U.S. patent application number 15/521266 was filed with the patent office on 2018-10-25 for polishing brush.
The applicant listed for this patent is TAIMEI CHEMICALS CO., LTD., XEBEC TECHNOLOGY CO., LTD.. Invention is credited to Suguru MATSUSHITA, Norihiko SUMIYOSHI.
Application Number | 20180304444 15/521266 |
Document ID | / |
Family ID | 55856741 |
Filed Date | 2018-10-25 |
United States Patent
Application |
20180304444 |
Kind Code |
A1 |
MATSUSHITA; Suguru ; et
al. |
October 25, 2018 |
POLISHING BRUSH
Abstract
A polishing brush (1) includes grinding element bundles (22)
each including wire-shaped grinding elements (21) formed of an
assembly of inorganic filaments impregnated and solidified with
resin, and a grinding element holder (23) that holds the grinding
element bundles (22). The grinding element holder (23) has an
annular grinding element holding groove (28), and an adhesive (29)
is filled in the grinding element holding groove (28). Respective
base end portions (22a) of the grinding element bundles (22) are
inserted in the grinding element holding groove (28) in such a
state as to be kept apart from each other and are fixed to the
grinding element holder (23) with the adhesive (29). Even when the
diameter size or the like of each grinding element bundle (22) is
larger than the width of the groove, the grinding element bundles
(22) are deformed to conform to the groove, thereby being inserted
into the groove.
Inventors: |
MATSUSHITA; Suguru; (Nagano,
JP) ; SUMIYOSHI; Norihiko; (Tokyo, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
TAIMEI CHEMICALS CO., LTD.
XEBEC TECHNOLOGY CO., LTD. |
Nagano
Tokyo |
|
JP
JP |
|
|
Family ID: |
55856741 |
Appl. No.: |
15/521266 |
Filed: |
October 27, 2014 |
PCT Filed: |
October 27, 2014 |
PCT NO: |
PCT/JP2014/078531 |
371 Date: |
April 21, 2017 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B24D 3/28 20130101; B24D
13/145 20130101 |
International
Class: |
B24D 13/14 20060101
B24D013/14 |
Claims
1. A polishing brush comprising: a plurality of wire-shaped
grinding elements; and a grinding element holder holding the
wire-shaped grinding elements, wherein the grinding element holder
has a groove, and first end portions of the wire-shaped grinding
elements are inserted in the groove and fixed to the grinding
element holder with an adhesive filling the groove.
2. The polishing brush according to claim 1, wherein the
wire-shaped grinding elements are subdivided to form a plurality of
grinding element bundles, and the grinding element bundles are
fixed to the grinding element holder in such a state as to be kept
apart from each other.
3. The polishing brush according to claim 2, wherein the groove is
an annular groove formed around the axis of center of rotation, and
the grinding element bundles are inserted at regular intervals in
the annular groove.
4. The polishing brush according to claim 2, wherein each of the
grinding element bundles has a circular shape in cross section in a
direction orthogonal to a length direction of each of the
wire-shaped grinding elements at an end portion of the grinding
element bundle inserted in the groove.
5. The polishing brush according to claim 1, wherein each of the
wire-shaped grinding elements is formed of an assembly of inorganic
filaments impregnated and solidified with resin.
Description
FIELD
[0001] The present invention relates to a polishing brush having a
grinding element holder holding a plurality of wire-shaped grinding
elements.
BACKGROUND
[0002] Such a polishing brush is described in Patent Literature 1.
In this literature, a plurality of wire-shaped grinding elements
are subdivided to form a plurality of grinding element bundles, and
the grinding element bundles are held apart from each other in a
grinding element holder. Each grinding element bundle has a
circular shape in cross section, and the grinding element holder
has a plurality of holding holes for holding the grinding element
bundles. The holding holes are circular and disposed apart from
each other. The grinding element bundles have respective base end
portions inserted in the holding holes and fixed to the grinding
element holder with an adhesive filling the holding holes.
