A C / SiC composite material lens barrel bracket forming die and manufacturing method

Abstract

The present invention discloses a C / SiC composite material lens barrel support forming die and a manufacturing method thereof, and relates to the technical field of forming dies. A C / SiC composite material lens barrel support forming die comprises an inner ring shaping base, a circumferential three-claw die, a reinforcement ring die, and a centering shaft; the inner ring shaping base comprises a shaping surface and a placement surface, and the circumferential three-claw die comprises a first shaping arm, a second shaping arm, and a third shaping arm arranged along the circumferential direction of the shaping surface. The present invention uses an assembled die to lay out a preform before integrally shaping the body, thereby reducing deformation caused by density differences between components and improving the yield rate of the lens barrel support. This solves the problem that existing lens barrel support components, which are usually manufactured individually to a certain density, suffer from large deformation of the components, resulting in poor assembly processability.

Description

Technical Field

[0001] The present invention relates to the technical field of forming dies, and in particular to a C / SiC composite material lens barrel bracket forming die and a manufacturing method thereof. Background Art

[0002] The description of the background technology in the present invention belongs to the related technology related to the present invention and is only used to illustrate and facilitate the understanding of the invention content of the present invention. It should not be understood that the applicant explicitly believes or infers that the applicant believes that it is the prior art of the present invention on the filing date of the first application.

[0003] Continuous carbon fiber reinforced ceramic matrix composites (CFCCs) inherit the excellent properties of ceramics, such as low density, high strength, and oxidation resistance, while overcoming the weaknesses of ceramics such as high brittleness and poor reliability. They exhibit fracture behavior similar to that of metals, are insensitive to cracks, and are not prone to catastrophic fracture. This is especially true for carbon fiber reinforced silicon carbide ceramic matrix composites, also known as C / SiC composites. C / SiC composites combine the advantages of C / C composites and SiC ceramics, with a series of excellent properties such as high specific strength, high specific modulus, good temperature stability, high and low temperature resistance, and low density. They have great application potential in the field of satellite optical and mechanical structural materials.

[0004] Chemical vapor infiltration (CVI) is a mature process for preparing carbon fiber-reinforced silicon carbide ceramic-matrix composites. It enables the continuous deposition of the composite's various components—the interface phase, matrix, and outer coating—from a gaseous precursor at moderate temperatures (900-1000°C) and low or atmospheric pressure. The starting material is an n-dimensional (typically n=2 or 3)-dimensional porous fiber preform. During the preform preparation (CVI), the interface phase and SiC matrix are deposited onto the fiber surfaces within the preform's pores. This process offers the following significant advantages: high practicality and low preparation temperatures; effective microscopic design of composite composition; suitability for the preparation of products with high fiber volume fractions, complex shapes, net dimensions, and a wide range of sizes; and minimal fiber damage during the preparation process.

[0005] The tube mount is an important structural load-bearing component in a space telescope. Due to its extreme working environment and launch conditions, the tube mount's stiffness, stability, structural strength, weight control, thermal expansion coefficient, and in-plane quasi-isotropy all greatly affect whether the space telescope can successfully perform its working functions.

[0006] As observation missions evolve, the requirements for the overall strength and rigidity of space telescopes also evolve. Traditional metal telescope barrel bracket components, due to their heavy weight and large thermal expansion coefficient, are not suitable for launch missions. Therefore, the use of ceramic-based composite tube bracket components is a development trend. In the past, the manufacture of ceramic-based composite tube bracket components often involved individually preparing each part to a certain density, then assembling and riveting the multiple parts together to form a whole. This process has the following disadvantages:

[0007] (1) Large deformation of parts leads to poor assembly processability

[0008] In the process of preparing continuous carbon fiber reinforced ceramic matrix composite lens barrel bracket parts using the CVI method, the fiber preform needs to undergo multiple temperature increases and decreases, and the pores inside it gradually become denser. However, the density differences between different parts of the parts will inevitably cause deformation. As the degree of densification increases, these deformations are difficult to eliminate, which brings great difficulties to the assembly of parts and a high scrap rate of parts.

[0009] (2) The overall rigidity of the lens barrel bracket is low and the fundamental frequency fluctuates greatly.

[0010] During the assembly process, bracket products assembled and connected by multiple parts will inevitably have assembly gaps (veneer gaps, seam gaps, connector gaps, etc.). These gaps will lead to adverse phenomena such as weakened load transmission, reduced strength, stiffness and fundamental frequency. Summary of the Invention

[0011] The purpose of the present invention is to provide a C / SiC composite lens barrel bracket forming mold and manufacturing method, so as to solve the problem that the existing lens barrel bracket components are usually prepared separately, each part is prepared to a certain density, and then assembled and riveted, resulting in large deformation of the parts and poor assembly processability.

[0012] The technical solution of the present invention to solve the above technical problems is as follows:

[0013] A C / SiC composite material lens barrel bracket forming die comprises an inner ring shaping base, a circumferential three-claw die, a reinforcement ring die, and a centering shaft; the inner ring shaping base comprises a shaping surface and a placement surface; the circumferential three-claw die comprises a first shaping arm, a second shaping arm, and a third shaping arm arranged along the circumferential direction of the shaping surface; the bottoms of the first shaping arm, the second shaping arm, and the third shaping arm are all buckled on the shaping surface and connected to the inner ring shaping base; the first shaping arm, the second shaping arm, and the third shaping arm are interconnected in pairs to form a three-claw preform forming cavity; the centering shaft is vertical, the top end of the centering shaft is embedded with the reinforcement ring die, and the reinforcement ring die is located at the top of the three-claw preform forming cavity; the bottom end of the centering shaft passes through the three-claw preform forming cavity and is connected to the inner ring shaping base.

