JP2018083339A - Carbon fiber pipe molding die, and carbon fiber pipe production method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a carbon fiber pipe molding die capable of easily pulling out a molding die, reduced in labor and waste upon production, further excellent in durability and suitable for mass production, and a carbon fiber pipe production method.SOLUTION: Provided is a carbon fiber pipe molding die provided with: a bar-shaped inner core 2 consisting of a first inner core 21 and a second inner core 22; and an outer core 3 consisting of a plurality of segments long-length in one direction. The outer core 3 is supported by the inner core 2 in a state where the first inner core 21 and the second inner core 22 are arranged in the same straight line, surrounds the inner core 2 in such a manner that the first inner core 21 and the second inner core 22 are projected to the outside, respectively, is wound with an uncured carbon fiber sheet CS, and, after the carbon fiber sheet CS is thermally cured to mold a carbon fiber pipe CP, pulled out from a carbon fiber pipe CP via a hollow part 23 formed when the inner core 2 is pulled out.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a carbon fiber pipe mold that can be easily removed from a pipe after the carbon fiber pipe is molded, and a carbon fiber pipe manufacturing method.

  Conventionally, metal pipes have been used because structural materials for tents used in sports events, festivals, and disasters require strength. In order to develop products that are easy to transport and assemble, alternative materials that are light and strong have been considered.

  In recent years, carbon fibers have begun to be put into practical use in various fields as materials that can meet such demands. If a pipe is made using this carbon fiber, there is a possibility that a pipe that is lighter and stronger than the conventional product can be obtained as the structural material of the tent.

  As a method for producing such a carbon fiber pipe, for example, a method is known in which a release material and a carbon fiber sheet are wound around a cylindrical mold and thermally cured at 150 ° C. to create a cylindrical carbon fiber pipe. Yes. However, when actually manufacturing a carbon fiber pipe, the pipe after thermosetting shrinks due to thermosetting, making it very difficult to remove from the mold. As a result, the inner surface of the pipe could be damaged, and it took time and labor to extract the mold, which resulted in poor productivity.

  As a technique for solving such a problem, for example, in Patent Document 1, a tape is wound around a tapered mandrel in advance to form a forming die, and after forming the hollow tube, A technique is disclosed in which the mandrel is withdrawn and then the tape is removed from the hollow tube. According to this technique, since the mandrel has a tapered shape, the mandrel can be easily pulled out without damaging the inner surface of the pipe after the tape is removed from the hollow tube.

  Further, for example, in Patent Document 2, a prepreg containing a thermoplastic resin having a softening point or a melting point of 160 ° C. to 300 ° C. as a matrix and containing reinforcing fibers, a thermally expandable core made of ultrahigh molecular weight polyethylene, Interposing between the outer mold disposed outside the core, and then heating the prepreg and the core to soften or melt the thermoplastic resin and expand the core, A technique for cooling the prepreg is disclosed. According to this technique, the core contracts during cooling to reduce friction with the pipe, and therefore the core can be easily pulled out.

JP-A-8-52820 JP-A-5-293908

  However, since the prior art disclosed in Patent Document 1 uses a taper-shaped mold (mandrel), for example, when trying to obtain a pipe having the same inner diameter, the taper tip has a narrowed tip. Tapes must also be wound around the circumference, and it takes time and labor to attach and remove the tape every time, and in the case of mass production, there is a problem that a large amount of tape becomes garbage.

  Moreover, since the prior art disclosed in Patent Document 2 uses a molding die (core) made of a rubber tube, it deteriorates more quickly than metal and is easily damaged, so it can be used frequently over a long period of time. There was a problem of being unsuitable.

  The present invention has been made in view of such conventional problems. One of the objects of the present invention is that a mold can be easily pulled out from a carbon fiber pipe made by thermosetting, has less labor and waste during production, has excellent durability, and is suitable for mass production. Another object of the present invention is to provide a carbon fiber pipe mold and a carbon fiber pipe manufacturing method.

