Connection method and connection structure of ceramic matrix composite lens cone and optical instrument

Abstract

The invention discloses a method for connecting a ceramic-based composite material lens cone and an optical instrument. The method comprises the following steps: S1, forming a mounting hole in a mounting interface surface of the composite material lens cone; s2, performing finish machining on the mounting interface surface of the composite lens cone; s3, the connecting stand columns on the lower surface of the metal patch are inserted into the mounting holes; s4, locking the connecting stand column by adopting a locking nut, and fastening the metal patch on the mounting interface surface; the method comprises the following steps: S1, mounting a metal patch on the upper surface of the composite lens barrel, S5, carrying out finish machining on the upper surface provided with the metal patch, S6, further machining the upper surface of the metal patch by adopting a manual scraping mode, and S7, connecting the composite lens barrel and an optical instrument through matching of a screw and a threaded blind hole reserved in the metal patch. According to the invention, the mounting interface surface provided with the metal patch is processed and ground, so that the mounting precision of the composite lens cone and the optical instrument is improved, and the mounting precision requirement of the related interface of the high-precision satellite optical machine is met.

Description

Technical Field

[0001] The invention relates to the technical field of ceramic-based composite materials, and in particular to a method for connecting a ceramic-based composite material lens barrel and an optical instrument and a connecting structure thereof. Background Art

[0002] Ceramic-based composites are a new type of thermal structural / functional integrated material that combines the performance advantages of metal materials, ceramic materials and carbon materials. They have the characteristics of high temperature resistance, low density, high specific strength, high specific modulus, oxidation resistance, ablation resistance, insensitivity to cracks, and no catastrophic damage. They are widely used in machinery, aerospace, nuclear, energy and other fields.

[0003] Satellite optical components made of ceramic matrix composite materials are widely used in the aerospace field due to their low density and good stability in high and low temperature environments. At the same time, ceramic matrix composite materials have high hardness and are difficult to process. After the preparation of the composite barrel, the dimensional accuracy of the product installation surface is poor. After it is directly connected to the optical instrument and installed, it is difficult to meet the installation accuracy requirements of the ultra-high precision satellite optical machine related interfaces.

[0004] At the same time, the previous threaded connection method of screws and nuts can easily cause tiny particles to enter the interior of related optical components, causing a decrease in product accuracy and stability during subsequent use. Summary of the invention

[0005] In view of the above problems in the prior art, the present invention provides a method and a connection structure for connecting a ceramic-based composite lens barrel with an optical instrument, which solves the problem that after the existing composite lens barrel is prepared, it is difficult to meet the installation accuracy requirements when docking and installing it with the optical instrument.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] On the one hand, a method for connecting a ceramic matrix composite material lens barrel and an optical instrument is provided, which comprises the following steps:

[0008] Step S1, determining the installation position of the metal patch on the installation interface surface of the composite lens barrel, and opening a mounting hole at the installation position;

[0009] Step S2, fine-machining the mounting interface surface of the composite lens barrel so that the flatness of the mounting interface surface is less than 0.1 mm;

[0010] Step S3, inserting the connection column on the lower surface of the metal patch into the mounting hole, and using an adhesive to bond the mounting interface surface and the lower surface of the metal patch;

[0011] Step S4, using a locking nut to lock the connecting column, and fasten the metal patch to the installation interface surface;

[0012] Step S5, finishing the upper surface of the metal patch so that the flatness of the upper surface of the metal patch is less than 0.1 mm;

[0013] Step S6, scraping and grinding the upper surface of the metal patch until the flatness of the upper surface of the metal patch is less than 0.005 mm;

[0014] Step S7, connecting the composite lens barrel and the optical instrument by means of the screws and the threaded blind holes reserved on the metal patch;

[0015] On the other hand, a connection structure between a ceramic-based composite material lens barrel and an optical instrument is provided, which includes a metal patch, and two connecting columns are arranged on the lower surface of the metal patch. The two connecting columns are embedded in mounting holes reserved on the mounting interface surface of the composite lens barrel and are movably fixed; a threaded blind hole is opened on the upper surface of the metal patch, and the threaded blind hole is coaxial with the connecting column.