[0014] The beneficial effects of adopting the above technical solution are as follows: preform laying process: the inner ring preform is shaped in the inner ring shaping base, and according to the required preform thickness, the three-claw preform is laid on the first shaping arm, the second shaping arm and the third shaping arm, and the reinforcement ring preform is wrapped on the reinforcement ring mold; mold assembly: the bottom end of the centering shaft is connected to the inner ring shaping base, and then the reinforcement ring mold is embedded in the top end of the centering shaft, first the first shaping arm and the second shaping arm are placed on the inner ring shaping base and the first shaping arm and the second shaping arm are pushed toward the center of the inner ring shaping base until the three-claw preforms on the opposite sides of the first shaping arm and the second shaping arm are attached to each other at the same time. When the three-claw preforms on the first shaping arm and the second shaping arm are in contact with and fit into the reinforcement ring preform, the first shaping arm and the second shaping arm no longer move; the third shaping arm is placed on the inner ring shaping inner mold and the third shaping arm is pushed to move on the inner ring shaping inner mold until the third shaping arm and the three-claw preforms on the opposite side of the first shaping arm and the second shaping arm are in contact with each other. When the three-claw preform on the third shaping arm is in contact with and fit into the reinforcement ring preform, the third shaping arm no longer moves, and each three-claw preform, the three-claw preform and the reinforcement ring preform are sewn as a whole. After sewing is completed, the mold and the lens barrel bracket preform are placed into the vapor deposition furnace for vapor deposition.

[0015] This technical solution is aimed at the forming structure of the lens barrel bracket. The inner ring shaping inner mold is set to shape and fix the inner ring preform. The three-claw preform is an open structure. There is an angle between the support arms and the top ends of the support arms are connected to each other. The reinforcing ring preform is embedded in the top of the three-claw preform. The bottom end of each support arm must be connected to the inner ring preform. Considering that the preform is carbon fiber cloth and is not easy to shape, this technical solution sets the first shaping support arm, the second shaping support arm and the third shaping support arm to lay and fix the three-claw preform, which does not affect the subsequent vapor deposition of the three-claw preform and can also ensure that the top and bottom of the three-claw preform are The ends are respectively connected to the reinforcement ring preform and the inner ring preform; the reinforcement ring mold is limited by the centering shaft to avoid the reinforcement ring mold being in a suspended state and offset, so that the reinforcement ring mold is relatively firmly located in the circumferential three-claw mold. The technical solution can first lay the preform and then form the whole through the assembled mold, reducing the deformation caused by the density difference of each component, thereby improving the yield rate of the lens barrel bracket, that is, solving the problem that the existing lens barrel bracket components are usually prepared separately for each part to a certain density, and then assembled and riveted, resulting in large deformation of the parts and poor assembly processability.

[0016] Furthermore, the inner ring shaping base includes an inner ring flanging inner mold and a fixed disc inner mold. The inner ring flanging inner mold is arranged above the fixed disc inner mold. A limiting boss is arranged in the middle of the inner ring flanging inner mold, and multiple shaping bosses are arranged at intervals on the circumferential outer edge of the inner ring flanging inner mold; the limiting boss and the fixed disc inner mold are both provided with an axial hole for connecting the centering shaft.

[0017] The beneficial effects of adopting the above technical solution are: the inner ring preform is flanged by the inner ring flanging inner mold and then fixed with the fixed disc inner mold, so that the inner ring preform is shaped, and the bottom end of the centering shaft extends into the limiting boss and is embedded in the axial hole of the fixed disc inner mold, so that the centering shaft firmly supports the reinforcement ring mold. The inner ring shaping base of this technical solution plays the role of shaping the inner ring preform.

[0018] Furthermore, the diameter of the inner ring flanging inner mold is smaller than the diameter of the fixed disc inner mold, and the inner ring flanging inner mold is connected to the fixed disc inner mold through multiple inner ring pressing outer molds with a step structure; the top of the inner ring pressing outer mold is buckled with the inner ring flanging inner mold and connected to the inner ring flanging inner mold through a second fastener; the bottom of the inner ring pressing outer mold is fit with the fixed disc inner mold and connected to the fixed disc inner mold through a third fastener.

[0019] The beneficial effect of adopting the above scheme is as follows: after the first shaping arm, the second shaping arm and the third shaping arm are installed on the inner ring flanging inner mold, the inner ring pressing outer mold of the stepped structure is buckled onto the inner ring flanging inner mold and the fixed disc inner mold and the second fastener and the third fastener are tightened. The inner ring flanging inner mold and the fixed disc inner mold are separate molds, and the inner ring pressing outer mold serves to connect the inner ring flanging inner mold and the fixed disc inner mold. In addition, since the inner ring preform will rotate to a certain extent in the inner ring flanging inner mold, the technical solution provides an inner ring pressing outer mold to limit the edge of the inner ring preform and reduce the degree of deformation of the inner ring preform during the forming process.

[0020] Furthermore, the first shaping support arm, the second shaping support arm and the third shaping support arm each include a first back plate, a second back plate and an arc-shaped plate connecting the first back plate and the second back plate, an angle is set between the first back plate and the second back plate, the first back plate and the second back plate are buckled on the corresponding shaping bosses, and the outer sides of the first back plate and the second back plate are provided with connecting bosses;

[0021] The first back plate and the adjacent second back plate are arranged opposite to each other, and the connecting bosses between the oppositely arranged first back plate and the second back plate are connected by a fourth fastener.

