Hollow guide blade forming integral pressing device and method

Abstract

The present invention relates to a hollow guide blade integral molding and pressing device and method, the device comprising a leading edge molding unit, a blade back molding unit, a blade basin molding unit, and a core mold; the leading edge molding unit, the blade back molding unit, and the blade basin molding unit are arranged around the outside of the core mold and are respectively used to mold the leading edge, blade back, and blade basin of the hollow guide blade; the leading edge molding unit comprises a first leading edge molding block, a second leading edge molding block, and a third leading edge molding block arranged in sequence from top to bottom; the blade back molding unit comprises a first blade back molding block, a second blade back molding block, and a third blade back molding block arranged in sequence from top to bottom; and the blade basin molding unit comprises a first blade basin molding block, a second blade basin molding block, and a third blade back basin molding block arranged in sequence from top to bottom. Compared with the prior art, the present invention has the advantages of high molding precision.

Description

Technical Field

[0001] The present invention relates to the technical field of blade molding, and in particular to a hollow guide blade molding integral pressing device and method. Background Art

[0002] Hollow guide vanes (guide vanes) consist of a leading edge, a trailing edge, a basin, and a back face. The leading edge is the front end of the guide vane, the first part contacted by fluid as it flows through it. The basin is the high-pressure side of the guide vane, typically located upstream of the fluid flow. The back face is the low-pressure side of the guide vane, typically located downstream of the fluid flow. Hollow guide vanes can be used as turbine stators in aircraft engines, requiring stringent dimensional accuracy.

[0003] Patent CN116652031A discloses a mold and a stamping method for the stamping of gas turbine static blade guide tubes. The mold can complete the forming of the important surface of the guide tube through one-time positioning, reducing the error problem caused by repeated positioning during the guide tube forming process, and greatly improving the accuracy of the prepared guide tube. The overall contour error is within 0.10mm. However, this mold and method are only suitable for sheet metal processing. With the continuous development of aerospace technology, the requirements for materials are also constantly increasing. At present, hollow guide blades are mostly reinforced with high-performance ceramic materials such as silicon carbide fibers, impregnated with high-temperature resistant resins and then cured. If this mold and method are used for forming, problems such as material clamping at the leading edge and wrinkles on the blade basin surface are likely to occur.

[0004] Existing resin-ceramic composite guide vanes are often molded using a split-piece method, where the guide vane's flow path surface is divided into two end structures, upper and lower, and a middle structure. These structures are then pressed and bonded together. However, this method has several drawbacks. First, it compromises the integrity of the product structure, significantly impacting key performance indicators such as strength. Second, the two irregular interfaces formed by the characteristics of the product material make docking difficult, requiring special processing and increasing both process steps and manufacturing costs. Third, these products typically operate at high temperatures, and the interface connection strength has a specified value, which existing bonding technologies fail to fully meet.

[0005] Patent CN105128353A discloses a mold and trailing edge cladding method for integrally cured composite stator blades. This method achieves trailing edge cladding and integral curing of all layers, enhancing blade integrity and preventing high-temperature damage. However, its molding accuracy is low and it is difficult to apply to the molding of hollow guide vanes. Summary of the Invention

[0006] The purpose of the present invention is to provide a hollow guide vane forming integral pressing device and method, which can form high-precision hollow guide vanes.

[0007] The object of the present invention can be achieved by the following technical solutions: a hollow guide vane molding integral pressing device, comprising a leading edge molding unit, a blade back molding unit, a blade basin molding unit and a core mold;

[0008] The leading edge forming unit, the back face forming unit and the blade basin forming unit are arranged around the outside of the core mold and are used to form the leading edge, back face and blade basin of the hollow guide blade respectively;

[0009] The leading edge forming unit comprises a first leading edge forming block, a second leading edge forming block and a third leading edge forming block arranged in sequence from top to bottom;

[0010] The blade back side molding unit includes a first blade back side molding block, a second blade back side molding block and a third blade back side molding block arranged in sequence from top to bottom;

[0011] The blade basin surface forming unit comprises a first blade basin surface forming block, a second blade basin surface forming block and a third blade back basin forming block which are arranged in sequence from top to bottom.

