KR101051193B1 - Mold assembly for manufacturing helicopter rotor blades - Google Patents

Abstract

The present invention relates to a mold assembly for manufacturing a helicopter rotor blade, comprising: an upper mold having a cavity having a half shape of an article; A lower mold having a cavity having a shape of the other half of the product, and having a mold coupled with the upper mold to form a closed mold; An upper fixing stand fixed to the upper surface of the upper mold and having fasteners formed at both end surfaces thereof; A lower fixing stand in close contact with the rear surface of the lower mold to stably support the lower mold; A plurality of the upper mold and the lower mold is installed at a long distance with a predetermined interval, and comprises a tension bolt that absorbs the deformation during thermal expansion and thermal contraction while binding the upper mold and the lower mold up and down.

Through this, it is possible to freely and smoothly mold by using a closed mold, easy to control pressure by using a bolt with a spring, to apply temperature uniformly throughout the product during curing, and to check the temperature of the product. Dignity is improved.

In addition, it is easy to demould (deform) after molding, easy to assemble between parts of the product, the product can be molded by simple heating operation without using vacuum pressure, and easy to assemble and dismantle the closed mold through the handling device. Can be.

Hermetic molds, mold assemblies, helicopters, rotors, blades

Description

Mold assembly for manufacturing helicopter rotor blades {MOLD ASSEMBLY FOR MANUFACTURING HELICOPTER ROTOR BLADE}

The present invention relates to a mold assembly for manufacturing a helicopter rotor blade, and more particularly, because the hollow space or pores do not occur inside the blade during manufacture of the rotor blades, the tissue is dense, and the temperature and pressure during curing are uniform due to cooling shrinkage The invention relates to a mold assembly for manufacturing a helicopter rotor blade which is improved to manufacture a rotor blade for a higher quality helicopter by preventing damage of the metal.

In general, a helicopter (Helicopter) is a main rotor installed on the upper part of the fuselage, that is, the aircraft that can rotate and float almost vertically without a runway by rotating the main rotor blade, and can move in the front and rear and right and left directions as well as in the air. It has a functional feature that can stop at.

At this time, a tail rotor (ie, auxiliary rotor blade) is further installed in the tail portion of the fuselage to prevent the fuselage of the helicopter from being rotated together and maintain the direction due to the rotation of the main rotor. There is also disclosed a form in which two rotors are installed and rotated in opposite directions to prevent rotation of the fuselage.

As such, the tail rotor, including the main rotor, is a very important member for the flight of the helicopter, and in particular, the durability of the blades constituting them is required to be excellent.

However, in the related art, since the blade has been manufactured using an open mold, the durability is poor.

For example, in the aerospace industry, especially helicopters, the use of composites has been increased to reduce the unit manufacturing costs associated with main rotors or tail rotors, and these composites have the advantage of easy structural and mechanical applications through various arrangements. In spite of having a tool that can be directly molded, the composite product or composite assembly product made of composite material is mounted on the open mold 10 as shown in FIG. It was formed into a product by applying a vacuum pressure with heating, and then cooled and cured to produce a product.

In addition, it was common to manufacture the blades divided into up and down in the form of semi-finished products and then bonded to each other or fastened in other ways.

Therefore, in the case of a large blade used as the main rotor, even though the product is very large, it was molded through the open mold 10, so that the vacuum equipment including the heating equipment for forming the mold is complicated and difficult to control. It takes a lot of time, there was a drawback that the manufacturing costs also increased rapidly.

In addition, when the product is cured after molding, the whole product may not be uniformly cured, nor may be cooled, resulting in poor shrinkage or shrinkage deformation, resulting in damage to the product, thereby lowering the error rate and densifying the internal structure of the product. There was also a disadvantage that the durability is significantly reduced due to poor adhesion between the composite products due to voids, porosity (porosity) is generated.

Furthermore, since the mold itself is a single-mold, the releasability of the molded product is bad, and eventually, assembling of the product is delayed.

The present invention was created in view of the above-mentioned problems in the prior art, and can be manufactured at a time by using a hermetically sealed mold for a rotor rotor blade. The uniform temperature is applied throughout the product, minimizing damage to the product, and it is easy to assemble because it has a target that facilitates laser operation when stacking composite materials or assembling parts for product manufacturing. It provides a mold assembly for helicopter rotor blade manufacturing that makes it possible to make a blade for a helicopter rotor easily by simple heating operation without using vacuum pressure. solution There is a problem.

