JP5111929B2 - Plate grinding wheel, mold machining method, and workpiece machining method - Google Patents

Description

  The present invention relates to a plate-like grindstone using an inorganic long fiber reinforced resin body and a method for processing a workpiece such as a mold using the plate-like grindstone.

Conventionally, among grindstones used for grinding, polishing, etc., those using inorganic long fiber reinforced resin bodies include inorganic long fiber reinforced resin bodies in which a plurality of fiber bundles of inorganic long fibers are laminated in the thickness direction. A rotating tool is proposed (see, for example, Patent Document 1).
JP 2003-285272 A

  Here, as shown in FIGS. 8 (a) and 8 (b), the inventor of the present application forms a plate-like grindstone using the inorganic long fiber reinforced resin body disclosed in Patent Document 1, and the like even in a narrow gap. It is proposed that polishing can be performed easily. However, as shown in FIG. 8 (b), the recess 110 of the plastic molding die formed by electric discharge machining has a narrow gap dimension as it goes deeper and the innermost gap dimension is about 0.5 mm. Therefore, when processing the inner surface 111 of the recess 110 with the plate-like grindstone 1 having an equal thickness of 1 mm, the plate-like grindstone 1 does not reach the back of the recess 110. However, as shown in FIG. 8 (c), the plate-shaped grindstone 1 having a thickness as thin as 0.5 mm is weak in the entire length of the plate-shaped grindstone 1, and polishing is efficient. There is a problem that cannot be done well. Further, since the plate-like grindstone 1 shown in FIG. 8 (c) is weak, if a force is applied during polishing, the plate-like grindstone 1 is greatly bent over the entire length direction. As a result of coming into contact with the opening edge 112 of the recess 110, there is a problem that the opening edge 112 is polished and the shape is distorted. Further, the plate-like grindstone 1 shown in FIGS. 8A, 8B, and 8C has a structure in which a plurality of fiber bundles of inorganic long fibers are laminated in the thickness direction. And in the lower surface 1f, the front-end | tip part of an inorganic long fiber is not exposed. For this reason, the plate-like grindstone 1 shown in FIGS. 8A and 8B has a problem that the upper surface 1e and the lower surface 1f have almost no polishing ability and can be polished only by the tip portion 1a.

  In view of the above problems, the problem of the present invention is that a plate-like grindstone that can be polished even in a narrow gap, is firm, and can be polished on the upper surface or the lower surface in addition to the end portion. Another object of the present invention is to provide a die machining method and a workpiece machining method using the plate-like grindstone.

In order to solve the above problems, the present invention comprises a plate-like inorganic long fiber reinforced resin body in which fiber bundles of inorganic long fibers are laminated in the thickness direction, and the length direction of the inorganic long fiber reinforced resin body and From the middle position in the length direction of the width direction to the tip portion, there is a taper surface that exposes the end portion of the inorganic long fiber while reducing the thickness of the inorganic long fiber reinforced resin body toward the tip side. The inorganic long fiber reinforced resin body is formed only on one surface of the upper surface and the lower surface, and a portion other than the tapered surface in the inorganic long fiber reinforced resin body has an equal thickness .

In the plate-like grindstone according to the present invention, the taper surface for reducing the thickness on the tip side is formed on the upper surface or the lower surface, so that the end of the plate-like grindstone can be inserted even in a narrow gap. Moreover, although the edge part of a plate-shaped grindstone is thin so that it can insert in a narrow clearance gap, the part with thick plate | board thickness is strong. For this reason, according to the plate-shaped grindstone of this invention, grinding | polishing can be performed efficiently. Further, since the plate-like grindstone of the present invention is strong, even if a force is applied during polishing, the plate-like grindstone only bends moderately, and does not come into contact with an extra place such as an opening edge of a gap. The situation of polishing the place does not occur. Further, in the plate-like grindstone, since a plurality of fiber bundles of inorganic long fibers are laminated in the thickness direction, the tip of the inorganic long fibers is not exposed on the upper surface and the lower surface as it is, Although there is no polishing ability, in the plate-like grindstone of the present invention, the tip of the inorganic long fiber is exposed on the tapered surface. Therefore, according to the present invention, it is possible to provide a plate-like grindstone having a polishing ability not only on the end face but also on the upper surface or the lower surface.

