CN116160116A - Welding process of folding screen assembly - Google Patents
Welding process of folding screen assembly Download PDFInfo
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- CN116160116A CN116160116A CN202310207819.4A CN202310207819A CN116160116A CN 116160116 A CN116160116 A CN 116160116A CN 202310207819 A CN202310207819 A CN 202310207819A CN 116160116 A CN116160116 A CN 116160116A
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- 238000003466 welding Methods 0.000 title claims abstract description 228
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000000835 fiber Substances 0.000 claims abstract description 13
- 238000003825 pressing Methods 0.000 claims description 27
- 238000009434 installation Methods 0.000 claims description 15
- 230000006835 compression Effects 0.000 claims description 13
- 238000007906 compression Methods 0.000 claims description 13
- 239000013307 optical fiber Substances 0.000 claims description 6
- 230000000052 comparative effect Effects 0.000 description 19
- 230000005389 magnetism Effects 0.000 description 4
- 238000004383 yellowing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
- B23K26/22—Spot welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/04—Automatically aligning, aiming or focusing the laser beam, e.g. using the back-scattered light
- B23K26/046—Automatically focusing the laser beam
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/04—Automatically aligning, aiming or focusing the laser beam, e.g. using the back-scattered light
- B23K26/046—Automatically focusing the laser beam
- B23K26/048—Automatically focusing the laser beam by controlling the distance between laser head and workpiece
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention relates to the field of electronic display screens, and particularly discloses a welding process of a folding screen assembly, which comprises the following steps S1-S4, wherein in the step S3, the laser energy of a fiber laser is set to be 0.80J-0.92J, a focusing lens focuses laser to form a focus, and the focus position moves by 1.2-1.4mm towards one side close to a to-be-welded piece by taking one side of the to-be-welded piece far away from a second welding surface as a reference surface; in step S4, the welding point a and the welding point C are sequentially located on a side of the piece to be welded close to the center, the welding point D and the welding point B are sequentially located on a side of the piece to be welded away from the center, and the welding point E and the welding point F are located among the welding point a, the welding point B, the welding point C and the welding point D. According to the scheme, the burr-free surface of a welded product is realized by adjusting welding energy, welding height, welding spot size and welding spot mode, deformation is avoided, welding strength is more than 15N thrust, and welding of a small guide piece and a piece to be welded can be efficiently and accurately completed.
Description
Technical Field
The invention relates to the technical field of electronic display screens, in particular to a welding process of a folding screen assembly.
Background
With the development of mobile phones, flat panels and television screens, folding screens become a new form of future screen selection, and in the mainstream mode of folding screens, pattern pieces and strip pieces as shown in fig. 1 of the specification are adopted, and in order to realize folding rotation of the pattern pieces and the strip pieces, HOOK small guide pieces are welded at two ends of the pattern pieces and the strip pieces.
The thickness of the piece to be welded shown in fig. 1 is only 0.3mm, while the size of the small guide piece is generally 0.8mm by 1.0mm, or even smaller; therefore, when the small guide piece and the to-be-welded piece are welded, the welding is required to be carried out within the range of 0.8mm by 1.0mm, so that the welding area of the to-be-welded piece and the small guide piece is very small, the welding part of the to-be-welded piece and the small guide piece is easy to deform after being heated, the deformation of the welding part is larger than 0.15mm required by welding deformation, and burrs are easy to be generated on the to-be-welded piece and the small guide piece; meanwhile, the welding strength of the folding screen is difficult to meet the requirement of 15N thrust, so that the parts to be welded and the small guide parts are easy to fall off, and the service life of the whole folding screen is influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a welding process of a folding screen assembly, which aims at solving the problems that the welding area between a small guide piece and a piece to be welded is small, and the false welding, burrs and deformation are easy to generate.
