A ceramic matrix composite integrated forming die and method for primary and secondary mirror support cylinders

Abstract

The application discloses a ceramic matrix composite integrated forming die and method for primary and secondary mirror supporting cylinders, and solves the problem that the existing primary and secondary mirror supporting cylinders are made by the method of being separately manufactured and assembled, which causes the fibers to not have continuity and the sizes between various parts to be prone to over tolerance. The application comprises a cylinder inner die, a cylinder outer die, a support outer die and a circular top cover; the cylinder inner die comprises a circular plate inner die, a cylinder inner die and a square cylinder inner die which are coaxially connected in sequence from bottom to top; the cylinder outer die comprises N arc-shaped pressing outer dies which are arranged around the cylinder inner die, wherein N is greater than or equal to 2 and is a positive integer; the support outer die comprises four support dies; the four support dies are arranged outside the upper section of the cylinder inner die and the square cylinder inner die. The application can integrally form the circular supporting cylinder and the square supporting cylinder, improves the strength of the primary and secondary mirror supporting cylinders, and avoids the problem that the assembly is difficult due to the size over tolerance of a single part in the forming process of the split structure.

Description

TECHNICAL FIELD

[0001] The application relates to a primary and secondary mirror support cylinder, in particular to a ceramic matrix composite integrated forming die and method for the primary and secondary mirror support cylinder. BACKGROUND

[0002] The primary and secondary mirror support cylinder is the most critical support structure of an optical remote sensor, and is used for supporting an optical detector and related circuits, and has high thermal stability and mechanical property requirements. Figure 1 As shown in the figure, the primary and secondary mirror support cylinder comprises a circular support cylinder 01, a square support cylinder 02 and a support bracket; the lower end of the circular support cylinder 01 is provided with an outward annular flange 03; the square support cylinder 02 is arranged at the top center of the circular support cylinder 01, and the side length of the square support cylinder 02 is smaller than the diameter of the circular support cylinder 01, so that a connecting ring 06 is vertically connected between the lower end of the square support cylinder 02 and the upper end of the circular support cylinder 01; the support bracket comprises four support plates 04 uniformly arranged around the circular support cylinder 01 and the square support cylinder 02 and a support ring 05 arranged at the top of the four support plates 04; the four support plates 04 are respectively located at the center of the four sides of the square support cylinder 02, and are vertically connected with the four sides, and are also connected with the outer wall of the upper part of the circular support cylinder 01. It can be seen that the primary and secondary mirror support cylinder is a complex structure containing a circular-to-square cylinder structure, which is generally made of ceramic matrix composite material. The ceramic matrix composite material is a new type of thermal structure / function integrated material with the advantages of metal material, ceramic material and carbon material, and has the characteristics of high temperature resistance, low density, high specific strength, high specific modulus, oxidation resistance, ablation resistance, crack insensitivity and no catastrophic damage, and is widely used in components.

[0003] At present, the circular-to-square cylinder structure of SiC / SiC and C / SiC composite materials generally adopts a split structure densification and shaping, and finally the parts of each split structure are assembled. The part die of the split structure is formed by simple structure splicing, and finally fixed and formed by bolts and pins. In this way, the size of each part is easy to exceed the tolerance, which often leads to large assembly difficulty and cannot meet the high-precision structure forming requirements. Moreover, for the cylinder structure combined with a circle and a square, the shaping process is more difficult, not only the fiber needs to have high continuity, but also the appearance of the shaped cylinder structure needs to be complete, and the finally prepared primary and secondary mirror support cylinder needs to have high strength, but the primary and secondary mirror support cylinder prepared by the existing split structure cannot meet the requirements. SUMMARY

[0004] In order to solve the technical problems that the existing primary and secondary mirror supporting cylinders are made by the method of split production and reassembly, resulting in that the fibers do not have continuity, the sizes of various parts are prone to exceed the tolerance, and the strength of the primary and secondary mirror supporting cylinders cannot meet the requirements, the application provides a ceramic matrix composite integrated forming die and method for primary and secondary mirror supporting cylinders.

