JPS6147663B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a barrel device, and more particularly to a gyroscope barrel device that effectively discharges media slag in a barrel tank.

Prior Art As a barrel device, as shown in Fig. 3,
So-called gyroscope barrel devices have been provided in the past. In the figure, 1 is a rotating shaft, which is rotatably supported by a bearing 2. At the upper end of the rotating shaft 1, a barrel tank 4 which is shaped like a container and accommodates media 3 is fixedly installed, and on the side of the barrel tank 4, a plurality of holes 5 are formed and a wire mesh 6 is attached. There is. In such an apparatus, when barrel processing is performed by rotating the barrel tank 4 while holding the work in the media 3, the media slag 7 generated due to wear and tear of the media 3, etc., is transferred to the barrel tank along with the coolant. It is designed to be discharged into a receiving gutter 8 through a wire mesh 6 through a hole 5 formed in the side surface of the pipe 4.

However, in such a conventional gyroscope type barrel device, only the media slag 7 in the vicinity of the wire mesh 6 shown by the broken line in the figure is transferred to the hole 5 by centrifugal force.
Most of the media slag 7 was collected at the bottom of the barrel tank 4 and was difficult to discharge. Moreover,
During barrel processing, the media 3 is also pressed against the wire mesh due to centrifugal force, so the wire mesh 6 becomes clogged with the media 3, and eventually even the media slag 7 near the wire mesh 6 is not sufficiently discharged. It was not done.

Such media slag 7 in the barrel tank 4 reduces the efficiency of barrel machining, and due to the adhesion effect of the media slag 7 itself, it not only sticks inside the barrel tank 4 but also adheres to the workpiece and becomes difficult to process. This results in the inconvenience of significantly lowering quality.

Therefore, it is a complicated task to periodically sieve the media 3 in the barrel tank 4 and to remove the media slag 7 stuck in the barrel tank 4 by crushing it with a hammer or the like once every few months. It is needed.

In order to eliminate such inconveniences, various studies have been made on effective methods for discharging the media slag 7. For example, a method has been considered in which holes and a wire mesh are provided at the outer periphery of the bottom surface or the lower end of the side surface of the barrel tank 4 where the largest amount of media slag 7 accumulates. However, near the outer periphery of the bottom of the barrel tank 4, a large force is applied due to the centrifugal force during barrel processing and the pressure due to the weight of the media 3, so the area of the holes and wire mesh is significantly increased. It is limited. Moreover, such a part is a part of the gyroscope barrel device in which there is essentially little flow of media into the barrel tank, so the flow is even weaker in this part.
This makes it easy for the wire mesh to become clogged. Therefore, even in such an apparatus, it is still difficult to sufficiently discharge the media slag in the barrel tank.

Problems to be Solved by the Invention In order to solve this problem, it is possible to provide a hole and a wire mesh in the center of the bottom of the barrel tank 4. It is true that this method eliminates clogging of the wire mesh. However, even with such a method, the media in the barrel tank 4 hardly flows, so that what is mainly discharged is limited to the media slag near the wire mesh, and the media slag is the most likely to occur and accumulate. There was a risk that the media slag 7 deposited on a portion, for example, the outer periphery of the bottom of the barrel tank 4, would remain in the barrel tank 4 without being discharged.

Means for Solving the Problems The present invention has been made against the background of the above-mentioned circumstances, and the gist thereof is to provide a rotating shaft that is rotatably supported, a container-shaped rotating shaft, and a rotary shaft that is rotatably supported. A barrel device is provided with a barrel fixed to an upper end to accommodate a medium, and polishes a workpiece by rotationally driving the barrel tank while holding the workpiece in the medium. A discharge passage passing through the rotating shaft in the axial direction and opening at the center of the bottom of the barrel tank is formed, and a medium of normal size is passed through the discharge passage while covering the opening at the bottom of the discharge passage. A screening member is installed that has a large number of holes that prevent particles of a certain size or smaller than a predetermined size. The reason is that it is tilted at a predetermined angle.

By doing this, the rotational center line of the barrel tank and the rotating shaft is inclined at a predetermined angle with respect to the vertical line, so that when the rotational drive of the barrel tank stops, or before and after that, the barrel tank can be compared. When the barrel rotates at a slow speed, the media and media slag in the barrel tank are moved, and media slag of a certain size or less that has accumulated on the outer periphery of the bottom surface of the barrel tank is formed at the center of the bottom surface of the barrel tank. Since the media slag passes through the discharge passage, the media slag is discharged to the outside of the barrel tank through the discharge passage very efficiently.

