JPS61199932A - Manufacture of frp bar - Google Patents

Abstract

PURPOSE:To efficiently manufacture a high-quality FRP bar by a method wherein a sheet-shaped prepreg, which is obtained by cutting open a tubular prepreg in the direction of the axis of a mandrel under un-cured state, is chopped in the form of tape with arbitrary width and piled up in a molding split die and finally heated under pressure. CONSTITUTION:A prepreg consisting in cross-winding yarn tape onto an anvil 6 is cut off in the direction of the axis of the anvil 6 at a cut-off portion 8 with a cutter knife or the like in order to obtain a sheet-shaped prepreg 9. The sheet-shaped prepreg 9, which consists of resin-impregnated yarn tape piled up with an arbitrary angle and interlocked in cross-wound state, is chopped in the form of narrow tape and piled up in a tubular molding split die in order to obtain a FRP bar by heating under pressure. By the above-mentioned method, various machinings of a product can be done easily and lightly, resulting in enabling to efficiently realize the small quantity and large quality production of bars with excellent strength.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing fiber-reinforced plastic rods. For more details, see High-strength? Regarding the method of manufacturing hammered bolts and nuts at low cost and rationally, how can we efficiently manufacture the starting material, FRP shards before thread cutting, with high quality? RI' rod-shaped body manufacturing method y! 'It is what we provide.

Conventional technology Conventionally, FR before thread cutting used for FRP ports, etc.
The easiest and most commonly used method for producing B rods is F, which is made by stacking multiple sheets of resin-impregnated yarn cloth to a desired thickness, and then heating and press-molding them.
There is a method of cutting an RP board into a prismatic shape, cutting it into a round bar, etc., and then threading it.

As the most efficient method, a method for producing a rod-shaped body is also known, in which a resin-impregnated roving of an arbitrary thickness is drawn into a molding cylinder and continuously pulled out. For example, when a bolt is threaded from a round bar using this method, the fibers at the threaded portion are cut, resulting in a bolt with weak strength.

Problems to be Solved by the Invention However, in the former method, since yarn cloth is used as the reinforcing fiber, it is extremely expensive and has prevented its commercialization. In the latter case, when a bolt is threaded from a round bar, fibers in the threaded portion are cut, and improvements in terms of strength are awaited. Thus, in the present invention, IPRP4
When the s-shaped body is made into a bolt by threading, for example, in terms of quality, I
In order to provide an extremely strong bolt, in which the reinforcing fibers are arranged both in the screw axis direction and in the thread number, similar to the bolt cut out from an FRP molded plate, we also developed the manufacturing technology. The aim is to provide an efficient production system that is most suitable for the made-to-order manufacturing system with multiple product rights, which is common knowledge in the Maki industry, and a manufacturing method that is inexpensive and can be produced within a single lead time. It is.

Means for solving the considerations The present invention thus provides: 1. A step of winding a resin-coated yarn tape around a cylindrical mandrel a predetermined number of times using a filament winding method to prevent fraying, and impregnating it with a thermosetting resin during, before, or after this winding step; There is a step of cutting the uncured prepreg cross-wound into a cylinder in the axial direction of the mandrel, and cutting the cut sheet prepreg into a tape shape of a desired width, and placing it in a split mold for molding. A method for manufacturing a rod-shaped fiber-reinforced plastic body comprising the steps of stacking, pressing and heating.

゛Hereinafter, the manufacturing process of the present invention will be explained one by one.

First of all, there is a twill winding process of the yarn tape using the filament winding method.
As shown in No. 422, No. 54-35231, etc., there is a method of obtaining a shaped plate by stacking a plurality of sheets of prepreg obtained by winding a simple glass roving around a cylindrical mandrel using a filament winding method and forming the sheets under heat and pressure. However, in the case of plates formed by this method, the rovings flow laterally during pressure molding, creating dense and dense areas of reinforcing fibers and resin, and there is no strong bond between the fibers arranged parallel to each other. Compared to yarn cloth molded plates, the strength was insufficient. On the other hand,
Since the prepreg of the present invention is woven in units of tape width, the fibers are connected to each other, and since these yarn tapes are cross-wound, a strength equal to or higher than that of yarn cloth can be obtained.

In addition, this yarn tape is coated with a resin to prevent fraying, so it can be used with tape press rollers in the resin bath before being cross-wound around a cylindrical anvil, and with a comb-like shape for aligning the tape at arbitrary intervals. There is no fuzzing, fraying, or shedding of fibers in the yarn tape due to rubbing, rubbing, twisting, etc. on the guide or Wm rear arm, and the undamaged yarn tape is cross-wound, resulting in a prepreg of good quality.

Next, the prepreg is cut into short strips. Conventionally, the prepreg that has been cross-wound around a predetermined cylindrical anvil is cut into sheets, which are then stacked by changing the fiber direction. For example, after making it a board? Molding has been carried out in molds for products such as , boats, and bathtub cases. However, in order to obtain a rod-shaped body, the present inventor uses an extremely simple method in which the uncured Silipreg is cut into a tape shape of arbitrary width using dressmaking scissors and loaded into a rod-shaped mold. This led to the invention of a new method for molding rod-shaped bodies from prepreg.

