Cascade structure forming die and forming method

Abstract

The invention discloses a blade grid structure forming die and method, and relates to the technical field of blade grid structure forming, the blade grid structure forming die comprises a first die, a second die and a third die, the first die comprises a first upper half die and a first lower half die; the bottom surface of the first upper half die is provided with a first upper concave cavity and a first upper positioning groove which corresponds to one side of the first upper concave cavity in the length direction and is communicated with the first upper concave cavity, and the top surface of the first lower half die is provided with a first lower concave cavity and a first lower positioning groove which corresponds to one side of the first lower concave cavity in the length direction and is communicated with the first lower concave cavity; the first upper half die and the first lower half die can be matched so that the first upper concave cavity and the first lower concave cavity can jointly define a first grid blade cavity matched with the skin layer in outer contour shape and size, and the first upper positioning groove and the first lower positioning groove can jointly define a first blade handle positioning hole capable of positioning the peripheral wall of the other end of the metal blade handle in a matched mode. According to the method, the defects of the blade grid forming process can be reduced, sufficient connection strength between parts of the blade grid is ensured, the blade grid manufacturing efficiency and precision are improved, and the service life of the blade grid is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of blade cascade structure molding, and in particular to a blade cascade structure molding die and a molding method. Background Art

[0002] The gust simulator is an important device for wind tunnel tests to study the dynamic characteristics of aircraft in gust environments (unsteady loads, flight stability, structural strength and flight control). It makes high-frequency reciprocating swings in the flow field to make the flow field unstable, simulating the high-altitude gust environment. The gust simulator consists of a drive device and a cascade. The existing cascade of the gust simulator is made of titanium alloy. The domestic trial production cannot reach the foreign technical level. It will be damaged after a short operation. It is currently impossible to manufacture it in China and needs to be purchased from abroad.

[0003] In order to solve this problem, a Chinese patent (authorization announcement number CN 221445380 U, authorization announcement date 2024.07.30) discloses a gust simulation device, which specifically discloses that the blade grid includes a support frame, a lightweight material and a skin layer, the support frame is fitted and fixed on the petiole; the lightweight material is filled in the support frame; the skin layer is wrapped around the support frame and the lightweight material. The support frame includes a main support frame, an auxiliary support frame and a wrapping cloth, and the main support frame and the auxiliary support frame are connected as a whole by wrapping the wrapping cloth; the main support frame has a mounting hole with the same shape as the petiole, so that the petiole is inserted and fixed in the mounting hole; the auxiliary support frame is U-shaped, and the middle part of the auxiliary support frame is fitted with the main support frame. It can be seen that the blade structure is a beam structure, which consists of two parts: the main support in the axial direction and the auxiliary support in the chord direction. Considering that the blade needs to operate at a high frequency of 25Hz, it will be subject to periodic and alternating aerodynamic loads and inertial loads. Therefore, the various components that constitute the blade need to have sufficient connection strength and fewer process defects, otherwise the fatigue life of the blade will be affected. For this kind of blade structure with multiple closed cavities, the main support frame and the auxiliary support frame are connected by wrapping cloth. There is still no relevant molding method in China, and there is no relevant experience to learn from. Therefore, it is necessary to design a new blade structure molding method to solve this problem.

[0004] Therefore, how to provide a blade structure forming mold and forming method that can reduce the process defects of forming blades, ensure sufficient connection strength between the various parts of the blades, improve the manufacturing efficiency and manufacturing accuracy of the blades, and increase the service life of the blades is an urgent problem that technical personnel in this field need to solve. Summary of the invention

[0005] In view of this, the present invention proposes a blade cascade structure forming mold and a forming method, aiming to solve the technical problems that the traditional blade cascade manufacturing method is prone to process defects and has low manufacturing efficiency and poor manufacturing accuracy.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] On one hand, the present invention provides a blade cascade structure forming mold, the blade cascade structure includes a metal blade stalk and a blade, the blade cascade includes a support frame coaxially sleeved on one end of the metal blade stalk and a skin layer wrapped on the outer surface of the support frame; including:

[0008] Mold 1, the mold 1 comprises an upper mold 1 and a lower mold 1; the bottom surface of the upper mold 1 is provided with an upper concave cavity 1 and an upper positioning groove 1 corresponding to one side of the upper concave cavity 1 in the length direction and connected to the upper concave cavity 1, and the top surface of the lower mold 1 is provided with a lower concave cavity 1 and a lower positioning groove 1 corresponding to one side of the lower concave cavity 1 in the length direction and connected to the lower concave cavity 1;

[0009] The upper half mold 1 and the lower half mold 1 can be adapted to form a matching mold so that the upper concave cavity 1 and the lower concave cavity 1 together enclose a blade cavity 1 that is adapted to the outer contour shape and size of the skin layer, and the upper positioning groove 1 and the lower positioning groove 1 together enclose a petiole positioning hole 1 that can adapt to position the outer peripheral wall of the other end of the metal petiole.

[0010] When the blade grid structure forming mold of the present invention is used, the lower concave cavity of the lower half mold is used to adapt the arrangement and positioning of the blade grid, and the lower positioning groove of the lower half mold is used to install and position the metal petiole, which can improve the accuracy of assembly and positioning; when the mold is closed and pressed, the metal petiole is further accurately positioned through the petiole positioning hole formed by the upper positioning groove and the lower positioning groove, and the blade cavity is further used to ensure that the skin layer is evenly, accurately and firmly combined with the supporting frame, thereby improving the molding accuracy of the blade shape and size, thereby realizing high-precision assembly and pressing molding of the metal petiole and the blade, and improving the operation stability.

[0011] As a further improvement of the above technical solution, the support skeleton includes a main support body arranged along the length direction of the metal petiole and wrapped around one end of the metal petiole, and an auxiliary support body 1 and an auxiliary support body 2 arranged one by one on both sides of the width direction of the main support body; the auxiliary support body 1 and the auxiliary support body 2 are both multiple, and the multiple auxiliary support bodies 1 and the multiple auxiliary support bodies 2 are arranged in sequence along the length direction of the main support body, and are all connected to the main support body by winding with unidirectional cloth, together forming a support skeleton structure;

[0012] The inner surface of the grating blade cavity 1 is the profile 1 for laying the skin layer; the end of the grating blade cavity 1 corresponding to the petiole positioning hole 1 is the main support body placement area A for adapting to placing the main support body; the side of the grating blade cavity 1 corresponding to the main support body placement area A is the auxiliary support body one placement area A for adapting to laying multiple auxiliary support bodies one; the other side of the grating blade cavity 1 corresponding to the main support body placement area A is the auxiliary support body two placement area A for adapting to laying multiple auxiliary support bodies two.

[0013] The beneficial effect of the above technical solution is that the inner surface of the cascade blade cavity 1 can ensure the curing and shaping accuracy of the skin layer, thereby ensuring the surface contour accuracy of the cascade blade.

[0014] As a further improvement of the above technical solution, it also includes a mold 2 for preforming the cascade structure, the mold 2 includes an upper mold 2 and a lower mold 2; the bottom surface of the upper mold 2 is provided with an upper cavity 2 and an upper positioning groove 2 corresponding to one side of the length direction of the upper cavity 2 and connected to the upper cavity 2, and the top surface of the lower mold 2 is provided with a lower cavity 2 and a lower positioning groove 2 corresponding to one side of the length direction of the lower cavity 2 and connected to the lower cavity 2;

[0015] The upper half mold 2 and the lower half mold 2 can be adapted to form a matching mold so that the upper concave cavity 2 and the lower concave cavity 2 together enclose a grating blade cavity 2 which has the same shape as the outer contour of the grating blade and is used to prepare a preformed grating blade, and the upper positioning groove 2 and the lower positioning groove 2 together enclose a petiole positioning hole 2 which can be adapted to position the outer peripheral wall of the other end of the metal petiole; the size of the grating blade cavity 2 is smaller than the size of the grating blade cavity 1, so as to provide reserved space for the reserved skin that is laid in the mold 1 and wrapped around the outer surface of the preformed grating blade.

