Gas turbine guide vane welding fixture and clamping method

Abstract

This invention discloses a welding fixture for gas turbine guide vanes, comprising: a base, a first clamping mechanism, and a second clamping mechanism. The base has a sliding groove, and an angular positioning member is detachably connected to the base and is used to slide along the sliding groove. The working surface of the angular positioning member is aligned with the profile of the back surface of a second blade. The first clamping mechanism includes a first positioning part, a first tightening member, and a first clamping member. The first positioning part positions the first blade relative to the base, the first tightening member makes the blade facet of the first blade fit against the working surface of the angular positioning member, and the first clamping member fixes the first blade to the base. The second clamping mechanism includes a second positioning part, a second tightening member, and a second clamping member. The second positioning part positions the second blade relative to the base, the second tightening member makes the back surface of the second blade fit against the blade facet of the first blade, and the second clamping member fixes the second blade to the base.

Description

Technical Field

[0001] This invention relates to the technical field of aero-engine parts processing, and in particular, to a welding fixture for gas turbine guide vanes. Furthermore, this invention also relates to a clamping method comprising the aforementioned gas turbine guide vane welding fixture. Background Technology

[0002] like Figure 1 As shown, the gas turbine guide vane assembly of an aero-engine is welded together from a first blade and a second blade, as follows: Figure 2 As shown, the blade consists of upper and lower edge plates and a blade body. The inner curved surface of the upper edge plate is called the outer flow channel, and the inner curved surface of the lower edge plate is called the inner flow channel. After the first blade and the second blade are welded, the misalignment of the flow channel surfaces of the two blades is required to be no more than 0.3 mm.

[0003] Existing turbine guide vanes require separate machining of the first and second blades before welding. Specifically, the machining of the second blade involves five steps: first, machining the upper and lower edge plates on the blade head side; second, machining the upper and lower edge plates on the inlet side; third, machining the end faces of the upper and lower edge plates on the exhaust side; fourth, machining the upper and lower edge plates on the back side; and finally, machining the outer diameter pin plane of the upper edge plate. Correspondingly, the machining steps for the first blade are the same as for the second blade. After both the first and second blades are machined, they are clamped in a welding fixture for further machining. The first blade is positioned using its back surface and outer diameter reference surface, while the second blade is positioned using its blade head surface and outer diameter reference surface. Because the first and second blades are machined separately, their individual machining errors make it difficult to guarantee that the misalignment of the flow channel surfaces of the first and second blades will not exceed 0.3mm after welding. Furthermore, after welding, the outer diameter reference surface, edge plate side surfaces, and end faces of the blades need to be machined again to meet the final design dimensional requirements.

[0004] Existing processing methods are complex. The first and second blades require 10 processing steps before welding, necessitating the design of ten sets of fixtures to meet the blade processing requirements. This results in time-consuming, labor-intensive, and inefficient blade welding. Furthermore, due to individual processing errors in the first and second blades, it is difficult to guarantee that the misalignment of the blade flow channel surface will not exceed 0.3mm after welding. Summary of the Invention

[0005] This invention provides a welding fixture and clamping method for gas turbine guide vanes to solve the technical problems of how to reduce the pre-welding processing of the vanes, improve the welding efficiency of the vanes, and ensure that the misalignment of the flow channel surface of the vanes after welding is no more than 0.3 mm.

[0006] According to one aspect of the present invention, a gas turbine guide vane welding fixture is provided for clamping a first blade and a second blade respectively, such that the upper and lower edge sides of the blade head surface of the first blade are respectively fitted to the upper and lower edge sides of the blade back surface of the second blade. The bottom end face of the first blade has a first reference point, a second reference point, and a third reference point for positioning, and the bottom end of the second blade has a fourth reference point, a fifth reference point, and a sixth reference point for positioning. The gas turbine guide vane welding fixture includes: a base, a first clamping mechanism, and a second clamping mechanism. A sliding groove is provided on the base, and an angular positioning member is detachably connected to the base and is used to slide along the sliding groove. The working surface of the angular positioning member is used to conform to the contour of the blade back surface of the second blade. The first clamping mechanism is disposed on the base and includes a first positioning part, a first clamping member, and a first... The clamping member comprises a first positioning part for abutting against the first reference point, the second reference point, and the third reference point respectively, so as to position the first blade relative to the base; a first clamping member for clamping the back surface of the first blade so as to make the blade base surface of the first blade fit tightly against the working surface of the angular positioning member, so as to position the first blade angularly; and a first clamping member for fixing the first blade on the base. A second clamping mechanism is disposed on the base, and the second clamping mechanism includes a second positioning part, a second clamping member, and a second clamping member. The second positioning part is for abutting against the fourth reference point, the fifth reference point, and the sixth reference point respectively, so as to position the second blade relative to the base; the second clamping member is for clamping the blade base surface of the second blade so as to make the back surface of the second blade fit tightly against the blade base surface of the first blade; and the second clamping member is for fixing the second blade on the base.

[0007] Further, the first positioning part includes a first positioning pin, a second positioning pin, and a third positioning pin. The first positioning pin is fixed on the base and is used to abut against the first reference point. The second positioning pin is fixed on the base and is used to abut against the second reference point. The third reference point is fixed on the base and is used to abut against the third reference point. The second positioning part includes a fourth positioning pin, a fifth positioning pin, and a sixth positioning pin. The fourth positioning pin is fixed on the base and is used to abut against the fourth reference point. The fifth positioning pin is fixed on the base and is used to abut against the fifth reference point. The sixth reference point is fixed on the base and is used to abut against the sixth reference point.

[0008] Furthermore, the contact surfaces of the third locating pin and the sixth locating pin are both spherical curved surfaces.