Further, the taper surface is formed from a midway position in the length direction of the inorganic long fiber reinforced resin body to the tip of the inorganic long fiber reinforced resin body, and the portion other than the taper surface in the inorganic long fiber reinforced resin body is It is the same thickness . For this reason, the portion other than the tapered surface in the plate-like grinding stone and the portion close to the equal thickness portion on the tapered surface have a strong waist, so the tip side can be pressed against the workpiece with a strong force, and polishing is efficiently performed It can be carried out. Further, it becomes easy to chuck the equal thickness portion with an ultrasonic tool, an air tool, an electric tool, etc., and the polishing efficiency can be improved. Furthermore, since the plate-like grindstone of the present invention is strong, even if a force is applied during polishing, it only bends moderately, and it will be polished in contact with extra places such as the opening edge of the gap. Things don't happen.

  In the present invention, the inorganic long fibers are inorganic long fibers selected from the group consisting of alumina fibers, silicon carbide fibers, boron fibers, and glass fibers.

  In the present invention, the inorganic long fiber reinforced resin body preferably has a thickness of 3 mm or less. If comprised in this way, since an inorganic long fiber reinforced resin body will be equipped with the flexibility to an out-of-plane direction, a plate-shaped grindstone is made into a workpiece | work using the repulsive force at the time of bending a plate-shaped grindstone. Can be reliably brought into contact with each other.

  In this invention, it is preferable that the said inorganic continuous fiber reinforced resin body is equipped with the flexibility to an out-of-plane direction. If comprised in this way, a plate-shaped grindstone can be reliably contact | abutted to a workpiece | work using the repulsive force at the time of bending a plate-shaped grindstone.

  In the present invention, the inorganic long fiber reinforced resin body includes a plurality of first fiber bundles oriented in a first direction with a predetermined interval as the fiber bundle, and the first bundle with a predetermined interval. A plurality of second fiber bundles arranged in a second direction intersecting with one fiber bundle, and the first fiber bundle and the second fiber bundle are interposed between one fiber bundle and the other. It is preferable that the fiber bundle is partially in the state. If comprised in this way, since the 1st fiber bundle and the 2nd fiber bundle do not comprise the clear layer structure, the function like a wedge is exhibited and the adhesion between layers is strong. Therefore, the failure of the upper-layer side fiber bundles from the lower-layer side fiber bundles (delamination) is unlikely to occur during polishing, so the life of the plate-like grindstone is long.

  In the workpiece processing method using the plate-like grindstone to which the present invention is applied, the plate-like grindstone and the workpiece in a state where the surface side on which the tapered surface is formed is pressed against the work surface of the workpiece. Are moved relative to each other. For example, in a die processing method using a plate-like grindstone to which the present invention is applied, the taper surface is formed in the plate-like grindstone with respect to the inner surface of a molding recess formed in a groove shape in the die. The plate-like grindstone and the mold are relatively moved in a state where the surface side is pressed.

In the present invention, since the tapered surface is formed on the upper surface or the lower surface of the plate-shaped grindstone so that the thickness decreases toward the end portion , the end portion of the plate-shaped grindstone can be inserted even in a narrow gap. Moreover, although the edge part of a plate-shaped grindstone is thin so that it can insert in a narrow clearance gap, the part with thick plate | board thickness is strong. For this reason, according to the plate-shaped grindstone of this invention, grinding | polishing can be performed efficiently. Further, since the plate-like grindstone of the present invention is strong, even if a force is applied during polishing, the plate-like grindstone only bends moderately, and does not come into contact with an extra place such as an opening edge of a gap. The situation of polishing the place does not occur. Further, in the plate-like grindstone, since a plurality of fiber bundles of inorganic long fibers are laminated in the thickness direction, the tip of the inorganic long fibers is not exposed on the upper surface and the lower surface as it is, Although there is almost no polishing ability, in the plate-like grindstone of the present invention, the tip of the inorganic long fiber is exposed on the tapered surface. Therefore, according to the present invention, it is possible to provide a plate-like grindstone having a polishing ability not only on the end face but also on the upper surface or the lower surface.

