Manufacturing method of transition section structure of heavy duty gas turbine

Abstract

The invention relates to a manufacturing method of a transition section structure, in particular to a manufacturing method of a heavy duty gas turbine transition section structure. The problems that an existing transition section structure is affected by the welding temperature in the welding process to deform, and the product size and follow-up assembly are affected are solved. The tool comprises a transition section assembly body, a first tool, a second tool and a third tool. The transition section assembly comprises a transition section assembly and a transition section outer lining, and the transition section assembly is coaxially sleeved with the transition section outer lining. According to the manufacturing method, a more reasonable tool and a more reasonable assembling and welding sequence are designed according to the characteristics of the transition section structure, the problem of welding deformation is solved, convenience is provided for assembling and welding of the transition section assembly and the transition section outer lining, the overall manufacturing precision of the transition section structure is further guaranteed, and the use performance of the transition section structure is guaranteed. The invention belongs to the technical field of transition section structure manufacturing.

Description

Technical Field

[0001] The invention relates to a method for manufacturing a transition section structure, in particular to a method for manufacturing a transition section structure of a heavy-duty gas turbine, and belongs to the technical field of transition section structure manufacturing. Background Art

[0002] The transition section structure is a very important component in the gas turbine. Its main function is to guide the high-temperature combustion gas generated in the combustion chamber to the guide blades of the turbine, ensuring that the combustion gas can flow smoothly from the combustion chamber to the turbine part.

[0003] The patent with publication number CN117532190A discloses an integral welding tool and welding method for a 400MW heavy-duty gas turbine transition section assembly. In the technical solution of the patent, the welding of the transition section assembly is completed by various tooling. However, as the performance of the unit continues to improve, it is necessary to add a bushing to the original transition section assembly to form an inner and outer double-layer transition section structure to improve the cooling effect of the transition section assembly.

[0004] At present, this type of transition section structure is a thin-walled welded structure, and because of its complex surface, if it is directly welded, the final size will be difficult to guarantee due to welding deformation, which will seriously affect the subsequent assembly of the inner and outer layers. Therefore, there is currently no mature manufacturing technology solution for this type of transition section structure.

[0005] In summary, how to propose a new manufacturing method of the transition section structure in response to the above technical problems has become an urgent problem to be solved by technicians in this field. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, the present invention further provides a method for manufacturing a transition section structure of a heavy-duty gas turbine.

[0007] The technical solution of the present invention is: a method for manufacturing a transition section structure of a heavy-duty gas turbine, comprising a transition section assembly and a first tooling, a second tooling and a third tooling.

[0008] The transition section assembly comprises a transition section component and a transition section outer bushing, and the transition section outer bushing is coaxially sleeved on the transition section component.

[0009] The transition section assembly comprises a mounting edge, a connecting section, a spoiler section, a supporting ring and a front ring which are welded in sequence from top to bottom, and a plurality of floating rings are installed on the connecting section and the spoiler section.

[0010] The outer bushing of the transition section comprises a mounting flange, a curved surface connecting cylinder, a spoiler cone cylinder and an adapter ring which are welded in sequence from top to bottom.

[0011] A number of cooling holes and a number of floating ring connecting holes are processed on the surfaces of the curved connecting tube and the spoiler cone tube. The spoiler cone tube has the same surface as the spoiler section, and the curved connecting tube has the same surface as the connecting section. The curved connecting tube includes an inner arc side docking flap and an outer arc side docking flap, the inner arc side docking flap and the outer arc side docking flap are connected by welding, the inner diameter of the adapter ring is the same as the outer diameter of the support ring, and the adapter ring is mounted on the support ring.

[0012] The first tooling includes a first bottom plate, a first central support column, a wedge block and a square-mouth positioning plate.

[0013] A first positioning boss is integrally arranged on the first bottom plate, and the outer diameter of the first positioning boss is the same as the inner diameter of the outlet end of the curved surface connecting tube.

[0014] One end of the first central support column is coaxially inserted into the first bottom plate, and the other end of the first central support column is provided with a wedge hole.

[0015] The wedge block is inserted into the wedge hole, the square-mouth positioning plate is coaxially mounted on the first central support column, and the square-mouth positioning plate is arranged between the first base plate and the wedge block. A second positioning boss is integrally provided on the square-mouth positioning plate, and the outer diameter of the second positioning boss is the same as the inner diameter of the inlet end of the curved connecting tube.

[0016] The second tooling includes a second bottom plate, a second central support column, a wedge block and a clamping top plate, a first positioning ring, a second positioning ring, two first step rods and two second step rods.

[0017] A third positioning boss is integrally arranged on the second bottom plate, and the outer diameter of the third positioning boss is the same as the inner diameter of the outlet end of the adapter ring; one end of the second center support column is coaxially inserted into the second bottom plate, and the other end of the second center support column is provided with a wedge hole.

[0018] The wedge block is inserted into the wedge hole, and the clamping top plate, the first positioning ring and the second positioning ring are coaxially mounted on the second center support column in sequence. The clamping top plate is arranged between the wedge block and the first positioning ring, and a fourth positioning boss is integrally provided on the clamping top plate. The outer diameter of the fourth positioning boss is the same as the inner diameter of the inlet end of the curved connecting tube.