[0009] Furthermore, the first tightening part includes a first support plate fixedly connected to the base, and a first tightening screw and a second tightening screw are spaced apart on the first support plate. The first tightening screw is used to abut against the side of the upper edge plate of the back surface of the first blade, and the second tightening screw is used to abut against the side of the lower edge plate of the back surface of the first blade. The second tightening part includes a second support plate fixedly connected to the base, and a third tightening screw and a fourth tightening screw are spaced apart on the second support plate. The third tightening screw is used to abut against the side of the upper edge plate of the blade basin surface of the second blade, and the second tightening screw is used to abut against the side of the lower edge plate of the blade basin surface of the second blade.

[0010] Furthermore, the first clamping part includes a first pressure plate and a second pressure plate. The first pressure plate is slidably connected to the base and is used to press against the upper edge plate surface of the back surface of the first blade. The second pressure plate is slidably connected to the base and is used to press against the lower edge plate surface of the back surface of the first blade. The second clamping part includes a third pressure plate and a fourth pressure plate. The third pressure plate is slidably connected to the base and is used to press against the upper edge plate surface of the back surface of the second blade. The fourth pressure plate is slidably connected to the base and is used to press against the lower edge plate surface of the back surface of the second blade.

[0011] Furthermore, the gas turbine guide vane welding fixture also includes an auxiliary support mechanism, which includes a first support member for vertically supporting the bottom of the upper edge plate on the back surface of the first blade and a second support member for vertically supporting the bottom of the upper edge plate on the back surface of the second blade.

[0012] Furthermore, the first support member includes a first push block, a first top block, and a first support pin. The first push block is slidably connected to the base. A first square elongated groove is formed on the first push block. The first support pin is fixedly connected to the top of the first top block. The middle part of the first top block cooperates with the first square elongated groove and moves vertically along the first square elongated groove. A first receiving cavity is formed on the base. The bottom plate of the first top block extends into the first receiving cavity and is threadedly connected to a first adjusting nut, which contacts the bottom of the first receiving cavity. The first adjusting nut controls the movement distance of the first top block along the vertical square so that the first support pin presses against the bottom of the upper edge plate on the back of the first blade.

[0013] Furthermore, the second support member includes a second push block, a second top block, and a second support pin. The second push block is slidably connected to the base, and a second square elongated groove is formed on the second push block. The second support pin is fixedly connected to the top of the second top block. The middle part of the second top block engages with the second square elongated groove and moves vertically along the second square elongated groove. A second receiving cavity is formed on the base. The bottom plate of the second top block extends into the second receiving cavity and is threadedly connected to a second adjusting nut, which contacts the bottom of the second receiving cavity. The first adjusting nut controls the movement distance of the second top block along the vertical square, so that the second support pin presses against the bottom of the upper edge plate on the back of the second blade.

[0014] Furthermore, the first push block has a first inclined surface, and the first top block has a second inclined surface that cooperates with the first inclined surface; the second push block has a third inclined surface, and the second top block has a fourth inclined surface that cooperates with the third inclined surface.

[0015] According to another aspect of the present invention, a method for welding and clamping a gas turbine guide vane is also provided, which uses the gas turbine guide vane welding fixture described above for clamping, and includes the following steps: S100, install the angular positioning component onto the base plate, and move the angular positioning component along the slide groove toward the first tightening part until it abuts against the support pin set on the base, and fix the angular positioning component on the base with bolts; S200, install the first blade, and position the first reference point, the second reference point and the third reference point through the first positioning part, while making the blade basin surface of the first blade fit against the working surface of the angular positioning part; S300, the first clamping member clamps the back surface of the first blade so that the blade basin surface of the first blade abuts against the working surface of the angular positioning member; S400, the first blade is fixed on the base by the first clamping member; S500, remove the angular positioning block from the base and install the second clamping member on the support base; S600, install the second blade, and position the fourth, fifth and sixth reference points through the second positioning part, while making the leaf basin surface of the first blade fit against the leaf back surface of the second blade. S700, the second clamping member clamps the blade basin surface of the second blade so that the back surface of the second blade abuts against the blade basin surface of the first blade. S800 uses a second clamping member to fix the second blade to the base, thereby completing the pre-welding clamping of the first and second blades.

[0016] The present invention has the following beneficial effects: In the gas turbine guide vane welding fixture and clamping method of the present invention, the welding fixture uses a first positioning part to position the blank reference point of the first blade, and then uses a first clamping member, a first holding member, and a first angular positioning member to clamp the first blade onto the base. Similarly, a second positioning part positions the blank reference point of the second blade, and then uses a second clamping member and a second holding member to clamp the second blade onto the base. Compared to the prior art, which requires five separate processing steps for the first and second blades before clamping, this method simplifies the process to only requiring processing of the welding surfaces of the first and second blades, specifically the blade head surface of the first blade and the blade back surface of the second blade. Since the blank reference point from the blade casting process is used for direct positioning, the misalignment of the flow channel surfaces of the two blades is guaranteed to be no more than 0.3 mm. This fixture simplifies the blade processing before welding and facilitates clamping, thereby improving the blade welding efficiency.

