Composite material tubular joint prefabricated body preparation device and method

Abstract

The invention belongs to the technical field of resin-based carbon fiber composite material manufacturing, and discloses a composite material tubular joint prefabricated body manufacturing device and method.The device comprises a bottom plate, and a quadrilateral groove and a columnar groove are formed in the bottom plate; the fixed supporting column is matched with the quadrilateral groove, and a threaded hole is formed in the fixed supporting column; the connector positioning pin is used for connecting the end part of the composite material tubular joint to the fixed supporting column; and the rotary supporting block is matched with the columnar groove and is connected with the end part of the composite material tubular joint through an interface positioning pin. The technical problem that an existing product and a laying layer are difficult to position is solved. Accurate positioning of the product and the laying layer position can be achieved, the laying layer position precision is guaranteed, and the device is suitable for laying operation with different laying layer structure characteristics.

Description

Technical Field

[0001] The present invention belongs to the technical field of manufacturing resin-based carbon fiber composite materials, and specifically relates to a device and method for preparing a composite material tubular joint preform. Background Art

[0002] Joints are connecting structures in aircraft structures, providing load transfer paths between components. With the large-scale and in-depth application of composite materials in aircraft structures, composite joints have become the development direction of aircraft structure optimization due to their advantages such as light weight and excellent fatigue performance. Tubular composite joints are used in aircraft landing gear and other parts. They are composed of a core mold and a composite structure. The composite material is the main load-bearing structure during the service of the aircraft. Both ends of the core mold have metal bushings with assembly holes to provide interfaces for other parts to connect.

[0003] The preparation process of tubular composite joints is as follows: prepare a core mold according to the product digital model, lay the reinforcement material layer on the surface of the core mold to prepare a preform, then assemble the preform with the mold, inject resin into the mold, make the preform fully infiltrated with the resin, finally solidify, and demold to obtain the product. In the actual operation process, the reinforcement material layer structure is complex, with circumferential layers, winding tows, and unfolded layers along different splicing directions. When positioning the layers, the core mold needs to be accurately positioned so that the specific laying position of the reinforcement layer can be determined by means such as laser projection. When laying, the core mold posture needs to be continuously adjusted to ensure that all parts of the product are operable. Summary of the invention

[0004] In order to solve the technical problem of the difficulty in positioning existing products and plies, the present invention application proposes a device and method for preparing a composite tubular joint preform, which can realize the accurate positioning of products and ply positions, ensure the accuracy of ply position, adapt to the paving operations with different ply structure characteristics, and the product angle can be continuously adjusted to ensure that there is sufficient operating space for all parts of the product during the paving process.

[0005] In order to achieve the above invention objectives, the technical solutions adopted in this application are as follows:

[0006] A composite material tubular joint preform preparation device, comprising:

[0007] A bottom plate, on which a quadrilateral groove and a columnar groove are provided;

[0008] A fixed support column, which is matched with the quadrilateral groove and has a threaded hole;

[0009] an interface locating pin that connects the end of the composite tubular joint to the fixed support column;

[0010] The rotating support block is matched with the columnar groove and connected with the end of the composite tubular joint through the interface positioning pin.

[0011] As a further solution of the present invention: the interface locating pin has a threaded locating pin, an interface core mold and a starter module which are connected in sequence, the interface core mold is adapted to the assembly holes at both ends of the composite tubular joint, and the threaded locating pin is adapted to the threaded hole on the fixed support column.

[0012] As a further solution of the present invention: the axis of the threaded locating pin coincides with the axis of the interface core mold.

[0013] As a further solution of the present invention: the opening module is provided with a mold opening hole.

[0014] As a further solution of the present invention: the rotating support block includes a block body, a rotating positioning pin is provided at the bottom of the block body, which is adapted to the columnar groove of the base plate; a supporting block threaded hole is provided in the middle of the block body, which is adapted to the interface positioning pin.

[0015] As a further solution of the present invention: the number of the fixed support column, the interface positioning pin, the rotating support block, the quadrilateral groove, and the columnar groove are 2, 3, 1, 3, and 1 respectively.

[0016] As a further solution of the present invention: a rolling bearing is embedded between the rotation positioning pin and the columnar groove.

[0017] As a further solution of the present invention: the fixed support column can also adopt a split structure, including:

[0018] Upper support column, lower support column: the cross-section of one end of the upper support column and the lower support column is a quadrilateral, which is matched with the quadrilateral groove on the bottom plate, and the other end is provided with a positioning boss;

[0019] Middle support column: The middle support column is provided with a threaded hole, and the threaded hole is matched with the threaded positioning pin on the interface positioning pin. The middle support column is also provided with two positioning grooves, and the positioning grooves are matched with the positioning bosses on the upper support block and the lower support block.