Means for Solving the Problems and Effects of the Invention

  According to the carbon fiber pipe mold according to the first aspect of the present invention, the rod-shaped inner core composed of the first inner core and the second inner core, and the first inner core and the second inner core are collinear. The inner core is supported by the inner core and surrounds the inner core so that each of the first inner core and the second inner core protrudes outward, and an uncured carbon fiber sheet is wound around the carbon. After the fiber sheet is thermoset and a carbon fiber pipe is formed, the carbon fiber pipe is extracted from the carbon fiber pipe through a hollow portion formed when the inner core is extracted. And an outer core composed of a plurality of segments. According to the above configuration, the outer core is composed of a plurality of segments, the hollow portion is formed after the inner core is removed, and each of the plurality of segments can be peeled and moved in the direction of the hollow portion. Can be easily extracted from the pipe. In addition, each segment can be extracted in a state sufficiently separated from the inner surface of the carbon fiber pipe, so that the product can be finished without damaging the product. Furthermore, since the inner core is divided into two parts and protrudes from both ends of the outer core to reduce the contact area with the outer core, the inner core can be easily extracted from the outer core.

  Further, according to the carbon fiber pipe mold according to the second aspect of the present invention, the plurality of segments of the outer core is first extracted after the inner core is removed, and in a cross section perpendicular to the longitudinal direction, When the surface forming a part of the outer shape of the outer core is the upper surface, the bottom surface is equal to or smaller than the width of the inner core, and the side surfaces are formed perpendicularly or acutely from both ends of the bottom surface toward the upper surface. A first segment, a second segment extracted second, and at least one third segment extracted after extracting the second segment can be provided. According to the above configuration, the first segment extracted first among the plurality of segments of the outer core is formed in a taper shape having the same width in the peeling direction or extending in the peeling direction. The segments themselves can be easily peeled off without being deformed. Further, when the first segment is extracted from the carbon fiber pipe, the space in which the remaining segment can move is expanded, so that the remaining second segment and third segment can also be extracted in order.

  Furthermore, according to the carbon fiber pipe mold according to the third aspect of the present invention, the outer core can be configured such that all cross sections perpendicular to the longitudinal direction have the same outer shape. According to the above configuration, the mold can be easily removed without using a conventional taper-shaped mold, so that the pipe with the same inner shape can be easily manufactured, and no molding tape is required. It is environmentally friendly and economical.

  Furthermore, according to the carbon fiber pipe mold according to the fourth aspect of the present invention, each of the first inner core and the second inner core is long in one direction and perpendicular to the long direction. The first segment has a rectangular parallelepiped shape in which the cross-sections are the same rectangle, and the bottom surface of the first segment has the same width as one side of the rectangle and contacts the first inner core and the second inner core with the same width. , The side surface is formed vertically from both side edges of the bottom surface toward the top surface, and the second segment has the same shape as the first segment and faces the first segment. The third segment is in contact with the core and the second inner core, and the third segment may be composed of two segments sandwiching the first segment and the second segment from both sides. According to the said structure, after extracting a 1st segment and a 2nd segment, a 3rd segment can be extracted easily. Moreover, the shape of each segment is suitable for processing, and a highly accurate product can be manufactured. Furthermore, since the structure is simple, it can be assembled easily.

  Furthermore, according to the carbon fiber pipe mold according to the fifth aspect of the present invention, it is possible to further include a fixing portion that is attached to both ends from the outside of the outer core and fixes the positions of the plurality of segments. . According to the above configuration, the molding part can be prevented from being deformed by the fixing portion, so that the winding of the carbon fiber sheet is facilitated, and the poor finish due to the molding die being deformed can be improved. . In addition, since a tape for temporary fastening is not required, no dust is produced, and it is environmentally friendly and economical.

