JP2020131313A - Barrel polishing device - Google Patents

Abstract

To improve polishability while suppressing the scattering of a polishing material.SOLUTION: A barrel polishing device A comprises: a top surface-opened barrel tank 30 which can rotate about a vertical barrel shaft 34 as a center and which internally accommodates a polishing material M; a support member 25 provided above the barrel tank 30; and a rotating shaft 26 which is supported by the support member 25, which assumes such a shape as to be extended in a radial direction toward a peripheral wall part 32 of the barrel tank 30 from the side of the barrel shaft 34 in a plan view, and which has a workpiece W held at an extended end.SELECTED DRAWING: Figure 1

Description

The present invention relates to a barrel polishing apparatus.

Patent Document 1 discloses a barrel polishing apparatus in which an abrasive is housed in a processing tank that rotates about an axis in the vertical direction, and a workpiece is immersed in the abrasive for polishing. Above the processing tank, a turret that rotates around the revolution axis in the vertical direction is provided. A vertical rotation shaft (workpiece shaft) is provided at the eccentric position of the turret, and the work piece is chucked at the lower end of the rotation shaft. The workpiece is polished by planetary rotation in the abrasive.

Japanese Unexamined Patent Publication No. 03-21262

In order to increase the polishing force in the above device, the pressing force of the abrasive on the workpiece may be increased by increasing the revolving radius of the workpiece and increasing the centrifugal force of the abrasive in the vicinity of the workpiece. However, if the revolution radius of the workpiece is increased, the rotation axis approaches the peripheral wall portion of the processing tank, so that there is a concern that the abrasive material that has been blown off by the rotation axis may scatter to the outside of the processing tank. In order to suppress the scattering of the abrasive material, the revolution radius of the workpiece may be reduced, but this will reduce the polishing power.

The present invention has been completed based on the above circumstances, and an object of the present invention is to increase the polishing power while suppressing the scattering of the abrasive material.

The present invention
A barrel tank with an open top that can rotate around the barrel axis in the vertical direction and contains abrasives inside.
A support member provided above the barrel tank and
It is supported by the support member and extends in the radial direction from the barrel shaft side toward the peripheral wall portion of the barrel tank in a plan view, and is provided with a rotating shaft at which the work is held at the extending end portion. There is.
The "vertical direction" in the present invention is not limited to the vertical direction, but also includes a direction in which the abrasive material contained in the barrel tank is tilted to such an extent that it does not flow out to the outside of the barrel tank due to centrifugal force or gravity.

The work held at the extending end of the rotating shaft is polished while relatively planetary rotating in the rotating abrasive. Polishing with an abrasive is performed in a region relatively close to the peripheral wall, that is, in a region where a large centrifugal force acts on the abrasive, and therefore has excellent polishing power. Further, in the surface layer portion of the abrasive material stored in the barrel tank, a part of the abrasive material is repelled by the rotating shaft, but the rotating shaft of the surface layer portion of the abrasive material is relatively far from the peripheral wall portion. It is an area. Therefore, even if a part of the abrasive is blown off by the rotating shaft, there is no possibility that it will be scattered to the outside of the barrel tank. As described above, according to the present invention, it is possible to increase the polishing power while suppressing the scattering of the abrasive material.

It is a partial notch side view which shows the polishing process in the barrel polishing apparatus of Example 1. FIG. It is a partially enlarged side sectional view of FIG. Side view showing the state where the axis of the rotation axis is oriented in the vertical direction

In the present invention, the support member is attached to a swinging shaft whose axis is directed in a direction different from that of the barrel shaft, and the support member and the rotating shaft swing in the vertical direction about the swinging shaft. You may be able to do it. According to this configuration, the inclination of the rotation axis, the position of the work, and the like can be adjusted according to the inner diameter of the barrel tank, the shape of the surface layer portion of the abrasive material when the barrel tank is rotated, and the like.

