Laser welding equipment, positioning device and laser welding process

Abstract

The invention discloses laser welding equipment, a positioning device and a laser welding process, and relates to the technical field of welding machines.The laser welding equipment comprises a conveying device, a welding device, a transferring device and the positioning device, and the conveying device comprises a feeding end, a discharging end and a transferring area located between the feeding end and the discharging end; the welding device is adjacent to the conveying device and is provided with a welding operation area; the transfer device is arranged above the conveying device and used for carrying the first workpiece between the transfer area and the welding operation area. The positioning device is arranged in a welding operation area of the welding device and is used for bearing the first workpiece which is magnetically attracted and positioned and is carried by the transfer device and the second workpiece which is stacked above the first workpiece; the welding device is used for welding the first workpiece and the second workpiece which are magnetically attracted and positioned on the positioning device; according to the technical scheme provided by the invention, the first workpiece and the second workpiece can be quickly positioned and fixed, so that the working efficiency of the laser welding equipment is improved.

Description

Technical Field

[0001] The invention relates to the technical field of welding processing, and in particular to a laser welding device, a positioning device and a laser welding process. Background Art

[0002] In the prior art, in order to facilitate the welding process of thin sheet metal parts, laser welding technology is used. In order to prevent deviations during welding, in the prior art, a clamping tool is used to position the workpiece during laser welding. Currently, when two workpieces need to be overlapped and welded, a clamping tool needs to be used to position the two workpieces respectively, which makes the clamping operation steps cumbersome, thereby reducing the overall working efficiency of the equipment. Summary of the invention

[0003] The main purpose of the present invention is to provide a laser welding device, a positioning device and a laser welding process, aiming to solve the problem that the existing clamping tooling is inconvenient to position and clamp the workpiece.

[0004] To achieve the above object, the present invention provides a laser welding device, comprising:

[0005] A conveying device, comprising a loading end, a unloading end and a transfer area between the loading end and the unloading end, wherein the conveying device is used to sequentially convey the first workpiece from the loading end to the transfer area and the unloading end;

[0006] A welding device is arranged adjacent to the conveying device and between the loading end and the unloading end, and the welding device has a welding operation area;

[0007] A transfer device, disposed above the conveying device, the transfer device being used to transfer the first workpiece between the transfer area and the welding operation area; and

[0008] A positioning device is provided in the welding operation area of ​​the welding device; the positioning device is used to carry the first workpiece transported by the transfer device and the second workpiece stacked on the first workpiece, and is also used to magnetically position the first workpiece and the second workpiece;

[0009] The welding device is used to weld the first workpiece and the second workpiece which are magnetically positioned on the positioning device.

[0010] In one embodiment, the positioning device includes a support member and an electromagnetic platform disposed on the support member.

[0011] In one embodiment, the electromagnetic platform includes a metal block and a plurality of coils wound around the outer circumference of the metal block, wherein the plurality of coils are arranged at intervals along the length direction of the metal block, and the interval between adjacent coils is D1;

[0012] The width of the second workpiece is D2, and D1 is not greater than 0.5*D2.

[0013] In one embodiment, the metal block is provided with a mounting hole, the diameter of the mounting hole is D3, and D3 is smaller than D1. The mounting hole is used for assembly and disassembly of external tooling.

[0014] In one embodiment, a positioning portion is protruded from a surface of the metal block facing away from the support member, and the positioning portion is used to limit the position of the first workpiece;

[0015] And / or, the positioning portion includes a first connecting segment and a second connecting segment connected to each other, and a connection between the first connecting segment and the second connecting segment is bent.

[0016] In one embodiment, the positioning devices include at least two, and the two positioning devices are arranged at intervals along the direction from the loading end to the unloading end of the conveying device.

[0017] In one embodiment, the transfer device includes a support frame, a sliding assembly and a grabbing assembly. The support frame is arranged outside the welding work area, the sliding assembly can be slidably arranged on the support frame, and the grabbing assembly is arranged on the sliding assembly. The sliding assembly is used to drive the grabbing assembly to move so as to drive the grabbing assembly to grab the first workpiece and / or the second workpiece.

[0018] In one embodiment, the grabbing assembly includes a mounting bracket and a grabbing member, wherein the grabbing member is disposed on the mounting bracket and extends downward, and the grabbing member includes an electromagnetic magnetic suction head, and the electromagnetic magnetic suction head is used to magnetically grab the first workpiece and / or the second workpiece.

[0019] In one embodiment, the number of the grabbing components is multiple;

[0020] Each of the grabbing assemblies is also provided with a driving member, the driving member is provided on the mounting bracket, the grabbing member is provided on the driving member, and the driving member is used to drive the grabbing member to move so that each of the grabbing assemblies fits the first workpiece and / or the second workpiece.

[0021] In one embodiment, the sliding assembly includes a lifting member and a translation member, the lifting member is slidably disposed on the support frame, the translation member is slidably disposed on the lifting member, the grabbing assembly is disposed on the translation member, the lifting member drives the translation member and the grabbing assembly to slide in the up and down directions, and the translation member drives the grabbing assembly to slide in the left and right directions.

[0022] In one embodiment, the laser welding equipment further includes a control device, and the control device is communicatively connected to the conveying device, the welding device, the transfer device and the positioning device respectively.

