Composite material thermal diaphragm forming tool and method

Abstract

A composite material thermal diaphragm forming tool and method, belonging to the field of aviation composite material forming. The core mold platform is located on a support frame, and the left half mold and the right half mold are arranged side by side on the core mold platform. A plurality of positioning blocks are provided at the lower part between the left half mold and the right half mold. The plurality of positioning blocks are positioned with the left half mold and are detachably fixedly connected. The right half mold is positioned by a plurality of positioning blocks; the right half mold is locked and positioned by a plurality of locking blocks of the core mold platform. Two pressure cover plates are placed on the left half mold and the right half mold respectively, and the two pressure cover plates are detachably fastened to the left half mold and the right half mold. The method is: preparation before thermal diaphragm forming; placing a laminate on the core mold; aligning the core mold; placing the laminate on the edge strip on the aligned left and right half molds, and sealing with a vacuum bag; high temperature forming; completing the forming of the composite material part. The composite material part formed by the tool and method of the present invention has high outer surface precision, and is particularly suitable for the forming of composite material vertical tail thermal diaphragm forming parts.

Description

Technical Field

[0001] The invention belongs to the field of aviation composite material molding, and particularly relates to a composite material thermal diaphragm molding tool and method. Background Art

[0002] Carbon fiber composites are increasingly used in aircraft due to their high specific strength and modulus, lightweight, corrosion and fatigue resistance, and strong designability. The application of composites in aircraft has gradually evolved from non-load-bearing and secondary load-bearing parts to primary load-bearing components, and is developing in a direction of larger, more complex, and more integrated design. The amount of advanced composite materials used has become a key indicator of an aircraft's sophistication.

[0003] Composite parts are usually formed by vacuum bag method, and composite vertical tail thermal diaphragm forming parts (including composite long stringers, wall panels, etc.) are formed. Due to the high requirements for outer surface roughness, direct vacuum bag forming cannot meet the outer surface roughness requirements, so other forming methods need to be sought. Summary of the Invention

[0004] The present invention aims to solve the problems existing in the background art by providing a composite material thermal diaphragm forming tool and method. The tool and method of the present invention can be used to form composite material molded parts with high outer surface precision requirements, and are particularly suitable for forming composite material vertical tail thermal diaphragm molded parts.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A composite material thermal diaphragm forming tool comprises a core mold assembly, a core mold platform, a support frame and two pressurized cover plates, wherein the core mold assembly consists of a core mold and a plurality of positioning blocks, and the core mold consists of a left half mold and a right half mold; the core mold platform is located on the support frame, the left half mold and the right half mold are arranged side by side on the core mold platform, the left half mold is detachably fixedly connected to the core mold platform, a plurality of positioning blocks are provided at the lower portion between the left half mold and the right half mold, the plurality of positioning blocks are positioned and detachably fixedly connected to the left half mold, and the right half mold is positioned by the plurality of positioning blocks; the core mold is locked and positioned by a plurality of locking blocks of the core mold platform, and the two pressurized cover plates are respectively placed on the left half mold and the right half mold, and the two pressurized cover plates are detachably fastened to the left half mold and the right half mold.

[0007] Furthermore, two sheet positioning blocks are fixed correspondingly to the front and rear ends of the upper end faces of the left half mold and the right half mold respectively.

[0008] Furthermore, a plurality of positioning grooves are provided on the right half mold at positions corresponding to the plurality of positioning blocks, and each positioning block is matched and arranged in the corresponding positioning groove.

[0009] Furthermore, the core mold platform includes a core mold support platform, multiple blocks, multiple locking blocks, multiple positioning pins 1, multiple positioning pins 2 and multiple lifting rings 1; the core mold support platform is fixed on the support frame, and multiple positioning pins 1 are fixed on the left side of the upper end surface of the core mold support platform along the length direction, and multiple positioning pins 2 are fixed on the right side of the upper end surface of the core mold support platform along the length direction. Long holes are provided on the multiple locking blocks, and the multiple locking blocks are slidably set on the upper end surface of the core mold support platform, and the long hole gap of each locking block is sleeved on the corresponding positioning pin 2. Multiple L-shaped locking grooves are fixed on the bottom of the outer side surface of the right half mold along the length direction. When the right half mold is locked and positioned, the locking block is matched and set in the L-shaped locking groove; multiple blocks are fixed on the right side of the upper end surface of the core mold support platform along the length direction, and multiple lifting rings 1 are fixed on the left and right sides of the upper end surface of the core mold support platform at equal intervals along the length direction.

