Multi-diaphragm asymmetric rectangular pyramid load light shield assembly tool and assembly method

Abstract

The invention discloses a multi-diaphragm asymmetric rectangular pyramid load light shield assembly tool and an assembly method, and relates to the field of thin-wall carbon fiber composite material glue joint assembly, the multi-diaphragm asymmetric rectangular pyramid load light shield assembly tool comprises a base, a guide pipe, a supporting column, a datum plate, a pressurization nut and a diaphragm positioning device, the supporting column and the guide pipe are connected to the base, and the top end of the supporting column is used for installing the datum plate; the guide pipe is used for guiding the diaphragm positioning device; the diaphragm positioning device comprises a molded surface, a supporting flange and a lifting rod, the molded surface is matched with the inner molded surface of the body in shape, the outer side surface of the molded surface is connected with the supporting flange, the supporting flange is used for placing a diaphragm, the lifting rod is inserted into the middle of the molded surface, the inner wall of the molded surface is connected with the lifting rod, and the bottom end of the lifting rod is inserted into the guide pipe; the datum plate is provided with a through hole matched with the lifting rod, and the pressurizing nut is in threaded connection with the end of the lifting rod. The problems that an asymmetric rectangular pyramid load light shield structure of an existing multi-diaphragm multi-constraint strong-coupling structure is long in assembling process period, poor in cementing effect, difficult to machine and the like are solved.

Description

Technical Field

[0001] The invention belongs to the field of adhesive bonding assembly of thin-wall carbon fiber composite materials, and is applied to adhesive bonding assembly of variable-section conical-cylinder composite material structures of spacecraft. Background Art

[0002] As an important component of satellite imaging system, the payload light shield can reduce the stray light directly entering the space remote sensor outside the field of view, and limit the sunlight incident at the stray light suppression angle from directly incident on the primary mirror, thereby improving the imaging quality. The multi-aperture multi-constraint strong coupling structure asymmetric tetrahedral payload light shield of the present invention realizes the stray light suppression function from the perspective of optical design, wherein the body and the aperture are high modulus carbon fiber thin-wall composite material structures, such as Figure 1 shown.

[0003] The multi-aperture multi-constraint strong coupling structure asymmetric tetrahedral load light shield includes 1 body and 15 apertures, such as Figure 1 As shown, the body is formed by stacking CCM40J / epoxy carbon fiber composite materials, the working surface of the inner surface of the body is a variable thickness asymmetric tetrahedral box body, the inner surfaces of the four sides of the box body are planes, and the side thickness is divided into a uniform thickness 1mm section and a transition 1-2.8mm uniform thickness section from the top to the root. The outer wall of the small end of the body is connected with a connecting flange, and the connecting flange is provided with a connecting hole. The flange thickness is 4mm, and the opening size of the small end is only 82.4mmx67.4mm; the first reference plane and the second reference plane are determined through the center of the connecting flange and perpendicular to the surface of the connecting flange. The first reference plane and the second reference plane are perpendicular to each other. The tetrahedral box-shaped body has two sets of opposing faces, one set of opposing faces is symmetrical about the first reference plane, and the other set of opposing faces are respectively located on both sides of the second reference plane, but are asymmetric planes. The aperture is made of CCM40J fabric / epoxy carbon fiber composite material, and the cross section is an equal-thickness "L"-shaped cross section with a wall thickness of 0.8mm, that is, the aperture includes a first side plate and a second side plate constituting the "L"-shaped cross section, the outer plane of the second side plate of the aperture is fitted and glued to the inner surface of the body, and the inner end of the first side plate is chamfered, so that the inner end of the first side plate forms an edge line, and the edge lines of the same side of the 15 apertures need to be coplanar in theoretical position. The final accuracy of the load light shield is on the relative positions of the 15 apertures and the inner tangent surface of the free edge.

[0004] At present, similar multi-aperture multi-constraint strong coupling structure asymmetric tetrahedral load shading hood structures are usually manufactured by separately molding parts with margins, gluing the aperture to the body in steps, applying positive pressure to the fitting surface of the aperture and the body to make the bonding solidify, and finally combining them by machining to ensure accuracy. In the actual implementation process, it was found that this method has the following disadvantages and shortcomings:

[0005] (1) Due to the curing time limit of the adhesive, the step-by-step gluing process of the aperture single piece prolongs the product production cycle, and will result in a large number of tooling and increase management costs.

[0006] (2) Since both the body and the aperture are closed high modulus composite materials, the aperture is bonded in steps. The measure of applying positive pressure to the bonding surface of the aperture and the body will introduce large internal stress. The bonding gap cannot be effectively controlled, and local underpressure is prone to occur, resulting in poor bonding effect.