  Embodiments of the present invention will be described with reference to the drawings. In the following description, corresponding parts are denoted by the same reference numerals so that the correspondence with the structure described with reference to FIGS. 8A, 8B, and 8C can be easily understood. To do. In the drawings referred to in the following description, the scales of the respective layers and members are made different from each other in order to make each layer and each member recognizable on the drawing. In the drawings referred to below, a small dot is attached to a region where the tip of the inorganic long fiber has reached.

[Embodiment 1]
(overall structure)
FIGS. 1A, 1B, and 1C are a perspective view, a plan view, and a side view, respectively, of a plate-like grindstone according to Embodiment 1 of the present invention.

  The plate-like grindstone 1 shown in FIGS. 1 (a), 1 (b) and 1 (c) has a thickness direction (direction indicated by an arrow t) as described later with reference to FIGS. 2, 3 and 4. It consists of an inorganic long fiber reinforced resin body 10 in which fiber bundles of inorganic long fibers such as alumina fibers, silicon carbide fibers, boron fibers, and glass fibers are laminated.

  Further, in this embodiment, the upper surface 1 e of the plate-like grindstone 1 is formed with a tapered surface 1 t that reduces the thickness of the tip side of the end portion. The taper surface 1 t is the length of the plate-like grindstone 1. It is formed in a part of the vertical direction. That is, in the plate-like grindstone 1, the taper surface 1t is formed from a midway position in the length direction to the distal end portion 1a, and the base end portion 1b other than the taper surface 1t has an equal thickness. For example, in the plate-like grindstone 1, the base end portion 1b has an equal thickness of 1 mm, while the upper surface 1e has a tapered surface 1t having an inclination angle of about 2 ° from the middle portion to the tip side. The thickness of the tip 1a is 0.3 mm. In addition, the plate-like grindstone 1 may be configured such that the thickness of the base end portion 1b is 0.5 mm, 0.8 mm, 1.5 mm, 2.0 mm, and 3.0 mm. It has moderate flexibility in the out-of-plane direction. The plate-like grindstone 1 is formed with a width dimension of 4 to 10 mm and a length dimension of 100 to 150 mm, for example.

(Structure of inorganic long fiber reinforced resin body and production method thereof)
2 (a) and 2 (b) are explanatory views of the inorganic long fiber reinforced resin body constituting the plate-like grindstone to which the present invention is applied, respectively, and the positional relationship of the fiber bundles in the inorganic long fiber reinforced resin body is enlarged. It is explanatory drawing shown. 3 (a), 3 (b) and 3 (c) are explanatory views showing the first winding process of the fiber bundle and the second winding process in the manufacturing process of the plate-like grindstone according to the present invention. It is explanatory drawing shown and explanatory drawing which shows a mode that the molding material obtained by the winding-up process is cut in the axial direction of a rotary body. 4 (a), 4 (b), 4 (c), 4 (d), and 4 (e) are respectively reinforced with inorganic long fibers obtained by cutting the molding material shown in FIG. An explanatory view of a resin body, an explanatory view showing an enlarged surface thereof, an explanatory view of a small piece cut from an inorganic long fiber reinforced resin body, an explanatory view of a thin plate obtained by slicing this small piece, and a plate having a tapered surface formed on the thin plate It is explanatory drawing of a shape grindstone.

  1 (a), (b), and (c) includes an inorganic long fiber reinforced resin body 10 in which a fiber bundle of inorganic long fibers is impregnated with a thermosetting resin. As shown in FIGS. 2 (a) and 2 (b), the fiber reinforced resin body 10 has a plurality of first fiber bundles 6a oriented in a first direction with a predetermined interval, and a predetermined interval. A plurality of second fiber bundles 6b arranged in a second direction that are open and intersect with the first fiber bundle 6a, and the first fiber bundle 6a and the second fiber bundle 6b. Is in a state where the other fiber bundle partially enters between one fiber bundle. FIG. 2 (b) schematically shows a state in which the second fiber bundle 6b partially enters between the adjacent first fiber bundles 6a.