In the present invention, the peripheral wall portion may be provided with a covering portion in a form extending inward in the radial direction above the abrasive material. According to this configuration, even if the abrasive is blown upward in the vicinity of the peripheral wall portion, it is possible to prevent the abrasive from being scattered to the outside of the barrel tank.

In the present invention, the support member may be rotatable in the direction opposite to that of the barrel tank about a revolution axis parallel to the barrel axis. According to this configuration, the relative speed difference between the work that revolves with the rotation of the support member and the abrasive material that rotates in the same direction as the barrel tank becomes large, so that the polishing force is enhanced. Further, in order to obtain a high polishing force without revolving the work, it is necessary to increase the rotation speed of the barrel tank. In this case, the centrifugal force acting on the polishing material becomes large, and the parabolic force on the surface layer of the polishing material becomes large. Since the degree of deformation of the shape becomes large, the position of the surface layer portion of the abrasive material becomes high near the peripheral wall portion, and the abrasive material easily scatters. However, with the above configuration, since a relative speed difference is generated by the rotation of the revolving work and the barrel tank, the degree of parabolic deformation in the surface layer portion of the abrasive is gentle, and the abrasive is less likely to scatter.

In the present invention, the revolution axis may be coaxial with the barrel axis. According to this configuration, in the process of revolving the work in the barrel tank, the relative speed difference between the revolving work and the abrasive in the barrel tank is kept constant, so that the polishing force is kept almost constant. Is done.

In the present invention, the abrasive may be an amorphous ceramic medium. According to this configuration, the polishing material can be brought into contact with the concave portion of the work, so that the polishing efficiency is excellent.

The "indeterminate form" in this configuration is defined as a shape having an asymmetric cross section. Specific examples of "indeterminate form" include a shape in which a plurality of curved surfaces having different sizes, shapes and curvatures are connected by a ridge line, a shape composed of a plurality of planes having different sizes and shapes, a shape composed of a curved surface and a plane, etc. There is.

<Example 1>
Hereinafter, Example 1 that embodies the present invention will be described with reference to FIGS. 1 to 3. The barrel polishing device A of the first embodiment includes a 6-axis vertical articulated robot 10 and a barrel tank 30. In the following description, with respect to the vertical direction, the directions appearing in FIGS. 1 to 3 are defined as upward and downward as they are.

The vertical articulated robot 10 has a base 11 fixed to the floor surface. On the upper surface of the base 11, a turntable 13 that can rotate in the horizontal direction about the first axis 12 in the vertical direction is provided. A second axis 14 in the horizontal direction is provided at a position of the turntable 13 eccentric from the first axis 12 in a plan view. A base end portion 16 (lower end portion) of the first arm 15 is swingably attached to the second shaft 14.

A third shaft 18 parallel to the second shaft 14 is provided at the tip 17 (upper end) of the first arm 15. A base end portion 20 (upper end portion) of the second arm 19 is swingably attached to the third shaft 18. The second arm 19 is provided with a fourth axis 22 whose axis is aligned with the length direction of the second arm 19. The axis of the fourth axis 22 has a different orientation from the axis of the third axis 18. A rotating member 23 that can rotate around the fourth shaft 22 is rotatably attached to the tip portion 21 (lower end portion) of the second arm 19.

The rotating member 23 is provided with a swing shaft 24 (fifth shaft) whose axis is directed in a direction different from that of the fourth shaft 22. A support member 25 is swingably attached to the swing shaft 24. A rotating shaft 26 is attached to the support member 25 with its axis directed in a direction orthogonal to the swing shaft 24. The rotating shaft 26 is exposed to the outside of the support member 25 in a state of protruding from the outer surface of the support member 25. The work W is removable from the extending end of the rotating shaft 26 so that the work W can rotate integrally.

