JP6421267B1 - Polishing brush polishing method - Google Patents

Abstract

A polishing brush polishing method capable of obtaining a desired grinding force when a workpiece to be polished is a curved surface.
A polishing brush includes a plurality of abrasive bundles arranged in a ring around the axis and a holder for holding a base end side of each abrasive bundle. In the polishing operation in which the polishing target surface 41 of the workpiece W having a convex curved surface is polished by the polishing brush 1, with respect to the normal vector 43 of the polishing target surface portion 42 with which the tip of the abrasive bundle 7 contacts the polishing target surface 41. The axis L of the polishing brush 1 is inclined.
[Selection] Figure 3

Description

  The present invention relates to a polishing method for a polishing brush for polishing a workpiece while rotating.

  A polishing brush for polishing the surface of a workpiece is disclosed in Patent Document 1. As shown in FIG. 4, the polishing brush 1 of the same document includes a plurality of abrasive bundles 7 arranged around a predetermined axis L in parallel and annularly, and a holder 21 that holds the base end side of each abrasive bundle. And a brush case 3 having a shank 2 connected to a machine tool. The holder 21 is held by the brush case 3, and the axis L coincides with the axis of the shank 2.

  The brush case 3 includes a holder 21 and a cylindrical portion 11 located on the outer peripheral side of the plurality of abrasive bundles 7. Each abrasive bundle 7 has a tip portion protruding forward from the cylindrical portion 11. Each of the plurality of abrasive bundles is composed of a plurality of linear abrasives collected in parallel. Each linear abrasive is obtained by solidifying an aggregate of inorganic long fibers with a resin.

JP 2003-136413 A

  Conventionally, in the polishing method of the polishing brush, as shown in FIG. 4, the tip of each abrasive bundle 7 is brought into contact with the surface 41 to be polished of the workpiece W while rotating the polishing brush 1 around the axis L. At this time, the normal vector 43 of the polishing target surface portion 42 in contact with each abrasive bundle 7 on the polishing target surface 41 and the axis L of the polishing brush 1 are made parallel.

  However, in such a polishing method, when the polishing target surface 41 of the workpiece W is a curved surface, a case where a desired grinding force (polishing force) cannot be obtained occurs.

  An object of the present invention is to propose a polishing method for a polishing brush capable of obtaining a desired grinding force when the surface to be polished of a workpiece is a curved surface.

  In the state where the desired grinding force (polishing force) cannot be obtained when the curved surface of the workpiece is ground by the conventional polishing method, the present inventors have applied each abrasive bundle by the centrifugal force that rotates the polishing brush. As a result, the tip end side of the blade was bent toward the outer peripheral side, and the tips of the abrasive bundles were not familiar with the surface to be polished. That is, as shown in FIG. 4, when the front end side of each abrasive bundle 7 is deflected to the outer peripheral side by centrifugal force, the front end surface 7 a of each abrasive bundle 7 becomes a normal vector 43 of the polishing target surface portion 42 of the workpiece W. It inclines with respect to the contact surface 45 which is perpendicular | vertical to and contacts the said grinding | polishing target surface part 42. As a result, the area (area) in contact with the workpiece on the tip surface of each abrasive bundle is reduced. That is, the familiarity of the hair tips of each abrasive bundle is reduced. Thereby, grinding force falls. The present invention is based on such knowledge.

In order to solve the above-described problems, the present invention provides a polishing brush having a plurality of abrasive bundles arranged in a ring around a predetermined axis, and a holder that holds the base end side of each abrasive bundle. In the polishing method of a polishing brush in which the tip of the abrasive bundle is brought into contact with the surface to be polished of a curved workpiece, the tip of the abrasive bundle is in contact with the surface to be polished. The axis line is inclined with respect to the normal vector of the target surface portion, and the tip surface of the abrasive bundle bent to the outer peripheral side by the centrifugal force of rotation is perpendicular to the normal vector of the polishing target surface portion. It is assumed that it is along a tangential surface that is in contact with the surface to be polished, and the inclination angle of the axis with respect to the normal vector is set in advance based on the rotational speed .