[0012] Preferably, the first leading edge forming block and the second leading edge forming block are positioned via a guide groove, and the second leading edge forming block and the third leading edge forming block are positioned via a guide groove.

[0013] Further preferably, a guide groove is provided at the top of the second leading edge forming block, and a guide block is provided at the bottom, a guide block corresponding to the guide groove at the top of the second leading edge forming block is provided at the bottom of the first leading edge forming block, and a guide groove corresponding to the guide block at the bottom of the second leading edge forming block is provided at the top of the third leading edge forming block.

[0014] Preferably, the first blade back side forming block and the second blade back side forming block are positioned via a guide groove, and the second blade back side forming block and the third blade back side forming block are positioned via a guide groove.

[0015] Further preferably, a guide groove is provided at the top of the second leaf back side forming block, and a guide block is provided at the bottom, a guide block corresponding to the guide groove at the top of the second leaf back side forming block is provided at the bottom of the first leaf back side forming block, and a guide groove corresponding to the guide block at the bottom of the second leaf back side forming block is provided at the top of the third leaf back side forming block.

[0016] Preferably, the first blade basin surface forming block and the second blade basin surface forming block are positioned via a guide groove, and the second blade basin surface forming block and the third blade back basin forming block are positioned via a guide groove.

[0017] Further preferably, a guide groove is provided at the top of the second blade basin surface forming block, and a guide block is provided at the bottom, a guide block corresponding to the guide groove at the top of the second blade basin surface forming block is provided at the bottom of the first blade basin surface forming block, and a guide groove corresponding to the guide block at the bottom of the second blade basin surface forming block is provided at the top of the third blade back basin forming block.

[0018] Preferably, the guide block tolerance of each forming block is 0.003-0.005 mm.

[0019] Preferably, the first leading edge forming block, the second leading edge forming block and the third leading edge forming block are each independently connected to a driving member for driving the movement thereof.

[0020] Preferably, the first blade back side forming block, the second blade back side forming block and the third blade back side forming block are independently connected to a driving member for driving the movement thereof.

[0021] Preferably, the first blade basin surface forming block, the second blade basin surface forming block and the third blade back basin forming block are independently connected to a driving member for driving the movement thereof.

[0022] Preferably, the core mold has the same shape as the hollow flow channel of the hollow guide blade to be formed, is made of high-temperature gasification material, and is gasified at high temperature.

[0023] Further preferably, the material of the core mold includes silicone, fluoride or low melting point alloy.

[0024] More preferably, the material of the core mold includes DOWSIL™ 5166, Krytox™ GPL 460 or NQ™470.

[0025] Further preferably, the gasification temperature of the core mold is higher than room temperature and less than 1000-1100°C.

[0026] Preferably, the parting surface between the leading edge molding unit and the blade basin surface molding unit is located on the blade basin surface curve of the hollow guide blade to be formed, the parting surface between the blade basin surface molding unit and the blade back surface molding unit is located on the blade back surface curve of the hollow guide blade to be formed, and the parting surface between the blade back surface molding unit and the leading edge molding unit is located on the blade back surface curve of the hollow guide blade to be formed.

[0027] Further preferably, the two parting surfaces of the leading edge molding unit are not on the same straight line, and the parting surface between the leading edge molding unit and the blade basin surface molding unit is closer to the intersection of the blade basin surface curve and the blade back surface curve of the hollow guide blade to be formed at the leading edge.

[0028] Further preferably, an overflow area is provided at the parting surface between the blade back surface molding unit and the blade basin surface molding unit.

[0029] More preferably, the overflow area is connected to a vertical overflow trough provided on the outside of the blade back surface forming unit and the blade basin surface forming unit.