[0016] The beneficial effect of the above technical solution is that mold 2 can be used to prepare preformed grating blades fixedly connected with metal petioles, and the outer dimensions of the prepared preformed grating blades are smaller than the outer dimensions of the final grating structure. The prepared preformed grating blades can be used as components for further processing of the grating structure and filled into mold 1 for secondary wrapping of the skin layer, thereby improving the structural strength and molding accuracy of the grating structure.

[0017] As a further improvement of the above technical solution, the inner surface of the second grating blade cavity is the second shaped surface for laying the skin layer; the end of the second grating blade cavity corresponding to the second petiole positioning hole is the main support body placement area B for adapting to placing the main support body; the side of the second grating blade cavity corresponding to the main support body placement area B is the auxiliary support body one placement area B for adapting to laying multiple auxiliary support bodies one in layers; the other side of the second grating blade cavity corresponding to the main support body placement area B is the auxiliary support body two placement area B for adapting to laying multiple auxiliary support bodies two in layers.

[0018] As a further improvement of the above technical solution, it also includes multiple groups of internal expansion core molds; the auxiliary support body 1 and the auxiliary support body 2 are both U-shaped; the U-shaped grooves of the auxiliary support body 1 and the auxiliary support body 2 can be removably adapted to be filled with the corresponding internal expansion core molds, so as to support the corresponding auxiliary support body 1, the auxiliary support body 2 and the skin layer through the internal expansion core molds during molding.

[0019] The beneficial effects of the above technical solution are: the internal expansion core mold filled in the inner cavity of auxiliary support body one and auxiliary support body two can play a supporting role and provide internal pressure during the molding process to improve the molding accuracy and molding quality of the blade skin layer; the internal expansion core mold is a detachable structure and can be taken out from the U-shaped groove of auxiliary support body one and auxiliary support body two after the pre-formed blade is made, so as to finally obtain a blade structure with a cavity structure.

[0020] As a further improvement of the above technical solution, the two opposite side walls in the U-shaped groove of the auxiliary support body one and the auxiliary support body two are provided with grooves; each group of the internal expansion core molds includes internal expansion core mold one, internal expansion core mold two and internal expansion core mold three; the grooves on the two opposite side walls in the U-shaped groove of the auxiliary support body one and the auxiliary support body two are respectively and removably adapted to be filled with the corresponding internal expansion core mold one and the internal expansion core mold three, and the internal expansion core mold two is removably adapted to be filled in the U-shaped groove of the auxiliary support body one and the auxiliary support body two, and corresponds between the corresponding internal expansion core mold one and the internal expansion core mold three.

[0021] The beneficial effects of the above technical solution are: the inner expansion core mold 1 and the inner expansion core mold 3 are filled in the grooves of the U-shaped groove side walls of the auxiliary support body 1 and the auxiliary support body 2, which further improves the support strength; when taking out, the inner expansion core mold 2 located between the inner expansion core mold 1 and the inner expansion core mold 3 can be taken out directly first, and then the inner expansion core mold 1 and the inner expansion core mold 3 can be taken out separately.

[0022] Another aspect of the present invention provides a blade cascade structure forming method, comprising the blade cascade structure forming mold, wherein the forming steps are:

[0023] S1: using mold 1 to prepare a cascade structure; the molding material is prepreg; the skin layer includes a non-working surface skin and a working surface skin integrally connected to the non-working surface skin; the non-working surface skin is laid on the inner surface layer of the lower positioning groove 1 of the lower half mold 1, and vacuumed and compacted to form the non-working surface of the cascade blade;

[0024] S2: Fill the inner cavity of the support frame with compressible lightweight support material; coaxially sleeve the support frame on one end of the metal petiole; place the other end of the metal petiole in the lower positioning groove 1 for positioning, and lay the support frame adaptation layer on the non-working surface skin in the lower concave cavity 1; fold the working surface skin and lay it on the support frame and the lightweight support material to form the working surface of the grating blade;

[0025] S3: Fit the upper mold half 1 onto the lower mold half 1 to position the other end of the metal petiole in the petiole positioning hole 1, and fit the upper concave cavity 1 of the upper mold half 1 onto the working surface skin to seal the grating blade to be formed in the grating blade cavity 1, control the external dimensions of the lightweight supporting material to control the compression amount, close the mold, heat and solidify it as a whole, and press it into a grating structure.

[0026] As a further improvement of the above technical solution, S2 specifically includes the following steps:

[0027] S21: The inner bottom surface of the U-shaped groove of each auxiliary support body 1 and auxiliary support body 2 is fitted with a unidirectional cloth, and both ends of each unidirectional cloth extend to the outside of the U-shaped cavity of the corresponding auxiliary support body 1 or auxiliary support body 2 to form a working surface connection end and a non-working surface connection end, and a compressible lightweight support material is filled in the U-shaped groove of each auxiliary support body 1 and auxiliary support body 2. After the unidirectional cloth wrapping and lightweight support material filling work are completed, the unidirectional cloth is evacuated for standby use;

[0028] S22: laying a plurality of auxiliary support bodies 1 in sequence in the auxiliary support body 1 placement area A, laying a plurality of auxiliary support bodies 2 in sequence in the auxiliary support body 2 placement area A, and making the non-working surface connection end of the unidirectional cloth wrapping the auxiliary support body 1 and the non-working surface connection end of the unidirectional cloth wrapping the corresponding auxiliary support body 2 butt-joined with each other and laid in layers on the non-working surface skin;

[0029] S23: The main support body is coaxially sleeved and fixed on one end of the metal petiole; the other end of the metal petiole is correspondingly placed in the lower positioning groove 1 for positioning, and the main support body is adapted to be placed in the main support body placement area A and laid on the non-working surface skin and the corresponding non-working surface unidirectional cloth; after the layer laying is completed, the whole is vacuumed;

[0030] S24: The working surface connection end of the unidirectional cloth wrapping the auxiliary support body one and the working surface connection end of the unidirectional cloth wrapping the corresponding auxiliary support body two are butted together and laid layer by layer on the main support body; the working surface skin is folded and covered on the support frame, auxiliary support body one, auxiliary support body two, lightweight support material and unidirectional cloth.

[0031] Another aspect of the present invention provides a blade cascade structure forming method, comprising the blade cascade structure forming mold, wherein the forming steps are:

[0032] S10: using mold 2 to prepare a preformed cascade blade; the molding material is prepreg; the skin layer includes a non-working surface skin, a working surface skin and a reserved skin; the working surface skin is cured and molded separately by an autoclave or a vacuum process method and then reserved; the non-working surface skin is laid on the inner surface layer of the second lower concave cavity of the second lower mold half, and vacuumed and compacted;

[0033] S20: The bottom surfaces of the U-shaped grooves of the auxiliary support body 1 and the auxiliary support body 2 are both wrapped with unidirectional cloth, and both ends of each unidirectional cloth extend to the outside of the U-shaped cavity of the corresponding auxiliary support body 1 or the auxiliary support body 2 to form a working surface connection end and a non-working surface connection end, and the U-shaped grooves of the auxiliary support body 1 and the auxiliary support body 2 are filled with an internal expansion core mold; after the unidirectional cloth wrapping and the internal expansion core mold filling work are completed, vacuum is evacuated for standby use;