[0010] Furthermore, the support frame includes a rigid top plate, multiple square steel pipes and four guide blocks; the multiple square steel pipes are arranged horizontally and vertically and welded into a rectangular frame, the rectangular frame is divided into two layers, the rigid top plate is laid on the upper layer of the rectangular frame, the rigid top plate is welded to the rectangular frame, and guide blocks are respectively fixed at the four corners of the upper end of the rectangular frame, and multiple lifting rings are fixed on the left and right sides of the support frame at equal intervals along the length direction.

[0011] Furthermore, reinforcing ribs are fixed on the inner walls of the left and right half molds.

[0012] Furthermore, the two pressure cover plates are composed of a cover plate, a spring and a screw; a plurality of countersunk holes are provided on the cover plate, and threaded holes are provided at positions corresponding to the plurality of countersunk holes on the left half mold and the right half mold. A screw with a spring is inserted into each countersunk hole, and the screw is threadedly fastened to the corresponding threaded hole.

[0013] Furthermore, the composite material thermal diaphragm forming tooling also includes two drilling jigs; the two drilling jigs are positioned with the inner side walls at both ends of the left half mold and are detachably fixedly connected.

[0014] Furthermore, the composite material thermal diaphragm forming tool also includes a storage box; the storage box is fixedly placed on the lower layer of the rectangular frame, and the storage box is divided into multiple storage rooms.

[0015] A composite material thermal insulation film forming method, the method comprising the following steps:

[0016] Step 1: Preparation before hot diaphragm: clean the tooling and apply release agent to prepare the tooling for use; then, lay the single laminate;

[0017] Step 2: Place the laminate on the core mold; before the left and right mold halves are aligned, open the right mold half and lock the right mold half with the locking block and L-shaped locking groove. Then, place the laid laminate on the left and right mold halves, position the laminate with the sheet positioning block, and place a pressure cover on the positioned laminate. The pressure cover is tightly connected to the left and right mold halves with screws and springs.

[0018] Step 3: Align the core mold; transport the tooling to the hot diaphragm machine to perform hot diaphragm molding on the left and right half molds respectively. After the hot diaphragm molding is completed, align the left and right half molds, position them using the positioning block, and check whether the left and right half molds are aligned properly after alignment;

[0019] Step 4: Vacuum bag sealing: Place the laminate on the edge strip on the aligned left and right mold halves, then place the breathable felt, seal the left and right mold halves 7 and 8 with a vacuum bag, seal the edge of the vacuum bag and the core mold platform with sealing tape, and draw a full vacuum to a minimum of 0.08 MPa. Check the vacuum bag for airtightness to ensure there is no leakage.

[0020] Step 5: High temperature molding: Place the tooling into the autoclave for molding. Perform thermal uniformity test and air tightness test according to vacuum requirements. After passing the test, proceed to the next step of high temperature molding. The high temperature molding temperature is 135-150℃, the pressure is 0.6MPa, and the temperature and pressure are kept constant for 120-180min. The vacuum negative pressure reading is tested to drop no more than 0.017MPa. After that, the temperature is lowered to room temperature. The heating and cooling rates are 1-2℃ / min.

[0021] Step 6: Complete the molding of the composite molded parts; move the tooling out of the autoclave, remove the vacuum bag and breathable felt, and perform demolding. During the demolding process, it must be ensured that no damage is caused to the composite molded parts. After demolding, clean and trim the edges of the composite molded parts.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention adopts Invar (INVAR36) to make the core mold, and the selection of materials ensures the same thermal expansion ratio of the composite material and the tooling material, which makes it easier to form parts.

[0024] 2. The use of multi-segment positioning of the core mold (i.e., multiple positioning blocks are set at equal intervals for positioning) solves the problem of inaccurate positioning of large-size tooling (length of 10-30 meters) and improves the molding quality of parts.

[0025] 3. An oil-free linear slider is fixed at the bottom of the core mold, which solves the problems of laborious, time-consuming and difficult movement of large-sized tooling and parts, making it more convenient for workers to operate.

