JP2023057537A - Cutting grindstone and manufacturing method for the same - Google Patents

Abstract

To more reasonably provide a cutting grindstone which can maintain an excellent cutting ability to thereby enable a workpiece to be efficiently cut and has a long service life, and a manufacturing method for the cutting grindstone.SOLUTION: The cutting grindstone is provided in which abrasive grains are bonded each other with a binding agent and which is molded into a discoid shape and cuts a workpiece. At least a part of the abrasive grains is abrasive grain 11 in a long column shape in which a ratio of a length to a thickness of the long column shape is one to three more, consequently an aspect ratio is set to be three or more. At least a part of the abrasive grains 11 in the long column shape are lined up radially or parallel.SELECTED DRAWING: Figure 4

Description

TECHNICAL FIELD The present invention relates to a cutting whetstone having abrasive grains bonded with a binder and formed into a disk shape so as to cut a workpiece, and a method for manufacturing the same.

In a cutting wheel in which the abrasive grains are bonded by a binder, the abrasive grains corresponding to the cutting edge that grinds and cuts the workpiece, the binder that holds the abrasive grains, and the shavings (chips) are removed. It has an element called a pore, which is a gap necessary for According to this cutting wheel, when the workpiece is cut by the grinding action, the abrasive grains themselves are chipped and broken, so that fresh cutting edges appear one after another to maintain sharpness, and the abrasive grains are worn out. When the binding agent cannot hold the abrasive grains, the abrasive grains fall off and the next abrasive grains come out (autogenous action) repeatedly. Such a cutting wheel is desired to be sharp and capable of cutting workpieces efficiently, and to have a long service life.

A conventional cutting wheel includes a circular metal core portion having a mounting hole and an outer diameter smaller than the service limit of the grinding wheel portion, abrasive grains, and a resin binder for binding the abrasive grains. A cutting wheel is formed with an annular resinoid grinding wheel having the same thickness as the metal core and fixed to the outer periphery of the metal core with an adhesive or the like, and when the grinding wheel is worn out, it is removed. Therefore, a metal core portion has been proposed (Patent Document 1).

Also, in conventional cutting wheels, an abrasive article comprising a binder and abrasive grit, at least 10% by weight of the abrasive grit being abrasive particles, each of the abrasive particles having a front surface and a back surface; a front surface having substantially the same geometry as the back surface, the surfaces being separated by the thickness of the grain, and the shortest surface dimension:thickness ratio of the grain being at least 1:1, 2:1 or 5:1, and wherein the geometry of the abrasive particles is triangular, square, or circular.

Japanese Patent Application Laid-Open No. 2003-071724 (page 1) Japanese translation of PCT National Publication No. 7-509508 (claims 18 to 23)

Problems to be solved regarding the cutting wheel and its manufacturing method are to improve the overall shape of the cutting wheel and to improve the shape of the abrasive grains that are the constituent elements of the cutting wheel in order to improve its sharpness and service life. However, there is no proposal that can maintain a good sharpness and extend the service life by rationally improving the shape of the abrasive grains and the arrangement of the abrasive grains. be.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to more rationally provide a cutting wheel capable of maintaining a sharp state, efficiently cutting a workpiece, and having a long service life, and a method of manufacturing the same.

The present invention has the following configurations in order to achieve the above object.
According to one embodiment of the cutting wheel according to the present invention, the abrasive grains are bonded with a binder by press molding and thermosetting to form a disk shape, which is provided so as to cut the workpiece. In the cutting whetstone, at least part of the abrasive grains are elongated columnar abrasive grains having an aspect ratio of 3 or more due to a ratio of length to thickness of 1:3 or more. , at least part of the long columnar abrasive grains are aligned radially or in parallel.