  Furthermore, according to the carbon fiber pipe mold according to the sixth aspect of the present invention, the fixing portion can include an insertion hole through which the inner core is extracted in a state of being attached to the outer core. . According to the said structure, while providing the insertion hole in the fixing | fixed part, while being able to adjust the insertion condition of an inner core, an inner core can be removed with the fixing | fixed part attached. In addition, since the inner core can be removed while holding the fixed portion, the burden on the product can be reduced.

  Furthermore, according to the carbon fiber pipe manufacturing method according to the seventh aspect of the present invention, the rod-shaped inner core composed of the first inner core and the second inner core is arranged on the same straight line and is long in one direction. The plurality of long segments surround each of the plurality of segments so that each of the inner cores protrudes outward to form an outer core composed of the plurality of segments, and the position of the outer core is fixed. A step of assembling a carbon fiber pipe mold by fixing both ends of the outer core, and a release material wrapped around the outer core of the assembled carbon fiber pipe mold, and an uncured carbon fiber sheet on the release material A step of thermosetting the uncured carbon fiber sheet to form a carbon fiber pipe, and after thermosetting the carbon fiber sheet, unfixing both ends of the outer core and extracting the inner core The hollow part After form, carbon fiber pipe has cured the heat, a step of extracting by peeling the plurality of segments in the direction of the hollow portion may include a. According to the above configuration, the outer core is composed of a plurality of segments, the hollow portion is formed after the inner core is removed, and each of the plurality of segments can be peeled and moved in the direction of the hollow portion. Can be easily extracted from the pipe. In addition, each segment can be extracted in a state sufficiently separated from the inner surface of the carbon fiber pipe, so that the product can be finished without damaging the product. Further, the inner core is divided into two parts and protrudes from both ends of the outer core to reduce the contact area with the outer core, so that it can be easily extracted from the outer core. Furthermore, by fixing both ends of the outer core, it is possible to prevent the mold from collapsing, so it becomes easy to wind the carbon fiber sheet, and in addition, the mold is deformed, resulting in poor finish. Can be improved.

It is a schematic diagram of the carbon fiber pipe mold according to the present embodiment. It is a model front view which shows the state which removed the fixing part by the side of the 1st inner core of the carbon fiber pipe shaping | molding die concerning this Embodiment. It is an AA 'schematic cross section in FIG. FIG. 3 is a schematic cross-sectional view taken along the line AA ′ in FIG. FIG. 5A is a diagram showing variations in the shape of the carbon fiber pipe and the carbon fiber pipe mold corresponding thereto, and FIG. 5A is a diagram showing an embodiment of the carbon fiber pipe mold for the round pipe-shaped carbon fiber pipe. 5B is a view showing an embodiment of a carbon fiber pipe forming die for a square pipe-like carbon fiber pipe, and FIG. 5C is a carbon fiber pipe forming for the round pipe-like carbon fiber pipe shown in FIG. 5A. It is a figure which shows other embodiment of a type | mold, and FIG. 5D is a figure which shows one Embodiment of the carbon fiber pipe shaping | molding die with respect to a hexagonal pipe-shaped carbon fiber pipe. It is a flowchart which shows the outline of the manufacturing method of the carbon fiber pipe which concerns on this Embodiment. It is a flowchart which shows the shaping | molding die assembly process of the manufacturing method of the carbon fiber pipe which concerns on this Embodiment. It is a flowchart which shows the pipe formation process of the manufacturing method of the carbon fiber pipe which concerns on this Embodiment. It is a flowchart which shows the shaping | molding die extraction process of the manufacturing method of the carbon fiber pipe which concerns on this Embodiment. It is explanatory drawing of the shaping | molding die assembly process of the carbon fiber pipe which concerns on this Embodiment. It is explanatory drawing of the pipe formation process of the carbon fiber pipe which concerns on this Embodiment. It is explanatory drawing of the shaping | molding die extraction process of the carbon fiber pipe which concerns on this Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies the carbon fiber pipe mold 1 and the carbon fiber pipe manufacturing method for embodying the technical idea of the present invention. Not specific. Further, the present specification by no means specifies the members shown in the claims to the members of the embodiments. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in the embodiments are not intended to limit the scope of the present invention unless otherwise specified, and are merely explanations. It is just an example. Note that the size, positional relationship, and the like of the members shown in each drawing may be exaggerated for clarity of explanation. Furthermore, in the following description, the same name and symbol indicate the same or the same members, and detailed description thereof will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing.

