WO2022009500A1 - Method and device for cutting high-strength fiber sheet - Google Patents

Abstract

Provided is a method for cutting a high-strength fiber sheet in which a high-strength fiber sheet comprising a high-strength fiber for forming fiber-reinforced plastics is cut by means of sprayed abrasive grains. In this method for cutting a high-strength fiber sheet, a nozzle is moved so as to trace the outline, having a prescribed shape, of a sheet to be produced while spraying compressed air containing abrasive grains from the nozzle towards the high-strength fiber sheet, whereby the high-strength fiber sheet placed on a net-like base is cut to a prescribed shape.

Description

High-strength fiber sheet cutting method and cutting equipment

The present invention relates to a method for cutting a high-strength fiber sheet and a cutting device. More specifically, the present invention relates to a method for cutting a high-strength fiber sheet and a cutting device for cutting a high-strength fiber sheet made of high-strength fibers for forming a fiber-reinforced plastic by jetting abrasive grains.

Fiber reinforced plastic (FRP) is formed by impregnating a high-strength and high-elasticity material such as glass fiber and carbon fiber as a reinforcing material with plastic, and because of its high strength and light weight, aircraft parts and vehicle parts. , Boats, various tanks, containers, bulletproof vests, etc. are widely used as materials. However, since FRP is a difficult-to-cut material, it is not easy to process, and special machining, laser processing, water jet processing, blast processing, etc. are used for cutting and drilling, but in any case. There is a problem that the processing cost is high (see, for example, Non-Patent Document 1).
FRP is usually formed by impregnating a resin with a reinforcing material in the form of a sheet by weaving high-strength fibers in advance. Hundreds or more fiber sheets may be laminated to obtain the required strength. As mentioned above, cutting FRP is not easy and the processing cost is high. Therefore, in order to form a small number of FRPs, after processing the fiber sheet as a reinforcing material into the desired shape, unsaturated polyester resin / epoxy A method of forming an FRP having a predetermined shape by impregnating it with a resin or the like is also used.

Hitoshi Fukagawa, Toshiki Hirogaki, Takao Kato "Development of CFRP Drilling Technology by Blast", Journal of Abrasive Grain Processing Vol.56 No.4 2012 APR, 262-267

Since high-strength fiber sheets such as glass fiber and carbon fiber used for FRP use high-strength and high-elasticity materials, it is not easy to cut them into a desired shape. Examples of the cutting method include punching using a Thomson mold, laser machining, water jet machining, and the like. However, these processing methods require a large amount of equipment and increase the cost required for the mold and processing equipment. Further, laser machining is not preferable because the cut surface is affected by heat. Further, water jet processing is not preferable in that the water used for processing remains and affects the curing of the resin.
There is also a cutting method using an ultrasonic cutter, but there is a problem that the degree of freedom is low and the processing time is long because the ultrasonic cutter needs to be moved in parallel with the sheet surface.
For this reason, conventionally, a general blade such as a cutter knife or scissors has often been used for cutting a high-strength fiber sheet especially for a small amount of FRP. However, for example, when the high-strength fiber sheet 1 is cut by moving the cutting blade up and down in the normal direction with the sheet surface (see FIG. 9), the end portion 11 is twisted or distorted, and the fiber is frayed 18. (See FIGS. 10 and 11).

Here, as a conventional small blasting device, a tank for storing abrasive grains, a mixing section which is connected to the tank and mixes the abrasive grains and compressed air supplied from the tank, and a mixing section which is connected to the mixing section and contains compressed air. It is generally known that the nozzle is provided with a nozzle for injecting air. This small blasting device blasts a relatively small model deburring, a name plate, or the like, and even if it is simply used, a relatively large high-strength fiber sheet cannot be effectively cut.
In particular, in a small blasting device, it is difficult to quickly supply the abrasive grains in the tank to the mixing portion and to quickly stop the supply thereof. Further, since it is assumed to be used in a relatively short time, there is a concern that the abrasive grains may be clogged in the tank when used for a long time.

The present invention has been made in view of the above circumstances, and is a method for cutting a high-strength fiber sheet having low processing cost by using simple equipment, no fraying of the cut end, and excellent processing accuracy. It is an object of the present invention to provide a cutting device.

