JP5238488B2 - Brush-like grindstone - Google Patents

Description

  The present invention relates to a brush-like grindstone for deburring and grinding.

  Precision parts used for automobile parts, aircraft parts, etc. are mainly produced by automatic machines such as NC lathes, NC milling machines, machining centers, robots, and special machine tools using tools such as end mills, drills, dies, and taps. Manufactured with high precision. Electronic equipment frames and the like are manufactured by magnesium or aluminum die-cast products. For these workpieces, grinding is performed to remove processing marks, tool marks, burrs, and the like using a nylon brush with abrasive grains, a brass brush, a wire brush, or the like. However, nylon brushes with abrasive grains, brass brushes, and wire brushes have a problem that grinding power is weak and grinding cannot be performed efficiently due to low abrasive content, low hardness, and low waist. There is.

Therefore, the applicant of the present application uses a brush-like grindstone that holds a plurality of linear bodies impregnated and cured with a binder resin in an aggregate fiber of alumina fiber, silicon carbide fiber, carbon fiber, silicon nitride fiber, and glass fiber, and held in a holder. is suggesting. If it is a brush-like grindstone using such an inorganic long fiber, since it is high hardness and firmness, its grinding ability is high and its life is long (see, for example, Patent Document 1).
JP 2000-94344 A

  However, even with the brush-like grindstone disclosed in Patent Document 1, in the case of a workpiece having irregularities on the surface, the deburring and grinding are performed to every corner of the recess only by moving the brush-like grindstone along the surface of the workpiece. I can't do it. However, when the brush-like grindstone is moved in a state where the brush-like grindstone is strongly applied to the workpiece, the inorganic long fiber used for the brush-like grindstone has a problem that it is frequently broken due to its high hardness.

  In view of the above problems, the object of the present invention is to prevent the breakage of the linear abrasive material while maintaining the high hardness of the linear abrasive material obtained by impregnating and solidifying the aggregate yarn of inorganic long fibers. Is to provide a simple brush-like grindstone.

In order to solve the above-mentioned problem, in the present invention, a plurality of linear abrasives obtained by impregnating and solidifying an inorganic continuous fiber aggregate yarn are held by a holder whose outer peripheral side surface is a circumferential surface , Among the inorganic long fibers, in a rotary brush-like grindstone that grinds a workpiece with a portion exposed at the tip of the linear abrasive material , the inorganic long fibers include alumina fibers, silicon carbide fibers, carbon fibers, One of silicon nitride fibers and glass fibers, wherein each of the plurality of linear abrasives is curved in the same circumferential direction at at least one location from the proximal end side to the distal end side. And

  In the present invention, it is preferable that each of the plurality of linear abrasives is curved from the proximal end side to the entire distal end side.

  In the brush-like grindstone of the present invention, the workpiece is ground by moving it relative to the workpiece in a state where the tip of the linear abrasive is pressed against the workpiece. Here, since the linear abrasive is formed by impregnating and solidifying a resin to the aggregate yarn of inorganic long fibers, the density of the inorganic long fibers that substantially function as an abrasive is high, and the hardness is low. Is also strong. Therefore, the brush-like grindstone of the present invention has a high grinding ability. Further, in the present invention, the linear abrasive is in a curved state even when the brush-like grindstone is stopped, and easily deforms in the bending direction. Therefore, in the brush-like grindstone according to the present invention, compared to the brush-like grindstone in which the linear abrasive material extends linearly, the linear abrasive material has a softer contact with the workpiece at the tip and is excessive. Since it deforms and absorbs excessive force when force is applied, it does not break.

  In the present invention, it is possible to employ a configuration in which each of the plurality of linear abrasives extends radially from the outer peripheral side surface of the holder and is curved in the same circumferential direction.

  In the present invention, it is preferable that the plurality of linear abrasives are held in the holder in a plurality of bundles. With this configuration, there are advantages such as efficient removal of chips during grinding and a high heat dissipation effect. Moreover, since it has a structure in which a plurality of linear abrasives are divided and fixed to the holder, it is possible to prevent the linear abrasives from coming off. Therefore, the brush-like grindstone according to the present invention has an advantage of high safety.

  In this invention, you may employ | adopt the structure currently hold | maintained over the whole circumferential direction in the circumferential groove formed in the one side end surface or outer peripheral side surface of the said holder for the said plurality of linear abrasives.

  In the present invention, it is preferable that the plurality of linear abrasives have an elliptical cross section or an elliptical cross section with a minor axis in the bending direction. If comprised in this way, since it will deform | transform and absorb an excessive force when an excessive force is added to a linear abrasive, it will not break.

  In the present invention, it is preferable that a rotational drive shaft extends in an axial direction from the holder. If comprised in this way, a brush-shaped grindstone can be driven only by connecting a drive shaft to a drive device.

  In the present invention, alumina fibers, silicon carbide fibers, carbon fibers, silicon nitride fibers, glass fibers, and the like can be used as the inorganic long fibers.