[0034] S30: laying a plurality of auxiliary support bodies 1 in sequence in the auxiliary support body 1 placement area B, laying a plurality of auxiliary support bodies 2 in sequence in the auxiliary support body 2 placement area B, and making the non-working surface connection end of the unidirectional cloth wrapping the auxiliary support body 1 and the non-working surface connection end of the unidirectional cloth wrapping the corresponding auxiliary support body 2 butt-joined with each other and laid in layers on the non-working surface skin;

[0035] S40: The main support body is coaxially sleeved and fixed on one end of the metal petiole; the other end of the metal petiole is correspondingly placed in the lower positioning groove 2 for positioning, and the main support body is adapted to be placed in the main support body placement area B and layered on the non-working surface skin and the non-working surface connection end of the one-way cloth; after the layering is completed, the whole is vacuumed;

[0036] S50: butting the working surface connection end of the unidirectional cloth wrapped around the auxiliary support body 1 and the working surface connection end of the unidirectional cloth wrapped around the corresponding auxiliary support body 2 together and layering them on the main support body; closing the upper half mold 2 and the lower half mold 2, heating and curing them to form a cured assembly;

[0037] S60: after curing, the inner expansion core mold is taken out, and the cured working surface skin is bonded to the cured assembly in step S50 to form a preformed cascade blade fixedly connected with a metal blade handle;

[0038] S70: Using mold one to make a blade grid structure; laying the non-working surface of the reserved skin on the inner surface of the lower concave cavity one of the lower half mold one, vacuuming and compacting, fitting the manufactured preformed blade into the lower concave cavity one and fitting the metal petiole into the lower positioning groove one, laying the working surface of the reserved skin on the surface of the manufactured preformed blade, closing the upper half mold one and the lower half mold one, heating and curing to form the blade grid structure.

[0039] Another aspect of the present invention provides a blade cascade structure forming method, comprising the blade cascade structure forming mold, wherein the forming steps are:

[0040] S100: using mold 2 to prepare a preformed cascade blade; the molding material is prepreg; the skin layer includes a non-working surface skin, a working surface skin and a reserved skin; the working surface skin is cured and molded separately by an autoclave or a vacuum process method and then reserved; the non-working surface skin is laid on the inner surface layer of the lower concave cavity 2 of the lower half mold 2, and vacuumed and compacted;

[0041] S200: laying a unidirectional fabric on the non-working surface skin corresponding to the lower positioning groove 2, the unidirectional fabric being arranged in a U-shape with the U-shaped opening facing upward, so as to define a main support body placement area B in the U-shaped groove corresponding to the unidirectional fabric in the lower concave cavity 2;

[0042] S300: The main support body is coaxially sleeved and fixed on one end of the metal petiole; the other end of the metal petiole is correspondingly placed in the lower positioning groove 2 for positioning, and the main support body is adapted to be placed in the main support body placement area B and laid on the non-working surface skin and the bottom surface of the unidirectional cloth U-shaped groove; after the layer laying is completed, the whole is vacuumed;

[0043] S400: Wrap the auxiliary support body 1 and the auxiliary support body 2 on the corresponding internal expansion core mold and evacuate them for standby; remove the auxiliary support body 1 and the auxiliary support body 2 from the internal expansion core mold; sequentially lay a plurality of auxiliary support bodies 1 in the auxiliary support body 1 placement area B, and sequentially lay a plurality of auxiliary support bodies 2 in the auxiliary support body 2 placement area B, and assemble them with the corresponding unidirectional fabrics, and fill the internal expansion core mold into the U-shaped groove of the corresponding auxiliary support body 1 and the auxiliary support body 2;

[0044] S500: butting the working surface connection end of the unidirectional cloth wrapped around the auxiliary support body 1 and the working surface connection end of the unidirectional cloth wrapped around the corresponding auxiliary support body 2 together and layering them on the main support body; closing the upper half mold 2 and the lower half mold 2, heating and curing them to form a cured assembly;

[0045] S600: after curing, the inner expansion core mold is taken out, and the cured working surface skin is bonded to the cured assembly in step S50 to form a preformed cascade blade fixedly connected with a metal blade handle;

[0046] S700: Use mold one to make a blade cascade structure; lay the non-working surface of the reserved skin on the inner surface of the lower concave cavity one of the lower half mold one, vacuum compaction is performed, the manufactured preformed cascade blade is fitted into the lower concave cavity one and the metal petiole is fitted into the lower positioning groove one, the working surface of the reserved skin is laid on the surface of the manufactured preformed cascade blade, the upper half mold one and the lower half mold one are molded together, and heating and curing are performed to form the blade cascade structure.

[0047] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a blade cascade structure forming mold and a forming method, which have the following advantages and beneficial effects:

[0048] 1. The present invention adopts a unidirectional cloth winding method to realize the connection between the main support body and multiple auxiliary support bodies 1 and auxiliary support bodies 2. Compared with traditional adhesive bonding, it has higher connection strength, and the unidirectional cloth and the working surface skin and the non-working surface skin are pressed, heated and cured to form an integrated structure, so that the overall blade grid structure has higher connection stability and greatly improves durability.

[0049] 2. In order to solve the molding problem of the blade cascade structure with multiple enclosed cavities, the present invention can reserve several layers of skin (working surface skin and non-working surface skin) and use mold 2 and mold 1 for secondary integrated curing molding. In addition, by internally designing an internal expansion core mold, auxiliary support body 1 and auxiliary support body 2 are wrapped on the internal expansion core mold, connected to the main support through unidirectional winding, and internal pressure is provided during the mold closing and pressing process, thereby improving the molding effect and molding accuracy of the skin layer; and mold 2 is used to integrally solidify and mold the metal petiole, support frame and non-working surface skin, so that the preformed grating blade has an opening in the working surface skin direction, and the internal expansion core mold can be taken out from the opening direction after molding; then the working surface skin is molded by a hot autoclave and set aside after curing; in mold one, several reserved layers of whole non-working surface skin are laid in the lower concave cavity one of mold one, and then the cured preformed grating blade overall surface layer is covered with gel coat and put into mold one, and then the cured working surface skin is placed in mold one, and finally the reserved layers of whole skin working surfaces are wrapped on the grating surface, and mold one is closed and heated and cured to complete the secondary grating curing and molding. Lightweight supporting materials can also be used to fill the inner cavity of the blade. By controlling the outer dimensions of the lightweight supporting materials, the amount of pressure can be controlled, and all components can be solidified as one, which can reduce blade process defects, ensure that the various components of the blade have sufficient connection strength, improve the blade manufacturing efficiency and manufacturing accuracy, and increase the service life of the blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0051] Figure 1 Schematic diagram of the front view of the cascade structure;

[0052] Figure 2 Schematic diagram of the cascade structure cross section;

[0053] Figure 3 Figure 2 A schematic diagram of the structure enlargement in the middle;

[0054] Figure 4 Schematic diagram of the cascade structure support framework;

[0055] Figure 5 Schematic diagram of the connection state of auxiliary support body 1, auxiliary support body 2 and main support body of the cascade structure;

[0056] Figure 6 The skin layer of the cascade structure is divided into a working surface skin and a non-working surface skin structure schematic diagram;

[0057] Figure 7 Schematic diagram of the connection state of the auxiliary support body 1 of the cascade structure and the unidirectional cloth wrapped and wrapped;

[0058] Figure 8 A schematic diagram of the auxiliary support body of the cascade structure being connected with the unidirectional cloth wrapped and filled with an internal expansion core mold;

[0059] Fig. 9 A schematic diagram of the structure of an internal expansion core mold of a blade cascade structure forming mold of the present invention;

[0060] Fig.10 Schematic diagram of auxiliary support body 1, auxiliary support body 2, unidirectional fabric and inner expansion core mold layer laid in lower concave cavity 2 of mold 2;

