A composite material pull-torque strip curing tool and assembly curing method

Abstract

The present application relates to a kind of composite material tensile-torsional strip curing tool and assembly curing method, including lower template (1), core mould (2), stopper assembly, plug (4), upper cover plate (5) and gasket (7);The upper cover plate covers the plug and left and right slider, extrusion force is applied to upper cover plate and lower template, the overall fixation of tool can be realized;The gasket is used to be set between lower template and lower tensile-torsional plate, between upper and lower tensile-torsional plate and intermediate tensile-torsional plate, and between upper tensile-torsional plate and upper cover plate.The composite material tensile-torsional strip assembly tooling of the present application is simple in structure, easy to operate, the tensile-torsional strip prepared is significantly lighter in weight, and torsion, strength, wear resistance and other performances are excellent, meet the requirements.

Description

Technical Field

[0001] This invention relates to the field of composite material strength component manufacturing technology, specifically providing a composite material tension / torsion bar curing fixture and assembly curing method. Background Technology

[0002] Torsion bars are primarily used in the main and tail rotor hub structures of helicopters, mainly bearing the enormous centrifugal force and torsional deformation generated during rotor blade rotation. Traditional metal tension bars require high precision in their assembly interfaces, are difficult to assemble, and have a fatal flaw: excessive weight, which cannot meet the current trend of weight reduction in high-speed helicopters. To address the key issues of heavy weight and assembly difficulties associated with metal tension bars, efforts have begun to explore the design and production of new composite material tension bars to replace traditional metal ones. Summary of the Invention

[0003] The purpose of this invention is to propose a simple tooling and assembly process for high-strength glass fiber composite tension and torsion bar components, which can be used for high-quality and lightweight manufacturing of tension and torsion bars in high-speed helicopters.

[0004] The technical solution of this invention is:

[0005] The tooling of the present invention is used to manufacture composite material tension-torsion strips. The composite material tension-torsion strips include three layers of tension-torsion plates, each of which is a long strip with a through hole in the middle and lugs with lug holes at both ends. Glass fiber layers are cured at both ends of each layer of tension-torsion plates, and glass fiber layers are cured at both ends of the entire three layers of tension-torsion plates. An outer bushing is installed in the lug holes at both ends of the entire three layers of tension-torsion plates, and an inner bushing is fitted inside the outer bushing. The entire three layers of tension-torsion plates and the outer bushing are cured together.

[0006] This invention provides a curing fixture for composite material tension and torsion strips, including a lower template 1, a core mold 2, a stop block assembly 3, a plug 4, an upper cover plate 5, and a gasket 7;

[0007] The lower template 1 has an elongated groove, and a threaded hole is formed at the bottom of the elongated groove; the lower template has countersunk holes symmetrically formed at both ends of the elongated groove, and the countersunk holes are used to insert and position the core mold.

[0008] The lower part of the core mold is a positioning pin, which is positioned and engaged with the countersunk hole. The middle part of the core mold is a cylinder, which is used to position the outer bushing of the composite material. The plug is used to seal the upper port of the outer bushing.

[0009] The long slot is provided with the stop block assembly, the stop block assembly includes a screw, a left slider, an intermediate push block and a right slider, the intermediate push block is located between the left slider and the right slider and is in inclined surface cooperation with the left and right sliders, the intermediate push block is provided with a through hole, the screw penetrates through the through hole and is in cooperation with the threaded hole of the lower die plate, rotating the screw can form horizontal thrust on the left and right sliders through the inclined surface of the pressure on the intermediate push block, so that the left and right sliders are positioned at the end of the long slot; the left and right sliders, the plug cover and the lower die plate surround the curing space of the composite tensile-torsional strip;

[0010] The upper cover plate covers the plug cover and the left and right sliders, and extrusion pressure is applied to the upper cover plate and the lower die plate, so that the overall fixation of the tooling can be realized; the gasket is used to be arranged between the lower die plate and the lower tensile-torsional plate, between the upper and lower tensile-torsional plates and the intermediate tensile-torsional plate, and between the upper tensile-torsional plate and the upper cover plate.