The first shaft 12, the second shaft 14, the third shaft 18, the fourth shaft 22, the swing shaft 24, and the rotary shaft 26 are all rotationally driven by a motor (not shown). The rotation of these 6 axes 12, 14, 18, 22, 24, 26 can be controlled based on information obtained by teaching in advance, a preset operation pattern, a program, or the like. By appropriately rotating the five axes 12, 14, 18, 22, and 24 excluding the rotation axis 26, the positions of the rotation axis 26 and the work W in the three-dimensional direction, the direction in the three-dimensional direction, and the movement path in the three-dimensional direction can be determined. It can be controlled arbitrarily. By controlling the rotation of the rotating shaft 26 together with the rotation control of the five axes 12, 14, 18, 22, and 24, the work W and the abrasive M can be brought into contact with each other to perform barrel polishing.

There are three orientations of the rotating shaft 26: a form in which the axis of the rotating shaft 26 is oriented in the vertical direction (see FIG. 3), a form in which the axis is inclined (see FIGS. 1 and 2), and a form in which the axis is oriented in the horizontal direction. The form is possible. The movement path (movement form) of the rotating shaft 26 and the work W is a combination of a form of revolving (turning) around a vertical axis, a form of moving in the vertical direction, a form of moving in the horizontal direction, and a combination of these movement forms. The form is possible. It is also possible to fix the position of the rotating shaft 26 and rotate only the rotating shaft 26.

The barrel tank 30 has a bottomed cylindrical shape with an open upper surface. That is, the barrel tank 30 has a horizontal bottom wall portion 31 having a circular shape in a plan view, a cylindrical peripheral wall portion 32 extending upward from the outer peripheral edge of the bottom wall portion 31, and a covering portion 33. The barrel tank 30 is rotatably supported by a barrel shaft 34 provided on the support base 36. The barrel shaft 34 is attached to the support base 36 with its axis oriented in the vertical direction, and is rotationally driven by a motor (not shown). The bottom wall portion 31 of the barrel tank 30 is coaxially fixed to the upper end portion of the barrel shaft 34. The "vertical direction" of the barrel shaft 34 in the first embodiment is not limited to the vertical direction, and is tilted to such an extent that the abrasive M housed in the barrel tank 30 does not flow out to the outside of the barrel tank 30 due to centrifugal force or gravity. Including the direction.

A plurality of polishing materials M for polishing the surface of the work W by sliding contact with the work W are housed in the barrel tank 30. The abrasive M is made of an amorphous ceramic medium. The "ceramic media" is a binder that uses a clay binder or other ceramic raw material as a binder and contains (or does not contain) abrasive grains. In the first embodiment, the "indeterminate form" is defined as a shape having an asymmetric cross section, and includes a shape having a recess on the surface. Specific "indefinite shapes" include a shape in which a plurality of curved surfaces having different sizes, shapes and curvatures are connected by a ridge line, a shape composed of three or more types of planes having different sizes and shapes, and a curved surface and a plane. Moreover, there is a shape in which at least one surface of a curved surface and a flat surface is composed of a plurality of types of surfaces having different sizes and shapes. Therefore, shapes whose cross sections are line-symmetrical or point-symmetrical, such as spherical shapes, regular polyhedron shapes, and columnar shapes (pillars), are not included in the "indeterminate form".

Since the abrasive M of the first embodiment is made of an amorphous ceramic medium, the abrasive M can be reliably brought into contact with the recesses of the work W, and the polishing efficiency is excellent. On the other hand, when the abrasive material M is a medium other than the irregular shape, for example, in the case of a spherical medium, the abrasive material M scatters out of the barrel tank 30 severely. Further, when the abrasive material M has a columnar shape such as a triangular columnar shape or a columnar shape, the abrasive material M also hits the concave portion of the work W, so that the polishing power is excellent, but it is received when the abrasive material M hits the rotating shaft 26. Since the resistance becomes large, the abrasive material M is scattered. Therefore, the indefinite shape of the abrasive M of the first embodiment has an appropriate catching resistance to the work W, exhibits a high polishing force, and the abrasive M is less scattered, so that the shape is suitable as a medium. Is.

