JP2023023093A - brush unit - Google Patents

Abstract

To provide a brush unit which can automatically adjust an axial position of a brush according to the amount of wear of a wire rod.SOLUTION: A brush unit 100 includes: a shank 1; a cylinder chamber 4 which is open in a tip direction and extends along the shank 1; a cylinder 3 having a guide hole 5 extending in parallel with a shaft 2, and an escape part 25 extending radially outwardly from the guide hole 5; a piston 11 which reciprocates in the cylinder chamber 4, is open in the tip direction, and has a brush holding hole 9 extending in parallel with the shaft 2, and a supporting body holding hole 7 penetrating the piston 11 in a radial direction; a brush 17 inserted into the brush holding hole 9 and having a brush body 19 with a recess 15, and a wire rod 21; a first elastic body 13 for pushing out the piston 11 in the tip direction; and a supporting body 23 which is supported in the supporting body holding hole 7, moves between the guide hole 5 and the recess 15, and is accommodated in the escape part 25 when the brush 17 is withdrawn from the brush holding hole 9.SELECTED DRAWING: Figure 1

Description

The present invention relates to a deburring brush unit.

A holder holding a linear abrasive material and a brush case accommodating the holder are screwed from the outer peripheral side of a groove-shaped guide hole provided in the brush case toward a threaded hole provided in the holder, and the brush is A polishing machine brush has been proposed in which the screwing position is adjusted in the axial direction according to the amount of wear (Japanese Patent No. 3975073).

An object of the present invention is to provide a brush unit that can automatically adjust the position of the brush in the axial direction according to the amount of wear of the wire.

One aspect of the invention is
a shank extending along the axis;
A cylinder connected to the shank,
a cylinder chamber opening in the distal direction and extending along the shank;
a guide hole extending parallel to the axis within the cylinder chamber;
a relief portion extending radially outward from the guide hole;
a cylinder having
A piston that reciprocates within the cylinder chamber,
a brush holding hole opening in the distal direction and extending parallel to the axis;
a support retaining hole extending radially through said piston;
a piston having
A brush inserted into the brush holding hole,
a brush body having a radially outwardly disposed recess;
a wire;
a brush having
a first elastic body disposed in the cylinder chamber for pushing the piston forward;
a support that is supported in the support holding hole and moves between the guide hole and the recess, and that is accommodated in the relief portion when the brush is pulled out from the brush holding hole; ,
It is a brush unit having

The brush unit is attached to the processing machine and removes burrs generated on the workpiece during cutting. Processing machines are, for example, lathes, machining centers, and turning centers. The shank of the deburring brush unit is attached to the tool spindle, and the entire deburring brush unit rotates together with the tool spindle.
For convenience of explanation, the side on which the brush is attached is referred to as the distal side, and the side on which the shank is arranged is referred to as the proximal side.

The cylinder, piston, and brush are arranged on the shank axis, which is the central axis of the shank. The power of the machine tool is transmitted from the shank. As the shank rotates, the guide hole formed in the cylinder also rotates. The guide hole, the support holding hole and the recess are engaged through the support. Rotation of the cylinder causes the guide hole to rotate the support. The support then rotates the piston and brush.

The first elastic body is elastically deformed, and the restoring force of the first elastic body pushes the piston forward.

A guide hole is formed in the cylinder parallel to the shank axis. The guide hole may be a groove formed in the inner peripheral surface of the cylinder or an elongated hole penetrating the cylinder. When the guide hole penetrates the cylinder, a cover may be provided to cover the outer peripheral surface of the cylinder.
The width of the guide hole in the lateral direction is the same as or smaller than the width of the support when viewed from the outer circumference of the cylinder toward the shank shaft.

One or more recesses are located in the brush body. The recess has a smaller cross-sectional shape as it progresses radially inward. The plurality of recesses are arranged at equal intervals on the circumference. Preferably, three or more recesses are arranged in the brush body. The recess is, for example, spherical or conical.