[0022] Furthermore, it also includes a three-claw reinforcement plate outer mold, the bottom of the first back plate and the second back plate are respectively provided with arc flange plates that fit with the inner ring flange inner mold, the fixed disc inner mold is provided with a slot for clamping the three-claw reinforcement plate outer mold, the bottom of the three-claw reinforcement plate outer mold is connected to the fixed disc inner mold through a fifth fastener, and the top of the three-claw reinforcement plate outer mold is connected to the inner ring flange inner mold through a radial pulling assembly.

[0023] The beneficial effects of adopting the above technical solution are as follows: a three-claw reinforcement plate preform is also provided on the outer edge of the three-claw preform. After the first shaping arm, the second shaping arm, and the third shaping arm are fixed to the inner mold of the inner ring flange, the three-claw reinforcement plate preform is formed by laying the outer side of the arc flange plate. The three-claw reinforcement plate outer mold is then embedded in the slot, the fifth fastener is tightened, and the radial tension assembly is installed. The three-claw reinforcement plate outer mold and the corresponding shaping arm are simply sewn together. After the first shaping arm, the second shaping arm, and the third shaping arm are installed, the corresponding three-claw reinforcement plate outer mold is installed respectively, so that the three-claw reinforcement plate preform can be integrally formed with the three-claw preform.

[0024] Furthermore, the radial pulling assembly includes a first pulling plate, a second pulling plate and a sixth fastener connecting the first pulling plate and the second pulling plate. The first pulling plate is arranged on the inner side of the shaping boss, and the second pulling plate is arranged on the outer side of the three-claw reinforcement plate outer mold.

[0025] The beneficial effects of the above technical solution are as follows: the first and second clamping plates are positioned on the inner side of the shaping boss and the outer side of the three-jaw reinforcement plate outer mold, respectively; the positions and heights of the first and second clamping plates are adjusted; and the sixth fastener sequentially connects the second and first clamping plates. The provision of the clamping assembly in this technical solution prevents the three-jaw reinforcement plate outer mold from deviating from the first and second back plates, while also providing a certain pressing force on the three-jaw reinforcement plate preform, thereby improving the forming accuracy of the three-jaw reinforcement plate preform and the three-jaw preform.

[0026] Furthermore, the reinforcement ring mold is a hollow structure, and a positioning shaft passes through the reinforcement ring mold. The bottom end of the positioning shaft is embedded in the centering shaft, and the top end of the positioning shaft extends out of the reinforcement ring mold and is provided with a limited separation component.

[0027] Furthermore, the limiting and separating assembly includes a limiting cover plate and three limiting inserts arranged on the outer edge of the circumference of the limiting cover plate. The limiting cover plate is connected to the positioning shaft, the top ends of the limiting inserts are connected to the limiting cover plate, and the bottom ends of the limiting inserts are extended into the three-claw preform forming cavity, thereby separating the reinforcing ring mold from the corresponding support arm.

[0028] A method for manufacturing a C / SiC composite material lens barrel bracket, comprising:

[0029] S1: Design of prefabricated body of lens barrel bracket;

[0030] S2: Design the C / SiC composite lens barrel bracket forming mold;

[0031] S3: punching holes in the forming mold;

[0032] S4: sewing and shaping the lens barrel bracket prefabricated body into the forming mold;

[0033] S5: placing the lens barrel bracket preform together with the forming mold into a chemical vapor deposition furnace for deposition treatment. When the lens barrel bracket preform is deposited to a certain density, the lens barrel bracket preform is mechanically processed.

[0034] 10. In step S4, the sewing and shaping of the lens barrel support prefabricated body includes the following steps:

[0035] S41: flanging the inner ring preform and shaping and sewing it to the inner ring shaping base;

[0036] S42: Laying a three-claw preform on the first shaping support arm, the second shaping support arm, and the third shaping support arm;

[0037] S43: Winding the reinforcement ring preform on the reinforcement ring mold;

[0038] S44: Connect the bottom end of the centering shaft to the inner ring forming base, and then embed the reinforcement ring mold on the top end of the centering shaft;

[0039] S45: placing the first shaping support arm, the second shaping support arm, and the third shaping support arm on the inner ring shaping base and gradually pushing them toward the center of the inner ring shaping base;

[0040] S46: Sewing the three-claw preform and the reinforcement ring preform integrally with corresponding molds.

[0041] The present invention has the following beneficial effects:

[0042] (1) The present invention sets a first shaping arm, a second shaping arm and a third shaping arm for laying and fixing the three-claw preform, which does not affect the subsequent vapor deposition of the three-claw preform and can ensure that the top and bottom ends of the three-claw preform are respectively connected to the reinforcing ring preform and the inner ring preform; the reinforcing ring mold is limited by the centering shaft to avoid the reinforcing ring mold being in a suspended state and offset, so that the reinforcing ring mold is relatively firmly located in the circumferential three-claw mold. The present invention can lay the preform first and then form the whole body through the assembled mold, reducing the deformation caused by the density difference of each component, thereby improving the yield rate of the lens barrel bracket, that is, solving the problem that the existing lens barrel bracket components are usually prepared separately for each component to a certain density, and then assembled and riveted, resulting in large deformation of the parts and poor assembly processability.