[0023] In one embodiment, a camera and a line laser scanner are provided above the positioning device, and both the camera and the line laser scanner are communicatively connected to the control device to provide the control device with positioning information of the positioning device for the first workpiece and the second workpiece.

[0024] In one embodiment, when the control device controls the positioning device to operate, the magnetic attraction force of the metal block of the positioning device is not less than 120N / cm3.

[0025] In one embodiment, the welding device includes a slide rail and a mechanical welding arm, the slide rail is arranged between the conveying device and the positioning device, the control device is communicatively connected with the mechanical welding arm, and the control device is used to control the mechanical welding wall to slide on the slide rail.

[0026] In one embodiment, the stacked thickness of the first workpiece and / or the second workpiece is no more than 3 mm.

[0027] The present invention also provides a positioning device, comprising:

[0028] Supports;

[0029] An electromagnetic platform is arranged above the support member, and comprises a metal block and a plurality of coils wound around the outer circumference of the metal block. Each of the coils has a power-on state and a power-off state. In the power-on state, the metal block has a magnetic attraction to magnetically position the workpiece.

[0030] The present invention also provides a laser welding process, comprising:

[0031] Loading the first workpiece from the loading end onto the conveying device;

[0032] When the first workpiece moves to the transfer area of ​​the conveying device, the transfer device transfers the first workpiece to the positioning device;

[0033] When the first workpiece is placed on the positioning device, the second workpiece can be placed on the preset position of the first workpiece in a stacked manner, and the positioning device is turned on to allow the positioning device to magnetically position the first workpiece and the second workpiece located above the first workpiece;

[0034] When the positioning is completed, the welding device welds the first workpiece and the second workpiece;

[0035] After welding is completed, the transfer device transfers the welded first workpiece and the second workpiece to the conveying device, and conveys them to the unloading area through the conveying device.

[0036] In one embodiment, when the welding device welds the first workpiece and the second workpiece, a preset protection time is referred to, and the preset protection time is not greater than the time it takes for the welding device to penetrate the thickness of the first workpiece or the second workpiece at the same working power.

[0037] The technical solution of the present invention is arranged in such a way that when the first workpiece and the second workpiece are overlap-welded, the first workpiece and the second workpiece stacked on the first workpiece can be quickly positioned at the same time by the positioning device, so that the welding device can easily perform welding operations on the two, and after the welding is completed, the welded product can also be quickly removed. In this way, the overall working efficiency of the laser welding equipment can be improved by quickly positioning the first workpiece and the second workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0039] Figure 1 A schematic structural diagram of an embodiment of a laser welding device provided by the present invention;

[0040] Figure 2 A schematic structural diagram of an embodiment of a positioning device provided by the present invention;

[0041] Figure 3 A schematic structural diagram of another embodiment of the positioning device provided by the present invention;

[0042] Figure 4 A schematic diagram of the structure of the transfer device provided by the present invention;

[0043] Figure 5 for Figure 4 The enlarged structural diagram at A in the middle;

[0044] Figure 6 for Figure 1 Schematic diagram of the structure with removal of the transfer device;

[0045] Figure 7 for Figure 1 A schematic diagram of the structure without the transfer device and the positioning device;

[0046] Figure 8 This is a schematic diagram of the laser welding process provided by the present invention.

[0047] Description of Figure Numbers:

[0048] 10. Laser welding equipment; 20. Conveying device; 21. Loading end; 22. Transfer area; 23. Unloading end; 30. Welding device; 31. Mechanical welding arm; 32. Slide rail; 40. Transfer device; 41. Support frame; 42. Sliding assembly; 421. Lifting member; 422. Translation member; 43. Grabbing assembly; 431. Mounting bracket; 432. Grabbing member; 4321. Electromagnetic magnetic suction head; 433. Driving member; 50. Positioning device; 51. Support member; 52. Electromagnetic platform; 521. Metal block; 522. Coil; 523. Mounting hole; 524. Positioning portion; 5241. First connecting section; 5242. Second connecting section; 60. First workpiece; 70. Second workpiece.

[0049] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0052] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0053] In the prior art, in order to facilitate the welding process of thin sheet metal parts, laser welding technology is used. In order to prevent deviations during welding, in the prior art, a clamping tool is used to position the workpiece during laser welding. Currently, when two workpieces need to be overlapped and welded, a clamping tool needs to be used to position the two workpieces separately, which makes the clamping operation steps cumbersome.

[0054] The present invention provides a laser welding device 10 .

[0055] See also Figure 1 As shown, in one embodiment of the present invention, the laser welding equipment 10 includes a conveying device 20, a welding device 30, a transfer device 40 and a positioning device 50, wherein the conveying device 20 includes a loading end 21, a unloading end 23 and a transfer area 22 located between the loading end 21 and the unloading end 23, and the conveying device 20 is used to convey the first workpiece 60 from the loading end 21 to the transfer area 22 and the unloading end 23 in sequence; the welding device 30 is arranged adjacent to the conveying device 20 and is arranged between the loading end 21 and the unloading end 23, and the welding device 30 has a welding operation area; the transfer device 40 is provided Above the conveying device 20, the transfer device 40 is used to transport the first workpiece 60 between the transfer area 22 and the welding work area; and the positioning device 50 is arranged in the welding work area of ​​the welding device 30; the positioning device 50 is used to carry the first workpiece 60 transported by the transfer device 40 and the second workpiece 70 stacked on the first workpiece 60, and is also used to magnetically position the first workpiece 60 and the second workpiece 70; the welding device 30 is used to weld the first workpiece 60 and the second workpiece 70 magnetically positioned on the positioning device 50.