In addition, in this specification, the carbon fiber sheet CS (Carbon fiber sheet) is the carbon fiber sheet before curing after the heat treatment, and the carbon fiber pipe CP (Carbon fiber pipe) is the cured carbon fiber pipe after the heat treatment. Describe. Further, the same shape means not only the shape but also the size.
(Configuration of carbon fiber pipe mold 1)

FIG. 1 is a configuration diagram of a carbon fiber pipe mold 1 according to the present embodiment, FIG. 2 is a front view of the carbon fiber pipe mold 1 with the fixing portion 4 on the first inner core 21 side removed, and FIG. 3 is a sectional view taken along the line AA ′, and FIG. 4 is a sectional view taken along the line AA ′ in FIG. 2 of the carbon fiber pipe mold 1 with the inner core 2 removed. As shown in these drawings, the carbon fiber pipe molding die 1 according to the present embodiment is long in one direction and has a first inner core 21 and a second inner core whose cross sections perpendicular to the long direction are the same shape. The inner core 2 is composed of an inner core 2 in which the core 22 is arranged on the same straight line and a plurality of segments that are long in one direction, and the first inner core 21 and the second inner core 22 are protruded outward. The outer core 3 is surrounded, and the fixing unit 4 is attached to both ends from the outer side of the outer core 3 and fixes the positions of a plurality of segments.
(Inner core 2)

  The inner core 2 is composed of a first inner core 21 and a second inner core 22, and supports the end of the outer core 3 from the inner sides of both ends so that the position of the segment constituting the outer core 3 does not move inward. , And after forming the carbon fiber pipe CP, the carbon fiber pipe CP is first extracted. The inner core 2 forms a hollow portion 23 when extracted. By forming the hollow part 23, the outer core 3 extracted after the inner core 2 can be extracted without contacting the carbon fiber pipe CP. Further, by adjusting the length of the inner core 2 to be inserted into the outer core 3 by pulling out a part from the insertion hole 41 before heat treatment, the friction at the time of extraction is reduced, and it is easy to extract from the outer core 3. it can.

As shown in FIGS. 1 to 3, the first inner core 21 and the second inner core 22 are rectangular parallelepiped-shaped metal bars that are elongated in one direction and have the same square shape in cross section perpendicular to the longitudinal direction. It is. When removing the mold from the carbon fiber pipe CP, surface treatment or processing may be performed so that the resistance is reduced. Further, the end portion may be easily inserted into the outer core 3 or the insertion hole 41 by taking a surface or the like. The shape of the inner core 2 is not limited to the above-described shape, and may be any shape that can be inserted into and removed from the end portion of the outer core 3, and can be appropriately selected from a round bar, a prism, and the like. In addition, although the raw material demonstrated on the assumption that metal bars, such as an aluminum alloy, stainless steel, or an invar material, it should just be a raw material which can endure heat processing, and is not restricted to a metal bar.
(Outer core 3)

  The outer core 3 includes a first segment 31, a second segment 32, and a third segment 33 that are equal in length in the longitudinal direction, and the ends of each segment are prevented from moving relative to each other. Are fixed from the inside and the outside by the inner core 2 and the fixing portion 4. The outer core 3 is a member that is used as a mold when the carbon fiber sheet CS is wound, and is taken out after the carbon fiber pipe CP is formed.