[0016] Furthermore, a locking nut is sleeved on the connecting column, and a gasket is arranged between the locking nut and the composite lens barrel.

[0017] Furthermore, an external thread is provided on the connecting column, and the length of the external thread is greater than the sum of the thicknesses of the locking nut and the gasket.

[0018] Furthermore, the difference between the outer diameter of the gasket and the diameter of the connecting column is greater than or equal to 8 mm.

[0019] Furthermore, the difference between the diameter of the connecting column and the diameter of the threaded blind hole is greater than or equal to 3 mm.

[0020] Furthermore, the thickness of the metal patch is greater than or equal to 2 mm.

[0021] The invention discloses a method and a connection structure of a ceramic-based composite material lens barrel and an optical instrument, and the beneficial effects are:

[0022] 1. The present invention improves the installation accuracy of the composite lens barrel and the optical instrument by bonding and fixing the metal patch on the installation interface surface of the composite lens barrel and processing and grinding the installation interface surface with the metal patch installed, thereby meeting the installation accuracy requirements of high-precision satellite optical machine related interfaces.

[0023] 2. The metal patch in the present invention is locked with a locking nut to connect the column, thereby reducing the impact of vibration during the subsequent grinding process and preventing the metal patch from falling off and causing product rework.

[0024] 3. The present invention adopts a threaded blind hole at the center of the connecting column to prevent the problem of tiny particles entering the interior of related optical components due to thread friction during the subsequent tightening process of the metal screw, thereby ensuring the accuracy and stability of the product during subsequent use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is a schematic structural diagram of a connection structure between a ceramic-based composite material lens barrel and an optical instrument.

[0026] Figure 2 For the present invention Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle.

[0027] Figure 3 For the present invention Figure 2 Schematic diagram of the enlarged structure at point B in the middle.

[0028] Among them, 1. Composite lens barrel; 2. Mounting interface surface; 3. Metal patch; 4. Connecting column; 5. Locking nut; 6. Threaded blind hole; 7. Gasket. DETAILED DESCRIPTION

[0029] The specific embodiments of the present invention are described to facilitate those skilled in the art to understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0030] Example 1

[0031] This embodiment provides a method for connecting a ceramic matrix composite lens barrel with an optical instrument, the purpose of which is to solve the problem that it is difficult to achieve the installation accuracy requirement when the existing composite lens barrel is connected to the optical instrument after being prepared. Figure 1-Figure 3 , the connection method in this embodiment will be described in detail below.

[0032] A method for connecting a ceramic matrix composite material lens barrel and an optical instrument, comprising the following steps:

[0033] Step S1, determining the installation position of the metal patch 3 on the installation interface surface 2 of the composite lens barrel 1, and opening a mounting hole at the installation position;

[0034] In this embodiment, the metal patch 3 needs to be prefabricated in advance, and the shape and size of the metal patch 3 are determined. The metal patch 3 and the two connecting columns 4 on its lower surface can be formed integrally. The positions of the two connecting columns 4 on the lower surface of the metal patch 3 can be set according to the installation position of the optical instrument to be connected, and then the number of metal patches 3 is determined according to the installation position of the optical instrument to be connected, thereby determining the installation position and number of the metal patch 3 on the installation interface surface 2 of the composite lens barrel 1. After the determination is made, holes are opened on the installation position of the metal patch 3 based on the positions of the two connecting columns 4 to form installation holes for the connecting columns 4.

[0035] Step S2, fine-machining the mounting interface surface 2 of the composite lens barrel 1, so that the flatness of the mounting interface surface 2 is less than 0.1 mm;

[0036] In this embodiment, the mounting interface surface 2 of the composite lens barrel 1 needs to be finely processed in advance to improve the bonding effect between the mounting interface surface 2 of the composite lens barrel 1 and the metal patch 3 .

[0037] Step S3, inserting the connection column 4 on the lower surface of the metal patch 3 into the mounting hole, and using an adhesive to bond the mounting interface surface 2 and the lower surface of the metal patch 3;

[0038] In this embodiment, adhesive is applied on the upper surface of the installation interface surface 2, the lower surface of the metal patch 3 and the external thread of the connecting column 4. The adhesive can be J133 glue. The function of J133 glue is to play a bonding and anti-loosening role on the one hand; on the other hand, due to the low surface accuracy of the composite material, it plays a slight filling and repairing role on the lower surface of the metal patch 3.