[0019] The inner diameter of the outlet end of the curved connection cylinder and the inner diameter of the inlet end of the spoiler cone cylinder are both the same as the outer diameter of the first positioning ring, and the inner diameter of the outlet end of the spoiler cone cylinder and the inner diameter of the inlet end of the adapter ring are both the same as the outer diameter of the second positioning ring.

[0020] The second positioning ring is fixedly connected to the second bottom plate, one end of the first step rod and the second step rod are both inserted into the second bottom plate; the other ends of the first step rod and the second step rod are both against the first positioning ring.

[0021] The third tooling includes a third bottom plate, a first mold line template, a wedge-shaped positioning base, a second mold line template, a positioning vertical plate, a third step rod, a third positioning ring, a fourth step rod and a fourth positioning ring.

[0022] The first profile template, the wedge-shaped positioning base, the second profile template and the positioning vertical plate are all vertically mounted on the third bottom plate.

[0023] The positioning vertical plate is arranged at 90 degrees with the first profile template, the first profile template abuts against the profile of the outer arc side docking flap, and the docking surface of the first profile template and the curved connecting tube is arranged at 90 degrees.

[0024] The second profile template is against the profile of the inner arc side docking flap, and the second profile template is arranged at 180 degrees with the first profile template.

[0025] The third step rod is arranged vertically with the third bottom plate, and the third step rod is installed on a wedge-shaped positioning base, a positioning bottom plate is installed on the wedge-shaped positioning base, and the outer diameter of the positioning bottom plate is the same as the inner diameter of the inlet end of the curved connecting cylinder.

[0026] The third positioning ring is sleeved on the third step rod, and the third positioning ring is axially fixed on the third step rod through a nut.

[0027] The fourth step rod is threadedly connected to the third step rod, the fourth positioning ring is sleeved on the fourth step rod, and the fourth positioning ring is axially fixed on the fourth step rod through a nut.

[0028] The manufacturing method is specifically carried out according to the following steps:

[0029] Step 1: Make the curved connecting tube

[0030] Step 11: Place the sheet material between the male die and the female die, and press out the inner arc side butt joint flap and the outer arc side butt joint flap respectively;

[0031] Step 1 and 2, first insert the first central support column on the first bottom plate, then install the inner arc side docking flap and the outer arc side docking flap on the first bottom plate, then put the square mouth positioning plate on the first central support column, and ensure that the two ends of the inner arc side docking flap and the outer arc side docking flap are matched with the first positioning boss and the second positioning boss respectively, and finally insert the wedge block into the wedge hole of the first central support column, and ensure that the wedge block is against the square mouth positioning plate;

[0032] Step 13: Weld the butt joints of the inner arc side butt joint flap and the outer arc side butt joint flap to form a curved surface connection tube;

[0033] Step 2: Make the spoiler cone

[0034] The sheet is put into a cone rolling machine to roll the spoiler cone. Both ends of the spoiler cone are left with processing allowances. The butt joints of the spoiler cone are welded by argon arc welding. After welding, the allowances are removed by laser cutting.

[0035] Step 3: Make the adapter ring

[0036] The sheet material is placed between the male die and the female die to form an adapter ring. A processing allowance is left at both ends of the adapter ring. The allowance at the inlet end of the adapter ring is removed by laser cutting.

[0037] Step 4: Assemble and weld the curved connecting tube, spoiler cone and adapter ring on the second tooling

[0038] Step 41: Install the adapter ring onto the third positioning boss of the second base plate;

[0039] Step 42: First, install the second positioning ring and the second center support column on the second base plate, then sleeve the first positioning ring on the second center support column, and position the first positioning ring through the first step rod and the second step rod;

[0040] Step 43: Mount the spoiler cone on the second central support column, and ensure that the outlet end and the inlet end of the spoiler cone are matched with the second positioning ring and the first positioning ring respectively;

[0041] Step 44: sequentially mount the curved surface connection tube and the pressing top plate on the second central support column, and ensure that the outlet end and the inlet end of the curved surface connection tube are matched with the first positioning ring and the fourth positioning boss on the pressing top plate respectively;

[0042] Step 45: Insert the wedge block into the wedge hole of the second central support column, and ensure that the wedge block abuts against the pressing top plate;

[0043] Step 46: Weld the butt joint between the inlet end of the adapter ring and the outlet end of the spoiler cone, and the butt joint between the outlet end of the curved connecting tube and the inlet end of the spoiler cone respectively;

[0044] Step 47: After welding is completed, the curved connecting tube, the spoiler cone tube and the adapter ring form a welded body, and the welded body and the second tooling are heat treated together to eliminate welding stress;

[0045] Step 5: Mark and split the welded body on the third tooling

[0046] Step 51: Remove the welded body from the second tooling;

[0047] Step 52: First, install the wedge-shaped positioning base on the third bottom plate, and then install the third step rod on the wedge-shaped positioning base;

[0048] Step 53: Sleeve the welded body onto the third step rod, and ensure that the inlet end of the curved connecting tube matches the positioning base plate;

[0049] Step 54: Install the first mold line template, the second mold line template and the positioning vertical plate on the third bottom plate, and ensure that the first mold line template, the second mold line template and the positioning vertical plate are all against the mold surface of the welded body;

[0050] Step 55: Sleeve the third positioning ring onto the third step rod, and ensure that the outer circumference of the third positioning ring abuts against the inner circumference of the welded body;

[0051] Step 56: First, screw the fourth step rod onto the third step rod, and then put the fourth positioning ring onto the fourth step rod, ensuring that the fourth positioning ring abuts against the outlet end of the adapter ring;

[0052] Step 57: Draw an axisymmetric dividing line on the welded body by using the first profile template and the second profile template, and draw contour lines of two cooling holes on the profile surface of the welded body;

[0053] Step 58: First, remove the welded body from the third tooling;

[0054] Then, the welded body is modeled in 3D solid form and the 3D solid model is programmed; the programmed program is input to the five-axis laser cutting machine;

[0055] Then, a five-axis laser cutting machine is used to cut cooling holes in the welded body. When cutting, the contour line drawn in step five or seven is first cut to observe whether the cut cooling hole coincides with the contour line. If not, the position of the welded body on the five-axis laser cutting machine is adjusted until the cooling hole coincides with the contour line.