The present invention provides a means for achieving the above object, the upper mold and the cavity having a half shape of the product; A lower mold having a cavity having a shape of the other half of the product, and having a mold coupled with the upper mold to form a closed mold; An upper fixing stand fixed to the upper surface of the upper mold and having fasteners formed at both end surfaces thereof; A lower fixing stand in close contact with the rear surface of the lower mold to stably support the lower mold; A plurality of the upper mold and the lower mold is installed on the long side at a predetermined interval, characterized in that it comprises a tension bolt that absorbs the deformation during thermal expansion and thermal shrinkage while binding the upper mold and the lower mold up and down. Provided is a mold assembly for manufacturing a helicopter rotor blade.

In this case, a plurality of pockets may be formed in the upper surface of the upper mold and the rear surface of the lower mold.

In addition, the pocket may have a lattice shape.

In addition, a thermocouple may be further installed in at least one of the pocket and the long side of the upper mold.

In addition, it is preferable that at least one laser target mounting groove is installed in the upper mold and the lower mold in the longitudinal direction.

At this time, at least one or more type coupling guide bosses or key slots may be formed at the place where the upper mold and the lower mold are type-coupled.

In addition, a key and a key groove may be further formed at both ends in the longitudinal direction of the surface in which the upper mold and the lower mold are coupled to each other.

Meanwhile, a root sliding block is installed at one end in a longitudinal direction of the surface where the upper mold and the lower mold are coupled to each other, and a tip sliding block is installed at the other end opposite to the root sliding block, and inside the tip sliding block. Preferably, a balancing part sliding block in contact with the tip sliding block is further installed.

In addition, at least two bushing buttons having a round roof shape may be further installed on the bottom of the root side of the helicopter rotor blade on the surface of the lower mold.

In addition, the tension bolt is a rod penetrating the upper mold and the lower mold up and down, the nut is fastened to the lower end of the rod, the bolt is fastened to the top of the rod, the rod is fitted to the bolt and the upper It is preferable that it consists of a spring washer interposed between molds.

In addition, the fastener and the bolt is fastened by the bolt further comprises a handling device, characterized in that for rotating or moving up and down, the handling device is characterized in that the movement along the guide rail.

In this case, the handling device includes a main body seated on the guide rail, an operation cylinder fixed to the upper end surface of the main body and having a cylinder rod, a motor base fixed to the cylinder rod of the operation cylinder, and fixed to the motor base. It may be configured to include a drive motor, a gearbox built-in gear to reduce the rotational force of the drive motor and fixed on the motor base, and a rotating shaft connected to the gearbox and fastened to the fixture.

In addition, it is particularly preferable that the working cylinder is a hydraulic cylinder or a pneumatic cylinder.

The mold assembly for manufacturing a helicopter rotor blade according to the present invention provides the following effects.

First, molding is free and smooth by using a closed mold.

Second, it is easy to adjust the pressure by using a bolt with a spring.

Third, the temperature can be uniformly applied throughout the product during curing, and the quality of the product can be improved by checking the temperature.

Fourth, it is easy to demould (release) after molding, and easy assembly between parts of the product.

Fifth, the product can be molded by simple heating without using vacuum pressure.

Sixth, it is possible to easily assemble and dismantle the closed mold through the handling means.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment according to the present invention.

Figure 2 is an exemplary perspective view showing a mold for manufacturing a helicopter rotor blade according to the present invention, Figure 3 is a perspective view and an enlarged view showing the mold assembly for manufacturing a helicopter rotor blade according to the present invention, Figure 4 is a mold assembly according to the present invention Exemplary perspective view showing only the weight of the upper mold, Figure 5 is an exemplary perspective view showing only the lower mold of the mold assembly according to the invention, Figures 6, 7 is an enlarged perspective view of the main portion of the mold assembly according to the present invention, 8 is a cross-sectional view of main parts of the mold assembly according to the present invention, and FIGS. 9 and 10 are exemplary views showing a moving means of the mold assembly according to the present invention.

As shown in Figures 2 to 5, the present invention, unlike the conventional manufacturing by performing a heating and vacuum treatment at the same time when manufacturing a blade for a helicopter rotor, a simple heating operation (heated nitrogen or air without a vacuum treatment) By using only to increase the temperature of the mold) to improve the product molding, for this purpose includes a closed mold consisting of the upper mold 100 and the lower mold (200).

In addition, the upper mold 100 and the lower mold 200 is formed in a shape corresponding to each other is configured to be coupled, and in particular, the surface facing each other via the via so as to form a product, such as a helicopter rotor blades The space, ie cavity C, is formed in the shape of the product.

At this time, the cavity (C) is formed in the upper mold 100, half is formed, the remaining half is formed in the lower mold 200 by forming a closed mold through the mold combination of the two molds (100,200) It is configured to maintain the complete product shape.

