JPS63166520A - Manufacture of composite material pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing hollow tubular connections from a type of composite material. This method is new and unprecedented, and involves prepreg material (impregnated material) composed of a resin and reinforcing fibers, such as reinforcing fibers, by stacking a number of layers according to a designed stacking angle and order. The resin 'C is impregnated in advance.
e) The material to be made is wrapped around the core. It is wrapped in a very dry fiber cloth, and if it is heated under pressure from the outer periphery to the center or from the center to the outside, the penetrating layer on the back side is heated. Under the pressure, the resin contained in the material oozes out due to heat flow and is absorbed by the dry fiber MHI mentioned above.Therefore, the inner layer and the outer layer are combined and integrated. Then,
Finally, it hardens into a molded product. The hollow tubular joints made in this way have a fabric-like appearance with various flower patterns and the shape of a heart-shaped part. be.

As mentioned above, the present invention relates to a new method for making tubular objects from composite materials, namely a method for making hollow tubular connections from composite materials. The composite material used therein is composed of resin and reinforcing fibers. In traditional examples of making composite tubular joints from continuous reinforcing fibers and resin, these methods involve infiltrating the reinforcing fibers into a liquid resin.
A strip or strip having a width of several inches to several tens of inches is cut into strips and then directly coated in a metal bar-shaped 8-lamp shape, or wrapped around -1=ll and heated under pressure from the outside. Mix the resins together. After they harden into a monolith-like mold, the impregnated material is wrapped layer by layer into a tube, placed inside an 8m mold, and subjected to high pressure from the inside of the tube. The air-impregnated material is firmly attached to the hollow part of the mold and allowed to harden into a mold, resulting in a tubular article. U.S. Patent Nos. 4511523@ and 43
No. 89269@ and U.S. Pat. No. 4,528,060@ discloses another method of manufacturing a composite material in which resin-impregnated fibers are bundled and raised.

The resin is then cured at the same time as it passes through the mold.

All the tubular joints produced by the conventional method have no coloring or flower pattern, and their appearance has not changed since the application. If you want a product with a flower-patterned appearance, you have to go through a complicated infiltration process, which is expensive, and you have a lot of choice.

The present invention is a method of making a tubular object from a composite material, and the method includes using (+)erpreg which has already been infiltrated.
) Coat the material, ie, the impregnated material, into a rod-shaped mold 6. The outer layers are encased in fibers that have not been infiltrated by the dry resin, and sufficient heat and pressure applied from the outer periphery to the center or from the center outward will cause the layers on the back to be infiltrated. The resin contained in the material and the am fabric covered by the outer layer combine to become a single body. That is, the action of pressure causes the resin to ooze out and become absorbed by the All fabric, and the action of heat causes the resin to react and harden. The effect of this heat is to shrink the hardened tape, and at the same time, the mold 6 expands due to the heat, which means that it contracts or expands due to the heat, creating pressure, and hardens to form the mold. After that, it begins to have a flower pattern similar to that of the outer layer, and becomes a tubular object that also has a heart-shaped shape.

The main purpose of the present invention is to provide a new method that has never been seen before by making a tubular object using a type of composite material. The advantages of this method are as follows.

(1) A molded article made based on the method according to the present invention has a flower pattern in its appearance, and the type of flower pattern can be changed as necessary.

■ Since the fiber fabric in the outer layer of the tubular article made according to the present invention is bonded as a net i, the unidirectional fibers in the back layer
on fiber) and protects them. Therefore, its impact resistance is increased, and even if it ruptures, the fibers in the back layer will not cause harm to people.

■ There is no need to go through the complicated process of impregnating the fiber fabric on the surface with resin, which reduces costs and shortens the time required for manufacturing.

(4) The inner and outer surfaces of the product are flat and smooth, and the method of making them so is extremely precise and easy to control.

its bond strength (adhesive bond)
5tr (3n!7th) can be made higher.

■ The finished product has a variety of shapes. Examples include common circular tubes, square tubes, polygonal tubes with an average cross section, or hollow connections with a simple variable cross section.

