RTM (Resin Transfer Molding) mold for molding propelling blade at tail part of high-speed helicopter

Abstract

The invention discloses an RTM (Resin Transfer Molding) mold for molding a high-speed helicopter tail propeller blade. The RTM mold comprises a propeller root module, an upper mold and a lower mold, the paddle root module comprises a left module, a right module and a glue injection end cover; the left module and the right module are spliced to form a paddle root forming cavity; the glue injection end cover is buckled at the tail end of the paddle root forming cavity; a special-shaped block extends out of the side, away from the right module, of the left module. A rocker arm cavity is formed in an inner cavity of the left module. The rocker arm cavity extends into the special-shaped block; an upper paddle root mold cavity is formed in the position, corresponding to the paddle root module, of the upper mold, a mold closing surface is arranged on the side wall of the upper paddle root mold cavity, and the mold closing surface is the same as the side walls of the left module and the right module in inclination direction and is in contact and extrusion with the left module and the right module; the upper die and the lower die are buckled with each other, and a lower paddle root die cavity is formed in the position, corresponding to the paddle root die block, of the lower die. The RTM mold is convenient to assemble and disassemble, and is suitable for a paddle with a variable pitch rocker arm structure at the root of a metal paddle.

Description

Technical Field

[0001] The invention relates to the technical field of blade production equipment, and more particularly to an RTM mold for molding a high-speed helicopter tail propulsion blade. Background Art

[0002] Composite propeller blades are the mainstream of the current development of aircraft propellers in the world. Resin transfer molding (RTM) is the most common composite blade molding process internationally. Currently, the metal root part of composite propeller blades is usually a rotating body, and there is no problem of angular positioning.

[0003] However, some existing metal propellers have a variable pitch rocker structure at the root, which will cause a huge structural change in the entire metal propeller root. Due to the irregular shape of the variable pitch rocker, the annular angular position in the mold affects the entire mold closing, mold separation and product removal process. Therefore, the existing mold structure is no longer applicable.

[0004] Therefore, it is an urgent problem for technical personnel in this field to develop an RTM mold that is convenient for mold closing and mold separation and suitable for forming high-speed helicopter tail propulsion blades with a variable pitch rocker arm structure at the root of the metal propeller. Summary of the invention

[0005] In view of this, the present invention provides an RTM mold for molding a high-speed helicopter tail propulsion blade, which is convenient for mold closing and mold separation and is suitable for a metal propeller root with a variable pitch rocker arm structure.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] An RTM mold for molding a high-speed helicopter tail propulsion blade, comprising:

[0008] A blade root module, the blade root module comprising: a left module, a right module and a glue injection end cover; the left module and the right module are assembled to form a blade root forming cavity; the glue injection end cover is buckled at the end of the blade root forming cavity; a special-shaped block is extended from a side of the left module away from the right module, and a rocker cavity is provided in the inner cavity of the left module; the rocker cavity extends into the special-shaped block;

[0009] An upper mold, wherein an upper blade root mold cavity is provided at a position of the upper mold corresponding to the blade root module, and a mating surface is provided on a side wall of the upper blade root mold cavity, wherein the mating surface has the same inclination direction as the side walls of the left module and the right module, and contacts and extrude with each other;

[0010] The upper mold and the lower mold are buckled with each other, and a lower propeller root mold cavity is provided at a position of the lower mold corresponding to the propeller root module.

[0011] The beneficial effect of adopting the above technical solution is that in the present invention, a molding cavity for the propeller root rocker arm is reserved inside the left module, so that the blade with the rocker arm can be processed; at the same time, the left module and the right module are not molded in place, and the mold surface of the upper mold can directly contact and extrude the side walls of the left module and the right module, so that the left module and the right module move to the middle to close the mold, making the mold closing process convenient and easy to operate.

[0012] Preferably, the bottom of the rocker arm cavity is open, and an extension block is provided at the bottom end of the right module, and the extension block is buckled with the bottom of the rocker arm cavity.

[0013] Preferably, the side of the rocker arm cavity close to the left module end face is open, and an insert is buckled on the open end of the side of the rocker arm cavity. By removing the insert, the rocker arm part can be demoulded, and the demoulding process is more convenient.

