JPH0313033B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vertical barrel device that rotates a barrel around a vertical axis and inserts and holds a workpiece into a medium within the barrel.

In this type of barrel device, by rotating the barrel tank, the media inside the barrel rotates together with the barrel tank.Therefore, by attaching the workpiece to an appropriate holder and inserting it into the media, the media and workpiece can be connected. It is well known that the workpiece is polished due to the relative speed difference between the two. By the way, conventionally, as a work holding device in this type of barrel device,
A multi-axis head with a large number of chucks is rotatably indexable and movable up and down, and by lowering the multi-axis head into the barrel tank, the workpiece attached to the chuck can be inserted into the media.
There are known devices configured to retain the information. However, with such a workpiece holding device, a large number of workpieces can be inserted and held in the media at the same time, but when the workpieces are attached to and removed from the chuck, the multi-axis head must be rotated to move each chuck to the work station. Since the workpieces must be indexed and positioned one by one on the side, the more chucks there are, the longer it takes to attach and detach the workpieces.In addition, the multi-axis head must be moved upwards until all the chucks have been attached to the workpieces. Therefore, if a workpiece that does not require attachment or detachment is attached to one of the chucks, the polishing of that workpiece will be interrupted only while the multi-axis head is being pulled up, reducing machining efficiency. It was hot. In order to solve this problem, it is possible to configure each chuck to move up and down individually, but in this way, the multi-axis head is given a rotary indexing function and a lifting and lowering function for each chuck. This creates the problem that the equipment is very large and expensive.

This invention was made in view of the above circumstances, and is a vertical barrel that can improve processing efficiency by shortening the so-called idle time that is not directly used for polishing, and has a simple and inexpensive workpiece holder structure. The purpose is to provide a device.

That is, in this invention, a large number of work-holding arms are radially attached to a horizontal rotating shaft, and a workpiece device part that loosely fits and holds a work is provided at the tip of each work-holding arm, and these work-holding arms are attached to the horizontal axis. By rotating together with the rotating shaft, the workpiece attached to the workpiece mounting part is configured to pass through the medium and above the medium in the barrel tank having a spherical inner peripheral surface that is rotationally driven around the vertical axis. Therefore, according to the present invention, when a workpiece attached to any one of the workpiece holding arms is inserted into the media, the workpiece attached to any one of the other workpiece holding arms is Since the attached workpiece protrudes above the media or barrel tank, workpiece polishing and attachment/detachment can be performed in parallel, resulting in shorter idle time and improved machining efficiency. Since there is no need for a lifting mechanism for inserting the device into the media, the overall structure of the device can be made simple and inexpensive. Further, in this invention, since the inner peripheral surface of the barrel tank is spherical and the barrel tank rotates around the vertical axis, the media stored inside the barrel tank is moved inside the barrel tank by the action of centrifugal force and gravity. Since the depth is almost uniform with respect to the circumferential surface, and the rotating shaft is placed horizontally at a position that almost coincides with the center of curvature of the inner circumferential surface of the barrel tank, the resistance force of the media against the work holding arm is reduced. In addition to being smaller, uniform polishing can be performed.

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view showing an embodiment of the present invention, in which a barrel tank 1 has a hemispherical base 1a.
and an annular body 1b with a spherical inner circumferential surface attached to its upper opening, forming a truncated spherical body with an upward opening. The shaft 2 is attached to the machine frame 3 on the support plate 4.
It is rotatably supported with respect to the machine frame 3 by fitting it into a bearing 5 attached via a .
Further, the drive shaft 2 is connected to a motor 6 attached to the lower part of the machine frame 3 through pulleys 7 and 8 and a belt 9.
Therefore, the barrel tank 1 is rotatably driven in a fixed direction by the motor 6.

A rotating shaft 1 is located at the center of curvature of the barrel tank 1.
0 is arranged horizontally, and a plurality of (eight in FIG. 1) work holding arms 11a, .
1h are attached radially, and the tip ends of these work holding arms 11a, . Here, the structure for supporting the rotating shaft 10 will be explained. The rotating shaft 10 is rotatably attached to one end of a power transmission box 13, and the power transmission box 13 is connected to the top opening of the barrel tank 1. The support plate 14 extends obliquely upward from the support plate 15, and the other end thereof is fixed to the upper end of the support column 14 attached to the machine frame 3 via a support plate 15. A motor 16 and a speed reducer 17 are provided at the upper end of the support column 14, and the speed reducer 17 and the rotating shaft 10 are connected to each other by a transmission mechanism 18 including a belt provided inside the power transmission box 13. are connected together.