[0007] (3) As the aperture wall is thin and narrow, it is difficult to clamp and the tool is easily lost during machining, which reduces the machining accuracy. In addition, the main body is an asymmetric quadrangular pyramid with a deep inner cavity and small space. The tool travel is insufficient during the combined machining process, making it difficult to complete the machining of all the apertures. Summary of the invention

[0008] The technical problem solved by the present application is: to overcome the deficiencies of the prior art, to provide a multi-aperture asymmetric tetrahedral pyramid load light shield assembly tool and assembly method, to solve the problems of the existing multi-aperture multi-constraint strong coupling structure asymmetric tetrahedral pyramid load light shield structure with long assembly cycle, poor bonding effect and difficult machining.

[0009] The technical solutions provided by this application are as follows:

[0010] In the first aspect, a multi-aperture asymmetric tetrahedral load-bearing light shield assembly tool is provided, which is used to assemble the aperture with a body to obtain a light shield, including a base, a guide tube, a support column, a reference plate, a pressure nut and an aperture positioning device, the bottom ends of the multiple support columns and the guide tube are fixedly connected to the base, the top ends of the support columns are used for installing the reference plate, and the guide tube is used to guide the movement of the aperture positioning device; the aperture positioning device includes a profile, a support flange and a lifting rod, the profile is a tetrahedral pyramid that matches the inner profile of the body, the outer surface of the profile is fixedly connected with multiple support flanges, the support flange is used to place the aperture, the lifting rod is inserted into the middle position of the profile, the inner wall of the profile is fixedly connected to the lifting rod through multiple connecting rods, and the bottom end of the lifting rod is inserted into the guide tube; the reference plate is provided with a through hole that matches the lifting rod, and the pressure nut is threadedly connected to the end of the lifting rod that passes through the through hole; an anti-rotation structure is provided between the lifting rod and the guide tube, so that the lifting rod has only the freedom to move along the axis direction of the guide tube.

[0011] A boss is provided on one side surface of the reference plate, a fixing hole is opened at the boss position, a connecting flange at the small end of the body is fitted with the boss surface, and bolts are passed through the connecting flange and the fixing hole to fix the body to the reference plate; the coplanarity of the boss surface is not greater than 0.05mm.

[0012] The anti-rotation structure comprises an anti-rotation pin, a guide tube is provided with a vertical long strip groove, a lifting rod is provided with a horizontal anti-rotation hole, the anti-rotation pin penetrates into the anti-rotation hole and passes through the guide tube from the long strip groove.

[0013] The outer wall of the lifting rod is fixedly connected to a limiting ring, and the outer diameter of the limiting ring is greater than the inner diameter of the guide tube.

[0014] In a second aspect, a method for assembling a multi-aperture multi-constraint strong coupling structure asymmetric tetrahedral load light shield is provided, which is assembled using any of the multi-aperture asymmetric tetrahedral load light shield assembly tools described above, comprising:

[0015] S1: Insert the lifting rod into the guide tube and install the diaphragm on the corresponding supporting flange;

[0016] S2: Grind the bonding surface between the body and the aperture, apply adhesive to the bonding surface between the body and the aperture, install the reference plate with the body installed from top to bottom to the top of the support column, and pass the lifting rod through the through hole. Thread the pressure nut to the top of the lifting rod and tighten it to move the lifting rod upward along the Z axis by a predetermined amount Δz.

[0017] The method for determining the predetermined quantity Δz includes: according to the inner cavity size of the body and the outer size of the aperture, the position of the body during the assembly process is completely constrained by the reference plate; when the aperture is fully installed on the supporting flange and the limit ring is in contact with the upper end of the guide tube, an inner surface of the body is the first inner surface; the actual gap Δactual between the first inner surface of the body and the corresponding surface of the aperture is calculated; the gluing process has an optimal gluing gap Δoptimal; the gap adjustment amount between the aperture and the body is Δadjust=Δactual-Δoptimal; the movement amount of the aperture along the Z axis Δz=Δadjust / sinα, wherein α is the angle between the first inner surface of the body and the Z axis, and the Z axis is the axial direction of the guide tube.

[0018] The trial installation steps between S1 and S2 include: inspecting the sides around the aperture, marking the local low points and high points, leveling the low points with brushed carbon wire or carbon cloth, marking the high points, and then installing the reference plate with the body installed from top to bottom to the top of the support column, and at the same time passing the lifting rod through the through hole. If the reference plate and the body as a whole are blocked during the installation process, remove the reference plate and the body as a whole, grind the side of the local high point aperture until there is no gap between the reference plate and the support column installation surface, then remove the reference plate and the body as a whole, and apply a protective film to the non-glued area of ​​the inner wall of the body.