[0014] Preferably, the glue injection end cover is provided with a plurality of glue injection channels radially from the center to the outside, and a glue injection port is provided at the end of the glue injection channel, and the glue injection port is connected to the blade root molding cavity. Multiple glue injection channels can increase the glue injection speed.

[0015] Preferably, the glue injection port is in a cone shape, so that the glue injection liquid can flow into the molding cavity quickly.

[0016] Preferably, the lower mold is provided with an annular groove at a position outside the blade molding cavity, and a sealing ring is arranged in the annular groove. The sealing ring can seal the cavity after the upper mold and the lower mold are buckled.

[0017] Preferably, the annular groove extends a plurality of parallel intercepting grooves toward the blade molding cavity, and a sealing strip is arranged in the intercepting groove. A glue flow intercepting channel can be formed between the intercepting grooves, so that the injection glue only flows in the cavity and does not flow on the dividing surface, thereby improving the injection effect.

[0018] Preferably, the lower die is provided with a guide post, and the upper die is provided with a guide sleeve at a position corresponding to the guide post, and the guide post is inserted into the guide sleeve. The cooperation of the guide post and the guide sleeve can enable the upper die and the lower die to be precisely positioned.

[0019] Preferably, the side walls of the upper die and the lower die are both provided with hanging rings.

[0020] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a RTM mold for molding a high-speed helicopter tail propulsion blade, which has the following beneficial effects:

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

[0022] (2) A mold closing surface is arranged in the upper mold so that the mold closing surface contacts and squeezes the side walls of the left and right modules, so that the left and right modules are closed and the mold closing process is realized; similarly, when opening the mold, the rocker arm can be taken out by removing the insert, and the mold opening and closing process is simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

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

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

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

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

[0028] Figure 5 A schematic diagram of the structure of one side of the glue-injected end cover of the propeller root module provided by the present invention.

[0029] Among them, in the figure,

[0030] 1- propeller root module;

[0031] 11-left module; 12-right module;

[0032] 13- glue injection end cap;

[0033] 131-glue injection channel; 132-glue injection port;

[0034] 14-special-shaped block; 15-rocker arm cavity; 16-extension block; 17-insert block;

[0035] 2-upper mold;

[0036] 21-upper blade root cavity; 22-mold surface;

[0037] 3-lower die;

[0038] 31-guide column; 32-annular groove; 33-cut-off groove;

[0039] 4- Rings. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

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

[0042] The blade root module 1 includes: a left module 11, a right module 12 and a glue injection end cover 13; the left module 11 and the right module 12 are assembled to form a blade root molding cavity; the glue injection end cover 13 is buckled at the end of the blade root molding cavity; a special-shaped block 14 is extended from the side of the left module 11 away from the right module 12, and a rocker cavity 15 is provided in the inner cavity of the left module 11; the rocker cavity 15 extends into the special-shaped block 14;

[0043] An upper mold 2 is provided with an upper blade root mold cavity 21 at a position corresponding to the blade root module 1, and a side wall of the upper blade root mold cavity 21 is provided with a mating surface 22, and the mating surface 22 has the same inclination direction as the side walls of the left module 11 and the right module 12, and they are in contact and extruded with each other;

[0044] The lower mold 3, the upper mold 2 and the lower mold 3 are buckled with each other, and the lower mold 3 is provided with a lower propeller root mold cavity at the position corresponding to the propeller root module 1. The upper parts of the left module 11 and the right module 12 are respectively one-quarter hexagonal prism structures, and the upper propeller root mold cavity 21 is one-half hexagonal prism structure. When the upper mold 2 is buckled, the mold surface 22 of the upper mold 2 squeezes the left module 11 and the right module 12 to gather and close the mold in the middle. The cylindrical cavity at the joint position of the left module 11 and the right module 12 is the propeller root molding cavity.

[0045] In order to further optimize the above technical solution, the bottom of the rocker arm cavity 15 is open, and an extension block 16 is provided at the bottom end of the right module 12 , and the extension block 16 is buckled with the bottom of the rocker arm cavity 15 .

