JP2000280179A - Grinding rotary tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the loading while improving rigidity so as to prevent the generation of breakdown during the use by including a specified wt.% of abrasive grains in the resin matrix, and setting the bending strength and bending elasticity at a specified value or more. SOLUTION: A grinding rotary tool is obtained by impregnating the matrix resin 4 including the abrasive grains 3 in fiber bundle 2 of the inorganic long fibers 1 having a circular cross section and aligned into the bar-like shape, and hardening it. Cross sectional shape of the rotary tool can be formed into a desirable shape such as an elliptic shape, triangle shape, square shape, hexagonal shape, besides a circular shape. Quantity of blending of the abrasive grains is necessary to be restricted to a small quantity such as about 20 wt.%. Bending strength of this rotary tool is set at 450 Mpa or more, and bending elasticity thereof is set at 50 Gpa or more. As a resin matrix, thermosetting resin such as phenol resin, epoxy resin, polyimide resin, polymaleimide resin, unsaturated polyester resin is desirably used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary tool for polishing, and more particularly to a soft rotary tool that can be polished without damaging the work, and the tip of the rotary tool can be formed into an arbitrary shape according to the shape of the work. It can be processed, is tough, can be used without breaking during use, has no clogging, and has an HRC50
The present invention relates to a rotary tool for polishing capable of polishing a work such as a high-hardness steel, a cemented carbide, or a difficult-to-cut material.

[0002]

2. Description of the Related Art Conventionally, as a rotary tool for polishing, for example, JP-A-2-232174 and JP-A-9-277 have been disclosed.
No. 177, a resin matrix inorganic long fiber composite grindstone formed by combining inorganic long fibers as a polishing element with a resin matrix, or a diamond-grain and a metal binder. A round bar-shaped metal bond grindstone, an electrodeposited diamond grindstone with a shaft, and the like are known.

[0003]

In the case of the resin matrix inorganic long fiber composite grindstone, the feeling of use is soft and the work can be polished without damaging the work by compounding the inorganic long fiber and the resin matrix. The tip part can be machined into any shape according to the shape of the work, and it has toughness and has extremely excellent characteristics that it can be used without breakage during use. It was impossible to grind a work such as a hard alloy or a difficult-to-cut material. In the case of a metal-bonded grindstone or a diamond electrodeposited grindstone with a shaft, a work with an HRC of 50 or more can be polished. However, the grindstone itself is too hard, causing damage to the work. It is difficult to shape the tip, and it is easy to break during use.
In addition, it has the disadvantage of clogging,
Further, the life of the electrodeposited diamond grinding wheel with a shaft was very short. Therefore, the present invention provides an advantage of the resin matrix inorganic long fiber composite grindstone, which has a soft feeling of use and can be polished without damaging the work, and the tip of the rotary tool can be formed into any shape according to the shape of the work. Workability of HRC50 or more like metal bond grindstone or diamond electrodeposition grindstone with shaft is maintained while maintaining extremely excellent characteristics that it can be machined, and it is strong and can be used without breaking during use and without clogging. It is an object of the present invention to provide a polishing rotary tool capable of polishing.

[0004]

