Tungsten electrode rotary welding gun for electric arc additive manufacturing

Abstract

The invention discloses a tungsten electrode rotary welding gun for electric arc additive manufacturing, and belongs to the technical field of additive manufacturing. The base is used for being connected with additive manufacturing equipment; the DD motor is fixed at the lower end of the base; the sliding sleeve assembly is connected to the lower end of the DD motor. The sliding sleeve assembly comprises a rotating sleeve driven by a DD motor. The upper end of the wire guide tube is fixed to the base, the lower end of the wire guide tube penetrates through the DD motor and the axis of the sliding sleeve, and the wire guide nozzle is fixed to the lower end of the wire guide tube. The tungsten electrode module is fixed at the lower end of the rotating sleeve; the tungsten electrode module comprises a tungsten needle matched with the wire guide nozzle; when the DD motor rotates, the tungsten needle rotates with the wire guide nozzle as the axis to form an annular heat source. The tungsten needle rotating with the wire guide nozzle as the axis provides an approximately annular heat source for the welding wire, coaxial feeding of the welding wire and the central axis of the welding gun avoids the problem that non-consumable electrode paraxial wire feeding arc additive depends on the wire feeding direction, is suitable for manufacturing multi-layer and complex-shape large components, and has the advantages of being flexible, efficient, high in precision and the like.

Description

Technical Field

[0001] The invention relates to the technical field of additive manufacturing, and in particular to a tungsten pole rotary welding gun used for arc additive manufacturing. Background Art

[0002] TIG arc additive manufacturing is a technology that uses tungsten inert gas welding as a heat source to deposit materials layer by layer. In this technology, the high-energy arc generated by the tungsten electrode is used as a heat source to melt the metal wire or powder layer by layer and deposit it onto the substrate. 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, low spatter, and high stability of organizational morphology, and is widely used.

[0003] The current TIG arc additive manufacturing welding gun chooses side-axis wire feeding. Different wire feeding conditions are changed according to the moving direction of the welding gun during the additive process, including front feeding, rear feeding and side feeding. In simple unidirectional deposition TIG welding, many studies have adopted the condition of feeding the wire from the front of the travel direction. Under the side wire feeding condition, the alignment position of the welding wire will be offset, which causes the position of the weld deposition to deviate from the center position of the welding gun. This directional 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 the deposition direction and the filling material direction in the side-axis feeding additive manufacturing when forming parts with nonlinear contours by adjusting the feeding direction; however, its disadvantages are: it requires an additional rotating axis and control system, and the path generation is complex, the implementation is difficult, the flexibility is low, and it is difficult to apply to the efficient additive of complex and large components. Summary of the invention

[0005] In view of the above-mentioned technical deficiencies, the present invention provides a tungsten electrode rotary welding gun for arc additive manufacturing, which is used to overcome the problem of non-melting electrode side-axis wire feeding arc additive manufacturing's dependence on wire feeding direction.

[0006] The present invention adopts the following technical solution: a tungsten electrode rotary welding gun for arc additive manufacturing, comprising: A base for connecting to the additive manufacturing equipment; A DD motor is fixed to the lower end of the base; A sleeve assembly connected to the lower end of the DD motor; the sleeve assembly includes a rotating sleeve driven by the DD motor; The wire guide tube is used to pass the welding wire; the upper end of the wire guide tube is fixed to the base, and the lower end of the wire guide tube passes through the axis of the DD motor and the sliding sleeve. A wire guide nozzle, fixed at the lower end of the wire guide tube, for threading the welding wire; The tungsten electrode module is fixed at the lower end of the rotating sleeve; the tungsten electrode module comprises a tungsten needle matched with the wire guide nozzle; when the DD motor rotates, the tungsten needle rotates with the wire guide nozzle as the axis to form an annular heat source.

[0007] It further comprises: a wire guide tube fixing block is fixed on the upper end of the base, and the upper end of the wire guide tube passes through the axis of the base and is fixed on the wire guide tube fixing block.

