JPH09254037A - Lapping material and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable grinding in a part other than a tip face by orienting an inorganic long fiber in which thermosetting resin is impregnated with an angle so that an end face of the fiber appears on flat faces on a surface and a rear surface and the tip face of a molded body molded like a flat plate. SOLUTION: Sheetlike objects which are a binder which solidifies an inorganic long fiber 1 selected from among a group of glass, alumina, boron fiber and silicon carbide fiber which are pulled and arranged in one direction and in which thermosetting resin which is also a constituent material of matrix of a lapping material is impregnated are accumulated on the inorganic long fibers 1 in layer to thermoset them so as to obtain a block. This block is cut into slices in the shape of a flat plate by giving an angle for the direction of fiber so that a thick side of the block becomes flat face 2a, 2b side of a stick to be ground which is cut out. Consequently, an end face 1a of the inorganic long fiber 1 appears on the flat faces 2a, 2b on a surface and a rear surface and a tip face 2c of a molded body 2 like a flat plate, and grinding not only on the tip face 2c but also in the flat parts 2a, 2b becomes possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wrapping material suitable for use as a finishing material in the final step of a mold or the like.

[0002]

2. Description of the Related Art Conventionally, as a lapping material of this type, abrasive grains such as alumina and carborundum, which have been sieved according to the application, are sintered into a block by using a binder or the like, and a flat plate suitable for the application is obtained from this block. There is known a stick-shaped stick or the like which is cut into a desired shape and used.

[0003]

However, in the above-mentioned prior art, the wrapping material cut out from the block in the form of a flat stick or the like has a weak strength, particularly 1 mm to several meters.
With a flat stick having a thickness of about m, it is impossible to polish the surface of a mold or the like by applying a normal force, and there is a drawback that it breaks if a little excessive force is applied. Such a flat plate-like wrapping material having a thickness of 1 mm to several mm is
In particular, for finishing metal molds such as iron, it is indispensable depending on the shape of the mold, such as having grooves for thin ribs, but it is impossible to cover with conventional technology. there were.

As a method for solving this, Japanese Patent Laid-Open No. 1-22
In Japanese Patent No. 22865, long fibers made of a raw material (alumina, silicon carbide, etc.) that can be used as an abrasive, that is, alumina long fibers, silicon carbide long fibers, etc. are used while utilizing the strength of the fibers. Moreover, a method of making a polishing stick by utilizing the polishing performance of the material itself has been considered. That is, this is a method in which alumina long fibers, silicon carbide long fibers and the like impregnated with a thermosetting resin are aligned in one direction, and these are heated and pressed to be hardened to make a polishing block. The flat stick with a thickness of 1 mm to several mm cut out from this block has the fibers b aligned in the longitudinal direction of the stick a as shown in FIG. It is possible to polish the metal surface without the fracture surface of the tip c of the fiber b. Moreover, surprisingly, the stick a thus made has the resin completely filled in the gaps between the fibers b, b, and unlike the grindstone made by sintering, there is no void at all, so the stick a can be polished. It is possible. This is probably because there are no voids where shavings enter in the opposite direction, so that shavings do not enter the polishing surface during polishing and are completely discharged from the polishing surface. According to this method, the strength of the stick a is taken care of by the long fibers b, which is sufficient.

However, since the polishing can be performed only at the tip of the stick a, there is a drawback that the side surface of the stick a cannot be ground. For example, when polishing a mold with a stick a by hand, it is normal to increase the area to be abraded by stick a
Although the bending of the stick a is used to polish it by using the flank portion (flat portion) of the stick a, it is impossible to expect it from the stick a. That is, JP-A 1-22
The biggest problem of the stick according to Japanese Patent No. 2865 is that the side portion of the stick (flat portion) of the stick where the side surface portion of the fiber is exposed because the side portion of the fiber is not polished except for the tip portion of the fiber, and the side surface of the narrow groove for the rib of the mold. It had the drawback that it couldn't be polished.

