JP6462711B2 - Polishing brush - Google Patents

Description

  The present invention relates to a polishing brush having an abrasive holder for holding a plurality of linear abrasives.

  Such a polishing brush is described in Patent Document 1. In this document, a plurality of linear abrasives are divided into a plurality of abrasive bundles, and each abrasive bundle is held by an abrasive holder in a state of being separated from each other. Each abrasive bundle has a circular cross-sectional shape, and the abrasive holder includes a plurality of holding holes for holding the respective abrasive bundles. Each holding hole is circular and is provided apart from each other. Each abrasive bundle is fixed to the abrasive holder by an adhesive whose base end portion is inserted into each holding hole and filled in the holding hole.

International Publication No. 2004/009239

  In a polishing brush that holds an abrasive bundle in a holding hole having a shape corresponding to its cross-sectional shape, the diameter of the abrasive bundle is larger than the inner diameter of the holding hole at the time of manufacture, or the shape of the abrasive bundle is If the shape is different, the abrasive bundle cannot be inserted into the holding hole. Therefore, when manufacturing the polishing brush, the diameter and shape of the abrasive bundle in which the linear abrasive is bundled are strictly controlled within a predetermined range corresponding to the inner diameter and shape of the holding hole provided in the abrasive holder. There is a problem that must be done.

  In view of such a point, an object of the present invention is to propose a polishing brush that can easily hold a plurality of linear abrasives in an abrasive holder.

In order to solve the above-described problems, the present invention provides a polishing brush having a plurality of linear abrasives and an abrasive holder for holding the plurality of linear abrasives. The plurality of linear abrasives are subdivided into a plurality of abrasive bundles, and one end portion of the plurality of abrasive bundles is the same in a state where the abrasive bundles are separated from each other. Each linear abrasive is impregnated and solidified with an inorganic long fiber aggregate yarn, and is fixed to the abrasive holder by an adhesive inserted into the groove and filled in the groove. Features.

  According to the present invention, since the plurality of linear abrasives are inserted into the grooves and fixed by the adhesive, the shape when holding the plurality of linear abrasives on the abrasive holder is strictly controlled. These can be held on the abrasive holder.

According to the present invention, the plurality of linear abrasives are divided into a plurality of abrasive bundles, and each abrasive bundle is fixed to the abrasive holder in a state of being separated from each other. Therefore, even when the diameter and shape of the abrasive bundle are larger than the width of the groove, the base end portion of the abrasive bundle can be inserted into the groove by deforming the abrasive bundle along the groove. Therefore, the abrasive bundle can be held in the abrasive holder even when the diameter and shape of the abrasive bundle vary. Moreover, if it does in this way, since the abrasives bundle | flux hold | maintained at the abrasive material holder mutually spaces apart, chips will be discharged | emitted efficiently at the time of grinding. Furthermore, since the abrasive bundles held by the abrasive holder are separated from each other, the heat dissipation effect is high. Furthermore, the polishing brush can be configured with a smaller amount of abrasive material than in the case where the linear abrasive is held in the groove without any gap. Further, according to the present invention, each linear abrasive is obtained by impregnating and solidifying an inorganic long fiber aggregate yarn. Accordingly, since the linear abrasive using the inorganic long fiber has high hardness, the grinding / polishing ability of the polishing brush is improved even with a small amount of abrasive.

  In the present invention, the groove is an annular groove formed around a rotation center axis, and the plurality of abrasive bundles may be inserted into the annular groove at equal angular intervals. In this way, a cup-type polishing brush or wheel brush can be easily manufactured.

  In the present invention, each abrasive bundle may have a circular cross-sectional shape in a direction perpendicular to the length direction of each linear abrasive at the end portion of the abrasive bundle inserted into the groove. In this way, the abrasive bundle can be held in the abrasive holder without strictly managing the diameter dimension of the abrasive bundle.

1 is a perspective view of a polishing brush of Example 1. FIG. It is a disassembled perspective view of an abrasive brush. It is explanatory drawing of a polishing brush and a polishing brush main body. 6 is an explanatory diagram of a polishing brush of Example 2.

  Hereinafter, a polishing brush to which the present invention is applied will be described with reference to the drawings. In the following description, for the sake of convenience, the rotational center axis direction of the polishing brush is defined as the vertical direction of the polishing brush, corresponding to the top and bottom of FIG.

