C / sic composite material profiled shaft forming tool and forming method

Abstract

The present invention discloses a C / SiC composite material profiled shaft forming tool and a forming method. The tool comprises an inner mold, two positioning clamping seats, and a first outer mold. Positioning pressing plates are disposed at the tops of the two positioning clamping seats, positioning holes are formed at each connecting position between a positioning clamping seat and a positioning pressing plate. The first outer mold is disposed between the two positioning clamping seats, and a second outer mold is disposed on the first outer mold. The inner mold is disposed in a gap formed by the first outer mold and the second outer mold, and a plurality of vent holes perpendicular to the molding surfaces are correspondingly formed on the inner mold, the first outer mold, and the second outer mold. The forming tool of the present invention has a simple structure, is easy to install, is easy to operate, and has reliable shaping. Relative positions of the inner mold, the first outer mold, and the second outer mold are ensured by means of positioning blocks, thereby ensuring that an inner circle and an outer circle of the profiled shaft prefabricated body are concentric, and thus a C / SiC composite material profiled shaft having a small bonding surface gap and high connecting strength is obtained.

Description

A C / SiC composite material special-shaped shaft forming tool and forming method thereof Technical Field

[0001] The present invention relates to the technical field of special-shaped shaft forming, and in particular to a C / SiC composite material special-shaped shaft forming tool and a forming method thereof. Background Art

[0002] The C / SiC composite special-shaped shaft in the C / SiC composite wing surface must provide both heat protection and primary load-bearing capabilities. Simulation calculations indicate that the maximum stress is located at the transition between the circular shaft and the flat plate. The existing molding process typically involves first making the composite circular shaft, then fabricating the outer P-type / R-type connecting plate, and then inserting the composite circular shaft into the P-type / R-type connecting plate. After assembly, an irregular gap exists between the two. Even when filled with the same material, a certain physical gap still exists, posing a risk of reduced connection strength. Furthermore, when conventional riveting and welding are used for assembly, the inner diameter of the inner shaft is narrow, resulting in too few rivet pins, which results in a weak connection.

[0003] Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a C / SiC composite material special-shaped shaft forming tool and a forming method thereof, so as to solve the problems of gaps and low connection strength in the C / SiC composite material special-shaped shaft prepared by the prior art.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A C / SiC composite material special-shaped shaft forming tool is provided, including: an inner mold, two positioning clamps and a first outer mold, the tops of the two positioning clamps are each provided with a positioning pressure plate, the connection between the two positioning clamps and the positioning pressure plate is provided with a positioning hole, the positioning hole matches the inner mold, and the positioning clamp is connected to the positioning pressure plate by a first bolt; the first outer mold is arranged between the two positioning clamps, the first outer mold is provided with a second outer mold, the gap formed between the first outer mold and the second outer mold matches the target special-shaped shaft, the first outer mold is provided with a first through hole, the second outer mold is provided with a first pin, the first pin matches the first through hole, and the first outer mold is connected to the second outer mold by a second bolt; the inner mold is arranged in the gap formed by the first outer mold and the second outer mold, and at the same time, both ends of the inner mold extend into the positioning holes, the inner mold matches the circular axis of the target special-shaped shaft, and a number of ventilation holes perpendicular to the molding surface are correspondingly provided on the inner mold, the first outer mold and the second outer mold.

[0006] The beneficial effects of the present invention are as follows: the present invention fixes the inner mold by the positioning holder and the positioning pressure plate, and then relatively fixes the first outer mold and the second outer mold by clamping the mold, thereby ensuring that the inner circle and outer circle of the special-shaped shaft preform are concentrically fixed.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows:

[0008] Furthermore, a limit block is provided on the inner mold, and a second pin and a third pin are provided on the limit block. A second through hole is provided on the first outer mold, and the second through hole matches the second pin; a third through hole is provided on the second outer mold, and the third through hole matches the third pin.

[0009] The beneficial effect of adopting the above further technical solution is: the present invention uses limit blocks to relatively fix the first outer mold, the second outer mold and the inner mold, thereby ensuring that the inner circle and the outer circle of the special-shaped shaft preform are concentric in the subsequent C / SiC composite material preparation process.

[0010] Furthermore, the number of the limiting blocks is 2.

