Aircraft model skin demoulding air cushion ejection mechanism

Abstract

The utility model discloses a kind of air cushion ejection mechanisms for aircraft model skin stripping, comprising: including: bottom mould, mould frame and top die;Bottom mould is cuboid plate structure, the top surface center position of bottom mould is provided with mould core, the bottom edge of mould core is provided with the mould groove around its bottom, the top edge of mould core is provided with the top edge ring different from the expansion coefficient of mould core;Mould frame is detachably arranged in the mould core side of bottom mould;Top die is detachably arranged in the side of mould frame away from bottom mould;The four corners of bottom mould, mould frame and top die are fixedly connected by fixed bolt, bottom mould, mould frame and top die form mould cavity in mould after mutual sequentially overlapping;By setting the top edge ring different from the expansion coefficient of mould core, micro-gap is generated when temperature changes using material thermal deformation difference, provide initial separation condition for stripping, reduce stripping starting force.

Description

Technical Field

[0001] This utility model relates to the field of tooling technology for aircraft model manufacturing, and more specifically, it relates to an air cushion ejection mechanism for demolding aircraft model skin. Background Technology

[0002] In the manufacturing process of aircraft model skin, composite materials are often hot-pressed into molds. After molding, the skin and the mold surface are tightly bonded due to material shrinkage, surface adsorption and residual stress. Traditional demolding methods often rely on manual prying or impact, which can easily cause damage to the skin surface, edge tearing or mold surface scratches. Especially for large or complex curved skins, the demolding difficulty and risk are further increased.

[0003] Many existing pneumatic demolding devices have simple air holes on the mold and use gas pressure to push the skin apart. However, in practical applications, uneven pressure distribution, gas leakage, or local adhesion of the skin often lead to incomplete demolding, skin deformation, or low demolding efficiency.

[0004] Therefore, a demolding mechanism that can achieve uniform force application, adapt to different skin structures, and operate safely is needed. Utility Model Content

[0005] The purpose of this invention is to provide an air cushion ejection mechanism for demolding aircraft model skin, in order to solve the problems in the prior art.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: an air cushion ejection mechanism for demolding the skin of an aircraft model, comprising: a bottom mold, a mold frame, and a top mold.

[0007] The bottom mold has a cubic plate-like structure. A mold core is provided at the center of the top surface of the bottom mold. A mold groove is provided around the bottom edge of the mold core. A top edge ring with a different coefficient of expansion is provided at the top edge of the mold core. The mold frame is detachably mounted on one side of the mold core of the bottom mold. The top mold is detachably mounted on the side of the mold frame away from the bottom mold. The four corners of the bottom mold, the mold frame, and the top mold are fixedly connected by fixing bolts. The bottom mold, the mold frame, and the top mold overlap each other in sequence to form a mold cavity in the mold.

[0008] By setting a top edge ring with a different coefficient of thermal expansion than the mold core, the difference in thermal deformation of the material generates micro-gaps when the temperature changes, providing initial separation conditions for demolding and reducing the demolding start force.

[0009] The present invention is further configured such that: the bottom mold is an annular sheet structure, and at least one injection port communicating with the mold groove is opened on the side of the bottom mold away from the mold core.

[0010] The injection port is used to inject composite materials into the mold cavity during the molding stage, ensuring that the material fully fills all parts of the mold cavity; it is connected to the mold groove, which facilitates the injection of gas from the same path during demolding, forming a uniform air cushion, pushing the skin to separate smoothly along the surface of the mold core, improving demolding integrity and efficiency.

[0011] The present invention is further configured such that: the four corners of the mold frame near the top mold are provided with recessed holes for accommodating springs, and the two ends of the springs respectively abut against the top mold and the mold frame.

[0012] The spring provides initial elastic thrust during mold opening, assisting in the initial separation between the top mold and the mold base, and reducing mold opening resistance. At the same time, the spring acts as a buffer and pre-tightener during mold closing, enhancing the overall closing stability of the mold and preventing misalignment of the mold cavity due to uneven pressure.

