Integral Compression Molding Method for a Large-Size Thin-Walled Multifunctional Special-Shaped Thermal Protection Component

Abstract

The present invention relates to the technical field of thermal protection components, and particularly relates to an integral molding method for a large-size thin-walled special-shaped thermal protection component, which includes bisecting the special-shaped thermal protection component along the thickness direction; dividing the inner cylinder into an upper inner cylinder and a lower inner cylinder by a horizontal plane at a distance of 1 / 3 of the cylinder height from the top of the cylinder, and dividing the outer cylinder into an upper outer cylinder and a lower outer cylinder by a horizontal plane at a distance of 2 / 3 of the cylinder height from the top of the cylinder; equally dividing the upper inner cylinder, the lower inner cylinder, the upper outer cylinder and the lower outer cylinder by a vertical plane that simultaneously passes through the axis of the cylinder and passes out between every two adjacent substrates to obtain a plurality of thermal protection component sub-bodies; respectively calculating the weights of the premixes required for each thermal protection component sub-body; laying the premixes in a pre-laying mold, preheating and pre-compacting to obtain prefabricated thermal protection component sub-bodies; placing each prefabricated thermal protection component sub-body in a thermal protection component mold, closing the mold, raising the temperature, applying pressure, curing, demolding and machining to obtain a special-shaped thermal protection component.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal protection components, and particularly relates to a method for integrally molding a large-size thin-wall multi-functional special-shaped thermal protection component by die pressing. Background Art

[0002] For resin matrix composites, the die pressing process is one of the traditional and mature processes. The products prepared by this process have isotropic properties and good mass uniformity. However, the products prepared by the die pressing process are restricted by the die structure and equipment conditions such as hydraulic presses. The product structure and surface profile are simple, and generally the product size is small.

[0003] The operating conditions of special-shaped thermal protection components are extremely harsh. When they re-enter the atmosphere, the speed can reach 20-25 times the speed of sound, the stagnation temperature can be as high as 8000-10000 °C, the surface temperature of the cone is 3000-3500 °C, and the stagnation pressure can reach 10 MPa. The harsh re-entry thermal environment directly affects the safety of special-shaped thermal protection components. Therefore, the stability of the performance of special-shaped thermal protection components is crucial. The function of special-shaped thermal protection components is not only to ensure the integrity of their own structure and avoid being burned in the re-entry environment, but also to ensure that the devices inside them are within the designed temperature range to prevent the effective payload from being affected due to excessive heat transfer.

[0004] The external shape structure of the special-shaped thermal protection component is complex. The special-shaped thermal protection component prepared by the existing forming method includes components such as a cylinder section, a fairing, a rudder base plate, screws, nuts, etc. The cylinder section is prepared by a tape winding process, and the fairing, rudder base plate, screws, and nuts are prepared by a molding process. The rudder base plate and the cylinder section are fixedly connected by bonding and screwing with screws and nuts. The preparation of the cylinder section includes the following steps: the ablation-resistant fabric is impregnated, dried, and pre-cured with an ablation-resistant resin, cut into strips of the required width, and wound into a blank on a special mold. The ablation-absorbing material and rubber sleeve are wrapped and placed in an autoclave for pressurization and temperature rise for curing. After taking out of the autoclave, it is machined to the required size. The preparation of the fairing and the rudder base plate includes the following steps: the ablation-resistant fibers are cut into the required length (the fibers of the rudder base plate need to be cut a little longer to improve the strength of the rudder base plate), mixed with an ablation-resistant resin preparation in a certain proportion, dried and pre-cured to make a premix. The quantitative premix is loaded into the special high-precision molds of the fairing, rudder base plate, screws, and nuts, cured by heating and pressurization, demolded, and machined to the dimensional accuracy required by the product. The overall preparation of the special-shaped thermal protection component includes the following steps: first, determine the position of the rudder base plate and the position of screw fixation on the cylinder section. The cylinder section is machined and flattened according to the size of the rudder base plate, and holes for passing screws are drilled on the cylinder section and the rudder base plate. There are six sets of screws and nuts for each rudder base plate. Secondly, place the cylinder section on a special tooling, and bond the four rudder base plates one by one by screwing and bonding. Finally, after the glue is cured, remove the tooling and clean the residual glue, etc. This forming method not only has many processes, poor quality consistency, poor stability, high production cost, and long production cycle, but also can only meet the working conditions with a relatively mild ablation environment. In the harsh working conditions where the heat generated by the friction with the air increases sharply when re-entering the atmosphere, if this scheme is still adopted, not only will the bonding glue fail at high temperature, but the screws and nuts will also be damaged by the heat flow erosion at higher temperatures and higher speeds.

