Magnetic suction side edge laser welding jig

Abstract

The invention relates to the technical field of welding jigs, in particular to a magnetic side edge laser welding jig which comprises a jig base, a product to be welded is centered on the jig base, the side face of the product in the width direction is a face to be welded, and the side face of the product in the length direction forms a fixed face. The magnetic attraction block is arranged on the jig base and abuts against the fixing face; a magnetic attraction element is arranged on the fixing face, and the product is fixed through magnetic attraction force between the magnetic attraction block and the magnetic attraction element. When the product is centered, the magnetic suction surface of the magnetic suction block is flush with the edge of the fixed surface; the Hall sensor is used for detecting the change of a magnetic field between the magnetic attraction block and the magnetic attraction element and generating a deviation signal when the product deviates from the centering position; the visual detection system is electrically connected with the Hall sensor; deviation correction in the welding process is carried out by inducing magnetic field changes, and the effect of carrying out fixed-point deviation correction on steam impulsive force caused by laser welding is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding jigs, in particular to a magnetic side edge laser welding jig. BACKGROUND

[0002] In the welding process of mobile phones, laser welding is required from the side of the folding screen product. The folding screen module usually contains flexible OLED screens, magnetic elements (neodymium iron boron permanent magnets), titanium alloy hinges, aluminum alloy middle frames and other materials.

[0003] Because the traditional welding jig uses hydraulic clamps for fixation, although the hydraulic clamps provide strong fixation force (>100N), they squeeze the edge of the flexible screen, causing micro-cracks. During welding, local heating causes non-uniform expansion, resulting in interface stress concentration. In order to prevent cracks in the screen, magnetic blocks are used for magnetic fixation. Traditional magnetic jigs rely on permanent magnets or electromagnets to generate an adsorption force of 0.5-1.2 N / cm², which can resist normal assembly stress. However, laser welding produces laser steam, which causes the laser beam focus area (temperature >1500℃) to expand rapidly, and the cold area is constrained to generate compressive stress. This instantaneous stress is greater than the adsorption force of the electromagnet, which can push the screen product to displace, resulting in deviation of the welding position. Therefore, there is a problem of deviation of the welding point position caused by laser welding. SUMMARY

[0004] Therefore, the purpose of the present application is to overcome the problem in the prior art that the magnetic force generated by magnetic fixation is relatively weak compared to the mechanical fixation force during laser welding, and the laser steam generated by laser welding can generate a counterforce to push the fixed screen product, causing inaccurate welding position. Therefore, a magnetic side edge laser welding jig is provided, which can sense the change of the magnetic field through a Hall inductor and correct the deviation, so that the deviated folding screen product is corrected.

[0005] To solve the above technical problems, the present application provides a kind of magnetic side edge laser welding jig, including jig base, the product to be welded is centered on the jig base, the side of the product width direction is the welding surface, and the length direction side forms fixed surface, and the welding jig further includes; Magnetic block, which is arranged on the jig base and abuts against the fixed surface;The fixed surface is provided with a magnetic element, and the product is fixed by the magnetic attraction force between the magnetic block and the magnetic element;Wherein, when the product is centered, the magnetic surface of the magnetic block is flush with the edge of the fixed surface; Hall inductor for detecting the change of the magnetic field between the magnetic block and the magnetic element, and generating a deviation signal when the product deviates from the centered position; a visual detection system electrically connected with the Hall sensor; the visual detection system is configured to trigger image information collection of the product when the offset signal is received, and determine offset information of the product according to the image information; wherein the offset information includes offset position and offset amount; a correction structure including a mechanical bolt slidingly arranged on the jig base, the mechanical bolt is triggered to push the surface to be welded so as to correct the product according to the offset information.

[0006] In an embodiment of the present application, the correction structure includes a mechanical slide extending along the length direction of the jig base, the mechanical bolt is arranged in the mechanical slide, and a power source drives the mechanical bolt to move along the mechanical slide.