[0056] Finally, cut cooling holes at other locations on the welded body surface;

[0057] Step 59: Use a five-axis laser cutting machine to cut the welded body into two welded body butt joint flaps along the axisymmetric dividing line;

[0058] Step 6: Assemble the transition section assembly and the transition section outer bushing

[0059] Step 6: Install the mounting flange of the transition section outer bushing on the mounting edge of the transition section assembly by screws;

[0060] Step 62: Put the two welded joint flaps onto the transition section assembly, and ensure that the inlet end of the curved connection tube abuts against the mounting flange;

[0061] Step 6.3. Adjust the positions of the two welded body butt joint flaps to ensure that the inner surface of the welded body butt joint flap is at the same distance as the outer surface of the transition section assembly;

[0062] Step 64: First, use the front ring outlet end face of the transition section assembly as a reference to draw the margin line at the outlet end of the adapter ring;

[0063] Then the mounting flange is spot welded to the inlet end of the curved connection cylinder by argon arc welding;

[0064] Then, remove the screws between the mounting flange and the mounting edge to separate the transition section outer bushing from the transition section assembly;

[0065] Finally, laser cutting is used to remove the excess at the outlet end of the adapter ring;

[0066] Step 65: First, weld the connection between the mounting flange and the curved connecting tube;

[0067] Then the butt joint of the butt flap of the welded body is welded;

[0068] Then, the transition section outer bushing is mounted on the transition section assembly;

[0069] Finally, connect the mounting flange to the mounting edge of the transition section assembly by screws;

[0070] Step 66: Observe the position of the floating ring through the cooling hole, draw the contour line of the floating ring position on the surface of the outer bushing of the transition section, and process the floating ring connecting hole according to the contour line. At this point, the manufacturing of the transition section structure is completed.

[0071] Compared with the prior art, the present invention has the following effects:

[0072] The manufacturing method of the present invention designs more reasonable tooling and welding sequence according to the characteristics of the transition section structure, solves the problem of welding deformation, facilitates the assembly and welding of the transition section assembly 110 and the transition section outer sleeve 120, further ensures the overall manufacturing accuracy of the transition section structure, and ensures the performance of the transition section structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] Figure 1 1 is a schematic structural diagram of a stage assembly 100 of the present invention;

[0074] Figure 2 It is a schematic structural diagram of the transition section outer bushing 120 of the present invention;

[0075] Figure 3 It is a structural schematic diagram of the first tooling 200 of the present invention;

[0076] Figure 4 is a schematic structural diagram of the second tooling 300 of the present invention;

[0077] Figure 5 It is a front view of the third tool 400 of the present invention;

[0078] Figure 6 It is a side view of the third tool 400 of the present invention.

[0079] In the figure:

[0080] 100, transition section assembly; 110, transition section assembly; 120, transition section outer bushing; 121, mounting flange; 122, curved surface connecting cylinder; 123, spoiler cone cylinder; 124, adapter ring;

[0081] 200, first tooling; 11, first bottom plate; 12, first support seat; 15, positioning pin; 16, first central support column; 17, wedge block; 18, square-mouth positioning plate;

[0082] 300, second tooling; 31, second bottom plate; 32, second support seat; 36, second central support column; 38, pressing top plate; 310, first positioning ring; 320, second positioning ring; 330, first step rod; 340, second step rod;

[0083] 400, third tooling; 410, third base plate; 420, first mold line template; 430, wedge-shaped positioning base; 431, positioning base plate; 470, second mold line template; 480, positioning vertical plate; 490, third step rod; 491, third positioning ring; 492, fourth step rod; 493, fourth positioning ring. DETAILED DESCRIPTION

[0084] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0085] Specific implementation method 1: Combination Figures 1 to 6 The present embodiment is described. A method for manufacturing a transition section structure of a heavy-duty gas turbine according to the present embodiment includes a transition section assembly 100 and a first tool 200 , a second tool 300 and a third tool 400 .

[0086] The transition section assembly 100 includes a transition section component 110 and a transition section outer bushing 120 . The transition section outer bushing 120 is coaxially sleeved on the transition section component 110 .

[0087] The transition section assembly 110 includes a mounting edge, a connecting section, a spoiler section, a support ring and a front ring which are welded in sequence from top to bottom, and a plurality of floating rings are installed on the connecting section and the spoiler section.

[0088] The transition section outer bushing 120 includes a mounting flange 121 , a curved connection tube 122 , a spoiler cone 123 and an adapter ring 124 which are welded in sequence from top to bottom.