The present invention is as follows.
1. 1. A method for cutting a high-strength fiber sheet made of high-strength fibers for forming fiber-reinforced plastic and formed in the form of a sheet.
The nozzle was placed on a net-like base by moving the nozzle so as to trace the contour of a predetermined shape of the sheet to be produced while injecting compressed air containing abrasive grains from the nozzle toward the high-strength fiber sheet. A method for cutting a high-strength fiber sheet, which comprises cutting the high-strength fiber sheet into a predetermined shape.
2. 2. The base is a stainless steel wire mesh having an opening of 6 to 15 mm and a wire diameter of 1.5 to 2.5 mm. The method for cutting a high-strength fiber sheet according to.
3. 3. The high-strength fiber contains one of borosilicate glass, carbon and boron.
The abrasive grains contain at least one of glass powder and alumina. Or 2. The method for cutting a high-strength fiber sheet according to.
4. The high-strength fiber sheet is the woven fabric or non-woven fabric of the high-strength fiber. To 3. The method for cutting a high-strength fiber sheet according to any one of the above.
5. 1. A plurality of the high-strength fiber sheets are stacked and cut at the same time. To 4. The method for cutting a high-strength fiber sheet according to any one of the above.
6. The high-strength fiber sheet is a plain woven fabric made of carbon fiber.
The hole diameter of the nozzle is 0.3 to 1.5 mm, the diameter of the abrasive grains is 30 to 300 μm, and the injection pressure of the compressed air is 0.3 to 1.5 MPa. ~ 5. The method for cutting a high-strength fiber sheet according to any one of the above.
7. The high-strength fiber sheet is a non-woven fabric or woven fabric of borosilicate glass fiber.
The hole diameter of the nozzle is 0.3 to 1.5 mm, the diameter of the abrasive grains is 30 to 300 μm, and the injection pressure of the compressed air is 0.3 to 1.5 MPa. ~ 5. The method for cutting a high-strength fiber sheet according to any one of the above.
8. It is a cutting device for high-strength fiber sheets formed in the form of sheets, which are made of high-strength fibers for forming fiber-reinforced plastics.
A tank for storing abrasive grains and
A mixing unit connected to the tank and mixing the abrasive grains supplied from the tank with compressed air,
A nozzle that is connected to the mixing section and injects compressed air containing abrasive grains,
A net-like base on which the high-strength fiber sheet is placed is provided.
By injecting compressed air containing abrasive grains from the nozzle toward the high-strength fiber sheet placed on the base, the nozzle is moved so as to trace the contour of a predetermined shape of the sheet to be produced. A device for cutting a high-strength fiber sheet, which comprises cutting the high-strength fiber sheet into the predetermined shape.
9. A pressurized air passage for supplying compressed air into the tank is connected to the upper part of the tank, and the inside of the tank is opened to the atmosphere in the pressurized air passage when the supply of compressed air is stopped. The above 8. The high-strength fiber sheet cutting device described in.
10. 8. The above-mentioned 8. Or 9. The high-strength fiber sheet cutting device described in.
11. The tank is provided with a vibrator that applies vibration to the tank. ~ 10. The high-strength fiber sheet cutting device according to any one of.
12. The tank, the mixing portion, and the cutter head provided with the nozzle are movable along the mounting surface of the base by a linear motion mechanism, and the linear motion mechanism includes a mechanism portion and the mechanism portion. 8. A supporting base, a stretchable cover for covering the mechanism portion between the base, and a blower for supplying air into the base and the space covered by the cover. ~ 11. The high-strength fiber sheet cutting device according to any one of.

According to the present invention, it is a method for cutting a high-strength fiber sheet made of high-strength fibers for forming fiber-reinforced plastic and formed in a sheet shape, and compressed air containing abrasive grains is transferred from a nozzle to the high-strength fiber sheet. By moving the nozzle so as to trace the contour while injecting toward the fiber, the high-strength fiber sheet placed on the net-like base is cut into a predetermined shape, so that each fiber of the high-strength fiber sheet is cut. It can be cut instantly by blowing abrasive grains in compressed air, does not require large-scale processing equipment, and forms a high-strength fiber sheet, which is a reinforcing material for FRP, in a flexible shape at low cost. be able to. In addition, there is no fraying of the cut end. Further, since it can be oriented in any direction by using a small nozzle, the degree of freedom of processing can be increased, and it is easy to incorporate it into an NC processing device or a robot. Further, by placing it on a net-like base, the injected compressed air is released to the lower part of the base, so that the abrasive grains in the injected compressed air cut the reinforcing material fibers, and then the subsequent abrasive grains are used. It is possible to obstruct the flow and prevent the disconnection from becoming stagnant. In addition, it is possible to prevent the high-strength fiber sheet being cut from moving due to the wind pressure of the compressed air and cutting an erroneous portion.
When the base has a width of 1300 to 2000 mm, an opening of 6 to 15 mm, and a wire diameter of 1.5 to 2.5 mm, the base easily supports the injected compressed air while supporting the high-strength fiber sheet. You can escape. Further, since the base is not easily damaged by the abrasive grains, it is possible to prevent the base from rattling and cutting an erroneous portion.

The high-strength fiber contains one of borosilicate glass, carbon, boron and aromatic polyamide fibers (polyparaphenylene terephthalamide fiber), and the abrasive grain is at least one of glass powder and alumina. When the above is included, the abrasive grains can be selected and cut according to the hardness and density of the high-strength fiber. As a reinforcing material usually used for FRP, a high-strength fiber sheet such as glass, carbon, or boron can be cut to form a reinforcing material for FRP having a desired shape.
Further, when the high-strength fiber sheet is a woven fabric or a non-woven fabric of the high-strength fiber, it can be cut regardless of the composition and structure of the fiber.
Further, when a plurality of the high-strength fiber sheets are stacked and cut at the same time, the cutting by the abrasive grains does not apply a force in the surface direction to the high-strength fiber sheets, so that the cutting efficiency can be improved without causing misalignment. can.

Further, even when a plurality of high-strength fibers are laminated and formed, the fibers can be cut without causing any misalignment between the layers while being placed on a smooth base.
In addition, the ends cut by the abrasive grains do not fray the fibers that occur at the ends in the conventional cutting method using scissors or blades, and the directionality of the fibers is stable, so the strength is increased. It is possible to form a high-quality high-strength fiber sheet without damaging it. This is because, in the conventional cutting method, a moment generated by the movement accompanying the cutting is applied to the fiber, and the fraying progresses due to the moment, whereas in the present invention, there is no moment due to the movement and the fraying does not occur. ..
Further, since cutting can be easily performed without using a sharp blade or the like, not only the burden on the operator can be reduced, but also the safety of the operator can be enhanced.

The high-strength fiber sheet is a plain woven carbon fiber, the pore diameter of the nozzle is 0.3 to 1.5 mm, the diameter of the abrasive grains is 30 to 300 μm, and the injection pressure of the compressed air is 0. When it is 3 to 1.5 MPa, a high-strength fiber sheet for forming FRP using carbon fiber can be efficiently and high-qualityly cut.
The high-strength fiber sheet is a non-woven fabric or woven fabric of borosilicate glass fiber, the pore diameter of the nozzle is 0.3 to 1.5 mm, the diameter of the abrasive grains is 30 to 300 μm, and the compressed air is used. When the injection pressure is 0.3 to 1.5 MPa, a high-strength fiber sheet for forming an FRP using glass fiber can be efficiently and high-qualityly cut. Further, since the force applied to the high-strength fiber sheet during cutting is small, the high-strength fiber sheet does not move during cutting even when the high-strength fiber sheet is placed without being gripped and fixed. Therefore, a jig for gripping and fixing corresponding to high-strength fiber sheets having various shapes is not required, and a step for gripping is not required, so that cutting can be performed in a shorter time.

