CN220390384U

CN220390384U - Forming die and paving tool for tail inclined beam wallboard of helicopter

Info

Publication number: CN220390384U
Application number: CN202322138144.0U
Authority: CN
Inventors: 张晨乾; 叶宏军; 翟全胜; 包建文
Original assignee: AVIC Beijing Aeronautical Manufacturing Technology Research Institute
Current assignee: AVIC Beijing Aeronautical Manufacturing Technology Research Institute
Priority date: 2023-08-09
Filing date: 2023-08-09
Publication date: 2024-01-26
Anticipated expiration: 2033-08-09

Abstract

The utility model provides a forming die and a paving tool for a helicopter tail oblique beam wallboard, wherein the forming die comprises a first U-shaped forming die, a second U-shaped forming die and a carbon fiber monofilament block; a plurality of first U-shaped forming dies provided with first forming cavities for placing skins are arranged in parallel along the length direction of the first U-shaped forming dies and are detachably connected and fixed in sequence; a plurality of second U-shaped forming dies provided with second forming cavities for placing skins are arranged in parallel along the length direction of the second U-shaped forming dies and are detachably connected and fixed in sequence; the first U-shaped forming die is fixedly connected above the second U-shaped forming die, so that an opening of the first forming die and an opening of the second forming die are oppositely arranged to form an I-shaped structure, and an R region is formed between the first U-shaped forming die and the second U-shaped forming die; the shape of the carbon fiber monofilament block is matched with the shape of the R area, and the R area is filled with the carbon fiber monofilament block. Compared with the prior art, the utility model has the advantages of lower production cost, easy transportation and higher utilization rate in the life cycle.

Description

Forming die and paving tool for tail inclined beam wallboard of helicopter

Technical Field

The utility model relates to the technical field of forming tools, in particular to a forming die and a paving tool for a tail oblique beam wallboard of a helicopter.

Background

The front beam and the back beam of the tail inclined beam of the helicopter are typical complex profile variable thickness composite material I-shaped beam structural members, and the size is usually more than 3 m. In the molding process, the mold needs to be turned over and positioned for assembly, and the size of the part is long, if a metal molding mold is adopted, the weight of the mold is usually more than 100KG under the condition of ensuring the precision, and the mold is difficult to operate manually. Therefore, the use of a composite molding die is an alternative. Existing forming tools generally include a composite forming die and a metal frame for supporting the composite forming die. At present, the prior art has the following technical problems:

1. the existing composite material forming die is only limited to be used for tail inclined beam wallboards of a certain specific model, and when the digital die of the tail inclined beam wallboards is changed, the original composite material forming die cannot be used, and a new composite material forming die needs to be manufactured again. This creates two costs: the storage cost of the original forming die and the manufacturing cost of the new forming die.

2. The composite material forming die is inconvenient to maintain deformation when bearing the pressure of at most 0.7MPa at 200 ℃, and the conventional composite material forming die is large in size (usually 3-4 m in length), so that the rigidity of the composite material forming die is ensured, the thickness of the composite material forming die is usually about 15mm, and meanwhile, thicker reinforcing ribs are required to be locally added to ensure the rigidity of the die, so that the composite material is large in material consumption and high in cost. Therefore, the weight of the composite material forming die is more than 13KG, and the die cost and the operation difficulty are greatly increased.

3. The existing composite material forming die needs to integrally feed the forming tool into the tank when feeding the tank, because the height of the metal frame of the forming tool is between (700-800) mm, the diameter is 1.5m, the autoclave with the length of 3m can only feed a group of wall plates, and during batch production, the integral metal platform is large in size and can influence the tank feeding efficiency, and meanwhile, the metal frame used for paving operation needs to enter and exit the tank for many times along with a test piece, and the paving operation cannot be carried out by utilizing the platform when feeding the tank, so that the paving efficiency is influenced. Moreover, when scratches appear on the surface of the composite material forming die, the surface cannot be repaired, the local edge area of the material can be scratched due to repeated trimming, and when the local part of the composite material forming die is collided to generate layering, the composite material forming die can only be scrapped integrally, so that great waste and environmental pollution are caused.

Disclosure of Invention

First, the technical problem to be solved

The technical problem to be solved by the utility model is that the existing helicopter tail oblique beam wallboard forming tool has the defects of high production cost, difficult transportation and low utilization rate in the life cycle of the forming tool in use.

