A composite parts processing technology based on special-shaped complex curved surface bonding tooling

Abstract

The present invention discloses a composite part processing technology based on a special-shaped complex curved surface adhesive tooling, including the following steps: S10, adhesive tooling installation: the adhesive tooling is clamped with the base through a quick fixing piece and an ear plate on the adhesive tooling; S20, composite board molding; S30, molding tooling replacement: remove the quick fixing piece and separate the adhesive tooling from the base, set the molding tooling at the corresponding position of the base, and clamp it with the base through the quick fixing piece and the ear plate on the molding tooling; S40, part semi-molding. The ear plate of the present invention is clamped and fixed with the base through a quick fixing piece, thereby avoiding threaded connection, so that the thread failure will not occur; and the expansion rod is subjected to the force direction of the trapezoidal clamping piece in the radial direction, that is, shear force, so it will not act on the internal thread through the expansion rod, and the thread failure at the through hole will not occur; the expansion rod will not bear axial force, and the screwing length of the internal thread and the external thread can be set very short, thereby improving the tooling installation efficiency.

Description

Technical Field

[0001] The invention relates to the field of aerospace technology, and in particular to a composite parts processing technology based on special-shaped complex curved surface bonding tooling. Background Art

[0002] At present, carbon fiber composite materials have been widely used in aviation, aerospace, automobile and other fields due to their excellent high specific strength, high specific modulus, designability and fatigue resistance. As a typical structure of composite materials used in various fields, carbon fiber honeycomb sandwich composite materials have good impact resistance and weight reduction effects. They are generally composed of an inner skin, a honeycomb core and an outer skin to form a structural whole.

[0003] The processing of composite parts includes: 1. Composite molding: on the gluing tool, the inner and outer skins are glued to the honeycomb to form a composite board; 2. Laying: on the molding tool, the molded composite board is glued to form a part with a thickness that meets the design requirements; 3. Curing, the molded parts are placed in a vacuum furnace for curing and molding. In the existing production process, multiple tools share the same base to reduce production costs and improve the utilization rate of factory space. Therefore, the tooling needs to be replaced from step 1 to step 2. In the prior art, the tooling is threadedly connected to the base through ear plates and bolts. Although the tooling and the base are detachable, the threaded holes on the base are prone to stripping and failure after long-term use, which directly affects the service life of the base; and the threaded connection requires repeated tightening of the bolts when the tooling is replaced, and the tooling replacement efficiency is low. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a composite parts processing technology based on special-shaped complex curved surface adhesive joining tooling. The ear plate is fixed to the base by a quick fixing piece, thereby avoiding threaded connection and preventing thread failure. The expansion rod is subjected to the force of the trapezoidal clamping piece in the radial direction, i.e., shear force, which will not act on the internal thread through the expansion rod, and thread failure at the through hole will not occur. The internal thread of the through hole only serves to fix the expansion rod, and the expansion rod will not be subjected to axial force. The screwing length of the internal thread and the external thread can be set very short. The expansion rod does not need to be rotated many times when fixed, thereby improving the tooling installation efficiency.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A composite parts processing technology based on special-shaped complex curved surface bonding tooling includes the following steps:

[0007] S10, installation of adhesive joint tooling: the adhesive joint tooling is connected to the base through the quick fixing parts and the ear plates on the adhesive joint tooling;

[0008] S20, composite board forming: the outer skin, the inner skin and the honeycomb are glued and fixed on the gluing tool to form a composite board;

[0009] S30, replacement of the molding tool: remove the quick fixing piece and separate the gluing tool from the base, set the molding tool at the corresponding position of the base, and clamp it with the base through the quick fixing piece and the ear plate on the molding tool;

[0010] S40, semi-forming of parts: composite plate laying, semi-forming of parts when the thickness requirement is met;

[0011] S50, part curing: placing the semi-formed part in step S40 into a vacuum furnace for curing, and obtaining a formed part after curing.

[0012] Furthermore, in the step S40, two adjacent composite panels are glued together.

[0013] Furthermore, the bonding tool comprises a tool body for supporting the parts and a pressing member for fixing the parts.