[0056] The technical solution of the present invention is to enable laser teaching-free welding of thinner sheet metal parts. In this embodiment, the laser welding equipment 10 includes a conveying device 20, a transfer device 40, a welding device 30 and a positioning device 50, wherein the conveying device 20 is mainly used to convey the first workpiece 60 that needs to be welded. In this embodiment, the conveying device 20 includes a loading end 21, a transfer area 22 and a unloading end 23. When the laser welding equipment 10 is in operation, the first workpiece 60 is loaded onto the conveying device 20 from the loading end 21, and then the conveying device 20 conveys the first workpiece 60 to the transfer area 22. After the first workpiece 60 moves to the transfer area 22, the transfer device 40 will transport the first workpiece 60 from the transfer area 22 to the positioning device 50. After the first workpiece 60 is transported to the positioning device 50, the second workpiece 70 can be placed on the first workpiece 60 in a stacked manner. After placement, the positioning device 50 is turned on. When the positioning device 50 is turned on, the first workpiece 60 and the second workpiece 70 are magnetically positioned to facilitate the welding device 30 to position the second workpiece 70. A workpiece 60 and a second workpiece 70 are overlap welded. In the present embodiment, the positioning device 50 simultaneously realizes magnetic attraction positioning of the first workpiece 60 and the second workpiece 70 in an electromagnetic manner. Thus, when positioning the first workpiece 60 and the second workpiece 70, there is no need to use a clamping tool to clamp and fix the first workpiece 60 and the second workpiece 70 separately. Because there is no need to use a clamping tool to rigidly clamp the first workpiece 60 and the second workpiece 70, the welding device 30 will not be affected when welding the first workpiece 60 and the second workpiece 70. In the present embodiment, after welding is completed, the positioning device 50 is closed and the magnetic attraction force disappears, so that the welded first workpiece 60 and the second workpiece 70 can be easily removed from the positioning device 50. Assuming that the positioning device 50 in this embodiment adopts the clamping fixture in the prior art to position and clamp the first workpiece 60 or the second workpiece 70, firstly, the clamping fixture structure in the prior art needs to be contact-positioned with the first workpiece 60 or the second workpiece 70, and since the second workpiece 70 is placed on the first workpiece 60, at least two sets of clamping fixtures are required to clamp the first workpiece 60 and the second workpiece 70 respectively, then the clamping fixture for clamping the second workpiece 70 must be positioned from top to bottom, so that the clamping fixture additionally occupies the operating space of the welding device 30, affecting the normal use of the welding device 30, for example, the clamping fixture will cause obstruction to the weld, and the control requirements for the laser welding equipment 10 will be higher. In this embodiment, the first workpiece 60 and the second workpiece 70 are magnetically positioned by the positioning device 50, firstly, the influence on the clamping positioning is eliminated, and secondly, the occupation of the operating space of the welding device 30 is avoided, so that the laser welding equipment 10 can better perform laser teaching-free welding on thinner sheet metal parts.Through such an arrangement, when the first workpiece 60 and the second workpiece 70 are overlap-welded, the first workpiece 60 and the second workpiece 70 stacked on the first workpiece 60 can be quickly positioned at the same time by the positioning device 50, so that the welding device 30 can easily perform welding operations on the two, and after the welding is completed, the welded product can be quickly removed. In this way, the overall working efficiency of the laser welding equipment 10 can be improved by quickly positioning the first workpiece 60 and the second workpiece 70.

[0057] In one embodiment, if Figure 2 As shown, the positioning device 50 includes a support member 51 and an electromagnetic platform 52 disposed on the support member 51. In this embodiment, the positioning device 50 includes a support member 51 and an electromagnetic platform 52 disposed above the support member 51, wherein the electromagnetic platform 52 generates a magnetic attraction when electrically connected to a power source, and after the first workpiece 60 and the second workpiece 70 are placed on the positioning device 50 according to a preset position, the electromagnetic platform 52 can be electrically connected to the power source so that the electromagnetic platform 52 has a magnetic attraction, and when the electromagnetic platform 52 has a magnetic attraction, the first workpiece 60 and the second workpiece 70 can be magnetically positioned, so that the welding device 30 can weld the two.