According to one embodiment of the cutting wheel according to the present invention, the long columnar abrasive grains are arranged radially or in parallel on at least a part of the outer peripheral edge of the disk-shaped cutting wheel. can be done.
According to one embodiment of the cutting wheel of the present invention, the long columnar abrasive grains are aligned radially or in parallel in at least a part of one layer in the thickness direction of the disk-shaped cutting wheel. can be

According to one embodiment of the cutting wheel according to the present invention, at least part of the long columnar abrasive grains is formed into a long columnar ceramic body by firing an aggregate of fine alumina particles containing aluminum oxide as a main component. It can be characterized by long columnar ceramic abrasive grains.
According to one embodiment of the cutting wheel according to the present invention, the range of aspect ratios may be characterized in that the central aspect ratio is in the range of 4 to 25.

According to one embodiment of the cutting wheel of the present invention, the thickness range of the long columnar abrasive grains can be characterized in that the central thickness is in the range of 50 μm to 1500 μm.
According to one embodiment of the cutting wheel according to the present invention, the abrasive grains are a mixture of the long columnar ceramic abrasive grains and fused pulverized abrasive grains provided by pulverizing fused alumina. can be

According to one aspect of the method for manufacturing a cutting wheel according to the present invention, the alignment of the long columnar abrasive grains is performed by placing a material containing long columnar abrasive grains in a disk-shaped alignment mold provided with parallel or radial unevenness. It can be characterized by being performed by throwing in and giving vibration.
According to one embodiment of the method for manufacturing a cutting wheel according to the present invention, a plurality of sheet-shaped intermediate materials for the cutting wheel molded by the above-described method for manufacturing a cutting wheel are integrated by stacking and pressing, and then heated. By curing, it is possible to manufacture a cutting wheel with a required thickness.
According to one embodiment of the method for manufacturing a cutting wheel according to the present invention, at least two of the plurality of sheet-shaped intermediate materials for a grinding wheel are stacked with mutually shifted angles.

According to the cutting wheel of the present invention and the method of manufacturing the same, it is possible to maintain a sharp state, efficiently cut the workpiece, and have a particularly advantageous effect that the service life can be extended.

It is a top view which shows the example of a form of the cutting wheel which concerns on this invention. 2 is a cross-sectional view of the embodiment of FIG. 1; FIG. FIG. 2 is an enlarged cross-sectional view of the circumferential edge portion of the embodiment of FIG. 1; It is a top view which shows the example of a form of the cutting wheel which concerns on this invention. It is a top view which shows the example of a form of the cutting wheel which concerns on this invention. It is a top view which shows the example of a form of the cutting wheel which concerns on this invention. It is a top view which shows the example of a form of the cutting wheel which concerns on this invention. It is a top view which shows the example of a form of the cutting wheel which concerns on this invention. It is a top view which shows the example of a form of the cutting wheel which concerns on this invention. It is a sectional view showing an example of a form of a cutting whetstone concerning the present invention. It is a sectional view showing an example of a form of a cutting whetstone concerning the present invention. It is a sectional view showing an example of a form of a cutting whetstone concerning the present invention. It is a sectional view showing an example of a form of a manufacturing method of a cutting whetstone concerning the present invention.

Embodiments of a cutting wheel and a method for manufacturing the same according to the present invention will be described in detail below with reference to the drawings (FIGS. 1 to 12). This cutting whetstone is formed into a disk shape by pressing and thermosetting abrasive grains including long columnar abrasive grains 11 with a bonding agent 12, and is provided so as to cut the workpiece. It is. In addition, this cutting wheel is used by being fixed to the rotary drive tool by fitting the mounting hole 40 .

In the cutting wheel according to the present invention, at least a part of the abrasive grains are provided in a long columnar shape, and the ratio of length to thickness is 1:3 or more, so that the aspect ratio is 3 or more. At least a portion of the long columnar abrasive grains 11 are provided so as to be aligned radially or in parallel. The shape of the long-columnar abrasive grains 11 according to the present invention is, for example, a cylindrical shape, a prismatic shape, a polygonal columnar shape, or the like. For example, it has a rectangular shape, and is manufactured by firing after being molded by extrusion molding.

