A tungsten electrode rotating welding gun for electric arc additive manufacturing

Abstract

The application discloses a tungsten electrode rotary welding gun for electric arc additive manufacturing and belongs to the technical field of additive manufacturing. The tungsten electrode rotary welding gun comprises a base for connecting an additive manufacturing device, a DD motor fixed at the lower end of the base, a sliding sleeve assembly connected at the lower end of the DD motor, the sliding sleeve assembly comprising a rotating sleeve driven by the DD motor, a wire guide tube with the upper end fixed to the base and the lower end penetrating the shaft center of the DD motor and the sliding sleeve, a wire guide nozzle fixed at the lower end of the wire guide tube, a tungsten electrode module fixed at the lower end of the rotating sleeve, the tungsten electrode module comprising a tungsten needle matched with the wire guide nozzle, and when the DD motor rotates, the tungsten needle rotates around the wire guide nozzle to form a ring-shaped heat source. The tungsten needle rotating around the wire guide nozzle provides a near-ring heat source for the welding wire, and the coaxial feeding of the welding wire and the central axis of the welding gun avoids the problem of the dependence of the non-melting electrode side-axis wire feeding electric arc additive manufacturing on the wire feeding direction, and the tungsten electrode rotary welding gun is suitable for manufacturing large components with multiple layers and complex shapes and has the characteristics of flexibility, high efficiency and high precision.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of additive manufacturing, in particular to a tungsten electrode rotary welding gun for arc additive manufacturing. BACKGROUND

[0002] TIG arc additive manufacturing is a technology that uses tungsten inert gas welding as a heat source to accumulate materials layer by layer. In this technology, the high-energy arc generated by the tungsten electrode serves as a heat source to melt and deposit metal wires or powders layer by layer on the substrate, and this process is carried out in a controlled protective atmosphere to avoid oxidation of the material. TIG arc additive manufacturing has the characteristics of low energy input, less spatter, stable microstructure morphology, etc., and is widely used.

[0003] The current TIG arc additive manufacturing welding gun selects a side-shaft wire feeder, and changes different wire feeding conditions according to the moving direction of the welding gun during the additive process, including forward feeding, backward feeding and side feeding. In simple one-way deposition TIG welding, many studies have adopted the condition of feeding the wire from the front of the travel direction. Under the condition of side feeding, the alignment position of the welding wire will be offset, which causes the deposition position of the weld to deviate from the center position of the welding gun. This direction dependence of the deposition process makes it difficult to achieve uniform and stable complex shapes in TIG welding.

[0004] A Chinese patent discloses an arc additive device and method with adjustable feeding direction (CN108971806A), which solves the problem of inconsistency between deposition direction and material filling direction when forming a part with a nonlinear contour by adjusting the feeding direction. However, it has the following disadvantages: an additional rotating shaft and control system are needed, the path generation is complex, the implementation is difficult, the flexibility is low, and it is difficult to apply to efficient additive manufacturing of complex large components. SUMMARY

[0005] In view of the above technical deficiencies, the present application provides a tungsten electrode rotary welding gun for arc additive manufacturing to overcome the dependence of non-consumable electrode side-shaft wire feeding arc additive on the wire feeding direction.

[0006] The present application adopts the following technical solution: a tungsten electrode rotary welding gun for arc additive manufacturing, comprising:

[0007] a base for connecting to an additive manufacturing device;

[0008] a DD motor fixed to the lower end of the base;

[0009] a sliding sleeve assembly connected to the lower end of the DD motor; the sliding sleeve assembly comprises a rotating sleeve driven by the DD motor;

[0010] A wire tube is used to pass the welding wire, the upper end of the wire tube is fixed with the base, and the lower end of the wire tube passes through the shaft of the DD motor and the sliding sleeve,

[0011] A wire nozzle is fixed at the lower end of the wire tube and is used to pass the welding wire.

[0012] A tungsten electrode module is fixed at the lower end of the rotating sleeve, the tungsten electrode module includes a tungsten needle matched with the wire nozzle, and the tungsten needle rotates around the wire nozzle to form a ring-shaped heat source when the DD motor rotates.

