JP4361148B2 - Manufacturing method of structural member and structural member - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structural member such as a truss member using fiber-reinforced plastic and a method for manufacturing the structural member.
[0002]
[Prior art]
Attempts have been made to produce various structural members such as architectural truss members and space structural members using fiber reinforced plastics. Here, the conventional structural member has a configuration as shown in FIG. 8, and the configuration will be described below together with the manufacturing method of the structural member 1.
[0003]
The structural member 1 has a hollow structural member 2 made of fiber reinforced plastic. As a method of manufacturing the hollow structural member 2, there are a filament winding method, a drawing manufacturing method, and the like.
[0004]
Of these methods, the filament winding method involves immersing a thread-like fiber in an uncured resin so that the fiber contains an uncured resin, and then winding the fiber around an outer periphery of a mandrel (not shown). The uncured resin is cured for a predetermined time such as 1 hour while being heated in an electric furnace.
[0005]
After the uncured resin is cured and the hollow structural member 2 is formed, the mandrel is pulled out from the inside of the hollow structural member 2 or used as the structural member 1 in a state where the mandrel exists (in this figure, (The mandrel has been pulled out.)
[0006]
In addition, the drawing method includes, for example, passing fibers arranged in parallel on the circumference through a die of an extruder, supplying uncured resin to a portion where the fibers are arranged, and heating the resin in the die for a predetermined time. Is cured to form the hollow structural member 2. In this drawing method, since a cylindrical shape or the like can be continuously formed, it is not necessary to pull out the mandrel after forming.
[0007]
In this manner, after the hollow structural member 2 is manufactured, the end joint fitting 3 is attached to the open end of the hollow structural member 2. When attaching the end joint fitting 3, first, holes for driving the rivets 4 are formed in both the opening end side of the hollow structural member 2 and the mandrel fitting portion 3a of the end joint fitting 3. After confirming the alignment of the holes, the rivet 4 is driven. Thereby, the attachment work of the end joint fitting 3 is completed.
[0008]
When the attachment of the end joint fitting 3 is completed, the structural member 1 that can be connected to another structural member via a fitting such as the node 5 is manufactured.
[0009]
[Problems to be solved by the invention]
By the way, the hollow structural member 2 made of fiber-reinforced plastic as described above has high strength and is difficult to perform drilling. This is because fiber reinforced plastic has high strength and contains carbon fiber and aramid fiber depending on the application, so it is difficult to drill and it is only bonded by resin. During the drilling process, cracks along the carbon fiber may occur, making the process difficult.
[0010]
As described above, since the hollow structural member 2 has high strength and is difficult to process, it is necessary to use an expensive tool with good machinability at the time of drilling, but there are several places using such an expensive tool. Drilling holes leads to high costs both in terms of tool costs and increased man-hours during processing. For this reason, the structure of the structural member 1 and the manufacturing method of the structural member 1 which can implement | achieve the coupling | bonding of the hollow structural member 2 and the end joint metal fitting 3 at simple and low cost are desired.
[0011]
Further, the above-described filament winding processing method has a problem that the processing method itself is expensive.
[0012]
The present invention has been made based on the above circumstances, and an object of the present invention is to provide a structural member and a manufacturing method of the structural member that can be reliably coupled with a simple configuration.
[0014]
[Means for Solving the Problems]
According to the first aspect of the present invention, an end joint member is provided at an end portion of the mandrel, and a structure member is formed by winding an uncured fiber-reinforced plastic around the outer peripheral surface of the mandrel including the end joint member. In the member manufacturing method, a fitting step of fitting the end joint member having a protruding portion on an outer peripheral surface into the mandrel, an end joint member fitted by the fitting step, and an uncured fiber-reinforced plastic with respect to the mandrel A fiber reinforcement comprising a winding step for winding and a curing step for curing the fiber-reinforced plastic wound in the winding step, and softening during curing on the outer peripheral surface in the fitting step or the winding step. the pressing member groove for trapping the resin component of the plastic is formed in the end joint member and the shaft, and, overlaid as A method for producing a structural member, characterized in that by Fit the by.
[0016]
The invention according to claim 2 is a structure in which an end joint member is provided at an end of a mandrel, and a structural member is formed by winding uncured fiber reinforced plastic around the outer surface of the mandrel including the end joint member. In the member manufacturing method, a fitting step of fitting the end joint member having a protruding portion on an outer peripheral surface into the mandrel, an end joint member fitted by the fitting step, and an uncured fiber-reinforced plastic with respect to the mandrel a winding step of winding, comprising a curing step of curing the fiber reinforced plastic wound by the winding step, the end portion outer side of the hollow structural member, the said end joint member coaxially and a structural member characterized by push even member is provided to overlap.
