JP4398521B2 - Wrapping material and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lapping material for polishing suitable for deburring and polishing. More specifically, for deburring and polishing of iron or iron alloy, aluminum or aluminum alloy, copper or copper alloy, magnesium alloy, nickel or nickel alloy, and further polishing these molds. The present invention relates to a suitable lapping material for polishing.
[0002]
[Prior art]
For example, as disclosed in Japanese Utility Model Publication No. 51-12796, Japanese Patent Application Laid-Open No. 1-222865, etc., a molded body in which inorganic long fibers are hardened with a thermosetting resin is extremely useful as a wrapping material. It is a well-known fact that since the fiber diameters are uniform, linear scratches do not occur on the polished surface of the mold or the like, and the finishing of the mold or the like is possible even for an amateur.
[0003]
[Problems to be solved by the invention]
According to the prior art, the finishing efficiency (processing efficiency) of the finished surface has to depend on the fiber diameter. First, rough polishing is performed with a lapping material made of fibers having a large fiber diameter, such as 40 μm, and then the fiber diameter. Polishing was performed with a wrapping material made of fibers of about 15 μm, and finally polishing was performed with a wrapping material made of fibers having a fiber diameter of about 10 μm, and finally buffing with polishing powder was performed.
However, the stick-shaped wrapping material cut out from the molded plate prepared by aligning the fibers in one direction as in the wrapping material disclosed in Japanese Patent Laid-Open No. 1-222865 shown above has a thread in the polishing direction. When the stick is made into a thin plate having a thickness of 0.5 to 1 mm, cracks are likely to occur along the direction of the yarn aligned in one direction when the stick is twisted. It had the disadvantage of causing vertical cracks. Also, when polishing with this stick, because the yarn is aligned in one direction, the polishing direction is not fixed, and the polishing direction is inevitably slightly shifted from side to side, causing so-called lateral sliding. The phenomenon was seen.
In addition, since grinding and polishing are performed on the fiber end face aligned in one direction, the fiber diameter must be increased in order to increase the efficiency in the rough polishing region where the fiber diameter is 40 μm or more. It has been necessary to study the production of yarns that are difficult to manufacture when the fiber diameter is large.
Therefore, the present invention is less likely to cause vertical cracking even in a stick shape having a thickness of 0.5 to 1 mm suitable for polishing a thin groove such as a rib of a mold. Therefore, the present invention intends to provide a lapping material that does not cause side slip, has good biting property on the ground surface, and has improved grinding and polishing efficiency. That is, the present invention provides means for increasing the efficiency of grinding and polishing in each of the above steps.
[0004]
[Means for Solving the Problems]
As a method of increasing the grinding and polishing efficiency using fibers with a constant fiber diameter, the present inventors have conducted intensive research, and as a result, established a certain angle between the direction of grinding and polishing and the direction of fiber alignment. In addition, a stick obtained by slicing the twill parallel to the swirled surface from a plate obtained by tapping the twill in both the left and right directions in the grinding and polishing directions, not in one direction By using as a wrapping material, the stick was not twisted in one direction during polishing, and the grinding and polishing efficiency was successfully increased.
That is, the wrapping material of the present invention according to claim 1 is a flat molded body in which inorganic long fibers are impregnated with a thermosetting resin and have flat surfaces on the front and back, and the inorganic long fibers are symmetrical with respect to the polishing direction. Wrapping material that is oriented in two directions and is ground and polished at the fiber end surface of each long fiber appearing on the front end surface in the longitudinal direction of the molded body, wherein each long fiber is in a direction perpendicular to the polishing direction. In addition, an elliptical fiber end surface having a major axis in a direction parallel to the flat surface of the molded body is provided.
The wrapping material according to claim 2 is characterized in that the inorganic long fibers are oriented in two symmetrical directions at an angle of 10 to 45 degrees with respect to the polishing direction.
The wrapping material according to claim 3 is characterized in that the inorganic long fibers are oriented in two symmetrical directions at an angle of 12.5 to 45 degrees with respect to the polishing direction.
The wrapping material according to claim 4 is characterized in that the inorganic long fibers are oriented in two directions symmetrical to the polishing direction by traversing.
The wrapping material according to claim 5, wherein the inorganic long fiber is an inorganic long fiber selected from the group consisting of glass fiber, alumina fiber, silicon carbide fiber, boron fiber and silicon nitride fiber. Features.