[0061] Fig.11 Schematic diagram of the auxiliary support body 1, the auxiliary support body 2, the unidirectional fabric and the inner expansion core mold in the lower concave cavity 2 after the layer is laid;

[0062] Fig.12 Schematic diagram of the state in which the metal petiole and the main support body layer are laid in the main support body placement area B and the metal petiole is positioned in the lower positioning groove 2;

[0063] Fig.13 Schematic diagram of the state where the unidirectional fabric is U-shaped and laid on the non-working surface skin in the lower concave cavity 2;

[0064] Fig.14 Schematic diagram of the state where the metal petiole and the main support layer are laid in the main support placement area B and are located in the U-shaped groove of the unidirectional fabric;

[0065] Fig.15 Schematic diagram of the auxiliary support body with the internal expansion core mold filled inside;

[0066] Fig.16 Schematic diagram of the state of auxiliary support body 1 being laid in auxiliary support body 1 placement area B and auxiliary support body 2 being laid in auxiliary support body 2 placement area B;

[0067] Fig.17 Schematic diagram of the inner expansion core mold being laid in the inner cavity of the auxiliary support body 1 and the auxiliary support body 2;

[0068] Fig.18 A schematic diagram of the structure of the upper half mold 1 of the mold 1 of the present invention;

[0069] Fig.19 A schematic diagram of the structure of the upper half mold 2 of the mold 2 of the present invention;

[0070] Fig. 20 Schematic diagram of the auxiliary support body wrapped in a lightweight support material and a unidirectional fabric;

[0071] Fig.21 Schematic diagram of auxiliary support body 1, auxiliary support body 2, unidirectional fabric and lightweight support material layer laid in lower concave cavity 1 of the mold;

[0072] Fig. 22 Schematic diagram of the state where auxiliary support body 1, auxiliary support body 2, unidirectional fabric and lightweight support material are laid in lower concave cavity 1;

[0073] Fig.23 Schematic diagram of the state in which the metal petiole and the main support body layer are laid in the main support body placement area A and the metal petiole is positioned in the lower positioning groove 1;

[0074] In the figure: 1, metal petiole; 2, grating blade; 21, support frame; 211, main support body; 212, auxiliary support body 1; 213, auxiliary support body 2; 22, skin layer; 221, working surface skin; 222, non-working surface skin; 3, unidirectional cloth; 4, mold 1; 41, upper half mold 1; 411, upper concave cavity 1; 412, upper positioning groove 1; 42, lower half mold 1; 421, lower concave cavity 1; 422, lower positioning groove 1; 43, main support body placement area A; 44, auxiliary Support body one placement area A; 45, auxiliary support body two placement area A; 5, mold two; 51, upper half mold two; 511, upper concave cavity two; 512, upper positioning groove two; 52, lower half mold two; 521, lower concave cavity two; 522, lower positioning groove two; 53, main support body placement area B; 54, auxiliary support body one placement area B; 55, auxiliary support body two placement area B; 6, internal expansion core mold; 61, internal expansion core mold one; 62, internal expansion core mold two; 63, internal expansion core mold three; 7, lightweight support material. DETAILED DESCRIPTION

[0075] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0076] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0077] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0078] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0079] Figures 1 to 7 The blade structure is shown; Figures 8 to 23 As shown, a blade cascade structure forming mold, the blade cascade structure includes a metal blade stalk 1 and a blade 2, the blade 2 includes a support frame 21 coaxially sleeved on one end of the metal blade stalk 1 and a skin layer 22 wrapped around the outer surface of the support frame 21; including:

[0080] The mold 4 comprises an upper mold 41 and a lower mold 42; the upper mold 41 is provided with an upper cavity 411 and an upper positioning groove 412 corresponding to one side of the length direction of the upper cavity 411 and communicating with the upper cavity 411 on the bottom surface of the upper mold 41; the lower mold 42 is provided with a lower cavity 421 and a lower positioning groove 422 corresponding to one side of the length direction of the lower cavity 421 and communicating with the lower cavity 421 on the top surface of the lower mold 42;

[0081] The upper half mold 41 and the lower half mold 42 can be adapted to form a matching mold so that the upper concave cavity 411 and the lower concave cavity 421 together enclose a blade cavity 1 that is adapted to the outer contour shape and size of the skin layer 22, and the upper positioning groove 412 and the lower positioning groove 422 together enclose a petiole positioning hole 1 that can adapt to position the outer peripheral wall of the other end of the metal petiole 1.

[0082] When the blade structure forming mold of this embodiment is used, the lower concave cavity 421 of the lower half mold 42 is used to arrange and position the blade 2, and the lower positioning groove 422 of the lower half mold 42 is used to install and position the metal petiole 1, which can improve the accuracy of assembly and positioning; when the mold is closed and pressed, the metal petiole 1 is further accurately positioned through the petiole positioning hole formed by the upper positioning groove 412 and the lower positioning groove 422, and the shape and size accuracy of the blade 2 is further ensured through the blade cavity, thereby achieving high-precision assembly and pressing of the metal petiole 1 and the blade 2.

[0083] In some embodiments, the support skeleton 21 includes a main support body 211 arranged along the length direction of the metal petiole 1 (i.e., the direction of the blade axis) and wrapped around one end of the metal petiole 1, and auxiliary support bodies 1 212 and auxiliary support bodies 2 213 arranged one by one on both sides of the width direction of the main support body 211 (i.e., the direction of the blade chord); there are multiple auxiliary support bodies 1 212 and auxiliary support bodies 2 213, and multiple auxiliary support bodies 1 212 and multiple auxiliary support bodies 2 213 are arranged in sequence along the length direction of the main support body 211. In order to solve the connection problem between the auxiliary support body 1 212, the auxiliary support body 2 213 and the main support body 211, the auxiliary support body 1 212 and the auxiliary support body 2 213 are wrapped around the main support body 211 by a unidirectional cloth 3 to achieve a stable connection, which has higher strength than gluing. The auxiliary support body 1 212, the auxiliary support body 2 213 and the main support body 211 are firmly connected to form a support skeleton structure;

[0084] The inner surface of the grating blade cavity is a profile of a layered skin layer 22; one end of the grating blade cavity corresponding to the petiole positioning hole is a main support body placement area A43 for fitting the main support body 211; one side of the grating blade cavity corresponding to the main support body placement area A43 is an auxiliary support body one placement area A44 for fitting multiple auxiliary support bodies one 212; the other side of the grating blade cavity corresponding to the main support body placement area A43 is an auxiliary support body two placement area A45 for fitting multiple auxiliary support bodies two 213.

[0085] The inner surface of the cascade blade cavity 1 can ensure the curing and shaping accuracy of the skin layer 22 , thereby ensuring the surface profile accuracy of the cascade blade 2 .

[0086] In some embodiments, in order to solve the problem of forming the cascade structure with multiple closed cavity structures, a second mold 5 for preforming the cascade structure is also included, and the second mold 5 includes an upper half mold 51 and a lower half mold 52; the bottom surface of the upper half mold 51 is provided with an upper cavity 511 and an upper positioning groove 512 corresponding to one side of the upper cavity 511 in the length direction and connected to the upper cavity 511, and the top surface of the lower half mold 52 is provided with a lower cavity 521 and a lower positioning groove 522 corresponding to one side of the lower cavity 521 in the length direction and connected to the lower cavity 521;

[0087] The upper half mold 2 51 and the lower half mold 2 52 can be adapted to form a matching mold so that the upper concave cavity 2 and the lower concave cavity 2 521 together enclose a grating blade cavity 2 which has the same shape as the outer contour of the grating blade 2 and is used to prepare a preformed grating blade, and the upper positioning groove 2 512 and the lower positioning groove 2 522 together enclose a petiole positioning hole 2 which can be adapted to position the outer peripheral wall of the other end of the metal petiole 1; the size of the grating blade cavity 2 is smaller than that of the grating blade cavity 1, so as to provide reserved space for the reserved skin that is laid in the mold 1 4 and wrapped around the outer surface of the preformed grating blade.