In addition, a plurality of pockets P are formed on each rear surface of the upper mold 100 and the lower mold 200, that is, opposite surfaces of the surfaces in contact with each other.

The pocket P may have various shapes, but a quadrangular shape is preferable.

In particular, when the pocket P is not formed when the pocket P is heated as a whole in order to manufacture a product such as a rotor blade, which is a large structure, the heat transfer speed is low and thus the heat cannot be heated evenly in a short time. By installing the pocket (P) it is possible to quickly heat without deformation of the mold and thereby prevents damage to the product due to thermal expansion and shrinkage during curing after curing.

In addition, it can contribute to weight saving of the mold and consequently cost reduction.

In addition, the pocket (P) may be a lattice shape as illustrated in FIG. 2, or may be a simple concave shape as illustrated in FIG. 4, and may be variously modified without being limited to a specific form. .

In addition, a thermocouple insertion hole H as shown in FIG. 4 is formed in a part of the pocket P or a part of both sides of the upper mold 100 and the lower mold 200.

At this time, the thermocouple insertion hole (H) is a hole for guiding the thermocouple (Thermocouple), which is a temperature measuring element, can be inserted and installed, the upper mold 100 and the lower mold 200 during molding through the thermocouple installation By measuring the heat generated from the inside it can be used to control the uniform temperature distribution throughout the mold assembly using the measured value.

For example, one example may be to more easily control the heat applied to a non-uniform part by referring to the temperature distribution measured by the thermocouple.

In addition, as shown in Figures 4 and 5, the upper mold 100 and the lower mold 200 may be formed with a laser target installation groove (L) at a predetermined interval along the long side direction.

The laser target installation groove (L) is to provide a baseline, that is, a point when laminating a composite material (usually a material in which resin and fibers are mixed and laminated) or sealing an assembly of the present invention. A laser target (not shown) is installed at (L).

In addition, the boss 202 and the key slot 204 having a shape as shown in FIG. 5 are formed in order to induce mold coupling and accurate coupling between the upper mold 100 and the lower mold 200. 100 and the lower mold 200 are provided to be coupled to each other at a specific position.

Accordingly, when the upper mold 100 and the lower mold 200 are fitted to each other in a state in which the upper mold 100 and the lower mold 200 are in contact with each other based on the boss 202 and the key slot 204, the upper mold 100 and the lower mold 100 are lowered. Robust and stable mold coupling of the mold 200 can be easily carried out easily.

On the other hand, as shown in Figure 3, the upper and lower molds in the upper mold 100 and the lower mold 200 coupled in the vertical direction, the upper fixing stand 110 and the lower fixing stand 210 for fixing them are installed do.

At this time, both sides of the upper fixing stand 110 is formed with a fastener 112 for providing ease of gripping when rotating or moving the mold assembly according to the present invention.

In addition, the tension bolt 300 is installed as a part for minimizing mold deformation due to thermal expansion of the product in the upper mold 100 and the lower mold 200 when molding the product using the mold assembly.

The tension bolt 300 includes a rod 302 inserted through the edges of the upper mold 100 and the lower mold 200 up and down, a nut 304 fixed to a lower end of the rod 302, and The bolt 306 is fastened to the upper end of the rod 302 and consists of a spring washer 308 interposed between the bolt 306 and the upper mold 100.

Therefore, even when the upper mold 100 and the lower mold 200 are flowed by the heat generated inside the mold assembly, the spring washer 308 absorbs and buffers all of them, so that the mold is warped or misaligned due to thermal deformation. Product defects derived from poor binding can also be prevented.

In addition, it is preferable that a plurality of such tension bolts 300 are installed at a predetermined interval along the edge (edge) of the mold assembly.

On the other hand, as shown in Figures 4 to 7, the longitudinal ends of the upper mold 100 and the lower mold 200, the portion where they are engaged is rounded upward to approximately the shape of the blade for the rotor, A part of the rounded portion is configured to include a sliding block to be slidable in the longitudinal direction of the upper mold 100 and the lower mold 200.

At this time, in the longitudinal direction of the rotor blade, which is a product to be molded, a part assembled to the rotating shaft of the helicopter is called a root part, and the opposite part is called a tip part, and the sliding block has a root part. It is divided into a root sliding block 400a to be installed and a tip sliding block 400b to be installed at the tip, and both the upper mold 100 and the lower mold 200 are formed to correspond to each other up and down at the same position.

And, the root sliding block 400a and the tip sliding block 400b are all installed in such a manner as to be separated from each mold, that is, the upper mold 100 and the lower mold 200, respectively.