[0005] In order to achieve the above-mentioned purpose, the application adopts the following technical scheme:

[0006] A ceramic matrix composite integrated forming die for primary and secondary mirror supporting cylinders, characterized in that: comprising a cylinder inner die, a cylinder outer die, a support outer die and a circular top cover;

[0007] The cylinder inner die comprises a circular plate inner die, a circular cylinder inner die and a square cylinder inner die which are coaxially connected in sequence from bottom to top; the circular plate inner die is provided with a forming area matched with the annular flange of the primary and secondary mirror supporting cylinder to be prepared, for manufacturing the annular flange; the outer wall of the circular cylinder inner die is a forming area thereof, for manufacturing the circular supporting cylinder of the primary and secondary mirror supporting cylinder to be prepared; the side wall of the square cylinder inner die is a forming area thereof, for manufacturing the square supporting cylinder of the primary and secondary mirror supporting cylinder to be prepared; a connecting ring die is vertically connected between the lower end of the square cylinder inner die and the upper end of the circular cylinder inner die; the outer wall of the connecting ring die is a forming area thereof, for manufacturing the connecting ring of the primary and secondary mirror supporting cylinder to be prepared;

[0008] The cylinder outer die comprises N arc-shaped pressing outer dies arranged around the circular cylinder inner die, N is greater than or equal to 2 and is a positive integer; adjacent arc-shaped pressing outer dies are detachably connected; each arc-shaped pressing outer die is detachably connected with the circular plate inner die; the height of the arc-shaped pressing outer die is lower than that of the circular cylinder inner die, so that the N arc-shaped pressing outer dies are arranged on the lower segment of the circular cylinder inner die;

[0009] The support outer die comprises four support split dies; the four support split dies are arranged outside the upper segment of the circular cylinder inner die and the square cylinder inner die; adjacent support split dies are detachably connected; each of the four support split dies is provided with a forming area matched with the support plate and the quarter support ring of the primary and secondary mirror supporting cylinder to be prepared, for manufacturing the support plate and the support ring;

[0010] The circular top cover is detachably pressed and assembled on the top of the four support split dies.

[0011] Further, the support split die comprises a first vertical die plate and a second vertical die plate.

[0012] The outer side of the first vertical template and the second vertical template is provided with a shaped area matched with the support plate, and the inner side of the lower end of both is provided with a first notch and a second notch matched with the upper section of the cylindrical inner mold and the generatrix of the outer wall of the square cylindrical inner mold; the side wall between the first notch and the second notch is provided with a female buckle plate with an inner wall matched with the upper section of the cylindrical inner mold and the outer wall of the square cylindrical inner mold, which can be buckled on the upper section of the cylindrical inner mold and the outer wall of the square cylindrical inner mold; the inner wall of the female buckle plate is the shaped area thereof; the upper end of the inner side of the first vertical template and the second vertical template is connected perpendicularly to each other; the first vertical template and the second vertical template are perpendicularly connected with an upper arc-shaped plate; the upper end of the upper arc-shaped plate is arranged close to the first vertical template and the second vertical template, and the upper arc-shaped plate is detachably connected with the circular top cover; the top surface of the upper arc-shaped plate is the shaped area thereof, which is used for manufacturing a support ring.

[0013] Further, the upper end of the arc-shaped pressing outer mold is provided with an outward arc-shaped upper turning edge, and the lower end is provided with an outward arc-shaped lower turning edge;

[0014] The arc-shaped pressing outer mold is detachably connected with the circular plate inner mold through the arc-shaped lower turning edge;

[0015] The first vertical template and the second vertical template are also perpendicularly connected with a lower arc-shaped plate; the lower end of the lower arc-shaped plate is arranged close to the first vertical template and the second vertical template, and the lower arc-shaped plate is detachably connected with the arc-shaped upper turning edge.

[0016] Further, the inner side of the first vertical template and the second vertical template is provided with a weight-reducing hole;

[0017] The first vertical template and the second vertical template are also perpendicularly connected with a reinforcing plate.

[0018] Further, the bottom of the circular plate inner mold is provided with a support leg.

[0019] A ceramic matrix composite integrated forming method for a primary mirror and a secondary mirror support cylinder, which adopts the ceramic matrix composite integrated forming mold for a primary mirror and a secondary mirror support cylinder, and is characterized by comprising the following steps:

[0020] Step 1, obtain a first carbon cloth with a height greater than the length of the inner mold busbar of the cylinder and a length equal to the outer circumference of the inner mold of the cylinder, wrap the first carbon cloth to the outer wall of the inner mold of the cylinder, so that the first carbon cloth has an upper excess on the upper end of the inner mold of the cylinder and a first lower excess on the lower end of the inner mold of the cylinder; cut a plurality of busbar seams in the upper excess in a circumferential and side-by-side uniform manner, then attach the cut upper excess to the outer wall of the connecting ring mold and the inner mold of the square cylinder, cut a plurality of busbar seams in the first lower excess in a circumferential and side-by-side uniform manner, then attach the cut first lower excess to the forming area on the inner mold of the circular plate, so that a meatless area is formed on the outer wall of the inner mold of the square cylinder and the forming area of the circular plate, and the meatless area is filled with broken carbon cloth; cut off the excess first carbon cloth along the outer circle of the forming area of the circular plate, and cut off the excess first carbon cloth along the upper end face of the inner mold of the square cylinder;

