Composite material blade flanging skin forming tool

Abstract

The utility model provides a composite material blade flanging skin forming tool which comprises a blade upper pressing mold, a blade lower pressing mold, a blade upper pressing mold, a blade lower pressing mold, a blade upper pressing mold, a blade lower pressing mold, a blade upper pressing mold, a blade lower pressing mold, a blade upper pressing mold and a blade lower pressing mold, the blade upper pressing mold is provided with a first cavity, and the first cavity is matched with one face of a blade; the paddle lower pressing die is provided with a second cavity, the second cavity is matched with the other face of the paddle, and the second cavity is used for assembling the paddle upper skin, the girder and the foam; wherein the paddle lower skin is taken down from the first cavity, the paddle lower skin is transferred to the outer surfaces of the girder and the foam, the paddle upper pressing mold and the paddle lower pressing mold are subjected to mold closing, pressurization and curing, and a molded mold pressing paddle is obtained; according to the application, positioning and vacuumizing compaction of a skin flanging cloth laying layer can be realized, and the quality of the skin laying layer is ensured.

Description

Technical Field

[0001] This application belongs to the technical field of helicopter blade forming, and particularly relates to a forming tool for the flanged skin of a composite material blade. Background Art

[0002] The leading edge of the skin of a helicopter blade is designed with a flanged cloth edge wrapping. The main function is to keep the blade in a sealed state and be able to withstand the influence of a specific environment. At the same time, the blade has a large twist angle profile design. The flanged cloth at the leading edge of the skin extends from the blade root to the blade tip. The laying operation requires precise positioning. Each layer of skin needs to be closely fitted without bridging, bubbles, etc., in order to ensure the quality of the subsequent skin forming.

[0003] Most traditional helicopter blade skins are designed with butt joints on the upper and lower wing surfaces, and the twist angle change in the airfoil area of the blade is not large. The original skin forming tooling cannot meet the skin laying positioning and forming of the new type of blade with a flanged cloth design.

[0004] Therefore, it is necessary to improve the existing forming tooling for the composite material blade skin and design a tooling that can be applicable to both butt joint skins and flanged skin forming. Utility Model Content

[0005] Purpose of the Application: This application provides a forming tooling for the flanged skin of a composite material blade, which solves the problem of the laying positioning of the flanged cloth skin of the new type of blade and improves the quality of skin forming.

[0006] This application provides a forming tooling for the flanged skin of a composite material blade, and the tooling includes:

[0007] An upper blade die, having a first cavity, the first cavity being adapted to one side of the blade, and the first cavity being used for assembling the lower skin of the blade;

[0008] A lower blade die, having a second cavity, the second cavity being adapted to the other side of the blade, and the second cavity being used for assembling the upper skin, the main beam and the foam of the blade;

[0009] Wherein, the lower skin of the blade is removed from the first cavity, the lower skin of the blade is transferred to the outer surface of the main beam and the foam, and the upper blade die and the lower blade die are closed and pressurized for curing to obtain a formed molded blade.

[0010] Preferably, the tooling further includes:

[0011] A skin flanged cloth auxiliary block, arranged in the second cavity, and the skin flanged cloth auxiliary block is used for the laying positioning of the flanged cloth area of the blade skin.

[0012] Preferably, the skin flanged cloth auxiliary block includes:

[0013] Multiple auxiliary blocks that can be attached to the leading edge of the blade, where the auxiliary blocks are adapted to the leading edge of the blade;

[0014] A ball head pin for mounting the auxiliary block in the second cavity.

[0015] Preferably, the tooling further includes:

[0016] A skin layup limit block disposed in the first cavity, and the skin layup limit block is used for layup positioning of the blade skin flanging cloth area.

[0017] Preferably, the tooling further includes:

[0018] A blade tip plug block disposed in the second cavity, and the blade tip plug block is used for limiting and pressurizing the blade tip;

[0019] A blade root plug cover push block disposed in the second cavity, and the blade root plug cover push block is used for limiting and pressurizing the blade root.

[0020] Preferably, the tooling further includes:

[0021] Side guide plates are disposed on the sides of the blade lower die, and the side guide plates have guide grooves;

[0022] Straight plates are disposed on the sides of the blade upper die; wherein, during mold closing, the straight plates can be inserted into the guide grooves.