Example 1
FIG. 1 is an explanatory view of a polishing brush to which the present invention is applied. FIG. 2 is an exploded perspective view showing a state in which the polishing brush shown in FIG. 1 is disassembled into a brush case and a polishing brush body. 3A is a cross-sectional view when the polishing brush is cut at a fixed portion with a screw, FIG. 3B is a bottom view of the polishing brush, and FIG. 3C is a vertical cross-section of the polishing brush body. FIG.

  As shown in FIG. 1, the polishing brush 1 of this example includes a cup-shaped brush case 6 having a shank 5 connected to the head of a machine tool (grinding machine), and an upper portion inserted into the brush case 6. The polishing brush main body 7 and the screws 8 and 9 for fixing the polishing brush main body 7 to a predetermined position in the brush case 6 are provided.

  The brush case 6 is made of metal and includes a cylindrical peripheral wall 11 and a circular upper plate 12 that seals the upper end opening of the peripheral wall 11. The shank 5 extends upward from the central portion of the upper plate 12. A round bar-shaped support shaft 13 extends downward from a central portion of the lower surface of the upper plate 12. The support shaft 13, the shank 5 and the peripheral wall 11 are coaxial. The peripheral wall 11 of the brush case 6 is provided with guide holes 14 and 15 extending in a groove shape in parallel with the rotation center axis L. The guide holes 14 and 15 are formed at point-symmetric positions with the rotation center axis L interposed therebetween. In this example, the peripheral wall 11 of the brush case 6 is made of aluminum, and the support shaft 13 is made of stainless steel.

  As shown in FIG. 2, the polishing brush body 7 includes an abrasive bundle 22 in which a plurality of linear abrasives 21 are bundled, and an annular abrasive holder 23 that holds the plurality of abrasive bundles 22. The abrasive material holder 23 is made of metal. The center hole 24 of the abrasive material holder 23 is a shaft hole through which the support shaft 13 passes. A pair of screw holes 25 and 26 are formed in the abrasive material holder 23 at point-symmetric positions with the rotation center axis L interposed therebetween. As shown to Fig.3 (a), the screw holes 25 and 26 have penetrated the abrasive material holder 23 to radial direction.

  As shown in FIGS. 3B and 3C, the abrasive material holder 23 is an annular abrasive material holding groove (centered on the rotation center axis L) on the abrasive material holding surface 27 which is the lower end surface thereof. Groove) 28. In the plurality of abrasive bundles 22, the base end portions 22 a are inserted into the abrasive holding groove 28 in a state of being separated from each other, and the abrasive holder 23 is attached to the abrasive holder 23 by the adhesive 29 filled in the abrasive holding groove 28. It is fixed. The adhesive 29 is of a silicon resin type or an epoxy resin type. As shown in FIG. 3B, in this example, each abrasive bundle 22 is bundled in a circular shape. That is, each abrasive bundle 22 has a circular cross-sectional shape in a direction orthogonal to the length direction of each linear abrasive 21 at the end portion of the abrasive bundle 22 inserted into the abrasive holding groove 28. The plurality of abrasive bundles 22 are inserted and fixed in the abrasive holding grooves 28 at equal angular intervals. In a state where the abrasive bundle 22 is fixed to the abrasive holder 23, the abrasive bundle 22 protrudes downward from the abrasive holding surface 27 of the abrasive holder 23.

  Each linear abrasive 21 has a thermosetting binder such as a silicon resin, a phenol resin, an epoxy resin, a polyimide resin, a polymaleimide resin, an unsaturated polyester resin, a urethane resin or the like on an aggregate yarn of alumina long fibers as inorganic long fibers. A resin impregnated and cured. A thermoplastic resin such as nylon can also be used as the binder resin. In this example, the aggregate yarn is a collection of 250 to 3000 alumina long fibers having a fiber diameter of 8 to 50 μm. The diameter of the aggregate yarn is 0.1 mm to 2 mm. In some cases, the aggregate yarn may be twisted.

  Here, when the base end portion 22a of the abrasive bundle 22 is inserted into the abrasive holding groove 28, a plurality of subdivided linear abrasives 21 are simply gathered and bundled. It is. The plurality of linear abrasives 21 bundled in small portions were bound as an abrasive bundle 22 by the adhesive 29 when being fixed to the abrasive holder 23 by the adhesive 29 in the abrasive holding groove 28. It becomes a state.