In order to achieve the above object, a rotary tool for polishing according to the present invention has a structure in which inorganic long fibers are disposed in a resin matrix in the direction of a rotation axis and formed into a rod-shaped body having an arbitrary cross-sectional shape. A polishing rotary tool, characterized in that the matrix contains abrasive grains in an amount of 5 to 20 wt%, and has a bending strength of 450 Mpa or more and a flexural modulus of 50 Gpa or more. Further, the polishing rotary tool according to claim 2 is the polishing rotary tool according to claim 1, wherein the inorganic long fiber is at least one of alumina fiber, carbon fiber, silicon carbide fiber, and silicon nitride fiber. Features. The polishing rotary tool according to claim 3 is the polishing rotary tool according to claim 1 or 2, wherein the abrasive grains are diamond abrasive grains, CBN abrasive grains, boron carbide abrasive grains, silicon carbide abrasive grains, and alumina. It is characterized by being at least one of high quality abrasive grains. The polishing rotary tool according to claim 4 is the polishing rotary tool according to any one of claims 1 to 3, wherein the resin matrix is formed of a phenol resin, an epoxy resin, a polyimide resin, a polymaleimide resin, or a non-woven resin. It is a saturated polyester resin. The rotary tool for polishing according to claim 5 is:
The polishing rotary tool according to any one of claims 1 to 4, wherein the abrasive grains are attached to the surface of a UD prepreg sheet of inorganic long fibers, and thereafter, are obtained by being wound into a rod shape. Features. According to a sixth aspect of the present invention, there is provided a rotating rotary tool according to the fifth aspect, wherein an arrangement direction of the inorganic long fibers constituting the prepreg UD sheet is made to coincide with an axial direction of the rod-shaped body. And In addition, the polishing rotary tool according to claim 7 provides a polishing tool according to claim 5.
In the rotary tool for polishing described above, an arrangement direction of the inorganic long fibers constituting the UD prepreg sheet is shifted from an axial direction of the rod-shaped body. The rotating tool for polishing according to claim 8 is characterized in that, in the rotating tool for polishing according to claim 5, the abrasive grains are not attached to the winding end side of the UD prepreg sheet. A polishing rotary tool according to a ninth aspect of the present invention is the polishing rotary tool according to any one of the first to fourth aspects, wherein the inorganic long fiber is a hollow braid having an inorganic long fiber disposed as a core in a hollow portion. It is characterized by consisting of.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The inorganic long fibers used preferably have an elastic modulus of 100 Gpa or more, and particularly preferably 1
It is preferably at least 50 Gpa, and more specifically, it is preferable to use alumina fiber, carbon fiber, silicon carbide fiber, silicon nitride fiber or the like. In addition, if the bending strength of the obtained rotary tool is 450 Mpa or more and the bending elastic modulus is 50 Gpa or more, it is optional to include glass fiber or the like as the inorganic long fiber.

In the rotary tool for polishing according to the present invention, the abrasive grains include diamond abrasive grains, CBN abrasive grains,
Abrasive grains having high hardness such as boron carbide abrasive grains and silicon carbide abrasive grains are suitable, and of course, alumina abrasive grains,
Zirconia-alumina abrasive grains, zirconia-based abrasive grains and the like are used. Further, titanium carbide, carbide such as tungsten carbide, boron nitride, nitride such as titanium nitride, zirconium boride, titanium boride, powder such as boride such as tungsten boride, or silicon carbide, silicon nitride, Whiskers such as magnesium oxide, aluminum borate, potassium titanate, and alumina can also be used. The size of the abrasive grains can be added in the range of # 60 to # 200,000. The blending amount is 5-20 wt%
It is necessary to keep it to a small amount.

The resin matrix is preferably made of a thermosetting resin such as a phenol resin, an epoxy resin, a polyimide resin, a polymaleimide resin, and an unsaturated polyester resin.

In order to obtain a rotary tool for polishing using these constituent materials, for example, inorganic long fibers are aligned in an appropriate arrangement direction to form a rod-shaped fiber bundle or a braided body, which is bonded by a matrix resin. In a manufacturing process for forming a rotary tool having an arbitrary shape, a matrix resin containing abrasive grains is used as the matrix resin, whereby the rotary tool can be easily manufactured. The impregnation of the matrix resin into the inorganic long fibers may be performed before or after the formation into the fiber bundle or the braided body, or may be performed after being formed into the shape of the final rotating tool. It can be impregnated in stages. The polishing rotary tool shown in FIG. 1 is obtained by impregnating and hardening a matrix resin 4 containing abrasive grains 3 into a fiber bundle 2 of inorganic long fibers 1 aligned in a rod shape having a true circular cross section. Things. The cross-sectional shape of the rotary tool is not limited to a perfect circle, but may be any shape such as an elliptical shape, a triangular shape, a square shape, and a hexagonal shape.

