Hollow guide blade forming integral pressing device and method

Abstract

The invention relates to a hollow guide blade forming and integral pressing device and method. The device comprises a front edge forming unit, a blade back face forming unit, a blade basin face forming unit and a core mold. The front edge forming unit, the blade back face forming unit and the blade basin face forming unit are arranged on the outer side of the core mold in a surrounding mode and used for forming the front edge, the blade back face and the blade basin face of the hollow guide blade correspondingly. The front edge forming unit comprises a first front edge forming block, a second front edge forming block and a third front edge forming block which are sequentially arranged from top to bottom; the blade back face forming unit comprises a first blade back face forming block, a second blade back face forming block and a third blade back face forming block which are sequentially arranged from top to bottom. The blade basin face forming unit comprises a first blade basin face forming block, a second blade basin face forming block and a third blade basin face forming block which are sequentially arranged from top to bottom. Compared with the prior art, the method has the advantages of high forming precision and the like.

Description

Technical Field

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

[0002] A hollow guide vane (guide vane) includes a leading edge, a trailing edge, a suction surface, and a pressure surface. Among them, the leading edge is the front end of the guide vane and is the part that the fluid first contacts when flowing through the guide vane. The suction surface is the high-pressure side of the guide vane and is usually located upstream of the fluid flow direction. The pressure surface is the low-pressure side of the guide vane and is usually located downstream of the fluid flow direction. The hollow guide vane can be used as a turbine stator vane of an aeroengine and has strict requirements for dimensional accuracy.

[0003] Patent CN116652031A discloses a die and a stamping forming method for the forming of a guide pipe of a gas turbine stator vane, which can complete the forming of the important profile of the guide pipe through one positioning, reduce the error problem caused by repeated positioning in the forming process of the guide pipe, and greatly improve the accuracy of the prepared guide pipe. The overall contour error is within 0.10 mm. However, this die and method are only applicable to the processing of metal sheet materials. With the continuous development of aerospace technology, the requirements for materials are also constantly increasing. At present, most hollow guide vanes are made of high-performance ceramic materials such as silicon carbide fibers as reinforcements, impregnated with high-temperature resistant resins and then cured. If this die and method are used for forming, problems such as material clamping at the leading edge and wrinkles on the suction surface are likely to occur.

[0004] Existing resin-ceramic composite guide vanes mostly adopt a split forming method, dividing the flow passage surface of the guide vane into upper and lower end structures and an intermediate structure. After forming them separately, the three are pressed and bonded together. However, this method has the following disadvantages: First, it destroys the integrity of the product structure and greatly affects key indicators such as the strength of the product; second, due to the two irregular interfaces formed by the material characteristics of the product, it is difficult to dock and requires special treatment to achieve, increasing the process and manufacturing costs; third, such products generally work at high temperatures, and there is a specified value for the interface connection strength, and the existing bonding technology fails to fully meet the standard.

[0005] Patent CN105128353A discloses a forming die and a trailing edge coating method for an integrally cured composite stator vane, which realizes trailing edge coating and integral curing of all plies, can strengthen the integrity of the vane, and will not cause high-temperature damage to the vane. However, its forming accuracy is low and it is difficult to be applicable to the forming of hollow guide vanes. Summary of the Invention

[0006] The purpose of the present invention is to provide an integral pressing device and method for forming a hollow guide vane, 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 forming integral pressing device, comprising a leading edge forming unit, a back blade surface forming unit, a front blade surface forming unit and a core mold; The leading edge forming unit, the back blade surface forming unit and the front blade surface forming unit are arranged around the outside of the core mold, and are respectively used for forming the leading edge, the back blade surface and the front blade surface of the hollow guide vane; 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 which are arranged in sequence from top to bottom; The back blade surface forming unit comprises a first back blade surface forming block, a second back blade surface forming block and a third back blade surface forming block which are arranged in sequence from top to bottom; The front blade surface forming unit comprises a first front blade surface forming block, a second front blade surface forming block and a third front blade surface forming block which are arranged in sequence from top to bottom.

[0008] Preferably, the first leading edge forming block and the second leading edge forming block are positioned by a guide groove, and the second leading edge forming block and the third leading edge forming block are positioned by a guide groove.