Furthermore, since the media is moved along the surface of the sorting member, the clogging of the sorting member is suitably eliminated by an action similar to the sorting action of a sieve.

Effects of the Invention Therefore, media slag remains on the outer periphery of the bottom of the barrel tank and is properly removed from the inside of the barrel tank, improving the quality of barrel-processed products and eliminating media slag. The effect of this is that the complicated work to remove is reduced, and work efficiency is greatly improved.

Embodiment Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 1 shows the main parts of the gyro type barrel device of this embodiment. The rotating shaft 20 is rotatably supported around the axis by a bearing (not shown) on a base (not shown). Rotating shaft 20
A through hole 22 is formed in the axial direction, and a V pulley 24 is attached near the lower end on the outer peripheral side of the rotating shaft 20. Rotational driving force is transmitted from the

A barrel tank 28 having a cylindrical shape with a bottom and housing a media 30 therein is fixed to the upper end of the rotating shaft 20. It is tilted by an angle (approximately 30° in this example). The barrel tank 28 is composed of a side circumferential portion 32 and a bottom portion 34, and a plurality of rectangular holes 36 are formed on one circumference near the vertical center of the side circumferential portion 32. A wire mesh 38 is attached from the outside so as to cover the wire mesh 36. Further, in the center of the bottom portion 34, a hole 40 is provided which has a larger diameter than the through hole 22 formed in the rotating shaft 20 and forms a discharge passage together with the through hole 22. 22
Continuing from the upper end, a tapered surface 42 is formed, the diameter of which increases upwardly. A wire mesh 44 as a sorting member is attached above the hole 40. Here, the meshes of the wire meshes 38 and 44 prevent the passage of a medium 30 of a normal size for barrel processing, but allow the passage of media slag 46 generated due to breakage, wear, etc. of the media 30. The size is set to be such that a medium of approximately 1/4 to 1/5 of the normal size of the medium 30 can pass through.

Further, the size of the opening at the upper end of the extraction hole 40 having the tapered surface 42 is set to a size that allows the media slag 46 to be discharged through the wire mesh 44 even when the barrel tank 28 is rotating. That is,
While the barrel tank 28 is rotating, the media 30
is moved toward the outer circumference by the action of centrifugal force,
Near the axis of the barrel tank 28, a substantially conical space is formed that becomes smaller in diameter toward the bottom 34. In this state, the media 30 has a ring shape, and the first
As shown in the figure, a media ring is formed, and the diameter of the opening at the upper end of the hole 40 is larger than the minimum inner diameter of the media ring.

Above the barrel tank 28, a work holding device 48 is provided.
and an injection pipe 50 are arranged, and the workpiece holding device 4
A workpiece 52 is removably held at the lower end of the workpiece 8 and can be moved up and down. The injection pipe 50 is connected to a coolant supply device (not shown), and regardless of whether the barrel tank 28 rotates or stops,
Coolant is continuously supplied into the barrel tank 28. Further, an annular return plate 58 in which a circular hole having a diameter slightly smaller than the diameter of the barrel tank 28 is formed is provided at the upper end opening of the barrel tank 28 .

Next, the operation of the barrel device having the above configuration will be explained.

A large number of media 30 are housed in the barrel tank 28, and coolant is constantly poured from the injection pipe 50. Next, after the workpiece 52 held by the workpiece holding device 48 is inserted into the media 30, the workpiece 52 is moved together with the rotating shaft 20 into the barrel tank 20 by the rotational driving force transmitted from a motor (not shown) via the V-belt 26. When rotated, the surface of the work 52 is subjected to barrel processing due to friction between the work 52 and the media 30 rotating together with the barrel tank 28. When the barrel processing of the workpiece 52 is completed, the rotation of the barrel tank 28 is stopped, and the workpiece 52 is held on the media 3 by the workpiece holding device 48.
After being pulled up from inside the workpiece 52, it is removed, and the barrel processing operation for one workpiece 52 is completed.

When such barrel machining is repeated, the media 30 is damaged and worn due to collision with the workpiece 52 or mutual collision of the media 30, so that countless media slag 46 is generated in the barrel tank 28. It is mainly deposited on the bottom 34 of the barrel tank 28.