The wrapping material according to claim 6 is characterized in that the inorganic long fibers are 70 to 85% by weight.
According to a seventh aspect of the present invention, there is provided a method for producing a wrapping material according to the present invention, in which an inorganic long fiber impregnated with a thermosetting resin is wound while traversing the outer circumference along the rotating direction of the rotating body. Cut the molding material wound up in the axial direction of the rotating body, cut it open, spread it into a sheet, and if necessary, stack multiple sheets and cure by heating and pressing to create a wrapping material block The block is sliced into flat plates so that the traversed surface of the block is on the flat surface side during lapping.
Moreover, the manufacturing method of the wrapping material according to claim 8 is characterized in that the traverse is parallel winding.
The wrapping material manufacturing method according to claim 9 is characterized in that the traverse is helically wound.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
A stick-shaped lapping material produced by aligning fibers in two directions symmetrical to the grinding and polishing directions without aligning the fibers in one direction has the following characteristics.
First, since the fibers are oriented in two directions with respect to the grinding and polishing directions, the stick is not twisted in one direction during the grinding and polishing.
Also, compared to a stick in which fibers are oriented in only one direction, vertical cracks are less likely to occur when the stick is twisted. This is particularly noticeable in thin sticks having a thickness of 0.5 to 1 mm.
[0006]
Further, by grinding the fibers and orienting the fibers in two directions symmetrical to the polishing direction, each long fiber 1 has an elliptical shape having a long axis in a direction orthogonal to the polishing direction, as shown in FIG. Since the fiber end face is provided, the outer peripheral edge 1a on the front end side of the fiber end face acting on the material to be polished becomes longer, and the grinding and polishing efficiency increases. In this way, the fiber end surface acting on the material to be polished on the polishing surface, although the normal lapping fiber 1 having a circular fiber end and the lapping material for polishing and the fiber content shown in FIG. 3 are the same. As a result, the outer peripheral edge 1a on the front end side becomes longer and the grinding and polishing efficiency increases, and it is possible to increase the efficiency as if using thicker fibers.
[0007]
In addition, since the fibers are oriented in two directions that are bilaterally symmetrical with respect to the grinding and polishing directions, the fibers do not slip sideways during the grinding and polishing, and the efficiency in precision polishing increases. That is, by wobbling the fibers in this way in both the left and right directions, the biting of the workpiece during grinding and polishing is improved, and the grinding and polishing efficiency is improved.
[0008]
Examples of the inorganic fibers include glass fibers, alumina fibers, silicon carbide fibers, boron fibers, and silicon nitride fibers. According to experiments by the present inventors, alumina fibers or silicon carbide fibers. Are particularly suitable for polishing iron, nickel and their alloy materials, and glass fibers are particularly suitable for aluminum, copper and magnesium alloys.
[0009]
The UD prepreg in which the inorganic long fibers are aligned in one direction is laminated in several layers so as to have a constant angle in both the left and right directions, and press-molded so that the fibers are oriented at the same angle on the left and right with respect to the grinding and polishing directions. And the wrapping material as described above can be obtained.
Further, after the fiber bundle of the inorganic long fibers is impregnated with the resin through the resin and wound around the cylinder at an angle θ with respect to the circumferential direction by a method called so-called helical winding by the filament winding method, As shown in FIG. 1, a block material 20 in which the fiber bundles 11 of the inorganic long fibers 1 are oriented in two directions is obtained, which is parallel to the press surface. The lapping material can be obtained by cutting out the stick 21.
In addition, by winding the cylinder to the right so that the angle is 10 to 45 degrees with respect to the circumferential direction by so-called parallel winding, and repeating winding the next layer to the left, A block having an angle in the left direction may be formed and heated and pressed to form a block.
[0010]
The thermosetting resin impregnated with the inorganic long fibers is not particularly limited, but is preferably a thermosetting resin such as an epoxy resin or a phenol resin. Especially when heat resistance is required, polyimide, polyamide, polymaleimide resin and the like are also used.
The fiber content of the wrapping material is preferably in the range of 60 to 87% by weight. In addition, if it is less than 60% by weight, the abrasiveness is lowered, and if it exceeds 87% by weight, the adhesion of inorganic long fibers is deteriorated and the strength is reduced. Therefore, the range of 70 to 85% by weight is optimal.