[0005] Therefore, in view of the above problems, the present invention urgently provides an integral molding method for a large-size thin-walled multi-functional special-shaped thermal protection component. Summary of the Invention

[0006] The technical problem solved by the present invention is to provide an integral molding method for a large-size thin-walled multi-functional special-shaped thermal protection component. By accurately partitioning, preheating, and pre-compacting the special-shaped thermal protection component, and then laying each prefabricated part in a mold for re-molding, it not only solves the problems of thin-walled structure and narrow loading cavity, but also makes the thickness of the prepared special-shaped thermal protection component uniform, with excellent mechanical properties and ablation resistance, meeting the working condition use requirements of the special-shaped thermal protection component.

[0007] The present invention provides an integral molding method for a large-sized thin-walled multi-functional special-shaped thermal protection component. The special-shaped thermal protection component includes a cylindrical body arranged in an inverted conical shape. A plurality of substrate plates are evenly spaced on the outer surface of the cylindrical body. A curved surface boss in an inverted trapezoidal shape is provided at the bottom of each substrate plate. The molding method includes the following steps:

[0008] 1) Establish a model of the special-shaped thermal protection component, and extend machining allowances outward at the upper and lower ends of the special-shaped thermal protection component model; bisect the special-shaped thermal protection component with machining allowances along the thickness direction of the cylindrical body to obtain an inner cylinder and an outer cylinder; divide the inner cylinder into an upper inner cylinder and a lower inner cylinder with a horizontal plane at a distance of 1 / 3 of the height of the cylindrical body from the top of the cylindrical body, and divide the outer cylinder into an upper outer cylinder and a lower outer cylinder with a horizontal plane at a distance of 2 / 3 of the height of the cylindrical body from the top of the cylindrical body; divide the upper inner cylinder, the lower inner cylinder, the upper outer cylinder and the lower outer cylinder equally with a vertical plane passing through the axis of the cylindrical body and passing out between every two adjacent substrate plates; divide the thermal protection component into a plurality of thermal protection component sub-bodies. The thermal protection component sub-bodies include a plurality of upper inner cylinder sub-bodies, a plurality of lower inner cylinder sub-bodies, a plurality of upper outer cylinder sub-bodies, a plurality of lower outer cylinder sub-bodies, a plurality of substrate plates and a plurality of curved surface bosses; calculate the weight of the prepreg required for each thermal protection component sub-body respectively;

[0009] 2) Mix resin, fiber and wave-absorbing material to obtain prepreg; accurately weigh the prepreg required for each thermal protection component sub-body, and lay the prepreg in a pre-laying mold according to the shape of different thermal protection component sub-bodies respectively, and preheat and pre-compact to obtain a preform of the thermal protection component sub-body;

[0010] 3) Place the preforms of each thermal protection component sub-body in a thermal protection component mold according to the shape of the special-shaped thermal protection component. After clamping the mold, heating, pressurizing, curing and demolding, obtain a preform of the special-shaped thermal protection component;

[0011] 4) Perform machining on the preform of the special-shaped thermal protection component to remove the machining allowance and obtain the special-shaped thermal protection component.