In order to achieve the above object, the basic scheme of the present invention is as follows: a welding process for a folding screen assembly, comprising the steps of:
step S1: preparing a fiber laser, a focusing lens and a welding jig for compacting the small guide piece and the piece to be welded;
step S2: the small guide piece and the piece to be welded are installed on a welding jig in a pressure equalizing manner, and the first welding surface of the small guide piece and the second welding surface of the piece to be welded are pressed and attached;
step S3: setting the laser energy of the fiber laser to be 0.80J-0.92J, and focusing the laser by a focusing lens to form a focus, wherein the focus position moves by 1.2-1.4mm towards the side close to the workpiece to be welded by taking the side of the workpiece to be welded away from the second welding surface as a reference surface;
step S4: starting the optical fiber laser to emit laser, sequentially welding 2-6 times at the first welding surface and the second welding surface to sequentially form a welding point A, a welding point B, a welding point E and a welding point F, wherein the welding point A and the welding point C are sequentially positioned on one side of a part to be welded, which is close to the center, the welding point D and the welding point B are sequentially positioned on one side of the part to be welded, which is far from the center, and the welding point E and the welding point F are positioned among the welding point A, the welding point B, the welding point C and the welding point D.
The technical principle of the invention is as follows: in the step S2, the welding jig can be used for fixing and limiting the small guide piece and the piece to be welded, so that preparation is made for subsequent welding, the precision of the joint position of the small guide piece and the piece to be welded is improved, and the subsequent welding precision can also be improved; in the step S3, the optical fiber laser is matched with the focusing lens, so that the position of a focus can be effectively controlled, the welding range and the welding height of the small guide piece and the piece to be welded are conveniently controlled, and the small guide piece and the piece to be welded can pass through the piece to be welded and then act on the first welding surface and the second welding surface; in the step S4, the welding sequence and the welding positions of the welding points A, B, E and F are limited, so that the welding points A and B are arranged in a crossing way, the welding points C and D are also arranged in a crossing way, when the welding point A is welded, energy and stress can be diffused to the edge of a piece to be welded, after rapid cooling and solidification, the welding point B is subjected to crossing welding treatment, the welding point B can be overlapped with the welding point A in a smaller way, the phenomenon that the energy and the stress are excessively gathered between the welding points B is avoided, and the welding sequence of the welding points C and D can be matched with the welding points A and B, so that the same effect is achieved; the welding points E and F can complement the range between the welding points A, B, C and D.
Therefore, the welding energy, the welding height, the welding spot size and the welding spot mode are adjusted to realize that the surface of a welded product is burr-free and deformation-free, the welding strength is more than 15N thrust, and the welding of the small guide piece and the piece to be welded can be efficiently and accurately completed.
Further, in step S4, the first welding surface and the second welding surface are welded for 4 times in sequence, so as to form a welding point a, a welding point B, a welding point C and a welding point D in sequence, the welding point a and the welding point C are located at one side of the piece to be welded close to the center, the welding point B and the welding point D are located at one side of the piece to be welded far from the center, the welding point a and the welding point B are arranged diagonally, and the welding point C and the welding point D are arranged diagonally.
Through the arrangement, the four welding points can cover the first welding surface and the second welding surface with smaller areas, so that the welding efficiency is guaranteed, no cold welding is guaranteed between the first welding surface and the second welding surface, the area overlapping ratio among the welding points A, B, C and D is low, a large amount of energy and stress are prevented from being accumulated at the overlapping positions of the welding points A, B, C and D, and the welding between the first welding surface and the second welding surface is smooth and stable.
Further, in step S3, the focal position is moved by 1.25-1.35mm toward the side close to the workpiece to be welded with the side of the workpiece to be welded away from the second welding surface as the reference surface.
Through the arrangement, the selection of the focus position can avoid too much concentration of energy on the surface of the workpiece to be welded, can also prevent the phenomenon of vaporization and splashing of partial ions on the surface of the workpiece to be welded, can generate dents and burrs, and can also reduce the deformation and warping phenomena of the workpiece to be welded; meanwhile, the conditions of cold joint and unstable thrust between the piece to be welded and the small guide piece are avoided.
Further, in step S3, the laser energy of the fiber laser is 0.81J to 0.91J.
