A device for precisely controlling heat during laser welding of heterogeneous additive parts

Abstract

A device for precisely controlling heat during the laser welding process of heterogeneous additive parts relates to the field of laser welding, and includes a welding body, a movable frame is installed on the welding body, a lifting frame is installed on the movable frame, and a laser welding head for welding is installed on the bottom side of the lifting frame; it also includes a temperature control device and a protective clamping device. It should be noted that the temperature of the welding point of the LMD print and the SLM print is controlled by the temperature control device to achieve uniform regulation of the microstructure of the welding joint, and solve the problems of disordered distribution of the microstructure of the welding joint of heterogeneous additive parts and decreased mechanical properties; in addition, two clamping wheels clamp the LMD print and the SLM print respectively, and two support frames support the weld and clean the sides of the two prints, thereby ensuring the quality of welding, and at the same time, the rotating baffle can close the laser welding head, which fully ensures the safety of components such as the welding table and the laser welding head.

Description

Technical Field

[0001] The present invention relates to the technical field of laser welding, and in particular to a device for precisely controlling heat during the laser welding process of heterogeneous additive parts. Background Art

[0002] Laser additive-welding integrated manufacturing technology combines the advantages of laser selective melting (SLM), laser metal deposition (LMD) and laser welding, which can effectively improve the structural processing accuracy and designability, reduce stress concentration and fatigue weak areas, and provide a new solution for the rapid manufacturing of complex structures; however, this process inevitably involves the welding of laser selective melting (SLM) structural parts and laser metal deposition (LMD) structural parts. The grains of LMD printed parts are coarse, and the grains of SLM printed parts are fine. The grain structure and performance of the welded joint are affected by the parent material structure, showing unevenness, which is difficult to meet service requirements. This application aims to propose a precise heat control device for the laser welding process of heterogeneous additive parts. Through the coordinated loading of external cooling medium / thermal field, the heat of the welding process can be effectively controlled, so as to achieve the purpose of homogenizing the microstructure and mechanical properties of the laser welded joints of heterogeneous additive printed parts.

[0003] In addition, it should be noted that in the prior art, when different materials of additive parts are welded, the temperature of laser welding is very high. Therefore, when the additive parts are welded, there are dimensional errors, which will cause the laser to continue to irradiate, and then directly melt through the welding table or even the welding body, thereby causing equipment damage; in addition, when some materials are printed, the temperature rises rapidly in a short period of time, causing the material to deform due to temperature changes, and then the welding accuracy is reduced, which may lead to unqualified material dimensions at the least, and even directly cause material waste in severe cases, thereby causing great economic losses to the company. Summary of the invention

[0004] The purpose of the present invention is to provide a device for accurately controlling heat during laser welding of heterogeneous additive parts to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A device for precisely controlling heat during laser welding of heterogeneous additive parts, comprising a welding body, a moving frame mounted on the welding body, a lifting frame mounted on the moving frame, and a laser welding head for welding mounted on the bottom side of the lifting frame;

[0007] It also includes a temperature control device, which is used to accurately control the heat of the welding process. The temperature control device includes a welding table, on which an LMD print and an SLM print are placed, and the laser welding head is used to weld the LMD print and the SLM print. A welding mobile table is provided above the welding table, and a shielding gas nozzle and a retractable slider are installed on the bottom side of the welding mobile table. A liquid nitrogen bottle and a shielding gas bottle are connected to one side of the shielding gas nozzle. The shielding gas nozzle sprays the cooled shielding gas on the surface of the welding molten pool to protect and cool the welding process. A welding rotary rolling heating head is installed on the bottom side of the retractable slider, and the welding rotary rolling heating head performs rotary rolling and heating on the weld at the rear end of the molten pool;

[0008] It also includes a protective clamping device, which is installed on the laser welding head, and is used to protect the laser welding head and clamp the LMD print part and the SLM print part; the protective clamping device includes a socket, and the socket is socketed on the laser welding head, and a rotating baffle is rotatably installed on the bottom side of the socket, and the rotating baffle is used to close the laser welding head, and clamping racks are movably installed on both sides of the socket, and a clamping wheel is rotatably installed on one side of the clamping rack, and the two clamping wheels are used to press the LMD print part and the SLM print part;

[0009] A supporting and cleaning device is installed on the protective clamping device, and the supporting and cleaning device is used to support the gap between the LMD print part and the SLM print part and clean the gap; the supporting and cleaning device includes two support frames, and the two support frames are movably installed on the bottom side of the rotating baffle, and a telescopic rod is movably installed on the bottom side of the support frame.

[0010] Furthermore, in a preferred embodiment of the present invention, the temperature control device further comprises a water-cooled copper block and a heating copper block, and the water-cooled copper block and the heating copper block are both embedded in the welding table;

[0011] The water-cooled copper block and the heating copper block are respectively located on the bottom sides of the LMD printed part and the SLM printed part. The water-cooled copper block is used to cool the LMD printed part, and the heating copper block is used to heat the SLM printed part.