[0017] In specific implementation, the angular positioning component is installed on the base plate and moved along the slide groove towards the first tightening part until it abuts against the support pin set on the base. The angular positioning component is then fixed to the base with bolts. The first blade is installed, and the first, second, and third reference points are positioned by the first positioning part. Simultaneously, the blade base surface of the first blade is brought into contact with the working surface of the angular positioning component. The first tightening part presses against the back surface of the first blade, ensuring that the blade base surface of the first blade abuts against the working surface of the angular positioning component. The first clamping part fixes the first blade to the base, and a feeler gauge is used to secure it. Check whether each positioning point is in contact with the first blade to ensure stable clamping and accurate clamping position. Then remove the angular positioning block from the base and install the second clamping member on the support base. Install the second blade and position the fourth, fifth, and sixth reference points through the second positioning part. At the same time, make the blade basin surface of the first blade in contact with the blade back surface of the second blade. Use the second clamping member to press the blade basin surface of the second blade so that the blade back surface of the second blade is pressed against the blade basin surface of the first blade. Use the second clamping member to fix the second blade on the base, thus completing the pre-welding clamping of the first and second blades.

[0018] In summary, this invention simplifies the process flow before blade welding. Before welding the gas turbine guide vane assembly, the first and second blades each undergo five machining steps. This is simplified to only machining the welding surfaces of the first and second blades. Furthermore, it eliminates the need to design and manufacture ten sets of tooling to clamp the blades back and forth before welding. By using the precise blank reference points of the first and second blades for positioning and clamping, welding can be performed in the welding fixture. This effectively ensures that the misalignment of the flow channel surfaces of the first and second blades does not exceed 0.3mm, as required by the design, while also improving work efficiency and the pass rate of the machined parts.

[0019] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the welding structure of the first blade and the second blade of the present invention; Figure 2 This is a schematic diagram of the structure of the first blade of the present invention; Figure 3 This is a schematic diagram showing the distribution of reference points on the first blade and the second blade of the present invention; Figure 4 This is a schematic diagram of the installation of the angular positioning component according to a preferred embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a gas turbine guide vane welding fixture according to a preferred embodiment of the present invention; Figure 6 This is a top view of the structure of the gas turbine guide vane welding fixture according to a preferred embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the first support member in a preferred embodiment of the present invention.

[0021] Legend: 100. First blade; 101. First reference point; 102. Second reference point; 103. Third reference point; 104. Second blade; 105. Fourth reference point; 106. Fifth reference point; 107. Sixth reference point; 200. Base; 201. Slide groove; 300. Angular positioning component; 400. First locating pin; 401. Second locating pin; 403. Third locating pin; 404. Fourth locating pin; 405. Fifth locating pin; 406. Sixth locating pin; 500, First support plate; 501, First tightening screw; 502, Second tightening screw; 503, Second support plate; 504, Third tightening screw; 505, Fourth tightening screw; 600. First pressure plate; 601. Second pressure plate; 602. Third pressure plate; 603. Fourth pressure plate; 700, First push block; 701, First top block; 702, First support pin; 703, First rectangular groove; 704, First receiving cavity; 705, First inclined surface; 706, Second inclined surface; 707, First adjusting nut; 800, Second push block; 801, Second top block; 802, Second support pin. Detailed Implementation

[0022] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0023] like Figures 1-7 As shown, this embodiment of a gas turbine guide vane welding fixture is used to clamp a first blade 100 and a second blade 104 respectively, so that the upper and lower edge plates on the blade head surface of the first blade 100 are respectively fitted to the upper and lower edge plates on the blade back surface of the second blade 104. The bottom end face of the first blade 100 has a first reference point 101, a second reference point 102, and a third reference point 103 for positioning, and the bottom end of the second blade 104 has a fourth reference point 105 and a fifth reference point 106 for positioning. The gas turbine guide vane welding fixture includes a base 200, a first clamping mechanism, and a second clamping mechanism, with a sliding groove 201 on the base 200. An angular positioning member 300 is detachably connected to the base 200 and is used to slide along the sliding groove 201. The working surface of the angular positioning member 300 is aligned with the profile of the back surface of the second blade 104. The first clamping mechanism is disposed on the base 200 and includes a first positioning part, a first clamping member, and a first holding member. The first positioning part is used to abut against the first reference point 101, the second reference point 102, and the third reference point 103 respectively, so that the first blade 100 is positioned relative to the base 200. The first clamping member is used to clamp the back surface of the first blade 100 so that the blade basin surface of the first blade 100 is in close contact with the working surface of the angular positioning member 300, so that the first blade 100 is angularly positioned. The first clamping member is used to fix the first blade 100 on the base 200. The second clamping mechanism is disposed on the base. On the base 200, the second clamping mechanism includes a second positioning part, a second tightening member, and a second clamping member. The second positioning part is used to abut against the fourth reference point 105, the fifth reference point 106, and the sixth reference point 107 respectively, so that the second blade 104 is positioned relative to the base 200. The second tightening member is used to press against the blade surface of the second blade 104 so that the back surface of the second blade 104 is in close contact with the blade surface of the first blade 100. The second clamping member is used to fix the second blade 104 on the base 200.

[0024] like Figure 3As shown, the first reference point 101, the second reference point 102, the fourth reference point 105, and the fifth reference point 106 are all located on the end face of the blade's rim plate, while the third reference point 103 and the sixth reference point 107 are both located on the inner flow channel. These reference points are precise blank reference points used during blade casting and can be directly used as positioning references for blade machining. Therefore, the first and second positioning parts in this application are positioned with reference to these reference points. The angular positioning block is only used when clamping the first blade 100. Before clamping, the angular block is pushed along the base 200 until it is firmly against the support pin, and then the angular block is tightened with bolts. The contact surface between the angular block and the first blade is based on the dimensions of the back surface of the second blade 104, and this surface is welded with hard alloy to improve the wear resistance of the angular positioning block. The angular block is removed after the first blade 100 is clamped and pressed.