(II) technical scheme

In order to achieve the above purpose, the utility model adopts the following technical scheme:

in a first aspect, a molding die for a helicopter tail oblique beam wallboard is provided, and comprises a first U-shaped molding die, a second U-shaped molding die and a carbon fiber monofilament block; the first U-shaped forming dies are arranged in parallel along the length direction of the first U-shaped forming dies and are sequentially detachably connected and fixed, and the first U-shaped forming dies are provided with first forming cavities for placing skins; the second U-shaped forming dies are arranged in parallel along the length direction of the second U-shaped forming dies and are sequentially detachably connected and fixed, and the second U-shaped forming dies are provided with second forming cavities for placing skins; the first U-shaped forming dies and the second U-shaped forming dies are placed in one-to-one correspondence, the first U-shaped forming dies are fixedly connected above the second U-shaped forming dies, so that an opening of the first forming die cavity and an opening of the second forming die cavity are oppositely arranged to form an I-shaped structure, and an R region is formed between the first U-shaped forming dies and the second U-shaped forming dies; the shape of the carbon fiber monofilament block is matched with the shape of the R region, and the R region is filled with the carbon fiber monofilament block.

Preferably, two adjacent first U-shaped forming dies are connected in a positioning way through positioning pins, and two adjacent second U-shaped forming dies are connected in a positioning way through another positioning pin.

Preferably, two adjacent first U-shaped forming dies are connected through bolt fastening, and two adjacent second U-shaped forming dies are connected through another bolt fastening.

Preferably, the first U-shaped forming die is provided with a first positioning pin hole, the length direction of the first positioning pin hole is perpendicular to the bottom surface of the first forming die, the second U-shaped forming die is provided with a second positioning pin hole, and the length direction of the second positioning pin hole is perpendicular to the bottom surface of the second forming die.

Preferably, a first arc angle is arranged on the side surface, facing away from the first forming cavity, of the first U-shaped forming die, a second arc angle is arranged on the side surface, facing away from the second forming cavity, of the second U-shaped forming die, and an R region is formed between the first arc angle and the second arc angle.

Preferably, the fit clearance between two adjacent first U-shaped forming dies is not more than 0.05mm, and the fit clearance between two adjacent second U-shaped forming dies is not more than 0.05mm.

Preferably, the surfaces of the first molding cavity and the second molding cavity are covered with a peelable release cloth.

Preferably, the thickness of the first U-shaped forming die and the second U-shaped forming die is 7mm.

In a second aspect, a tooling for paving a tail oblique beam wallboard of a helicopter is provided, the tooling for paving comprises a support, a first clamping piece and a second clamping piece, the support is provided with a mounting groove, the mounting groove is provided with a first side and a second side which are oppositely arranged, the first side is provided with an adjustable first clamping piece, the second side is provided with an adjustable second clamping piece, and the first clamping piece and the second clamping piece can clamp and fix any one of the molding dies of the tail oblique beam wallboard of the helicopter in the technical scheme.

Preferably, the first clamping piece comprises a blocking strip, a screw rod and a knob, one end of the screw rod is connected with the knob, the other end of the screw rod is connected with the blocking strip, and the screw rod is in threaded connection with the first side.

(III) beneficial effects

The technical scheme of the utility model has at least the following advantages:

1. the utility model provides a molding die for a helicopter tail oblique beam wallboard, which is formed by detachably connecting a plurality of first U-shaped molding dies and a plurality of second U-shaped molding dies. The first U-shaped forming dies and the second U-shaped forming dies with corresponding numbers can be selected according to the size of the helicopter tail oblique beam wall plate to be formed, and the first U-shaped forming dies and the second U-shaped forming dies are assembled. Compared with the integral die, the first U-shaped forming die and the second U-shaped forming die are smaller in size, the requirement on storage space is remarkably reduced, the support is not required to be carried together with the forming die, the weight of a single carrying assembly is greatly reduced, and the logistics cost is reduced.

2. Compared with an integral die, the die is formed by assembling a plurality of first U-shaped forming dies and second U-shaped forming dies, the size of the single die is reduced, and the smaller size die is not easy to deform relative to the larger size die, so that the number and the size of the reinforcing ribs can be reduced to strengthen the structure, the overall quality of the die is reduced, the manufacturing cost is reduced, and the operation difficulty is reduced.

3. The first U-shaped forming die and the second U-shaped forming die are detachably connected, and compared with an integral die, the forming die for the helicopter tail oblique beam wallboard can reduce the overall height of the die and is convenient to transport into a tank. The utility model has lighter weight, does not need to use lifting equipment such as fork trucks, cranes and the like for carrying, and reduces the facility requirement on production sites and the transfer efficiency. The support is only required to be placed in a paving room for fixing, so that the paving precision of the tail inclined beam wallboard of the helicopter can be ensured under the condition of reducing the structural weight. The service life of the support is greatly prolonged.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a helicopter tail oblique beam wallboard forming tool provided by an embodiment of the utility model.