[0020] As a further solution of the present invention: the middle support column is also provided with a positioning pin, and the axis of the positioning pin coincides with the center axis of the middle support column.

[0021] A method for preparing a composite tubular joint preform, using the above-mentioned preparation device to prepare a composite tubular joint preform, comprising the following steps:

[0022] (a) preparing a product core mold with an assembly hole based on a three-dimensional digital model of a composite tubular joint product;

[0023] (b) connecting two fixed support columns to the quadrilateral grooves on the bottom plate;

[0024] (c) Connect the assembly hole on the product core mold with the interface core mold on the interface positioning pin;

[0025] (d) Connect the threaded positioning pin on the interface positioning pin to the threaded hole on the fixed support column;

[0026] (e) laying reinforcing material on the upper surface of the product core mold in the horizontal direction, then turning the core mold, fixed support column, and interface positioning pins 180° in the vertical direction, the fixed support column is connected to the quadrilateral groove on the bottom plate, and laying reinforcing material on the other side of the product core mold;

[0027] (f) Remove the interface positioning pin at one end of the fixed support column and the product core mold, and connect the threaded positioning pin on the interface positioning pin at the other end to the threaded hole on the rotating support block;

[0028] (g) embed the rolling bearing into the cylindrical groove of the bottom plate, and connect the rotating positioning pin on the rotating support block with the cylindrical groove on the bottom plate;

[0029] (h) rotating the core mold with the rotating positioning pin as the axis, and laying the reinforcing material on the core mold;

[0030] (i) Repeat steps (b) to (h) until the composite tubular joint preform is completed.

[0031] The preparation of a composite tubular joint preform using the device in the preferred embodiment comprises the following steps:

[0032] (a) Prepare a product core mold with assembly holes based on the three-dimensional digital model of the composite tubular joint product.

[0033] (b) Match the assembly hole on the product core mold with the interface core mold on the interface positioning pin, and then match the threaded positioning pin on the interface positioning pin with the threaded hole on the middle support column of the fixed support column.

[0034] (c) Connect the lower support column in the fixed support column to the quadrilateral groove on the bottom plate, match the positioning boss on the lower support column with the positioning groove on the middle support column, and then match the positioning boss of the upper support column with another positioning groove on the middle support column.

[0035] (d) Lay the reinforcing material on the upper surface of the core mold in the horizontal direction, then flip the product core mold, fixed support column, and interface positioning pins 180° in the vertical direction as a whole and connect them to the quadrilateral groove on the bottom plate, and continue to lay the reinforcing material on the other side of the product core mold.

[0036] (e) Remove the upper support column and the lower support column, insert the rolling bearing into the columnar groove of the bottom plate, and connect the positioning pin on the middle support column with the columnar groove on the bottom plate.

[0037] (f) Rotate the product core mold with the positioning pin as the axis and lay the reinforcing material on the product core mold.

[0038] (i) Repeat steps (b) to (f) until the composite tubular joint preform is completed.

[0039] Compared with the prior art, the beneficial effects of this application are:

[0040] 1. The product posture can be adjusted during the paving process. The product can be fixed horizontally by fixing the support column, and the product can be kept in a vertical posture by rotating the support block. The product posture can be adjusted to meet the operational requirements of different products and paving structures.

[0041] 2. The product can be rotated continuously in a vertical position, which provides a larger paving operation space and reduces the difficulty of operation.

[0042] 3. By utilizing the assembly holes of the joint products themselves, the product can be accurately positioned in a horizontal position, which can effectively ensure the accuracy of the layer position and product appearance.

[0043] 4. In actual operation, the device can be used flexibly according to the product and the ply structure. For the reinforcement layer with high positioning accuracy requirements, the laser projection can be used to accurately locate the ply position in the horizontal posture. For the splicing ply with the splicing surface parallel to the base plate, the fixed support column can be turned over and the reinforcement material can be laid on both sides in the horizontal posture. For the circumferential ply or the winding tow, the ply boundary can be positioned in the horizontal posture and then adjusted to the vertical posture to complete the preform preparation during the continuous rotation of the product mandrel.