  Moreover, although the length in the longitudinal direction of each segment has been described as an example, the length in the longitudinal direction of each segment may not be equal, and the position does not move after the fixing portion 4 is attached. The length of the exposed portion may be longer than the desired length of the pipe. Further, if the length of each segment in the longitudinal direction and the shape of the end portion are changed so as to be fitted in a specific place of the fixed portion 4, it can be prevented from being attached at an incorrect position.

Moreover, the example of the carbon fiber pipe shaping | molding die 1 in case the inner shape of carbon fiber pipe CP differs is shown in FIG. As shown in FIG. 5, the shape of the cross section perpendicular to the longitudinal direction may be the same outer shape as the inner shape of the desired pipe. In addition to the circular shape and the elliptical shape shown in FIG. Such a square, a rectangle as shown in FIG. 5B, or a polygon such as a hexagon as shown in FIG. 5D may be used.
(First segment 31)

  The first segment 31 is a member that is first extracted after the inner core 2 is extracted. As shown in FIG. 1, the first segment 31 is long in one direction and has a cross-sectional shape perpendicular to the long direction. It is a rectangular parallelepiped metal rod having a square shape equal to the cross section.

However, the first segment 31 is not limited to the shape, and as shown in FIG. 5A, the bottom surface has the same width as one side of the inner core 2, and the side surface extends from both ends of the bottom surface to the outer surface (in the claims, “ The shape may be a shape that is vertically formed toward the upper surface.), And, as shown in FIG. 5B, in the cross section perpendicular to the longitudinal direction, the bottom surface is equal to or smaller than the width of one side of the inner core 2. The side surface only needs to be formed perpendicularly or at an acute angle from both side edges of the bottom surface toward the top surface. With this configuration, the inner core 2 can be easily moved in the direction of the hollow portion 23 that is formed when the inner core 2 is extracted, so that it can be easily extracted from the carbon fiber pipe CP with less friction. be able to.
(Second segment 32)

  The second segment 32 is a member extracted second after the inner core 2 is extracted, has the same shape as the first segment 31, and the first inner core 21 and the second segment so as to face the first segment 31. It arrange | positions so that the two inner cores 22 may be contact | connected.

However, the 2nd segment 32 is not restricted to the said shape and arrangement, It can peel and extract from carbon fiber pipe CP after the 1st segment 31 extraction, and the 3rd segment 33 can be extracted after the 2nd segment 32 extraction. For example, as shown in FIG. 5C, the shape other than the first segment 31 of the outer core 3 may be divided into two parts.
(Third segment 33)

  The third segment 33 is a member that forms the outer core 3 integrally with the first segment 31 and the second segment 32 and is extracted after the second segment 32 is extracted.

  As shown in FIG. 1, a rectangular parallelepiped shape in which the shape of the cross section perpendicular to the longitudinal direction is a rectangle composed of a side having the same length as the inner core 2 and a side having a length three times that of the inner core 2. These two metal rods are arranged so as to sandwich the first segment 31 and the second segment 32 from both sides.

  However, the 3rd segment 33 is not restricted to the said shape and arrangement | positioning, What is necessary is just the shape and number which can be peeled in order from the carbon fiber pipe CP after the 2nd segment 32 extraction, for example, as shown in FIG. 5C. The part other than the first segment 31 of the outer core 3 may be divided into two.

In addition, although each raw material of the outer core 3 demonstrated on the assumption that metal bars, such as an aluminum alloy, stainless steel, or an invar material, it is not restricted to a metal bar, What is necessary is just a material which can endure heat processing. The same material as the inner core 2 is preferable.
(Fixed part 4)

  The fixing part 4 is a member that is attached to both ends from the outside of the outer core 3 and fixes the positions of a plurality of segments. In addition, the fixing portion 4 is provided with an insertion hole 41 at a size and a position where the inner core 2 can pass through when the fixing portion 4 is attached to the outer core 3, and the insertion state of the inner core 2 can be adjusted from the insertion hole 41. Can do.

