JPH09277177A - Rotary tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the binding strength of inorganic long fibers bound to each other, and prevent the occurrence of a vertical split by braiding the fiber bundle of the inorganic long fibers to a braid body. SOLUTION: Inorganic long fibers 1 are bound to each other, using a thermosetting resin binder. The fiber bundles 2 of the inorganic long fibers 1 are braided to a rod-like braid body 3, and worked via the fiber end 4 of each inorganic long fiber 1 exposed from the end of the braid body 3. In this case, the inorganic long fibers are used by a capacity percentage between 30vol.% to 75vol.%. Furthermore, a material having relative machinability for a workpiece may be used as the inorganic long fiber 1. In the case of a grinding work, for example, a material is not specifically limited, so long as the material is harder than a grinding object and brittle, but the use of alumina fiber, boron fiber, silicon carbide fiber, silicon nitride fiber, glass fiber or the like is preferable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary tool used for performing processing such as drilling and polishing on a metal or non-metal workpiece.

[0002]

2. Description of the Related Art Conventionally, as a rotary tool of this type, FIG.
As shown in FIG. 1, inorganic long fibers a such as alumina long fibers aligned in one direction are bound with a thermosetting resin binder such as an epoxy resin, and formed into a desired shape such as a round bar. There is known a rotary tool which performs processing such as perforation and polishing at the fiber end b.

[0003]

However, in the case of the conventional rotary tool, since the aligned long fibers are only arranged along the direction of the rotation axis, for example, a tube made in this manner is used. In the case of round or ring-shaped rotary tools, vertical cracks occur immediately after use, making them useless, and the same applies to rod-shaped rotary tools. If too much force is applied to the rotary tool, the rotary tool may crack even in the case of a rod.
This is an important problem to be solved for a rotary tool using an inorganic long fiber as a grinding element and a polishing element. In particular, it is desired to develop a rotary tool having high strength that can withstand high-speed rotation.

[0004]

Therefore, in order to eliminate the disadvantages of the conventional rotary tool, the rotary tool of the present invention binds the inorganic long fibers with a thermosetting resin binder, and In the rotary tool, the fiber bundle of the inorganic long fibers is knitted into a braided body. The rotary tool according to claim 2 is characterized in that the fiber bundle of the inorganic long fibers is knitted into a rod-shaped braid, and a core material made of the inorganic long fibers is provided along the rotation axis of the rod. And A rotary tool according to a third aspect of the invention is characterized in that the fiber bundle of the inorganic long fibers is knitted into a tubular hollow braid. The rotary tool according to a fourth aspect of the present invention is characterized in that the inorganic long fiber is any one of alumina fiber, boron fiber, silicon carbide fiber, silicon nitride fiber, and glass fiber, or a combination thereof. A rotary tool according to a fifth aspect of the invention is characterized in that the inorganic long fibers are 30 to 75% by volume.

The inorganic long fibers may be any material having workability relatively to the material to be processed. For example, in the case of polishing, a material that is harder and more brittle than the material to be polished is preferable. Although not limited, it is preferable to use alumina fibers, boron fibers, silicon carbide fibers, silicon nitride fibers, glass fibers, etc., as described above. In particular, when the material to be polished is aluminum, copper or brass, glass fiber is most suitable, and when the material is iron or the like, alumina fiber is suitable. Further, these may be mixed depending on the material to be polished.

As the inorganic long fibers, single fibers having an average fiber diameter of about 3 to 40 μm are used.
m is preferable. This is an inorganic filament
The thinnest fiber currently available as yarn is 3 μm
Also, if it exceeds 40 μm, handling becomes very difficult. However, in consideration of effective use in the grinding area beyond the polishing area, the average fiber diameter is 100 μm.
Fibers between m and 200 μm are ideal. Conversely, if the use in the polishing area is considered rather than the polishing, the finer the fiber, the better the average fiber diameter is 3 μm.

The fiber bundle of the inorganic long fibers has a fiber bundle weight of about 500 to 3000 tex. From the impregnating property of the resin, a plurality of thin fiber bundles of about 500 tex are impregnated into the resin and then aligned. It is ideal that the resin is impregnated, but when the impregnating property of the resin is good, it is also possible to impregnate the resin with a fiber bundle of 1500 tex or 3000 tex as it is.

The thermosetting resin, which is a binder for solidifying the inorganic filaments and is also a matrix of FRP constituting the rotary tool, includes epoxy resin, unsaturated polyester resin, vinyl ester resin, bismaleimide Resin, phenolic resin, etc. are used. In particular, a rotating tool that does not contain voids (bubbles) in spite of containing inorganic filaments can be produced and an epoxy resin having a strong adhesive force to the inorganic filaments is used. Optimal. If there is a void,
For example, metal particles generated during the polishing process enter voids remaining in the FRP material, causing clogging and damaging a surface to be polished having the same hardness as the metal particles during polishing.

