Machining method of ultra-large mixed-flow water turbine blade physical model

Abstract

The invention belongs to the technical field of machining of casting wood patterns, and particularly relates to a machining method of an ultra-large mixed-flow water turbine blade physical model. Placing the three-dimensional digital model according to orthographic projection of a front view, making a stepped decomposition line L2 passing through a point B along the z-axis direction, and dividing the stepped decomposition line L2 into two sections which are staggered along the x-axis direction; performing simulation cutting on the three-dimensional digital model along a stepped decomposition line L2 to form a simulated gentle sheet and a simulated warped sheet; the point C is raised by rotating the simulated gentle sheet, so that the intersection point C is as high as the highest position of the upper surface of the simulated gentle sheet; the point E is raised by rotating the simulated warping sheet twice, and finally, the point D is lower than the point E; when the simulated gentle sheet and the simulated warping sheet are both within the machining range of the numerical control milling machine, the three-dimensional digital model is cut according to the stepped decomposition line L2, and after the gentle sheet and the warping sheet are formed, the gentle sheet and the warping sheet are machined through the numerical control milling machine. And a physical model of the ultra-large mixed-flow water turbine blade can be conveniently machined through a numerical control milling machine.

Description

Technical Field

[0001] The invention belongs to the technical field of processing casting wooden molds, and in particular relates to a processing method for a super-large Francis turbine blade physical model. Background Art

[0002] A water turbine is a power machine that converts the energy of water flow into rotational mechanical energy. Most of them are installed in hydropower stations to drive generators to generate electricity. The larger the capacity of the turbine, the larger the blade size. Generally speaking, a turbine unit with a runner diameter of ≥8 meters is considered an ultra-large turbine unit. Large hydropower station units such as the Three Gorges, Baihetan, Xiangjiaba, and Wuqiangxi, which are million-kilowatt-level units, are ultra-large mixed-flow turbine units, and their turbine blades are ultra-large mixed-flow turbine blades. The length of an ultra-large mixed-flow turbine blade is greater than or equal to 5 meters, the width is greater than or equal to 4 meters, and the height is greater than or equal to 2 meters.

[0003] The blades of super-large Francis turbines are generally cast from stainless steel, and the most critical link in casting super-large Francis blades is the production and manufacturing of physical models. The physical models of super-large Francis blades are usually wooden products, and the processing method is mainly CNC processing. Due to the limited processing stroke of woodworking CNC milling machines, namely three-axis CNC milling machines, it is difficult to process the physical models of super-large Francis blades using CNC milling machines, so manual processing is often used, but it has the disadvantages of low efficiency, poor precision, and poor consistency. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for processing a physical model of a super-large Francis turbine blade, which is convenient for processing the physical model of the super-large Francis turbine blade by a CNC milling machine.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a method for processing a physical model of a super-large Francis turbine blade, comprising the steps of:

[0006] S1, the three-dimensional digital model of the physical model of the super-large Francis turbine blade is placed according to the orthographic projection of the main view, and a horizontal reference line L1 is made from the lowest intersection point A of the upper crown edge and the water outlet edge, and the horizontal reference line L1 and the three-dimensional digital model have an intersection point B; based on the original coordinates of the three-dimensional digital model, a step-type decomposition line L2 passing through point B is made along the z-axis direction, and the step-type decomposition line L2 is divided into two sections and is offset along the x-axis direction; the three-dimensional digital model is simulated and cut along the step-type decomposition line L2 to form a simulated flat piece and a simulated warped piece;

[0007] Place the simulated flat sheet according to the orthographic projection of the main view, make a tangent line L3 on the upper surface of the simulated flat sheet through the highest intersection point C of the step-type decomposition line L2 and the water outlet, measure the angle α between the tangent line L3 and the z-axis, rotate the simulated flat sheet counterclockwise by an angle α with the x-axis as the rotation center, so that the intersection point C and the highest point on the upper surface of the simulated flat sheet are at the same height; reduce the overall drop value of the simulated flat sheet in the processing state, and judge whether the simulated flat sheet is within the processing range of the CNC milling machine;