CITATION LIST
Patent Literature
[0003] Patent Literature 1: WO2004/009239
SUMMARY
Technical Problem
[0004] In a polishing brush having a grinding element bundle held
in a holding hole with a shape adapted to the cross-sectional shape
of the bundle, if the diameter size of the grinding element bundle
is larger than the inner diameter size of the holding hole or the
shape of the grinding element bundle differs from the shape of the
holding hole at the time of manufacturing, the grinding element
bundle fails to be inserted in the holding hole. Therefore, at the
time of manufacturing of the polishing brush, it is necessary to
strictly control the diameter dimension and shape of the grinding
element bundle of wire-shaped grinding elements within a
predetermined range corresponding to the inner diameter size and
shape of the holding hole provided in the grinding element
holder.
[0005] In this respect, an object of the present invention is to
provide a polishing brush in which a plurality of wire-shaped
grinding elements can be readily held in the grinding element
holder.
Solution to Problem
[0006] In order to solve the problem above, the present invention
provides a polishing brush including a plurality of wire-shaped
grinding elements and a grinding element holder holding the
wire-shaped grinding elements, characterized in that the grinding
element holder has a groove, and that first end portions of the
wire-shaped grinding elements are inserted in the groove and fixed
to the grinding element holder with an adhesive filling the
groove.
[0007] According to the present invention, since the wire-shaped
grinding elements are inserted in the groove and fixed with an
adhesive, it is possible to hold the wire-shaped grinding elements
in the grinding element holder without strictly controlling the
shape of the wire-shaped grinding elements.
[0008] In the present invention, the wire-shaped grinding elements
may be subdivided to form a plurality of grinding element bundles,
and the grinding element bundles may be fixed to the grinding
element holder in such a state as to be kept apart from each other.
With this configuration, even when the diameter size or shape of
each grinding element bundle is larger than the width of the
groove, the grinding element bundle is deformed to conform to the
groove whereby the base end portion of the grinding element bundle
can be inserted in the groove. Thus, even when each grinding
element bundle has a different diameter size or shape, the grinding
element bundles can be held in the grinding element holder.
Furthermore, in this configuration, the grinding element bundles
held in the grinding element holder are kept apart from each other
to allow chips to be efficiently ejected during grinding work. In
addition, since the grinding element bundles held in the grinding
element holder are kept apart from each other, the heat dissipation
effect is high. Moreover, when compared with a case in which the
wire-shaped grinding elements are held without a gap, the polishing
brush can be formed with a smaller amount of grinding elements.
[0009] In the present invention, the groove may be an annular
groove formed around the axis of center of rotation, and the
grinding element bundles may be inserted at regular intervals in
the annular groove. With this configuration, a cup-shaped polishing
brush or a wheel brush can be readily manufactured.
[0010] In the present invention, each of the grinding element
bundles may have a circular shape in cross section in a direction
orthogonal to a length direction of each of the wire-shaped
grinding elements at an end portion of the grinding element bundle
inserted in the groove. This configuration enables the grinding
element bundle to be held in the grinding element holder without
strictly controlling the diameter size of the grinding element
bundle.
[0011] In the present invention, each of the wire-shaped grinding
elements may be formed of an assembly of inorganic filaments
impregnated and solidified with resin. Since the wire-shaped
grinding element formed of inorganic filaments has high hardness,
the grinding/polishing capability of the polishing brush is
improved even with a small amount of grinding elements.
BRIEF DESCRIPTION OF DRAWINGS
[0012] FIG. 1 is a perspective view of a polishing brush in a first
embodiment.
[0013] FIG. 2 is an exploded perspective view of the polishing
brush.
[0014] FIG. 3 is an illustration of the polishing brush and the
polishing brush body.
[0015] FIG. 4 is an illustration of a polishing brush in a second
embodiment.
DESCRIPTION OF EMBODIMENTS
[0016] A polishing brush to which the present invention is applied
will be described below with reference to the drawings. In the
following description, it is assumed that the direction of the axis
of center of rotation of the polishing brush is the top-bottom
direction of the polishing brush in accordance with to the
top-bottom direction in FIG. 1, for the sake of convenience.
First Embodiment
[0017] FIG. 1 is an illustration of a polishing brush to which the
present invention is applied. FIG. 2 is an exploded perspective
view showing the polishing brush shown in FIG. 1 disassembled into
a brush case and a polishing brush body. FIG. 3(a) is a
cross-sectional view of the polishing brush cut through a portion
fixed with screws, FIG. 3(b) is a bottom view of the polishing
brush, and FIG. 3(c) is a longitudinal sectional view of the
polishing brush body.