According to the present invention, it is a cutting device for a high-strength fiber sheet formed in a sheet shape, which is made of high-strength fibers for forming fiber-reinforced plastic, and is connected to a tank for storing abrasive grains and supplied from the tank. It is provided with a mixing section for mixing the abrasive grains and compressed air, a nozzle connected to the mixing section to inject compressed air containing the abrasive grains, and a net-like base on which a high-strength fiber sheet is placed. Then, while injecting compressed air containing abrasive grains from the nozzle toward the high-strength fiber sheet placed on the base, the nozzle is moved so as to trace the contour of a predetermined shape of the sheet to be produced, thereby achieving high strength. Cut the fiber sheet into a predetermined shape.
As a result, each fiber of the high-strength fiber sheet can be instantly cut by blowing abrasive grains in compressed air, eliminating the need for large-scale processing equipment, and for FRP at low cost and in any shape. A high-strength fiber sheet that is a reinforcing material can be formed. In addition, there is no fraying of the cut end. Further, since it can be oriented in any direction by using a small nozzle, the degree of freedom of processing can be increased, and it is easy to incorporate it into an NC processing device or a robot. Further, by placing it on a net-like base, the injected compressed air is released to the lower part of the base, so that the abrasive grains in the injected compressed air cut the reinforcing material fibers, and then the subsequent abrasive grains are used. It is possible to obstruct the flow and prevent the disconnection from becoming stagnant. In addition, it is possible to prevent the high-strength fiber sheet being cut from moving due to the wind pressure of compressed air and cutting an erroneous portion.

Further, when a pressurizing air passage is connected to the upper part of the tank and a purge valve is provided in the pressurizing air passage, compression from the pressurizing air passage is performed at the start of cutting of the high-strength fiber sheet. By pressurizing the upper space in the tank by supplying air, the abrasive grains can be quickly supplied from the tank to the mixing portion. Further, when the cutting of the high-strength fiber sheet is stopped, the upper space in the tank is opened to the atmosphere by the purge valve, so that the supply of abrasive grains from the tank to the mixing portion can be stopped quickly. As a result, production efficiency can be improved.

Further, when an air dryer for removing the moisture in the compressed air supplied to the mixing portion is provided, clogging of the abrasive grains in the tank can be suppressed even during long-term operation.

Further, when the tank is provided with a vibrator that applies vibration to the tank, it is possible to suppress clogging of abrasive grains in the tank even during long-term operation.

Further, the cutter head is movable along the mounting surface of the base by a linear motion mechanism, and the linear motion mechanism includes a mechanism portion, a base, and a cover, and the base and the said. When a blower that supplies air to the space covered by the cover is provided, the air supply by the blower pressurizes the inside of the space covered by the base and the cover, thereby improving the dust resistance of the mechanical part of the linear motion mechanism. Can be enhanced.

It is a schematic diagram which shows the example of cutting a high-strength fiber sheet by the cutting method which concerns on embodiment. FIG. 3 is a cross-sectional view taken along the line AA in FIG. It is a schematic diagram which shows the example which cuts the high-strength fiber sheet provided with a curved surface by the cutting method which concerns on embodiment. It is a schematic diagram which shows the example of the high-strength fiber sheet of a plain weave roving cloth. It is a top view which shows the example of the base in which the wire mesh is fixed to the frame. It is a side view which shows the example of the base in which the wire mesh is fixed to the frame base. It is an image which shows the example which cut the high-strength fiber sheet of a chopped strand mat by an abrasive grain. It is an image which shows the example which cut the high-strength fiber sheet of a roving cloth by an abrasive grain. It is a schematic diagram which shows the example which cuts the high-strength fiber sheet shown in FIG. 4 by the conventional method. It is an image which shows the example which cut the high-strength fiber sheet of a chopped strand mat by a conventional method. It is an image which shows the example which cut the high-strength fiber sheet shown in FIG. 4 by the conventional method. It is a top view of the cutting apparatus of the high-strength fiber sheet which concerns on embodiment. It is an arrow view of XIII of FIG. It is an arrow view of XIV of FIG. FIG. 14 is an enlarged view of a main part of FIG. It is explanatory drawing for demonstrating the tank which constitutes the said cutting apparatus. It is explanatory drawing for demonstrating the linear motion mechanism which comprises the said cutting apparatus.

The matters shown here are for illustrative purposes and embodiments of the present invention, and are the most effective and effortless explanations for understanding the principles and conceptual features of the present invention. It is stated for the purpose of providing what seems to be. In this regard, it is not intended to show structural details of the invention beyond a certain degree necessary for a fundamental understanding of the invention, and some embodiments of the invention are provided by description in conjunction with the drawings. It is intended to clarify to those skilled in the art how it is actually realized.

<How to cut high-strength fiber sheet>
The method for cutting a high-strength fiber sheet according to the present embodiment is a method for cutting a high-strength fiber sheet (1) made of high-strength fibers (2) for forming fiber reinforced plastic (FRP) and formed in a sheet shape. Then, while injecting compressed air (6) containing abrasive grains from the nozzle (5) toward the high-strength fiber sheet (1), the nozzle (5) is moved so as to trace the contour of the base (4). ), The high-strength fiber sheet (1) is cut into a predetermined shape (see, for example, FIGS. 1 and 2). Here, cutting includes drilling.

Generally, FRP is formed by impregnating high-strength fibers with unsaturated polyester resin, epoxy resin, etc. as a reinforcing material. The method for cutting this high-strength fiber sheet targets a high-strength fiber sheet (1) formed in a sheet shape using high-strength fibers as a reinforcing material for FRP. The material of the high-strength fiber (2) is not particularly limited, and examples thereof include fibers using borosilicate glass, boron, silicon carbide, alumina, carbon, and aramid.