[0011] Furthermore, a shaping platform is commonly provided at the bottom of the two positioning sockets, a fourth through hole is provided on the shaping platform, and a fourth pin is provided on both positioning sockets, the fourth pin matches the fourth through hole, and both positioning sockets are connected to the shaping platform through a third bolt.

[0012] The beneficial effect of adopting the above further technical solution is that the shaping platform can fix the positioning card seat, thereby ensuring the relative fixation of the positioning card seat and the positioning pressure plate, thereby ensuring the fixation of the inner mold.

[0013] Furthermore, a fifth through hole is provided on the first outer mold, and a fifth pin is provided on the shaping platform, and the fifth pin matches the fifth through hole.

[0014] The beneficial effect of adopting the above further technical solution is: positioning the first outer mold on the shaping platform can ensure that the inner circle and outer circle of the subsequent special-shaped shaft preform are concentrically fixed.

[0015] Furthermore, the target special-shaped shaft is a P-shaped special-shaped shaft or an R-shaped special-shaped shaft.

[0016] Furthermore, when the target special-shaped shaft is an R-shaped special-shaped shaft, a core mold is provided between the first outer mold and the second outer mold, and the core mold matches the R-shaped special-shaped shaft.

[0017] Furthermore, a sixth through hole is provided on the core mold, and pins are provided on both positioning seats, and the pins match the sixth through hole.

[0018] Furthermore, the diameter of the positioning hole is 0.08-1 mm smaller than the diameter of the inner mold.

[0019] The beneficial effects of adopting the above further technical solution are: the diameter of the positioning hole is 0.08-1mm smaller than the diameter of the inner mold, so that the inner mold can be fixed more tightly, the structure is simple, the disassembly and assembly are convenient, and the shaping is firm.

[0020] The present invention also provides a molding method for the C / SiC composite material special-shaped shaft molding tool, comprising the following steps:

[0021] S1: According to the design surface and size of the target special-shaped shaft, carbon fiber is wound in the center of the outer surface of the inner mold to obtain a special-shaped shaft preform clamped by the inner mold;

[0022] S2: Position the two positioning brackets on the shaping platform through the fourth pin, and then connect the two positioning brackets to the shaping platform through the third bolt;

[0023] S3: Position the first outer mold on the shaping platform through the fifth pin, place the special-shaped shaft preform clamped with the inner mold obtained in step S1 on the first outer mold, extend the two ends of the inner mold into the positioning holes, and fix the inner mold in place with a positioning pressure plate, confirm that the thickness dimensions of the special-shaped shaft preform clamped with the inner mold and the first outer mold meet the requirements, then remove the special-shaped shaft preform clamped with the inner mold and the first outer mold as a whole, and sew the first outer mold and the special-shaped shaft preform clamped with the inner mold at the flat plate into one with the vent hole as the suturing path to obtain the special-shaped shaft preform clamped with the inner mold and the first outer mold;

[0024] S4: The two ends of the inner mold of the special-shaped shaft preform obtained in step S3, which is clamped with the inner mold and the first outer mold, are respectively provided with limit blocks, and then the first outer mold is positioned on the shaping platform by the fifth pin, and the two ends of the inner mold are extended into the positioning holes, and the inner mold is fixed in place with the positioning pressure plate, and then the second outer mold is clamped in place, and the first outer mold and the second outer mold are positioned using the first pin, and the first outer mold and the second outer mold are positioned with the limit blocks using the second pin and the third pin, and the first outer mold is connected to the second outer mold by the second bolt to complete the shaping of the special-shaped shaft preform;

[0025] S5: The special-shaped shaft preform, the first outer mold, the second outer mold and the limit block that are clamped by the inner mold are removed as a whole, and the C / SiC composite material is prepared. After removing the inner mold, the first outer mold, the second outer mold and the limit block, the C / SiC composite material special-shaped shaft is obtained.

[0026] Furthermore, in step S1 , a through hole for passing the first pin and the second bolt is provided on the special-shaped shaft preform.

[0027] Furthermore, when the target special-shaped shaft in step S1 is a P-type special-shaped shaft, carbon fiber is wound in the center of the outer surface of the inner mold to obtain a first preform first, and a second preform is laid on the outside of the first preform. The vent hole is used as a sewing path to sew the overlapping part of the first preform and the second preform and the inner mold into one. Then, a third preform is placed in the gap formed by the overlapping part of the second preform and the first preform. The overlapping part of the second preform is then cut into place, and the third preform and the second preform are continued to be sewn into one with the vent hole as the sewing path to obtain a P-type preform clamped by the inner mold.

