A liquid molding tooling and molding method for an aileron structural member

Abstract

The present invention discloses a liquid molding tooling for an aileron structural member and a molding method. The tooling includes a lower mold, an upper mold detachably connected to the lower mold, end stoppers, a liquid channel, and a plurality of core molds. The top surface of the lower mold is provided with a lower surface working area; the bottom surface of the upper mold is provided with an upper surface working area, and a molding area is formed between the upper surface working area and the lower surface working area; the end stoppers are arranged at both ends inside the molding area; the size of the core mold gradually increases from one end to the other end, a bag tube is sleeved on the outer periphery of the core mold, and both ends of the core mold are connected to the end stoppers; the liquid channel includes a glue inlet channel and a glue outlet channel communicating with the molding area, and the horizontal height of the glue outlet of the glue outlet channel is higher than the horizontal height of the glue inlet of the glue inlet channel. The tooling has a simple structure, is simple and convenient to use, and can integrally mold the aileron structural member.

Description

Technical Field

[0001] The present invention relates to the technical field of composite part forming tooling, and particularly relates to a liquid forming tooling for aileron structural parts and a forming method thereof. Background Art

[0002] Carbon fiber composite ailerons usually have multiple cavities and are composed of beams, ribs and upper and lower skins. After each part is formed separately, they are assembled by gluing or fitting. Usually, multiple sets of forming and assembly toolings are required for aileron production, resulting in a complex production process, a long production cycle and high costs.

[0003] How to design a set of forming tooling that can solve the complex forming process of aileron parts and enable the integral forming of aileron structural parts is a problem that needs to be solved. Summary of the Invention

[0004] The purpose of the present invention is to provide a liquid forming tooling for aileron structural parts and a forming method thereof, so as to solve the problems of complex forming of aileron parts and difficulty in integral forming in the prior art.

[0005] To achieve the above purpose, the present invention is implemented by the following technical solutions:

[0006] A liquid forming tooling for aileron structural parts, comprising:

[0007] A lower die, on the top surface of which there is a lower surface working area;

[0008] An upper die detachably connected to the lower die, on the bottom surface of which there is an upper surface working area, and a forming area is formed between the upper surface working area and the lower surface working area;

[0009] End stoppers arranged at both ends inside the forming area;

[0010] A plurality of core molds, the sizes of which gradually increase from one end to the other end, a bag tube is sleeved on the outer periphery of the core molds, and both ends of the core molds are connected to the end stoppers;

[0011] A liquid channel, including a glue inlet channel and a glue outlet channel communicating with the forming area, and the horizontal height of the glue outlet of the glue outlet channel is higher than the horizontal height of the glue inlet of the glue inlet channel.

[0012] Further, the glue inlet channel is at least one glue inlet sleeve penetrating through the top surface of the upper die;

[0013] The glue outlet channel is a plurality of second glue outlet sleeves penetrating through the top surface of the upper die, and the plurality of second glue outlet sleeves are arranged along the length direction of the core mold.

[0014] Further, a glue outlet runner is provided at the large end of the core mold, and the glue outlet channel further includes a first glue outlet rubber sleeve located above the glue outlet runner.

[0015] Further, a lower sealing groove is provided around the working area of the mold surface of the lower mold, and an upper sealing groove is provided around the working area of the mold surface of the upper mold. Fluororubber sealing strips are connected in both the upper sealing groove and the lower sealing groove.

[0016] Further, straight guide pillars are provided on the top surface of the lower mold, and shoulder guide sleeves are provided on the outer periphery of the straight guide pillars. Through holes adapted to the shoulder guide sleeves are provided on the upper mold.

[0017] Further, precision locator pins are provided on the top surface of the lower mold, and precision locator sleeves are provided on the outer periphery of the precision locator pins. A positioning mold surface adapted to the precision locator sleeves is provided on the bottom surface of the upper mold.