Molded IPRP wears the teeth to such an extent that it cannot be cut without using special tools, making DO machining difficult. However, the uncured Silipreg before molding is bendable and can be used with cutter knives, dressmaking basaminas, etc. The IFRP molding DO process can be greatly improved by cutting it to any size according to the mold at this stage, filling it with the cut prepreg of the designed capacity, and performing the molding process. It can be done.

Furthermore, the most characteristic feature of the present invention is that the FRB rod-shaped body is molded using the cylindrical molding split mold made of silicone preg cut into short lengths (tape-like long prepreg).

Although it is common practice to use a pair of male and female molds in molding methods using prepreg, this method has not yet been adopted for molding rod-shaped objects. do not have.

Moreover, even if it were adopted, there is no way that it would be of good quality. This is because the reinforcing fibers in conventional prepreg are rovings, and even if they are cut into thin strips and stacked, there is no strong connection between the parallel fibers, and the prepreg collapses during 110-pressure molding. This results in poor distribution of the dense and dense resin in the fibers, resulting in insufficient strength and unevenness. However, since the prepreg of the present invention is reinforced with woven yarn tape, the reinforcing fibers are connected in units of tapes, and each tape is twilled, so the fluidity of the resin can cause the voids in the mold to collapse. It easily fits into the mold, and when pressurized, it fills the mold tightly.

For this reason, the molded FRB rod-like body has reinforcing fibers arranged both in the vertical and horizontal directions, similar to the yarn cloth molded plate, and a strong rod-like body can be obtained.

In this way, the prepreg using the yarn chip f of the present invention is cut into short pieces, piled up in a cylindrical mold, and heated under pressure. In addition to rods and square balls, it is possible to obtain FRP shells of arbitrary irregular shapes such as polygonal or LWO-shaped cross sections.

Further, by forming threads on the split die, a rolled screw can be obtained, and by applying various types of uneven processing to the inner surface of the dJ type, an FRP rod-shaped body having a rolled pattern having these patterns can be obtained.

Furthermore, if you want to form a hollow part in the shaft core of the rod-shaped body, you can stack the short pieces so that the anvil is sandwiched between them, and then pull out the anvil after pressure forming to form the hollow part. FRP salary can be obtained.

At this time, by making this ambi A/ into a threaded anvil, it is possible to develop it in a straight manner, such as by rotating and pulling out the anvil after the molding process to obtain a rod-shaped body with a female thread in the shaft core. It is.

Above, we have explained the IFRP salary of the present invention from the quality and functional aspects, but now we will add an explanation from the perspective of production technology and rational production of products. First, the method of the present invention covers everything from raw materials to products. Since it is not an integrated production method, it is suitable for making small quantities of many kinds of products to order.The prepreg, which can be stored at room temperature, can be cut into short lengths according to the order, so production is flexible and there is no loss of prepreg. The mold is not large-scale, and the required number of molds is increased to 7JO.
You can operate production efficiently just by doing this.

Furthermore, the manufacturing cost of reinforcing fiber yarn cloth can be dramatically reduced by using, for example, a double-sided cutting tape for yarn cloth, which has conventionally been disposed of.

It does not matter which method is used, such as one woven into a tape, a selvage section made by cutting a yarn cloth, or a yarn tape made by actively cutting a yarn cloth.

In addition, the fiber "C" used in this yarn tape is glass fiber, which is inexpensive and has high practicality from an economic point of view, but other materials such as aramid fiber and carbon fiber, which have a tensile elasticity of 46,000 Kf, are also used.
/ ttm2 or more, and any plastic reinforcing fiber having a tensile strength K of 100 ww'' or more may be used.

Epoxy resin is most suitable as the thermosetting resin, but unsaturated polyester resin, vinyl ester resin, and other thermosetting resins may also be used.

Furthermore, the yarn tape of the present invention is coated with a resin to prevent it from fraying.When the yarn tape is cross-wound using a filament winding machine, the yarn tape is rubbed and twisted by the tape presser roller, comb-toothed guide, and traverse arm in the resin bath. , the glass yarn tape becomes fuzzed, frayed, and fibers fall off due to ironing, and as these fiber wastes remain attached to the resin-impregnated tape and are wound and formed, the fiber threads of the tape include these unconnected fibers. The fiber waste deteriorates the physical properties of the reinforced plastic and causes the threads to collapse during the thread cutting process.

Another problem with the manufacturing process is that these fiber wastes increase the viscosity of the resin in the resin bath, so during equipment operation, fiber waste must be constantly removed to control the resin viscosity, and at the end of the day, the resin in the resin bath must be removed. Otherwise, the viscosity would increase and the device could not be reused the next day.

What was invented as an improvement system was the use of a resin-coated glass yarn tape in order to prevent fraying in the method of the present invention. This greatly improved viscosity control, and even though the resin in the resin path was not removed at the end of the day, it was removed the next day when operations resumed! ! -Can now be reused.