[0012] Preferably, the ratio of resin, fiber and wave-absorbing material is 45 - 55:55 - 45:1.

[0013] Preferably, the fiber is one of carbon fiber, high silica fiber, glass fiber and quartz fiber, and the resin is one of aminophenolic aldehyde, magnesium phenolic aldehyde, boron phenolic aldehyde and benzoxazine.

[0014] Preferably, in step 2), the pre-pressing pressure F of each thermal protection component sub-body 预 satisfies the following formula: F 预 = kF 成型 where F 成型$p$ is the forming pressure of the special-shaped thermal protection component, $k$ is the pre-pressing coefficient of the split thermal protection component, which is 5 - 15%; the preheating temperature of each split thermal protection component is determined according to the dynamic curing curve of the resin in the premix, and is 60 - 100 °C.

[0015] Preferably, in step 1), the machining allowance includes a first extended area extending along the generatrix from the large end of the cylinder and a circular ring-shaped second extended area connected to the small end of the cylinder.

[0016] Preferably, the length of the first extended area is 100 - 200 mm, and the second extended area is a circular ring with a thickness of 10 - 20 mm and a width of 50 - 150 mm.

[0017] Preferably, in step 2), after laying the lower outer cylinder split and the upper outer cylinder split, when laying the upper inner cylinder split and the lower inner cylinder split, the upper inner cylinder split and the lower inner cylinder split are rotated by a certain angle along the axis of the cylinder and then laid.

[0018] Preferably, the inner diameter of the large end of the cylinder is 853.9 mm, and the inner diameter of the small end is 600 mm; the height of the cylinder is 500 - 1000 mm, and the semi-cone angle is 5 - 15°.

[0019] Preferably, the thickness of the substrate is 15 mm, and the distance between the highest point of the curved surface convex platform and the highest point of the substrate is 30 mm.

[0020] Preferably, the wall thickness of the cylinder is 10 - 12 mm.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention provides a method for integral molding of a large-size thin-walled multi-functional special-shaped thermal protection component. The thermal protection component is divided into multiple parts, and then the weight of the required premix is accurately calculated according to each part. It is preheated and pre-compacted in a pre-laying mold, and then the preform is laid in a forming mold, the mold is closed and pressurized and then cured, and the cylinder, the substrate and the curved surface convex platform are integrally molded at one time. This not only eliminates the need for screws and nuts, but also does not require multiple processes and multiple procedures such as separate molding, machining, and reassembly of each component. Moreover, it eliminates various hidden dangers such as the high-temperature failure of the adhesive and the reduction of mechanical properties by machining, improves the overall performance, and accurately strikes the target; by accurately dividing the forming premix and then forming, the present invention not only solves the problems of thin-walled structure and narrow loading cavity, but also makes the thickness of the obtained special-shaped thermal protection component uniform, with excellent mechanical properties and ablation resistance, meeting the working condition requirements of the special-shaped thermal protection component; and the present invention divides the inner cylinder and the outer cylinder along the horizontal plane at different heights, increasing the bonding surface between different split thermal protection components, making the combination of each split thermal protection component tight and avoiding phenomena such as delamination during the use of the thermal protection component. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural view (front view) of the large-sized thin-walled multi-functional special-shaped thermal protection component according to an embodiment of the present invention;

[0024] Figure 2 is an operation flow chart of the integral compression molding method for the large-sized thin-walled multi-functional special-shaped thermal protection component.