[0018] Further, universal lifting rings are connected to both the lower mold and the upper mold.

[0019] Further, the thermal expansion coefficient of the core mold is greater than that of the upper mold and the lower mold.

[0020] Further, the core mold is a core mold made of aluminum alloy, the upper mold is an upper mold made of steel, and the lower mold is a lower mold made of steel.

[0021] The present invention also discloses a forming method for an aileron structural member, including the following steps:

[0022] Respectively sleeving a plurality of core molds into bag tubes of corresponding sizes;

[0023] Laying an aileron lower skin on the lower mold surface working area of the lower mold, placing the core mold with the bag tube on the lower skin, and fixing the core mold through end blocks;

[0024] Laying an upper skin on the core mold, and closing the upper mold and the lower mold;

[0025] Filling the forming area between the upper mold and the lower mold with resin;

[0026] Obtaining the aileron structural member after curing with heat preservation and pressure increase.

[0027] According to the above technical solution, the embodiments of the present invention have at least the following effects:

[0028] 1. The tooling designed in this application, through the structural design of one end of the core mold being large and the other end being small and the sleeve, facilitates the sleeving of the sleeve before molding and the removal of the core mold after molding. The core mold is fixed by the end stop block, ensuring the installation and fixation effect of the core mold, preventing the core mold from shifting during the molding process, and ensuring the molding quality of the aileron component. Through the design of the liquid channel, it is convenient to introduce the colloid into the molding area, ensuring the stable progress of molding;

[0029] 2. Through the design form that the horizontal height of the glue outlet channel is higher than the horizontal height of the glue inlet channel, it can ensure that the molding area is filled with colloid and guarantee the molding effect of the aileron component;

[0030] 3. The structure of this tooling is simple. The upper mold and the lower mold are detachable, which is convenient for placing the core mold and removing the aileron component after molding. After placing the core mold in the molding area and fixing it with the end stop block, then covering the upper mold, the subsequent molding can be carried out. It is simple and convenient to use, solves the problem of multi-cavity high-precision one-piece molding of aileron-like structural parts, and realizes the one-time liquid molding of the inner and outer surfaces of aileron-like structural parts against the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is an axonometric view of the aileron structural part in the specific embodiment of the present invention;

[0032] Figure 2 It is a connection schematic diagram of the core mold and the bag tube in the specific embodiment of the present invention;

[0033] Figure 3 For Figure 2 Partial enlarged view;

[0034] Figure 4 It is a structural schematic diagram of the molding tooling with the upper mold removed in the specific embodiment of the present invention;

[0035] Figure 5 It is a structural schematic diagram of the molding tooling in the specific embodiment of the present invention;

[0036] Figure 6 It is a cross-sectional view of the molding tooling in the specific embodiment of the present invention.

[0037] Wherein: 1. Lower mold; 2. Upper mold; 3. End stop block; 4. Core mold Ⅰ; 5. Core mold Ⅱ; 6. Core mold Ⅲ; 7. Core mold Ⅳ; 8. Core mold Ⅴ; 9. Glue outlet channel; 10. Glue inlet channel; 11. Precision locator pin; 12. Precision locator sleeve; 13. Straight guide pillar; 14. Shoulder guide sleeve; 15. Fluororubber sealing strip; 16. Universal lifting ring; 17. Bolt; 18. Washer; 19. O-ring; 20. First glue outlet rubber sleeve; 21. Thermocouple hole; 22. Aileron structural part; 23. Bag tube; 24. Second glue outlet rubber sleeve; 25. Glue inlet rubber sleeve. SPECIFIC EMBODIMENTS

[0038] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0039] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "front", "rear", "left", "right", "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and does not require the present invention to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. The terms "front", "rear", "left", "right", "upper", "lower" used in the description of the present invention refer to the directions in the drawings, and the terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component.

[0040] A liquid molding tooling for a aileron carbon structure member of the present application can integrally mold the aileron structure member, produce qualified carbon fiber composite aileron structure members, and improve the structural performance of the produced carbon fiber composite aileron structure members.