[0011] Further, the curing tooling further includes a handle fixed to the edge of the lower die plate for carrying the curing tooling.

[0012] A preparation method of the composite tensile-torsional strip is also provided, including the following steps:

[0013] Step 1, wrapping the tensile-torsional plate, the tensile-torsional plate is made of high-strength glass fiber material, the tensile-torsional plate is a long strip plate, a long through hole is formed in the middle of the long strip plate, ear pieces are formed at both ends of the long strip plate, and the ear pieces are provided with ear piece holes; the ear pieces are wrapped by glass cloth, the glass cloth covers the ear piece holes, and a single-wrapped tensile-torsional plate is obtained

[0014] Then, three single-wrapped tensile-torsional plates are stacked, and the two ends of the three-layer stacked tensile-torsional plates are wrapped as a whole, and the three-layer ear pieces are wrapped as a whole ear piece.

[0015] The core mold is installed on the lower die plate, and the stop block assembly including the screw, the left slider, the intermediate push block and the right slider is installed in the long slot;

[0016] Step 2, the outer bushing is sleeved on the cylinder of the core mold, and the whole ear piece of the three-layer tensile-torsional plate is sleeved on the outer bushing; the gasket is filled in the gap between the lower die plate and the lower tensile-torsional plate, between the upper and lower tensile-torsional plates and the intermediate tensile-torsional plate, and between the upper tensile-torsional plate and the upper cover plate to provide support;

[0017] Step 3, the plug cover is covered on the upper end of the outer bushing and the whole ear piece of the three-layer tensile-torsional plate is pressed tightly, the screw is rotated, the left and right sliders are transversely molded on the whole ear piece at both ends of the three-layer tensile-torsional plate; the upper cover plate is pressed on the plug cover and the left and right sliders;

[0018] Step 4, the upper cover plate and the lower die plate are kept relative pressure, and after heating, the glass fiber cloth is cured, and the glass fiber, the three-layer tensile-torsional plate and the outer bushing are cured as an integrated structure;

[0019] Step 5, demoulding the integral structure, machining the inner hole of the outer sleeve, and fixedly assembling the inner sleeve, so that the inner sleeve is fixed in the outer sleeve, to obtain a composite tension-torsion strip.

[0020] Further, the inner sleeve is formed with a flange, and the flange covers the ear piece. The ear piece is protected by an outer layer.

[0021] Further, a gasket layer is arranged on the flange. Further, the gasket layer is further used as a protective layer.

[0022] Further, at least two layers of glass fiber cloth are wrapped around the ear piece of each layer of tension-torsion plate. Further, at least two layers of glass fiber cloth are wrapped around the whole three layers of tension-torsion plate.

[0023] Further, the outer sleeve is made of titanium alloy material. The strength is guaranteed while the weight is lightened.

[0024] Further, the inner sleeve is made of stainless steel material. The wear resistance is provided.

[0025] Further, the outer wall surface of the outer sleeve is a middle cylindrical surface and two end conical surfaces.

[0026] Further, the ear piece hole of the upper and lower tension-torsion plates is a conical hole, and the ear piece hole of the middle tension-torsion plate is a straight hole.

[0027] The advantages of the present application are:

[0028] 1. The tension-torsion strip assembly assembling tool has a simple structure, is convenient to operate, the prepared tension-torsion strip has a significantly reduced weight, and has excellent torsion, strength, wear resistance and other performances, and meets the requirements.

[0029] 2. Compared with the traditional metal tension-torsion strip, the composite material tension-torsion strip assembly does not need high assembly interface precision, and is easier to assemble.

[0030] 3. Compared with the traditional metal material tension-torsion strip, the high-strength glass fiber composite material tension-torsion strip has excellent fatigue life and lighter weight, and has a significant effect on weight reduction, which meets the weight reduction environment requirements of high-speed helicopters.

[0031] 4. The sleeve is designed as a waist drum shape, which is matched with the straight hole of the No. 1 tension-torsion strip prefabricated part and the conical hole of the No. 2 tension-torsion strip prefabricated part, to ensure the assembly quality.