[0025] Wherein: 1. Cylinder body; 2. Substrate; 3. Curved surface boss. Specific embodiments

[0026] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0027] As Figure 1 、 Figure 2 shown, this embodiment provides an integral compression molding method for a large-sized thin-walled multi-functional special-shaped thermal protection component. The special-shaped thermal protection component includes a cylinder body 1 arranged in an inverted conical shape. A plurality of substrates 2 are evenly spaced on the outer surface of the cylinder body 1. A curved surface boss 3 in an inverted trapezoidal shape is provided at the bottom of each substrate 2. The molding method includes the following steps:

[0028] 1) Establish a model of the special-shaped thermal protection component, and extend machining allowances outward at the upper and lower ends of the special-shaped thermal protection component model; bisect the special-shaped thermal protection component with machining allowances along the thickness direction of the cylinder body 1 to obtain an inner cylinder and an outer cylinder; divide the inner cylinder into an upper inner cylinder and a lower inner cylinder with a horizontal plane at a distance of 1 / 3 of the height of the cylinder body 1 from the top of the cylinder body 1, and divide the outer cylinder into an upper outer cylinder and a lower outer cylinder with a horizontal plane at a distance of 2 / 3 of the height of the cylinder body 1 from the top of the cylinder body 1; equally divide the upper inner cylinder, the lower inner cylinder, the upper outer cylinder and the lower outer cylinder with a vertical plane passing through the axis of the cylinder body 1 and passing out between every two adjacent substrates 2; divide the thermal protection component into multiple thermal protection component sub-bodies. The thermal protection component sub-bodies include multiple upper inner cylinder sub-bodies, multiple lower inner cylinder sub-bodies, multiple upper outer cylinder sub-bodies, multiple lower outer cylinder sub-bodies, multiple substrates 2 and multiple curved surface bosses 3; calculate the weights of the prepregs required for each thermal protection component sub-body respectively;

[0029] 2) Mix resin, fiber and wave-absorbing material to obtain prepreg; accurately weigh the prepregs required for each thermal protection component sub-body, and lay the prepregs in a pre-laying mold according to the shapes of different thermal protection component sub-bodies respectively, and preheat and pre-compact to obtain prefabricated parts of the thermal protection component sub-bodies;

[0030] 3) Place the prefabricated parts of each thermal protection component in the thermal protection component mold according to the shape of the special-shaped thermal protection component. After closing the mold, heating, pressurizing, curing, and demolding, a prefabricated part of the special-shaped thermal protection component is obtained;

[0031] 4) Machine the prefabricated part of the special-shaped thermal protection component to remove the machining allowance, and a special-shaped thermal protection component is obtained.

[0032] The present invention provides a method for integrally molding a large-size thin-walled multi-functional special-shaped thermal protection component. The thermal protection component is divided into multiple parts, and then the weight of the required premix is accurately calculated according to each part. It is preheated and pre-compacted in a pre-laying mold, and then the prefabricated part is laid in the molding mold. After closing the mold and applying pressure and then curing, the cylinder 1, the substrate 2 and the curved boss 3 are integrally molded at one time. This not only eliminates the need for screws and nuts, but also does not require multiple processes and multiple procedures such as separately molding, machining, and reassembling of each component. Moreover, it eliminates various hidden dangers such as the high-temperature failure of the adhesive and the reduction of mechanical properties by machining, improves the overall performance, and accurately strikes the target. By accurately forming the premix in zones and then molding, the present invention not only solves the problems of thin-walled structure and narrow loading cavity, but also makes the obtained special-shaped thermal protection component have a uniform thickness, excellent mechanical properties and ablation resistance, meeting the working condition requirements of the special-shaped thermal protection component. And the present invention divides the inner cylinder and the outer cylinder along the horizontal plane at different heights, increasing the joint surface between different prefabricated parts of the thermal protection component, making the combination of each prefabricated part of the thermal protection component tight, and avoiding phenomena such as delamination during the use of the thermal protection component.

[0033] In this embodiment, the ratio of resin, fiber and wave-absorbing material is 45-55:55-45:1.

[0034] In this embodiment, the fiber is one of carbon fiber, high silica fiber, glass fiber, and quartz fiber, and the resin is one of aminophenolic aldehyde, magnesium phenolic aldehyde, boron phenolic aldehyde, and benzoxazine.

