JPH05237569A - Partition wall structural pipe and method for forming the same - Google Patents

Abstract

PURPOSE:To provide a structural material improving the bending rigidity and the twisting rigidity of a pipe and reducing in weight and having high rigidity as much as possible. CONSTITUTION:The metallic pipe 13 is drawn by a die 11 and a mandrel 12, and during drawing, the mandrel 12 is retreated, and into the formed pipe 3, a metallic plate 14 being a partition wall is pressed. After pressing in, again the metallic pipe 13 is drawn and the metallic plate 14 is inserted successively. By the drawing work, the metallic pipe 13 generates plastic deformation to form the new surface and this pipe is joined with the pressed-in metallic plate 14 in solid phase, and the partition wall structural pipe having the integral structure is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe, and more particularly to a partition structure pipe having an integral structure in which a partition is provided in the inner space of the pipe and a molding method thereof.

[0002]

2. Description of the Related Art Metal pipes and pipes made of a reinforced composite material of carbon fiber or the like and resin are used in a wide range of fields such as vehicles, aircraft and exercise equipment because of their high compressive strength. Although these tubes are required to be lightweight and have high rigidity, there is a limit to weight reduction because they have lower bending rigidity and torsional rigidity than compression rigidity. As a method of improving the bending rigidity and the torsional rigidity, there is known a method in which an axial rib is formed on the inner surface of the pipe, but the merit of improving the rigidity against the demerit of increasing the weight is small.

As a means for effectively improving the bending rigidity and the torsional rigidity of the pipe, it is conceivable to provide a partition wall as seen in bamboo knots, but at the time of drawing a metal pipe or heat-forming a composite material pipe. There is no processing method for forming the partition wall in the tube body, and a tube in which the partition wall is integrally formed in the hollow portion of the tube has not been realized.

[0004]

Although it has been conventionally desired to develop a structural member that is as lightweight and highly rigid as possible, a tube as a lightweight structural member is required to have bending rigidity and torsional rigidity as compared with compressive strength. There is a problem that is low. Therefore, an object of the present invention is to provide a method of improving bending rigidity and torsional rigidity of a pipe, enabling a further lightweight structure, and realizing its molding.

[0005]

DISCLOSURE OF THE INVENTION The present invention is proposed in order to achieve the above-mentioned object, and is an integral structure partition wall in which a partition wall orthogonal to the axis is provided in a hollow tube made of metal or fiber composite material. Structural tube, and the metal tube is drawn by a die and a mandrel, the mandrel is retracted during the drawing process to insert a metal plate serving as a partition into the metal tube, and the metal tube is drawn to separate the metal plate and the metal tube. A method for forming a partition structure pipe to be solid-phase joined, and a hollow cylindrical core is covered and covered with a fiber-reinforced composite material such as carbon fiber or glass fiber using a thermoplastic resin as a filling resin. Another object of the present invention is to provide a method for molding a partition wall structure tube in which a plurality of cores are inserted into a mold, the end surfaces of the cores are brought into contact with each other and heated, and the outer cylinder portion and the partition wall are integrally molded.

[0006]

According to the first aspect of the present invention, since the partition wall orthogonal to the axial center of the pipe receives bending stress and torsional stress, bending rigidity and torsional rigidity are improved as compared with a hollow tube having the same wall thickness. According to the second aspect of the invention, the metal plate inserted during the drawing process of the metal pipe is pressed against the metal pipe, and the metal pipe and the metal plate are solid-phase joined by this pressure and the temperature rise due to plastic deformation during the drawing. Unify.