In particular, the balancing part sliding block 400c may be further installed inside the tip sliding block 400b in the longitudinal direction of the blade, in which case the balancing part is the same as the reference point installed to catch the static balancing after the blade is manufactured. The sliding blocks 400b and 400c installed in this portion are responsible for a kind of buffering function to absorb thermal expansion of the portion.

In addition, the balancing part sliding block 400c is configured to be movable by being fastened to a hole having a long hole shape by the fixing bolt 410a, and the tip part sliding block 400b is assembled to be fitted by a bracket 410b. It is configured to be sliding.

Thus, the root sliding block 400a prevents damage or damage to the root portion of the product caused by deformation of the upper or lower molds 100 and 200 caused by thermal expansion during heating and thermal contraction upon cooling, and poor tissue arrangement. The sliding block 400b and the balancing part sliding block 400c prevent damage to the balancing part and the tip part of the product.

In addition, a resin discharge groove (G) is formed in the tip portion in which the upper mold 100 and the lower mold 200 are coupled to each other, and extends to the end of the mold. By smoothly discharging the resin escaped from the process of curing to the outside of the mold assembly, it is possible to prevent the phenomenon that the product is fixed to the mold and is not easily separated after the molding is completed.

In addition, as shown in Figure 7, the key to be inserted into each other in the vicinity where the first and second sliding blocks (400a, 400b) is installed for a more perfect coupling between the upper mold 100 and the lower mold 200 206 and keyway 208 may be further formed.

In this case, the key 206 and the key groove 208 is formed in the form that the key 206 is protruded on the inner surface of the upper mold 100, the key groove 208 is formed on the inner surface of the lower mold 200. Most preferably, but need not necessarily be limited to, and vice versa.

In addition, these keys 206 and the key grooves 208 are the final mold access guide members (Mold Final Approach Means) when the upper mold 100 and the lower mold 200 is finally molded in the upper part when forming a closed mold Finally, mismatch between the mold 100 and the lower mold 200 is minimized.

Furthermore, as shown in FIG. 8, at least two bush positioning buttons (Bush Locating Button) B may be installed at the bottom of the root side of the helicopter rotor blade on the surface on which the lower mold is molded. The bushing positioning button (B) has a substantially round roof shape, and the bush for protecting the shape of the hole when de-molding the blade after hardening is in line contact with the rounded portion of the bushing positioning button. Thus, the bush and the bushing positioning button can demold the blade after hardening without difficulty without interfering with each other.

On the other hand, Figures 9 and 10 disclose a handling device 500 for moving the closed mold according to the present invention or more easily mold coupling the upper mold 100 and the lower mold 200.

9 and 10, the mold assembly according to the present invention is provided in a form in which the fasteners 112 provided at both ends of the upper fixing stand 110 are bolted to the rotating shaft 510 of the handling device 500. The rotary shaft 510 is connected to the driving motor 514 through the gear box 512 is configured to receive the rotational force.

Accordingly, the upper fixing unit 110 having the fixing unit 112 fixed to the rotating shaft and the bolt by the driving of the driving motor 514 is in a rotatable state, and thus the upper fixing unit 110 is coupled thereto. Of the lower mold 210 and the upper mold 100 and the lower mold 200, which are fixed to each of the fixed brackets and coupled to each other, may be rotated based on the rotation center of the rotation shaft 510 of the handling device 500. (See Figure 3).

At this time, by adjusting the gear ratio of the power transmission gear installed in the gear box 512, it is of course possible to control the speed at which the mold assembly is rotationally driven.

In addition, the gear box 512 including the driving motor 514 is installed on the motor base 516, the motor base 516 is provided in a state separated from the main body 520, the motor The base 516 and the main body 520 are connected by a combination of the operation cylinder 530 and the cylinder rod 532.

That is, the operation cylinder 530 is fixed to the main body 520, the cylinder rod 532 is fixed to the motor base 516, the cylinder rod 532 is connected to the operation cylinder 530 restrained By doing so, as the cylinder rod 532 is drawn out or drawn in according to the lifting operation of the operation cylinder 532, the motor base 516 can be moved in the vertical direction.

At this time, the pressure generating means used in the operation cylinder 530 is hydraulic or pneumatic.

In addition, the main body 520 is seated to be movable along the guide rail (R), it is possible to easily move the mold assembly of the present invention fixed to the handling device.

As a result, the convenience of the work is improved and the blade product can be produced more precisely and elegantly.

