JP2009028801A - Brush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brush capable of maintaining excellent production efficiency for surface processing such as cutting of burrs generated on a workpiece and the like. <P>SOLUTION: Brush bristles 2 of the brush 1 include brush bristles 2a in an edge normal rotational direction and brush bristles 2b in an edge reverse rotational-direction in which an edge 73 of bristles tip faces in a normal rotational direction t1 and in a reverse rotational direction ht1, respectively. The edge normal rotational direction brush bristles 2a and the edge reverse rotational direction brush bristles 2b are approximately 60% and approximately 40%, respectively. The edge 73 of the edge normal rotational direction brush bristles 2a cuts a left side burr completely by rotation of the brush 1 in the normal rotational direction t1, and then cuts the burr which partially remains during rotation in the normal rotational direction t1 by rotation of the brush 1 in the reverse rotational direction ht1. Therefore, it is possible to properly cut the burr on the workpiece with the one brush 1, thus expediting improvement of the production efficiency. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a brush used for surface treatment such as deburring of a workpiece and cutting of a deposit on the workpiece.

  In parts used in automobiles and the like, burrs may be generated on the surface of the parts in processing steps such as punching. This burr is removed using, for example, a brush having brush bristles. As an example of such a brush, as shown in FIGS. 8A, 8B, 8C, and 8D, a large number of bristles 61 and a large number of holes 62 are formed in the outer peripheral surface portion. There is a brush 60 provided with a columnar holding member 63, and the plurality of brush bristles 61 are inserted into holes of the columnar holding member to hold them.

For example, as shown in FIG. 9, the brush 60 is configured such that the tip (brush tip) of the brush bristles 61 comes into contact with a plate material (hereinafter referred to as a polishing plate material) 10 coated with an abrasive. FIG. 9 Most brush hairs 61 (brushes) are obtained by rotating counterclockwise (hereinafter referred to as “rotation direction during polishing”) 71 (hereinafter referred to as “rotation during polishing”) and polishing the tip of the brush bristles 61. An inclined surface 72 (tip surface) is formed on the front side portion in the rotational direction 71 during polishing of the brush 60 at the tip of 70 to 100% of the hair bristles (see Patent Document 1). Due to the formation of the inclined surface 72, an edge 73 is formed on the rear side of the rotation direction 71 during polishing at the tip of the bristle 61. Here, the edge 73 has a high level position portion (a height from the base end of the brush bristles 61 in the outer peripheral edge 75) in the outer peripheral edge 75 formed by the inclined surface 72 (tip surface) and the outer peripheral surface of the brush 60. The neighborhood portion including the highest highest level position).
The direction of the edge 73 refers to a direction from the portion on the outer peripheral surface portion 76 of the bristle 61 opposite to the edge 73 toward the portion on the outer peripheral surface portion of the brush bristle 61 where the edge 73 is formed.

The brush 60 utilizes the fact that the tip of the bristle 61 is polished as described above, in other words, that the edge 73 is formed at the tip of the brush bristle 61 as described above. As shown in FIG. 10, the brush 60 is rotated in a direction 71 g opposite to the rotation direction 71 during polishing (hereinafter referred to as the burr removal rotation direction) 71 g and the edge 73 of the brush bristles 61 is brought into contact with the burr generation portion of the component W <b> 1. The burr 80 is cut and removed. In this case, the burr 80 is cut by rotating the brush 60 so that the direction of the edge 73 of the bristles faces the burr removal rotation direction 71g.
JP-A 61-209871

  However, in the above-described prior art, the cutting force differs depending on the direction in which the brush 60 is rotated (the polishing rotation direction 71 and the burr removal rotation direction 71g), and depending on the rotation direction, the burr removal cannot be performed properly. Specifically, when the brush 60 rotates in the burr removal rotation direction 71g (in other words, the edge 73 of the bristles 61 is rotated toward the burr removal rotation direction 71g), the brush 60 exhibits a cutting force. . On the other hand, the cutting force that can be exerted when rotating in the rotational direction 71 during polishing is extremely small, and burrs cannot be removed sufficiently.