[0044] The present application is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0046] In the attached picture:

[0047] Figure 1 A schematic diagram of a composite tubular joint preform preparation device for the present application;

[0048] Figure 2 This is a schematic diagram of the exploded structure of the composite tubular joint preform preparation device of the present application;

[0049] Figure 3This is a schematic diagram of an interface positioning pin for this application;

[0050] Figure 4 This is another schematic diagram of the interface positioning pin for this application;

[0051] Figure 5 This is a schematic diagram of the fixed support column structure for this application.

[0052] Explanation of the reference numerals in the figure: 1-base plate, 2-quadrilateral groove, 3-columnar groove, 4-interface locating pin, 5-interface core mold, 6-mold opening hole, 7-module opening, 8-threaded locating pin, 9-tubular joint, 10-assembly hole, 12-fixed support column, 13-threaded hole, 14-rotating support block, 15-rotating locating pin, 16-threaded hole of support block, 17-upper support column, 18-lower support column, 19-middle support column, 20-locating boss, 21-locating pin, 22-locating groove. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0054] Embodiment 1:

[0055] Composite tubular joint, 650mm long, consists of a core mold and a composite material structure. The middle section of the core mold is a composite material bracket, one end of the bracket extends into two branches, the two branches are connected to a metal bushing respectively, and the other end of the bracket has a composite ear piece and is connected to a metal bushing. The composite material structure is coated on the outside of the core mold, and the layer is composed of the following structural forms:

[0056] Hoop layup: The reinforcement fabric is wrapped several times around the surface of the tubular core mold.

[0057] Spliced ​​layup: The reinforcement material fabric does not overlap on the core mold surface and is spliced ​​along specific surfaces or lines.

[0058] Wrapped tow: The reinforcement fibers are wound around the mandrel surface at specific angles and lines.

[0059] Prepare the preform on the core mold, place the core mold horizontally on the operating table, determine the ply splicing position, lay the reinforcement fabric on the upper surface of the core mold, rotate the reinforcement material and the core mold to a certain angle, and continue to lay the reinforcement fabric on the upper surface. Prepare the winding tow, pull the tow along the length of the product, and continuously rotate the core mold during the process. Repeat the above steps until the preform is completed.

[0060] The tubular joint preform prepared by the above method needs to be constantly rotated to adjust the posture of the core mold during operation. The core mold cannot be accurately positioned, and auxiliary positioning methods such as laser projection cannot be used. Therefore, the positioning deviation of the layer position is about 1mm, which does not meet the technical requirements of the design acceptance (±0.5mm). When the tow is wound, the core mold cannot be rotated along a fixed axis, and the rotation of the core mold and the winding of the tow are carried out simultaneously, which makes the operation difficult. Therefore, the winding angle of the tow cannot be guaranteed, and the tow slips. When paving the circumferential layer, the paving operation space is only a limited area above the core mold, and the shaping effect is not good, so the layer has a lot of wrinkles and looseness.

[0061] Embodiment 2:

[0062] For the tubular joint in Example 1, a preform preparation device is designed, which includes the following parts:

[0063] Bottom plate 1: Rectangular flat plate structure with quadrilateral grooves 2 and columnar grooves 3.

[0064] 2 fixed support columns: The fixed support columns 12 match the quadrilateral grooves 2 on the bottom plate 1 , wherein one of the fixed support columns 12 has two threaded holes 13 in the middle, and the other fixed support column 12 has one threaded hole 13 on the top.

[0065] Interface positioning pin 4: includes an interface core mold 5, a starting module 7 with a mold opening hole 6, and a threaded positioning pin 8. One end of the interface core mold 5 is connected to the starting module 7, and the other end is connected to the threaded positioning pin 8. The axis of the threaded positioning pin 8 coincides with the axis of the interface core mold 5. The interface core mold 5 cooperates with the assembly holes 10 located at both ends of the composite tubular joint 8. The threaded positioning pin 8 is connected to the threaded hole 13 on the fixed support column 12.

[0066] 1 rotating support block 14: comprising a block, a rotating positioning pin 15 arranged at the bottom of the block and a supporting block threaded hole 16 arranged in the middle of the block, the rotating positioning pin 15 matches with the columnar groove 3 on the bottom plate 1, and a rolling bearing is embedded between the rotating positioning pin 15 and the columnar groove 3. The supporting block threaded hole 16 matches with the threaded positioning pin 8 on the interface positioning pin 4.

[0067] The composite tubular joint preform preparation device is used to prepare the composite tubular joint preform, which includes the following steps:

[0068] (a) Prepare a product core mold with assembly holes based on the three-dimensional digital model of the composite tubular joint product.

[0069] (b) Connect two fixed support columns 12 to the quadrilateral grooves 2 on the base plate 1 .