[0028] The beneficial effect of adopting the above further technical solution is that after filling the third preform into the corresponding position of the P-type preform, the problem of excessive gap between the joint surfaces can be solved, and the internal structure of the load-bearing part of the component can be kept tight, thereby meeting the strength requirements.

[0029] Furthermore, the third preform is prepared by the following method: the 3DN preform is processed and hole-formed in sequence to obtain the third preform.

[0030] Furthermore, the density of 3DN preform is 1.5-1.8g / cm 3 .

[0031] Furthermore, the diameter of the holes is 2 mm.

[0032] Furthermore, the third preform can also be manufactured by the following method: the carbon fiber cloth is cut and bonded in sequence to manufacture the third preform.

[0033] The beneficial effect of adopting the above further technical solution is that the carbon fiber cloth is relatively soft and can be closely attached to the first preform and the second preform, and no obvious interface exists subsequently.

[0034] Furthermore, when the target special-shaped shaft in step S1 is an R-shaped special-shaped shaft, carbon fiber is wound in the center of the outer surface of the inner mold to obtain a first preform first, and a second preform is laid on the outside of the first preform. The overlapping part of the first preform and the second preform and the inner mold are sewn together using the vent as the sewing path, and then the core mold is placed in the gap formed by the second preform, and the core mold and the second preform are continued to be sewn together using the vent as the sewing path to obtain an R-shaped preform clamped with the inner mold and the core mold; in step S4, after the first outer mold is connected to the second outer mold by the second bolt, the two positioning brackets are connected to the core mold by pins.

[0035] Furthermore, T300-3k fiber bundles were used for suturing.

[0036] Furthermore, in step S5, the CVI process is used to prepare the C / SiC composite material.

[0037] The present invention has the following beneficial effects:

[0038] 1. The C / SiC composite material special-shaped shaft forming tooling of the present invention has a simple structure, is easy to install and operate, and has a reliable shaping. It can ensure that the inner circle and outer circle of the special-shaped shaft preform are concentric, thereby obtaining a C / SiC composite material special-shaped shaft with a small bonding surface gap and high connection strength.

[0039] 2. The molding method of the present invention is simple, easy to operate, and easy to promote. The C / SiC composite material special-shaped shaft prepared by the method of the present invention can effectively solve the problems of gaps and low connection strength in the C / SiC composite material special-shaped shaft prepared by the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic diagram of the installation of a P-type preform on a forming tool;

[0041] FIG2 is a schematic diagram of the installation of the first outer mold, the positioning card seat and the shaping platform;

[0042] FIG3 is a schematic diagram of the bottom of FIG3 ;

[0043] FIG4 is a schematic diagram of the installation of a P-type preform on a forming tool when the second outer mold and the limit block are not installed;

[0044] FIG5 is a schematic diagram of the installation of an R-shaped preform on a molding tool when the second outer mold and the limit block are not installed;

[0045] FIG6 is a schematic diagram of the installation of an R-type preform on a molding tool;

[0046] Figure 7 is a schematic diagram of a P-shaped special-shaped shaft;

[0047] Figure 8 is a schematic diagram of an R-shaped special-shaped shaft;

[0048] FIG9 is a schematic diagram of the first preform forming process;

[0049] FIG10 is a schematic diagram of forming a second preform;

[0050] FIG11 is a schematic diagram of a third preform;

[0051] FIG12 is a P-type preform clamped with an inner mold;

[0052] FIG13 is an R-type preform clamped with an inner mold and a core mold.

[0053] Among them, 1. inner mold; 2. positioning holder; 3. positioning pressure plate; 4. positioning hole; 5. first bolt; 6. first outer mold; 7. second outer mold; 8. first pin; 9. second bolt; 10. limit block; 11. second pin; 12. third pin; 13. shaping platform; 14. fourth pin; 15. third bolt; 16. fifth through hole; 17. fifth pin; 18. P-type special-shaped shaft; 19. R-type special-shaped shaft; 20. core mold; 21. first preform; 22. second preform; 23. third preform; 24. pin shaft. DETAILED DESCRIPTION

[0054] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples are only used to explain the present invention and are not intended to limit the scope of the invention. In the embodiments, if specific conditions are not specified, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments is not specified, they are all conventional products that can be purchased commercially.