[0012] Further, in a preferred embodiment of the present invention, the protective gas cylinder is connected to a protective gas pipe, the protective gas pipe is connected to the protective gas nozzle, and a cavity is provided in the welding movable platform, and the protective gas pipe is located in the cavity of the welding movable platform;

[0013] The liquid nitrogen bottle is connected with a liquid nitrogen delivery pipe, and the other end of the liquid nitrogen delivery pipe extends into the cavity of the welding movable platform, so as to cool down the protective gas pipe.

[0014] Furthermore, in a preferred embodiment of the present invention, two lifting cylinders are installed on the bottom side of the welding movable platform, and the two lifting cylinders drive the welding movable platform to move up and down;

[0015] Two slideways are arranged on the top side of the welding platform, and sliders are slidably installed in the two slideways, and the two sliders are respectively installed on the two lifting cylinders.

[0016] Furthermore, in a preferred embodiment of the present invention, the protective clamping device further comprises a closing plate, the closing plate being movably mounted on the rotating baffle, and the closing plate being used to close the laser welding head;

[0017] A support spring is installed on the closing plate, and the other end of the support spring is installed on the rotating baffle.

[0018] Furthermore, in a preferred embodiment of the present invention, a rotating frame is installed on both sides of the rotating baffle, and the two rotating frames are rotatably installed on both sides of the sleeve seat respectively;

[0019] A reset gear is installed on the side of the two rotating frames away from each other, and the two clamping rack frames are respectively engaged with the two reset gears. Limiting grooves are opened on both sides of the sleeve seat, and the two clamping rack frames are respectively slidably installed in the two limiting grooves.

[0020] Furthermore, in a preferred embodiment of the present invention, a rotation groove is provided on both sides of the sleeve seat, a rotation shaft is rotatably installed in the rotation groove, and the rotating frame and the reset gear are both sleeved on the rotation shaft;

[0021] A rebound torsion spring is installed on the inner wall of the rotating groove, and the other end of the rebound torsion spring is installed on the rotating shaft;

[0022] A linkage socket is sleeved on the sleeve seat, and the laser welding head is inserted into the welding movable platform through the linkage socket.

[0023] Furthermore, in a preferred embodiment of the present invention, the supporting and cleaning device further comprises two linkage frames, and the two linkage frames are respectively mounted on the top sides of the two propping frames;

[0024] Two adjusting rotating rods are rotatably mounted on one side of the rotating baffle plate, and transfer shafts are rotatably mounted on the two adjusting rotating rods. The two transfer shafts are movably mounted in the two linkage frames respectively.

[0025] Furthermore, in a preferred embodiment of the present invention, the top ends of the two adjusting rotating rods are both equipped with synchronous gears, and the two synchronous gears are meshed with each other;

[0026] Two gear shafts are installed on one side of the rotating baffle, and the two synchronous gears are rotatably installed on the two gear shafts respectively, and a locking nut is threadedly installed on one of the gear shafts.

[0027] Furthermore, in a preferred embodiment of the present invention, a return spring is installed on the top side of the telescopic rod, and the top end of the return spring is installed on the top inner wall of the support frame;

[0028] An adjusting groove is provided on the bottom side of the rotating baffle, and the support frame is slidably installed in the adjusting groove.

[0029] The beneficial effects of the device for accurately controlling heat during laser welding of heterogeneous additive parts proposed by the present invention are:

[0030] In the present invention, through the setting of the temperature control device, the water-cooled copper block is installed at the lower part of the LMD print to achieve rapid cooling of the LMD print during the welding process; the heating copper block is installed at the lower part of the SLM print to achieve heating of the SLM print before, during and after the welding process, the shielding gas in the shielding gas cylinder is input into the shielding gas nozzle through the shielding gas pipe, and the nitrogen in the liquid nitrogen bottle is input into the cavity of the welding mobile platform at the same time, the shielding gas is cooled to achieve continuous cooling of the shielding gas, and the cooled shielding gas reaches the surface of the welding molten pool through the shielding gas nozzle to achieve protection and cooling of the welding process, so as to achieve the purpose of grain refinement of the weld; in addition, when the welding mobile platform moves, one side of the SLM print is heated by the rotation of the welding rotary rolling heating head, so as to achieve rotary rolling and heating of the weld at the rear end of the molten pool, so as to achieve the purpose of coarsening the weld grain, thereby achieving uniform regulation of the microstructure of the weld joint, and solving the problems of disordered distribution of microstructure and decreased mechanical properties of the weld joint of heterogeneous additive parts.