[0018] As shown in FIG. 1, the polishing brush 1 in this embodiment
includes a cup-shaped brush case 6 having a shank 5 coupled to the
head of a machine tool (grinder), a polishing brush body 7 having
an upper side portion inserted in the brush case 6, and screws 8
and 9 for fixing the polishing brush body 7 to a predetermined
position in the brush case 6.
[0019] The brush case 6 is made of metal and includes a
cylinder-shaped peripheral wall 11 and a circular top plate 12
closing the upper end opening of the peripheral wall 11. The shank
5 extends upward from the central portion of the top plate 12. A
rod-shaped support shaft 13 extends downward from the central
portion of the lower surface of the top 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 has guide holes 14 and 15
extending in the shape of a groove parallel to the axis of center
of rotation L. The guide holes 14 and 15 are formed in point
symmetry with the axis of center of rotation L interposed
therebetween. In this embodiment, the peripheral wall 11 of the
brush case 6 is made of aluminum, and the support shaft 13 is made
of stainless steel.
[0020] As shown in FIG. 2, the polishing brush body 7 includes a
plurality of grinding element bundles 22, each formed of a
plurality of wire-shaped grinding elements 21, and an annular
grinding element holder 23 holding the grinding element bundles 22.
The grinding element holder 23 is made of metal. The grinding
element holder 23 has a center hole 24, which is a shaft hole
allowing the support shaft 13 to pass through. The grinding element
holder 23 has a pair of screw holes 25 and 26 at point-symmetric
positions with the axis of center of rotation L interposed
therebetween. As shown in FIG. 3(a), the screw holes 25 and 26 pass
through the grinding element holder 23 in the radius direction.
[0021] As shown in FIG. 3(b) and FIG. 3(c), the grinding element
holder 23 has an annular grinding element holding groove (groove)
28 formed around the axis of center of rotation L on its lower end
surface, namely, a grinding member holding surface 27. The grinding
element bundles 22 have respective base end portions 22a inserted
in the grinding element holding groove 28 in such a state as to be
kept apart from each other and are fixed to the grinding element
holder 23 with an adhesive 29 filling the grinding element holding
groove 28. The adhesive 29 is, for example, of a silicone resin
type or an epoxy resin type. As shown in FIG. 3(b), in the first
embodiment, each grinding element bundle 22 is a bundle shaped in a
circle. More specifically, each grinding element bundle 22 has a
circular shape in cross section in a direction orthogonal to the
length direction of each wire-shaped grinding element 21 at an end
portion of the grinding element bundle 22 inserted in the grinding
element holding groove 28. The grinding element bundles 22 are
inserted and fixed at regular intervals in the grinding element
holding groove 28. In a state in which the grinding element bundles
22 are fixed to the grinding element holder 23, the grinding
element bundles 22 extend downward from the grinding member holding
surface 27 of the grinding element holder 23.
[0022] Each wire-shaped grinding element 21 is formed of an
assembly of alumina filaments as inorganic filaments impregnated
and hardened with a thermosetting binder resin such as silicone
resin, phenol resin, epoxy resin, polyimide resin, polymaleimide
resin, unsaturated polyester resin, and urethane resin. A
thermoplastic resin such as nylon may be used as the binder resin.
In the first embodiment, the filament assembly is a group of 250 to
3000 alumina filaments having a fiber diameter of 8 to 50 .mu.m.
The diameter of the filament assembly is 0.1 mm to 2 mm. The
filament assembly may be twisted.
[0023] Here, when the base end portion 22a of each grinding element
bundle 22 is inserted into the grinding element holding groove 28,
the subdivided wire-shaped grinding elements 21 are simply put
together and bundled. The wire-shaped grinding elements 21
subdivided and bundled are tied together with the adhesive 29 in
the form of the grinding element bundle 22 when being fixed to the
grinding element holder 23 with the adhesive 29 in the grinding
element holding groove 28.