  Note that even if the cutting force is exhibited as described above, it may be difficult to cut the burr 80 depending on the formation position of the burr 80. For example, as shown in FIG. 10, when the hole 81 is formed by punching the part W <b> 1 from the bottom to the top in FIG. 10, a burr 80 is generated in the opening portion of the hole 81 on the upper side in FIG. 10. Sometimes. Even if the brush 60 is rotated so as to exert the cutting force as described above, the left burr 80L in FIG. 10 (hereinafter, referred to as the left burr 80L as appropriate) can be removed by cutting, but FIG. The right burr 80R (hereinafter referred to as the right burr 80R as appropriate) may not be cut appropriately.

  In order to improve the above problem, regarding the attachment of the bristle 61 to the outer peripheral portion of the cylindrical holding member 63, the brush holding the bristle 61 so that the direction of the edge 73 is in one direction and the orientation of the edge 73 are It is conceivable to prepare two brushes with the brush holding the bristle 61 so as to be in the opposite direction to the one direction, and to remove burrs with these two brushes. However, in this case, the production efficiency is significantly reduced with the use of two brushes.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a brush capable of performing surface treatment such as cutting of burrs generated on a workpiece while maintaining a good production efficiency.

(Mode of Invention)
The invention of the present application is a brush that includes a plurality of brush bristles and a holding member that holds the bristles and acts on a workpiece to perform a surface treatment thereof. Is applied to the workpiece in one direction and in the opposite direction which is the opposite direction to the one direction, and the bristles whose edge direction is directed in the one direction (hereinafter referred to as edge one-direction brush hairs) And bristles whose edge direction is directed in the opposite direction (hereinafter referred to as edge-reversed brush hairs) are both approximately half of the plurality of brush hairs. .
According to the brush of the present invention, surface treatment such as cutting of burrs generated on the workpiece can be performed while maintaining a good production efficiency.

  In the following, some aspects of the invention that can be claimed in the present application (hereinafter sometimes referred to as “claimable invention”) will be exemplified and described. As with the claims, each aspect is divided into sections, each section is numbered, and is described in a form that cites the numbers of other sections as necessary. This is for the purpose of facilitating the understanding of the claimable invention, and is not intended to limit the combinations of the constituent elements constituting the claimable invention to those described in the following sections. In other words, the claimable invention should be construed in consideration of the description accompanying each section, the description of the embodiments, etc., and as long as the interpretation is followed, another aspect is added to the form of each section. In addition, an aspect in which constituent elements are deleted from the aspect of each item can be an aspect of the claimable invention.

The present invention is configured in the following aspects (1) to (6). The aspects of (1) and (3) to (5) correspond to claims 1 to 4, respectively.
(1) A brush that includes a plurality of brush bristles and a holding member that holds the brush bristles and that performs surface treatment by acting on a workpiece. It is performed by acting in one direction and the opposite direction to the one direction with respect to the workpiece, and the bristles whose edge direction is directed in the one direction (hereinafter referred to as edge unidirectional brush bristles). ) And the bristle whose edge direction is directed in the opposite direction (hereinafter referred to as edge-reversed brush hair) are both approximately half of the multiple brush hairs.
Here, the edge is a high-level position portion in the outer peripheral edge formed by the front end surface and outer peripheral surface of the brush hair (the vicinity including the highest level position where the height from the base end of the brush hair in the outer peripheral edge is the highest) Part). Further, the direction of the edge of the bristles refers to the direction from the portion on the outer peripheral surface portion of the bristle opposite to the edge toward the portion on the outer peripheral surface portion of the brush bristle.

(2) The brush hair whose direction of the edge of the hair tip is directed in one direction is 50 to 60% of the large number of brush hairs, and the brush hair whose direction of the edge of the hair tip is directed in the opposite direction is the large number of brush hairs. The bristles that are 50 to 40 percent of the bristles, or the bristles that are oriented in one direction, are 50 to 40 percent of the bristles, and the bristles are oriented in the opposite direction. The brush according to item (1), wherein the brush hairs facing are 50 to 60 percent of the plurality of brush hairs.
(3) The holding member has an axial shape, and the plurality of brush bristles are arranged on an outer peripheral surface of the holding member, and the one direction and the opposite direction are each one centered on the longitudinal direction of the holding member. The brush according to item (1) or (2), wherein the brush has a rotation direction and a reverse rotation direction opposite to the one rotation direction.