[0009] Further preferably, a guide groove is arranged at the top of the second leading edge forming block, and a guide block is arranged at the bottom. A guide block corresponding to the guide groove at the top of the second leading edge forming block is arranged 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 arranged at the top of the third leading edge forming block.

[0010] Preferably, the first back blade surface forming block and the second back blade surface forming block are positioned by a guide groove, and the second back blade surface forming block and the third back blade surface forming block are positioned by a guide groove.

[0011] Further preferably, a guide groove is arranged at the top of the second back blade surface forming block, and a guide block is arranged at the bottom. A guide block corresponding to the guide groove at the top of the second back blade surface forming block is arranged at the bottom of the first back blade surface forming block, and a guide groove corresponding to the guide block at the bottom of the second back blade surface forming block is arranged at the top of the third back blade surface forming block.

[0012] Preferably, the first front blade surface forming block and the second front blade surface forming block are positioned by a guide groove, and the second front blade surface forming block and the third front blade surface forming block are positioned by a guide groove.

[0013] Further preferably, a guide groove is arranged at the top of the second front blade surface forming block, and a guide block is arranged at the bottom. A guide block corresponding to the guide groove at the top of the second front blade surface forming block is arranged at the bottom of the first front blade surface forming block, and a guide groove corresponding to the guide block at the bottom of the second front blade surface forming block is arranged at the top of the third front blade surface forming block.

[0014] Preferably, the tolerance of the guide block of each forming block is 0.003 - 0.005 mm.

[0015] 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 their movement.

[0016] Preferably, the first blade-back forming block, the second blade-back forming block, and the third blade-back forming block are each independently connected to a driving member for driving their movement.

[0017] Preferably, the first blade-basin forming block, the second blade-basin forming block, and the third blade-back basin forming block are each independently connected to a driving member for driving their movement.

[0018] Preferably, the core mold has the same shape as the hollow flow channel of the hollow guide vane to be formed, is made of a high-temperature gasification material, and gasifies at high temperature.

[0019] More preferably, the material of the core mold includes silicone, fluoride, or low-melting-point alloy.

[0020] Even more preferably, the material of the core mold includes DOWSIL™ 5166, Krytox™ GPL 460, or NQ™470.

[0021] More preferably, the gasification temperature of the core mold is higher than normal temperature and less than 1000 - 1100 °C.

[0022] Preferably, the parting surface between the leading-edge forming unit and the blade-basin forming unit is located on the blade-basin curve of the hollow guide vane to be formed, the parting surface between the blade-basin forming unit and the blade-back forming unit is located on the blade-back curve of the hollow guide vane to be formed, and the parting surface between the blade-back forming unit and the leading-edge forming unit is located on the blade-back curve of the hollow guide vane to be formed.

[0023] More preferably, the two parting surfaces of the leading-edge forming unit are not on the same straight line, and the parting surface between the leading-edge forming unit and the blade-basin forming unit is closer to the intersection of the blade-basin curve and the blade-back curve of the hollow guide vane to be formed at the leading edge.

[0024] More preferably, a flash area is provided at the parting surface between the blade-back forming unit and the blade-basin forming unit.

[0025] Even more preferably, the flash area is connected to a vertical flash groove provided outside the blade-back forming unit and the blade-basin forming unit.

[0026] Preferably, the contour tolerance of the forming surface of each forming block close to the core mold side is ±0.01 mm.

[0027] Preferably, the vertical flash groove penetrates the blade-back forming unit and the blade-basin forming unit up and down.

[0028] Preferably, the integral press-fitting device for forming a hollow guide vane further comprises a base and an upper die; The base is arranged below the leading edge forming unit, the back surface forming unit and the basin surface forming unit, the upper die is arranged above the leading edge forming unit, the back surface forming unit and the basin surface forming unit, and the core die is connected to the upper die.

[0029] More preferably, the upper die comprises a first upper die, a second upper die and a third upper die corresponding to the leading edge forming unit, the back surface forming unit and the basin surface forming unit respectively.

[0030] Even more preferably, the core die is connected to the second upper die.

[0031] Preferably, a channel for discharging the gas generated by the gasification of the core die is provided on the second upper die.