[0026] 4. The support frame and core mold support platform adopt a split structure, which increases the overall strength of each and saves manufacturing costs.

[0027] 5. The connection part of the pressure cover adopts a screw plus spring design, which has sufficient pressing force and is conducive to the molding of parts.

[0028] 6. The storage box is designed with one item per box, so you can intuitively see the number of detachable parts, which is convenient for inventory, prevents loss, and is convenient for staff to operate.

[0029] 7. Compared with traditional manual laying, the composite material hot diaphragm forming method of the present invention reduces many defects caused by manual laying, increases laying accuracy, and improves production efficiency. The current domestic manual bending process will cause fiber wrinkling and buckling in the R-angle area, and manual bending is difficult to bend large-sized and thick parts. The product quality is not guaranteed and is difficult to achieve. The parts produced by hot diaphragm bending are of high quality and good effect.

[0030] In summary, the outer surface accuracy of the composite material molded parts formed by the tooling and method of the present invention can reach ±0.1mm, and is particularly suitable for the molding of composite material vertical tail thermal diaphragm molded parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is an axonometric diagram of the overall structure of a composite material thermal diaphragm forming tooling of the present invention;

[0032] Figure 2 This is a front view of a composite material thermal diaphragm forming tool of the present invention;

[0033] Figure 3 yes Figure 2 Top view;

[0034] Figure 4 yes Figure 2 Left view;

[0035] Figure 5 This is a partial enlarged view of the core mold assembly;

[0036] Figure 6 It is a partial enlarged view of the positioning position of the left and right half molds;

[0037] Figure 7 Axonometric drawing of the overall structure of the core mold platform;

[0038] Figure 8 yes Figure 7 A partial enlarged view of the middle stopper and locking block set on the core mold support platform;

[0039] Figure 9 This is an axonometric view of the supporting frame, with the steel plates not shown;

[0040] Figure 10 yes Figure 9 A partial enlarged view of guide blocks fixed at the four corners of the upper end of the rectangular frame;

[0041] Figure 11 It is an axonometric view of the pressurized cover;

[0042] Figure 12 It is an axonometric drawing of the drilling jig;

[0043] Figure 13 This is an axonometric drawing of a storage box.

[0044] The names and reference numerals of the components involved in the above drawings are as follows:

[0045] Core mold assembly 1, core mold platform 2, support frame 3, pressure cover plate 4, drilling template 5, storage box 6, left half mold 7, right half mold 8, positioning block 9, rigid top plate 10, stop block 11, locking block 12, cover plate 13, core mold support platform 14, positioning pin 15, positioning pin 2 16, lifting ring 17, square steel pipe 18, guide block 19, lifting ring 20, spring 21, sheet positioning block 22, L-shaped locking groove 23. DETAILED DESCRIPTION

[0046] The technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0047] Specific implementation method 1: Figures 1-13As shown, this embodiment discloses a composite material thermal diaphragm forming tool, including a core mold assembly 1 (Invar36), a core mold platform 2 (Invar36), a support frame 3 (Q235-AF) and two pressure cover plates 4 (6061-T651), the core mold assembly 1 is composed of a core mold and a plurality of positioning blocks 9, and the core mold is composed of a left half mold 7 and a right half mold 8; the core mold platform 2 is located on the support frame 3, and the left half mold 7 and the right half mold 8 are arranged side by side on the core mold platform 2, and the left half mold 7 is detachably fixedly connected to the core mold platform 2 (by screws), and the left half mold 7 is detachably fixedly connected to the core mold platform 2. A plurality of positioning blocks 9 are provided at the lower part between the half mold 7 and the right half mold 8. The plurality of positioning blocks 9 are positioned with the left half mold 7 (by pins) and are detachably fixedly connected (by screws). The right half mold 8 is positioned by the plurality of positioning blocks 9 (which play the role of positioning the left half mold 7 and the right half mold 8 relative to each other); the core mold is locked and positioned by a plurality of locking blocks 12 of the core mold platform 2 (the locking blocks 12 are used to lock the core mold to prevent the core mold from moving during the hot diaphragm molding process). The two pressure cover plates 4 are respectively placed on the left half mold 7 and the right half mold 8. The two pressure cover plates 4 are detachably fastened to the left half mold 7 and the right half mold 8.