[0021] Step 2, obtain a second carbon cloth with a height greater than the length of the inner mold busbar of the cylinder and a length equal to the outer circumference of the inner mold of the square cylinder, wrap the second carbon cloth to the outer wall of the inner mold of the square cylinder, so that the second carbon cloth has a second lower excess on the lower end of the inner mold of the square cylinder; cut a plurality of busbar seams in the second lower excess in a circumferential and side-by-side uniform manner, then attach the cut second lower excess to the outer wall of the forming area of the connecting ring mold, the inner mold of the cylinder and the circular plate, so that a meatless area is formed on the outer wall of the connecting ring mold, the inner mold of the cylinder and the circular plate, and the meatless area is filled with broken carbon cloth;

[0022] Step 3, obtain a first annular carbon cloth with an inner diameter and an outer diameter matching the forming area of the circular plate, and attach it to the forming area of the circular plate; obtain a third carbon cloth with a height and a length matching the outer wall of the inner mold of the cylinder, and attach it to the outer wall of the inner mold of the cylinder; obtain a second annular carbon cloth matching the shape and size of the connecting ring mold, and attach it to the outer wall of the connecting ring mold; obtain a fourth carbon cloth with a height and a length matching the outer wall of the inner mold of the square cylinder, and attach it to the outer wall of the inner mold of the square cylinder; the first annular carbon cloth, the third carbon cloth, the second annular carbon cloth and the fourth carbon cloth are all whole cloth;

[0023] Step 4, repeat steps 1 to 3 until the thickness of all carbon cloth preforms reaches a first preset value, and the outermost layer is a whole cloth;

[0024] Step 5, surround the lower part of the inner mold of the cylinder with N arc-shaped pressing outer molds of the outer mold of the cylinder;

[0025] Step 6, attach multiple layers of fifth carbon cloth to the forming area of the four support molds, so that the thickness of all fifth carbon cloth reaches a second preset value;

[0026] Step 7, surround the upper part of the inner mold of the cylinder and the inner mold of the square cylinder with the four support molds, and press the circular top cover on the top of the four support molds to obtain a deposition mold;

[0027] Step 8, place the to-be-deposited mold in the chemical vapor deposition equipment, after pyrolytic carbon interface layer preparation and densification treatment, remove the integrated forming mold, and obtain the integrated primary and secondary mirror support cylinder.

[0028] Further, step 6 is specifically:

[0029] On the first vertical mold plate or the second vertical mold plate forming area of each support split mold, a plurality of layers of fifth carbon cloth are attached, and a plurality of layers of fifth carbon cloth are attached on the inner wall of the special-shaped buckle plate, so that the thickness of all the fifth carbon cloth reaches a second preset value.

[0030] Further, after step 1 and before step 2, a punching step is further included:

[0031] Punching holes for sewing on the outer mold of the cylinder body and the outer mold of the support;

[0032] After step 7 and before step 8, a sewing step is further included:

[0033] Sew the joint of the corresponding carbon cloth through the sewing hole, and the sewing principle is one hole one needle.

[0034] Further, in step 4, the first preset value ranges from 2mm to 3mm;

[0035] In step 6, the second preset value ranges from 2mm to 3mm.

[0036] Further, in step 8, the thickness of the prepared pyrolytic carbon interface layer ranges from 150nm to 250nm.

[0037] The beneficial effects of the present application are:

[0038] 1. The integrated cylinder inner mold including the cylindrical inner mold and the square cylindrical inner mold can integrally form the circular support cylinder and the square support cylinder, without separate manufacturing and reassembling, without fixing and riveting through the pin, without causing the size of each part to be out of tolerance, improving the strength of the primary and secondary mirror support cylinder, and avoiding the problem that the separate structure forming process causes the assembly difficulty to be large due to the size of the single part being out of tolerance.

[0039] 2. The ceramic matrix composite integrated forming mold and method for the primary and secondary mirror support cylinder provided by the present application, when attaching the carbon cloth, first attach the carbon cloth from the cylindrical inner mold to the square cylindrical inner mold, and then attach the carbon cloth from the square cylindrical inner mold to the cylindrical inner mold, and also attach the carbon cloth to the circular plate inner mold, the cylindrical inner mold, the connecting ring mold and the square cylindrical inner mold respectively, so that the continuity of the carbon cloth fibers in the longitudinal and circumferential directions is guaranteed, and the strength of the primary and secondary mirror support cylinder is further improved.

[0040] 3. The integrated molding mold for the ceramic matrix composite material for the primary and secondary mirror support cylinder provided by the present invention is further provided with an outer mold for the cylinder composed of N arc-shaped pressing outer molds and a circular top cover. The four support molds can fit tightly against each other, so that all the bonded carbon cloths are pressed by the corresponding modules, which can avoid the expansion and deformation of the preform parts during the deposition process and improve the product quality.