[0025] In this embodiment, the welding fixture uses a first positioning part to position the blank reference point of the first blade 100, and then uses a first clamping member, a first holding member, and a first angular positioning member 300 to clamp the first blade 100 onto the base 200. Similarly, a second positioning part positions the blank reference point of the second blade 104, and then uses a second clamping member and a second holding member to clamp the second blade 104 onto the base 200. Compared to the prior art, which requires five separate processing steps for the first blade 100 and the second blade 104 before clamping, this method simplifies the process to only require processing the welding surfaces of the first blade 100 and the second blade 104—specifically, the blade base surface of the first blade 100 and the blade back surface of the second blade 104. Since the blank reference point from the blade casting process is used for direct positioning, the misalignment of the two blade flow channel surfaces is guaranteed to be no more than 0.3mm. This fixture simplifies the blade processing before welding and facilitates clamping, thereby improving the blade welding efficiency.

[0026] In specific implementation, the angular positioning component 300 is installed on the base plate, and then moved along the slide groove 201 towards the first tightening part until it abuts against the support pin set on the base 200. The angular positioning component 300 is then fixed to the base 200 with bolts. The first blade 100 is installed, and the first reference point 101, the second reference point 102, and the third reference point 103 are positioned by the first positioning part. Simultaneously, the blade surface of the first blade 100 is brought into contact with the working surface of the angular positioning component 300. The first tightening member presses against the back surface of the first blade 100, so that the blade surface of the first blade 100 abuts against the working surface of the angular positioning component 300. The first clamping member fixes the first blade 100 to the base 200, and a plug is used to secure it. Check whether each positioning point is in contact with the first blade 100 to ensure stable clamping and accurate clamping position. Then remove the angular positioning block from the base 200 and install the second clamping member on the support base 200. Install the second blade 104 and position the fourth reference point 105, the fifth reference point 106, and the sixth reference point 107 through the second positioning part. At the same time, make the blade surface of the first blade 100 in contact with the back surface of the second blade 104. The blade surface of the second blade 104 is pressed by the second clamping member so that the back surface of the second blade 104 is pressed against the blade surface of the first blade 100. The second clamping member is used to fix the second blade 104 on the base 200, thereby completing the pre-welding clamping of the first blade 100 and the second blade 104.

[0027] In summary, this invention simplifies the process flow before blade welding. Before welding the gas turbine guide vane assembly, the first blade 100 and the second blade 104 each undergo five machining steps. This is simplified to only requiring machining of the welding surfaces of the first blade 100 and the second blade 104. Furthermore, it eliminates the need to design and manufacture ten sets of tooling to clamp the blades back and forth before welding. By using the precise blank reference points of the first blade 100 and the second blade 104 for positioning and clamping, welding can be performed in the welding fixture. This effectively ensures that the misalignment of the flow channel surfaces of the first blade 100 and the second blade 104 does not exceed 0.3mm as required by the design during welding, while also improving work efficiency and the pass rate of part processing.

[0028] Further, the first positioning part includes a first positioning pin 400, a second positioning pin 401, and a third positioning pin 403. The first positioning pin 400 is fixed to the base 200 and is used to abut against the first reference point 101. The second positioning pin 401 is fixed to the base 200 and is used to abut against the second reference point 102. The third reference point 103 is fixed to the base 200 and is used to abut against the third reference point 103. The second positioning part includes a fourth positioning pin 404, a fifth positioning pin 405, and a sixth positioning pin 406. The fourth positioning pin 404 is fixed to the base 200 and is used to abut against the fourth reference point 105. The fifth positioning pin 405 is fixed to the base 200 and is used to abut against the fifth reference point 106. The sixth reference point 107 is fixed to the base 200 and is used to abut against the sixth reference point 107.

[0029] In this embodiment, the first positioning pin 400 and the second positioning pin 401 are used to abut and position the first reference point 101 and the second reference point 102 of the upper and lower edge plates of the first blade 100, respectively. The third positioning pin 403 is used to position the third reference point 103 on the inner flow channel of the first blade 100. When designing the above positioning pins, it is necessary to perform three-dimensional calculation and fitting on the position so that the first blade 100 can be accurately positioned on the first positioning part, and to ensure that the position of the first positioning pin 400, the second positioning pin 401 and the third positioning pin 403 is within ±0.01mm in the dimension (restricting the degree of freedom of motion) of the first blade 100 in the direction of action, and within 0.02mm in the dimension (two position dimensions of the normal plane of the direction of action) of the first blade 100 in the direction of non-action. The fourth positioning pin 404 and the fifth positioning pin 405 are used to abut and position the fourth reference point 105 and the fifth reference point 106 on the upper and lower edge plates of the second blade 104, respectively. The sixth positioning pin 406 is used to position the sixth reference point 107 on the inner flow channel of the second blade 104. When designing the above positioning pins, it is necessary to perform three-dimensional calculation and fitting on the position so that the first blade 100 can be accurately positioned on the second positioning part, and to ensure that the position of the fourth positioning pin 404, the fifth positioning pin 405 and the sixth positioning pin 406 is within ±0.01mm in the dimension (restricting the degree of freedom of motion) of the second blade 104 in the direction of action, and within 0.02mm in the dimension (two position dimensions on the normal plane of the direction of action) of the second blade 104 in the direction of non-action.

[0030] Furthermore, the contact surfaces of the third positioning pin 403 and the sixth positioning pin 406 are both spherical curved surfaces. In this embodiment, the third positioning pin 403 and the sixth positioning pin 406 are designed as ball-headed pins, with the center of the ball located at the position of the new reference point. The third positioning pin 403 and the sixth positioning pin 406 are respectively installed on corresponding supports, which are mounted on the base 200 via a cylindrical shaft. A cylindrical pin is also designed on the support to restrict its orientation.

