JP3710549B2 - Rotating tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary tool used to perform processing such as drilling and polishing on a metal or non-metal workpiece.
[0002]
[Prior art]
Conventionally, as this type of rotary tool, as shown in FIG. 4, inorganic long fibers a such as alumina long fibers aligned in one direction are bound with a thermosetting resin binder such as epoxy resin to form a round bar shape or the like. There is known a rotary tool that is formed into a desired shape and is processed such as drilling and polishing at the fiber end b of the inorganic long fiber a.
[0003]
[Problems to be solved by the invention]
However, in the case of the conventional rotary tool, since the aligned long fibers are arranged along the direction of the rotation axis, for example, in the case of a cylindrical or ring-shaped rotary tool made in this way Will cause a vertical crack immediately after use, and it will not be useful, and the same applies to rod-like rotary tools, but it depends on the adhesive strength of the resin, so if excessive force is applied during use Even in the case of rods, there is a risk of cracks in the rotating tool. This is an important issue to be solved for rotary tools that use inorganic long fibers as grinding and polishing elements, and in particular, the development of rotary tools with high strength that can withstand use at high speeds is desired.
[0004]
[Means for Solving the Problems]
Accordingly, the rotary tool of the present invention is 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 in order to eliminate the disadvantages of the conventional rotary tools. 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 a fiber bundle of the inorganic long fibers is knitted into a rod-like braided body and a core material made of inorganic long fibers is provided along the rotation axis of the rod-like body. And
The rotary tool according to claim 3 is characterized in that the inorganic long fiber bundle is knitted into a cylindrical hollow braid.
The rotary tool according to claim 4 is characterized in that the inorganic long fibers are any one of alumina fibers, boron fibers, silicon carbide fibers, silicon nitride fibers, and glass fibers, or a combination thereof.
Moreover, the rotary tool according to claim 5 is characterized in that the inorganic long fiber is 30 to 75% by volume.
[0005]
The inorganic long fiber is not particularly limited as long as it is a material having processability relative to the workpiece. For example, if it is a polishing process, the material is particularly limited if it is harder and more brittle than the material to be polished. Although it is not a thing, as above-mentioned, use of an alumina fiber, a boron fiber, a silicon carbide fiber, a silicon nitride fiber, a glass fiber, etc. is preferable. In particular, when the material to be polished is aluminum, copper, or brass, glass fiber is most suitable, and when it is iron or the like, alumina fiber is suitable. These may be mixed depending on the material to be polished.
[0006]
As the inorganic long fibers, those having an average fiber diameter of about 3 to 40 μm are used, and those having about 6 to 35 μm are preferable. This is because the thinnest fiber currently marketed as a yarn as an inorganic long fiber is 3 μm, and if it exceeds 40 μm, handling becomes very difficult. However, if effective utilization in the grinding region is considered beyond the polishing region, fibers having an average fiber diameter of 100 μm to 200 μm are ideal. On the other hand, if the use in the polishing region is considered rather than polishing, the thinner the better, the better the fiber with an average fiber diameter of 3 μm.
[0007]
In addition, the fiber bundle of the inorganic long fiber is used with a fiber bundle weight of about 500 to 3000 tex. From the impregnation property of the resin, a plurality of thin fiber bundles of about 500 tex are impregnated into the resin and used after being aligned. However, if the resin impregnation property is good, it is possible to impregnate the resin with a fiber bundle of 1500 tex or a fiber bundle of 3000 tex as it is.
[0008]
The thermosetting resin, which is a binder for solidifying the inorganic long fibers and is also a matrix of FRP constituting the rotary tool, includes epoxy resin, unsaturated polyester resin, vinyl ester resin, bismaleimide resin, phenol Resins etc. are used, and in particular, an epoxy resin that can produce a rotary tool that does not contain voids (bubbles) in spite of containing inorganic long fibers and has strong adhesion to inorganic long fibers is optimal. . If there is a void, for example, metal particles generated during the polishing process enter the voids remaining in the FRP material, causing clogging and damaging the surface to be polished having the same hardness as the metal particles during polishing. It will be.
