JPH0356864B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a barrel polishing jig used for barrel polishing a ring-shaped workpiece.

[Technical background of the invention and its problems]

Barrel polishing is a method for polishing a workpiece. In this barrel polishing process, the workpiece is placed in a barrel filled with media, and the media is moved by rotation of the barrel, vibration, centrifugal force, etc., and the moving media and the surface of the workpiece are Polishing is performed by contact with the

By the way, the entire small ring-shaped workpiece,
In other words, barrel polishing is also used when polishing the inner and outer surfaces. That is, the above-described polishing is performed by placing a large number of ring-shaped workpieces into media within the barrel.

However, simply putting the workpiece into the media at random and polishing it,
Although the media flows sufficiently on the outer surface of the workpiece, on the other hand, there is a problem in that not enough media enters the inner surface of the workpiece, resulting in insufficient polishing. This has resulted in the inconvenience that sufficient surface roughness cannot be obtained on the inner surface of the workpiece.

[Purpose of the invention]

This invention was made in view of the above circumstances, and its purpose is to provide a barrel polishing tool that can simultaneously finish the inner and outer surfaces of a ring-shaped workpiece to a desired surface roughness. It is to provide the ingredients.

[Summary of the invention]

The present invention provides a barrel polishing jig for holding a ring-shaped workpiece to be barrel-polished by a media, which includes a shaft member for loosely inserting and holding the workpiece, and a shaft member provided at both ends of the shaft member for holding the workpiece. The workpiece includes a regulating member that restricts the workpiece from coming off the shaft, and an inner polishing member that is provided on the outer surface of the shaft and polishes the inner surface of the workpiece in cooperation with the media. , it is possible to simultaneously finish the inner and outer surfaces of a ring-shaped workpiece to a desired surface roughness.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a barrel polishing apparatus in which the barrel polishing jig J of this embodiment is used. This barrel polishing device has a motor 7 connected to the lower part of a barrel 3 in which a media 2 is housed, and upper and lower balance weights 5 and 6 connected to both ends of an output shaft as a vibration generation source through a coil spring 4. It is constructed by providing a machine room 7a in which the equipment is housed. In this way, the media 2 inside the barrel 3 can be made to flow by the vibrations generated by the motor 7. On the other hand, the workpiece 9 shown in FIG.
For example, it is a mechanical part or decorative part made of a ring-shaped metal or ceramic member.

Next, the barrel polishing jig J is
As shown in the figure, there is a shaft 10 which is made of metal or plastic and has a cylindrical shape and has a diameter smaller than the inner diameter of the through hole 9a of the workpiece 9, and which can be freely attached and detached by screwing to both ends of the shaft 10. It consists of a pair of disc-shaped plates 11, 11 as regulating members attached to the. The total length of the shaft body 10 is set to a length according to the space inside the barrel 3,
The entire body can be housed within the barrel 3. Further, the outer diameter of the plate 11 is set larger than the inner diameter of the through hole 9a, and the shaft body 10
It is possible to prevent the workpiece 9 loosely inserted into the workpiece 9 from coming off. Furthermore, abrasive grains 12 are evenly coated on the outer peripheral surface of the shaft body 10.

Next, the operation of the barrel polishing jig J having the above configuration will be described.

First, one plate 11 is removed from the shaft 10, and the workpieces 9 are sequentially loosely inserted into the shaft 10. Thereafter, one plate 11 is attached to the shaft body 10 again. Then, when the shaft body 10 with the workpiece 9 loosely inserted therein is inserted into the barrel 3 and the motor 7 is started, the vibration generated by the rotation of the upper and lower balance weights 5 and 6 is transmitted to the barrel 3. , media 2... are made to flow, and barrel polishing is performed. Here, the flow state of the media 2 is not only that it flows on the outer surface of each workpiece 9 but also as a guide using the shaft body 10 into which the workpiece 9 is loosely inserted, as shown in FIG. , through hole 9a of workpiece 9...
Media 2... actively flows in and out. Then, the media 2 that has flowed into the through hole 9a polishes the inner surface of the workpiece 9 in cooperation with the abrasive grains 12 that are attached to the outer peripheral surface of the shaft body 10. Thereby, the inner surface of the workpiece 9, which is difficult to polish, can be reliably and quickly polished to the same surface roughness and gloss as the outer surface. Furthermore, after polishing is completed, by taking out the barrel polishing jig J from the barrel 3, a large number of workpieces 9 can be taken out at once without the need for troublesome sorting from the media 2. It is possible to shorten processing time.