[0008] A hot wire is arranged on one side of the wire guide tube, and the lower end of the hot wire is connected to a hot wire fixing block fixed on the lower end of the wire guide tube.

[0009] The base is fixed with a hot wire cable quick plug for supplying power to the hot wire, a DD motor quick plug for supplying power to the DD motor, and a welding main power quick plug for supplying power to the tungsten electrode module.

[0010] The tungsten electrode module also includes: A connecting seat, fixed at the lower end of the rotating sleeve; A tungsten needle fixing block, fixedly connected to the tungsten needle via a conductive block; An adjustment plate, fixedly connected between the connection seat and the tungsten needle fixing block, for adjusting the inclination angle of the tungsten needle and the wire guide nozzle; The liquid cooling pipe joint is fixed on the tungsten needle fixing block and is communicated with the liquid cooling cavity inside the tungsten needle fixing block.

[0011] The sliding sleeve assembly further comprises a fixing sleeve, and the fixing sleeve is fixedly connected to the stator portion of the DD motor; The rotating sleeve is rotatably mounted in the fixed sleeve, and the rotating sleeve is fixedly connected to the rotor part of the DD motor.

[0012] A central shaft is fixed at the axial center position of the lower end of the base, and the lower end of the central shaft passes through the DD motor and the rotating sleeve; a plurality of axial holes for the wire guide tube and the hot wire to pass through are opened on the central shaft.

[0013] The rotating sleeve is provided with a guide ring, and an internal lead wire connected to the guide ring is passed through the rotating sleeve, and the internal lead wire is used to supply power to the tungsten electrode module; the fixed sleeve is provided with an external lead wire slidably connected to the guide ring.

[0014] The inner wall of the fixed sleeve is provided with a recessed groove, and an inner cavity is formed between the recessed groove and the outer wall of the rotating sleeve; sealed bearings are respectively installed between the upper and lower ends of the inner wall of the fixed sleeve and the outer wall of the rotating sleeve, and there are gaps between the upper and lower ends of the inner wall of the fixed sleeve and the outer wall of the rotating sleeve to connect the sealed bearings and the inner cavity; A first interface connected to the inner cavity is installed on the outer wall of the fixed sleeve; a second interface connected to the inner cavity is installed at the lower end of the rotating sleeve, and the second interface is used to provide cooling liquid to the tungsten electrode module.

[0015] The beneficial effects of the present invention are as follows: a tungsten needle rotating with the wire guide nozzle as the axis provides a near-annular heat source for the welding wire, and the welding wire is fed coaxially with the center axis of the welding gun, thereby avoiding the problem of non-melting electrode side-axis wire feeding arc additive's dependence on the wire feeding direction, avoiding complex path design, and realizing all-round additive. It can be applied to the manufacture of multi-layer and complex-shaped large components, and has the characteristics of flexibility, high efficiency and high precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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 these drawings without paying creative work.

[0017] Figure 1 A three-dimensional diagram of a tungsten electrode rotary welding gun for arc additive manufacturing provided in Example 1 of the present invention.

[0018] Figure 2 A front view of a tungsten electrode rotary welding gun for arc additive manufacturing provided in Example 1 of the present invention.

[0019] Figure 3 A three-dimensional diagram of a tungsten electrode module provided in Embodiment 1 of the present invention.

[0020] Figure 4 This is a main cross-sectional view of a tungsten electrode rotary welding gun for arc additive manufacturing provided in the second embodiment of the present invention.

