Helicopter mid-fuselage shell forming die

Abstract

The application relates to the technical field of helicopter component manufacturing, in particular to a forming die for a middle section shell of a helicopter, which comprises a first die formed with a first groove group; a second die detachably and sealingly connected to the first die and surrounding a forming cavity with the first die, the second die being formed with a second groove group, the second groove group and the first groove group being spliced to form a forming groove group in the forming cavity; and a filling component detachably connected in the forming groove group. The first die and the second die are connected as a whole, a forming cavity for manufacturing the middle section shell is formed between the two, the middle section shell is formed with a forming hole, and the forming hole is formed through the filling component arranged in the forming groove group. The middle section shell formed in this way is of an integral structure, does not have a lap joint and a connecting position, and therefore cannot cause warping deformation and misalignment at the lap joint, cracking and deformation at the connecting position, and the integral structure makes the overall fiber direction continuous, thereby avoiding affecting the mechanical properties.

Description

Technical Field

[0001] This application relates to the field of helicopter component manufacturing technology, and in particular to a molding die for a helicopter midsection shell. Background Technology

[0002] The mid-section shell is a core component of the unmanned helicopter's fuselage structure, typically located in the middle of the airframe. It connects the front and rear sections and provides necessary structural support and internal space layout. The mid-section shell is often made of composite materials such as carbon fiber reinforced polymer (CFRP) or glass fiber reinforced polymer (GFRP) to leverage the high specific strength, high specific modulus, and lightweight advantages of composite materials, meeting the weight reduction and performance requirements of the aerospace industry. In terms of molding processes, a common method is to mold the mid-section shell into two separate parts, left and right, and then join them together by overlapping. Due to internal stress and mold precision issues, the overlapping area is prone to warping, deformation, and misalignment, while the joint is susceptible to cracking and deformation. Furthermore, the separate fabrication of the two parts results in discontinuous fiber orientation at the joint, significantly impacting mechanical properties. Summary of the Invention

[0003] This application provides a molding die for the mid-section shell of a helicopter, which solves the problems in the prior art where the mid-section shell is formed by splicing two halves, such as easy warping and deformation at the overlapping edge, easy cracking and deformation at the joint, and discontinuous fiber direction between the two parts.

[0004] This application provides a molding die for a mid-section shell of a helicopter, comprising: a first die having a first set of grooves; a second die being detachably and sealingly connected to the first die, and the two forming a molding cavity, the second die having a second set of grooves, the second set of grooves being joined with the first set of grooves to form a molding groove set located within the molding cavity; and a filling member being detachably connected within the molding groove set, the filling member being configured to be located within a molding hole of the mid-section shell formed within the molding cavity.

[0005] Preferably, the molding groove group includes a first groove, a second groove, and a third groove. The first groove group includes a first recess, a second recess, and a third recess. The second groove group includes a fourth recess that is joined with the first recess to form a first groove, a fifth recess that is joined with the second recess to form a second groove, and a sixth recess that is joined with the third recess to form a third groove. The filling component includes a first filling block that is fitted into the first groove, a second filling block that is fitted into the second groove, and a third filling block that is fitted into the third groove.

[0006] Preferably, the edge of the first filler block is formed as a slope, which is inclined in a direction toward the molding cavity and away from the center of the first filler block; and / or, the edge of the second filler block is formed as a slope, which is inclined in a direction toward the molding cavity and away from the center of the second filler block.

[0007] Preferably, the first mold has a first connecting edge protruding from its edge, and a first half-groove is formed on the first connecting edge; the second mold has a second connecting edge protruding from its edge, which fits against the first connecting edge, and a second half-groove is formed on the second connecting edge; the first half-groove and the second half-groove are joined together to form a sealing groove; the helicopter mid-section shell forming mold also includes a sealing strip disposed in the sealing groove.

[0008] Preferably, the first connecting edge and the second connecting edge are formed in a one-to-one correspondence, and each first connecting edge and its corresponding second connecting edge are spliced ​​together to form a sealing groove.

[0009] Preferably, a first connecting hole is formed on the first connecting edge, and a second connecting hole coaxial with the first connecting hole is formed on the second connecting edge, and the first mold and the second mold are connected through the first connecting hole and the second connecting hole.