In the present invention, in the polishing operation, the axis of the rotating polishing brush is inclined with respect to the normal vector of the surface portion to be polished. Thereby, the front end surface of the abrasive bundle bent to the outer peripheral side by the centrifugal force can be made to be along the contact surface that is perpendicular to the normal vector of the surface portion to be polished and is in contact with the surface portion to be polished. As a result, when the tip of the abrasive bundle bent in the outer peripheral side by centrifugal force is brought into contact with the workpiece, the area (area) in contact with the workpiece on the tip surface of the abrasive bundle can be increased. it can. Accordingly, a decrease in grinding force can be suppressed, and a desired grinding force can be obtained. Here, the amount of bending of each abrasive bundle to the outer peripheral side due to centrifugal force increases and decreases as the rotational speed of the polishing brush increases and decreases. Therefore, if the inclination angle is set based on the rotational speed, the tip surface of the abrasive bundle bent to the outer peripheral side by the centrifugal force is converted into the normal vector of the surface portion to be polished.
It is easy to be along a contact surface perpendicular to the surface and in contact with the surface to be polished.

Next, the present invention provides a polishing brush having a plurality of abrasive bundles arranged in a ring around a predetermined axis and a holder for holding a base end side of each abrasive bundle around the axis. In the polishing method of a polishing brush in which the tip of the abrasive bundle is rotated and brought into contact with the polishing target surface of a workpiece having a curved surface, the normal line of the polishing target surface portion where the tip of the abrasive bundle contacts with the polishing target surface The axis line is inclined with respect to the vector, and the front end surface of the abrasive bundle bent to the outer peripheral side by the centrifugal force of rotation is in contact with the polishing target surface portion perpendicular to the normal vector of the polishing target surface portion. In this case, the inclination angle of the axis with respect to the normal vector is set in advance based on the flexibility of the fluff of each abrasive bundle.

In the present invention, in the polishing operation, the axis of the rotating polishing brush is inclined with respect to the normal vector of the surface portion to be polished. Thereby, the front end surface of the abrasive bundle bent to the outer peripheral side by the centrifugal force can be made to be along the contact surface that is perpendicular to the normal vector of the surface portion to be polished and is in contact with the surface portion to be polished. As a result, when the tip of the abrasive bundle bent in the outer peripheral side by centrifugal force is brought into contact with the workpiece, the area (area) in contact with the workpiece on the tip surface of the abrasive bundle can be increased. it can. Accordingly, a decrease in grinding force can be suppressed, and a desired grinding force can be obtained. Here, the amount of bending of each abrasive bundle that is bent by centrifugal force increases or decreases with the increase or decrease in the flexibility of the fur of each abrasive bundle. Therefore, if the inclination angle is set based on the flexibility of the bristles of each abrasive bundle, the tip surface of the abrasive bundle bent to the outer peripheral side by the centrifugal force is used as the normal vector of the surface portion to be polished. It is easy to be along a contact surface that is perpendicular to the surface and contacts the surface portion to be polished.

  Further, the present invention provides a plurality of abrasive bundles arranged in a ring around a predetermined axis, a holder for holding the proximal end side of each abrasive bundle, and the proximal end than the distal end of each abrasive bundle. A polishing brush that includes a plurality of abrasive material bundles that surround the plurality of abrasive material bundles from the outer peripheral side at a retracted position that is retracted toward the outer side, and abutting members that can contact the abrasive material bundles when the respective abrasive material bundles are bent toward the outer peripheral side. In the polishing method of a polishing brush in which the tip of the abrasive bundle is rotated around the axis, and the tip of the abrasive bundle is brought into contact with the surface to be polished of the curved surface, the abrasive is retracted to the base end side from the tip of each abrasive bundle. A plurality of the abrasive bundles are surrounded from the outer peripheral side at the retracted position, and provided with a contact member capable of contacting the abrasive bundle when each abrasive bundle is bent to the outer peripheral side, The axis is tilted and rotated with respect to the normal vector of the surface of the surface to be polished that contacts the tip of the abrasive bundle. The front end surface of the abrasive bundle bent to the outer peripheral side by centrifugal force is along a contact surface perpendicular to the normal vector of the surface portion to be polished and in contact with the surface portion to be polished. An inclination angle of the axis with respect to a line vector is set based on an abrasive bundle protruding dimension between the brush end surface and the retracted position in the axial direction.
It is characterized by.