[0035] In this embodiment, in step 2), the pre-pressing pressure F of each prefabricated part of the thermal protection component 预 satisfies the following formula: F 预 =kF 成型 , where F 成型 is the molding pressure of the special-shaped thermal protection component, k is the pre-pressing coefficient of the prefabricated part of the thermal protection component, which is 5-15%; the preheating temperature of each prefabricated part of the thermal protection component is determined according to the dynamic curing curve of the resin in the premix, and is 60-100 °C.

[0036] In this embodiment, in step 1), the machining allowance includes a first extended area extending along the generatrix direction from the large end of the cylinder 1 and a circular second extended area connected to the small end of the cylinder.

[0037] In this embodiment, the length of the first extended region is 100 - 200 mm, and the second extended region is an annular ring with a thickness of 10 - 20 mm and a width of 50 - 150 mm.

[0038] In this embodiment, in step 2), after laying the lower outer cylinder split body and the upper outer cylinder split body, when laying the upper inner cylinder split body and the lower inner cylinder split body, the upper inner cylinder split body and the lower inner cylinder split body are laid after being rotated by a certain angle along the axis of the cylinder body 1.

[0039] In this embodiment, the inner diameter of the large end of the cylinder body 1 is 853.9 mm, and the inner diameter of the small end is 600 mm; the height of the cylinder body 1 is 500 - 1000 mm, and the semi-cone angle is 5 - 15°.

[0040] In this embodiment, the thickness of the substrate 2 is 15 mm, and the distance between the highest point of the curved surface convex platform 3 and the highest point of the substrate 2 is 30 mm.

[0041] In this embodiment, the wall thickness of the cylinder body 1 is 10 - 12 mm.

[0042] The present invention also provides an embodiment, wherein the inner diameter of the small end of the cylinder body 1 of the large-size thin-wall multi-functional special-shaped thermal protection member is 600 mm, the inner diameter of the large end is 853.9 mm, the height of the cylinder body 1 is 720 mm, the semi-cone angle is 10°, the wall thickness of the small end is 12 mm, and the wall thickness of the large end is 10 mm; the width of the substrate 2 is 180 mm, and the thickness is 15 mm; the distance between the highest point of the curved surface convex platform 3 and the highest point of the substrate 2 is 30 mm;

[0043] Its forming method comprises the following steps:

[0044] 1) Establish a special-shaped thermal protection member model, and extend machining allowances outward at the upper and lower ends of the special-shaped thermal protection member model; divide the special-shaped thermal protection member with machining allowances into two equal parts along the thickness direction of the cylinder body 1 to obtain an inner cylinder and an outer cylinder; divide the inner cylinder into an upper inner cylinder and a lower inner cylinder with a horizontal plane at a distance of 1 / 3 of the height of the cylinder body 1 from the top of the cylinder body 1, and divide the outer cylinder into an upper outer cylinder and a lower outer cylinder with a horizontal plane at a distance of 2 / 3 of the height of the cylinder body 1 from the top of the cylinder body 1; divide the upper inner cylinder, the lower inner cylinder, the upper outer cylinder and the lower outer cylinder into equal parts with a vertical plane that simultaneously passes through the axis of the cylinder body 1 and passes through between every two adjacent substrates 2; divide the thermal protection member into multiple thermal protection member split bodies, and the thermal protection member split body includes multiple upper inner cylinder split bodies, multiple lower inner cylinder split bodies, multiple upper outer cylinder split bodies, multiple lower outer cylinder split bodies, multiple substrates 2 and multiple curved surface convex platforms 3; calculate the weight of the premix required for each thermal protection member split body respectively;

[0045] It is calculated that the weight of the premix required for each of the 4 upper inner cylinders is 1479 g, the weight required for each of the 4 lower inner cylinders is 3295 g, the weight of the premix required for each of the 4 upper outer cylinders is 2882 g, and the weight of the premix required for each of the 4 lower outer cylinders is 1778 g;