[0088] When in use, several layers of whole skin (working surface skin 221 and non-working surface skin 222 are integrally connected) are reserved for secondary curing and molding using mold 1 4; the remaining skin is divided into two parts, working surface skin 221 and non-working surface skin 222, and the working surface skin 221 is cured and molded separately by autoclave or vacuum process and then reserved. Mold 2 5 can be used to prepare preformed cascade blades fixedly connected with metal petioles 1. The outer dimensions of the prepared preformed cascade blades are smaller than the outer dimensions of the final cascade structure. The prepared preformed cascade blades can be used as components of the secondary processed cascade structure and filled into mold 1 4 for secondary wrapping of the reserved whole skin layer 22, thereby realizing the molding and manufacturing of multiple closed cavity structures and improving the structural strength and molding accuracy of the cascade structure.

[0089] In some embodiments, the inner surface of the second grating blade cavity is the second profile of the layered skin layer 22; one end of the second grating blade cavity corresponding to the second petiole positioning hole is the main support body placement area B53 adapted to place the main support body 211; one side of the second grating blade cavity corresponding to the main support body placement area B53 is the auxiliary support body one placement area B54 adapted to lay multiple auxiliary support bodies one 212; the other side of the second grating blade cavity corresponding to the main support body placement area B53 is the auxiliary support body two placement area B55 adapted to lay multiple auxiliary support bodies two 213.

[0090] In some embodiments, it also includes multiple groups of internal expansion core molds 6; the auxiliary support body 1 212 and the auxiliary support body 2 213 are both U-shaped; the U-shaped grooves of the auxiliary support body 1 212 and the auxiliary support body 2 213 can be removably adapted to be filled with corresponding internal expansion core molds 6, so as to support the corresponding auxiliary support body 1 212, the auxiliary support body 2 213 and the skin layer 22 through the internal expansion core molds 6 during molding.

[0091] The internal expansion core mold 6 filled in the inner cavity of the auxiliary support body 1 212 and the auxiliary support body 2 213 can play a supporting role and provide internal pressure during the molding process to improve the molding accuracy and molding quality of the blade skin layer; the internal expansion core mold 6 is a detachable structure, and the non-working surface skin 222 and the metal petiole 1, the support frame 21 and the internal expansion core mold 6 are integrally solidified and molded to form a preformed blade connected to the metal petiole 1. The preformed blade has an opening in the direction of the working surface skin 221, and the internal expansion core mold 6 can be taken out from the U-shaped groove of the auxiliary support body 1 212 and the auxiliary support body 2 213 after the preformed blade is formed, so as to finally obtain a blade structure with a cavity structure.

[0092] In some embodiments, the two opposite side walls in the U-shaped groove of the auxiliary support body 1 212 and the auxiliary support body 2 213 both have grooves; each group of internal expansion core molds 6 includes internal expansion core mold 1 61, internal expansion core mold 2 62 and internal expansion core mold 3 63; the grooves on the two opposite side walls in the U-shaped groove of the auxiliary support body 1 212 and the auxiliary support body 2 213 are detachably adapted to fill the corresponding internal expansion core mold 1 61 and internal expansion core mold 3 63, and the internal expansion core mold 2 62 is detachably adapted to fill the U-shaped groove of the auxiliary support body 1 212 and the auxiliary support body 2 213, and corresponds to the corresponding internal expansion core mold 1 61 and internal expansion core mold 3 63.

[0093] The inner expansion core mold 1 61 and the inner expansion core mold 3 63 are filled in the grooves of the U-shaped groove side walls of the auxiliary support body 1 212 and the auxiliary support body 2 213, which further improves the supporting strength; when taking out, the inner expansion core mold 2 62 located between the inner expansion core mold 1 61 and the inner expansion core mold 3 63 can be taken out directly first, and then the inner expansion core mold 1 61 and the inner expansion core mold 3 63 can be taken out separately.

[0094] Another aspect of the present invention provides a blade cascade structure forming method, comprising a blade cascade structure forming mold, wherein the forming steps are:

[0095] S1: Prepare a cascade structure using a mold 4; the molding material is prepreg; the two opposite sides of the cascade blade 2 are respectively a working surface and a non-working surface; the skin layer 22 includes a non-working surface skin 222 and a working surface skin 221 integrally connected to the non-working surface skin; the non-working surface skin 222 is laid on the inner surface of the lower positioning groove 422 of the lower half mold 42, and vacuumed and compacted to form the non-working surface of the cascade blade 2;

[0096] S2: Fill the inner cavity of the support frame 21 with compressible lightweight support material 7; coaxially sleeve the support frame 21 on one end of the metal petiole 1; place the other end of the metal petiole 1 in the lower positioning groove 422 for positioning, and lay the supporting frame 21 adaptation layer on the non-working surface skin 222 in the lower concave cavity 421; fold the working surface skin 221 and lay it on the support frame 21 and the lightweight support material 7 to form the working surface of the cascade blade 2;

[0097] S3: Fit the upper mold 41 onto the lower mold 42 to position the other end of the metal petiole 1 in the petiole positioning hole 1, and fit the upper concave cavity 411 of the upper mold 41 onto the working surface skin 221 to seal the grating to be formed in the grating cavity 1, and control the external dimensions of the lightweight supporting material 7 to control the amount of compression, close the mold, heat and solidify it, and press it into a grating structure.

[0098] In some embodiments, S2 specifically includes the following steps:

[0099] S21: The inner bottom surface of the U-shaped groove of each auxiliary support body 1 212 and the auxiliary support body 2 213 is fitted with the wrapped unidirectional cloth 3, and both ends of each unidirectional cloth 3 extend to the outside of the U-shaped cavity of the corresponding auxiliary support body 1 212 or the auxiliary support body 2 213 to form a working surface connection end and a non-working surface connection end, and the U-shaped groove of each auxiliary support body 1 212 and the auxiliary support body 2 213 is filled with compressible lightweight support material 7, and after the unidirectional cloth 3 wrapping and the lightweight support material 7 filling work is completed, the unidirectional cloth 3 is evacuated for standby use;

[0100] S22: laying a plurality of auxiliary support bodies 1 212 in sequence in the auxiliary support body 1 placement area A44, laying a plurality of auxiliary support bodies 213 in sequence in the auxiliary support body 2 placement area A45, and making the non-working surface connection end of the unidirectional cloth 3 wrapping the auxiliary support body 1 212 and the non-working surface connection end of the unidirectional cloth 3 wrapping the corresponding auxiliary support body 2 213 butt joint with each other (the butt joint positions of each unidirectional cloth 3 need to be staggered) and laying them on the non-working surface skin 222;

[0101] S23: The main support body 211 is coaxially sleeved on one end of the metal petiole 1; the other end of the metal petiole 1 is correspondingly placed in the lower positioning groove 422 for positioning, and the main support body 211 is adapted to be placed in the main support body placement area A43 and laid on the non-working surface skin 222 and the unidirectional cloth 3 corresponding to the non-working surface; after the layering is completed, the whole is vacuumed;

[0102] S24: The working surface connection end of the unidirectional cloth 3 wrapping the auxiliary support body 1 212 and the working surface connection end of the unidirectional cloth 3 wrapping the corresponding auxiliary support body 2 213 are butted together (the butt joint positions of each unidirectional cloth 3 need to be staggered) and layered on the main support body 211; the working surface skin 221 is folded and covered on the support frame 21, the auxiliary support body 1 212, the auxiliary support body 213, the lightweight support material 7 and the unidirectional cloth 3.