[0010] Preferably, a first positioning groove is formed on the first connecting edge, and a second positioning groove is formed on the second connecting edge. The first positioning groove and the second positioning groove are joined together to form a positioning hole. The helicopter mid-section shell forming mold also includes a positioning component disposed in the positioning hole.

[0011] Preferably, the helicopter mid-section shell molding mold further includes a first reinforcing rib disposed on the side of the first mold opposite to the molding cavity and a second reinforcing rib disposed on the side of the second mold opposite to the molding cavity.

[0012] Preferably, the first reinforcing rib and / or the second reinforcing rib are formed into a mesh structure.

[0013] Preferably, the helicopter mid-section shell forming mold further includes a first front support rib and a first rear support rib disposed on the side of the first mold away from the forming cavity, the two being spaced apart, and the end faces of the first front support rib and the first rear support rib that are away from the first mold are flush with each other to support the first mold to be placed horizontally; and / or, the helicopter mid-section shell forming mold further includes a second front support rib and a second rear support rib disposed on the side of the second mold away from the forming cavity, the two being spaced apart, and the end faces of the second front support rib and the second rear support rib that are away from the second mold are flush with each other to support the second mold to be placed horizontally.

[0014] The beneficial effects of this application are as follows: The first and second molds are connected as one unit, forming a molding cavity for creating the middle shell. The middle shell has molding holes formed by a filling component located within the molding groove assembly. While the middle shell is being manufactured in the molding cavity, the filling component occupies the space required for the molding holes. After the middle shell is formed, the first and second molds are separated to facilitate removal from the middle shell. The filling component is then removed, and the molding holes are formed on the middle shell, completing the middle shell manufacturing process. This results in a one-piece middle shell structure without overlaps or joints, thus preventing warping, misalignment, cracking, and deformation at overlaps or joints. Furthermore, the one-piece structure ensures continuous fiber direction, preventing any impact on mechanical properties. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 A perspective view of the mid-section shell manufactured using the mid-section shell molding mold provided in the embodiments of this application; Figure 2 A perspective view of the mating of the helicopter mid-section shell molding die and the mid-section shell provided in an embodiment of this application; Figure 3 A perspective view of a helicopter midsection shell molding die provided in an embodiment of this application; Figure 4 for Figure 3 A 3D view of the helicopter midsection shell molding mold after the filling components have been removed; Figure 5 for Figure 4 A magnified view of part A in the image; Figure 6 for Figure 3 A perspective view of the first mold, the first reinforcing rib, the first front support rib, and the first rear support rib of the helicopter midsection shell forming mold; Figure 7 for Figure 6 A magnified view of part B in the image; Figure 8 for Figure 6 A stereoscopic view from another perspective; Figure 9 for Figure 3 A perspective view of the second mold, second reinforcing rib, second front support rib, and second rear support rib of the mid-section shell forming mold for a helicopter. Figure 10 for Figure 9 A magnified view of part C; Figure 11 for Figure 9 A stereoscopic view from another perspective; Figure 12 for Figure 3 A perspective view of the first filling block of the mid-section shell molding die for a helicopter. Figure 13 for Figure 3 A perspective view of the second filling block of the mid-section shell molding die for a helicopter. Figure 14 for Figure 13 A stereoscopic view from another perspective; Figure 15 for Figure 3 A perspective view of the third filling block of the mid-section shell molding die for a helicopter; and Figure 16 for Figure 3 A perspective view of the positioning components of the mid-section shell forming mold for a helicopter. Figure label: 10. First mold; 11. First groove group; 111. First groove; 112. Second groove; 113. Third groove; 12. First connecting edge; 121. First half groove; 122. First connecting hole; 123. First positioning groove; 20. Second mold; 21. Second groove group; 211. Fourth groove; 212. Fifth groove; 213. Sixth groove; 22. Second connecting edge; 221. Second half groove; 222. Second connecting hole; 223. Second positioning groove; 30. Molding groove assembly; 31. First type groove; 32. Second type groove; 33. Third type groove; 40. Filling component; 41. First filling block; 42. Second filling block; 421. Weight reduction groove; 43. Third filling block; 50. Sealing groove; 60. Positioning component; 61. Pin; 62. Pin sleeve; 70. First reinforcing rib; 80. Second reinforcing rib; 90. First front support rib; 100. First rear support rib; 110. Second front support rib; 120. Second rear support rib; 9. Middle section outer shell; 91. Forming hole. Detailed Implementation