The high-strength fiber sheet (1) is formed in a sheet shape using the high-strength fiber (2), and serves as a reinforcing material for FRP. Specific examples thereof include high-strength fiber sheets processed into a sheet shape using borosilicate glass fiber, carbon fiber, boron fiber and the like. The shape, size, thickness, etc. of the high-strength fiber sheet (1) are not particularly limited, and may be appropriately selected according to the target FRP. An example of this is a high-strength fiber sheet having a thickness of 0.1 to 1 mm.
The high-strength fiber sheet (1) may be processed into a shape including a curved surface. Further, the high-strength fiber sheet (1) can be formed by laminating a plurality of layers of high-strength fibers.
Further, the structure and structure of the high-strength fiber sheet (1) may be a woven fabric of high-strength fibers or yarn obtained by twisting them, or they may be bonded or entangled without being woven or knitted. It may be a non-woven fabric. Specific examples thereof include woven fabrics such as roving cloth and non-woven fabrics such as chopped strand mats. Further, the weaving method of the woven fabric is not particularly limited, and examples thereof include a woven fabric in which a plurality of warp and wefts are arranged by plain weave (see FIG. 4).

The high-strength fiber sheet (1) is cut while being placed on a net-like base (4) whose lower portion is open. The base (4) can discharge compressed air (6) from the base surface by providing a large number of voids in a net shape. The material and basis weight of the base (4) can be appropriately selected, and for example, a stainless steel wire mesh can be used. By making it made of stainless steel, it can be made hard, it is difficult to sink when the high-strength fiber sheet (1) is placed, and the cutting accuracy can be maintained. Further, as an example of the wire mesh, it can be mentioned that the shape is a rhombic mesh, the opening is 6 to 15 mm, and the wire diameter is 1.5 to 2.5 mm. By using a wire mesh (45) having such a size, in the injection of compressed air having a cutting allowance of 1 to 3 mm, even if the injected compressed air is sprayed on the wire mesh, it can escape to the opposite side. It is possible to prevent the injected compressed air from bouncing off the wire and spraying on the high-strength fiber sheet (1), causing the high-strength fiber sheet (1) to move and shifting the cutting position. The shape of the wire mesh is not limited to the rhombus and may be square.
Further, the wire mesh (45) is fixed to the frame base (42). The frame base (42) has a rectangular shape with a length and width of 1000 to 2500 mm (for example, length and width of 1200 mm and 2000 mm), and a metal support material (44) having a width of 30 mm and a height of 60 mm is arranged vertically and horizontally in the frame. The wire mesh is screwed to the frame and the support material (see, for example, FIGS. 5 and 6). Further, a dust collector (47) can be provided below the wire mesh (45). The dust collector (47) is provided with a hopper (48) that is open upward, and by sucking and collecting the abrasive grains in the compressed air used for cutting, the abrasive grains are scattered during the work. Can be prevented. Further, the abrasive grains after being sprayed on the high-strength fiber sheet (1) can be moved downward by suction, and the abrasive grains stay in the vicinity of the high-strength fiber sheet, thereby hindering the subsequent spraying of the abrasive grains. However, it is possible to prevent the visibility of the high-strength fiber sheet from being lowered and the workability from being lowered.

The abrasive grains are selected according to the high-strength fiber (2) to be cut. The material of the abrasive grains is not particularly limited, but a material having a hardness equal to or higher than the hardness of the high-strength fiber (2) to be cut can be used as a good example. Examples of the abrasive grains include glass powder (for example, soda-lime glass), alumina and the like. Further, the particle size of the abrasive grains is not limited, and can be, for example, about 30 to 300 μm.

The material, shape, etc. of the nozzle (5) for injecting the compressed air (6) containing the abrasive grains toward the high-strength fiber sheet (1) are not particularly limited, and a range in which the cutting allowance is 1 to 3 mm is preferable. .. The hole diameter of the nozzle may be appropriately selected according to the abrasive grains serving as the cutting allowance and the injection pressure. For example, the hole diameter of the nozzle (5) is preferably about 0.3 to 1.5 mm. The nozzle (5) can be easily attached to an NC device, a robot arm, or the like, and the nozzle (5) can be moved with high accuracy. Further, the nozzle 5 may be provided on a traveling body capable of self-propelling on the high-strength fiber sheet (1). Further, it is also possible for the operator to easily process the nozzle (5) by holding it by hand.
The injection pressure of the compressed air (6) may be set according to the hardness, thickness, etc. of the abrasive grains and the high-strength fiber sheet (1). For example, the injection pressure can be about 0.3 to 1.5 MPa. However, when the operator holds the nozzle (5) by hand, the injection pressure is preferably about 0.3 to 0.8 MPa. If it exceeds about 0.8 MPa, the position and direction of the nozzle (5) may shift due to the repulsive force accompanying the ejection.