According to a third aspect of the present invention, when a plurality of cores coated with a composite material fiber or a yarn mixed with a thermoplastic material are housed in a mold and subjected to heat treatment, they abut each other. The composite material on the end face of the core is fused to form a partition wall,
In addition, a tube in which the outer cylinder portion and the partition wall are integrated is formed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a partition structure pipe according to claim 1, (a)
Is a straight partition wall structure pipe 1 made of metal or fiber reinforced composite material, and the partition walls 2, 2 ... Arranged at equal intervals are joined to the inner surface of the pipe 3. (B) is a partition structure pipe 4 in which the intervals between the partitions 2, 2 ... Are unequal, and the distribution of the rigidity (E.I) and the torsional rigidity (G.I) can be set arbitrarily by the distribution of the intervals. it can. Therefore, it is possible to control the flexural distribution in the longitudinal direction as a beam member, and to meet the flexural distribution requirements of fishing rods, golf club shafts, and the like. (C) is
The metal partition wall structure tube having the shape shown in (a) is swaged to form a tapered partition wall structure tube 5. Also, (d) is a tapered partition wall structure tube 6 made of a composite material and having a constant wall thickness.

Next, the molding method according to claim 2 will be described in detail with reference to FIGS. In FIG. 2, reference numeral 11 is a die, and 12 is a mandrel. Drawing hole 1 of die 11
When the tip of the metal pipe 13 is press-fitted into the metal pipe 1a, the mandrel 12 is inserted into the metal pipe 13 from the rear side, and the mandrel 12 is pushed toward the throttle hole 11a of the die 11 while the metal pipe 13 is pulled out forward, the die 11 The formed pipe 3 having the hole diameter of is drawn out. Then, the withdrawal is interrupted, and the mandrel 12
And the metal plate 14 having a diameter slightly larger than the inner diameter of the forming pipe 3 is press-fitted from the rear as shown in FIG. The insertion means of the metal plate 14 is performed by providing a suction means on the mandrel 12 or by using another insertion tool. At the time of this insertion, the pipe 3 is squeezed by a die, undergoes plastic deformation and generates heat, and a new surface is formed on the contact surface with the metal plate 14.

After the metal plate 14 is press-fitted into the new surface, as shown in FIG. 4, when the drawing is resumed, the new surface, in which the movement of electrons and the like is activated by heat, is solid-phase bonded by the pressure. Then, after pulling out a certain distance, by performing the press-fitting operation of the metal plate 14 described above, the partition walls can be formed at arbitrary intervals. After the drawing process is completed, the created partition wall structure tube is subjected to an annealing process for removing strain, and at this time, the recrystallization temperature of the material of the tube (for example, in the case of iron Fe, about 600 to 650 ° C) is applied. By heating until reaching, the diffusion bonding of the joint portion between the pipe 3 and the metal plate 14 is promoted, the boundary disappears, and the joint is further integrated.

Obviously, the partition walls can be arranged at equal intervals, but as shown in FIG. 1 (b), the space where the stress is expected to be concentrated depending on the purpose of use of the pipe is the interval between the partition walls 2, 2. The distribution of bending rigidity, torsional rigidity, and natural vibration mode can be set arbitrarily, for example, by increasing the density. Further, as the shape of the metal plate 14 to be the partition walls 2, 2, ..., As shown in FIG. 5, various shapes such as a disk (A), a ring shape (B), and a spoke shape (C) can be used. Although not shown, the cross-sectional shape of the tube 3 is not limited to a circular shape, and it is natural that a rectangular cross-section or the like can be formed.

Next, an embodiment of the invention described in claim 3 will be described. This invention is to manufacture a tube having a partition wall by using a reinforced composite material of carbon fiber or glass fiber. Figure 6
Shows a core 21 for forming a tube, which is a hollow cylinder made of a thermoplastic resin. The core 21 is covered with a prepreg molding yarn 22 in which carbon fiber or glass fiber is impregnated with a filling resin to cover the entire core 21. Polyether ether ketone (PE
EK), polyphenylene sulfide (PPS), nylon 66, or other thermoplastic resin is used.

Then, as shown in FIG. 7, the molding yarn 2
The cores 21, 21 ... Covered with 2 are sequentially inserted into the molding frame 23, and the end faces are brought into contact with each other to heat the cores 21,
The air inside 21 is heated and the cores 21, 21 ... Expand. As a result, the molding yarn 22 is brought into close contact with the inner surface of the molding frame 23, and the end surfaces of the cores 21, 21 ... Are welded to form a partition wall tube of composite material having a predetermined outer diameter.