[0041] 4. In the present invention, when cutting the busbar seams, multiple busbar seams are cut evenly around the inner mold of the cylindrical or square tube. In this way, even if the part size is slightly deformed during the chemical vapor deposition process, the deformation will be very uniform, which can ensure that the part has good dimensions after deposition and improve product quality. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the structure of the primary and secondary mirror support cylinder to be prepared according to the present invention;

[0043] 01-Circular support cylinder, 02-Square support cylinder, 03-Annular flange, 04-Support plate, 05-Support ring, 06-Connecting ring;

[0044] Figure 2 This is a schematic diagram of the structure of an integrated molding die for a ceramic matrix composite material used as a support cylinder for primary and secondary mirrors according to the present invention;

[0045] Figure 3 This is a schematic diagram of the inner mold of the cylinder in an embodiment of the present invention;

[0046] Figure 4 This is a schematic diagram of the structure of the outer mold of the cylindrical body in an embodiment of the present invention;

[0047] Figure 5 This is a schematic diagram of the structure of the outer mold of the bracket in an embodiment of the present invention;

[0048] Figure 6 This is one of the structural schematic diagrams of step 1 in the embodiments of the present invention;

[0049] Figure 7 This is the second structural schematic diagram of step 1 in the embodiment of the present invention;

[0050] Figure 8 This is one of the structural schematic diagrams of step 2 in the embodiments of the present invention;

[0051] Figure 9 This is the second structural schematic diagram of step 2 in the embodiment of the present invention;

[0052] Figure 10 This is a schematic diagram of the structure of step 3 in an embodiment of the present invention;

[0053] Figure 11 This is a schematic diagram of step 5 in an embodiment of the present invention;

[0054] Figure 12 is a structural schematic diagram of step 6 in the embodiment of the application.

[0055] Reference signs:

[0056] 1 - inner cylinder mold, 11 - round plate inner mold, 12 - cylindrical inner mold, 13 - square cylinder inner mold, 14 - connecting ring mold, 15 - leg, 2 - outer cylinder mold, 21 - arc-shaped pressing outer mold, 211 - arc-shaped upper flange, 212 - arc-shaped lower flange, 3 - support outer mold, 31 - support split mold, 311 - first vertical mold plate, 312 - second vertical mold plate, 313 - special-shaped buckle plate, 314 - upper arc-shaped plate, 315 - lower arc-shaped plate, 316 - weight-reducing hole, 317 - reinforcing plate, 4 - circular top cover, 5 - first carbon cloth, 51 - upper excess amount, 52 - first lower excess amount, 6 - broken carbon cloth, 7 - second carbon cloth, 71 - second lower excess amount, 81 - first annular carbon cloth, 82 - third carbon cloth, 83 - second annular carbon cloth, 84 - fourth carbon cloth, 9 - fifth carbon cloth. DETAILED DESCRIPTION

[0057] The technical solutions of the present application will be described clearly and completely in combination with the drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0058] The embodiment of the present application provides a ceramic matrix composite integrated forming mold for primary and secondary mirror support cylinders, as shown in the figure. Figure 2 The integrated forming mold comprises an inner cylinder mold 1, an outer cylinder mold 2, a support outer mold 3 and a circular top cover 4.

[0059] As shown in the figure, the inner cylinder mold 1 comprises a round plate inner mold 11, a cylindrical inner mold 12 and a square cylinder inner mold 13 connected coaxially in sequence from bottom to top; the bottom of the round plate inner mold 11 is provided with three legs 15. The round plate inner mold 11 is provided with a forming area matched with the annular flange 03 of the to-be-prepared primary and secondary mirror support cylinder, for manufacturing the annular flange 03; the outer wall of the cylindrical inner mold 12 is a forming area thereof, for manufacturing the circular support cylinder 01 of the to-be-prepared primary and secondary mirror support cylinder; the side wall of the square cylinder inner mold 13 is a forming area thereof, for manufacturing the square support cylinder 02 of the to-be-prepared primary and secondary mirror support cylinder; a connecting ring mold 14 is vertically connected between the lower end of the square cylinder inner mold 13 and the upper end of the cylindrical inner mold 12; the outer wall of the connecting ring mold 14 is a forming area thereof, for manufacturing the connecting ring 06 of the to-be-prepared primary and secondary mirror support cylinder; Figure 3 As shown in the figure, the outer cylinder mold 2 comprises an arc-shaped pressing outer mold 21 and a support outer mold 3.