(A), (B), (C) is a perspective view, a plan view of a brush-like grindstone according to Embodiment 1 of the present invention, and a cross section of a linear abrasive used for this brush-like grindstone. It is explanatory drawing shown. (A), (B) is the perspective view and side view of the brush-shaped grindstone which concerns on the reference example 1 of this invention. (A), (B) is a perspective view and a side view of a brush-like grindstone according to Reference Example 2 of the present invention. (A), (B) is the perspective view and top view of a brush-like grindstone concerning Embodiment 2 of the present invention. (A), (B) is a perspective view and a side view of a brush-like grindstone according to Reference Example 3 of the present invention. It is a side view of the brush-like grindstone concerning reference example 4 of the present invention. It is explanatory drawing which shows the usage example of the brush-shaped grindstone which concerns on the reference example 4 of this invention. It is explanatory drawing which shows the brush-shaped grindstone which concerns on the modification of the reference example 4 of this invention, and its usage example. (A), (B) is the top view and side view of the brush-shaped grindstone which concerns on the reference example 5 of this invention. It is explanatory drawing which shows the usage example of the brush-shaped grindstone which concerns on the reference example 5 of this invention. (A), (B) is the top view and side view of a brush-like grindstone concerning reference example 6 of the present invention. It is explanatory drawing which shows the usage example of the brush-shaped grindstone which concerns on the reference example 6 of this invention. In the brush-like grindstone to which the present invention is applied, it is an explanatory diagram in the case of using a linear abrasive that is curved at one location from the proximal end side to the distal end side. In the brush-shaped grindstone to which this invention is applied, it is explanatory drawing of another example using the linear abrasive which curves in one place from the base end side to the front end side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Brush-like grindstone 2 Linear abrasive 5 Holder 20 Abrasive material bundle 51 Shaft hole 53 Embedded hole 55 Rotary drive shaft 57 Outer peripheral side surface 59 One end face W of the workpiece Workpiece

  Embodiments of the present invention will be described with reference to the drawings. In the drawings referred to in the following description, the number of linear abrasives and abrasive bundles is reduced to facilitate the recognition of the configuration of each member.

[Embodiment 1]
1 (A), (B), and (C) schematically show a perspective view, a plan view, and a cross-section of a linear abrasive used for the brush-like grindstone according to Embodiment 1 of the present invention. FIG. A brush-like grindstone 1 shown in FIGS. 1 (A) and 1 (B) has a plurality of linear abrasives 2 formed by impregnating and solidifying an inorganic long fiber aggregate yarn, and held by a metal holder 5. It has a structure. The holder 5 has a cylindrical shape in which a shaft hole 51 penetrating in the axial direction is formed in the center, and a rotary drive shaft 55 inserted into the shaft hole 51 is attached to the holder by a screw (not shown) stopped from the side. 5 is connected.

  In this embodiment, the linear abrasive 2 is a thermoset of a silicone resin, a phenol resin, an epoxy resin, a polyimide resin, a polymaleimide resin, an unsaturated polyester resin, a urethane resin, etc., on an aggregate yarn of alumina long fibers as inorganic long fibers. Is obtained by impregnating and curing a functional binder resin. As the binder resin, a thermoplastic resin such as nylon may be used. As an aggregate yarn, for example, 250 to 3000 aggregates of alumina long fibers having a fiber diameter of 8 to 50 μm are used, and the aggregate yarn has a diameter of 0.1 mm to 2 mm. As the gathering yarn, a yarn to which no twist is added is used.

  In the brush-like grindstone 1 of this embodiment, a plurality of embedded holes 53 are formed at equal angular intervals on the outer peripheral side surface 57 of the holder 5. In each of the plurality of embedded holes 53, a plurality of linear abrasives 2 are bundled in a round shape as an abrasive bundle 20 (an aggregate of the linear abrasives 2), and the base end side is a silicone resin type or an epoxy resin type It is fixed with an adhesive. Therefore, the plurality of linear abrasives 2 extend radially from the outer peripheral side surface 57 of the holder 5 as the abrasive bundle 20. Even in the state where the abrasive bundle 20 is formed, the plurality of linear abrasives 2 are in an independent state.

  Here, all of the linear abrasive 2 is curved toward one side in the circumferential direction, for example, clockwise CW, from the proximal end side to the distal end side. Curved clockwise CW. Further, as shown in FIG. 1 (C), the linear abrasive 2 has an elliptical cross section or an elliptical cross section with the minor axis in the bending direction.

  When performing deburring or grinding for flattening the surface of the workpiece W using the brush-like grindstone 1 of the present embodiment, the drive shaft 55 is connected to the drive device of the grinder in FIG. As shown in (A) and (B), it was rotated around the axis L in the direction opposite to the bending direction of the linear abrasive material 2 (counterclockwise CCW) and arranged on the outer peripheral side of the brush-like grindstone 1. The tip side of the linear abrasive 2 is brought into contact with the surface of the workpiece W. As a result, the inorganic long fibers exposed at the tip of the linear abrasive 2 in the brush-like grindstone 1 cut and grind the burrs and irregularities of the workpiece W as a substantial abrasive. When performing the grinding operation, not only the rotational motion, but also a reciprocating motion, an oscillation motion, a swing motion, or a motion combining these motions may be performed along the surface of the workpiece W. Furthermore, the movement which moves the brush-shaped grindstone 1 in the direction which approaches the workpiece | work W, and the direction which leaves | separates may be combined.

