CN104646465B - Multi-section and synchronous torsion formation method of hollow blade - Google Patents

Abstract

The invention discloses a multi-section torsion forming method of a hollow blade, comprising the following steps: a. generating a blank model and a finished product model of the hollow blade; Section, forming a plurality of torsional sections parallel to the upper surface of the blade tenon at the corresponding position of the finished model; c, calculating the torsion center and torsion angle of each of the initial sections transformed to the corresponding torsion section; d, Provide a hollow blade to be processed, the hollow blade to be processed includes the plurality of initial sections; e, according to the corresponding torsion center and torsion angle, the plurality of initial sections are respectively twisted into the corresponding plurality of torsion section. Compared with the prior art, the invention can synchronously carry out the torsion forming of each section of the blade, improves the deformation precision, reduces the local deformation resistance, increases the forming speed, shortens the forming time and saves the tooling cost.

Description

Multi-section synchronous torsion forming method for hollow blades

technical field

The invention relates to a multi-section synchronous torsion forming method of a hollow blade, which belongs to the technical field of metal machining technology.

Background technique

The application of wide-chord hollow fan blades is the best choice for aero-engines to increase thrust-to-weight ratio and improve aero-engine performance (increase compressor turbulence margin, improve efficiency, enhance resistance to foreign object damage, increase engine thrust, reduce number of blades and reduce weight) effective means. The shape of the blade is mainly composed of the middle interlayer and the skins on both sides. The middle of the blade is a hollow closed structure of the truss structure. The blade adopts a forward and backward sweep design and is thin and variable in section. The tenon that connects the blisks.

In the prior art, the forming process of the hollow blade includes a push-bending forming process, and a hollow blade push-bending forming mold is used in conjunction with the above-mentioned process. According to the curved surface of the finished hollow blade, a mold with a cavity channel with openings on both sides is designed. , clamp the tenon of the blade and push the blade from one end of the cavity channel into the mold cavity, and the blade is forced to bend under the action of the inner surface of the mold cavity, and twists and deforms. The push-bending forming process can form a flat hollow blade blank into a complex torsion shape, so that it has the required torsion angle. The forming process is smooth and convenient, the speed is controllable, the deformation of each part is evenly distributed, and the production efficiency is high. However, in the push-bending forming process, the blade gradually undergoes torsional deformation from the tip to the root of the blade, and the deformation of the part of the blade that does not enter the push-bending mold during this forming process is out of control. If the torsion angle of the blade is large or the blade body is long, the resistance in the process of pushing forward the blade in the mold cavity is relatively large, and the part of the blade that does not enter the mold cavity will be squeezed and deformed, prone to compression instability, and eventually It is difficult to guarantee the shape accuracy of the blade after push-bending.

Contents of the invention

In order to solve at least one of the above-mentioned technical problems, the object of the present invention is to provide a hollow blade multi-section torsion forming method that can realize simultaneous multi-section torsion forming of the blade, and prevent the overall torsion of the blade from excessive local deformation resistance. The problem of poor forming effect of hollow blades.

In order to achieve the purpose of the above invention, one embodiment of the present invention provides a hollow blade multi-section torsion forming method, including the following steps:

a. Generate the blank model and finished product model of the hollow blade;

b. forming a plurality of initial sections parallel to the upper surface of the blade tenon on the blank model, and forming a plurality of torsion sections parallel to the upper surface of the blade tenon at corresponding positions of the finished model;

c. Calculating the torsion center and torsion angle of each of the initial cross-sections transformed to the corresponding torsion cross-section;

d. Provide a hollow blade to be processed, the hollow blade to be processed includes the plurality of initial sections;

e. According to the corresponding torsion centers and torsion angles, respectively torsion-shape the plurality of initial sections into the corresponding plurality of torsion sections.

As a further improvement of the present invention, the step "c, calculating the torsion center and torsion angle of each of the initial sections transformed to the corresponding torsion section" includes,

c1. Respectively determine the initial centerline of each of the initial section and the corresponding twisted centerline of the torsion section;

c2. According to the initial center line and the twisted center line, determine a twist center and a twist angle of each of the initial cross-sections transformed into the corresponding twisted cross-sections.

As a further improvement of the present invention, the initial centerline of the initial section is a straight line fitted from points on the initial section that are equidistant from the blade pot and the blade back; correspondingly, the twisted center of the twisted section The line is a straight line fitted from points equidistant from the torsion section to the leaf pot and the leaf back.