[0013] The present invention is further configured such that: a positioning ring, at least partially embedded in the countersunk hole, is provided on the side of the top mold near the mold frame on the side corresponding to the countersunk hole.

[0014] By using the positioning ring and the countersunk hole, precise positioning between the top mold and the mold frame is achieved, ensuring that the mold cavity remains aligned during multiple mold opening and closing processes, preventing uneven skin thickness or structural defects caused by misalignment; at the same time, it enhances the overall rigidity of the mold and reduces deformation.

[0015] The present invention is further configured such that: a plurality of air holes are provided in the forming surface of the top mold on the side near the mold frame.

[0016] By distributing air pores in key areas of the forming surface, and introducing controllable air pressure during demolding, the gas acts evenly on the back of the skin through the air pores, forming a local air cushion effect, which effectively reduces the contact area and adhesion force between the skin and the mold surface, thereby achieving smooth demolding without damage to the skin.

[0017] In summary, this utility model has the following beneficial effects: By setting a top edge ring with a different coefficient of thermal expansion than the mold core, the difference in thermal deformation of the material generates micro-gaps when the temperature changes, providing initial separation conditions for demolding and reducing the demolding start force.

[0018] A gas channel connecting the injection port and the mold groove is set in the mold cavity. Combined with the air holes on the forming surface, the air cushion is evenly distributed, avoiding local adhesion and improving the integrity and efficiency of demolding.

[0019] The spring and positioning ring structure enhances the mold's opening and closing stability and repeatability, ensuring consistent skin molding quality and extending the mold's service life. Attached Figure Description

[0020] Figure 1 This is a perspective view of an embodiment of the present utility model; Figure 2 This is a cross-sectional view of an embodiment of this utility model; Figure 3 This is a first perspective view of an embodiment of the present utility model; Figure 4 This is a second perspective view of an embodiment of this utility model.

[0021] In the picture: 1. Top mold; 11. Air vent; 12. Positioning ring; 13. Step hole; 2. Mold frame; 21. Countersunk hole; 3. Bottom mold; 31. Top edge ring; 32. Mold core; 33. Mold groove; 34. Injection port; 4. Mold cavity; 5. Spring. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] The following is in conjunction with the appendix Figure 1-4 The present invention will be described in further detail below, but the scope of protection of the present invention is not limited to the following description. Example

[0029] This embodiment provides an air cushion ejection mechanism for demolding the skin of an aircraft model, including: a bottom mold 3, a mold frame 2, and a top mold 1. The four corners of the bottom mold 3, mold frame 2, and top mold 1 are fixedly connected by fixing bolts. Figure 2 As shown, the bottom mold 3, mold frame 2 and top mold 1 overlap in sequence to form a mold cavity 4 inside the mold.

[0030] The bottom mold 3 has a cubic plate-like structure. A mold core 32 is provided at the center of the top surface of the bottom mold 3. A mold groove 33 is provided around the bottom edge of the mold core 32. A top edge ring 31 with a different coefficient of thermal expansion than the mold core 32 is provided at the top edge of the mold core 32. By providing a top edge ring 31 with a different coefficient of thermal expansion than the mold core 32, the difference in thermal deformation of the material is used to generate micro gaps when the temperature changes, providing initial separation conditions for demolding and reducing the demolding starting force.

[0031] In this embodiment, the metals with different coefficients of thermal expansion for the top edge ring 31 can be aluminum alloys such as 6061, and the mold steel is mold steel with a difference of 12×10⁻ in their coefficients of thermal expansion. 6 / K, the top edge ring 31 and the mold core 32 are cast as a single piece.

[0032] The bottom mold 3 has an annular sheet structure. At least one injection port 34 communicating with the mold groove 33 is opened on the side of the bottom mold 3 away from the mold core 32. The injection port 34 is used to inject the composite material into the mold cavity 4 during the molding stage to ensure that the material fully fills all parts of the mold cavity 4. It is connected with the mold groove 33 to facilitate the injection of gas from the same path during demolding, forming a uniform air cushion, pushing the skin to separate smoothly along the surface of the mold core 32, improving the integrity and efficiency of demolding.