[0008] Place the simulated warping piece according to the orthographic projection of the main view, point D is the highest intersection point of the lower ring edge and the water outlet edge, point E is the highest intersection point of the step decomposition line L2 and the water inlet edge, point D is higher than point E, draw a line L4 connecting point D and point E, and measure the angle β between the line L4 and the z-axis, β>α; rotate the simulated warping piece counterclockwise by an angle γ with the x-axis as the rotation center, γ=α, to reduce the height difference between point D and point E; draw a line L5 connecting point D and the original coordinate origin O of the three-dimensional digital model, measure the angle δ between the line L5 and the x-axis, rotate the simulated warping piece counterclockwise by an angle δ with the z-axis as the rotation center, so that point D is lower than point E; reduce the overall drop value of the simulated warping piece in the processing state, and judge whether the simulated warping piece is within the processing range of the CNC milling machine;

[0009] When both the simulated flat sheet and the simulated warping sheet are within the processing range of the CNC milling machine, the three-dimensional digital model is cut according to the step decomposition line L2 to form the flat sheet and the warping sheet; when the simulated flat sheet and / or the simulated warping sheet are not within the processing range of the CNC milling machine, the position of the step decomposition line L2 is adjusted along the x-axis until both the simulated flat sheet and the simulated warping sheet are within the processing range of the CNC milling machine, and then the three-dimensional digital model is cut according to the adjusted step decomposition line L2 to form the flat sheet and the warping sheet;

[0010] S2, rotating the flat sheet based on the original coordinates of the three-dimensional digital model so that the flat sheet is processed within the processing range of the CNC milling machine; rotating the warping sheet based on the original coordinates of the three-dimensional digital model so that the warping sheet is processed within the processing range of the CNC milling machine;

[0011] S3, erect the fetal membrane so that the upper surface of the fetal membrane is consistent with the inner side of the final formed blade, place the processed flat sheet and the processed warped sheet on the fetal membrane according to their respective positions, dock them through the step-type decomposition line L2, and assemble the fixed structure to connect the processed flat sheet and the processed warped sheet into a physical model.

[0012] Furthermore, the fetal membrane in step S3 includes a bottom plate and a supporting plate vertically arranged on the bottom plate; the length direction of the supporting plate is parallel to the direction from the lower ring edge to the upper crown edge; a plurality of supporting plates are provided, and the plurality of supporting plates are arranged in pairs along the direction from the water inlet edge to the water outlet edge; the upper surface of the supporting plate serves as the upper surface of the fetal membrane;

[0013] The fixed structure in step S3 includes an upper connecting rib, a lower connecting rib and a bolt; the upper connecting rib, the physical model and the lower connecting rib are connected by bolts; the upper connecting rib is arranged on the outer side of the physical model, one end of the upper connecting rib is located on the processed flat sheet, and the other end is located on the processed warping sheet; the lower connecting rib is arranged on the inner side of the physical model and is located between two adjacent supporting plates; one end of the lower connecting rib is located on the processed flat sheet, and the other end is located on the processed warping sheet; a plurality of groups of fixed structures are arranged, and the plurality of groups of fixed structures are arranged in pairs along the direction from the water inlet to the water outlet.

[0014] Furthermore, in step S3, the support plate and the processed flat sheet are positioned by a first groove and protrusion structure, and the support plate and the processed warped sheet are positioned by a second groove and protrusion structure.

[0015] Furthermore, it also includes a vertically arranged connecting plate, through which two adjacent supporting plates are connected; the top of the connecting plate is lower than the top of the supporting plate; there are multiple connecting plates, and the multiple connecting plates are arranged in pairs along the length direction of the supporting plate; the lower connecting ribs are placed on at least two connecting plates.

[0016] Furthermore, a positioning line corresponding to the stepped decomposition line L2 is provided on the upper surface of each supporting plate.

[0017] Furthermore, in the step S1, when adjusting the position of the step decomposition line L2 along the x-axis, the adjustment is performed in multiples of 25 mm.

[0018] Furthermore, the fetal membrane in step S3 is a wooden product.