The covering portion 33 has a form extending inward in the radial direction from the upper end edge (opening edge portion of the barrel tank 30) of the peripheral wall portion 32 in a plate shape. That is, the covering portion 33 is arranged above the abrasive material M housed in the barrel tank 30. The plan view shape of the covering portion 33 is an annular shape coaxial with the barrel tank 30. The circular region inside the covering portion 33 of the upper surface of the barrel tank 30 is open upward (outside the barrel tank 30).

Next, an example of barrel polishing using the vertical articulated robot 10 and the barrel tank 30 will be described. Outside the barrel tank 30, the work W is chucked and attached to the extending end of the rotating shaft 26 so that it can rotate integrally. The barrel tank 30 containing a predetermined amount of the abrasive M is rotated at a low speed. The rotating shaft 26 and the work W are inserted into the abrasive M of the barrel tank 30 rotating at a low speed. At this time, since the centrifugal force acting on the abrasive material M is relatively small, the resistance when the work W and the rotating shaft 26 are inserted into the abrasive material M can be small. The support member 25 is not inserted into the abrasive M and is located in the vicinity of the upper surface opening of the barrel tank 30.

After inserting the rotating shaft 26 and the work W into the abrasive M, the rotation speed of the barrel tank 30 is increased, and the turntable 13, the first arm 15, the second arm 19, and the support member 25 are swung and rotated. The member 23 and the rotating shaft 26 are rotated. As a result, the work W is placed at a predetermined height position and a predetermined radial position in the barrel tank 30. In a plan view, the rotating shaft 26 revolves around the revolving shaft 35 coaxial with the barrel tank 30 (barrel shaft 34) and rotates around the rotating shaft 26. As described above, the revolution direction and the rotation direction of the rotating shaft 26 that rotates the planet in the plan view are opposite to the rotation direction of the barrel tank 30. The rotation speed and the revolution speed of the rotating shaft 26 may be the same speed or different speeds from each other.

In the process of planetary rotation of the rotating shaft 26, the rotating shaft 26 maintains a direction extending radially outward from the support member 25 toward the peripheral wall portion 32 in a plan view. Therefore, in a plan view, the work W rotates while revolving along a circular locus closer to the peripheral wall portion 32 than the support member 25. In a plan view, the movement locus of the rotation shaft 26 on the surface layer portion S (surface) of the abrasive material M is farther from the peripheral wall portion 32 than the movement locus of the work W that rotates on a planet.

As described above, the rotating shaft 26 and the work W rotate on a planetary basis, and the work W rotates about the rotating shaft 26 in the abrasive material M, so that the abrasive material M slides on the surface of the work W and the work W becomes in contact with the surface of the work W. Be polished. In a plan view, the position of the work W is far from the center of rotation (barrel shaft 34) of the barrel tank 30, so that the abrasive M that comes into contact with the work W in the radial outward direction strongly hits the work W due to a large centrifugal force. Demonstrates high polishing power.

Further, since the rotating shaft 26 is oriented so as to extend diagonally downward from the support member 25, the position of the work W in the vertical direction is a low position relatively close to the bottom wall portion 31. The abrasive M, which is in downward contact with the work W, strongly hits the work W by receiving the weight of the abrasive M above it, and thus exhibits high polishing power.

Further, in the surface layer portion S of the abrasive material M, since a part of the abrasive material M is repelled upward by the rotating rotating shaft 26, there is a concern that the repelled abrasive material M may be scattered to the outside of the barrel tank 30. To. However, the surface layer portion S of the abrasive material M that rotates integrally with the barrel tank 30 is deformed into a parabolic shape by centrifugal force, and the closer to the barrel shaft 34 (that is, the farther from the peripheral wall portion 32), the more the abrasive material M is. The position of the surface layer portion S becomes low. Since the rotating shaft 26 extends diagonally downward from the support member 25 toward the peripheral wall portion 32, the position of the rotating shaft 26 on the surface layer portion S of the abrasive M is relatively far from the peripheral wall portion 32 and relatively low. The position. Therefore, even if the abrasive material M is repelled by the rotating shaft 26, the abrasive material M does not jump over the peripheral wall portion 32 and scatter to the outside of the barrel tank 30, and falls into the barrel tank 30.