Here, the glass yarn tape coated with resin to prevent fraying used in the present invention is, for example,
As disclosed in No. 15563, tapes in which the tassel portions of glass fabrics or the cut portions of cut glass cloth are heated and melted and impregnated with polyester resin to prevent fraying, and glass fabric hits are treated with polyester resin to prevent fraying. For example, in the case of glass fiber, polyester resin or ethylene-vinyl acetate copolymer is added to the woven fabric at a rate of 10%.
The appropriate weight is less than 5 weight, preferably less than 5 weight, and these coating resins must have good compatibility and adhesion with the thermosetting resin used for molding, and must not deteriorate the physical properties of the molded rod.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Figure 1 is a perspective view showing a prepreg manufacturing method according to the method of the present invention. A necessary number of grilles are pulled out from the grille 2, aligned through a comb-shaped guide 3, and impregnated with thermosetting resin in a lane bus 4. At this time, the tape is immersed by a tape pressing roller 5 so that the yarn tape is completely immersed in the resin liquid and air bubbles in the tape are defoamed. The resin-impregnated yarn tapes are repeatedly wound back and forth around a mandrel 6 at an arbitrary angle using a traversing device 7 in a parallel state.

The traversing device T1 comb teeth guide etc. has the number, shape, and spacing of the comb teeth set arbitrarily according to the type, size, and number of yarn tapes, and also has the role of providing appropriate tension to each yarn tape. , it shall be a guide that does not damage the yarn tape.

Figure 2 shows the state in which the yarn tape is wound around a mandrel. The forward tape (travel angle θ) and the return tape (travel angle θ,') form a twill in the opposite direction, and each tape They are each other's VC'IL.

FIG. 3 shows a method of obtaining a sheet-like prepreg 9 by cutting a prepreg made of yarn tape cross-wound around an anvil at an incision site 8 along the axial direction of the anvil 6 with a cutter knife or the like.

At this time, the winding thickness varies depending on the diameter of the mandrel, but
A thickness of 6 to 1 square inch is usually suitable as a thickness at which wrinkles do not occur when the prepreg is cut into a sheet-like prepreg.

Figure 4 shows the arrangement of yarn tapes in a sheet-like prepreg, and the prepreg made of a group of resin-impregnated yarn tapes that are twisted and twilled at arbitrary angles is shown in Figure 5. The IFRP rod-shaped body is obtained by cutting it into a narrow tape shape, stacking it in a cylindrical split mold for molding, and subjecting it to DO heat pressurization.

The F, R, P, rod-shaped bodies obtained as described above are composed of two groups of mutually orthogonal fibers constituting the yarn tape itself and the twill of the tape in the case of a yarn tape whose base material, prepreg, is imaged. It is further fiber-reinforced with two groups of crossed fibers produced by the winding, and these are arranged in layers, so that the formed rod-shaped body is fiber-reinforced both in the axial direction and the circumferential direction, resulting in excellent strength. A rod-shaped body is obtained.

Next, the characteristics of a ZARTO screw product obtained from an IFRP rod-shaped body by the method of the present invention will be described as an example.

First of all, the dimensions and shape of the cylindrical split mold for forming can be arbitrarily designed depending on the thickness of the bolt to be obtained, but is it free-cutting during thread cutting? : In terms of efficiency, a cylindrical split mold with a bolt diameter to slightly thicker than the bolt diameter is effective for holding.

Further, the amount of tape-shaped presoleg filled therein may be designed to be approximately equal to or larger than the volume of the cylindrical split mold during pressure molding. In addition, the width of the tape can be cut into a cross-sectional shape that can be stacked so that it has approximately the same shape as the cross-section of the mold, and if the tape width is made slightly narrower and overloaded EEf, the cross-wound tape will be made of resin. Due to its fluidity, it expands in the width direction, fits into the mold, and is densely filled.

Silipreg made by twilling varies depending on the twill angle, but
As the tape groups that are orthogonal to each other become more parallel, the elongation in the width direction becomes larger, and the moldability improves.

Bolts that have been threaded from RJFRP molded bales in this way are reinforced with fibers from the threaded part to between the thread numbers, and the W fat in the threaded parts is firmly restrained by these interwoven fiber groups. This results in a salt with excellent thread shear strength.

At this time, the width of the cut Silipreg varies depending on the thickness of the bolt, but it is preferably at least twice the thread height and approximately less than the bolt diameter. , all the reinforcing fibers in the axial direction are cut during thread cutting, and the thread strength deteriorates significantly. Also, if the width is wider than the bolt diameter, it will bend in the mold, and the effect will be essentially the same as the bolt diameter, or it will fold in a complicated way in the mold, causing light dispersion. It is conceivable that it will not exhibit sufficient strength.

However, in the present invention, these tape widths are not particularly limited, and may be arbitrarily designed depending on the purpose of use and the size and shape of the FRP molded bale to be obtained.

Further, to give an example of a case where a female screw nut product is obtained from the FRP rod-shaped body of the present invention, for example, a cylindrical split mold is formed with a cross section of 6
If you make a square shape, drill a hole in the axis of the hexagonal shape obtained in the same manner as above, and then process a screw hole using a normal method such as a tap drill, you can obtain a screw nut with excellent thread shear strength similar to the bolt described above. In addition, an anvil of arbitrary thickness is inserted into the shaft core during molding, and a hollow PRP'Ds-like body is obtained by removing this rod-shaped anvil after molding, so if this method is adopted, the drilling process can be simplified. Can be omitted.