[0032] More preferably, the channel communicates with the overflow area at the parting surface between the back surface forming unit and the basin surface forming unit.

[0033] Preferably, a heating block is provided on the second upper die in the area corresponding to the core die.

[0034] Even more preferably, after the first upper die, the second upper die and the third upper die are press-fitted in place, a gap for forming the upper edge plate of the hollow guide vane is left between them and the leading edge forming unit, the back surface forming unit and the basin surface forming unit; A gap for forming the lower edge plate of the hollow guide vane is left between the leading edge forming unit, the back surface forming unit and the basin surface forming unit and the base.

[0035] More preferably, the integral press-fitting device for forming a hollow guide vane further comprises an enclosing frame, the enclosing frame is arranged on the base and can surround the outside of the upper die.

[0036] Even more preferably, the enclosing frame has a trapezoidal structure with a smaller upper section and a larger lower section in the unilateral cross-section, the upper die has a trapezoidal structure with a larger upper section and a smaller lower section in the unilateral cross-section, the outer sides of the leading edge forming unit, the back surface forming unit and the basin surface forming unit have an inclined surface structure, the inner side of the upper die is attached to the leading edge forming unit, the back surface forming unit and the basin surface forming unit, and the outer side is attached to the enclosing frame.

[0037] A wedge mechanism is formed between the enclosing frame and the upper die of the present invention, and a second wedge mechanism is formed between the upper die and the forming unit. Through the two wedge mechanisms, part of the downward pressure of the upper die is converted into a horizontal pressure towards the forming unit, which is beneficial to realizing the synchronous advancement of each forming unit and helps to realize high-precision integral press-forming.

[0038] Preferably, the inner lower bottom angle of the enclosing frame is 15 - 60°.

[0039] Preferably, the outer inclined surfaces of the leading edge forming unit, the back surface forming unit of the blade, and the front surface forming unit of the blade bowl are inclined inwardly, and the inclination angle is 30 to 50°.

[0040] An integral pressing method for forming a hollow guide vane is carried out by using the above device, and includes the following steps: S1: Prepreg treatment: The laying process is designed in advance, and the prepreg is cut into a designed shape; S2: Placement: The cut prepreg is arranged in an orderly manner according to the laying process and preformed; S3: Mold closing: After the prepreg is preformed, it is wrapped around the core mold, pushed into the leading edge forming unit, the back surface forming unit of the blade, and the front surface forming unit of the blade bowl, and the first upper mold, the second upper mold, and the third upper mold are covered to complete the mold closing; S4: Mold removal: The second upper mold, the third upper mold, and the first upper mold are removed in sequence. The second back surface forming block of the blade is translated out. The first back surface forming block and the third back surface forming block of the blade need to be taken out at an inclined angle. The second front surface forming block of the blade bowl is translated out. The first front surface forming block and the third front surface forming block of the blade bowl need to be taken out at an inclined angle. The second leading edge forming block is translated out. The first leading edge forming block and the third leading edge forming block need to be taken out at an inclined angle.

[0041] Preferably, the prepreg in step S1 is a silicon carbide fiber resin prepreg containing a curing agent.

[0042] 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.

[0043] Preferably, when removing the mold in step S4, the second upper mold, the third upper mold, and the first upper mold are removed in sequence.

[0044] Preferably, when removing the mold in step S4, the first back surface forming block of the blade is taken out by tilting downward, and the third back surface forming block of the blade is taken out by tilting upward.

[0045] Preferably, when removing the mold in step S4, the first front surface forming block of the blade bowl is taken out by tilting downward, and the third front surface forming block of the blade bowl is taken out by tilting upward.

[0046] Preferably, when removing the mold in step S4, the first leading edge forming block is taken out by tilting downward, and the third leading edge forming block is taken out by tilting upward.

[0047] Preferably, after closing the mold at room temperature in step S3, the temperature is raised in the infiltration stage. The core mold is vaporized and removed in the infiltration stage. After forming is completed, step S4 is carried out.

[0048] Preferably, the first upper mold, the second upper mold, and the third upper mold in step S3 are pressed downward synchronously.