[0031] Furthermore, in the present invention, by setting a protective clamping device, when the laser welding head moves down for welding, the two clamping wheels respectively clamp the LMD print and the SLM print, so as to prevent the LMD print and the SLM print from being deformed due to temperature changes during printing. At the same time, when the laser welding head continues to move and separates from the print, the rotating baffle can return to its original position in time to close the laser welding head, so as to prevent damage to the welding table caused by continuous laser irradiation. In addition, the sealing of the laser head can also prevent the laser welding head from being damaged by collision during loading and unloading of prints or other unexpected situations, thereby fully ensuring the safety of components such as the welding table and the laser welding head.

[0032] Furthermore, in the present invention, by setting up a support and cleaning device, during welding, the distance between the two support frames is adjusted according to the position of the weld, and when the rotating baffle is unfolded, the two support frames respectively drive the two telescopic rods to contact the side edges of the two printed parts, thereby supporting the weld and avoiding the problem of weld size change caused by deformation of the printed parts. At the same time, when the rotating baffle moves, it drives the telescopic rod of the support frame box to move, so that the sides of the two printed parts can be cleaned, thereby ensuring the quality of welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the three-dimensional structure of a device for accurately controlling heat during laser welding of heterogeneous additive parts provided by an embodiment of the present invention;

[0034] Figure 2 A schematic diagram of the structure of a laser welding head and a protective clamping device and other structures connected to a device for accurately controlling the heat during laser welding of heterogeneous additive parts provided by an embodiment of the present invention;

[0035] Figure 3 A schematic diagram of the structure of the connection between a welding table and an LMD printed part and other structures of a device for accurately controlling the heat during laser welding of heterogeneous additive parts provided by an embodiment of the present invention;

[0036] Figure 4 A schematic diagram of the structure of the connection between a lowering cylinder and a slider and other structures of a heat precision control device for laser welding of heterogeneous additive parts provided by an embodiment of the present invention;

[0037] Figure 5 A device for accurately controlling heat during laser welding of heterogeneous additive parts provided by an embodiment of the present invention Figure 4 The structural diagram of part A in the figure;

[0038] Figure 6 A schematic cross-sectional view of the connection between a welding movable platform and a liquid nitrogen bottle and other structures of a heat precision control device for a laser welding process of heterogeneous additive parts provided by an embodiment of the present invention;

[0039] Figure 7 A schematic diagram of a partial cross-sectional structure of a connection between a sleeve seat and a rotating shaft and other structures of a heat precision control device for a laser welding process of heterogeneous additive parts provided by an embodiment of the present invention;

[0040] Figure 8 A schematic diagram of the structure of a device for accurately controlling the heat during laser welding of heterogeneous additive parts provided by an embodiment of the present invention, wherein a rotating baffle plate is connected to a support frame and other structures;

[0041] Fig. 9A schematic diagram of the structure of the connection between a rotating baffle and a closing plate and other structures of a device for accurately controlling the heat during laser welding of heterogeneous additive parts provided by an embodiment of the present invention;

[0042] Fig.10 A schematic diagram of the structure of the connection between the support frame and the telescopic rod and other structures of the device for precise heat control during the laser welding process of heterogeneous additive parts provided by an embodiment of the present invention.

[0043] In the figure: 1-welding body; 2-mobile frame; 3-lifting frame; 4-laser welding head; 5-temperature control device; 501-welding table; 502-LMD print; 503-SLM print; 504-water-cooled copper block; 505-heating copper block; 506-welding mobile table; 507-protective gas nozzle; 508-retractable slider; 509-welding rotating rolling heating head; 510-liquid nitrogen bottle; 511-protective gas bottle; 512-liquid nitrogen delivery pipe; 513-protective gas pipe; 514-lifting cylinder; 515-slider; 516-slideway; 6-protective clamping device; 60 1- socket seat; 602- rotating baffle; 603- rotating frame; 604- rotating shaft; 605- rotating groove; 606- rebound torsion spring; 607- reset gear; 608- clamping rack; 609- clamping wheel; 610- limiting groove; 611- closing plate; 612- supporting spring; 613- linkage plug sleeve; 7- supporting cleaning device; 701- opening frame; 702- telescopic rod; 703- returning spring; 704- adjusting groove; 705- adjusting rotating rod; 706- transfer shaft; 707- synchronous gear; 708- gear shaft; 709- locking nut; 710- linkage frame. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0046] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0047] In addition, in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invented product is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0048] In addition, the terms "horizontal", "vertical", "perpendicular" and the like do not mean that the components are required to be absolutely vertical, but can be slightly tilted. For example, "vertical" only means that its direction is more vertical than "horizontal", and does not mean that the structure must be completely vertical, but can be slightly tilted.