[0058] In one embodiment, if Figure 2 or Figure 3As shown, the electromagnetic platform 52 includes a metal block 521 and a plurality of coils 522 wound around the outer circumference of the metal block 521, the plurality of coils 522 are arranged at intervals along the length direction of the metal block 521, and the spacing between adjacent coils 522 is D1; ​​the width of the second workpiece 70 is D2, and D1 is not greater than 0.5*D2. In this embodiment, the electromagnetic platform 52 includes a metal block 521 and a plurality of coils 522 wound around the outer periphery of the metal block 521, wherein the plurality of coils 522 are arranged at intervals along the length direction of the metal block 521, and the length direction of the metal block 521 refers to the direction from the loading end 21 to the unloading end 23 of the conveying device 20, and each coil 522 is independently arranged, that is, each coil 522 is individually energized to allow the current mirror coil 522 to be turned on. The plurality of coils 522 arranged around the outer periphery of the metal block 521 are arranged as above in order to make the magnetic attraction formed by the metal block 521 more balanced (in the prior art, a wire is wound around the outer periphery of an iron core, and one wire forms a plurality of coils 522, so that the magnetic attraction of the two magnetic pole ends of the electromagnetic core formed in this way is strong, and the magnetic attraction in the middle is weak). In order to enable the metal block 521 to achieve a better magnetic attraction effect on the first workpiece 60 and / or the second workpiece 70, in the present embodiment, the distance between two adjacent coils 522 is defined as D1, and the minimum width of the second workpiece 70 stacked on top is defined as D2 (the minimum width of the first workpiece 60 as a carrier must be greater than the minimum width of the second workpiece 70). In order to prevent the second workpiece 70 from being stably magnetically positioned on the first workpiece 60 when the electromagnetic platform 52 is energized, the distance between two adjacent coils 522 needs to be set to refer to D2, which is less than half, so that the second workpiece 70 with the smallest width will not sit on one coil 522 alone, but at least sit on two coils 522. In this way, the second workpiece 70 can also be stably magnetically positioned on the first workpiece 60.

[0059] In one embodiment, if Figure 2 or Figure 3 As shown, the metal block 521 is provided with a mounting hole 523, and the aperture of the mounting hole 523 is D3, and D3 is smaller than D1, and the mounting hole 523 is used for external tooling to be disassembled and assembled. In order to make the positioning device 50 also satisfy the effect of being used for installing and clamping tooling, in this embodiment, a mounting hole 523 is opened on the metal block 521, and the mounting hole 523 is mainly used for external tooling to be disassembled and assembled, such as clamping tooling or positioning tooling, and no excessive restrictions are made on this. In order to prevent the mounting hole 523 from affecting the above-mentioned coil 522 wound on the metal block 521, it is necessary to set the aperture of the mounting hole 523 in a manner smaller than the distance D1 between two adjacent coils 522, so that it will not affect the coil 522. In this embodiment, Figure 2As shown, there are a plurality of mounting holes 523, and the plurality of mounting holes 523 are arranged in an array along the length direction of the metal block 521. Such arrangement enables the user to install the external tooling at a suitable position of the metal block 521 according to actual needs. Figure 3 As shown, in order to prevent the installation hole 523 from affecting two adjacent coils 522, the installation hole 523 is arranged at the corner of the metal block 521, outside the area where the coils 522 are laid on the metal block 521. The specific laying method of the installation hole 523 is not specifically limited.

[0060] In one embodiment, if Figure 2 or Figure 3 As shown, the surface of the metal block 521 away from the support member 51 is provided with a positioning portion 524, and the positioning portion 524 is used to limit the first workpiece 60; and / or the positioning portion 524 includes a first connecting segment 5241 and a second connecting segment 5242 connected to each other, and the connection between the first connecting segment 5241 and the second connecting segment 5242 is bent. In order to enable the first workpiece 60 transferred from the transfer device 40 to be quickly adjusted in position, in this embodiment, a positioning portion 524 is provided on the surface of the metal block 521 away from the support member 51, wherein the positioning portion 524 can abut against the first workpiece 60 when the first workpiece 60 is placed on the surface of the metal block 521, so that the first workpiece 60 can be placed and adjusted with the positioning portion 524. In another embodiment, the positioning portion 524 includes a first connecting section 5241 and a second connecting section 5242, wherein the first connecting section 5241 and the second connecting section 5242 are connected at a 90-degree bend, and the positioning portion 524 is disposed at the corner bend of the metal block 521, the first connecting section 5241 can adjust the first workpiece 60 along the width direction, and the second connecting section 5242 can adjust the first workpiece 60 along the length direction, so that the first workpiece 60 can be quickly placed and adjusted through the positioning portion 524. In other embodiments, the positioning portion 524 and the metal block 521 can be separate components or integrated components, and no further restrictions are made on this, and the first connecting section 5241 and the second connecting section 5242 of the positioning portion 524 can also be disconnected, and no further restrictions are made on this.

[0061] In one embodiment, if Figure 1As shown, the positioning device 50 includes at least two, and the two positioning devices 50 are arranged at intervals along the direction from the feeding end 21 to the unloading end 23 of the conveying device 20. In order to enable the laser welding setting to improve the welding efficiency, in this embodiment, two positioning devices 50 are provided, and the two positioning devices 50 can be arranged at intervals along the direction from the feeding end 21 to the unloading end 23 of the conveying device 20, so that when the laser welding equipment 10 is running, one of the first workpieces 60 on the conveying device 20 can be transferred to the positioning device 50, and then the other first workpiece 60 can be transferred to the other positioning device 50 to perform the positioning operation, so that the two positioning devices 50 can be welded at the same time, thereby achieving the effect of improving the welding efficiency of the laser welding equipment 10. In another embodiment, the two positioning devices 50 may also be arranged on both sides of the conveying device 20. During operation, one of the first workpieces 60 may be selected to be transferred to the positioning device 50 on one side for positioning welding, and then the other first workpiece 60 may be selected to be transferred to the positioning device 50 on the other side for positioning welding. In this way, the same effect as above may be achieved, and no excessive restrictions are placed on the specific installation method of the two positioning devices 50.