[0070] (c) The assembly hole 10 on the product core mold is matched and connected with the interface core mold 5 on the interface positioning pin 4.

[0071] (d) The threaded positioning pin 8 on the interface positioning pin 4 is matched and connected with the threaded hole 13 on the fixed support column 12.

[0072] (e) With the assistance of laser projection, determine the ply splicing position, lay the reinforcing material on the upper surface of the product core mold in the horizontal direction, then flip the core mold, fixed support column 12, and interface positioning pin 4 as a whole 180° in the vertical direction, connect the fixed support column 12 to the quadrilateral groove 2 on the base plate 1, and continue to lay the reinforcing material on the other side of the product core mold.

[0073] (f) Remove the interface positioning pin 4 at one end of the fixed support column 12 and the product core mold, and connect the threaded positioning pin 8 on the interface positioning pin 4 at the other end to the support block threaded hole 16 on the rotating support block 14.

[0074] (g) The rolling bearing is embedded in the columnar groove 3 of the bottom plate, and the rotation positioning pin 15 on the rotation support block 14 is matched and connected with the columnar groove 3 on the bottom plate 1.

[0075] (h) The mandrel is rotated with the rotating positioning pin 15 as the axis, so that the reinforcement material fibers are wound on the mandrel at a specified angle and linear shape. One end of the circumferential layer is positioned on the surface of the mandrel, and the mandrel is rotated with the rotating positioning pin 15 as the axis to complete the laying of the circumferential layer.

[0076] (i) Repeat steps (b) to (h) until the composite tubular joint preform is completed.

[0077] The composite tubular joint preform prepared according to the method of this embodiment defines the position of the core mold by fixing the support column and the interface positioning pin, so that the layer position can be accurately positioned. During the splicing and paving process, the positioning of the layer above the core mold is completed first, and then the fixed support column is turned over to position the layer below the core mold. When laying the circumferential layer and winding the tow, the rotation axis of the core mold is fixed by rotating the support block, so that the core mold can be continuously rotated, the operation difficulty is reduced, and the operation space is significantly increased, so the reinforcing fiber is flat, without defects such as wrinkles, bridging, and looseness.

[0078] Embodiment 3:

[0079] For the tubular joint in Example 1, a preform preparation device is designed. On the basis of the solution in Example 2, the structure of the fixed support column 12 is further adjusted, specifically including the following parts:

[0080] Upper support column 17, lower support column 18: The cross section of one end of the upper support column 17 and the lower support column 18 is a quadrilateral, which matches the quadrilateral groove 2 on the bottom plate 1, and the other end has a positioning boss 20;

[0081] Middle support column 19: The middle support column 19 has a threaded hole, which matches with the threaded positioning pin 8 on the interface positioning pin 4. The middle support column 19 also has a positioning pin 21, and the axis of the positioning pin 21 coincides with the central axis of the middle support column 19. The middle support column 19 also has two positioning grooves 22, which match and connect with the positioning bosses 20 on the upper support block 17 and the lower support block 18.

[0082] The preparation of a composite tubular joint preform using the device in the above scheme comprises the following steps:

[0083] (a) Prepare a product core mold with assembly holes based on the three-dimensional digital model of the composite tubular joint product.

[0084] (b) Match the assembly hole 10 on the product core mold with the interface core mold 5 on the interface positioning pin 4, and then match and connect the threaded positioning pin 8 on the interface positioning pin 5 with the threaded hole on the middle support column 19 of the fixed support column 12.

[0085] (c) Connect the lower support column 18 in the fixed support column 12 to the quadrilateral groove 2 on the bottom plate, match the positioning boss 20 on the lower support column 18 with the positioning groove 22 on the middle support column 19, and then match the positioning boss of the upper support column 17 with another positioning groove on the middle support column.

[0086] (d) Lay the reinforcing material on the upper surface of the core mold in the horizontal direction, then flip the product core mold, fixed support column 12, and interface positioning pin 4 as a whole 180° in the vertical direction and connect them to the quadrilateral groove 2 on the base plate 1, and continue to lay the reinforcing material on the other side of the product core mold.

[0087] (e) Remove the upper support column 17 and the lower support column 18, embed the rolling bearing into the columnar groove 3 of the bottom plate, and connect the positioning pin 21 on the middle support column 19 with the columnar groove 3 on the bottom plate 1.

[0088] (f) The product core mold 23 is rotated with the positioning pin 21 as the axis, and the reinforcing material is laid on the product core mold 23.