[0021] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0022] Description of reference numerals: 1. Base; 11. Hot wire cable quick plug; 12. DD motor quick plug; 13. Welding main power quick plug; 2. DD motor; 21. stator part; 22. rotor part; 3. Sliding sleeve assembly; 31. Rotating sleeve; 32. Fixed sleeve; 33. Central shaft; 34. Guide ring; 341. Internal lead wire; 342. External lead wire; 35. Inner cavity; 351. First interface; 352. Second interface; 36. Sealed bearing; 4. Wire guide tube; 41. Wire guide tube fixing block; 5. Wire guide nozzle; 6. Tungsten electrode module; 61. Tungsten needle; 62. Connecting seat; 63. Tungsten needle fixing block; 64. Conductive block; 65. Adjustment plate; 66. Liquid cooling pipe joint; 7. Hot wire line; 71. Hot wire fixing block. DETAILED DESCRIPTION

[0023] 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.

[0024] Embodiment 1: like Figure 1 and Figure 2 As shown, the present invention provides a tungsten electrode rotary welding gun for 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 plug 11, a DD motor quick plug 12 and a welding main power quick plug 13. The DD motor 2 includes a stator part 21 and a rotor part 22, wherein the stator part 21 is fixed to the lower end of the base 1. The DD motor 2 is connected to the DD motor quick plug 12 via a cable, and power is supplied to the DD motor 2 via the DD motor quick plug 12. The sleeve assembly 3 is connected to the lower end of the DD motor 2, and the rotating sleeve 31 in the sleeve assembly 3 is fixedly connected to the rotor part 22 of the DD motor 2, and the rotating sleeve 31 is driven by 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.

[0025] The wire guide tube 4 is passed through the base 1, the DD motor 2 and the axis of the rotating sleeve 31. The wire guide tube fixing block 41 is fixed at the center position of the upper end of the base 1, and the upper end of the wire guide tube 4 passes through the axis of the base 1 and is fixed on the wire guide tube fixing block 41. The lower end of the wire guide tube 4 extends out of the rotating sleeve 31, and the wire guide nozzle 5 is fixed at the lower end of the wire guide tube 4. During operation, the welding wire passes through the wire guide tube 4 and the wire guide nozzle 5, and is fed to the workpiece according to a predetermined welding wire length. The hot wire line 7 is arranged on one side of the wire guide tube 4, and the lower end of the hot wire line 7 is connected to a hot wire fixing block 71, and the hot wire fixing block 71 is fixed to the lower end of the wire guide tube 4. The upper end of the hot wire line 7 is connected to the hot wire cable quick plug 11, and the hot wire line 7 is powered by the hot wire cable quick plug 11.

[0026] Recombination Figure 3As shown, the tungsten electrode module 6 is fixed at the lower end of the rotating sleeve 31. The tungsten electrode module 6 includes a connecting seat 62, and the connecting seat 62 is fixed at the lower end of the rotating sleeve 31. The adjustment plate 65 is connected between the connecting seat 62 and the tungsten needle fixing block 63 by bolts, and the tungsten needle 61 is fixed on the tungsten needle fixing block 63 by the conductive block 64. Before work, the inclination angle of the tungsten needle 61 relative to the central axis of the welding gun can be adjusted by loosening the adjustment plate 65 to adapt to the actual working conditions. The conductive block 64 is connected to the welding main power quick plug 13 through a cable, and the power supply to the tungsten needle 61 is realized through the welding main power quick plug 13, and finally transmitted to the welding workpiece. A liquid cooling chamber is arranged inside the tungsten needle fixing block 63, and the liquid cooling pipe joint 66 is fixed on the tungsten needle fixing block 63 and connected to the liquid cooling chamber; when working, the liquid cooling pipe joint 66 is connected to the external liquid cooling medium to realize the cooling of the tungsten needle fixing block 63 and the tungsten needle 61.

[0027] It can be seen from the above embodiments that the welding wire and the central axis of the welding gun are fed coaxially in the present invention, the tungsten electrode module 6 rotates rapidly under the drive of the DD motor 2, and the tungsten needle 61 in the tungsten electrode module 6 rotates with the wire guide nozzle 5 as the axis to form an annular heat source, completing the heating and melting of the welding wire, thereby realizing additive manufacturing. The present invention adopts the method of coaxial wire feeding and rotation of the tungsten needle 61, avoiding the problem of dependence of non-melting electrode side-axis wire feeding arc additive on wire feeding direction, and can be applied to the manufacture of multi-layer and complex-shaped large components.