[0033] The mold frame 2 is detachably mounted on one side of the mold core 32 of the bottom mold 3; The mold frame 2 has four corners near the top mold 1 with recessed holes 21 for accommodating springs 5. The two ends of the springs 5 ​​abut against the top mold 1 and the mold frame 2 respectively. The springs 5 ​​provide initial elastic thrust when the mold is opened, which helps the top mold 1 and the mold frame 2 to separate initially and reduce the mold opening resistance. At the same time, the springs 5 ​​play a buffering and pre-tightening role when the mold is closed, which enhances the overall closing stability of the mold and prevents the mold cavity 4 from being misaligned due to uneven pressure.

[0034] The top mold 1 is detachably mounted on the side of the mold frame 2 away from the bottom mold 3; The top mold 1 is provided with a positioning ring 12 that is at least partially embedded in the countersunk hole 21 on the side of the top mold 1 near the mold frame 2. The positioning ring 12 cooperates with the countersunk hole 21 to achieve precise positioning between the top mold 1 and the mold frame 2, ensuring that the mold cavity 4 can remain aligned during multiple mold opening and closing processes, preventing uneven skin thickness or structural defects caused by misalignment; at the same time, it enhances the overall rigidity of the mold and reduces deformation.

[0035] Several air holes 11 are provided in the forming surface of the top mold 1 on the side close to the mold frame 2. The air holes 11 are distributed in the key area of ​​the forming surface. When demolding, controllable air pressure is introduced. The gas acts evenly on the back of the skin through the air holes 11, forming a local air cushion effect, which effectively reduces the contact area and adhesion force between the skin and the mold surface, thereby achieving smooth demolding without damage to the skin.

[0036] like Figure 3 , 4 As shown, the bottom mold 3 has four corner positions near the mold frame 2, and there are countersunk platforms corresponding to the springs 5. Threaded holes for fastening the screw thread connection are opened on the countersunk platforms.

[0037] In this embodiment, the side of the top mold 1 away from the mold base 2 is the direction in which the fastening screw passes through, such as... Figure 4 As shown, stepped holes 13 are provided at the four corners of the top mold 1 on the side away from the mold frame 2 to accommodate bolts.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An air cushion ejection mechanism for demolding the skin of an aircraft model, characterized in that... ,include: The bottom mold (3) has a cubic plate-shaped structure. A mold core (32) is provided at the center of the top surface of the bottom mold (3). A mold groove (33) is provided around the bottom edge of the mold core (32). A top edge ring (31) with a different expansion coefficient than the mold core (32) is provided at the top edge of the mold core (32). The mold frame (2) is detachably mounted on one side of the mold core (32) of the bottom mold (3); The top mold (1) is detachably disposed on the side of the mold frame (2) away from the bottom mold (3); The four corners of the bottom mold (3), the mold frame (2) and the top mold (1) are fixedly connected by fixing bolts. The bottom mold (3), the mold frame (2) and the top mold (1) overlap each other in sequence to form a mold cavity (4) in the mold.

2. The air cushion ejection mechanism for demolding aircraft model skin according to claim 1, characterized in that: The bottom mold (3) has an annular sheet structure, and at least one injection port (34) communicating with the mold groove (33) is opened on the side of the bottom mold (3) away from the mold core (32).

3. The air cushion ejection mechanism for demolding aircraft model skin according to claim 2, characterized in that: The mold frame (2) has recessed holes (21) for accommodating springs (5) at the four corners of the side near the top mold (1). The two ends of the springs (5) abut against the top mold (1) and the mold frame (2) respectively.

4. The air cushion ejection mechanism for demolding aircraft model skin according to claim 3, characterized in that: The top mold (1) is provided with a positioning ring (12) that is at least partially embedded in the countersunk hole (21) on the side of the mold frame (2) near the mold frame (2).

5. The air cushion ejection mechanism for demolding aircraft model skin according to claim 1, characterized in that: The top mold (1) has several air holes (11) on the forming surface on the side close to the mold frame (2).

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