[0089] A number of cooling holes and a number of floating ring connecting holes are processed on the surfaces of the curved connecting cylinder 122 and the spoiler cone cylinder 123. The spoiler cone cylinder 123 has the same profile as the spoiler section, and the curved connecting cylinder 122 has the same profile as the connecting section. The curved connecting cylinder 122 includes an inner arc side docking flap and an outer arc side docking flap, and the inner arc side docking flap and the outer arc side docking flap are connected by welding. The inner diameter of the adapter ring 124 is the same as the outer diameter of the support ring, and the adapter ring 124 is mounted on the support ring.

[0090] The first tooling 200 includes a first bottom plate 11 , a first central support column 16 , a wedge block 17 and a square-mouth positioning plate 18 .

[0091] A first positioning boss is integrally provided on the first bottom plate 11 , and the outer diameter of the first positioning boss is the same as the inner diameter of the outlet end of the curved surface connecting tube 122 .

[0092] One end of the first central support column 16 is coaxially inserted on the first bottom plate 11 , and the other end of the first central support column 16 is provided with a wedge hole.

[0093] The wedge block 17 is inserted into the wedge hole, and the square-mouth positioning plate 18 is coaxially mounted on the first central support column 16, and the square-mouth positioning plate 18 is arranged between the first bottom plate 11 and the wedge block 17. A second positioning boss is integrally provided on the square-mouth positioning plate 18, and the outer diameter of the second positioning boss is the same as the inner diameter of the inlet end of the curved connecting tube 122.

[0094] The second tooling 300 includes a second bottom plate 31 , a second central support column 36 , a wedge block 17 and a pressing top plate 38 , a first positioning ring 310 , a second positioning ring 320 , two first step rods 330 and two second step rods 340 .

[0095] A third positioning boss is integrally provided on the second bottom plate 31 , and the outer diameter of the third positioning boss is the same as the inner diameter of the outlet end of the adapter ring 124 ; one end of the second center support column 36 is coaxially inserted on the second bottom plate 31 , and the other end of the second center support column 36 is provided with a wedge hole.

[0096] The wedge block 17 is inserted into the wedge hole, and the clamping top plate 38, the first positioning ring 310 and the second positioning ring 320 are coaxially mounted on the second center support column 36 in sequence. The clamping top plate 38 is arranged between the wedge block 17 and the first positioning ring 310, and a fourth positioning boss is integrally provided on the clamping top plate 38. The outer diameter of the fourth positioning boss is the same as the inner diameter of the inlet end of the curved connecting cylinder 122.

[0097] The inner diameter of the outlet end of the curved connecting cylinder 122 and the inner diameter of the inlet end of the spoiler cone cylinder 123 are both the same as the outer diameter of the first positioning ring 310 , and the inner diameter of the outlet end of the spoiler cone cylinder 123 and the inner diameter of the inlet end of the adapter ring 124 are both the same as the outer diameter of the second positioning ring 320 .

[0098] The second positioning ring 320 is fixedly connected to the second bottom plate 31 , one end of the first step rod 330 and the second step rod 340 are both inserted into the second bottom plate 31 ; the other ends of the first step rod 330 and the second step rod 340 are both against the first positioning ring 310 .

[0099] Furthermore, the two first step rods 330 are arranged at 180° in the circumferential direction of the second base plate 31, and the first step rods 330 support the surface of the first positioning ring 310 facing the second base plate 31; the two second step rods 340 are arranged at 180° in the circumferential direction of the second base plate 31, and the second step rods 340 pass through the first positioning ring 310 and are connected to the second base plate 31. This arrangement enables the second step rods 340 to press the surface of the first positioning ring 310 facing the clamping top plate 38.

[0100] The third tooling 400 includes a third bottom plate 410 , a first mold line template 420 , a wedge-shaped positioning base 430 , a second mold line template 470 , a positioning vertical plate 480 , a third step rod 490 , a third positioning ring 491 , a fourth step rod 492 and a fourth positioning ring 493 .

[0101] The first profile template 420 , the wedge-shaped positioning base 430 , the second profile template 470 and the positioning vertical plate 480 are all vertically mounted on the third base plate 410 .

[0102] The positioning vertical plate 480 is arranged at 90° with the first profile template 420, the first profile template 420 is abutted against the profile of the outer arc side docking flap, and the docking surface of the first profile template 420 and the curved connecting tube 122 is arranged at 90°.

[0103] The second profile template 470 abuts against the profile of the inner arc side docking flap, and the second profile template 470 is arranged at 180 degrees with the first profile template 420.

[0104] The third step rod 490 is arranged vertically to the third bottom plate 410 , and the third step rod 490 is installed on the wedge-shaped positioning base 430 , on which a positioning bottom plate 431 is installed, and the outer diameter of the positioning bottom plate 431 is the same as the inner diameter of the inlet end of the curved connecting cylinder 122 .

[0105] The third positioning ring 491 is sleeved on the third step rod 490 , and the third positioning ring 491 is axially fixed on the third step rod 490 by a nut.

[0106] The fourth step rod 492 is threadedly connected to the third step rod 490 , the fourth positioning ring 493 is sleeved on the fourth step rod 492 , and the fourth positioning ring 493 is axially fixed on the fourth step rod 492 by a nut.