Through the arrangement, the laser energy of the fiber laser is more accurate to select, and deformation and burrs can be avoided while welding stability is guaranteed.
In step S1, the welding fixture includes a base, an installation template for installing the workpiece to be welded, a compressing unit capable of compressing the workpiece to be welded, and a limiting seat for limiting the small guide, wherein the limiting seat and the installation template are detachably installed on the base; one side of the limiting seat is provided with a plurality of guide holes for horizontally inserting one end of the small guide piece, the other side of the limiting seat is provided with a plurality of vertical through grooves for embedding the other end of the small guide piece and the end of the piece to be welded, the vertical through grooves are in one-to-one correspondence with the guide holes, and the vertical through grooves are communicated with the guide holes to form profiling grooves for accommodating the small guide piece.
Through the arrangement, before the small guide pieces and the to-be-welded pieces are welded, the small guide pieces are installed in the profiling grooves one by one, at the moment, one cylindrical end of each small guide piece is horizontally inserted into the guide hole, the upper ends of the small guide pieces are also embedded into the vertical through grooves, the lower sides of the small guide pieces are propped against the bottoms of the vertical through grooves, the preliminary installation and limiting of a plurality of small guide pieces can be completed, and the limiting efficiency and limiting precision of the small guide pieces can be improved through the arrangement of the profiling grooves; then will wait to weld the piece and place the installation template on, wait to weld the tip department one by one of piece and laminate to the upper surface department of little guide at this moment, then compress tightly and wait to weld the piece, can carry out laser welding to the coincidence of little guide and waiting to weld the piece through vertical through groove department, under the circumstances that little guide spacing precision promoted, can effectively promote little guide and wait to weld the welding precision of piece.
Further, the welding device further comprises a stop block, the stop block is arranged between the limiting seat and the mounting template, the upper side of the stop block can abut against the lower surface of the piece to be welded and can be coplanar with the upper side of the small guide piece, and one side, close to the limiting block, of the stop block can abut against the end part of the small guide piece.
Through the arrangement, after the small guide pieces are placed in the corresponding profiling grooves one by one, the check blocks are arranged between the limit seats and the mounting templates, and the check blocks can be stably matched with the limit seats, so that the end parts of the small guide pieces are also propped against the side walls of the check blocks; under the cooperation of dog and spacing seat, five faces of little guide are all spacing, improve little guide's installation accuracy and spacing precision.
Further, be provided with the magnetic path that can attract the dog on the limit seat, be equipped with the first magnetism that supplies magnetic path demountable installation on the limit seat one side that is close to the dog and inhale the hole, be equipped with the second magnetism that supplies the tip embedding of magnetic path on the dog and inhale the hole.
Through above-mentioned setting, inhale the hole setting through first magnetism and second magnetism, improve the cooperation precision of dog and spacing seat, avoid the vertical position and the horizontal position of dog to produce the error.
Further, the compressing unit comprises a compressing plate capable of compressing or loosening the mounting template and the piece to be welded, a compressing adjusting rod is mounted on the compressing plate, the middle of the compressing adjusting rod is connected with the base, and a compressing locking part is mounted between the compressing adjusting rod and the base.
The position of the pressing plate is controlled and the pressing force between the pressing plate and the piece to be welded is also controlled through the arrangement of the pressing adjusting rod and the pressing locking part; under the effect of the compacting plate, the workpiece to be welded is also enabled to maintain a state with accurate relative positions when being welded with the small guide piece, and the welding precision is improved.
Further, a compression adjusting rod is arranged on the compression plate, an adjusting threaded column is vertically and fixedly arranged on the upper surface of the compression plate, two adjusting bolts are arranged at the upper end of the adjusting threaded column, two gaskets are coaxially arranged between the two adjusting bolts, and a flange which is bent towards the center of the adjusting threaded column is arranged at the edge of each single gasket; the compressing and locking part is a hinge four-bar mechanism, the hinge four-bar mechanism comprises a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod, wherein the first connecting rod, the second connecting rod and the third connecting rod are sequentially hinged, the third connecting rod and the fourth connecting rod are fixedly connected with the compressing and adjusting device, the first connecting rod is horizontally arranged, the lower side of the first connecting rod is provided with a fixing seat which is detachably connected with the base, and one side, away from the third connecting rod, of the second connecting rod is integrally formed with a shifting fork which can be embedded between two gasket flanges.