As a further improvement of the present invention, the twist center is the intersection of the initial centerline and the twisted centerline; the twist angle is the angle between the initial centerline and the twisted centerline.

As a further improvement of the present invention, the twist angle is not greater than 90°.

As a further improvement of the present invention, the step "d, providing a hollow blade to be processed, the hollow blade to be processed includes the plurality of initial cross-sections" also includes,

An antioxidant is coated on the surface of the hollow blade to be processed which has been coated with an antioxidant.

As a further improvement of the present invention, the step "d, providing a hollow blade to be processed, the hollow blade to be processed includes the plurality of initial cross-sections" also includes,

The hollow blade to be processed is heated to a twisting temperature.

As a further improvement of the present invention, the step "e, according to the corresponding torsion centers and torsion angles, respectively torsionally shape the plurality of initial sections into the corresponding plurality of torsion sections" also includes,

When the plurality of initial cross-sections are twisted and formed into the corresponding plurality of twisted cross-sections, the plurality of initial cross-sections are twisted synchronously.

As a further improvement of the present invention, the step "e, according to the corresponding torsion centers and torsion angles, respectively torsionally shape the plurality of initial sections into the corresponding plurality of torsion sections" specifically includes,

e1. Calculate the torsion distance of each initial section according to the corresponding torsion center and torsion angle;

e2. Set the reverse time;

e3, calculating the torsional velocity of each of the initial cross-sections;

e4. Synchronously twisting the multiple initial cross-sections at the torsion speed respectively to form the corresponding multiple twisted cross-sections.

As a further improvement of the present invention, the method also includes,

f. After each of the initial sections is torsionally formed into the corresponding torsion section, after a delay of a first period of time, a torsion forming working cycle is completed.

Compared with the prior art, the present invention has the following beneficial technical effects: the hollow blade multi-section synchronous torsion forming method can make the torsion forming of each section of the blade synchronously, and the torsion center, torsion angle, and torsion speed of each section are independently controlled , the accuracy of torsional deformation is improved while reducing the local deformation resistance, increasing the speed of blade torsional forming, and shortening the forming time; in addition, the number and position of the torsional section of the blade can be flexibly designed according to the specific dimensions of different blades, which is suitable for flexible applications. Tooling, saving tooling costs.

Description of drawings

Fig. 1 is a flowchart of a multi-section synchronous torsion forming method for hollow blades according to an embodiment of the present invention;

Fig. 2 is a schematic structural view of a torsion assembly according to an embodiment of the present invention;

Fig. 3 is a reference diagram for the use of a hollow blade multi-section synchronous torsion forming device according to an embodiment of the present invention;

Fig. 4 is a schematic diagram of a blank model and a finished model of a hollow blade according to an embodiment of the present invention;

Fig. 5 is a schematic diagram of determining the center of torsion and the torsion angle in Fig. 4;

FIG. 6 is a schematic diagram of the position of the torsion assembly in FIG. 2 .

detailed description

The present invention will be described in detail below in conjunction with specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, method, or functional changes made by those skilled in the art according to these embodiments are included in the protection scope of the present invention.

Referring to FIG. 1 , FIG. 1 is a flowchart of a multi-section synchronous torsion forming method for hollow blades according to an embodiment of the present invention. A hollow blade multi-section torsion forming method provided by an embodiment of the present invention includes the following steps:

a. Generate the blank model and finished product model of the hollow blade;

b. forming a plurality of initial sections parallel to the upper surface of the blade tenon on the blank model, and forming a plurality of torsion sections parallel to the upper surface of the blade tenon at corresponding positions of the finished model;

c. Calculating the torsion center and torsion angle of each of the initial cross-sections transformed to the corresponding torsion cross-section;

d. Provide a hollow blade to be processed, the hollow blade to be processed includes the plurality of initial sections;

e. According to the corresponding torsion centers and torsion angles, respectively torsion-shape the plurality of initial sections into the corresponding plurality of torsion sections.

The hollow blade multi-section torsion forming method provided by an embodiment of the present invention can independently control the torsion center, torsion angle, and torsion speed of each section, improve the accuracy of torsional deformation while reducing local deformation resistance, and improve blade torsion. The forming speed shortens the forming time; and the number of cross-sections and positions of the hollow blades can be flexibly designed according to the specific dimensions of different hollow blades, which is suitable for the application of flexible tooling and saves tooling costs.