(4) The holding member has a plate shape having a flat portion, and the plurality of brush bristles are arranged on the flat portion, and the one direction and the opposite direction are respectively one direction and the one along the flat portion. The brush according to item (1) or (2), wherein the brush is in a direction opposite to the direction.
(5) The brush according to any one of (1) to (4), wherein the brush bristles are made of a rigid material.
(6) The brush according to item (5), wherein the rigid material is an iron material.
According to the brush described in the items (1) to (6), by causing the brush to act in one direction and in the opposite direction with respect to the workpiece, the brush hair in one direction facing the edge is subjected to burr cutting force or the like during the one-way action. The surface treatment of the workpiece is performed by demonstrating the large surface treatment ability for the workpiece of the workpiece, and when the reverse action is applied, the edge bristle brush in the reverse direction exhibits the large surface treatment capability for the workpiece such as burr cutting force. I do. For this reason, the surface treatment of the workpiece can be appropriately performed with one brush, as compared with the case of preparing two brushes, a brush having brush hairs facing in one direction of edge and a brush having brush hairs facing in opposite direction of edge. , Improve production efficiency.

  According to invention of Claims 1-4, surface treatments, such as cutting of the burr | flash which generate | occur | produced in the workpiece | work, can be performed, maintaining favorable production efficiency.

Hereinafter, a brush according to a first embodiment of the present invention will be described with reference to the drawings.
1 to 3, the brush 1 is roughly composed of a large number of iron brush bristles 2 and a steel shaft holding member 3 (holding member) that holds the bristles 2. (See FIG. 5), the burr 80 (see FIG. 5) generated on the workpiece W is removed (surface treatment is performed). The shaft-shaped holding member 3 has a large number of holes 4 (see FIG. 4) formed on the outer periphery thereof. A shaft 6 connected to the drive mechanism via a holder 5 (see FIG. 4) is inserted through the central portion of the shaft-shaped holding member 3.
The shaft-like holding member 3 and the brush 1 are rotated in the forward rotation direction t1 [one direction] and the reverse rotation direction ht1 through the holder 5 by the operation of a drive mechanism such as a motor. The brush bristles 2 are inserted and held in the holes 4 of the shaft-shaped holding member 3.

  A large number of brush bristles 2 have an edge 73 formed at each hair tip. The edge 73 is formed by rotating the brush 1 in the forward rotation direction t1 and the reverse rotation direction ht1 with the polishing plate 10 (see FIG. 9) in contact with the tip (bristles) of the brush bristles 2 to contact the brush. This is done by polishing the tip of the bristles 2. In this brush 1, the edge 73 is formed so that the bristle edge 73 is oriented in the positive rotation direction t <b> 1 (hereinafter referred to as the edge positive rotation direction brush bristles 2 a for convenience) and the bristle tip. The brush bristles 2 whose edges 73 are directed in the reverse rotation direction ht1 (hereinafter referred to as “brush bristles 2b in the reverse edge rotation direction” for convenience) are approximately half of the multiple bristles 2. Specifically, the edge bristles 2a in the direction of normal rotation of the edge are about 60% of the whole bristles 2, and the bristles 2b in the direction of reverse rotation of the edges are about 40% of the whole bristles 2.

  The shape of the tip of the brush bristles 2 is not limited to a specific shape. In the first embodiment, as the bristles 2, for example, those shown in FIGS. 6 (a1) and (a2), 6 (b1) and (b2), those shown in FIGS. 6 (e1) and (e2), and those shown in FIGS. 6 (f1) and (f2) may be included. As will be described later, when the bristle 2 is formed with an edge 73 and the brush bristle 2 with the edge 73 formed is attached to the shaft-like holding member 3 of the brush 1, FIGS. 6 (c1) and 6 (c2) As shown, the bristles 2 in which the recesses 30 are formed in the inclined surface 72 may be included. Similarly, when the bristle 2 having the edge 73 is attached to the shaft-like holding member 3 of the brush 1, as shown in FIGS. 6 (d1) and 6 (d2), the outer surface of the bristle 2 is The bristle 2 which has the notch 31 on the edge 73 formation side may be included. In FIG. 6, (a1) to (f1) are plan views of each type of bristles 2, and (a2) to (f2) are brush bristles shown corresponding to (a1) to (f1), respectively. FIG.

