Ceramic matrix composite optical machine lens cone and forming die and forming method thereof

Abstract

The invention discloses a ceramic matrix composite optical machine lens cone and a forming mold and a forming method thereof, belongs to the technical field of satellite optical machine lens cones, and solves the problems that in the prior art, a metal lens cone is prone to deformation after being heated, and light weight cannot be achieved. Two flanges are arranged at the two ends of the barrel respectively, and vertical ribs are arranged on the outer surface of the barrel. The optical machine lens cone made of the ceramic-based composite material has the characteristics of high hardness, high strength and high temperature resistance; the weight is light, and the stability of an optical instrument is greatly improved; the vertical ribs are arranged on the outer side of the barrel body, so that the overall non-deformability of the lens barrel is improved; according to the ceramic matrix composite optical machine lens cone forming method, an integral forming process is adopted, each component does not need to be independently formed and then assembled, the forming process is simplified, and the forming efficiency is improved; in the forming process, interface layer preparation and silicon carbide matrix preparation are carried out on the whole lens cone preform, and the ceramic matrix composite material lens cone with high density is obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of satellite optical-mechanical lens barrels, and in particular to a ceramic-based composite material optical-mechanical lens barrel and a molding die and molding method thereof. Background Art

[0002] The satellite optical-mechanical lens barrel is a cylindrical structure used to install and support the optical system on the satellite. Its main function is to protect the optical system from interference from the external environment, while ensuring the stability and accuracy of the optical system. The support barrel in the satellite optical-mechanical lens barrel mainly supports and fixes the optical elements. Traditional optical support barrels are usually made of metal materials, but metal materials have problems such as heavy weight, high thermal expansion coefficient, and easy deformation. Therefore, the support barrel made of metal materials is easily deformed when heated and cannot be lightweight.

[0003] Ceramic Matrix Composites (CMCs) is a new type of material. Due to its advantages such as high hardness, high thermal conductivity, and high chemical stability, it has been widely used in aerospace, automotive, and medical fields. Therefore, the lens barrel support tube made of ceramic matrix composite materials is a new type of optical component, which is widely used in lasers, optical communications, optical measurement, and other fields. Although the lens barrel support tube made of ceramic matrix composite materials has the advantages of low thermal expansion coefficient and high hardness, it is difficult to process and has a complex molding process. The existing ceramic matrix composite lens barrel support tube is mainly prepared by split molding to prepare each component, and then the components are assembled after preparation. The molding steps are cumbersome and the molding process is complex.

[0004] Therefore, the present invention provides a lens barrel of a ceramic-based composite material and a method for integrally forming the lens barrel. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a ceramic-based composite optical machine lens barrel and its forming mold and forming method, which solve the problem that the metal lens barrel in the prior art is easily deformed when heated and cannot be lightweight.

[0006] In the first aspect, in order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is:

[0007] A ceramic-based composite optical machine lens barrel comprises a barrel body. Two flanges are respectively arranged at both ends of the barrel body, and vertical ribs are arranged on the outer surface of the barrel body.

[0008] In this scheme, the optical machine lens barrel made of ceramic-based composite materials has the characteristics of high hardness, high strength and high temperature resistance; it is also light in weight, which greatly improves the stability of the optical instrument; vertical ribs are arranged on the outside of the barrel to improve the overall deformation resistance of the lens barrel.

[0009] In the second aspect, the present invention provides a molding mold for a ceramic-based composite material optical-mechanical lens barrel based on a ceramic-based composite material optical-mechanical lens barrel provided in the first aspect, specifically comprising an inner mold assembly, a box-type mold assembly is arranged outside the inner mold assembly, and a reinforcement ring is fixed outside the box-type mold assembly; flange mold assemblies are arranged at both ends of the inner mold assembly.

[0010] In this solution, the cavity between the inner mold assembly and the box-type mold assembly is used for forming the barrel and the vertical ribs, and the cavity between the flange mold assembly and the box-type mold assembly is used for forming the flange. This design can realize the one-piece forming of the lens barrel. After forming, the overall connection strength of the lens barrel is high, and it is also convenient for the later preparation of the silicon carbide matrix of the entire lens barrel.

[0011] Furthermore, the inner mold assembly includes four inner mold plates, each of which is an arc-shaped plate with a quarter arc; the four arc-shaped plates form a circular cylinder;

[0012] The flange mold assembly comprises an upper flange mold and a lower flange mold; the upper flange mold and the lower flange mold are respectively fixed on two ends of the circular cylinder through a cover plate assembly.