[0060] As shown in the figure, the arc-shaped pressing outer mold 21 comprises an arc-shaped upper flange 211 and an arc-shaped lower flange 212. Figure 4As shown, the barrel outer mold 2 comprises three arc-shaped pressing outer molds 21 arranged around the cylindrical inner mold 12; adjacent arc-shaped pressing outer molds 21 are detachably connected; each arc-shaped pressing outer mold 21 is detachably connected with the circular plate inner mold 11; the height of the arc-shaped pressing outer mold 21 is lower than the cylindrical inner mold 12, so that the barrel outer mold 2 is arranged on the lower section of the cylindrical inner mold 12; the upper end of each arc-shaped pressing outer mold 21 is provided with an outward arc-shaped upper flange 211, and the lower end is provided with an outward arc-shaped lower flange 212; the arc-shaped pressing outer mold 21 is detachably connected with the circular plate inner mold 11 through the arc-shaped lower flange 212;

[0061] The support outer mold 3 comprises four support split molds 31; the four support split molds 31 are arranged outside the upper section of the cylindrical inner mold 12 and the square tube inner mold 13; adjacent support split molds 31 are detachably connected; the four support split molds 31 are respectively provided with a forming area matched with the support plate 04 and the quarter support ring 05 of the main and secondary mirror support barrel to be prepared, for manufacturing the support plate 04 and the support ring 05.

[0062] As shown in Figure 5 The support split mold 31 comprises a first vertical mold plate 311 and a second vertical mold plate 312; the outer side of the first vertical mold plate 311 and the second vertical mold plate 312 is provided with a forming area matched with the support plate 04, and the inner side of the lower end of both is provided with a first gap and a second gap matched with the outer wall generatrix of the upper section of the cylindrical inner mold 12 and the square tube inner mold 13; the side wall between the first gap and the side wall of the second gap is provided with a heterogeneous buckle plate 313 whose inner wall is matched with the outer wall of the upper section of the cylindrical inner mold 12 and the square tube inner mold 13, which can be buckled on the outer wall of the upper section of the cylindrical inner mold 12 and the square tube inner mold 13; the inner wall of the heterogeneous buckle plate 313 is its forming area; the inner side of the upper end of the first vertical mold plate 311 and the second vertical mold plate 312 is connected perpendicularly to each other. The first vertical mold plate 311 and the second vertical mold plate 312 are perpendicularly connected with an upper arc-shaped plate 314 and a lower arc-shaped plate 315; the upper arc-shaped plate 314 is arranged close to the upper end of the first vertical mold plate 311 and the second vertical mold plate 312, and is detachably connected with the circular top cover 4; the lower arc-shaped plate 315 is arranged close to the lower end of the first vertical mold plate 311 and the second vertical mold plate 312, and is detachably connected with the arc-shaped upper flange 211. The inner side of the first vertical mold plate 311 and the second vertical mold plate 312 is provided with a weight-reducing hole 316; the first vertical mold plate 311 and the second vertical mold plate 312 are also perpendicularly connected with a reinforcing plate 317.

[0063] The circular top cover 4 is detachably pressed on the top of the four support split molds 31.

[0064] The ceramic matrix composite integrated forming mold for the main and secondary mirror support barrel is used to prepare the main and secondary mirror support barrel, and specifically comprises the following steps:

[0065] Step 1, as Figure 6As shown, the first carbon cloth 5 with a height greater than the length of the busbar of the inner cylinder mold 1 and a length equal to the outer circumference of the inner cylinder mold 1 is wound to the outer wall of the inner cylinder mold 12, so that the first carbon cloth 5 has an upper excess 51 at the upper end of the inner cylinder mold 12 and a first lower excess 52 at the lower end of the inner cylinder mold 12; after cutting the upper excess 51 into 6 busbar cuts in the circumferential direction, the cut upper excess 51 is attached to the outer wall of the connecting ring mold 14 and the square cylinder mold 13; after cutting the first lower excess 52 into 6 busbar cuts in the circumferential direction, the cut first lower excess 52 is attached to the forming area of the circular plate inner mold 11, so that the outer wall of the square cylinder mold 13 and the forming area of the circular plate inner mold 11 both form a meatless area, as shown in Figure 7 As shown, the meatless area is filled with the broken carbon cloth 6; the excess first carbon cloth 5 is cut along the outer circle of the forming area of the circular plate inner mold 11 and the upper end face of the square cylinder mold 13; as the name implies, the busbar cut is a cut in the length direction along the corresponding busbar.