[0030] Preferably, the profile tolerance of the molding surface of each molding block close to the core mold side is ±0.01mm.

[0031] Preferably, the vertical overflow trough passes through the blade back surface molding unit and the blade basin surface molding unit from top to bottom.

[0032] Preferably, the hollow guide blade forming integral pressing device further comprises a base and an upper die;

[0033] The base is arranged below the leading edge molding unit, the back blade molding unit and the blade basin molding unit, the upper mold is arranged above the leading edge molding unit, the back blade molding unit and the blade basin molding unit, and the core mold is connected to the upper mold.

[0034] Further preferably, the upper mold includes a first upper mold, a second upper mold and a third upper mold corresponding to the leading edge molding unit, the blade back surface molding unit and the blade basin surface molding unit respectively.

[0035] More preferably, the core mold is connected to the second upper mold.

[0036] Preferably, the second upper mold is provided with a channel for discharging gas generated by gasification of the core mold.

[0037] Further preferably, the channel is connected to the overflow area at the parting surface between the blade back surface molding unit and the blade basin surface molding unit.

[0038] Preferably, the second upper mold is provided with a heating block in the area corresponding to the core mold.

[0039] More preferably, after the first upper mold, the second upper mold and the third upper mold are pressed into place, a gap for forming the upper edge plate of the hollow guide vane is left between the leading edge molding unit, the blade back molding unit and the blade basin molding unit;

[0040] A gap for forming a lower edge plate of the hollow guide blade is reserved between the leading edge forming unit, the blade back surface forming unit, the blade basin surface forming unit and the base.

[0041] Further preferably, the hollow guide blade forming integral pressing device further includes an enclosing frame, which is arranged on the base and can be arranged around the outside of the upper mold.

[0042] More preferably, the enclosing frame has a trapezoidal structure with a single-side cross-section that is small at the top and large at the bottom, the upper mold has a trapezoidal structure with a single-side cross-section that is large at the top and small at the bottom, the leading edge molding unit, the back blade molding unit and the blade basin molding unit have an inclined structure on the outer sides, the inner side of the upper mold is in contact with the leading edge molding unit, the back blade molding unit and the blade basin molding unit, and the outer side is in contact with the enclosing frame.

[0043] In the present invention, a wedge-shaped mechanism is formed between the enclosing frame and the upper mold, and a second wedge-shaped mechanism is formed between the upper mold and the molding unit. Through the two wedge-shaped mechanisms, the downward pressure of the upper mold is partially converted into horizontal pressure toward the molding unit, which is conducive to the synchronous advancement of each molding unit and helps to achieve high-precision overall pressing and forming.

[0044] Preferably, the inner lower bottom angle of the enclosing frame is 15-60°.

[0045] Preferably, the outer inclined surface structures of the leading edge forming unit, the back surface forming unit and the basin surface forming unit are inclined inwards, with an inclination angle of 30-50°.

[0046] A method for integrally pressing a hollow guide vane is provided, using the above-mentioned device, and comprises the following steps:

[0047] S1: Prepreg processing: pre-design the covering process and cut the prepreg into the designed shape;

[0048] S2: Placement: Arrange the cut prepregs in order according to the laying process and preform them;

[0049] S3: Mold closing: After the prepreg is preformed, it is covered on the core mold, and the leading edge molding unit, the blade back molding unit and the blade basin molding unit are pushed in. The first upper mold, the second upper mold and the third upper mold are covered to complete the mold closing;

[0050] S4: De-moulding: Remove the second upper mould, the third upper mould and the first upper mould, and move out the second blade back side moulding block horizontally. The first blade back side moulding block and the third blade back side moulding block need to be tilted at some angle to be taken out, and move out the second blade basin surface moulding block horizontally. The first blade basin surface moulding block and the third blade back basin moulding block need to be tilted at some angle to be taken out, and move out the second leading edge moulding block horizontally. The first leading edge moulding block and the third leading edge moulding block need to be tilted at some angle to be taken out.