[0013] Furthermore, the cover plate assembly includes four cover plates, and the four cover plates form a circular ring, the outer side of the circular ring is fixed on the box-shaped mold assembly, and the inner side of the circular ring presses the upper flange mold or the lower flange mold.

[0014] Furthermore, the box-shaped mold assembly includes a plurality of box-shaped molds, and the plurality of box-shaped molds are arranged on the outer surface of the circular cylinder and fixed by a plurality of reinforcement rings.

[0015] In a third aspect, the present invention provides a method for forming a ceramic-based composite material optical-mechanical lens barrel based on the ceramic-based composite material optical-mechanical lens barrel provided in the first aspect, comprising the following steps:

[0016] S1: preparing a lens barrel preform;

[0017] S2: preparing an interface layer on the lens barrel preform by using a chemical vapor deposition process;

[0018] S3: preparing a silicon carbide substrate for the lens barrel preform by using a chemical vapor deposition process;

[0019] S4: machining the lens barrel preform;

[0020] S5: Prepare a silicon carbide matrix on the lens barrel preform by using a reactive melt infiltration process.

[0021] In this scheme, a lens barrel preform is first prepared, and then the interface layer and the silicon carbide matrix are prepared for the entire lens barrel preform, so as to obtain an integrated ceramic-based composite optical-mechanical lens barrel; this molding method has a simple process, omits the parts assembly step compared to the existing split structure combination assembly process, and simplifies the process; and the molding cycle is short and the preparation efficiency is high.

[0022] Furthermore, S1 includes:

[0023] S101: forming a cylinder preform; winding a carbon cloth on an inner mold assembly, and sewing and fixing the cylinder preform with carbon fiber to obtain the cylinder preform; performing right-angle flanging on both ends of the cylinder preform to form two flange edges for connecting with the flange preform;

[0024] S102: forming a flange preform; laying carbon cloth on the end surfaces of two flange edges, and sewing and fixing with carbon fiber after laying to prepare a flange preform;

[0025] S103: forming a rib preform; cutting out a rectangular carbon cloth, and performing right-angle flanging on the four sides of the rectangular carbon cloth to obtain a box-shaped part, and cutting the carbon cloth in the area of ​​the weight-reducing hole at the bottom of the box-shaped part; fixing the box-shaped part with the weight-reducing hole cut out on the outer surface of the barrel preform, and fixing the flanging of two adjacent box-shaped parts by sewing carbon fibers to obtain a lens barrel preform;

[0026] S104: Installing a molding mold; placing a corresponding box-shaped mold inside each box-shaped part, and installing a reinforcement ring outside the box-shaped mold for fixing;

[0027] An upper flange mold and a lower flange mold are respectively installed on both sides of the two flange preforms, and a cover plate assembly is installed to fix the upper flange mold and the lower flange mold.

[0028] In this scheme, carbon cloth is used to wrap a cylinder preform, and the two ends of the cylinder preform are flanged to form two flange edges, and carbon cloth is laid on the two flange edges to form a flange preform; in this way, the contact area between the cylinder preform and the flange preform is large, and the connection strength between the two is high after the silicon carbide matrix is ​​prepared later, and the obtained lens barrel structure is more solid.

[0029] Furthermore, S2 includes:

[0030] S201: First interface layer preparation: placing the lens barrel preform together with the forming mold into a CVI deposition furnace for chemical vapor deposition to prepare an interface layer;

[0031] S202: preparing the interface layer for the second time; removing the forming mold on the lens barrel preform, placing the lens barrel preform alone into a CVI deposition furnace for chemical vapor deposition, and preparing the interface layer again;

[0032] S203: high temperature treatment; after the interface layer is deposited, the forming mold is reinstalled on the lens barrel preform, and the lens barrel preform and the forming mold are subjected to high temperature treatment.

[0033] In this scheme, the interface layer is prepared twice for the lens barrel preform with the molding mold installed and with the molding mold removed. The first interface layer preparation can shape it in the molding mold, and the second interface layer preparation after removing the molding mold can ensure that the interface layer can be evenly deposited on the entire surface of the lens barrel preform.