Through adjusting screw thread post, adjusting bolt, gasket, flange and shift fork's cooperation, the rotation pitch arc of control pressure strip and bed course, and then can compress tightly the welding to the waiting of different length specifications, improves the adaptability that whole tool used.
Further, a guide column is vertically and fixedly arranged on the base, the upper end of the guide column is hemispherical, a guide hole for embedding the guide column is formed in the pressing plate, and the guide column is located in the guide hole when the pressing plate presses the upper surface of the piece to be welded.
Through above-mentioned setting, through the cooperation of guiding hole and guide post, let bed course and pressure strip can remove corresponding position when rotating, improve the pressure strip and the bed course and the accuracy when treating the weldment and compressing tightly.
Drawings
Fig. 1 is a partial schematic view of a welded part of a small guide member and a member to be welded in the prior art.
Fig. 2 is a flowchart illustrating an operation of a welding process of a folding screen assembly according to embodiment 1 of the present invention.
Fig. 3 is a schematic structural diagram of a welding point sequence in a welding process of a folding screen assembly according to embodiment 1 of the present invention.
Fig. 4 is an axial schematic diagram of a welding jig according to embodiment 1 of the present invention.
Fig. 5 is a top view of the welding jig in embodiment 1 of the present invention.
Fig. 6 is an enlarged view of the left side cross-section at A-A in fig. 5.
Fig. 7 is an enlarged view of the limit seat and the stopper.
Fig. 8 is a bottom view of fig. 5.
In the above figures: to-be-welded part 1, small guide part 2, welding point A3, welding point B4, welding point C5, welding point D6, base 30, first mounting hole 301, third mounting hole 301, guide post 303, mounting template 40, limit seat 50, fourth mounting hole 501, guide hole 502, vertical through groove 503, profiling groove 504, first magnetic attraction hole 505, magnetic block 60, stopper 70, second magnetic attraction hole 701, pressing plate 80, cushion layer 801, guide hole 802, pressing adjustment rod 803, adjustment screw post 804, adjustment bolt 805, gasket 806, flange 807, first link 808, fixing base 818, second link 809, third link 810, fourth link 811, and handle 812.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.
Example 1
The embodiment of the invention provides a welding process of a folding screen assembly, which is basically shown in fig. 2-8, and specifically comprises the following steps:
step S1: preparing a fiber laser, a focusing lens and a welding jig for compacting the small guide piece 2 and the piece 1 to be welded; the optical fiber laser is a 20um fiber core optical fiber laser, and the focusing lens is a focusing lens with a focal length of 150 mm; meanwhile, the welding jig comprises a base 30, an installation template 40 for installing a piece 1 to be welded, two compression units, two limiting seats 50 for limiting the small guide piece 2 and two stop blocks 70 which are in one-to-one correspondence with the limiting seats 50, wherein the two compression units and the two limiting seats 50 are symmetrically arranged along the vertical central plane of the base 30; as shown in fig. 8, four first mounting holes 301 are uniformly formed in the base 30, four second mounting holes which can be communicated with the first mounting holes 301 are formed in the bottom surface of the mounting template 40, and the first mounting holes 301 and the second mounting holes are detachably connected through bolts; four third mounting holes 301 are formed in the upper surface of the base 30, the third mounting holes 301 are counter bores, two fourth mounting holes 501 which can be communicated with the third mounting holes 301 are vertically formed in the limiting seat 50, and the third mounting holes 301 and the fourth mounting holes 501 are detachably connected through bolts;
as shown in fig. 6 and 7, a plurality of guide holes 502 for horizontally inserting one end of the small guide piece 2 are formed on the left side of the limiting seat 50, a plurality of vertical through grooves 503 for embedding the other end of the small guide piece 2 and the end of the piece 1 to be welded are formed on the right side of the limiting seat 50, the vertical through grooves 503 are in one-to-one correspondence with the guide holes 502, and the vertical through grooves 503 are communicated with the guide holes 502 to form profiling grooves 504 for accommodating the small guide piece 2;