[0051] Preferably, the prepreg in step S1 is a silicon carbide fiber resin prepreg containing a curing agent.

[0052] Preferably, when closing the mold in step S3, the first upper mold, the second upper mold and the third upper mold are covered in sequence.

[0053] Preferably, during the step S4 of demoulding, the second upper mold, the third upper mold and the first upper mold are removed in sequence.

[0054] Preferably, during demoulding in step S4, the first blade back side molding block is taken out by tilting downward, and the third blade back side molding block is taken out by tilting upward.

[0055] Preferably, during demoulding in step S4, the first blade basin surface forming block is taken out by tilting downward, and the third blade back basin forming block is taken out by tilting upward.

[0056] Preferably, during the demoulding in step S4, the first leading edge forming block is taken out with a downward tilt, and the third leading edge forming block is taken out with an upward tilt.

[0057] Preferably, in step S3, after the mold is closed at room temperature, the temperature is increased during the infiltration stage, the core mold is gasified and removed during the infiltration stage, and after the molding is completed, step S4 is performed.

[0058] Preferably, in step S3, the first upper mold, the second upper mold and the third upper mold are pressed downward synchronously.

[0059] Compared with the prior art, the present invention has the following beneficial effects:

[0060] 1. Improved product strength index: The present invention adopts an integral pressing forming method, which makes up for the defect of serious loss of strength and function of foreign split structures.

[0061] 2. Product flow path surface is smooth: This invention adopts the integral pressing molding method. The flow path surface of the outer ring layer of the product fits the tooling seamlessly, with high molding precision. The overall contour error can be controlled within 0.3mm. The surface is smooth and high-precision hollow guide blades can be formed.

[0062] 3. Elimination of product interface problems: The present invention adopts an integral pressing molding method, and the product has no interface and related bonding problems, etc., which meets high-temperature working conditions.

[0063] 4. Easy to operate: When the tooling is used correctly, the present invention can adopt an ordinary press to control the pressurization process to achieve overall molding.

[0064] 5. The present invention does not destroy the integrity of the product structure, is not prone to forming irregular interfaces, ensures key indicators such as product strength, and reduces the docking process.

[0065] 6. The hollow guide vane product reinforced with silicon carbide fiber in this invention has a bending strength of ≥300 MPa and a fracture toughness of 2-5 MPa·m¹ / ², both of which are significantly higher than those produced by traditional split molding methods.

[0066] 7. The present invention can avoid the problem of material clamping on the leading edge through the structural design of the overall leading edge, and can avoid the problem of wrinkles on the blade basin surface through the synchronous advancement of the structural design of the leading edge molding unit, the back blade molding unit, and the blade basin surface molding unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 It is a structural schematic diagram of the leading edge molding unit, the back surface molding unit, the basin surface molding unit and the core mold of the present invention;

[0068] Figure 2 Schematic diagram of the structure of the leading edge molding unit of the present invention Figure 1 ;

[0069] Figure 3 Schematic diagram of the structure of the leading edge molding unit of the present invention Figure 2 ;

[0070] Figure 4 The structure of the blade back molding unit of the present invention is shown as follows Figure 1 ;

[0071] Figure 5 The structure of the blade back molding unit of the present invention is shown as follows Figure 2 ;

[0072] Figure 6 The structure of the blade basin surface forming unit of the present invention is shown as follows Figure 1 ;

[0073] Figure 7 The structure of the blade basin surface forming unit of the present invention is shown as follows Figure 2 ;

[0074] Figure 8 It is a schematic structural diagram of the leading edge forming unit, the back surface forming unit, the basin surface forming unit and the hollow guide vane of the present invention;

[0075] Figure 9 Schematic diagram of the molding surfaces of the leading edge molding unit, the back surface molding unit, and the blade basin molding unit of the present invention;

