench (19) and X-axis, Y-axis and Z-axis guide rails; The welding point calibration module and the laser welding module are integrated on a movable workbench (19); the movable workbench (19) is movable along a Z-axis guide rail (12); and the movable workbench (19) and the Z-axis guide rail (12) are movable together along a Y-axis guide rail (11); The tooling clamping module comprises a tooling pedestal (4), a detachable clamping device (1), and a nozzle inspection camera (3), and the tooling clamping module is integrated on the X-axis guide rail (2); The tooling pedestal (4) is movably connected to the X-axis guide rail (2) of the welding system and can move along the slide rail direction; a cavity is provided at the center of the tooling pedestal (4), the shape of the cavity matches the shape of the detachable clamping device (1), and the detachable clamping device (1) is provided in the cavity; the nozzle inspection camera (3) is connected to the side of the tooling pedestal (4), with the lens facing vertically upward, and is used to inspect the status of the nozzle (13) before welding; The detachable clamping device (1) is a cylindrical structure, the upper and lower end surfaces are annular, the upper and lower end surfaces are connected by no less than three pillars, and the upper end surface is provided with a first card slot (5) and a second card slot (6) that are perpendicular to each other and extend radially.

2. The welding system according to claim 1, characterized in that The detachable clamping device (1) is suitable for welding components of special shapes, and the components of special shapes include A plate, B plate and balun plate; The A and B plates are rectangular and have matching joint grooves. In the assembled state, the A and B plates are perpendicular to each other and the upper and lower end surfaces are flush. The upper end surfaces of the A plate and the B plate are provided with miniature antennas (17); The balun plate is circular and has an antenna through hole (18) reserved therein corresponding to the position of the miniature antenna (17); In the assembled state, the A plate and the B plate are spliced ​​together through the splicing groove and respectively embedded in the first card slot (5) and the second card slot (6); the balun board is located above the A plate and the B plate; and the miniature antenna (17) passes through the antenna through hole (18) reserved on the balun board.

3. The welding system according to claim 2, characterized in that The upper end surface of the detachable clamping device (1) is also provided with at least three protective columns, and the protective columns are suitable for welding scenarios where the size of the balun plate is smaller than the size of the upper end surface of the detachable clamping device (1); In the assembled state, the upper surface of the protective column is higher than the upper surface of the balun board.

4. The welding system according to claim 1, wherein: The tooling pedestal (4) is also provided with a fixing device, and the fixing device is used to fix the position of the tooling pedestal (4) on the X-axis guide rail (2); the fixing device is a fastening screw or a buckle.

5. The welding system according to claim 1, wherein: The upper surface of the nozzle inspection camera (3) is provided with a protective cover.

6. The welding system according to claim 1, wherein: The welding point calibration module comprises a laser altimeter (7), an aperture (8), a lens (9) and a calibration camera (10); The calibration camera (10), lens (9) and aperture (8) are coaxially mounted in sequence from top to bottom, and together form a photographic unit; the laser altimeter (7) is located to the side of the photographic unit; The camera unit and the laser altimeter (7) are installed in the lower half of the movable workbench (19).

7. The welding system according to claim 1, wherein: The laser welding module includes a nozzle (13), a spot adjuster (14), a temperature control device (15) and a laser irradiation device (16); The nozzle (13) is located at the bottom of the laser welding module, the laser irradiation device (16) is located directly above the nozzle (13), and the temperature control device (15) is located above the side of the nozzle (13); The nozzle (13), the light spot adjuster (14), the temperature control device (15) and the laser irradiation device (16) are all installed in the lower half of the movable workbench (19).

8. The welding system according to claim 7, characterized in that The power of the laser irradiation device (16) is ≥100w.

9. The welding system according to claim 1, wherein: The welding system further comprises an external multimedia recording module, which is used to record and store the welding process and the final welding effect.

10. The welding system according to claim 1, wherein: The welding system is used to realize a complete set of process steps including loading of products to be welded, pre-weld inspection, laser welding, multimedia recording, and unloading of welded finished products; the three-axis positioning adjustment accuracy of the welding system is ±0.01mm.

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