[0007] In an embodiment of the present application, the correction structure further includes a telescopic rod slidingly arranged in the mechanical slide, and the telescopic rod is connected with the mechanical bolt.

[0008] In an embodiment of the present application, a rotating shaft is arranged on the mechanical bolt, the rotating shaft is connected with the end of the telescopic rod, and a guide surface abutting against the surface to be welded of the product is arranged on the mechanical bolt.

[0009] In an embodiment of the present application, the visual detection system includes a detection linear module, a moving frame moving along the detection linear module is arranged on the detection linear module, a detection camera is arranged on the moving frame, and the moving direction of the moving frame is arranged along the length direction of the jig base.

[0010] In an embodiment of the present application, the visual detection system further includes an adjusting cylinder, and the telescopic end of the adjusting cylinder is connected with the moving frame.

[0011] In an embodiment of the present application, the surface of the product facing the detection camera is covered in the field angle of the detection camera.

[0012] In an embodiment of the present application, a buffer groove is arranged on the jig base, a buffer platform is arranged in the buffer groove, the magnetic block is arranged on the buffer platform, and a hydraulic damping rod is connected between the buffer platform and the bottom surface of the buffer groove.

[0013] In an embodiment of the present application, a temperature sensor is arranged on the buffer platform, the temperature sensor is configured to detect the welding temperature of the surface to be welded, and the magnetic block increases the magnetic attraction force when the welding temperature rises and the temperature sensor detects the temperature to a first temperature.

[0014] In an embodiment of the present application, the magnetic attraction force of the magnetic block is less than or equal to 0.5-1.2 N / cm².

[0015] The above technical scheme of the present application has the following beneficial effects compared with the prior art: The magnetic side edge laser welding jig provided by the present application can detect the position deviation of the product to be welded through the interaction between the Hall inductor and the magnetic block when the product to be welded is subjected to the recoil force generated by laser welding and the position of the product to be welded changes, and correct the deviation through the deviation correction structure, so that the deviation of the welding point caused by the deviation of the product to be welded during welding is prevented, and the problem of inaccurate welding position is avoided. The magnetic side edge laser welding jig provided by the present application can detect the position deviation of the product to be welded through the interaction between the Hall inductor and the magnetic block when the product to be welded is subjected to the recoil force generated by laser welding and the position of the product to be welded changes, and correct the deviation through the deviation correction structure, so that the deviation of the welding point caused by the deviation of the product to be welded during welding is prevented, and the problem of inaccurate welding position is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to make the content of the present application more easily understood, the present application will be further described in detail below according to specific embodiments of the present application and in conjunction with the accompanying drawings.

[0017] Figure 1 FIG. 1 is a structural schematic diagram of a magnetic side edge laser welding jig according to a preferred embodiment of the present application; Figure 2 FIG. 2 is a partial structural schematic diagram of a deviation correction structure according to a preferred embodiment of the present application; Figure 3 FIG. 3 is a cross-sectional schematic diagram of the present application; Figure 4 FIG. 4 is a structural schematic diagram of a magnetic side edge laser welding jig according to a preferred embodiment of the present application Figure 2 .

[0018] DESCRIPTION OF DRAWINGS 1, jig base; 11, product to be welded; 12, surface to be welded; 13, fixed surface; 14, magnetic block; 141, Hall inductor; 15, buffer groove; 16, buffer table; 17, hydraulic damping rod; 2, visual detection system; 21, detection straight line module; 22, moving frame; 23, detection camera; 24, adjusting cylinder; 3, deviation correction structure; 31, mechanical bolt; 32, mechanical slide; 33, telescopic rod; 34, rotating shaft; 35, guide surface. DETAILED DESCRIPTION

[0019] The present application will be further described below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present application and implement it, but the embodiments are not as a limitation on the present application.