The support is preferably a ball or pin member. The pin member support extends radially. The supports are arranged in the same number as the recesses or a natural number multiple of the number of recesses. The support, which is a pin member, has a radially inner shape corresponding to the concave shape.

By forming the guide hole as a groove or an elongated hole, the support can move vertically along the guide hole. The brush, support, and piston are integrally reciprocated in the shank axial direction.

The wire protrudes from the cylinder by a predetermined amount of protrusion. The brush, piston and support are pressed against the first elastic body. When the brush comes into contact with the work, the wire comes into contact with the work in a state in which the wire protrudes from the cylinder by a protrusion amount corresponding to the trajectory of the brush. Even when the wire wears, the amount of protrusion of the wire from the cylinder is maintained.

The wear amount determination unit is arranged on the piston or the brush. When the wear amount of the wire reaches a predetermined amount, the wear amount determination part is exposed from the cylinder. This allows the operator to recognize when it is time to replace the brush. A plurality of wear amount determination units may be provided according to the wear amount. The wear amount determination unit may have, for example, a warning indicator that indicates when the wear limit is approaching, and a limit indicator that indicates replacement time. The warning indicator and the limit indicator may have different colors.

The relief portion is a space provided in the cylinder or cover for the support to move away from the concave portion of the brush body and move to the outer peripheral side of the piston. The inner peripheral surface of the cylinder or cover may be provided with a tapered shape that expands in diameter toward the opening, or a recessed shape.
A stopper may be provided to prevent the cover or piston from falling out of the cylinder.

When attaching the brush body to the piston, the brush body is pushed into the piston and the support is held in the recess.
When removing the brush body from the piston, the brush body or the cover is slid to move the support to the relief portion. This releases the holding of the support and removes the brush body from the piston.

According to the brush unit of the present invention, the position of the brush in the axial direction can be automatically adjusted according to the amount of wear of the wire rod.

Longitudinal sectional view of the deburring brush unit of Embodiment 1 FIG. 2 is a perspective view of the deburring brush unit of Embodiment 1; III-III line combination sectional view of FIG. (a) shows the unprocessed state of a new brush. (b) shows the state of a new brush during processing. (c) shows the state during processing of the brush which is close to the wear limit. (d) shows the state at the time of processing the brush that has reached the replacement time. Longitudinal sectional view of deburring brush unit of Embodiment 2

(Embodiment 1)
As shown in FIG. 1, the deburring brush unit 100 of this embodiment includes a shank 1, a cylinder 3, a piston 11, a support 23, a compression coil spring (first elastic body) 13, and a brush 17. , have Here, the left half of FIG. 1 shows the non-machining state with the brush 17 attached. The right half of FIG. 1 shows a state in the middle of removing the brush 17 from the piston 11 .

A shank 1 extends along a shank axis 2 . A cylinder 3 is connected to the shank 1 . The cylinder 3 has a cylindrical shape and has a cylinder chamber 4 inside. A first elastic body 13 and a piston 11 are arranged in the cylinder chamber 4 .

The cylinder 3 has a cylinder chamber 4 , an opening 6 , a guide hole 5 and a relief portion 25 . The cylinder 3 may have an external thread 32 . The male thread 32 is arranged at the tip of the cylinder 3 . The cylinder 3 is hollow cylindrical. Cylinder chamber 4 is an internal cavity of cylinder 3 . The cylinder chamber 4 has an opening 6 at its tip. The guide hole 5 extends parallel to the shank axis 2 on the inner peripheral surface of the cylinder chamber 4 . The relief portion 25 is arranged at the tip of the guide hole 5 .

The piston 11 has a support holding hole 7 and a brush holding hole 9 . The piston 11 has a hollow cylindrical shape as a whole. The piston 11 reciprocates within the cylinder 3 . The piston 11 may have a wear amount determination section 26 . The brush holding hole 9 is arranged so as to open at the tip surface of the piston 11 . The brush holding holes 9 extend axially. The support holding hole 7 extends radially from the outer peripheral surface of the piston 11 to the brush holding hole 9 . The support holding hole 7 holds the support 23 .