The content of the inorganic long fibers is preferably 30 to 75% by volume. When the content is less than 30% by volume, the polishing effect is deteriorated. This is because cracks occur between the fibers and the fibers with a small force. In addition, from the viewpoint of the polishing effect of the rotary tool, it is better that the content of the fiber is large,
A range of volume% is preferred.

In order to obtain the above-mentioned rod-shaped or tubular rotary tool of the present invention, inorganic long fibers knitted into a braid body by a braiding machine and impregnated with a thermosetting resin are prepared, and this is used. It is drawn into a pipe or mold having an inner diameter of a predetermined size to be cured, or the inorganic long fibers impregnated with the thermosetting resin are continuously formed in a heating mold having holes of a predetermined size. It can be manufactured by so-called continuous pultrusion.

FIG. 1 shows an example of a rod-shaped rotary tool, in which a fiber bundle 2 of inorganic long fibers 1 is knitted into a rod-shaped braid 3, and fibers of each inorganic long fiber 1 appearing at the end of the braid 3. Edge 4
It is designed to be processed in. FIG. 2 shows another example of a rod-shaped rotary tool, in which a core material 5 in which fiber bundles 2 of inorganic long fibers 1 are aligned in one direction is provided along the rotary axis of the rotary tool. It is designed to increase strength. FIG. 3 shows an example of a cylindrical rotary tool,
The fiber bundle 2 of the inorganic long fibers 1 is knitted into a tubular braid body 3 and processed at the fiber ends 4 of the inorganic long fibers 1 appearing at the ends of the braid body 3.

The braided body made of the fiber bundle of the inorganic long fibers can be produced by an ordinary braiding device. That is, for example, 16
When using the braiding machine of the book hanging, the fiber bundle of the inorganic long fibers is wound around each of the 16 bobbins, and when this is attached to the braiding machine and activated, the 16 bobbins guide the braiding machine. The braid moves according to the rail, and the braids knitted according to the movement of the bobbin are continuously formed. The thickness of the braid can be adjusted depending on the thickness of the fiber bundle wound around the bobbin and the number of bobbins to be installed. In addition,
When a core material made of inorganic long fibers is provided along the center axis of the braid, that is, the rotation axis of the rotary tool, to increase the strength, when the braid is assembled from the fiber bundle of inorganic long fibers. Then, one or a plurality of fiber bundles or a core material made of the thin braid previously prepared may be put into the braid body while being inserted in the central portion.

There are two methods for obtaining the inorganic long fibers knitted into the braided body and impregnated with the thermosetting resin, as described below. That is, a fiber bundle of inorganic long fibers impregnated with a thermosetting resin is wound on a bobbin of a braiding machine,
There are a method of making a braided body using this, and a method of first making a braided body only with a fiber bundle of inorganic long fibers, and then immersing the braided body in a resin tank and impregnating it with a thermosetting resin. It is better to prepare the braided body from the fiber bundle of the inorganic long fibers first, and then impregnate the resin after that, from the time and effort of cleaning the braiding machine.

For more specific production, in the case of a rod-shaped rotary tool, a braided body impregnated with resin by previously adjusting the fiber content so that the fiber content is the volume% described above,
A rod-shaped rotary tool is completed by pulling it into a pipe or a mold having a predetermined inner diameter to cure it, then taking out the cured product from the pipe or the mold and cutting it into a predetermined size. Further, in the case of manufacturing using a continuous drawing device (pultrusion machine), the braided body impregnated with the resin is passed through a heating die having a hole of a predetermined size, and the braided body is continuously drawn. Forming into a rod-like body while curing,
If it is cut into a predetermined size, a rod-shaped rotary tool is completed.

Further, in the case of a cylindrical rotary tool, a hollow inorganic long fiber braided body impregnated with a resin is prepared and is made of metal having a predetermined inner diameter, ceramic, or plastic capable of withstanding heat. Insert a pipe or shaft (which is best made of iron and coated with a mold release agent) into the hollow part of this braid, cure it in that state, and pull out the pipe or shaft that becomes the core after curing to make it hollow. A tubular rotary tool is completed by producing a tubular body of and cutting it into a predetermined size. If the outer diameter of the braid is finished by a lathe or the like before pulling out the pipe or shaft to be the core, post-processing is not required after pulling out the core, which is preferable in the manufacturing process.

