JP2620334B2 - Method and apparatus for producing fiber reinforced plastic ring - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a method for manufacturing a fiber-reinforced plastic ring and an apparatus for manufacturing the same, and more particularly to a method for manufacturing a fiber-reinforced plastic ring having a Z-shaped cross section using a filament winding device. And its device.

[Related Art] A ring-shaped composite material using a fiber-reinforced plastic material has been widely used in recent years as a material for aircraft and the like. Japanese Patent Application Laid-Open No. 58-96522 discloses that a fiber yarn is helically wound on two disks by a filament winding device, further hoop-wound in a gap between the two disks, then laminated on the outer peripheral portion, and then pressure-cured. A method for manufacturing a T-shaped or L-shaped ring-shaped composite material is disclosed. This method has an advantage that a ring-shaped composite material having a T-shaped or L-shaped cross section can be manufactured with high efficiency and low cost because a filament winding device is used, but the bending strength is particularly suitable for an aircraft fuselage frame. It was not possible to manufacture a ring-shaped composite material frame having a Z-shaped cross section excellent in quality.

As a method of manufacturing the ring-shaped composite material frame having the Z-shaped cross section, a hand lay-up method of laminating a woven or tape machine on a Z-shaped mandrel by hand lay-up has been known.

[Problems to be Solved by the Invention] However, since this hand lay-up method manually performs pre-cut and lamination of a weaving machine or a tape machine,
There was a problem that the cost was high. In addition, the woven material or tape material is overlapped (lap splice) as shown in FIG. 12 in terms of yield and orientation in the fiber direction,
There are also disadvantages in that the lightness is impaired and the cost is high, and that the lap joint is locally thickened, making it difficult to fasten a fastener to a mating part.

Accordingly, an object of the present invention is to provide a method and an apparatus for manufacturing a fiber reinforced plastic ring which enables the use of a filament winding device and which can produce a lightweight and high strength Z-shaped cross section fiber reinforced plastic ring without splicing at low cost. To provide.

Means for Solving the Problems In order to achieve this object, a method for producing a fiber reinforced plastic ring according to the present invention has a step portion in which a boundary between a large-diameter outer peripheral portion and a small-diameter outer peripheral portion is substantially vertical. A main mandrel and an auxiliary mandrel whose outer diameter is substantially the same as the outer diameter of the main mandrel are attached to the rotating shaft so that the auxiliary mandrel is located on the outer side of the outer diameter of the main mandrel. After winding the fiber-reinforced plastic filaments on the main and auxiliary mandrels in a state where the main and auxiliary mandrels are separated from each other by a predetermined distance, the main and auxiliary mandrels are brought into close contact with each other, and the inner circumference is A tack ring having an L-shaped cross section having substantially the same diameter as the small-diameter outer peripheral portion of the main mandrel and a step portion of the main mandrel are fitted to each other. Then, the above-mentioned laminated filamentous material has a Z-shaped cross-sectional shape, and the curing treatment of the above-mentioned laminated filamentous material is performed in this state.

In the case of this method, a spacer is interposed between the main mandrel and the auxiliary mandrel to form the predetermined space therebetween, the spacer is removed after winding the prepreg thread, and the tack ring is removed. It is preferable that the main mandrel slides on the rotary shaft and is fitted to the stepped portion, and the main mandrel and the auxiliary mandrel are brought into close contact by pushing the auxiliary mandrel by the slid tack ring.

Also, the winding of the filament is performed by a first helical winding performed on the main and auxiliary mandrels, a hoop winding performed on a large-diameter outer peripheral portion of the main mandrel after the helical winding, and the main winding after the hoop winding. And at least a second helical winding made on the auxiliary mandrel.