The wear amount determination section 26 is arranged at the tip of the piston 11 . For example, the wear amount determination section 26 has a warning instruction section 261 and a limit instruction section 262 . The warning indication portion 261 and the limit indication portion 262 are each annular. The warning indicator 261 is arranged on the tip side of the limit indicator 262 . For example, the warning indicator 261 is yellow. The limit indicator 262 is red. For example, when the wire 21 wears, the warning indicator 261 comes out from the tip of the cylinder 3 . This indicates that the time for replacement of the brush 17 is approaching. Further, when the wire rod 21 is worn, the limit indicating portion 262 comes out from the tip of the cylinder 3 . This indicates when the brush 17 should be replaced.

A stopper 28 may be provided at the tip of the cylinder 3 . As shown in FIG. 2 , the stopper 28 has an internal thread 34 , a bottom portion 37 and a passage hole 39 . Stopper 28 may be transparent. Stopper 28 may have a confirmation window 30 . The stopper 28 is, for example, a hollow cylindrical cover member. The stopper 28 is arranged at the tip of the cylinder 3 . Female thread 34 is arranged on the inner peripheral surface of stopper 28 . The female thread 34 forms a screw pair with the male thread 32 . The bottom portion 37 is arranged on the tip side of the stopper 28 . A through hole 39 is arranged in the center of the bottom portion 37 . The through hole 39 has an inner diameter larger than that of the brush 17 . Also, the passage hole 39 has an inner diameter smaller than the outer diameter of the piston 11 . This allows the brush 17 to pass through the passage hole 39 . Also, the piston 11 cannot pass through the passage hole 39 . The bottom portion 37 presses the tip portion of the piston 11 to prevent the piston 11 from falling off. A confirmation window 30 is arranged on the outer peripheral surface of the stopper 28 . The operator can visually recognize the wear amount determination portion 26 through the confirmation window 30 .

The brush 17 has a brush body 19 , six recesses 15 and a wire 21 . The brush body 19 is cylindrical. The wire 21 is arranged at the tip of the brush body 19 . The concave portion 15 is spherical and arranged on the outer cylindrical surface of the brush body 19 . The wire 21 is, for example, a composite material of abrasives and plastics. A wire 21 extends parallel to the shank axis 2 from the tip of the brush body 19 .

The support 23 is a ball. As shown in FIG. 3, the three supports 23 are held between the guide hole 5, the support holding hole 7 and the recess 15, respectively. The support 23 advances and retreats together with the piston 11 and the brush 17 along the guide hole 5 . Support 23 transmits rotation of shank 1 to brush 17 via guide hole 5 and recess 15 .

When removing the brush 17 from the deburring brush unit 100, the operator loosens the fastening of the stopper 28 and moves it toward the distal end, as shown on the right side of FIGS. The diameter of the concave portion 15 becomes smaller as it progresses radially inward. Also, the piston 11 is pushed forward by a compression coil spring 13 . Therefore, the support 23 is pushed out to the relief portion 25 . As a result, the holding of the support 23 and the brush body 19 is released. Then, the operator can pull out the brush 17 from the piston 11 .

The deburring brush unit 100 is used by being attached to a tool spindle. Torque of the tool spindle (not shown) is transmitted from the shank 1 to the deburring brush unit 100 . Burrs on the workpiece 40 are removed by rotating the brush 17 . FIG. 4(a) shows the state of the brush when it is not processed. FIG. 4(b) shows the state of a new brush during processing. FIG. 4(c) shows the state during machining of the brush nearing the wear limit. FIG. 4(d) shows the state during processing of the brush that has reached the replacement time.

The piston 11 is located at the initial set position 101 in the unprocessed state shown in FIG. 4(a).
A new brush shown in FIG. 4(b) has a protruding length 41 of the wire rod 21 during processing. Here, the protrusion length 41 is the protrusion amount of the wire rod 21 from the stopper 28 . During processing, the wire rod 21 collides with the work 40, causing the piston 11 to retreat toward the base end side. Since the wires 21 of a new brush are long, the support 23 is in the initial position 102 . The brush 17 is pressed against the work 40 by the restoring force of the spring 13 .