[0076] Figure 10 Schematic diagram of the overall structure of the pressing device of the present invention;

[0077] Figure 11 An exploded view of the pressing device of the present invention;

[0078] Figure 12 The cross section of the pressing device of the present invention is Figure 1 ;

[0079] Figure 13 The cross section of the pressing device of the present invention is Figure 2 ;

[0080] In the figure: 1-leading edge molding unit, 11-first leading edge molding block, 12-second leading edge molding block, 13-third leading edge molding block, 2-blade back molding unit, 21-first blade back molding block, 22-second blade back molding block, 23-third blade back molding block, 3-blade basin surface molding unit, 31-first blade basin surface molding block, 32-second blade basin surface molding block, 33-third blade back basin molding block, 4-core mold, 5-overflow area, 6-base, 7-upper mold, 71-first upper mold, 72-second upper mold, 73-third upper mold, 8-enclosing frame, 9-upper edge plate auxiliary molding block, 10-lower edge plate auxiliary molding block, a-hollow guide blade. DETAILED DESCRIPTION

[0081] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0082] Example 1

[0083] A hollow guide blade forming integral pressing device, such as Figure 1 As shown, it includes a leading edge molding unit 1 for molding the leading edge of the hollow guide blade a, a blade back molding unit 2 for molding the back side of the hollow guide blade a, a blade basin surface molding unit 3 for molding the blade basin surface of the hollow guide blade a, and a core mold 4 for molding the hollow flow channel of the hollow guide blade a.

[0084] Specifically, if Figures 2 and 3 As shown, the leading edge forming unit 1 includes a first leading edge forming block 11, a second leading edge forming block 12 and a third leading edge forming block 13, which are arranged in sequence from top to bottom.

[0085] like Figures 4 and 5 As shown, the blade back side molding unit 2 includes a first blade back side molding block 21, a second blade back side molding block 22 and a third blade back side molding block 23, and the first blade back side molding block 21, the second blade back side molding block 22 and the third blade back side molding block 23 are arranged in sequence from top to bottom.

[0086] like Figures 6 and 7 As shown, the blade basin surface forming unit 3 includes a first blade basin surface forming block 31, a second blade basin surface forming block 32 and a third blade back basin forming block 33, and the first blade basin surface forming block 31, the second blade basin surface forming block 32 and the third blade back basin forming block 33 are arranged in sequence from top to bottom.

[0087] When the hollow guide blade is integrally pressed and molded using the device of this embodiment, the prepreg is coated on the core mold 4, and then the leading edge molding unit 1, the blade back molding unit 2 and the blade basin molding unit 3 are surrounded by the outer side of the core mold 4, and the molds are closed and pressed. Figure 8 As shown, the core mold 4 is gasified and removed after the hollow flow channel is formed, and a hollow guide blade a is formed between the leading edge molding unit 1, the blade back molding unit 2 and the blade basin surface molding unit 3.

[0088] Example 2

[0089] A hollow guide blade molding integral pressing device, wherein the first leading edge molding block 11 and the second leading edge molding block 12, the second leading edge molding block 12 and the third leading edge molding block 13, the first blade back surface molding block 21 and the second blade back surface molding block 22, the second blade back surface molding block 22 and the third blade back surface molding block 23, the first blade basin surface molding block 31 and the second blade basin surface molding block 32, and the second blade basin surface molding block 32 and the third blade back basin molding block 33 are all positioned by guide grooves.

[0090] After the hollow guide blade a is formed between the leading edge molding unit 1, the blade back surface molding unit 2 and the blade basin surface molding unit 3, each molding block is removed to obtain the hollow guide blade a.

[0091] The specific dismantling method is: horizontally move out the second blade back side forming block 22, tilt the first blade back side forming block 21 downward to take out, tilt the third blade back side forming block 23 upward to take out, horizontally move out the second blade basin surface forming block 32, tilt the first blade basin surface forming block 31 downward to take out, tilt the third blade back basin forming block 33 upward to take out, horizontally move out the second leading edge forming block 12, tilt the first leading edge forming block 11 downward to take out, tilt the third leading edge forming block 13 upward to take out.