[0013] Further, the upper end of the base is fixed with a wire tube fixing block, and the upper end of the wire tube is fixed on the wire tube fixing block through the shaft of the base.

[0014] A hot wire line is arranged on one side of the wire tube, and a hot wire fixing block fixed at the lower end of the wire tube is connected to the lower end of the hot wire line.

[0015] The base is fixed with a hot wire cable quick connector for supplying power to the hot wire line, a DD motor quick connector for supplying power to the DD motor, and a welding main power quick connector for supplying power to the tungsten electrode module.

[0016] The tungsten electrode module further includes:

[0017] A connecting seat is fixed at the lower end of the rotating sleeve.

[0018] A tungsten needle fixing block is fixedly connected with the tungsten needle through a conductive block.

[0019] An adjusting plate is fixedly connected between the connecting seat and the tungsten needle fixing block, and is used to adjust the inclination angle of the tungsten needle and the wire nozzle.

[0020] A liquid cooling pipe joint is fixed on the tungsten needle fixing block and communicates with the liquid cooling cavity in the tungsten needle fixing block.

[0021] The sliding sleeve assembly further includes a fixing sleeve fixedly connected with the stator part of the DD motor.

[0022] The rotating sleeve is rotatably installed in the fixing sleeve, and the rotating sleeve is fixedly connected with the rotor part of the DD motor.

[0023] A middle shaft is fixed at the shaft position of the lower end of the base, the lower end of the middle shaft passes through the DD motor and the rotating sleeve, and a plurality of axial holes are formed in the middle shaft for the wire tube and the hot wire line to pass through.

[0024] A flow guide ring is sleeved on the rotating sleeve, an inner lead wire connected with the flow guide ring is arranged in the rotating sleeve, the inner lead wire is used to supply power to the tungsten electrode module, and an outer lead wire in sliding connection with the flow guide ring is arranged on the fixing sleeve.

[0025] The inner wall of the fixed sleeve is provided with a sink groove, and the sink groove and the outer wall of the rotating sleeve form an inner cavity; the upper and lower ends of the inner wall of the fixed sleeve and the outer wall of the rotating sleeve are respectively provided with sealing bearings, and the upper and lower ends of the inner wall of the fixed sleeve and the outer wall of the rotating sleeve are respectively provided with gaps communicating the sealing bearings and the inner cavity;

[0026] The outer wall of the fixed sleeve is provided with a first interface communicating with the inner cavity; the lower end of the rotating sleeve is provided with a second interface communicating with the inner cavity, and the second interface is used for providing the tungsten electrode module with cooling liquid.

[0027] The beneficial effects of the present application are that the tungsten needle rotating around the wire nozzle provides a near annular heat source for the welding wire, the coaxial feeding of the welding wire and the central axis of the welding gun avoids the dependence of the non-melted electrode off-axis wire feeding arc additive on the wire feeding direction, avoids complex path design, realizes omnidirectional additive manufacturing, can be applied to manufacturing multi-layer and complex large components, and has the characteristics of flexibility, efficiency and high precision. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0029] Figure 1 A perspective view of a tungsten electrode rotating welding gun for arc additive manufacturing provided by the first embodiment of the present application.

[0030] Figure 2 A front view of a tungsten electrode rotating welding gun for arc additive manufacturing provided by the first embodiment of the present application.

[0031] Figure 3 A perspective view of a tungsten electrode module provided by the first embodiment of the present application.

[0032] Figure 4 A front view of a tungsten electrode rotating welding gun for arc additive manufacturing provided by the second embodiment of the present application.

[0033] Figure 5 A perspective view of a tungsten electrode rotating welding gun for arc additive manufacturing provided by the second embodiment of the present application. Figure 4 An enlarged view of A in FIG.