[0014] Furthermore, a T-shaped fixing groove is provided on the base, and the quick fixing part includes a clamping cap, a connecting column and an expansion rod, one end of the connecting column is fixed to the clamping cap, and the other end of the connecting column extends into the bottom of the fixing groove; a through hole is provided in the middle of the clamping cap and the connecting column, and the expansion rod is arranged in the through hole;

[0015] One end of the connecting column extending into the fixing groove is evenly distributed along the circumferential direction with at least two clearance grooves communicating with the through hole, a slidable trapezoidal clamping piece is arranged in the clearance groove, and a return spring is arranged between the trapezoidal clamping piece and the connecting column;

[0016] When the expansion rod is extended into the through hole and fixed, the trapezoidal clamping piece partially extends out of the clearance groove and the protruding part of the trapezoidal clamping piece is clamped with the fixing groove.

[0017] Furthermore, the inclined surfaces of the two trapezoidal clamping pieces are arranged opposite to each other, and the end of the expansion rod is an inverted cone structure adapted to the inclined surfaces of the trapezoidal clamping pieces.

[0018] Furthermore, an inner wall of the through hole is provided with an internal thread, an outer wall of the expansion rod is provided with an external thread, and the expansion rod is threadedly connected to the through hole.

[0019] Furthermore, the clamping cap is provided with a pin hole, the pin hole is connected to the through hole, the expansion rod is provided with a fixing hole coaxial with and connected to the pin hole, and the expansion rod is fixed by the fixing hole, the pin hole and the pin after being extended into the through hole.

[0020] Furthermore, a limiting plate is provided at one end of the expansion rod away from the fixing groove, and a hand-holding ring is provided on the limiting plate.

[0021] The beneficial effects of the present invention are:

[0022] The ear plate of the present invention is fixed to the base by a quick fixing piece, thereby avoiding threaded connection, and thus thread failure will not occur; and the expansion rod is subjected to the force of the trapezoidal clamping piece in the radial direction, i.e., shear force, and thus will not act on the internal thread through the expansion rod, and thread failure at the through hole will not occur; and the internal thread of the through hole only serves to fix the expansion rod, and the expansion rod will not be subjected to axial force, and thus the screwing length of the internal thread and the external thread can be set very short, and the expansion rod does not need to be rotated many times when fixed, thereby improving the efficiency of tooling installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A side view of the bonding tool and the base when they are connected in the embodiment of the present invention;

[0024] Figure 2 A top view of the bonding tool and the base when they are connected in the embodiment of the present invention;

[0025] Figure 3 This is a state diagram when the clamping cap and the connecting column are inserted into the ear plate and the base;

[0026] Figure 4 This is a schematic diagram of the middle ear plate of Example 1 being fixed to the base through a quick fixing piece;

[0027] Figure 5 for Figure 4 An enlarged schematic diagram of the local A in the middle;

[0028] Figure 6 This is a schematic diagram of the middle ear plate of Example 2 being fixed to the base via a quick fixing member;

[0029] In the figure, 1. Gluing tooling; 2. Base; 3. Ear plate; 4. Tooling body; 5. Clamping member; 6. Fixing groove; 7. Clamping cap; 8. Connecting column; 9. Expansion rod; 10. Through hole; 11. Displacement groove; 12. Trapezoidal snap-in piece; 13. Reset spring; 14. Latch; 15. Limiting plate; 16. Hand-held ring. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-Figure 6 , the present invention provides a technical solution:

[0032] Embodiment 1:

[0033] A composite parts processing technology based on special-shaped complex curved surface bonding tooling includes the following steps:

[0034] S10, installation of the gluing tool 1: the gluing tool 1 is clamped with the base 2 through the quick fixing parts and the ear plate 3 on the gluing tool;

[0035] S20, composite board forming: the outer skin, the inner skin and the honeycomb are glued and fixed on the gluing tool 1 to form a composite board;

[0036] S30, replacement of the molding tool: remove the quick fixing piece and separate the gluing tool from the base 2, set the molding tool at the corresponding position of the base 2, and clamp it with the base 2 through the quick fixing piece and the ear plate 3 on the molding tool;

[0037] S40, semi-forming of parts: Lay the composite panels and semi-form the parts when the thickness requirement is met; glue the adjacent composite panels together;

[0038] S50, part curing: placing the semi-formed part in step S40 into a vacuum furnace for curing, and obtaining a formed part after curing.

[0039] Furthermore, the bonding tool 1 comprises a tool body 4 for supporting parts and a pressing member 5 for fixing parts. The specific structure is shown in the figure and will not be described in detail here.