[0048] Furthermore, if Figure 1 、 Figure 6 As shown, a plurality of positioning grooves are provided on the right half mold 8 at positions corresponding to the plurality of positioning blocks 9, and each positioning block 9 is matched and arranged in the corresponding positioning groove (preferably, a plurality of positioning blocks 9 are arranged at equal intervals along the length direction of the left half mold 7 and the right half mold 8, with a spacing of 2M, to ensure that the relative positioning of the left half mold 7 and the right half mold 8 is accurate).

[0049] Furthermore, if Figure 5 As shown, two sheet positioning blocks 22 are fixed to the front and rear ends of the upper ends of the left half mold 7 and the right half mold 8 respectively (used to position the laminate, so that the layer dropping position of the laminate coincides with the left half mold 7 and the right half mold 8, ensuring that the relative position of the laminate will not move. An oil-free linear slider is fixed to the bottom of the right half mold 8 to ensure that the right half mold 8 moves smoothly during mold closing and demolding).

[0050] Furthermore, if Figure 1 、 Figure 7 、 Figure 8As shown, the core mold platform 2 includes a core mold support platform 14 (the cross section of the core mold support platform 14 is trapezoidal, and the core mold support platform 14 is welded by steel plates, and the steel plates are arranged horizontally and vertically, so that the core mold support platform 14 has sufficient rigidity), multiple blocks 11, multiple locking blocks 12, multiple positioning pins 15, multiple positioning pins 16 and multiple lifting rings 17; the core mold support platform 14 is fixed on the support frame 3, and multiple positioning pins 15 are fixed on the left side of the upper end face of the core mold support platform 14 along the length direction, and multiple positioning pins 16 are fixed on the right side of the upper end face of the core mold support platform 14 along the length direction, and multiple locking blocks 12 are provided with long holes, and multiple locking blocks 12 are slidably set on the upper end face of the core mold support platform 14, and each locking block 12 has a The long hole gap is sleeved on the corresponding positioning pin 2 16 (the locking block 12 can move within the long hole range), and a plurality of L-shaped locking grooves 23 are fixed along the length direction at the bottom of the outer side surface of the right half mold 8. When the right half mold 8 is locked and positioned, the locking block 12 is matched and set in the L-shaped locking groove 23; a plurality of stoppers 11 are fixed along the length direction on the right side of the upper end surface of the core mold support platform 14 (the stoppers 11 are used to position the core mold assembly 1, and the locking blocks 12 are used to lock the core mold assembly 1 to prevent the core mold assembly 1 from moving during use and affecting the molding of composite parts), and a plurality of lifting rings 17 are fixed on the left and right sides of the upper end surface of the core mold support platform 14 at equal intervals along the length direction (a plurality of lifting rings 17 are used for transporting the core mold platform 2 and the core mold assembly 1).

[0051] Furthermore, if Figure 1 、 Figure 9 、 Figure 10 As shown, the support frame 3 includes a rigid top plate 10, a plurality of square steel pipes 18 and four guide blocks 19; the plurality of square steel pipes 18 are arranged horizontally and vertically and welded into a rectangular frame, the rectangular frame is divided into two layers, the rigid top plate 10 is laid on the upper layer of the rectangular frame, the rigid top plate 10 is welded to the rectangular frame, and guide blocks 19 are fixed (by welding) at the four corners of the upper end of the rectangular frame (used to guide the core mold platform 2 so that the core mold platform 2 can be accurately placed on the support frame 3. Reinforcing beams are partially fixed on the rectangular frame to ensure that the rectangular frame has sufficient strength to prevent it from plastic deformation during use and transportation, which affects the molding of composite material parts), and a plurality of lifting rings 20 are fixed on the left and right sides of the support frame 3 at equal intervals along the length direction (the lifting rings 20 are used to support the movement of the frame 3).

[0052] Furthermore, if Figure 1 As shown, the inner walls of the left and right half molds 7 and 8 are fixed with reinforcing ribs (to ensure that the left and right half molds 7 and 8 have sufficient rigidity to prevent plastic deformation during use, and the reinforcing ribs are fixed on the inner walls of the left and right half molds 7 and 8 Figure 1 not shown).

