An rtm mold for molding a high speed helicopter tail propeller blade

Abstract

This invention discloses an RTM mold for molding the tail propeller blades of high-speed helicopters, comprising: a blade root module, an upper mold, and a lower mold; the blade root module includes: a left module, a right module, and a glue injection end cap; the left and right modules are assembled to form a blade root molding cavity; the glue injection end cap is fastened to the end of the blade root molding cavity; a shaped block extends from the side of the left module away from the right module, and a rocker arm cavity is provided in the inner cavity of the left module; the rocker arm cavity extends into the shaped block; an upper blade root mold cavity is provided at the position corresponding to the blade root module in the upper mold, and the side wall of the upper blade root mold cavity is provided with a mold closing surface, the mold closing surface having the same inclination direction as the side walls of the left and right modules, and contacting and pressing against each other; the upper and lower molds are fastened together, and a lower blade root mold cavity is provided at the position corresponding to the blade root module in the lower mold. The RTM mold of this invention facilitates mold closing and mold opening, and is suitable for blades with variable pitch rocker arm structures at the metal blade root.

Description

Technical Field

[0001] This invention relates to the field of propeller manufacturing equipment technology, and more specifically to an RTM mold for forming tail propeller blades of high-speed helicopters. Background Technology

[0002] Composite propeller blades are currently the mainstream of aircraft propeller development worldwide. Resin transfer molding (RTM) is a commonly used composite propeller blade molding process internationally. Currently, the metal root part of composite propeller blades is usually a rotating body, so there is no problem with angular positioning.

[0003] Existing metal propellers often feature variable-pitch rocker arm structures at their roots, resulting in significant structural changes to the entire propeller root area. Due to the irregular shape of the variable-pitch rocker arm, its position at the annular angle within the mold affects the entire mold-closing, mold-opening, and product removal process. Therefore, existing mold structures are no longer suitable.

[0004] Therefore, developing an RTM mold that is easy to assemble and assemble and is applicable to metal propeller roots with variable pitch rocker arm structures for molding the tail propeller blades of high-speed helicopters is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides an RTM mold for molding the tail propeller blades of high-speed helicopters, which is convenient for mold closing and mold opening, and is applicable to metal propeller roots with variable pitch rocker arm structures.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An RTM mold for molding tail propeller blades of high-speed helicopters, comprising:

[0008] The propeller root module includes a left module, a right module, and an injection end cap. The left and right modules are assembled to form a propeller root forming cavity. The injection end cap is fastened to the end of the propeller root forming cavity. A shaped block extends from the side of the left module away from the right module. A rocker arm cavity is provided in the inner cavity of the left module. The rocker arm cavity extends into the shaped block.

[0009] The upper mold has an upper propeller root mold cavity at the position corresponding to the propeller root module. The side wall of the upper propeller root mold cavity has a mold closing surface. The mold closing surface has the same inclination direction as the side walls of the left and right modules and is in contact with and squeezed against each other.

[0010] The lower mold is provided at the position corresponding to the propeller root module, and the upper mold and the lower mold are interlocked.

[0011] The beneficial effects of adopting the above technical solution are that, in this invention, a forming cavity for the propeller root rocker arm is reserved inside the left module, which can realize the processing of the propeller blade with the rocker arm; at the same time, if the left module and the right module are not in the mold closing position, the mold closing surface of the upper mold can directly contact and squeeze the side walls of the left module and the right module, so that the left module and the right module move towards the middle to close the mold, making the mold closing process convenient and easy to operate.

[0012] Preferably, the lower part of the rocker arm cavity is open, and the bottom end of the right module is provided with an extension block, which is engaged with the bottom of the rocker arm cavity.

[0013] Preferably, the rocker arm cavity is open on the side near the left module end face, and an insert is fastened to the open end of the rocker arm cavity side. Removing the insert allows for demolding of the rocker arm part, making the demolding process more convenient.

[0014] Preferably, the glue-injecting end cap has multiple glue-injecting channels radiating outward from the center, and each glue-injecting channel has a glue-injection port at its end, which is connected to the paddle root forming cavity. Multiple glue-injecting channels can increase the glue-injection speed.

[0015] Preferably, the injection port is conical in shape. The conical injection port allows the injection liquid to flow quickly into the molding cavity.