1 and 2 show an example of cutting a high-strength fiber sheet (1) by this cutting method. In this example, the high-strength fiber sheet 1 in which a plurality of layers of the high-strength fibers 2 are laminated is placed on the base 4, and the compressed air 6 containing the abrasive grains is transferred from the nozzle 5 to the high-strength fiber sheet 1. It is jetted toward.
Then, the nozzle 5 can be cut into a predetermined shape by moving the nozzle 5 from one surface of the high-strength fiber sheet at a constant speed so as to trace the contour of the shape for cutting the high-strength fiber sheet 1. The injected compressed air 6 cuts each high-strength fiber 2 constituting the high-strength fiber sheet 1 and is discharged from the opening 46.
Not limited to moving the nozzle for cutting, the nozzle may be held in a fixed position to move the high-strength fiber sheet 1, or the nozzle 5 and the high-strength fiber sheet 1 may be moved at the same time. May be. The moving direction of the nozzle 5 and the high-strength fiber sheet 1 is not particularly limited, and can be any direction.
As shown, it is preferable that the nozzle 5 injects compressed air 6 from the normal direction of the surface of the high-strength fiber sheet 1. The distance between the nozzle 5 and the high-strength fiber sheet 1 and the relative moving speed of the nozzle 5 are determined by the material, density, etc. of the target high-strength fiber 2, the structure, number of layers, thickness, etc. of the high-strength fiber sheet 1. It can be appropriately set according to the injection pressure of the abrasive grains and the like.
The distance from the nozzle (5) to the surface of the high-strength fiber sheet (1) can be, for example, 5 mm to 15 mm. If it is less than 5 mm, the abrasive grains or the like rebounded from the high-strength fiber sheet (1) tend to come into contact with the nozzle (5), and the nozzle (5) tends to deteriorate. Further, if it exceeds 15 mm, the cutting allowance is widened and it becomes difficult to perform appropriate cutting.
The moving speed of the nozzle (5) is not particularly limited, but can be, for example, 60 mm / sec or less (preferably 50 mm / sec or less). If it exceeds 60 mm / sec, cutting residue may occur, which is not preferable.

Further, as shown in FIG. 3, when the whole or a part of the high-strength fiber sheet 1 is formed of a curved surface, the nozzle is oriented so as to be in the normal direction with respect to the cutting position of the high-strength fiber sheet 1. It is preferable to maintain 5. The direction of injection from the nozzle 5 does not necessarily have to be the normal direction with respect to the high-strength fiber sheet 1. Even if the nozzle 5 is not in the normal direction of the high-strength fiber sheet 1, cutting is possible by appropriately setting the direction of the nozzle 5, the moving speed, the injection pressure, and the like.

A specific example of cutting a high-strength fiber sheet by a method of cutting a high-strength fiber sheet for this fiber-reinforced plastic will be described.
A high-strength fiber sheet 1 (thickness 2.8 mm) made by stacking four high-strength fibers 2 made of a glass mat (product name EMC450), which is a chopped strand mat with a unit weight of 450 g / m ^{2, is fixed to the base 4.} Installed without any. As shown in FIGS. 5 and 6, the base 4 has an aluminum alloy frame 42 having a length and width of 1200 mm and 2000 mm, an opening screwed to the frame 42 of 10 mm, and a wire diameter of 2 mm. It is equipped with a diamond-shaped stainless steel wire mesh 45. Further, below the wire mesh 45, the opening 46 between the lines is open except for the portion supported by the frame 42 and the support member 44. Further, the base 4 is provided with a nozzle 5 having a nozzle diameter of 1.2 mm that moves in the vertical and horizontal directions by rails provided in the vertical and horizontal directions. The nozzle 5 can be moved in an arbitrary direction by a sequencer or the like, and the opening of the nozzle can be controlled. Further, a dust collector 47 is provided below the wire mesh 45. The dust collector 47 includes a hopper 48 that is open upward.

Then, as shown in FIGS. 1 and 2, compressed air containing glass beads having an average particle size of 50 μm as abrasive grains is ejected from the nozzle 5 at an injection pressure of 0.6 MPa, and high-strength fibers are ejected at a moving speed of 45 mm / sec. Sheet 1 was cut. Further, the abrasive grains were sucked and collected by the dust collector 47. As shown in FIG. 7, the cut high-strength fiber sheet 1 could be cut without fraying of the end portion 11.

^{Further, even when a roving cloth (product name WR570) having a unit weight of 570 g / m 2} is used as the high-strength fiber sheet 1, the cut end portion 11 can be cut without fraying as shown in FIG. did it.

On the other hand, when the high-strength fiber sheet 1 was cut using a cutting blade 8 which is a commercially available cutter knife as shown in FIG. 9, a large fray 18 was formed at the cut end portion 11 as shown in FIGS. 10 and 11. The thickness of the end portion 11 was increased as compared with the other portions.

<High-strength fiber sheet cutting device>
The high-strength fiber sheet cutting device according to the present embodiment is made of high-strength fiber (2) for forming fiber reinforced plastic (FRP) and is formed in a sheet shape, for example, as shown in FIGS. 12 to 14. A cutting device (10) for a high-strength fiber sheet (1), which is a tank (12) for storing abrasive grains (7) and an abrasive grain (7) connected to the tank (12) and supplied from the tank (12). ) And the mixing section (13) that mixes the compressed air (6), the nozzle (5) that is connected to the mixing section (13) and ejects the compressed air (6) containing the abrasive grains (7), and the high-strength fiber sheet. It is provided with a net-like base (4) on which (1) is placed. Then, for example, as shown in FIGS. 1 and 2, the compressed air (6) containing the abrasive grains (7) is placed on the base (4) from the nozzle (5) onto the high-strength fiber sheet (1). The high-strength fiber sheet (1) is cut into a predetermined shape by moving the nozzle (5) so as to trace the contour of the predetermined shape of the sheet to be produced while injecting the sheet toward the surface. Here, cutting includes drilling.

The cutting device (10) is suitably used, for example, in the method for cutting a high-strength fiber sheet according to the above embodiment.
In the present cutting apparatus (10), each configuration described in the above cutting method (for example, fiber reinforced plastic (FRP), high-strength fiber (2), high-strength fiber sheet (1), abrasive grains (7)) , Compressed air (6), etc.) can be applied.

The shape, size, material, etc. of the tank (12) are not particularly limited. A pressurizing air passage (21) for supplying compressed air (6) for pressurizing the inside of the tank (12) is connected to the upper part of the tank (12), for example, as shown in FIGS. 15 and 16. The pressurizing air passage (21) may be provided with a purge valve (22) that opens the inside of the tank (12) to the atmosphere when the supply of the compressed air (6) is stopped.
In this case, for example, an air passage (23) for supplying compressed air (6) is connected to the mixing portion (13), and an open / close valve (24) for opening and closing the passage is provided in the air passage (23). The pressurized air passage (21) is branched from the downstream side of the open / close valve (24) of the air passage (23), and the air passage (23) is opened when the high-strength fiber sheet (1) is cut. In addition, the inside of the tank (12) is closed to the atmosphere, the air passage (23) is closed when the cutting of the high-strength fiber sheet (1) is stopped, and the inside of the tank (12) is opened to the atmosphere. , The control unit (9) for controlling the on-off valve (24) and the purge valve (22) can be provided.