The core 24 shown in FIG. 8 has holes 25,
25 is opened. The holes 2 are formed along the shape of the core 24.
The portions other than 5, 25 are covered with the molding yarn 22, and
It is inserted into the molding frame 23 shown in FIG. And the molding form 2
Air or gas is introduced from the outside of 3 through the injection port 26, and internal pressure is applied to the cores 24, 24, ... To heat the cores, thereby forming a tube having a ring-shaped partition wall.

The tapered tube 7 shown in FIG. 1D is shown in FIG.
Are manufactured by the tapered cores 27, 27 ... And the tapered form (not shown). Further, a plurality of cores coated with the molding yarn are entirely coated with the composite material to form an integral tube shape, which is housed in the molding frame shown in FIG. 7 and heat-treated to further improve the rigidity. be able to.

The present invention can be modified in various ways without departing from the spirit of the invention, and it goes without saying that the invention covers such modifications.

[0017]

Since the present invention is constructed as described in detail in the above one embodiment, the rigidity against bending and twisting of the pipe is remarkably improved. As a result, the pipe can be made thin and the weight can be reduced as much as possible, and various structures can be made lightweight. In addition, since the distribution of flexural rigidity and torsional rigidity and the vibration mode can be set arbitrarily, it is possible to respond to the demands such as the bending of the fishing rod and the shaft of a golf club, the bending of the hand, and the control of the bending distribution of the beam members. It is an invention that enables structural innovation in a wide range of fields.

[Brief description of drawings]

1 shows a partition structure pipe according to claim 1, wherein (a) is a sectional view of a straight type equally spaced partition structure pipe, (b) is a sectional view of a straight unequally spaced partition structure pipe, and (c) is FIG. 3D is a cross-sectional view of a tapered partition wall structure metal tube, and FIG. 3D is a cross-sectional view of a tapered partition wall structure composite material tube.

FIG. 2 is an explanatory view showing a molding procedure of the partition wall structure metal tube according to claim 2;

FIG. 3 is a second explanatory view showing the molding procedure according to claim 2.

FIG. 4 is an explanatory diagram showing a molding procedure according to claim 2 of the present invention.

FIG. 5 is a front view of a metal plate serving as a partition of the partition structure metal tube according to claim 2, wherein (a) is a disk shape, (b) is a ring shape, and (c) is a spoke shape.

FIG. 6 is a cross-sectional view of a core used in the molding method according to claim 3;

FIG. 7 is an explanatory view of a molding frame showing the molding method according to claim 3.

FIG. 8 is a sectional view of a core used in the molding method according to claim 3;

FIG. 9 is a cross-sectional view of a core used in the molding method according to claim 3;

[Explanation of symbols]

 1,4,5,6 Bulkhead structure tube 2 Bulkhead 3 tube 11 Die 12 Mandrel 13 Material tube 14 Metal plate 21,24,27 Core 22 Molding yarn 23 Molding form

Claims (3)

[Claims] 1. A partition wall structure tube having an integral structure in which a partition wall orthogonal to the axis is provided in a hollow tube made of metal or fiber composite material. 2. A metal tube is drawn out by a die and a mandrel, the mandrel is retracted during drawing, a metal plate serving as a partition is inserted into the metal tube, and the metal tube is drawn out to separate the metal plate and the metal tube. A method for forming a partition structure pipe in which solid phase bonding is performed. 3. A hollow cylindrical core is covered with a fiber-reinforced composite material such as carbon fiber or glass fiber containing a thermoplastic resin as a filling resin to cover the entire peripheral surface and the end surface of the hollow cylindrical core. A method for forming a partition wall structure tube, wherein the outer cylinder part and the partition wall are integrally molded by inserting the core into contact with each other and bringing the end faces of the cores into contact with each other and heating.