[0016] Preferably, the lower mold has an annular groove located outside the blade forming cavity, and a sealing ring is disposed within the annular groove. The sealing ring can seal the cavity after the upper and lower molds are engaged.

[0017] Preferably, the annular groove extends into multiple parallel intercepting grooves towards the blade forming cavity, and a sealing strip is provided within each intercepting groove. The intercepting grooves can form channels to intercept excess adhesive, ensuring that the adhesive flows only within the cavity and not onto the dividing surface, thus improving the adhesive injection effect.

[0018] Preferably, the lower mold is provided with guide posts, and the upper mold is provided with guide sleeves at corresponding positions to the guide posts, with the guide posts passing through the guide sleeves. The cooperation between the guide posts and guide sleeves allows for precise positioning of the upper and lower molds.

[0019] Preferably, lifting rings are provided on the side walls of both the upper and lower molds.

[0020] As can be seen from the above technical solution, compared with the prior art, the present invention discloses an RTM mold for molding the tail propeller blades of high-speed helicopters, the beneficial effects of which are:

[0021] (1) In this invention, by setting a rocker arm cavity in the left module, the blade with rocker arm can be formed and processed;

[0022] (2) A mold closing surface is set in the upper mold so that the mold closing surface contacts and presses against the side walls of the left and right modules, so that the left and right modules close and realize the mold closing process; similarly, when opening the mold, the rocker arm can be taken out by removing the insert. The mold opening and closing process is simple and convenient to operate. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 A schematic diagram of the mold provided by the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the upper mold provided by the present invention;

[0026] Figure 3 This is a schematic diagram of the lower mold structure provided by the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of the propeller root module provided by the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of one side of the glue injection end cap of the propeller root module provided by the present invention.

[0029] In the figure,

[0030] 1-Paddle Root Module;

[0031] 11 - Left module; 12 - Right module;

[0032] 13-Glue-filled end cap;

[0033] 131 - Glue channel; 132 - Glue inlet;

[0034] 14-Irregularly shaped block; 15-Rocker arm cavity; 16-Extension block; 17-Inlay;

[0035] 2-upper mold;

[0036] 21-Upper mold cavity; 22-Matching surface;

[0037] 3-Lower mold;

[0038] 31-Guide post; 32-Annular groove; 33-Cutoff groove;

[0039] 4-Hanging rings. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] like Figure 1-5 As shown, an embodiment of the present invention discloses an RTM mold for molding the tail propeller blades of a high-speed helicopter, comprising:

[0042] The propeller root module 1 includes a left module 11, a right module 12, and an injection end cap 13. The left module 11 and the right module 12 are assembled to form a propeller root forming cavity. The injection end cap 13 is fastened to the end of the propeller root forming cavity. A shaped block 14 extends from the side of the left module 11 away from the right module 12. A rocker arm cavity 15 is provided in the inner cavity of the left module 11. The rocker arm cavity 15 extends into the shaped block 14.

[0043] Upper mold 2, upper mold 2 is provided with upper propeller root cavity 21 at the position corresponding to propeller root module 1, and the side wall of upper propeller root cavity 21 is provided with mold closing surface 22. The mold closing surface 22 is inclined in the same direction as the side wall of left module 11 and right module 12, and they are in contact and pressed against each other.

[0044] The lower mold 3, upper mold 2, and lower mold 3 interlock. The lower mold 3 has a lower propeller root cavity corresponding to the position of the propeller root module 1. The upper parts of the left module 11 and the right module 12 are each a quarter-hexagonal prism structure, and the upper propeller root cavity 21 is a half-hexagonal prism structure. When the upper mold 2 is engaged, the mating surface 22 of the upper mold 2 compresses the left module 11 and the right module 12 towards the middle to close the mold. The cylindrical cavity at the joint position of the left module 11 and the right module 12 is the propeller root forming cavity.

[0045] To further optimize the above technical solution, the bottom of the rocker arm cavity 15 is open, and the bottom of the right module 12 is provided with an extension block 16, which is engaged with the bottom of the rocker arm cavity 15.

[0046] To further optimize the above technical solution, the rocker arm cavity 15 is open on the side near the end face of the left module 11, and the open end of the rocker arm cavity 15 is fitted with an insert 17.