[0034] Furthermore, S3 includes:

[0035] S301: First round of silicon carbide substrate preparation: placing the high-temperature treated lens barrel preform and the forming mold into a CVI deposition furnace for the first round of silicon carbide vapor deposition to prepare a silicon carbide substrate, with 2-4 deposition heats;

[0036] S302: preparing the second round of silicon carbide substrate; removing the forming mold on the lens barrel preform, and inspecting the appearance, wall thickness and profile of the lens barrel preform;

[0037] If the test results meet the molding standards, the lens barrel preform is placed in the CVI deposition furnace to continue the preparation of the silicon carbide substrate, depositing 1-3 times;

[0038] If the test result does not meet the molding standard, the lens barrel preform is calibrated and then placed in a CVI deposition furnace to continue preparing the silicon carbide substrate, with 1-3 deposition cycles.

[0039] In this solution, silicon carbide is vapor-deposited on the lens barrel preform to obtain a dense silicon carbide matrix, thereby enhancing the density of the lens barrel preform.

[0040] Furthermore, S4 includes:

[0041] S401: performing rough machining on the lens barrel preform; removing burrs on the edge of the lens barrel preform and burrs on the outer surface of the lens barrel preform;

[0042] S402: the third round of silicon carbide substrate preparation; placing the lens barrel preform into the CVI deposition furnace to prepare the silicon carbide substrate again;

[0043] S403: performing fine processing on the lens barrel preform to obtain a lens barrel preform whose size meets the molding standard.

[0044] In this scheme, fibers may be leaking out from the surface of the lens barrel preform after rough machining, so the third round of silicon carbide matrix preparation can wrap the leaking fibers.

[0045] The beneficial effects of the present invention are:

[0046] The ceramic-based composite optical-mechanical lens barrel provided by the present invention combines the excellent properties of ceramic materials with the processing convenience of composite materials, and has the advantages of low thermal expansion coefficient and high hardness; it also has high processing precision and is lighter than lens barrels made of metal materials, which greatly improves the stability and service life of optical instruments.

[0047] In the method for forming a ceramic-based composite optical machine lens barrel provided by the present invention, carbon cloth is laid and shaped, and a barrel preform, a flange preform and a rib preform are prepared one by one using the carbon cloth, and then each preform is sewn and formed to obtain a lens barrel preform; the lens barrel preform is placed in a forming mold, and then an interface layer and a silicon carbide matrix are prepared in sequence to form a lens barrel of a ceramic-based composite material, thereby realizing an integral forming process of the lens barrel, without the need to form each component separately and then assemble it, simplifying the forming process, shortening the production cycle, improving the forming efficiency, and reducing the cost. During the forming process, the lens barrel preform is subjected to the preparation of the interface layer and the silicon carbide matrix as a whole, without the need to perform mechanical processing on each component separately, thereby reducing the waste of materials and improving the utilization rate of raw materials.

[0048] In the ceramic-based composite optical machine lens barrel forming method provided by the present invention, a combined process of chemical vapor infiltration and reactive melt infiltration is adopted, and the preparation cycle is about 40-45 days. The preparation cycle of the conventional chemical vapor infiltration process is 60-70 days, and the preparation cycle is shortened by nearly 30%. It can not only meet the demand for lightweight support tubes, but also provide sufficient rigidity during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a schematic diagram of the structure of a ceramic-based composite optical-mechanical lens barrel of the present invention;

[0050] Figure 2 An exploded view of a ceramic-based composite optical-mechanical lens barrel of the present invention;

[0051] Figure 3 This is a schematic diagram of the structure of a molding die for a ceramic-based composite optical machine lens barrel of the present invention;

[0052] Figure 4 This is an exploded view of a molding die for a ceramic-based composite optical machine lens barrel of the present invention.

[0053] Reference numerals:

[0054] 1. Cylinder; 2. Flange; 3. Vertical rib; 4. Inner mold assembly; 41. Inner mold plate; 5. Flange mold assembly; 51. Upper flange mold; 52. Lower flange mold; 6. Box mold assembly; 61. Box mold; 7. Reinforcement ring; 8. Cover plate assembly; 81. Cover plate; DETAILED DESCRIPTION

[0055] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. The specific implementation of the present invention is described below to facilitate the understanding of the present invention by those skilled in the art, but it should be clear that the present invention is not limited to the scope of the specific implementation. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention defined and determined by the attached claims, these changes are obvious, and all inventions and creations using the concept of the present invention are protected.

[0056] Example 1

[0057] like Figure 1 and Figure 2 As shown, this embodiment provides a ceramic-based composite optical machine lens barrel, which combines the excellent performance of ceramic materials with the convenience of composite material processing, has the advantages of low thermal expansion coefficient and high hardness; and has high processing accuracy, which greatly improves the stability and service life of optical instruments; it specifically includes:

[0058] Cylinder 1, flange 2 and vertical rib 3;

[0059] Two flanges 2 are respectively provided at both ends of the barrel 1; vertical ribs 3 are provided on the outer surface of the barrel 1, and the vertical ribs 3 are provided on the outer side of the barrel 1, thereby improving the overall anti-deformation ability of the lens barrel.