Furthermore, by using an easy-to-cut material for the anvil, such as wood, bamboo, resin, or aluminum, it is possible to thread the anvil without removing the anvil after molding.
It is possible to perform O-work.

For example, use a threaded metal bolt as the anvil, apply a release agent, and remove the anvil metal bolt from the PRP shell after molding while rotating along the marked line. An FRP rod-shaped body with a female thread is obtained, and by cutting this to an arbitrary length, a hexagonal nut can be made.

The internally threaded product produced by this method does not undergo thread cutting using teeth, so there is no fiber breakage at the threaded portion, resulting in a female threaded product with excellent thread strength.

The above examples have been given for male threaded bolt products and female threaded nut products, but according to the method for manufacturing an FRP bale-shaped body of the present invention,
In addition, various product processing is possible easily and easily.
It has become possible to efficiently produce high-quality, low-volume rod-shaped bodies with reduced strength.

[Brief explanation of the drawing]

The drawings are all related to the implementation of the present invention; FIG. 1 shows the process of winding the yarn tape around the mandrel, FIG. 2 shows the yarn tape being wound around the mandrel, and FIG. FIG.
The figure shows the alignment state of Silipreg yarn tape.
Figures (5a, sb, sc) show the stacked state of the prepreg-mounted pieces within the split shape. The drawing numbers are as follows. 1: Glass yarn tape with fray prevention 2: Tape grill 3: Comb-shaped tape guy V 4: Reden bath (resin dipping tank) 5: Tape presser roller 6: Mandrel 7: Twill swing! (Trailing arm) 8: Incision site 9: Tape angle θ′ for sheet prepreg 02: Tape angle for return 10: Thin tape-shaped silicon preg 11: Cylindrical molding split mold 12: Core material (anvil) Patent application Person Asahi Kasei Kogyo Co., Ltd. Figure 2 Figure 3 Figure 5 (5o) (5b) Procedural amendment (voluntary) April 1, 1985 1 Mr. Manabu Shiga, Commissioner of the Patent Office 2
1. Indication of the incident 1985 patent application No. 38779 2.
Name of the invention: Method for manufacturing FRP rod-shaped body 3, Relationship with the case of the person making the amendment Patent applicant: 1-2-6-4 Dojimahama, Kita-ku, Osaka-shi, Osaka Prefecture, Full text of the symmetrical specification of the amendment 1 Drawing (2) Drawing No. Figure 1 is corrected as attached. Description, title of the invention, method for producing an FRP rod-shaped body, claims, a step of winding a fray-prevented yarn tape around a cylindrical mandrel a predetermined number of times using a filament winding method, and a process during or after this winding step. A step of impregnating a thermosetting resin before or after, a step of cutting the uncured prepreg cross-wound into a cylinder in the axial direction of the mandrel, and cutting the cut sheet-like prepreg to a desired width as necessary. A method for producing a rod-shaped fiber-reinforced plastic body, which comprises the steps of cutting into a tape shape and heating and pressurizing it in a molding die. 1. Detailed Description of the Invention Field of Industrial Application The present invention relates to a method for manufacturing a fiber-reinforced plastic rod. More specifically, regarding a method for manufacturing high-strength FRP bolts and nuts at low cost and in a rational manner, the FRP rod-shaped method solves the problem of how to efficiently manufacture the starting material, the FRP rod before thread cutting, with high quality the first time. The present invention provides a method for manufacturing a body. Conventional technology Conventionally, FR before thread cutting used for FRP bolts, etc.
The easiest and most commonly used method for producing P rod-shaped bodies is F, which is formed by stacking multiple sheets of resin-impregnated yarn cloth to a desired thickness, and then heating and press-molding this.
There is a method of cutting an RP board into a prismatic shape, cutting it into a round bar, etc., and then threading it. As the most efficient method, there is also a method for manufacturing a rod-shaped body in which resin-impregnated rovings of arbitrary thickness are drawn into a molding cylinder and continuously pulled out. Also known is a so-called pultrusion method in which a plurality of yarn tapes are drawn into a cylindrical mold and cured. Problems to be Solved by the Invention However, in the method using yarn cloth, yarn cloth is used as the reinforcing fiber, so although the tensile strength is quite satisfactory, the torque strength is low, and it is very expensive to commercialize. is being prevented. In the method using roving, when a bolt is threaded from a round bar, the fibers in the threaded portion are cut, and an improvement in terms of strength is awaited. The pultrusion molding method from yarn tape has stronger torque reinforcement than the press molding method, but has the disadvantage of lower tensile strength. Thus, in the present invention, when an FRP rod-shaped body is threaded to form a bolt, in terms of quality, similar to the bolt cut from an FRP molded plate made of yarn cloth, the reinforcing fibers are We provide extremely strong bolts that are aligned both in the thread axis direction and in the thread white direction. It is an object of the present invention to provide an efficient production form that is most suitable for the production form, and a manufacturing method that is inexpensive and can be produced in a single delivery period. A process of cross-winding the yarn tape onto a cylindrical mandrel a predetermined number of times using a filament winding method, a process of impregnating a thermosetting resin during, before, or after this winding process; A process of cutting the cross-wound uncured prepreg in the axial direction of the mandrel, and cutting the cut sheet prepreg into tapes of arbitrary width if necessary, stacking them in a molding die and heating them under pressure. The method of manufacturing a fiber-reinforced plastic rod-like body consists of the following steps.The manufacturing steps of the present invention will be explained step by step below.First, the yarn tape cross-winding step using the filament winding method will be described.As a conventionally known example. , for example, Special Publication No. 54-35231, No. 54-30422.