  In producing such a brush-like grindstone 1, in order to form a curved linear abrasive 2, first, for example, 1000 monofilaments of alumina filaments having a diameter of 10 μm to 15 μm, in an untwisted state The bobbin of the collected yarn (strand) that is continuously wound and wound up flat is set on the creel. Next, the aggregate yarn is pulled out from the bobbin, dipped in a binder resin such as an epoxy resin, impregnated with the binder resin, and then the cylindrical or cylindrical winding is performed while removing excess binder resin with a squeeze roller. Take up so that it does not overlap the peripheral surface of the take-up roller. At that time, due to the tension applied to the aggregate yarn, the positions of the respective alumina long fibers constituting the aggregate yarn are shifted, and the aggregate yarn is deformed into an elliptical cross section or an elliptical cross section. Next, when the binder resin is solidified, it is possible to form a linear abrasive 2 that is curved along the peripheral surface of the take-up roller. In the linear abrasive 2, the cross-section thereof is the linear abrasive 2. It becomes a cross-sectional elliptical shape or a cross-sectionally long round shape in which the minor axis is directed in the bending direction. Next, the linear abrasive 2 wound around the outer peripheral surface of the take-up roller is cut in the axial direction of the take-up roller so that the linear abrasive 2 is peeled off from the take-up roller, and then linear The abrasive 2 is trimmed to a desired length. Next, after bundling a predetermined number of linear abrasives 2 with the curved direction being aligned, one end portion is inserted into the embedding hole 53 of the holder 5, and adhesion such as epoxy resin or silicone resin is performed. Fix to the holder 5 with an agent or the like.

  According to such a manufacturing method, the curved linear abrasive 2 can be efficiently formed, and the linear abrasive 2 curved with a desired curvature can be formed by changing the outer diameter of the winding roller. Further, if the outer shape of the winding roller is elliptical or oval, it is possible to form a linear abrasive 2 that has a curvature that changes depending on the position, or that is curved with a straight portion in part.

  As described above, in the brush-like grindstone 1 of the present embodiment, the workpiece W is ground by being moved relative to the workpiece W in a state where the tip of the linear abrasive material 2 is pressed against the workpiece W. Here, since the linear abrasive 2 is made by impregnating and solidifying a resin to the aggregate yarn of inorganic long fibers, the density of the inorganic long fibers substantially functioning as an abrasive is high, and the hardness is high. Strong waist. Therefore, the brush-like grindstone 1 of this embodiment has a high grinding ability.

  Further, in the brush-like grindstone 1 of this embodiment, all of the plurality of linear abrasives 2 are in a state of being curved from the proximal end side to the distal end side, and have a cross-sectional elliptical shape or a cross-sectional length with the minor axis in the bending direction It has a round shape. For this reason, the linear abrasive 2 has extremely high rigidity in a direction orthogonal to the bending direction, but easily deforms toward the bending direction. Therefore, in the brush-like grindstone 1 of the present embodiment, the linear abrasive 2 has a softer contact with the workpiece W at the tip than the brush-like grindstone 1 in which the linear abrasive 2 extends linearly, and When an excessive force is applied, it deforms and absorbs the excessive force, so it does not break.

  Further, since the linear abrasive 2 is fixed to the holder 5 in a state of being divided into a bundle of abrasives 20, chips during grinding are efficiently discharged, and the heat dissipation effect is high. For this reason, the brush-like grindstone 1 of this embodiment is excellent in grindability. Therefore, deburring and grinding of precision processed parts can be performed efficiently and with high accuracy. Moreover, since the high grinding performance is obtained with a small number of the linear abrasives 2, the cost of the brush-like grindstone 1 can be reduced. Further, since the linear abrasive 2 is divided into small portions and fixed to the holder 5, the linear abrasive 2 can be prevented from coming off. Therefore, the brush-like grindstone 1 of this embodiment has an advantage of high safety.

[Modification of Embodiment 1]
In the first embodiment, a configuration is adopted in which a plurality of linear abrasives 2 are held by the holder 5 as a plurality of abrasive bundles 20, but a circumferential groove is formed on the outer peripheral side surface 57 of the holder 5. A configuration in which a plurality of linear abrasives 2 are held over the entire circumferential direction of the circumferential groove may be employed.

[ Reference Example 1 ]
2A and 2B are a perspective view and a side view of a brush-like grindstone according to Reference Example 1 of the present invention. Since the basic configuration of the present embodiment and the reference example and embodiment described later are the same as those of the first embodiment, portions having common functions are denoted by the same reference numerals. As in the first embodiment, the brush-like grindstone 1 shown in FIGS. 2A and 2B also has a linear abrasive 2 made by impregnating and solidifying an aggregate yarn of alumina long fibers (inorganic long fibers). It has a structure that is held by a plurality of metal holders 5. The holder 5 has a cylindrical shape in which a shaft hole 51 penetrating in the direction of the axis L is formed in the center, and a rotary drive shaft 55 is connected to the holder 5.

  In the brush-like grindstone 1 of this embodiment, a plurality of embedded holes 53 are formed at equal angular intervals on the outer peripheral side surface 57 of the holder 5. In each of the plurality of embedded holes 53, a plurality of linear abrasives 2 are bundled in a round shape as an abrasive bundle 20 (an aggregate of the linear abrasives 2), and the base end side is a silicone resin type or an epoxy resin type It is fixed with an adhesive. Therefore, the plurality of linear abrasives 2 extend radially from the outer peripheral side surface 57 of the holder 5 as the abrasive bundle 20. In addition, in the state made into the abrasive bundle 20, each of the plurality of linear abrasives 2 is in an independent state.

  Here, all the linear abrasives 2 are curved to one side in the axis L direction from the base end side to the tip end side, and accordingly, the entire abrasive bundle 20 is also curved to one side in the axis L direction. Yes. Further, as described with reference to FIG. 1C, the linear abrasive 2 has a cross-sectional elliptical shape or a cross-sectional oval shape in which the minor axis is directed in the bending direction.