[0107] The manufacturing method is specifically carried out according to the following steps:

[0108] Step 1: Manufacturing the curved connecting tube 122

[0109] Step 11: Place the sheet material between the male die and the female die, and press out the inner arc side butt joint flap and the outer arc side butt joint flap respectively;

[0110] Step 1 and 2, first insert the first central support column 16 on the first bottom plate 11, then install the inner arc side docking flap and the outer arc side docking flap on the first bottom plate 11, then put the square mouth positioning plate 18 on the first central support column 16, and ensure that the two ends of the inner arc side docking flap and the outer arc side docking flap are matched with the first positioning boss and the second positioning boss respectively, and finally insert the wedge block 17 into the wedge hole of the first central support column 16, and ensure that the wedge block 17 is against the square mouth positioning plate 18;

[0111] Step 13: welding the butt joints of the inner arc side butt joint flap and the outer arc side butt joint flap to weld the inner arc side butt joint flap and the outer arc side butt joint flap into a curved surface connection tube 122;

[0112] Step 2: Manufacturing spoiler cone 123

[0113] The sheet material is put into a cone rolling machine to roll and form a spoiler cone 123. Both ends of the spoiler cone 123 are left with processing allowances. The butt joints of the spoiler cone 123 are welded by argon arc welding. After welding, the allowances are removed by laser cutting.

[0114] Step 3: Manufacturing the adapter ring 124

[0115] The sheet material is placed between the male die and the female die to form an adapter ring 124. Both ends of the adapter ring 124 have processing allowances, and the allowance at the inlet end of the adapter ring 124 is removed by laser cutting.

[0116] Step 4: Assemble and weld the curved surface connecting tube 122, the spoiler cone tube 123 and the adapter ring 124 on the second tooling 300

[0117] Step 41: Mount the adapter ring 124 on the third positioning boss of the second bottom plate 31;

[0118] Step 42: First, install the second positioning ring 320 and the second center support column 36 on the second base plate 31, then sleeve the first positioning ring 310 on the second center support column 36, and position the first positioning ring 310 through the first step rod 330 and the second step rod 340;

[0119] Step 43: Mount the spoiler cone 123 on the second central support column 36, and ensure that the outlet end and the inlet end of the spoiler cone 123 are matched with the second positioning ring 320 and the first positioning ring 310 respectively;

[0120] Step 44: Mount the curved surface connection tube 122 and the pressing top plate 38 on the second central support column 36 in sequence, and ensure that the outlet end and the inlet end of the curved surface connection tube 122 are matched with the first positioning ring 310 and the fourth positioning boss on the pressing top plate 38 respectively;

[0121] Step 45: Insert the wedge block 17 into the wedge hole of the second central support column 36, and ensure that the wedge block 17 abuts against the pressing top plate 38;

[0122] Step 46: Weld the joint between the inlet end of the adapter ring 124 and the outlet end of the spoiler cone 123, and the joint between the outlet end of the curved connecting tube 122 and the inlet end of the spoiler cone 123 respectively;

[0123] Step 47: After welding is completed, the curved connecting tube 122, the spoiler cone tube 123 and the adapter ring 124 form a welded body, and the welded body and the second tooling 300 are heat treated together to eliminate welding stress;

[0124] Step 5: Marking and dividing the welded body on the third tooling 400

[0125] Step 51: Remove the welded body from the second tooling 300;

[0126] Step 52: First, install the wedge-shaped positioning base 430 on the third bottom plate 410, and then install the third step rod 490 on the wedge-shaped positioning base 430;

[0127] Step 53: Sleeve the welded body onto the third step rod 490, and ensure that the inlet end of the curved connecting tube 122 matches the positioning base plate 431;

[0128] Step 54: Install the first mold line template 420, the second mold line template 470 and the positioning vertical plate 480 on the third bottom plate 410, and ensure that the first mold line template 420, the second mold line template 470 and the positioning vertical plate 480 are all against the mold surface of the welded body;

[0129] Step 55: Sleeve the third positioning ring 491 onto the third step rod 490, and ensure that the outer circumferential surface of the third positioning ring 491 abuts against the inner circumferential surface of the welded body;

[0130] Step 56: First, screw the fourth step rod 492 onto the third step rod 490, and then put the fourth positioning ring 493 onto the fourth step rod 492, ensuring that the fourth positioning ring 493 abuts against the outlet end of the adapter ring 124;

[0131] Step 57: Draw an axisymmetric dividing line on the welded body by using the first profile template 420 and the second profile template 470, and draw contour lines of two cooling holes on the profile surface of the welded body;

[0132] Step 58: First, remove the welded body from the third tooling 400;

[0133] Then, the welded body is modeled in 3D solid form and the 3D solid model is programmed; the programmed program is input to the five-axis laser cutting machine;

[0134] Then, a five-axis laser cutting machine is used to cut cooling holes in the welded body. When cutting, the contour line drawn in step five or seven is first cut to observe whether the cut cooling hole coincides with the contour line. If not, the position of the welded body on the five-axis laser cutting machine is adjusted until the cooling hole coincides with the contour line.