Further, even if the abrasive material M is vigorously repelled, the covering portion 33 projects inward from the upper end edge of the peripheral wall portion 32, so that the repelled abrasive material M hits the lower surface of the covering portion 33 and is inside the barrel tank 30. Fall into. As a result, it is possible to more reliably prevent the abrasive material M from scattering to the outside of the barrel tank 30.

As described above, the barrel polishing device A of the first embodiment includes a barrel tank 30, a support member 25, and a rotating shaft 26. The barrel tank 30 has a bottomed cylindrical shape with an open upper surface, and is rotatable about a barrel shaft 34 in the vertical direction. Abrasive material M is housed inside the barrel tank 30. The support member 25 is provided above the barrel tank 30. The rotating shaft 26 is supported by the support member 25, and when polishing is performed, the rotating shaft 26 extends in the radial direction from the barrel shaft 34 side toward the peripheral wall portion 32 of the barrel tank 30 in a plan view. The work W is integrally rotatably held at the extending end of the rotating shaft 26.

The work W held at the extending end of the rotating shaft 26 is polished in the polishing material M of the rotating barrel tank 30 while rotating planetarily relative to the barrel tank 30 in a plan view. Polishing with the abrasive M is performed in a region relatively close to the peripheral wall portion 32, that is, in a region where a large centrifugal force acts on the abrasive M, and thus is excellent in polishing power.

Further, in the surface layer portion S of the abrasive material M stored in the barrel tank 30, a part of the abrasive material M is flicked off by the rotating shaft 26, but the rotating shaft 26 of the surface layer portion S of the abrasive material M comes into contact with the rotating shaft 26. Is a region relatively far from the peripheral wall portion 32. Therefore, even if a part of the abrasive M is blown off by the rotating shaft 26, there is no possibility that the abrasive material M is scattered to the outside of the barrel tank 30. As described above, according to the barrel polishing apparatus A of the first embodiment, the polishing power can be increased while suppressing the scattering of the abrasive material M.

Further, the support member 25 is attached to a swing shaft 24 whose axis is directed in a direction different from that of the barrel shaft 34, and the support member 25 and the rotation shaft 26 swing in the vertical direction about the swing shaft 24. I'm getting it. According to this configuration, the inclination of the rotating shaft 26 and the position of the work W can be adjusted according to the inner diameter of the barrel tank 30, the shape of the surface layer portion S of the abrasive M when the barrel tank 30 is rotated, and the like. it can.

Further, the peripheral wall portion 32 of the barrel tank 30 is provided with a covering portion 33 in a form extending inward in the radial direction above the abrasive material M. According to this configuration, even if the abrasive material M of the surface layer portion S is flipped upward in the vicinity of the peripheral wall portion 32, it is possible to prevent the abrasive material M from scattering to the outside of the barrel tank 30.

Further, in a plan view, the support member 25 may be rotatable in the direction opposite to that of the barrel tank 30 about the revolution shaft 35 parallel to the barrel shaft 34. According to this configuration, the relative speed difference between the work W that revolves with the rotation of the support member 25 and the abrasive material M that rotates in the same direction as the barrel tank 30 becomes large, so that the polishing force is enhanced. Further, since the revolving shaft 35 is set coaxially with the barrel shaft 34, in the process of revolving the work W in the barrel tank 30, the revolving work W and the abrasive M in the barrel tank 30 are relative to each other. The speed difference is kept constant. As a result, the polishing power is kept substantially constant.