The tank (12) may be provided with, for example, a vibrator (29) that applies vibration to the tank (12). Examples of the vibrator (29) include a linear type and a rotary type. Of these, a linear type vibrator is preferable from the viewpoint of the vibration property of the tank. Further, the vibrator (29) may be operated constantly or intermittently, for example, when the high-strength fiber sheet (1) is cut.

The mixing form, placement location, etc. of the mixing portion (13) are not particularly limited. In the mixing portion (13), for example, as shown in FIG. 16, one end side is connected to an air passage (23) for supplying compressed air (6), and the other end side is connected to a nozzle (5) by piping. (25) may be provided, and a connecting passage (26) connecting the lower portion in the tank (12) and the mixing passage (25) may be provided. Further, the mixing passage (25) may be connected to, for example, a pressurizing pipe (27) extending to the upper part in the tank (12).
The mixing portion (13) may be connected to the bottom of the tank (12) by piping, for example, but it is preferable that the mixing portion (13) is integrally provided at the bottom of the tank 12 from the viewpoint of mixing property and compactness.

The structure, size, etc. of the nozzle (5) are not particularly limited. As the nozzle (5), for example, the configuration of the nozzle (5) described in the method for cutting a high-strength fiber sheet according to the above embodiment can be applied.

The structure, size, etc. of the base (4) are not particularly limited. As the base (4), for example, the configuration of the base (4) described in the method for cutting a high-strength fiber sheet according to the above embodiment can be applied.

As the cutting device (10), for example, as shown in FIGS. 13 and 16, a mode including an air dryer (32) for removing water in the compressed air (6) supplied to the mixing unit (13) can be mentioned. Be done. Examples of the air dryer (32) include an adsorption type, a membrane type, a freezing type and the like.

As the cutting device (10), for example, as shown in FIG. 17, the cutter head (15) provided with the tank (12), the mixing unit (13) and the nozzle (5) has a linear motion mechanism (51, 52). The linear motion mechanism (51, 52) includes a mechanism portion (54) and a base (56) that supports the mechanism portion (54). A blower (59) comprising an extendable cover (59) that covers the mechanism portion (54) between the base (56) and the base (56) and a blower that supplies air into the space covered by the base (56) and the cover (59). A form comprising 61) can be mentioned. Examples of the mechanism portion (54) of the linear motion mechanism (51, 52) include a ball screw mechanism, a rack and pinion mechanism, a belt mechanism, a cylinder mechanism, and the like.

Hereinafter, the cutting device 10 for the high-strength fiber sheet will be described more specifically.
As shown in FIGS. 12 to 14, the cutting device 10 is connected to a tank 12 for storing the abrasive grains 7 and a mixing unit 13 for mixing the abrasive grains 7 supplied from the tank 12 and the compressed air 6. A nozzle 5 that is connected to the mixing unit 13 and injects compressed air 6 containing abrasive grains 7 and a net-like base 4 on which the high-strength fiber sheet 1 is placed are provided. The cutter head 15 is composed of the tank 12, the mixing unit 13, and the nozzle 4. The cutter head 15 includes a cover 16 that covers the tank 12 and the mixing portion 13 (see FIG. 15).

As shown in FIG. 16, the tank 12 includes a container-shaped main body 12a having an upper opening and a lid 12b detachably attached to the main body 12a so as to close the opening of the main body 12a. The main body 12a is made of a transparent or translucent material (specifically, a resin) so that the inside can be visually recognized. Further, a pressurizing air passage 21 for supplying compressed air 6 into the tank 12 is connected to the upper part of the tank 12 (specifically, the lid body 12b). The pressurizing air passage 21 is provided with a purge valve 22 that opens the inside of the tank 12 to the atmosphere when the supply of the compressed air 6 is stopped.

The mixing portion 13 is provided with a mixing passage 25 having one end connected to an air passage 23 for supplying compressed air 6 and the other end being connected to a nozzle 5 by piping, and the lower part of the tank 12 and the mixing passage 25. There is a communication passage 26 for connecting the above. In this mixing passage 25, a reduced diameter portion 25a is provided at the connecting portion (or its vicinity) of the connecting passage 26. As a result, the abrasive grains 7 in the tank 12 and the compressed air 6 flowing through the mixing passage 25 are effectively mixed by the Venturi effect. Further, a pressurizing pipe 27 extending to the upper part in the tank 12 is connected to the mixing passage 25 on the downstream side of the connection portion with the connecting passage 26. The pressurizing pipe 27 exerts a function of supplying compressed air to the upper part of the tank 12 to pressurize the upper part of the tank 12 when the compressed air 6 is supplied from the air passage 23 to the mixing portion 13. Further, the tank 12 is provided with a linear vibrator 29 that applies vibration to the tank 12 (see FIG. 15).

The air passage 23 is provided with an opening / closing valve 24 that opens and closes the passage. The pressurizing passage 21 branches from the downstream side of the opening / closing valve 24 of the air passage 23. Further, a well-known air booster 31 is provided on the upstream side of the opening / closing valve 24 of the air passage 23. Further, an adsorption type air dryer 32 is provided on the upstream side of the air booster 31 of the air passage 23. A plurality of the air dryers 32 are provided, and compressed air is sent to each air dryer 32 in a predetermined order. Further, the upstream end side of the air passage 23 is connected to the compressor (that is, factory air) 33.