[0049] Compared with the prior art, the present invention has the following beneficial effects: 1. Improvement in product strength index: The present invention adopts an integral compression molding method, which makes up for the serious defect of the strength function loss of the foreign split structure.

[0050] 2. Smoothness of the product flow channel surface: The present invention adopts an integral compression molding method. The flow channel surface of the outer layer of the product fits with the tooling, with seamless connection and high molding accuracy. The overall contour error can be controlled within 0.3 mm, and the surface is smooth, enabling the formation of high-precision hollow guide vanes.

[0051] 3. Elimination of product interface problems: The present invention adopts an integral compression molding method. The product has no interface and related bonding problems, etc., and can meet the high-temperature working conditions.

[0052] 4. Convenient operation: Under the condition of correctly using the tooling, the present invention can adopt an ordinary press to control the pressurization process to achieve integral molding.

[0053] 5. The present invention does not damage the integrity of the product structure, is not easy to form irregular interfaces, ensures key indicators such as product strength, and reduces the docking treatment process.

[0054] 6. The bending strength of the hollow guide vane product with silicon carbide fiber as the reinforcement in the present invention is ≥300 MPa, and the fracture toughness is 2 - 5 MPa·m¹ / ². Both indicators are significantly higher than those of the traditional split molding method.

[0055] 7. Through the structural design of the integral leading edge, the present invention can avoid the problem of leading edge clamping. Through the synchronous advancement structural design of the leading edge forming unit, the back surface forming unit of the blade, and the basin surface forming unit of the blade, the problem of wrinkles on the basin surface of the blade can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 is a schematic structural diagram of the leading edge forming unit, the back surface forming unit of the blade, the basin surface forming unit of the blade, and the core mold of the present invention; Figure 2 is a schematic structural diagram of the leading edge forming unit of the present invention Figure 1 ; Figure 3 is a schematic structural diagram of the leading edge forming unit of the present invention Figure 2 ; Figure 4 is a schematic structural diagram of the back surface forming unit of the blade of the present invention Figure 1 ; Figure 5 is a schematic structural diagram of the back surface forming unit of the blade of the present invention Figure 2 ; Figure 6 is a schematic structural diagram of the basin surface forming unit of the blade of the present invention Figure 1 ; Figure 7Schematic structure of the blade basin surface forming unit of the present invention Figure 2 ; Figure 8 Schematic structural diagrams of the leading edge forming unit, the blade back surface forming unit, the blade basin surface forming unit and the hollow guide vane of the present invention; Figure 9 Schematic diagrams of the forming surfaces of the leading edge forming unit, the blade back surface forming unit and the blade basin surface forming unit of the present invention; Figure 10 Schematic overall structure diagram of the pressing device of the present invention; Figure 11 Exploded view of the pressing device of the present invention; Figure 12 Cross-section of the pressing device of the present invention Figure 1 ; Figure 13 Cross-section of the pressing device of the present invention Figure 2 ; In the figure: 1 - leading edge forming unit, 11 - first leading edge forming block, 12 - second leading edge forming block, 13 - third leading edge forming block, 2 - blade back surface forming unit, 21 - first blade back surface forming block, 22 - second blade back surface forming block, 23 - third blade back surface forming block, 3 - blade basin surface forming unit, 31 - first blade basin surface forming block, 32 - second blade basin surface forming block, 33 - third blade back and basin forming 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 forming block, 10 - lower edge plate auxiliary forming block, a - hollow guide vane. Detailed implementation manners

[0057] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and gives detailed implementation manners and specific operation processes, but the protection scope of the present invention is not limited to the following embodiments.

[0058] Embodiment 1 A kind of integral pressing device for forming a hollow guide vane, as Figure 1 shown, includes a leading edge forming unit 1 for forming the leading edge of the hollow guide vane a, a blade back surface forming unit 2 for forming the blade back surface of the hollow guide vane a, a blade basin surface forming unit 3 for forming the blade basin surface of the hollow guide vane a, and a core mold 4 for forming the hollow flow channel of the hollow guide vane a.

[0059] Specifically, as Figures 2 - 3 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, and the first leading edge forming block 11, the second leading edge forming block 12 and the third leading edge forming block 13 are arranged in sequence from top to bottom.