[0024] To build the polishing brush 1 with 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 grinding element
holder 23, and the upper portion of the polishing brush body 7 (the
side of the grinding element holder 23) is inserted in the inside
of the brush case 6. Then, the screws 8 and 9 are put through the
guide holes 14 and 15 from the outer peripheral side of the brush
case 6, and the screws 8 and 9 are secured to the screw holes 25
and 26 of the grinding element holder 23. In doing so, the screws 8
and 9 are tightened until the tip ends of the shafts of the screws
8 and 9 abut on the outer peripheral surface of the support shaft
13. The grinding element holder 23 is thus fixed to the support
shaft 13 of the brush case 6 through the screws 8 and 9. In the
outer peripheral surface of the support shaft 13, the region and
the vicinity thereof in abutment with the tip ends of the screws 8
and 9 are flat surfaces.
[0025] (Work Operation)
[0026] In a case where burring or grinding/polishing work on a
surface is to be performed on a work using the polishing brush 1,
the shank 5 is coupled to the head of a machine tool and rotated
around the axis of center of rotation L, and the free ends (lower
ends) of the grinding element bundles 22 are pressed against the
surface of the work. When the wire-shaped grinding elements 21
included in the grinding element bundle 22 are worn due to the work
operation and the length of the protrusion from the lower edge 6a
of the brush case 6 is reduced, the screws 8 and 9 secured to the
grinding element holder 23 through the guide holes 14 and 15 are
loosened. Then, the polishing brush body 7 is moved in the
direction of the axis of center of rotation L in the inside of the
brush case 6, and thereafter the screws 8 and 9 are tightened. With
this operation, the position in the direction of the axis of center
of rotation L of the polishing brush body 7 in the inside of the
brush case 6 is adjusted, so that the length of the protrusion of
the free end of the wire-shaped grinding element 21 from the brush
case 6 is adjusted.
[0027] (Operation and Effects)
[0028] According to the first embodiment, the grinding element
bundles 22 are inserted in the grinding element holding groove 28
provided to the grinding element holder 23 and fixed with the
adhesive 29 filling the grinding element holding groove 28, rather
than being inserted in holding holes adapted to the cross-sectional
shape of each bundle 22. Therefore, even when the diameter size or
the like of each grinding element bundle 22 is larger than the
width of the grinding element holding groove 28, the grinding
element bundle 22 is deformed to conform to the grinding element
holding groove 28, whereby the base end portion 22a of the grinding
element bundle 22 can be inserted into the grinding element holding
groove 28. Thus, even when each grinding element bundle 22 of the
wire-shaped grinding elements 21 has a different diameter size, the
grinding element bundles 22 can be held in the grinding element
holder 23.
[0029] Furthermore, in the first embodiment, the grinding element
bundles 22 held in the grinding element holder 23 are kept apart
from each other to allow chips to be ejected efficiently during
grinding work. In addition, since the grinding element bundles 22
held in the grinding element holder 23 are kept apart from each
other, the heat dissipation effect is high. Moreover, when compared
with a case in which the wire-shaped grinding elements 21 are held
without a gap in the grinding element holding groove 28, the
polishing brush 1 can be formed with a smaller amount of grinding
elements.
[0030] In the first embodiment, each wire-shaped grinding element
21 is formed of an assembly of inorganic filaments impregnated and
solidified with resin and has high hardness, thereby providing the
polishing brush 1 with a high grinding/polishing capability even
when the grinding element bundles 22 are held apart from each other
in the grinding element holder 23.
Second Embodiment
[0031] FIG. 4(a) is an illustration of a polishing brush in a
second embodiment to which the present invention is applied, and
FIG. 4(b) is a perspective view of the grinding element holder for
the polishing brush in the second embodiment. It is noted that the
polishing brush 51 in the second embodiment has a configuration
corresponding to the polishing brush 1 in the first embodiment, and
the corresponding parts are denoted with the same reference signs
and will not be further elaborated.
[0032] As shown in FIG. 4(a), the polishing brush 51 includes a
shank member 52 having a shank 5 coupled to the head of a machine
tool (drive device), an annular grinding element holder 23 through
which the lower side portion of the shank member 52 passes, and a
locknut 53 screwed onto the lower end portion of the shank member
52. The outer peripheral side surface of the grinding element
holder 23 serves as a grinding member holding surface 27, and a
plurality of grinding element bundles 22 protrude radially outward
from the grinding member holding surface 27. The grinding element
holder 23 and the grinding element bundles 22 constitute the
polishing brush body 7.