[0019] In summary, this application at least includes the following beneficial technical effects:

[0020] The present invention solves the problems of long assembly cycle, poor bonding effect and difficult machining of a similar multi-aperture multi-constraint strong coupling structure asymmetric tetrahedral load light shield structure, effectively reduces the number of bonding tools and bonding times, shortens the bonding cycle of the product, and at the same time ensures the final accuracy of the product through the tooling, eliminating the component assembly and machining link. The load light shield assembled by bonding using the multi-aperture asymmetric tetrahedral load light shield assembly tooling and assembly molding method has been tested to have good bonding performance and the precision size meets the design and use index requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of an asymmetric tetrahedral load-bearing sunshade;

[0022] Figure 2 It is a structural schematic diagram of the assembly tooling;

[0023] Figure 3 This is a schematic diagram of the assembly structure of the aperture and the supporting flange of this application.

[0024] Description of the reference numerals: 01-body; 02-aperture;

[0025] 1-1, base; 1-2, guide tube; 2, support column; 3, reference plate; 4, pressure nut; 5-1, profile; 5-2, support flange; 5-3, limit ring; 6, anti-rotation pin; α - angle between the inner surface of the body and the Z axis. DETAILED DESCRIPTION

[0026] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments disclosed in the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] The present application embodiment discloses a multi-aperture asymmetric quadrangular pyramid load light shield assembly tool and assembly molding method, such as Figure 1 The figure shows a schematic diagram of the structure of an asymmetric tetrahedral load-bearing light shield, which mainly includes a body 01, an aperture 02 (15 pieces) and other parts.

[0028] like Figure 2 The figure shows a schematic diagram of the assembly tool structure, which mainly includes a base 1-1, a guide tube 1-2, a support column 2, a reference plate 3, a pressure nut 4, an aperture positioning device and other parts.

[0029] The bottom ends of multiple support columns 2 are fixedly connected to the base 1-1, and the top ends of the support columns 2 are used for installing the reference plate 3. A boss is provided on one side surface of the reference plate 3, and a fixing hole is opened at the position of the boss. The connecting flange is fitted with the surface of the boss, and the main body is fixed to the reference plate 3 by passing bolts through the connecting holes and the fixing holes; in order to ensure the position installation accuracy between the main body and the reference plate 3, the surface of the boss is processed with high precision, and the coplanarity does not exceed 0.05mm. The setting of the boss reduces the processing area of ​​the high-precision surface; the guide tube 1-2 is fixedly connected to the base 1-1, and the guide tube 1-2 is vertically arranged.

[0030] like Figure 2 and Figure 3 As shown, the aperture positioning device includes a profile 5-1, a support flange 5-2, a lifting rod and a limit ring 5-3. The profile 5-1 is a quadrangular pyramid that matches the inner profile of the body 01. The small end of the profile 5-1 is at the top and the large end is at the bottom. The outer surface of the profile 5-1 is fixedly connected with multiple support flanges 5-2. The support flange 5-2 is used to place the aperture 02. The first side plate is placed on the upper surface of the support flange 5-2. The inner wall of the second side plate matches the outer edge of the support flange 5-2. The accuracy requirement of the support flange 5-2 is that the position of the aperture will not move after being placed on the support flange 5-2, and it is easy to detach from the support flange 5-2. The lifting rod is inserted into the middle position of the profile 5-1, and the inner wall of the profile 5-1 is fixedly connected to the lifting rod through multiple connecting rods. The limit ring 5-3 is fixedly connected to the outer wall of the lifting rod. The bottom end of the lifting rod is inserted into the guide tube 1-2, and the limit ring 5-3 is used to limit the maximum depth of the lifting rod inserted into the guide tube 1-2, thereby positioning the initial position of the diaphragm.

[0031] The reference plate 3 is provided with a through hole that matches the lifting rod, so that after the reference plate 3 is fixed to the top of the support column 2, the lifting rod can pass through the through hole, and the end of the lifting rod passing through the reference plate 3 is threadedly connected with a pressure nut 4. The guide tube 1-2 is provided with a vertical long strip groove, and the lifting rod is provided with a horizontal anti-rotation hole, and the anti-rotation pin 6 is inserted into the anti-rotation hole and passes through the long strip groove. When the pressure nut 4 is rotated to drive the lifting rod to move upward, the anti-rotation pin 6 can limit the rotation of the lifting rod, so that the lifting rod has only the freedom to move in the vertical direction (i.e., the Z axis).