[0031] Further, the first tightening part includes a first support plate 500 fixedly connected to the base 200. A first tightening screw 501 and a second tightening screw 502 are spaced apart on the first support plate 500. The first tightening screw 501 is used to abut against the side of the upper edge plate of the back surface of the first blade 100, and the second tightening screw 502 is used to abut against the side of the lower edge plate of the back surface of the first blade 100. The second tightening part includes a second support plate 503 fixedly connected to the base 200. A third tightening screw 504 and a fourth tightening screw 505 are spaced apart on the second support plate 503. The third tightening screw 504 is used to abut against the side of the upper edge plate of the blade basin surface of the second blade 104, and the second tightening screw 502 is used to abut against the side of the lower edge plate of the blade basin surface of the second blade 104.

[0032] In this embodiment, the first support plate 500 is located on one side of the back surface of the first blade 100, and the second support plate 503 is located on one side of the leaf surface of the second blade 104. The first tightening screw 501 and the second tightening screw 502 on the first support plate 500 are used to tighten the upper edge plate side and the lower edge plate side of the back surface of the first blade 100, respectively, so that the first blade 100 moves closer to the second blade 104. The third tightening screw 504 and the fourth tightening screw 505 on the second support plate 503 are used to tighten the upper edge plate side of the leaf surface of the second blade and the lower edge plate side of the back surface of the first blade 100, respectively, so that the second blade 104 moves closer to the first blade 100, thereby enabling the first blade 100 and the second blade 104 to abut against each other.

[0033] Further, the first clamping part includes a first pressure plate 600 and a second pressure plate 601. The first pressure plate 600 is slidably connected to the base 200 and is used to press against the upper edge plate surface of the back surface of the first blade 100. The second pressure plate 601 is slidably connected to the base 200 and is used to press against the lower edge plate surface of the back surface of the first blade 100. The second clamping part includes a third pressure plate 602 and a fourth pressure plate 603. The third pressure plate 602 is slidably connected to the base 200 and is used to press against the upper edge plate surface of the back surface of the second blade 104. The fourth pressure plate 603 is slidably connected to the base 200 and is used to press against the lower edge plate surface of the back surface of the second blade 104.

[0034] In this embodiment, both the first pressure plate 600 and the second pressure plate 601 are slidably connected to the base 200 and can be locked with bolts. By pushing the first pressure plate 600 against the upper edge of the back surface of the first blade 100, and by pushing the second pressure plate 601 against the lower edge of the back surface of the first blade 100, the first blade 100 is clamped and fixed, facilitating the subsequent installation and positioning of the second blade 104 and helping to maintain a stable state during welding. Both the third pressure plate 602 and the fourth pressure plate 603 are slidably connected to the base 200 and can be locked with bolts. By pushing the third pressure plate 602 against the upper edge of the back surface of the second blade 104, and by pushing the fourth pressure plate 603 against the lower edge of the back surface of the second blade 104, the second blade 104 is clamped and fixed, helping to maintain a stable state during welding.

[0035] Furthermore, the gas turbine guide vane welding fixture also includes an auxiliary support mechanism. This auxiliary support mechanism includes a first support member for vertically supporting the bottom of the upper edge plate on the back surface of the first blade 100 and a second support member for vertically supporting the bottom of the upper edge plate on the back surface of the second blade 104. In this embodiment, by providing the first support member to vertically support the first blade 100 and the second support member to vertically support the second blade 104, the deformation force when the pressure plate presses the blade is overcome, ensuring the blade has a good working condition.

[0036] Further, the first support member includes a first push block 700, a first top block 701, and a first support pin 702. The first push block 700 is slidably connected to the base 200. A first square elongated groove 703 is provided on the first push block 700. The first support pin 702 is fixedly connected to the top of the first top block 701. The middle part of the first top block 701 cooperates with the first square elongated groove 703 and moves vertically along the first square elongated groove 703. A first receiving cavity 704 is provided on the base 200. The bottom plate of the first top block 701 extends into the first receiving cavity 704 and is threadedly connected to a first adjusting nut 707, which contacts the bottom of the first receiving cavity 704. The first adjusting nut 707 controls the moving distance of the first top block 701 along the vertical square so that the first support pin 702 presses against the bottom of the upper edge plate on the back of the first blade 100. In this embodiment, the first push block 700 is used to drive the first top block 701 to move on the surface of the base 200, so that the first top block 701 can approach the first blade 100. The first square groove 703 limits the range of motion of the first top block 701, so that the first top block 701 can only move along the length direction of the first square groove 703, and the height of the first top block 701 can be adjusted along the depth direction of the first square groove 703 by the first adjusting nut 707, thereby enabling the first support pin 702 to provide vertical support for the first blade 100.

[0037] Further, the second support member includes a second push block 800, a second top block 801, and a second support pin 802. The second push block 800 is slidably connected to the base 200. A second square elongated groove is provided on the second push block 800. The second support pin 802 is fixedly connected to the top of the second top block 801. The middle part of the second top block 801 cooperates with the second square elongated groove and moves vertically along the second square elongated groove. A second receiving cavity is provided on the base 200. The bottom plate of the second top block 801 extends into the second receiving cavity and is threadedly connected to a second adjusting nut, which contacts the bottom of the second receiving cavity. The first adjusting nut 707 controls the movement distance of the second top block 801 along the vertical square so that the second support pin 802 presses against the bottom of the upper edge plate on the back of the second blade 104. In this embodiment, the second push block 800 is used to drive the second top block 801 to move on the surface of the base 200, so that the second top block 801 can approach the second blade 104. The setting of the second square long groove limits the range of motion of the second top block 801, so that the second top block 801 can only move along the length direction of the second square long groove, and the height of the second top block 801 can be adjusted by the second adjusting nut along the depth direction of the second square long groove, thereby enabling the second support pin 802 to provide vertical support for the second blade 104.