  The inorganic long fiber is not particularly limited as long as it is a material that is relatively abrasive to the material to be polished, that is, a material that is harder and more brittle than the material to be polished. Silicon fibers, boron fibers, or glass fibers are used, and among them, alumina fibers and silicon carbide fibers have very good polishing properties for ferrous and non-ferrous metals. Depending on the material to be polished, these may be mixed.

  As the inorganic long fiber, those having an average fiber diameter of about 10 to 50 μm are used, and the fiber bundle weight is, for example, about 250 to 3000 Tex. From the viewpoint of the resin impregnation property, it is ideal to impregnate a large number of thin fiber bundles of about 500 Tex and impregnate the resin into a fiber bundle, but if the fiber impregnation property is good, the fiber bundle of 1500 Tex It is also possible to impregnate the resin with a 3000 Tex fiber bundle as it is. The thermosetting resin is a binder for solidifying the inorganic long fiber, and epoxy resin, unsaturated polyester resin, vinyl ester resin, bismaleimide resin, phenol resin, or the like is used.

  In producing such an inorganic long fiber reinforced resin body 10 and the plate-like grindstone 1, first, as shown in FIG. 3A, a first fiber bundle of inorganic long fibers impregnated with a thermosetting resin is used. FIG. 3B shows a first winding process in which 6a is wound in a state inclined with respect to the outer peripheral surface 21 in the first direction along the rotational direction of the rotating body 20 with a predetermined interval. Thus, the fiber bundle 6b of the inorganic long fiber impregnated with the thermosetting resin with respect to the outer peripheral surface 21 along the rotation direction of the rotating body 20 with respect to the first direction of the first winding step At least one second winding step is performed for each winding step with a predetermined interval in a state inclined in the second direction on the opposite side.

  At that time, a resin composition was prepared by blending 100 parts of an epoxy resin (DER383J Dow Chemical), 80 parts of tetrahydromethylphthalic anhydride (HN2200 Hitachi Chemical) and 1 part of imidazole (2E4MZ-CN Shikoku Chemicals). The resin tank containing the resin composition is impregnated with resin through 40 μm-diameter fiber bundles 6 a and 6 b of alumina fibers made of 500 filaments. On the other hand, the wire is wound with an interval of several mm while being inclined by 10 ° to 20 ° in the circumferential direction. At that time, after winding in one direction (first winding step), when turning and winding in the other direction (second winding step), tilt 10 ° to 20 ° to the opposite side of the first winding step Wrap it with a few mm gap. Then, although the entire surface is covered by several round trips, the first winding step and the second winding step are repeated several times, or 10 times or more, as necessary. Here, if the inclination angle of the inorganic long fibers is symmetric between the first fiber bundle 6a and the second fiber bundle 6b, a stable polishing ability can be exhibited.

Next, as shown in FIG. 3 (c), the molding material 11 wound on the rotating body 20 is cut in the axial direction 210 of the rotating body 20 and cut into a sheet shape, and this sheet is formed into a single layer or a plurality of layers. For example, it is cured by heating and pressing at a pressure of 100 kg / cm ² to obtain an inorganic long fiber reinforced resin body 10 as shown in FIG.

  In the inorganic long fiber reinforced resin body 10 obtained in this way, as shown in an enlarged view in FIG. 4B, the first fiber bundle 6a and the second fiber bundle 6b both have a predetermined interval. Since they are arranged open, when heated and pressed, the second fiber bundle 6b partially enters the first fiber bundle 6a, and the first fiber bundle is interposed between the second fiber bundles 6b. 6a partially enters. For this reason, the first fiber bundle 6a and the second fiber bundle 6b do not constitute a clear layer structure.