As described above, the brush 1 rotates in the forward rotation direction t1 and the reverse rotation direction ht1, and the burr 80 of the workpiece W is cut and removed by this rotation.
That is, when the brush 1 rotates in the forward rotation direction t1, the edge 73 of the bristle 2a facing the edge in the forward rotation direction causes the burr 80 on the left side and the right side of FIG. 5B (hereinafter, the left side and right side burr 80L, 80R). Cutting). At this time, the right burr 80R in FIG. 5 may not be sufficiently cut and may be partially left, but the left burr 80L in FIG. 5 is surely cut. Subsequently, when the brush 1 is rotated in the reverse rotation direction ht1, the edge 73 of the brush bristles 2b facing the edge in the reverse rotation direction has left-side burr 80R partially left by cutting during the rotation in the normal rotation direction t1. To cut.
For this reason, the burr | flash 80 of the workpiece | work W [the left side of FIG. 5, the right side burr | flash 80L, 80R] can be appropriately cut and removed with one brush 1, and the improvement of a production efficiency can be aimed at.

The above-described prior art (FIGS. 8 to 10) in which the edge 73 of the hair tip is in only one direction and the burr 80 is cut and removed by rotating the brush 1 in the one direction is sufficient. In some cases, burrs cannot be removed. However, according to the present embodiment, the above-described problems caused by the conventional technique can be avoided, and the burrs 80 can be removed satisfactorily.
In addition, in order to appropriately cut and remove the burr 80, when using two brushes, a brush whose edge 73 is in one direction and a brush whose edge 73 is opposite to one direction. In comparison, the number of brushes is reduced, and the production efficiency is improved.
In the first embodiment, the brush 1 is used as a surface treatment for cutting / removing the burr 80 of the workpiece W1. However, the usage mode of the brush 1 is not limited to this and is attached to the workpiece. You may use for other surface treatments, such as removal of what was done.

The inventors of the present application verified the present embodiment as a workpiece W, as shown in FIGS. 4 and 5, for a part (hereinafter referred to as a workpiece) used in a transmission of an automatic transmission.
As shown in FIGS. 4 (a), 4 (b), 5 (a), and 5 (b), the work W connects the small diameter portion 20 and the large diameter portion 21 with a step, and is predetermined to the small diameter portion 20 in the circumferential direction. A number (13 in this embodiment) of holes 22 are formed. The hole 22 of the workpiece W is formed by punching from the outside toward the inside of the small diameter portion 20 by punching. FIG. 5B shows only three of the thirteen holes 22.
As shown in FIG. 5B, the hole 22 is a long hole extending in the axial direction of the workpiece W, and two long side edges of each hole 22 are in the height direction of the workpiece W [FIG. ) In a vertical direction]. As shown in FIG. 5B, the two long side edges of each hole 22 are referred to as the left and right long side edges 23L and 23R, respectively, when the small diameter part 20 is viewed. FIG. 5B shows the left and right long side edges 23L and 23R for only the center hole 22 among the three holes 22 displayed in the figure. Similarly, the left and right burrs 80L and 80R are described only for the central hole 22 as well.

On the inside of the left and right long side edge portions 23L and 23R (FIG. 5 (b) on the other side of the paper surface), as shown in FIGS. 5 (c) and 5 (d), the small diameter portion 20 is directed from the outside to the inside. The burr 80 is formed in accordance with the punching performed in the above.
In the verification example shown in FIG. 5, as shown in FIGS. 4A and 4B, the brush 1 connected to the drive mechanism via the holder 5 is arranged on the inner peripheral side of the work W and is in the forward rotation direction t <b> 1. Machining (contouring) on the workpiece W while revolving and revolving in the revolving normal direction t2 corresponding to the normal rotating direction t1, and revolving in the revolving reverse direction ht2 corresponding to the reverse rotating direction ht1 while rotating in the reverse rotating direction ht1. ) Is performed.
In this case, the brush 1 is rotated forward by decentering the shaft 6 of the brush 1 from the center C1 of the inner peripheral wall of the work W so that the bristles of the brush 1 can contact the burr 80 of the work W. The brush 1 is rotated in the direction t1 and the reverse rotation direction ht1, and the brush 1 is revolved along the inner peripheral surface of the workpiece W together.

  In the verification example shown in FIG. 5, the brush 73 rotates and revolves clockwise in FIG. 4 (forward rotation direction t <b> 1 and revolution forward direction t <b> 2), whereby the edge 73 of the edge bristles 2 a facing the edge forward rotation direction is long leftward. The burr 80L of the edge 23L is cut and removed. Thereafter, the brush 1 rotates and revolves counterclockwise in FIG. 4 (reverse rotation direction ht1, revolution reverse direction ht2), so that the edge 73 of the edge bristles 2b facing in the reverse rotation direction is on the right long side edge 23R. The burr 80R was cut and removed. In this way, by rotating and revolving the brush 1 in the clockwise direction (forward rotation direction t1, revolution normal direction t2) and counterclockwise direction (reverse rotation direction ht1, reverse rotation direction ht2) in FIG. It was verified that the burrs 80L and 80R of the edge portions 23L and 23R were removed together.