Further, abrasive grains 3 are adhered to the surface of the UD prepreg sheet 5 of the inorganic filament 1, and a plurality of the prepreg sheets 5 are laminated, heated and pressed to form a block. It can also be obtained by cutting a rotary tool of any shape from the block. The rotary tool for polishing shown in FIG. 2 is obtained by cutting out a rod having a true circular cross section.

Alternatively, as shown in FIGS. 3 and 4, the abrasive grains 3 are adhered to the surface of the UD prepreg sheet 5 of the inorganic long fiber 1, and then the prepreg sheet 5 is wound into a rod, heated and pressed. It can also be obtained by molding. In this case, as shown in FIG. 3, when the arrangement direction of the inorganic long fibers 1 constituting the UD prepreg sheet 5 is made to coincide with the axial direction of the rod-shaped material, a material having a large bending strength can be obtained. As shown in FIG. 4, when the arrangement direction of the inorganic long fibers 1 constituting the UD prepreg sheet 5 is shifted from the axial direction of the rod-shaped material, a material having high flexibility is obtained although the bending strength is reduced.

As shown in FIG. 5, when the abrasive grains 3 are adhered to the prepreg sheet 5, the abrasive grains 3 are adhered to the wrapping end side of the prepreg sheet 5 which is located on the outer peripheral side when wound in a rod shape. By not allowing the abrasive grains 3 to exist only on the center portion side of the rod-like body and not allowing the abrasive grains 3 to exist on the outer peripheral side, it is possible to form in this case,
The processing apparatus can be prevented from being unnecessarily damaged during the centerless processing. Further, by winding the UD prepreg sheet around a shaft, it can be easily formed as a tool with a shaft.

As shown in FIGS. 3 to 5, the rotary tool formed by winding the UD prepreg sheet into a rod as described above has a spiral end face formed by the UD prepreg sheet and the abrasive layer at its end face. Has appeared, and when using this rotary tool, the abrasive layer will fluctuate in a spiral state in the entire region of the end face with the rotation of the rotary tool,
It is possible to polish the entire area including the center of the contact surface of the rotary tool.

Further, as shown in FIG. 6, a hollow braided body 6 may be formed by the inorganic long fibers 1 and a core 7 made of the inorganic long fibers 1 may be disposed in the hollow portion. In this case, it is possible to use a core formed as a braided body. Also, for example, by attaching abrasive grains only to the core material and forming a layer containing no abrasive grains on the outer peripheral side, a pull-trusion machine at the time of molding or a processing device at the time of centerless processing is unnecessary. It can be intact.

[0014]

Embodiments of the present invention will be described below. (Example 1) Alumina fiber having a monofilament diameter of about 10 μm (Al 2 O 3: 85 wt%, SiO 2: 15
(wt%) was prepared, and 23 of these fiber bundles were aligned and placed in a resin bath containing an abrasive-containing resin composition having the following composition to be impregnated with the resin. Epoxy resin (DER383J Dow Chemical Japan) 100 parts by weight Tetrahydromethyl phthalic anhydride (HN2200 Hitachi Chemical) 80 parts by weight Imidazole (2E4MZ-CN Shikoku Chemicals) 1 part by weight Alumina abrasive # 400 (Fujimi Incorporation) 100 parts by weight This fiber bundle has a length of 1 with a through hole having a diameter of 3.6 mm.
Then, the mixture was heated to 160 ° C. through a pultrusion mold having a length of 20 m / m and continuously extracted at a speed of 20 cm / min while being cured. The obtained rod-shaped body was cut into 100 mm and made into a true circular rod-shaped body having a diameter of 3 mm with a centerless polishing machine.
Furthermore, it was cut to a length of 50 mm to obtain a rotary tool for polishing.