[0032] 5. The design of the titanium alloy sleeve and the stainless steel shoulder sleeve can meet the strength requirements and achieve the weight reduction effect, and the secondary boring can further meet the hole center distance, perpendicularity and parallelism requirements of the tension-torsion strip assembly.

[0033] 6. The design of large and small cloth laid on both ends of high-strength glass fiber composite tensile-torsional strip assembly, which can play the role of assembling and gluing between tensile-torsional strip prefabricated parts, and can also play the role of strengthening, improving its torsional and tensile properties.

[0034] 7. The placement of the gasket between the cloth of the tensile-torsional strip prefabricated part, which can prevent the glue tumor from flowing in, and provide counter pressure in the cloth forming process, and ensure the gluing quality between the cloth and the tensile-torsional strip assembly.

[0035] 8. The stop block assembly is composed of left, middle and right three blocks, which are designed as wedge-shaped structure, facilitating installation and mold removal. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is the schematic diagram of the explosion of the tooling of the application;

[0037] Figure 2 is the schematic diagram of the tensile-torsional plate;

[0038] Figure 3 is the structural cross-sectional view of the tooling after combination;

[0039] Figure 4 is the schematic diagram of the use of the tooling;

[0040] Figure 5 is the cross-sectional view of the composite tensile-torsional strip;

[0041] Figure 6 is the structural schematic diagram of the composite tensile-torsional strip;

[0042] Figure 7 is the cross-sectional view of the end of the composite tensile-torsional strip;

[0043] Wherein: the lower die plate 1, the core die 2, the stop block assembly 3, the plug cover 4, the upper cover plate 5, the screw 6, the gasket 7, the left and right sliding blocks 8, the tensile-torsional plate 9, the outer bushing 10, the inner bushing 11, the glass fiber cloth 12, and the gasket 13. DETAILED DESCRIPTION

[0044] The disclosed examples will be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all, of the disclosed examples are shown. Indeed, a large variety of examples can be described and should be understood as not being limited to the examples set forth herein. Rather, the examples are described so that the disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0045] Referring to the accompanying drawings Figure 1 -7, the application provides a composite tensile-torsional strip curing tooling, which comprises a lower die plate 1, a core die 2, a stop block assembly 3, a plug cover 4, an upper cover plate 5, a gasket 7;

[0046] The lower mold plate 1 is provided with a long slot, and a threaded hole is formed in the bottom of the long slot; symmetrically formed at both ends of the long slot on the lower mold plate are counterbores for inserting and positioning the core mold;

[0047] The lower part of the core mold is a positioning pin which is inserted and positioned in the counterbores, the middle part of the core mold is a cylinder which is used to position the outer sleeve of the composite material, and the plug is used to cover the upper end of the outer sleeve;

[0048] The long slot is provided with the stopper assembly, which includes a screw, a left sliding block, an intermediate push block and a right sliding block. The intermediate push block is located between the left and right sliding blocks and is in inclined surface cooperation with the left and right sliding blocks. The intermediate push block is provided with a through hole, and the screw penetrates through the through hole and cooperates with the threaded hole of the lower mold plate. Rotating the screw can form a horizontal thrust on the left and right sliding blocks through the inclined surface of the intermediate push block, so that the left and right sliding blocks are positioned at the ends of the long slot. The left and right sliding blocks, the plug and the lower mold plate form a curing space for the composite tensile-torsional strip;

[0049] The upper cover plate covers the plug and the left and right sliding blocks, and an extrusion force is applied to the upper cover plate and the lower mold plate, so that the overall fixation of the tooling can be realized. The gasket is used to be arranged between the lower mold plate and the lower tensile-torsional plate, between the upper and lower tensile-torsional plates and the intermediate tensile-torsional plate, and between the upper tensile-torsional plate and the upper cover plate.

[0050] The curing tooling further comprises a handle fixed to the edge of the lower mold plate for carrying the curing tooling.