The manufacturing apparatus according to the present invention further includes: a rotating shaft; a main mandrel attached to the rotating shaft and having a step portion in which a boundary between a large-diameter outer peripheral portion and a small-diameter outer peripheral portion is substantially vertical; An auxiliary mandrel slidably mounted in the axial direction on the rotating shaft so as to be located on the outer peripheral side of the small diameter, and having an outer diameter substantially the same as the outer peripheral diameter of the small diameter of the main mandrel; and the main mandrel and the auxiliary A spacer interposed between the mandrel and forming a predetermined gap therebetween;
Attached slidably in the axial direction to the rotating shaft so as to sandwich the auxiliary mandrel between the main mandrel,
An inner periphery is provided with a tack ring having an L-shaped cross section having substantially the same diameter as the outer periphery of the small diameter of the main mandrel, and the main and auxiliary mandrels with the spacer interposed therebetween are formed by laminating fiber-reinforced plastic filaments. It is to be wound.

[Operation] Since the winding of the filament is performed in a state where the main mandrel and the auxiliary mandrel are separated from each other by a predetermined distance, the filament wound on the step portion is brought into close contact with the main and auxiliary mandrels thereafter. Loosening occurs. Therefore, the thread at the step is deformed along the shape of the step by fitting the tag ring with the step of the main mandrel, whereby the laminated thread has a Z-shaped cross section. Thus, a fiber reinforced plastic ring having a Z-shaped cross section can be manufactured using the filament winding device.

[Embodiment] An embodiment of a method for manufacturing a fiber-reinforced plastic ring and an apparatus therefor according to the present invention will be described below with reference to FIGS.

In FIG. 1, a main mandrel 2 for lamination is provided on a rotating shaft 1.
The laminating auxiliary mandrel 3 is attached to the laminating main mandrel 2. The laminating main mandrel 2 is fixed to the rotating shaft 1 so as not to move in both the rotational direction and the axial direction, and the laminating auxiliary mandrel 3 is fixed in the rotational direction. It is slidable in the axial direction.
A step 2a is formed on the outer peripheral portion of the main mandrel 2, and the step 2a is formed by a large-diameter outer peripheral portion 2b, a small-diameter outer peripheral portion 2c, and a boundary wall 2d. The auxiliary mandrel 3 has an outer diameter determined to be the same as that of the small-diameter outer peripheral portion 2c of the main mandrel 2, and is attached to the rotating shaft 1 on the small-diameter outer peripheral portion 2c side, that is, opposed to the small-diameter outer peripheral portion 2c. Between the main and auxiliary mandrels 2 and 3, a plurality of spacers 4 are arranged at intervals in the circumferential direction. The spacer 4 has an opening formed in the auxiliary mandrel 3 and can be taken in and out of the opening.

A laminated tack ring 5 is attached to the rotating shaft 1 so as to be slidable in the axial direction and to face the auxiliary mandrel 3. The outer periphery 5a of the tack ring 5 is formed in an L-shaped cross section, and the inner periphery 5b has the same diameter as the small diameter outer periphery 2c of the main mandrel 2 or is slightly larger.

 Next, the operation of this embodiment will be described.

As shown in FIG. 1, the main and auxiliary mandrels 2 and 3
With the spacers 4 separated by a predetermined distance, the rotary shaft 1 is rotated as shown in FIG. 2 to remove the roving thread 6 made of carbon, glass, aramid, or the like into a thermosetting or thermoplastic resin. Helical winding is performed while impregnating the fiber material or using a thread 6 such as prepreg globbing or prepreg tape already impregnated with a fiber resin. Thereafter, as shown in FIG. 3, hoop winding is performed on the outer periphery 2b of the large diameter portion, and helical winding shown in FIG. 2 is performed again. After the stack of the filaments 6 is thus formed, the spacer 4 is removed radially inward through the opening. Next, as shown in FIG. 4, the tacking ring 5 is slid on the rotating shaft 1 toward the main mandrel 2 to push the auxiliary mandrel 3 so as to be in close contact with the main mandrel 2 and to make an L-shaped cross section of the ring 5. 5a
Is fitted to the step 2a. Thereby, the thread laminate 7 is formed.
Is transformed into a Z-shaped cross section.