In the first embodiment, the brush 1 has been described as an example in which the brush bristles 2 are directly provided on the shaft-shaped holding member 3, but instead, a large number of bristles bent into a substantially V shape, A so-called channel composed of a band-like body sandwiched between the bent portions of the bristle and a shaft-like body that winds and holds the band-like body so that the ends of the bristle face outward. It may be a type of roll brush.
In the first embodiment, the edge bristles 2a in the normal direction of rotation of the edges are about 60% of the whole bristles 2, and the bristles 2b in the direction of reverse rotation of the edges are about 40% of the whole bristles 2, However, the present invention is not limited to this, and the edge bristle rotation direction brush bristles 2a may be 50 to 60% of the whole, and the edge reverse rotation direction bristles 2b may be 50 to 40%. On the contrary, the edge bristles 2a in the normal direction of rotation of the edge may be 50 to 40% of the whole, and the bristles 2b in the direction of the reverse direction of rotation of the edge may be 50 to 60%.

In the first embodiment, the edge 73 of the bristles 2 is formed by rotating the brush 1 with the bristles 2 attached to the polishing plate 10 forward and backward. The invention is not limited to this. For example, an edge 73 may be formed on the brush bristles 2 in advance, and the brush bristles 2 formed with the edges 73 may be attached to the shaft-shaped holding member 3 of the brush 1. This also applies to the second embodiment described later. When the brush 1 having the edge 73 formed in this way is mounted on the shaft-like holding member 3 to constitute the brush 1, the direction (number) of the edges 73 can be managed with high accuracy.
Moreover, in the said embodiment, although the bristle 2a for edge normal rotation direction direction and the bristle 2b for edge reverse rotation direction are arrange | positioned at random, the predetermined number of edge bristles 2a for direction of positive rotation direction and the predetermined number of edge reverses The rotation direction brush bristles 2b may be set as a set, and each set may be arranged randomly or in a predetermined positional relationship. This also applies to the second embodiment described later.

Next, a brush according to a second embodiment of the present invention will be described with reference to FIG. 10 based on FIGS. 7 (a), (b), and (c).
The brush 1 of the first embodiment has a shaft-like holding member 3, and a plurality of brush hairs 2 are radially attached to the outer peripheral surface portion thereof, and the brush 1 is rotated and used. The forward rotation direction is t1 (FIG. 4 (b) clockwise) and the reverse rotation direction ht1 (FIG. 4 (b) counterclockwise). On the other hand, the brush 1A according to the second embodiment is configured as follows. That is, the brush 1A according to the second embodiment has a rectangular parallelepiped (plate-like) plate-like holding member 41 (holding member) having a rectangular plane portion 40, as shown in FIG. Iron brush bristles 2 are implanted in the flat portion 40 of the plate-like holding member 41. A shaft 42 is attached to the plate-like holding member 41. The brush 1A moves in the left-right direction in FIG. 7C (referred to as the first and second directions gL and gR, respectively for convenience) when the shaft 42 receives the driving force of a driving mechanism such as a linear motor. 1. Acts on a workpiece (in this embodiment, for the sake of convenience, the workpiece W1 shown in FIG. 10) and moves the burr 80 (FIG. 10) of the workpiece W1 when moving in the second direction gL, gR. It is removed by cutting. In the second embodiment, the direction from right to left and the direction from left to right in FIG. 10 correspond to the first and second directions gL and gR, respectively.
7 (a), 7 (b), and 7 (c), a large number of brush bristles 2 are brush bristles in which the direction of the edge 73 of the bristles faces in the direction opposite to the shaft 42 (hereinafter referred to as edge bristles opposite to the edge axis). .) 2c, and bristles 2d in which the direction of the edge 73 of the bristles is directed to the shaft 42 (hereinafter referred to as edge-axis-facing brush bristles) 2d.
The edge bristles 2c are about 60% of the whole bristles 2, and the edge axis bristles 2d are about 40% of the whole bristles 2.