[0020] The embodiment of the present application aims to realize the effect of determining the displacement position of the product to be welded 11 by setting the Hall inductor 141 to sense the magnetic field change of the magnetic attraction, and by confirming the displacement point position caused by laser welding and cooperating with the deviation correction mechanism, the effect of correcting the position deviation of the product to be welded 11 under the action of the laser vapor thrust in the laser welding process is realized, which ensures that each point position welding of the product to be welded surface 12 in the laser welding process can maintain the accuracy of the position of the product to be welded 11, and improves the welding quality.

[0021] Reference Figure 1 , 4 , specifically, a magnetic attraction side laser welding jig is set, which comprises a jig base 1, a product to be welded 11 is centered on the jig base 1, the side of the product in the width direction is a welding surface 12, and the side in the length direction forms a fixed surface 13. The welding jig further comprises: a magnetic attraction block 14, which is arranged on the jig base 1 and abuts against the fixed surface 13; the fixed surface 13 is provided with a magnetic attraction element, and the product is fixed by the magnetic attraction force between the magnetic attraction block 14 and the magnetic attraction element; wherein, when the product is centered, the magnetic attraction surface of the magnetic attraction block 14 is flush with the edge of the fixed surface 13; a Hall inductor 141 is used to detect the magnetic field change between the magnetic attraction block 14 and the magnetic attraction element, and when the product deviates from the centered position, an offset signal is generated; a visual detection system 2 is electrically connected with the Hall inductor 141; the visual detection system 2 is used to trigger the collection of image information of the product when receiving the offset signal, and determine the offset information of the product according to the image information; wherein, the offset information includes the offset position and the offset amount; a deviation correction structure 3, which comprises a mechanical bolt 31 slidingly arranged on the jig base 1, triggers the mechanical bolt 31 to push the welding surface 12 to make the product correct when the offset information is triggered.

[0022] Reference Figure 1 , 4 , a magnetic attraction side laser welding jig is set, which comprises a jig base 1, the jig base 1 is used to place and fix a product to be welded 11, the product to be welded 11 is centered on the jig base 1, and is in a calibrated position for welding. The product to be welded 11 is a folding screen and a hinge frame connecting the folding screen, and the two are welded together at the connecting point. Laser welding process is adopted. The folding screen is divided into a welding surface 12 in the width direction and a fixed surface 13 in the length direction. The hinge frame and the bottom of the welding surface 12 are connected by multi-point welding.

[0023] Reference Figure 1 , 4The magnetic block 14 is fixed on the welding jig, and the magnetic block 14 is a magnetically attracted device connected in an electrically conductive manner. When the circuit is connected, the surface of the magnetic block 14 will generate electromagnetic adsorption, and when the current is increased, the magnetic force will be increased, and the magnetic block 14 can adsorb ferromagnetic materials. The edges of the product to be welded 11 are made of ferromagnetic materials, and the surfaces on both sides of the product to be welded 11 are provided with a plurality of magnetic elements and magnetic induction adsorption with the magnetic block 14. The two fixing surfaces 13 of the product to be welded 11 are respectively abutted on the magnetic block 14, and the magnetic adsorption is realized by electrification. The magnetic force of the magnetic block 14 is generally set to be less than or equal to 0.5-1.2 N / cm². If the magnetic force is too small, the adsorption effect is weak and the product to be welded 11 cannot be effectively fixed. If the magnetic force is too large, the buffer interval is small when facing the impact force of the laser steam, and the surface of the product to be welded 11 is easily damaged. When the product is centered, the product to be welded 11 can be laser welded at multiple points on the welding surface 12. The edge of the magnetic adsorption surface of the magnetic block 14 and the fixing surface 13 are in a flush state. When the product to be welded 11 is displaced, it will partially protrude from the magnetic block 14 in the displacement direction, which can be accurately detected and positioned.