  Next, as shown in FIG. 4C, the inorganic long fiber reinforced resin body 10 is cut into small pieces of the inorganic long fiber reinforced resin body 1y, and then the small pieces of the inorganic long fiber reinforced resin body 1y. As shown in FIG. 4D, a thin plate-like inorganic long fiber reinforced resin body 1z is obtained. After that, as shown in FIG. 4 (e), the upper surface of the thin plate-like inorganic long fiber reinforced resin body 1z is polished with a diamond grindstone, and FIGS. 1 (a), (b) and (c) are referred to. As described above, the plate-like grindstone 1 having the tapered surface 1t is obtained.

(Processing method for workpiece)
In the plate-like grindstone 1 of the present embodiment, the first fiber bundle 6a and the second fiber bundle 6b are arranged in a direction crossing each other, and thus are shown in FIGS. 1 (a), (b), and (c). The tip of the inorganic long fiber is in a state of reaching the tip 1a and the side end face 1c of the plate-like grindstone 1, and the tip of the inorganic long fiber can be used as a cutting edge to polish the workpiece surface. Moreover, in the plate-shaped grindstone 1 of this embodiment, since the tip of the inorganic long fiber is exposed even on the tapered surface 1t, the tip of the inorganic long fiber can be used as a cutting edge to polish the workpiece.

  A processing method for flattening the inner surface of the gap formed by electric discharge machining on a resin molding die (work) using the plate-like grindstone 1 of this embodiment will be described with reference to FIG.

  FIGS. 5 (a), (b), and (c) are explanatory views of a mold (work) for resin molding, and explanatory views showing a state in which the tip side of the plate-like grindstone 1 is inserted into a gap between the molds, It is explanatory drawing which shows a mode that the plate-shaped grindstone 1 is moved.

  In the mold 100 shown in FIG. 5A, a groove-like recess 110 for forming a rib or the like is formed by electric discharge machining. The concave portion 110 has a gap size that becomes narrower as it goes deeper, and the innermost portion has a gap size of 0.5 mm. In polishing the upper surface of the inner surface 111 of the concave portion 110, for example, in this embodiment, the plate-like grindstone 1 shown in FIGS. 1 (a), (b), and (c) is used. Here, the plate-like grindstone 1 has a base end portion 1b having an equal thickness of 1 mm, whereas a top surface 1e is formed with a tapered surface 1t having an inclination angle of about 2 °, and the tip portion 1a has a thickness. Is 0.3mm. For this reason, as shown in FIG. 5B, the tip side of the plate-like grindstone 1 can be inserted to the back of the concave portion 110 of the mold 100. At this time, the plate-like grindstone 1 is inserted so as to face the tapered surface 1t side with respect to the inner surface 111 (upper surface) to be polished in the concave portion 110 of the mold 100.

  Then, while applying a force so that the plate-like grindstone 1 abuts against the inner surface 111 of the concave portion 110 of the mold 100, the plate-like grindstone 1 is moved to the die as shown in FIGS. By reciprocating with respect to 100, the inner surface 111 of the concave portion 110 of the mold 100 is polished so that the plate-like grindstone 1 is scraped by the tip portion 1a. Further, the plate-like grindstone 1 is tilted so that the tapered surface 1t is brought into contact with the inner surface 111 of the concave portion 110 of the mold 100, and in this state, as shown in FIGS. Is reciprocated with respect to the mold 100, and the inner surface 111 of the recess 110 of the mold 100 is polished so as to be scraped by the tip 1a and the tapered surface 1t of the plate-like grindstone 1. In any of these forms, the plate-like grindstone 1 bends moderately, so that the plate-like grindstone 1 can be elastically pressed against the inner surface 111 of the recess 110 of the mold 100 by its repulsive force. Therefore, the inner surface 111 of the recess 110 of the mold 100 can be polished efficiently.

  In this process, the plate-like grindstone 1 may be moved manually, but the base end portion 1b of the plate-like grindstone 1 is chucked with an ultrasonic tool, air tool, electric tool, etc., and a combination of reciprocation and vibration is combined. May be processed.