[0043] (2) The inner ring flanging inner mold and the fixed disc inner mold of the present invention are separate molds, and the inner ring pressing outer mold serves to connect the inner ring flanging inner mold and the fixed disc inner mold. In addition, since the inner ring preform will rotate to a certain extent in the inner ring flanging inner mold, the present invention provides an inner ring pressing outer mold to limit the edge of the inner ring preform and reduce the degree of deformation of the inner ring preform during the forming process.

[0044] (3) The present invention provides a pulling and closing assembly so that the outer mold of the three-claw reinforcement plate is not easily offset from the first back plate and the second back plate, and at the same time provides a certain pressing force to the three-claw reinforcement plate preform, thereby improving the forming accuracy of the three-claw reinforcement plate preform and the three-claw preform. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 Schematic diagram of the structure of the lens barrel bracket prefabricated body.

[0046] Figure 2 It is a structural schematic diagram of the C / SiC composite material lens barrel bracket forming mold of the present invention.

[0047] Figure 3 It is a structural schematic diagram of the inner ring shaping base of the present invention.

[0048] Figure 4 It is a structural schematic diagram of the reinforcement ring mold of the present invention.

[0049] Figure 5 It is a structural schematic diagram of the positioning shaft of the present invention.

[0050] Figure 6 It is a structural schematic diagram of the limiting separation component of the present invention.

[0051] Figure 7 It is a structural schematic diagram of the circumferential three-claw mold of the present invention.

[0052] Figure 8 It is a structural schematic diagram of the inner ring pressing outer mold of the present invention.

[0053] Figure 9 It is a structural schematic diagram of the radial pulling and closing assembly of the present invention.

[0054] Figure 10 This is a structural schematic diagram of the inner ring flanging inner mold of the present invention when flanging is performed.

[0055] In the figure: 1-inner ring shaping base; 101-inner ring flanging inner mold; 102-fixed disc inner mold; 103-limiting boss; 104-shaping boss; 21-first shaping arm; 22-second shaping arm; 23-third shaping arm; 24-three-claw preform molding cavity; 201-first back plate; 202-second back plate; 203-arc plate; 204-connecting boss; 205-fourth fastener; 206-arc flange plate; 3-reinforcement ring mold; 301-positioning shaft; 4-centering shaft; 5-inner ring pressing outer mold ;501-second fastener; 502-third fastener; 6-three-claw reinforcement plate outer mold; 601-fifth fastener; 7-radial pulling assembly; 701-first pulling plate; 702-second pulling plate; 703-sixth fastener; 8-limiting partition assembly; 801-limiting cover plate; 802-limiting insert; 901-reinforcement ring preform; 902-three-claw preform; 903-inner ring preform; 904-three-claw reinforcement plate preform; 11-I-shaped metal pad; 12-C-type graphite pad; 13-metal aluminum ring. DETAILED DESCRIPTION

[0056] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0057] Please refer to Figure 1 The lens barrel bracket preform includes a reinforcement ring preform 901 formed by laying carbon cloth, a three-claw preform 902, an inner ring preform 903 and a three-claw reinforcement plate preform 904. The three-claw preform 902 includes three arms, and the angle between the arms in the circumferential direction is 120°. The top ends of the three arms are attached to each other and a cavity is reserved. The reinforcement ring preform 901 is embedded in the cavity; the bottom ends of the three arms are away from each other so that the three-claw preform 902 has an open structure. The bottom ends of the three arms are connected to the inner ring preform 903, and the outer sides of the three arms are respectively provided with three-claw reinforcement plate preforms 904.

[0058] Please refer to Figure 2A C / SiC composite lens barrel bracket forming mold, which includes an inner ring shaping base 1, a circumferential three-claw mold, a reinforcement ring mold 3 and a centering shaft 4. The inner ring shaping base 1 includes a shaping surface and a placement surface. The circumferential three-claw mold is provided with a three-claw preform shaping cavity 24 for laying a three-claw preform 902. The centering shaft 4 is vertical, and the top of the centering shaft 4 is embedded with a reinforcement ring mold 3, so that the reinforcement ring mold 3 is located at the top of the three-claw preform shaping cavity 24. The bottom end of the centering shaft 4 passes through the three-claw preform shaping cavity 24 and is connected to the middle of the inner ring shaping base 1. The overall shaping mold designed by the present invention is novel in form, reasonable in structure, reliable in process control and reusable, and meets the process requirements of carbon cloth lamination shaping, chemical vapor infiltration and other process processes in the forming process of continuous fiber reinforced ceramic matrix composite components. The formed C / SiC composite lens barrel bracket has excellent performance, high overall strength and stability, and meets product performance requirements.

[0059] Please refer to Figure 3 The inner ring shaping base 1 includes an inner ring flanging inner mold 101 and a fixed disc inner mold 102. The inner ring flanging inner mold 101 is arranged above the fixed disc inner mold 102. The diameter of the inner ring flanging inner mold 101 is smaller than the diameter of the fixed disc inner mold 102. A limiting boss 103 is provided in the middle of the inner ring flanging inner mold 101. A plurality of shaping bosses 104 are provided at intervals on the circumferential outer edge of the inner ring flanging inner mold 101. In this embodiment, according to the shape of the inner ring preform 903 after flanging, this embodiment is provided with three shaping bosses 104 for shaping the inner ring preform 903. Both the limiting boss 103 and the fixed disc inner mold 102 are provided with an axial hole for connecting the centering shaft 4. The shape of the axial hole matches the bottom end structure of the centering shaft 4.