An embodiment of the rotary tool of the present invention will be described below. (Example 1) A fiber bundle of alumina fibers consisting of 1000 filaments of 9 μm each was used, which was wound on 16 bobbins and hung on a braiding machine.
A rod-shaped braided body was produced while arranging a fiber bundle of alumina fibers composed of 00 filaments as a core material. This braided body was placed in a resin bath containing a resin composition having the following mixing ratio to impregnate the resin. Epoxy resin (DER383J Dow Chemical) 100 parts Tetrahydromethylphthalic anhydride (HN2200) 80 parts Imidazole (2E4MZ-CN Shikoku Kasei) 1 part The braided body impregnated with the resin thus obtained has an inner diameter of 2.5 mm and a length. It was drawn into a 15 cm pipe and cured in that state in a curing oven at 120 ° C. After curing,
The braided body in the pipe was pulled out to obtain a rod-shaped body having a diameter of 2.5 mm. This rod-shaped body was finished by a lathe to have an outer diameter of 2 mm and cut into a length of 30 mm to produce a polishing rotary tool. When this rotary tool for polishing was attached to a rotary drill and an iron mold was polished, a very good polished surface could be obtained. The rotary tool could be used without cracking until it was abraded by grinding.

(Example 2) Three alumina filaments each consisting of 1000 filaments of 9 μm were combined into a filament bundle of 3000 filaments, which was wound on 16 bobbins and hung on a braiding machine to form a braided body. It was made. This braided body was put in the above resin composition and impregnated with a resin, which was drawn into a pipe with a hole having a diameter of 3 mm and cured to prepare a rod-shaped body having an outer diameter of 3 mm. This rod is 30m long
A rotary tool for polishing was produced by cutting into m. When this polishing rotary tool was attached to a rotary drill and an iron mold was polished in the same manner as in Example 1, a very good polished surface could be obtained. The rotary tool could be used without cracking until it was abraded by grinding.

(Embodiment 3) Alumina fibers consisting of 1000 filaments of 9 μm each were used, two of them were combined, wound on 16 bobbins, and hung on a braiding machine to form a tubular shape with a hollow portion. A braided body was produced. This braided body was put in a resin bath having the same resin composition as in Example 1 and impregnated with a resin, and then an iron rod having an outer diameter of 4.5 mm having a surface coated with a release agent was applied to the hollow portion of the braided body. After being inserted, it was placed in a curing oven in that state and cured. After finishing the outer diameter to 6 mm with a lathe in this state, pull out the iron rod of the core and finish it to an inner diameter of 4.5 mm and an outer diameter of 6 mm.
It cut to 0 mm and obtained the cylindrical rotary tool. When this cylindrical rotary tool was attached to a rotary drill and the surface of the iron plate was polished, a good polished surface could be obtained. Also in this case, the rotary tool could be used without being cracked until it was abraded by abrasion.

[0019]

As described above, according to the present invention, in the rotary tool in which the inorganic long fibers are bound by the thermosetting resin binder and processed at the fiber ends of the inorganic long fibers, the inorganic long fibers are used. Since the fiber bundle of is knitted into a braided body,
It is possible to obtain a rotary tool in which the binding strength between the inorganic long fibers is increased, vertical cracks do not occur, and there is no risk of breaking during rotation.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a rotary tool of the present invention.

FIG. 2 is a perspective view of another embodiment of the rotary tool of the present invention.

FIG. 3 is a perspective view of another embodiment of the rotary tool of the present invention.

FIG. 4 is a perspective view of a conventional rotary tool.

[Brief description of reference numerals]

 1 inorganic long fiber 2 fiber bundle 3 braided body 4 fiber end 5 core material

Claims (5)

[Claims] 1. A rotary tool in which inorganic long fibers are bound with a thermosetting resin binder and processed at the fiber ends of the inorganic long fibers, wherein a fiber bundle of the inorganic long fibers is knitted into a braided body. A rotating tool that is characterized. 2. The fiber bundle of inorganic long fibers is knitted into a rod-shaped braid, and a core material made of inorganic long fibers is provided along the rotation axis of the rod. Rotary tool. 3. The rotary tool according to claim 1, wherein the fiber bundle of the inorganic long fibers is knitted into a tubular hollow braid. 4. The inorganic long fiber is any one of alumina fiber, boron fiber, silicon carbide fiber, silicon nitride fiber and glass fiber, or a combination thereof, according to any one of claims 1 to 3. The rotating tool described in. 5. The rotary tool according to claim 1, wherein the inorganic long fibers are 30 to 75% by volume.