[0049] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] Please refer to the attached manual Figure 1-10 An embodiment of the present invention provides a device for precisely controlling heat during laser welding of heterogeneous additive parts, which includes a welding body 1, a moving frame 2 is installed on the welding body 1, a lifting frame 3 is installed on the moving frame 2, and a laser welding head 4 for welding is installed on the bottom side of the lifting frame 3.

[0051] More specifically, in the embodiment of the present invention, a temperature control device 5 is also included. The temperature control device 5 is used to accurately control the heat of the welding process. The temperature control device 5 includes a welding table 501. An LMD print 502 and an SLM print 503 are placed on the welding table 501. The laser welding head 4 is used to weld the LMD print 502 and the SLM print 503. A welding movable table 506 is provided above the welding table 501. A shielding gas nozzle 507 and a retractable slider 508 are installed on the bottom side of the welding movable table 506. A liquid nitrogen bottle 510 and a shielding gas bottle 511 are connected to one side of the shielding gas nozzle 507. The shielding gas nozzle 507 sprays the cooled shielding gas on the surface of the welding molten pool to protect and cool the welding process. A welding rotating rolling heating head 509 is installed on the bottom side of the retractable slider 508. The welding rotating rolling heating head 509 rotates, rolls and heats the weld at the rear end of the molten pool. It should be noted that, in the embodiment of the present invention, the shielding gas in the shielding gas cylinder 511 is input into the shielding gas nozzle 507 through the shielding gas pipe 513, and the nitrogen in the liquid nitrogen bottle 510 is input into the cavity of the welding movable table 506 at the same time, so as to cool the shielding gas and realize continuous cooling of the shielding gas. The cooled shielding gas reaches the surface of the welding molten pool through the shielding gas nozzle 507, so as to realize the protection and cooling of the welding process, so as to achieve the purpose of refining the weld grain. In addition, when the welding movable table 506 moves, one side of the SLM print 503 is heated by the rotation of the welding rotating rolling heating head 509, so as to realize the rotational rolling and heating of the weld at the rear end of the molten pool, so as to further achieve the purpose of coarsening the weld grain.

[0052] For further information, please refer to the attached manual. Figure 7-9, a device for precisely controlling heat during the laser welding process of heterogeneous additive parts provided in an embodiment of the present invention also includes a protective clamping device 6, which is installed on the laser welding head 4. The protective clamping device 6 is used to protect the laser welding head 4 and clamp the LMD print 502 and the SLM print 503; specifically, the protective clamping device 6 includes a socket 601, which is socketed on the laser welding head 4, and a rotating baffle 602 is rotatably installed on the bottom side of the socket 601, and the rotating baffle 602 is used to close the laser welding head 4, and clamping racks 608 are movably installed on both sides of the socket 601, and a clamping wheel 609 is rotatably installed on one side of the clamping rack 608, and the two clamping wheels 609 are used to press the LMD print 502 and the SLM print 503. It should be noted that, in the embodiment of the present invention, when the laser welding head 4 moves down for welding, the rotating baffle 602 is opened, and the two clamping racks 608 drive the two clamping wheels 609 to clamp the LMD print 502 and the SLM print 503 respectively, so as to avoid the deformation of the LMD print 502 and the SLM print 503 due to temperature changes during printing. At the same time, when the rotating baffle 602 is closed, it can avoid damage to the welding table 501 caused by continuous laser irradiation, and can avoid the problem of the laser welding head 4 being damaged by collision during loading and unloading of prints or other unexpected situations, thereby fully ensuring the safety of the welding table 501 and the laser welding head 4.

[0053] More specifically, a support and cleaning device 7 is installed on the protective clamping device 6, and the support and cleaning device 7 is used to support the gap between the LMD print 502 and the SLM print 503, and clean the gap; wherein, the support and cleaning device 7 includes two support frames 701, and the two support frames 701 are both movably installed on the bottom side of the rotating baffle 602, and the bottom side of the support frame 701 is movably installed with a telescopic rod 702. It should be noted that in the embodiment of the present invention, during welding, the distance between the two support frames 701 is adjusted according to the position of the weld, and the two support frames 701 respectively drive the two telescopic rods 702 to contact the side edges of the two prints, so as to support the weld and avoid the problem of the weld size change caused by the deformation of the print. At the same time, when the rotating baffle 602 moves, it drives the support frames 701 and the telescopic rods 702 to move, so as to clean the sides of the two prints, thereby ensuring the quality of welding.

[0054] For further information, please refer to the attached manual. Figure 3-6, an embodiment of the present invention provides a heat precision control device for the laser welding process of heterogeneous additive parts, the temperature control device 5 also includes a water-cooled copper block 504 and a heating copper block 505, the water-cooled copper block 504 and the heating copper block 505 are both embedded on the welding table 501; and the water-cooled copper block 504 and the heating copper block 505 are respectively located on the bottom side of the LMD print 502 and the SLM print 503, the water-cooled copper block 504 is used to cool the LMD print 502, and the heating copper block 505 is used to heat the SLM print 503. It should be noted that in the embodiment of the present invention, the water-cooled copper block 504 is installed at the bottom of the LMD print 502 to achieve rapid cooling of the LMD print 502 during the welding process; the heating copper block 505 is installed at the bottom of the SLM print 503 to achieve heating of the SLM print 503 before, during and after the welding process.

