A wax pattern welding apparatus and method for a turbine guide vane

Abstract

The present application relates to the technical field of wax mold solid-state welding, and particularly relates to a turbine guide vane wax mold welding device and method. The device comprises a rotary table, a positioning disc, detachable pressing plates, an electric iron executor and a multi-degree-of-freedom manipulator. The positioning disc is installed on the output end of the rotary table. The positioning disc is provided with a positioning plane, an inner ring positioning structure for positioning the wax mold inner ring and an outer ring positioning structure for positioning the wax mold outer ring. A plurality of detachable pressing plates are installed on the positioning disc to tightly fix the wax mold inner ring and the wax mold outer ring on the positioning disc. The electric iron executor is arranged at the execution end of the multi-degree-of-freedom manipulator to heat and weld the blade with the wax mold inner ring and the wax mold outer ring. The multi-degree-of-freedom manipulator is used to drive the electric iron executor to move along a predetermined trajectory. The present application optimizes the welding path and pressing force through simulation to avoid deformation of the thin-walled part of the blade and is suitable for high-precision and high-efficiency welding of small-batch and multi-variety turbine guide vane wax molds.

Description

Technical Field

[0001] This invention relates to the field of solid-state welding technology for wax molds, and specifically to a wax mold welding device and method for a turbine guide. Background Technology

[0002] With the development of turbine guide vanes, the types and specifications of newly developed products are increasing, exhibiting characteristics of small batch sizes and strict requirements for airflow control. In traditional production methods, each specification requires a dedicated mold, leading to high mold costs. Furthermore, the varying skill levels of workers make it difficult to guarantee product consistency. In addition, significant differences in blade thickness can cause inconsistent dimensional shrinkage during manufacturing, especially with wax molds where the minimum thickness of the blade exhaust edge is only 0.1mm. This localized weakness in rigidity makes welding deformation difficult to control, severely impacting product quality. Therefore, there is an urgent need for a wax mold welding device and method for turbine guide vanes. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide a turbine guide and method to solve technical issues such as high mold costs, poor consistency of manual welding, and easy deformation of thin-walled blades during welding in small-batch, multi-variety production models.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This invention provides a wax mold welding device for a turbine guide, comprising a turntable, a positioning plate, multiple detachable pressure plates, a soldering iron actuator, and a multi-degree-of-freedom manipulator. The positioning plate is detachably mounted on the output end of the turntable, and its rotation axis is parallel to the ground. The positioning plate has a positioning plane, an inner ring positioning structure for positioning the inner ring of the wax mold, and an outer ring positioning structure for positioning the outer ring of the wax mold. Multiple detachable pressure plates are mounted on the positioning plate, and these plates are used to press and fix the inner and outer rings of the wax mold onto the positioning plate. The soldering iron actuator is located at the end of the multi-degree-of-freedom manipulator and is used to heat and weld the blades to the inner and outer rings of the wax mold. The multi-degree-of-freedom manipulator drives the soldering iron actuator to move along a predetermined trajectory.

[0006] The wax mold has multiple inner ring draft holes along its circumferential direction. One end of the blade has an inner ring curved draft platform. The inner ring curved draft platform and the inner ring draft holes are inserted to form a set of curved surface welding pairs with draft tapers.

[0007] The outer ring of the wax mold is provided with multiple outer ring draft holes along the circumferential direction, and the other end of the blade is provided with an outer ring curved draft platform. The outer ring curved draft platform and the outer ring draft holes are inserted to form another set of curved surface welding pairs with draft taper.

[0008] The draft taper is 1°.

[0009] The inner ring positioning structure includes an inner stop provided circumferentially on the positioning plane and a plurality of inner ring positioning pins located inside the inner stop, wherein the inner stop is fitted with the outer surface of the inner ring of the wax mold, and the plurality of inner ring positioning pins are respectively positioned and engaged with a plurality of inner ring positioning holes provided on the end face of the inner ring of the wax mold.

[0010] The outer ring positioning structure includes an outer stop disposed circumferentially on the positioning plane and a plurality of outer ring positioning pins located outside the outer stop. The outer stop is fitted with the inner surface of the outer ring of the wax model, and the plurality of outer ring positioning pins are respectively positioned and engaged with a plurality of outer ring positioning holes provided on the end face of the outer ring of the wax model. The outer stop and the inner stop are concentric ring structures.