A non-limiting concrete example according to the invention will be explained based on the drawings.

According to the present invention, first, the angle at which the fibers are arranged and the order in which they are stacked are determined based on the bundle of stress tests. The infiltrated material is cut into desired dimensions. The impregnated material used is a resin-impregnated single oriented fiber (UnidireCtiOn fiber).
or a knitted material.

These single oriented fibers and braids are made from carbon MA fibers, glass fibers, Keplerian fibers or mixtures thereof. Suitable resins for use include epoxies, unsaturated polyesters, polyvinyl esters, phenolic resins, or polymide resins.

The ratio of the volume occupied by the resin to the impregnated material is about 40-60%. Appropriately cut impregnated material 11 is stacked and rolled into a tubular shape as shown in FIGS. 1 and 2. The optional portion 12 may be a plastic tube 42 closed at one end (see FIG. 5). For example, nylon pipe, cellophane, or high thermal expansion coefficient (high thermal expansion coefficient)
A silicone rubber or Teflon rod with high bulk modulus. Alternatively, the rod 22 (metal rod) has a surface treated with a thin film.
coated with the releaseag
ent) can also be used as a necessity (see Figure 3).

The exterior of the tubular impregnated material is covered with a layer of non-resin impregnated fiber fabric 13,14.

These fiber fabrics are woven fabrics.
c), Meri 4+y Su (knitted fabric
), or braided fabric
) etc. The constituent materials of the fabric include carbon mH, glass fiber, and Kevlar fiber (Du Pont).
Co, products), dyed organic fibers or the above! such as a mixture of lH.

Since these W&fiber fabrics do not require prior treatment to impregnate with resin, the resin gamma impregnation process can be omitted, reducing costs and time required. The flower pattern, color and shape of the textile fabric can be arbitrarily selected according to needs, and the molded product is therefore characterized by beautiful appearance and versatility.

As shown in FIG. 3, a steel rod 22 is necessarily used. The rod is covered with an impregnated material 21, the surface of which is further covered with a fiber fabric 23, and then a heat-shrinkable tape or tube 24, such as an OPP membrane (Orient
ed po+ypropy+cnc) or Tcd f
Cover with an ar pipe (product of Nu Pont Co.) or wrap with film. It is then heated in a hot air box so that the plastic tape or tube contracts due to the heat and the impregnated material exerts pressure on the tube framework inwardly, causing the resin contained in the impregnated material to release. In response to this heat and the pressure saw, it moves outward and is attracted to the dry mm fabric in its outer layer. After the resin is cured, the impregnated material in the inner layer and the mMLn material in the outer layer are bonded together.

After stripping off the outer layer of plastic tape or tubing, a hydraulic press pumps out the steel material to form a tube with a floral appearance.

As in No. 1 FA 7R, if a rod-shaped material 32 with a high coefficient of thermal expansion and a high volume coefficient is used as the center of the impregnated material 31, a hollow metal mold plate 51 in the form of a cylinder is used as the mold 50 of the outer layer. . The tube framework 30 with silima material 33 impregnated therein is placed in the hollow template. This mass is heated to such an extent that the resin hardens, and its inevitable thermal expansion creates an outward pressure. The pressure value is the inevitable coefficient of thermal expansion,
The product of the total volume coefficient and the heated temperature is directly proportional to the volume. The resin contained in the impregnated material flows outward and is adsorbed to the dry fiber fabric in the outer layer, and after the resin hardens, the impregnated material in the inner layer and the 4a fiber fabric in the outer layer are combined. are combined to form a hollow tubular molded product. After the template is cooled to the air temperature, the template first expands due to heat and then cools and contracts, creating a gap between the template and the molded product, which makes it easy to create a concentric mold. Start to slide. This necessity can be used repeatedly for the next task.

