A splicing device and method for large-sized paper honeycomb parts

Abstract

The present invention discloses a splicing device and method for large-size paper honeycomb parts. The splicing device includes a splicing and forming tooling, and the honeycomb sandwich to be spliced is encapsulated on the splicing and forming tooling; a foaming adhesive is laid at the splicing seam between the honeycomb sandwiches to be spliced; a first isolation layer is laid between the honeycomb sandwich and the splicing and forming tooling, and a second isolation layer is respectively laid above the honeycomb sandwich; a plurality of pressing plates are placed above the second isolation layer; a peelable cloth is laid above the splicing seam, a third isolation layer is laid above the peelable cloth, and a gasket is placed on the third isolation layer. The splicing method is to encapsulate the honeycomb core material, etc. on the splicing and forming tooling as required for curing; the pressing plates fix the honeycombs on both sides of the foaming adhesive without slipping, reducing the width of the splicing seam caused by the thermal expansion of the foaming adhesive; the gasket is placed on the splicing seam to evenly transmit pressure. The splicing method of the present invention is simple and easy to control, and can greatly improve the quality and qualification rate of the spliced honeycomb.

Description

Technical Field

[0001] The present invention relates to a splicing device and method for large-sized paper honeycomb parts. Background Art

[0002] Honeycomb sandwich structure composite parts are composed of two high-strength upper and lower composite panels sandwiching a honeycomb core. Because of its advantages such as light weight, large bending strength and stiffness, strong anti-buckling ability, fatigue and aging resistance, good sound absorption, sound insulation and heat insulation performance, etc., it has been widely used at present. Especially in the aerospace field, honeycomb sandwich structure composites have been widely used in aircraft structures, such as wings, fuselages, tails, radomes, floors, interior decorations, etc. The honeycomb sandwich structure has become one of the indispensable structural materials in this field with its superior performance.

[0003] When the internal core material of the composite sandwich structure has a required size larger than the raw material size, foaming glue is often used for splicing to ensure the filling and weight reduction effects. However, the foaming glue has a large thermal expansion coefficient during the curing process, which easily causes problems such as honeycomb slippage, seam depression, air bubbles in the seam, seam step difference and seam size out-of-tolerance, affecting the appearance quality of the honeycomb core parts. Summary of the Invention

[0004] In view of the above problems, the present invention provides a splicing method for large-sized paper honeycomb parts to solve the problems of large part size and honeycomb slippage and out-of-tolerance at the splicing joint caused by the thermal expansion stress of the foaming glue. The specific technical solutions are as follows:

[0005] First of all, the present invention provides a splicing device for large-sized paper honeycomb parts, including a splicing and forming tooling, and the honeycomb sandwich to be spliced is encapsulated on the splicing and forming tooling; foaming glue is laid at the splicing joint between the honeycomb sandwiches to be spliced; a first isolation layer is laid between the honeycomb sandwich and the splicing and forming tooling, and a second isolation layer is respectively laid above the honeycomb sandwich; several pressing plates are placed above the second isolation layer; a peelable cloth is laid above the splicing joint, a third isolation layer is laid above the peelable cloth, and a gasket is placed on the third isolation layer.

[0006] Preferably, the honeycomb sandwich is an aramid paper honeycomb.

[0007] Preferably, the surface of the splicing and forming tooling is consistent with the surface of the spliced honeycomb part.

[0008] Preferably, the first isolation layer, the second isolation layer and the third isolation layer are all isolation films.

[0009] Preferably, the pressing plate is made of a metal plate or a composite material.

[0010] Preferably, the gasket is cut from a metal sheet or a composite material, and its thickness is less than 1.5 mm.

[0011] Secondly, a splicing method for large-sized paper honeycomb parts of the present invention includes the following steps:

[0012] 1) Cut the required honeycomb sandwich according to the part processing requirements;

[0013] 2) Place the cut honeycomb sandwich on the splicing and forming tooling laid with the first isolation layer, and apply foaming glue at the splicing seam of the honeycomb sandwich;

[0014] 3) Lay the second isolation layer on the honeycomb sandwich on both sides of the splicing seam respectively, and then place a number of pressing plates on the second isolation layer laid respectively;

[0015] 4) Lay a peelable cloth, a third isolation layer, and a gasket in sequence above the splicing seam of the honeycomb sandwich, and then use a sealed bag for encapsulation and curing.