The deformation of the thread-like laminate 7 into a Z-shaped cross section is allowed by the close movement of the auxiliary mandrel 3 to the main mandrel 2. That is, the helically wound thread-like laminate 7 (two-dot chain line) is loosened due to the close contact of the auxiliary mandrel 3 and is fitted along the small-diameter outer peripheral portion 2c and the boundary wall 2d by fitting the L-shaped cross-section 5a. It can be transformed into a shape. Accordingly, the thickness of the spacer 4, that is, the gap between the main mandrel 2 and the auxiliary mandrel 3 is set so that the linear thread laminate 7 in a two-dot chain line can be transformed into a solid right-angle bent thread laminate 7. Stipulated.

Thereafter, the ring 5 is removed, and the thread laminate 7 is cut at predetermined positions P1 and P2 as shown in FIG.
It is covered with a vacuum bag and cured by heating and pressure in an autoclave. Thus, the forming of the thread laminate 7 using the main mandrel 2 as a mold is completed. Of course, the heating is performed when the resin is thermosetting, and when the resin is thermoplastic, cooling is performed.

The above is an example in which warp winding is performed only on the large-diameter outer peripheral portion 2b. Next, an example in which hoop grinding is performed on both the large-diameter outer peripheral portion 2b and the small-diameter outer peripheral portion 2c will be described.

After hoop winding to the large-diameter outer peripheral portion 2b shown in FIG. 3, the spacer 4 is removed, the ring 5 is fitted to the main mandrel 2, and the thread laminate 7 is deformed into a Z-shape. Thereafter, the ring 5 is removed and hoop winding is performed on the small-diameter outer peripheral portion 2c. Thus, as shown in FIG. 6, the large-diameter outer peripheral portion 2b
The hoop-winding thread-like laminates 7b and 7c are formed on the small-diameter outer peripheral portion 2c, respectively. Thereafter, the thread laminate is knife-cut at the boundary P1 between the main mandrel 2 and the auxiliary mandrel 3. Next, after inserting the spacer 4 again between the main and auxiliary mandrels 23 to move the auxiliary mandrel 3 to the original position, the same helical winding as in FIG. 2 is performed again. Thereafter, the spacer 4 is removed, and the ring 5 is fitted to the main mandrel 2 as shown in FIG. 7 to deform the thread-like laminate 7 into a Z-shape. Thus, between the first helical winding laminated layer 7a and the second helical winding laminated layer 7d, the hoop winding laminated layers 7b and 7c are formed on the large diameter outer peripheral portion 2b and the small diameter outer peripheral portion 2c.

The frame having a Z-shaped cross section has a flange portion that receives tensile and compressive loads and a web portion that receives shear loads. As described above, efficient hoop winding with respect to tensile and compressive loads is performed using the laminates 7b and 7c. In the case where the web portion is constituted by the helical winding laminates 7a and 7d which are efficient with respect to the shear load, a fiber reinforced plastic ring excellent in strength is obtained.
Further, since the hoop winding laminates 7b and 7c are interposed between the helical winding laminates 7a and 7d, the symmetry is maintained and the occurrence of distortion can be prevented.

FIG. 8 shows a modification of the above embodiment, in which the main mandrel 8 has stepped portions 8a formed on the left and right, and accordingly, the auxiliary mandrel 9, the spacer 10, and the L-shaped laminated tack ring ( (Not shown). Therefore, two thread-like laminates 7 can be formed simultaneously.

FIG. 9 shows a case in which a plurality of eighth mandrels are connected to the rotating shaft 1 and the delivery manipulator of the winding machine is accordingly operated.
11 are installed in the axial direction.

FIG. 10 is a view similar to FIG.
And the prepreg filaments are tacked between the mandrels to form a single row in the axial direction.

FIG. 11 shows a winding machine in which a plurality of delivery dials 11 are provided in the circumferential direction.

In the above embodiment, a spacer is used to separate the main mandrel and the auxiliary mandrel by a predetermined distance during helical winding. However, the present invention is not limited to the spacer, and any holding means can be used as long as the holding means can hold the auxiliary mandrel at a predetermined distance from the main mandrel.

Further, instead of the auxiliary mandrel and the tack ring 5 being configured to be movable, the main mandrel may be configured to be slidable. Of course, the fiber reinforced plastic ring may have a ring shape other than a perfect circle shape.