[0053] Furthermore, if Figure 1 、 Figure 11 As shown, the two pressurized cover plates 4 are composed of a cover plate 13, a spring 21 and a screw; a plurality of countersunk holes are provided on the cover plate 13, and threaded holes are provided at positions corresponding to the plurality of countersunk holes on the left half mold 7 and the right half mold 8. A screw with a spring 21 is inserted into each countersunk hole, and the screw is threadedly fastened to the corresponding threaded hole (the cover plate 13 is locked by the cooperation of the screw and the spring 21, and is used to pressurize the upper surface of the laminate during the thermal insulation process to ensure the molding quality of the composite parts after thermal insulation. The cover plate 13 is made of CNC machined aluminum plate, and the cover plate 13 is locked on the core mold with screws and springs 21, so that it has a certain clamping force, which is convenient for the molding of composite parts. The cover plate 13 is designed in sections to give it a certain rigidity to ensure that it does not deform during use).

[0054] Furthermore, if Figure 1 、 Figure 12 As shown, the composite thermal diaphragm forming tooling also includes two drilling jigs 5 (Q235-AF); these two drilling jigs 5 (made from CNC-machined steel plates) are positioned (via pins) and removably fixed (via screws) to the inner sidewalls of the left half mold 7 at both ends (for machining process holes after the integral part is formed). The multiple holes on the drilling jigs 5 serve as positioning holes and fixing holes.

[0055] Furthermore, if Figure 1 、 Figure 13 As shown, the composite material thermal diaphragm forming tooling also includes a storage box 6 (Q235-AF); the storage box 6 (welded from thin steel plates) is fixedly placed on the lower layer of the rectangular frame, and the storage box 6 is divided into multiple storage chambers (mainly used for storing and organizing detachable parts on the tooling, such as storing pins, screws, etc., to prevent loss. One accessory is placed in each storage chamber, one item at a time, and the number of detachable parts can be intuitively seen, which is convenient for counting and preventing loss).

[0056] Specific implementation method 2: Figures 1-13 As shown, this embodiment discloses a method for forming a composite material thermal diaphragm using the tooling described in the first embodiment, the method comprising the following steps:

[0057] Step 1: After moving the tooling to the designated location, clean it, apply mold release agent, and prepare it for use. Prepare the raw materials and consumables required to form the composite parts. Use the automatic tape laying machine to lay out the single-piece laminate according to the requirements of the layup drawing. Prepare the thermal insulation (the laminate must not have gaps or poor lamination during the laying process).

[0058] Step 2: Place the laminate on the core mold; before the left half mold 7 and the right half mold 8 are closed, open the right half mold 8 and move it to the designated position, and use the locking block 12 and the L-shaped locking groove 23 to lock the right half mold 8. Then, place the laid laminate on the left half mold 7 and the right half mold 8, and position the laminate with the sheet positioning block 22. Place the pressure cover plate 4 on the positioned laminate, and press the pressure cover plate 4 to the left half mold 7 and the right half mold 8 with screws and springs 21.

[0059] Step 3: Align the core mold; transport the tooling to the hot diaphragm machine to perform hot diaphragm molding on the left half mold 7 and the right half mold 8 respectively (this is the existing technology). After the hot diaphragm molding is completed, the left half mold 7 and the right half mold 8 are aligned, and positioned by the positioning block 9. After alignment, check whether the left half mold 7 and the right half mold 8 are aligned in place;

[0060] Step 4: Vacuum bag sealing: Place the laminate on the edge strip on the aligned left and right half molds 7 and 8, then place the breathable felt. Seal the left and right half molds 7 and 8 with a vacuum bag. Seal the edge of the vacuum bag and the core mold platform 2 with sealing tape. Draw a full vacuum to a minimum of 0.08 MPa. Check the vacuum bag for airtightness to ensure there is no leakage.

[0061] Step 5: High temperature molding: Place the tooling into the autoclave for molding. Perform thermal uniformity test and air tightness test according to vacuum requirements. After passing the test, proceed to the next step of high temperature molding. The high temperature molding temperature is 135-150℃, the pressure is 0.6MPa, and the temperature and pressure are kept constant for 120-180min. The vacuum negative pressure reading is tested to drop no more than 0.017MPa. After that, the temperature is lowered to room temperature. The heating and cooling rates are 1-2℃ / min.