As shown in the above issue, the prepreg obtained by cross-winding a simple glass roving around a cylindrical mandrel using the filament winding method is cut in the axial direction of the mandrel, and the obtained prepreg sheets are stacked and molded under heat and pressure. There is a method to obtain a molded plate. However, the plate formed by this method has strong strength in the circumferential direction because the rovings are oriented in the circumferential direction of the mandrel;
Since the rovings were not oriented in the axial direction of the mandrel, the strength of the fibers arranged parallel to each other was only the resin, and the transverse strength was insufficient compared to the yarn cloth molded plate. To this end, methods have been proposed in which chopped strands are sandwiched between roving layers, or continuous fibers are sandwiched in a swirl shape to increase the lateral strength. On the other hand, since the prepreg of the present invention is woven in units of tape, the fibers are connected to each other, and since these yarn tapes are cross-wound, it can achieve strength equal to or higher than that of yarn cloth. . In addition, this yarn tape has end threads or resin coating to prevent it from fraying, so it can be used with tape presser rollers in the resin bath before being wrapped around a cylindrical anvil, and with comb teeth to align the tape at arbitrary intervals. There is no fuzzing, fraying, or shedding of fibers in the yarn tape due to rubbing, rubbing, twisting, etc. with a guide or traverse arm, and the undamaged yarn tape is traverse-wound, resulting in a prepreg of good quality. Next, the prepreg is cut in a short length.As mentioned above, the conventional method is to cut the prepreg in which the roving is cross-wound around a predetermined cylindrical mandrel into sheets, and then change the fiber direction. After stacking them to a desired thickness, they are molded in a mold to make, for example, a board, a boat, a bathtub case, or the like. However, in order to obtain a rod-shaped body, the present inventor has developed an extremely simple method in which the prepreg in an uncured state is cut into a tape shape of a desired width using dressmaking scissors, etc., and then loaded into a rod-shaped mold. can be used. In general, molded (hardened) FRP is difficult to process as it wears out the parts so much that it cannot be cut without using special tools, but prepreg in an unhardened state before molding is bendable. In addition, it can be easily cut with a cutter knife, dressmaking scissors, etc. At this stage, it is cut to any size according to the mold, and the cut design capacity of prepreg is filled and molded, which greatly reduces the FRP molding process. This can be greatly improved. Furthermore, the most characteristic feature of the present invention is that the prepreg cut into the short shapes (tape-like long prepreg) is molded into an FRP rod-shaped body using a cylindrical molding split mold. Although it is common practice to use a pair of male and female molds in molding methods using prepregs made from yarn cloth or roving, this method is not suitable for molding rod-shaped objects. method has not yet been adopted. Moreover, even if it were adopted, there is no way that it would be of good quality. This is because conventional prepreg is a sheet-like yarn cloth with reinforcing fibers, and even if it is cut into thin strips and stacked, it will not flow and remain as it is.
It was impossible to obtain a molded product in which the glass fibers were uniformly filled throughout the mold by simply squeezing out the resin under pressure. In contrast, in the prepreg of the present invention, the woven yarn tape is laminated with a twill of 60 to 87.5%, so when press molding, the resin and glass fibers do not flow in the winding direction, but in the axial direction of the mandrel. (in the direction perpendicular to the winding), the glass fiber and resin flow sufficiently uniformly with a charge area of 100 to 50% of the mold, especially when using a positive mold (Figure 6), the molding material flows into the mold. This creates a structure in which the glass fibers are wound around the cross section of the rod in the circumferential direction, making it possible to produce a formed rod with tensile strength comparable to that of a rod cut from a molded plate, and with nearly double the torque strength. becomes. The FRP rod-shaped body formed in this way has reinforcing fibers arranged in both the vertical and horizontal directions, similar to a yarn cloth molded plate, resulting in a strong rod-shaped body. In this method, a prepreg using the yarn tape of the present invention is appropriately cut into band shapes, and is pressurized and heated in a cylindrical split mold or a positive mold to form an FRP rod-shaped body. In addition to rods and square rods, since the prepreg spreads freely and uniformly in the direction perpendicular to the rod direction, it is possible to obtain FRP rods with arbitrary irregular cross-sections such as polygons, L-shapes, and C-shapes. Further, when the diameter of the rod-shaped body is large, the prepreg may be cut to the appropriate diameter size, and in some cases, the prepreg may be used in a so-called sushi-wound shape without being cut. Further, by forming threads on the split mold, a rolled screw can be obtained, and by applying various types of uneven processing to the inner surface of the split mold, an FRP rod-shaped body with a rolled pattern having these patterns can be obtained. Furthermore, if you want to form a hollow part in the shaft core of the rod-shaped body, you can stack the anvil rods so that they become narrow when stacking the short prepregs, and then pull out the anvils after pressure molding to form an FRP rod with a hollow part. is obtained. At this time, by using a threaded anvil as the anvil, various developments are possible, such as by removing the anvil while rotating it after the molding process, to obtain a rod-shaped body with a female thread in the shaft core. The pressurizing and heating conditions of the molding die in the present invention are preferably 15 ksr/cj to 80 kg/cj, 100 to 80 kg/cj.