As shown in FIG. 5, a plastic tube 42 with one end closed is used as the center of the impregnated material, and a hollow metal template formed in the same shape as the molded product is used as the outer template. cormorant. 41 A tube framework 40 of impregnated material covered with textile fabric 43 is placed in the hollow of the template. After these templates are combined, a sufficiently high pressure gas 44 is blown into the open end 44 of the plastic tube. The plastic tube then takes the form of a bag and becomes a source of pressure, exerting pressure outwards on the impregnated material. The magnitude of this pressure is determined by the pressure of the air blown into it. When the resin contained within the impregnated material is subjected to pressure and heat, it flows outward, where it dries in the outer layer! It is absorbed into the textile fabric and becomes a hollow molded product after the resin hardens.

The hollow tubular composite made using the present invention has a beautiful flower pattern in appearance. Using the dried II fabric, it absorbs the resin contained in the impregnated material on the back layer, and after hardening, it is bonded into a single piece. The complicated process of impregnating the fiber fabric with resin can therefore be omitted.

At the same time, the variety of fiber fabrics that can be used in the method of the invention is much greater than with the prior art. Therefore, molded articles made according to the method of the present invention are less expensive and more versatile.

The method of the invention has wide application in making hollow tubular composites of various types. Examples include bicycle frame parts, fishing equipment, tennis rackets, badminton rackets, and golf clubs.

Example 1: Carbon fiber/epoxy resin cured under 250° The arrangement as a stacking angle of a single bundt orientation is (02/
45/ O/ 45/ O/45/ O/ 451
0) Cut the impregnated material, which is S, according to the required dimensions of the overlap, wrap it repeatedly around a round TEFLON rod with a length of 500 MM between 251 fφ, and then wrap it in a resin of 91 MM x 500 MM. A plain weave fabric of unimpregnated carbon tJA shroud is cut and wrapped around the outer layer of impregnated material, and then the tube is placed in a hollow cut metal template.

Fit the templates and heat to below 300°C for - hours. Do not open the template after it has cooled and remove the molded product after it has hardened. Since the Teflon core mold expands due to heat and then contracts when cooled, a gap is created between mold 6 and the molded product. Because of this, the mold 6 easily slides out of the circular tube as a molded product, so it can be used repeatedly.

Cut off any fin-like burrs or spills from both ends of this molded product.

The result is a hollow circular tube of composite material with a floral pattern on the fabric.

A test was conducted on overlapping joints of circular pipes with an outer diameter of 30φm (0, D, ). This circular tube was bonded to an aluminum vibrator with an inner diameter of 30.5φ using Giba-Geigy's room temperature curing adhesive. The length of the bond was 1 inch. As a result, the strength of tA cleavage obtained was 245 Kg/CR2. Moshi Carbon 41i
1. When used for bonding, a circular tube made of a single oriented impregnated material not coated with fabric was used.

Therefore, the flower pattern on the fabric covered by the outer layer was able to increase the strength of the adhesive when applied to adhesives.

Example 2 Carbon hardened with 250 pieces! 111t/epoxy resin unidirectional impregnated material whose stacking angle arrangement is (02/4510/, -45/O/451
0/ -43/ O) Using an impregnated material of s, the cutting height is 400 m, and the top and bottom sides are each 1
It is a trapezoidal impregnated material with a diameter of 0 and 44s. The top and bottom sides may increase or decrease slightly depending on the needs of each layer. One end of it is closed with a knot.

A thin nylon tube with a length between 2.5 mm and 430 mm is placed on the edge of the impregnated material and centered. Then, according to the angle of the pleats and the order of stacking, stack and stack the nylon tubes. The outer layer of the impregnated material is then braided with 64 bundles 3 of carbon ms, and a braided tube with a length of 410 m, which has not been previously impregnated with resin, is wrapped around the outer surface of the impregnated material.

This is then placed in the oval conical cavity of a metal template and the template is heated to below 300℃. High pressure air of 9/α2 is blown into 10 from one end of the opening of the nylon tube. After one hour, the template cools down, and the template is opened to remove the molded product. Cut off any fin-like burrs or spills from both ends of this molded product. A hollow oval conical tube of composite material with a fabric flower pattern is then obtained.