[0103] Another aspect of the present invention provides a blade cascade structure forming method, comprising a blade cascade structure forming mold, wherein the forming steps are:

[0104] S10: using the mold 2 5 to prepare a preformed grating blade; the molding material is prepreg; the two opposite sides of the grating blade 2 are respectively the working surface and the non-working surface; the skin layer 22 includes the non-working surface skin 222, the working surface skin 221 and the reserved skin; the working surface skin 221 is cured and formed separately by an autoclave or a vacuum process method and is then used; the non-working surface skin 222 is laid on the inner surface of the lower concave cavity 2 521 of the lower half mold 2 52, and vacuumed and compacted;

[0105] S20: The unidirectional cloth 3 is fitted and wrapped on the bottom surface of the U-shaped groove of the auxiliary support body 1 212 and the auxiliary support body 2 213, and both ends of each unidirectional cloth 3 extend to the outside of the U-shaped cavity of the corresponding auxiliary support body 1 212 or the auxiliary support body 2 213 to form a working surface connection end and a non-working surface connection end, and the U-shaped groove of the auxiliary support body 1 212 and the auxiliary support body 2 213 is filled with an internal expansion core mold 6; after the unidirectional cloth 3 wrapping and the internal expansion core mold 6 filling work are completed, the evacuation is carried out for standby use;

[0106] S30: laying a plurality of auxiliary support bodies 1 212 in sequence in the auxiliary support body 1 placement area B54, laying a plurality of auxiliary support bodies 213 in sequence in the auxiliary support body 2 placement area B55, and making the non-working surface connection end of the unidirectional cloth 3 wrapping the auxiliary support body 1 212 and the non-working surface connection end of the unidirectional cloth 3 wrapping the corresponding auxiliary support body 2 213 butt joint with each other (the butt joint positions of each unidirectional cloth 3 need to be staggered) and laying them on the non-working surface skin 222;

[0107] S40: The main support body 211 is coaxially sleeved and fixed on one end of the metal petiole 1; the other end of the metal petiole 1 is correspondingly placed in the lower positioning groove 522 for positioning, and the main support body 211 is adapted to be placed in the main support body placement area B53 and laid on the non-working surface skin 222 and the non-working surface connection end of the unidirectional fabric 3; after the layering is completed, the whole is vacuumed;

[0108] S50: butt the working surface connection end of the unidirectional cloth 3 wrapped around the auxiliary support body 1 212 and the working surface connection end of the unidirectional cloth 3 wrapped around the corresponding auxiliary support body 213 (the butt joint positions of each unidirectional cloth 3 need to be staggered) and lay them on the main support body 211; close the upper half mold 51 and the lower half mold 52, heat and cure them to form a cured assembly;

[0109] S60: after curing, the inner expansion core mold 6 is taken out, and the cured working surface skin 221 is bonded to the cured assembly in step S50 to form a preformed cascade blade fixedly connected with the metal blade handle 1;

[0110] S70: Use mold 4 to make a blade structure; lay the non-working surface of the reserved skin on the inner surface of the lower concave cavity 421 of the lower half mold 42, vacuum compaction is performed, the preformed blade is fitted into the lower concave cavity 421 and the metal petiole 1 is fitted into the lower positioning groove 422, the working surface of the reserved skin is laid on the surface of the preformed blade, the upper half mold 41 and the lower half mold 42 are molded together, and heating and curing are performed to form the blade structure.

[0111] Another aspect of the present invention provides a blade cascade structure forming method, comprising a blade cascade structure forming mold, wherein the forming steps are:

[0112] S100: Preparing a preformed grating blade by using the second mold 5; the molding material is prepreg; the two opposite sides of the grating blade 2 are respectively the working surface and the non-working surface; the skin layer 22 includes the non-working surface skin 222, the working surface skin 221 and the reserved skin; the working surface skin 221 is cured and molded separately by an autoclave or a vacuum process method and is then used for standby; the non-working surface skin 222 is laid on the inner surface of the lower concave cavity 2 521 of the second lower mold half 52, and vacuumed and compacted;

[0113] S200: Lay the unidirectional fabric 3 on the non-working surface skin 222 corresponding to the lower positioning groove 2 522, the unidirectional fabric 3 is arranged in a U shape with the U-shaped opening facing upward, so as to define a main support body placement area B53 in the U-shaped groove corresponding to the unidirectional fabric 3 in the lower concave cavity 2 521;

[0114] S300: The main support body 211 is coaxially sleeved and fixed on one end of the metal petiole 1; the other end of the metal petiole 1 is correspondingly placed in the lower positioning groove 522 for positioning, and the main support body 211 is adapted to be placed in the main support body placement area B53 and laid on the non-working surface skin 222 and the bottom surface of the U-shaped groove of the one-way fabric 3; after the layering is completed, the whole is vacuumed;

[0115] S400: Wrap the auxiliary support body 1 212 and the auxiliary support body 2 213 on the corresponding internal expansion core mold 6 and evacuate them for standby; remove the auxiliary support body 1 212 and the auxiliary support body 2 213 from the internal expansion core mold 6; sequentially lay a plurality of auxiliary support bodies 1 212 in the auxiliary support body 1 placement area B54, and sequentially lay a plurality of auxiliary support bodies 2 213 in the auxiliary support body 2 placement area B55, and assemble them with the corresponding unidirectional fabric 3, and fill the internal expansion core mold 6 into the U-shaped groove of the corresponding auxiliary support body 1 212 and the auxiliary support body 2 213;

[0116] S500: butt the working surface connection end of the unidirectional cloth 3 wrapped around the auxiliary support body 1 212 and the working surface connection end of the unidirectional cloth 3 wrapped around the corresponding auxiliary support body 213 (the butt joint positions of each unidirectional cloth 3 need to be staggered) and lay them on the main support body 211; close the upper half mold 51 and the lower half mold 52, heat and cure them to form a cured assembly;

[0117] S600: after curing, the inner expansion core mold 6 is taken out, and the cured working surface skin 221 is bonded to the cured assembly in step S50 to form a preformed cascade blade fixedly connected with the metal blade handle 1;

[0118] S700: Use mold 4 to make a blade cascade structure; lay the non-working surface of the reserved skin on the inner surface of the lower concave cavity 421 of the lower half mold 42, vacuum compaction is performed, the preformed cascade blade is fitted into the lower concave cavity 421 and the metal petiole 1 is fitted into the lower positioning groove 422, the working surface of the reserved skin is laid on the surface of the preformed cascade blade, the upper half mold 41 and the lower half mold 42 are molded together, and heating and curing are performed to form a blade cascade structure.

[0119] It should be noted that the purpose of vacuuming and vacuum compaction is to reduce the difference in material size caused by the thickness of the layered prepreg being greater than the theoretical size after molding, improve the smoothness of subsequent assembly of various components, and thus improve the molding quality.

[0120] It should be noted that during the actual molding process, the external dimensions of the auxiliary support body 1 212 and the auxiliary support body 2 213 can be slightly smaller than the actual design dimensions, so as to avoid the problem of being unable to be assembled into the mold due to the large dimensions in the subsequent operation process.

[0121] It should be noted that: the shape and size of the profile one of the cascade blade cavity one of mold one are consistent with the shape and size of the cascade blade of the cascade structure; the shape of the profile two of the cascade blade cavity two of mold two is the same as the outer contour shape of the cascade blade of the cascade structure, but the size of the profile two of the cascade blade cavity two of mold two is smaller than the outer size of the cascade blade of the cascade structure, and the thickness removed from the cascade blade cavity two compared with the cascade blade cavity one is consistent with the reserved skin thickness; when in use, first use mold two smaller than the outer size of the cascade for primary molding, and then use mold one consistent with the outer shape of the cascade for secondary molding.