[0011]
The orientation angle of the inorganic long fiber with respect to the shaving direction is less than 10 degrees with respect to the polishing direction, and the increase rate of the outer peripheral length on the front end side of the fiber end surface acting on the material to be polished is small. Is desirable. The range of 17.5 ° to 45 ° is optimal for maintaining the elastic modulus in the vertical direction and the resistance to bending and obtaining the biting effect on the polished surface. Note that at an angle exceeding 45 degrees, the strength and elastic modulus in the polishing direction are greatly reduced, which is not suitable for practical use.
[0012]
【Example】
Next, examples of the wrapping material of the present invention will be described.
Example 1
First, an epoxy resin (DER 383J Dow Chemical Japan) in which the following resin composition was prepared as a resin composition 100 parts tetrahydromethyl phthalic anhydride (HN2200 Hitachi Chemical) 80 parts imidazole (2E4MZ-CN Shikoku Chemicals) 2 parts The above resin composition 24 resin fibers are impregnated with 24 alumina fibers made of 2000 TEX, in which 500 alumina fibers having a fiber diameter of 40 μm are aligned, and are impregnated in a circumferential direction into a cylinder having a fiber diameter of 106 mm. The sheet was shifted by 70.5 mm with respect to one rotation and reciprocated 6 times in parallel winding (parallel winding) to a width of 282 mm, and then cut in the axial direction to create a sheet. This sheet formed a sheet in which alumina fiber layers inclined 12.5 degrees to the right with respect to the circumferential direction and alumina fiber layers inclined 12.5 degrees to the left alternately overlapped.
[0013]
Two sheets thus prepared were cut into a length of 320 mm in the circumferential direction, the two sheets were stacked in the same direction, and placed in a 330 mm × 300 mm positive mold heated at 120 ° C., and 100 kg / cm ² And a plate having a thickness of 10.1 mm was prepared.
A test piece was cut out from this plate and the content of the fiber was measured and found to be 82.5% by weight.
[0014]
Further, a square bar was cut out from the plate to a width of 10 mm in the circumferential direction, and this was tilted sideways and cut into a width of 1 mm to produce a stick having a width of 10 mm, a thickness of 1 mm, and a length of 100 mm.
This stick is parallel to a 10 mm wide surface with alternating layers of fibers aligned 12.5 degrees to the right and 12.5 degrees to the left. It forms a stick with fibers facing in two directions.
S45C steel mold using this stick and a stick (fiber content is 83% by weight) in which the fibers are aligned in one direction using fibers having the same fiber diameter of 40 μm as in the embodiment in the length direction. In this example, the stick with the twilling in two directions is much better in biting and sharpening on the surface to be polished than the fiber stick aligned in one direction. A good polished surface with no side slip and no linear flaws was obtained.
On the other hand, the stick in which the fibers were aligned in only one direction was weak to twist, and when it was twisted, a vertical crack was easily generated.
Also, using the stick of the above example and the stick (fiber content 84% by weight) in which the fiber is aligned in only one direction using the fiber of 50 μm instead of the fiber of 40 μm of the example, S45C As a result, the stick made by shaking the twill using the fiber having the fiber diameter of 40 μm in the example in the biting property to the polished surface was unidirectionally arranged with the fiber having the fiber diameter of 50 μm in one direction. It had almost the same bite to the mold as the sticks made by pulling them together. That is, by shaking the twill, fibers with a fiber diameter of 50 μm were drawn in only one direction, and the biting property equivalent to that of a stick could be obtained with a fiber with a fiber diameter of 40 μm.
[0015]
(Example 2)
The resin composition containing the same resin composition as in Example 1 was impregnated with a resin composition by passing one alumina fiber composed of 2000 TEX, in which 500 alumina fibers having a fiber diameter of 40 μm were aligned, and the fiber composition was impregnated with a fiber diameter of 106 mm. The resulting cylinder was wound by a filament winding machine with a helical winding at an angle of 21.6 degrees with respect to the circumferential direction. The design was such that the next fiber bundle was wound next to the fiber bundle wound earlier in one reciprocation so as to be displaced by 5.875 mm in one reciprocation. Thus, the molding material wound by reciprocating 392 to the width of 282 mm was cut open in the axial direction of the cylinder, and the sheet | seat was created.
[0016]
Two sheets thus prepared were cut into a length of 320 mm in the circumferential direction, and the two sheets were stacked in the same direction and placed in a 330 mm × 300 mm positive mold heated at 120 ° C., and 100 Kg / cm ² The plate was pressed with pressure and taken out after 1 hour to prepare a plate having a thickness of 6.5 mm.