[0060] Example 2

[0061] like Figure 3 As shown, this embodiment provides a molding die of a ceramic-based composite material optical-mechanical lens barrel based on a ceramic-based composite material optical-mechanical lens barrel provided in Embodiment 1, which is used to realize the integral molding of the ceramic-based composite material lens barrel; it specifically includes:

[0062] Inner mold assembly 4, box mold assembly 6 and flange mold assembly 5;

[0063] Among them, a box-type mold assembly 6 is arranged outside the inner mold assembly 4, and a cavity is formed between the inner mold assembly 4 and the box-type mold assembly 6 for forming the barrel 1 and the vertical rib 3; a reinforcing ring 7 is fixed outside the box-type mold assembly 6, and the reinforcing ring 7 fixes the box-type mold assembly 6; flange mold assemblies 5 are arranged at both ends of the inner mold assembly 4, and a cavity is formed between the flange mold assembly 5 and the box-type mold assembly 6 for forming the flange 2; this design can realize the one-piece molding of the lens barrel, and the overall connection strength of the lens barrel is high after molding, and it is also convenient for the later preparation of the silicon carbide matrix of the lens barrel as a whole.

[0064] like Figure 4As shown, the inner mold assembly 4 includes four inner mold plates 41, each of which is an arc-shaped plate with a quarter arc; the four arc-shaped plates form a circular cylinder; the flange mold assembly 5 includes an upper flange mold 51 and a lower flange mold 52; the upper flange mold 51 and the lower flange mold 52 are respectively fixed to the two ends of the circular cylinder through the cover plate assembly 8.

[0065] The cover plate assembly 8 includes four cover plates 81 , which form a circular ring. The outer side of the circular ring is fixed on the box-shaped mold assembly 6 , and the inner side of the circular ring presses the upper flange mold 51 or the lower flange mold 52 .

[0066] Furthermore, the box-shaped mold assembly 6 includes a plurality of box-shaped molds 61, which are arranged on the outer surface of the circular cylinder and fixed by a plurality of reinforcing rings 7; the specific size and number of the box-shaped molds 61 can be determined according to the number of vertical ribs 3 of the actual lens barrel.

[0067] Example 3

[0068] This embodiment provides a method for forming a ceramic-based composite material optical-mechanical lens barrel based on the ceramic-based composite material optical-mechanical lens barrel provided in Embodiment 1, comprising the following steps:

[0069] S1: Prepare a lens barrel preform; specifically including:

[0070] S101: forming a cylinder preform; using carbon cloth to wrap around the inner mold assembly 4, and sewing and fixing with carbon fiber to obtain a cylinder preform; performing right-angle flanging on both ends of the cylinder preform to expose two flange edges for connecting with the flange preform; when flanging, flanging two layers of cloth, padding a layer of cloth, and each layer can be bonded with glue first; after the flanging of the flange edges on both sides is completed, the excess cloth is cut off to retain enough margin for locking the edges;

[0071] S102: forming a flange preform; laying carbon cloth on the end faces of two flange edges, and sewing and fixing with carbon fiber after laying to prepare a flange preform; requiring the shape of the laid carbon cloth to be consistent with the shape of the flange edge, and cutting and removing excess carbon cloth;

[0072] S103: forming a rib preform; cutting out a rectangular carbon cloth, and performing right-angle flanging on the four sides of the rectangular carbon cloth to obtain a box-shaped part, and using a blade to cut the carbon cloth in the area of ​​the weight-reducing hole at the bottom of the box-shaped part; fixing the box-shaped part with the weight-reducing hole cut out to the outer surface of the cylinder preform, and sewing and fixing the flanging of two adjacent box-shaped parts by carbon fiber, and piercing and sewing the flange edges of the box-shaped part and the cylinder preform, and the flange edges of the box-shaped part and the end of the cylinder preform to obtain a lens barrel preform;

[0073] S104: Install the forming mold; place the corresponding box-shaped mold 61 inside each box-shaped part, and install a reinforcing ring 7 outside the box-shaped mold 61 to fix it; if there is a gap or interference between the upper and lower flange edges of the box-shaped part and the cylinder preform, the gap can be adjusted by adding or removing carbon cloth;

[0074] An upper flange mold 51 and a lower flange mold 52 are respectively installed on both sides of the two flange preforms, and a cover plate assembly 8 is installed to fix the upper flange mold 51 and the lower flange mold 52 .