[0019] Compared with the prior art, the invention has the following beneficial effects: the invention provides a processing method for a physical model of a super-large Francis turbine blade, which is convenient for processing super-large turbine blades by a CNC milling machine. The "decomposition-rotation method" solves the problem of limited CNC milling machine processing of a physical model of a super-large Francis turbine blade, and reduces the difficulty of CNC processing. It has the advantages of simple operation, high precision, high efficiency, good consistency, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The lowest intersection point A between the crown edge and the water outlet edge is used as the horizontal reference line L1, and the horizontal reference line L1 and the three-dimensional digital mold have an intersection point B;

[0021] Figure 2 is a schematic diagram of the position of the step-type decomposition line L2;

[0022] Figure 3 It is a schematic diagram of a tangent line L3 of the upper surface of a simulated flat sheet passing through the highest intersection point C of the step-type decomposition line L2 and the water outlet edge;

[0023] Figure 4 It is a schematic diagram of rotating the simulated flat sheet counterclockwise by an angle α with the x-axis as the rotation center so that the intersection point C is at the same height as the highest point on the upper surface of the simulated flat sheet;

[0024] Figure 5 It is a schematic diagram of the line L4 connecting the points D and E of the simulated warped sheet;

[0025] Figure 6 It is a schematic diagram of rotating the simulated warped sheet counterclockwise by an angle γ with the x-axis as the rotation center;

[0026] Figure 7 It is a schematic diagram of the line L5 connecting point D and the original coordinate origin O of the three-dimensional digital model;

[0027] Figure 8 It is a schematic diagram of rotating the simulated warping sheet counterclockwise by an angle δ with the z-axis as the rotation center;

[0028] Fig. 9 It is a schematic diagram of the three-dimensional structure of the fetal membrane;

[0029] Fig.10 It is a three-dimensional schematic diagram of a processed flat sheet and a processed warped sheet placed on a fetal membrane and connected by a fixing structure (the lower connecting rib is not shown);

[0030] Figure markings: 1-upper crown edge; 2-lower ring edge; 3-water inlet edge; 4-water outlet edge; 5-simulated flat plate; 6-simulated warping plate; 7-fetal membrane; 701-bottom plate; 702-supporting plate; 703-connecting plate; 704-reinforcement plate; 8-upper connecting rib; 9-processed flat plate; 10-processed warping plate. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0032] A method for processing a physical model of a super-large Francis turbine blade comprises the following steps:

[0033] S1, such as Figure 1 , 2 As shown, the three-dimensional digital model of the physical model of the super-large mixed flow turbine blade is placed according to the orthographic projection of the main view, and the lowest intersection point A between the upper crown edge 1 and the outlet edge 4 is used as a horizontal reference line L1, and the horizontal reference line L1 and the three-dimensional digital model have an intersection point B; based on the original coordinates of the three-dimensional digital model, a step-type decomposition line L2 passing through point B is made along the z-axis direction, and the step-type decomposition line L2 is divided into two sections and is offset along the x-axis direction; the three-dimensional digital model is simulated and cut along the step-type decomposition line L2 to form a simulated flat piece 5 and a simulated warped piece 6.

[0034] like Figure 3, 4 As shown, the simulated flat sheet 5 is placed according to the orthographic projection of the main view, and the tangent L3 of the upper surface of the simulated flat sheet 5 is made through the highest intersection C of the step-type decomposition line L2 and the water outlet 4. The angle α between the tangent L3 and the z-axis is measured, α=18°, and the simulated flat sheet 5 is rotated counterclockwise by an angle α with the x-axis as the rotation center, so that the intersection C is at the same height as the highest point on the upper surface of the simulated flat sheet 5; the overall drop value of the simulated flat sheet 5 in the processing state is reduced to determine whether the simulated flat sheet 5 is within the processing range of the CNC milling machine. Specifically, the C point is raised by rotating the simulated flat sheet 5, so that the intersection C is at the same height as the highest point on the upper surface of the simulated flat sheet 5. Reducing the overall drop value of the simulated flat sheet 5 in the processing state specifically refers to reducing the distance between the highest point and the lowest point of the simulated flat sheet 5 in the processing state. The simulated flat sheet 5 is adjusted within the processing range of the CNC milling machine to reduce the difficulty of CNC processing.