[0011] The wax mold welding device for the turbine guide vane further includes a constant force micro cylinder disposed on the turntable, the constant force micro cylinder being used to press the blades between the inner ring and the outer ring of the wax mold.

[0012] The wax mold welding device for the turbine guide vane further includes a 3D non-contact scanning device for detecting the relative positional accuracy of the blade relative to the inner and outer rings of the wax mold.

[0013] Another aspect of the present invention provides a wax mold welding method for a turbine guide vane, which is implemented using the welding apparatus described above. The method includes the following steps:

[0014] Step S1: Position and connect the inner and outer rings of the wax mold to the positioning plate, keeping them coaxial, and then press the inner and outer rings of the wax mold together using the detachable pressure plate;

[0015] Step S2: Insert and press the blade between the inner ring and the outer ring of the wax mold;

[0016] Step S3: Use 3D non-contact scanning to check the pose of the blade;

[0017] Step S4: Control the soldering iron actuator to solder the connection between the blade and the outer ring of the wax mold;

[0018] Step S5: Control the soldering iron actuator to solder the connection between the blade and the inner ring of the wax mold;

[0019] Step S6: Control the turntable to rotate, and repeat steps S4 and S5 until all blades are welded.

[0020] Step S7: Disassemble the welded turbine guide wax mold.

[0021] In step S2, a constant force micro cylinder is used for pressing; the welding in steps S4 and S5 is solid welding, which is achieved by local heating to make the wax material reach a thermoplastic state and then fuse them together.

[0022] The motion trajectory and process parameters of the soldering iron actuator are pre-optimized through digital simulation to control welding stress and deformation.

[0023] The advantages and beneficial effects of this invention are as follows: The wax mold welding device and method for turbine guide vanes provided by this invention ensure the precise positioning and tight fit between the inner and outer rings of the wax mold and the blade by means of the positioning plane of the positioning plate and the inner and outer ring positioning structure of the inner and outer rings. The modular design is achieved by relying on the detachable connection between the positioning plate and the turntable, which is suitable for small-batch and multi-variety production and reduces tooling investment costs. The electric soldering iron actuator is driven by a multi-degree-of-freedom manipulator to move along a predetermined trajectory. With the subsequent adaptable constant force pressing, simulation optimization and other technologies, the risk of welding deformation in thin-walled parts of the blade is reduced, and the device has the advantages of firm clamping and flexible operation. It can meet the welding requirements of complex curved surfaces and achieve high-precision and high-efficiency welding.

[0024] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0025] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0026] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0027] Figure 1 This is a schematic diagram of the structure of a wax mold welding device for a turbine guide of the present invention;

[0028] Figure 2 for Figure 1 Enlarged view of a section at point I;

[0029] Figure 3 This is an isometric view of the wax model of the turbine guide in this invention;

[0030] Figure 4 This is an isometric view of the inner ring of the wax mold in this invention;

[0031] Figure 5 This is an isometric view of the outer ring of the wax mold in this invention;

[0032] Figure 6 This is an isometric view of the blade in this invention;

[0033] Figure 7 This is a top view of the blade in this invention;

[0034] Figure 8 for Figure 7 AA section view;

[0035] Figure 9 This is one of the schematic diagrams showing the working state of a wax mold welding device for a turbine guide according to the present invention;

[0036] Figure 10 for Figure 9 BB cross-sectional view;

[0037] Figure 11 for Figure 10 Enlarged view of a section in area II;

[0038] Figure 12 This is a second schematic diagram showing the working state of a wax mold welding device for a turbine guide of the present invention;

[0039] Figure 13 for Figure 12 CC section view;

[0040] Figure 14 for Figure 13 Enlarged view of section III in the middle.