150°C condition, particularly preferably 40-50 kg/c
a, 120°C ± 5°C. Above, we have explained the FRP rod of the present invention from the aspects of quality and functionality, but now we will add an explanation from the perspective of production technology and rational production of products. First, the method of the present invention covers everything from raw materials to products. Since it is not an integrated production system, it is suitable for making small quantities of a wide variety of products to order.The prepreg, which can be stored at room temperature, can be cut into short lengths according to the order, so production is flexible and there is no loss of prepreg. The mold is not large-scale, and production can be carried out efficiently by simply increasing the required number of molds. Furthermore, the manufacturing cost of reinforcing fiber yarn cloth can be dramatically reduced by using, for example, a double-sided cutting tape for yarn cloth, which has conventionally been disposed of. The yarn tape used in the present invention can be obtained by any method, such as a selvedge part made by cutting a yarn cloth that has been woven as a yarn tape from the beginning, or a yarn tape made by cutting a yarn cloth. It doesn't matter if it's given to you. In addition, glass fiber is inexpensive and economically practical as the fiber used for this yarn tape, but other fibers such as aramid fiber and carbon fiber have a tensile modulus of 6000 kg/-.
As mentioned above, any plastic reinforcing fiber having a tensile strength of 100 kg/- or more may be used. Epoxy resin is most suitable as the thermosetting resin, but unsaturated polyester resin, vinyl ester resin, and other thermosetting resins may also be used. Furthermore, in order to prevent the yarn tape from fraying in the present invention, the end yarns are provided with entanglement threads or resin coated, so that when the yarn tape is cross-wound using a filament winding machine, the tape pressing roller in the resin bath or the comb-toothed The glass yarn tape becomes fuzzed, frayed, and fibers fall off due to rubbing, twisting, and straining caused by guides and traversing arms, and these fibers adhere to the resin-impregnated tape as it is wound and formed, resulting in the tape's fiber thread-like appearance. This is because these unconnected fiber waste portions deteriorate the physical properties of the reinforced plastic and cause the threads to collapse during the thread cutting process. Another problem with the manufacturing process is that these fiber wastes increase the viscosity of the resin in the resin bath, so during equipment operation, fiber waste must be constantly removed to control the resin viscosity, and at the end of the day, the resin in the resin bath must be removed. Otherwise, the viscosity would increase and the device could not be reused the next day. As an improvement measure, the method of the present invention employs a glass yarn tape with fray prevention. This greatly improved viscosity control, and the resin in the resin bath could now be reused the next day when operations resumed, without having to remove it at the end of the day. Here, the glass yarn tape coated with resin to prevent fraying used in the present invention refers to the tufted portion of glass fabric or the cut portion of cut glass cloth, as disclosed in JP-A-59-15563, for example. Yarn tapes include tapes made by heating and melting polyester resin and impregnating them to prevent fraying, and yarn tapes made by applying polyester resin to prevent fraying from glass fabrics and then cutting them into tapes at any time. In this case, it is appropriate that the polyester resin or ethylene-vinyl acetate copolymer be present in an amount of 10% by weight or less, preferably 5% by weight or less, based on the woven fabric in the resin coating part, and these coating resins are mixed with the thermosetting resin used for molding. It must have good compatibility and adhesion, and must not deteriorate the physical properties of the molded rod. Embodiments Hereinafter, embodiments of the present invention will be described in detail according to the drawings. FIG. 1 is a perspective view showing a method of manufacturing plastic according to the method of the present invention. First, a necessary number of fray-prevented yarn tapes 1 are pulled out from a tape bobbin 2, passed through a comb-shaped guide 3, and then heated in a retin bath 4. Impregnate with curable resin. At this time, the tape is immersed by a tape pressing roller 5 so that the yarn tape is completely immersed in the resin liquid and air bubbles in the tape are defoamed. The resin-impregnated yarn tapes are wound in parallel on a traverse mandrel 6 at an arbitrary angle, preferably 60 to 87.5° C., by a traversing device 7 in a reciprocating manner. The traversing device 7, comb tooth guide, etc. have the number, shape, and spacing of the comb teeth set arbitrarily according to the type, size, and number of yarn tapes, and also serve to provide appropriate tension to each yarn tape. It must be a guide that does not damage the yarn tape. Figure 2 shows the state in which the yarn tape is wound around a mandrel. The forward tape (travel angle θ) and the return tape (travel angle θ') form a twill in the opposite direction, and each tape is mutually They overlap. Figure 3 shows the incision site 8 along the axial direction of the mandrel 6 through the prepreg made of yarn tape that is cross-wound around the anvil.