In the above-mentioned torsion forming method, step c, calculating the torsion center and torsion angle of each of the initial cross-sections transformed to the corresponding torsion cross-section" includes,

c1. Respectively determine the initial centerline of each of the initial section and the corresponding twisted centerline of the torsion section;

c2. According to the initial center line and the twisted center line, determine a twist center and a twist angle of each of the initial cross-sections transformed into the corresponding twisted cross-sections.

In addition, the initial centerline of the initial cross-section is a straight line fitted from points on the initial cross-section that are equidistant from the blade pot and the leaf back; correspondingly, the twisted centerline of the twisted cross-section is the It is a straight line fitted by points equidistant from the leaf pot and the leaf back on the torsion section. In this way, a plurality of initial centerlines corresponding to a plurality of initial sections, and a plurality of twisted centerlines corresponding to a plurality of twisted sections can be obtained, so as to understand the change of each initial section. In addition, each center line is obtained by point fitting, which can guarantee its validity.

The intersection of each initial centerline and its corresponding twisted centerline is also the torsion center of each initial section; the angle between each initial centerline and its corresponding twisted centerline is also the initial The twist angle before and after the section is twisted. The twist angle is not greater than 90°.

In the above torsion forming method, the step "d, providing a hollow blade to be processed, the hollow blade to be processed includes the plurality of initial cross-sections" further includes,

The anti-oxidant is coated on the surface of the hollow blade to be processed, so as to avoid the oxidation of parts under high temperature and reduce the contact friction force between the hollow blade and the fixture. After the surface of the hollow blade to be processed is coated with an antioxidant, the hollow blade to be processed is heated to a twisting temperature. The torsion temperature is the temperature at which the hollow blade to be processed has the best ductility, and can be measured according to the material test of the hollow blade to be processed.

In the above torsion forming method, the step "e, according to the corresponding torsion center and torsion angle, respectively torsion forming the plurality of initial sections into the corresponding plurality of torsion sections" further includes,

When the plurality of initial cross-sections are twisted and formed into the corresponding plurality of twisted cross-sections, the plurality of initial cross-sections are twisted synchronously. In this way, the accuracy of torsional deformation can be enhanced, the local deformation resistance can be reduced, the speed of blade torsional forming can be improved, and the forming time can be shortened.

Step e specifically includes,

e1. Calculate the torsion distance of each initial section according to the corresponding torsion center and torsion angle;

e2. Set the reverse time;

e3, calculating the torsional velocity of each of the initial cross-sections;

e4. Synchronously twisting the multiple initial cross-sections at the torsion speed respectively to form the corresponding multiple twisted cross-sections.

In addition, in the above-mentioned torsion forming method, after step e is completed, step f is also included: after each of the initial cross-sections is torsion-formed into the corresponding torsion cross-section, after a delay of the first period of time, a torsion forming work is completed cycle. Delaying the first period of time can realize the use of the high temperature stress relaxation effect to reduce the springback deformation of the blade after torsion, thereby ensuring the quality of the torsion forming of the hollow blade.

Compared with the prior art, the present invention has the following beneficial technical effects: the hollow blade multi-section synchronous torsion forming method can make the torsion forming of each section of the blade synchronously, and the torsion center, torsion angle, and torsion speed of each section are independently controlled , the accuracy of torsional deformation is improved while reducing the local deformation resistance, increasing the speed of blade torsional forming, and shortening the forming time; in addition, the number and position of the torsional section of the blade can be flexibly designed according to the specific dimensions of different blades, which is suitable for flexible applications. Tooling, saving tooling costs.

In addition, referring to FIG. 2 , FIG. 2 is a schematic structural diagram of a torsion assembly according to an embodiment of the present invention. First, for clarity and simplicity of description, define the direction of the x-axis as the horizontal direction, define the direction of the y-axis perpendicular to the x-axis as the horizontal longitudinal direction, and define the plane where the x-axis and the y-axis are located as the horizontal plane, and the horizontal plane The vertical z-axis direction is the vertical direction. A torsion assembly 10 according to an embodiment of the present invention is used for torsion forming of hollow blades. The torsion assembly 10 includes a clamping portion 11 , a through hole 111 , a first adjustment rod 12 and a second adjustment rod 13 .