[0041] As Figures 2 to 6 shown, a liquid molding tooling for an aileron structure member includes a lower mold 1, an upper mold 2 detachably connected to the lower mold 1, end stoppers 3, a liquid channel, and a plurality of core molds. A lower surface working area is provided on the top surface of the lower mold 1; an upper surface working area is provided on the bottom surface of the upper mold 2, and a molding area is formed between the upper surface working area and the lower surface working area; the end stoppers 3 are arranged at both ends inside the molding area; the size of the core mold gradually increases from one end to the other end, a bag tube 23 is sleeved on the outer periphery of the core mold, and both ends of the core mold are connected to the end stoppers 3; the liquid channel includes a glue inlet channel and a glue outlet channel communicating with the molding area, and the horizontal height of the glue outlet of the glue outlet channel is higher than the horizontal height of the glue inlet of the glue inlet channel.

[0042] The structure of this tooling is simple. The upper mold and the lower mold are designed to be detachable, which is convenient for placing the core mold and taking out the aileron part after molding. After placing the core mold in the molding area and fixing it with the end stoppers and then covering the upper mold, subsequent molding can be carried out. It is simple and convenient to use and can integrally mold the aileron structure member.

[0043] The molding tooling of the present invention mainly consists of an upper mold 2, a lower mold 1, a core mold, a guiding member, a positioning member, a sealing member, a liquid channel, and standard parts, etc. The guiding member and the positioning member facilitate the mold closing of the upper mold 2 and the lower mold 1, and the sealing member can ensure the sealing effect after the upper mold 2 and the lower mold 1 are closed, ensure the sealing of the molding area, and prevent the molding colloid in the molding area from flowing out.

[0044] In this application, the core mold has five designs, specifically including core mold Ⅰ4, core mold Ⅱ5, core mold Ⅲ6, core mold Ⅳ7, and core mold Ⅴ8. In some other embodiments, the number of core molds can be appropriately increased or decreased, such as designing four core molds or six core molds. The number of core molds is mainly designed according to the size of the aileron structural member.

[0045] In this application, the size of the core mold gradually increases from one end to the other. This design method facilitates the sleeving of the bag tube 23 on the core mold, and moreover, when the aileron structural member is formed, it is convenient to remove the core mold from the large end.

[0046] In this application, the liquid channel is used to realize the inlet and outlet of the colloid, ensuring that the colloid can smoothly fill the entire forming area and guaranteeing the forming effect of the aileron structural member. Designing the horizontal height of the out-gel channel higher than that of the in-gel channel can ensure that the forming area is filled with colloid and guarantee the forming effect of the aileron structural member.

[0047] In some further embodiments, both the in-gel channel and the out-gel channel adopt the design method of a gel sleeve. An O-ring seal 19 can be designed in the gel sleeve to ensure the in-gel and out-gel effects. The in-gel sleeve 25 can be designed on the upper mold 2 or on the lower mold 1, as long as it can make the gel enter the forming area. The gel sleeve of the out-gel channel is designed on the upper mold 2, so that the gel sleeve of the out-gel channel is connected to the higher position of the horizontal height of the forming area to ensure that the forming area can be filled with colloid and guarantee the forming effect of the aileron structural member.

[0048] Further, the gel sleeve of the out-gel channel includes a first out-gel sleeve 20 and a second out-gel sleeve 24. The second out-gel sleeve 24 is designed along the length direction of the core mold and is designed at a higher position of the horizontal height of the upper mold 2 (higher than the horizontal height of the in-gel sleeve 25).