[0060] As shown in Figures 4 - 5 FIG. 4, the back leaf forming unit 2 includes a first back leaf forming block 21, a second back leaf forming block 22 and a third back leaf forming block 23, which are arranged in sequence from top to bottom.

[0061] As shown in Figures 6 - 7 FIG. 5, the front leaf forming unit 3 includes a first front leaf forming block 31, a second front leaf forming block 32 and a third back front leaf forming block 33, which are arranged in sequence from top to bottom.

[0062] When using the device of this embodiment to integrally press and form a hollow guide vane, the prepreg is coated on the core mold 4, and then the leading edge forming unit 1, the back leaf forming unit 2 and the front leaf forming unit 3 are arranged around the core mold 4, and the mold is closed and pressed into shape. As shown in Figure 8 FIG. 6, after the hollow flow channel is formed, the core mold 4 is vaporized and removed, and a hollow guide vane a is formed between the leading edge forming unit 1, the back leaf forming unit 2 and the front leaf forming unit 3.

[0063] Embodiment 2 A device for integrally pressing and forming a hollow guide vane, between the first leading edge forming block 11 and the second leading edge forming block 12, between the second leading edge forming block 12 and the third leading edge forming block 13, between the first back leaf forming block 21 and the second back leaf forming block 22, between the second back leaf forming block 22 and the third back leaf forming block 23, between the first front leaf forming block 31 and the second front leaf forming block 32, and between the second front leaf forming block 32 and the third back front leaf forming block 33 are all positioned by guide grooves.

[0064] After the hollow guide vane a is formed between the leading edge forming unit 1, the back leaf forming unit 2 and the front leaf forming unit 3, each forming block is removed separately to obtain the hollow guide vane a.

[0065] The specific removal method is as follows: the second back leaf forming block 22 is translated out, the first back leaf forming block 21 is taken out by tilting downward, the third back leaf forming block 23 is taken out by tilting upward, the second front leaf forming block 32 is translated out, the first front leaf forming block 31 is taken out by tilting downward, the third back front leaf forming block 33 is taken out by tilting upward, the second leading edge forming block 12 is translated out, the first leading edge forming block 11 is taken out by tilting downward, and the third leading edge forming block 13 is taken out by tilting upward.

[0066] In this embodiment, first remove the back blade forming unit 2, then remove the front blade forming unit 3, and finally remove the leading edge forming unit 1, which is beneficial to improving the forming quality and significantly reducing problems such as wrinkles on the front blade. Through the setting of the guide grooves between the forming blocks, it is beneficial to stably remove the second forming block. The inclined removal methods of the first forming block and the third forming block are beneficial to protecting the upper and lower edge plates from the demolding impact force and improving the forming quality.

[0067] As a preferred technical solution, when removing each forming unit, each forming block can be respectively connected to a driving member to achieve high-precision and stable removal of the forming block.

[0068] The rest is the same as in Embodiment 1.

[0069] Embodiment 3 An integral pressing device for forming a hollow guide vane, as Figure 9 shown, the parting surface between the leading edge forming unit 1 and the front blade forming unit 3 is located on the front blade curve, the parting surface between the front blade forming unit 3 and the back blade forming unit 2 is located on the back blade curve and is provided with a flash area 5, and the parting surface between the back blade forming unit 2 and the leading edge forming unit 1 is located on the back blade curve.

[0070] In this embodiment, through the position design of the parting surface, the leading edge is protected and the material clamping phenomenon is avoided. Through the position design of the flash area 5, the fluidity problem of the fiber material is solved, and at the same time, it has the function of an exhaust channel, improving the forming accuracy and quality.

[0071] The rest is the same as in Embodiment 2.

[0072] Embodiment 4 An integral pressing device for forming a hollow guide vane, as Figure 10 shown, further includes a base 6, an upper die 7 and an enclosing frame 8.

[0073] Among them, as Figure 11 shown, the upper die 7 includes a first upper die 71, a second upper die 72 and a third upper die 73. The first upper die 71 is located directly above the leading edge forming unit 1, the second upper die 72 is located directly above the back blade forming unit 2, the third upper die 73 is located directly above the front blade forming unit 3, and the core die 4 is connected to the second upper die 72.