[0135] Finally, cut cooling holes at other locations on the welded body surface;

[0136] Step 59: Use a five-axis laser cutting machine to cut the welded body into two welded body butt joint flaps along the axisymmetric dividing line;

[0137] Step 6: Assemble the transition section assembly 110 and the transition section outer bushing 120

[0138] Step 61: Install the mounting flange 121 of the transition section outer bushing 120 on the mounting edge of the transition section assembly 110 by screws;

[0139] Step 62: Mount the two welded joint flaps on the transition section assembly 110, and ensure that the inlet end of the curved connection tube 122 abuts against the mounting flange 121;

[0140] Step 63: Adjust the positions of the two welded body butt joint flaps to ensure that the inner surface of the welded body butt joint flap is at the same distance as the outer surface of the transition section assembly 110;

[0141] Step 64: First, use the front ring outlet end face of the transition section assembly 110 as a reference to draw a margin line at the outlet end of the adapter ring 124;

[0142] Then the mounting flange 121 is spot welded to the inlet end of the curved surface connecting tube 122 by argon arc welding;

[0143] Then, the screws between the mounting flange 121 and the mounting edge are removed to separate the transition section outer bushing 120 from the transition section assembly 110;

[0144] Finally, laser cutting is used to remove the excess at the outlet end of the adapter ring 124;

[0145] Step 65: First, weld the connection between the mounting flange 121 and the curved connection tube 122;

[0146] Then the butt joint of the butt flap of the welded body is welded;

[0147] Then, the transition section outer bushing 120 is mounted on the transition section assembly 110;

[0148] Finally, the mounting flange 121 is connected to the mounting edge of the transition section assembly 110 by screws;

[0149] Step 66: Observe the position of the floating ring through the cooling hole, draw the contour line of the floating ring position on the surface of the transition section outer bushing 120, and process the floating ring connecting hole according to the contour line, thereby completing the manufacturing of the transition section structure.

[0150] In this embodiment, the outlet end surface of the curved surface connecting tube 122 is parallel to the horizontal plane, and the included angle between the inlet end surface of the curved surface connecting tube 122 and the horizontal plane is β.

[0151] Furthermore, the first central support column 16 includes a first column body and a second column body, and the first column body and the second column body are integrally arranged. The first column body is inserted into the first support seat 12, a wedge hole is opened on the second column body, a wedge block 17 is inserted into the wedge hole, a square-mouth positioning plate 18 is coaxially sleeved on the second column body, and the angle between the second column body and the first column body is (180°-β).

[0152] Furthermore, the second central support column 36 includes a third column body and a fourth column body, and the third column body and the fourth column body are integrally arranged. The third column body is inserted into the second support seat 32, and a wedge hole is opened on the fourth column body, and the wedge block 17 is inserted into the wedge hole. The pressing top plate 38 is coaxially sleeved on the fourth column body, and the angle between the fourth column body and the third column body is (180°-β).

[0153] Furthermore, the wedge angle of the wedge-shaped positioning base 430 is β, which ensures that when the welded body is installed on the third tooling 400, the welded body is perpendicular to the horizontal plane.

[0154] Specific implementation method 2: Combination Figure 3 To explain this embodiment, the first tooling 200 of this embodiment further includes a first support seat 12 . The first support seat 12 is installed on the first base plate 11 , and the first central support column 16 is inserted into the first support seat 12 .

[0155] Furthermore, the first central support column 16 is axially fixed on the first support seat 12 by the positioning pin 15 .

[0156] Other components and connection methods are the same as those in the first embodiment.

[0157] Specific implementation method three: Combination Figure 4 To explain this embodiment, the second tool 300 of this embodiment further includes a second support base 32 . The second support base 32 is installed on the second base plate 31 , and the second central support column 36 is inserted into the second support base 32 .

[0158] The second central support column 36 is axially fixed on the second support seat 32 by the positioning pin 15 .

[0159] Other components and connection methods are the same as those in the first or second embodiment.