  When performing deburring or grinding on the surface of the workpiece W using the brush-like grindstone 1 of this embodiment, with the drive shaft 55 connected to the drive device of the grinding machine, FIG. As shown in B), for example, it is rotated counterclockwise CCW, and the tip side of the linear abrasive 2 is brought into contact with the surface of the workpiece W arranged on the outer peripheral side of the brush-like grindstone 1. As a result, the inorganic long fibers exposed at the tip of the linear abrasive 2 in the brush-like grindstone 1 cut and grind the burrs and irregularities of the workpiece W.

  Even in the brush-like grindstone 1 configured as described above, the linear abrasive 2 is impregnated and solidified with an inorganic long fiber aggregate yarn, as in the first embodiment, and thus has high hardness and high grinding ability. Have Further, each of the plurality of linear abrasives 2 is in a state of being curved from the proximal end side to the distal end side, and has a cross-sectional elliptical shape or a cross-sectionally long round shape with the minor axis in the bending direction. For this reason, the linear abrasive 2 is easily deformed in the bending direction. Therefore, the linear abrasive 2 is soft against the tip of the workpiece W, and even when an excessive force is applied to the unevenness of the surface of the workpiece W, the linear abrasive 2 is deformed and absorbs the excessive force, so that it does not break. Furthermore, since the linear abrasive 2 is fixed to the holder 5 in a state of being divided into the abrasive bundles 20, chips are efficiently discharged at the time of grinding and an effect such as a high heat dissipation effect is exhibited. .

[Modification of Reference Example 1 ]
In the reference example 1 described above, a configuration in which a plurality of linear abrasive materials 2 are formed into a plurality of abrasive material bundles 20 and held by the holder 5 is employed. However, a circumferential groove is formed on the outer peripheral side surface 57 of the holder 5, You may employ | adopt the structure by which the several linear abrasive 2 is hold | maintained over the whole circumferential direction of this circumferential groove.

[ Reference Example 2 ]
3A and 3B are a perspective view and a side view of a brush-like grindstone according to Reference Example 2 of the present invention. As in the first and second embodiments, the brush-like grindstone 1 shown in FIGS. 3A and 3B is also a linear abrasive obtained by impregnating and solidifying an aggregate of alumina long fibers (inorganic long fibers). 2 has a structure in which a plurality of 2 are held by a metal holder 5. The holder 5 has a cylindrical shape in which a shaft hole 51 penetrating in the direction of the axis L is formed in the center, and a rotation drive shaft 55 is coupled thereto.

  In the brush-like grindstone 1 of this embodiment, a plurality of embedded holes 53 are formed at equal angular intervals on the outer peripheral side surface 57 of the holder 5. In each of the plurality of embedded holes 53, a plurality of linear abrasives 2 are bundled in a round shape as an abrasive bundle 20 (an aggregate of the linear abrasives 2), and the base end side is a silicone resin type or an epoxy resin type It is fixed with an adhesive. Therefore, the plurality of linear abrasives 2 extend radially from the outer peripheral side surface 57 of the holder 5 as the abrasive bundle 20. In addition, in the state made into the abrasive bundle 20, each of the plurality of linear abrasives 2 is in an independent state.

  Here, all the linear abrasives 2 are curved to one side in the axis L direction from the base end side to the tip end side, and accordingly, the entire abrasive bundle 20 is also curved to one side in the axis L direction. Yes. Further, as described with reference to FIG. 1C, the linear abrasive 2 has a cross-sectional elliptical shape or a cross-sectional oval shape in which the minor axis is directed in the bending direction.

The brush-like grindstone 1 of this embodiment has a linear abrasive 2 longer than the brush-like grindstone 1 of Reference Example 1 , and the tip of the linear abrasive 2 extends substantially parallel to the axis L. Therefore, when deburring the workpiece W or grinding the surface using the brush-like grindstone 1 of the present embodiment, the drive shaft 55 is connected to the drive device of the grinding machine in FIG. , (B), the workpiece W is rotated around the axis L, for example, counterclockwise CCW, and the workpiece W having the surface (surface to be ground) directed in the direction of the axis L is ground on the tip side of the linear abrasive 2. To do.

  Even in the brush-like grindstone 1 configured as described above, the linear abrasive 2 is impregnated and solidified with an inorganic long fiber aggregate yarn, as in the first embodiment, and thus has high hardness and high grinding ability. Have Further, each of the plurality of linear abrasives 2 is in a state of being curved from the proximal end side to the distal end side, and has a cross-sectional elliptical shape or a cross-sectionally long round shape with the minor axis in the bending direction. For this reason, the linear abrasive 2 is easily deformed in the bending direction. Therefore, the linear abrasive 2 is soft against the tip of the workpiece W, and even when an excessive force is applied to the unevenness of the surface of the workpiece W, the linear abrasive 2 is deformed and absorbs the excessive force, so that it does not break. Furthermore, since the linear abrasive 2 is fixed to the holder 5 in a state of being divided into the abrasive bundles 20, chips are efficiently discharged at the time of grinding and an effect such as a high heat dissipation effect is exhibited. .

[Modification of Reference Example 2 ]
In the reference example 2 described above, a configuration in which a plurality of linear abrasive materials 2 are formed into a plurality of abrasive material bundles 20 and held by the holder 5 is employed. However, a circumferential groove is formed on the outer peripheral side surface 57 of the holder 5, You may employ | adopt the structure by which the several linear abrasive 2 is hold | maintained over the whole circumferential direction of this circumferential groove.