According to the cutting wheel according to the present invention, the long columnar abrasive grains 11, due to their long columnar shape, are appropriately chipped and broken one after another when cutting the workpiece by the grinding action, so that the edge of the cutting edge is fresh one after another. can be made to appear, a sharp state can be maintained, the workpiece can be efficiently cut, and the service life can be extended. In general fused pulverized abrasive grains provided by pulverizing conventional fused alumina, most of the aspect ratio is usually in the range of 1 to 2, and there is no clear directionality between long and short. Therefore, the effects of the present invention could not be obtained.

That is, the cutting wheel according to the present invention contacts the workpiece with its outer peripheral edge 20 by rotating, and cuts the workpiece by grinding. Since this cutting whetstone cuts a workpiece, it is provided with a doughnut-shaped disk-shaped whetstone portion 10 formed in a thin disk-like shape, and the long-columnar abrasive grains 11 are In the disk grindstone portion 10, the pillars are arranged in a state of falling down and bonded with a binder.

That is, the long columnar abrasive grains 11 are arranged in a direction substantially parallel to the flat surface 30 of the disk-shaped grindstone portion 10 rather than in an upright direction. Since the long columnar abrasive grains 11 are arranged along the plane of the disc grindstone portion 10 in this manner, the edge portion 11a, which is the edge in the longitudinal direction of the long columnar abrasive grains 11, is aligned with the cutting grindstone (circular It is easily exposed at the outer peripheral edge 20 of the grindstone portion 10), and has a shape that is appropriately easy to chip when cut by grinding.

According to this, the edge portions 11a of the long columnar abrasive grains 11 are sequentially chipped and broken, so that the blade edge can be renewed one after another, and the long columnar abrasive grains 11 are sequentially chipped in the longitudinal direction. Therefore, the cutting edge can be renewed over a long period of time without falling off from the bonding by the bonding agent 12 . As a result, it is possible to maintain a sharp state, efficiently cut the workpiece, and extend the service life.

In the cutting wheel according to the present invention, as shown in FIGS. 4 to 12, at least part of the long columnar abrasive grains 11 are aligned radially or in parallel. In the cutting wheel according to this embodiment, the long columnar abrasive grains 11 are arranged radially (see FIGS. 4 to 6) or parallel (see FIGS. 7 to 9) at least part of the outer peripheral edge of the disc-shaped cutting wheel. ) are aligned. Further, in the cutting wheel according to this embodiment, the long columnar abrasive grains 11 are aligned radially or in parallel in at least a part of one layer in the thickness direction of the disk-shaped cutting wheel (FIGS. 10 to 12 reference).

According to this, the orientation of the long columnar abrasive grains 11 is generated, and the long columnar abrasive grains 11 contact the workpiece at right angles as much as possible, and the workpiece is cut. . That is, the orientation of the long columnar abrasive grains 11 causes the axial line (line segment in the longitudinal direction) of the long columnar abrasive grains 11 to contact the workpiece at a right angle or as much as possible. becomes close to For this reason, the edge portions 11a of the long columnar abrasive grains 11 are easily chipped and damaged in succession, so that the cutting edges are renewed one after another, and the aforementioned effects are more likely to occur. In other words, by aligning the long columnar abrasive grains 11 as described above as in the present invention, a sharp state can be maintained more appropriately, cutting of the workpiece can be performed more efficiently, and the service life can be extended. The effect of being able to lengthen can be acquired. This effect is maximized when the long columnar abrasive grains 11 are aligned over the entire surface of the cutting grindstone (disc grindstone portion 10), but the effect is of course also produced when they are partially aligned. .

Specific examples of the arrangement of long columnar abrasive grains 11 will be described below with reference to FIGS.
In the embodiment shown in FIG. 4, the long columnar abrasive grains 11 are arranged radially as much as possible on almost the entire surface of the cutting wheel (disc grindstone portion 10) with the center of the disc grindstone portion 10 as the base point. , which is the most effective form.