[0035] like Figure 5 , 6 As shown in , 7 and 8, the simulated warping piece 6 is placed according to the positive projection of the main view, point D is the highest intersection point of the lower ring edge 2 and the water outlet edge 4, point E is the highest intersection point of the step decomposition line L2 and the water inlet edge 3, point D is higher than point E, a line L4 is drawn between point D and point E, and the angle β=21.5° between the line L4 and the z-axis is measured, β>α; the simulated warping piece 6 is rotated counterclockwise by an angle γ with the x-axis as the rotation center, γ=α=18°, so as to reduce the height difference between point D and point E; a line L5 is drawn between point D and the original coordinate origin O of the three-dimensional digital model, and the angle δ between the line L5 and the x-axis is measured, δ=10°, and the simulated warping piece 6 is rotated counterclockwise by an angle δ with the z-axis as the rotation center, so that point D is lower than point E; the overall drop value of the simulated warping piece 6 in the processing state is reduced to determine whether the simulated warping piece 6 is within the processing range of the CNC milling machine. Specifically, the simulated warping sheet 6 is rotated twice to raise point E, and finally point D is lower than point E. Since the simulated warping sheet 6 needs to be rotated twice, the rotation angle each time should not be too large. Reducing the overall drop value of the simulated warping sheet 6 in the processing state specifically refers to reducing the distance between the highest point and the lowest point of the simulated warping sheet 6 in the processing state. Adjust the simulated warping sheet 6 within the processing range of the CNC milling machine to reduce the difficulty of CNC processing.

[0036] When the simulated flat sheet 5 and the simulated warping sheet 6 are both within the processing range of the CNC milling machine, the three-dimensional digital model is cut according to the step decomposition line L2 to form a flat sheet and a warping sheet; when the simulated flat sheet 5 and / or the simulated warping sheet 6 are not within the processing range of the CNC milling machine, that is, when the adjusted drop value is not large enough, the position of the step decomposition line L2 is adjusted along the x-axis direction until the simulated flat sheet 5 and the simulated warping sheet 6 are both within the processing range of the CNC milling machine, and then the three-dimensional digital model is cut according to the adjusted step decomposition line L2 to form a flat sheet and a warping sheet.

[0037] The three-dimensional digital model of the physical model of the super-large Francis turbine blade is placed according to the orthographic projection of the main view, which means that the outer side faces upward and the inner side faces downward.

[0038] S2, rotating the flat sheet based on the original coordinates of the three-dimensional digital model so that the flat sheet can be processed within the processing range of the CNC milling machine; rotating the warping sheet based on the original coordinates of the three-dimensional digital model so that the warping sheet can be processed within the processing range of the CNC milling machine.

[0039] S3, set up the fetal membrane 7, make the upper surface of the fetal membrane 7 consistent with the inner side of the final formed blade, place the processed flat sheet 9 and the processed warping sheet 10 on the fetal membrane 7 according to their respective positions, dock them through the step-type decomposition line L2, assemble the fixed structure to connect the processed flat sheet 9 and the processed warping sheet 10 into a physical model. The purpose of setting up the fetal membrane 7 is to place the processed flat sheet 9 and the processed warping sheet 10 stably, so as to facilitate docking and connection operations, and ensure that the final molding of the physical model meets the requirements.

[0040] The final connected and formed physical model placed on the fetal membrane 7 has its inner side facing downward and its outer side facing upward.

[0041] Specifically, Fig. 9 As shown, the fetal membrane 7 in step S3 includes a bottom plate 701 and a supporting plate 702 vertically arranged on the bottom plate 701; the length direction of the supporting plate 702 is parallel to the direction from the lower ring edge 2 to the upper crown edge 1; a plurality of supporting plates 702 are provided, and the plurality of supporting plates 702 are arranged in pairs along the direction from the water inlet edge 3 to the water outlet edge 4; the upper surface of the supporting plate 702 serves as the upper surface of the fetal membrane 7.

[0042] Specifically, Fig.10 As shown, the fixing structure in step S3 includes an upper connecting rib 8, a lower connecting rib and a bolt; the upper connecting rib 8, the physical model and the lower connecting rib are connected by bolts; the upper connecting rib 8 is arranged on the outer side of the physical model, one end of the upper connecting rib 8 is located on the processed flat sheet 9, and the other end is located on the processed warping sheet 10; the lower connecting rib is arranged on the inner side of the physical model and between two adjacent supporting plates 702; one end of the lower connecting rib is located on the processed flat sheet 9, and the other end is located on the processed warping sheet 10; multiple groups of fixing structures are provided, and the multiple groups of fixing structures are arranged in pairs along the direction from the water inlet edge 3 to the water outlet edge 4. The upper connecting rib 8 is tightly fitted with the outer side of the physical model, and the lower connecting rib is tightly fitted with the inner side of the physical model.