  As shown in FIGS. 1 to 2, the fixing portion 4 is composed of two parts, and the cross-sectional shape perpendicular to the longitudinal direction is a square that is the same shape as the outer core 3. It has a core attaching part 42, and a screw hole 43 is provided on the side surface of the outer core 3 attaching part. By attaching a hexagon bolt 44 to the screw hole 43 from the outside and tightening the hexagon bolt 44, the inserted outer core 3 can be pressed and fixed so as not to move. The insertion hole 41 is provided as a through hole slightly larger than the inner core 2 in the center of the outer core 3 attachment portion.

When manufacturing the pipe with a thin inner shape or the like, if the fixing portion 4 is sized and shaped so that the shape of the end portion can be easily held by hand, the operation of extracting the inner core 2 is easy and there is little fear of damaging the product. The material may be any material that can withstand heat treatment such as aluminum alloy, stainless steel, or Invar material. Moreover, the same material as the inner core 2 and the outer core 3 is preferable from the viewpoint of the expansion coefficient.
(Carbon fiber pipe manufacturing method)

  The flowchart about the outline of the manufacturing method of carbon fiber pipe CP which concerns on this Embodiment is shown in FIG. As shown in this figure, the carbon fiber pipe CP manufacturing method mainly includes a mold assembly process for assembling the carbon fiber pipe mold 1 in step ST101, and an uncured carbon in the carbon fiber pipe mold 1 in step ST102. It consists of a pipe forming step of forming the carbon fiber pipe CP by winding the fiber sheet CS and thermosetting it, and a forming die extracting step of extracting the carbon fiber pipe forming die 1 from the carbon fiber pipe CP in step ST103.

  FIG. 7 is a flowchart of the mold assembly process of the carbon fiber pipe CP manufacturing method according to the present embodiment, FIG. 8 is a flowchart of the pipe molding process, and FIG. 9 is a flowchart of the mold extraction process. Shown in

  Furthermore, FIG. 10 shows a molding die assembly process diagram, FIG. 11 shows a pipe molding process diagram, and FIG. 12 shows a molding die extraction process diagram in the manufacturing process of the carbon fiber pipe CP according to the present embodiment. Hereinafter, the manufacturing method of carbon fiber pipe CP is demonstrated concretely using FIGS.

  First, the process of assembling the carbon fiber pipe mold 1 will be described with reference to FIGS. 7 and 10. First, in step ST201, as shown in FIG. 10A, segments A and B made of an aluminum alloy flat plate (corresponding to an example of “third segment” in the claims) are made of aluminum alloy squares, It arrange | positions so that the segment C (corresponding to an example of the "second segment" in a claim) arranged so that the field which touches inner core 2 may face up may be inserted.

  Next, in step ST202, as shown in FIG. 10B, the first inner core 21 and the second inner core 22 made of aluminum alloy square are arranged on the segment C so that one end protrudes outward. .

  Thereafter, in step ST203, as shown in FIG. 10C, a segment D (corresponding to an example of “first segment” in the claims) made of aluminum alloy square material is arranged on the inner core 2.

  Furthermore, in step ST204, as shown in FIG. 10D, the fixing portion 4 made of an aluminum alloy is fitted into the outer core 3 so that the inner core 2 protrudes outward through the insertion hole 41.

  Next, in step ST205, as shown in FIG. 10E, the degree of insertion of the inner core 2 is adjusted according to the material and shape so that the outer core 3 can be supported without being deformed in the inner direction and the insertion amount is reduced. To do. After the adjustment, in step ST206, as shown in FIG. 10F, the hexagon bolt 44 attached to the screw hole 43 on the side of the fixing portion 4 is tightened and fixed so that the outer core 3 does not move.