[0060] Please refer to Figure 4 and Figure 5 The top of the centering shaft 4 is machined with a stepped hole. The reinforcement ring mold 3 is a hollow structure. The bottom end of the reinforcement ring mold 3 is embedded in the stepped hole. The reinforcement ring mold 3 is penetrated by a positioning shaft 301. The bottom end of the positioning shaft 301 is also embedded in the stepped hole of the centering shaft 4. The top end of the positioning shaft 301 extends out of the reinforcement ring mold 3 and is provided with a limited separation component 8. The inner ring preform 903 is flanged by the inner ring flanging inner mold 101 and then fixed by the fixed disc inner mold 102, thereby shaping the inner ring preform 903. The bottom end of the centering shaft 4 extends into the limiting boss 103 and is embedded in the axial hole of the fixed disc inner mold 102, so that the centering shaft 4 firmly supports the reinforcement ring mold 3. The inner ring shaping base 1 of the present invention plays the role of shaping the inner ring preform 903.

[0061] Please refer to Figure 6The limiting and separating assembly 8 includes a limiting cover plate 801 and three limiting inserts 802 arranged on the outer circumference of the limiting cover plate 801. The limiting cover plate 801 is provided with a through hole for connecting to the positioning shaft 301. The top ends of the limiting inserts 802 are connected to the limiting cover plate 801, and the bottom ends of the limiting inserts 802 extend into the three-claw preform molding cavity 24, thereby separating the reinforcing ring mold 3 from the corresponding support arm. The arrangement of the centering shaft 4, the positioning shaft 301, and the limiting and separating assembly 8 ensures the accuracy of the preform positioning during multiple disassembly and assembly, as well as heating and cooling processes, effectively reducing the risk of deformation of the composite material preform during the process, and achieving the production of a complete lens barrel bracket product.

[0062] Please refer to Figure 7 The circumferential three-claw mold includes a first shaping arm 21, a second shaping arm 22 and a third shaping arm 23 arranged along the circumferential direction of the shaping surface. The first shaping arm 21, the second shaping arm 22 and the third shaping arm 23 all include a first back plate 201, a second back plate 202 and an arc plate 203 connecting the first back plate 201 and the second back plate 202. The first back plate 201 and the second back plate 202 are both triangular plates. The first back plate 201 and the second back plate 202 are connected to the inner ring flanging inner mold 101 and the fixed disc inner mold 102 through a first fastener. The first back plate 201 and the second back plate 202 are provided with 12 in the circumferential direction. The angle between the first and second back plates 201 and 202 is 0 degrees, the first back plate 201 and the second back plate 202 are buckled on the corresponding shaping boss 104, and the outer sides of the first back plate 201 and the second back plate 202 are provided with a connecting boss 204. The first back plates 201 and the second back plates 202 of adjacent shaping arms are arranged relative to each other, that is, the first back plate 201 of the first shaping arm 21 and the second back plate 202 of the second shaping arm 22 are arranged relative to each other, the second back plate 202 of the first shaping arm 21 and the first back plate 201 of the third shaping arm 23 are arranged relative to each other, and the first back plate 201 of the second shaping arm 22 and the second back plate 202 of the third shaping arm 23 are arranged relative to each other. The corresponding first backplate 201 and the second backplate 202 are connected to the corresponding connecting bosses 204 respectively through the fourth fasteners 205, wherein a pad is arranged between the first backplate 201 and the second backplate 202, and the fourth fastener 205 is connected to the pad to form three groups of clamping arms, so that a three-claw preform forming cavity 24 is formed between the corresponding first backplate 201, the second backplate 202 and the arc plate 203.

[0063] It is worth noting that the first back plate 201 and the second back plate 202 are connected to the inner ring flange inner mold 101 through the first fastener. The holes on the first back plate 201 and the second back plate 202 for installing the first fastener are not processed when the first back plate 201 and the second back plate 202 are processed, and are assembled after they are assembled into a relative position relationship.

[0064] The present invention is directed to the forming structure of the lens barrel bracket, and an inner ring shaping inner mold is provided to shape and fix the inner ring preform 903. The three-claw preform 902 is an open structure, and there is an angle between the support arms and the top ends of the support arms are connected to each other. The reinforcing ring preform 901 is embedded in the top end of the three-claw preform 902, and the bottom end of each support arm is connected to the inner ring preform 903. Considering that the preform is carbon fiber cloth and is not easy to shape, the present invention provides a first shaping support arm 21, a second shaping support arm 22 and a third shaping support arm 23 to lay and fix the three-claw preform 902, which does not affect the subsequent vapor deposition of the three-claw preform 902 and can also ensure that the three-claw preform The top and bottom ends of the body 902 are respectively connected to the reinforcement ring preform 901 and the inner ring preform 903; the reinforcement ring mold 3 is limited by the centering shaft 4 to prevent the reinforcement ring mold 3 from being in a suspended state and offset, so that the reinforcement ring mold 3 is relatively firmly located in the circumferential three-claw mold. The present invention can first lay the preform and then form the whole through the assembled mold, reducing the deformation caused by the density difference of each component, thereby improving the yield rate of the lens barrel bracket, that is, solving the problem that the existing lens barrel bracket components are usually prepared separately for each part to a certain density, and then assembled and riveted, resulting in large deformation of the parts and poor assembly processability.