[0066] Punching step: punch a sewing hole on the outer cylinder mold 2 and the support outer mold 3, the hole center distance is 6-10mm, and the hole diameter is 3-5mm;

[0067] Step 2, as shown in Figure 8 As shown, the second carbon cloth 7 with a height greater than the length of the busbar of the inner cylinder mold 1 and a length equal to the outer wall circumference of the square cylinder mold 13 is wound to the outer wall of the square cylinder mold 13, so that the second carbon cloth 7 has a second lower excess 71 at the lower end of the square cylinder mold 13; after cutting the second lower excess 71 into 6 busbar cuts in the circumferential direction, the cut second lower excess 71 is attached to the outer wall of the connecting ring mold 14, the inner cylinder mold 12 and the forming area of the circular plate inner mold 11, so that the outer wall of the connecting ring mold 14, the inner cylinder mold 12 and the circular plate inner mold 11 all form a meatless area, as shown in Figure 9 As shown, the meatless area is filled with the broken carbon cloth 6;

[0068] Step 3, as shown in Figure 10 As shown, the first annular carbon cloth 81 with an inner diameter and an outer diameter matching the forming area of the circular plate inner mold 11 is attached to the forming area of the circular plate inner mold 11; the third carbon cloth 82 with a height and a length matching the outer wall of the inner cylinder mold 12 is attached to the outer wall of the inner cylinder mold 12; the second annular carbon cloth 83 with a shape and size matching the connecting ring mold 14 is attached to the outer wall of the connecting ring mold 14; the fourth carbon cloth 84 with a height and a length matching the outer wall of the square cylinder mold 13 is attached to the outer wall of the square cylinder mold 13; the first annular carbon cloth 81, the third carbon cloth 82, the second annular carbon cloth 83 and the fourth carbon cloth 84 are all whole cloth;

[0069] Step 4, repeat steps 1 to 3 until the thickness of all carbon cloth preforms reaches a first preset value, and the outermost carbon cloth is a whole cloth; the first preset value ranges from 2 mm to 3 mm; preferably 2.5 mm in this embodiment;

[0070] Step 5, as shown in Figure 11 , the three arc-shaped pressing outer molds 21 of the cylinder outer mold 2 are installed around the lower segment of the cylindrical inner mold 12, and positioning pins, bolts and nuts are installed;

[0071] Step 6, as shown in Figure 12 , the first vertical mold plate 311 or the second vertical mold plate 312 of each support split mold 31 is pasted with multiple layers of the fifth carbon cloth 9, and the inner wall of the special-shaped buckle plate 313 is pasted with multiple layers of the fifth carbon cloth 9, so that the thickness of all the fifth carbon cloth 9 reaches a second preset value. The second preset value ranges from 2 mm to 3 mm; preferably 2.5 mm in this embodiment;

[0072] Step 7, the four support split molds 31 are installed around the upper segment of the cylindrical inner mold 12 and the square cylindrical inner mold 13, and the circular top cover 4 is pressed onto the top of the four support split molds 31, and positioning pins, bolts and nuts are installed, to obtain a deposition mold;

[0073] Sewing step: the joints of the corresponding carbon cloth are sewn through the sewing holes, and the sewing principle is one hole one needle.

[0074] Step 8, the deposition mold is placed in a chemical vapor deposition device, and after pyrolytic carbon interface layer preparation and densification treatment, the integrated forming mold is removed to obtain an integrated primary and secondary mirror support cylinder. The thickness of the prepared pyrolytic carbon interface layer ranges from 150 nm to 250 nm. Specifically, it includes:

[0075] 8.1, the deposition mold is placed in a chemical vapor deposition device to prepare a pyrolytic carbon interface layer. The thickness of the interface layer is tested by SEM, and the thickness of the pyrolytic carbon interface layer is required to be about 150 nm to 250 nm. The mold and the preform after completing the preparation of the pyrolytic carbon interface layer are subjected to high temperature treatment in the chemical vapor deposition device, and the temperature is about 1800℃ to 1900℃.

[0076] 8.2, the mold and the preform after completing step 8.1 are placed into a chemical vapor deposition device for densification treatment to prepare a silicon carbide matrix, and the density of the part is required to be about 1.85 g / cm3 to 1.9 g / cm3, to obtain an integrated primary and secondary mirror support cylinder.

[0077] The whole process of pasting carbon cloth ensures that the carbon cloth is tightly pasted with the mold without wrinkles; and the cutting and sewing are as staggered as possible. The carbon cloth used in this embodiment is plain carbon cloth.