[0017]
A third aspect of the present invention is the structural member according to the second aspect, wherein a groove for allowing the uncured fiber-reinforced plastic to escape is formed on the outer peripheral surface of the pressing member.
[0018]
As a result of taking the above-mentioned means, the following operation occurs. According to the first aspect of the present invention, after the end joint member is fitted into the mandrel, when the fiber reinforced plastic is wound around the end joint member and the mandrel and cured, the protruding portion engages with the fiber reinforced plastic. To do. For this reason, even if the fiber reinforced plastic is cured, it is not necessary to perform a drilling process on the fiber reinforced plastic, and the end joint member can be joined only by winding the fiber reinforced plastic. Therefore, processing is easy and the cost is low.
[0019]
According to the inventions of claim 2 and claim 5, even if the resin component of the uncured fiber-reinforced plastic is about to flow from the outer peripheral surface of the mandrel toward the threaded portion of the end joint member during the curing process, Is formed, the resin component accumulates in this portion and does not flow any further. For this reason, the malfunction that the resin component hardens | cures in joining surfaces, such as a thread part of an edge part joint member, can be prevented.
[0020]
According to the invention of claim 3, since the projecting member engages with the inner wall side of the hollow structural member or penetrates the wall surface of the hollow structural member, even if a load such as a tensile force is applied to the end joint member, these The connection between the hollow structural member and the end joint member is not released and is not pulled apart. That is, even if the hollow structure member is not drilled, the hollow structure member and the end joint member are in a combined state.
[0021]
According to the fourth aspect of the present invention, since the pressing member is provided outside the hollow structural member, it is possible to make the structure sufficiently resistant to the compressive load when it is joined to another structural member.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
[0023]
FIG. 1 is a diagram showing a configuration of a structural member 20 configured by combining a hollow structural member 21 as an architectural truss member or a structural member for space and an end joint metal fitting 22, and FIG. FIG. 5 is a view showing a manufacturing method for manufacturing the structural member 20 by joining the hollow structural member 21 and the end joint fitting 22 which is an end joint member.
[0024]
When the structural member 20 is manufactured, as shown in FIG. 2, the end joint fitting 22 is first fitted into a mandrel 23 having an open end and provided in a cylindrical or columnar shape. The mandrel 23 uses, for example, various foam materials, a GFRP drawing material, and the like, and has a length corresponding to the hollow structural member 21 to be molded.
[0025]
Further, as shown in FIG. 7, the end joint metal fitting 22 is configured to have a mandrel fitting part 24 and a prepreg engaging part 25 coaxially with the center line A. The mandrel fitting portion 24 is formed to have an outer diameter corresponding to the inner diameter of the mandrel 23 and can be fitted into the mandrel 23 satisfactorily.
[0026]
The prepreg engaging portion 25 is formed to have a diameter larger than that of the mandrel fitting portion 24, and a protrusion 26 as a protruding member protrudes outward from the outer peripheral surface at a predetermined pitch. The prepreg engaging portion 25 is formed such that the size from the center of the end joint fitting 22 with respect to the outer peripheral surface 25 a where the protrusion 26 does not exist substantially corresponds to the outer diameter of the mandrel 23. . For this reason, the protrusion 26 is provided in a state of protruding outward from the outer diameter of the mandrel 23.
[0027]
In the present embodiment, the prepreg engaging portion 25 is formed in a dodecagonal cross-sectional shape, and the protrusion 26 is formed so as to protrude from the apex portion of the dodecagon. However, the cross-sectional shape of the prepreg engaging portion 25 is not limited to a dodecagon but may be other shapes such as a circle. In addition, the cross-sectional shape of the protrusion 26 is shown as a rectangle in the drawing, but it may be a circular cross-section or an elliptical shape, and the cross-sectional shape may change in the radial direction.
[0028]
An insertion hole 27 is formed at the center of the end joint fitting 22. Through the insertion hole 27, a bolt 28 and a pipe 29 interposed between the bolt 28 and the end fitting 22 are inserted. The bolt 28 is inserted so that the head 28 a is positioned on the inner side of the hollow structural member 21. The pipe 29 is formed so that its entire length substantially corresponds to the sum of the dimensions of the insertion hole 27 and the insertion hole 31 of the presser fitting 30 described later.