[0062] In one embodiment, if Figure 1 , Figure 4 and Figure 5As shown, the transfer device 40 includes a support frame 41, a sliding assembly 42 and a grabbing assembly 43. The support frame 41 is arranged outside the welding operation area, the sliding assembly 42 is slidably arranged on the support frame 41, and the grabbing assembly 43 is arranged on the sliding assembly 42. The sliding assembly 42 is used to drive the grabbing assembly 43 to move, so as to drive the grabbing assembly 43 to grab the first workpiece 60 and / or the second workpiece 70. In this embodiment, the transfer device 40 includes a support frame 41, a sliding assembly 42 and a grabbing assembly 43, wherein the support frame 41 is mainly supported outside the welding operation area of ​​the welding device 30, and the sliding assembly 42 is slidably arranged on the support frame 41, and the grabbing assembly 43 is arranged on the sliding assembly 42, and moves up and down and left and right under the drive of the sliding assembly 42. In actual use, the sliding assembly 42 slides up and down and left and right with the support frame 41 as a fulcrum. When the sliding assembly 42 moves up and down, it can synchronously drive the grabbing assembly 43 to move up and down. When the grabbing assembly 43 moves to When moving downward, it moves toward the conveying device 20. When the grabbing assembly 43 contacts the first workpiece 60 on the conveying device 20, the grabbing assembly 43 grabs the first workpiece 60, and then the sliding assembly 42 drives the grabbing assembly 43 to move upward, and then the sliding assembly 42 drives the grabbing assembly 43 to move to the left, so that the grabbing assembly 43 grabs the first workpiece 60 and moves it to the top of the positioning device 50, and then the sliding assembly 42 drives the grabbing assembly 43 to move downward, so that the grabbing assembly 43 transfers the grabbed first workpiece 60 to the positioning device 50, thereby completing the processing and transportation. After the welding of the first workpiece 60 and the second workpiece 70 is completed, the sliding assembly 42 drives the grabbing assembly 43 to perform the opposite steps to the above, and transfer the first workpiece 60 and the second workpiece 70 back to the conveying device 20, and transport them to the unloading end 23 through the conveying device 20. In other embodiments, the transfer device 40 can be a robotic arm, which is not limited in detail.

[0063] In one embodiment, if Figure 5As shown, the grabbing assembly 43 includes a mounting bracket 431 and a grabbing member 432. The grabbing member 432 is disposed on the mounting bracket 431 and extends downward. The grabbing member 432 includes an electromagnetic magnetic suction head 4321, and the electromagnetic magnetic suction head 4321 is used to magnetically grab the first workpiece 60 and / or the second workpiece 70. In order to enable the grabbing component 43 to stably grab the workpiece, in the present embodiment, the grabbing component 43 includes a mounting bracket 431 and a grabbing member 432, wherein the grabbing member 432 is arranged on the mounting bracket 431 and extends downward, wherein the grabbing member 432 adopts a setting similar to the above-mentioned positioning device 50, and an electromagnetic magnetic suction head 4321 is arranged at the end of the grabbing member 432 away from the mounting bracket 431. When the sliding component 42 drives the grabbing component 43 to move downward and contact the workpiece, the electromagnetic magnetic suction head 4321 is energized to generate magnetic force to magnetically attract the workpiece, and then the workpiece is transported under the drive of the sliding component 42. Such a setting can avoid the clamping of the workpiece by the clamping claw component in the prior art, and the clamping claw component is not convenient for positioning and clamping the workpiece, and it is also easy to damage the workpiece.

[0064] In one embodiment, if Figure 5 As shown, there are multiple gripping assemblies 43; each of the gripping assemblies 43 is also provided with a driving member 433, the driving member 433 is provided on the mounting bracket 431, the gripping member 432 is provided on the driving member 433, and the driving member 433 is used to drive the gripping member 432 to move so that each of the gripping assemblies 43 is in contact with the first workpiece 60 and / or the second workpiece 70. In order to enable the electromagnetic magnetic suction head 4321 of the gripping member 432 to stably achieve magnetic suction to the workpiece, in this embodiment, a plurality of gripping assemblies 43 are provided, and the plurality of gripping assemblies 43 are arranged in an array on the mounting bracket 431. Furthermore, since the second workpiece 70 protrudes from the first workpiece 60 after the welding of the first workpiece 60 and the second workpiece 70 is completed, in order to facilitate each gripping assembly 43 to have a magnetic suction effect on the first workpiece 60 and the second workpiece 70, in this embodiment, a driving member 433 is also provided on the mounting bracket 431. Part 433, wherein each grasping component 43 includes a driving component 433, and each driving component 433 operates independently. When multiple grasping components 43 descend to realize magnetic attraction to the first workpiece 60 and the second workpiece 70, the driving component 433 drives each grasping component 432 to extend, so that the electromagnetic magnetic attraction head 4321 of each grasping component 432 is in contact with the first workpiece 60 or the second workpiece 70 to magnetically attract the first workpiece 60 or the second workpiece 70, so that the first workpiece 60 and / or the second workpiece 70 can be stably transported.