[0016] As a preferred technical solution, in step 2), the foaming glue applied at the splicing seam of the honeycomb sandwich needs to be heated and softened by a hot air gun, and then the foaming glue is manually pressed into the core cells of the honeycomb sandwich, and then splicing is carried out.

[0017] As a further preferred technical solution, the heating requirement of the hot air gun is that the distance between the air outlet and the foaming glue is not less than 150 mm, the maximum air temperature at 75 mm from the air outlet does not exceed 93 °C, and the hot air gun should be moved continuously during use to avoid local overheating.

[0018] As a preferred technical solution, in step 3), the pressure exerted by a single pressing plate on the honeycomb sandwich does not exceed 45 N; in step 4), the pressure exerted by the gasket on the honeycomb sandwich also does not exceed 45 N.

[0019] The following beneficial effects are achieved by the splicing device and method for large-sized paper honeycomb parts of the present invention:

[0020] 1) Using the forming tooling can pre-form the honeycomb after splicing and curing, avoiding the fracture or deformation of the splicing seam when the honeycomb and the skin are co-cured; 2) Heating and softening the foaming glue and pressing it into the honeycomb core cells is convenient for splicing operation, and at the same time, the air bubbles in the splicing seam can be discharged as much as possible to improve the quality of the splicing seam; 3) Using the pressing plate can fix the honeycomb core, avoiding the honeycomb slipping or the splicing seam size exceeding the tolerance due to the expansion of the foaming glue; 4) Using the conforming gasket and the peelable cloth to press the splicing seam, the peelable cloth can be used to remove the excess foaming glue, and by using the conformability and stiffness of the gasket, the flatness of the splicing seam surface can be ensured, avoiding the step difference and depression of the splicing seam. Therefore, the honeycomb splicing method of the present invention can realize the preparation of large-sized honeycomb core parts with high quality and high qualification rate, laying a foundation for the subsequent manufacture of qualified honeycomb sandwich structure composite parts. Description of the Drawings

[0021] Figure 1Schematic diagram of the splicing device for large-size paper honeycomb parts of the present invention;

[0022] Figure 2 Cross-sectional structure schematic diagram of the splicing device for large-size paper honeycomb parts of the present invention.

[0023] In the figure: 1. Splicing and forming tooling; 2. Honeycomb sandwich; 3. Splicing seam; 4. First isolation layer; 5. Second isolation layer; 6. Third isolation layer; 7. Pressing plate; 8. Peelable cloth; 9. Gasket. Specific embodiments

[0024] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments and the accompanying drawings. Obviously, the described embodiments are only preferred embodiments of the present invention, rather than all embodiments, nor are they other forms of limitation to the present invention. Any person skilled in the art may make changes or modifications equivalent to the disclosed technical content. However, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the protection scope of the technical solution of the present invention.

[0025] Embodiment 1

[0026] This embodiment is a splicing device and method for large-size paper honeycomb parts. The splicing device for large-size paper honeycomb parts is as shown in Figure 1 and Figure 2 and includes a splicing and forming tooling 1, and the honeycomb sandwich 2 to be spliced is encapsulated on the splicing and forming tooling 1; foaming glue is laid at the splicing seam 3 between the honeycomb sandwiches 2 to be spliced; a first isolation layer 4 is laid between the honeycomb sandwich 2 and the splicing and forming tooling 1, and a second isolation layer 5 is respectively laid above the honeycomb sandwich 2; several pressing plates 7 are placed above the second isolation layer 5; a peelable cloth 8 is laid above the splicing seam 3, a third isolation layer 6 is laid above the peelable cloth 8, and a gasket 9 is placed on the third isolation layer 6. Using the pressing plate to fix the honeycomb on both sides of the foaming glue without slipping, reducing the width of the splicing gap caused by the thermal expansion of the foaming glue; and using the gasket to place on the splicing seam to evenly transfer the pressure. Compared with the traditional honeycomb splicing method, the splicing method of the present invention is simple, easy to control, and can greatly improve the quality and qualification rate of the spliced honeycomb.

[0027] In this embodiment, the honeycomb sandwich 2 is an aramid paper honeycomb; the surface of the splicing and forming tooling 1 is consistent with the surface of the spliced honeycomb part; the first isolation layer 4, the second isolation layer 5, and the third isolation layer 6 are all isolation films; the pressing plate 7 is made of a metal plate or a composite material; the gasket 9 is cut from a metal sheet or a composite material, and its thickness is less than 1.5 mm.