[0040] Furthermore, if Figure 1-Figure 6 As shown, the base 2 is provided with a T-shaped fixing groove 6, and the quick fixing member includes a clamping cap 7, a connecting column 8 and an expansion rod 9, one end of the connecting column 8 is fixed to the clamping cap 7, and the other end of the connecting column 8 extends into the bottom of the fixing groove 6; a through hole 10 is provided in the middle of the clamping cap 7 and the connecting column 8, and the expansion rod 9 is arranged in the through hole 10;

[0041] The pressing cap 7 and the connecting column 8 are an integrated structure.

[0042] One end of the connecting column 8 extending into the fixing groove 6 is evenly distributed along the circumferential direction with at least two clearance grooves 11 communicating with the through hole 10, and a slidable trapezoidal clamping piece 12 is provided in the clearance groove 11, and a return spring 13 is provided between the trapezoidal clamping piece 12 and the connecting column 8;

[0043] When the expansion rod 9 extends into the through hole 10 and is fixed, a portion of the trapezoidal clamping piece 12 extends out of the clearance groove 11 and the protruding portion of the trapezoidal clamping piece 12 is clamped with the fixing groove 6 .

[0044] The inclined surfaces of the two trapezoidal clamping pieces 12 are arranged opposite to each other, and the end of the expansion rod 9 is an inverted cone structure adapted to the inclined surfaces of the trapezoidal clamping pieces 12 .

[0045] The inner wall of the through hole 10 is provided with an internal thread, the outer wall of the expansion rod 9 is provided with an external thread, and the expansion rod 9 is threadedly connected to the through hole 10 .

[0046] When the connecting column 8 extends into the fixing groove 6 , the upper surface of the making way groove 11 is flush with the upper surface of the large-size portion of the fixing groove 6 .

[0047] Here, the fixing of the adhesive bonding tool 1 and the base 2 is described:

[0048] (1) Align the insertion holes of the ear plate 3 on the bonding tool 1 with the fixing groove 6 on the base 2 in a vertical manner.

[0049] (2) Insert the connecting column 8 into the fixing groove 6 through the plug hole on the ear plate 3. At this time, the lower surface of the clamping cap 7 is in close contact with the upper surface of the ear plate 3. When the connecting column 8 enters the fixing groove 6, the trapezoidal clamping piece 12 is retracted into the through hole 10, so that the outer surface of the trapezoidal clamping piece 12 is flush with the outer wall of the connecting column 8.

[0050] (3) Insert the expansion rod 9 into the through hole 10 and twist the expansion rod 9. As the expansion rod 9 twists, the expansion rod 9 moves downward. As the expansion rod 9 moves downward, the trapezoidal clamping piece 12 partially extends out of the clearance groove 11 under the action of its inclined surface and the end of the expansion rod 9, that is, the outer surface of the trapezoidal clamping piece 12 protrudes from the outer wall of the connecting column 8. When the expansion rod 9 is in place, the upper surface of the trapezoidal clamping piece 12 is tightly attached to the upper surface of the fixing groove 6, and the lower surface of the trapezoidal clamping piece 12 is tightly attached to the bottom surface of the clearance groove 11.

[0051] At this time, the adhesive joint tool 1 is fixedly connected to the base 2 by the ear plate 3 and the quick fixing piece. When the tool needs to be replaced, the expansion rod 9 is twisted in the opposite direction. When the end of the expansion rod 9 is located above the trapezoidal clamping piece 12, the trapezoidal clamping piece 12 is reset due to the lack of the limiting effect of the expansion rod 9 and the action of the reset spring 13. At this time, only an outward pulling force is applied to the quick fixing piece to release the connection state between the ear plate 3 and the base 2.

[0052] The ear plate 3 of the present invention is fixed to the base 2 by a quick fixing part, avoiding threaded connection, so that thread failure will not occur; and the expansion rod 9 is subjected to the force of the trapezoidal clamping piece 12 in the radial direction, that is, shear force, so it will not act on the internal thread through the expansion rod 9, and the thread failure at the through hole 10 will not occur; and the internal thread of the through hole 10 only serves to fix the expansion rod 9, and the expansion rod 9 will not bear axial force, so the screwing length of the internal thread and the external thread can be set very short, which can be but not limited to 1 / 10 of the length of the expansion rod 9; when fixing, the expansion rod 9 does not need to rotate many circles, thereby improving the efficiency of tooling installation.