[0034] BRIEF DESCRIPTION OF DRAWINGS

[0035] 1, base; 11, hot wire cable quick plug; 12, DD motor quick plug; 13, welding main power quick plug;

[0036] 2, DD motor; 21, stator part; 22, rotor part;

[0037] 3, sliding sleeve assembly; 31, rotating sleeve; 32, fixed sleeve; 33, middle shaft; 34, flow guide ring; 341, inner lead; 342, outer lead; 35, inner cavity; 351, first interface; 352, second interface; 36, sealing bearing;

[0038] 4, guide wire tube; 41, guide wire tube fixing block;

[0039] 5, guide wire nozzle;

[0040] 6, tungsten electrode module; 61, tungsten needle; 62, connecting seat; 63, tungsten needle fixing block; 64, conductive block; 65, adjusting plate; 66, liquid cooling pipe joint;

[0041] 7, hot wire line; 71, hot wire fixing block. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0043] Embodiment one:

[0044] As shown in Figure 1 and Figure 2 , the present application provides a tungsten electrode rotary welding gun for electric arc additive manufacturing. The base 1 is used to connect the additive manufacturing equipment, and the upper end of the base 1 is fixed with a hot wire cable quick connector 11, a DD motor quick connector 12 and a welding main power quick connector 13. The DD motor 2 includes a stator part 21 and a rotor part 22, wherein the stator part 21 is fixed at the lower end of the base 1. The DD motor 2 is connected to the DD motor quick connector 12 through a cable, and the DD motor 2 is powered through the DD motor quick connector 12. The sliding sleeve assembly 3 is connected at the lower end of the DD motor 2, and the rotating sleeve 31 in the sliding sleeve assembly 3 is fixedly connected with the rotor part 22 of the DD motor 2, and the rotating sleeve 31 is driven to rotate through the DD motor 2. During operation, the rotation speed of the rotating sleeve 31 can be controlled by adjusting the DD motor 2 in real time.

[0045] The guide wire tube 4 is arranged in the center of the base 1, the DD motor 2 and the rotating sleeve 31. The guide wire tube fixing block 41 is fixed to the upper end of the base 1, and the upper end of the guide wire tube 4 passes through the center of the base 1 and is fixed to the guide wire tube fixing block 41. The lower end of the guide wire tube 4 extends out of the rotating sleeve 31, and the guide wire nozzle 5 is fixed to the lower end of the guide wire tube 4. In operation, the welding wire passes through the guide wire tube 4 and the guide wire nozzle 5, and is supplied to the workpiece according to the predetermined welding wire length. The hot wire line 7 is arranged on one side of the guide wire tube 4, and the lower end of the hot wire line 7 is connected with the hot wire fixing block 71, and the hot wire fixing block 71 is fixed to the lower end of the guide wire tube 4. The upper end of the hot wire line 7 is connected to the hot wire cable quick connector 11, and the hot wire line 7 is powered through the hot wire cable quick connector 11.

[0046] Further combined Figure 3 As shown in the figure, the tungsten electrode module 6 is fixed to the lower end of the rotating sleeve 31. The tungsten electrode module 6 includes a connecting seat 62 fixed to the lower end of the rotating sleeve 31. The adjusting plate 65 is connected between the connecting seat 62 and the tungsten needle fixing block 63 through bolts, and the tungsten needle 61 is fixed to the tungsten needle fixing block 63 through the conductive block 64. Before operation, the inclination angle of the tungsten needle 61 relative to the central axis of the welding gun can be adjusted by loosening the adjusting plate 65 to adapt to the actual working condition requirements. The conductive block 64 is connected to the welding main power quick connector 13 through a cable, and the tungsten needle 61 is powered through the welding main power quick connector 13, and finally transmitted to the welding workpiece. A liquid cooling cavity is arranged in the tungsten needle fixing block 63, and a liquid cooling pipe joint 66 is fixed to the tungsten needle fixing block 63 and communicates with the liquid cooling cavity; in operation, the liquid cooling pipe joint 66 is connected to the external liquid cooling medium to cool the tungsten needle fixing block 63 and the tungsten needle 61.