[0006]

The wrapping material of the present invention is a wrapping material composed of a molded body obtained by impregnating inorganic long fibers with a resin in order to solve the above-mentioned inconvenience, and the inorganic long fibers are drawn in a plurality of directions. The feature is that they are arranged. The wrapping material according to a second aspect is characterized in that the inorganic long fibers are oriented at an angle in a plurality of directions. The lapping material according to claim 3 is
It is characterized in that the inorganic long fibers are crossed and oriented at symmetrical angles in two directions. A wrapping material according to a fourth aspect is characterized in that the inorganic long fibers are oriented at an angle of 7 to 20 degrees with respect to the flat surface. The wrapping material according to a fifth aspect is characterized in that the inorganic long fibers are inorganic long fibers selected from the group consisting of glass fibers, alumina fibers, boron fibers and silicon carbide fibers. A wrapping material according to a sixth aspect is characterized in that the inorganic long fibers are 30 to 75% by volume. Further, in the method for producing a wrapping material according to claim 7, the inorganic long fibers impregnated with the thermosetting resin are wound around the outer periphery of the rotating body while traversing the outer periphery thereof and wound on the rotating body. Cut the molding material taken in the axial direction of the rotating body, cut it open, spread it into sheets, stack multiple sheets if necessary, and heat and press to harden it to create a wrapping material block. It is characterized in that it is sliced into a flat plate shape so that the thick side of is a flat surface side.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The inorganic long fiber is not particularly limited as long as it is a material relatively abrasive to the material to be polished, that is, a material that is harder and more brittle than the material to be polished. No, but as mentioned above, glass fiber,
Alumina fibers, boron fibers, silicon carbide fibers and the like are preferably used. 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 fibers, single fibers having an average fiber diameter of about 3 to 40 μm are used, and those of about 6 to 35 μm are preferable. This is because the thinnest fiber currently commercially available as a yarn as an inorganic long fiber has a thickness of 3 μm, and when it exceeds 40 μm, the handling becomes very difficult. However, if we consider effective utilization in the grinding area beyond the polishing area, the average fiber diameter is 100 μm
A 200 μm fiber is ideal. Further, conversely, when considering utilization in the polishing region rather than polishing, the thinner the better, the better the fiber having the average fiber diameter of 3 μm. A fiber bundle having a weight of about 500 to 3000 Tex is used. From the viewpoint of resin impregnability, it is ideal that many thin fiber bundles of about 500 Tex are impregnated with resin and then aligned, but if the fiber impregnability is good, 1500 Tex
It is also possible to impregnate a resin with a fiber bundle of ex or a fiber bundle of 3000 Tex as it is.

The thermosetting resin that is a binder for hardening the inorganic long fibers and is also a constituent material of the matrix of the wrapping material is an epoxy resin, an unsaturated polyester resin, a vinyl ester resin, a bismaleimide resin, Phenol resin or the like is used, and in particular, an epoxy resin which is suitable for forming a wrapping material which does not contain voids (air bubbles) therein despite containing inorganic long fibers is most suitable. If there are voids, the metal particles generated as a result of polishing are FR
The voids remaining in the P material cause clogging, and during polishing, the surface to be polished having the same hardness as the metal particles is damaged.

As described above, the content of the inorganic long fibers is preferably 30 to 75% by volume, and when the content is less than 30% by volume, the polishing effect is deteriorated, and 75% by volume.
When the number of fibers exceeds the above range, the amount of resin is insufficient when the fibers are lined up, and when a stick having a thickness of about 1 mm is produced, vertical cracks are generated in the stick with a slight force. From the viewpoint of polishing efficiency of dies, it is better that the fiber content is high.
A range of 5 to 65% by volume is preferable.

As shown in FIG. 1, when the inorganic long fibers 1 are oriented at an angle such that the fiber end faces 1a appear on the front and back flat surfaces 2a, 2b and the front end surface 2c of the flat plate-shaped molded body 2, Unlike conventional lapping materials, it is possible to polish not only the tip surface 2c but also the flat surfaces 2a and 2b. If the inorganic long fibers 1 are oriented in a plurality of directions, for example, as shown in FIG. 2, the inorganic long fibers 1 are crossed and oriented at symmetrical angles in two directions, the strength of the wrapping material is increased, and The polishing direction is not limited to only one direction, and it is easy to use.

Further, the inorganic long fibers have an angle of 7 to 20 degrees with respect to the flat surface of the wrapping material, preferably 7 to 15 degrees.
It is preferable to orient at an angle of. According to the experiments conducted by the present inventor, if the angle is less than 7 degrees, for example, when a stick having a thickness of 1 mm is sliced and cut out from a pressed block, the fiber length across the thickness of the stick is 8.2 mm or more. The polishing efficiency at the flat part is significantly deteriorated as if the side surface of the fiber is almost exposed, and if it exceeds 20 degrees, for example, the thickness is 1 m.
This is because when the m-sized stick is sliced from a pressed block and cut out, the length of the fiber that crosses the thickness of the stick becomes 3 mm or less, and the bending strength of the stick becomes insufficient, so that the stick can be broken with a little force.