Also, to explain the workpiece mounting parts 12a,...12h, these workpiece mounting parts 12a...
12h has the same structure, and as shown in FIG.
is fitted into the L-shaped fitting 19 from its tip side.

Note that the reference numeral 20 in FIG. 1 is a cover, which has an opening having approximately the same diameter as the upper end opening of the barrel tank 1, and is attached to the machine frame 3 so as to cover the upper end side of the barrel tank 1.
It is attached to the upper end of the

Next, a polishing operation using the barrel device configured as described above will be explained. First, a predetermined amount of media 21 is placed in the barrel tank 1, and the motor 6 is started to rotate the barrel tank 1, for example, in the direction indicated by arrow A in FIG. Then, the media 21 is pushed toward the inner circumferential surface of the barrel tank 1 by the centrifugal force, and as a result, the media 21 becomes depressed in the center so that its surface surface almost forms a paraboloid, and the media 21 is pushed toward the inner peripheral surface of the barrel tank 1. Rotates with 1. As a result, the depth of the media 21 becomes substantially uniform because the inner peripheral surface of the barrel tank 1 is spherical. In this state, if the rotating shaft 10 is rotated by the motor 16, for example, in the direction indicated by arrow B in FIG.
The tip portions, that is, the workpiece mounting portions 12a, .
1, and then rises to protrude above the barrel tank 1. Therefore, the workpiece mounting portion 12a,
...While the workpiece W attached to 12h is passing through the media 21, the media 21 is in the barrel tank 1.
Polishing occurs due to the relative speed difference caused by rotating with the metal. In this case, the media 21 acts on the work W attached to the work mounting portions at positions 12c and 12d in FIG. 1 from the direction shown by arrow C in FIG. Since the media 21 acts on the workpiece W attached to the workpiece mounting portion at the position indicated by 12g from the direction shown by the arrow D in FIG.
It will be polished by the action of 1. Therefore, the workpiece W is attached to the workpiece mounting portions 12a,...12h.
On the other hand, as shown in FIGS. 3 and 4, combined with the fact that it is loosely fitted, the entire surface is evenly polished. Note that the workpiece W attached to the workpiece mounting portion at the position indicated by reference numeral 12e in FIG.
There is almost no abrasive action here.

Further, the depth of the media 21 is substantially uniform as described above, and the workpiece holding arms 11a,...11h
Since the rotating shaft 10 with attached workpiece holding arms 11a, . . . is located at the center of curvature inside the barrel tank 1,
11h does not penetrate particularly deeply into the media 21, and therefore the workpiece holding arms 11a,...11
Since the resistance force against h is reduced, its deformation is prevented, and its rotational driving force can be reduced.

By the way, in the above-mentioned barrel device, as is clear from the configuration, each workpiece mounting portion 12
a, . The workpiece W can be attached to and detached from the workpiece mounting section,
During the attachment/detachment operation, other workpieces W (workpieces attached to the workpiece mounting portions indicated by reference numerals 12c, . . . 12g in FIG. 1) are subjected to the polishing action.
Therefore, in the above-mentioned barrel device, the workpieces W attached to the workpiece mounting portions 12a, . , machining efficiency can be increased more than ever before.

In addition, a fixed position indexing mechanism such as a Geneva gear is provided in the drive mechanism such as the motor 16 and the speed reducer 17 for rotating the workpiece holding arms 11a,...11h, so that the workpiece mounting portions 12a,...12h are always kept at a constant position. If the work W is stopped at a certain position, the attachment and detachment of the workpiece W can be easily automated.