[0039] Step S4, using the locking nut 5 to lock the connecting column 4, and fasten the metal patch 3 to the installation interface surface 2;

[0040] In this embodiment, the connecting column 4 is fixed in the mounting hole by the locking nut 5, thereby fixing the metal patch 3 on the mounting interface surface 2, reducing the impact of vibration during the subsequent grinding process and preventing the metal patch 3 from falling off and causing product rework.

[0041] Step S5, finishing the upper surface of the metal patch 3 so that the flatness of the upper surface of the metal patch 3 is less than 0.1 mm;

[0042] Step S6, scraping and grinding the upper surface of the metal patch 3 by manual scraping until the flatness of the upper surface of the metal patch 3 is less than 0.005 mm;

[0043] Step S7, connecting the composite lens barrel 1 and the optical instrument by means of the cooperation between the screws and the threaded blind holes 6 reserved on the metal patch 3.

[0044] Example 2

[0045] This embodiment provides a connection structure between a ceramic matrix composite lens barrel and an optical instrument, the purpose of which is to solve the problem that it is difficult to achieve the installation accuracy requirements when the existing composite lens barrel is connected to the optical instrument after being prepared. Figure 1-Figure 3 , the connection structure in this embodiment will be described in detail below.

[0046] A connection structure between a ceramic-based composite material lens barrel and an optical instrument, comprising a metal patch 3.

[0047] Among them, two connecting columns 4 are arranged on the lower surface of the metal patch 3, and the two connecting columns 4 are embedded in the mounting holes reserved on the mounting interface surface 2 of the composite lens barrel 1 and are movably fixed; a threaded blind hole 6 is opened on the upper surface of the metal patch 3, and the threaded blind hole 6 is coaxial with the connecting column 4.

[0048] In this embodiment, the threaded blind hole 6 is formed on the connecting column 4. When making the threaded blind hole 6, a threaded bottom hole needs to be made first, and the depth of the threaded bottom hole = the thread depth of the threaded blind hole 6 + 2 mm. The bottom surface of the threaded bottom hole is greater than or equal to 1 mm from the external thread of the connecting column 4, and the threaded blind hole 6 is coaxial with the external thread of the connecting column 4.

[0049] The metal patch 3 is bonded to the mounting interface surface 2 of the composite lens barrel 1 by adhesive, and the metal patch 3 is movably fixed, so that the mounting interface surface 2 with the metal patch 3 is processed and ground to improve the flatness of the mounting interface surface 2, thereby improving the installation accuracy of the composite lens barrel 1 and the optical instrument, and meeting the installation accuracy requirements of high-precision satellite optical machine related interfaces.

[0050] Specifically, the locking nut 5 is sleeved on the connecting column 4 , and a gasket 7 is provided between the locking nut 5 and the composite lens barrel 1 .

[0051] In this embodiment, after the connecting column 4 passes through the pre-opened mounting hole on the mounting interface surface 2, it is locked and fixed by the locking nut 5, and the locking strength of the locking nut 5 is increased by the gasket 7, so that the metal patch 3 is effectively fixed on the mounting interface surface 2, reducing the impact of vibration during the subsequent grinding process on the mounting interface surface 2, and preventing the metal patch 3 from falling off, causing product rework.

[0052] Specifically, an external thread is formed on the connecting column 4 , and the length of the external thread is greater than the sum of the thicknesses of the locking nut 5 and the gasket 7 .

[0053] In this embodiment, the length of the external thread differs from the sum of the thicknesses of the locking nut 5 and the gasket 7 by 0mm-1mm, that is, the size of the locking nut 5 protruding from the connecting column 4 is 0mm-1mm, thereby ensuring that the locking nut 5 and the gasket 7 are completely inserted into the connecting column 4, ensuring the strength of the metal patch 3 fastened to the mounting interface surface 2.

[0054] Specifically, the difference between the outer diameter of the gasket 7 and the diameter of the connecting column 4 is greater than or equal to 8 mm.