[0065] In one embodiment, if Figure 5As shown, the sliding assembly 42 includes a lifting member 421 and a translation member 422. The lifting member 421 is slidably disposed on the support frame 41, and the translation member 422 is slidably disposed on the lifting member 421. The grabbing assembly 43 is disposed on the translation member 422. The lifting member 421 drives the translation member 422 and the grabbing assembly 43 to slide in the up and down directions, and the translation member 422 drives the grabbing assembly 43 to slide in the left and right directions. In this embodiment, the sliding assembly 42 includes a lifting member 421 and a translation member 422, wherein the lifting member 421 and the translation member 422 are both slide rail structures, wherein the lifting member 421 is arranged on the support frame 41, and the translation member 422 is arranged on the side of the lifting member 421 away from the support frame 41, the lifting member 421 can drive the translation member 422 to move up and down, and the translation member 422 can drive the grabbing assembly 43 to move left and right. Since the lifting member 421 and the translation member 422 in the sliding assembly 42 are both existing technologies, no excessive restrictions are made on this. Of course, in other embodiments, the lifting member 421 can be a lifting arm, and the translation member 422 can also be a telescopic arm, and no excessive restrictions are made on this, as long as it can meet the requirements of pushing the grabbing assembly 43 to move up and down and left and right.

[0066] In one embodiment, the laser welding equipment 10 further includes a control device, which is respectively connected to the conveying device 20, the welding device 30, the transfer device 40 and the positioning device 50 in communication; the control device is used to control the conveying device 20 to transfer the first workpiece 60 from the loading end 21 to the transfer area 22 and the unloading end 23, and when the first workpiece 60 is transported to the transfer area 22, the control device controls the transfer device 40 to transfer the first workpiece 60 to the positioning device 50, and then places the second workpiece 70 in a stacked manner on the transfer area 22. After the first workpiece 60 is preset, the control device controls the positioning device 50 to open, so as to magnetically position the first workpiece 60 and the second workpiece 70 above the first workpiece 60. After the magnetic positioning is completed, the control device controls the welding device 30 to perform lap welding on the first workpiece 60 and the second workpiece 70. After the welding is completed, the control device controls the transfer device 40 to transfer the welded first workpiece 60 and the second workpiece 70 to the conveying device 20, and then transport them to the unloading end 23 through the conveying device 20. In this embodiment, the laser welding equipment 10 also includes a control device (not shown in the figure), wherein the control device is a teaching-free system, and the control device is respectively connected to the conveying device 20, the welding device 30, the transfer device 40 and the positioning device 50 for communication. As for the connection means, it can be a line connection or a wireless connection, which is not limited in detail.

[0067] In one embodiment, a camera and a line laser scanner are provided above the positioning device 50, and the camera and the line laser scanner are both connected to the control device in communication, so as to provide the control device with the positioning information of the positioning device 50 on the first workpiece 60 and the second workpiece 70. In order to enable the control device to obtain the positioning information of the first workpiece 60 and the second workpiece 70 in real time, and to enable the control device to control the welding device 30 to perform deviation correction welding, in this embodiment, a camera and a line laser scanner (not shown in the figure) are also provided. Since the positioning device 50 in this embodiment adopts a magnetic positioning device 50, there is enough space above the positioning device 50, so it is convenient to install the camera and the line laser scanner. Of course, other auxiliary devices can also be installed, and there is no excessive limitation on this. When the control device controls the laser welding equipment 10 to run, the camera is positioned, and then the line laser scanner uploads the deviation between the actual workpiece weld and the planned weld path, so that the welding device 30 corrects the deviation for welding.

[0068] In one embodiment, when the control device controls the positioning device 50 to operate, the magnetic attraction force of the metal block 521 of the positioning device 50 is not less than 120N / cm3. In order for the metal block 521 of the positioning device 50 to have a good magnetic attraction positioning effect on the first workpiece 60 and the second workpiece 70, the magnetic attraction force generated by the metal block 521 in the positioning device 50 after the coil 522 is energized cannot be less than 120N / cm3.

[0069] In one embodiment, if Figure 6 and Figure 7As shown, the welding device 30 includes a slide rail 32 and a mechanical welding arm 31, the slide rail 32 is arranged between the conveying device 20 and the positioning device 50, the control device is communicatively connected with the mechanical welding arm 31, and the control device is used to control the mechanical welding wall to slide on the slide rail 32. In this embodiment, the welding device 30 is arranged between the conveying device 20 and the positioning device 50, so as to facilitate the formation of a loading position of the second workpiece 70 on the side of the positioning device 50 away from the welding device 30. In this embodiment, in order to improve the welding efficiency of the welding device 30, the welding device 30 includes a slide rail 32, and the slide rail 32 is arranged on the ground to support the mechanical welding arm 31, wherein the mechanical welding arm 31 has a movable structure, that is, the mechanical welding arm 31 can move along the slide rail 32 according to actual needs to realize welding of multiple different welding points of the first workpiece 60 and the second workpiece 70, thereby improving the welding efficiency. Secondly, when there are two positioning devices 50 and they are arranged in the direction from the loading end 21 to the unloading end 23 of the conveying device 20, a mechanical welding arm 31 moves along the slide rail 32 to the other positioning device 50 for welding after the welding of the first workpiece 60 and the second workpiece 70 on one of the positioning devices 50 is completed. Since the first workpiece 60 and the second workpiece 70 need to be transported back to the conveying device 20 through the transfer device 40 after the welding is completed, this can not only improve the practicality of the mechanical welding arm 31, but also avoid the mechanical welding arm 31 from affecting the transfer device 40.