[0075] S2: Using chemical vapor deposition process to prepare the interface layer of the lens barrel preform; specifically including:

[0076] S201: First interface layer preparation: placing the lens barrel preform together with the forming mold into a CVI deposition furnace for chemical vapor deposition to prepare an interface layer, so that the lens barrel preform is shaped in the forming mold; after deposition out of the furnace, the thickness of the interface layer is tested;

[0077] S202: preparing the interface layer for the second time; removing the forming mold on the lens barrel preform, placing the lens barrel preform alone into the CVI deposition furnace for chemical vapor deposition, and preparing the interface layer again to ensure that the interface layer can be evenly deposited on the entire surface of the lens barrel preform; after deposition out of the furnace, measuring the thickness of the interface layer;

[0078] S203: high temperature treatment; after the interface layer is deposited, the forming mold is reinstalled on the lens barrel preform, and the lens barrel preform and the forming mold are subjected to high temperature treatment.

[0079] S3: Using chemical vapor deposition process to prepare silicon carbide substrate for the lens barrel preform; specifically including:

[0080] S301: Preparation of the first round of silicon carbide substrate: placing the high-temperature treated lens barrel preform and the forming mold into a CVI deposition furnace for the first round of silicon carbide vapor deposition to obtain a dense silicon carbide substrate and enhance the density of the lens barrel preform, with 2-4 deposition furnaces;

[0081] S302: The second round of silicon carbide substrate preparation; the molding mold on the lens barrel preform is removed, and the appearance, wall thickness and profile of the lens barrel preform are inspected; if the inspection result meets the molding standard, the lens barrel preform is placed in the CVI deposition furnace to continue the silicon carbide substrate preparation, and the deposition is performed for 1-3 batches; if the inspection result does not meet the molding standard, the lens barrel preform is calibrated and placed in the CVI deposition furnace to continue the silicon carbide substrate preparation, and the deposition is performed for 1-3 batches.

[0082] S4: Mechanically process the lens barrel preform; specifically including:

[0083] S401: performing rough machining on the lens barrel preform; removing burrs on the edge of the lens barrel preform and burrs on the outer surface of the lens barrel preform;

[0084] S402: the third round of silicon carbide matrix preparation; placing the lens barrel preform into the CVI deposition furnace for another silicon carbide matrix preparation; after rough machining, fibers may be leaking from the surface of the lens barrel preform, so the third round of silicon carbide matrix preparation can wrap the leaking fibers;

[0085] S403: performing fine processing on the lens barrel preform to obtain a lens barrel preform whose size meets the molding standard.

[0086] S5: The silicon carbide matrix of the lens barrel preform is prepared by a reactive melt infiltration process. After it is taken out of the furnace, the density of the lens barrel preform is tested to meet the final density index of the lens barrel component.

[0087] The embodiments are intended to help readers understand the principles of the present invention, and it should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. A person skilled in the art can make various other specific variations and combinations that do not deviate from the essence of the present invention based on the technical inspiration disclosed by the present invention, and these variations and combinations are still within the protection scope of the invention.

Claims

1. A ceramic-based composite optical-mechanical lens barrel, characterized in that: It comprises a cylinder (1), two flanges (2) are respectively arranged at two ends of the cylinder (1), and vertical ribs (3) are arranged on the outer surface of the cylinder (1).

2. A molding die for a ceramic matrix composite optical machine lens barrel according to claim 1, characterized in that: It comprises an inner mold assembly (4), a box-shaped mold assembly (6) is arranged outside the inner mold assembly (4), and a reinforcement ring (7) is fixed outside the box-shaped mold assembly (6); flange mold assemblies (5) are arranged at both ends of the inner mold assembly (4).

3. The forming die of the ceramic matrix composite optical machine lens barrel according to claim 2, characterized in that: The inner mold assembly (4) comprises four inner mold plates (41), each of the inner mold plates (41) being an arc-shaped plate with a quarter arc; the four arc-shaped plates form a circular cylinder; The flange mold assembly (5) comprises an upper flange mold (51) and a lower flange mold (52); the upper flange mold (51) and the lower flange mold (52) are respectively fixed to the two ends of the circular cylinder through a cover plate assembly (8).