[0078] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any change or replacement within the technical scope disclosed by the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A ceramic matrix composite integrally formed mold for a primary mirror support cylinder, characterized by: The device comprises a cylinder inner mold (1), a cylinder outer mold (2), a support outer mold (3) and a circular top cover (4); The cylinder inner mold (1) comprises a circular plate inner mold (11), a circular cylinder inner mold (12) and a square cylinder inner mold (13) connected coaxially from bottom to top; the circular plate inner mold (11) is provided with a forming area matched with an annular flange (03) of a main mirror and a secondary mirror support cylinder to be prepared, for manufacturing the annular flange (03); the outer wall of the circular cylinder inner mold (12) is a forming area thereof, for manufacturing a circular support cylinder (01) of the main mirror and the secondary mirror support cylinder to be prepared; the side wall of the square cylinder inner mold (13) is a forming area thereof, for manufacturing a square support cylinder (02) of the main mirror and the secondary mirror support cylinder to be prepared; a connecting ring mold (14) is vertically connected between the lower end of the square cylinder inner mold (13) and the upper end of the circular cylinder inner mold (12); the outer wall of the connecting ring mold (14) is a forming area thereof, for manufacturing a connecting ring (06) of the main mirror and the secondary mirror support cylinder to be prepared; The cylinder outer mold (2) comprises N arc-shaped pressing outer molds (21) arranged around the circular cylinder inner mold (12), wherein N is greater than or equal to 2 and is a positive integer; adjacent arc-shaped pressing outer molds (21) are detachably connected; each arc-shaped pressing outer mold (21) is detachably connected with the circular plate inner mold (11); the height of the arc-shaped pressing outer mold (21) is lower than that of the circular cylinder inner mold (12), so that the N arc-shaped pressing outer molds (21) are arranged on the lower section of the circular cylinder inner mold (12); The support outer mold (3) comprises four support sub-molds (31); the four support sub-molds (31) are arranged around the upper section of the circular cylinder inner mold (12) and the square cylinder inner mold (13); adjacent support sub-molds (31) are detachably connected; each of the four support sub-molds (31) is provided with a forming area matched with a support plate (04) and a quarter support ring (05) of the main mirror and the secondary mirror support cylinder to be prepared, for manufacturing the support plate (04) and the support ring (05); The circular top cover (4) is detachably pressed and mounted on the top of the four support sub-molds (31); The support sub-mold (31) comprises a first vertical mold plate (311) and a second vertical mold plate (312). The outer side of the first vertical template (311) and the second vertical template (312) is provided with a shaped area matched with the support plate (04), and the inner side of the lower end of both is provided with a first gap and a second gap matched with the upper section of the cylindrical inner mold (12) and the outer wall generatrix of the square cylindrical inner mold (13); the side wall between the first gap and the second gap is provided with a heterogeneous buckle plate (313) matched with the upper section of the cylindrical inner mold (12) and the outer wall of the square cylindrical inner mold (13), which can be buckled on the upper section of the cylindrical inner mold (12) and the outer wall of the square cylindrical inner mold (13); the inner wall of the heterogeneous buckle plate (313) is the shaped area thereof; the upper end of the inner side of the first vertical template (311) and the second vertical template (312) is connected perpendicularly to each other; the upper arc-shaped plate (314) is connected perpendicularly between the first vertical template (311) and the second vertical template (312); the upper arc-shaped plate (314) is arranged close to the upper end of the first vertical template (311) and the second vertical template (312) and is detachably connected with the circular top cover (4); the top surface of the upper arc-shaped plate (314) is the shaped area thereof, which is used for manufacturing the support ring (05).

2. The ceramic matrix composite integrally formed mold for a primary and secondary mirror support cylinder of claim 1, wherein: The upper end of the arc-shaped pressing outer mold (21) is provided with an outward arc-shaped upper turning edge (211), and the lower end is provided with an outward arc-shaped lower turning edge (212); The arc-shaped pressing outer mold (21) is detachably connected with the circular plate inner mold (11) through the arc-shaped lower turning edge (212); The first vertical template (311) and the second vertical template (312) are also perpendicularly connected with the lower arc-shaped plate (315); the lower arc-shaped plate (315) is arranged close to the lower end of the first vertical template (311) and the second vertical template (312) and is detachably connected with the arc-shaped upper turning edge (211).

3. The ceramic matrix composite integrally formed mold for a primary and secondary mirror support cylinder of claim 1, wherein: The inner side of the first vertical template (311) and the second vertical template (312) is provided with a weight-reducing hole (316); The first vertical template (311) and the second vertical template (312) are also perpendicularly connected with the reinforcing plate (317).

4. The ceramic matrix composite integrally formed mold for a primary and secondary mirror support cylinder of any one of claims 1-3, wherein: The bottom of the circular plate inner mold (11) is provided with a support leg (15).