[0024] Reference Figure 1 、 4 Four Hall sensors 141 are fixed on the top of the magnetic block 14, which are respectively located near the four corners of the product to be welded 11, so as to distinguish the specific position of the displacement of the product to be welded 11. When laser welding is performed, the welding steam generated by laser welding, the molten pool at the welding position, the metal vaporization in the molten pool to generate steam plasma, and the back pressure applied to the molten pool wall when the steam is ejected (up to 10-50 N) will push the product to be welded 11 to deviate. When the product to be welded 11 deviates, the product to be welded 11 partially protrudes from the surface of the magnetic block 14, and the adsorption area between the product to be welded 11 and the magnetic block 14 changes, so the magnetic field arrangement also changes. At this time, the Hall sensor 141 close to the magnetic field detects the fluctuation of the magnetic field and sends a deviation signal to confirm the deviation position of the product to be welded 11.

[0025] Reference Figure 1 、 2,3, the visual detection system 2 is used to collect the image information of the product 11 to be welded when receiving the offset signal transmitted by the Hall sensor 141, and the offset information of the product 11 to be welded is determined according to the image information, wherein the offset information includes the offset position and the offset amount, the visual detection system 2 can change its direction according to the transmission signal of the four Hall sensors 141 to confirm the specific offset direction, and then the correction process is carried out through the correction structure 3, the correction structure 3 includes a mechanical bolt 31 slidingly arranged on the jig base 1, the mechanical bolt 31 does not affect the welding process of the welding surface 12 in the natural state, when the visual detection system 2 confirms the offset information of the product 11 to be welded, the mechanical bolt 31 slides to the target position and pushes the product 11 to be welded to be corrected.

[0026] Reference Figure 1 , 2 、3, the correction structure 3 includes a mechanical slide 32 extending along the length direction of the jig base 1, the mechanical bolt 31 is arranged in the mechanical slide 32, and the power source drives the mechanical bolt 31 to move along the mechanical slide 32; the correction structure 3 further includes a telescopic rod 33 slidingly arranged in the mechanical slide 32, the telescopic rod 33 is connected with the mechanical bolt 31; a rotating shaft 34 is arranged on the mechanical bolt 31, the rotating shaft 34 is connected with the end of the telescopic rod 33, and a guide surface 35 abutting against the side wall of the product is arranged on the mechanical bolt 31.

[0027] Reference Figure 1 , 2 、3, the specific structure of the correction structure 3 further includes a mechanical slide 32 opened on the jig base 1 and extending along the length direction thereof, a micro linear module is fixed in the mechanical slide 32, the micro linear module is driven by electricity and drives the mechanical bolt 31 to slide, and the mechanical bolt 31 is driven by the external power source to move along the extension direction of the mechanical slide 32 and stop at the position where the correction is needed; the correction structure 3 further includes a telescopic rod 33 fixed with the moving end of the micro linear module, the telescopic part of the telescopic rod 33 is connected with the mechanical bolt 31, so that the height position of the mechanical bolt 31 can be adjusted, so that the mechanical bolt 31 does not affect the welding of the welding surface 12 in the non-use state, a rotating shaft 34 is arranged on the mechanical bolt 31, the mechanical bolt 31 is rotationally connected with the rotating shaft 34, forming a rolling structure, so that the mechanical bolt 31 can rotate and move along the welding surface 12, extending the stress area of the mechanical bolt 31 pushing the product 11 to be welded, improving the correction effect, and a guide surface 35 abutting against the welding surface 12 of the product is opened on the mechanical bolt 31, reducing the pressure of the mechanical bolt 31 during correction, and preventing the screen from being damaged.

[0028] Reference Figure 1 , 2The visual detection system 2 comprises a detection linear module 21, a moving frame 22 moving along with the detection linear module 21, a detection camera 23 arranged on the moving frame 22, and the moving direction of the moving frame 22 is arranged along the length direction of the jig base 1; the visual detection system 2 further comprises an adjusting cylinder 24, the extension end of the adjusting cylinder 24 is connected with the moving frame 22; the surface of the product facing the detection camera 23 is covered in the field angle of the detection camera 23.