In the embodiment shown in FIG. 5, the long columnar abrasive grains 11 are aligned radially as much as possible around the entire circumference of the outer peripheral edge of the cutting wheel (disc grindstone portion 10) with the center of the disc grindstone portion 10 as the base point. It is what was done. According to this, there is an advantage that the long columnar abrasive grains 11 can be effectively arranged in the portion of the cutting grindstone where the peripheral speed is high and the cutting operation can be performed most efficiently.

In the embodiment shown in FIG. 6, the long columnar abrasive grains 11 are placed on the inner peripheral side of the cutting wheel (disc grindstone portion 10) excluding the entire circumference of the outer peripheral edge, and the center of the disc grindstone portion 10 is the base point. are aligned radially as much as possible. According to this, the long columnar abrasive grains 11 are radially formed on the inner peripheral side portion of the disc grindstone portion 10 (the portion having a shape disadvantage) where it becomes gradually impossible to work efficiently as a cutting grindstone. There is an advantage that the performance can be maintained by compensating for the disadvantage of the shape.

In the embodiment shown in FIG. 7, the long columnar abrasive grains 11 are arranged in parallel as much as possible over almost the entire surface of the cutting grindstone (disc grindstone portion 10). In the embodiment shown in FIG. 7, in the upper and lower portions of the disk grindstone portion 10, the axis lines of the long columnar abrasive grains 11 are arranged in parallel so as to extend in the vertical direction. In the left and right portions of , the long columnar abrasive grains 11 are arranged parallel to each other so that their axes extend in the left-right direction, and are aligned in two directions. According to this, it is possible to obtain an effect equivalent to the case where the long columnar abrasive grains 11 are arranged radially.

In the embodiment shown in FIG. 8, long columnar abrasive grains 11 are arranged in parallel and in one direction as much as possible over almost the entire surface of the cutting grindstone (disc grindstone portion 10). According to this embodiment, the above-described cutting effect is slightly inferior to that of the embodiment shown in FIG. 7, but there is an advantage in that it is easy to manufacture. 9 shows a state in which long columnar abrasive grains 11 are arranged as shown in FIG. 8, and conventional abrasive grains with a small aspect ratio (for example, fused and pulverized abrasive grains 13) are mixed. showing.

Also, FIGS. 10 to 12 show examples in which the long columnar abrasive grains 11 are arranged in multiple layers (three layers in this example) in the thickness direction of the cutting wheel (disc grindstone portion 10). and can be aligned with more layers to improve the aforementioned cutting effect.
In the embodiment shown in FIG. 10, long columnar abrasive grains 11 are arranged in three layers in the thickness direction of the cutting grindstone (disc grindstone portion 10).
In the embodiment shown in FIG. 11, the long columnar abrasive grains 11 are two layers (in this embodiment, the middle layer in the thickness direction) out of the three layers in the thickness direction of the cutting wheel (disc grindstone portion 10). are aligned in two layers).
In the embodiment shown in FIG. 12, the long columnar abrasive grains 11 are aligned in the middle layer in the thickness direction among the three layers in the thickness direction of the cutting grindstone (disc grindstone portion 10).

Further, in the embodiment according to the present invention, at least a part of the long columnar abrasive grains 11 is formed into a long columnar ceramic body by firing an aggregate of fine alumina particles containing aluminum oxide as a main component. It is provided to be a ceramic abrasive grain. This long-columnar ceramic abrasive grain has a shape that can be produced at a lower cost than abrasive grains formed by firing that are polygonal and thin in the axial direction. As for the alumina fine particles as a raw material for forming the long columnar abrasive grains 11, those having a central particle size in the range of 50 nm to 100 nm can be used.

According to this, long-columnar ceramic abrasive grains, which are a type of long-columnar abrasive grains 11 and are more effective, can be appropriately provided. According to this long columnar ceramic abrasive grain, when cutting by grinding is performed as described above, it can be chipped and broken sequentially more appropriately, and the cutting wheel can maintain a good state of sharpness, so that the workpiece can be cut more efficiently. It can be used effectively and the service life can be extended. It should be noted that even with conventional fused and pulverized abrasive grains provided by pulverizing fused alumina, if the aspect ratio is in the range of 3 or more and there is a clear directionality of merits and demerits, such as in the present invention, Of course, the effect can be obtained.