[0017] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] The following is combined Figures 1 to 16 This application describes a helicopter midsection shell molding die provided in an embodiment, comprising: a first die 10 having a first groove group 11; a second die 20 being detachably and sealingly connected to the first die 10, and the two forming a molding cavity, the second die 20 having a second groove group 21, the second groove group 21 being spliced ​​with the first groove group 11 to form a molding groove group 30 located in the molding cavity; and a filling member 40 being detachably connected to the molding groove group 30, the filling member 40 being configured to be located in the molding hole 91 of the midsection shell 9 formed in the molding cavity.

[0019] The first mold 10 and the second mold 20 are connected to form a molding cavity for making the middle shell 9. The middle shell 9 is formed by adhering to the cavity wall of the molding cavity. The filling component 40 in the molding groove assembly 30 protrudes towards the inside of the molding cavity, so that the middle shell 9 can only be formed along the outer edge of the filling component 40 during the molding process, that is, forming the molding hole 91 on the middle shell 9. After the middle shell 9 is formed, the first mold 10 and the second mold 20 are first separated and removed from the middle shell 9 to achieve demolding. Then, the filling component 40 located in the molding hole 91 of the middle shell 9 is pulled out to obtain the middle shell 9. The middle shell 9 formed in this way is integrally molded without overlaps or joints, so it will not cause warping or misalignment at the overlaps, or cracking or deformation at the joints. In addition, the overall structure makes the fiber direction continuous, avoiding the impact on the mechanical properties.

[0020] The filling component 40 can be detachably connected to the molding groove assembly 30 by either placing it inside the molding groove assembly 30 or fixing it inside the molding groove assembly 30 with screws. That is, both the filling component 40 and the bottom of the molding groove form threaded holes, and the screws are screwed into the threaded holes of both.

[0021] Specifically, the first mold 10 and the second mold 20 are both integrally cast and can be made of cast aluminum or cast iron, with a thickness of 10mm to 30mm.

[0022] Please refer to Figures 2 to 4 , Figure 6 and Figure 9 , Figures 13 to 15 ,in, Figure 2 This is a perspective view of the fitting of the mid-section shell molding mold and the mid-section shell 9. Figure 3 This is a 3D view of the molding die for the midsection of a helicopter. Figure 4 A perspective view of the helicopter midsection outer shell molding die after removing the infill component 40. Figure 6 This is a three-dimensional view of the first mold 10, the first reinforcing rib 70, the first front support rib 90, and the first rear support rib 100. Figure 9 This is a perspective view of the second mold 20, the second reinforcing rib 80, the second front support rib 110, and the second rear support rib 120. Figure 13 and Figure 14 All are 3D views of the second filling block 42. Figure 15 This is a 3D view of the third filler block 43.

[0023] In some embodiments provided in this application, the molding groove group 30 includes a first groove 31, a second groove 32 and a third groove 33, the first groove group 11 includes a first groove 111, a second groove 112 and a third groove 113, the second groove group 21 includes a fourth groove 211 that is spliced ​​with the first groove 111 to form the first groove 31, a fifth groove 212 that is spliced ​​with the second groove 112 to form the second groove 32 and a sixth groove 213 that is spliced ​​with the third groove 113 to form the third groove 33, and the filling component 40 includes a first filling block 41 that is fitted in the first groove 31, a second filling block 42 that is fitted in the second groove 32 and a third filling block 43 that is fitted in the third groove 33.

[0024] The middle section shell 9 has three molding holes 91 located at different positions, formed by splicing the first mold 10 and the second mold 20 to form a first groove 31, a second groove 32, and a third groove 33, and a first filling block 41, a second filling block 42, and a third filling block 43 respectively disposed in the three grooves. The first groove 111 and the second groove 112 are both formed on the inner side of the first mold 10, the third groove 113 is formed at the end of the first mold 10, the fourth groove 211 and the fifth groove 212 are both formed on the inner side of the second mold 20, and the sixth groove 213 is formed at the end of the second mold 20, so that the first filling block 41 inside the first groove 31 and the first filling block 41 inside the second groove 32 form the molding holes 91 on the side of the middle section shell 9, and the third filling block 43 inside the third groove 33 forms the molding holes 91 at the end of the middle section shell 9.