  Subsequently, a process of forming the carbon fiber pipe CP will be described based on FIGS. 8 and 11. First, in step ST301, as shown in FIG. 11A, a tape-shaped release material PM (PEELING MEMBER) is wound around the assembled carbon fiber pipe mold 1, and then in step ST302, as shown in FIG. 11B, The uncured carbon fiber sheet CS is wound, and in step ST303, the release material PM is wound from the outside as shown in FIG. 11C.

  As shown in step ST304, the carbon fiber pipe mold 1 around which the uncured carbon fiber sheet CS is wound is placed in an industrial heating furnace at 150 ° C. for 30 minutes (corresponding to an example of “heat treatment” in the claims). ) And thermosetting to form the carbon fiber pipe CP. Since the temperature and time of heat processing change with the kind and thickness of carbon fiber sheet CS, they are not restricted to the above-mentioned time and temperature.

  Finally, based on FIG.9 and FIG.12, the process of extracting the carbon fiber pipe mold 1 from the molded carbon fiber pipe CP will be described. First, after the carbon fiber sheet CS is thermally cured, when the temperature of the carbon fiber pipe CP and the carbon fiber pipe forming die 1 is lowered, as shown in FIG. 12A, the peeling attached to the outside of the carbon fiber pipe CP. Remove material PM.

  Next, in step ST401, as shown in FIG. 12B, the hexagon bolts 44 of the fixing portion 4 that fixed both ends of the outer core 3 are removed.

  In step ST402, as shown in FIG. 12C, the fixing portion 4 is pressed and the first inner core 21 is extracted from the insertion hole 41. Similarly, the second inner core 22 is extracted from the insertion hole 41 at the other end, and the hollow portion 23 is formed.

  After the hollow portion 23 is formed, in step ST403, the fixing portion 4 is removed as shown in FIG. 12D.

  Next, in step ST404, both ends of the segment D in the state of FIG. 12D are struck with a hammer toward the hollow portion 23 (from the top to the bottom in this figure), and as shown in FIG. The fiber pipe CP is peeled off and extracted.

  In step ST405, the upper and lower sides are inverted so that the segment C is arranged on the upper side, and similarly to the segment D, both ends of the segment C are directed toward the hollow portion 23 (from the upper side to the lower side) with a hammer. As shown in FIG. 12F, the segment C is peeled off from the carbon fiber pipe CP.

  Thereafter, in step ST406, the segment B is rotated so that the segment B is disposed on the upper side, and both ends of the segment B are struck with a hammer toward the hollow portion 23 (from the top to the bottom), as shown in FIG. 12G. Thus, the segment B is peeled off from the carbon fiber pipe CP.

  Next, in step ST407, the segment A is rotated so that the segment A is disposed on the top, and both ends of the segment A are struck with a hammer toward the hollow portion 23 (from top to bottom), as shown in FIG. 12H. Thus, the segment A is peeled off from the carbon fiber pipe CP. In this embodiment, the release agent PM wound around the outer periphery of the carbon fiber pipe CP is first removed, and then the inner core 2 and the outer core 3 are removed. However, the inner core 2 remains attached with the release agent PM. Then, the outer core 3 may be removed, and then the release agent PM wound around the outer periphery may be removed. In addition, when it is difficult for the mold to come off the pipe, it is better to strike the pipe from above the covering cloth so that the pipe does not hurt. Further, any one of the segment A and the segment B may be extracted first.

  Finally, in step ST408, as shown in FIG. 12I, the release material PM attached to the inside of the carbon fiber pipe CP is removed to obtain a desired carbon fiber pipe CP.

  As described above, according to the carbon fiber pipe forming die 1 and the carbon fiber pipe manufacturing method according to the present invention, the forming die can be easily formed from the carbon fiber pipe CP after forming without using a tapered forming die. Can be removed. Moreover, the carbon fiber pipe mold 1 according to the present invention can be repeatedly and reused, and can produce the carbon fiber pipe CP efficiently with little waste.