The bending strength of the obtained rotary tool is 480MP.
a, The flexural modulus was 55 GPa. Further, the total content of the fibers and the abrasive grains was about 75 wt% (calcination analysis at 600 ° C. for 30 minutes). From this, the weight composition ratio of fiber: abrasive: resin was calculated to be 100: 22.5: 40.8, and the abrasive content was 13.8 wt%. Next, this polishing rotary tool was attached to a rotary drill, and the number of rotation was 30,000 r.
pm, dry, NAK80 (pre-hardened steel, HRC4
0), the initial surface roughness Ra was 1.
A 2 μm surface could be finished to 0.4 μm in 10 minutes.

(Comparative Example 1) A rotary tool was prepared under the same conditions except that no alumina abrasive was added to the resin composition in Example 1, and the same workpiece was subjected to a polishing test under the same conditions using the rotary tool. . The fiber content of this rotary tool is 74
wt%, flexural strength 1030 MPa, flexural modulus 72
GPa. The surface roughness Ra achieved by the same polishing treatment for 10 minutes as in Example 1 was 0.8 μm.

(Example 2) The diameter of the monofilament is 1
A yarn weight of 300 g / m2 and a thickness of 0.25 made of SiC fiber (manufactured by Nicalon Nippon Carbon Co., Ltd.) of 0 to 15 m.
mm, a 38% by weight UD prepreg sheet (the same composition as in Example 1 but without abrasive grains) was cut into a fiber longitudinal direction of 200 mm and a width of 35 mm, and CBN abrasive grains (170 (No. -200) 0.5 g was uniformly adhered, rounded so that the abrasive layer was on the inside, and applied with external pressure to form a rod shape. The fiber direction was the same as the axial direction of the rod. This was put in a 170 ° C. oven and cured for 1 hour to obtain a rod having a diameter of 3.2 mm and a length of 200 mm. The rod-shaped body was finished with a centerless polishing machine to obtain a perfect circular rod-shaped body having a diameter of 3 mm, and cut into a length of 50 mm to obtain a rotary tool for polishing.

When the strength of the obtained rotary tool was measured, the bending strength was 1190 MPa and the flexural modulus was 84 GP.
a. In addition, the total content of fibers and abrasive grains is about 74w
t%. From this, the weight composition ratio of fiber: abrasives: resin was calculated to be 100: 23.8: 43.5, and the abrasive content was 14.2 wt%. Next, this rotary tool was attached to a rotary drill, and a polishing test of a cemented carbide V3 (HRA88) was performed by a wet method at a rotation speed of 30000 rpm. As a result, there was no clogging during use, and Ra was 0.4 μm in 10 minutes. Rmax could be finished to 4.5 μm.

Example 3 When knitting a hollow braid with a glass fiber bundle, a core material to be inserted into a hollow portion of the braid is as follows.
The same alumina fiber bundle as in Example 1 was impregnated with the same resin composition as in Example 1 (excluding the abrasive grains), and then the diamond-like abrasive grains (170-20) were applied to the adhesive surface.
Fifteen fiber bundles 30 g with abrasive grains to which No. 0) were attached were prepared. Abrasion rate is about 2 parts per 100 parts by weight of fiber.
2 parts by weight. Next, a glass fiber bundle (G37 1 /
33.8S Unitika Yumgrass) is wound on a bobbin of 16 weights at 30 m each and hung on a braiding machine.
The core material is put together and one end is inserted from below the center opening of the table of the braiding machine, and pulled up at the same time as the glass fiber braid knitted by this braiding machine. I got a body. This braided body was impregnated with resin by passing it through a resin bath containing the same resin composition as that obtained by impregnating the core material, and a rod-like body was formed under the same conditions using the same pultrusion mold as in Example 1. , Same centerless processing, outer diameter 3mm, length 50m
m of rotating tools for polishing were obtained.