In the present invention, in the polishing operation, the axis of the rotating polishing brush is inclined with respect to the normal vector of the surface portion to be polished. Thereby, the front end surface of the abrasive bundle bent to the outer peripheral side by the centrifugal force can be made to be along the contact surface that is perpendicular to the normal vector of the surface portion to be polished and is in contact with the surface portion to be polished. As a result, when the tip of the abrasive bundle bent in the outer peripheral side by centrifugal force is brought into contact with the workpiece, the area (area) in contact with the workpiece on the tip surface of the abrasive bundle can be increased. it can. Accordingly, a decrease in grinding force can be suppressed, and a desired grinding force can be obtained. Here, the amount of bending of each abrasive bundle that is bent by the centrifugal force increases or decreases with the increase or decrease of the protruding size of the abrasive bundle. Therefore, if the inclination angle is set based on the protruding size of the abrasive bundle, the tip surface of the abrasive bundle bent to the outer peripheral side by centrifugal force is perpendicular to the normal vector of the surface portion to be polished. It becomes easy to make it along the contact surface in contact with the target surface portion.

In the present invention, the abrasive bundle positioned on the other side is brought into contact with the workpiece, the abrasive bundle positioned on one side of the plurality of abrasive bundles sandwiched between the axes, with the axis being inclined. Can be separated from the workpiece. In this way, the abrasive bundle positioned on the other side of the axis among the plurality of abrasive bundles does not interfere with the workpiece, so that the inclination angle of the axis with respect to the normal vector of the surface to be polished can be easily controlled.

Here, the surface to be polished can be a convex curved surface.

In the present invention, each of the plurality of abrasive material bundles is composed of a plurality of linear abrasive materials gathered in parallel, and each linear abrasive material is preferably formed by consolidating an aggregate of inorganic long fibers with a resin. . If each abrasive bundle is composed of such a linear abrasive, it is easy to increase the grinding force of the polishing brush as compared to the case where the linear abrasive is nylon or wire brush containing abrasive. is there.

In the present invention, the angle of inclination of the axis with respect to the normal vector can be greater than 0 ° and 10 ° or less. If the inclination angle is in such an angle range, the tip surface of the abrasive bundle bent to the outer peripheral side by centrifugal force is perpendicular to the normal vector of the surface portion to be polished and is in contact with the surface portion to be polished. It is easy to be along.

  According to the present invention, a wide range of the front end surface of each abrasive bundle can be brought into contact with the surface to be polished in a state where the respective abrasive bundles are bent by the centrifugal force and the front end side spreads to the outer peripheral side. Accordingly, a decrease in grinding force can be suppressed, and a desired grinding force can be obtained.

1 is a side view of a polishing brush to which a polishing method of the present invention is applied. FIG. 2 is an exploded perspective view of the polishing brush of FIG. 1. It is explanatory drawing of the grinding | polishing method of this invention. It is explanatory drawing of the conventional grinding | polishing method using a grinding | polishing brush.

  Hereinafter, a polishing method for a polishing brush according to an embodiment of the present invention will be described with reference to the drawings.

(Abrasive brush)
FIG. 1 is a side view of a polishing brush to which the polishing method of the present invention is applied. FIG. 2 is an exploded perspective view of the brush for a polishing machine shown in FIG. The polishing brush 1 of this example is connected to a machine tool such as a machining center via a tool holder or the like, and polishes a surface to be polished of a curved work.

  As shown in FIGS. 1 and 2, the polishing brush 1 of this example includes a brush case 3 having a shank 2 serving as a connecting portion to a machine tool, a brush body 4 held by the brush case 3, and a brush body 4. Is provided with a pair of screws 5 and 6 for fixing the brush case 3 to the brush case 3. The brush body 4 includes a plurality of abrasive bundles 7, and the tips of the abrasive bundles 7 protrude from the brush case 3 to the opposite side of the shank 2. In the following description, the axis L direction of the shank 2 is defined as the front-rear direction X of the polishing brush 1, the side from which the abrasive bundle 7 protrudes is defined as the front X1, and the side where the shank 2 is located is defined as the rear X2.

  The brush case 3 includes a cylindrical portion 11 (contact member) and a circular end plate portion 12 that seals the rear end opening of the cylindrical portion 11. The shank 2 extends from the central portion of the end plate portion 12 toward the rear X2. Further, the support shaft 13 extends from the center portion of the end plate portion 12 toward the front X1. The support shaft 13 is located inside the cylindrical portion 11. The cylindrical portion 11, the support shaft 13, and the shank 2 are coaxial. The cylindrical portion 11 is provided with two groove-shaped guide holes 15 extending in the axis L direction. The two guide holes 15 are formed at point-symmetric positions with the axis L interposed therebetween. The brush case 3 has a cylindrical portion 11 made of aluminum. The support shaft 13 is made of stainless steel.