Further, in order to obtain the same high polishing force as in the first embodiment without revolving the work W, it is necessary to increase the rotation speed of the abrasive material M in the barrel tank 30 by the revolution speed of the work W. In this case, the centrifugal force acting on the abrasive material M increases, and the degree of parabolic deformation of the surface layer portion S of the abrasive material M increases. Therefore, the position of the surface layer portion S of the abrasive material M is high near the peripheral wall portion 32. Therefore, the abrasive material M is likely to be scattered to the outside of the barrel tank 30. However, in the first embodiment, the work W is revolved in the direction opposite to that of the abrasive M in the barrel tank 30, so that a large relative speed difference between the work W and the abrasive M is secured. The rotation speed of M is suppressed to a relatively low speed. As a result, the degree of parabolic deformation of the surface layer portion S of the abrasive material M becomes gentle, so that there is an advantage that the abrasive material M is less likely to scatter.

<Other Examples>
The present invention is not limited to the examples described by the above description and drawings, and for example, the following examples are also included in the technical scope of the present invention.
(1) In the first embodiment, the rotating shaft is supported so as to be swingable, but the posture of the rotating shaft may be constant.
(2) In the first embodiment, the peripheral wall portion is provided with a covering portion, but the peripheral wall portion may be in a form in which the covering portion is not provided.
(3) In the first embodiment, the covering portion is provided at the upper end edge of the peripheral wall portion (opening edge portion of the barrel tank), but the covering portion may be provided at a position lower than the upper end edge of the peripheral wall portion.
(4) In the first embodiment, the support member is rotated in the direction opposite to that of the barrel tank, but the support member may be fixed without rotating.
(5) In the first embodiment, the revolution axis of the support member is coaxial with the barrel axis, but the revolution axis may be eccentric with respect to the barrel axis.
(6) In the first embodiment, the abrasive is a ceramic medium having an irregular shape (a shape with an asymmetric cross section), but the shape of the abrasive may be a shape having a line-symmetrical cross section or a point-symmetrical cross section. The binder of the abrasive may be a metal, a synthetic resin, or the like.
(7) In the first embodiment, the motor is used as the driving means for rotating the six axes of the vertical articulated robot, but the driving means for the six axes is not limited to the motor, and a hydraulic cylinder can also be used.
(8) In the first embodiment, a 6-axis vertical articulated robot is used, but an articulated robot having 5 or less axes may be used.

A ... Barrel polishing device M ... Abrasive material W ... Work 24 ... Swinging shaft 25 ... Support member 26 ... Rotating shaft 30 ... Barrel tank 32 ... Peripheral wall part 33 ... Covering part 34 ... Barrel shaft 35 ... Revolution shaft

Claims (6)

A barrel tank with an open top that can rotate around the barrel axis in the vertical direction and contains abrasives inside.
A support member provided above the barrel tank and
It is supported by the support member and extends in the radial direction from the barrel shaft side toward the peripheral wall portion of the barrel tank in a plan view, and is provided with a rotating shaft at which the work is held at the extending end portion. A barrel polishing device characterized by being present. The support member is attached to a swing shaft whose axis is directed in a direction different from that of the barrel shaft.
The barrel polishing apparatus according to claim 1, wherein the support member and the rotating shaft can swing in the vertical direction about the swinging shaft. The barrel polishing apparatus according to claim 1 or 2, wherein the peripheral wall portion is provided with a covering portion in a form extending inward in the radial direction above the polishing material. The barrel polishing according to any one of claims 1 to 3, wherein the support member can rotate in a direction opposite to that of the barrel tank about a revolution axis parallel to the barrel axis. apparatus. The barrel polishing apparatus according to claim 4, wherein the revolution shaft is coaxial with the barrel shaft. The barrel polishing apparatus according to any one of claims 1 to 5, wherein the polishing material is an amorphous ceramic medium.

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