[0025] The first groove 31, the second groove 32 and the third groove 33 are spliced ​​together by grooves formed on the first mold 10 and the second mold 20 respectively. They are used so that the first mold 10 and the second mold 20 can be separated from the sides of the filling component 40 during demolding and will not be blocked by the filling component 40, thereby achieving convenient demolding.

[0026] Specifically, the first filler block 41, the second filler block 42, and the third filler block 43 can all be made of metal or composite materials. For example... Figure 14As shown, the molding hole 91 of the middle section shell 9 corresponding to the second filling block 42 is relatively large. Therefore, the volume of the second filling block 42 is also relatively large. In order to avoid the second filling block 42 being too heavy, a weight reduction groove 421 is formed on the side of the second filling block 42 away from the molding cavity, thereby reducing the weight of the second filling block 42.

[0027] Please refer to Figures 1 to 4 , Figures 12 to 14 In some embodiments provided in this application, the edge of the first filling block 41 is formed as a slope, which is inclined in a direction toward the molding cavity and away from the center of the first filling block 41; and / or, the edge of the second filling block 42 is formed as a slope, which is inclined in a direction toward the molding cavity and away from the center of the second filling block 42.

[0028] After the first mold 10 and the second mold 20 are removed from the formed middle section shell 9, the first filler block 41, the second filler block 42, and the third filler block 43 are still located in the forming hole 91 of the middle section shell 9. The first filler block 41 and the second filler block 42 need to be removed from the middle section shell 9 by moving them from top to bottom. Figure 3 (As shown in the orientation) the molding hole 91 is pulled out. Therefore, the edges of the first filling block 41 and the second filling block 42 are set as inclined surfaces. Compared with the edges set as vertical surfaces, the contact area between the edges and the hole wall of the molding hole 91 can be reduced, thereby making it easier to remove the first filling block 41 and the second filling block 42 from the molding hole 91.

[0029] Please refer to Figures 5 to 7 , Figure 9 and Figure 10 ,in, Figure 5 The display shows a sealing groove 50. Figure 6 This is a three-dimensional view of the first mold 10, the first reinforcing rib 70, the first front support rib 90, and the first rear support rib 100. Figure 7 The display shows the first half-slot 121. Figure 9 This is a perspective view of the second mold 20, the second reinforcing rib 80, the second front support rib 110, and the second rear support rib 120. Figure 10 The display shows a second half-slot 221.

[0030] In some embodiments provided in this application, the first mold 10 has a first connecting edge 12 protruding from its edge, and a first semi-groove 121 is formed on the first connecting edge 12. The second mold 20 has a second connecting edge 22 protruding from its edge and fitting to the first connecting edge 12, and a second semi-groove 221 is formed on the second connecting edge 22. The first semi-groove 121 and the second semi-groove 221 are joined to form a sealing groove 50. The helicopter mid-section shell forming mold also includes a sealing strip (not shown in the figure) disposed in the sealing groove 50.

[0031] The first mold 10 and the second mold 20 are connected by a first connecting edge 12 and a second connecting edge 22. The sides of the first connecting edge 12 and the second connecting edge 22 facing each other are both flat. The molding of the middle shell 9 requires the first mold 10 and the second mold 20 to be sealed at the connection. Therefore, a first half groove 121 is provided on the first connecting edge 12 and a second half groove 221 is provided on the second connecting edge 22. When the first connecting edge 12 and the second connecting edge 22 are in contact, a sealing groove 50 is formed. The sealing strip in the sealing groove 50 achieves a sealed connection between the first mold 10 and the second mold 20.

[0032] Specifically, the sealing strip and the sealing groove 50 are interference-fitted to achieve the best sealing effect. The sealing strip is fixed in the first half-groove 121 or the second half-groove 221, so that the sealing strip can be prevented from falling off when the first mold 10 and the second mold 20 are separated. Both the first half-groove 121 and the second half-groove 221 can be square grooves or semi-circular grooves, and the resulting sealing groove 50 can be a square groove or a cylindrical groove. The protruding length of the first connecting edge 12 and the second connecting edge 22 is 30mm~100mm.