[0055] Please refer to Figure 1-13. A C / SiC composite material special-shaped shaft forming tool comprises an inner mold 1, two positioning clamps 2 and a first outer mold 6. The tops of the two positioning clamps 2 are each provided with a positioning pressure plate 3. The connection between the two positioning clamps 2 and the positioning pressure plate 3 is provided with a positioning hole 4, the positioning hole 4 matches the inner mold 1, and the positioning clamps 2 are connected to the positioning pressure plate 3 by a first bolt 5; the first outer mold 6 is arranged between the two positioning clamps 2, the first outer mold 6 is provided with a second outer mold 7, the gap formed between the first outer mold 6 and the second outer mold 7 matches the target special-shaped shaft, the first outer mold 6 is provided with a first through hole, the second outer mold 7 is provided with a first pin 8, the first pin 8 matches the first through hole, and the first outer mold 6 is connected to the second outer mold 7 by a second bolt 9; the inner mold 1 is arranged in the gap formed by the first outer mold 6 and the second outer mold 7, and both ends of the inner mold 1 extend into the positioning holes 4. The inner mold 1 matches the circular axis of the target special-shaped shaft. The inner mold 1, the first outer mold 6, and the second outer mold 7 are correspondingly provided with a plurality of vents perpendicular to the molding surface. The present invention fixes the inner mold 1 by the positioning holder 2 and the positioning pressure plate 3, and then fixes it relatively by the first outer mold 6 and the second outer mold 7, which can ensure that the inner circle and outer circle of the special-shaped shaft preform are concentrically fixed.

[0056] To maintain relative fixation between the first outer mold 6, the second outer mold 7, and the inner mold 1, thereby ensuring concentricity between the inner and outer circumferences of the special-shaped shaft preform during the subsequent C / SiC composite material preparation process, a stopper 10 is sleeved over the inner mold 1. This stopper 10 is equipped with a second pin 11 and a third pin 12. The first outer mold 6 is provided with a second through-hole that mates with the second pin 11; the second outer mold 7 is provided with a third through-hole that mates with the third pin 12. To ensure symmetrical fixation, two stoppers 10 are provided.

[0057] A common shaping platform 13 is provided at the bottom of the two positioning bases 2. A fourth through-hole is provided on the shaping platform 13. A fourth pin 14 is provided on each of the two positioning bases 2. The fourth pin 14 matches the fourth through-hole. Both positioning bases 2 are connected to the shaping platform 13 via a third bolt 15. The shaping platform 13 secures the positioning bases 2, thereby ensuring relative fixation between the positioning bases 2 and the positioning platen 3, and thus securing the inner mold 1.

[0058] The first outer mold 6 is provided with a fifth through hole 16, and the shaping platform 13 is provided with a fifth pin 17, which matches the fifth through hole 16. Positioning the first outer mold 6 on the shaping platform 13 can ensure that the inner and outer circles of the subsequent special-shaped shaft preform are concentrically fixed.

[0059] The target special-shaped shaft is a P-shaped special-shaped shaft 18 or an R-shaped special-shaped shaft 19. When the target special-shaped shaft is an R-shaped special-shaped shaft 19, a core mold 20 is provided between the first outer mold 6 and the second outer mold 7, and the core mold 20 matches the R-shaped special-shaped shaft 19. The core mold 20 is provided with a sixth through hole, and both positioning bases 2 are provided with a pin 24, which matches the sixth through hole.

[0060] The diameter of the positioning hole 4 is 0.08-1mm smaller than the diameter of the inner mold 1. The diameter of the positioning hole 4 is 0.08-1mm smaller than the diameter of the inner mold 1, so that the inner mold 1 can be fixed more tightly, the structure is simple, the disassembly and assembly are convenient, and the shaping is firm.