Fig. 2 is a schematic structural diagram of a paving tool for a tail oblique beam wallboard of a helicopter provided by an embodiment of the utility model.

Fig. 3 is a partial block diagram of a helicopter tail oblique beam wallboard forming tool provided by an embodiment of the present utility model.

The reference numerals in the drawings are as follows:

100. shaping tooling of a helicopter tail oblique beam wallboard; 200. paving tool for tail oblique beam wallboard of helicopter;

1. a first U-shaped forming die; 2. a second U-shaped forming die; 3. positioning the mounting hole; 4. bolt holes; 5. a support; 6. a target hole; 7. a first clamping member; 8. a second clamping member; 10. an R region;

11. a first molding cavity; 12. a first arc angle; 21. a second molding cavity; 22. a second arc angle; 51. a mounting groove; 71. a barrier strip; 72. a screw; 73. a knob; 101. carbon fiber monofilament block; 102. a carbon fiber interlayer; 103. air rubber soft mold; 104. carbon fiber ear pieces; 511. a first side; 512. a second side.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected" to another element, it can be directly connected or indirectly connected to the other element.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing the utility model based on the orientation or positional relationship shown in the drawings, and are not to be construed as limiting the utility model, as the indicating device or element must have a particular orientation, be constructed and operated in a particular orientation.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating relative importance or indicating the number of technical features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. The following describes in more detail the specific implementation of the present utility model in connection with specific embodiments:

as shown in fig. 1 and 3, an embodiment of the present utility model provides a molding die 100 for a helicopter tail oblique beam wallboard, which includes a first U-shaped molding die 1, a second U-shaped molding die 2, and a carbon fiber monofilament block 101; the first U-shaped forming dies 1 are arranged in parallel along the length direction of the first U-shaped forming dies 1 and are sequentially detachably connected and fixed, and the first U-shaped forming dies 1 are provided with first forming cavities 11 for placing skins; a plurality of second U-shaped forming dies 2 are arranged in parallel along the length direction and are sequentially detachably connected and fixed, and the second U-shaped forming dies 2 are provided with second forming cavities 21 for placing skins; the first U-shaped forming dies 1 and the second U-shaped forming dies 2 are placed in one-to-one correspondence, the first U-shaped forming dies 1 are fixedly connected above the second U-shaped forming dies 2, so that the openings of the first forming cavities 11 and the openings of the second forming cavities 21 are oppositely arranged to form an I-shaped structure, and an R region 10 is formed between the first U-shaped forming dies 1 and the second U-shaped forming dies 2; the shape of the carbon fiber filament block 101 is adapted to the shape of the R region 10, and fills the R region 10.

As an alternative implementation manner of this embodiment, two adjacent first U-shaped forming dies 1 are connected in a positioning manner by a positioning pin (not shown), and two adjacent second U-shaped forming dies 2 are connected in a positioning manner by another positioning pin. Specifically, the first U-shaped forming die 1 (or the second U-shaped forming die 2) is provided with a positioning mounting hole 3, and two ends of the positioning pin can be respectively penetrated in the positioning mounting holes 3 corresponding to two adjacent first U-shaped forming dies 1 (or the second U-shaped forming die 2), so that quick positioning mounting between the two first U-shaped forming dies 1 (or the second U-shaped forming die 2) is realized.

As an alternative implementation manner of this embodiment, two adjacent first U-shaped forming dies 1 are fastened and connected by bolts (not shown), and two adjacent second U-shaped forming dies 2 are fastened and connected by another bolt. Specifically, bolt holes 4 are formed in the first U-shaped forming die 1 (or the second U-shaped forming die 2), and bolts can sequentially penetrate through the two adjacent bolt holes 4 corresponding to the first U-shaped forming die 1 (or the second U-shaped forming die 2), so that quick fixing between the two first U-shaped forming dies 1 (or the second U-shaped forming die 2) is realized.

As an alternative implementation manner of this embodiment, the first U-shaped forming die 1 is provided with a first positioning pin hole 91, the length direction of the first positioning pin hole 91 is perpendicular to the bottom surface of the first forming cavity 11, and the second U-shaped forming die 2 is provided with a second positioning pin hole 92, and the length direction of the second positioning pin hole 92 is perpendicular to the bottom surface of the second forming cavity 21.