As shown in FIG. 4(c), as the processing time increases, the wire rod 21 wears and becomes shorter. The piston 11 is pushed out by the spring 13 and advances in the distal direction as the length of the wire rod 21 becomes shorter. The wire rod 21 causes the piston 11 to retreat toward the base end side according to the amount of wear. Therefore, the projection length 41 of the wire rod 21 is maintained. When the wire 21 reaches the wear limit, the support 23 is positioned at the replacement caution position 103 . Then, the wear amount determining portion 26 gradually protrudes from the cylinder 3 . At this time, the operator can visually recognize the yellow warning instruction portion 261 .
As shown in FIG. 4D, when the processing time is further extended, the support 23 moves to the replacement position 104 (initial setting position 101). Then, in addition to the yellow warning indicator 261 , the red limit indicator 262 protrudes from the cylinder 3 .

As shown in FIGS. 4(a) to 4(d), even if the wire rod 21 is worn and shortened, the amount of retraction of the piston 11 changes according to the amount of wear of the wire rod 21. FIG. Specifically, when the wire rod 21 is worn and shortened, the amount of retraction of the piston 11 is reduced. Therefore, the wire rod 21 always protrudes from the stopper 28 with the same protruding length 41 and always contacts the workpiece 40 . During this time, it is not necessary to change the position of the spindle by changing, for example, the tool length compensation amount.
Further, the wear amount determination portion 26 provided at the tip portion of the piston 11 emerges from the cylinder 3 due to the wire 21 being worn by the deburring process. This allows the operator to know when to replace the brush 17 .

When the wire rod 21 is made of a composite material of abrasive particles and plastic, the wire rod 21 may break if the length of the wire rod 21 protruding from the cylinder 3 is long. According to experiments conducted by the inventors, the processing capability increases when the protruding length 41 is shortened. However, shortening the protruding length 41 shortens the effective working length of the brush. Here, the effective processing length refers to the length processed until the wire rod 21 is worn away and gradually becomes shorter and can no longer be processed when it is rotated at a constant angular velocity and fed at a constant speed. . According to this embodiment, the piston 11 advances in the distal direction as the wire rod 21 wears. Therefore, even when the length of the wire rod 21 is long, the projection length 41 can be set short. Therefore, according to this embodiment, the effective machining length can be extended more effectively.
The brush unit of this embodiment can be suitably used, for example, for deburring the edge of a metal processing surface.

(Embodiment 2)
As shown in FIG. 5, the deburring brush unit 200 of this embodiment has a cylinder 36, a cover 31, an elastic body chamber 33, a compression coil spring (second elastic body) 35, and a stopper 281. . The elastic chamber 33 is provided between the cylinder 36 and the cover 31 . Here, the left half of FIG. 5 shows a non-machining state with the brush 17 attached. The right half of FIG. 5 shows the state in the middle of removing the brush 17 from the piston 11 .

The cylinder 36 has a proximal end 36a and a distal end 36b. Cylinder 36 is generally cylindrical. The thickness of the proximal end portion 36a is thicker than the thickness of the distal end portion 36b. The length of the proximal portion 36a is shorter than the length of the distal portion 36b.

The cover 31 has a proximal end portion 31a and a distal end portion 31b. The cover 31 has a hollow cylindrical shape as a whole. The cover 31 covers the outer peripheral surface of the cylinder 36 . The inner surface of the base end portion 31 a of the cover 31 slides on the outer surface of the base end portion 36 a of the cylinder 36 . The inner surface of the tip portion 31 b of the cover 31 slides on the outer surface of the tip portion 36 b of the cylinder 36 . When the cover 31 is moved in the distal direction until it abuts against the stopper 281 , the distal end of the proximal end 36 a of the cylinder 36 is positioned closer to the proximal side than the distal end of the proximal end 31 a of the cover 31 . A space, which is the elastic chamber 33 , is then formed between the cover 31 and the cylinder 36 .
A compression coil spring 35 is housed in the elastic chamber 33 .