[0023] Advantageous technical effects of the present application:

[0024] The composite material blade flanging skin forming tooling designed in the present application, including the skin flanging cloth auxiliary block and the skin layup limit block therein, belongs to a portable and detachable tooling, which can realize the layup positioning and vacuum compaction of the skin flanging cloth, ensure the quality of the skin layup, transfer the skin after disassembly, and cure the upper and lower dies of the tooling in mold closing, so that the blade skin and other components are co-cured and formed, ensuring the smooth implementation of the forming process of the blade with a new leading edge with flanging cloth skin design. Description of the Drawings

[0025] Figure 1 is a schematic diagram of a composite material blade flanging skin forming tooling provided by an embodiment of the present application;

[0026] Figure 2 is a schematic diagram of the lower die of a composite material blade flanging skin forming tooling provided by an embodiment of the present application;

[0027] Figure 3 is a schematic diagram of the upper die of a composite material blade flanging skin forming tooling provided by an embodiment of the present application;

[0028] Wherein: 1 - blade lower pressing die; 2 - auxiliary block for skin flanging cloth; 3 - ball head pin; 4 - blade tip plug; 5 - pusher block for root plug cover; 6 - side guide plate; 7 - straight plate; 8 - skin laying limit block; 9 - blade upper pressing die; 10 - positioning insert sleeve. Detailed implementation manners

[0029] Please refer to Figure 1 and Figure 2 , the present application provides a design of a forming tooling specifically for the flanging skin of a composite material blade. The tooling mainly consists of a blade lower pressing die 1, an auxiliary block 2 for skin flanging cloth, a ball head pin 3, a blade tip plug 4, a pusher block 5 for root plug cover, a side guide plate 6, a straight plate 7, a skin laying limit block 8, a blade upper pressing die 9, and a positioning insert sleeve 10.

[0030] Please refer to Figure 3 , the blade is mainly formed by the closing and pressurizing of the blade upper pressing die 9 and the blade lower pressing die 1 of the tooling. The auxiliary block 2 for skin flanging cloth and the skin laying limit block 8 mainly play a role in assisting the laying positioning and vacuum pumping and compaction support of the skin in the flanging cloth area of the blade. The ball head pin 3 plays a role in fixing the auxiliary block for skin flanging cloth, facilitating the quick disassembly and installation of the auxiliary block. The blade tip plug 4 and the pusher block 5 for root plug cover play a role in limiting and pressurizing both ends of the blade. The side guide plate 6, the straight plate 7, and the positioning insert sleeve 10 play a role in assisting the closing and positioning of the upper and lower pressing dies of the tooling.

[0031] Among them, the blade lower pressing die is a non-rectangular block with an arc surface. One side is a plane, and the other side is an irregular arc surface that matches the blade upper pressing die. There is a second cavity inside, and a glue flow groove is provided around the cavity, which is used to guide the excess glue to flow out during the curing process of the blade. The surface of the blade lower pressing die with the cavity is engraved with positioning lines to assist in the laying positioning of the blade. The blade lower pressing die is mainly used for assembling and forming the upper skin of the blade.

[0032] Among them, the auxiliary block for skin flanging cloth is a non-rectangular block, which can be divided into multiple pieces. It mainly fits with the edge of the cavity of the blade lower pressing die. The auxiliary block for skin flanging cloth is engraved with blade laying positioning lines, which are used to assist in the laying positioning and vacuum pumping and compaction of the skin in the flanging area of the blade.

[0033] Among them, the ball head pin has a semi-spherical shape at one end and a straight rod design at the other end. The straight rod passes through the auxiliary block for skin flanging cloth and fixes it at the corresponding position on the blade lower pressing die, mainly playing the role of quickly installing, fixing, and disassembling the auxiliary block for skin flanging cloth.

[0034] Among them, the blade tip plug is a rectangular block, which is mainly installed at the blade tip position of the cavity of the blade lower pressing die and is installed in place before the die-pressed blade is closed and cured, playing the role of limiting the blade tip.

[0035] Among them, the root plug pusher block of the paddle is a combination of a pressing block with a circular arc at one end, a U-shaped block, and a threaded straight rod. The pressing block is mainly installed at the root position of the paddle blade in the lower die cavity of the paddle blade. The arc-shaped end surface matches the outer shape of the paddle blade root. There is a threaded hole in the middle of the other end, which matches the threaded straight rod. The U-shaped block has a through hole in the middle, and both ends are in contact with the end surface of the lower die of the paddle blade. The threaded straight rod passes through the through hole in the middle of the U-shaped block, aligns with the threaded hole of the pressing block, and applies a tightening pressure to the pressing block, thereby realizing the limiting and pressurizing effect on the root of the paddle blade.

[0036] Among them, the side guide plate is a rectangular block, and a guide groove is provided on the rectangular block, which is installed on the side of the lower die of the paddle blade. The end with the guide groove is in the same direction as one end of the cavity of the lower die of the paddle blade. When the upper die of the paddle blade and the lower die of the paddle blade are closed, the straight plate of the upper die of the paddle blade is inserted into the guide groove of the side guide plate, playing a role in positioning during die closing.

[0037] Among them, the straight plate is a rectangular block, which is installed on the side of the upper die of the paddle blade. When the upper die of the paddle blade and the lower die of the paddle blade are closed, the straight plate is inserted into the guide groove of the side guide plate, playing a role in positioning during die closing.