[0046] 2) Mix the resin, fiber and wave-absorbing material to obtain the premix; accurately weigh the premix required for each heat protection component body, and lay the premix in the pre-laying mold according to the shape of different heat protection component bodies respectively, preheat and pre-compact to obtain the preform of the heat protection component body;

[0047] The fiber is selected as high-silica fiber, and the resin is selected as the resin system of magnesium phenolic resin added with wave-absorbing stealth material; the preheating temperature is selected as 80 °C, and the preforming pressure F 预 = kF 成型 where k is selected as 10%, then F 预 = 10% * F 成型 ;

[0048] Among them, for the lower outer cylinder, accurately weigh the premix required for the curved surface boss 3 part, fill the premix into the curved surface boss 3 part of the pre-laying mold, after pre-compaction, then lay the premix for the remaining part of the lower outer cylinder, preheat and pre-compact to obtain the preform of the lower outer cylinder;

[0049] It is calculated that inside the lower outer cylinder, the weight of the premix required for each curved surface boss 3 is 180 g, and the weight of the premix required for each substrate 2 is 1947 g; the laying sequence of each lower outer cylinder is: the first step is to lay each curved surface boss 3, the second step is to lay each substrate 2, the third step is to lay each lower outer cylinder body, the fourth step is to lay each upper outer cylinder body, the fifth step is to lay each lower inner cylinder body, and the sixth step is to lay each upper inner cylinder body; when laying each upper inner cylinder body and each lower inner cylinder body, rotate each upper inner cylinder body and each lower inner cylinder body by a certain angle along the axis of the cylinder 1 and then lay, generally, it can be rotated clockwise by 10° - 20°;

[0050] 3) Place the preforms of each heat protection component body in the heat protection component mold according to the shape of the special-shaped heat protection component, close the mold, heat up to 100 - 110 °C, raise the forming pressure to 20 - 30 MPa, then heat up to 165 - 180 °C at a speed of 2 - 5 °C / 10 min, keep warm for 3 h, naturally cool down to below 60 °C and then demold to obtain the preform of the special-shaped heat protection component;

[0051] 4) Machine-process the preform of the special-shaped heat protection component to remove the machining allowance and obtain the special-shaped heat protection component.

[0052] After testing, the performance of the special-shaped heat protection component prepared by the present invention is shown in Table 1:

[0053] Table 1: Performance table of special-shaped heat protection component

[0054]

[0055] Obviously, the above embodiments are merely examples given for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or alterations can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. And the obvious changes or alterations derived therefrom still fall within the protection scope of the present invention.

Claims

1. A method for integrally molding a large-sized, thin-walled, multifunctional, special-shaped heat protection component, the special-shaped heat protection component comprising a cylinder (1) arranged in an inverted cone shape, a plurality of base plates (2) being evenly spaced on the outer surface of the cylinder (1), and a bottom of each base plate (2) being provided with an inverted trapezoidal curved boss (3), characterized in that: The molding method comprises the following steps: 1) establishing a model of a special-shaped heat protection component, and extending machining allowances outwards at the upper and lower ends of the special-shaped heat protection component model; dividing the special-shaped heat protection component with the machining allowances in half along the thickness direction of the cylinder (1) to obtain an inner cylinder and an outer cylinder; dividing the inner cylinder into an upper inner cylinder and a lower inner cylinder by a horizontal plane whose distance from the top of the cylinder (1) is 1 / 3 of the height of the cylinder (1); dividing the outer cylinder into an upper outer cylinder and a lower outer cylinder by a horizontal plane whose distance from the top of the cylinder (1) is 2 / 3 of the height of the cylinder (1); dividing the upper inner cylinder, the lower inner cylinder, the upper outer cylinder and the lower outer cylinder into equal parts by a vertical plane which simultaneously passes through the axis of the cylinder (1) and passes through between every two adjacent base plates (2); Dividing the heat protection component into a plurality of heat protection component parts, the heat protection component parts comprising a plurality of upper inner cylinder parts, a plurality of lower inner cylinder parts, a plurality of upper outer cylinder parts, a plurality of lower outer cylinder parts, a plurality of base plates (2) and a plurality of curved bosses (3); Calculate the weight of the premix required for each heat protection component separately; 2) Mixing resin, fiber and absorbing material to obtain a premix; accurately weighing the premix required for each thermal protection component segment, laying the premix in a pre-laying mold according to the shape of different thermal protection component segments, preheating and pre-compacting, and obtaining thermal protection component segment prefabricated parts; 3) placing each heat protection component separate prefabricated part in the heat protection component mold according to the shape of the special-shaped heat protection component, closing the mold, heating, pressurizing, curing, and demoulding to obtain the special-shaped heat protection component prefabricated part; 4) Mechanically process the prefabricated special-shaped heat protection component to remove the machining allowance and obtain the special-shaped heat protection component.