1 is a partial illustration of an open mold for manufacturing a rotor blade according to the prior art,

2 is an exemplary perspective view showing a mold for manufacturing a helicopter rotor blade according to the present invention;

3 is a perspective view and an enlarged view of a main part of a mold assembly for manufacturing a helicopter rotor blade according to the present invention;

4 is an exemplary perspective view showing only the upper mold of the mold assembly according to the present invention;

5 is an exemplary perspective view showing only the lower mold of the mold assembly according to the present invention;

6,7 is an enlarged perspective view of main parts of the mold assembly according to the present invention;

8 is a cross-sectional view of main parts of a mold assembly according to the present invention;

9 and 10 are exemplary views showing a moving means of the mold assembly according to the present invention.

♧ description of the symbols for the main parts of the drawing ♧

100 .... top mold 110 .... top mount
112 .... Government 200 .... Lower Mold
202 Boss ... 204 Keyslot
206 ... Key 208 Key Home
210..Lower fixator 300..Tension bolt
302 .... Rod 304 .... Nut
306 ... bolt 400a ... root sliding block
400b ... sliding tip block 400c ... sliding block

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500 .... Handling device 510 .... Spindle
512 .... gear box 514 .... drive motor
516 .... motor base 520 .... body
530 .... Operating cylinder 532 .... Cylinder rod
B .... Bush positioning button C .... Cavity
G .... Resin outlet groove H .... Thermocouple insertion hole
L .... Laser target mounting groove P .... Pocket
R .... Guide rail

Claims (13)

An upper mold having a cavity having a half shape of a product; A lower mold having a cavity having a shape of the other half of the product, and having a mold coupled with the upper mold to form a closed mold; An upper fixing stand fixed to the upper surface of the upper mold and having fasteners formed at both end surfaces thereof; A lower fixing stand in close contact with the rear surface of the lower mold to stably support the lower mold; It is provided with a plurality of predetermined intervals on the long sides of the upper mold and the lower mold, and includes a tension bolt that absorbs the deformation during thermal expansion and thermal contraction while binding the upper mold and the lower mold up and down, A root sliding block is installed at one end in the longitudinal direction of the surface where the upper mold and the lower mold are coupled to each other, a tip sliding block is installed at the other end opposite to the root sliding block, and a tip sliding inside the tip sliding block. A mold assembly for manufacturing a helicopter rotor blade, characterized in that a balancing block sliding block in contact with the block is further installed. The method according to claim 1; The mold assembly for manufacturing a helicopter rotor blade, characterized in that a plurality of pockets are recessed in the upper surface of the upper mold and the lower mold. The method according to claim 2; The pocket assembly of the helicopter rotor blade manufacturing, characterized in that the pocket is made of a grid. The method according to claim 2; At least one of the pocket and the long side of the upper mold mold assembly for helicopter rotor blades characterized in that the thermocouple is further installed. The method according to claim 1; The mold assembly for helicopter rotor blade manufacturing, characterized in that the upper mold and the lower mold is processed at least one laser target mounting groove for the laser target installation in the longitudinal direction. The method according to claim 1; The mold assembly for manufacturing a helicopter rotor blade, characterized in that at least one or more type coupling guide bosses or key slots are formed in the place where the upper mold and the lower mold is coupled. The method according to claim 6; The mold assembly for manufacturing a helicopter rotor blade, characterized in that the upper mold and the lower mold is formed at both ends in the longitudinal direction corresponding to each other the key and the key groove is inserted into each other. delete The method according to claim 1; At least two bushing positioning buttons having a round roof shape are further installed on the bottom of the root portion of the helicopter rotor blade on the surface where the product of the lower mold is formed. The method according to claim 1; The tension bolt includes a rod penetrating the upper mold and the lower mold up and down, a nut fastened to a lower end of the rod, a bolt fastened to an upper end of the rod, and interposed between the bolt and the upper mold. Mold assembly for manufacturing a helicopter rotor blade, characterized in that consisting of a spring washer. The method according to claim 1; And a handling device which is fastened by the fastener and the bolt to rotate or move the fixture up and down, wherein the handling device is moved along the guide rail. The method of claim 11; The handling device includes a main body seated on a guide rail, an operation cylinder fixed to an upper end surface of the main body and having a cylinder rod, a motor base fixed to the cylinder rod of the operation cylinder, and a driving motor fixed to the motor base. And, Helicopter rotor, characterized in that it comprises a gear box built in the gear to control the rotational force of the drive motor and fixed on the motor base, and a rotating shaft connected to the gear box and fastened to the fixture Mold assembly for blade manufacture. The method of claim 12; The actuating cylinder is a mold assembly for manufacturing a helicopter rotor blade, characterized in that the hydraulic cylinder or pneumatic cylinder.

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