[0065] Please refer to Figure 8 The inner ring flanging inner mold 101 is connected to the fixed disc inner mold 102 through multiple inner ring pressing outer molds 5 with a step structure. Multiple inner ring pressing outer molds 5 are staggered and spaced apart with the corresponding shaping arms. In this embodiment, three inner ring pressing outer molds 5 are provided. An inner ring pressing outer mold 5 is respectively provided between the first back plate 201 and the second back plate 202 of the first shaping arm 21, between the first back plate 201 and the second back plate 202 of the second shaping arm 22, and between the first back plate 201 and the second back plate 202 of the third shaping arm 23. The tops of the inner ring pressing outer molds 5 are all buckled with the inner ring flanging inner mold 101 and connected to the inner ring flanging inner mold 101 through the second fastener 501; the bottoms of the inner ring pressing outer molds 5 are all attached to the fixed disc inner mold 102 and connected to the fixed disc inner mold 102 through the third fastener 502. After the first shaping arm 21, the second shaping arm 22 and the third shaping arm 23 are installed on the inner ring flanging inner mold 101, the inner ring pressing outer mold 5 of the step structure is buckled on the inner ring flanging inner mold 101 and the fixed disc inner mold 102 and the second fastener 501 and the third fastener 502 are tightened. The inner ring flanging inner mold 101 and the fixed disc inner mold 102 are separate molds, and the inner ring pressing outer mold 5 serves to connect the inner ring flanging inner mold 101 and the fixed disc inner mold 102. In addition, since the inner ring preform 903 will rotate to a certain extent in the inner ring flanging inner mold 101, the present invention provides an inner ring pressing outer mold 5 to limit the edge of the inner ring preform 903 and reduce the degree of deformation of the inner ring preform 903 during the molding process.

[0066] It also includes a three-claw reinforcement plate outer mold 6, the bottom of the first back plate 201 and the second back plate 202 are respectively provided with an arc flange plate 206 that fits with the inner ring flanging inner mold 101, the outer side of the clamping arm is provided with a three-claw reinforcement plate outer mold 6, the fixed disc inner mold 102 is provided with a card slot for clamping the three-claw reinforcement plate outer mold 6, the bottom of the three-claw reinforcement plate outer mold 6 is connected to the fixed disc inner mold 102 through the fifth fastener 601, and the top of the three-claw reinforcement plate outer mold 6 is connected to the inner ring flanging inner mold 101 through the radial pulling component 7. The outer edge of the three-claw preform 902 is also provided with a three-claw reinforcement plate preform 904. After the first shaping arm 21, the second shaping arm 22, and the third shaping arm 23 are fixed to the inner ring flange inner mold 101, the three-claw reinforcement plate preform 904 is formed by laying the outer side of the arc flange plate 206. The three-claw reinforcement plate outer mold 6 is embedded in the slot, the fifth fastener 601 is tightened, and the radial tension assembly 7 is installed. The three-claw reinforcement plate outer mold 6 is simply sewn with the corresponding shaping arm. After the first shaping arm 21, the second shaping arm 22, and the third shaping arm 23 are installed, the corresponding three-claw reinforcement plate outer mold 6 is installed respectively, so that the three-claw reinforcement plate preform 904 can be integrally formed with the three-claw preform 902.

[0067] Please refer to Figure 9 The radially closing assembly 7 includes a first closing plate 701, a second closing plate 702, and a sixth fastener 703 connecting the first and second closing plates 701, 702. The first closing plate 701 is positioned inside the shaping boss 104, and the second closing plate 702 is positioned outside the three-jaw reinforcement plate outer mold 6. In this embodiment, two sixth fasteners 703 are provided, and the two sixth fasteners 703 are located on either side of the three-jaw reinforcement plate outer mold 6. The first and second closing plates 701, 702 are placed inside the shaping boss 104 and outside the three-jaw reinforcement plate outer mold 6, respectively. The positions and heights of the first and second closing plates 701, 702 are adjusted, and the sixth fastener 703 sequentially connects the second and first closing plates 702. The pulling and closing assembly provided in the present invention can prevent the three-claw reinforcement plate outer mold 6 from being offset from the first back plate 201 and the second back plate 202, and at the same time provide a certain pressing force to the three-claw reinforcement plate preform 904, thereby improving the forming accuracy of the three-claw reinforcement plate preform 904 and the three-claw preform 902.

[0068] In this embodiment, the first fastening member, the second fastening member 501 , the third fastening member 502 , the fourth fastening member 205 , the fifth fastening member 601 and the sixth fastening member 703 are all bolts.

[0069] A method for manufacturing a lens barrel bracket using a C / SiC composite lens barrel bracket forming mold

[0070] S1: Design the preform of the lens barrel bracket according to the product size of the lens barrel bracket, mainly including the wall thickness and contour processing allowance of the lens barrel bracket preform. In this embodiment, the contour processing allowance is 15-20 mm, and the number of preform winding layers = (preform wall thickness / single-layer plain carbon cloth thickness) ± 1 layer;

[0071] S2: Based on the designed lens barrel bracket preform, design the C / SiC composite lens barrel bracket forming mold, including the mold half form, wall thickness, connection and positioning method;

[0072] S3: According to the fitting relationship between the mold and each preform, holes are punched on the fitting surface between the mold and the preform, with a hole diameter of 5mm and a hole center distance of 10mm;

[0073] The specific punching method is as follows: first, make the sewing holes of the inner ring flanging inner mold 101 separately according to the general punching process, then reset the inner ring flanging inner mold 101 with the holes to the corresponding position of the forming mold, use a white marker to pass through the sewing holes, and mark the sewing holes on the use molding surface of each adjacent mold of the inner ring flanging inner mold 101, then make the marked sewing holes of the adjacent molds separately according to the general punching process, and reset the mold again, use a white marker to mark the sewing holes of the adjacent molds, and so on, until the sewing holes of all molds are made. The sewing holes are conducive to gas and liquid phase mass transfer, and ensure the pressing force of the preform in the entire composite material forming process. Therefore, the integral forming mold is not only suitable for the densification of the laminated carbon fiber preform CVI process method, but also suitable for the densification of the PIP (precursor impregnation-pyrolysis) process method, which has certain guiding significance for the manufacturing technology of continuous fiber reinforced ceramic matrix composites.