[0122] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0123] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A blade cascade structure forming die, the blade cascade structure comprising a metal blade handle (1) and a blade (2), the blade (2) comprising a support frame (21) coaxially sleeved on one end of the metal blade handle (1) and a skin layer (22) wrapped around the outer surface of the support frame (21); characterized in that: include: A mold (4), wherein the mold (4) comprises an upper mold (41) and a lower mold (42); the upper mold (41) has an upper cavity (411) and an upper positioning groove (412) corresponding to one side of the length direction of the upper cavity (411) and connected to the upper cavity (411) on its bottom surface, and the lower mold (42) has a lower cavity (421) and a lower positioning groove (422) corresponding to one side of the length direction of the lower cavity (421) and connected to the lower cavity (421) on its top surface; The upper half mold (41) and the lower half mold (42) can be adapted to form a matching mold so that the upper concave cavity (411) and the lower concave cavity (421) together enclose a grating blade cavity that is adapted to the outer contour shape and size of the skin layer (22), and the upper positioning groove (412) and the lower positioning groove (422) together enclose a petiole positioning hole that can be adapted to position the outer peripheral wall of the other end of the metal petiole (1).

2. A blade cascade structure forming mold according to claim 1, characterized in that: The support frame (21) comprises a main support body (211) arranged along the length direction of the metal petiole (1) and wrapped around one end of the metal petiole (1), and an auxiliary support body 1 (212) and an auxiliary support body 2 (213) arranged one by one on both sides of the width direction of the main support body (211); the auxiliary support body 1 (212) and the auxiliary support body 2 (213) are both multiple, and the multiple auxiliary support bodies 1 (212) and the multiple auxiliary support bodies 2 (213) are all arranged in sequence along the length direction of the main support body (211), and are all connected to the main support body (211) by winding with a unidirectional cloth (3), so as to jointly constitute a support frame structure; The inner surface of the grating blade cavity 1 is a profile 1 for laying the skin layer (22); one end of the grating blade cavity 1 corresponding to the petiole positioning hole 1 is a main support body placement area A (43) adapted to place the main support body (211); one side of the grating blade cavity 1 corresponding to the main support body placement area A (43) is an auxiliary support body one placement area A (44) adapted to lay multiple auxiliary support bodies one (212) in layers; the other side of the grating blade cavity 1 corresponding to the main support body placement area A (43) is an auxiliary support body two placement area A (45) adapted to lay multiple auxiliary support bodies two (213) in layers.

3. A blade cascade structure forming mold according to claim 2, characterized in that: It also includes a second mold (5) for preforming the cascade structure, the second mold (5) including an upper mold half (51) and a lower mold half (52); the bottom surface of the second upper mold half (51) is provided with an upper cavity (511) and an upper positioning groove (512) corresponding to one side of the second upper cavity (511) in the length direction and communicating with the second upper cavity (511); the top surface of the second lower mold half (52) is provided with a lower cavity (521) and a lower positioning groove (522) corresponding to one side of the second lower cavity (521) in the length direction and communicating with the second lower cavity (521); The upper half mold 2 (51) and the lower half mold 2 (52) can be adapted to form a matching mold so that the upper concave cavity 2 and the lower concave cavity 2 (521) together enclose a blade cavity 2 which has the same shape as the outer contour of the blade (2) and is used to prepare a preformed blade, and the upper positioning groove 2 (512) and the lower positioning groove 2 (522) together enclose a petiole positioning hole 2 which can be adapted to position the outer peripheral wall of the other end of the metal petiole (1); the size of the blade cavity 2 is smaller than the size of the blade cavity 1, so as to provide a reserved space for a reserved skin which is laid in the mold 1 (4) and wrapped around the outer surface of the preformed blade.

4. The blade cascade structure forming mold according to claim 3, characterized in that: The inner surface of the second grating blade cavity is a second shaped surface for laying the skin layer (22); one end of the second grating blade cavity corresponding to the second petiole positioning hole is a main support body placement area B (53) adapted to place the main support body (211); one side of the second grating blade cavity corresponding to the main support body placement area B (53) is an auxiliary support body one placement area B (54) adapted to lay multiple auxiliary support bodies one (212) in layers; the other side of the second grating blade cavity corresponding to the main support body placement area B (53) is an auxiliary support body two placement area B (55) adapted to lay multiple auxiliary support bodies two (213) in layers.

5. A blade cascade structure forming die according to claim 4, characterized in that: It also includes a plurality of sets of internal expansion core molds (6); the auxiliary support body 1 (212) and the auxiliary support body 2 (213) are both U-shaped; the U-shaped grooves of the auxiliary support body 1 (212) and the auxiliary support body 2 (213) can be removably adapted to be filled with the corresponding internal expansion core molds (6), so that the corresponding auxiliary support body 1 (212), the auxiliary support body 2 (213) and the skin layer (22) can be supported by the internal expansion core molds (6) during molding.

6. A blade cascade structure forming die according to claim 5, characterized in that: The two opposite side walls in the U-shaped groove of the auxiliary support body 1 (212) and the auxiliary support body 2 (213) are provided with grooves; each group of the internal expansion core molds (6) includes the internal expansion core mold 1 (61), the internal expansion core mold 2 (62) and the internal expansion core mold 3 (63); the grooves on the two opposite side walls in the U-shaped groove of the auxiliary support body 1 (212) and the auxiliary support body 2 (213) are respectively and removably adapted to be filled with the corresponding internal expansion core mold 1 (61) and the internal expansion core mold 3 (63); the internal expansion core mold 2 (62) is removably adapted to be filled in the U-shaped groove of the auxiliary support body 1 (212) and the auxiliary support body 2 (213), and is located between the corresponding internal expansion core mold 1 (61) and the internal expansion core mold 3 (63).

7. A method for forming a cascade structure, characterized in that: A blade cascade structure forming mold comprising any one of claims 1 to 2, wherein the forming steps are: S1: using a mold (4) to prepare a cascade structure; the molding material is prepreg; the skin layer (22) includes a non-working surface skin and a working surface skin integrally connected to the non-working surface skin; the non-working surface skin is laid on the inner surface layer of the lower positioning groove (422) of the lower half mold (42), and vacuumed and compacted to form the non-working surface of the cascade blade (2); S2: Filling the inner cavity of the support frame (21) with a compressible lightweight support material; coaxially sleeve-fastening the support frame (21) on one end of the metal petiole (1); placing the other end of the metal petiole (1) in the lower positioning groove (422) for positioning, and laying the supporting frame (21) adaptation layer on the non-working surface skin in the lower concave cavity (421); folding the working surface skin and laying it on the support frame (21) and the lightweight support material to form the working surface of the grating blade (2); S3: The upper mold (41) is fitted onto the lower mold (42) to position the other end of the metal petiole (1) in the petiole positioning hole, and the upper concave cavity (411) of the upper mold (41) is fitted onto the working surface skin to seal the cascade blade to be formed in the cascade blade cavity. The compression amount is controlled by controlling the outer dimensions of the lightweight support material, and the mold is closed, heated, and solidified to form a cascade structure.