The brush body 4 includes a plurality of abrasive bundles 7 arranged around the axis L in parallel and in an annular shape, and a holder 21 that holds the rear end portion (base end side) of each abrasive bundle 7. Each abrasive bundle 7 is collected into a circle. The front end surface 7a (front end surface) of each abrasive bundle 7 is orthogonal to the axis L. Each of the plurality of abrasive bundles 7 includes a plurality of linear abrasives 22 gathered in parallel. Each linear abrasive 22 is formed by solidifying an inorganic long fiber aggregate yarn with a resin. In this example, each linear abrasive 22 is formed into a linear shape by impregnating and curing a binder resin such as an epoxy resin or a silicone resin in an aggregate yarn of alumina long fibers. The aggregate yarn is, for example, 250 alumina long fibers having a fiber diameter of 8 μm to 50 μm.
This is a collection of 3,000 to 3,000 books.

  As shown in FIG. 2, the holder 21 is annular and includes a shaft hole 24 into which the support shaft 13 can be inserted. The holder 21 includes a plurality of abrasive bundle holding holes 26 arranged in the circumferential direction at regular intervals on the annular front end surface. Each abrasive bundle holding hole 26 is circular. Each of the plurality of abrasive bundles 7 is collected into a circular shape by inserting the rear end portion into the abrasive bundle holding hole 26. Further, the rear end portion of each abrasive bundle 7 inserted into the abrasive bundle holding hole 26 is fixed to the holder 21 with an adhesive. The plurality of abrasive bundles 7 are separated from each other in the circumferential direction. The holder 21 also includes a pair of screw holes 27 that reach the shaft hole 24 from the annular outer peripheral surface. The pair of screw holes 27 are formed at point-symmetric positions with the axis L interposed therebetween.

  When the brush body 4 is held by the brush case 3, the support shaft 13 of the brush case 3 is inserted into the shaft hole 24 of the holder 21, and the holder 21 is inserted inside the cylindrical portion 11 of the brush case 3. Thereby, the holder 21 is fitted to the brush case 3 in a state in which the holder 21 can move in the direction of the axis L with respect to the cylindrical portion 11. Thereafter, the screws 5 and 6 are passed through the guide hole 15 from the outer peripheral side of the brush case 3 and screwed into the screw hole 27 of the holder 21. At this time, the holder 21 is fixed to the brush case 3 by tightening the screws 5 and 6 until the tips of the shaft portions of the screws 5 and 6 come into contact with the outer peripheral surface of the support shaft 13. Thereby, the brush body 4 is held by the brush case 3.

  Here, as shown in FIG. 1, the brush body 4 has the brush case 3 in a state in which the front end side of each linear abrasive 22 protrudes from the front end edge 11 a of the cylindrical portion 11 by a predetermined abrasive bundle protruding dimension M. Fixed to. When adjusting the protruding size M of the abrasive bundle, the screws 5 and 6 are held shallowly in the screw holes 27 of the holder 21 through the guide holes 15 of the brush case 3, and in this state, the brushes are placed inside the brush case 3. The main body 4 is moved in the front-rear direction X, and then the screws 5 and 6 are tightened. The adjustment of the abrasive bundle protruding dimension M is performed when the brush body 4 is mounted on the brush case 3 or when the abrasive bundle 7 is worn by a polishing operation for polishing a workpiece.

  In a state where the brush body 4 is held by the brush case 3, there is a slight gap between the plurality of abrasive material bundles 7 arranged in an annular shape and the cylindrical portion 11. The cylindrical portion 11 surrounds the plurality of abrasive bundles 7 from the outer peripheral side at a retracted position that is retracted further to the proximal end side than the distal end of the abrasive bundle 7. The cylindrical portion 11 can be brought into contact with the abrasive bundle 7 when each abrasive bundle 7 is deflected to the outer peripheral side, and regulates the amount of deflection of each abrasive bundle 7 toward the outer peripheral side. The brush tip surface 1a of the polishing brush 1 defined by the tip surfaces 7a of the plurality of abrasive bundles 7 when the polishing brush 1 is not rotating is orthogonal to the axis L.