[0033] Please continue reading. Figures 5 to 7 , Figure 9 and Figure 10 In some embodiments provided in this application, the first connecting edge 12 and the second connecting edge 22 are formed in a one-to-one correspondence, and each first connecting edge 12 and its corresponding second connecting edge 22 are spliced ​​together to form a sealing groove 50.

[0034] The shapes of the first mold 10 and the second mold 20 are designed according to the shape of the middle shell 9. Therefore, there are three first connecting edges 12 on the first mold 10 and three second connecting edges 22 on the second mold 20. Figure 6 As shown, both first connecting edges 12 are located on the upper part of the first mold 10, and the other first connecting edge 12 is located on the lower part of the first mold 10, as shown. Figure 9 As shown, both second connecting edges 22 are located on the upper part of the second mold 20, and the other second connecting edge 22 is located on the lower part of the second mold 20. A sealing strip is provided between each first connecting edge 12 and its corresponding second connecting edge 22.

[0035] Please refer to 6. Figure 7 , Figure 9 and Figure 10 ,in, Figure 7 The first connection hole 122 is shown. Figure 10 The display shows a second connection hole 222.

[0036] In some embodiments provided in this application, a first connecting hole 122 is also formed on the first connecting edge 12, and a second connecting hole 222 coaxial with the first connecting hole 122 is also formed on the second connecting edge 22. The first mold 10 and the second mold 20 are connected through the first connecting hole 122 and the second connecting hole 222.

[0037] Connectors are inserted into the first connecting hole 122 and the second connecting hole 222 to connect the first mold 10 and the second mold 20.

[0038] Specifically, the first connecting hole 122 and the second connecting hole 222 can be round holes, and the connecting element is a bolt passing through the first connecting hole 122 and the second connecting hole 222, and a nut for locking the bolt. The first connecting hole 122 and the second connecting hole 222 can also be threaded holes, and the connecting element is a screw threaded into the first connecting hole 122 and the second connecting hole 222. Each first connecting edge 12 has a plurality of first connecting holes 122 spaced apart, and each second connecting edge 22 has a plurality of second connecting holes 222 spaced apart, corresponding to the first connecting holes 122. A connecting element passes through each first connecting hole 122 and its corresponding second connecting hole 222 for fixation, thereby strengthening the connection stability of the first mold 10 and the second mold 20.

[0039] Please refer to Figure 6 , Figure 7 , Figure 9 and Figure 10 ,in, Figure 6 The display shows the first positioning slot 123. Figure 7 and Figure 9 The display shows a positioning component 60. Figure 10 The display shows a second positioning slot 223.

[0040] In some embodiments provided in this application, a first positioning groove 123 is also formed on the first connecting edge 12, and a second positioning groove 223 is also formed on the second connecting edge 22. The first positioning groove 123 and the second positioning groove 223 are spliced ​​together to form a positioning hole. The mid-section shell molding mold of the helicopter also includes a positioning element 60 disposed in the positioning hole.

[0041] The first mold 10 and the second mold 20 are two detachable components. Therefore, they need to be manufactured separately and then connected. To prevent the connection between the two from shifting, a first positioning groove 123, a second positioning groove 223, and positioning components 60 inside the two are provided. The first positioning groove 123 and the second positioning groove 223 are both cylindrical grooves with openings on one side. The openings of the two are opposite to each other. After the first positioning groove 123 and the second positioning groove 223 are spliced ​​together, a cylindrical positioning hole is formed, and the positioning hole is hidden.

[0042] Specifically, such as Figure 16As shown, the positioning component 60 includes a pin 61 and a sleeve 62 fitted onto the pin 61. The pin 61 can be fixed in one of the first positioning groove 123 and the second positioning groove 223, while the sleeve 62 is fixed in the other. During the connection process between the first mold 10 and the second mold 20, the pin 61 is aligned with the sleeve 62 until it is inserted into the sleeve 62, thereby achieving positioning and preventing misalignment of the connection between the first mold 10 and the second mold 20. The clearance between the pin 61 and the sleeve 62 is less than 0.1 mm, thus ensuring the mold closing accuracy of the first mold 10 and the second mold 20.

[0043] Please refer to Figure 8 and Figure 11 ,in, Figure 8 The first image is a perspective view of the first mold 10, and the 11th image is a perspective view of the second mold 20.