[ Embodiment 2 ]
4A and 4B are a perspective view and a plan view of a brush-like grindstone according to Embodiment 2 of the present invention. As with the first embodiment, the brush-like grindstone 1 shown in FIGS.
A plurality of linear abrasives 2 formed by impregnating and solidifying resin in an aggregate yarn of inorganic long fibers) are held by a metal holder 5. The holder 5 has a cylindrical shape in which a shaft hole 51 penetrating in the direction of the axis L is formed in the center, and a rotary drive shaft 55 inserted into the shaft hole 51 by a screw (not shown) stopped from the side. It is connected to the holder 5.

  A plurality of, for example, three holders 5 are arranged in the direction of the axis L. A plurality of embedded holes 53 are formed at equal angular intervals in each of the outer peripheral side surfaces 57 of the three holders 5. In each of the plurality of embedded holes 53, a plurality of linear abrasives 2 are bundled in a round shape as an abrasive bundle 20 (an aggregate of the linear abrasives 2), and the base end side is a silicone resin type or an epoxy resin type It is fixed with an adhesive. Therefore, the plurality of linear abrasives 2 extend radially from the outer peripheral side surface 57 of the holder 5 as the abrasive bundle 20. In this embodiment, among the three holders 5, the holding position of the linear abrasive 2 is shifted in the circumferential direction between the adjacent holders 5. In addition, in the state made into the abrasive bundle 20, each of the plurality of linear abrasives 2 is in an independent state.

  Here, in any of the three holders 5, the linear abrasive 2 is curved toward one side in the circumferential direction from the base end side to the tip end side, for example, clockwise CW, and accordingly, the abrasive material The entire bundle 20 is also curved clockwise CW. Further, as shown in FIG. 1 (C), the linear abrasive 2 has an elliptical cross section or an elliptical cross section with the minor axis in the bending direction.

  When performing deburring or grinding on the surface of the workpiece W using the brush-like grindstone 1 of the present embodiment, as in the first embodiment, the drive shaft 55 is connected to the drive device of the grinding machine, As shown in FIGS. 4 (A) and 4 (B), the brush-like grindstone 1 is rotated counterclockwise CCW, and the surface of the workpiece W arranged on the outer peripheral side of the brush-like grindstone 1 is moved to the tip of the linear abrasive 2. Grind on the side.

  In this embodiment, the three holders 5 are stacked in three stages. However, in the single holder 5, the positions of the rows of embedded holes 53 formed at equal angular intervals in the circumferential direction are shifted in the direction of the axis L. A plurality of them may be formed. The number of holders 5 may be two or four or more.

[Modification of Embodiment 2 ]
In the second embodiment , a configuration is adopted in which a plurality of linear abrasives 2 are formed as a plurality of abrasive bundles 20 and held by a plurality of holders 5. A configuration may be adopted in which a circumferential groove is formed in 57 and a plurality of linear abrasives 2 are held over the entire circumferential direction of the circumferential groove.

[ Reference Example 3 ]
5A and 5B are a perspective view and a side view of a brush-like grindstone according to Reference Example 3 of the present invention. Similarly to the first embodiment, the brush-like grindstone 1 shown in FIGS.
A plurality of linear abrasives 2 formed by impregnating and solidifying resin in an aggregate yarn of inorganic long fibers) are held by a metal holder 5. The holder 5 has a cylindrical shape in which a shaft hole 51 penetrating in the direction of the axis L is formed in the center, and a rotary drive shaft 55 inserted into the shaft hole 51 by a screw (not shown) stopped from the side. It is connected to the holder 5.

  Three holders 5 are arranged in the direction of the axis L. In each of the three holders 5, a plurality of embedded holes 53 are formed on the outer peripheral side surface 57 at equal angular intervals. In each of the plurality of embedded holes 53, a plurality of linear abrasives 2 are bundled in a round shape as an abrasive bundle 20 (an aggregate of the linear abrasives 2), and the base end side is a silicone resin type or an epoxy resin type It is fixed with an adhesive. Therefore, the plurality of linear abrasives 2 extend radially from the outer peripheral side surface 57 of the holder 5 as the abrasive bundle 20. In this embodiment, among the three holders 5, the holding position of the linear abrasive 2 is shifted in the circumferential direction between the adjacent holders 5. In addition, in the state made into the abrasive bundle 20, each of the plurality of linear abrasives 2 is in an independent state.

  Here, in any of the three holders 5, the linear abrasive 2 is curved to one side in the axis L direction from the base end side to the tip end side, and accordingly, the entire abrasive bundle 20 is also in the axis L direction. Is curved on one side. Further, as shown in FIG. 1 (C), the linear abrasive 2 has an elliptical cross section or an elliptical cross section with the minor axis in the bending direction.

When performing deburring grinding or surface grinding on the workpiece W using the brush-like grindstone 1 of the present embodiment, as in the first reference example , the drive shaft 55 is connected to the drive device of the grinding machine. 5 (
As shown in A) and (B), the brush-like grindstone 1 is rotated counterclockwise CCW, and the surface of the workpiece W arranged on the outer peripheral side of the brush-like grindstone 1 is ground on the tip side of the linear abrasive 2 To do.