The guide hole 5 radially penetrates the cylinder 36 .
The relief portion 25 is located on the inner peripheral surface of the tip portion 31b of the cover 31 and opens to the tip surface.
A stopper 281 is arranged at the tip of the cylinder 36 to prevent the cover 31 from coming off. The stopper 281 is, for example, a shaft retaining ring.
Other configurations of the deburring brush unit 200 are the same as those of the deburring brush unit 100 .

When removing the brush 17 from the deburring brush unit 200 , the cover 31 is pushed in toward the base end side, and the relief portion 25 is moved to the support 23 . When the brush 17 is pulled toward the tip side, the recess 15 pushes the support 23 into the relief portion 25 . As a result, the brush body 19 is released from the support 23 and the brush 17 can be removed from the deburring brush unit 200 .

Alternatively, the elastic chamber 33 and the compression coil spring 35 may be omitted, the cylinder 36 may be formed with a male thread, and the inner peripheral surface of the cover 31 may be formed with a female thread, so that the cover 31 and the cylinder 36 form a screw pair.

The present invention is not limited to the above-described embodiments, and various modifications are possible without departing from the gist of the present invention. subject to Although the above embodiments show preferred examples, those skilled in the art can realize various alternatives, modifications, variations or improvements from the contents disclosed in this specification, These are included in the technical scope described in the appended claims.

REFERENCE SIGNS LIST 100, 200 deburring brush unit 1 shank 3 cylinder 4 cylinder chamber 5 guide hole 7 support holding hole 9 brush holding hole 11 piston 13 first elastic body 15 concave portion 17 brush 19 brush body 21 wire rod 23 support 25 relief portion

Claims (11)

a shank extending along the axis;
A cylinder connected to the shank,
a cylinder chamber opening in the distal direction and extending along the shank;
a guide hole extending parallel to the axis within the cylinder chamber;
a relief portion extending radially outward from the guide hole;
a cylinder having
A piston that reciprocates within the cylinder chamber,
a brush holding hole opening in the distal direction and extending parallel to the axis;
a support retaining hole extending radially through said piston;
a piston having
A brush inserted into the brush holding hole,
a brush body having a radially outwardly disposed recess;
a wire;
a brush having
a first elastic body disposed in the cylinder chamber for pushing the piston forward;
a support that is supported by the support holding hole and moves between the guide hole and the recess, and that is accommodated in the relief portion when the brush is pulled out from the brush holding hole; ,
A brush unit. A stopper arranged at the tip of the cylinder,
A stopper having a through hole at the bottom, which has an inner diameter larger than the brush and an inner diameter smaller than the outer diameter of the piston;
The brush unit of claim 1, further comprising: The piston has a wear amount determination part at the outer peripheral end,
The brush unit according to claim 1 or 2. The wire rod has a constant protruding length from the stopper during processing before reaching the replacement time,
The brush unit according to claim 2 or 3. The recess is hemispherical or conical,
A brush unit according to any one of claims 1 to 4. the support is a ball,
A brush unit according to any one of claims 1 to 5. The support is a pin member,
A brush unit according to any one of claims 1 to 5. The cylinder is hollow cylindrical,
the relief portion extends radially outward;
A brush unit according to any one of claims 1 to 7. further comprising a cover disposed outside the cylinder and reciprocatable along the axis;
The guide hole penetrates the cylinder,
the support moves inside the cover;
The relief portion is arranged on the cover,
A brush unit according to any one of claims 1 to 8. an elastic chamber disposed between the cylinder and the cover;
a second elastic body arranged in the elastic body chamber and pushing the cover forward toward the cylinder;
A brush unit according to any one of claims 1 to 9. The brush has a plurality of wires held in the brush body,
A brush unit according to any one of claims 1 to 10.

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