Furthermore, in the barrel device described above, since the work W is polished while passing through the medium 21,
The workpiece holding arms 11a,...11h can be rotated slowly to lengthen the time it takes for the workpiece W to pass through the media 21, or the workpiece W can be moved through the media 21 many times.
Of course, if the workpiece W is inserted and passed through, more of the workpiece W can be polished. Furthermore, in order to prolong the time for the work W to pass through the medium 21, the annular body 1 forming the upper end of the barrel tank 1 is
By increasing the height of b, the depth of the barrel tank 1 is made deeper, the amount of media 21 is increased, and the rotation speed of the barrel tank 1 is increased, thereby reducing the media layer formed in the barrel tank 1. You can make it deeper.

Furthermore, since the degree of polishing of the workpiece W depends on the relative speed difference between the workpiece W and the media 21, in the above barrel device, the barrel tank 1 is rotated at high speed,
Alternatively, if the workpiece holding arms 11a, .

Furthermore, in the above-mentioned barrel device, since the workpiece W moves across the media flow, an agitation force acts on the media 21, and as a result, media grains that have been worn to some extent and media grains that have not yet been worn mix. In addition, the entire media 21 is always homogenized, and therefore a stable barrel-polished finished surface can always be obtained.

Note that in this invention, the workpiece mounting section 12
a, . . . 12h may be on the same plane as the workpiece holding arms 11a, . . . 11h. Furthermore, if necessary, a stopper mechanism for preventing the workpiece from being lifted off the media may be added to the workpiece mounting portion without diminishing the effects of the present invention.

As is clear from the above description, according to the vertical barrel device of the present invention, a plurality of workpiece holding arms are attached radially to the horizontal rotating shaft, and the workpiece is held by loosely fitting into the tip of each workpiece holding arm. By providing a workpiece mounting section and rotating the workpiece holding arm together with the horizontal rotating shaft, the workpiece mounted on the workpiece mounting section is made to pass through the medium rotating together with the barrel tank having a spherical inner circumferential surface. The workpiece can be inserted into the media simply by rotating the holding arm together with the horizontal rotation axis.Therefore, there is no need for a lifting mechanism like in conventional equipment, making the overall equipment configuration simple and inexpensive. can be taken as a thing. Further, in the vertical barrel device of the present invention, at the same time as one of the workpiece mounting portions protrudes above the media or above the barrel tank, one of the other workpiece mounting portions enters into the media. The attachment and detachment of the workpiece and the polishing can be performed in parallel, and the workpiece attached to the workpiece mounting part can be immediately sent to the polishing process due to the rotating workpiece holding arm. According to the method, the so-called idle time that is not directly used for polishing is shortened, and processing efficiency can be improved more than ever before. Furthermore, in the vertical barrel device of this invention,
Since the workpiece moves across the media stream, the media can be stirred and mixed, so that the media is always homogenized and a stable barrel-polished finish can always be obtained. Furthermore,
If you move the workpiece so that it passes through the center of rotation of the media that rotates with the barrel tank, the media will act on both the front and back sides of the workpiece, so you can move the entire workpiece without rotating the workpiece. Can be polished evenly. In this invention, the inner peripheral surface of the barrel tank is made spherical and the barrel tank is rotated around the vertical axis, so the depth of the media through which the workpiece passes is almost uniform, and therefore the degree of polishing is uniform. In addition, since the workpiece holding arm does not penetrate particularly deeply into the media, the resistance applied to the workpiece holding arm can be reduced and deformation can be prevented.
The driving force for rotation can be reduced.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, FIG. 2 is a perspective view showing one of the workpiece mounting parts, and FIGS. 3 and 4 are diagrams for explaining the direction in which the media acts on the workpiece. FIG. 1... Barrel tank, 10... Rotating shaft, 11a,...
11h...Work holding arm, 12a,...12h...
Work attachment part, 21...media, W...work.

Claims (1)

[Claims] 1. A barrel tank whose top is open and whose inner circumferential surface is approximately spherical and which is driven to rotate about a vertical line passing through the center, and a barrel that is horizontally positioned within the barrel tank at a position that approximately coincides with the center of curvature of the inner circumferential surface. A rotating shaft is arranged, a plurality of work holding arms are attached radially to the rotating shaft, and the work holding arm is formed at the tip of the work holding arm so as to pass through the medium contained in the barrel tank and above the medium. and a workpiece mounting part for holding the workpiece in a loosely fitted state, and the workpiece mounted on the workpiece mounting part is configured to pass through the medium and above the medium by rotating the rotating shaft. Vertical barrel device.