cut out with a cutter knife etc. to make sheet prepreg 9
This shows how to obtain . At this time, the winding thickness varies depending on the diameter of the mandrel, but the thickness is usually 3.5 mm, which does not cause wrinkles when cut and formed into a sheet prepreg.
~10 fin thickness is appropriate. Figure 4 shows the arrangement of the yarn tapes in the sheet-like prepreg, and the prepreg, which is made up of a group of resin-impregnated yarn tapes stacked at arbitrary angles and twilled, is thinned as shown in Figure 5. FR is made by cutting into wide tape shapes, stacking them in a cylindrical split mold, and heating and pressurizing them.
A P rod-shaped body is obtained. Also, as shown in Figure 6, if the prepreg cut into a thin tape shape from a mold is pressed under pressure with a positive mold, the twilled tape will flow uniformly and the glass fibers will flow in the circumferential direction. You can create a rolled stick. Also,
If the diameter of the mold is large, the ideal shape can be obtained by rolling the prepreg into a sushi roll as shown in Figure 7. Example 1 A polyester coating was applied to the area 12 m beyond the end (tip of the fray preventer) of glass fiber cloth woven on an air jet loom (5% of the base fabric in the coating area).
This portion was cut with a carbide cutter to obtain a glass fiber yarn cloth tape with a width of 12 ta. Align five of these tapes and use epoxy resin (AER33
1... Asahi Kasei Kogyo [) 100 parts, acid anhydride (HN
2000...Hitachi Chemical) 80 parts and A as an accelerator
Pass 2 parts of TC-3 (ACI...Japan) through a well-mixed resin solution, impregnate the yarn cloth tape with the resin solution, and then apply it to a 92 cm diameter drum with a width of 1.5 cm while shaking the yarn cloth tape to a width of 6 cm. The film was wound up to a length of 1.5 m (the winding angle was 85°), then cut in the axial direction of the drum, opened to form a sheet, and left at a room temperature of 20° C. for one week. This is called prepreg A. Width 2.0c from the obtained prepreg A
A prepreg tape with a length of 108 m is cut out in the winding direction of the tape using a cutter knife, and this is cut into a prepreg tape with a length of 110 m.
8a, width 2.5 cm, as shown in Figure 6, was charged into a mold heated to 120°C, and pressure was applied lightly at first until the resin overflowed a little, and when the resin became sticky, a pressure of 30 tons was applied and the mold was heated to 120°C. After curing in the mold for 1 hour and taking out from the mold, post-curing was performed at 120° C. for 3 hours and then at 150° C. for 5 hours to obtain a hexagonal bar with a length of 10 BcIII and a width of 2.5 cm. The clearance for the money type was 0.05 dragon. From this stick, there are 22 cranes with a length of 20 cm and a diameter of 1.
8 Crane rods were cut out using a toolbox glider on a lathe, and then centerless machined to a diameter of 19.8m.
A rod with a diameter of 15.8 am and a diameter of 15.8 am was obtained, and an M2O bolt was made from the rod by die processing. The tensile strength and torque strength of this bolt were measured using an M2O iron nut with a thickness of 20 mm, and the values shown in the following table were obtained. Example 2 Prepare prepreg A in the same manner as in Example 1, cut this prepreg A to a width of 25 cm in the tape winding direction, roll it in the same way as making maki sushi, and use the same mold as in Example 1. Press molding was carried out under the same molding conditions. An M2O bolt was made from the obtained hexagonal bar in the same manner as in Example 1, and a tensile torque strength test was conducted. The results are shown in the table below. (Measured using an M2O iron nut with a thickness of 20 cm) On the other hand, using prepreg A and a 50 cm square mold under the same molding conditions, a 50 cm square plate with a thickness of 22 cm was made. Cut out a rod and use it as in Example 1.
A round bar with a diameter of 9.8M was prepared, an M2O screw was formed by die processing, and the tensile strength and torque strength were measured. The results are shown below. (Measured using an M2O iron nut with a thickness of 20 nm) Example 3 Using prepreg A prepared in the same manner as in Example 1, it was cut into a 2cI11 width and 60cm length to a length of 60an. Using a mold with a diameter of 22 mm as shown in Figure 5 (5C), press molding was performed under the same molding conditions as in Example 1 to create a round bar. The obtained rod was processed into a diameter of 19.8φ by centerless processing.
I made a perfect round bar and threaded it with a die to create an M2O bolt.This was M20, thickness 20
The tensile strength and torque strength were measured using the *■ iron nut, and the results are shown below. In the case of a yarn tape in which the prepreg as the base material is woven, the FRP rod-shaped body obtained as described above has two fiber groups orthogonal to each other that constitute the yarn tape itself.