[0055] More specifically, in the embodiment of the present invention, the protective gas cylinder 511 is connected to a protective gas pipe 513, the protective gas pipe 513 is connected to the protective gas nozzle 507, and a cavity is provided in the welding movable platform 506, and the protective gas pipe 513 is located in the cavity of the welding movable platform 506;

[0056] In addition, a liquid nitrogen delivery pipe 512 is connected to the liquid nitrogen bottle 510, and the other end of the liquid nitrogen delivery pipe 512 extends into the cavity of the welding mobile platform 506, which is used to cool the shielding gas pipe 513. It should be noted that in the embodiment of the present invention, the shielding gas in the shielding gas bottle 511 is input into the shielding gas nozzle 507 through the shielding gas pipe 513, and the nitrogen in the liquid nitrogen bottle 510 is input into the cavity of the welding mobile platform 506, so as to cool the shielding gas and realize continuous cooling of the shielding gas. The cooled shielding gas reaches the surface of the welding molten pool through the shielding gas nozzle 507, so as to realize protection and cooling of the welding process, so as to achieve the purpose of grain refinement of the weld. In addition, when the welding mobile platform 506 moves, one side of the SLM print 503 is heated by the rotation of the welding rotary rolling heating head 509, so as to realize rotary rolling and heating of the weld at the rear end of the molten pool, so as to further achieve the purpose of grain coarsening of the weld.

[0057] Please continue to refer to the instruction manual Figure 3-6, more specifically, in the embodiment of the present invention, two lifting cylinders 514 are installed on the bottom side of the welding movable platform 506, and the two lifting cylinders 514 drive the welding movable platform 506 to move up and down; in addition, two slideways 516 are provided on the top side of the welding platform 501, and sliders 515 are slidably installed in the two slideways 516, and the two sliders 515 are respectively installed on the two lifting cylinders 514. It should be noted that in the embodiment of the present invention, during the movement of the laser welding head 4, the welding movable platform 506 is driven to move, and the movement of the welding movable platform 506 drives the two lifting cylinders 514 to move, so that the two lifting cylinders 514 slide in the two slideways 516 through the two sliders 515, and the lifting cylinders 514 are used to drive the welding movable platform 506 to move up and down, so that the shielding gas nozzle 507 and the retractable slider 508 are close to the printed part.

[0058] For further information, please refer to the attached manual. Figure 7-9 In an embodiment of the present invention, a device for precisely controlling heat during laser welding of heterogeneous additive parts is provided. The protective clamping device 6 also includes a closing plate 611, which is movably mounted on the rotating baffle 602. The closing plate 611 is used to close the laser welding head 4. Specifically, a supporting spring 612 is mounted on the closing plate 611, and the other end of the supporting spring 612 is mounted on the rotating baffle 602. It should be noted that in the embodiment of the present invention, the rotating baffle 602 closes the laser welding head 4 through the closing plate 611 when returning to its original position, and when the closing plate 611 returns to its original position, it is squeezed by the laser welding head 4, so that the supporting spring 612 is stressed, and then the closing plate 611 moves on the rotating baffle 602, ensuring that the closing plate 611 can close the laser welding head 4.

[0059] To be more specific, in the embodiment of the present invention, rotating frames 603 are installed on both sides of the rotating baffle 602, and the two rotating frames 603 are respectively rotatably installed on both sides of the socket 601; in addition, reset gears 607 are installed on the sides of the two rotating frames 603 that are away from each other, and two clamping rack frames 608 are respectively engaged with the two reset gears 607, and limiting grooves 610 are opened on both sides of the socket 601, and the two clamping rack frames 608 are respectively slidably installed in the two limiting grooves 610. It should be noted that, in the embodiment of the present invention, when the laser welding head 4 moves downward, the two clamping wheels 609 are respectively clamped on the LMD print 502 and the SLM print 503 to avoid deformation of the LMD print 502 and the SLM print 503 due to temperature changes during printing. At the same time, the clamping wheel 609 is forced to move and drive the clamping rack 608 to slide vertically in the limiting groove 610, so that the clamping rack 608 drives the reset gear 607 to rotate, and then the rotating baffle 602 is rotated and opened. At this time, the laser welding head 4 leaks out and welding can be performed. In the process of continuous movement and welding of the laser welding head 4, once it is separated from the print, the rotating baffle 602 can be returned to close the laser welding head 4 to avoid damage to the welding table 501 caused by continuous laser irradiation.