as shown in fig. 6 and 7, a stopper 70 is installed between the limit seat 50 and the installation template 40, the upper side of the stopper 70 may abut against the lower surface of the piece to be welded 1 and may be coplanar with the upper side of the small guide 2, the lower side of the stopper 70 may abut against the upper surface of the base 30, and the left side of the stopper 70 may abut against the end of the small guide 2; meanwhile, a magnetic block 60 capable of attracting a stop block 70 is arranged on the limit seat 50, a first magnetic attraction hole 505 for embedding the end part of the magnetic block 60 is arranged on the right side of the limit seat 50, and a second magnetic attraction hole 701 for embedding the end part of the magnetic block 60 is arranged on the stop block 70;
as shown in fig. 4, the compressing unit comprises a compressing plate 80 capable of compressing or loosening the mounting template 40 and the piece 1 to be welded, a compressing adjusting rod 803 is mounted on the compressing plate 80, an adjusting threaded column 804 is vertically and fixedly mounted on the upper surface of the compressing plate 80, two adjusting bolts 805 are mounted at the upper end of the adjusting threaded column 804, two gaskets 806 are coaxially arranged between the two adjusting bolts 805, and a flange 807 bending towards the center of the adjusting threaded column 804 is arranged at the edge of the single gasket 806; the middle part of the compression adjusting rod 803 is connected with the base 30, a compression locking part is arranged between the compression adjusting rod 803 and the base 30, the compression locking part is a hinge four-bar mechanism, the hinge four-bar mechanism comprises a first connecting rod 808, a second connecting rod 809, a third connecting rod 810 and a fourth connecting rod 811 which are sequentially hinged, the third connecting rod 810 and the fourth connecting rod 811 are integrally formed with the compression adjusting rod 803, the first connecting rod 808 is horizontally arranged, a fixed seat 818 connected with the base 30 through bolts is arranged on the lower side of the first connecting rod 808, and a shifting fork which can be embedded between flanges 807 of two gaskets 806 is integrally formed on one side of the second connecting rod 809 away from the third connecting rod 810; a handle 812 is fixedly arranged on the left end of the pressing adjusting rod 803; when the second link 809 rotates to the vertical state, the hinge four-bar mechanism is locked, the lower surface of the pressing plate 80 is opposite to the upper side of the stopper 70, and one side wall of the pressing plate 80 can be attached to the side wall of the limit seat 50;
in addition, as shown in fig. 6, a cushion layer 801 is fixedly installed on the lower surface of the compacting plate 80 in a covering manner, and the cushion layer 801 can be abutted against the upper surface of the piece 1 to be welded; as shown in fig. 4 and 6, a guide post 303 is vertically and fixedly installed on a base 30, guide holes 802 into which the guide post 303 is inserted are formed in both a pressing plate 80 and a cushion layer 801, when the pressing plate 80 and the cushion layer 801 press the upper surface of a piece 1 to be welded, the guide post 303 is positioned in the guide holes 802, and the upper end of the guide post 303 is hemispherical, so that when the guide post 303 is inserted into the guide holes 802, the guide post 303 is in smooth contact with the guide holes 802;
step S2: when the small guide piece 2 and the piece 1 to be welded are installed on a welding jig in a pressure equalizing manner, the handle 812 is held firstly to loosen the pressing plate 80 and the cushion layer 801 on the installation template 40, the pressing adjusting rod 803 drives the hinge type connecting rod mechanism to deform, and then the second connecting rod 809 is lifted, so that the pressing plate 80 and the cushion layer 801 are separated from the installation template 40; then installing the small guide pieces 2 into the profiling grooves 504 one by one, at this time, one cylindrical end of each small guide piece 2 is horizontally inserted into the guide hole 502, the upper end of each small guide piece 2 is also embedded into the vertical through groove 503, and the lower side of each small guide piece 2 