[0028] Embodiment 2: Based on the above embodiment 1, combined with Figure 4 and Figure 5 As shown, this embodiment provides a sleeve assembly 3. The sleeve assembly 3 mainly includes a fixed sleeve 32 and a rotating sleeve 31. The sleeve assembly 3 also includes a fixed sleeve 32, the upper end of which is fixedly connected to the lower end of the stator part 21 of the DD motor 2 by bolts; the rotating sleeve 31 is fixedly connected to the lower end of the rotor part 22 of the DD motor 2 by a positioning pin. Driven by the DD motor 2, the rotating sleeve 31 rotates in the fixed sleeve 32.

[0029] A guide ring 34 is sleeved on the outer wall of the upper end of the rotating sleeve 31, and an axially arranged internal lead 341 is passed through the rotating sleeve 31, and the upper end of the internal lead 341 is connected to the guide ring 34; the lower end of the internal lead 341 is connected to the tungsten electrode module 6, which is used to supply power to the tungsten needle 61. A radial external lead 342 is passed through the upper end of the fixed sleeve 32, and the inner end of the external lead 342 is slidably connected to the guide ring 34 to ensure that the rotating sleeve 31 and the fixed sleeve 32 are powered during the rotation process; the outer end of the external lead 342 is connected to the welding main power supply quick plug 13, and finally connected to the external power supply.

[0030] The inner wall of the fixed sleeve 32 is provided with two recessed grooves, and a sealed inner cavity 35 is formed between the recessed grooves and the outer wall of the rotating sleeve 31. Two sealed bearings 36 are respectively installed at the upper and lower ends of the inner wall of the fixed sleeve 32 and the outer wall of the rotating sleeve 31 to realize the rotary connection between the rotating sleeve 31 and the fixed sleeve 32. The upper and lower ends of the inner cavity 35 are respectively connected to 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 connected to the corresponding inner cavity 35 are installed on the outer wall of the fixed sleeve 32, and the first interfaces 351 are connected to an external coolant source. Two second interfaces 352 connected to the corresponding inner cavity 35 are installed at the lower end of the rotating sleeve 31, and the second interfaces 352 are connected to the liquid cooling pipe joint 66 in the tungsten electrode module 6. During operation, the cooling oil in the coolant 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 returns to the coolant source through another set of the second interface 352 , the inner cavity 35 , and the first interface 351 .

[0031] Embodiment 3 Based on the above-mentioned embodiment 2, Figure 4 and Figure 5 As shown, in this embodiment, a central axis 33 is fixed at the axial position of the lower end of the base 1, and the lower end of the central axis 33 passes through the DD motor 2 and the rotating sleeve 31. The central axis 33 is provided with a plurality of axial holes for the wire guide tube 4 and the hot wire 7 to pass through. The lower end of the central axis 33 can be fixed with relevant detection elements, and the detection elements are connected to the upper computer through cables and the axial holes on the central axis 33.

[0032] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A tungsten electrode rotary welding gun for arc additive manufacturing, characterized in that: include: A base (1) for connecting to an additive manufacturing device; A DD motor (2) fixed at the lower end of the base (1); A sliding sleeve assembly (3) connected to the lower end of the DD motor (2); the sliding sleeve assembly (3) comprises a rotating sleeve (31) driven by the DD motor (2); The wire guide tube (4) is used to pass the welding wire; the upper end of the wire guide tube (4) is fixed to the base (1), and the lower end of the wire guide tube (7) passes through the axis of the DD motor (2) and the sliding sleeve (3). A wire guide nozzle (5) fixed at the lower end of the wire guide tube (4) and used for threading the welding wire; A tungsten electrode module (6) is fixed at the lower end of the rotating sleeve (31); the tungsten electrode module (6) comprises a tungsten needle (61) matched with the wire guide nozzle (4); when the DD motor (2) rotates, the tungsten needle (61) rotates with the wire guide nozzle (5) as the axis to form an annular heat source.