[0061] Example 1:

[0062] A molding method for a C / SiC composite material special-shaped shaft molding tool comprises the following steps:

[0063] S1: According to the design surface and size of the P-shaped special-shaped shaft 18, carbon fiber is wound in the center of the outer surface of the inner mold 1 to obtain the first preform 21 first, and the second preform 22 is laid on the outside of the first preform 21. The vent is used as the sewing path, and the T300-3k fiber bundle is used to sew the overlapping part of the first preform 21 and the second preform 22 and the inner mold 1 into one. Then, the third preform 23 is placed in the gap formed by the overlapping part of the second preform 22 and the first preform 21. Then, the overlapping part of the second preform 22 is cut into place, and the vent is continued to be used as the sewing path. The T300-3k fiber bundle is used to sew the third preform 23 and the second preform 22 into one, and a P-type preform clamped with the inner mold 1 is obtained (the P-type preform is provided with a through hole for passing the first pin 8 and the second bolt 9); wherein, the third preform 23 is obtained by the following method: a fiber having a density of 1.7 g / cm 3 The 3DN preform is processed and a 2 mm hole is made in turn to obtain a third preform 23;

[0064] S2: Position the two positioning holders 2 on the shaping platform 13 through the fourth pins 14 respectively, and then connect the two positioning holders 2 to the shaping platform 13 through the third bolts 15 respectively;

[0065] S3: Position the first outer mold 6 on the shaping platform 13 by the fifth pin 17, place the P-type preform clamped with the inner mold 1 obtained in step S1 on the first outer mold 6, and extend the two ends of the inner mold 1 into the positioning holes 4. Use the positioning pressure plate 3 to fix the inner mold 1 in place, confirm that the thickness dimensions of the P-type preform clamped with the inner mold 1 and the first outer mold 6 meet the requirements, then remove the P-type preform clamped with the inner mold 1 and the first outer mold 6 as a whole, use the vent hole as the suture path, and use T300-3k fiber bundles to sew the first outer mold 6 and the P-type preform clamped with the inner mold 1 at the flat plate into one, so as to obtain a P-type preform clamped with the inner mold 1 and the first outer mold 6;

[0066] S4: The inner mold 1 of the P-type preform obtained in step S3, which holds the inner mold 1 and the first outer mold 6, is respectively provided with limit blocks 10 at both ends. The first outer mold 6 is then positioned on the shaping platform 13 by the fifth pin 17. The two ends of the inner mold 1 are inserted into the positioning holes 4. The inner mold 1 is fixed in place with the positioning plate 3. The second outer mold 7 is then closed in place. The first outer mold 6 and the second outer mold 7 are positioned using the first pin 8. The first outer mold 6 and the second outer mold 7 are positioned with the limit blocks 10 using the second pin 11 and the third pin 12. The first outer mold 6 and the second outer mold 7 are respectively positioned with the limit blocks 10. The first outer mold 6 is connected to the second outer mold 7 by the second bolt 9. The shaping of the P-type preform is completed.

[0067] S5: The P-type preform, the first outer mold 6, the second outer mold 7 and the limit block 10 that are clamped by the inner mold 1 are removed as a whole, and the C / SiC composite material is prepared by the CVI process. After removing the inner mold 1, the first outer mold 6, the second outer mold 7 and the limit block 10, a C / SiC composite material special-shaped shaft is obtained.

[0068] Example 2:

[0069] A molding method for a C / SiC composite material special-shaped shaft molding tool comprises the following steps:

[0070] S1: According to the design profile and size of the R-shaped special-shaped shaft 19, carbon fiber is wound in the center of the outer surface of the inner mold 1 to obtain a first preform 21. The second preform 22 is laid on the outside of the first preform 21. The vent is used as a sewing path. T300-3k fiber bundles are used to sew the overlapping part of the first preform 21 and the second preform 22 to the inner mold 1 as a whole. Then, the core mold 20 is placed in the gap formed by the second preform 22. The vent is continued as a sewing path. T300-3k fiber bundles are used to sew the core mold 20 and the second preform 22 as a whole to obtain an R-shaped preform clamping the inner mold 1 and the core mold 20 (the R-shaped preform is provided with a through hole for passing the first pin 8 and the second bolt 9);

[0071] S2: Position the two positioning holders 2 on the shaping platform 13 through the fourth pins 14 respectively, and then connect the two positioning holders 2 to the shaping platform 13 through the third bolts 15 respectively;

[0072] S3: Position the first outer mold 6 on the shaping platform 13 through the fifth pin 17, place the R-type preform clamping the inner mold 1 and the core mold 20 obtained in step S1 on the first outer mold 6, and extend the two ends of the inner mold 1 into the positioning hole 4. Use the positioning pressure plate 3 to fix the inner mold 1 in place, confirm that the thickness dimensions of the R-type preform clamping the inner mold 1 and the core mold 20 and the first outer mold 6 meet the requirements, and then remove the R-type preform clamping the inner mold 1 and the core mold 20 and the first outer mold 6 as a whole. Use the vent hole as the suture path and use T300-3k fiber bundle to sew the first outer mold 6 and the R-type preform clamping the inner mold 1 and the core mold 20 together at the flat plate to obtain the R-type preform clamping the inner mold 1, the core mold 20 and the first outer mold 6;