  In this embodiment, the three holders 5 are stacked in three stages. However, in the single holder 5, the positions of the rows of embedded holes 53 formed at equal angular intervals in the circumferential direction are shifted in the direction of the axis L. A plurality of them may be formed. The number of holders 5 may be two or four or more.

[Modification of Reference Example 3 ]
In the reference example 3 described above, a configuration in which a plurality of linear abrasive materials 2 are formed as a plurality of abrasive material bundles 20 and held by a plurality of holders 5 is employed. A configuration may be employed in which a circumferential groove is formed and a plurality of linear abrasives 2 are held over the entire circumferential direction of the circumferential groove.

[ Reference Example 4 ]
FIG. 6 is a side view of a brush-like grindstone according to Reference Example 4 of the present invention. FIG. 7 is an explanatory view showing a usage example of the brush-like grindstone of the present embodiment. As in the first embodiment, the brush-like grindstone 1 shown in FIG. 6 also has a plurality of linear abrasives 2 formed by impregnating and solidifying a resin yarn in an aggregate yarn of alumina long fibers (inorganic long fibers), a metal holder 5 is held. The holder 5 has a cylindrical shape in which a shaft hole 51 penetrating in the direction of the axis L is formed in the center, and a rotary drive shaft 55 inserted into the shaft hole 51 by a screw (not shown) stopped from the side. It is connected to the holder 5.

  Two holders 5 are arranged in pairs in the axis L direction. A plurality of embedded holes 53 are formed at equal angular intervals in each of the outer peripheral side surfaces 57 of the two holders 5. In each of the plurality of embedded holes 53, a plurality of linear abrasives 2 are bundled in a round shape as an abrasive bundle 20 (an aggregate of the linear abrasives 2), and the base end side is a silicone resin type or an epoxy resin type It is fixed with an adhesive. Therefore, the plurality of linear abrasives 2 extend radially from the outer peripheral side surface 57 of the holder 5 as the abrasive bundle 20. In this embodiment, between the two holders 5 adjacent to each other, the holding position of the linear abrasive 2 is shifted in the circumferential direction. In addition, in the state made into the abrasive bundle 20, each of the plurality of linear abrasives 2 is in an independent state.

  Here, the linear abrasive 2 is curved to one side in the axis L direction from the proximal end side to the distal end side on one side of the two holders 5 that make a pair. Curved to one side in the direction of the axis L. On the other hand, on the other side of the two holders 5 that make a pair, the other side in the axis L direction is curved from the base end side to the tip end side. Curved to the side. Accordingly, the plurality of linear abrasives 2 held by the two holders 5 are curved in a direction in which the tip portions approach each other. Further, as shown in FIG. 1 (C), the linear abrasive 2 has an elliptical cross section or an elliptical cross section with the minor axis in the bending direction.

  When performing deburring grinding or surface grinding on the workpiece W using the brush-like grindstone 1 of this embodiment, with the drive shaft 55 connected to the drive device of the grinding machine, as shown in FIG. The brush-like grindstone 1 is rotated around the axis L, and the surface of the workpiece W arranged on the outer peripheral side of the brush-like grindstone 1 is ground on the tip side of the linear abrasive 2.

  Further, as shown in FIG. 7, after the male screw W12 is formed on the shaft body W11, if the brush-like grindstone 1 of this embodiment is used for finishing the male screw W12, the thread and the thread groove are efficiently finished. can do.

  Further, in this embodiment, since the two holders 5 are fixed to the common rotation drive shaft 55 with screws, when the linear abrasive 2 is worn out and shortened, the two holders 5 are brought closer to each other to form a linear shape. The positional relationship between the tips of the abrasive 2 can be adjusted.

  In the present embodiment, the structure in which the two holders 5 are arranged in two stages and the positional relationship can be adjusted is adopted. However, in the single holder 5, the rows of embedded holes 53 formed at equal angular intervals in the circumferential direction are arranged. Even if two rows are formed at positions shifted in the direction of the axis L, and the plurality of linear abrasives 2 are held in the direction in which the tip portions are curved toward each other with respect to the embedded holes 53 in each row. Good.

[Modification 1 of Reference Example 4 ]
In the reference example 4 described above, a configuration in which a plurality of linear abrasive materials 2 are formed as a plurality of abrasive material bundles 20 and held by a plurality of holders 5 is employed. A configuration may be employed in which a circumferential groove is formed and a plurality of linear abrasives 2 are held over the entire circumferential direction of the circumferential groove.

[Modification 2 of Reference Example 4 ]
In the reference example 4 , the tip portions of the plurality of linear abrasives 2 held by the two holders 5 are confronting each other, but as shown in FIG. 8, from the state shown in FIG. A configuration in which two holders 5 are brought close to each other and a plurality of linear abrasives 2 held by the two holders 5 cross each other may be adopted. In this case, in the workpiece W21, the inner surfaces of the protrusions W22 facing each other with a predetermined interval can be finished at the same time.

[ Reference Example 5 ]
9A and 9B are a plan view and a side view of a brush-like grindstone according to Reference Example 5 of the present invention. FIG. 10 is an explanatory view showing a usage example of the brush-like grindstone of the present embodiment. Similarly to the first embodiment, the brush-like grindstone 1 shown in FIGS. 9 (A) and 9 (B) also has a linear abrasive 2 made by impregnating and solidifying an aggregate of alumina long fibers (inorganic long fibers). It has a structure that is held by a plurality of metal holders 5. The holder 5 has a cylindrical shape in which a shaft hole 51 penetrating in the direction of the axis L is formed in the center, and a rotary drive shaft 55 inserted into the shaft hole 51 by a screw (not shown) stopped from the side. It is connected to the holder 5.