The clamping portion 11 has an upper surface 1121 and a lower surface (not marked) opposite to each other, the through hole 111 is disposed on the clamping portion 11 and penetrates through the upper surface 1121 of the clamping portion 11 and the lower surface. The through hole 111 allows the hollow blade to pass through, and enables the twist assembly 10 to be fitted to any cross-section of the hollow blade that is parallel to the upper plane of the tenon of the blade.

The first adjusting rod 12 includes a first end 121 and a third end 123 oppositely arranged, and the first end 121 is rotatably arranged on the clamping portion 11; the second adjusting rod 13 includes an oppositely arranged third end 123. The second end 132 and the fourth end 134 are rotatably disposed on the clamping portion 11 .

Wherein, when the hollow blade is placed in the through hole 111, the first adjusting rod 12 and the second adjusting rod 13 can move relative to the clamping part 11 to control the clamping part 11 Twisted to achieve torsional shaping of the hollow blades.

The torsion assembly according to one embodiment of the present invention can realize the torsion forming of any cross-section of the hollow blade, has a simple structure, and is convenient for control and operation.

Specifically, the movement trajectories of the first adjusting rod 12 and the second adjusting rod 13 are located in the same plane and parallel to the upper surface of the tenon of the hollow blade, so that the clamping part 11 can The force is uniform to avoid non-plane torsion deviation.

The torsion assembly 10 also includes a first base 15 , a first connecting piece 14 , a second base 17 , a second connecting piece 16 and a horizontal sliding slot 113 .

The second adjusting rod 13 can slide along the horizontal sliding groove 113 . Specifically, the second adjusting rod 13 is connected to the second base 17 through the second connecting member 16, and the second adjusting rod 13 can use the second connecting member 16 as an axis relative to the second The base 17 rotates; in addition, the second base 17 is slidably locked in the horizontal slide groove 113, and then, the second adjusting rod 13 can be relatively rotated relative to the clamping part 11 It can also slide relatively. In this way, during the torsion forming process of the hollow blade, the second adjusting rod 13 can move at a uniform speed on the same straight line, which not only facilitates the control of the moving speed of the second adjusting rod 13, but also improves the stability of the hollow blade. Torsional deformation accuracy reduces local deformation resistance.

Furthermore, in the horizontal direction, the length of the horizontal sliding groove 113 is not less than the length of the through hole 111, so as to ensure the relative sliding range of the second adjusting rod 13 relative to the clamping part 11, and enhance the torsion Component adjustability.

The first adjusting rod 12 is rotatably connected to the first base 15 through the first connecting member 14, and the first base 15 is arranged on the clamping part 11. When the clamping When the part 11 is twisted, the position of the first base 15 relative to the clamping part 11 is fixed. Through such an arrangement, the first adjusting rod 12 can be used to drive and twist, and at the same time, it can also play a role of position limitation. The first adjusting rod 12 can define the relative displacement range of the clamping part 11, so as to avoid The clamping part slips sideways.

In addition, the first base 15 can also be set to be detachably connected to the clamping part 11 for replacement; (shown), when the torsion forming is performed, the fixing member fixedly connects the first base 15 to the best position of the clamping portion 11 .

In the horizontal direction, the first adjusting rod 12 and the second adjusting rod 13 are respectively arranged on both sides of the torsion center of the hollow blade, so as to respectively give torsion force on both sides of the torsion center of the hollow blade , to ensure the reverse effect.

The first adjusting rod 12 and the second adjusting rod 13 are arranged on the same side of the clamping part 11, and in the embodiment shown in the figure, both are arranged on the horizontal and longitudinal sides of the clamping part 11. Front side 1141. Certainly, the first adjusting rod 12 and the second adjusting rod 13 may also be separately disposed on the opposite front side 1141 and rear side of the clamping portion 11 (not marked in the figure).

The first adjusting rod 12 and/or the second adjusting rod 13 can be moved horizontally to apply torsional power to the clamping portion 11, and the first adjusting rod 12 and/or the second adjusting rod 12 can also be moved The two adjusting rods 13 are configured to be adjustable in length, so as to exert torsional force on the clamping portion 11 by adjusting the length.

In addition, the through hole 111 can be set in a specific shape as required. In the embodiment shown in the figure, the through hole 111 is set in a rectangular shape. Preferably, the width of the through hole 111 in the horizontal and longitudinal direction is slightly larger than the distance between the blade pot and the blade back on the hollow blade.

Referring to FIG. 3 , FIG. 3 is a reference diagram for use of a hollow blade multi-section synchronous torsion forming device according to an embodiment of the present invention.