[0070] In one embodiment, the stacked thickness of the first workpiece 60 and / or the second workpiece 70 is not greater than 3 mm. The laser welding device 10 in this embodiment is used to weld the stacked first workpiece 60 and the second workpiece 70 with a thickness less than 3 mm by laser.

[0071] The present invention also proposes a positioning device 50, including a support member 51 and an electromagnetic platform 52, wherein the electromagnetic platform 52 is arranged above the support member 51, and the electromagnetic platform 52 includes a metal block 521 and a plurality of coils 522 wound around the outer circumference of the metal block 521, each of the coils 522 has a power-on state and a power-off state, and in the power-on state, the metal block 521 has a magnetic attraction force to magnetically position the workpiece.

[0072] In an embodiment of the present invention, the positioning device 50 is different from the clamping tool in the prior art. The positioning device 50 in this embodiment includes a support 51 and an electromagnetic platform 52, wherein the electromagnetic platform 52 includes a metal block 521 and a plurality of coils 522 wound around the outer periphery of the metal block 521, and each coil 522 is independently energized. When each coil 522 is energized, the metal block 521 generates a magnetic force. When the metal block 521 has a magnetic force, at least one workpiece placed on the metal block 521 can be magnetically positioned. This arrangement can not only quickly position the workpiece, but also avoid rigid clamping and positioning of the workpiece. Such an arrangement is also convenient when the workpiece needs to be taken out. The workpiece can be taken out by simply turning off the power to the coil 522.

[0073] The present invention also provides a laser welding process, comprising:

[0074] Loading the first workpiece 60 from the loading end 21 onto the conveying device 20;

[0075] When the first workpiece 60 moves to the transfer area 22 of the conveying device 20 , the transfer device 40 transfers the first workpiece 60 to the positioning device 50 ;

[0076] When the first workpiece 60 is placed on the positioning device 50, the second workpiece 70 can be placed on the preset position of the first workpiece 60 in a stacked manner, and the positioning device 50 is turned on, so that the positioning device 50 can magnetically position the first workpiece 60 and the second workpiece 70 located above the first workpiece 60;

[0077] When positioning is completed, the welding device 30 performs stitch welding on the first workpiece 60 and the second workpiece 70;

[0078] After welding is completed, the transfer device 40 transfers the welded first workpiece 60 and the second workpiece 70 to the conveying device 20 , and conveys them to the unloading area through the conveying device 20 .

[0079] The embodiment of the present invention mainly controls the above-mentioned devices to perform corresponding operations through a control device, so as to achieve the purpose of teaching-free laser welding.

[0080] In one embodiment, when the welding device 30 welds the first workpiece 60 and the second workpiece 70, a preset protection time is referred to, and the preset protection time is not greater than the time it takes for the welding device 30 to penetrate the thickness of the first workpiece 60 or the second workpiece 70 at the same working power. In order to prevent the laser of the welding device 30 from welding the first workpiece 60 or the second workpiece 70 for a long time, thereby penetrating the first workpiece 60 or the second workpiece 70 and causing damage to the positioning device 50 carrying the first workpiece 60 and the second workpiece 70, and affecting the reuse of the positioning device 50, in this embodiment, the laser power is set according to the thickness of different first workpieces 60 or the thickness of the stacked first workpiece 60 and the second workpiece 70 of the same material. The setting method is the correspondence between the single-point light emission time of laser welding and the burning through the first workpiece 60 or the stacked first workpiece 60 and the second workpiece 70 of the same material. The penetration time T is calculated according to different laser powers, and the time T data is uploaded to form a preset protection time, and the welding device 30 is defined to automatically cut off the light after the single-point light emission exceeds the time T, so as to prevent the laser emitted by the welding device 30 from exceeding the preset protection time and penetrating the first workpiece 60 or the first workpiece 60 and the second workpiece 70 of the same material and causing damage to the positioning device 50. In other embodiments, different penetration times T can be measured for workpieces of different materials or in different welding areas of the workpiece in the above manner, and the time T data can be uploaded so that the laser welding equipment 10 can preset different protection times according to the material, thickness and welding area of ​​the workpiece, so as to further prevent the laser from penetrating the workpiece and causing damage to the positioning device 50.

[0081] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A laser welding device, characterized in that: include: A conveying device, comprising a loading end, a unloading end and a transfer area between the loading end and the unloading end, wherein the conveying device is used to sequentially convey the first workpiece from the loading end to the transfer area and the unloading end; A welding device is arranged adjacent to the conveying device and between the loading end and the unloading end, and the welding device has a welding operation area; A transfer device, disposed above the conveying device, and used for transporting the first workpiece between the transfer area and the welding operation area; as well as A positioning device, arranged in a welding operation area of ​​the welding device; The positioning device is used to carry the first workpiece transported by the transfer device and the second workpiece stacked on the first workpiece, and is also used to magnetically position the first workpiece and the second workpiece; The welding device is used to weld the first workpiece and the second workpiece which are magnetically positioned on the positioning device.