[0060] It should be emphasized that the closing plate 611 is made of stone or other materials that are not easily cut by laser, so as to block the laser when the laser is not turned off, thereby fully ensuring the safety of the welding station 501.

[0061] Please continue to refer to the instruction manual Figure 7-9 , more specifically, in the embodiment of the present invention, a rotation groove 605 is provided on both sides of the sleeve seat 601, a rotation shaft 604 is rotatably installed in the rotation groove 605, and the rotating frame 603 and the reset gear 607 are both sleeved on the rotation shaft 604; a rebound torsion spring 606 is installed on the inner wall of the rotation groove 605, and the other end of the rebound torsion spring 606 is installed on the rotation shaft 604;

[0062] In addition, a linkage socket 613 is sleeved on the socket 601, and the laser welding head 4 is inserted into the welding movable platform 506 through the linkage socket 613. It should be noted that in the embodiment of the present invention, when the reset gear 607 rotates, the rotating frame 603 is driven to rotate through the rotating shaft 604, thereby synchronously driving the opening of the rotating baffle 602, and the rotating shaft 604 rotates in the rotating groove 605, and drives the rebound torsion spring 606 to be stressed, so when the laser welding head 4 is reset, the rebound force of the rebound torsion spring 606 helps the rotating shaft 604 to reset, thereby facilitating the reset of the rotating baffle 602; when the laser welding head 4 moves down for welding, the linkage socket 613 is inserted into the welding movable platform 506, so that when the laser welding head 4 moves, the welding movable platform 506 is driven to move synchronously.

[0063] For further information, please refer to the attached manual. Figure 8-10 , the embodiment of the present invention provides a heat precision control device for the laser welding process of heterogeneous additive parts, the support cleaning device 7 also includes two linkage frames 710, and the two linkage frames 710 are respectively installed on the top sides of the two open frames 701; in addition, two adjustment rotating rods 705 are rotatably installed on one side of the rotating baffle 602, and the two adjustment rotating rods 705 are rotatably installed with transfer shafts 706, and the two transfer shafts 706 are respectively movably installed in the two linkage frames 710. It should be noted that in the embodiment of the present invention, when adjusting the distance between the two open frames 701, a synchronous gear 707 is rotated, so that the synchronous gear 707 drives the other synchronous gear 707 to rotate, and then drives the two adjustment rotating rods 705 to rotate, so that the two adjustment rotating rods 705 drive the two linkage frames 710 to move through the two transfer shafts 706, and the linkage frame 710 drives the open frame 701 to move, and the adjustment of the position of the open frame 701 is completed.

[0064] More specifically, in the embodiment of the present invention, the top ends of the two adjusting rotating rods 705 are both installed with synchronous gears 707, and the two synchronous gears 707 are meshed with each other; in addition, two gear shafts 708 are installed on one side of the rotating baffle 602, and the two synchronous gears 707 are respectively rotatably installed on the two gear shafts 708, and a locking nut 709 is threadedly installed on one gear shaft 708. It should be noted that in the embodiment of the present invention, during welding, the distance between the two support frames 701 is adjusted according to the position of the weld, and at this time, one synchronous gear 707 is rotated so that the synchronous gear 707 drives the other synchronous gear 707 to rotate in the opposite direction, and the two synchronous gears 707 rotate on the two gear shafts 708. At this time, the two synchronous gears 707 drive the two adjusting rotating rods 705 to rotate, so that the position of the support frame 701 can be adjusted. After the adjustment is completed, the locking nut 709 is tightened to lock the synchronous gear 707, and the position of the support frame 701 can be fixed.

[0065] Please continue to refer to the instruction manual Figure 8-10 More specifically, in the embodiment of the present invention, a return spring 703 is installed on the top side of the telescopic rod 702, and the top end of the return spring 703 is installed on the top inner wall of the open frame 701; an adjustment slot 704 is opened on the bottom side of the rotating baffle 602, and the open frame 701 is slidably installed in the adjustment slot 704. It should be noted that in the embodiment of the present invention, when the open frame 701 moves, it slides horizontally in the adjustment slot 704, and when the open frame 701 is unfolded, the telescopic rod 702 contacts and is squeezed with the welding table 501, thereby causing the telescopic rod 702 to retract in the open frame 701 and causing the return spring 703 to be stressed.