Also, the higher the mixing ratio of the long columnar abrasive grains 11 to the total weight of the abrasive grains, the higher the effect described above. produces Since the long columnar abrasive grains 11 are costly, the best effect can be achieved when the mixing ratio is in the range of about 40 to 60%, for example, in terms of cost effectiveness.

Furthermore, in the embodiment according to the present invention, regarding the range of the aspect ratio, which is the ratio of the length to the thickness of the columnar shape of the long columnar abrasive grains 11, the central aspect ratio is in the range of 4 to 25. can improve performance.

That is, the larger the aspect ratio, which is the ratio of the length to the thickness of the columnar abrasive grains 11, the more the long columnar abrasive grains 11 are gradually chipped in the longitudinal direction, so that they do not come off. Since the cutting edge can be renewed over a long period of time, there is an advantage that the service life can be extended. However, when the aspect ratio of the long columnar abrasive grains 11 becomes extremely large, the long columnar abrasive grains 11 tend to break in the longitudinal direction due to the pressure applied during the manufacturing process of molding into a disc shape, and also tend to get entangled, making it difficult to disperse them uniformly. Since it becomes difficult, it is preferable that the aspect ratio is in an appropriate range.

Further, in the embodiment according to the present invention, regarding the range of thickness of the long columnar abrasive grains 11, the central thickness is in the range of 50 μm to 1500 μm, so that the performance can be further improved.

That is, since the cutting wheel according to the present invention rotates to cut the workpiece, the thickness of the disk grindstone portion 10 is set thin, for example, about 1 mm to 5 mm (1000 μm to 5000 μm), The long pillar-shaped abrasive grains 11 are arranged in the disc-shaped grindstone portion 10 in such a manner that the pillars are laid down, and are bound by a binder. Therefore, since the thickness of the long columnar abrasive grains 11 is in the range of 50 μm to 1500 μm, the long columnar abrasive grains 11 can be rationally arranged in a plurality of layers in the thickness direction, and the cutting performance by grinding can be improved. can increase

Further, in the embodiment according to the present invention, as shown in FIG. 9, the abrasive grains are long columnar ceramic abrasive grains, which are long columnar abrasive grains 11, and fused pulverized abrasive grains provided by pulverizing fused alumina. By being mixed, it is possible to configure a cutting wheel that has high cutting performance by grinding and is excellent in cost effectiveness.

That is, the long columnar ceramic abrasive grains can be effectively dispersed by interposing the fused and pulverized abrasive grains, and the fused and pulverized abrasive grains can suitably fill the gaps between the long columnar ceramic abrasive grains. , It is possible to improve the cutting performance by grinding, and to configure a cutting wheel excellent in cost-effectiveness.

Next, a basic method for manufacturing a cutting wheel applied to the present invention will be described. The method for manufacturing this cutting wheel is substantially the same as the conventional method.
First, the surface of abrasive grains containing at least a required amount of long-columnar abrasive grains 11 is coated with raw materials of powdery or liquid binding agent 12 made of thermosetting resin (for example, phenolic resin, epoxy resin) or thermoplastic resin. to coat. According to this, the abrasive grains are coated with the raw material of the powdery binding agent, and the pores are appropriately formed when the thermosetting resin is thermally cured.

Next, the abrasive grains coated on the surface with the thermosetting resin are placed in a molding die and press-fitted to form a disk shape by applying a required pressure.
Then, by heating and firing at a required temperature (for example, 180° C.), the thermosetting resin hardens to become the binding agent 12 that fixes the abrasive grains, and in a state in which pores are appropriately provided, A cutting wheel is completed.

Next, a method for manufacturing a cutting wheel for aligning long columnar abrasive grains 11 radially or in parallel according to the present invention will be described.
Alignment of the long columnar abrasive grains 11 as described above can be performed using vibration, and can also be performed using a mold provided with unevenness. Also, the long columnar abrasive grains 11 can be aligned by simultaneously using vibration and the mold.