An embodiment of the present invention also provides a multi-section synchronous torsion forming device for a hollow blade, which is used for the torsion forming of the hollow blade. The hollow blade includes a plurality of sections parallel to the upper plane of the tenon of the blade. The device includes A plurality of torsion assemblies 10 as described above, the plurality of torsion assemblies 10 are stacked, the plurality of torsion assemblies 10 respectively correspond to the multiple sections of the hollow blade and are configured to work synchronously.

The hollow blade multi-section synchronous torsion forming device provided by an embodiment of the present invention can realize the controllable time and speed of the torsion process; the torsion forming of each section of the blade can be carried out synchronously, and the torsion center, torsion angle, The torsional speed is independently controlled, the accuracy of torsional deformation is improved while the local deformation resistance is reduced, the torsion forming speed of the blade is increased, and the forming time is shortened; in addition, the number and position of the blade sections can be flexibly designed according to the specific dimensions of different blades , suitable for the application of flexible tooling, saving tooling costs.

The hollow blade multi-section synchronous torsion forming device may also include a control system for controlling the movement of the first adjusting rod 12 and the second adjusting rod 13, such as twisting speed, twisting time and so on.

Referring to Fig. 4 to Fig. 6, and in conjunction with the embodiment of the torsion assembly shown in Fig. 2, the multi-section torsion forming method of the hollow blade of the present invention will be described in detail. Fig. 4 is the blank model and finished product of the hollow blade according to an embodiment of the present invention Schematic diagram of the model; Figure 5 is a schematic diagram of the determination of the torsion center and torsion angle in Figure 4; Figure 6 is a schematic diagram of the position of the torsion assembly in Figure 2.

Firstly, a blank model 100 of the hollow blade is generated according to the curved surface of the blank of the hollow blade; a finished product model 200 of the hollow blade is generated according to the curved surface of the finished product of the hollow blade;

Form a plurality of initial cross-sections parallel to the upper surface of the tenon of the blade on the blank model 100. In the embodiment shown in FIG. 5 torsion sections J12, J22, J32, J42, J52 parallel to the upper surface of the tenon of the blade are formed at the corresponding positions of the finished model 200, wherein, the initial sections J11, J21, J31, J41, J51 and the torsion sections J12, J22, J32, J42, and J52 are in one-to-one correspondence;

Determine the respective initial centerlines of the initial sections J11, J21, J31, J41, and J51. In the embodiment shown in FIG. 4, the initial centerlines of the initial sections J11, J21, J31, J41, and J51 coincide , is the initial centerline L0; respectively determine the respective twisted centerlines L1, L2, L3, L4, L5 of the corresponding torsion sections J12, J22, J32, J42, J52, the initial centerline L0 and each twisted Center lines L1, L2, L3, L4, L5 intersect to obtain torsion centers O1, O2, O3, O4, O5 and torsion angles α1, α2, α3, α4, α5 respectively;

Provide a hollow blade to be processed, the surface of each hollow blade to be processed is coated with an antioxidant, the hollow blade to be processed includes the 5 initial sections, and 5 corresponding torsion assemblies 10 are provided; The tenons of the hollow blades to be processed are fixedly arranged, and the blade parts of the hollow blades to be processed are sequentially passed through the through holes 111 of the five torsion assemblies 10, so that the five torsion assemblies 10 correspond to the five initial cross-sections respectively. , and heated to the torsion temperature for torsion forming work;

Then, according to the torsion centers O1, O2, O3, O4, O5 and torsion angles α1, α2, α3, α4, α5, the 5 initial sections are respectively torsionally formed into the corresponding 5 torsion sections;

Specifically, according to the torsion center and the torsion angle, and in combination with the distance relationship between the components of the torsion assembly 10, the torsion distance is calculated, for example, the torsion distance of the first adjusting rod 12 is S*tanα+H* csc α-H, the torsion distance of the second adjusting rod 13 is (D-S)*tan α-H*csc α+H; setting makes the torsion time of each torsion assembly 10, preferably the torsion time of each torsion assembly 10 equal to Same; then according to the torsion time and the torsion distance, determine the movement speed of each first adjustment rod 12 and each second adjustment rod 13;

During the torsion forming process, the 5 torsion components 10 are synchronously operated to drive the corresponding 5 initial sections to be respectively synchronously torsion formed into corresponding torsion sections;

After the above process is completed, each torsion assembly 10 is kept in position for a first period of time, and then the torsion assembly 10 is detached from the hollow blade to complete a torsion forming working cycle.