(Main effects of this form)
As described above, the upper surface 1e of the plate-like grindstone 1 of the present embodiment is formed with the tapered surface 1t that reduces the thickness on the front end side. The tip side of the plate-like grindstone 1 can be inserted even in the gap. Moreover, although the front end side is thin so that it can insert in a narrow clearance gap among the plate-shaped grindstones 1, since the thickness is thick on the base end side, it is firm. For this reason, according to the plate-shaped grindstone 1 of this form, grinding | polishing can be performed efficiently.

  Further, since the plate-like grindstone 1 of this embodiment is strong, even if a force is applied during polishing, it only bends moderately, without touching an extra place such as the opening edge of the recess 110, The situation that the extra place is ground does not occur.

  Moreover, since the plate-like grindstone 1 has a structure in which a plurality of fiber bundles of inorganic long fibers are laminated in the thickness direction, the tip of the inorganic long fibers is not exposed on the upper surface 1e as it is, Although there is no polishing capability, in the plate-like grindstone 1 of this embodiment, the tip of the inorganic long fiber is exposed at the tapered surface 1t. Therefore, according to the plate-like grindstone 1 of the present embodiment, not only the front end portion 1a and the side end surface 1c but also the upper surface 1e has a polishing ability.

  Furthermore, in this embodiment, as described with reference to FIGS. 2A and 2B, the first fiber bundle 6a and the second fiber bundle 6b are all arranged at a predetermined interval. Therefore, the second fiber bundle 6b partially enters between the first fiber bundles 6a, and the first fiber bundle 6a partially enters between the second fiber bundles 6b. For this reason, since the first fiber bundle 6a and the second fiber bundle 6b do not constitute a clear layer structure, the fiber bundle on the upper layer side is the fiber on the lower layer side during grinding or polishing. The problem of peeling from the bundle (delamination) is unlikely to occur.

[Embodiment 2]
FIGS. 6A, 6B, and 6C are a perspective view, a plan view, and a side view, respectively, of a plate-like grindstone according to Embodiment 2 of the present invention. In the first embodiment, the planar shape of the plate-like grindstone 1 is a rectangle, and the front end portion 1a is perpendicular to the side end face 1c, but these are shown in FIGS. 6 (a), 6 (b), and 6 (c). In the plate-like grindstone 1A, the tip end portion 1a is inclined with respect to the side end face 1c. If comprised in this way, when performing the process demonstrated with reference to FIG.5 (b), since the front-end | tip part 1a contacts diagonally with respect to convex parts, such as a burr | flash, a convex part can be removed efficiently. The plate-like grindstone 1A is also composed of a plate-like inorganic long fiber reinforced resin body 10 in which fiber bundles of inorganic long fibers are laminated in the thickness direction as in the first embodiment. Therefore, the same reference numerals are assigned to the common parts, and the description thereof is omitted.

(Other forms)
In the plate-like grindstone 1 of the above embodiment, although a configuration in which a tapered surface 1t from the middle position in the length direction of the plate-like grindstone 1 to the tip portion 1a is formed, FIG. 7 (a), (b) , ( As in the plate-like grindstone 1B shown in c), a tapered surface 1t is formed from one halfway position in the width direction toward one side end face 1c, and the other portion 1h in the width direction is an equal thickness portion 1h. May be adopted. As in the first embodiment, the plate-like grindstone 1B is composed of a plate-like inorganic long fiber reinforced resin body 10 in which fiber bundles of inorganic long fibers are laminated in the thickness direction. Therefore, the same reference numerals are assigned to the common parts, and the description thereof is omitted.

In the above embodiment, since the first fiber bundle 6a and the second fiber bundle 6b are both arranged at a predetermined interval, the second fiber bundle 6b is a part between the first fiber bundle 6a. However, as a result of arranging the first fiber bundle 6a and the second fiber bundle 6b without gaps, an inorganic long fiber reinforced resin body in which the fiber bundles are laminated with a layer structure is used. The present invention may be applied to a plate-like grindstone.