[0044] In some embodiments provided in this application, the helicopter mid-section shell molding mold further includes a first reinforcing rib 70 disposed on the side of the first mold 10 opposite to the molding cavity and a second reinforcing rib 80 disposed on the side of the second mold 20 opposite to the molding cavity.

[0045] The first reinforcing rib 70 is used to increase the strength of the first mold 10, and the second reinforcing rib 80 is used to increase the strength of the second mold 20, ensuring the stability of the middle shell 9 during the manufacturing process.

[0046] Please continue reading. Figure 8 and Figure 11 In some embodiments provided in this application, the first reinforcing rib 70 and / or the second reinforcing rib 80 are formed into a mesh structure.

[0047] The mesh structure has higher strength, which can maximize the strength of the first mold 10 and the second mold 20.

[0048] Specifically, the first reinforcing rib 70 protrudes from the first mold 10 by 8mm to 20mm and the second reinforcing rib 80 protrudes from the second mold 20 by 10mm to 100mm. The distance between the first reinforcing rib 70 and the second reinforcing rib 80 is 100mm to 300mm.

[0049] Please continue reading. Figure 8 and Figure 11In some embodiments provided in this application, the helicopter mid-section shell forming mold further includes a first front support rib 90 and a first rear support rib 100 disposed on the side of the first mold 10 away from the forming cavity, the two being spaced apart, and the end faces of the first front support rib 90 and the first rear support rib 100 being flush with the end faces of the first mold 10 away from the first mold 10, so as to support the first mold 10 to be placed horizontally; and / or, the helicopter mid-section shell forming mold further includes a second front support rib 110 and a second rear support rib 120 disposed on the side of the second mold 20 away from the forming cavity, the two being spaced apart, and the end faces of the second front support rib 110 and the second rear support rib 120 being flush with the end faces of the second mold 20 away from the second mold 20, so as to support the second mold 20 to be placed horizontally.

[0050] The end faces of the first front support rib 90 and the first rear support rib 100, which are opposite to the first mold 10, are flat and can simultaneously contact the same horizontal plane, allowing the first mold 10 to be stably placed on that horizontal plane and preventing it from wobbling, thus facilitating the manufacture of the first mold 10. Both the first front support rib 90 and the first rear support rib 100 are located on the same side of the first mold 10 as the first reinforcing rib 70. Due to the length of the first mold 10 (… Figure 8 The first mold 10 has a relatively long lateral dimension. The side of the first mold 10 where the first reinforcing rib 70 is provided has different degrees of protrusion in the direction away from the molding cavity at different positions in the length direction. Therefore, different support ribs are provided at positions with different degrees of protrusion. The first front support rib 90 is provided at the position with a smaller degree of protrusion and its extension length in the direction away from the first mold 10 is shorter. The first rear support rib 100 is provided at the position with a larger degree of protrusion and its extension length in the direction away from the first mold 10 is longer. This makes the end faces of the first front support rib 90 and the first rear support rib 100 flush with the end faces away from the first mold 10. In other words, the position and size of the first front support rib 90 and the first rear support rib 100 are used to adapt to the structure of the first mold 10.

[0051] Similarly, the end faces of the second front support rib 110 and the second rear support rib 120 facing away from the second mold 20 are flat, allowing them to simultaneously contact the same horizontal plane. This ensures the second mold 20 is stably placed on this horizontal plane, preventing it from wobbling and facilitating its fabrication. Both the second front support rib 110 and the second rear support rib 120 are located on the same side of the second mold 20 as the second reinforcing rib 80. Due to the length of the second mold 20 (… Figure 11The second mold 20 has a relatively long lateral dimension. The side of the second mold 20 where the second reinforcing rib 80 is set has different degrees of protrusion in the direction away from the molding cavity at different positions in the length direction. Therefore, different support ribs are set at positions with different degrees of protrusion. The second front support rib 110 is set at the position with a smaller degree of protrusion and its extension length in the direction away from the second mold 20 is shorter. The second rear support rib 120 is set at the position with a larger degree of protrusion and its extension length in the direction away from the second mold 20 is longer. This makes the end faces of the second front support rib 110 and the second rear support rib 120 flush with the end facing away from the second mold 20. In other words, the setting position and size of the second front support rib 110 and the second rear support rib 120 are used to adapt to the structure of the second mold 20.