[0066] In summary, the working principle of the heat precision control device for the laser welding process of heterogeneous additive parts provided by the embodiment of the present invention is:

[0067] The water-cooled copper block 504 is installed at the lower part of the LMD print 502 to achieve rapid cooling of the LMD print 502 during the welding process; the heating copper block 505 is installed at the lower part of the SLM print 503 to achieve heating of the SLM print 503 before, during and after the welding process; the shielding gas in the shielding gas bottle 511 is input into the shielding gas nozzle 507 through the shielding gas pipe 513, and the nitrogen in the liquid nitrogen bottle 510 is input into the cavity of the welding movable platform 506 at the same time, the shielding gas is cooled to achieve continuous cooling of the shielding gas, and the cooled shielding gas reaches the surface of the welding molten pool through the shielding gas nozzle 507 to achieve protection and cooling of the welding process, so as to achieve the purpose of grain refinement of the weld; in addition, when the welding movable platform 506 moves, one side of the SLM print 503 is heated by the rotation of the welding rotary rolling heating head 509, so as to achieve rotary rolling and heating of the weld at the rear end of the molten pool, so as to further achieve the purpose of coarsening the weld grain;

[0068] Furthermore, when the laser welding head 4 moves down for welding, the laser welding head 4 drives the socket 601 to move, so that the linkage socket 613 can be inserted into the welding movable platform 506, and the laser welding head 4 can drive the welding movable platform 506 to move through the linkage socket 613 to ensure continuous control of the weld temperature. At the same time, when the laser welding head 4 moves down, the two clamping wheels 609 respectively clamp the LMD print 502 and the SLM print 503 to prevent the LMD print 502 and the SLM print 503 from printing. The deformation problem occurs due to temperature change, and the clamping wheel 609 is forced to move and drive the clamping rack 608 to slide vertically in the limiting groove 610, so that the clamping rack 608 drives the reset gear 607 to rotate, and the reset gear 607 rotates to drive the rotating shaft 604 to rotate in the rotating groove 605, and the rebound torsion spring 606 is stressed. At the same time, the rotating shaft 604 rotates to drive the rotating frame 603 to rotate, so that the rotating frame 603 drives the rotating baffle 602 to rotate and open. At this time, the laser welding head 4 leaks out and welding can be performed;

[0069] Furthermore, when the laser welding head 4 continues to move and detaches from the printed part, the pressure wheel 609 loses pressure. At this time, under the rebound force of the rebound torsion spring 606, the rotating shaft 604 drives the rotating baffle 602 to return to its original position through the rotating frame 603, and then drives the closing plate 611 to close the laser welding head 4, so as to avoid damage to the welding table 501 caused by continuous laser irradiation. At the same time, when the closing plate 611 returns to its original position, it is squeezed by the laser welding head 4, so that the closing plate 611 moves on the rotating baffle 602, ensuring that the closing plate 611 can close the laser welding head 4, and can also avoid the problem of the laser welding head 4 being damaged by collision during loading and unloading of printed parts or other unexpected situations. In addition, the closing plate 611 is made of stone or other materials that are not easily cut by laser, so as to ensure that the safety of the welding table 501 is fully guaranteed when the laser is not closed to a limited extent.

[0070] Furthermore, during welding, the distance between the two support frames 701 is adjusted according to the position of the weld. At this time, one synchronous gear 707 is rotated, so that the synchronous gear 707 drives the other synchronous gear 707 to rotate in the opposite direction. The two synchronous gears 707 rotate on the two gear shafts 708. At this time, the two synchronous gears 707 drive the two adjusting rods 705 to rotate, so that the two adjusting rods 705 drive the two linkage frames 710 to move through the two transfer shafts 706, and the linkage frames 710 drive the support frames 701 to move. Complete the adjustment of the position of the support frame 701; after the adjustment is completed, tighten the locking nut 709 to fix the position of the support frame 701, and when the rotating baffle 602 is unfolded, the two support frames 701 respectively drive the two telescopic rods 702 to contact the sides of the two printed parts, thereby supporting the weld and avoiding the problem of weld size changes caused by deformation of the printed parts. At the same time, when the rotating baffle 602 moves, it drives the support frame 701 and the telescopic rod 702 to move, so that the sides of the two printed parts can be cleaned, thereby ensuring the quality of welding.

[0071] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for accurately controlling heat during laser welding of heterogeneous additive parts, characterized in that: It comprises a welding machine body, a moving frame is mounted on the welding machine body, a lifting frame is mounted on the moving frame, and a laser welding head for welding is mounted on the bottom side of the lifting frame; It also includes a temperature control device, which is used to accurately control the heat of the welding process. The temperature control device includes a welding table, on which an LMD print and an SLM print are placed, and the laser welding head is used to weld the LMD print and the SLM print. A welding mobile table is provided above the welding table, and a shielding gas nozzle and a retractable slider are installed on the bottom side of the welding mobile table. A liquid nitrogen bottle and a shielding gas bottle are connected to one side of the shielding gas nozzle. The shielding gas nozzle sprays the cooled shielding gas on the surface of the welding molten pool to protect and cool the welding process. A welding rotary rolling heating head is installed on the bottom side of the retractable slider, and the welding rotary rolling heating head performs rotary rolling and heating on the weld at the rear end of the molten pool; It also includes a protective clamping device, which is installed on the laser welding head, and is used to protect the laser welding head and clamp the LMD print part and the SLM print part; the protective clamping device includes a socket, which is sleeved on the laser welding head, and a rotating baffle is rotatably installed on the bottom side of the socket, and the rotating baffle is used to close the laser welding head, and clamping racks are movably installed on both sides of the socket, and a clamping wheel is rotatably installed on one side of the clamping rack, and the two clamping wheels are used to press the LMD print part and the SLM print part; A supporting and cleaning device is installed on the protective clamping device, and the supporting and cleaning device is used to support the gap between the LMD print part and the SLM print part and clean the gap; the supporting and cleaning device includes two support frames, and the two support frames are movably installed on the bottom side of the rotating baffle, and a telescopic rod is movably installed on the bottom side of the support frame.

