Technical Field:
[0001] The present invention relates to a hand-held deburring machine suitable for polishing
the surface of a workpiece, particularly for removing burrs from the surface of a
drilled hole provided in a workpiece.
Background Art:
[0002] For example, when a workpiece is provided with intersecting drilled holes, burrs
are likely to occur at the edge of an opening where a drilled hole formed subsequently
intersects a drilled hole formed previously. As a device for removing such burrs,
there is known a device having a polishing brush formed by bundling a multiplicity
of polishing wires. The polishing brush is inserted into the relevant drilled hole
while being driven to rotate about the longitudinal axis of the polishing brush, thereby
removing the burrs (Patent Literatures 1 and 2).
Citation List:
Patent Literatures:
[0003]
Patent Literature 1: Japanese Utility Model Registration Application Publication No.
Hei 5-86455
Patent Literature 2: Japanese Patent Application Publication No. 2003-236738
Summary of Invention:
Technical Problem:
[0004] An object of the present invention is to provide a deburring machine using a polishing
brush formed by bundling a multiplicity of polishing wires as stated above, the deburring
machine being a hand-held deburring machine allowing a worker to perform a deburring
operation easily by holding the machine in his or her hand.
Solution to Problem:
[0005] The present invention provides a hand-held deburring machine having the following:
a body including a motor connected to a polishing brush having a plurality of polishing
wires extending rearward from a forward end to drive the polishing brush to rotate
about an axis extending in a longitudinal direction, the body being hand-holdable
by a worker; a cylindrical forward end member mounted to surround the periphery of
a forward end portion of the polishing wires; and a guide member secured to the cylindrical
forward end member to extend rearward and supported by the body so as to be displaceable
in the longitudinal direction, thereby allowing the cylindrical forward end member
to be displaceable rearward along the polishing brush. The polishing brush is pushed
out forward from the cylindrical forward end member and rotated to perform a deburring
operation by the polishing brush.
[0006] With this hand-held deburring machine, a worker holds the body in his or her hand
and brings the cylindrical forward end member into aligned contact with the opening
of a drilled hole provided in a workpiece, and then pushes the body toward the drilled
hole, thereby allowing the polishing brush to advance from the cylindrical forward
end member into the drilled hole. Accordingly, the polishing wires of the polishing
brush advanced into the drilled hole are opened radially outward by centrifugal force
by being driven to rotate by the motor, thereby polishing the inner surface of the
drilled hole and removing burrs from inside the drilled hole. Thus, the hand-held
deburring machine allows a worker to remove burrs from inside a drilled hole in a
workpiece easily by holding the machine in his or her hand. Further, because the periphery
of the forward end portion of the polishing wires is surrounded by the cylindrical
forward end member, there is no possibility of the polishing wires being undesirably
opened even if the polishing brush is driven to rotate in a state where the polishing
brush cannot be advanced forward from the cylindrical forward end member. Thus, safety
can be maintained.
[0007] Specifically, the arrangement may be as follows. The cylindrical forward end member
is engageable with the edge of the opening of a drilled hole provided in a workpiece
by being partially inserted into the opening of the drilled hole, thereby facilitating
alignment between the cylindrical forward end member and the drilled hole.
[0008] Further, the cylindrical forward end member may have an engaging portion engageable
with a surface of a workpiece that surrounds a drilled hole provided in the workpiece
when performing polishing of the inside of the drilled hole. With this arrangement,
the hand-held deburring machine can be supported even more stably during a polishing
operation.
[0009] Further, the body may have a pistol grip type grip portion that allows the body to
be gripped, with the polishing brush pointed forward. Thus, a worker can perform an
operation by gripping the pistol grip type grip portion; therefore, the worker can
work while looking at the drilled hole as a work target, and it is easy to move the
body forward and backward.
[0010] Further, the guide member may have a retraction stopper configured such that when
the guide member retracts by a predetermined distance, the retraction stopper engages
the body to stop retraction of the guide member. With this arrangement, the distance
by which the polishing brush is advanced can be limited according to the deburring
position in the drilled hole.
[0011] The hand-held deburring machine may further have an urging member urging the guide
member forward relative to the body so that the cylindrical forward end member is
positioned to surround the periphery of the forward end portion of the polishing wires.
This arrangement enables the hand-held deburring machine to return to the initial
state at all times when the polishing brush is pulled out from the drilled hole.