Regarding the production of the wrapping material of the present invention,
For example, in order to manufacture the wrapping material shown in FIG. 1, although not shown in particular, sheet-like materials obtained by impregnating thermosetting resin into inorganic long fibers aligned in one direction, for example, prepreg sheets are laminated and heat-cured. The block thus obtained can be obtained by slicing it into a flat plate so that the angle is formed with respect to the fiber direction and the thick side of the block is the flat surface side of the cut polishing stick.

Further, for example, in order to manufacture the wrapping material shown in FIG. 2, the inorganic long fibers 1 impregnated with a thermosetting resin as shown in FIG. The molding material 3 wound on the rotating body 10 is cut in the axial direction of the rotating body 10 as shown in FIG. If necessary, the molding material is laminated according to the thickness, placed in a heated mold, and cured by heating and pressing to form a wrapping material block 11 as shown in FIG. As shown in FIG. 2, by slicing into a flat plate shape so that the thick side of this block is the flat surface side of the cut out polishing stick, the front and back flat surfaces and the end surfaces of the inorganic long fibers are formed on the tip surfaces as shown in FIG. Is exposed It is possible to fabricate a Ikku. In this case, when the twill is wound around the outer periphery of the rotating body 10 and the traverse angle is made symmetrical with respect to the circumferential direction on the way to and from the traverse, the obtained stick 2 is flat when pushed or pulled during polishing. It is possible to obtain a product that can be polished in part.

The production method of the present invention is not limited to the above-mentioned one. For example, an inorganic long fiber sheet aligned in one direction and impregnated with a thermosetting resin is aligned in the other direction and thermoset. Laminate the resin-impregnated inorganic long-fiber sheet, then, similar to the above manufacturing method, cut into the size of the mold, if necessary laminate the molding material according to the thickness, put in a heated mold, heat The wrapping material block can be prepared by curing by pressing under pressure, and cut out from this block as a flat stick so that the end faces of the inorganic long fibers are exposed on the front and back flat surfaces and the tip end surface.

The fiber ends of the inorganic long fibers may be oriented so that the inorganic long fibers oriented in each direction are in the range of 7 to 20 degrees with respect to the flat surface of the polishing stick. In this case, if the lapping materials are oriented at symmetrical angles, the lapping material can be polished in both the pushing direction and the pulling direction. Further, in particular, the fibrous body laminated by the above-mentioned twilling does not cause delamination and is extremely excellent in strength.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described. (Example 1) First, a resin composition having the following mixing ratio was prepared. Epoxy resin (DER383J Dow Chemical) 100 parts Tetrahydromethylphthalic anhydride (HN2200 Hitachi Chemical) 80 parts Imidazole (2E4MZ-CN Shikoku Chemicals) 1 part Next, 1000 parts of the resin tank containing the resin composition is used.
Fiber diameter 15μm, 600Tex made of filament
The resin was impregnated through the alumina fiber of No. 6, and six of them were aligned and displaced in the circumferential direction by 4.5 mm per circumference in a cylinder of 11 cm in diameter, and reciprocated 9.5 times in parallel with a width of 27 cm. Then, this was cut open in the axial direction to prepare a sheet. This sheet is cut into a length of 31 cm with respect to the aligned fiber direction, and 31 cm x 27
cm sheet was prepared and heated to 125 ° C. 32
Put in a positive mold of 30 cm x 30 cm, 30 kg / c
It was pressurized at a pressure of m ² , held for 1 hour, and then taken out. The thus-prepared plate having a thickness of 6 mm was sliced with a diamond cutter into a width of 1 mm at an angle of 7 degrees with respect to the aligned fiber direction to prepare a polishing stick having a thickness of 1 mm and a width of 6 mm. In the case of this stick, the fibers make an angle of 7 degrees with respect to the surface of the flat portion (6 mm wide surface) of the stick. When the vertical surface of the mold was polished with the flat portion of this stick, it was possible to obtain a very good polished surface with very good polishing efficiency and no linear polishing scratches. The volume% of the alumina fibers in this stick was 60%.