  When the polishing brush 1 is constituted by the brush case 6 and the polishing brush body 7, first, the support shaft 13 is passed through the center hole 24 (shaft hole) of the abrasive material holder 23, and the polishing brush is placed inside the brush case 6. The upper part of the main body 7 (the abrasive material holder 23 side) is inserted. Next, the screws 8 and 9 are passed through the guide holes 14 and 15 from the outer peripheral side of the brush case 6, and the screws 8 and 9 are fixed to the screw holes 25 and 26 of the abrasive material holder 23, respectively. At this time, the screws 8 and 9 are tightened until the tips of the shaft portions of the screws 8 and 9 abut against the outer peripheral surface of the support shaft 13. Thereby, the abrasive material holder 23 is fixed to the support shaft 13 of the brush case 6 via the screws 8 and 9. Of the outer peripheral surface of the support shaft 13, the periphery of the region where the tips of the screws 8 and 9 hit is a flat surface.

(Machining operation)
When deburring the workpiece or grinding / polishing the surface using the polishing brush 1, the shank 5 is connected to the head of the machine tool and rotated around the rotation center axis L, so that the abrasive bundle 22 Press the free end (lower end) against the surface of the workpiece. Here, when the linear abrasive 21 constituting the abrasive bundle 22 is worn by the machining operation and the projecting dimension from the lower edge 6a of the brush case 6 is shortened, the guide holes 14 and 15 are interposed. Then, the screws 8 and 9 fixed to the abrasive material holder 23 are loosened. Thereafter, the polishing brush body 7 is moved in the direction of the rotation center axis L inside the brush case 6, and then the screws 8 and 9 are tightened. Thereby, the position in the direction of the rotation center axis line L of the polishing brush body 7 inside the brush case 6 is adjusted, and the protruding dimension of the free end of the linear abrasive 21 from the brush case 6 is adjusted.

(Function and effect)
According to this example, the abrasive bundle 22 is not inserted into the holding hole corresponding to the cross-sectional shape thereof, but is inserted into the abrasive holding groove 28 provided in the abrasive holder 23 to hold the abrasive bundle. It is fixed by an adhesive 29 filled in the groove 28. Therefore, even when the diameter dimension of the abrasive bundle 22 is larger than the width of the abrasive holding groove 28, the proximal end portion of the abrasive bundle 22 can be obtained by deforming the abrasive bundle 22 along the abrasive holding groove 28. 22 a can be inserted into the abrasive holding groove 28. Therefore, the abrasive bundle 22 can be held in the abrasive holder 23 even when the diameter of the abrasive bundle 22 in which the linear abrasive 21 is bundled varies.

  Moreover, in this example, since the abrasive material bundle | flux 22 hold | maintained at the abrasive material holder 23 is mutually spaced apart, chips are discharged | emitted efficiently at the time of a grinding process. Further, since the abrasive bundles 22 held by the abrasive holder 23 are separated from each other, the heat dissipation effect is high. Furthermore, compared with the case where the linear abrasive 21 is held in the abrasive holding groove 28 without a gap, the polishing brush 1 can be configured with a smaller amount of abrasive.

  Furthermore, in this example, each linear abrasive 21 is made by impregnating and solidifying an inorganic long fiber aggregate yarn, and has high hardness. Therefore, the abrasive holder 22 is separated from each other with a plurality of abrasive bundles 22 separated from each other. Even when held at 23, the grinding brush 1 has high grinding and polishing ability.

(Example 2)
4A is an explanatory diagram of a polishing brush according to a second embodiment to which the present invention is applied, and FIG. 4B is a perspective view of an abrasive material holder of the polishing brush according to the second embodiment. In addition, since the polishing brush 51 of Example 2 is provided with the structure corresponding to the polishing brush 1 of Example 1, the same code | symbol is attached | subjected to a corresponding part and the description is abbreviate | omitted.