As an alternative implementation manner of this embodiment, a side surface of the first U-shaped forming die 1 facing away from the first forming die 11 is provided with a first circular arc angle 12, a side surface of the second U-shaped forming die 2 facing away from the second forming die 21 is provided with a second circular arc angle 22, and an R region 10 is formed between the first circular arc angle 12 and the second circular arc angle 22.

As an alternative implementation manner of this embodiment, the fit clearance between two adjacent first U-shaped forming dies 1 is not greater than 0.05mm, and the fit clearance between two adjacent second U-shaped forming dies 2 is not greater than 0.05mm.

As an alternative to this embodiment, the surfaces of the first molding cavity 11 and the second molding cavity 21 are covered with a peelable release cloth. In this embodiment, the releasable release cloth is preferably a one-sided releasable release cloth of a005 polytetrafluoroethylene.

As an alternative implementation of this embodiment, the thickness of the first U-shaped forming die 1 and the second U-shaped forming die 2 is 7mm. The existing composite material forming die is generally 3-4 meters long. The first U-shaped forming die 1 and the second U-shaped forming die 2 provided in this embodiment may be designed to be 1 meter long, and then combined to form the forming die 100 of the helicopter tail diagonal wallboard having a length of 3-4 meters. The calculation and analysis show that under the condition of ensuring the laying rigidity, the thickness of the molding die 100 of the helicopter tail oblique beam wallboard can be reduced to 7mm, and compared with the existing composite material molding die, the weight is reduced by at least more than half, so that the transportation of the molding die 100 of the helicopter tail oblique beam wallboard is easier, and the process of turning the die is simpler.

As shown in fig. 2, the embodiment of the utility model further provides a paving tool 200 for a helicopter tail boom wallboard, where the paving tool 200 includes a support 5, a first clamping member 7 and a second clamping member 8, the support 5 is provided with a mounting groove 51, the mounting groove 51 has a first side 511 and a second side 512 that are oppositely disposed, the first side 511 is provided with an adjustable first clamping member 7, the second side 512 is provided with an adjustable second clamping member 8, and the first clamping member 7 and the second clamping member 8 can clamp and fix the helicopter tail boom wallboard forming mold 100 in any of the foregoing embodiments.

As an alternative implementation manner of this embodiment, the first clamping member 7 includes a stop bar 71, a screw 72 and a knob 73, one end of the screw 72 is connected with the knob 73, the other end of the screw 72 is connected with the stop bar 71, and the screw 72 is in threaded connection with the first side 511.

The implementation steps of this embodiment are as follows:

referring to fig. 1, 2 and 3, a mold 100 for forming a helicopter tail boom panel is connected by the above-described embodiment. After the connection is completed, the whole first molding cavity 11 and the second molding cavity 21 are wrapped by air-felt, and are fixed by high-temperature-resistant adhesive tapes, so that the air permeability of the mold during curing is ensured, and the part scrapping caused by puncturing of a vacuum bag by the connection protruding part is prevented. The first U-shaped forming dies 1 and the second U-shaped forming dies 2 which are connected with each other are respectively placed in the corresponding mounting grooves 51, a layer of strippable stripping cloth is paved on the surface of each first U-shaped forming die 1 and the surface of each second U-shaped forming die 2, and the first U-shaped forming die 1 and the second U-shaped forming dies 2 are fixed in the mounting grooves 51 by the corresponding first clamping piece 7 and the second clamping piece 8, so that the barrier strips 71 are in non-stress contact with the vertical inner surfaces of the first U-shaped forming dies 1 (or the second U-shaped forming dies 2). After the fixation is completed, a target is inserted into the target hole 6, the laser tracker is used for fitting target point data on the paving tool 200 of the tail oblique beam wallboard of the helicopter into a three-dimensional digital model of the workpiece, and then corresponding paving information and skin blanking information are generated. After fitting, inputting the corresponding target point data into a projection system, and paving the prepreg sheet on the first U-shaped forming die 1 according to the projection sequence and the position. After the paving is finished, the first clamping piece 7 and the second clamping piece 8 at the first U-shaped forming die 1 are unscrewed. The first U-shaped forming die 1 is in a freely up-and-down moving state, then the first U-shaped forming die 1 is turned over for 180 degrees, the first U-shaped forming die 1 and the second U-shaped forming die 2 are combined through a positioning piece (which is inserted into the first positioning pin hole 91 and the second positioning pin hole 92 to realize quick positioning) arranged outside the net size of the die, and then the second U-shaped forming die 2 is paved by the same method. And filling carbon fiber prepreg monofilaments in the R region, wherein the filling amount of the carbon fiber prepreg monofilaments is 110% of the theoretical value. And then vacuum is pumped for precompaction. After compaction, the side skin is laid, and after the side skin is laid, a pre-cured air soft mold forming die is used, wherein the air soft mold forming die comprises a carbon fiber-containing interlayer 102 arranged at the middle position and air rubber soft molds 103 arranged at two sides of the carbon fiber-containing interlayer 102. The air soft mold is suspended and fixed to the first U-shaped mold 1 by the carbon fiber lug 104. After pre-compacting for at least 30min by vacuumizing, opening a locking switch to enable the whole combination of the preformed body and the composite material forming die to be in a free state, wrapping the whole die by using an air felt, and wrapping the whole preformed combination by using a vacuum bag with the width not less than 1.5 times of the width of the outer contour line of the H-shaped forming die after combination. And a vacuum nozzle is arranged in the upward molded surface of the upper skin molding die. If necessary, a vacuum nozzle may be placed on the outer surface of the side skin molding die. After at least 10min of total precompaction. Vacuum in the bag is maintained, and integral leak detection is carried out. After the completion, remove whole assembly from lower U type skin shop and paste the mould, because weight lightens greatly, can move into autoclave platform through manual or mechanical mode of transporting and solidify in, can improve autoclave's availability factor by a wide margin because occupation area is very little.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims

1. The utility model provides a forming die of helicopter tail sloping wallboard which characterized in that includes:

the first U-shaped forming dies are arranged in parallel along the length direction of the first U-shaped forming dies and are sequentially detachably connected and fixed, and the first U-shaped forming dies are provided with first forming cavities for placing skins;

the second U-shaped forming dies are arranged in parallel along the length direction of the second U-shaped forming dies and are sequentially detachably connected and fixed, and the second U-shaped forming dies are provided with second forming cavities for placing skins; the first U-shaped forming dies and the second U-shaped forming dies are placed in one-to-one correspondence, the first U-shaped forming dies are fixedly connected above the second U-shaped forming dies, so that an opening of the first forming die cavity and an opening of the second forming die cavity are oppositely arranged to form an I-shaped structure, and an R region is formed between the first U-shaped forming dies and the second U-shaped forming dies;

and the shape of the carbon fiber monofilament block is matched with the shape of the R region, and the R region is filled with the carbon fiber monofilament block.

2. The helicopter tail boom wallboard forming die of claim 1, wherein two adjacent first U-shaped forming dies are connected in a positioning manner by a positioning pin, and two adjacent second U-shaped forming dies are connected in a positioning manner by another positioning pin.

3. The helicopter tail boom wallboard molding die of claim 1, wherein two adjacent first U-shaped molding dies are connected by bolt fastening, and two adjacent second U-shaped molding dies are connected by another bolt fastening.

4. The molding die of the helicopter tail boom wallboard of claim 1, wherein the first U-shaped molding die is provided with a first positioning pin hole, the length direction of the first positioning pin hole is perpendicular to the bottom surface of the first molding cavity, the second U-shaped molding die is provided with a second positioning pin hole, and the length direction of the second positioning pin hole is perpendicular to the bottom surface of the second molding cavity.

5. The helicopter tail boom wallboard forming die of claim 1, wherein a first circular arc angle is formed on a side surface of the first U-shaped forming die, which faces away from the first forming die, a second circular arc angle is formed on a side surface of the second U-shaped forming die, which faces away from the second forming die, and the R region is formed between the first circular arc angle and the second circular arc angle.

6. The helicopter tail boom wallboard molding die of claim 1, wherein a fit gap between two adjacent first U-shaped molding dies is no greater than 0.05mm, and a fit gap between two adjacent second U-shaped molding dies is no greater than 0.05mm.

7. The helicopter tail boom wallboard forming mold of claim 1, wherein surfaces of the first forming cavity and the second forming cavity are covered with a peelable release cloth.

8. The helicopter tail boom wallboard forming mold of claim 1, wherein the first U-shaped forming mold and the second U-shaped forming mold have a thickness of 7mm.

9. The utility model provides a shop's frock of pasting of helicopter tail sloping wallboard, its characterized in that, shop's frock includes support, first holder and second holder, the support is equipped with the mounting groove, the mounting groove has relative first side and the second side that sets up, first side is equipped with adjustable first holder and second holder and can be fixed with helicopter tail sloping wallboard forming die centre gripping according to any one of claims 1-8.

10. The tooling for laying down a tail boom wallboard of a helicopter of claim 9, wherein the first clamping member comprises a barrier strip, a screw and a knob, wherein one end of the screw is connected with the knob, the other end of the screw is connected with the barrier strip, and the screw is in threaded connection with the first side.