  The carbon fiber pipe mold and the carbon fiber pipe manufacturing method according to the present invention are suitable for forming carbon fiber pipes having the same inner shape. Moreover, the manufactured carbon fiber pipe can be used as an alternative material for the structural material of the assembly tent, which has conventionally used metal materials.

DESCRIPTION OF SYMBOLS 1 ... Carbon fiber pipe shaping | molding die 2 ... Inner core 21 ... First inner core, 22 ... Second inner core, 23 ... Hollow part 3 ... Outer core 31 ... First segment, 32 ... Second segment, 33 ... Third segment 4, 4a, 4b ... fixed part 41 ... insertion hole, 42 ... outer core attaching part, 43 ... screw hole, 44 ... hexagon bolt CP ... carbon fiber pipe CS ... uncured carbon fiber sheet PM ... release material

Claims (7)

A rod-shaped inner core composed of a first inner core and a second inner core;
The inner core is supported by the inner core in a state where the first inner core and the second inner core are arranged on the same straight line, and each of the first inner core and the second inner core protrudes outward. A hollow formed when the inner core is extracted from the carbon fiber pipe after the uncured carbon fiber sheet is wrapped and the carbon fiber sheet is thermoset to form a carbon fiber pipe. An outer core made up of a plurality of segments elongated in one direction, extracted through a section,
Carbon fiber pipe mold with. The carbon fiber pipe mold according to claim 1,
The plurality of segments of the outer core are
After the inner core is removed, the bottom surface is a width equal to or smaller than the width of the inner core when the top surface is a surface forming a part of the outer shape of the outer core in a cross section perpendicular to the longitudinal direction. Is a first segment formed vertically or at an acute angle from both ends of the bottom surface toward the top surface,
A second segment extracted second,
At least one third segment extracted after the second segment is extracted;
Carbon fiber pipe mold with. A carbon fiber pipe mold according to claim 2,
The outer core is a carbon fiber pipe molding die whose cross sections perpendicular to the longitudinal direction have the same outer shape. A carbon fiber pipe mold according to claim 3,
The first inner core and the second inner core each have a rectangular parallelepiped shape that is elongated in one direction and whose cross sections perpendicular to the longitudinal direction are the same rectangle.
The first segment has a bottom surface that is the same width as one side of the rectangle and is in contact with the first inner core and the second inner core with the same width, and the side surfaces are directed from both end sides of the bottom surface toward the upper surface. Vertically formed,
The second segment has the same shape as the first segment, is in contact with the first inner core and the second inner core so as to face the first segment,
The third segment is a carbon fiber pipe mold comprising two segments sandwiching the first segment and the second segment from both sides. The carbon fiber pipe mold according to any one of claims 1 to 4, further comprising:
A carbon fiber pipe molding die provided with fixing portions attached to both ends from the outside of the outer core and fixing positions of the plurality of segments. A carbon fiber pipe mold according to claim 5,
The fixing portion is a carbon fiber pipe forming die provided with an insertion hole through which the inner core is extracted in a state of being attached to the outer core. A rod-shaped inner core composed of a first inner core and a second inner core is arranged on the same straight line, and a plurality of segments elongated in one direction, each of the inner cores from the both ends of the plurality of segments. And assembling a carbon fiber pipe mold by fixing both ends of the outer core so that the position of the outer core is fixed, and forming an outer core consisting of the plurality of segments.
A release material is wound around the outer core of the assembled carbon fiber pipe mold, an uncured carbon fiber sheet is wound on the release material, and the uncured carbon fiber sheet is thermally cured to form a carbon fiber pipe. And a process of
After the carbon fiber sheet is thermoset, the ends of the outer core are unfixed, the inner core is extracted to form a hollow portion, and then the plurality of segments are removed from the thermoset carbon fiber pipe. Peeling it in the direction of the part and extracting it,
A carbon fiber pipe manufacturing method comprising:

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