[0046] In order to further optimize the above technical solution, the side of the rocker cavity 15 close to the end face of the left module 11 is open, and an insert 17 is buckled on the open end of the side of the rocker cavity 15.

[0047] In order to further optimize the above technical solution, the glue injection end cover 13 is provided with a plurality of glue injection channels 131 radially from the center to the outside, and a glue injection port 132 is provided at the end of the glue injection channel 131, and the glue injection port 132 is connected to the blade root molding cavity. Figure 5 There are four middle glue injection channels 131 and four glue injection ports 132 .

[0048] In order to further optimize the above technical solution, the glue injection port 132 is in a cone shape. The diameter of the glue injection port 132 gradually increases from the outside to the inside of the blade root molding cavity.

[0049] In order to further optimize the above technical solution, the lower mold 3 is provided with an annular groove 32 at a position outside the blade forming cavity, and a sealing ring is provided in the annular groove 32. The annular groove 32 is provided with two circles, and the sealing ring is also provided with two circles, so that the sealing effect is better.

[0050] In order to further optimize the above technical solution, the annular groove 32 extends a plurality of parallel intercepting grooves 33 in the direction of the blade forming cavity, and a sealing strip is arranged in the intercepting groove 33. The intercepting groove 33 is connected to the annular groove 32 of the inner ring.

[0051] In order 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 a position corresponding to the guide post 31, and the guide post 31 is inserted into the guide sleeve.

[0052] In order to further optimize the above technical solution, hanging rings 4 are provided on the side walls of the upper mold 2 and the lower mold 3 .

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

[0054] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one 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 present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An RTM mold for molding a high-speed helicopter tail propulsion blade, characterized in that: include: A blade root module (1), the blade root module (1) comprising: a left module (11), a right module (12) and a glue injection end cover (13); the left module (11) and the right module (12) are assembled to form a blade root molding cavity; the glue injection end cover (13) is buckled at the end of the blade root molding cavity; a special-shaped block (14) extends from a side of the left module (11) away from the right module (12), and a rocker cavity (15) is provided in the inner cavity of the left module (11); the rocker cavity (15) extends into the special-shaped block (14); An upper mold (2), wherein an upper blade root mold cavity (21) is provided at a position of the upper mold (2) corresponding to the blade root module (1), and a mating surface (22) is provided on a side wall of the upper blade root mold cavity (21), and the mating surface (22) has the same inclination direction as the side walls of the left module (11) and the right module (12), and they are in contact and extrusion with each other; The upper mold (2) and the lower mold (3) are buckled with each other, and a lower propeller root mold cavity is provided at a position of the lower mold (3) corresponding to the propeller root module (1).

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

3. The RTM mold for molding high-speed helicopter tail propulsion blades according to claim 2, characterized in that: The side of the rocker arm cavity (15) close to the end surface of the left module (11) is open, and an insert (17) is buckled on the open end of the side surface of the rocker arm cavity (15).

4. The RTM mold for molding a high-speed helicopter tail propulsion blade according to claim 1, characterized in that: The glue injection end cover (13) is provided with a plurality of glue injection channels (131) radially from the center to the outside, and a glue injection port (132) is provided at the end of the glue injection channel (131), and the glue injection port (132) is communicated with the blade root molding cavity.

5. The RTM mold for molding a high-speed helicopter tail propulsion blade according to claim 4, characterized in that: The glue injection port (132) is in a cone shape.

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

7. The RTM mold for molding a high-speed helicopter tail propulsion blade according to claim 6, characterized in that: The annular groove (32) extends in the direction of the blade forming cavity to form a plurality of intercepting grooves (33) arranged in parallel, and a sealing strip is arranged in the intercepting groove (33).

8. The RTM mold for molding a high-speed helicopter tail propulsion blade according to claim 1, characterized in that: The lower die (3) is provided with a guide post (31), and the upper die (2) is provided with a guide sleeve at a position corresponding to the guide post (31), and the guide post (31) is inserted into the guide sleeve.

9. The RTM mold for molding a high-speed helicopter tail propulsion blade according to claim 1, characterized in that: The side walls of the upper mold (2) and the lower mold (3) are both provided with hanging rings (4).

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