[0038] Among them, the skin layup limiting block is a non-rectangular block structure, which is positioned through the glue flow groove and the positioning line of the lower die of the paddle blade. The skin layup limiting block placed at one end of the cavity of the lower die of the paddle blade is the cut-off position corresponding to the skin laying. It mainly plays a role in limiting the layup in the decreasing area of the paddle blade skin.

[0039] Among them, the upper die of the paddle blade is a non-rectangular block with an arc surface. One side is a plane, and the other side is an irregular arc surface that matches the lower die of the paddle blade. There is a first cavity inside, and a glue flow groove is provided around the cavity, which is used to guide the excess glue to flow out during the curing process of the paddle blade. The surface of the upper die of the paddle blade with the cavity is engraved with a positioning line to assist in positioning the layup of the paddle blade. The upper die of the paddle blade is mainly used for assembling and forming the lower skin of the paddle blade.

[0040] Among them, the positioning bushing is designed in a cylindrical shape, with a circular groove inside. The positioning bushing is embedded around the lower die of the paddle blade, and the circular groove matches the positioning pins around the upper die of the paddle blade. It plays a role in accurately positioning and guiding during the die closing of the upper die and the lower die of the paddle blade.

[0041] In a feasible implementation manner, the specific assembly process is as follows:

[0042] (1) Use a ball head pin to fix the skin flanging cloth auxiliary block on the lower die of the paddle blade, and use a release cloth to lay the contact area between the skin flanging cloth auxiliary block and the skin, which is convenient for the skin in the subsequent flanging area to be peeled off from the tooling without deformation. When laying the flanged skin in a whole piece, position and lay the skin according to the positioning lines on the lower die of the paddle blade and the positioning lines on the skin flanging cloth auxiliary block. After laying, vacuum bag and apply vacuum pressure to each layer of the laid skin on the lower die of the paddle blade;

[0043] (2) Install the skin ply limiting blocks on the blade mold through the placeholder lines and the resin flow grooves to assist in the ply positioning of the decreasing area at the leading edge of the skin. After the laying is completed, remove the skin ply limiting blocks, and apply vacuum bagging and vacuum pressure to each layer of the laid skin on the blade mold;

[0044] (3) After the skin laying is completed, assemble other components of the blade (such as the root bushing, spar, foam, frequency modulation weight, etc.) so that they are co-cured with the skin to form the blade subsequently;

[0045] (4) Remove the skin flanging cloth auxiliary block on the lower mold, transfer the skin on the upper mold of the laid blade to the lower mold of the blade, layer by layer lap the skin in the leading edge flanging area of the upper and lower molds as required, and close the upper and lower molds;

[0046] (5) Place the mold on the hot press bed and perform heating and pressure curing to cure the blade skin.

Claims

1. A forming tool for the flanging skin of a composite material blade, characterized in that The tooling includes: An upper blade die, having a first cavity, the first cavity being adapted to one side of the blade, and the first cavity being used for assembling the lower blade skin; A lower blade die, having a second cavity, the second cavity being adapted to the other side of the blade, and the second cavity being used for assembling the upper blade skin, the spar and the foam; Wherein, the lower blade skin is removed from the first cavity, the lower blade skin is transferred to the outer surfaces of the spar and the foam, and the upper blade die and the lower blade die are closed and pressed for curing to obtain a formed molded blade.

2. The tooling according to claim 1, characterized in that, The tooling further includes: A skin flanging cloth auxiliary block, disposed in the second cavity, and the skin flanging cloth auxiliary block is used for laying and positioning the skin flanging cloth area of the blade.

3. The tooling according to claim 2, wherein The skin flanging cloth auxiliary block includes: A plurality of auxiliary blocks, capable of fitting on the leading edge of the blade, wherein the auxiliary blocks are adapted to the leading edge of the blade; Ball head pins, used for mounting the auxiliary blocks in the second cavity.

4. The tooling according to claim 3, characterized in that, The tooling further includes: A skin laying limit block, disposed in the first cavity, and the skin laying limit block is used for laying and positioning the skin flanging cloth area of the blade.

5. The tooling according to claim 4, characterized in that, The tooling further includes: A blade tip plug block, disposed in the second cavity, and the blade tip plug block is used for limiting and pressing the blade tip; A blade root plug cover push block, disposed in the second cavity, and the blade root plug cover push block is used for limiting and pressing the blade root.

6. The tooling according to claim 5, characterized in that, The tooling further includes: Side guide plates, disposed on the sides of the lower blade die, and the side guide plates have guide grooves; Straight plates, disposed on the sides of the upper blade die; wherein, during mold closing, the straight plates can be inserted into the guide grooves.

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