Here, while the rotation of the barrel tank 28 is stopped or during low-speed rotation before and after that, the media 30 located on the higher side of the inclined bottom part 34 of the barrel tank 28 is moved in the direction of the arrow in the figure. hand,
The state will be as shown by the dashed line. This media 3
0 is moved along the surface of the wire mesh 44,
At this time, due to the movement of the media 30, the media slag 46 at the outer periphery of the bottom 34 of the barrel tank 28, which is the part where media slag 46 is most likely to occur and accumulate, is moved on the wire mesh 44, and the media slag 46 is moved over the wire mesh 44. 4
4 and is discharged from the through hole 22 to the outside of the device in an extremely efficient manner. In addition, the media 3
0, the clogging of the wire mesh 44 is effectively eliminated by an action similar to the sorting action by a sieve (hereinafter referred to as sieving action). That is, the movement of the media 30 relative to the wire mesh 44 and the accompanying vibration effectively eliminate clogging of the wire mesh 44, and at the same time remove not only the media slag 46 that has been moved together with the media 30 but also the media attached to the wire mesh 44. Even the slag 46 passes through the hole 40 provided in the bottom 34 of the barrel tank 28 and falls into the through hole 22 formed in the rotating shaft 20, together with the coolant constantly supplied from the injection pipe 50, and falls into the device. It is effectively filtered out and discharged.

Next, when the barrel tank 28 is rotated,
The media 30 is moved toward the outer periphery under the action of centrifugal force, and becomes in the state shown in the figure. Due to this movement of the media 30 toward the outer periphery, the wire mesh 4
The media 30 on the top 4 is also moved along the surface of the wire mesh 44, and a sieving action is performed, resulting in the same discharge effect as when the rotational drive is stopped.

As described above, according to the apparatus of this embodiment, the barrel tank 28 is rotated and stopped each time the barrel processing of an individual work 52 is performed, so the stopping position in the rotational direction of the barrel tank 28 is different each time it is stopped. The media slag 46 is discharged from all over the media 30 in the barrel tank 28. That is,
Due to the movement of the media 30 at the beginning of the rotational drive of the barrel tank 28 and during the rotation, the conventional barrel tank 2
The media slag 46 that has accumulated on the outer periphery of the bottom 34 of the metal mesh 8 and is difficult to be discharged is effectively discharged from the hole 40, and the clogging of the wire mesh 44 is effectively eliminated. As a result, the quality of the barrel-processed product is improved, and the troublesome cleaning work of removing media slag 46 adhering to the barrel tank 28 is also reduced.

Moreover, since coolant is constantly supplied from the injection pipe 50 regardless of whether the barrel tank 28 is rotating or stopping, the media slag 46 is discharged from the extraction hole 40 together with the coolant even when the barrel tank 28 is stopped. .

Furthermore, in this embodiment, in order to increase the diameter of the upper end opening of the extraction hole 40, the extraction hole 40 and the through hole 2
A tapered surface 42 is formed on the rotary shaft 20 to keep the diameter of the rotating shaft 20 to the minimum necessary size. Therefore, an expensive large-diameter bearing or the like is not required to rotatably support the rotary shaft 20, so that the device can be constructed at low cost.

Next, other embodiments of the present invention will be described.
Note that parts common to those in the above-described embodiments are denoted by the same reference numerals, and explanations thereof will be omitted.

In FIG. 2, a rotating shaft 78 rotatably supported by a bearing 76 has a through hole 82 having a tapered surface 80 at its upper end.
A barrel tank 84 is fixed to the upper end surface of the rotating shaft 78, and the barrel tank 84 includes a return part 86, a side peripheral part 88,
It is integrally constructed from a tapered bottom portion 90 and a bottom portion 92. The upper part of the side circumferential part 88 is the return part 8
It is formed in a tapered shape that becomes smaller as the diameter approaches 6, but no holes are formed. The tapered bottom part 90 is formed in a tapered shape whose diameter becomes smaller toward the bottom part 92, and a plurality of holes 94 are provided to which a wire mesh 96 is attached. bottom 92
, a tapered surface 80 formed in the through hole 82
A hole 98 having the same diameter as the upper end diameter and forming a discharge passage together with the through hole 82 is provided, and a wire mesh 100 as a sorting member is fitted into the upper end of the hole 98. The barrel tank 84 configured as described above and the rotating shaft 78 have their rotation center lines set at a predetermined angle (approximately in this embodiment) with respect to the vertical line.
It is tilted at an angle of 45°. In addition,
The mesh sizes of the wire meshes 96 and 100 are the same as in the previous embodiment. Further, the angle of inclination of the tapered bottom portion 90 with respect to a plane perpendicular to the center line of rotation is approximately 45°.