[0029]
Thus, after fitting the end fitting 22 into the hollow structural member 21 as shown in FIG. 3, the prepreg which is an uncured fiber reinforced plastic on the outer peripheral surface of the mandrel 23 as shown in FIG. Winding 33. In this case, first, the prepreg 33 is wound around the outer peripheral surface of the mandrel 23, and the prepreg 33 is also wound around the outer peripheral surface 25 a of the prepreg engaging portion 25. That is, the prepreg 33 is not wound around the protrusion 26 until a predetermined stage.
[0030]
Then, after the outer peripheral surface of the wound prepreg 33 is formed at a predetermined height, the prepreg 33 is also wound on the protruding end portion side of the protrusion 26. Next, as shown in FIG. 4, a pressing metal member 30 as a pressing member is attached so as to overlap the end joint metal fitting 22. The presser fitting 30 also has an insertion hole 31 at its center. For this reason, the bolt 28 and the pipe 29 are inserted into the insertion hole 31 and temporarily fixed using, for example, a nut 34. The pressing metal 30 is formed in a pulley shape having a groove 32 on the outer peripheral surface.
[0031]
After inserting the presser fitting 30 into the bolt 28, the prepreg 33 is wound around the mandrel 23, the prepreg engaging portion 25 and the entire presser fitting 30, and as a result, in the vicinity of the end joint fitting 22. Then, the prepreg 33 exists as shown in FIG.
[0032]
After the winding of the prepreg 33 is completed, the prepreg 33 is cured by heating. As a result, the wound prepreg 33 is integrally cured to form the hollow structural member 21. In addition, you may form the hollow structure member 21 by normal temperature hardening, without making it heat-harden. In the case of room temperature curing, although it takes longer to cure than heat curing, integral curing can be realized in the same manner as heat curing.
[0033]
Here, when the prepreg 33 is heat-cured, the uncured resin existing in the prepreg 33 is temporarily softened to flow toward the insertion hole 27 (bolt 28) along the joint surface of the end joint fitting 22. Sometimes. If the uncured resin flows into the bolt 28 and hardens, there is a problem that the bolt 28 cannot be screwed in. Therefore, the press fitting 30 having the groove 32 formed on the end joint fitting 22 is closely attached. Install.
[0034]
Then, even if the uncured resin flows from the outer peripheral surface side of the mandrel 23 toward the end joint fitting 22, the uncured resin flows into the groove 32 of the presser fitting 30, and the uncured resin is trapped in the groove 32. (Trap; escaped, caught) and not heading toward the bolt 28. That is, the groove 32 serves as a resin trap.
[0035]
Then, after the prepreg 33 is cured, a node (not shown) is screwed onto the bolt 28 and attached, and other components such as other hollow structural members are attached to the node. Thereby, a truss structure, a structural member for space, and the like can be easily created.
[0036]
In addition, after the prepreg 33 is cured and the hollow structural member 21 is formed, the mandrel 23 is left inside the hollow structural member 21 even if the mandrel 23 is pulled out from the hollow structural member 21. (In this embodiment, the mandrel 23 remains as shown in FIG. 1).
[0037]
According to the structural member 20 and the manufacturing method of the structural member 20 as described above, the end joint fitting 22 is fitted into the mandrel 23, and then the prepreg 33 is wound and cured, so that the protrusion 26 has a hollow structure. Engage with the inner wall surface of the member 21. That is, the hollow structure member 21 and the end joint fitting 22 can be coupled only by winding the prepreg 33 and curing it.
[0038]
For this reason, it is not necessary to drill the hollow structure member 21, the cause of cost can be eliminated, and cost reduction can be realized.
[0039]
Moreover, since the structure in which the hollow structural member 21 and the end joint fitting 22 are coupled can be manufactured simply by winding the prepreg 33, it is easy to manufacture a coupled structure in which these are coupled.
[0040]
Further, since the presser fitting 30 is attached to the end joint fitting 22 in an overlapping manner, even if a compressive load is applied from the node to the structural member 20, the presser fitting 30 uniformly transmits this force to the hollow structural member 21. Therefore, the load that the structural member 20 can withstand is increased as compared with the case where the presser fitting 30 is not provided.
[0041]
Further, since the presser fitting 30 is provided and the groove 30 is formed in the presser fitting 22, the uncured resin contained in the prepreg 33 flows toward the joint surface of the end joint fitting 22. Can be prevented. That is, the presser fitting 30 is provided so as to overlap the end joint fitting 22, and even if uncured resin flows out, it enters the groove 32 and is trapped in the groove 32.
[0042]
For this reason, it is possible to prevent a problem that uncured resin adheres to the bolt 28 and is cured and supported by screwing of the bolt 28.