[0012] The hand-held deburring machine may further have a rotation stopper configured to
prevent rotation of the motor when the cylindrical forward end member is positioned
to surround the periphery of the forward end portion of the polishing wires. With
this arrangement, the motor is prevented from rotating when the polishing brush is
not advanced from the cylindrical forward end member into the drilled hole, and thus
safety can be improved.
[0013] The arrangement may be as follows. The motor is a pneumatic motor and has a rotating
shaft connected to the polishing brush in axial alignment therewith, and the rotation
stopper is configured to prevent rotation of the rotating shaft by engaging a rearward
portion of the rotating shaft extending rearward from the motor.
[0014] Specifically, the arrangement may be as follows. The rotation stopper is secured
to the guide member and configured to disengage from the rearward portion of the rotating
shaft when the guide member is moved rearward relative to the body. This arrangement
enables the polishing brush to be driven to rotate when the polishing brush is moved
forward from the cylindrical forward end member supported by the guide member.
[0015] The guide member may have a forward end support member supporting the cylindrical
forward end member, and at least two mutually spaced guide rods extending rearward
from the forward end support member in parallel to the plurality of polishing wires
and longitudinally slidably supported by the body.
[0016] With the above-described arrangement, the cylindrical forward end member can be supported
relative to the body in a three-point supporting manner. Thus, the cylindrical forward
end member can be stably moved in the longitudinal direction.
[0017] The arrangement may be as follows. The forward end support member is substantially
in the shape of a triangle having an apex defined by a portion of the forward end
support member that supports the cylindrical forward end member, and the guide rods
extend rearward from respective portions of the forward end support member that are
adjacent to the other apexes.
[0018] With the above-described arrangement in which the forward end support member has
a substantially triangular shape, when a drilled hole needing deburring is located
in a corner portion limited by the corner walls of a workpiece, the forward end support
member can be easily advanced into the corner portion.
[0019] Embodiments of a hand-held deburring machine according to the present invention will
be explained below on the basis of the accompanying drawings.
Brief Description of Drawings:
[0020]
Fig. 1 is a longitudinal vertical sectional view of a hand-held deburring machine
according to the present invention, in which a grip portion is illustrated in a schematic
view showing a basic structure thereof.
Fig. 2 is a vertical sectional view showing important parts of the hand-held deburring
machine in Fig. 1, showing the hand-held deburring machine when a polishing brush
is projected forward.
Fig. 3 is a drawing showing a cylindrical forward end member surrounding the periphery
of a forward end portion of the polishing brush of the hand-held deburring machine
in Fig. 1 and a forward end support member supporting the cylindrical forward end
member as seen from the front side.
Fig. 4 is a sectional view showing the cylindrical forward end member engaged in alignment
with a drilled hole provided in a workpiece when performing deburring of the inside
of the drilled hole by using the hand-held deburring machine shown in Fig. 1.
Fig. 5 is a sectional view showing a cylindrical forward end member suitable for performing
deburring when the junction of intersecting drilled holes is close to the surface
of a workpiece.
Fig. 6 is a sectional view showing a cylindrical forward end member suitable for use
when the distance from the surface of a workpiece to a drilled hole to be deburred
is long.
Fig. 7 is a sectional view of a cylindrical forward end member suitable for achieving
stable engagement with a workpiece.
Fig. 8 is a sectional view of a cylindrical forward end member suitable for removing
burrs from inside a drilled hole provided in a circular columnar workpiece.
Fig. 9 is a sectional view of a cylindrical forward end member suitable for achieving
stable engagement with a flat surface of a workpiece.
Fig. 10 is a sectional view of a cylindrical forward end member similar to Fig. 9,
the cylindrical forward end member having a short cylindrical portion to be inserted
into a drilled hole.