The nozzle 5 is provided on the cutter head 15 so that the compressed air 6 including the abrasive grains 7 is ejected toward the high-strength fiber sheet 1 on the base 4 (see FIG. 13). The hole diameter of the nozzle 5 is 0.3 to 1.5 mm. Further, the distance between the tip of the nozzle 5 and the surface of the high-strength fiber sheet 1 is 5 mm to 15 mm.

The base 4 can discharge the compressed air 6 from the surface of the base 4 by providing a large number of voids in a net shape (see FIGS. 1, 2, and 5). The base 4 includes a stainless steel wire mesh 45 and a frame base 42 to which the wire mesh 45 is attached. The wire mesh 45 has an opening of 6 to 15 mm and a wire diameter of 1.5 to 2.5 mm. Further, a metal support member 44 that supports the wire mesh 45 is arranged on the frame base 42. Further, below the wire mesh 45, a dust collector 47 for sucking and collecting the abrasive grains 7 is provided. The dust collector 47 includes a hopper 48 that opens toward the wire mesh 45.

As shown in FIG. 17, the cutter head 15 is movable in the horizontal direction along the mounting surface of the base 4 by the first linear motion mechanism 51 and the second linear motion mechanism 52 arranged orthogonally to each other. ing. Each of these linear motion mechanisms 51 and 52 expands and contracts to cover the mechanism portion 54 between the mechanism portion (specifically, the ball screw mechanism) 54 driven by the motor 55, the base 56 supporting the mechanism portion 54, and the base 56. It is equipped with a possible cover (specifically, a bellows cover) 59. The base 55 is provided with a rail 58 for guiding the slider 57 slid by the mechanism portion 54. Further, a cutter head 15 is attached to the slider 57 of the first linear motion mechanism 51. Further, one end side of the base 56 of the first linear motion mechanism 51 is attached to the slider 57 of the second linear motion mechanism 52. Further, the covers 59 are provided on both sides in the sliding direction with the slider 57 interposed therebetween.

The cutting device 10 includes a blower 61 that supplies air into the space covered by the base 56 and the cover 59 (see FIG. 14). The blower 61 also supplies air into the space covered by the base 53a constituting the guide mechanism 53 and the expandable cover (specifically, the bellows cover) 53b. Further, the other end side of the base 56 of the first linear motion mechanism 51 is attached to the slider 53c constituting the guide mechanism 53.

The cutting device 10 includes a control unit 9 having a CPU (for example, ROM, RAM, etc.), an input / output circuit, etc. (not shown). The control unit 9 is electrically connected to the on-off valve 24, the purge valve 22, the motor 54 of each of the linear motion mechanisms 51 and 52, the vibrator 29, the dust collector 47, the blower 61, and the like, and drives each device. To control.

Next, the operation and effect of the cutting device 10 having the above configuration will be described.
At the start of cutting the high-strength fiber sheet 1 in the cutting device 10, the air passage 23 is opened and the inside of the tank 12 is closed to the atmosphere by the opening / closing control of the opening / closing valve 24 and the purge valve 22. Then, as shown by the solid arrow in FIG. 16, the upper space in the tank 12 is pressurized by the supply of the compressed air 6 from the pressurizing air passage 21 and the pressurizing pipe 27. In this state, the abrasive grains 7 supplied from the tank 12 and the compressed air 6 supplied from the air passage 23 are mixed and sent to the nozzle 5 in the mixing unit 13, and the first and second linear motion mechanisms 51 are used. , 55 drive control causes the cutter head 15 to move horizontally along the mounting surface of the base 4.
As a result, the nozzle 5 traces the contour of the predetermined shape of the sheet to be produced while injecting the compressed air 6 including the abrasive grains 7 from the nozzle 4 toward the high-strength fiber sheet 1 placed on the base 4. It is moved and the high-strength fiber sheet 1 is cut into a predetermined shape.
During the cutting of the high-strength fiber sheet 1, the dust collector 47, the blower 61, the vibrator 29, and the like are operated.

On the other hand, when the cutting of the high-strength fiber sheet 1 in the cutting device 10 is stopped, the opening / closing control of the opening / closing valve 24 and the purge valve 22 closes the air passage 23 and opens the inside of the tank 12 to the atmosphere. Then, as shown by the broken line arrow in FIG. 16, the air in the upper space of the tank 12 is exhausted, and the supply of the compressed air 6 including the abrasive grains 7 to the nozzle 5 is stopped.

From the above, according to the cutting device 10 for the high-strength fiber sheet, the tank 12 for storing the abrasive grains 7 and the mixing unit 13 for mixing the abrasive grains 7 supplied from the tank 12 and the compressed air 6 connected to the tank 12. A nozzle 5 that is connected to the mixing unit 13 and injects compressed air 6 containing abrasive grains 7 and a net-like base 4 on which the high-strength fiber sheet 1 is placed are provided. Then, while injecting compressed air 6 containing the abrasive grains 7 from the nozzle 5 toward the high-strength fiber sheet 1 placed on the base 4, the nozzle 5 is moved so as to trace the contour of a predetermined shape of the sheet to be produced. The high-strength fiber sheet 1 is cut into a predetermined shape.
As a result, each fiber of the high-strength fiber sheet 1 can be instantly cut by blowing the abrasive grains 7 in the compressed air 6, no large-scale processing equipment is required, and a low-cost, flexible shape can be obtained. It is possible to form a high-strength fiber sheet 1 which is a reinforcing material for FRP. In addition, there is no fraying of the cut end. Further, since the small nozzle 5 can be oriented in any direction, the degree of freedom of processing can be increased, and it is easy to incorporate it into an NC processing device or a robot. Further, by placing the compressed air 6 on the net-like base 4, the injected compressed air 6 is released below the base 4, so that the abrasive grains 7 in the injected compressed air 6 cut the reinforcing material fibers, and then the reinforcing material fibers are cut. It is possible to prevent the cutting from stagnation by obstructing the flow of the subsequent abrasive grains 7. Further, it is possible to prevent the high-strength fiber sheet 1 being cut by the wind pressure of the compressed air 6 from moving to cut an erroneous portion.