[0032] The reference plate 3 provides the overall reference. The reference plate 3 is connected to the base 1-1 through the support column 2. The aperture positioning device realizes single-degree-of-freedom movement along the Z axis through the guide tube 1-2 and the anti-rotation pin 6. The body 01 is installed on the upper reference plate. The aperture positioning device can simultaneously carry and install 15 apertures 02. The whole moves along the Z axis within the Z-direction position tolerance range of the aperture 02 through the pressure nut 4, which can not only ensure the Z-direction position of the aperture 02, but also realize the control of the bonding gap between the aperture 02 and the body 01 during the bonding process, and ultimately ensure the product accuracy without the need for combined processing.

[0033] The vertical upward direction is the positive direction of the Z axis. After the body 01 is fixed on the reference plate 3 and the reference plate 3 is fixed on the support column 2, when the limit ring 5-3 contacts the top of the guide tube 1-2, the relative position of the diaphragm 02 and the body 1 is set to the initial installation position. The initial position is that the height of the upper surface of the support flange of the diaphragm positioning device from the boss surface on the reference plate 3 is the nominal height plus the upper limit of the design tolerance.

[0034] The load shield body and the aperture are assembled, including the following steps:

[0035] (1) Preliminary preparation: Receive the re-inspected qualified tooling and the processed body 01 and aperture 02, remove the pressure nut 4 and the reference plate 3, and accurately measure the tooling dimensions after reinstallation. After meeting the requirements, proceed with the subsequent work, measure and record the inner cavity dimensions of the body 01 and the outer dimensions of the aperture 02. One inner surface of the body 01 is the first inner surface. Calculate the actual gap Δactual between the first inner surface of the body 01 and the corresponding surface of the aperture 02. The bonding process has an optimal bonding gap Δoptimal. Therefore, the gap adjustment amount required for the product can be obtained as Δadjust = Δactual - Δoptimal. According to the geometric size relationship, the movable amount of the aperture 02 along the Z axis is determined as Δz = Δadjust / sinα, where α is the angle between the first inner surface of the body and the Z axis, and the Z axis is the axial direction of the guide tube 1-2;

[0036] (2) Test assembly of the aperture and body: insert the lifting rod of the aperture positioning device into the guide tube 1-2, match the 15 apertures 02 with the profile 5-1 through the inner contour, and install them on the 15-layer support flange 5-1 respectively. Use a high-flatness inspection ruler or inspection plate to inspect the sides of the aperture 02, mark the local low points and high points, use carbon wire or carbon cloth to level the low points, mark the high points, and then install the reference plate 3 and the body 01 as a whole on the support column 2 through pin screws. During the installation process, slowly install it downward from the +Z to the -Z direction. If the reference plate 3 and the body 01 are blocked during the installation process, remove the reference plate 3 and the body 01 as a whole, use fine sandpaper to grind the side of the local high point aperture until there is no gap between the reference plate 3 and the mounting surface of the support column 2. At this time, the reference plate 3 and the body 01 can be removed as a whole, and Teflon protection is applied to the non-bonded area of ​​the inner wall of the body 01;

[0037] (3) Gluing of aperture and body: Use fine sandpaper to lightly polish the bonding surface between the body and 15 apertures, then apply adhesive. According to the trial assembly sequence in (2), install aperture 02 and body 01 on the assembly fixture. By tightening the pressure nut 4, the aperture positioning device moves upward along the Z axis by a predetermined amount (i.e., Δz) to ensure a reasonable bonding gap for the product. After final curing, clean up the excess material and accurately measure the final size of the product.

[0038] The contents not described in detail in this application specification belong to the common knowledge of those skilled in the art.

[0039] The present application is described in detail above in conjunction with specific implementation methods and exemplary examples, but these descriptions cannot be understood as limiting the present application. Those skilled in the art understand that, without departing from the spirit and scope of the present application, a variety of equivalent replacements, modifications or improvements can be made to the technical solution of the present application and its implementation methods, all of which fall within the scope of the present application. The scope of protection of the present application shall be subject to the attached claims.