2. The integral compression molding method of a large-size, thin-walled, multifunctional, special-shaped heat protection component according to claim 1, characterized in that: The ratio of resin, fiber and absorbing material is 45-55:55-45:

1.

3. The integral compression molding method of a large-size, thin-walled, multifunctional, special-shaped heat protection component according to claim 2, characterized in that: The fiber is one of carbon fiber, high silica fiber, glass fiber and quartz fiber, and the resin is one of aminophenol aldehyde, magnesium phenol aldehyde, boron phenol aldehyde and benzoxazine.

4. The integral compression molding method of a large-size, thin-walled, multifunctional, special-shaped heat protection component according to claim 3 is characterized in that: In step 2), the pre-compression pressure F of each heat protection component is 预 Satisfies the following formula: F 预 =kF 成型 , where F 成型 is the molding pressure of the special-shaped heat protection component, k is the pre-compression coefficient of the heat protection component split, which is 5-15%; the preheating temperature of each heat protection component split is determined according to the dynamic curing curve of the resin in the premix, which is 60-100°C.

5. The integral compression molding method of a large-sized, thin-walled, multifunctional, special-shaped heat protection component according to claim 4, characterized in that: In step 1), the machining allowance includes a first extension area extending from the large end of the cylinder (1) along the generatrix direction and a circular second extension area connected to the small end of the cylinder.

6. The integral compression molding method of a large-sized, thin-walled, multifunctional, special-shaped heat protection component according to claim 5, characterized in that: The length of the first extension zone is 100-200 mm, and the second extension zone is a circular ring with a thickness of 10-20 mm and a width of 50-150 mm.

7. The integral compression molding method of a large-sized, thin-walled, multifunctional, special-shaped heat protection component according to claim 6, characterized in that: In step 3), after laying out the lower outer cylinder split prefabricated part and the upper outer cylinder split prefabricated part, when laying out the upper inner cylinder split prefabricated part and the lower inner cylinder split prefabricated part, the upper inner cylinder split prefabricated part and the lower inner cylinder split prefabricated part are rotated along the axis of the cylinder (1) by a certain angle before laying out.

8. The integral compression molding method of a large-sized, thin-walled, multifunctional, special-shaped heat protection component according to claim 7, characterized in that: The inner diameter of the large end of the cylinder (1) is 853.9 mm, and the inner diameter of the small end is 600 mm; the height of the cylinder (1) is 500-1000 mm, and the semi-cone angle is 5-15°.

9. The integral compression molding method of a large-sized, thin-walled, multifunctional, special-shaped heat protection component according to claim 8, characterized in that: The thickness of the substrate (2) is 15 mm, and the distance between the highest point of the curved boss (3) and the highest point of the substrate (2) is 30 mm.

10. The integral compression molding method of a large-size, thin-walled, multifunctional, special-shaped heat protection component according to claim 9, characterized in that: The wall thickness of the cylinder (1) is 10-12 mm.

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