[0055] In this embodiment, the gasket 7 is circular, and the outer diameter of the circular gasket 7 is ≥ the diameter of the connecting column 4 + 8 mm, so as to ensure the contact area of ​​the gasket 7 and prevent the periphery of the mounting hole on the composite lens barrel 1 from being crushed after being stressed.

[0056] Specifically, the difference between the diameter of the connecting column 4 and the diameter of the threaded blind hole 6 is greater than or equal to 3 mm.

[0057] In this embodiment, the diameter of the connecting column 4 is greater than or equal to the diameter of the threaded blind hole 6 + 3 mm, so as to ensure the strength of the threaded blind hole 6 .

[0058] Specifically, the thickness of the metal patch 3 is greater than or equal to 2 mm.

[0059] In this embodiment, the thickness of the metal patch 3 is ≥2 mm, ensuring that the subsequent surface processing and grinding of the metal patch 3 will not be too large due to the excessive local flatness of the mounting interface surface 2 on the composite lens barrel 1, resulting in the metal patch 3 being too thin and affecting the structural strength.

[0060] Although the specific implementation of the invention is described in detail in conjunction with the drawings, it should not be understood as limiting the scope of protection of this patent. Within the scope described in the claims, various modifications and variations that can be made by those skilled in the art without creative work still fall within the scope of protection of this patent.

Claims

1. A method for connecting a ceramic matrix composite lens barrel and an optical instrument, characterized in that: The following steps are involved: Step S1, determining the installation position of the metal patch (3) on the installation interface surface (2) of the composite lens barrel (1), and opening a mounting hole at the installation position; Step S2, fine-machining the mounting interface surface (2) of the composite lens barrel (1) so that the flatness of the mounting interface surface (2) is less than 0.1 mm; Step S3, inserting the connection column (4) on the lower surface of the metal patch (3) into the mounting hole, and using an adhesive to bond the mounting interface surface (2) and the lower surface of the metal patch (3); Step S4, using a locking nut (5) to lock the connecting column (4) and fasten the metal patch (3) to the installation interface surface (2); Step S5, fine-processing the upper surface of the metal patch (3) so that the flatness of the upper surface of the metal patch (3) is less than 0.1 mm; Step S6, scraping and grinding the upper surface of the metal patch (3) until the flatness of the upper surface of the metal patch (3) is less than 0.005 mm; Step S7: Connect the composite lens barrel (1) and the optical instrument by means of the screws cooperating with the threaded blind holes (6) reserved on the metal patch (3).

2. A connection structure between a ceramic matrix composite lens barrel and an optical instrument, characterized in that: The invention comprises a metal patch (3), wherein the lower surface of the metal patch (3) is provided with two connecting columns (4), and the two connecting columns (4) are embedded in mounting holes reserved on the mounting interface surface (2) of the composite lens barrel (1) and are movably fixed; and the upper surface of the metal patch (3) is provided with a threaded blind hole (6), and the threaded blind hole (6) is coaxial with the connecting column (4).

3. The connection structure of the ceramic matrix composite material lens barrel and the optical instrument according to claim 1, characterized in that: The connection column (4) is sleeved with a locking nut (5), and a gasket (7) is provided between the locking nut (5) and the composite lens barrel (1).

4. The connection structure of the ceramic matrix composite material lens barrel and the optical instrument according to claim 3, characterized in that: The connecting column (4) is provided with an external thread, the length of which is greater than the sum of the thicknesses of the locking nut (5) and the gasket (7).

5. The connection structure of the ceramic matrix composite material lens barrel and the optical instrument according to claim 3, characterized in that: The difference between the outer diameter of the gasket (7) and the diameter of the connecting column (4) is greater than or equal to 8 mm.

6. The connection structure of the ceramic matrix composite material lens barrel and the optical instrument according to claim 4, characterized in that: The difference between the diameter of the connecting column (4) and the diameter of the threaded blind hole (6) is greater than or equal to 3 mm.

7. The connection structure of the ceramic matrix composite material lens barrel and the optical instrument according to claim 5, characterized in that: The thickness of the metal patch (3) is greater than or equal to 2 mm.

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