Further, in the present cutting device 10, a pressurizing air passage 21 is connected to the upper part of the tank 12, and a purge valve 22 is provided in the pressurizing air passage 21. As a result, at the start of cutting the high-strength fiber sheet 1, the upper space in the tank 12 is pressurized by the supply of compressed air from the pressurizing air passage 21, so that the abrasive grains are pressed from the tank 12 to the mixing portion 13. 7 can be supplied quickly. Further, when the cutting of the high-strength fiber sheet 1 is stopped, the upper space in the tank 12 is opened to the atmosphere by the purge valve 22, so that the supply of the abrasive grains 7 from the tank 12 to the mixing portion 13 can be quickly stopped. As a result, production efficiency can be improved.

Further, the cutting device 10 includes an air dryer 32 for removing the moisture in the compressed air 6 supplied to the mixing unit 13. As a result, clogging of the abrasive grains 7 in the tank 12 can be suppressed even during long-term operation.
Further, in the cutting device 10, the tank 12 is provided with a vibrator 29 that applies vibration to the tank 12. As a result, clogging of the abrasive grains 7 in the tank 12 can be suppressed even during long-term operation.

Further, in the present cutting device 10, the cutter head 15 is movable along the mounting surface of the base 4 by the linear motion mechanisms 51 and 52, and the linear motion mechanisms 51 and 52 are the mechanism unit 54. It includes a base 56, a cover 59, and a blower 61 that supplies air into the space covered by the base 56 and the cover 59. As a result, the air supplied by the blower 61 pressurizes the space covered by the base 55 and the cover 59, thereby enhancing the dust resistance of the mechanical portions 54 of the linear motion mechanisms 51 and 52.

It should be noted that the present invention is not limited to the embodiments shown above, and various modifications can be made within the scope of the present invention according to the purpose and use.

1; High-strength fiber sheet, 11; Edge, 2; High-strength fiber, 4; Base, 42; Frame base, 44; Support material, 45; Wire mesh, 46; Opening, 47; Dust vacuum cleaner, 48; Hopper 5, Nozzle, 6; Compressed air, 8; Cutting blade.

Claims (12)

A method for cutting a high-strength fiber sheet made of high-strength fibers for forming fiber-reinforced plastic and formed in the form of a sheet.
The nozzle was placed on a net-like base by moving the nozzle so as to trace the contour of a predetermined shape of the sheet to be produced while injecting compressed air containing abrasive grains from the nozzle toward the high-strength fiber sheet. A method for cutting a high-strength fiber sheet, which comprises cutting the high-strength fiber sheet into the predetermined shape. The method for cutting a high-strength fiber sheet according to claim 1, wherein the base is a stainless steel wire mesh having an opening of 6 to 15 mm and a wire diameter of 1.5 to 2.5 mm. The high-strength fiber contains one of borosilicate glass, carbon and boron.
The method for cutting a high-strength fiber sheet according to claim 1 or 2, wherein the abrasive grains contain at least one of glass powder and alumina. The method for cutting a high-strength fiber sheet according to any one of claims 1 to 3, wherein the high-strength fiber sheet is a woven fabric or a non-woven fabric of the high-strength fiber. The method for cutting a high-strength fiber sheet according to any one of claims 1 to 4, wherein a plurality of the high-strength fiber sheets are stacked and cut at the same time. The high-strength fiber sheet is a plain woven fabric made of carbon fiber.
Any of claims 1 to 5, wherein the hole diameter of the nozzle is 0.3 to 1.5 mm, the diameter of the abrasive grains is 30 to 300 μm, and the injection pressure of the compressed air is 0.3 to 1.5 MPa. A method for cutting a high-strength fiber sheet described in Crab. The high-strength fiber sheet is a non-woven fabric or woven fabric of borosilicate glass fiber.
Any of claims 1 to 5, wherein the hole diameter of the nozzle is 0.3 to 1.5 mm, the diameter of the abrasive grains is 30 to 300 μm, and the injection pressure of the compressed air is 0.3 to 1.5 MPa. A method for cutting a high-strength fiber sheet described in Crab. It is a cutting device for high-strength fiber sheets formed in the form of sheets, which are made of high-strength fibers for forming fiber-reinforced plastics.
A tank for storing abrasive grains and
A mixing unit connected to the tank and mixing the abrasive grains supplied from the tank with compressed air,
A nozzle that is connected to the mixing section and injects compressed air containing abrasive grains,
A net-like base on which the high-strength fiber sheet is placed is provided.
By injecting compressed air containing abrasive grains from the nozzle toward the high-strength fiber sheet placed on the base, the nozzle is moved so as to trace the contour of a predetermined shape of the sheet to be produced. A device for cutting a high-strength fiber sheet, which comprises cutting the high-strength fiber sheet into the predetermined shape. A pressurizing air passage for supplying compressed air into the tank is connected to the upper part of the tank.
The high-strength fiber sheet cutting device according to claim 8, wherein the pressurizing air passage is provided with a purge valve that opens the inside of the tank to the atmosphere when the supply of compressed air is stopped. The high-strength fiber sheet cutting device according to claim 8 or 9, further comprising an air dryer for removing moisture in compressed air supplied to the mixing section. The high-strength fiber sheet cutting device according to any one of claims 8 to 10, wherein the tank is provided with a vibrator that applies vibration to the tank. The tank, the mixing portion, and the cutter head provided with the nozzle are movable along the mounting surface of the base by a linear motion mechanism.
The linear motion mechanism includes a mechanism portion, a base that supports the mechanism portion, and a stretchable cover that covers the mechanism portion between the bases.
The high-strength fiber sheet cutting device according to any one of claims 8 to 11, further comprising a blower for supplying air into the space covered with the base and the cover.

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