In this way, when the rotation of the barrel tank 84 is stopped, the media 30 at the higher position is moved in the direction of the arrow in the figure in a state close to gravity fall, and the state shown by the dashed line is reached. Become. The media 30 to be moved at this time is the workpiece 52.
Since media slag 46 is present in areas where media slag 46 is generated by collision with other objects and areas where media slag 46 is likely to accumulate, and contains a large amount of media slag 46, discharging media slag 46 is extremely effective. It is done according to purpose. Further, the wire mesh 96 is a media slag 46.
The media 30 near the wire mesh 96 can be relatively stirred by the workpiece 52, so that the media slag 46 is easily accumulated. is discharged more effectively.

Therefore, since the media 30 in the areas where the largest amount of media slag 46 is generated and the areas where it is most likely to accumulate is moved over the wire meshes 96 and 100, both of the effects of the above-described embodiments can be obtained. The effect of discharging the media slag 46 is greatly improved. By setting the inclination angle of the rotating shaft 78 sufficiently large in this way, the momentum of the moving media 30 becomes impactful, and the effect of sufficiently removing the media slag 46 is greatly increased. According to the inventor's experiments, the larger the inclination angle of the rotating shaft 78 of the barrel tank 84, the more the media slag 46
While the evacuation effect of the workpiece holding device 4 increases,
Since structural and workability problems arise in connection with the media sludge 46, etc., when the inclination angle of the rotating shaft 78 is set between 30° and 60°, a suitable media slag 46 discharge effect can be easily obtained.

Although one embodiment of the present invention has been described above in detail based on the drawings, the present invention can also be applied to other aspects.

For example, even if the size of the upper end opening of the extraction hole 40 of the barrel device shown in FIG. 1 is smaller than the minimum inner diameter of the media ring formed during the rotation of the barrel tank 28, By moving the media 30 by stopping, the media slag 46 can be effectively discharged.

Further, in the above-mentioned embodiments, the wire meshes 44, 100 are used as the sorting members, but many circular holes or slits are formed to allow particles smaller than a predetermined size to pass through. Of course, a steel plate may also be used. In this case,
If a high-strength steel plate is used, the diameter of the sorting member can be increased, and the effect of discharging the media slag 46 can be further improved.

The above-mentioned embodiment is merely one embodiment of the present invention, and various modifications may be made to the present invention without departing from the spirit thereof.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view showing essential parts of a barrel device showing an embodiment of the present invention. FIG. 2 is a diagram corresponding to FIG. 1 showing another embodiment of the present invention. FIG. 3 is a sectional view showing a conventional barrel device. 20, 78: Rotating shaft, 22, 82: Through hole (discharge passage), 40, 98: Extraction hole (discharge passage), 28,
84: Barrel tank, 30: Media, 44,10
0: Wire mesh (sorting member), 52: Workpiece.

Claims (1)

[Scope of Claims] 1. A rotating shaft rotatably supported, and a container-shaped barrel tank fixed to the upper end of the rotating shaft to house a medium, and holding a workpiece in the medium. In the barrel device for polishing the workpiece by rotationally driving the barrel tank, the rotating shaft has a discharge passage that passes through the rotating shaft in the axial direction and opens at the center of the bottom surface of the barrel tank. a plurality of holes that cover the opening at the bottom of the discharge passageway and prevent the passage of normal-sized media but allow the passage of particles of a predetermined size or less. 1. A barrel device, characterized in that a sorting member having a hole is attached thereto, and the center line of rotation of the barrel tank and the rotating shaft is inclined at a predetermined angle with respect to a vertical line. 2. Claim 1, wherein the diameter of the opening of the discharge passageway to the bottom surface of the barrel tank is formed to be larger than the minimum inner diameter of a media ring formed in an annular shape during rotation of the barrel tank. Barrel device as described in Section. 3. The barrel device according to claim 1 or 2, wherein the barrel tank has a tapered bottom portion whose inner diameter decreases as it approaches the bottom surface.