  In the brush-like grindstone 1 of this embodiment, a plurality of embedded holes 53 are formed at equal angular intervals on one end face 59 in the axis L direction of the holder 5. In each of the plurality of embedded holes 53, a plurality of linear abrasives 2 are bundled in a round shape as an abrasive bundle 20 (an aggregate of the linear abrasives 2), and the base end side is a silicone resin type or an epoxy resin type It is fixed with an adhesive. In this state, the linear abrasive 2 extends in the direction of the axis L. In addition, in the state made into the abrasive bundle 20, each of the plurality of linear abrasives 2 is in an independent state.

  Here, all the linear abrasives 2 are curved from the inner side to the outer side of the one end surface 59 of the holder 5 from the base end side to the tip end side, and accordingly, the entire abrasive bundle 20 is also moved from the inner side to the outer side. Is curved. Further, as described with reference to FIG. 1C, the linear abrasive 2 has a cross-sectional elliptical shape or a cross-sectional oval shape in which the minor axis is directed in the bending direction.

  When performing deburring grinding or surface grinding on the workpiece W using the brush-like grindstone 1 of this embodiment, with the drive shaft 55 connected to the drive device of the grinding machine, FIG. As shown in B), for example, the workpiece W is rotated counterclockwise CCW and the workpiece W having the surface (surface to be ground) directed in the direction of the axis L is ground on the tip side of the linear abrasive 2.

  Even in the brush-like grindstone 1 configured as described above, the linear abrasive 2 is impregnated and solidified with an inorganic long fiber aggregate yarn, as in the first embodiment, and thus has high hardness and high grinding ability. Have Further, each of the plurality of linear abrasives 2 is in a state of being curved from the proximal end side to the distal end side, and has a cross-sectional elliptical shape or a cross-sectionally long round shape with the minor axis in the bending direction. For this reason, the linear abrasive 2 is easily deformed in the bending direction. Therefore, the linear abrasive 2 is soft against the tip of the workpiece W, and even when an excessive force is applied to the unevenness of the surface of the workpiece W, the linear abrasive 2 is deformed and absorbs the excessive force, so that it does not break. Furthermore, since the linear abrasive 2 is fixed to the holder 5 in a state of being divided into the abrasive bundles 20, chips are efficiently discharged at the time of grinding and an effect such as a high heat dissipation effect is exhibited. .

  Further, the brush-like grindstone 1 of this embodiment has a finishing process for the female screw W32 formed on the workpiece W31 as shown in FIG. 10A, and a hole W34 formed in the workpiece as shown in FIG. 10B. It is suitable for finishing the inner peripheral surface, as shown in FIG. 10C, for deburring the intersection of intersection holes W36 and W37 formed in the workpiece 5.

[Modification of Reference Example 5 ]
In the reference example 5 described above, a configuration in which a plurality of linear abrasive materials 2 are formed into a plurality of abrasive material bundles 20 and held by the holder 5 is employed. A configuration in which a plurality of linear abrasives 2 are held over the entire circumferential direction of the circumferential groove may be employed.

[ Reference Example 6 ]
FIGS. 11A and 11B are a plan view and a side view of a brush-like grindstone according to Reference Example 6 of the present invention. FIG. 12 is an explanatory view showing a usage example of the brush-like grindstone of the present embodiment. As in the first embodiment, the brush-like grindstone 1 shown in FIGS. 11 (A) and 11 (B) also has a linear abrasive 2 made by impregnating and solidifying resin in an aggregate yarn of alumina long fibers (inorganic long fibers). It has a structure that is held by a plurality of metal holders 5. The holder 5 has a cylindrical shape in which a shaft hole 51 penetrating in the direction of the axis L is formed in the center, and a rotary drive shaft 55 inserted into the shaft hole 51 by a screw (not shown) stopped from the side. It is connected to the holder 5.

  In the brush-like grindstone 1 of this embodiment, a plurality of embedded holes 53 are formed at equal angular intervals on one end face 59 in the axis L direction of the holder 5. In each of the plurality of embedded holes 53, a plurality of linear abrasives 2 are bundled in a round shape as an abrasive bundle 20 (an aggregate of the linear abrasives 2), and the base end side is a silicone resin type or an epoxy resin type It is fixed with an adhesive. In this state, the linear abrasive 2 extends in the direction of the axis L. In addition, in the state made into the abrasive bundle 20, each of the plurality of linear abrasives 2 is in an independent state.

  Here, all of the linear abrasives 2 are curved from the outer side to the inner side of the one side end surface 59 in the direction of the axis L of the holder 5 from the base end side to the tip end side. Is also curved inward. Further, as described with reference to FIG. 1C, the linear abrasive 2 has a cross-sectional elliptical shape or a cross-sectional oval shape in which the minor axis is directed in the bending direction.

  When performing deburring grinding or surface grinding on the workpiece W using the brush-like grindstone 1 of this embodiment, with the drive shaft 55 connected to the drive device of the grinding machine, FIG. As shown in B), the workpiece W is rotated around the axis L, for example, counterclockwise CCW, and the workpiece W whose surface (surface to be ground) is directed in the direction of the axis L is ground on the tip side of the linear abrasive 2.