[0043]
In addition, after the end joint fitting 22 is fitted into the mandrel 23, the prepreg 33 is first wound around the mandrel 23 and the end joint fitting 22 where the protrusions 26 do not exist. The hollow structure member 21 is free from gaps, and a dense structure with high strength can be manufactured. That is, first, if the prepreg 33 is wound from a portion of the end fitting 22 where the projection 26 does not exist, a configuration in which the projection 26 and the prepreg 33 are satisfactorily engaged can be manufactured.
[0044]
Although one embodiment of the present invention has been described above, the present invention can be variously modified in addition to this. This is described below.
[0045]
In the above-described embodiment, the hollow structure member 21 is described as having a cylindrical shape. However, the hollow structure member 21 is not limited to a cylindrical shape, and may be formed in other shapes such as a rectangular tube shape.
[0046]
Moreover, in the said embodiment, although the hollow structure member 21 is manufactured using the prepreg 33, the fiber-like fiber immersed in uncured resin other than the prepreg 33 is arranged along the longitudinal direction of the mandrel 23, for example. Alternatively, the hollow structural member 21 may be manufactured by winding it around the mandrel 23 and curing it.
[0047]
Further, the shape and pitch of the protrusions 26 can be variously changed.
[0048]
In addition, various modifications can be made without departing from the scope of the present invention.
[0049]
【The invention's effect】
As described above, according to the first aspect of the present invention, since the projecting portion engages with the fiber reinforced plastic, even if the fiber reinforced plastic is cured, there is no need to perform drilling processing on the fiber reinforced plastic. The end joint member can be joined only by winding the reinforcing plastic. Therefore, processing is easy and the cost is low.
[0050]
According to the second and fifth aspects of the present invention, since the softened resin component is trapped in the groove portion during the curing step, the resin component is cured at the joint surface of the end joint member during the curing step. Can be prevented.
[0051]
According to the third aspect of the present invention, the hollow structural member and the end joint member can be combined with each other without drilling the hollow structural member.
[0052]
According to the fourth aspect of the present invention, since the pressing member is provided, it is possible to make the structure sufficiently resistant to the compression load when it is joined to another structural member.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a configuration of a structural member according to an embodiment of the present invention.
FIG. 2 is a view showing a manufacturing method of the structural member according to the embodiment, and is a view showing a state in which the end fitting metal fitting is fitted into the mandrel.
FIG. 3 is a view showing a manufacturing method of the structural member according to the embodiment, and is a view showing a state in which an end joint fitting is fitted in the mandrel.
FIG. 4 is a view showing a state in which the presser fitting is overlapped and fitted into the end joint fitting according to the embodiment.
FIG. 5 is a view showing a state where a prepreg is wound around the mandrel and the end joint fitting according to the embodiment;
FIG. 6 is a partial cross-sectional view showing a state in the vicinity of an end joint fitting and a press fitting joining portion according to the embodiment.
7A and 7B are diagrams showing the shape of the end fitting according to the embodiment, where FIG. 7A is a side sectional view, and FIG. 7B is a front view.
FIG. 8 is a side sectional view showing a configuration of a conventional structural member.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 20 ... Structural member 21 ... Hollow structural member 22 ... End joint metal fitting 23 ... Mandrel 26 ... Protrusion 28 ... Bolt 30 ... Holding metal fitting 32 ... Groove part 33 ... Prepreg

Claims (3)

In the manufacturing method of the structural member, the end joint member is provided at the end of the mandrel, and the uncured fiber reinforced plastic is wound around the outer peripheral surface of the mandrel including the end joint member to form the structural member.
A fitting step of fitting the end joint member having a protruding portion on the outer peripheral surface into the mandrel;
A winding step of winding an uncured fiber reinforced plastic around the end joint member and the mandrel fitted by the fitting step;
A curing step of curing the fiber-reinforced plastic wound by the winding step,
The fitting process or in a winding process, the pressing member groove which traps the resin component is formed of softened fiber-reinforced plastic on the end joint member and the shaft during cure on the outer peripheral surface, and to superimpose them method of manufacturing a structural member, characterized in Installing put it Te. In a structural member formed by winding uncured fiber reinforced plastic around a mandrel,
A hollow structural member formed by curing the fiber reinforced plastic wound around the mandrel, and provided on the opening end side of the hollow structural member and engaged with the inner wall side of the hollow structural member on the outer peripheral surface; or An end joint member having a protruding portion passing therethrough,
Said hollow structure end outer side of the member, the said end joint member coaxially and structural member, characterized in that push even member is provided to overlap.   3. The structural member according to claim 2, wherein a groove for trapping the resin component of the fiber reinforced plastic softened during curing is formed on the outer peripheral surface of the pressing member.

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