[0051] A preparation method of the composite tensile-torsional strip is also provided, which comprises the following steps:

[0052] Step 1, wrapping the tensile-torsional plate, the tensile-torsional plate is made of high-strength glass fiber material, the tensile-torsional plate is a long strip plate, a long through hole is formed in the middle of the long strip plate, ear pieces are formed at both ends of the long strip plate, and the ear pieces are provided with ear piece holes; the ear pieces are wrapped with glass cloth, the glass cloth covers the ear piece holes, and a single-wrapped tensile-torsional plate is obtained

[0053] Then, three single-wrapped tensile-torsional plates are stacked, and the two ends of the stacked three-layer tensile-torsional plate are wrapped as a whole, and the three layers of ear pieces are wrapped as a whole ear piece.

[0054] The core mold is installed on the lower mold plate, and the stopper assembly including the screw, the left sliding block, the intermediate push block and the right sliding block is installed in the long slot;

[0055] Step 2, the outer sleeve is sleeved on the cylinder of the core mold, and the whole ear piece of the three-layer tensile-torsional plate is sleeved on the outer sleeve; the gasket is filled in the gaps between the lower mold plate and the lower tensile-torsional plate, between the upper and lower tensile-torsional plates and the intermediate tensile-torsional plate, and between the upper tensile-torsional plate and the upper cover plate to provide support;

[0056] Step 3, cover the plug cap on the upper end of the outer bushing and press the whole ear of the three-layer tensile-twist plate, rotate the screw, so that the left and right sliders transversely mold the whole ear at both ends of the three-layer tensile-twist plate; press the upper cover plate on the plug cap and the left and right sliders;

[0057] Step 4, keep the pressure between the upper cover plate and the lower mold plate, heat through temperature rise, so that the glass fiber cloth is cured, and the glass fiber, the three-layer tensile-twist plate and the outer bushing are cured into an integrated structure;

[0058] Step 5, demold the integrated structure, process the inner hole of the outer bushing, and fixedly assemble with the inner bushing, so that the inner bushing is fixed in the outer bushing, and a composite tensile-twist strip is obtained.

[0059] The inner bushing is formed with a flange, and the flange covers the ear. The ear is protected by an outer layer.

[0060] A gasket layer is arranged on the flange. Further, it is used as a protective layer.

[0061] At least two layers of glass fiber cloth are wrapped around the ear of each layer of tensile-twist plate. Further, at least two layers of glass fiber cloth are wrapped around the three-layer tensile-twist plate as a whole.

[0062] The outer bushing is made of titanium alloy material. The strength is guaranteed while the weight is lightened.

[0063] The inner bushing is made of stainless steel material. Wear resistance is provided.

[0064] The outer wall surface of the outer bushing is a middle cylindrical surface and two end conical surfaces.

[0065] The ear hole of the upper and lower tensile-twist plates is a tapered hole, and the ear hole of the middle tensile-twist plate is a straight hole.

[0066] The description of the different advantageous arrangements has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the examples disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. Moreover, different advantageous examples can provide different advantages as compared to other advantageous examples. The chosen examples are selected to best explain the principles of the example, a practical application, and to enable this disclosure to best enable a wide variety of examples to those of ordinary skill in the art.

Claims

1. A composite material pull-torque strip curing fixture, characterized by: It comprises a lower die plate (1), a core die (2), a stopper assembly, a plug (4), an upper cover plate (5) and a gasket (7); The lower die plate 1 is provided with a long slot, and the bottom of the long slot is provided with a threaded hole; symmetrically at both ends of the long slot on the lower die plate, there are counterbores for inserting and positioning the core die; The lower part of the core die is a positioning pin which is inserted and positioned with the counterbores, and the middle part of the core die is a cylinder which is used to position the outer sleeve of the composite material, and the plug is used to cover the upper end of the outer sleeve; The long slot is provided with the stopper assembly, which comprises a screw (6), an intermediate push block (3) and left and right sliding blocks (8), the intermediate push block is located between the left and right sliding blocks and is in inclined surface cooperation with the left and right sliding blocks, the intermediate push block is provided with a through hole, the screw penetrates through the through hole and cooperates with the threaded hole of the lower die plate, rotating the screw can form horizontal thrust on the left and right sliding blocks through the inclined surface of the intermediate push block, so that the left and right sliding blocks are positioned at the ends of the long slot; the left and right sliding blocks, the plug and the lower die plate form a curing space for the composite tensile-torsional strip; The upper cover plate covers the plug and the left and right sliding blocks, and the upper cover plate and the lower die plate are pressed to realize the overall fixation of the tooling; the gasket is used to be arranged between the lower die plate and the lower tensile-torsional plate, between the upper and lower tensile-torsional plates and the intermediate tensile-torsional plate, and between the upper tensile-torsional plate and the upper cover plate.