[0073] S4: The inner mold 1 of the R-type preform obtained in step S3, which is clamped with the inner mold 1, the core mold 20 and the first outer mold 6, is respectively provided with limit blocks 10 at both ends, and then the first outer mold 6 is positioned on the shaping platform 13 by the fifth pin 17, and the two ends of the inner mold 1 are extended into the positioning holes 4, and the inner mold 1 is fixed in place with the positioning pressure plate 3, and then the second outer mold 7 is molded into place, and the first outer mold 6 and the second outer mold 7 are positioned using the first pin 8, and the first outer mold 6 and the second outer mold 7 are positioned with the limit blocks 10 using the second pin 11 and the third pin 12, respectively, and the first outer mold 6 and the second outer mold 7 are connected to the second outer mold 7 by the second bolt 9, and the two positioning bases 2 are connected to the core mold 20 by the pin shaft 24 to complete the shaping of the R-type preform;

[0074] S5: The R-type preform, the first outer mold 6, the second outer mold 7 and the limit block 10 holding the inner mold 1 and the core mold 20 are removed as a whole, and the C / SiC composite material is prepared by the CVI process. After removing the inner mold 1, the core mold 20, the first outer mold 6, the second outer mold 7 and the limit block 10, a C / SiC composite material special-shaped shaft is obtained.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A C / SiC composite material special-shaped shaft forming tool, characterized in that: include: An inner mold (1), two positioning clamps (2) and a first outer mold (6), the tops of the two positioning clamps (2) are each provided with a positioning pressure plate (3), the connection between the two positioning clamps (2) and the positioning pressure plate (3) is each provided with a positioning hole (4), the positioning hole (4) matches the inner mold (1), the positioning clamps (2) are connected to the positioning pressure plate (3) by a first bolt (5); the first outer mold (6) is arranged between the two positioning clamps (2), the first outer mold (6) is provided with a second outer mold (7), the gap formed between the first outer mold (6) and the second outer mold (7) is aligned with the target special-shaped shaft The first outer mold (6) is provided with a first through hole, the second outer mold (7) is provided with a first pin (8), the first pin (8) and the first through hole match each other, the first outer mold (6) is connected to the second outer mold (7) by a second bolt (9); the inner mold (1) is arranged in a gap formed by the first outer mold (6) and the second outer mold (7), and both ends of the inner mold (1) extend into the positioning hole (4), and the inner mold (1) matches the circular axis of the target special-shaped shaft; the inner mold (1), the first outer mold (6) and the second outer mold (7) are correspondingly provided with a plurality of vent holes perpendicular to the molding surface.

2. The C / SiC composite material special-shaped shaft forming tool according to claim 1, characterized in that: The inner mold (1) is sleeved with a limit block (10), and the limit block (10) is provided with a second pin (11) and a third pin (12); the first outer mold (6) is provided with a second through hole, and the second through hole matches the second pin (11); the second outer mold (7) is provided with a third through hole, and the third through hole matches the third pin (12).

3. The C / SiC composite material special-shaped shaft forming tool according to claim 1, characterized in that: A shaping platform (13) is commonly provided at the bottom of the two positioning sockets (2), a fourth through hole is provided on the shaping platform (13), a fourth pin (14) is provided on both the two positioning sockets (2), the fourth pin (14) matches the fourth through hole, and the two positioning sockets (2) are connected to the shaping platform (13) via a third bolt (15).

4. The C / SiC composite material special-shaped shaft forming tool according to claim 3, characterized in that: The first outer mold (6) is provided with a fifth through hole (16), and the shaping platform (13) is provided with a fifth pin (17), and the fifth pin (17) matches the fifth through hole (16).

5. The C / SiC composite material special-shaped shaft forming tool according to claim 1, characterized in that: The target special-shaped shaft is a P-shaped special-shaped shaft (18) or an R-shaped special-shaped shaft (19).

6. The C / SiC composite material special-shaped shaft forming tool according to claim 1, characterized in that: When the target special-shaped shaft is an R-shaped special-shaped shaft (19), a core mold (20) is arranged between the first outer mold (6) and the second outer mold (7), and the core mold (20) matches the R-shaped special-shaped shaft (19).