[Effects of the Invention] As is apparent from the above description, according to the manufacturing method of the present invention, it is possible to manufacture a Z-shaped cross-section fiber reinforced plastic ring having an integral structure at a low cost by using a filament winding device, and to use a conventional method. Problems caused by the hand lay-up method can also be solved.

Further, according to the manufacturing apparatus of the present invention, a Z-shaped cross-section fiber reinforced plastic ring having an integral structure can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a method and an apparatus for manufacturing a fiber reinforced plastic ring according to the present invention, FIG. 2 is a perspective view showing a state of helical winding, and FIG.
The figure is a perspective view showing the state of loop winding.
The figure is a cross-sectional view showing a state deformed into a Z-shaped cross section, FIG. 5 and FIG. 6 are cross-sectional views showing cutting positions of the laminate, and FIG. 8 and 9
FIGS. 10 and 10 are cross-sectional views each showing a modification of the above-described embodiment.
FIG. 11 is a perspective view showing another modification example of the above-described embodiment, and FIG.
The figure is a perspective view showing a fiber reinforced plastic ring manufactured by a conventional hand lay-up method. 1 ... rotating shaft, 2 ... main mandrel, 2a ... step, 2b
… Large diameter outer circumference, 2c… Small diameter outer circumference, 2d …… Boundary, 3 ……
Auxiliary mandrel, 4 ... Spacer, 5 ... Tack ring, 5a ... Outer periphery, 5c ... Inner periphery.

Claims (4)

(57) [Claims] 1. A main mandrel having a step from a vertical boundary wall between a large-diameter outer peripheral portion and a small-diameter outer peripheral portion, and an auxiliary mantrel having an outer diameter substantially the same as the small-diameter outer peripheral portion of the main mandrel. The auxiliary mandrel is attached to the rotating shaft so that it is located on the small diameter outer peripheral side of the main mandrel, and the main and auxiliary mandrels are fiber-reinforced plastics in a state where the main mandrel and the auxiliary mandrel are separated from each other by a predetermined distance. After forming the thread-like laminate by winding the roving thread-like material into a laminate, the main and auxiliary mandrels are brought into close contact with each other, and the inner periphery of the L-shaped cross-section is substantially the same diameter as the small-diameter outer periphery of the main mandrel. The tack ring and the step portion of the main mandrel are fitted to each other to form the thread-like laminate into a Z-shaped cross-section, and in this state, the thread-like laminate prep is formed. Preparation of fiber-reinforced plastic ring, which comprises carrying out the hardening process of the grayed filaments. 2. A spacer is interposed between the main mandrel and the auxiliary mandrel to form the predetermined space between the main mandrel and the auxiliary mandrel,
The spacer is removed after the thread is wound, the tack ring is slid on the rotating shaft and fitted to the step of the main mandrel, and the close contact between the main mandrel and the auxiliary mandrel is determined by the sliding. 2. The method of claim 1, wherein the moving tack ring is formed by pressing the auxiliary mandrel. 3. The winding of the filament includes a first helical winding on the main and auxiliary mandrels, a hoop winding on a large diameter outer peripheral portion of the main mandrel after the helical winding, and a hoop winding on the large diameter outer periphery of the main mandrel. The method for producing a fiber reinforced plastic ring according to claim 1, further comprising at least a second helical winding provided on the main and auxiliary mandrels. 4. A main mandrel having a rotating shaft, a step attached to the rotating shaft, and having a substantially vertical boundary between a large-diameter outer peripheral portion and a small-diameter outer peripheral portion, and a small-diameter outer peripheral side of the main mandrel. An auxiliary mandrel which is slidably mounted on the rotary shaft in the axial direction so as to be located at an outer diameter substantially equal to the outer diameter of the main mandrel, and between the main mandrel and the auxiliary mandrel. The main mandrel is slidably mounted in the axial direction so that the auxiliary mandrel is interposed between the spacer and the main mandrel. A ring for tack having an L-shaped cross section having substantially the same diameter as the outer peripheral portion of the small diameter, and a fiber-reinforced plastic thread is laminated on the main and auxiliary mandrels with the spacer interposed therebetween; Fiber reinforced plastic ring of a manufacturing apparatus characterized in that it is.