Description of Embodiments:
[0021] As shown in Fig. 1, a hand-held deburring machine 10 according to the present invention
has a polishing brush 12, a body 18 having a pistol grip type grip portion 18a hand-holdable
by a worker, a cylindrical forward end member 20 mounted to surround a forward end
portion of the polishing brush 12, and a guide member 22 secured to the cylindrical
forward end member 20 to extend rearward and supported by the body 18. The polishing
brush 12 is formed in an elongated circular columnar shape by bundling a multiplicity
of polishing wires 12a extending rearward from the forward end. The body 18 includes
a motor 14. The motor 14 is connected to the rear end of the polishing brush 12 to
drive the polishing brush 12 to rotate about an axis X extending in a longitudinal
direction. The guide member 22 is supported by the body 18 so as to be displaceable
in the longitudinal direction, and thus the cylindrical forward end member 20 secured
to the guide member 22 is displaceable rearward along the polishing brush 12, as shown
in Fig. 2,
[0022] In the illustrated example, the polishing brush 12 has a cylindrical bundling member
12b bundling the rear ends of a multiplicity of polishing wires 12a to form the polishing
wires 12a into a circular columnar shape as a whole, and a connecting rod 12c extending
rearward from the bundling member 12b. The rear end of the connecting rod 12c is inserted
into a cylindrical forward extending portion 14b of a rotating shaft 14a of the motor
14, thereby securing the polishing blush 12. As the polishing brush 12, it is possible
to use a ceramic fiber deburring brush available from XEBEC Technology Co., LTD.,
for example. The motor 14 is a turbine motor driven by compressed air introduced through
a compressed air inlet pipe 24 when the user gripping the grip portion 18a with one
hand squeezes a trigger 24a. The direction of compressed air to be supplied to the
motor 14 can be changed by switching flow paths in a valve member 24b by a knob (not
shown), thereby allowing switching between forward rotation and reverse rotation of
the motor 14. With this arrangement, burrs collapsed by rotation in one direction
can be easily removed by rotation in the opposite direction. The valve member 24b
functions also as a flow control valve for controlling the flow rate of compressed
air. By controlling the flow rate, it is possible to control the rotational speed
of the motor 14 and hence possible to control the polishing force applied by the polishing
brush 12.
[0023] The guide member 22 has a forward end support member 22a fixedly supporting the cylindrical
forward end member 20, and three mutually spaced guide rods 22b secured to the forward
end support member 22a to extend rearward and longitudinally slidably inserted through
respective support holes 18b in the body 18 (as will be stated below). As shown in
Fig. 3, the forward end support member 22a is substantially in the shape of a triangle
having an apex defined by a portion of the forward end support member 22a that supports
the cylindrical forward end member 20. Two guide rods 22b extend rearward from respective
portions of the forward end support member 22a that are adjacent to the other apexes,
and the other one of the guide rods 22b extends rearward from an intermediate position
between the two guide rods 22b. The guide rod 22b in the intermediate position has
a stopper 22c secured thereto in a position-adjustable manner. When the guide rod
22b is displaced rearward relative to the body 18 by a predetermined distance as shown
in Fig. 2, the stopper 22c engages the body 18 to stop the displacement (retraction)
of the guide rod 22b (and hence the cylindrical forward end member 20).
[0024] The three guide rods 22b extend further rearward beyond the body 18, and a motor
stopper 26 is secured to the rear ends of the guide rods 22b, the motor stopper 26
being axially aligned with the rotating shaft 14a of the motor 14. The motor stopper
26 has, as shown clearly in Fig. 2, a stopper support member 26a secured to the rear
ends of the guide rods 22b, a position adjusting screw 26b threadedly engaged with
the stopper support member 26a, and a stopper body 26d secured to the distal end of
the position adjusting screw 26b. The stopper body 26d is provided with a stopper
part 26c made of polyurethane or the like to receive the rear end of the rotating
shaft 14a of the motor 14 so as to prevent rotation of the rotating shaft 14a. When
the cylindrical forward end member 20 is positioned around the forward end of the
polishing brush 12 as shown in Fig. 1, the stopper part 26c receives the rear end
of the rotating shaft 14a to prevent rotation of the rotating shaft 14a. When the
guide member 22 moves rearward relative to the body 18 so that the cylindrical forward
end member 20 moves rearward relative to the forward end portion of the polishing
brush 12 to perform a deburring operation, the stopper part 26c separates from the
rear end of the rotating shaft 14a to allow rotation of the rotating shaft 14a. The
position adjusting screw 26b is configured to allow adjustment of the axial position
of the stopper body 26d by threadedly rotating the position adjusting screw 26b. Compression
coil springs 22d are provided around the two guide rods 22b located at the opposite
sides, respectively, of the guide rod 22b having the stopper 22c secured thereto so
that the compression coil springs 22d extend between the body 18 and the forward end
support member 22a. The compression coil springs 22d urge the forward end support
member 22a so that the cylindrical forward end member 20 is positioned around the
forward end of the polishing brush 12. It is preferable to mark a scale on the guide
rods 22b along the longitudinal direction thereof so as to enable the user to know
the amount of retraction of the guide member 22 relative to the polishing brush 12
(i.e. the distance by which the polishing brush 12 has advanced into the drilled hole),
although this is not illustrated in the figures.