(Polishing operation)

  In the polishing operation, the polishing brush 1 is rotated about the axis L, and the tip of the abrasive bundle 7 is brought into contact with the polishing target surface 41 of the workpiece W having a curved surface. In this example, as shown in FIG. 3, the axis L of the polishing brush 1 is inclined with respect to the normal vector 43 of the polishing target surface portion 42 with which the tip of the abrasive bundle 7 contacts the polishing target surface 41. In addition, the axis L is inclined so that the abrasive bundle 7 located on one side of the plurality of abrasive bundles 7 with the axis L interposed therebetween is brought into contact with the workpiece W, and the abrasive bundle 7 located on the other side is contacted. Separate from the workpiece W. In other words, in this example, the brush front end surface 1 a defined by the front end surfaces 7 a of the plurality of abrasive bundles 7 arranged in an annular shape when the polishing brush 1 is not rotating is perpendicular to the normal vector 43. A polishing operation is performed by intersecting with the contact surface 45 in contact with the polishing target surface portion 42.

The inclination angle θ of the axis L of the polishing brush 1 with respect to the normal vector 43 of the polishing target surface portion 42, that is, the inclination angle θ at which the brush tip surface 1 a is inclined with respect to the contact surface 45 of the polishing target surface portion 42 is determined by polishing operation. The angle is such that the tip surface 7a of the abrasive bundle 7 deflected to the outer peripheral side by the centrifugal force of the polishing brush 1 rotating along the contact surface 45 of the surface portion 42 to be polished. Inclination angle θ
Is preferably an angle at which the front end surface 7a of the abrasive bundle 7 bent toward the outer peripheral side and the contact surface 45 of the surface portion 42 to be polished are parallel or coincident.

The inclination angle θ is set in advance based on the following three elements.
(1) Rotational speed of polishing brush 1 during polishing operation (2) Flexibility of bristles of abrasive bundle 7 (3) Abrasive bundle protruding dimension M

Rotational speed of the polishing brush 1 during polishing operation is controlled in the range of 10000 min ^-1 from 500 min ^-1. The inclination angle θ is set according to the rotation speed. Here, when the rotational speed of the polishing brush 1 is high, the amount of bending of each abrasive bundle 7 due to the centrifugal force increases toward the outer peripheral side, so that the tip surface 7a of each abrasive bundle 7 is the brush tip surface 1a. It is greatly inclined to. Therefore, the inclination angle θ is set to be large so that the front end surface 7a of the abrasive bundle 7 bent toward the outer peripheral side is along the contact surface 45 of the surface portion 42 to be polished. On the other hand, when the rotational speed of the polishing brush 1 is low, the amount of bending of each abrasive bundle 7 to the outer peripheral side due to centrifugal force is small, so the tip surface 7a of each abrasive bundle 7 is relative to the brush tip surface 1a. The slope becomes smaller. Therefore, the tip angle 7a of the abrasive bundle 7 bent to the outer peripheral side is set along the contact surface 45 of the polishing target surface portion 42 by setting the inclination angle θ small.

  The flexibility of the bristles of the abrasive bundle 7 corresponds to the thickness of the linear abrasive 22 constituting each abrasive bundle 7 of the polishing brush 1. When the linear abrasive 22 is thin, the fluff becomes soft, the amount of bending of each abrasive bundle 7 to the outer peripheral side by centrifugal force increases, and the tip surface 7a of each abrasive bundle 7 is the brush tip surface. It is greatly inclined with respect to 1a. Therefore, the inclination angle θ is set to be large so that the tip surface 7a of the abrasive bundle 7 bent toward the outer peripheral side is along the contact surface 45 of the surface portion 42 to be polished. On the other hand, when the wire count is large, the linear abrasive 22 is thick and the fluff of the abrasive bundle 7 is hard. Therefore, the amount of bending of each abrasive bundle 7 toward the outer peripheral side due to centrifugal force is reduced, and the inclination of the tip surface 7a of each abrasive bundle 7 with respect to the brush tip surface 1a is reduced. Accordingly, the tip angle 7a of the abrasive bundle 7 bent toward the outer peripheral side is set along the contact surface 45 of the polishing target surface portion 42 by setting the inclination angle θ small.