  Further, the brush-like grindstone 1 of the present embodiment includes a finishing process for the male screw W42 formed on the workpiece W41 as shown in FIG. 12A, and an outer periphery of the shaft-like workpiece W43 as shown in FIG. Suitable for finishing the surface.

  Even in the brush-like grindstone 1 configured as described above, the linear abrasive 2 is impregnated and solidified with an inorganic long fiber aggregate yarn, as in the first embodiment, and thus has high hardness and high grinding ability. Have Further, each of the plurality of linear abrasives 2 is in a state of being curved from the proximal end side to the distal end side, and has a cross-sectional elliptical shape or a cross-sectionally long round shape with the minor axis in the bending direction. For this reason, the linear abrasive 2 is easily deformed in the bending direction. Therefore, the linear abrasive 2 is soft against the tip of the workpiece W, and even when an excessive force is applied to the unevenness of the surface of the workpiece W, the linear abrasive 2 is deformed and absorbs the excessive force, so that it does not break. Furthermore, since the linear abrasive 2 is fixed to the holder 5 in a state of being divided into the abrasive bundles 20, chips are efficiently discharged at the time of grinding and an effect such as a high heat dissipation effect is exhibited. .

[Modification of Reference Example 6 ]
In the reference example 6 described above, a configuration is adopted in which a plurality of linear abrasives 2 are held in the holder 5 as a plurality of abrasive bundles 20, but a circumferential groove is formed on one end face 59 of the holder 5. A configuration in which a plurality of linear abrasives 2 are held over the entire circumferential direction of the circumferential groove may be employed.

[Other embodiments]
In any of the above forms, the linear abrasive material 2 was configured to be entirely curved from the proximal end side to the distal end side. For example, FIGS. 13 (A), 13 (B), and FIG. As shown in FIG. 14, a configuration in which the linear abrasive 2 is curved at one location from the proximal end side to the distal end side may be adopted. In producing such a brush-like grindstone 1, first, 1000 alumina long fibers (a single yarn of alumina long fibers) are bundled flat in an untwisted state and continuously wound (strands) ) Is dipped in a binder resin such as an epoxy resin, and impregnated with the binder resin. Next, for example, after winding up so that it does not overlap with the peripheral surface of the square roller whose corner portion is R, the binder resin is solidified, and then the linear abrasive 2 is cut out.

  In any of the above-described forms, an example in which a plurality of linear abrasives 2 formed by impregnating and solidifying an aggregate yarn of alumina long fibers (inorganic long fibers) is held in a metal holder 5 has been described. The present invention may be applied to the brush-like grindstone 1 using silicon carbide fibers, carbon fibers, silicon nitride fibers, or glass fibers as the inorganic long fibers.

  In any of the above forms, the linear abrasive material 2 is fixed to the holder 5 in a state of being subdivided as an abrasive bundle 20, or the circumferential groove without subdividing the linear abrasive material 2 as an abrasive bundle 20 However, the present invention may be applied to the brush-like grindstone 1 in which the linear abrasive 2 is held in the holder 5 as one bundle.

  In any of the above forms, the aggregate yarn used for the linear abrasive material 2 was not twisted, but the linear abrasive material 2 was configured using the twisted aggregate yarn. May be. In addition, the curved linear abrasive 2 may include a part of linear abrasive that extends linearly and is not curved.

  In the brush-like grindstone of the present invention, the linear abrasive material is formed by impregnating and solidifying a resin to the aggregate yarn of inorganic long fibers, so that the density of the inorganic long fibers that substantially function as an abrasive material is high and high. It is hard and strong, so it has high grinding ability. Further, the linear abrasive is in a curved state and easily deforms in the bending direction. Therefore, in the brush-like grindstone according to the present invention, compared to the brush-like grindstone in which the linear abrasive material extends linearly, the linear abrasive material has a softer contact with the workpiece at the tip and has an excessive force. When it is added, it deforms and absorbs excessive force, so it will not break.

Claims (8)

A plurality of linear abrasives obtained by impregnating and solidifying a resin to the aggregate yarn of inorganic long fibers, held by a holder whose outer peripheral side surface is a circumferential surface, and among the inorganic long fibers, the linear abrasive material In the rotary brush-like grindstone that grinds the workpiece with the exposed part at the tip of the
The inorganic long fiber is one of alumina fiber, silicon carbide fiber, carbon fiber, silicon nitride fiber, and glass fiber,
Each of the plurality of linear abrasives is curved in the same circumferential direction at at least one location from the base end side to the tip end side.   2. The brush-like grindstone according to claim 1, wherein each of the plurality of linear abrasives is curved from the proximal end side to the entire distal end side. 3. The brush-like grindstone according to claim 1, wherein each of the plurality of linear abrasives extends radially from the outer peripheral side surface of the holder and is curved in the same circumferential direction. A plurality of the holders are arranged in the axial direction of the holder,
The brush-like grindstone according to claim 3, wherein the plurality of linear abrasives are held in each of the plurality of holders. The brush-like grindstone according to any one of claims 1 to 4, wherein the plurality of linear abrasives are held in the holder in a plurality of bundles . 5. The plurality of linear abrasives are held in a circumferential groove formed on an outer peripheral side surface of the holder over the entire circumferential direction. 6. Brush-like grindstone. The brush shape according to any one of claims 1 to 6, wherein the plurality of linear abrasives have an elliptical cross-section or an elliptical cross-section with a minor axis in a bending direction. Whetstone. The brush-like grindstone according to any one of claims 1 to 7, wherein a drive shaft extends in an axial direction from the holder .

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