[0062] Step 6: Complete the molding of the composite part; remove the tooling from the autoclave, remove the vacuum bag and breathable felt, and proceed to demolding. Ensure that the composite part is not damaged during the demolding process. Trim the edges of the demolded composite part. After trimming, send the composite part to a professional testing agency for testing. The test data is analyzed to conduct an overall evaluation of the composite part.

[0063] The core mold assembly 1, wherein the left half mold 7 and the right half mold 8 are respectively welded with Invar steel, heat treated after welding to eliminate stress, and then the shape is milled out by CNC machining, and then assembled and combined to complete the manufacture of the core mold assembly 1.

[0064] The core mold platform 2, in which the core mold support platform 14 is welded with Invar steel plates, is heat treated after welding to eliminate stress, and then the shape is machined by a CNC machine tool to make screw holes and pin holes, and a lifting ring 17 is installed, waiting to be assembled with the core mold assembly 1.

[0065] The supporting frame 3, in which the rectangular frame is welded with multiple square steel pipes 18, is heat treated after welding to eliminate stress, the surface is sandblasted, and then sprayed with high-temperature resistant paint, the assembly surface is processed, the threaded holes are installed, and the lifting ring 20 is installed, and the core mold platform 2 is installed on the rectangular frame.

[0066] The pressure cover plate 4 is made of material 6061-T651 and is CNC machined. The surface is then anodized with sulfuric acid and connected to the core mold with screws and springs 21.

[0067] The drilling jig 5 is made of Q235-AF steel by CNC machining, and then combined with the core mold to prepare the pin holes so that it can reach its accurate position.

[0068] The storage box 6 is welded from Q235-AF thin steel plates. After post-weld heat treatment to eliminate stress, it is fixed to the lower layer of the rectangular frame with screws. After all the tooling parts are assembled and debugged, they will be used in the next step of forming the composite material parts.

[0069] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0070] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A composite material thermal diaphragm forming tool, characterized by: The invention comprises a core mold assembly (1), a core mold platform (2), a support frame (3) and two pressure cover plates (4), wherein the core mold assembly (1) is composed of a core mold and a plurality of positioning blocks (9), and the core mold is composed of a left half mold (7) and a right half mold (8); the core mold platform (2) is located on the support frame (3), and the left half mold (7) and the right half mold (8) are arranged side by side on the core mold platform (2), and the left half mold (7) is detachably fixedly connected to the core mold platform (2). A plurality of positioning blocks (9) are provided at the lower portion between the right half mold (8), and the plurality of positioning blocks (9) are positioned and detachably fixedly connected to the left half mold (7), and the right half mold (8) is positioned by the plurality of positioning blocks (9); the core mold is locked and positioned by a plurality of locking blocks (12) of the core mold platform (2), and two pressure cover plates (4) are respectively placed on the left half mold (7) and the right half mold (8), and the two pressure cover plates (4) are detachably fastened to the left half mold (7) and the right half mold (8); The core mold platform (2) includes a core mold support platform (14), a plurality of stoppers (11), a plurality of locking blocks (12), a plurality of positioning pins (15), a plurality of positioning pins (16) and a plurality of lifting rings (17); the core mold support platform (14) is fixed on the support frame (3), a plurality of positioning pins (15) are fixed on the left side of the upper end surface of the core mold support platform (14) along the length direction, a plurality of positioning pins (16) are fixed on the right side of the upper end surface of the core mold support platform (14) along the length direction, and a plurality of locking blocks (12) are provided with long holes, and the plurality of locking blocks (12) slide It is arranged on the upper end face of the core mold support platform (14), and the long hole gap of each locking block (12) is sleeved on the corresponding positioning pin 2 (16). A plurality of L-shaped locking grooves (23) are fixed on the bottom of the outer side face of the right half mold (8) along the length direction. When the right half mold (8) is locked and positioned, the locking block (12) is matched and set in the L-shaped locking groove (23); a plurality of stoppers (11) are fixed on the right side of the upper end face of the core mold support platform (14) along the length direction, and a plurality of lifting rings (17) are fixed on the left and right sides of the upper end face of the core mold support platform (14) at equal intervals along the length direction. The support frame (3) includes a rigid top plate (10), a plurality of square steel pipes (18) and four guide blocks (19); the plurality of square steel pipes (18) are arranged horizontally and vertically and welded into a rectangular frame, the rectangular frame is divided into two layers, the rigid top plate (10) is laid on the upper layer of the rectangular frame, the rigid top plate (10) is welded to the rectangular frame, and guide blocks (19) are fixed at the four corners of the upper end of the rectangular frame, and a plurality of lifting rings (20) are fixed to the left and right sides of the support frame (3) at equal intervals along the length direction.