(a), (b), (c) is a perspective view, a plan view, and a side view, respectively, of the plate-like grindstone according to Embodiment 1 of the present invention. (a), (b), respectively, is an explanatory view of an inorganic long fiber reinforced resin body constituting a plate-like grindstone to which the present invention is applied, and an enlarged positional relationship of fiber bundles in the inorganic long fiber reinforced resin body. It is explanatory drawing shown. (a), (b), (c) is an explanatory view showing a first winding process of a fiber bundle, and an explanation showing a second winding process in the manufacturing process of a plate-like grindstone according to the present invention. It is explanatory drawing which shows a mode that the molding material obtained by the figure and the winding process is cut in the axial direction of a rotary body. (a), (b), (c), (d), (e) are inorganic long fiber reinforced resin bodies obtained by cutting the molding material shown in FIG. , Explanatory view showing the surface thereof in an enlarged manner, an explanatory view of a small piece cut from the inorganic long fiber reinforced resin body, an explanatory view of a thin plate obtained by slicing the small piece, and a plate-like grindstone in which a tapered surface is formed on the thin plate It is explanatory drawing of. (a), (b), (c) is an explanatory view of a mold (work) for resin molding, an explanatory view showing a state in which the tip side of a plate-like grindstone is inserted into the gap of the die, and a plate-like shape It is explanatory drawing which shows a mode that the grindstone is moved. (a), (b), (c) is a perspective view, a plan view, and a side view, respectively, of a plate-like grindstone according to Embodiment 2 of the present invention. (a), (b), (c) is a perspective view, a plan view, and a side view, respectively, of a plate-like grindstone according to a reference example of the present invention. It is explanatory drawing of the plate-shaped grindstone which concerns on the reference example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A, 1B Plate-shaped grindstone 1a Plate-shaped grindstone tip 1b Plate-shaped grindstone base end 1c Plate-shaped grindstone side end surface 1e Plate-shaped grindstone upper surface 1t Plate-shaped grindstone taper surface 6a, 6b Inorganic long fiber Fiber bundle 10 Inorganic long fiber reinforced resin body

Claims (7)

A plate-like inorganic long fiber reinforced resin body in which fiber bundles of inorganic long fibers are laminated in the thickness direction,
From the middle position in the length direction of the length direction and the width direction of the inorganic long fiber reinforced resin body to the tip portion, the thickness of the inorganic long fiber reinforced resin body is reduced toward the tip side and the above A tapered surface exposing the end of the inorganic long fiber is formed only on one of the upper surface and the lower surface of the inorganic long fiber reinforced resin body,
In the inorganic long fiber reinforced resin body, a portion other than the tapered surface has an equal thickness . The plate-like grindstone according to claim 1, wherein the inorganic long fibers are inorganic long fibers selected from the group consisting of alumina fibers, silicon carbide fibers, boron fibers, and glass fibers . The plate-like grindstone according to claim 1 or 2, wherein the inorganic long fiber reinforced resin body has a thickness of 3 mm or less . The plate-like grindstone according to any one of claims 1 to 3, wherein the inorganic long fiber reinforced resin body has flexibility in an out-of-plane direction . The inorganic long fiber reinforced resin body includes, as the fiber bundle, a plurality of first fiber bundles oriented in a first direction at a predetermined interval, and the first fiber bundle at a predetermined interval. A plurality of second fiber bundles arranged in a second direction intersecting with
5. The first fiber bundle and the second fiber bundle are in a state in which the other fiber bundle partially enters between one fiber bundle. 6. Plate-shaped grinding wheel. A die processing method using the plate-like grindstone according to any one of claims 1 to 5,
The plate-shaped grindstone and the mold are relatively moved in a state where the surface side of the plate-shaped grindstone on which the tapered surface is formed is pressed against the inner surface of the molding recess formed in a groove shape in the mold. A mold processing method characterized by the above. A workpiece processing method using the plate-like grindstone according to any one of claims 1 to 5 ,
A workpiece machining method, wherein the plate-like grindstone and the workpiece are moved relative to each other in a state in which the surface side on which the tapered surface is formed is pressed against the workpiece surface .

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