Compared with the prior art, the present invention has the following beneficial technical effects: the torsion forming of each section of the blade can be carried out synchronously, the torsion center, torsion angle, and torsion speed of each section are independently controlled, and the accuracy of torsional deformation is improved at the same time The local deformation resistance is reduced, the torsion forming speed of the blade is increased, and the forming time is shortened. The number and position of the torsional section of the blade can be flexibly designed according to the specific dimensions of different blades, which is suitable for the application of flexible tooling and saves tooling costs.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship indicated by "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device or element Must be in a particular orientation, be constructed in a particular orientation, and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

The detailed descriptions listed above are only specific descriptions of feasible implementations of the present invention, and they are not intended to limit the scope of protection of the present invention. All equivalent implementations or changes that do not depart from the technical spirit of the present invention shall be Included within the protection scope of the present invention.

Claims (10)

1. A hollow blade multi-section torsion forming method is characterized in that, comprising the following steps: a. Generate the blank model and finished product model of the hollow blade; b. forming a plurality of initial sections parallel to the upper surface of the blade tenon on the blank model, and forming a plurality of torsion sections parallel to the upper surface of the blade tenon at corresponding positions of the finished model; c. Calculating the torsion center and torsion angle of each of the initial cross-sections transformed to the corresponding torsion cross-section; d. Provide a hollow blade to be processed, the hollow blade to be processed includes the plurality of initial sections; e. According to the corresponding torsion centers and torsion angles, respectively torsion-shape the plurality of initial sections into the corresponding plurality of torsion sections. 2. The hollow blade multi-section torsional forming method according to claim 1, characterized in that the step "c, calculating the twist center and twist angle of each of the initial sections transformed to the corresponding torsional section" includes , c1. Respectively determine the initial centerline of each of the initial section and the corresponding twisted centerline of the torsion section; c2. According to the initial center line and the twisted center line, determine a twist center and a twist angle of each of the initial cross-sections transformed into the corresponding twisted cross-sections. 3. The hollow blade multi-section torsion forming method according to claim 2, wherein the initial centerline of the initial section is fitted by points equidistant from the initial section to the blade pot and the blade back Correspondingly, the twisted centerline of the twisted section is a straight line fitted from points on the twisted section that are equidistant from the leaf pot and the leaf back. 4. The hollow blade multi-section torsion forming method according to claim 3, wherein the torsion center is the intersection of the initial centerline and the twisted centerline; the torsion angle is the intersection of the initial center The angle between the line and the twisted centerline. 5 . The multi-section torsion forming method for hollow blades according to claim 4 , wherein the torsion angle is not greater than 90°. 6. The multi-section torsion forming method of a hollow blade according to claim 1, wherein the step "d, providing a hollow blade to be processed, the hollow blade to be processed includes the plurality of initial cross-sections" also includes , Antioxidant is coated on the surface of the hollow blade to be processed. 7. The multi-section torsional forming method of a hollow blade according to claim 6, wherein the step "d, providing a hollow blade to be processed, the hollow blade to be processed includes the plurality of initial cross-sections" also includes , The hollow blade to be processed, which has been coated with an anti-oxidant, is heated to a twisting temperature. 8. The hollow blade multi-section torsion forming method according to claim 1, characterized in that in the step "e, according to the corresponding torsion centers and torsion angles, the multiple initial sections are respectively torsion formed into the corresponding The multiple torsion sections" also include, When the plurality of initial cross-sections are twisted and formed into the corresponding plurality of twisted cross-sections, the plurality of initial cross-sections are twisted synchronously. 9. The hollow blade multi-section torsion forming method according to claim 8, characterized in that in the step "e, according to the corresponding torsion centers and torsion angles, the plurality of initial sections are respectively torsion formed into the corresponding The multiple torsion sections" specifically include, e1. Calculate the torsion distance of each initial section according to the corresponding torsion center and torsion angle; e2. Set the reverse time; e3, calculating the torsional velocity of each of the initial cross-sections; e4. Synchronously twisting the multiple initial cross-sections at the torsion speed respectively to form the corresponding multiple twisted cross-sections. 10. The hollow blade multi-section torsion forming method according to claim 1, characterized in that the method further comprises: f. After each of the initial sections is torsionally formed into the corresponding torsion section, after a delay of a first period of time, a torsion forming working cycle is completed.