That is, according to one example of the method for manufacturing a cutting wheel according to the present invention, the alignment of the long columnar abrasive grains 11 is performed by, for example, a disc-shaped alignment mold (mold) provided with parallel or radial unevenness and a long columnar shape. A material containing abrasive grains is put in and vibration is applied. According to this, since the long columnar abrasive grains 11 are stabilized by entering the recesses of the unevenness in at least one layer in contact with the uneven surface of the disk-shaped mold, the long columnar abrasive grains 11 can be reliably parallel or aligned. They can be arranged radially.

According to an example of the method for manufacturing a cutting wheel according to the present invention, a plurality of sheet-like intermediate materials 15 for a cutting wheel press-molded by the method for manufacturing a cutting wheel are stacked and further pressed. A cutting wheel having a required thickness can be manufactured by pressing, integrating, and then thermally curing. That is, for example, a sheet having a thickness corresponding to the diameter of the long columnar abrasive grains 11 whose surface is coated with a thermosetting resin and which is press-molded in contact with the uneven surface of the mold. A cutting wheel having a desired thickness can be manufactured by stacking a plurality of sheets of the intermediate grindstone material 15 in the shape of a sheet and laminating them together. According to this, it is possible to form a cutting whetstone in which the long columnar abrasive grains 11 of each layer are appropriately arranged, and it is possible to improve the cutting performance of the cutting whetstone.

Further, according to an example of the method for manufacturing a cutting wheel according to the present invention, when laminating a plurality of sheet-like intermediate materials 15 for a grinding wheel, at least two of the sheets are laminated with the angles shifted from each other. can be done. That is, as shown in FIG. 13 , when stacking a plurality of sheet-like intermediate materials 15 in the form of sheets from the lower layer to the upper layer so as to adhere to each other, at least 2 adjacent and overlapping with the center of the rotation axis of the cutting wheel as a reference. By laminating the sheet-shaped intermediate materials 15 of the grinding wheel while shifting the angle of the rotation direction between them, a cutting wheel having a desired thickness and having the long columnar abrasive grains 11 rationally arranged is formed. be able to.

More specifically, when the long-columnar abrasive grains 11 are arranged radially, half of one pitch between the radially arranged long-columnar abrasive grains 11 is occupied between the sheets of the intermediate material 15 for grinding stones. By shifting by , in plan view, the long columnar abrasive grains 11 of the next layer can be arranged in a state where the long columnar abrasive grains 11 of the next layer are placed between the long columnar abrasive grains 11 and the long columnar abrasive grains 11 of the first layer. can be improved. Further, when the long columnar abrasive grains 11 are aligned in parallel as shown in FIG. 13, each layer may be shifted in an angle range of, for example, 1° to 90° when laminating the sheet-like grinding stone intermediate material 15, and the cutting can be performed. can improve performance.

Next, Examples (1 to 4) are shown below as specific examples of the form of the cutting wheel.
[Example 1]
Long-columnar ceramic abrasive grains (grain size F60) containing 80% or more of aspect ratio 1:5 were used, liquid phenolic resin and powdered phenolic resin were used as the binder, and cleolite was used as the inorganic filler. The coated abrasive grains were placed in a disk-shaped mold having radially uneven surfaces to obtain a cutting wheel having an outer diameter of 105 mm and a thickness of 1.0 mm, in which the abrasive grains were arranged radially.

[Example 2]
Long columnar ceramic abrasive grains (particle size F60) containing 80% or more aspect ratio 1:5 are used at a ratio of 50% and alumina abrasive grains (particle size F60) are used at a ratio of 50%. Phenolic resin was used, and cleolite was used as an inorganic filler. These coated abrasive grains were put into a disk-shaped mold having radially uneven surfaces to obtain a cutting wheel with an outer diameter of 105 mm and a thickness of 1.0 mm, in which the abrasive grains were arranged radially.