[0053] Embodiment 2:

[0054] The difference between this embodiment and embodiment 1 is that Figure 6 As shown, the clamping cap 7 is provided with a latch hole 14, and the latch hole 14 is connected to the through hole 10. The expansion rod 9 is provided with a fixing hole coaxial with and connected to the latch hole 14. After the expansion rod 9 is extended into the through hole 10, it is fixed by the fixing hole, the latch hole 14 and the pin.

[0055] When the tooling is fixed, the other steps are the same as those in Example 1, except for step (3) in Example 1: insert the expansion rod 9 into place. When the expansion rod 9 is in place, the fixing hole is coaxial with the hole of the plug 14. At this time, the expansion rod 9 can be fixed by inserting the plug 14, thereby preventing the expansion rod 9 from being separated from the through hole 10 under the action of external force, thereby causing the connection between the ear plate 3 and the base 2 to fail.

[0056] With such arrangement, after the ear plate 3 is aligned with the base 2 , only three simple plugging actions are required to achieve the fixation of the tooling and the base 2 , which further simplifies the installation of the tooling and increases the installation speed of the tooling and the base 2 .

[0057] Embodiment 3:

[0058] This embodiment is based on Embodiment 1 or Embodiment 2. Figure 6 As shown, a limiting plate 15 is provided at one end of the expansion rod 9 away from the fixing groove 6 , and a hand-holding ring 16 is provided on the limiting plate 15 .

[0059] The provided hand-held ring facilitates the rotation or insertion / removal of the expansion rod.

[0060] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A composite parts processing technology based on special-shaped complex curved surface bonding tooling, Features: The steps include: S10, installation of adhesive joint tooling: the adhesive joint tooling is connected to the base through the quick fixing parts and the ear plates on the adhesive joint tooling; S20, composite board forming: the outer skin, the inner skin and the honeycomb are glued and fixed on the gluing tool to form a composite board; S30, replacement of the molding tool: remove the quick fixing piece and separate the gluing tool from the base, set the molding tool at the corresponding position of the base, and clamp it with the base through the quick fixing piece and the ear plate on the molding tool; S40, semi-forming of parts: composite plate laying, semi-forming of parts when the thickness requirement is met; S50, part curing: placing the semi-formed part in step S40 into a vacuum furnace for curing, and obtaining a formed part after curing; The base is provided with a T-shaped fixing groove, and the quick fixing part includes a clamping cap, a connecting column and an expansion rod, one end of the connecting column is fixed to the clamping cap, and the other end of the connecting column extends into the bottom of the fixing groove; a through hole is provided in the middle of the clamping cap and the connecting column, and the expansion rod is arranged in the through hole; One end of the connecting column extending into the fixing groove is evenly distributed along the circumferential direction with at least two clearance grooves communicating with the through hole, a slidable trapezoidal clamping piece is arranged in the clearance groove, and a return spring is arranged between the trapezoidal clamping piece and the connecting column; The inclined surfaces of the two trapezoidal clamping pieces are arranged opposite to each other, and the end of the expansion rod is an inverted cone structure adapted to the inclined surfaces of the trapezoidal clamping pieces.

2. According to claim 1, the composite parts processing technology based on the special-shaped complex curved surface bonding tooling, Features: In the step S40, two adjacent composite panels are bonded together.

3. According to claim 1, the composite parts processing technology based on the special-shaped complex curved surface bonding tooling, Features: The bonding tool comprises a tool body for supporting parts and a pressing member for fixing parts.

4. According to claim 1, the composite parts processing technology based on the special-shaped complex curved surface bonding tooling, Features: The inner wall of the through hole is provided with an internal thread, the outer side of the expansion rod is provided with an external thread, and the expansion rod is threadedly connected to the through hole.

5. According to claim 1, the composite parts processing technology based on the special-shaped complex curved surface bonding tooling, Features: The clamping cap is provided with a pin hole which is connected to the through hole. The expansion rod is provided with a fixing hole which is coaxial with and connected to the pin hole. After the expansion rod is inserted into the through hole, it is fixed by the fixing hole, the pin hole and the pin.

6. The composite parts processing technology based on the special-shaped complex curved surface bonding tooling according to claim 4 or 5, Features: A limiting plate is provided at one end of the expansion rod away from the fixing groove, and a hand-holding ring is provided on the limiting plate.

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