[0092] In this embodiment, the blade back molding unit 2 is removed first, followed by the blade basin molding unit 3, and finally the leading edge molding unit 1. This improves molding quality and significantly reduces problems such as blade basin wrinkles. The provision of guide grooves between the molding blocks facilitates the stable removal of the second molding block. The tilted removal of the first and third molding blocks protects the upper and lower edge panels from the impact of demolding, thereby improving molding quality.

[0093] As a preferred technical solution, each forming block can be connected to a driving member separately when each forming unit is dismantled, so as to achieve high-precision and stable dismantling of the forming blocks.

[0094] The rest is the same as Example 1.

[0095] Example 3

[0096] A hollow guide blade forming integral pressing device, such as Figure 9 As shown, the parting surface between the leading edge molding unit 1 and the blade basin surface molding unit 3 is located on the blade basin surface curve, the parting surface between the blade basin surface molding unit 3 and the blade back surface molding unit 2 is located on the blade back surface curve and is provided with an overflow area 5, and the parting surface between the blade back surface molding unit 2 and the leading edge molding unit 1 is located on the blade back surface curve.

[0097] In this embodiment, the position design of the parting surface protects the leading edge and avoids the phenomenon of material clamping. The position design of the overflow area 5 solves the problem of the fluidity of the fiber material and also serves as an exhaust channel, thereby improving the molding accuracy and quality.

[0098] The rest is the same as Example 2.

[0099] Example 4

[0100] A hollow guide blade forming integral pressing device, such as Figure 10 As shown, it also includes a base 6, an upper mold 7 and an enclosing frame 8.

[0101] Among them, such as Figure 11 As shown, the upper mold 7 includes a first upper mold 71, a second upper mold 72 and a third upper mold 73. The first upper mold 71 is located directly above the leading edge molding unit 1, the second upper mold 72 is located directly above the blade back surface molding unit 2, and the third upper mold 73 is located directly above the blade basin surface molding unit 3. The core mold 4 is connected to the second upper mold 72.

[0102] The base 6 is arranged below the leading edge molding unit 1 , the blade back surface molding unit 2 and the blade basin surface molding unit 3 , and the enclosing frame 8 is arranged around the outer side of the upper mold 7 .

[0103] Specifically, if Figure 12 As shown, the enclosing frame 8 has a single-side cross-section with a trapezoidal structure that is small at the top and large at the bottom, and the upper mold 7 has a single-side cross-section with a trapezoidal structure that is large at the top and small at the bottom. The outer side of the molding unit has a slope structure, the inner side of the upper mold fits with the slope of the molding unit, and the outer side fits with the slope of the enclosing frame 8.

[0104] The inclined surface design of this embodiment allows the downward pressure of the upper mold 7 to be partially converted into horizontal pressure on the molding units, so that the upper and lower pressing and horizontal pressing of the device are carried out synchronously and the molding units are advanced synchronously.

[0105] As a preferred technical solution, the inclined surface between the enclosing frame 8 and the upper mold 7 is at an angle of 15 to 60 degrees, and the inclined surface between the upper mold 7 and the molding unit is at an angle of 30 to 50 degrees.

[0106] When the device of this embodiment is used to perform integral compression molding of the hollow guide blade, the prepreg is wrapped on the core mold 4, pushed into the leading edge molding unit 1, the blade back molding unit 2, and the blade basin molding unit 3, covered with the first upper mold 71, the second upper mold 72, and the third upper mold 73, the molds are closed, pressed, and heated to form, the core mold 4 is gasified and removed, and after molding, the second upper mold 72, the third upper mold 73, and the first upper mold 71 are removed, the enclosing frame 8 is removed, the second blade back molding block 22 is moved out horizontally, the first blade back molding block 21 is taken out at an angle downward, and the third blade back molding block 23 is taken out at an angle upward, the second blade basin molding block 32 is moved out horizontally, the first blade basin molding block 31 is taken out at an angle downward, and the third blade back molding block 33 is taken out at an angle upward, the second leading edge molding block 12 is moved out horizontally, the first leading edge molding block 11 is taken out at an angle downward, and the third leading edge molding block 13 is taken out at an angle upward.