  The abrasive bundle protruding dimension M is a distance from the front end of the cylindrical portion 11 of the brush case 3 in the direction of the axis L to the brush tip surface 1a. In this example, the abrasive bundle protruding dimension M is set in a range from 1 mm to 35 mm. Here, when the abrasive bundle protruding dimension M is large, the amount of bending of each abrasive bundle 7 to the outer peripheral side due to centrifugal force is large, so the tip surface 7a of each abrasive bundle 7 is the tip of the brush and the surface 1a. It is greatly inclined with respect to. Therefore, the tip angle 7a of the abrasive bundle 7 bent to the outer peripheral side is set along the contact surface 45 of the surface portion 42 to be polished by setting the inclination angle θ large. On the other hand, when the abrasive bundle protruding dimension M is small, the amount of bending of each abrasive bundle 7 to the outer peripheral side due to centrifugal force is reduced, so that the front end surface 7a of each abrasive bundle 7 with respect to the brush front end surface 1a. The slope is small. Therefore, the tip angle 7a of the abrasive bundle 7 bent to the outer peripheral side is set along the contact surface 45 of the polishing target surface portion 42 by setting the inclination angle θ small.

  In this example, the inclination angle θ of the axis L with respect to the normal vector 43 is based on the rotational speed of the polishing brush 1 during the polishing operation, the flexibility of the bristles of the abrasive bundle 7 and the protruding size M of the abrasive bundle. , Larger than 0 ° and not more than 10 °. If it is such a range, the front end surface 7a of the abrasive bundle 7 bent to the outer peripheral side can be made to follow the contact surface 45 of the surface portion 42 to be polished.

(Function and effect)
In this example, since the axis L of the rotating polishing brush 1 is inclined with respect to the normal vector 43 of the polishing target surface portion 42, the tip surface 7a of the abrasive bundle 7 deflected to the outer peripheral side by centrifugal force is applied. It can be along the contact surface 45 of the surface portion 42 to be polished. As a result, a region (area) in contact with the workpiece W on the tip surface 7a of the abrasive bundle 7 when the tip of the abrasive bundle 7 in a state of being bent to the outer peripheral side by centrifugal force is brought into contact with the workpiece W. Can be increased. Accordingly, it is possible to prevent or suppress the conformability of the hair tip of the polishing brush 1 and to suppress a decrease in grinding force. Therefore, a desired grinding force (polishing power) can be obtained.

  In this example, during the polishing operation, the abrasive bundle 7 located on one side of the plurality of abrasive bundles 7 with the axis L interposed therebetween is brought into contact with the workpiece W, and the abrasive bundle 7 located on the other side. Is separated from the workpiece W. Thereby, since the abrasive bundle 7 located on the other side of the axis L among the plurality of abrasive bundles 7 does not interfere with the workpiece W, the inclination angle θ of the axis L with respect to the normal vector 43 of the polishing target surface portion 42 is controlled. It's easy to do.

  Further, in this example, the linear abrasive 22 constituting the abrasive bundle 7 is formed by solidifying the aggregate yarn of inorganic long fibers with resin. Therefore, the grinding force of the polishing brush 1 is high.

  Further, in this example, the cylindrical portion 11 of the brush case 3 surrounds the plurality of abrasive bundles 7 from the outer peripheral side at the retracted position where the distal end surface 7a of each abrasive bundle 7 is retreated backward X2. When the material bundle 7 bends to the outer peripheral side, it can contact each abrasive material bundle 7. Therefore, the amount of bending of each abrasive bundle 7 that is bent to the outer peripheral side by centrifugal force can be regulated by the cylindrical portion 11. This makes it easy to grasp the inclination angle at which the front end surface 7a of the abrasive bundle 7 is inclined with respect to the brush front end surface 1a. Therefore, the inclination angle θ of the axis L with respect to the normal vector 43 of the surface portion 42 to be polished. Easy to set up.

(Modification)
In addition, you may grind | polish the grinding | polishing target surface 41 of the workpiece | work W which consists of a concave curved surface by the grinding | polishing operation | movement of this example. Also in this case, the axis L is inclined, and among the plurality of abrasive bundles 7, the abrasive bundle 7 positioned on one side with the axis L interposed therebetween is brought into contact with the workpiece W, and the abrasive positioned on the other side. The bundle 7 can be separated from the workpiece W.

  Moreover, as an inorganic long fiber which comprises the linear abrasive 22 of the abrasive bundle 7, a silicon carbide fiber, a boron fiber, etc. are employable.