[0049] An out-gel flow channel 9 is provided at the large end of the core mold. The out-gel flow channel 9 is a notch designed at the large end of the core mold. For example, in this embodiment, there are five core molds. Correspondingly, five first out-gel sleeves 20 are designed on the upper mold 2. Each first out-gel sleeve 20 is located above an out-gel flow channel 9. Through the design of the out-gel flow channel with a notch and the corresponding design of the first out-gel sleeve 20, the out-gel effect can be effectively guaranteed. By designing multiple notches and the corresponding first out-gel sleeves 20, air bubbles in the forming area can be prevented, ensuring the forming quality of the aileron structural member 22.

[0050] In some further embodiments, an in-gel flow channel 10 designed along the length direction of the core mold is also designed. The in-gel flow channel is located in the forming area and is connected to the in-gel sleeve 25 at one end. By designing the in-gel flow channel 10, the resin entering the forming area from the in-gel sleeve 25 can flow quickly in the forming area and impregnate every part of the carbon fiber fabric of the aileron structural member.

[0051] In some embodiments, the seal is designed in the form of a sealing strip. Further, a lower sealing groove is provided around the working area of the surface of the lower mold 1, and an upper sealing groove is provided around the working area of the surface of the upper mold 2. Fluororubber sealing strips 15 are connected in both the upper sealing groove and the lower sealing groove. When the upper mold 2 and the lower mold 1 are clamped, the fluororubber sealing strips 15 can ensure the sealing effect of the molding area.

[0052] In some embodiments, the positioning member adopts the method of primary positioning and precise positioning. The primary positioning is the straight guide post 13 designed on the top surface of the lower mold 1 and the shoulder guide sleeve 14 arranged on the outer periphery of the straight guide post 13. A through hole adapted to the shoulder guide sleeve 14 is provided on the upper mold 2. When clamping the mold, the upper mold is moved onto the lower mold, and the upper mold is initially positioned through the cooperation of the through hole and the shoulder guide sleeve 14, which is convenient for installing the upper mold 2 onto the lower mold 1.

[0053] Further, a precise positioning pin 11 is provided on the top surface of the lower mold 1, and a precise positioning sleeve 12 is arranged on the outer periphery of the precise positioning pin 11. A positioning surface adapted to the precise positioning sleeve 12 is provided on the bottom surface of the upper mold 2. Specifically, the top of the precise positioning sleeve 12 is a conical structure, and the positioning surface is a conical groove to be adapted to the precise positioning sleeve. Through the design of primary positioning and precise positioning, the clamping effect of the upper mold 2 and the lower mold 1 can be ensured quickly and accurately.

[0054] After clamping the mold, in order to ensure the tight connection between the upper mold 2 and the lower mold 1 and the sealing effect at the fluororubber sealing strip 15, it is fastened by bolts and washers. The bolts can penetrate through the upper mold 2 and be connected to the screw holes of the lower mold 1 to achieve the sealing of the two.

[0055] In some embodiments, the bag tube 23 is selected as a carbon fiber fabric bag tube. The carbon fiber fabric bag tube ensures the fabric continuity and cavity size, and improves the mechanical properties of the workpiece. In some embodiments, in order to facilitate lifting the upper mold 2 or the lower mold 1, universal lifting rings 16 are also designed on the upper mold 2 and the lower mold 1.

[0056] In some embodiments, the thermal expansion coefficient of the core mold is greater than that of the upper mold 2 and the lower mold 1. It is ensured that the expansion amount of the core mold is greater than that of the upper mold 2 and the lower mold 1 during the heating and curing process, providing auxiliary pressure for the forming of the aileron structure workpiece, and the shrinkage amount of the core mold is greater than that of the upper mold 2, the lower mold 1 and the aileron structure workpiece during the cooling and demolding process after curing, which is convenient for the core mold to be removed.

[0057] Further, the core mold is a core mold made of aluminum alloy material, the upper mold 2 is an upper mold made of steel, and the lower mold 1 is a lower mold made of steel.

[0058] In some embodiments, a thermocouple hole 21 is also designed on the upper mold 2. A thermocouple can be inserted into the thermocouple hole 21 to monitor in real time whether the curing program reaches the expected temperature during the curing process.