[0041] In the diagram: 1. Inner ring of the wax model; 101. Draft face of the inner ring; 2. Outer ring of the wax model; 201. Draft face of the outer ring; 3. Blade; 301. Draft table of the inner ring curved surface; 302. Draft table of the outer ring curved surface; 303. Blade section; 304. Blade venting edge; 305. Blade fillet; 4. Turntable; 5. Positioning plate; 501. Positioning plane; 502. Outer stop; 503. Inner stop; 504. Outer ring positioning pin; 505. Inner ring positioning pin; 6. Removable pressure plate; 7. Soldering iron actuator. Detailed Implementation

[0042] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0044] See Figures 1 to 14 As shown, an embodiment of the present invention provides a wax mold welding device for a turbine guide. The wax mold of the turbine guide includes an inner ring 1, an outer ring 2, and multiple blades 3 connected between the inner ring 1 and the outer ring 2. The minimum thickness of the exhaust edge 304 of the blades is 0.1 mm. This device solves the problem of difficulty in controlling welding deformation due to local weak rigidity of the wax mold. The wax mold welding device for the turbine guide includes a turntable 4, a positioning plate 5, a detachable pressure plate 6, a soldering iron actuator 7, and a multi-degree-of-freedom manipulator. The positioning plate 5 is detachably mounted on the output end of the turntable 4. The rotation axis of the positioning plate 5 is parallel to the ground. The positioning plate 5 is provided with a positioning plane 501, an inner ring positioning structure for positioning the inner ring 1 of the wax mold, and an outer ring positioning structure for positioning the outer ring 2 of the wax mold. Multiple detachable pressure plates 6 are circumferentially mounted on the positioning plate 5. The multiple detachable pressure plates 6 are used to press and fix the inner ring 1 and the outer ring 2 of the wax mold onto the positioning plate 5. The soldering iron actuator 7 is located at the execution end of the multi-degree-of-freedom manipulator. The soldering iron actuator 7 is used to heat and weld the blade 3 to the inner ring 1 and the outer ring 2 of the wax mold. The multi-degree-of-freedom manipulator is used to drive the soldering iron actuator 7 to move along a predetermined trajectory.

[0045] See Figure 4 and Figure 5 As shown, the inner ring 1 of the wax model has multiple inner ring draft holes 101 along its circumferential direction, and the outer ring 2 of the wax model has multiple outer ring draft holes 201 along its circumferential direction.

[0046] See Figures 6 to 8 As shown, the blade 3 includes a blade portion 303 and an inner ring curved surface drafting table 301 and an outer ring curved surface drafting table 302 disposed at both ends of the blade portion 303. The side opposite to the blade exhaust edge 304 is the blade fillet 305. The inner ring curved surface drafting table 301 is inserted into the inner ring drafting curved surface 101 of the wax model inner ring 1 to form a set of curved surface welded assemblies with a draft taper. The outer ring curved surface drafting table 302 is inserted into the outer ring drafting curved surface 201 of the wax model outer ring 2 to form another set of curved surface welded assemblies with a draft taper. In this embodiment, the draft taper is 1° to ensure assembly accuracy.

[0047] See Figures 9 to 11As shown, in an embodiment of the present invention, the inner ring positioning structure includes an inner stop 503 circumferentially disposed on the positioning plane 501 and a plurality of inner ring positioning pins 505 located inside the inner stop 503. The inner stop 503 is fitted to the outer surface of the inner ring 1 of the wax model, and the plurality of inner ring positioning pins 505 are respectively positioned and engaged with a plurality of inner ring positioning holes provided on the end face of the inner ring 1 of the wax model. The outer ring positioning structure includes an outer stop 502 circumferentially disposed on the positioning plane 501 and a plurality of outer ring positioning pins 504 located outside the outer stop 502. The outer stop 502 is fitted to the inner surface of the outer ring 2 of the wax model, and the plurality of outer ring positioning pins 504 are respectively positioned and engaged with a plurality of outer ring positioning holes provided on the end face of the outer ring 2 of the wax model. The outer stop 502 and the inner stop 503 are concentric circular ring structures.

[0048] In this embodiment, the positioning plate 501 of the positioning disk 5, the inner and outer stops and the inner and outer ring positioning pins form a triple positioning structure. Combined with the tapered curved surface assembly design of the inner ring 1 and the blade 3 of the wax mold, and the outer ring 2 and the blade 3 of the wax mold, the precise positioning and tight fit of the inner ring 1, the outer ring 2 and the blade 3 of the wax mold are achieved. This avoids assembly deviations from the basic structure and provides a stable foundation for subsequent welding accuracy.