4. The molding die for the ceramic-based composite optical machine lens barrel according to claim 3, characterized in that: The cover plate assembly (8) comprises four cover plates (81), the four cover plates (81) forming a circular ring, the outer side of the circular ring being fixed on the box-shaped mold assembly (6), and the inner side of the circular ring pressing and fixing the upper flange mold (51) or the lower flange mold (52).

5. The forming die of the ceramic matrix composite optical machine lens barrel according to claim 4, characterized in that: The box-shaped mold assembly (6) comprises a plurality of box-shaped molds (61), and the plurality of box-shaped molds (61) are arranged on the outer surface of the circular cylinder and fixed by a plurality of reinforcement rings (7).

6. A method for forming a ceramic matrix composite optical machine lens barrel according to claim 5, characterized in that: The following steps are involved: S1: preparing a lens barrel preform; S2: preparing an interface layer on the lens barrel preform by using a chemical vapor deposition process; S3: preparing a silicon carbide substrate for the lens barrel preform by using a chemical vapor deposition process; S4: machining the lens barrel preform; S5: Prepare a silicon carbide matrix on the lens barrel preform by using a reactive melt infiltration process.

7. The method for forming a ceramic-based composite optical machine lens barrel according to claim 6, characterized in that: The S1 includes: S101: forming a cylinder preform; using carbon cloth to wrap around the inner mold assembly (4) to form a cylinder preform, and using carbon fiber to sew and fix to obtain a cylinder preform; performing right-angle flanging on both ends of the cylinder preform to form two flange edges for connecting with the flange preform; S102: forming a flange preform; laying carbon cloth on the end surfaces of two flange edges, and sewing and fixing with carbon fiber after laying to prepare a flange preform; S103: forming a rib preform; cutting out a rectangular carbon cloth, and performing right-angle flanging on the four sides of the rectangular carbon cloth to obtain a box-shaped part, and cutting the carbon cloth in the area of ​​the weight-reducing hole at the bottom of the box-shaped part; fixing the box-shaped part with the weight-reducing hole cut out on the outer surface of the barrel preform, and fixing the flanging of two adjacent box-shaped parts by sewing carbon fibers to obtain a lens barrel preform; S104: Installing the molding mold; placing a corresponding box-shaped mold (61) inside each box-shaped part, and installing a reinforcing ring (7) outside the box-shaped mold (61) for fixing; An upper flange mold (51) and a lower flange mold (52) are respectively installed on both sides of the two flange preforms, and a cover plate assembly (8) is installed to fix the upper flange mold (51) and the lower flange mold (52).

8. The method for forming a ceramic-based composite optical-mechanical lens barrel according to claim 7, characterized in that: The S2 includes: S201: First interface layer preparation: placing the lens barrel preform together with the forming mold into a CVI deposition furnace for chemical vapor deposition to prepare an interface layer; S202: preparing the interface layer for the second time; removing the forming mold on the lens barrel preform, placing the lens barrel preform alone into a CVI deposition furnace for chemical vapor deposition, and preparing the interface layer again; S203: high temperature treatment; after the interface layer is deposited, the forming mold is reinstalled on the lens barrel preform, and the lens barrel preform and the forming mold are subjected to high temperature treatment.

9. The method for forming a ceramic-based composite optical-mechanical lens barrel according to claim 8, characterized in that: The S3 includes: S301: First round of silicon carbide substrate preparation: placing the high-temperature treated lens barrel preform and the forming mold into a CVI deposition furnace for the first round of silicon carbide vapor deposition to prepare a silicon carbide substrate, with 2-4 deposition heats; S302: preparing the second round of silicon carbide substrate; removing the forming mold on the lens barrel preform, and inspecting the appearance, wall thickness and profile of the lens barrel preform; If the test results meet the molding standards, the lens barrel preform is placed in the CVI deposition furnace to continue the preparation of the silicon carbide substrate, depositing 1-3 times; If the test result does not meet the molding standard, the lens barrel preform is calibrated and then placed in a CVI deposition furnace to continue preparing the silicon carbide substrate, with 1-3 deposition cycles.

10. The method for forming a ceramic-based composite optical-mechanical lens barrel according to claim 9, characterized in that: The S4 includes: S401: performing rough machining on the lens barrel preform; removing burrs on the edge of the lens barrel preform and burrs on the outer surface of the lens barrel preform; S402: the third round of silicon carbide substrate preparation; placing the lens barrel preform into the CVI deposition furnace to prepare the silicon carbide substrate again; S403: performing fine processing on the lens barrel preform to obtain a lens barrel preform whose size meets the molding standard.

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