[Example 3]
Long-columnar ceramic abrasive grains (particle size F60) containing 80% or more of aspect ratio 1:5 were used, liquid phenolic resin and powdered phenolic resin were used as the binder, and cleolite was used as the inorganic filler. The coated abrasive grains were put into a disk-shaped mold with radially uneven surfaces to obtain a sheet 15 having an outer diameter of 105 mm and a thickness of 0.4 mm, in which the abrasive grains were arranged parallel to the plane of the grindstone. . This sheet 15 was shifted so that the abrasive grains of the next sheet were placed between the abrasive grains of the sheet laid under it, and four sheets were stacked and pressed to obtain a cutting wheel with a thickness of 1.5 mm. .

[Example 4]
Long-columnar ceramic abrasive grains (particle size F60) containing 80% or more of aspect ratio 1:5 were used, liquid phenolic resin and powdered phenolic resin were used as the binder, and cleolite was used as the inorganic filler. The coated abrasive grains were put into a disk-shaped mold provided with parallel unevenness to obtain a sheet 15 having an outer diameter of 105 mm and a thickness of 0.4 mm, in which the abrasive grains were arranged parallel to the plane of the grindstone. . For example, as shown in FIG. 4, four sheets of this sheet 15 were stacked with the adjacent layers shifted by 45° and pressed to obtain a cutting wheel with a thickness of 1.5 mm.
Any of the above examples can improve the cutting performance.

Although the present invention has been described in various ways with preferred embodiments, the present invention is not limited to these embodiments, and many modifications can be made without departing from the spirit of the invention. It's about.

REFERENCE SIGNS LIST 10 disk grindstone part 11 long columnar abrasive grains 11a edge portion 12 binder 13 fused and pulverized abrasive grains 15 sheet (sheet-like intermediate material for grindstone)
20 Outer edge 30 Plane 40 Mounting hole

Claims (10)

In a cutting wheel provided to cut a workpiece by press molding and heat curing, abrasive grains are bonded with a binder and formed into a disc shape,
At least part of the abrasive grains are elongated columnar abrasive grains having an aspect ratio of 3 or more due to a ratio of length to thickness of 1:3 or more,
A cutting whetstone characterized in that at least part of the long columnar abrasive grains are aligned radially or in parallel. 2. The cutting wheel according to claim 1, wherein the long columnar abrasive grains are arranged radially or in parallel on at least a part of the outer peripheral edge of the disk-shaped cutting wheel. 2. The cutting wheel according to claim 1, wherein the long columnar abrasive grains are arranged radially or in parallel in at least a portion of one layer in the thickness direction of the disk-shaped cutting wheel. At least part of the long columnar abrasive grains are long columnar ceramic abrasive grains formed into a long columnar ceramic body by sintering aggregates of fine alumina particles containing aluminum oxide as a main component. The cutting wheel according to claim 1. 5. The cutting wheel according to claim 4, wherein the central aspect ratio is in the range of 4 to 25 for the range of aspect ratios. 6. The cutting wheel according to claim 5, wherein the thickness of the long columnar abrasive grains is in the range of 50 μm to 1500 μm at the center. 7. The cutting wheel according to claim 6, wherein said abrasive grains are a mixture of said long columnar ceramic abrasive grains and fused and pulverized abrasive grains provided by pulverizing fused alumina. A cutting wheel manufacturing method for manufacturing the cutting wheel according to any one of claims 1 to 7, wherein the long columnar abrasive grains are aligned in a disk-shaped alignment mold provided with parallel or radial unevenness. A method for manufacturing a cutting wheel, characterized in that a material containing long columnar abrasive grains is charged and vibration is applied. A plurality of sheet-shaped intermediate materials for a grinding wheel molded by the method for manufacturing a cutting wheel according to claim 8 are laminated and pressed to integrate them, and then thermally cured to obtain a cutting wheel having a required thickness. A method for manufacturing a cutting wheel, characterized by manufacturing. 10. The method of manufacturing a cutting wheel according to claim 9, wherein at least two of the plurality of sheet-shaped intermediate materials for a grinding wheel are laminated with mutually shifting angles.

Images