2. A composite material pull-tow curing fixture as defined in claim 1, wherein: The curing tooling further comprises a handle fixed to the edge of the lower die plate for carrying the curing tooling.

3. A method of producing a composite material tensile-torsion strip using the curing tool according to claim 1 or 2, characterized in that, It comprises the following steps: Step 1, wrapping the tensile-torsional plate, the tensile-torsional plate is made of high-strength glass fiber material, the tensile-torsional plate is a long strip plate, a long through hole is formed in the middle of the long strip plate, and ear pieces are formed at both ends of the long strip plate, the ear pieces are provided with ear piece holes; the ear pieces are wrapped with glass cloth, and the glass cloth covers the ear piece holes to obtain a single-wrapped tensile-torsional plate Then, after stacking three single-wrapped tensile-torsional plates, the two ends of the stacked three-layer tensile-torsional plates are wrapped as a whole, and the three-layer ear pieces are wrapped as a whole ear piece; The core die is installed on the lower die plate, and the stopper assembly comprising the screw, the left sliding block, the intermediate push block and the right sliding block is installed in the long slot; Step 2, the outer sleeve is sleeved on the cylinder of the core die, and the whole ear piece of the three-layer tensile-torsional plate is sleeved on the outer sleeve; the gasket is filled in the gap between the lower die plate and the lower tensile-torsional plate, between the upper and lower tensile-torsional plates and the intermediate tensile-torsional plate, and between the upper tensile-torsional plate and the upper cover plate to provide support; Step 3, the plug is covered on the upper end of the outer sleeve and the whole ear piece of the three-layer tensile-torsional plate is pressed tightly, the screw is rotated, the left and right sliding blocks horizontally mold the whole ear piece at both ends of the three-layer tensile-torsional plate, and the upper cover plate is pressed on the plug and the left and right sliding blocks; Step 4, the upper cover plate and the lower die plate maintain relative pressure, and after heating, the glass fiber cloth is cured, and the glass fiber, the three-layer tensile-torsional plate and the outer sleeve are cured into an integrated structure; The curing tooling further comprises a handle fixed to the edge of the lower die plate for carrying the curing tooling. Step 5, demoulding the integrated structure, processing the inner hole of the outer sleeve, and assembling with the inner sleeve so that the inner sleeve is fixed in the outer sleeve, obtaining the composite tensile-torsional strip, the inner sleeve and the outer sleeve are in interference fit, or the inner sleeve and the outer sleeve are fixed through temperature difference assembly.

4. The method of claim 3 wherein the composite tensile-torsional strip is prepared by: The inner sleeve is formed with a flange, and the flange covers the ear piece to protect the ear piece.

5. The method of claim 4, wherein the composite tensile-torsional strip is prepared by: A gasket layer is arranged on the flange.

6. The method of claim 5, wherein the composite tensile-torsional strip is prepared by: The ear piece of each layer of tensile-torsional plate is wrapped with at least two layers of glass fiber cloth, and the whole three layers of tensile-torsional plate are wrapped with at least two layers of glass fiber cloth.

7. The method of claim 3, wherein the composite tensile-torsional strip is prepared by the steps of: The outer sleeve is made of titanium alloy material. ​ 8. The method of claim 3, wherein the composite tensile-torsional strip is prepared by the steps of: The inner sleeve is made of stainless steel material. ​ 9. The method for preparing composite material tension-torsion strips as described in claim 3, characterized in that: The outer wall surface of the outer sleeve is a middle cylindrical surface and two end conical surfaces.

10. The method of claim 9, wherein the composite tensile-torsional strip is prepared by: The ear piece hole of the upper and lower tensile-torsional plates is a conical hole, and the ear piece hole of the middle tensile-torsional plate is a straight hole.

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