[0047] As can be seen from the above embodiments, in the present application, the welding wire is coaxially fed with the central axis of the welding gun, the tungsten electrode module 6 is driven by the DD motor 2 to rotate quickly, the tungsten needle 61 in the tungsten electrode module 6 rotates around the guide wire nozzle 5 to form a ring-shaped heat source, the heating and melting of the welding wire is completed, and then the additive manufacturing is realized. The present application adopts the coaxial wire feeding and the rotating mode of the tungsten needle 61, which avoids the dependence of the non-melting electrode arc additive on the wire feeding direction, and can be applied to the manufacturing of multi-layer and complex-shaped large components.

[0048] Embodiment two:

[0049] On the basis of the above-mentioned embodiment one, further combined Figure 4 and Figure 5 As shown in the figure, the present embodiment provides a sliding sleeve assembly 3. The sliding sleeve assembly 3 mainly includes a fixed sleeve 32 and a rotating sleeve 31. The sliding sleeve assembly 3 further includes the fixed sleeve 32, the upper end of the fixed sleeve 32 is fixedly connected with the lower end of the stator part 21 of the DD motor 2 through bolts; the rotating sleeve 31 is fixedly connected with the lower end of the rotor part 22 of the DD motor 2 through a positioning pin. Under the driving of the DD motor 2, the rotating sleeve 31 rotates in the fixed sleeve 32.

[0050] The outer wall of the upper end of the rotating sleeve 31 is sleeved with a flow guide ring 34. An inner lead 341 is arranged axially in the rotating sleeve 31. The upper end of the inner lead 341 is connected with the flow guide ring 34. The lower end of the inner lead 341 is connected to the tungsten electrode module 6, for supplying power to the tungsten needle 61. The upper end of the fixed sleeve 32 is provided with a radial outer lead 342. The inner end of the outer lead 342 is slidably connected with the flow guide ring 34, so as to ensure the power supply during the rotation of the rotating sleeve 31 and the fixed sleeve 32. The outer end of the outer lead 342 is connected to the welding main power quick connector 13, and finally connected to the external power supply.

[0051] Two recesses are formed in the inner wall of the fixed sleeve 32, and the recesses and the outer wall of the rotating sleeve 31 form a sealed inner cavity 35. Two sealed bearings 36 are respectively arranged at the upper and lower ends of the inner wall of the fixed sleeve 32 and the outer wall of the rotating sleeve 31, so as to realize the rotary connection of the rotating sleeve 31 and the fixed sleeve 32. The upper and lower ends of the inner cavity 35 are respectively communicated with the two sealed bearings 36 through the gap between the inner wall of the fixed sleeve 32 and the outer wall of the rotating sleeve 31. During operation, the heat dissipation oil in the inner cavity 35 can partially enter the sealed bearings 36, which is helpful for the lubrication and cooling of the sealed bearings 36. Two first interfaces 351 are arranged on the outer wall of the fixed sleeve 32 and connected to the corresponding inner cavities 35. The first interfaces 351 are connected to the external cooling liquid source. Two second interfaces 352 are arranged on the lower end of the rotating sleeve 31 and connected to the liquid cooling pipe joint 66 in the tungsten electrode module 6. During operation, the cooling oil in the cooling liquid source is supplied to the rotating tungsten electrode module 6 through the first interface 351, the inner cavity 35 and the second interface 352, and then returned to the cooling liquid source through another set of second interface 352, inner cavity 35 and first interface 351.

[0052] Embodiment three

[0053] Based on the above-mentioned embodiment two, as shown in Figure 4 and Figure 5 In this embodiment, the lower end of the base 1 is fixed with a central shaft 33 at the shaft center position. The central shaft 33 passes through the DD motor 2 and the rotating sleeve 31. A plurality of axial holes are formed in the central shaft 33 for the guide wire tube 4 and the hot wire 7 to pass through. The lower end of the central shaft 33 can be fixed with relevant detection elements. The detection elements are connected to the upper computer through the cable and the axial holes on the central shaft 33.