[0160] The present invention has been disclosed as above in the form of a preferred embodiment, but it is not intended to limit the present invention. Any simple modification, equivalent changes and modifications made to the above implementation cases by any professional and technical personnel who do not deviate from the content of the technical solution of the present invention and based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for manufacturing a transition section structure of a heavy-duty gas turbine, comprising a transition section assembly (100) and a first tooling (200), a second tooling (300) and a third tooling (400); The transition section assembly (100) comprises a transition section component (110) and a transition section outer bushing (120), wherein the transition section outer bushing (120) is coaxially sleeved on the transition section component (110); The transition section assembly (110) comprises a mounting edge, a connecting section, a spoiler section, a support ring and a front ring which are welded in sequence from top to bottom, and a plurality of floating rings are installed on the connecting section and the spoiler section; The transition section outer bushing (120) comprises a mounting flange (121), a curved surface connecting cylinder (122), a spoiler cone cylinder (123) and an adapter ring (124) which are welded in sequence from top to bottom; A plurality of cooling holes and a plurality of floating ring connection holes are processed on the profiles of the curved connection tube (122) and the spoiler cone tube (123); the spoiler cone tube (123) has the same profile as the spoiler section, and the curved connection tube (122) has the same profile as the connection section; the curved connection tube (122) comprises an inner arc side docking flap and an outer arc side docking flap, the inner arc side docking flap and the outer arc side docking flap are connected by welding, the inner diameter of the adapter ring (124) is the same as the outer diameter of the support ring, and the adapter ring (124) is sleeved on the support ring; The first tooling (200) comprises a first bottom plate (11), a first central support column (16), a wedge block (17) and a square-mouth positioning plate (18); A first positioning boss is integrally provided on the first bottom plate (11), and the outer diameter of the first positioning boss is the same as the inner diameter of the outlet end of the curved surface connecting tube (122); One end of the first central support column (16) is coaxially inserted on the first bottom plate (11), and the other end of the first central support column (16) is provided with a wedge hole; The wedge block (17) is inserted into the wedge hole, the square-mouth positioning plate (18) is coaxially sleeved on the first central support column (16), and the square-mouth positioning plate (18) is arranged between the first bottom plate (11) and the wedge block (17), and a second positioning boss is integrally provided on the square-mouth positioning plate (18), and the outer diameter of the second positioning boss is the same as the inner diameter of the inlet end of the curved surface connecting tube (122); The second tooling (300) comprises a second bottom plate (31), a second central support column (36), a wedge block (17), a pressing top plate (38), a first positioning ring (310), a second positioning ring (320), two first step rods (330) and two second step rods (340); A third positioning boss is integrally provided on the second bottom plate (31), and the outer diameter of the third positioning boss is the same as the inner diameter of the outlet end of the adapter ring (124); one end of the second central support column (36) is coaxially inserted on the second bottom plate (31), and the other end of the second central support column (36) is provided with a wedge hole; The wedge block (17) is inserted into the wedge hole, the clamping top plate (38), the first positioning ring (310) and the second positioning ring (320) are coaxially mounted on the second central support column (36) in sequence, the clamping top plate (38) is arranged between the wedge block (17) and the first positioning ring (310), and a fourth positioning boss is integrally provided on the clamping top plate (38), and the outer diameter of the fourth positioning boss is the same as the inner diameter of the inlet end of the curved connection tube (122); The inner diameter of the outlet end of the curved connection cylinder (122) and the inner diameter of the inlet end of the spoiler cone cylinder (123) are both the same as the outer diameter of the first positioning ring (310), and the inner diameter of the outlet end of the spoiler cone cylinder (123) and the inner diameter of the inlet end of the adapter ring (124) are both the same as the outer diameter of the second positioning ring (320); The second positioning ring (320) is fixedly connected to the second bottom plate (31); one end of the first step rod (330) and the second step rod (340) are both inserted into the second bottom plate (31); the other ends of the first step rod (330) and the second step rod (340) are both against the first positioning ring (310); The third tooling (400) comprises a third bottom plate (410), a first mold line template (420), a wedge-shaped positioning base (430), a second mold line template (470), a positioning vertical plate (480), a third step rod (490), a third positioning ring (491), a fourth step rod (492) and a fourth positioning ring (493); The first mold line template (420), the wedge-shaped positioning base (430), the second mold line template (470) and the positioning vertical plate (480) are all vertically installed on the third bottom plate (410); The positioning vertical plate (480) and the first mold line template (420) are arranged at 90 degrees, the first mold line template (420) and the mold surface of the outer arc side docking flap are abutted, and the docking surface of the first mold line template (420) and the curved surface connecting tube (122) are arranged at 90 degrees; The second profile template (470) abuts against the profile of the inner arc side butt flap, and the second profile template (470) is arranged at 180 degrees with the first profile template (420); The third step rod (490) is arranged vertically with the third bottom plate (410), and the third step rod (490) is installed on a wedge-shaped positioning base (430), a positioning bottom plate (431) is installed on the wedge-shaped positioning base (430), and the outer diameter of the positioning bottom plate (431) is the same as the inner diameter of the inlet end of the curved surface connecting cylinder (122); The third positioning ring (491) is sleeved on the third step rod (490), and the third positioning ring (491) is axially fixed on the third step rod (490) by a nut; The fourth step rod (492) is threadedly connected to the third step rod (490), the fourth positioning ring (493) is sleeved on the fourth step rod (492), and the fourth positioning ring (493) is axially fixed on the fourth step rod (492) through a nut; It is characterized in that The manufacturing method is specifically carried out according to the following steps: Step 1: Manufacturing the curved connecting tube (122) Step 11: Place the sheet material between the male die and the female die, and press out the inner arc side butt joint flap and the outer arc side butt joint flap respectively; Step 1 and 2, first insert the first central support column (16) on the first base plate (11), then install the inner arc side docking flap and the outer arc side docking flap on the first base plate (11), then put the square mouth positioning plate (18) on the first central support column (16), and ensure that the two ends of the inner arc side docking flap and the outer arc side docking flap are respectively matched with the first positioning boss and the second positioning boss, and finally insert the wedge block (17) into the wedge hole of the first central support column (16), and ensure that the wedge block (17) and the square mouth positioning plate (18) are against each other; Step 13: welding the butt joints of the inner arc side butt joint flap and the outer arc side butt joint flap to weld the inner arc side butt joint