The bending strength of this rotary tool is 1050MP
a, The flexural modulus was 75 GPa. The total content of the fibers and abrasive grains was about 75 wt%. Thus, the weight composition ratio of fiber: abrasives: resin is 100: 22: 40.7.
And the abrasive content was 13.5 wt%. Attach this rotary tool to a rotary drill, and rotate at 30,000.
When a polishing test was performed on cemented carbide V3 (HRA88) at a rpm of 1 mm and wet, no clogging occurred during use, and the surface having an initial surface roughness Ra of 1.3 μm and an Rmax of 11 μm was 1 mm.
In 0 minutes, it was possible to finish Ra to 0.3 μm and Rmax to 4.9 μm.

(Comparative Example 2) A polishing test of the same work was performed under the same conditions using an electrodeposited diamond grindstone with a shaft (No. 200, tip diameter 3 mm) instead of the rotating tools of Examples 2 and 3. The surface roughness achieved by the polishing treatment for 10 minutes was 0.7 μm for Ra and 9.5 μm for Rmax. In addition, scratches were observed on the polished surface. Further, in the latter half of polishing, slight clogging was observed. Thereafter, when the polishing was further continued, the clogging was clearly observed, and no improvement in the surface roughness was observed.

[0022]

As described above, according to the present invention, the usability is soft, the work can be polished without damaging the work, and the tip of the rotary tool can be machined into an arbitrary shape according to the shape of the work. A polishing rotary tool that is tough, can be used without breakage during use, has no clogging, and can polish a workpiece such as a high-hardness steel having an HRC of 50 or more, a cemented carbide, or a difficult-to-cut material is obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a rotary tool for polishing of the present invention.

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

FIG. 3 is a perspective view showing still another embodiment of the rotary tool for polishing of the present invention.

FIG. 4 is a perspective view showing still another embodiment of the rotary tool for polishing of the present invention.

FIG. 5 is a perspective view showing one embodiment of a method of manufacturing a rotary tool for polishing according to the present invention.

FIG. 6 is a perspective view showing still another embodiment of the rotary tool for polishing of the present invention.

[Explanation of symbols]

 Reference Signs List 1 inorganic long fiber 2 fiber bundle 3 abrasive grain 4 matrix resin 5 prepreg sheet 6 hollow braided body 7 core material

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3C063 AA10 AB03 AB08 BB02 BB03 BB04 BB11 BB25 BC03 BG14 BG22 FF23

Claims (9)

[Claims] 1. A polishing rotary tool in which inorganic long fibers are arranged in a rotation axis direction in a resin matrix to form a rod-shaped body having an arbitrary cross-sectional shape, wherein said matrix contains abrasive grains in an amount of 5 to 20 wt%. Included, bending strength 450Mpa
As described above, a polishing rotary tool characterized by having a flexural modulus of 50 Gpa or more. 2. The polishing rotary tool according to claim 1, wherein the inorganic long fiber is at least one of alumina fiber, carbon fiber, silicon carbide fiber, and silicon nitride fiber. 3. The abrasive according to claim 1, wherein the abrasive is at least one of diamond abrasive, CBN abrasive, boron carbide abrasive, silicon carbide abrasive, and alumina abrasive. A rotary tool for polishing. 4. The polishing rotary tool according to claim 1, wherein the resin matrix is a phenol resin, an epoxy resin, a polyimide resin, a polymaleimide resin, or an unsaturated polyester resin. . 5. The method according to claim 1, wherein abrasive grains are adhered to the surface of the UD prepreg sheet of inorganic long fibers, and thereafter the rod is wound into a rod shape.
A rotary tool for polishing according to any one of the above. 6. The polishing rotary tool according to claim 5, wherein the arrangement direction of the inorganic long fibers constituting the UD prepreg sheet is made coincident with the axial direction of the rod-shaped body. 7. The polishing rotary tool according to claim 5, wherein the arrangement direction of the inorganic long fibers constituting the UD prepreg sheet is shifted from the axial direction of the rod. 8. The polishing rotary tool according to claim 5, wherein the abrasive grains are not attached to the end of winding of the UD prepreg sheet. 9. The polishing rotary tool according to claim 1, wherein the inorganic long fiber is formed of a hollow braided body having an inorganic long fiber disposed as a core in a hollow portion.