[0047] To further optimize the above technical solution, the glue injection end cap 13 is provided with multiple glue injection channels 131 radially outward from the center, and the glue injection port 132 is provided at the end of the glue injection channel 131, which is connected to the paddle root forming cavity. Figure 5 There are four injection channels 131 and four injection ports 132.

[0048] To further optimize the above technical solution, the injection port 132 is conical in shape. The diameter of the injection port 132 gradually increases from the outside to the inside of the paddle root forming cavity.

[0049] To further optimize the above technical solution, the lower mold 3 is provided with an annular groove 32 located outside the blade forming cavity, and a sealing ring is provided inside the annular groove 32. The annular groove 32 has two rings, and the sealing ring also has two rings, resulting in a better sealing effect.

[0050] To further optimize the above technical solution, multiple parallel intercepting grooves 33 extend from the annular groove 32 toward the blade forming cavity, and sealing strips are provided inside the intercepting grooves 33. The intercepting grooves 33 are connected to the annular groove 32 of the inner ring.

[0051] To further optimize the above technical solution, the lower mold 3 is provided with a guide post 31, and the upper mold 2 is provided with a guide sleeve at the corresponding position of the guide post 31, with the guide post 31 passing through the inside of the guide sleeve.

[0052] To further optimize the above technical solution, lifting rings 4 are provided on the side walls of both the upper mold 2 and the lower mold 3.

[0053] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0054] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An RTM mold for molding tail propeller blades of high-speed helicopters, characterized in that, include: The propeller root module (1) includes a left module (11), a right module (12), and an injection end cap (13). The left module (11) and the right module (12) are assembled to form a propeller root forming cavity. The injection end cap (13) is fastened to the end of the propeller root forming cavity. A shaped block (14) extends from the side of the left module (11) away from the right module (12). A rocker arm cavity (15) is provided in the inner cavity of the left module (11). The rocker arm cavity (15) extends into the shaped block (14). The upper mold (2) is provided with an upper paddle root mold cavity (21) at the position corresponding to the paddle root module (1). The side wall of the upper paddle root mold cavity (21) is provided with a mold closing surface (22). The mold closing surface (22) is inclined in the same direction as the side wall of the left module (11) and the right module (12), and they are in contact and squeezed against each other. The lower mold (3) is interlocked with the upper mold (2) and the lower mold (3). The lower mold (3) is provided with a lower propeller root cavity at the position corresponding to the propeller root module (1).

2. The RTM mold for molding the tail propeller blades of a high-speed helicopter according to claim 1, characterized in that, The lower part of the rocker arm cavity (15) is open, and the bottom end of the right module (12) is provided with an extension block (16), which is engaged with the bottom of the rocker arm cavity (15).

3. The RTM mold for molding the tail propeller blades of a high-speed helicopter according to claim 2, characterized in that, The rocker arm cavity (15) is open on the side near the end face of the left module (11), and a block (17) is fastened to the open end of the side of the rocker arm cavity (15).

4. The RTM mold for molding the tail propeller blades of a high-speed helicopter according to claim 1, characterized in that, The glue injection end cap (13) has multiple glue injection channels (131) arranged radially from the center outwards. The glue injection channel (131) has a glue injection port (132) at the end, and the glue injection port (132) is connected to the paddle root forming cavity.

5. An RTM mold for molding tail propeller blades of a high-speed helicopter according to claim 4, characterized in that, The injection port (132) is conical in shape.

6. An RTM mold for molding tail propeller blades of a high-speed helicopter according to claim 1, characterized in that, The lower mold (3) is provided with an annular groove (32) located outside the blade forming cavity, and a sealing ring is provided in the annular groove (32).

7. An RTM mold for molding tail propeller blades of a high-speed helicopter according to claim 6, characterized in that, The annular groove (32) extends into multiple parallel intercepting grooves (33) in the direction of the blade forming cavity, and a sealing strip is provided in the intercepting groove (33).

8. An RTM mold for molding tail propeller blades of a high-speed helicopter according to claim 1, characterized in that, The lower mold (3) is provided with a guide post (31), and the upper mold (2) is provided with a guide sleeve at the corresponding position of the guide post (31). The guide post (31) passes through the inside of the guide sleeve.

9. An RTM mold for molding tail propeller blades of a high-speed helicopter according to claim 1, characterized in that, Both the upper mold (2) and the lower mold (3) are provided with lifting rings (4) on their side walls.

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