5. A method for integrally molding a ceramic matrix composite material for a primary mirror support cylinder, using the mold for integrally molding a ceramic matrix composite material for a primary mirror support cylinder according to any one of claims 1 to 4, characterized by, The method comprises the following steps: The method comprises the following steps: Step 1: Obtain a first carbon cloth (5) with a height greater than the length of the generatrix of the inner mold (1) and a length equal to the outer circumference of the inner mold (1). Wrap the first carbon cloth (5) around the outer wall of the inner mold (12), leaving an upper allowance (51) at the upper end of the inner mold (12) and a lower allowance (52) at the lower end of the inner mold (12). After cutting multiple generatrix seams evenly in parallel around the upper allowance (51), connect the cut upper allowance (51) to the connecting ring mold (14) and the square inner mold (13). After the outer wall is attached, multiple generatrices are cut evenly in parallel around the first lower allowance (52). The cut first lower allowance (52) is attached to the forming area on the inner mold of the round plate (11). Then, a missing area is formed on the outer wall of the inner mold of the square tube (13) and the forming area of ​​the inner mold of the round plate (11). The missing area is filled by shredded carbon cloth (6). The excess first carbon cloth (5) is cut off along the outer circle of the forming area of ​​the inner mold of the round plate (11). The excess first carbon cloth (5) is cut off along the upper end face of the inner mold of the square tube (13). Step 2: Obtain a second carbon cloth (7) with a height greater than the generatrix of the inner mold (1) of the cylinder and a length equal to the circumference of the outer wall of the inner mold (13) of the square cylinder. Wrap the second carbon cloth (7) around the outer wall of the inner mold (13) of the square cylinder, so that the second carbon cloth (7) leaves a second lower allowance (71) at the lower end of the inner mold (13). After cutting multiple generatrix seams evenly in parallel around the second lower allowance (71), attach the cut second lower allowance (71) to the outer wall of the forming area connecting the ring mold (14), the inner mold (12) of the cylinder and the inner mold (11) of the round plate. Then, a missing area is formed on the outer wall of the connecting ring mold (14), the inner mold (12) of the cylinder and the inner mold (11) of the round plate. Fill the missing area with broken carbon cloth (6). Step 3: Obtain a first annular carbon cloth (81) whose inner and outer diameters match the forming area of ​​the inner mold (11) of the circular plate, and attach it to the forming area of ​​the inner mold (11); obtain a third carbon cloth (82) whose height and length match the outer wall of the inner mold (12) of the cylindrical plate, and attach it to the outer wall of the inner mold (12); obtain a second annular carbon cloth (83) whose shape and size match the connecting ring mold (14), and attach it to the outer wall of the connecting ring mold (14); obtain a fourth carbon cloth (84) whose height and length match the outer wall of the inner mold (13) of the square tube, and attach it to the outer wall of the inner mold (13); the first annular carbon cloth (81), the third carbon cloth (82), the second annular carbon cloth (83) and the fourth carbon cloth (84) are all whole pieces of cloth; Step 4: Repeat steps 1 to 3 until the thickness of all carbon cloth preforms reaches the first preset value and the outermost layer is a whole cloth. Step 5: Install the N arc-shaped pressing outer molds (21) of the outer mold (2) around the lower part of the inner mold (12) of the cylinder; Step 6: Apply multiple layers of fifth carbon cloth (9) to the molding area of ​​the four support molds (31) so that the thickness of all fifth carbon cloths (9) reaches the second preset value; Step 7, four support split molds (31) are arranged around the upper section of the cylindrical inner mold (12) and the square inner mold (13), and a circular top cover (4) is pressed on the top of the four support split molds (31), to obtain a to-be-deposited mold; Step 8, place the to-be-deposited mold in a chemical vapor deposition device, perform pyrolytic carbon interface layer preparation and densification treatment, and then remove the integrated forming mold to obtain an integrated primary and secondary mirror support cylinder.

6. The ceramic matrix composite integrated forming method for a primary and secondary mirror support cylinder according to claim 5, characterized by, Step 6 is specifically: A plurality of fifth carbon cloths (9) are attached to the first vertical mold plate (311) or the second vertical mold plate (312) forming area of each support split mold (31), and a plurality of fifth carbon cloths (9) are attached to the inner wall of the special-shaped buckle plate (313), so that the thickness of all the fifth carbon cloths (9) reaches a second preset value.

7. The ceramic matrix composite integrated forming method for a primary and secondary mirror support cylinder according to claim 6, characterized in that: After step 1 and before step 2, a punching step is further included: Punching holes for sewing on the outer mold (2) and the support outer mold (3); After step 7 and before step 8, a sewing step is further included: Sew the joints of the corresponding carbon cloth through the sewing holes, and the sewing principle is one hole one needle.

8. The ceramic matrix composite integrated forming method for a primary and secondary mirror support cylinder according to claim 7, characterized in that: In step 4, the first preset value ranges from 2mm to 3mm; In step 6, the second preset value ranges from 2mm to 3mm.

9. The ceramic matrix composite integrated forming method for a primary and secondary mirror support cylinder according to claim 8, characterized in that: In step 8, the prepared pyrolytic carbon interface layer has a thickness ranging from 150nm to 250nm.

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