[0089] (i) Repeat steps (b) to (f) until the composite tubular joint preform is completed.

[0090] The composite tubular joint preform prepared according to the method of this embodiment has accurate layer positioning, low difficulty in paving operation, significantly increased operating space, flat reinforced fibers, and no defects such as wrinkles, bridging, and looseness. Compared with Example 2, Example 3 combines the function of the rotating support block with the fixed support column. When adjusting the product posture during the paving process, there is no need to remove the interface positioning pin, which makes the operation easier, and the device structure is further simplified, and the cost is further reduced.

[0091] So far, the purpose of the present invention has been achieved.

[0092] The above are only preferred embodiments of the present invention and are 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 protection scope of the present invention.

Claims

1. A composite tubular joint preform preparation device, characterized in that: include: A bottom plate, on which a quadrilateral groove and a columnar groove are provided; A fixed support column, which is matched with the quadrilateral groove and has a threaded hole; an interface locating pin that connects the end of the composite tubular joint to the fixed support column; The rotating support block is matched with the columnar groove and connected with the end of the composite tubular joint through the interface positioning pin.

2. The device for preparing a composite tubular joint preform according to claim 1, characterized in that: The interface locating pin comprises a threaded locating pin, an interface core mold and a starter module which are connected in sequence. The interface core mold is matched with the assembly holes at both ends of the composite tubular joint, and the threaded locating pin is matched with the threaded hole on the fixed support column.

3. The device for preparing a composite tubular joint preform according to claim 2, characterized in that: The axis of the threaded positioning pin coincides with the axis of the interface core mold.

4. A composite material tubular joint preform preparation device according to claim 3, characterized in that: The opening module is provided with a mold opening hole.

5. A composite material tubular joint preform preparation device according to any one of claims 1 to 3, characterized in that: The rotating support block comprises a block body, a rotating positioning pin is arranged at the bottom of the block body, and the rotating positioning pin is matched with the columnar groove of the bottom plate; a supporting block threaded hole is arranged in the middle of the block body, and the rotating positioning pin is matched with the interface positioning pin.

6. The device for preparing a composite tubular joint preform according to claim 5, characterized in that: The fixed support column, the interface positioning pin, the rotating support block, the quadrilateral groove, and the columnar groove are provided with 2, 3, 1, 3, and 1 respectively.

7. The device for preparing a composite tubular joint preform according to claim 6, characterized in that: A rolling bearing is embedded between the rotation positioning pin and the columnar groove.

8. A composite material tubular joint preform preparation device according to claim 6 or 7, characterized in that: The fixed support column may also adopt a split structure, including: Upper support column, lower support column: the cross-section of one end of the upper support column and the lower support column is a quadrilateral, which is matched with the quadrilateral groove on the bottom plate, and the other end is provided with a positioning boss; Middle support column: The middle support column is provided with a threaded hole, and the threaded hole is adapted to the threaded positioning pin on the interface positioning pin. The middle support column is also provided with two positioning grooves, and the positioning grooves are adapted to the positioning bosses on the upper support block and the lower support block.

9. The device for preparing a composite tubular joint preform according to claim 8, characterized in that: The middle support column is also provided with a positioning pin, and the axis of the positioning pin coincides with the center axis of the middle support column.

10. A method for preparing a composite tubular joint preform, using the above-mentioned preparation device to prepare a composite tubular joint preform, characterized in that: The following steps are involved: (a) preparing a product core mold with an assembly hole based on a three-dimensional digital model of a composite tubular joint product; (b) connecting two fixed support columns to the quadrilateral grooves on the bottom plate; (c) Connect the assembly hole on the product core mold with the interface core mold on the interface positioning pin; (d) Connect the threaded positioning pin on the interface positioning pin to the threaded hole on the fixed support column; (e) laying reinforcing material on the upper surface of the product core mold in the horizontal direction, then turning the core mold, fixed support column, and interface positioning pins 180° in the vertical direction, the fixed support column is connected to the quadrilateral groove on the bottom plate, and laying reinforcing material on the other side of the product core mold; (f) Remove the interface positioning pin at one end of the fixed support column and the product core mold, and connect the threaded positioning pin on the interface positioning pin at the other end to the threaded hole on the rotating support block; (g) embed the rolling bearing into the cylindrical groove of the bottom plate, and connect the rotating positioning pin on the rotating support block with the cylindrical groove on the bottom plate; (h) rotating the core mold with the rotating positioning pin as the axis, and laying the reinforcing material on the core mold; (i) Repeat steps (b) to (h) until the composite tubular joint preform is completed.

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