2. The laser welding equipment according to claim 1, characterized in that: The positioning device comprises a support member and an electromagnetic platform arranged on the support member.

3. The laser welding equipment according to claim 2, characterized in that: The electromagnetic platform includes a metal block and a plurality of coils wound around the outer circumference of the metal block, wherein the plurality of coils are arranged at intervals along the length direction of the metal block, and the interval between adjacent coils is D1; The width of the second workpiece is D2, and D1 is not greater than 0.5*D2.

4. The laser welding equipment according to claim 3, characterized in that: The metal block is provided with a mounting hole, the aperture of the mounting hole is D3, and D3 is smaller than D1. The mounting hole is used for external tooling to disassemble and assemble.

5. The laser welding equipment according to claim 2, characterized in that: A positioning portion is convexly provided on the surface of the metal block facing away from the support member, and the positioning portion is used to limit the position of the first workpiece; And / or, the positioning portion includes a first connecting segment and a second connecting segment connected to each other, and a connection between the first connecting segment and the second connecting segment is bent.

6. The laser welding equipment according to claim 1, characterized in that: The positioning devices include at least two, and the two positioning devices are arranged at intervals along the direction from the loading end to the unloading end of the conveying device.

7. The laser welding equipment according to claim 1, characterized in that: The transfer device includes a support frame, a sliding assembly and a grabbing assembly. The support frame is arranged outside the welding work area, the sliding assembly can be slidably arranged on the support frame, and the grabbing assembly is arranged on the sliding assembly. The sliding assembly is used to drive the grabbing assembly to move so as to drive the grabbing assembly to grab the first workpiece and / or the second workpiece.

8. The laser welding equipment according to claim 7, characterized in that: The grabbing assembly includes a mounting bracket and a grabbing member, wherein the grabbing member is disposed on the mounting bracket and extends downward, and the grabbing member includes an electromagnetic magnetic suction head, and the electromagnetic magnetic suction head is used for magnetically grabbing the first workpiece and / or the second workpiece.

9. The laser welding equipment according to claim 8, characterized in that: The number of the grabbing components is multiple; Each of the grabbing assemblies is also provided with a driving member, the driving member is provided on the mounting bracket, the grabbing member is provided on the driving member, and the driving member is used to drive the grabbing member to move so that each of the grabbing assemblies fits the first workpiece and / or the second workpiece.

10. The laser welding equipment according to claim 7, characterized in that: The sliding assembly includes a lifting member and a translation member, the lifting member is slidably disposed on the support frame, the translation member is slidably disposed on the lifting member, the grabbing assembly is disposed on the translation member, the lifting member drives the translation member and the grabbing assembly to slide in the up and down directions, and the translation member drives the grabbing assembly to slide in the left and right directions.

11. The laser welding equipment according to any one of claims 1 to 10, characterized in that: The laser welding equipment also includes a control device, which is communicatively connected with the conveying device, the welding device, the transfer device and the positioning device respectively.

12. The laser welding equipment according to claim 11, characterized in that: A camera and a line laser scanner are provided above the positioning device. Both the camera and the line laser scanner are communicatively connected to the control device to provide the control device with positioning information of the positioning device on the first workpiece and the second workpiece.

13. The laser welding equipment according to claim 11, characterized in that: When the control device controls the positioning device to operate, the magnetic attraction force of the metal block of the positioning device is not less than 120N / cm3.

14. The laser welding equipment according to claim 11, characterized in that: The welding device comprises a slide rail and a mechanical welding arm, wherein the slide rail is arranged between the conveying device and the positioning device, the control device is communicatively connected with the mechanical welding arm, and the control device is used to control the mechanical welding wall to slide on the slide rail.

15. The laser welding equipment according to any one of claims 1 to 10, characterized in that: The stacked thickness of the first workpiece and / or the second workpiece is not greater than 3 mm.

16. A positioning device, characterized in that: include: Supports; An electromagnetic platform is arranged above the support member, and comprises a metal block and a plurality of coils wound around the outer circumference of the metal block. Each of the coils has a power-on state and a power-off state. In the power-on state, the metal block has a magnetic attraction to magnetically position the workpiece.

17. A laser welding process, characterized in that: include: Loading the first workpiece from the loading end onto the conveying device; When the first workpiece moves to the transfer area of ​​the conveying device, the transfer device transfers the first workpiece to the positioning device; When the first workpiece is placed on the positioning device, the second workpiece can be placed on the preset position of the first workpiece in a stacked manner, and the positioning device is turned on to allow the positioning device to magnetically position the first workpiece and the second workpiece located above the first workpiece; When the positioning is completed, the welding device welds the first workpiece and the second workpiece; After welding is completed, the transfer device transfers the welded first workpiece and the second workpiece to the conveying device, and conveys them to the unloading area through the conveying device.

18. The laser welding process according to claim 17, characterized in that: When the welding device welds the first workpiece and the second workpiece, a preset protection time is referred to, and the preset protection time is not greater than the time it takes for the welding device to penetrate the thickness of the first workpiece or the second workpiece at the same working power.

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