2. The device for accurately controlling heat during laser welding of heterogeneous additive parts according to claim 1, characterized in that: The temperature control device also includes a water-cooled copper block and a heating copper block, and the water-cooled copper block and the heating copper block are both embedded in the welding table; The water-cooled copper block and the heating copper block are respectively located on the bottom sides of the LMD printed part and the SLM printed part. The water-cooled copper block is used to cool the LMD printed part, and the heating copper block is used to heat the SLM printed part.

3. The device for accurately controlling heat during laser welding of heterogeneous additive parts according to claim 2, characterized in that: The protective gas cylinder is connected to a protective gas pipe, the protective gas pipe is connected to the protective gas nozzle, and a cavity is provided in the welding movable platform, and the protective gas pipe is located in the cavity of the welding movable platform; The liquid nitrogen bottle is connected with a liquid nitrogen delivery pipe, and the other end of the liquid nitrogen delivery pipe extends into the cavity of the welding movable platform, so as to cool down the protective gas pipe.

4. The device for accurately controlling heat during laser welding of heterogeneous additive parts according to claim 3 is characterized in that: Two lifting cylinders are installed on the bottom side of the welding movable platform, and the two lifting cylinders drive the welding movable platform to move up and down; Two slideways are arranged on the top side of the welding platform, and sliders are slidably installed in the two slideways, and the two sliders are respectively installed on the two lifting cylinders.

5. The device for precise heat control during laser welding of heterogeneous additive parts according to claim 1, characterized in that: The protective clamping device also includes a closing plate, which is movably mounted on the rotating baffle plate and is used to close the laser welding head; A support spring is installed on the closing plate, and the other end of the support spring is installed on the rotating baffle.

6. The device for precise heat control during laser welding of heterogeneous additive parts according to claim 5, characterized in that: A rotating frame is installed on both sides of the rotating baffle, and the two rotating frames are rotatably installed on the two sides of the sleeve seat respectively; A reset gear is installed on the side of the two rotating frames away from each other, and the two clamping rack frames are respectively engaged with the two reset gears. Limiting grooves are opened on both sides of the sleeve seat, and the two clamping rack frames are respectively slidably installed in the two limiting grooves.

7. The device for accurately controlling heat during laser welding of heterogeneous additive parts according to claim 6, characterized in that: A rotation groove is provided on both sides of the sleeve seat, a rotation shaft is rotatably installed in the rotation groove, and the rotating frame and the reset gear are both sleeved on the rotation shaft; A rebound torsion spring is installed on the inner wall of the rotating groove, and the other end of the rebound torsion spring is installed on the rotating shaft; A linkage socket is sleeved on the sleeve seat, and the laser welding head is inserted into the welding movable platform through the linkage socket.

8. The device for accurately controlling heat during laser welding of heterogeneous additive parts according to claim 1, characterized in that: The support and cleaning device further comprises two linkage frames, which are respectively mounted on the top sides of the two support frames; Two adjusting rotating rods are rotatably mounted on one side of the rotating baffle plate, and transfer shafts are rotatably mounted on the two adjusting rotating rods. The two transfer shafts are movably mounted in the two linkage frames respectively.

9. The device for precise heat control during laser welding of heterogeneous additive parts according to claim 8, characterized in that: The top ends of the two adjusting rotating rods are both equipped with synchronous gears, and the two synchronous gears are meshed with each other; Two gear shafts are installed on one side of the rotating baffle, and the two synchronous gears are rotatably installed on the two gear shafts respectively, and a locking nut is threadedly installed on one of the gear shafts.

10. The device for precise heat control during laser welding of heterogeneous additive parts according to claim 9, characterized in that: A return spring is installed on the top side of the telescopic rod, and the top end of the return spring is installed on the inner wall of the top side of the support frame; An adjusting groove is provided on the bottom side of the rotating baffle, and the support frame is slidably installed in the adjusting groove.

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