[0028] The splicing method for the large-size paper honeycomb parts includes the following steps:

[0029] 1) Cut the required honeycomb sandwich 2 according to the part processing requirements;

[0030] 2) Place the cut honeycomb sandwich 2 on the splicing and forming tooling 1 paved with the first isolation layer 4, and apply foaming glue at the splicing seam 3 of the honeycomb sandwich 2; heat and soften it with a hot air gun, then manually press the foaming glue into the core cells of the honeycomb sandwich 2, and then perform splicing. The heating requirement of the hot air gun is that the distance between the air outlet and the foaming glue is not less than 150 mm, the maximum air temperature at 75 mm from the air outlet does not exceed 93 °C, and the hot air gun should be moved continuously during use to avoid local overheating.

[0031] 3) Lay the second isolation layer 5 on both sides of the honeycomb sandwich 2 at the splicing seam 3 respectively, and then place a number of pressing plates 7 on the second isolation layer 5 laid respectively. The pressure exerted by a single pressing plate 7 on the honeycomb sandwich 2 does not exceed 45 N; the number of pressing plates is not limited and can be determined according to the honeycomb size.

[0032] 4) Lay a peelable cloth 8, a third isolation layer 6, and a gasket 9 in sequence above the splicing seam 3 of the honeycomb sandwich 2. The pressure exerted by the gasket 9 on the honeycomb sandwich 2 also does not exceed 45 N. Under a vacuum pressure of -0.034 MPa, it can be completely fitted to the honeycomb surface, and at the same time has a certain rigidity to improve the surface flatness. Then use a sealing bag for encapsulation and curing.

[0033] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the same elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0034] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A splicing method for large-size paper honeycomb parts, characterized in that: The splicing device adopted includes a splicing and forming tooling, and the honeycomb sandwich to be spliced is encapsulated on the splicing and forming tooling; foaming glue is laid at the splicing seam between the honeycomb sandwiches to be spliced; a first isolation layer is laid between the honeycomb sandwich and the splicing and forming tooling, and a second isolation layer is respectively laid above the honeycomb sandwich; a plurality of pressing plates are placed above the second isolation layer; a peelable cloth is laid above the splicing seam, a third isolation layer is laid above the peelable cloth, and a gasket is placed on the third isolation layer; The splicing method of the large-size paper honeycomb part includes the following steps: 1) Cut the required honeycomb sandwich according to the part processing requirements; 2) Place the cut honeycomb sandwich on the splicing and forming tooling laid with the first isolation layer, lay foaming glue at the splicing seam of the honeycomb sandwich, heat and soften it with a hot air gun, then manually press the foaming glue into the core cells of the honeycomb sandwich, and then perform splicing; 3) Lay a second isolation layer on the honeycomb sandwiches on both sides of the splicing seam respectively, and then place a plurality of pressing plates on the second isolation layers laid respectively; the pressure applied by a single pressing plate to the honeycomb sandwich does not exceed 45 N; 4) Lay a peelable cloth, a third isolation layer and a gasket in sequence above the splicing seam of the honeycomb sandwich, and then use a sealing bag for encapsulation and curing; The pressure applied by the gasket to the honeycomb sandwich also does not exceed 45 N.

2. The splicing method of the large-size paper honeycomb part according to claim 1, characterized in that: The honeycomb sandwich is an aramid paper honeycomb.

3. The splicing method of the large-size paper honeycomb part according to claim 1, characterized in that: The surface of the splicing and forming tooling is consistent with the surface of the spliced honeycomb part.

4. The splicing method of the large-size paper honeycomb part according to claim 1, characterized in that: The first isolation layer, the second isolation layer and the third isolation layer are all isolation films.

5. The splicing method of the large-size paper honeycomb part according to claim 1, characterized in that: The pressing plate is made of a metal plate or a composite material.

6. The splicing method of the large-size paper honeycomb part according to claim 1, wherein: The gasket is cut from a metal sheet or a composite material, and its thickness is less than 1.5 mm.

7. The splicing method of the large-sized paper honeycomb parts according to claim 1, characterized in that: The heating requirement of the hot air gun is that the distance between the air outlet and the foaming glue is not less than 150 mm, the highest air temperature at 75 mm from the air outlet does not exceed 93 °C, and the hot air gun should be moved continuously during use to avoid local overheating.

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