A test piece was cut out from this plate and the fiber content was measured and found to be 82.0% by weight.
[0017]
Further, a square bar was cut out from the plate to a width of 10 mm in the circumferential direction, and this was tilted sideways and cut into a width of 1 mm to produce a stick having a width of 10 mm, a thickness of 1 mm, and a length of 100 mm.
This stick is parallel to a surface having a width of 10 mm with respect to the length direction, and a fiber bundle facing 21.6 degrees to the right and 21.6 degrees to the left with respect to the length direction. It was shaken and formed a stick with fibers facing in two directions.
Using this stick and a stick in which fibers are aligned in only one direction in the length direction, an S45C steel mold was polished. Compared with the stick of Example 1, the bite of the stick of Example 2 is much better than the stick of Example 1. It was excellent. This is thought to be due to the large traverse angle of Example 2. Further, a good polished surface free from vertical cracks when twisted and free from linear flaws was obtained.
On the other hand, the stick in which the fibers were aligned in only one direction was weak to twist, and when it was twisted, a vertical crack was easily generated.
[0018]
【The invention's effect】
According to the wrapping material of the present invention, since the fibers are oriented in two directions with respect to the grinding and polishing directions, the stick is not twisted in one direction during the grinding and polishing. Further, compared to a stick in which fibers are oriented in only one direction, vertical cracks are less likely to occur when the stick is twisted. Also, by grinding the fibers and orienting the fibers in two directions symmetrical to the polishing direction, each fiber has an elliptical fiber end surface having a major axis in a direction orthogonal to the polishing direction. The outer peripheral edge on the front end side of the fiber end surface acting on the abrasive becomes longer, and the grinding and polishing efficiency is improved. In addition, it does not slide sideways during grinding and polishing, so that the efficiency in precision polishing is improved, the biting of the workpiece during grinding and polishing is improved, and the grinding and polishing efficiency is improved.
Further, according to the method for producing a wrapping material of the present invention, a wrapping material having a desired elliptical fiber end can be obtained by simply winding an inorganic long fiber around a cylinder at an arbitrary angle and in an arbitrary winding manner. Easy to manufacture.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a manufacturing process of a wrapping material of the present invention. FIG. 2 is a schematic diagram of an end surface of the wrapping material of the present invention. FIG. 3 is a schematic diagram of an end surface of a conventional wrapping material.
1 Inorganic long fibers (single fibers)
1a Outer peripheral edge 11 Fiber bundle 20 Block material 21 Stick

Claims (9)

The inorganic long fiber is impregnated with a thermosetting resin to form a flat molded body having flat surfaces on the front and back, the inorganic long fiber is oriented in two directions symmetrical to the polishing direction, and the longitudinal front end of the molded body A wrapping material that is ground and polished at the fiber end surface of each long fiber that appears on the surface, wherein each long fiber is in a direction perpendicular to the polishing direction and parallel to the flat surface of the molded body. A wrapping material comprising an elliptical fiber end face having a long axis .   The wrapping material according to claim 1, wherein the inorganic long fibers are oriented in two symmetrical directions at an angle of 10 to 45 degrees with respect to the polishing direction.   The wrapping material according to claim 2, wherein the inorganic long fibers are oriented in two symmetrical directions at an angle of 12.5 to 45 degrees with respect to the polishing direction.   The wrapping material according to any one of claims 1 to 3, wherein the inorganic long fibers are oriented in two directions symmetrical to the polishing direction by traversing.   The inorganic long fiber is an inorganic long fiber selected from the group consisting of glass fiber, alumina fiber, silicon carbide fiber, boron fiber, and silicon nitride fiber. Wrapping material described in 1. The wrapping material according to any one of claims 1 to 5, wherein the inorganic long fiber is 70 to 85% by weight .   The inorganic long fiber impregnated with the thermosetting resin is wound while traversing the outer circumference along the rotation direction of the rotating body, and the molding material wound on the rotating body is cut in the axial direction of the rotating body. Cut and spread it into sheets, if necessary, stack multiple sheets and cure by heating and pressing to create a wrapping material block, and the traversed surface side of this block will be the flat surface side during wrapping A method for producing a wrapping material, characterized in that it is sliced into a flat plate shape.   8. The method for manufacturing a wrapping material according to claim 7, wherein the traversing is parallel winding.   The method for producing a wrapping material according to claim 7, wherein the traverse is helically wound.

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