[0049] Furthermore, the wax mold welding device for the turbine guide includes a constant force micro cylinder mounted on the turntable 4. The constant force micro cylinder is used to press the blade 3 into the inner ring draft curve 101 of the inner ring 1 and the outer ring draft curve 201 of the outer ring 2 of the wax mold. The pressing force is determined by finite element software simulation to ensure that the pressing process will not cause plastic damage to the thin-walled blade portion 303 and the blade exhaust edge 304.

[0050] Furthermore, the wax mold welding device for the turbine guide includes a 3D non-contact scanning device. The 3D non-contact scanning device is used to scan the assembled wax mold to verify the relative position accuracy of the blade 3 relative to the inner ring 1 and outer ring 2 of the wax mold, so as to ensure the accuracy of the welding starting point.

[0051] Specifically, the positioning plate 5 can be disassembled at the output end of the turntable 4, facilitating the replacement of wax molds for other models of turbine guides. One positioning plate 5 corresponds to one specification of turbine guide wax mold, allowing for switching between different product models without the need to completely change the tooling. This significantly reduces tooling investment costs for multi-variety production and solves the problem of poor adaptability of traditional devices. The number of detachable pressure plates 6 is greater than or equal to three. During the welding process, depending on the welding process requirements, it is necessary to temporarily disassemble the detachable pressure plates 6 to avoid interference, ensuring both secure clamping and no interference with the welding operation.

[0052] In this embodiment, the soldering iron actuator 7 is a needle-type soldering iron actuator with heating and temperature control, whose heating temperature can be precisely controlled. The needle-type soldering iron actuator is driven by a six-degree-of-freedom manipulator, enabling flexible movement and adapting to the complex processing requirements of curved surface welding gaps. The welding path and process parameters (such as feed rate and heating depth) are pre-optimized based on wax model thermodynamic simulation and robot offline programming simulation, ensuring that the heat is precisely applied to the local area of ​​the welding gap, so that the wax material reaches a thermoplastic state and flows and fuses, achieving solid-state welding, greatly reducing the heat-affected zone, and effectively controlling welding stress and deformation.

[0053] During operation, the needle-type soldering iron actuator is activated. Following the simulation-optimized processing path, solid-state welding technology is used to weld the joint between the blade 3 and the outer ring 2 of the wax model. The heat from the needle-type soldering iron actuator causes the contact area of ​​the wax model to reach a thermoplastic state. The spatial trajectory movement of the needle-type soldering iron actuator achieves thermoplastic flow, completing the welding. Similarly, the needle-type soldering iron actuator is used to perform solid-state welding on the joint between the blade 3 and the inner ring 1 of the wax model. The positioner is controlled to drive the turntable 4 to rotate, sequentially rotating the remaining blades 3 to the welding station. The welding steps are repeated to complete the welding of all 23 blades 3. After welding, the removable pressure plate 6 is removed, and the welded turbine guide wax model is removed from the positioning plate 5, completing the welding process.

[0054] An embodiment of this invention provides a wax mold welding device for a turbine guide vane. It eliminates the need for blade surface contouring fixtures, achieving precise positioning through a positioning plate and a draft cone surface assembly, reducing mold investment costs and adapting to small-batch, multi-variety production. Finite element analysis software is used to simulate and determine constant force pressing parameters, combined with 3D non-contact scanning accuracy verification, ensuring no plastic deformation of the blades and improving the controllability of form and position tolerances. The welding path is optimized based on wax mold thermodynamic model simulation and robot offline programming simulation, and the temperature control function of the needle-type soldering iron actuator enables solid-state welding with a small heat-affected zone, avoiding welding stress deformation at the blade exhaust edge. The turntable and positioner work together to control the movement space of the needle-type soldering iron actuator within a small area, allowing for the use of smaller robots and reducing equipment costs. The blades are inserted from the outer edge of the wax mold ring, providing ample operating space, and eliminating the need for wax mold repair of the blades and blade fillets, avoiding confined space repair operations and significantly improving production efficiency.

[0055] See Figures 1 to 14 As shown, another embodiment of the present invention provides a wax mold welding method for a turbine guide, which is implemented using the welding apparatus described above, and specifically includes the following steps:

[0056] Step S1: Position and connect the inner ring 1 and outer ring 2 of the wax model to the positioning plate 5 and keep them coaxial. Then, press the inner ring 1 and outer ring 2 of the wax model with the detachable pressure plate 6.