[0038] Furthermore, the first push block 700 has a first inclined surface 705, and the first top block 701 has a second inclined surface 706 that cooperates with the first inclined surface 705; the second push block 800 has a third inclined surface, and the second top block 801 has a fourth inclined surface that cooperates with the third inclined surface. In this embodiment, the first inclined surface 705 and the second inclined surface 706 are provided to avoid the first blade 100, so that only the first support pin 702 provides vertical support for the first blade 100; the third and fourth inclined surfaces are provided to avoid the second blade 104, so that only the second support pin 802 provides vertical support for the second blade 104. Furthermore, with the cooperation of the first inclined surface 705 and the second inclined surface 706, when the first top block 701 moves vertically, the first push block 700 can continuously support the first top block 701 under the action of the first inclined surface 705. Correspondingly, the second push block 800 can continuously support the second top block 801 under the action of the third inclined plane.

[0039] According to another aspect of the present invention, a method for welding and clamping a gas turbine guide vane is also provided, which uses the gas turbine guide vane welding fixture described above for clamping, and includes the following steps: S100, install the angular positioning member 300 onto the base plate, and move the angular positioning member 300 along the slide groove 201 toward the first tightening part until it abuts against the support pin provided on the base 200, and fix the angular positioning member 300 onto the base 200 with bolts; S200, install the first blade 100, and position the first reference point 101, the second reference point 102 and the third reference point 103 through the first positioning part, while making the blade basin surface of the first blade 100 fit with the working surface of the angular positioning member 300. S300, the back surface of the first blade 100 is pressed against the first clamping member so that the blade basin surface of the first blade 100 abuts against the working surface of the angular positioning member 300. S400, the first blade 100 is fixed to the base 200 by the first clamping member; S500, remove the angular positioning block from the base 200 and install the second clamping member on the support base 200; S600, install the second blade 104, and position the fourth reference point 105, the fifth reference point 106 and the sixth reference point 107 through the second positioning part, while making the leaf basin surface of the first blade 100 fit with the leaf back surface of the second blade 104. S700, the second clamping member clamps the blade surface of the second blade 104 so that the back surface of the second blade 104 abuts against the blade surface of the first blade 100. S800, the second blade 104 is fixed on the base 200 by the second clamping member, thereby completing the pre-welding clamping of the first blade 100 and the second blade 104.

[0040] In this embodiment, for step S100, before clamping, the angular block is first pushed along the slide groove 201 until it is firmly against the support pin of the angular block, and then the angular block is tightened with bolts. The contact surface between the angular block and the first blade is based on the dimensions of the back surface of the second blade, and this surface is welded with hard alloy to improve the wear resistance of the angular positioning block. After the first blade is clamped and pressed, the angular block is removed. The lower end of the angular block and the base plate are positioned by a stop groove.

[0041] For step S200, the first positioning part includes a first positioning pin 400, a second positioning pin 401, and a third positioning pin 403 disposed on the base 200. The first positioning pin 400 and the second positioning pin 401 are used to abut and position the first reference point 101 and the second reference point 102 of the upper edge plate and the lower edge plate of the first blade 100, respectively. The third positioning pin 403 is used to position the third reference point 103 on the inner flow channel of the first blade 100. When designing the above positioning pins, it is necessary to perform three-dimensional calculation and fitting of the position so that the first blade 100 can be accurately positioned on the first positioning part, and to ensure that the position of the first positioning pin 400, the second positioning pin 401, and the third positioning pin 403 is within ±0.01mm in the dimension (restricting the degree of freedom of motion) of the first blade 100 in the direction of action, and within 0.02mm in the dimension (two position dimensions of the normal plane of the direction of action) of the first blade 100 in the direction of non-action.

[0042] For step S300, the first tightening part includes a first support plate 500 fixedly connected to the base 200. The first support plate 500 is provided with a first tightening screw 501 and a second tightening screw 502 at intervals. The first support plate 500 is located on one side of the back surface of the first blade 100, and the second support plate 503 is located on one side of the leaf surface of the second blade 104. The first tightening screw 501 and the second tightening screw 502 on the first support plate 500 are respectively used to tighten the upper edge plate side and the lower edge plate side of the back surface of the first blade 100, thereby causing the first blade 100 to move closer to the second blade 104, so that the leaf surface of the first blade 100 abuts against the working surface of the angular positioning member 300.

[0043] For step S400, before clamping the first blade 100 with the first clamping member, the first blade 100 needs to be further supported. Specifically, the first push block 700 drives the first top block 701 to move on the surface of the base 200, so that the first top block 701 can get close to the first blade 100. The setting of the first square long groove 703 limits the range of motion of the first top block 701, so that the first top block 701 can only move along the length direction of the first square long groove 703, and the height of the first top block 701 can be adjusted along the depth direction of the first square long groove 703 by the first adjusting nut 707, so that the first support pin 702 provides vertical support for the first blade 100. The first clamping component includes a first pressure plate 600 and a second pressure plate 601. Both the first pressure plate 600 and the second pressure plate 601 are slidably connected to the base 200 and can be locked with bolts. By pushing the first pressure plate 600 against the upper edge of the back surface of the first blade 100, and by pushing the second pressure plate 601 against the lower edge of the back surface of the first blade 100, the first blade 100 is clamped and fixed, facilitating the subsequent installation and positioning of the second blade 104 and ensuring a stable state during welding. After the first blade 100 is installed and positioned, a feeler gauge is used to check each positioning point of the first blade 100 to ensure good contact between the first blade 100 and each positioning support point, thereby ensuring accurate installation and positioning of the first blade 100.