abuts against the bottom of the vertical through groove 503, so that the preliminary installation and limiting of a plurality of small guide pieces 2 can be completed; then, the second magnetic attraction holes 701 on the stop block 70 are opposite to the first magnetic attraction holes 505 on the limit seat 50, the magnetic blocks 60 are embedded into the second magnetic attraction holes 701, and the magnetic blocks 60 attract the stop block 70 at the same time, so that the stop block 70 and the limit seat 50 can be stably matched, and the end part of the small guide piece 2 is also propped against the side wall of the stop block 70; under the cooperation of the stop block 70 and the limiting seat 50, the five surfaces of the small guide piece 2 are limited, so that the installation precision and the limiting precision of the small guide piece 2 are improved;
then placing the to-be-welded pieces 1 on the mounting template 40, wherein the end parts of the to-be-welded pieces 1 are attached to the upper surfaces of the small guide pieces 2 one by one, and the lower surfaces of the to-be-welded pieces 1 are attached to the upper surfaces of the stop blocks 70, so that the relative precision of the to-be-welded pieces 1 and the small guide pieces 2 is improved; then, the handle 812 is held to drive the pressing adjusting rod 803, the pressing adjusting rod 803 pushes the second connecting rod 809 to rotate relative to the third connecting rod 810 and the second connecting rod 809, and then the second connecting rod 809 is driven to rotate to a vertical state, the pressing plate 80 and the cushion layer 801 are pushed to be pressed onto the piece 1 to be welded, the side walls of the pressing plate 80 and the cushion layer 801 are abutted against the side walls of the limiting seat 50, and the bonding position of the small guide piece 2 and the piece 1 to be welded is not blocked while the small guide piece 2 is pressed against the piece 1 to be welded;
step S3: setting the laser energy of the fiber laser to be 0.86J, focusing the laser by a focusing lens to form a focus, moving the focus position by 1.3mm towards the side close to the workpiece 1 by taking the side of the workpiece 1 far away from the second welding surface as a reference surface, and vertically opposite to the end part of the workpiece 1;
step S4: starting the optical fiber laser to emit laser, sequentially welding 4 times at the first welding surface and the second welding surface, sequentially forming a welding point A3, a welding point B4, a welding point C5 and a welding point D6, wherein the welding point A3 and the welding point C5 are positioned on one side of the to-be-welded piece 1 close to the center, the welding point B4 and the welding point D6 are positioned on one side of the to-be-welded piece 1 away from the center, the welding point A3 and the welding point B4 are arranged in a diagonal manner, and the welding point C5 and the welding point D6 are arranged in a diagonal manner.
Comparative example 2
Comparative example 2 is different from example 1 in that steps S1, S2, S3 and S4 are employed, but in step S3, the laser energy of the fiber laser is 0.93J energy.
Comparative example 3
Comparative example 3 is different from example 1 in that steps S1, S2, S3 and S4 are employed, but in step S3, the laser energy of the fiber laser is 0.79J energy.
Comparative example 4
Comparative example 4 is different from example 1 in that the steps S1, S2, S3 and S4 are adopted, but in step S3, the focal position is moved by 0.8mm toward the side close to the workpiece with reference to the side of the workpiece far from the second welding surface.
Comparative example 5
Comparative example 5 is different from example 1 in that steps S1, S2, S3 and S4 are employed, but in step S3, the focal position is moved by 2.0mm toward the side close to the workpiece with reference to the side of the workpiece far from the second welding surface.
Comparative example 6
Comparative example 6 is different from example 1 in that the steps S1, S2, S3 and S4 are adopted, but in step S4, the welding point A1, the welding point B1 and the welding point C1 are sequentially formed at the first welding face and the second welding face, the welding point A1 is located on the side of the member to be welded close to the center, the welding point B1 and the welding point C1 are located on the side of the member to be welded away from the center, and the welding points a, B and C are arranged in an equilateral triangle.