[0074] S4: sewing and shaping the lens barrel bracket prefabricated body into the forming mold;

[0075] S41: After the inner ring preform 903 is flanging-processed, the inner ring preform 903 is sewn onto the inner ring flanging inner mold 101 and the fixed disc inner mold 102 using a needle with T300-3K carbon fiber, and the excess fabric of the flanging is cut off, leaving enough for locking the edges, sewing from the middle of the inner ring arc surface to both ends, sewing along the circumferential direction, then sewing the flanging, sewing along the circumferential direction, and finally locking the edges.

[0076] Please refer to Figure 10In this embodiment, the inner ring flanging inner mold 101 is used in conjunction with the I-shaped metal pad 11 and the C-shaped graphite pad 12 for flanging processing. The flanging processing process is as follows: (1) the I-shaped metal pad 11 is placed under the inner ring flanging inner mold 101, and 6 C-shaped graphite pads 12 are evenly distributed along the circumference of the inner ring flanging inner mold 101. Then, the metal aluminum ring 13 is put on the outside of the wound inner ring preform 903 and placed on the upper surface of the 6 C-shaped graphite pads 12 to achieve flanging height positioning; (2) flanging is started, and the first Use transparent tape to stick the flanged and patched carbon cloth together in one layer, and then use solid glue to stick each layer of flanged carbon cloth together. When flanging, the cut position is divided into 6 parts along the circumference, and the cuts are staggered layer by layer to evenly stagger the cuts; 3) After the inner ring preform 903 is laid, the positioning pins and bolts between the inner ring flanging inner mold 101 and the fixed disc inner mold 102 are connected, and the inner ring shaping base 1 is flipped 180° as a whole, where the sum of the heights of the C-shaped graphite pad 12 and the metal aluminum ring 13 is the flanging height of the inner ring preform 903.

[0077] S42: Carbon cloth is laid on the first shaping arm 21, the second shaping arm 22, and the third shaping arm 23, respectively. That is, carbon cloth is laid on the first back plate 201, the second back plate 202, and the curved plate 203 and bonded using stick glue. In this embodiment, the thickness of the three-claw preform 902 is (2.4 / 0.17) ± 1 = 14 ± 1 layers.

[0078] S43: The reinforcement ring preform 901 is wound and shaped in the reinforcement ring mold 3, leaving space for the positioning shaft 301 (the positioning shaft 301 can be inserted in advance during sewing). In this embodiment, the layer thickness of the reinforcement ring preform 901 is (2.9 / 0.17) ± 1 = 17 ± 1 layers;

[0079] S44: Connect the bottom end of the centering shaft 4 to the limiting boss 103, and then embed the reinforcement ring mold 3 on the top end of the centering shaft 4;

[0080] S45: Place the first shaping support arm 21, the second shaping support arm 22, and the third shaping support arm 23 on the inner ring shaping base 1 and gradually push them toward the center of the inner ring shaping base 1 until the corresponding preforms on the first back plate 201 and the second back plate 202 are attached to each other and the fourth fastener 205 is tightened; lay carbon cloth on the three-claw reinforcement plate outer mold 6, perform simple locking, and install the three-claw reinforcement plate outer mold 6 on the fixed disc inner mold 102 and connect them to the corresponding clamping arms;

[0081] S46: Sew the three-claw preform 902, the reinforcement ring preform 901, the inner ring preform 903 and the three-claw reinforcement plate preform 904 as a whole, and the overall sewing adopts the through-sewing method; install the limiting separation component 8, the inner ring pressing outer mold 5 and the radial pulling component 7.

[0082] S5: placing the lens barrel bracket preform together with the forming mold into a chemical vapor deposition furnace for deposition treatment. When the lens barrel bracket preform is deposited to a certain density, the lens barrel bracket preform is mechanically processed.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A C / SiC composite material lens barrel bracket forming die, characterized in that: include: Inner ring shaping base (1), circumferential three-claw mold, reinforcement ring mold (3) and centering shaft (4); The inner ring shaping base (1) comprises a shaping surface and a placement surface, the circumferential three-claw mold comprises a first shaping support arm (21), a second shaping support arm (22) and a third shaping support arm (23) arranged along the circumferential direction of the shaping surface, the bottoms of the first shaping support arm (21), the second shaping support arm (22) and the third shaping support arm (23) are all buckled on the shaping surface and connected to the inner ring shaping base (1); the first shaping support arm (21), the second shaping support arm (22) and the third shaping support arm (23) are connected to each other in pairs to form a three-claw preform molding cavity (24); The centering shaft (4) is vertical, the top end of the centering shaft (4) is embedded with the reinforcement ring mold (3), and the reinforcement ring mold (3) is located at the top of the three-claw preform molding cavity (24), and the bottom end of the centering shaft (4) passes through the three-claw preform molding cavity (24) and is connected to the inner ring shaping base (1); The inner ring shaping base (1) comprises an inner ring flanging inner mold (101) and a fixed disc inner mold (102), wherein the inner ring flanging inner mold (101) is arranged above the fixed disc inner mold (102), a limiting boss (103) is arranged in the middle of the inner ring flanging inner mold (101), and a plurality of shaping bosses (104) are arranged at intervals on the circumferential outer edge of the inner ring flanging inner mold (101); the limiting boss (103) and the fixed disc inner mold (102) are both provided with an axial hole for connecting the centering shaft (4); The first shaping support arm (21), the second shaping support arm (22) and the third shaping support arm (23) each comprise a first back plate (201), a second back plate (202) and an arc-shaped plate (203) connecting the first back plate (201) and the second back plate (202); an angle is provided between the first back plate (201) and the second back plate (202); the first back plate (201) and the second back plate (202) are buckled onto corresponding shaping bosses (104); and connecting bosses (204) are provided on the outer sides of the first back plate (201) and the second back plate (202); The first back plate (201) and the adjacent second back plate (202) are arranged relative to each other, and the connecting boss (204) between the first back plate (201) and the second back plate (202) arranged relative to each other are connected via a fourth fastener (205).