[0043] In step S3, the support plate 702 and the processed flat sheet 9 are positioned by the first groove and protrusion structure, and the support plate 702 and the processed warping sheet 10 are positioned by the second groove and protrusion structure. By setting the first groove and protrusion structure and the second groove and protrusion structure, the processed flat sheet 9 and the processed warping sheet 10 can be quickly placed in place.

[0044] In order to further improve the placement accuracy of the processed flat sheet 9 and the processed warped sheet 10, preferably, the upper surface of each of the supporting plates 702 is provided with a positioning line corresponding to the step decomposition line L2.

[0045] Preferably, it further comprises a vertically arranged connecting plate 703, through which two adjacent supporting plates 702 are connected; the top of the connecting plate 703 is lower than the top of the supporting plate 702; there are multiple connecting plates 703, and the multiple connecting plates 703 are arranged in pairs along the length direction of the supporting plate 702; the lower connecting ribs are placed on at least two connecting plates 703. Specifically, the connecting plate 703 is connected to the supporting plate 702 by wood screws or iron nails. Not only can the structural stability and support strength of the fetal membrane 7 be improved, but also the lower connecting ribs can be stably placed.

[0046] As a further preference, a reinforcing plate 704 is further included, and the plurality of supporting plates 702 are connected via the reinforcing plate 704 , and both ends of the supporting plates 702 in the length direction are connected with the reinforcing plates 704 .

[0047] Preferably, after step S3, step S4 is further included, in which a numerically controlled milling machine is used to detect whether the assembly dimensions of the processed flattening sheet 9 and the processed warping sheet 10 are in place, thereby ensuring that the inner side of the physical model closely coincides with the upper surface of the fetal membrane 7. Detection by a numerically controlled milling machine has the advantages of simple operation and high accuracy.

[0048] Preferably, in step S1, when adjusting the position of the step decomposition line L2 along the x-axis, the adjustment is performed in multiples of 25 mm.

[0049] Preferably, the fetal membrane 7 in step S3 is a wooden product.

[0050] The embodiments of this specific implementation are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for processing a physical model of a super-large Francis turbine blade, characterized in that: Includes steps: S1, the three-dimensional digital model of the physical model of the super-large mixed flow turbine blade is placed according to the orthographic projection of the main view, and the lowest intersection point A of the upper crown edge (1) and the outlet edge (4) is used as a horizontal reference line L1, and the horizontal reference line L1 and the three-dimensional digital model have an intersection point B; based on the original coordinates of the three-dimensional digital model, a step-type decomposition line L2 passing through point B is made along the z-axis direction, and the step-type decomposition line L2 is divided into two sections and is offset along the x-axis direction; the three-dimensional digital model is simulated and cut along the step-type decomposition line L2 to form a simulated flat piece (5) and a simulated warped piece (6); The simulated flat sheet (5) is placed according to the orthographic projection of the main view, and a tangent line L3 is made on the upper surface of the simulated flat sheet (5) through the highest intersection point C of the step-type decomposition line L2 and the water outlet edge (4), and the angle α between the tangent line L3 and the z-axis is measured. The simulated flat sheet (5) is rotated counterclockwise by an angle α with the x-axis as the rotation center, so that the intersection point C and the highest point on the upper surface of the simulated flat sheet (5) are at the same height; the overall drop value of the simulated flat sheet (5) in the processing state is reduced to determine whether the simulated flat sheet (5) is within the processing range of the CNC milling machine; The simulated warping sheet (6) is placed according to the orthographic projection of the main view, point D is the highest intersection point of the lower ring edge (2) and the water outlet edge (4), point E is the highest intersection point of the step-type decomposition line L2 and the water inlet edge (3), point D is higher than point E, a line L4 is drawn between point D and point E, and the angle β between the line L4 and the z-axis is measured, β>α; the simulated warping sheet (6) is rotated counterclockwise by an angle γ with the x-axis as the rotation center, γ=α, so as to reduce the height difference between point D and point E; a line L5 is drawn between point D and the original coordinate origin O of the three-dimensional digital model, and the angle δ between the line L5 and the x-axis is measured, and the simulated warping sheet (6) is rotated counterclockwise by an angle δ with the z-axis as the rotation center, so that point D is lower than point E; the overall drop value of the simulated warping sheet (6) in the processing state is reduced, and it is judged whether the simulated warping sheet (6) is within the processing range of the CNC milling machine; When the simulated flat sheet (5) and the simulated warping sheet (6) are both within the processing range of the CNC milling machine, the three-dimensional digital model is cut according to the step-type decomposition line L2 to form a flat sheet and a warping sheet; when the simulated flat sheet (5) and / or the simulated warping sheet (6) are not within the processing range of the CNC milling machine, the position of the step-type decomposition line L2 is adjusted along the x-axis until the simulated flat sheet (5) and the simulated warping sheet (6) are both within the processing range of the CNC milling machine, and then the three-dimensional digital model is cut according to the adjusted step-type decomposition line L2 to form a flat sheet and a warping sheet; S2, rotating the flat sheet based on the original coordinates of the three-dimensional digital model so that the flat sheet is processed within the processing range of the CNC milling machine; rotating the warping sheet based on the original coordinates of the three-dimensional digital model so that the warping sheet is processed within the processing range of the CNC milling machine; S3, erect the fetal membrane (7) so that the upper surface of the fetal membrane (7) is consistent with the inner side of the final formed blade, place the processed flat sheet (9) and the processed warped sheet (10) on the fetal membrane (7) according to their respective positions, connect them through the step-type decomposition line L2, and assemble the fixed structure to connect the processed flat sheet (9) and the processed warped sheet (10) into a physical model.