Example 2 Using the same resin composition as in Example 1, 1000 filaments of alumina fibers having a fiber diameter of 25 μm and 500 Tex were passed through this resin composition to impregnate the resin. Three of these were aligned and wound in parallel with each other on the cylinder, not by parallel winding, but by winding at a traverse angle of 82.5 degrees with respect to the axial direction while shifting a width of 282 mm by 8.5 mm. As a matter of course, when it is wound to the right and then turned to be wound to the left, an angle of 82.5 degrees from the left axis (strictly -82.5
Degree). In this case, the entire surface was covered once by 6 reciprocations, but this was repeated 14 times, that is, 84 reciprocations, and then cut open in the axial direction to prepare a sheet. From this sheet, as in Example 1, length 31 cm, width 282
mm sheet was cut out and a cured plate having a thickness of 6.8 mm was produced in the same manner as in Example 1. Slices were cut from this plate in the longitudinal direction of the fibers to a width of 1 mm with a diamond cutter to prepare a stick having a thickness of 1 mm and a width of 6.8 mm. In the case of this stick, the fibers make an angle of 7.5 degrees with respect to the plane of the flat portion (6 mm wide surface) of the stick. When a polishing test was performed using this stick in the same manner as in Example 1, the polishing efficiency at the flat portion and the tip portion of the stick was very excellent, and an extremely good polished surface without polishing scratches could be obtained. The volume% of the alumina fiber of this stick was 64%.

[0019]

As described above, according to the present invention, in the lapping material in which the inorganic long fibers are impregnated with the thermosetting resin to form a flat plate-shaped molded body, the inorganic long fibers are used as the flat surfaces of the flat plate-shaped molded body. Since the fibers are oriented at an angle so that the fiber end surface appears on the tip surface, it is possible to obtain a lapping material that can be abraded even on a portion other than the tip surface. In particular, the inorganic long fibers impregnated with the thermosetting resin are wound around the outer periphery of the rotor along the rotation direction of the rotor while being wound, and the molding material wound on this rotor is cut in the axial direction of the rotor. And cut it open, spread it into a sheet, stack multiple sheets if necessary,
A wrapping material block is created by hardening by heating and pressing, and if the thick side of this block is cut into a flat plate shape so that the flat side is the flat side, the above-mentioned inorganic lengths will be formed on the front and back flat surfaces and the tip surface. It is possible to easily manufacture a wrapping material in which the end faces of the fibers are exposed, and the fibers aligned in each direction are partially woven by twilling so that delamination is unlikely to occur and strength is also improved. It will be excellent.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a wrapping material of the present invention.

FIG. 2 is a perspective view of another embodiment of the wrapping material of the present invention.

FIG. 3 is a perspective view showing a manufacturing process of the wrapping material of the present invention.

FIG. 4 is a perspective view showing a manufacturing process of the wrapping material of the present invention.

FIG. 5 is a perspective view showing a manufacturing process of the wrapping material of the present invention.

FIG. 6 is a perspective view of a conventional wrapping material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inorganic long fiber 1a Fiber end surface 2 Molded body 2a Flat surface 2b Flat surface 2c Tip surface 3 Molding material 10 Rotating body 11 Lapping material block

Claims (7)

[Claims] 1. A lapping material which is made into a flat plate-shaped molded product by impregnating inorganic long fibers with a thermosetting resin, and the fiber end faces appear on the front and back flat surfaces and the front end face of the flat plate-shaped molded product. A wrapping material characterized by being oriented at an angle as described above. 2. The wrapping material according to claim 1, wherein the inorganic long fibers are oriented at angles in a plurality of directions. 3. The wrapping material according to claim 1, wherein the inorganic long fibers are crossed and oriented at symmetrical angles in two directions. 4. The inorganic long fibers are attached to the flat surface 7
The lapping material according to any one of claims 1 to 3, wherein the lapping material is oriented at an angle of -20 degrees. 5. The inorganic long fiber is an inorganic long fiber selected from the group consisting of glass fiber, alumina fiber, boron fiber and silicon carbide fiber, according to any one of claims 1 to 4. Wrapping material. 6. The lapping material according to claim 1, wherein the inorganic long fibers are 30 to 75% by volume. 7. An inorganic long fiber impregnated with a thermosetting resin is wound around the outer periphery of the rotating body while traversing the outer periphery thereof, and the molding material wound on the rotating body is lined with the axis of the rotating body. Cut and cut open in the direction, open it into sheets, stack multiple sheets if necessary, and heat and press to harden them to create a wrapping material block. The thick side of this block is the flat surface side. A method for producing a wrapping material, which comprises slice-cutting into a flat plate shape.