[0074] The base 6 is arranged below the leading edge forming unit 1, the back blade forming unit 2 and the front blade forming unit 3, and the enclosing frame 8 surrounds the outside of the upper die 7.

[0075] Specifically, as Figure 12 shown, the enclosing frame 8 has a trapezoidal structure with a smaller upper cross-section and a larger lower cross-section on one side, the upper die 7 has a trapezoidal structure with a larger upper cross-section and a smaller lower cross-section on one side, the outside of the forming unit has an inclined surface structure, the inner side of the upper die fits with the inclined surface of the forming unit, and the outer side fits with the inclined surface of the enclosing frame 8.

[0076] The inclined surface design of this embodiment enables part of the downward pressure of the upper mold 7 to be converted into horizontal pressure on the forming unit, allowing the vertical and horizontal pressing of the device to be synchronized, and each forming unit to be advanced synchronously.

[0077] As a preferred technical solution, the inclined surface between the enclosing frame 8 and the upper mold 7 forms an angle of 15 to 60 degrees, and the inclined surface between the upper mold 7 and the forming unit forms an angle of 30 to 50 degrees.

[0078] When using the device of this embodiment for integral pressing and forming of a hollow guide vane, the prepreg is wrapped around the core mold 4, and then pushed into the leading-edge forming unit 1, the back-surface forming unit 2, and the front-surface forming unit 3. The first upper mold 71, the second upper mold 72, and the third upper mold 73 are covered, and the mold is closed, pressed, and heated for forming. After the core mold 4 is vaporized and removed, after forming, the second upper mold 72, the third upper mold 73, and the first upper mold 71 are removed, the enclosing frame 8 is taken off, the second back-surface forming block 22 is translated out, the first back-surface forming block 21 is taken out by tilting downward, the third back-surface forming block 23 is taken out by tilting upward, the second front-surface forming block 32 is translated out, the first front-surface forming block 31 is taken out by tilting downward, the third back-front forming block 33 is taken out by tilting upward, the second leading-edge forming block 12 is translated out, the first leading-edge forming block 11 is taken out by tilting downward, and the third leading-edge forming block 13 is taken out by tilting upward.

[0079] The rest is the same as in Embodiment 3.

[0080] Embodiment 5 For an integral pressing device for forming a hollow guide vane, after the first upper mold 71, the second upper mold 72, and the third upper mold 73 are pressed in place, there is a gap for forming the upper edge plate of the hollow guide vane a between them and the leading-edge forming unit 1, the back-surface forming unit 2, and the front-surface forming unit 3. There is a gap for forming the lower edge plate of the hollow guide vane a between the leading-edge forming unit 1, the back-surface forming unit 2, and the front-surface forming unit 3 and the base 6.

[0081] Moreover, in this embodiment, an upper-edge plate auxiliary forming block 9 is further provided between the forming unit and the upper mold 7, and a lower-edge plate auxiliary forming block 10 is further provided between the forming unit and the base 6. As Figure 13 shown, the auxiliary forming blocks wrap around the peripheries of the upper and lower edge plates of the hollow guide vane a, facilitating subsequent material cutting.

[0082] The rest is the same as in Embodiment 4.

[0083] The above description of the embodiments is provided to enable those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative efforts. Therefore, the present invention is not limited to the above embodiments, and all improvements and modifications made by those skilled in the art without departing from the scope of the present invention should be within the protection scope of the present invention according to the disclosure of the present invention.

Claims

1. A hollow guide vane forming integral pressing device, characterized in that, It includes a leading-edge forming unit (1), a blade-back forming unit (2), a blade-basin forming unit (3), and a core mold (4); The leading-edge forming unit (1), the blade-back forming unit (2), and the blade-basin forming unit (3) are arranged around the outside of the core mold (4) and are respectively used for forming the leading edge, the blade back, and the blade basin of the hollow guide vane; 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) arranged in sequence from top to bottom; The blade-back forming unit (2) includes a first blade-back forming block (21), a second blade-back forming block (22), and a third blade-back forming block (23) arranged in sequence from top to bottom; The blade-basin forming unit (3) includes a first blade-basin forming block (31), a second blade-basin forming block (32), and a third blade-back-basin forming block (33) arranged in sequence from top to bottom.