8. A cascade structure forming method according to claim 7, characterized in that: S2 specifically includes the following steps: S21: The inner bottom surface of the U-shaped groove of each auxiliary support body 1 (212) and the auxiliary support body 2 (213) is fitted with a one-way cloth (3) for wrapping, and both ends of each one-way cloth (3) extend to the outside of the U-shaped cavity of the corresponding auxiliary support body 1 (212) or the auxiliary support body 2 (213) to form a working surface connection end and a non-working surface connection end, and a compressible light support material is filled in the U-shaped groove of each auxiliary support body 1 (212) and the auxiliary support body 2 (213), and after the one-way cloth (3) wrapping and the light support material filling work are completed, the one-way cloth (3) is evacuated for standby use; S22: laying a plurality of auxiliary support bodies 1 (212) in sequence in the auxiliary support body 1 placement area A (44), laying a plurality of auxiliary support bodies 2 (213) in sequence in the auxiliary support body 2 placement area A (45), and making the non-working surface connection end of the one-way cloth (3) wrapping the auxiliary support body 1 (212) and the non-working surface connection end of the one-way cloth (3) wrapping the corresponding auxiliary support body 2 (213) butt joint with each other and lay them layered on the non-working surface skin; S23: The main support body (211) is coaxially sleeved and fixed on one end of the metal petiole (1); the other end of the metal petiole (1) is correspondingly placed in the lower positioning groove 1 (422) for positioning, and the main support body (211) is adapted to be placed in the main support body placement area A (43) and laid on the non-working surface skin and the unidirectional cloth (3) corresponding to the non-working surface; after the layering is completed, the whole is vacuumed; S24: The working surface connection end of the one-way cloth (3) wrapping the auxiliary support body one (212) and the working surface connection end of the one-way cloth (3) wrapping the corresponding auxiliary support body two (213) are butted together and laid on the main support body (211); the working surface skin is folded and covered on the support frame (21), the auxiliary support body one (212), the auxiliary support body two (213), the lightweight support material and the one-way cloth (3).

9. A method for forming a cascade structure, characterized in that: A blade cascade structure forming mold comprising any one of claims 3 to 6, wherein the forming steps are: S10: using the second mold (5) to prepare a preformed grating blade; the molding material is prepreg; the skin layer (22) includes a non-working surface skin, a working surface skin and a reserved skin; the working surface skin is cured and molded separately by an autoclave or a vacuum process method and is then used; the non-working surface skin is laid on the inner surface layer of the lower concave cavity (521) of the second lower mold (52), and vacuumed and compacted; S20: The unidirectional cloth (3) is wrapped on the bottom surface of the U-shaped groove of the auxiliary support body 1 (212) and the auxiliary support body 2 (213), and both ends of each unidirectional cloth (3) extend to the outside of the U-shaped cavity of the corresponding auxiliary support body 1 (212) or the auxiliary support body 2 (213) to form a working surface connection end and a non-working surface connection end, and the U-shaped groove of the auxiliary support body 1 (212) and the auxiliary support body 2 (213) is filled with an internal expansion core mold (6); after the unidirectional cloth (3) wrapping and the internal expansion core mold (6) filling work are completed, vacuum is evacuated for standby use; S30: laying a plurality of auxiliary support bodies 1 (212) in sequence in the auxiliary support body 1 placement area B (54), laying a plurality of auxiliary support bodies 2 (213) in sequence in the auxiliary support body 2 placement area B (55), and making the non-working surface connection end of the unidirectional cloth (3) wrapping the auxiliary support body 1 (212) and the non-working surface connection end of the unidirectional cloth (3) wrapping the corresponding auxiliary support body 2 (213) butt joint with each other and lay them layer by layer on the non-working surface skin; S40: The main support body (211) is coaxially sleeved and fixed on one end of the metal petiole (1); the other end of the metal petiole (1) is correspondingly placed in the lower positioning groove 2 (522) for positioning, and the main support body (211) is adapted to be placed in the main support body placement area B (53) and laid on the non-working surface skin and the non-working surface connection end of the one-way cloth (3); after the layering is completed, the whole is vacuumed; S50: the working surface connection end of the one-way cloth (3) wrapping the auxiliary support body 1 (212) and the working surface connection end of the one-way cloth (3) wrapping the corresponding auxiliary support body 2 (213) are butted against each other and laid on the main support body (211); the upper half mold 2 (51) and the lower half mold 2 (52) are molded together, and heated and cured to form a cured assembly; S60: after solidification, the inner expansion core mold (6) is taken out, and the solidified working surface skin is bonded to the solidified assembly in step S50 to form a preformed cascade blade fixedly connected with the metal blade handle (1); S70: Using mold one (4) to make a blade cascade structure; laying the non-working surface of the reserved skin on the inner surface of the lower concave cavity one (421) of the lower half mold one (42), vacuuming and compacting, fitting the manufactured preformed blade into the lower concave cavity one (421) and fitting the metal petiole (1) into the lower positioning groove one (422), laying the working surface of the reserved skin on the surface of the manufactured preformed blade, closing the upper half mold one (41) and the lower half mold one (42), heating and curing to form the blade cascade structure.

10. A method for forming a cascade structure, characterized in that: A blade cascade structure forming mold comprising any one of claims 3 to 6, wherein the forming steps are: S100: using mold 2 (5) to prepare a preformed grating blade; the molding material is prepreg; the skin layer (22) includes a non-working surface skin, a working surface skin and a reserved skin; the working surface skin is cured and molded separately by an autoclave or a vacuum process method and is then used for standby; the non-working surface skin is laid on the inner surface layer of the lower concave cavity 2 (521) of the lower half mold 2 (52), and vacuumed and compacted; S200: Laying a unidirectional fabric (3) on the non-working surface skin corresponding to the lower positioning groove 2 (522), the unidirectional fabric (3) being arranged in a U-shape with the U-shaped opening facing upwards, so as to define a main support body placement area B (53) in the U-shaped groove corresponding to the unidirectional fabric (3) in the lower concave cavity 2 (521); S300: The main support body (211) is coaxially sleeved and fixed on one end of the metal petiole (1); the other end of the metal petiole (1) is correspondingly placed in the lower positioning groove 2 (522) for positioning, and the main support body (211) is adapted to be placed in the main support body placement area B (53) and laid on the non-working surface skin and the bottom surface of the U-shaped groove of the one-way cloth (3); after the layering is completed, the whole is vacuumed; S400: Wrap the auxiliary support body 1 (212) and the auxiliary support body 2 (213) on the corresponding internal expansion core mold (6) and evacuate them for standby; remove the auxiliary support body 1 (212) and the auxiliary support body 2 (213) from the internal expansion core mold (6); sequentially lay a plurality of auxiliary support bodies 1 (212) in the auxiliary support body 1 placement area B (54), and sequentially lay a plurality of auxiliary support bodies 2 (213) in the auxiliary support body 2 placement area B (55), and assemble them with the corresponding unidirectional fabric (3), and fill the internal expansion core mold (6) into the U-shaped groove of the corresponding auxiliary support body 1 (212) and the auxiliary support body 2 (213); S500: the working surface connection end of the one-way cloth (3) wrapping the auxiliary support body 1 (212) and the working surface connection end of the one-way cloth (3) wrapping the corresponding auxiliary support body 2 (213) are butted against each other and laid on the main support body (211); the upper half mold 2 (51) and the lower half mold 2 (52) are molded together, and heated and cured to form a cured assembly; S600: after curing, the inner expansion core mold (6) is taken out, and the cured working surface skin is bonded to the cured assembly in step S50 to form a preformed cascade blade fixedly connected with the metal blade handle (1); S700: Use mold one (4) to make a blade cascade structure; lay the non-working surface of the reserved skin on the inner surface of the lower concave cavity one (421) of the lower half mold one (42), vacuum compaction is performed, the manufactured preformed blade is fitted into the lower concave cavity one (421) and the metal petiole (1) is fitted into the lower positioning groove one (422), the working surface of the reserved skin is laid on the surface of the manufactured preformed blade, the upper half mold one (41) and the lower half mold one (42) are molded together, and heating and curing are performed to form the blade cascade structure.

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