DESCRIPTION OF SYMBOLS 1 ... Polishing brush, 1a ... Brush front end surface, 2 ... Shank, 3 ... Brush case, 4 ... Brush main body, 5, 6 ... Screw, 7 ... Abrasive material bundle, 7a ... Front end surface of abrasive material bundle, 11 ... Cylindrical part 11a: Front end edge of cylindrical portion, 12 ... End plate portion, 13 ... Support shaft, 15 ... Guide hole, 21 ... Holder, 22 ... Linear abrasive, 24 ... Shaft hole, 26 ... Abrasive bundle holding hole, 27 DESCRIPTION OF SYMBOLS ... Screw hole, 41 ... Surface to be polished, 42 ... Surface portion to be polished, 43 ... Normal vector, 45 ... Contact surface, X ... Front-back direction, X1 ... Front, X2 ... Back

Claims (7)

A polishing brush having a plurality of abrasive bundles arranged in a ring around a predetermined axis and a holder for holding a base end side of each abrasive bundle is rotated around the axis, and the abrasive is rotated. In the polishing method of the polishing brush in which the tip of the bundle is brought into contact with the surface to be polished of the curved workpiece,
The tip surface of the abrasive bundle that is deflected to the outer peripheral side by the centrifugal force of rotation is inclined with respect to the normal vector of the portion of the polishing target surface that contacts the tip of the abrasive bundle on the polishing target surface. , Along the tangential surface perpendicular to the normal vector of the surface portion to be polished and in contact with the surface portion to be polished;
A polishing method , wherein an inclination angle of the axis with respect to the normal vector is set in advance based on a rotation speed . A polishing brush having a plurality of abrasive bundles arranged in a ring around a predetermined axis and a holder for holding a base end side of each abrasive bundle is rotated around the axis, and the abrasive is rotated. In the polishing method of the polishing brush in which the tip of the bundle is brought into contact with the surface to be polished of the curved workpiece,
The tip surface of the abrasive bundle that is deflected to the outer peripheral side by the centrifugal force of rotation is inclined with respect to the normal vector of the portion of the polishing target surface that contacts the tip of the abrasive bundle on the polishing target surface. , Along the tangential surface perpendicular to the normal vector of the surface portion to be polished and in contact with the surface portion to be polished;
A polishing method , wherein an inclination angle of the axis with respect to the normal vector is set in advance based on the flexibility of the bristles of each abrasive bundle . A plurality of abrasive bundles arranged annularly in parallel around a predetermined axis, a holder for holding the proximal end side of each abrasive bundle, and a retracted position retracted to the proximal end side from the distal end of each abrasive bundle A polishing brush having a contact member that surrounds the plurality of abrasive bundles from the outer peripheral side and can contact the abrasive bundle when the respective abrasive bundles are bent toward the outer peripheral side. In the polishing method of the polishing brush that rotates and contacts the polishing target surface of the workpiece made of a curved surface with the tip of the abrasive bundle,
A plurality of the abrasive bundles are enclosed from the outer peripheral side at the retracted position retracted to the base end side from the distal end of each abrasive bundle, and contact with the abrasive bundle when each abrasive bundle is bent to the outer peripheral side. With a possible contact member,
The tip surface of the abrasive bundle that is deflected to the outer peripheral side by the centrifugal force of rotation is inclined with respect to the normal vector of the portion of the polishing target surface that contacts the tip of the abrasive bundle on the polishing target surface. , Along the tangential surface perpendicular to the normal vector of the surface portion to be polished and in contact with the surface portion to be polished;
A polishing method , wherein an inclination angle of the axis with respect to the normal vector is set in advance based on an abrasive bundle protruding dimension between the brush end surface and the retracted position in the axial direction . The abrasive bundle positioned on one side of the plurality of abrasive bundles sandwiched between the axes is brought into contact with the workpiece, and the abrasive bundle positioned on the other side is removed from the workpiece. The polishing method according to claim 1, wherein the polishing method is separated. The polishing method according to claim 1 , wherein the surface to be polished is a convex curved surface. Each of the plurality of abrasive bundles is composed of a plurality of linear abrasives gathered in parallel,
The polishing method according to any one of claims 1 to 5, wherein each linear abrasive is formed by solidifying aggregate yarns of inorganic long fibers with a resin. The polishing method according to claim 1, wherein an inclination angle of the axis with respect to the normal vector is set to be greater than 0 ° and equal to or less than 10 °.

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