[0052] Specifically, the first reinforcing rib 70, the first front support rib 90, and the first rear support rib 100 are integrally cast to increase their strength, and can be made of cast aluminum or cast iron; the second reinforcing rib 80, the second front support rib 110, and the second rear support rib 120 are integrally cast to increase their strength, and can be made of cast aluminum or cast iron.

[0053] In the description of this application, it should be understood that the terms “length”, “width”, “thickness”, “upper”, “lower”, “horizontal”, “inner”, “outer”, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not 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 application.

[0054] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0055] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between the components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0056] In this application, the term "some embodiments," etc., refers to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0057] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A molding die for forming the midsection shell of a helicopter, characterized in that, include: The first mold has the first set of grooves; A second mold is detachably and sealingly connected to the first mold, and the two form a molding cavity. The second mold has a second set of grooves, which are joined with the first set of grooves to form a molding groove set located within the molding cavity. A filling component is detachably connected within the molding groove assembly, the filling component being configured to be located within a molding hole of a middle section of the outer shell formed within the molding cavity.

2. The helicopter midsection shell forming mold according to claim 1, characterized in that, The molding groove group includes a first groove, a second groove, and a third groove. The first groove group includes a first recess, a second recess, and a third recess. The second groove group includes a fourth recess that is joined with the first recess to form the first groove, a fifth recess that is joined with the second recess to form the second groove, and a sixth recess that is joined with the third recess to form the third groove. The filling component includes a first filling block that is fitted into the first groove, a second filling block that is fitted into the second groove, and a third filling block that is fitted into the third groove.

3. The helicopter midsection shell forming mold according to claim 2, characterized in that, The edge of the first filler block is formed as a slope, which is inclined in a direction toward the molding cavity and away from the center of the first filler block; and / or, The edge of the second filler block is formed as a slope, which is inclined in a direction toward the molding cavity and away from the center of the second filler block.

4. The helicopter midsection shell forming mold according to claim 1, characterized in that, The first mold has a first connecting edge protruding from its side, and a first half-groove is formed on the first connecting edge. The second mold has a second connecting edge protruding from its side, which fits into the first connecting edge, and a second half-groove is formed on the second connecting edge. The first half-groove and the second half-groove are joined together to form a sealing groove. The helicopter mid-section shell forming mold also includes a sealing strip disposed in the sealing groove.

5. The helicopter midsection shell forming mold according to claim 4, characterized in that, The first connecting edge and the second connecting edge are formed in a one-to-one correspondence, and each first connecting edge and its corresponding second connecting edge are spliced ​​together to form a sealing groove.

6. The helicopter midsection shell forming mold according to claim 4, characterized in that, A first connecting hole is also formed on the first connecting edge, and a second connecting hole coaxial with the first connecting hole is also formed on the second connecting edge. The first mold and the second mold are connected through the first connecting hole and the second connecting hole.

7. The helicopter midsection shell forming mold according to claim 4, characterized in that, A first positioning groove is also formed on the first connecting edge, and a second positioning groove is also formed on the second connecting edge. The first positioning groove and the second positioning groove are spliced ​​together to form a positioning hole. The helicopter mid-section shell forming mold also includes a positioning component disposed in the positioning hole.

8. The helicopter midsection shell forming mold according to claim 1, characterized in that, The helicopter midsection shell forming mold also includes a first reinforcing rib disposed on the side of the first mold opposite to the forming cavity and a second reinforcing rib disposed on the side of the second mold opposite to the forming cavity.

9. The helicopter midsection shell forming mold according to claim 8, characterized in that, The first reinforcing rib and / or the second reinforcing rib are formed into a mesh structure.

10. The helicopter midsection shell forming mold according to claim 1, characterized in that, The helicopter midsection shell forming mold further includes a first front support rib and a first rear support rib disposed on the side of the first mold opposite to the forming cavity, spaced apart from each other. The end faces of the first front support rib and the first rear support rib opposite to the first mold are flush to support the first mold in a horizontal position; and / or, The helicopter mid-section shell forming mold also includes a second front support rib and a second rear support rib disposed on the side of the second mold opposite to the forming cavity. The two are spaced apart, and the end faces of the second front support rib and the second rear support rib opposite to the second mold are flush to support the second mold to be placed horizontally.

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