In the above embodiment, the outer peripheral surface of the shaft body 10 is coated with abrasive grains 12, but as shown in FIG. ... may be distributed and provided protrudingly. In this case as well, the protrusions 13 and the media 2 flowing into the through holes 9a work together to polish the inner surface of the workpieces 9, so that the polishing function is enhanced and the same effects as in the embodiment described above are achieved.

Further, as shown in FIG. 5, a large number of grooves 14 having a V-shaped cross section may be closely carved on the outer surface of the shaft body 10. In this case as well, the protrusions between the grooves 14 and the media 2 flowing into the through holes 9a work together to polish the inner surface of the workpiece 9, so the polishing function is enhanced and the same effect as in the above embodiment is achieved. play.

Furthermore, as shown in FIG. 6, the barrel polishing jig J may be fixed to the wall 3a of the barrel 3 with screws or the like.

Similarly, as in the above embodiment, the barrel polishing jig of the present invention is not limited to the vibration type barrel polishing device, but can be installed in the barrel 3 of a rotating type barrel polishing device using centrifugal force as shown in FIG. The tool J may be accommodated or fixed.

〔Effect of the invention〕

In the barrel polishing jig of the present invention, an inner surface polishing member is provided on the outer peripheral surface of a cylindrical shaft into which a ring-shaped workpiece is loosely inserted, and polishes the inner surface of the workpiece in cooperation with the above-mentioned media. As a result, the inner surface of the workpiece, which is difficult to polish, can be reliably and simultaneously polished to the same surface roughness and gloss as the outer surface. Moreover, once the barrel polishing jig of this invention is removed from the barrel after polishing is completed, a large number of workpieces can be taken out at once without the need for troublesome media sorting, which significantly reduces machining time. Shortening is possible. Therefore, by combining these effects, it is possible to polish a ring-shaped workpiece with high precision and high efficiency.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a barrel polishing apparatus in which a barrel polishing jig according to an embodiment of the present invention is used;
The figure is a perspective view of a barrel polishing jig according to an embodiment of the present invention, FIG. 3 is a side sectional view of FIG. 2, and FIGS.
The figure is an explanatory diagram of another embodiment of the present invention. J: Barrel polishing jig, 2: Media, 3: Barrel, 9: Workpiece, 10: Shaft, 11: Plate (regulating member), 12: Abrasive grain (inner polishing member), 1
3: protrusion (inner surface polishing member), 14: groove (inner surface polishing member).

Claims (1)

[Claims] 1. A barrel polishing jig that holds a ring-shaped workpiece to be barrel-polished by a media,
a cylindrical shaft for loosely inserting and holding the workpiece; a regulating member removably provided at both ends of the shaft for regulating the workpiece from coming off the shaft; A barrel polishing jig comprising: an inner surface polishing member provided on an outer surface of the workpiece to polish the inner surface of the workpiece in cooperation with the media. 2. Claim 1, wherein the internal polishing member is abrasive grains fixed to the outer surface of the shaft body.
Barrel polishing jig as described in section. 3. The barrel polishing jig according to claim 1, wherein the inner surface polishing members are hemispherical protrusions distributed and protruding from the outer surface of the shaft body. 4. The barrel polishing jig according to claim 1, wherein the inner surface polishing member is a groove portion densely carved on the outer surface of the shaft body.