Example 3: Using carbon fiber lit/epoxy resin single oriented impregnated material cured under 250°C, its pleat angle and stacking order are (02/45/0/-45/
It is a trapezoidal impregnated material using an impregnated material of 0/45/O/-4510)s, the cutting height of which is SOO, and the upper and lower bases of which are 51#W and 37#lI, respectively. The top and bottom sides may increase or decrease slightly depending on the needs of each layer. The impregnated material is then helically wrapped around an elliptical conical metallic inner rod that has been subjected to a layering and film shedding surface treatment, according to the angle of the pleats and the stacking order. The outer layer of the impregnated material is then braided with 48-bundle 3 carbon fibers and a braided tube having a length of 50 #ll, which has not been pre-impregnated with resin, is wrapped around the outer surface of the impregnated material. and then oriented polypropylene (Orient) with a width of 15
ed polypro-pylene) is wrapped around the outer surface of the braided tube.

Place the template in a hot air box and heat to below 300℃ for one hour. After cooling, the outer layer of expanded polypropylene is peeled off, the core is hardened using a hydraulic core-stripping device, and the core is removed from the composite tube. By cutting off the fin-like serrations at both ends and polishing the surface to give it a glossy finish, it becomes a hollow elliptical conical tube of composite material with a flower pattern of fabric.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a composite hollow tube, and Figure 2 is a tube framework (prel) made of permeable material. Jtubul
Figures 3 to 5 each show five products based on the manufacturing method according to the present invention, and Figure 6 shows Figures 4 and 5, respectively. 5
FIG. 3 shows a template corresponding to the product shown in FIGS. 11.21.31... Penetration material, 12.32.
Old... Core shape, 13.14, 23.43... Fiber fabric, 22... Steel rod, 24... Tape or tube, 33... Fiber fabric, 30, 40...
... Pipe frame, 42 ... Plastic deck pipe, 44 ... One end of plastic pipe 50 ... Outer layer mold, 51 ... Metal template .

Claims (10)

[Claims] (1) A method of making a hollow tubular composite using a composite material, which involves wrapping the impregnated material around the core according to the designed fold angle and stacking order arrangement, and the outer layer is covered with dried fiber cloth,
The resin contained in the impregnated material of the backing layer is heated by applying sufficient pressure from a suitable pressure source inwardly from the periphery or outwardly from the center. A method of manufacturing a composite material tube which flows outwards and oozes out and is absorbed into the aforementioned dried fiber fabric, so that the backing layer and the outer layer are bonded together and finally hardened into a molded article. (2) The impregnated material is a pre-impregnated, single oriented or knitted fabric.
A method for manufacturing a composite material pipe as described in Section 1. (3) The method of manufacturing a composite material tube according to claim 1, wherein the single oriented or knitted fabric comprises fibers such as carbon fibers, glass fibers, Keplerian fibers, or a mixture thereof. (4) The method for manufacturing a composite material pipe according to claim 1, wherein the volume of the pre-impregnated material is 40 to 60% as a resin content. (5) The method for manufacturing a composite material pipe according to claim 1, wherein the fiber fabric is selected from woven fabrics, knitted fabrics, knitted pipes, woven pipes, etc. that are not impregnated with resin. . (6) The method for manufacturing a composite material pipe according to claim 5, wherein the fiber fabric is made of carbon fiber, glass fiber, Keplerian fiber, colored organic fiber, or a mixture thereof. (7) The core as the center part is a plastic tube with one end closed, a rod-shaped thing having a high coefficient of thermal expansion and a high total volume coefficient, or a metal rod as the core. A method for manufacturing a composite material pipe as described in Section 1. (8) The source of the pressure generated outward from the center refers to the pressure generated after a core having a high total volume coefficient and a high coefficient of thermal expansion expands due to heat. A method of manufacturing the described composite material pipe. (9) The source of the pressure generated outward from the central portion is generated by blowing high-pressure air through the open end of a plastic tube with one end closed. A method of manufacturing the described composite material pipe. (10) The pressure generated from the outer periphery toward the center is the pressure generated when a type of heat-shrinkable plastic tube or tape contracts due to heat. A method of manufacturing the described composite material pipe.