2. The C / SiC composite material lens barrel bracket forming die according to claim 1, characterized in that: The diameter of the inner ring flanging inner mold (101) is smaller than the diameter of the fixed disc inner mold (102), and the inner ring flanging inner mold (101) is connected to the fixed disc inner mold (102) through multiple inner ring pressing outer molds (5) with a step structure; the top of the inner ring pressing outer mold (5) is buckled with the inner ring flanging inner mold (101) and connected to the inner ring flanging inner mold (101) through a second fastener (501); the bottom of the inner ring pressing outer mold (5) is affixed to the fixed disc inner mold (102) and connected to the fixed disc inner mold (102) through a third fastener (502).

3. The C / SiC composite material lens barrel bracket forming die according to claim 1, characterized in that: The invention also includes a three-claw reinforcement plate outer mold (6), the bottoms of the first back plate (201) and the second back plate (202) are respectively provided with arc flange plates (206) that fit with the inner ring flanging inner mold (101), the fixed disc inner mold (102) is provided with a clamping groove for clamping the three-claw reinforcement plate outer mold (6), the bottom of the three-claw reinforcement plate outer mold (6) is connected to the fixed disc inner mold (102) through a fifth fastener (601), and the top of the three-claw reinforcement plate outer mold (6) is connected to the inner ring flanging inner mold (101) through a radial pulling assembly (7).

4. The C / SiC composite material lens barrel bracket forming die according to claim 3, characterized in that: The radial closing assembly (7) comprises a first closing plate (701), a second closing plate (702), and a sixth fastener (703) connecting the first closing plate (701) and the second closing plate (702); the first closing plate (701) is arranged on the inner side of the shaping boss (104); and the second closing plate (702) is arranged on the outer side of the three-claw reinforcement plate outer mold (6).

5. The C / SiC composite material lens barrel bracket forming die according to any one of claims 1 to 4, characterized in that: The reinforcement ring mold (3) is a hollow structure, and a positioning shaft (301) is connected through the reinforcement ring mold (3), the bottom end of the positioning shaft (301) is embedded in the centering shaft (4), and the top end of the positioning shaft (301) extends out of the reinforcement ring mold (3) and is provided with a limited separation component (8).

6. The C / SiC composite material lens barrel bracket forming die according to claim 5, characterized in that: The limiting separation component (8) comprises a limiting cover plate (801) and three limiting inserts (802) arranged on the outer edge of the circumference of the limiting cover plate (801), the limiting cover plate (801) is connected to the positioning shaft (301), the top ends of the limiting inserts (802) are connected to the limiting cover plate (801), and the bottom ends of the limiting inserts (802) are extended into the three-claw preform molding cavity (24), thereby separating the reinforcement ring mold (3) from the corresponding positioning support arm.

7. A method for manufacturing a lens barrel bracket using the C / SiC composite lens barrel bracket forming mold according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: Design of prefabricated body of lens barrel bracket; S2: Design the C / SiC composite lens barrel bracket forming mold; S3: punching holes in the forming mold; S4: sewing and shaping the lens barrel bracket prefabricated body into the forming mold; S5: placing the lens barrel bracket preform together with the forming mold into a chemical vapor deposition furnace for deposition treatment. When the lens barrel bracket preform is deposited to a certain density, the lens barrel bracket preform is mechanically processed.

8. The method for manufacturing a lens barrel bracket using a C / SiC composite lens barrel bracket forming die according to claim 7, characterized in that: In step S4, sewing and shaping the lens barrel bracket prefabricated body includes the following steps: S41: flanging the inner ring preform and shaping and sewing it to the inner ring shaping base (1); S42: laying a three-claw preform on the first shaping support arm (21), the second shaping support arm (22), and the third shaping support arm (23); S43: Winding the reinforcement ring preform on the reinforcement ring mold (3); S44: Connecting the bottom end of the centering shaft (4) to the inner ring shaping base (1), and then embedding the reinforcement ring mold (3) on the top end of the centering shaft (4); S45: placing the first shaping support arm (21), the second shaping support arm (22), and the third shaping support arm (23) on the inner ring shaping base (1) and gradually pushing them toward the center of the inner ring shaping base (1); S46: Sewing the three-claw preform and the reinforcement ring preform integrally with corresponding molds.

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