2. A composite material thermal insulation film forming tool according to claim 1, characterized in that: Two sheet positioning blocks (22) are fixed correspondingly to the front and rear ends of the upper end faces of the left half mold (7) and the right half mold (8).

3. The composite material thermal insulation film forming tool according to claim 2, characterized in that: A plurality of positioning grooves are provided on the right half mold (8) at positions corresponding to the plurality of positioning blocks (9), and each positioning block (9) is matched and arranged in the corresponding positioning groove.

4. The composite material thermal insulation film forming tool according to claim 2, characterized in that: Reinforcing ribs are fixed on the inner walls of the left half mold (7) and the right half mold (8).

5. The composite material thermal insulation film forming tool according to claim 2, characterized in that: The two pressure cover plates (4) are composed of a cover plate (13), a spring (21) and a screw; a plurality of countersunk holes are provided on the cover plate (13); threaded holes are provided at positions corresponding to the plurality of countersunk holes on the left half mold (7) and the right half mold (8); a screw with a spring (21) is inserted into each countersunk hole, and the screw is threadedly fastened to the corresponding threaded hole.

6. The composite material thermal insulation film forming tool according to claim 2, characterized in that: The composite material thermal diaphragm forming tool further comprises two drilling jigs (5); the two drilling jigs (5) are positioned with the inner side walls at both ends of the left half mold (7) and are detachably fixedly connected.

7. The composite material thermal insulation film forming tool according to claim 1, characterized in that: The composite material thermal diaphragm forming tool further comprises a storage box (6); the storage box (6) is fixedly placed on the lower layer of the rectangular frame, and the storage box (6) is divided into a plurality of storage chambers.

8. A method for forming a composite material thermal diaphragm using the tooling according to any one of claims 2 to 7, characterized in that: The method comprises the following steps: Step 1: Preparation before hot diaphragm: clean the tooling and apply release agent to prepare the tooling for use; then, lay the single laminate; Step 2: Place the laminate on the core mold; before the left half mold (7) and the right half mold (8) are aligned, open the right half mold (8), and lock the right half mold (8) with the locking block (12) and the L-shaped locking groove (23), then place the laid laminate on the left half mold (7) and the right half mold (8), position the laminate by the sheet positioning block (22), and place the pressure cover plate (4) on the positioned laminate, and press the pressure cover plate (4) and the left half mold (7) and the right half mold (8) with screws and springs (21); Step 3: aligning the core mold; transporting the tooling to the hot diaphragm machine to perform hot diaphragm molding on the left half mold (7) and the right half mold (8), respectively. After the hot diaphragm molding is completed, align the left half mold (7) and the right half mold (8), and position them by the positioning block (9). After aligning, check whether the left half mold (7) and the right half mold (8) are aligned in place; Step 4: vacuum bag sealing; place the laminate on the edge strip on the left half mold (7) and the right half mold (8) that are in place, then place the breathable felt, seal the left half mold (7) and the right half mold (8) with a vacuum bag, seal the edge of the vacuum bag and the core mold platform (2) with a sealing tape, and draw a full vacuum of at least 0.08MPa. Check the airtightness of the vacuum bag to ensure there is no leakage; Step 5: High temperature molding: Place the tooling into the autoclave for molding. Perform thermal uniformity test and air tightness test according to vacuum requirements. After passing the test, proceed to the next step of high temperature molding. The high temperature molding temperature is 135-150℃, the pressure is 0.6MPa, and the temperature and pressure are kept constant for 120-180min. The vacuum negative pressure reading is tested to drop no more than 0.017MPa. After that, the temperature is lowered to room temperature. The heating and cooling rates are 1-2℃ / min. Step 6: Complete the molding of the composite molded parts; move the tooling out of the autoclave, remove the vacuum bag and breathable felt, and perform demolding. During the demolding process, it must be ensured that no damage is caused to the composite molded parts. After demolding, clean and trim the edges of the composite molded parts.

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