[0009]
The content of the inorganic long fiber is preferably 30 to 75% by volume, and if it is less than 30% by volume, the polishing effect is deteriorated. This is because a crack is generated with a little force. In view of the polishing effect of the rotary tool, the fiber content should be large, and the range of 55 to 65% by volume is preferable.
[0010]
In order to obtain a rod-like or cylindrical rotary tool as described above according to the present invention, an inorganic long fiber knitted into a braided body with a braiding machine and impregnated with a thermosetting resin is prepared, and this is a predetermined size. It is drawn into a pipe or mold having an inner diameter of 2 mm and cured, or the inorganic long fiber impregnated with the thermosetting resin is continuously passed through a heating mold provided with holes of a predetermined size. By making it, it can manufacture by what is called continuous drawing (pultrusion).
[0011]
FIG. 1 shows an example of a rod-like rotary tool, in which a fiber bundle 2 of inorganic long fibers 1 is knitted into a rod-like braided body 3, and the fiber ends 4 of the inorganic long fibers 1 appearing at the ends of the braided body 3. It is intended to be processed. FIG. 2 shows another example of a rod-like rotary tool. A core material 5 in which fiber bundles 2 of inorganic long fibers 1 are aligned in one direction is provided along the rotation axis of the rotary tool. The strength is increased. FIG. 3 shows an example of a cylindrical rotary tool. A fiber bundle 2 of inorganic long fibers 1 is knitted into a cylindrical braid body 3, and each inorganic long fiber 1 appearing at the end of the braid body 3 is shown in FIG. The fiber ends 4 are processed.
[0012]
A braided body composed of a bundle of inorganic long fibers can be produced by a normal braided device. That is, for example, when using a 16-placing braid machine, if a fiber bundle of inorganic long fibers is wound around each of the 16 bobbins, and this is attached to the braiding machine and activated, the 16 bobbins are It moves according to the guide rail of the braiding machine, and a braided body knitted according to the movement of the bobbin is continuously formed.
The thickness of the braided body can be adjusted by 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 central axis of the braided body, that is, the rotation axis of the rotary tool and the strength is to be further increased, the braided body is assembled from a fiber bundle of inorganic long fibers. At the time of going, it is only necessary to assemble one or a plurality of bundles of fiber bundles or a core material made of a thin braid previously prepared into a braid while putting it in the center.
[0013]
There are two methods for obtaining inorganic long fibers knitted into the braid and impregnated with a 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, and a braid is made using this, and a braid is first produced only with a fiber bundle of inorganic long fibers, Thereafter, there is a method in which this is immersed in a resin tank and impregnated with a thermosetting resin. From the trouble of cleaning the braiding machine, it is better to prepare a braided body first from a fiber bundle of inorganic long fibers, and then impregnate the resin afterwards.
[0014]
For more specific production, in the case of a rod-shaped rotary tool, a braided body that has been impregnated with resin by adjusting the amount of fibers so as to have a fiber content of volume% as described above has a predetermined inner diameter. The rod-shaped rotary tool is completed by drawing it into a pipe or mold having the mold and curing it, and then removing the cured product from the pipe or mold and cutting it into a predetermined dimension.
In the case of manufacturing using a continuous drawing machine (pultrusion machine), the braided body impregnated with the resin is passed through a heating mold having a hole of a predetermined size, and this is continuously applied. If it is formed into a rod-like body while being cured and cut to a predetermined size, a rod-like rotary tool is completed.