[0059] Based on the above-mentioned forming tooling, the present application also discloses a forming method, which includes the following steps: respectively sleeving a plurality of bag tubes 23 on the outer periphery of a plurality of core molds; laying the lower skin of the aileron on the working area of the lower surface of the lower mold 1, and sequentially placing the plurality of core molds with bag tubes 23 on the lower skin in the order from large to small, and leaving a gap between two adjacent core molds, and then fixing the core molds by end blocks 3; laying the upper skin on the core molds, and closing the upper mold 2 and the lower mold 1; filling the forming area between the upper mold 2 and the lower mold 1 with resin through the glue injection channel; obtaining the finished aileron structural member 22 after curing under heat preservation and pressure increase.

[0060] Specifically, first, the bag tubes 23 woven according to the dimensional requirements are respectively sleeved on each core mold from the small end of the core mold, and the core molds with bag tubes 23 are encapsulated to make bags, so that the carbon fiber fabric bag tubes are pre-compacted to meet the requirements of the aileron beam closing mold size.

[0061] Lay the carbon fiber fabric of the lower skin panel of the aileron on the working area of the lower surface of the lower mold 1, and place the pre-compacted carbon fiber fabric bag tubes 23 together with the core molds on the lower mold 1 of the forming tooling on which the carbon fiber fabric of the lower skin panel has been laid, and position each core mold with the lower mold 1 through the end block 3 and the two ends of the card slots to ensure the accurate position of each core mold.

[0062] Then lay the carbon fiber fabric of the upper skin panel on the bag tubes of the positioned core mold group. After all the fabrics are laid, hoist the upper mold 2 onto the lower mold 1 and the core mold group through the universal lifting ring 16. The lower mold 1 and the upper mold 2 are closed, guided, positioned and locked through the straight guide posts 13 and the shoulder guide sleeves 14, the precision locator pins 11 and the precision locator sleeves 12, the bolts 17, the washers 18, etc. All parts of the mold need to be assembled reliably and the position is accurate to ensure that the step difference of the docking surface and the gap of the closing mold seam meet the requirements.

[0063] Sealing grooves are provided in the fitting area outside the forming surfaces of the lower mold 1 and the upper mold 2 for placing fluororubber sealing strips 15 to ensure the airtightness of the closed cavity. At a certain temperature, resin at a certain pressure is introduced in a predetermined order from low to high and from the small end to the large end. The resin is injected into the cavity from the glue injection rubber sleeve 25 and flows through the glue injection channel 10 and gradually impregnates every part of the carbon fiber fabric of the aileron structural member 22. When resin overflows from the first glue outlet rubber sleeve 20 at one end of the core mold V8, close the first glue outlet rubber sleeve 20 and let the resin continue to flow in the closed cavity. Similarly, when the carbon fiber fabric on the outer surfaces of the core mold IV7, the core mold III6, and the core mold II5 is completely impregnated, close the first glue outlet rubber sleeve 20 at the corresponding position of the core mold. When the aileron structural member 22 is completely impregnated, the resin will overflow and flow out from the second glue outlet rubber sleeve 24 at the high point through the glue outlet channel 9. When the defoaming of the flowing resin ends, close the valves of the inlet and outlet liquid pipelines and keep the pressure and raise the temperature to reach the curing conditions of the aileron structural member 22.

[0064] After the aileron structural member 22 is cured and formed, the dismounting bolt 17 is removed and shifted away by using the universal sling ring 16 of the hoisting upper die 2. Then, the core mold set together with the aileron structural member 22 is hoisted and shifted from the lower die 1 to the fixing rack. On the fixing rack, the core mold I 4, the core mold II 5, the core mold III 6, the core mold IV 7, and the core mold V 8 are respectively drawn out of the large end of the aileron structural member 22 along the length direction of each core mold one by one for demolding.