flap and the outer arc side butt joint flap into a curved surface connection tube (122); Step 2: Manufacturing spoiler cone (123) The sheet material is placed in a cone rolling machine to roll and form a spoiler cone (123), both ends of the spoiler cone (123) are left with processing allowances, the butt joint of the spoiler cone (123) is welded by argon arc welding, and after the welding is completed, the allowance is removed by laser cutting; Step 3: Make the adapter ring (124) The sheet material is placed between the male die and the female die to form an adapter ring (124), with machining allowances being left at both ends of the adapter ring (124), and the allowance at the inlet end of the adapter ring (124) is removed by laser cutting; Step 4: Assemble and weld the curved surface connecting tube (122), the spoiler cone tube (123) and the adapter ring (124) on the second tooling (300) Step 41: Mount the adapter ring (124) on the third positioning boss of the second bottom plate (31); Step 42: First, install the second positioning ring (320) and the second central support column (36) on the second base plate (31), then sleeve the first positioning ring (310) on the second central support column (36), and position the first positioning ring (310) by means of the first step rod (330) and the second step rod (340); Step 43: Mount the spoiler cone (123) on the second central support column (36), and ensure that the outlet end and the inlet end of the spoiler cone (123) are matched with the second positioning ring (320) and the first positioning ring (310) respectively; Step 44: sequentially mount the curved surface connection tube (122) and the pressing top plate (38) on the second central support column (36), and ensure that the outlet end and the inlet end of the curved surface connection tube (122) are matched with the first positioning ring (310) and the fourth positioning boss on the pressing top plate (38), respectively; Step 45: insert the wedge block (17) into the wedge hole of the second central support column (36), and ensure that the wedge block (17) abuts against the pressing top plate (38); Step 46: Weld the joints between the inlet end of the adapter ring (124) and the outlet end of the spoiler cone (123), and the joints between the outlet end of the curved connecting tube (122) and the inlet end of the spoiler cone (123) respectively; Step 47: After the welding is completed, the curved connecting tube (122), the spoiler cone tube (123) and the adapter ring (124) form a welded body, and the welded body and the second tooling (300) are heat treated together to eliminate welding stress; Step 5: Marking and dividing the welded body on the third tooling (400) Step 51: Remove the welded body from the second tooling (300); Step 52: First, install the wedge-shaped positioning base (430) on the third bottom plate (410), and then install the third step rod (490) on the wedge-shaped positioning base (430); Step 53: Sleeve the welded body onto the third step rod (490), and ensure that the inlet end of the curved surface connecting tube (122) matches the positioning base plate (431); Step 54: Install the first mold line template (420), the second mold line template (470) and the positioning vertical plate (480) on the third bottom plate (410), and ensure that the first mold line template (420), the second mold line template (470) and the positioning vertical plate (480) are all against the mold surface of the welded body; Step 55: Sleeve the third positioning ring (491) onto the third step rod (490), and ensure that the outer circumferential surface of the third positioning ring (491) abuts against the inner circumferential surface of the welded body; Step 56: First, screw the fourth step rod (492) onto the third step rod (490), and then put the fourth positioning ring (493) onto the fourth step rod (492), ensuring that the fourth positioning ring (493) abuts against the outlet end of the adapter ring (124); Step 57: Draw an axisymmetric dividing line on the welded body by using the first mold line template (420) and the second mold line template (470), and draw contour lines of two cooling holes on the mold surface of the welded body; Step 58: First, remove the welded body from the third tooling (400); Then, the welded body is modeled in 3D solid form and the 3D solid model is programmed; the programmed program is input to the five-axis laser cutting machine; Then, a five-axis laser cutting machine is used to cut cooling holes in the welded body. When cutting, the contour line drawn in step five or seven is first cut to observe whether the cut cooling hole coincides with the contour line. If not, the position of the welded body on the five-axis laser cutting machine is adjusted until the cooling hole coincides with the contour line. Finally, cut cooling holes at other locations on the welded body surface; Step 59: Use a five-axis laser cutting machine to cut the welded body into two welded body butt joint flaps along the axisymmetric dividing line; Step 6: Assemble the transition section assembly (110) and the transition section outer bushing (120) Step 61: Install the mounting flange (121) of the transition section outer bushing (120) on the mounting edge of the transition section assembly (110) by screws; Step 62: Mount the two welded joint flaps on the transition section assembly (110), and ensure that the inlet end of the curved connection tube (122) abuts against the mounting flange (121); Step 63: Adjust the positions of the two welded body butt joint flaps to ensure that the inner surface of the welded body butt joint flaps is consistent with the outer surface of the transition section assembly (110); Step 64: First, using the front ring outlet end face of the transition section assembly (110) as a reference, draw a margin line at the outlet end of the adapter ring (124); Then the mounting flange (121) is spot welded to the inlet end of the curved surface connecting tube (122) by argon arc welding; Then, the screws between the mounting flange (121) and the mounting edge are removed to separate the transition section outer bushing (120) from the transition section assembly (110); Finally, laser cutting is used to remove the excess at the outlet end of the adapter ring (124); Step 65: First, weld the connection between the mounting flange (121) and the curved connection tube (122); Then the butt joint of the butt flap of the welded body is welded; Then, the transition section outer bushing (120) is mounted on the transition section assembly (110); Finally, the mounting flange (121) is connected to the mounting edge of the transition section assembly (110) by screws; Step 66: Observe the position of the floating ring through the cooling hole, draw the contour line of the floating ring position on the surface of the transition section outer bushing (120), and process the floating ring connecting hole according to the contour line, thus completing the manufacturing of the transition section structure.

2. The method for manufacturing a transition section structure of a heavy-duty gas turbine according to claim 1, characterized in that: The first tooling (200) further comprises a first support seat (12), the first support seat (12) being mounted on the first base plate (11), and the first central support column (16) being inserted into the first support seat (12).

3. The method for manufacturing a transition section structure of a heavy-duty gas turbine according to claim 2, characterized in that: The first central support column (16) is axially fixed on the first support seat (12) via a positioning pin (15).

4. The method for manufacturing a transition section structure of a heavy-duty gas turbine according to claim 3, characterized in that: The second tooling (300) further comprises a second support base (32), the second support base (32) being mounted on the second base plate (31), and the second central support column (36) being inserted into the second support base (32).

5. The method for manufacturing a transition section structure of a heavy-duty gas turbine according to claim 4, characterized in that: The second central support column (36) is axially fixed on the second support seat (32) via a positioning pin (15).

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