In the second embodiment, the brush 1A is moved in the first and second directions gL and gR, and the burr 80 (FIG. 10) of the workpiece W1 is cut and removed by this movement. At this time, when the brush 1A moves in the first direction gL, the brush bristles 2c opposite to the edge axis cut the left and right burrs 80L and 80R in FIG. At this time, the right burr 80R in FIG. 10 may not be sufficiently cut and a part of the left burr 80R may remain, but the left burr 80L in FIG. 10 is surely cut. Subsequently, when the brush 1 moves in the second direction gR, the edge 73 of the edge-axis-oriented brush bristles 2d is partially left by cutting during the movement in the first direction gL. To cut.
For this reason, the burr | flash 80 (FIG. 10) of the workpiece | work W can be appropriately cut and removed with one brush 1A, and the improvement of production efficiency can be aimed at.

  In the second embodiment, the brush hair 2c opposite to the edge axis 2c is about 60% of the entire brush hair 2 and the brush hair 2d facing the edge axis is about 40% of the entire brush hair 2. However, the present invention is not limited to this. Alternatively, the brush hair 2c opposite to the edge axis 2c may be 50 to 60% of the whole, and the brush hair 2d facing the edge axis may be 50 to 40%. On the other hand, the brush hairs 2c opposite to the edge axis 2c may be 50 to 40% of the whole, and the brush hairs 2d facing the edge axis may be 50 to 60%.

  In each said embodiment, although the case where the bristle 2 was iron was taken as an example, other rigid materials other than iron, and other members (It is desirable that it is a material higher than the hardness of the workpieces W and W1.) You may comprise.

It is a top view which shows typically the brush which concerns on 1st Embodiment of this invention. It is a figure of A arrow of FIG. It is a figure of B arrow of FIG. The verification example of the brush which concerns on 1st Embodiment is shown, (a) is sectional drawing which shows a brush and a workpiece | work typically, (b) is a top view which shows the brush and a workpiece | work. 4 shows a brush and a workpiece in the verification example of FIG. 4, (a) is a plan view of the workpiece, (b) is a side view of the workpiece, (c) is a perspective view showing an enlarged left burr forming portion of (b), (D) is a perspective view which expands and shows the right side burr | flash formation part of (b). Various types of brush bristles with different tip shapes used in the first embodiment or the like are used as (a1) and (a2), (b1) and (b2), (c1) and (c2), (d1) and It is a figure shown to (d2), (e1) and (e2), and (f1) and (f2), respectively. The brush which concerns on 2nd Embodiment of this invention is shown, (a) is the front view, (b) is the top view, (c) is the partial enlarged front view. A conventional example brush is shown, (a) is a plan view thereof, (b) is a front view thereof, (c) is a plan view of brush bristles used for the brush, and (d) is a front view of brush bristles. . It is a schematic diagram for demonstrating grinding | polishing of the bristle itself of the brush of FIG. 8, and cutting of the burr | flash with a brush. It is a figure of the partial cross section for demonstrating the burr cutting method with the brush of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Brush, 2 ... Brush hair, 2a ... Edge bristle direction brush hair, 2b ... Edge reverse rotation direction brush hair, 2c ... Edge axis opposite brush hair, 2d ... Edge axial brush hair, 3 ... Shaft shape Holding member (holding member), 41 ... plate-like holding member (holding member), 80 ... burr, W, W1 ... workpiece.

Claims (4)

In a brush comprising a large number of brush bristles and a holding member for holding the bristles and acting on a workpiece to perform surface treatment thereof,
The surface treatment of the workpiece of the brush is performed by causing the brush to act on the workpiece in one direction and in the opposite direction that is opposite to the one direction,
The brush bristles in which the direction of the edge of the bristles is directed in the one direction and the brush bristles in which the direction of the edge of the bristles is directed in the opposite direction are both about half of the plurality of brush bristles. .   The holding member has an axial shape, and the plurality of brush bristles are disposed on an outer peripheral surface of the holding member, and the one direction and the opposite direction are respectively one rotation direction centered on the longitudinal direction of the holding member and The brush according to claim 1, wherein the brush has a reverse rotation direction opposite to the one rotation direction.   The holding member has a plate shape having a flat portion, and the plurality of brush bristles are disposed on the flat portion, and the one direction and the opposite direction are opposite to the one direction and the one direction along the flat portion, respectively. The brush according to claim 1, wherein the brush is a direction.   The brush according to any one of claims 1 to 3, wherein the brush bristles are made of a rigid material.

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