  As shown in FIG. 4A, the polishing brush 51 includes a shank member 52 having a shank 5 connected to a head (drive device) of a machine mechanism, and an annular abrasive material holder through which a lower portion of the shank member 52 passes. 23, a lock nut 53 screwed into the lower end portion of the shank member 52 is provided. The outer peripheral side surface of the abrasive holder 23 is an abrasive holding surface 27, and a plurality of abrasive bundles 22 protrude radially from the abrasive holding surface 27 toward the outer peripheral side. The abrasive material holder 23 and the abrasive material bundle 22 constitute an abrasive brush body 7.

  The shank member 52 includes a shank 5, a flange portion 54, and a bolt portion 55 from above to below. On the outer peripheral surface of the bolt portion 55, a male screw that is screwed into the set nut 53 is formed. The shank member 52 has a lower portion than the flange portion 54 inserted into the center hole 24 (see FIG. 4B) of the abrasive holder 23, and a lower end portion of the bolt portion 55 protruding downward from the abrasive holder 23. ing.

  The abrasive material holder 23 includes an annular abrasive material holding groove (groove) 28 formed on the abrasive material holding surface 27 around the rotation center axis L. In the plurality of abrasive bundles 22, the base end portions 22 a are inserted into the abrasive holding groove 28 in a state of being separated from each other, and the abrasive holder 23 is attached to the abrasive holder 23 by the adhesive 29 filled in the abrasive holding groove 28. It is fixed. In this example, the plurality of abrasive bundles 22 are inserted and fixed in the abrasive holding grooves 28 at equal angular intervals. Each abrasive bundle 22 is obtained by bundling a plurality of linear abrasives 21 formed by impregnating and solidifying an inorganic long fiber aggregate yarn. Each abrasive bundle 22 is bundled in a circular shape.

  The lock nut 53 is screwed into the lower end portion of the bolt portion 55 protruding downward from the abrasive material holder 23 from below. The retaining nut 53 is screwed into the bolt portion 55 until the abrasive holder 23 is sandwiched between the flange portion 54 of the shank member 52 and the retaining nut 53, whereby the abrasive holder 23 is fixed to the shank member 52. ing.

  When deburring the workpiece or grinding / polishing the surface using the polishing brush 51, the shank 5 is connected to the head of the machine tool and rotated around the rotation center axis L, so that the abrasive bundle 22 Press the free end (outer end) against the workpiece surface. When the linear abrasive 21 constituting the abrasive bundle 22 is worn by the machining operation, the set nut 53 is loosened and removed from the shank member 52, and the abrasive holder 23 is removed from the shank member 52 for polishing. Replace only the brush body 7 with a new one.

  According to this example, it is possible to obtain the same effects as those of the first embodiment.

(Other embodiments)
In each embodiment, a plurality of abrasive material holding grooves 28 can be provided in the abrasive material holder 23. The abrasive holding groove 28 can also be provided in a straight line on the abrasive holding surface 27.

  In the above example, the plurality of linear abrasives 21 are bundled in a circular shape, but may be bundled in other shapes. For example, the plurality of linear abrasive materials 21 are bundled so that the cross-sectional shape of the base end portion 22a inserted into the abrasive material holding groove 28 as the abrasive material bundle 22 is an ellipse, a rectangle, or a square. Also good.

Further, the linear abrasive 21 can be made by impregnating and solidifying an aggregate yarn such as silicon carbide fiber, carbon fiber, silicon nitride fiber, or glass fiber . Also, it may be a square cross-sectional shape of the Togizaitaba 22.

Claims (3)

In a polishing brush having a plurality of linear abrasives and an abrasive holder for holding the plurality of linear abrasives,
A groove is formed in the abrasive material holder,
The plurality of linear abrasives are subdivided into a plurality of abrasive bundles, and one end portion of the plurality of abrasive bundles is inserted into the same groove in a state where the respective abrasive bundles are separated from each other. Fixed to the abrasive material holder by an adhesive filled in the groove ,
A polishing brush , wherein each linear abrasive is obtained by impregnating and solidifying an aggregate of inorganic long fibers with a resin . In claim 1,
The groove is an annular groove formed around a rotation center axis,
The abrasive brush, wherein the plurality of abrasive bundles are inserted into the annular groove at equal angular intervals. In claim 1,
Each abrasive bundle has a circular cross-sectional shape in a direction perpendicular to the length direction of each linear abrasive at the end portion of the abrasive bundle inserted into the groove.

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