[0107] The rest is the same as Example 3.

[0108] Example 5

[0109] A hollow guide blade molding integral pressing device, after the first upper mold 71, the second upper mold 72 and the third upper mold 73 are pressed into place, a gap for molding the upper edge plate of the hollow guide blade a is left between the leading edge molding unit 1, the blade back molding unit 2 and the blade basin molding unit 3, and a gap for molding the lower edge plate of the hollow guide blade a is left between the leading edge molding unit 1, the blade back molding unit 2 and the blade basin molding unit 3 and the base 6.

[0110] Moreover, in this embodiment, an upper edge plate auxiliary forming block 9 is provided between the forming unit and the upper mold 7, and a lower edge plate auxiliary forming block 10 is provided between the forming unit and the base 6. Figure 13 As shown, the auxiliary forming blocks wrap around the upper and lower edge plates of the hollow guide blade a to facilitate subsequent cutting.

[0111] The rest is the same as Example 4.

[0112] The above description of the embodiments is intended to facilitate understanding and use of the invention by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the present invention is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention, without departing from the scope of the present invention, should be within the scope of protection of the present invention.

Claims

1. A method for integrally pressing a hollow guide blade, characterized in that: The hollow guide blade molding integral pressing device is used, and the device includes a leading edge molding unit (1), a blade back molding unit (2), a blade basin molding unit (3) and a core mold (4); The leading edge molding unit (1), the back surface molding unit (2) and the blade basin molding unit (3) are arranged outside the core mold (4) and are used to mold the leading edge, back surface and blade basin of the hollow guide blade respectively. The leading edge forming unit (1) comprises a first leading edge forming block (11), a second leading edge forming block (12) and a third leading edge forming block (13) which are arranged in sequence from top to bottom; The blade back side molding unit (2) comprises a first blade back side molding block (21), a second blade back side molding block (22) and a third blade back side molding block (23) which are arranged in sequence from top to bottom; The blade basin surface forming unit (3) comprises a first blade basin surface forming block (31), a second blade basin surface forming block (32) and a third blade back basin forming block (33) which are arranged in sequence from top to bottom; The device also includes a base (6) and an upper mold (7); The base (6) is arranged below the leading edge molding unit (1), the back blade molding unit (2) and the blade basin molding unit (3); the upper mold (7) is arranged above the leading edge molding unit (1), the back blade molding unit (2) and the blade basin molding unit (3); and the core mold (4) is connected to the upper mold (7); The upper mold (7) comprises a first upper mold (71), a second upper mold (72) and a third upper mold (73) corresponding to the leading edge molding unit (1), the blade back surface molding unit (2) and the blade basin surface molding unit (3), respectively; After the first upper mold (71), the second upper mold (72) and the third upper mold (73) are pressed into place, a gap for forming an upper edge plate of the hollow guide blade is left between the leading edge molding unit (1), the blade back molding unit (2) and the blade basin molding unit (3); A gap for forming a lower edge plate of the hollow guide blade is left between the leading edge forming unit (1), the blade back side forming unit (2), the blade basin surface forming unit (3) and the base (6); The device further comprises an enclosing frame (8), which is arranged on the base (6) and can be arranged around the outside of the upper mold (7); The enclosing frame (8) has a single-side cross-section with a trapezoidal structure that is smaller at the top and larger at the bottom, the upper mold (7) has a single-side cross-section with a trapezoidal structure that is larger at the top and smaller at the bottom, the leading edge molding unit (1), the back surface molding unit (2) and the blade basin molding unit (3) have an inclined surface structure on their outer sides, the inner side of the upper mold (7) is in contact with the leading edge molding unit (1), the back surface molding unit (2) and the blade basin molding unit (3), and the outer side is in contact with the enclosing frame (8); The method for integrally pressing and forming the hollow guide blades comprises the following steps: Mold closing: prepreg is coated on the core mold (4), and the leading edge molding unit (1), the blade back molding unit (2) and the blade basin molding unit (3) are pushed in, and the first upper mold (71), the second upper mold (72) and the third upper mold (73) are covered to complete the mold closing; Demolding: remove the second upper mold (72), the third upper mold (73) and the first upper mold (71), move out the second blade back molding block (22) horizontally, take out the first blade back molding block (21) and the third blade back molding block (23) at an inclined angle, move out the second blade basin surface molding block (32) horizontally, take out the first blade basin surface molding block (31) and the third blade back basin molding block (33) at an inclined angle, move out the second leading edge molding block (12) horizontally, take out the first leading edge molding block (11) and the third leading edge molding block (13) at an inclined angle.