Claims

1. A multi-aperture asymmetric quadrangular pyramid load-bearing light shield assembly tool, used for assembling an aperture (02) and a body (01) to obtain a light shield, characterized in that: The invention comprises a base (1-1), a guide tube (1-2), a support column (2), a reference plate (3), a pressure nut (4) and an aperture positioning device, wherein the bottom ends of a plurality of support columns (2) and the guide tube (1-2) are fixedly connected to the base (1-1), the top ends of the support columns (2) are used for installing the reference plate (3), and the guide tube (1-2) is used for guiding the movement of the aperture positioning device; The aperture positioning device comprises a profile (5-1), a support flange (5-2) and a lifting rod. The profile (5-1) is in the shape of a quadrangular pyramid that matches the inner profile of the body (01). The outer surface of the profile (5-1) is fixedly connected with a plurality of support flanges (5-2). The support flanges (5-2) are used to place the aperture (02). The lifting rod is inserted into the middle position of the profile (5-1). The inner wall of the profile (5-1) is fixedly connected to the lifting rod through a plurality of connecting rods. The bottom end of the lifting rod is inserted into the guide tube (1-2). The reference plate (3) is provided with a through hole that matches the lifting rod. The pressure nut (4) is threadedly connected to the end of the lifting rod that passes through the through hole. An anti-rotation structure is provided between the lifting rod and the guide tube (1-2), so that the lifting tube has only the freedom to move along the axial direction of the guide tube (1-2).

2. The assembly tool according to claim 1, characterized in that: A boss is provided on one side surface of the reference plate (3), a fixing hole is provided at the position of the boss, a connecting flange at the small end of the body (01) is fitted with the surface of the boss, and bolts are passed through the connecting flange and the fixing hole to fix the body (01) on the reference plate (3); the coplanarity of the boss surface is not greater than 0.05 mm.

3. The assembly tool according to claim 1, characterized in that: The anti-rotation structure comprises an anti-rotation pin (6), the guide tube (1-2) is provided with a vertical long strip groove, the lifting rod is provided with a horizontal anti-rotation hole, the anti-rotation pin (6) penetrates into the anti-rotation hole and passes through the guide tube (1-2) from the long strip groove.

4. The assembly tool according to claim 1, characterized in that: The outer wall of the lifting rod is fixedly connected to a limiting ring (5-3), and the outer diameter of the limiting ring (5-3) is greater than the inner diameter of the guide tube (1-2).

5. A method for assembling an asymmetric tetrahedral load light shield with a multi-aperture multi-constraint strong coupling structure, characterized in that: The assembly is performed using a multi-aperture asymmetric quadrangular pyramid load light shield assembly tool as described in any one of claims 1 to 4, comprising: S1: Insert the lifting rod into the guide tube (1-2) and install the diaphragm (02) on the corresponding supporting flange (5-2); S2: Grind the bonding surface between the body (01) and the aperture (02), apply adhesive to the bonding surface between the body (01) and the aperture (02), install the reference plate (3) with the body (01) from top to bottom to the top of the support column (2), and pass the lifting rod through the through hole. Thread the pressure nut (4) to the top of the lifting rod and tighten it, so that the lifting rod moves upward along the Z axis by a predetermined amount Δz.

6. The assembly method according to claim 5, characterized in that: The method for determining the predetermined quantity Δz comprises: according to the inner cavity size of the body (01) and the outer size of the diaphragm (02), the position of the body (01) is completely constrained by the reference plate during the assembly process; when the diaphragm is completely installed on the supporting flange (5-1) and the limit ring (5-3) is in contact with the upper end of the guide tube (1-2), an inner surface of the body (01) is the first inner surface; the actual gap Δactual between the first inner surface of the body (01) and the corresponding surface of the diaphragm (02) is calculated; the gluing process has an optimal gluing gap Δoptimal; the gap adjustment amount between the diaphragm (02) and the body (01) is Δadjust=Δactual-Δoptimal; the movement amount of the diaphragm (02) along the Z axis is Δz=Δadjust / sinα, wherein α is the angle between the first inner surface of the body and the Z axis, and the Z axis is the axial direction of the guide tube (1-2).

7. The assembly method according to claim 5, characterized in that: The test assembly steps between S1 and S2 include: inspecting the sides of the aperture (02), marking the local low points and high points, leveling the low points with brushed carbon wire or carbon cloth, marking the high points, and then installing the reference plate (3) with the body (01) from top to bottom to the top of the support column (2), and at the same time passing the lifting rod through the through hole. If the reference plate (3) and the body (01) are blocked as a whole during the installation process, then remove the reference plate (3) and the body (01) as a whole, grind the side of the local high point aperture until there is no gap between the reference plate (3) and the mounting surface of the support column (2), then remove the reference plate (3) and the body (01) as a whole, and apply a protective film to the non-glued area of ​​the inner wall of the body (01).

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