[0044] For step S500, after the first blade 100 is positioned, the angular positioning member 300 needs to be disassembled and the second clamping member needs to be installed so as to clamp the second blade 104.

[0045] For step S600, the second positioning part includes a fourth positioning pin 404, a fifth positioning pin 405, and a sixth positioning pin 406. The fourth positioning pin 404 and the fifth positioning pin 405 are used to abut and position the fourth reference point 105 and the fifth reference point 106 on the upper and lower edge plates of the second blade 104, respectively. The sixth positioning pin 406 is used to position the sixth reference point 107 on the inner flow channel of the second blade 104. When designing the above positioning pins, it is necessary to perform three-dimensional calculation and fitting on the position so that the first blade 100 can be accurately positioned on the second positioning part, and to ensure that the position of the fourth positioning pin 404, the fifth positioning pin 405, and the sixth positioning pin 406 is within ±0.01mm in the dimensional tolerance of the second blade 104 in the direction of action (restricting the degree of freedom of motion), and within 0.02mm in the dimensional tolerance of the second blade 104 in the non-direction of action (the two positional dimensions of the normal plane in the direction of action).

[0046] For step S700, the second clamping member includes a second support plate 503 and a third clamping screw 504 and a fourth clamping screw 505 disposed on the second support plate 503. The third clamping screw 504 and the fourth clamping screw 505 on the second support plate 503 are respectively used to clamp the upper edge plate side of the blade basin surface of the second blade and the lower edge plate side of the blade back surface of the first blade 100, thereby causing the second blade 104 to move closer to the first blade 100, so that the first blade 100 and the second blade 104 can abut against each other.

[0047] For step S800, before clamping the second blade 104 with the second clamping member, the second blade 104 needs to be further supported. Specifically, the second push block 800 drives the second top block 801 to move on the surface of the base 200, so that the second top block 801 can approach the second blade 104. The setting of the second square groove limits the range of motion of the second top block 801, so that the second top block 801 can only move along the length direction of the second square groove and the height of the second top block 801 can be adjusted by the second adjusting nut along the depth direction of the second square groove, so that the second support pin 802 provides vertical support for the second blade 104. The second clamping component includes a second pressure plate 601 and a second pressure plate 602. Both the second pressure plate 601 and the second pressure plate 602 are slidably connected to the base 200 and can be locked with bolts. By pushing the second pressure plate 601 against the upper edge of the back surface of the second blade 104, and by pushing the second pressure plate 601 against the lower edge of the back surface of the second blade 104, the second blade 104 is clamped and fixed, facilitating subsequent installation and positioning of the second blade 104 and ensuring a stable state during welding. After the second blade 104 is installed and positioned, a feeler gauge is used to check each positioning point of the second blade 104 to ensure that the second blade 104 fits well with each positioning support, thereby ensuring accurate installation and positioning of the second blade 104.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A welding clamping method for a gas turbine guide vane, employing a gas turbine guide vane welding fixture for clamping a first vane (100) and a second vane (104) respectively, so that the upper edge plate side and lower edge plate side of the blade head surface of the first vane (100) are respectively fitted to the upper edge plate side and lower edge plate side of the blade back surface of the second vane (104), wherein the bottom end face of the first vane (100) has a first reference point (101), a second reference point (102) and a third reference point (103) for positioning, and the bottom end of the second vane (104) has a fourth reference point (105), a fifth reference point (106) and a sixth reference point (107) for positioning, characterized in that, The gas turbine guide vane welding fixture includes: A base (200) is provided with a sliding groove (201). An angular positioning member (300) is detachably connected to the base (200) and the angular positioning member (300) is used to slide along the sliding groove (201). The working surface of the angular positioning member (300) is used to match the profile of the back surface of the second blade (104). A first clamping mechanism is disposed on the base (200). The first clamping mechanism includes a first positioning part, a first pressing member, and a first clamping member. The first positioning part is used to abut against the first reference point (101), the second reference point (102), and the third reference point (103) respectively, so that the first blade (100) is positioned relative to the base (200). The first pressing member is used to press against the back surface of the first blade (100) so that the blade surface of the first blade (100) is in contact with the working surface of the angular positioning member (300) so that the first blade (100) is angularly positioned. The first clamping member is used to fix the first blade (100) on the base (200). The second clamping mechanism is disposed on the base (200). The second clamping mechanism includes a second positioning part, a second pressing member, and a second clamping member. The second positioning part is used to abut against the fourth reference point (105), the fifth reference point (106), and the sixth reference point (107) respectively, so that the second blade (104) is positioned relative to the base (200). The second pressing member is used to press against the blade surface of the second blade (104) so ​​that the blade back surface of the second blade (104) is in close contact with the blade surface of the first blade (100). The second clamping member is used to fix the second blade (104) on the base (200). The welding and clamping method for the gas turbine guide vanes includes the following steps: S100, install the angular positioning member (300) onto the base plate, and move the angular positioning member (300) along the slide groove (201) toward the first clamping member until the angular positioning member (300) abuts against the support pin provided on the base (200), and fix the angular positioning member (300) on the base (200) with bolts; S200, install the first blade (100), and position the first reference point (101), the second reference point (102) and the third reference point (103) through the first positioning part, while making the blade basin surface of the first blade (100) fit with the working surface of the angular positioning part (300); S300, the back surface of the first blade (100) is pressed against the first clamping member so that the blade surface of the first blade (100) abuts against the working surface of the angular positioning member (300); S400, the first blade (100) is fixed on the base (200) by the first clamping member; S500, remove the angular positioning block from the base (200) and install the second clamping member onto the base (200); S600, install the second blade (104), and position the fourth reference point (105), the fifth reference point (106) and the sixth reference point (107) through the second positioning part, while making the leaf basin surface of the first blade (100) fit against the leaf back surface of the second blade (104); S700, the blade basin surface of the second blade (104) is pressed against the second clamping member so that the back surface of the second blade (104) is pressed against the blade basin surface of the first blade (100). S800, the second blade (104) is fixed on the base (200) by the second clamping member, thereby completing the pre-welding clamping of the first blade (100) and the second blade (104).