[0054] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A tungsten electrode rotating welding gun for arc additive manufacturing, characterized in that, The utility model relates to a welding device for additive manufacturing equipment, which comprises a base (1) for connecting the additive manufacturing equipment, a DD motor (2) fixed at the lower end of the base (1), a sliding sleeve assembly (3) connected at the lower end of the DD motor (2), the sliding sleeve assembly (3) comprising a rotating sleeve (31) driven by the DD motor (2), a wire tube (4) for threading a welding wire, the upper end of the wire tube (4) being fixed to the base (1), the lower end of the wire tube (4) passing through the axis of the DD motor (2) and the rotating sleeve (31), a wire nozzle (5) fixed at the lower end of the wire tube (4) for threading the welding wire, a tungsten electrode module (6) fixed at the lower end of the rotating sleeve (31), the tungsten electrode module (6) comprising a tungsten needle (61) matched with the wire nozzle (5), when the DD motor (2) rotates, the tungsten needle (61) rotates around the wire nozzle (5) to form a ring-shaped heat source, the sliding sleeve assembly (3) further comprising a fixed sleeve (32) fixedly connected with the stator part (21) of the DD motor (2), the rotating sleeve (31) being rotatably installed in the fixed sleeve (32) and fixedly connected with the rotor part (22) of the DD motor (2), the inner wall of the fixed sleeve (32) being provided with a sink groove, the inner wall of the fixed sleeve (32) and the outer wall of the rotating sleeve (31) being provided with upper and lower sealing bearings (36) and gaps respectively, the outer wall of the fixed sleeve (32) being provided with a first interface (351) connected to the inner cavity (35), the lower end of the rotating sleeve (31) being provided with a second interface (352) connected to the inner cavity (35), the second interface (352) being used for providing cooling liquid to the tungsten electrode module (6), one side of the wire tube (4) being provided with a hot wire line (7), the lower end of the hot wire line (7) being connected with a hot wire fixing block (71) fixed at the lower end of the wire tube (4), the tungsten electrode module (6) further comprising a connecting seat (62) fixed at the lower end of the rotating sleeve (31), a tungsten needle fixing block (63) fixedly connected with the tungsten needle (61) through a conductive block (64), an adjusting plate (65) fixedly connected between the connecting seat (62) and the tungsten needle fixing block (63) and used for adjusting the inclination angle of the tungsten needle (61) and the wire nozzle (5), and a liquid cooling pipe joint (66) fixed on the tungsten needle fixing block (63) and connected with a liquid cooling cavity in the tungsten needle fixing block (63), the upper end of the base (1) being fixed with a wire tube fixing block (41), the upper end of the wire tube (4) passing through the axis of the base (1) and being fixed to the wire tube fixing block (41), the base (1) being fixed with a hot wire cable quick connector (11) used for supplying power to the hot wire line (7), a DD motor quick connector (12) used for supplying power to the DD motor (2), and a welding main power quick connector (13) used for supplying power to the tungsten electrode module (6). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. A tungsten electrode rotating welding gun for arc additive manufacturing according to claim 1, characterized in that: ​ 3. A tungsten electrode rotating welding gun for arc additive manufacturing according to claim 1, characterized in that: ​ 4. A tungsten electrode rotating welding gun for arc additive manufacturing according to claim 1, characterized in that: The shaft center position of the lower end of the base (1) is fixed with a middle shaft (33), the lower end of the middle shaft (33) penetrates through the DD motor (2) and the rotating sleeve (31); a plurality of axial holes are formed in the middle shaft (33) for the guide wire tube (4) and the hot wire line (7) to penetrate through.

5. A tungsten electrode rotating welding gun for arc additive manufacturing according to claim 1, characterized in that: The rotating sleeve (31) is sleeved with a flow guide ring (34), the rotating sleeve (31) is provided with an inner lead (341) connected with the flow guide ring (34), and the inner lead (341) is used for power supply to the tungsten electrode module (6); the fixed sleeve (32) is provided with an outer lead (342) in sliding connection with the flow guide ring (34).

Images