2. A tungsten electrode rotary welding gun for arc additive manufacturing according to claim 1, characterized in that: A wire guide tube fixing block (41) is fixed to the upper end of the base (1), and the upper end of the wire guide tube (4) passes through the axis of the base (1) and is fixed on the wire guide tube fixing block (41).

3. A tungsten electrode rotary welding gun for arc additive manufacturing according to claim 1, characterized in that: A hot wire (7) is provided on one side of the wire guide tube (4), and the lower end of the hot wire (7) is connected to a hot wire fixing block (71) fixed to the lower end of the wire guide tube (4).

4. A tungsten electrode rotary welding gun for arc additive manufacturing according to claim 3, characterized in that: The base (1) is fixed with a hot wire cable quick connector (11) for supplying power to the hot wire (7), a DD motor quick connector (12) for supplying power to the DD motor (2), and a welding main power quick connector (13) for supplying power to the tungsten electrode module (6).

5. The tungsten electrode rotary welding gun for arc additive manufacturing according to claim 1, characterized in that: The tungsten electrode module (6) further comprises: A connecting seat (62) fixed to the lower end of the rotating sleeve (31); A tungsten needle fixing block (63) fixedly connected to the tungsten needle (61) via a conductive block (64); An adjustment plate (65) fixedly connected between the connection seat (62) and the tungsten needle fixing block (63) and used for adjusting the inclination angle between the tungsten needle (61) and the wire guide nozzle (5); The liquid cooling pipe joint (66) is fixed on the tungsten needle fixing block (63) and is connected to the liquid cooling cavity inside the tungsten needle fixing block (63).

6. A tungsten electrode rotary welding gun for arc additive manufacturing according to claim 1, characterized in that: The sliding sleeve assembly (3) further comprises a fixing sleeve (32), wherein the fixing sleeve (32) is fixedly connected to the stator portion (21) of the DD motor (2); The rotating sleeve (31) is rotatably mounted in the fixed sleeve (32), and the rotating sleeve (31) is fixedly connected to the rotor part (22) of the DD motor (2).

7. A tungsten electrode rotary welding gun for arc additive manufacturing according to claim 6, characterized in that: A central shaft (33) is fixed at the axial center position of the lower end of the base (1), and the lower end of the central shaft (33) passes through the DD motor (2) and the rotating sleeve (31); the central shaft (33) is provided with a plurality of axial holes for the wire guide tube (4) and the hot wire (7) to pass through.

8. The tungsten electrode rotary welding gun for arc additive manufacturing according to claim 6, characterized in that: The rotating sleeve (31) is sleeved with a guide ring (34), and an internal lead wire (341) connected to the guide ring (34) is passed through the rotating sleeve (31), and the internal lead wire (341) is used to supply power to the tungsten electrode module (6); the fixed sleeve (32) is sleeved with an external lead wire (342) slidably connected to the guide ring (34).

9. The tungsten electrode rotary welding gun for arc additive manufacturing according to claim 6, characterized in that: The inner wall of the fixed sleeve (32) is provided with a recessed groove, and an inner cavity (35) is formed between the recessed groove and the outer wall of the rotating sleeve (31); a sealing bearing (36) is respectively installed between the upper and lower ends of the inner wall of the fixed sleeve (32) and the outer wall of the rotating sleeve (31); and a gap is respectively provided between the inner wall of the fixed sleeve (32) and the upper and lower ends of the outer wall of the rotating sleeve (31) to connect the sealing bearing (36) and the inner cavity (35); A first interface (351) connected to the inner cavity (35) is installed on the outer wall of the fixed sleeve (32); a second interface (352) connected to the inner cavity (35) is installed at the lower end of the rotating sleeve (31), and the second interface (352) is used to provide cooling liquid to the tungsten electrode module (6).

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