2. The welding and clamping method for gas turbine guide vanes according to claim 1, characterized in that, The first positioning part includes a first positioning pin (400), a second positioning pin (401) and a third positioning pin (403). The first positioning pin (400) is fixed on the base (200) and is used to abut against the first reference point (101). The second positioning pin (401) is fixed on the base (200) and is used to abut against the second reference point (102). The third reference point (103) is fixed on the base (200) and is used to abut against the third reference point (103). The second positioning part includes a fourth positioning pin (404), a fifth positioning pin (405), and a sixth positioning pin (406). The fourth positioning pin (404) is fixed on the base (200) and is used to abut against the fourth reference point (105). The fifth positioning pin (405) is fixed on the base (200) and is used to abut against the fifth reference point (106). The sixth reference point (107) is fixed on the base (200) and is used to abut against the sixth reference point (107).

3. The welding and clamping method for gas turbine guide vanes according to claim 2, characterized in that, The contact surfaces of the third positioning pin (403) and the sixth positioning pin (406) are both hemispherical curved surfaces.

4. The welding and clamping method for gas turbine guide vanes according to claim 1, characterized in that, The first clamping member includes a first support plate (500) fixedly connected to the base (200). A first clamping screw (501) and a second clamping screw (502) are spaced apart on the first support plate (500). The first clamping screw (501) is used to abut against the side of the upper edge plate of the blade back surface of the first blade (100), and the second clamping screw (502) is used to abut against the side of the lower edge plate of the blade back surface of the first blade (100). The second clamping member includes a second support plate (503) fixedly connected to the base (200). A third clamping screw (504) and a fourth clamping screw (505) are spaced apart on the second support plate (503). The third clamping screw (504) is used to abut against the side of the upper edge plate of the blade basin surface of the second blade (104), and the fourth clamping screw (505) is used to abut against the side of the lower edge plate of the blade basin surface of the second blade (104).

5. The welding and clamping method for gas turbine guide vanes according to claim 1, characterized in that, The first clamping member includes a first pressure plate (600) and a second pressure plate (601). The first pressure plate (600) is slidably connected to the base (200) and is used to press against the upper edge plate of the back surface of the first blade (100). The second pressure plate (601) is slidably connected to the base (200) and is used to press against the lower edge plate of the back surface of the first blade (100). The second clamping member includes a third pressure plate (602) and a fourth pressure plate (603). The third pressure plate (602) is slidably connected to the base (200) and is used to press against the upper edge plate of the back surface of the second blade (104). The fourth pressure plate (603) is slidably connected to the base (200) and is used to press against the lower edge plate of the back surface of the second blade (104).

6. The welding and clamping method for gas turbine guide vanes according to claim 1, characterized in that, The gas turbine guide vane welding fixture also includes an auxiliary support mechanism, which includes a first support member for vertically supporting the bottom of the upper edge plate on the back surface of the first blade (100) and a second support member for vertically supporting the bottom of the upper edge plate on the back surface of the second blade (104).

7. The welding and clamping method for gas turbine guide vanes according to claim 6, characterized in that, The first support member includes a first push block (700), a first top block (701), and a first support pin (702). The first push block (700) is slidably connected to the base (200). A first square elongated groove (703) is formed on the first push block (700). The first support pin (702) is fixedly connected to the top of the first top block (701). The middle part of the first top block (701) engages with the first square elongated groove (703) and moves vertically along the first square elongated groove (703). The base (200) has a first receiving cavity (704). The bottom plate of the first top block (701) extends into the first receiving cavity (704) and is threadedly connected to a first adjusting nut (707), so that the first adjusting nut (707) contacts the bottom of the first receiving cavity (704). The first adjusting nut (707) controls the first top block (701) to move a distance along a vertical square so that the first support pin (702) presses against the bottom of the upper edge plate on the back of the first blade (100).

8. The welding and clamping method for gas turbine guide vanes according to claim 7, characterized in that, The second support member includes a second push block (800), a second top block (801), and a second support pin (802). The second push block (800) is slidably connected to the base (200). A second square long groove is provided on the second push block (800). The second support pin (802) is fixedly connected to the top of the second top block (801). The middle part of the second top block (801) cooperates with the second square long groove and moves vertically along the second square long groove. A second receiving cavity is provided on the base (200). The bottom plate of the second top block (801) extends into the second receiving cavity and is threadedly connected to a second adjusting nut, which contacts the bottom of the second receiving cavity. The first adjusting nut (707) controls the movement distance of the second top block (801) along the vertical square so that the second support pin (802) presses against the bottom of the upper edge plate on the back of the second blade (104).

9. The welding and clamping method for gas turbine guide vanes according to claim 8, characterized in that, The first push block (700) has a first inclined surface (705), and the first top block (701) has a second inclined surface (706) that cooperates with the first inclined surface (705); the second push block (800) has a third inclined surface, and the second top block (801) has a fourth inclined surface that cooperates with the third inclined surface.

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