[0025] When using the hand-held deburring machine 10, as shown in Fig. 4, a tapered surface
20a of the cylindrical forward end member 20 positioned at the forward end of the
polishing brush 12 is engaged with the opening edge of a drilled hole h in a workpiece
W to be deburred, thereby aligning the cylindrical forward end member 20 with the
drilled hole h. In this state, the polishing brush 12 is driven to rotate, and while
doing so, the body 18 is advanced toward the workpiece W. Consequently, the polishing
brush 12 advances into the drilled hole h, and the polishing wires 12a are opened
radially outward by centrifugal force, thereby polishing the inner peripheral surface
of the drilled hole h, and thus removing burrs from the inner peripheral surface of
the drilled hole h. As shown in the figure, if a drilled hole h1 is subsequently formed
so as to intersect the drilled hole h, burrs may be formed to extend into the drilled
hole h along the intersecting edges of these holes. Such burrs can be removed by polishing
the inner peripheral surface of the drilled hole h as stated above. When the polishing
wires 12a have shortened as a result of use, the cylindrical forward end member 20
is positioned forward of the forward end of the polishing wires 12a. In such a case,
the position adjusting screw 26b is rotated to adjust the position thereof rearward
relative to the guide rods 22b so that the cylindrical forward end member 20 is positioned
around the forward end of the polishing wires 12a when the stopper part 26c of the
motor stopper 26 reaches a position to receive the rear end of the rotating shaft
14a so as to prevent rotation of the rotating shaft 14a. The cylindrical forward end
member 20 is replaceable relative to the forward end support member 22a according
to the bore diameter of the drilled hole h. Similarly, the polishing brush 12 is replaceable
relative to the cylindrical forward extending portion 14b.
[0026] Fig. 5 shows a modification of the cylindrical forward end member 20 which is suitable
for removing burrs from the junction of intersecting drilled holes h and h1 when the
drilled hole h1 is near the surface of the workpiece. That is, the cylindrical forward
end member 20 of the modification is configured such that the forward portion of a
bore 20b receiving the polishing brush 12 gradually increases in radius toward the
front side, thereby making it easy for the polishing wires 12a to open radially immediately
after entering the drilled hole h. The cylindrical forward end member 20 is not provided
with a tapered surface 20a such as that of the cylindrical forward end member 20 shown
in Fig. 4.
[0027] Fig. 6 shows an example of the cylindrical forward end member 20 suitable for use
when a hole h2 having a large diameter is provided at a side of a drilled hole h to
be deburred that is closer to the surface of the workpiece W. The cylindrical forward
end member 20 is elongated in order to allow the tapered surface 20a of the cylindrical
forward end member 20 to engage the opening edge of the drilled hole h located at
an inner position.
[0028] Fig. 7 shows an example in which the cylindrical forward end member 20 is provided
with a cylindrical portion 20c extending forward from the tapered surface 20a so as
to allow the cylindrical forward end member 20 to be engaged with the drilled hole
h even more stably.
[0029] Fig. 8 shows a modification of the cylindrical forward end member 20 suitable for
use when the workpiece W has a circular columnar shape and a hole h3 longitudinally
extending through the center of the workpiece W is formed so as to intersect a drilled
hole h extending diametrically of the workpiece W. The cylindrical forward end member
20 has a forward end surface 20d which is an inwardly curved surface having a curvature
corresponding to that of the outer surface of the circular columnar workpiece W.
[0030] Fig. 9 shows an example in which an annular flange 20e is provided in place of the
tapered surface 20a so as to allow the cylindrical forward end member 20 to be stably
engaged with the workpiece W. Fig. 10 shows a cylindrical forward end member 20 provided
with a short cylindrical portion 20f configured to enter the drilled hole h, in addition
to a flange 20e similar to the above. The cylindrical portion 20f makes it easy for
the cylindrical forward end member 20 to align with the drilled hole h, and the flange
20e allows the cylindrical forward end member 20 to be stabilized even more during
an operation.