[0033] The shank member 52 has the shank 5, a collar 54, and a bolt
55 from the top to the bottom. The outer peripheral surface of the
bolt 55 has a male thread screwed into the locknut 53. A portion of
the shank member 52 that is lower than the collar 54 is inserted in
the center hole 24 of the grinding element holder 23 (see FIG.
4(b)), and the lower end portion of the bolt 55 protrudes downward
from the grinding element holder 23.
[0034] The grinding element holder 23 has an annular grinding
element holding groove (groove) 28 formed on its grinding member
holding surface 27 around the axis of center of rotation L. The
grinding element bundles 22 have respective base end portions 22a
inserted in the grinding element holding groove 28 in such a state
as to be kept apart from each other and are fixed to the grinding
element holder 23 with an adhesive 29 filling the grinding element
holding groove 28. In the second embodiment, the grinding element
bundles 22 are inserted and fixed at regular intervals in the
grinding element holding groove 28. Each grinding element bundle 22
is made from the wire-shaped grinding elements 21 formed of an
assembly of inorganic filaments impregnated and solidified with
resin. Each grinding element bundle 22 is a bundle shaped in a
circle.
[0035] The locknut 53 is screwed from below onto the lower end
portion of the bolt 55 protruding downward from the grinding
element holder 23. The locknut 53 is screwed onto the bolt 55 until
the grinding element holder 23 becomes sandwiched between the
collar 54 and the locknut 53 of the shank member 52, whereby the
grinding element holder 23 is fixed to the shank member 52.
[0036] When burring or grinding/polishing work on a surface is
performed on a work using the polishing brush 51, the shank 5 is
coupled to the head of a machine tool and rotated around the axis
of center of rotation L, and the free ends (the ends on the outer
peripheral side) of the grinding element bundles 22 are pressed
against the surface of the work. When the wire-shaped grinding
elements 21 included in the grinding element bundle 22 are worn due
to the work operation, the locknut 53 is loosened and removed from
the shank member 52, and the grinding element holder 23 is then
removed from the shank member 52 for replacement of the polishing
brush body 7 alone with a new one.
[0037] The second embodiment can achieve the same operation and
effects as in the first embodiment.
Other Embodiments
[0038] In each embodiment, a plurality of grinding element holding
grooves 28 may be provided in the grinding element holder 23. The
grinding element holding groove 28 may be provided linearly on the
grinding member holding surface 27.
[0039] Although the wire-shaped grinding elements 21 are bundled
into a circular shape in the foregoing examples, the wire-shaped
grinding elements 21 may be bundled into other shapes. For example,
the wire-shaped grinding elements 21 may be bundled such that the
cross-sectional shape of the base end portion 22a inserted as a
grinding element bundle 22 in the grinding element holding groove
28 is oval, rectangular, or square.
[0040] In the foregoing examples, the wire-shaped grinding elements
21 are subdivided to form the grinding element bundles 22, and the
grinding element bundles 22 are fixed to the grinding element
holder 23 so as to be kept apart from each other. Alternatively,
the wire-shaped grinding elements 21 may not be subdivided but may
be arranged in an annular shape such that a first end portion of
each wire-shaped grinding element 21 is inserted in the grinding
element holding groove 28 to be fixed to the grinding element
holder 23. Also in this case, it is possible to hold the
wire-shaped grinding elements 21 in the grinding element holder 23
without strictly controlling the shape (the shape of arrangement of
the wire-shaped grinding elements 21) of the wire-shaped grinding
elements 21 to be held in the grinding element holder 23.
[0041] The wire-shaped grinding element 21 used may be formed of an
assembly of silicon carbide fibers, carbon fibers, silicon nitride
fibers, glass fibers, and the like impregnated and solidified with
resin. Alternatively, the wire-shaped grinding element 21 used may
be formed of nylon, abrasive-containing nylon, abrasive-containing
rubber, stainless steel, brass, and the like. The grinding element
bundle 22 may have a quadrangular shape in cross section.
* * * * *