[0057] Step S2: Insert and press the blade 3 between the inner ring 1 and the outer ring 2 of the wax mold;

[0058] Step S3: Use 3D non-contact scanning to check the pose of blade 3;

[0059] Step S4: Control the soldering iron actuator 7 to solder the connection between the blade 3 and the outer ring 2 of the wax mold;

[0060] Step S5: Control the soldering iron actuator 7 to weld the connection between the blade 3 and the inner ring 1 of the wax mold;

[0061] Step S6: Control the turntable 4 to rotate. The turntable 4 rotates at a preset angle to send the next blade 3 to the welding station. Repeat steps S4 and S5 until all blades 3 are welded.

[0062] Step S7: Disassemble the welded turbine guide wax mold.

[0063] Specifically, in step S1, according to the specifications of the wax model of the turbine guide to be welded, the corresponding positioning plate 5 is selected and installed on the turntable 4. The inner ring 1 of the wax model is placed on the positioning plate 5 so that it is fitted and positioned against the inner stop 503 and the inner ring positioning pin 505. Similarly, the outer ring 2 of the wax model is placed and fitted and positioned against the outer stop 502 and the outer ring positioning pin 504. Then, multiple detachable pressure plates 6 are used to press and fix the inner ring 1 and the outer ring 2 of the wax model onto the positioning plate 5.

[0064] Specifically, in step S2, the inner ring curved surface drafting table 301 and the outer ring curved surface drafting table 302 of the blade 3 are aligned with the inner ring drafting curved surface 101 and the outer ring drafting curved surface 201, respectively, and the blade 3 is smoothly pressed into place using a constant force micro cylinder (not shown in the figure, the force value is determined by simulation). This step is repeated to initially place all the blades 3 between the inner ring 1 and the outer ring 2 of the wax model.

[0065] Specifically, in step S3, the 3D non-contact scanning device is activated to scan the assembly, and the scanned data is compared with the three-dimensional digital model to verify whether the position and angle of each blade 3 are correct; if there is a deviation, fine-tuning can be performed.

[0066] After verification, the welding procedure is initiated. The welding in steps S4 and S5 is solid-state welding, achieved by localized heating to bring the wax to a thermoplastic state before fusion. Specifically, the six-degree-of-freedom robot, carrying a needle-type soldering iron actuator, moves to a predetermined starting point. The actuator heats to a set temperature, and the robot moves along a simulation-optimized path, causing the soldering iron tip to move along the gap between the blade 3 and the draft surface of the outer ring 2 of the wax mold, performing localized heating and solid-state welding (corresponding to step S4). See [link to relevant documentation]. Figure 11As shown. After completing the welding at this point, the six-degree-of-freedom robot then moves to the contact gap between the blade 3 and the inner ring 1 of the wax mold for welding (corresponding to step S5), see [link to step S5]. Figure 14 As shown, the motion trajectory and process parameters of the soldering iron actuator 7 are pre-optimized through digital simulation to control welding stress and deformation.

[0067] Another embodiment of the present invention provides a wax mold welding method for a turbine guide vane, employing solid-state welding technology, which results in a minimal heat-affected zone compared to liquid welding. Simultaneously, the welding path is optimized through wax mold thermodynamic model simulation, and the temperature control function of the needle-type soldering iron actuator precisely controls the heating range, preventing deformation of weak parts of the blades (such as the 0.1mm thick exhaust edge) due to thermal stress. The needle-type soldering iron actuator has a temperature control function, ensuring precise temperature control; coupled with a six-degree-of-freedom robot, it can achieve high-precision movement of complex spatial trajectories, adapting to the curved surface welding gap requirements of the blades and the inner and outer rings of the wax mold. The blades are assembled through draft taper curved surface assembly and precise positioning by a positioning plate, eliminating the need to design separate curved surface contouring tooling for different blade specifications. This significantly reduces the design, manufacturing, and maintenance costs of dedicated molds, solving the problem of excessive mold investment caused by multi-variety, small-batch production in traditional manufacturing.