Comparative example 7
Comparative example 7 is different from example 1 in that the steps S1, S2, S3 and S4 are adopted, welding point A2, welding point B2, welding point C2 and welding point D2 are formed in order at the first welding surface and the second welding surface in order, the welding point A2 and the welding point B2 are located on the side of the piece to be welded away from the center, the welding point C2 and the welding point D2 are located on the side of the piece to be welded close to the center, and the welding point A2 is disposed diagonally to the welding point D2, and the welding point C2 is disposed diagonally to the welding point B2.
According to the process of example 1 and comparative examples 2 to 7, the small guide piece and the piece to be welded shown in fig. 1 of specification and model are welded in sequence to form a product a, a product B, a product C, a product D, a product E, a product F and a product G in sequence, and then the quality of the product a, the product B, the product C, the product D, the product E, the product F and the product G is detected from four dimensions of burrs, deformation, thrust and yellowing, so as to obtain the detection data conditions of table 1:
| sequence number | Burrs (burrs) | Deformation of | Thrust (N) | Yellowing of |
| Product A | OK | OK | 20 | OK |
| Product B | OK | NG | 22 | NG |
| Product C | OK | OK | 13 | OK |
| Product D | NG | NG | 19 | OK |
| Product E | NG | OK | 12 | OK |
| Product F | OK | OK | 10 | OK |
| Product G | OK | NG | 20 | NG |
TABLE 1
As can be seen from the data in table 1, the product a welded by the process of example 1 meets the standards in terms of burrs, deformation, thrust and yellowing; the product B welded by the process in the comparative example 2 has local yellowing on the surface of the product B and deformation warping phenomenon, and does not meet the product standard because the laser energy reaches 0.93J; the product C welded by the process in the comparative example 3 cannot reach 15N due to the fact that the laser energy is only 0.79J; the product D welded by the process in comparative example 4 has the problems that the surface of the workpiece to be welded is partially gasified and splashed due to too much energy concentrated on the surface of the workpiece to be welded, dents and burrs are formed on the surface, and deformation and warping are caused; the product E is welded by adopting the process in the comparative example 5, and during welding, a light spot of a focal point of laser on the surface of a piece to be welded is increased, and the light spot has a risk of exceeding the surface of the end part of the piece to be welded, so that cold welding occurs, and the thrust of the product E is unstable; the product F welded by the process in the comparative example 6 is easy to cause that the welding parts of the piece to be welded and the small guide piece cannot be covered completely among the welding points A1, B1 and C1 due to the reduction of the number of the welding points, and the phenomenon that the reasoning of the product F cannot meet 15N can occur; the welding position sequence of the welding point A2, the welding point B2, the welding point C2 and the welding point D2 in the comparative example 7 is different from that in the embodiment 1, and the part to be welded is firstly welded on one side far away from the center, so that deformation generated when the part to be welded is welded at the edge of the part to be welded is spread to one side close to the center, and the part of stress and capacity are excessively accumulated in one direction, so that the product E is deformed.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (10)
1. A welding process for a folding screen assembly, comprising the steps of:
step S1: preparing a fiber laser, a focusing lens and a welding jig for compacting the small guide piece and the piece to be welded;
step S2: the small guide piece and the piece to be welded are installed on a welding jig in a pressure equalizing manner, and the first welding surface of the small guide piece and the second welding surface of the piece to be welded are pressed and attached;
step S3: setting the laser energy of the fiber laser to be 0.80J-0.92J, and focusing the laser by a focusing lens to form a focus, wherein the focus position moves by 1.2-1.4mm towards the side close to the workpiece to be welded by taking the side of the workpiece to be welded away from the second welding surface as a reference surface;
step S4: starting the optical fiber laser to emit laser, sequentially welding 2-6 times at the first welding surface and the second welding surface to sequentially form a welding point A, a welding point B, a welding point E and a welding point F, wherein the welding point A and the welding point C are sequentially positioned on one side of a part to be welded, which is close to the center, the welding point D and the welding point B are sequentially positioned on one side of the part to be welded, which is far from the center, and the welding point E and the welding point F are positioned among the welding point A, the welding point B, the welding point C and the welding point D.