[0029] With reference to Figure 1 , 2 The visual detection system 2 is arranged with the detection linear module 21, the moving frame 22 and the detection camera 23 moving along with the moving frame 22 are arranged on the detection linear module 21; when the offset signal is transmitted by the Hall inductor 141, the control end of the visual detection system 2 determines that the signal is transmitted by one of the four Hall inductors 141, so as to start the detection linear module 21, the moving frame 22 drives the detection camera 23 to move above the Hall inductor 141, at this time, the adjusting cylinder 24 is started, the extension end of the adjusting cylinder 24 pushes the detection camera 23 to approach the surface of the product to be welded 11, the image information is shot at a close distance, and the offset information of the product to be welded 11 is accurately confirmed; in order to ensure the detection accuracy of the detection camera 23, the surface of the product facing the detection camera 23 is generally covered in the field angle of the detection camera 23, the approximate direction of the offset of the product to be welded 11 can be determined by the motion capture before the offset signal of the Hall inductor 141 is transmitted, if the direction determined at this time is contrary to the position of one of the four Hall inductors 141 transmitting the offset signal, manual determination is intervened to confirm the offset information, if the position of the signal transmitted by one of the four Hall inductors 141 is the same, the subsequent process is automatically continued, and the operation accuracy of the correction structure 3 is improved.

[0030] With reference to Figure 1 , 2 The jig base 1 is arranged with a buffer groove 15, the buffer groove 15 is arranged with a buffer table 16, the magnetic suction block 14 is arranged on the buffer table 16, the buffer table 16 and the bottom surface of the buffer groove 15 are connected with a hydraulic damping rod 17; the buffer table 16 is arranged with a temperature sensor, which is used to detect the welding temperature of the surface of the welding surface 12, when the welding temperature is increased and the temperature sensor detects that the temperature is the first temperature, the magnetic suction block 14 increases the adsorption force.

[0031] With reference to Figure 1 , 2A buffer groove 15 is formed on the jig base 1, and a buffer platform 16 is arranged in the buffer groove 15. The magnetic block 14 is fixed on the buffer platform 16. In order to reduce the damage to the surface of the product 11 to be welded caused by the longitudinal force of the laser vapor, a hydraulic damping rod 17 is connected between the buffer platform 16 and the bottom surface of the buffer groove 15. When the impact force of the laser vapor in the longitudinal direction is transmitted to the hydraulic damping rod 17, the hydraulic damping rod 17 is contracted to buffer, so as to reduce the impact force received by the surface of the product 11 to be welded. The hydraulic damping rod 17 is a hydraulic cylinder, which can be automatically reset by power supply, so as to ensure that the position of each laser welding is in the centering position.

[0032] Reference Figure 1 、 2 A temperature sensor is arranged on the buffer platform 16. The laser welding generates a high temperature. When the first temperature is reached, the first temperature is set to 500 DEG C. At this time, the impact force of the vapor generated by the laser welding is the largest. The central control end connected with the magnetic block 14 automatically increases the current, so that the adsorption force of the magnetic block 14 to the ferromagnetic body is increased. The excessive force is prevented from pushing the product 11 to be welded to a displacement distance far away from the centering position of the mechanical bolt 31, so that the centering is not achieved.