[0031] Although some embodiments of the hand-held deburring machine according to the present
invention have been described above, the present invention is not limited to the described
embodiments. For example, the forward end support member 22a shown in Fig. 3 has a
substantially triangular shape. The reason for this is that when a drilled hole h
needing deburring is located in a corner portion limited by the corner walls of a
workpiece W, the substantially triangular shape enables the forward end support member
22a to be easily advanced into the corner portion. Therefore, the forward end support
member 22a may have a desired shape other than triangular shape. The motor is not
limited to the pneumatic motor but may be an electric motor. Further, the hand-held
deburring machine according to the present invention is suitable for removing burrs
from inside a drilled hole but also usable to polish the surface of a drilled hole.
Reference Signs List:
[0032]
Drilled hole h;
workpiece W;
axis X;
hand-held deburring machine 10;
polishing brush 12;
polishing wires 12a;
cylindrical bundling member 12b;
connecting rod 12c;
motor 14;
rotating shaft 14a;
cylindrical forward extending portion 14b;
body 18;
grip portion 18a;
support holes 18b;
cylindrical forward end member 20;
tapered surface 20a;
bore 20b;
cylindrical portion 20c;
forward end surface 20d;
flange 20e;
cylindrical portion 20f;
guide member 22;
forward end support member 22a;
guide rods 22b;
stopper 22c (retraction stopper);
compression coil springs 22d (urging member);
compressed air inlet pipe 24;
trigger 24a;
valve member 24b;
motor stopper 26 (rotation stopper);
stopper support member 26a;
position adjusting screw 26b;
stopper part 26c;
stopper body 26d.
1. A hand-held deburring machine comprising:
a body including a motor connected to a polishing brush having a plurality of polishing
wires extending rearward from a forward end to drive the polishing brush to rotate
about an axis extending in a longitudinal direction, the body being hand-holdable
by a worker;
a cylindrical forward end member mounted to surround a periphery of a forward end
portion of the polishing wires; and
a guide member secured to the cylindrical forward end member to extend rearward and
supported by the body so as to be displaceable in the longitudinal direction, thereby
allowing the cylindrical forward end member to be displaceable rearward along the
polishing brush;
wherein the polishing brush is pushed out forward from the cylindrical forward end
member and rotated to perform a deburring operation by the polishing brush.
2. The hand-held deburring machine of claim 1, wherein the cylindrical forward end member
is engageable with an edge of an opening of a drilled hole provided in a workpiece
by being partially inserted into the opening of the drilled hole.
3. The hand-held deburring machine of claim 1 or 2, wherein the cylindrical forward end
member has an engaging portion engageable with a surface of a workpiece that surrounds
a drilled hole provided in the workpiece when performing polishing of inside of the
drilled hole.
4. The hand-held deburring machine of any one of claims 1 to 3, wherein the body has
a pistol grip type grip portion that allows the body to be gripped, with the polishing
brush pointed forward.
5. The hand-held deburring machine of any one of claims 1 to 4, wherein the guide member
has a retraction stopper configured such that when the guide member retracts, the
retraction stopper engages the body to stop retraction of the guide member.
6. The hand-held deburring machine of any one of claims 1 to 5, further comprising: an
urging member urging the guide member forward relative to the body so that the cylindrical
forward end member is positioned to surround the periphery of the forward end portion
of the polishing wires.
7. The hand-held deburring machine of any one of claims 1 to 6, further comprising: a
rotation stopper configured to prevent rotation of the motor when the cylindrical
forward end member is positioned to surround the periphery of the forward end portion
of the polishing wires.
8. The hand-held deburring machine of claim 7, wherein the motor is a pneumatic motor
and has a rotating shaft connected to the polishing brush in axial alignment therewith,
the rotation stopper being configured to prevent rotation of the rotating shaft by
engaging a rearward portion of the rotating shaft extending rearward from the motor.
9. The hand-held deburring machine of claim 8, wherein the rotation stopper is secured
to the guide member, the rotation stopper being configured to disengage from the rearward
portion of the rotating shaft when the guide member is moved rearward relative to
the body.
10. The hand-held deburring machine of any one of claims 1 to 9, wherein the guide member
has a forward end support member supporting the cylindrical forward end member, and
at least two mutually spaced guide rods extending rearward from the forward end support
member in parallel to the plurality of polishing wires and longitudinally slidably
supported by the body.
11. The hand-held deburring machine of claim 10, wherein the forward end support member
is substantially in a shape of a triangle having an apex defined by a portion of the
forward end support member that supports the cylindrical forward end member, the guide
rods extending rearward from respective portions of the forward end support member
that are adjacent to the other apexes.