EVTOL aircraft wing lower skin forming mold

Abstract

The utility model discloses an eVTOL aircraft wing lower skin forming die which comprises a skin die, a forming groove is formed in the skin die, the interior of the forming groove is used for generating a lower skin assembly, an assembly positioning block is installed on the skin die, and the assembly positioning block is used for pressing the lower skin assembly. According to the mold, the stringer assembly precision is high, the two stringers are positioned through the stringer clamping grooves in the assembly positioning block, the assembly positioning block is a machining part and is high in precision, in this way, the distance between the two stringers can be effectively kept precise, meanwhile, the assembly positioning block is connected with the forming mold through the bolts, and the assembly precision is high. And the position precision between the stringer and the lower skin body can be effectively ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of aviation equipment, and in particular to a forming die for a lower wing skin of an eVTOL aircraft. Background Art

[0002] The wings of eVTOL aircraft are the most important load-bearing components of the aircraft. They bear various extreme loads during the flight of the aircraft, such as the load transmitted to the wings by the propeller pull during vertical take-off and landing, the overload load during flight maneuvers, and the tensile load on the lower skin of the wing. They are generally made of composite materials, so a forming mold is needed to form the skin structure. Existing composite wing skin molds mainly include fiberglass molds, steel molds, etc. The composite material layers are laid layer by layer on the mold according to the requirements of the drawings, and then vacuumed and heated to cure in a curing furnace or autoclave. The mold has a high degree of integration and is complex. It is easy to produce defects during the production of the wing skin. In addition, the positioning accuracy of the long stringer during the production of the wing skin is poor, which leads to poor positioning accuracy of the long stringer on the wing skin. Utility Model Content

[0003] The purpose of the utility model is to provide a lower skin forming mold for an eVTOL aircraft wing to solve the problems mentioned in the background technology. To achieve the above purpose, the utility model provides the following technical solutions: a lower skin forming mold for an eVTOL aircraft wing, comprising a skin mold, a forming groove is provided on the skin mold, the interior of the forming groove is used to generate a lower skin assembly, an assembly positioning block is installed on the skin mold, and the assembly positioning block is used to press the lower skin assembly.

[0004] Preferably, the lower skin assembly comprises a lower skin body, a long stringer is connected to the lower skin body, and ears are provided on the sides of the lower skin body.

[0005] Preferably, a connecting boss is provided on the assembly positioning block, and a long-beam clamping groove is opened at the end thereof, and the long-beam clamping groove structure corresponds to the long-beam structure.

[0006] Preferably, a lower skin body ear piece forming groove is opened on the side of the skin mold.

[0007] Preferably, an insert is installed on the skin mold, and the connecting boss is connected to the insert by bolts.

[0008] The technical effects and advantages of the utility model are as follows: the assembly precision of the long stringer of the mold is high: the two long stringers are positioned by the long stringer clamping groove on the assembly positioning block, and the assembly positioning block is a machined part with high precision, which can effectively maintain the distance between the two long stringers accurately, and at the same time, the assembly positioning block is connected to the forming mold by bolts, which can effectively ensure the position accuracy between the long stringer and the lower skin body;

[0009] Low cost: The long stringer is assembled on the skin, making full use of the blank area on the forming mold, such as the inside of the cover and the opening position of the lower skin. The assembly of the long stringer is completed by only a few assembly positioning blocks and the positioning and clamping of the long stringer and the blank area of ​​the forming mold. The processing cost of the assembly positioning blocks is low;

[0010] High product quality: When molding the lower skin body alone, the depression on the molding mold is filled and smoothed by the insert block. In this way, the vacuum bag will not have a large bend during molding, avoiding air leakage and improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is an axonometric drawing of the utility model;

[0012] Figure 2 It is an axonometric view of the forming die of the utility model without the assembly positioning block installed;

[0013] Figure 3 An axonometric view of the assembly positioning block of the utility model;

[0014] Figure 4 A partial view of the utility model for assembling a positioning block to position a long stringer;

[0015] Figure 5 It is a partial view of the lower skin forming mold of the utility model at the position of the skin ear piece;

[0016] Figure 6 This is a cross-sectional view of the utility model where the positioning block is assembled.

[0017] In the figure, 1. skin mold; 11. forming mold; 111. insert block; 12. lower skin body ear piece forming groove; 2. lower skin assembly; 21. lower skin body; 211. ear piece; 22. long stringer; 3. assembly positioning block; 31. connecting boss; 32. long stringer clamping groove; 4. bolt. DETAILED DESCRIPTION

[0018] In order to make the technical means for realizing the utility model, creative features, objectives and effects easy to understand, the utility model is further explained below in conjunction with specific diagrams. In the description of the utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, an integral connection or a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two components.