[0068] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A wax pattern welding apparatus for a turbine guide vane comprising a turntable and a multi-degree-of-freedom robot, characterized by, Also comprising: a positioning disc, detachably mounted on the output end of the rotary table, the rotation axis of the positioning disc being parallel to the ground, the positioning disc being provided with a positioning plane, an inner ring positioning structure for positioning the inner ring of the wax mold, and an outer ring positioning structure for positioning the outer ring of the wax mold; a plurality of detachable pressing plates, mounted on the positioning disc, the plurality of detachable pressing plates being used to tightly fix the inner ring of the wax mold and the outer ring of the wax mold on the positioning disc; an electric soldering iron executor, provided at the execution end of the multi-degree-of-freedom manipulator, the electric soldering iron executor being used to heat and weld the blade with the inner ring of the wax mold and the outer ring of the wax mold; the multi-degree-of-freedom manipulator being used to drive the electric soldering iron executor to move along a predetermined trajectory; a plurality of inner ring demolding curved surface holes are provided on the inner ring of the wax mold along the circumference, one end of the blade is provided with an inner ring curved surface demolding table, the inner ring curved surface demolding table and the inner ring demolding curved surface hole are inserted to form a group of curved surface welding groups with demolding taper; a plurality of outer ring demolding curved surface holes are provided on the outer ring of the wax mold along the circumference, the other end of the blade is provided with an outer ring curved surface demolding table, the outer ring curved surface demolding table and the outer ring demolding curved surface hole are inserted to form another group of curved surface welding groups with demolding taper.

2. The wax pattern welding apparatus for a turbine guide vane of claim 1, wherein, The demolding taper is 1°.

3. The wax pattern welding apparatus for a turbine guide vane of claim 1, wherein, The inner ring positioning structure comprises an inner stop and a plurality of inner ring positioning pins located inside the inner stop, wherein the inner stop is fitted with the outer surface of the inner ring of the wax mold, and the plurality of inner ring positioning pins are respectively positioned and matched with the plurality of inner ring positioning holes provided on the end surface of the inner ring of the wax mold; The outer ring positioning structure comprises an outer stop and a plurality of outer ring positioning pins located outside the outer stop, wherein the outer stop is fitted with the inner surface of the outer ring of the wax mold, and the plurality of outer ring positioning pins are respectively positioned and matched with the plurality of outer ring positioning holes provided on the end surface of the outer ring of the wax mold; the outer stop and the inner stop are concentric ring structures.

4. The wax pattern welding apparatus for a turbine guide vane of claim 1, wherein, A constant force miniature air cylinder is further provided on the rotary table, which is used to press the blade to the inner ring of the wax mold and the outer ring of the wax mold.

5. The wax pattern welding apparatus for a turbine guide vane of claim 4, wherein, A 3D non-contact scanning device is further provided, which is used to detect the relative position accuracy of the blade relative to the inner ring of the wax mold and the outer ring of the wax mold.

6. A method of wax pattern welding of a turbine guide vane, characterized by The welding device of claim 5 is used to realize the method, which comprises the following steps: Step S1: position and connect the inner ring of the wax mold and the outer ring of the wax mold with the positioning disc, and keep the coaxial line, then tightly press the inner ring of the wax mold and the outer ring of the wax mold through the detachable pressing plate; Step S2: insert and press the blade to be fixed between the inner ring of the wax mold and the outer ring of the wax mold; Step S3: use the 3D non-contact scanning to check the pose of the blade; Step S4: control the electric soldering iron executor to weld the connecting part of the blade and the outer ring of the wax mold; Step S5: control the electric soldering iron executor to weld the connecting part of the blade and the inner ring of the wax mold; Step S6: control the rotary table to rotate, repeat step S4 and step S5 until the welding of all blades is completed; Step S7: disassemble the turbine guide vane wax mold formed by welding.

7. The wax pattern welding method of a turbine guide vane according to claim 6, characterized by, In step S2, a constant force micro-cylinder is used for pressing; the welding in steps S4 and S5 is solid-state welding, and the wax is fused after being heated locally to a thermoplastic state.

8. The wax pattern welding method of a turbine guide vane according to claim 7, characterized by, The movement trajectory and process parameters of the electric soldering iron executor are pre-optimized through digital simulation to control the welding stress and deformation.

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