2. The method for integrally pressing and forming a hollow guide vane according to claim 1, characterized in that: The first leading edge forming block (11) and the second leading edge forming block (12) are positioned via a guide groove, and the second leading edge forming block (12) and the third leading edge forming block (13) are positioned via a guide groove; The first leaf back side forming block (21) and the second leaf back side forming block (22) are positioned via a guide groove, and the second leaf back side forming block (22) and the third leaf back side forming block (23) are positioned via a guide groove; The first blade basin surface forming block (31) and the second blade basin surface forming block (32) are positioned via a guide groove, and the second blade basin surface forming block (32) and the third blade back basin forming block (33) are positioned via a guide groove.

3. The method for integrally pressing and forming a hollow guide vane according to claim 1, characterized in that: The first leading edge forming block (11), the second leading edge forming block (12), and the third leading edge forming block (13) are each independently connected to a driving member for driving the movement thereof; The first blade back side forming block (21), the second blade back side forming block (22), and the third blade back side forming block (23) are each independently connected to a driving member for driving the movement thereof; The first blade basin surface forming block (31), the second blade basin surface forming block (32) and the third blade back basin forming block (33) are each independently connected to a driving member for driving the movement thereof.

4. The method for integrally pressing and forming a hollow guide vane according to claim 1, characterized in that: The core mold (4) has the same shape as the hollow flow channel of the hollow guide blade to be formed, and is made of high-temperature gasification material and is gasified at high temperature.

5. The method for integrally pressing and forming a hollow guide vane according to claim 1, characterized in that: The parting surface between the leading edge molding unit (1) and the blade basin surface molding unit (3) is located on the blade basin surface curve of the hollow guide blade to be molded, the parting surface between the blade basin surface molding unit (3) and the blade back surface molding unit (2) is located on the blade back surface curve of the hollow guide blade to be molded, and the parting surface between the blade back surface molding unit (2) and the leading edge molding unit (1) is located on the blade back surface curve of the hollow guide blade to be molded.

6. The method for integrally pressing and forming a hollow guide vane according to claim 5, characterized in that: The two parting surfaces of the leading edge molding unit (1) are not on the same straight line, and the parting surface between the leading edge molding unit (1) and the blade basin surface molding unit (3) is closer to the intersection of the blade basin surface curve and the blade back surface curve of the hollow guide blade to be molded at the leading edge.

7. The integral pressing method for forming a hollow guide vane according to claim 5, characterized in that: An overflow area (5) is provided at the parting surface between the blade back surface molding unit (2) and the blade basin surface molding unit (3); The overflow area (5) is connected to a vertical overflow trough provided on the outside of the blade back surface forming unit (2) and the blade basin surface forming unit (3).

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