It is further fiber-reinforced with two groups of crossed fibers produced by #II winding of the tape, and these are arranged in layers, so that the formed rod-shaped body is fiber-reinforced both in the axial direction and the circumferential direction. , a rod-shaped body with excellent strength can be obtained. Next, we will discuss the characteristics of a bolted product obtained from an FRP rod-shaped body by the method of the present invention. First, the dimensions and shape of the cylindrical split mold for forming can be arbitrarily designed depending on the thickness of the bolt to be obtained, but in order to maintain free machinability during thread cutting, the size and shape of the cylindrical split mold for forming may be arbitrarily designed. A split cylindrical mold with a diameter of about 100 mm is efficient. Further, the amount of tape-shaped prepreg filled therein may be designed to be approximately equal to or larger than the volume of the cylindrical split mold during pressure molding. In addition, the width of the tape can be cut into a cross-sectional shape that can be stacked so that it has approximately the same shape as the cross-section of the mold, and if the tape is made slightly narrower and overloaded and pressurized, the cross-wound tape will be made of resin. Due to its fluidity, it freely expands and contracts in the middle direction, fits into the mold, and is densely filled. In addition, if the prepreg in contact with the mold surface is made wider than the cross section of the mold, and narrow in the center, the glass fibers will be rolled up well. The prepreg formed by 12 wraps has a length of π depending on the winding angle, but as the mutually orthogonal tape groups become more parallel, the widthwise elongation increases and conformability improves formability. Bolts that are threaded from such FRP molded rods are reinforced with fibers from the threaded part in the direction of the thread, and the resin in the threaded part is firmly constrained by these interwoven fiber groups. A bolt with excellent thread shear strength and torque strength can be obtained. At this time, the width of the prepreg cut along the line varies depending on the thickness of the bolt, but it is preferable that the width of the prepreg is at least twice the thread height and approximately twice the bolt diameter. If the width becomes too large, all the reinforcing fibers in the axial direction will be cut during thread cutting, and the thread strength will significantly deteriorate. If the width is twice or more than the diameter of the bolt, it will bend in the mold, and will not exhibit sufficient strength as it will fold over and over again in a complicated manner. However, in the present invention, these tapes are not particularly limited, and may be arbitrarily designed depending on the purpose of use and the size and shape of the FRP molded rod to be obtained. Further, to give an example of a case where a female screw nut product is obtained from the FRP rod-shaped body of the present invention, for example, a cylindrical split mold is made into a hexagonal cross section, and the axis of the hexagonal rod obtained in the same manner as described above is punched and tapped. If you drill a hole using a normal method such as a drill, you can obtain a female threaded nut with excellent shear strength similar to the bolt described above.Also, you can insert an annobil of any thickness into the shaft core during molding. If this rod-shaped anvil is later removed, a hollow FRP rod-shaped body can be obtained, so if this method is adopted, the drilling step can be omitted. Furthermore, by using a material that is easy to cut, such as wood, bamboo, resin, or aluminum, for the anvil, thread cutting can be performed without removing the anvil after molding. For example, a threaded metal bolt is used as the anvil, a release agent is applied, and the anvil metal bolt is removed from the FRP rod-shaped body after the molding process while spirally rotating, thereby forming a female thread in the shaft core. An FRP rod-shaped body is obtained, and by cutting this to an arbitrary length, a hexagonal nut can be made. The internally threaded product produced by this method does not undergo thread cutting using extrusions, so there is no fiber breakage at the threaded portion, and a female threaded product with excellent thread strength can be obtained. The above has been described as an example of a male threaded bolt product and a female threaded nut product, but according to the method for manufacturing an FRP rod-shaped body of the present invention,
In addition, various product processing is possible easily and easily.
It has become possible to efficiently produce rod-shaped bodies with excellent strength in small quantities and with high quality. 4. Brief description of the drawings The drawings are all related to the implementation of the present invention; Fig. 1 shows the process of winding the yarn tape around the mandrel, and Fig. 2 shows the state in which the yarn tape is wound around the mandrel. FIG. 3 is a diagram showing the state of cutting the prepreg shown in FIG.
The figure shows the alignment state of the prepreg yarn tape.
Figures (5a, 5b, 5C), Figures 6 and 7 show the stacked state of the prepreg-mounted pieces within the split shape. The drawing numbers are as follows. 1: Glass yarn tape with fray prevention 2: Tape bobbin 3: Comb-shaped tape guide 4: Resin bath (resin soaking tank) 5: Tape presser roller 6: Mandrel 7: Traverse device (traverse arm) 8: Incision site 9: Tape angle θ' for sheet prepreg 01: Tape angle IO for return: Narrow tape prepreg] 1: Cylindrical molding split mold 12: Core material (anvil) Patent applicant Asahi Kasei Industries, Ltd. Figure 1

Claims (1)

[Claims] A step of cross-winding a resin-coated yarn tape around a cylindrical mandrel a predetermined number of times using a filament winding method to prevent fraying, and a step of impregnating a thermosetting resin during, before, or after this winding step; The steps include cutting the uncured prepreg cross-wound into a cylindrical shape in the axial direction of the mandrel, and cutting the cut sheet prepreg into a tape shape of an arbitrary width.
A method for manufacturing fiber-reinforced plastic rods, which comprises the steps of stacking them in a split mold for molding, applying pressure and heating.