[0019] Example

[0020] like Figure 1As shown, the utility model is a molding die for the lower skin of the wing of an eVTOL aircraft, comprising a skin mold 1, an assembly positioning block 3 and a bolt 4 connected to the assembly positioning block 3; a molding groove is opened on the skin mold 1, the interior of the molding groove is used to generate the lower skin assembly 2, the assembly positioning block 3 is installed on the skin mold 1, and the assembly positioning block 3 is used to press the lower skin assembly 2; utilizing the structural characteristics of the lower skin assembly of the eVTOL aircraft, the maintenance cover is designed on the lower skin assembly 2, and the lower skin assembly 2 is composed of carbon fiber composite materials. During molding, it is necessary to lay a carbon fiber layer on the skin mold 1, evacuate, and cure and mold in an autoclave or a curing furnace. After the lower skin body 21 of the lower skin assembly 2 is formed, the assembly positioning block 3 is used when assembling the long stringer 22 of the lower skin assembly 2 to position the long stringer 22, and multiple assembly positioning blocks 3 are designed to prevent the deformation of the long stringer 22 itself and ensure the positioning accuracy of the long stringer 22 along the axial direction.

[0021] like Figure 2 As shown, this is the relationship between the lower skin body 21 and the molding mold 1 when it is molded separately. At this time, the assembly positioning block 3 is removed to ensure the smoothness of the surface of the molding mold 1, facilitate the sealing of the vacuum bag to the lower skin body 21 during curing molding, prevent the vacuum bag from being damaged and leaking, and improve the molding quality of the lower skin body 21.

[0022] like Figure 3 As shown, a connection boss 31 is designed on the assembly positioning block 3, and a long stringer clamping groove 32 is provided at the end. The connection boss 31 is connected to the insert block 111 of the forming mold 1 to ensure that it can be separated from the forming mold 1 when the lower skin body 21 is formed, and connected to the forming mold 1 when the long stringer 22 is assembled, meeting the requirements of the lower skin body 21 molding and the long stringer 22 assembly. The long stringer clamping groove 32 is connected to the long stringer 22 to position the long stringer 22, and the positioning accuracy of the long stringer 22 is met.

[0023] like Figure 4 As shown, the assembly positioning block 3 has different positioning methods for the long stringer 22 at different positions. The assembly positioning block 3 connected to the blank area of ​​the cover is positioned by the long stringer clamping groove 32. The assembly positioning block 3 connected to the blank area of ​​the opening position of the lower skin body 21 has one end against the vertical edge of the long stringer 22 to limit the deformation of the long stringer 22.

[0024] like Figure 5 As shown, a plurality of lower skin body ear piece forming grooves 12 for forming the lower skin body ear pieces are designed on the forming mold 1, so that after forming, when the lower skin assembly 2 is assembled with the internal skeleton of the wing and the upper skin assembly, positioning is performed through the holes on the ear pieces 211 of the lower skin assembly 2 to complete the assembly of the wing and improve the assembly accuracy.

[0025] like Figure 6As shown, when the long stringer 22 is assembled with the lower skin body 21, the lower skin body 21 and the long stringer 22 are both in a cured state, the long stringer clamping groove 32 of the assembly positioning block 3 clamps the long stringer 22, and the assembly positioning block 3 is installed on the molding mold 11 by the bolt 4, and structural glue is applied between the long stringer 22 and the lower skin body 21. After the assembly positioning block 3 fixes the long stringer 22, it is kept still for a certain period of time to solidify the structural glue between the long stringer 22 and the lower skin body 21, and the assembly of the long stringer 22 is completed. A suspended space is left between the assembly positioning block 3 and the lower skin body 21 to prevent bumps and scratches between the assembly positioning block 3 and the lower skin body 21 when assembling the long stringer 22.

[0026] In this embodiment, the forming mold 11 is made of aluminum alloy, the insert block 111 is made of steel, and the assembly positioning block 3 is made of steel, which can ensure that the forming mold 11 is relatively light, and at the same time the assembly positioning block 3 can meet the requirements of a large number of disassembly times.

[0027] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. 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. An eVTOL aircraft wing lower skin forming mold, comprising a skin mold, characterized in that: The skin mold is provided with a molding groove, the interior of the molding groove is used to generate the lower skin assembly, the skin mold is installed with an assembly positioning block, the assembly positioning block is used to press the lower skin assembly, the lower skin assembly includes a lower skin body, a long stringer is connected to the lower skin body, ears are provided on the side of the lower skin body, a connecting boss is provided on the assembly positioning block, a long stringer clamping groove is provided at the end, and the long stringer clamping groove structure corresponds to the long stringer structure.

2. The eVTOL aircraft wing lower skin forming mold according to claim 1, characterized in that: The side of the skin mould is provided with a lower skin body ear piece forming groove.

3. The eVTOL aircraft wing lower skin forming mold according to claim 2, characterized in that: An insert is installed on the skin mold, and the connecting boss is connected to the insert by bolts.

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