[0065] As is known by common technical knowledge, the present invention can be implemented by other embodiments that do not depart from its spiritual essence or essential features. Therefore, the above-disclosed embodiments are illustrative in all aspects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are encompassed by the present invention.

Claims

1. A liquid molding tooling for an aileron structural member, characterized in that, Comprising: A lower mold (1), on the top surface of the lower mold (1) there is a lower mold surface working area; An upper mold (2) detachably connected to the lower mold (1), on the bottom surface of the upper mold (2) there is an upper mold surface working area, and a forming area is formed between the upper mold surface working area and the lower mold surface working area; End stoppers (3), the end stoppers (3) are arranged at both ends inside the forming area; Multiple core molds, the size of the core molds gradually increases from one end to the other end, a bag tube (23) is sleeved on the outer periphery of the core molds, and both ends of the core molds are connected to the end stoppers (3); A liquid channel, including a glue inlet channel and a glue outlet channel communicating with the forming area, and the horizontal height of the glue outlet of the glue outlet channel is higher than the horizontal height of the glue inlet of the glue inlet channel; The glue inlet channel is at least one glue inlet sleeve (25) penetratingly arranged on the top surface of the upper mold (2); The glue outlet channel is multiple second glue outlet sleeves (24) penetratingly arranged on the top surface of the upper mold (2), and the multiple second glue outlet sleeves (24) are arranged along the length direction of the core mold; 2. The liquid molding tooling for the aileron structural member according to claim 1, characterized in that, A glue outlet flow channel (9) is arranged at the large end of the core mold, and the glue outlet channel further includes a first glue outlet sleeve (20) located above the glue outlet flow channel (9); 3. The liquid molding tooling for the aileron structural member according to claim 1, wherein, A lower sealing groove is arranged around the mold surface working area of the lower mold (1), an upper sealing groove is arranged around the mold surface working area of the upper mold (2), and fluororubber sealing strips (15) are connected in both the upper sealing groove and the lower sealing groove; 4. The liquid molding tooling for the aileron structural member according to claim 1, wherein, A straight guide post (13) is arranged on the top surface of the lower mold (1), and a shoulder guide sleeve (14) is arranged on the outer periphery of the straight guide post (13), and a through hole adapted to the shoulder guide sleeve (14) is arranged on the upper mold (2); 5. The liquid molding tooling for the aileron structural member according to claim 3, wherein A precision locator pin (11) is arranged on the top surface of the lower mold (1), and a precision locator sleeve (12) is arranged on the outer periphery of the precision locator pin (11), and a positioning mold surface adapted to the precision locator sleeve (12) is arranged on the bottom surface of the upper mold (2); 6. The liquid molding tooling for the aileron structural member according to claim 1, characterized in that, Universal lifting rings (16) are connected to both the lower mold (1) and the upper mold (2); 7. The liquid molding tooling for the aileron structural member according to claim 1, wherein The coefficient of thermal expansion of the core mold is greater than the coefficient of thermal expansion of the upper mold (2) and the lower mold (1); 8. The liquid molding tooling for the aileron structural member according to claim 7, wherein, The core mold is a core mold made of aluminum alloy material, the upper mold (2) is an upper mold made of steel material, and the lower mold (1) is a lower mold made of steel material; 9. A method for forming an aileron structural member using the liquid molding tooling for an aileron structural member according to any one of claims 1 to 8, characterized in that, Including the following steps: Respectively sleeving multiple core molds into corresponding-sized bag tubes (23); Laying the lower skin of the aileron on the lower mold surface working area of the lower mold (1), placing the core mold with the bag tube (23) on the lower skin, and fixing the core mold through the end stoppers (3); Laying the upper skin on the core mold, and closing the upper mold (2) and the lower mold (1); Filling the forming area between the upper mold (2) and the lower mold (1) with resin; Obtaining the aileron structural member (22) after heat preservation, pressure increase and curing.

Images