[0033] When the laser welding of the folding screen product is performed, the product to be welded and the hinge bracket are stacked and placed on the jig base 1. At this time, the magnetic block 14 is started. The magnetic block 14 is fixed to the product 11 to be welded by the magnetic force. The laser welding head is used to perform the welding of multiple points on the welding surface 12 of the product 11 to be welded, so as to connect the product 11 to be welded and the hinge bracket. The high-temperature vapor is generated during the laser welding. When the temperature of the high-temperature vapor is increased to 500 DEG C, the vapor recoil force caused by the gasification of the metal in the molten pool pushes the product 11 to be welded. At this time, the adsorption force of the magnetic block 14 is increased to prevent the product 11 to be welded from being displaced to a too far distance. Under the action of the increased magnetic adsorption force, the product 11 to be welded is slightly deviated. At this time, one of the four Hall sensors 141 generates a deviation signal. The visual detection system 2 confirms the deviation information and starts the correction system. The mechanical bolt 31 is displaced to the deviation position, is lifted up, and rolls along the welding surface 12. The pushing force generated during the rolling is used to center the product 11 to be welded. After the centering, the next point of the welding surface 12 is welded by the laser, so that the effect of ensuring that the position of each laser welding point is in the centering position is achieved.

[0034] Obviously, the above embodiments are only examples for clearly illustrating, and are not intended to limit the embodiments. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. All the embodiments do not need to be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A magnetic side laser welding jig, comprising a jig base, on which the product to be welded is centered, the side surface of the product in the width direction being the welded surface, and the side surface in the length direction forming the fixing surface, characterized in that: The welding fixture also includes: A magnetic block is disposed on the fixture base and abuts against the fixed surface; a magnetic element is provided on the fixed surface, and the product is fixed by the magnetic attraction between the magnetic block and the magnetic element; wherein, when the product is centered, the magnetic surface of the magnetic block is flush with the edge of the fixed surface; a Hall sensor for detecting a change in the magnetic field between the magnetic block and the magnetic element, and generating an offset signal when the product deviates from a centering position; a visual inspection system electrically connected to the Hall sensor; the visual inspection system is configured to trigger the acquisition of image information of the product upon receiving the offset signal, and determine offset information of the product based on the image information; wherein the offset information includes an offset position and an offset amount; The deviation correction structure includes a mechanical bolt slidably arranged on the fixture base, and the mechanical bolt is triggered according to the offset information to push the surface to be welded so that the product is corrected.

2. The magnetic side laser welding jig according to claim 1, characterized in that: The correction structure includes a mechanical slide extending along the length direction of the fixture base, the mechanical bolt is arranged in the mechanical slide, and a power source drives the mechanical bolt to move along the mechanical slide.

3. The magnetic side laser welding jig according to claim 2, characterized in that: The deviation-correcting structure further includes a telescopic rod slidably arranged in the mechanical slideway, and the telescopic rod is connected to the mechanical bolt.

4. The magnetic side laser welding jig according to claim 3, characterized in that: A rotating shaft is provided on the mechanical bolt, the rotating shaft is connected to the end of the telescopic rod, and a guide surface is provided on the mechanical bolt for contacting with the surface of the product to be welded.

5. The magnetic side laser welding jig according to claim 1, characterized in that: The visual inspection system includes a detection linear module, which is provided with a movable frame that moves following the detection linear module. A detection camera is set on the movable frame, and the moving direction of the movable frame is set along the length direction of the fixture base.

6. The magnetic side laser welding jig according to claim 5, characterized in that: The visual inspection system further comprises an adjusting cylinder, wherein the telescopic end of the adjusting cylinder is connected to the movable frame.

7. The magnetic side laser welding jig according to claim 5, characterized in that: The surface of the product facing the detection camera is covered within the field of view of the detection camera.

8. The magnetic side laser welding jig according to claim 1, characterized in that: A buffer groove is provided on the fixture base, a buffer platform is provided in the buffer groove, the magnetic block is provided on the buffer platform, and a hydraulic damping rod is connected between the buffer platform and the bottom surface of the buffer groove.

9. The magnetic side laser welding jig according to claim 8, characterized in that: A temperature sensor is provided on the buffer table for detecting the welding temperature of the surface of the surface to be welded. When the welding temperature rises and the temperature sensor detects that the temperature reaches a first temperature, the magnetic block increases its adsorption force.

10. The magnetic side laser welding jig according to claim 1, characterized in that: The magnetic attraction force of the magnetic block is less than or equal to 0.5-1.2N / cm².

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