2. The welding process of a folding screen assembly according to claim 1, wherein in the step S4, the first welding surface and the second welding surface are welded in sequence for 4 times, and the welding point a, the welding point B, the welding point C and the welding point D are formed in sequence, the welding point a and the welding point C are located on a side of the piece to be welded close to the center, the welding point B and the welding point D are located on a side of the piece to be welded away from the center, the welding point a is disposed diagonally to the welding point B, and the welding point C is disposed diagonally to the welding point D.
3. A welding process for a folding screen assembly according to claim 1, wherein in step S3, the focal position is moved by 1.25-1.35mm with respect to the side of the member to be welded away from the second welding surface, toward the side of the member to be welded.
4. A folding screen assembly welding process as claimed in claim 1, wherein in step S3, the laser energy of the fiber laser is 0.81J-0.91J.
5. The welding process of the folding screen assembly according to claims 1 to 4, wherein in the step S1, the welding jig comprises a base, an installation template for installing the piece to be welded, a pressing unit capable of pressing the piece to be welded, and a limiting seat for limiting the small guide piece, wherein the limiting seat and the installation template are detachably installed on the base; the device is characterized in that a plurality of guide holes for horizontally inserting one end of the small guide piece are formed in one side of the limiting seat, a plurality of vertical through grooves for embedding the other end of the small guide piece and the end of the piece to be welded are formed in the other side of the limiting seat, the vertical through grooves correspond to the guide holes one by one, and the vertical through grooves are communicated with the guide holes to form profiling grooves for accommodating the small guide piece.
6. The welding process of a folding screen assembly according to claim 5, further comprising a stopper installed between the limit seat and the installation template, wherein an upper side of the stopper can abut against a lower surface of the member to be welded and can be coplanar with an upper side of the small guide, and a side of the stopper adjacent to the limit stopper can abut against an end of the small guide.
7. The welding process of a folding screen assembly according to claim 6, wherein the limit seat is provided with a magnetic block capable of attracting the block, a first magnetic attraction hole for detachably installing the magnetic block is formed on one side, close to the block, of the limit seat, and a second magnetic attraction hole for embedding the end part of the magnetic block is formed on the block.
8. The welding process of a folding screen assembly according to claim 7, wherein the compressing unit comprises a compressing plate capable of compressing or loosening the mounting template and the piece to be welded, a compressing adjusting rod is mounted on the compressing plate, the middle part of the compressing adjusting rod is connected with the base, and a compressing locking part is mounted between the compressing adjusting rod and the base.
9. The welding process of a folding screen assembly according to claim 8, wherein a compression adjusting rod is installed on the compression plate, an adjusting threaded column is vertically and fixedly installed on the upper surface of the compression plate, two adjusting bolts are installed at the upper end of the adjusting threaded column, two gaskets are coaxially arranged between the two adjusting bolts, and a flange bent towards the center of the adjusting threaded column is arranged at the edge of a single gasket; the pressing locking part is a hinge four-bar mechanism, the hinge four-bar mechanism comprises a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod, the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod are hinged in sequence, the third connecting rod and the fourth connecting rod are fixedly connected in a pressing mode, the first connecting rod is horizontally arranged, the lower side of the first connecting rod is provided with a fixing seat which is detachably connected with the base, and one side, away from the third connecting rod, of the second connecting rod is integrally formed with a shifting fork which can be embedded between two gasket flanges.
10. The welding process of a folding screen assembly according to claim 9, wherein the guide post is vertically and fixedly installed on the base, the upper end of the guide post is hemispherical, the pressing plate is provided with a guide hole into which the guide post is inserted, and the guide post is positioned in the guide hole when the pressing plate presses the upper surface of the piece to be welded.
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