2. The integral pressing device for forming a hollow guide vane according to claim 1, wherein The first leading-edge forming block (11) and the second leading-edge forming block (12) are positioned by a guide groove, and the second leading-edge forming block (12) and the third leading-edge forming block (13) are positioned by a guide groove; The first blade-back forming block (21) and the second blade-back forming block (22) are positioned by a guide groove, and the second blade-back forming block (22) and the third blade-back forming block (23) are positioned by a guide groove; The first blade-basin forming block (31) and the second blade-basin forming block (32) are positioned by a guide groove, and the second blade-basin forming block (32) and the third blade-back-basin forming block (33) are positioned by a guide groove.

3. The integral pressing device for forming a hollow guide vane according to claim 1, wherein The first leading-edge forming block (11), the second leading-edge forming block (12), and the third leading-edge forming block (13) are respectively independently connected with driving parts for driving their movement; The first blade-back forming block (21), the second blade-back forming block (22), and the third blade-back forming block (23) are respectively independently connected with driving parts for driving their movement; The first blade-basin forming block (31), the second blade-basin forming block (32), and the third blade-back-basin forming block (33) are respectively independently connected with driving parts for driving their movement.

4. The integral pressing device for 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 to-be-formed hollow guide vane and is made of a high-temperature gasification material, which gasifies at high temperature.

5. The integral pressing device for forming a hollow guide vane according to claim 1, wherein, The parting surface between the leading-edge forming unit (1) and the blade-basin forming unit (3) is located on the blade-basin curve of the to-be-formed hollow guide vane, the parting surface between the blade-basin forming unit (3) and the blade-back forming unit (2) is located on the blade-back curve of the to-be-formed hollow guide vane, and the parting surface between the blade-back forming unit (2) and the leading-edge forming unit (1) is located on the blade-back curve of the to-be-formed hollow guide vane.

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

7. The integral pressing device 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 forming unit (2) and the blade-basin forming unit (3); The overflow area (5) is connected to a vertical overflow chute disposed outside the blade back forming unit (2) and the blade basin surface forming unit (3).

8. The integral pressing device for forming a hollow guide vane according to claim 1, wherein, It further includes a base (6) and an upper mold (7); The base (6) is disposed below the leading edge forming unit (1), the blade back forming unit (2) and the blade basin surface forming unit (3), and the upper mold (7) is disposed above the leading edge forming unit (1), the blade back forming unit (2) and the blade basin surface forming unit (3). The core mold (4) is connected to the upper mold (7); The upper mold (7) includes a first upper mold (71), a second upper mold (72) and a third upper mold (73) corresponding to the leading edge forming unit (1), the blade back forming unit (2) and the blade basin surface forming unit (3) respectively.

9. The integral pressing device for forming a hollow guide vane according to claim 8, wherein, After the first upper mold (71), the second upper mold (72) and the third upper mold (73) are pressed in place, there is a gap for forming the upper edge plate of the hollow guide vane between them and the leading edge forming unit (1), the blade back forming unit (2) and the blade basin surface forming unit (3); There is a gap for forming the lower edge plate of the hollow guide vane between the leading edge forming unit (1), the blade back forming unit (2) and the blade basin surface forming unit (3) and the base (6).

10. A method for integrally pressing and forming a hollow guide vane, characterized in that, Using the device according to any one of claims 1 to 9, it includes the following steps: Closing the mold: The prepreg is wrapped around the core mold (4), pushed into the leading edge forming unit (1), the blade back forming unit (2) and the blade basin surface forming unit (3), and the first upper mold (71), the second upper mold (72) and the third upper mold (73) are covered to complete the closing of the mold; Removing the mold: The second upper mold (72), the third upper mold (73) and the first upper mold (71) are removed, the second blade back forming block (22) is translated out, the first blade back forming block (21) and the third blade back forming block (23) are taken out at an inclined angle, the second blade basin surface forming block (32) is translated out, the first blade basin surface forming block (31) and the third blade back and basin forming block (33) are taken out at an inclined angle, the second leading edge forming block (12) is translated out, and the first leading edge forming block (11) and the third leading edge forming block (13) are taken out at an inclined angle.

Images