7. The C / SiC composite material special-shaped shaft forming tool according to claim 1, characterized in that: The diameter of the positioning hole (4) is 0.08-1 mm smaller than the diameter of the inner mold (1).

8. A molding method using the C / SiC composite material special-shaped shaft molding tool as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1: According to the design profile and size of the target special-shaped shaft, carbon fiber is wound centrally on the outer surface of the inner mold (1) to obtain a special-shaped shaft preform clamped by the inner mold (1); S2: positioning the two positioning holders (2) on the shaping platform (13) by means of the fourth pin (14), and then connecting the two positioning holders (2) to the shaping platform (13) by means of the third bolt (15); S3: The first outer mold (6) is positioned on the shaping platform (13) by means of the fifth pin (17), and the special-shaped shaft preform clamped by the inner mold (1) obtained in step S1 is placed on the first outer mold (6), with both ends of the inner mold (1) extending into the positioning holes (4), and the inner mold (1) is fixed in place with the positioning pressing plate (3), and it is confirmed that the thickness dimensions of the special-shaped shaft preform clamped by the inner mold (1) and the first outer mold (6) meet the requirements, and then the special-shaped shaft preform clamped by the inner mold (1) and the first outer mold (6) are removed as a whole, and the first outer mold (6) and the special-shaped shaft preform clamped by the inner mold (1) are sewn together at the flat plate with the vent hole as the sewing path, so as to obtain the special-shaped shaft preform clamped by the inner mold (1) and the first outer mold (6); S4: The inner mold (1) of the special-shaped shaft preform obtained in step S3, which is clamped with the inner mold (1) and the first outer mold (6), is respectively provided with limit blocks (10), and then the first outer mold (6) is positioned on the shaping platform (13) by the fifth pin (17), and the two ends of the inner mold (1) are inserted into the positioning holes (4), and the inner mold (1) is fixed in place by the positioning plate (3), and then the second outer mold (7) is closed in place, so that The first outer mold (6) and the second outer mold (7) are positioned using a first pin (8), the first outer mold (6) and the second outer mold (7) are positioned with a stop block (10) using a second pin (11) and a third pin (12), and the first outer mold (6) and the second outer mold (7) are connected with a second bolt (9) to complete the shaping of the special-shaped shaft preform; S5: The special-shaped shaft preform clamped by the inner mold (1), the first outer mold (6), the second outer mold (7) and the limit block (10) are removed as a whole, and the C / SiC composite material is prepared. After removing the inner mold (1), the first outer mold (6), the second outer mold (7) and the limit block (10), the C / SiC composite material special-shaped shaft is obtained.

9. The molding method of the C / SiC composite material special-shaped shaft molding tool according to claim 8, characterized in that: When the target special-shaped shaft in step S1 is a P-shaped special-shaped shaft (18), carbon fiber is wound in the center of the outer surface of the inner mold (1) to first obtain a first preform (21), and a second preform (22) is laid on the outer side of the first preform (21). The overlapping part of the first preform (21) and the second preform (22) and the inner mold (1) are sewn together using the vent as a sewing path. Then, a third preform (23) is placed in the gap formed by the overlapping part of the second preform (22) and the first preform (21). Then, the overlapping part of the second preform (22) is cut into place, and the third preform (23) and the second preform (22) are sewn together using the vent as a sewing path to obtain a P-shaped preform clamped by the inner mold (1).

10. The molding method of the C / SiC composite material special-shaped shaft molding tool according to claim 8, characterized in that: When the target special-shaped shaft in step S1 is an R-shaped special-shaped shaft (19), carbon fiber is wound in the center of the outer surface of the inner mold (1) to first obtain a first preform (21), and a second preform (22) is laid on the outer side of the first preform (21). The overlapping part of the first preform (21) and the second preform (22) and the inner mold (1) are sewn together using the vent as a sewing path, and then the core mold (20) is placed in the gap formed by the second preform (22). The core mold (20) and the second preform (22) are sewn together using the vent as a sewing path to obtain an R-shaped preform clamped by the inner mold (1) and the core mold (20); in step S4, after the first outer mold (6) is connected to the second outer mold (7) by the second bolt (9), the two positioning bases (2) are connected to the core mold (20) by the pin (24).

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