2. The method for processing a physical model of a super-large Francis turbine blade according to claim 1, characterized in that: The fetal membrane (7) in step S3 comprises a bottom plate (701) and a supporting plate (702) vertically arranged on the bottom plate (701); the length direction of the supporting plate (702) is parallel to the direction from the lower ring edge (2) to the upper crown edge (1); a plurality of supporting plates (702) are provided, and the plurality of supporting plates (702) are arranged in pairs along the direction from the water inlet edge (3) to the water outlet edge (4); the upper surface of the supporting plate (702) serves as the upper surface of the fetal membrane (7); The fixing structure in step S3 comprises an upper connecting rib (8), a lower connecting rib and a bolt; the upper connecting rib (8), the physical model and the lower connecting rib are connected by bolts; the upper connecting rib (8) is arranged on the outer side of the physical model, one end of the upper connecting rib (8) is located on the processed flat sheet (9), and the other end is located on the processed warping sheet (10); the lower connecting rib is arranged on the inner side of the physical model and between two adjacent supporting plates (702); one end of the lower connecting rib is located on the processed flat sheet (9), and the other end is located on the processed warping sheet (10); a plurality of groups of fixing structures are arranged, and the plurality of groups of fixing structures are arranged in pairs along the direction from the water inlet edge (3) to the water outlet edge (4).

3. The method for processing a physical model of a super-large Francis turbine blade according to claim 2, characterized in that: In the step S3, the support plate (702) and the processed flat sheet (9) are positioned by a first groove and protrusion structure, and the support plate (702) and the processed warped sheet (10) are positioned by a second groove and protrusion structure.

4. The method for processing a physical model of a super-large Francis turbine blade according to claim 2, characterized in that: It also includes a vertically arranged connecting plate (703), through which two adjacent supporting plates (702) are connected; the top of the connecting plate (703) is lower than the top of the supporting plate (702); there are multiple connecting plates (703), and the multiple connecting plates (703) are arranged in pairs along the length direction of the supporting plate (702); and the lower connecting ribs are placed on at least two connecting plates (703).

5. The method for processing a physical model of a super-large Francis turbine blade according to claim 1, characterized in that: The upper surface of each supporting plate (702) is provided with a positioning line corresponding to the stepped decomposition line L2.

6. The method for processing a physical model of a super-large Francis turbine blade according to claim 1, characterized in that: In the step S1, when adjusting the position of the step-type decomposition line L2 along the x-axis direction, the adjustment is performed in multiples of 25 mm.

7. The method for processing a physical model of a super-large Francis turbine blade according to claim 1, characterized in that: The fetal membrane (7) in step S3 is a wooden product.

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