[0015]
In the case of a cylindrical rotary tool, a hollow inorganic long fiber braid body impregnated with a resin is prepared, and a pipe or shaft made of metal, ceramic, or plastic that can withstand heat has a predetermined inner diameter. (The best one is made of iron and with a release agent applied to the surface) is inserted into the hollow part of this braid body and cured in that state, and the pipe or shaft that becomes the core after curing is pulled out to form a hollow cylinder. If a body is produced and cut into predetermined dimensions, a cylindrical rotary tool is completed. If the outer diameter of the braid is finished with a lathe before pulling out the core pipe or shaft, post-processing is not required after the core is pulled out, which is preferable in the manufacturing process.
[0016]
Hereinafter, examples of the rotary tool of the present invention will be described.
(Example 1)
Each fiber bundle of alumina fibers consisting of 1000 μm filaments of 9 μm is used, wound on 16 bobbins and hung on a braiding machine, and further, the fiber bundle of alumina fibers consisting of 1000 μm filaments of 9 μm at the center. A rod-like braided body was produced while arranging as above. This braid was put into a resin bath containing a resin composition having the following blending ratio and impregnated with resin.
Epoxy resin (DER383J Dow Chemical) 100 parts Tetrahydromethyl phthalic anhydride (HN2200) 80 parts Imidazole (2E4MZ-CN Shikoku Kasei) 1 part It was drawn into a 15 cm pipe and cured in a 120 ° C. curing furnace in that state. 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 to an outer diameter of 2 mm by a lathe and cut to a length of 30 mm to produce a polishing rotary tool.
When this polishing rotary tool was attached to a rotary drill and an iron mold was polished, a very good polished surface could be obtained. Further, the rotary tool could be used without cracking until it was worn and separated by polishing.
[0017]
(Example 2)
Three alumina fibers each consisting of 1000 μm filaments of 9 μm were combined to form a fiber bundle of 3000 filaments, which were wound around 16 bobbins and hung on a braiding machine to produce a braided body. This braided body was put into the resin composition, impregnated with resin, drawn into a pipe having a hole with a diameter of 3 mm, and cured to produce a rod-shaped body with an outer diameter of 3 mm. This rod-shaped body was cut into a length of 30 mm to produce a polishing rotary tool.
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. Further, the rotary tool could be used without cracking until it was worn and separated by polishing.
[0018]
(Example 3)
Alumina fibers composed of 1000 μm filaments each having 9 μm were used, two of which were combined, wound around 16 bobbins, hung on a braiding machine, and a tubular braid having a hollow portion was produced. The braided body was put in a resin bath having the same resin composition as in Example 1, impregnated with resin, and then a steel rod having an outer diameter of 4.5 mm, in which a release agent was applied to the hollow portion of the braided body. It was inserted and placed in a curing furnace in that state to be cured. After finishing the outer diameter to 6 mm with a lathe in this state, the core iron rod was pulled out, finished to an inner diameter of 4.5 mm and an outer diameter of 6 mm, and cut to a length of 50 mm to obtain a 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 cracking until it was separated by wear.
[0019]
【The invention's effect】
Thus, according to the present invention, in 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, the fiber bundles of the inorganic long fibers are braided. Since the body is knitted, the binding strength between the inorganic long fibers is increased and vertical cracking does not occur, and a rotary tool that does not break during rotation can be obtained.
[Brief description of the drawings]
1 is a perspective view of an embodiment of the 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. Perspective view of the rotating tool
DESCRIPTION OF SYMBOLS 1 Inorganic long fiber 2 Fiber bundle 3 Braid body 4 Fiber end 5 Core material

Claims (5)

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 the fiber bundles of the inorganic long fibers are knitted into a braided body. Rotating tool. 2. The rotary tool according to claim 1, wherein the fiber bundle of the inorganic long fibers is knitted into a rod-like braided body, and a core material made of inorganic long fibers is provided along the rotation axis of the rod-like body. The rotary tool according to claim 1, wherein the fiber bundle of the inorganic long fibers is knitted into a cylindrical hollow braid. The rotary tool according to any one of claims 1 to 3, wherein 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. . The rotary tool according to any one of claims 1 to 4, wherein the inorganic long fiber is 30 to 75% by volume.

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