JP7220624B2 - Mask jig used for centrifugal barrel polishing and barrel polishing system - Google Patents

Description

The present invention relates to a mask jig used for centrifugal barrel polishing and a barrel polishing system.

2. Description of the Related Art Conventionally, as a centrifugal barrel finishing machine for polishing a work, one having a barrel tank as disclosed in Patent Documents 1 to 3, for example, is known. In such a centrifugal barrel finishing machine, the workpiece and media (abrasive grains) such as abrasives and polishing compounds are placed inside the barrel tank, and rotated at high speed to apply centrifugal force to the workpiece and media, causing the media to Polish while rubbing the surface of the workpiece.

Since there are many cases where the workpiece has a non-polished surface, a mask jig 100 made of resin or the like as shown in FIGS. is attached to the workpiece 101. The mask jig 100 has a first mask portion 102 and a second mask portion 103 that cover the work non-polishing surfaces 101 a and 101 b located at both ends of the work 101 . The first mask portion 102 and the second mask portion 103 each have a substantially rectangular shape in plan view, and are connected by a connecting member 104 in a state in which the work polishing surface 101c is exposed and the work 101 is sandwiched therebetween.

Registered Utility Model No. 3042214 Japanese Utility Model Laid-Open No. 4-92764 Japanese Utility Model Laid-Open No. 63-41459

However, the conventional centrifugal barrel polishing as described in Patent Document 1 has the following problems.
That is, in the conventional mask jig mounted on the work, the fluidity of the media 106 on the work polishing surface 101c shown in FIG. Since the rotatability of the workpiece 101 in the bath 105 is deteriorated and the polishing time is lengthened, there is room for improvement in this respect.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and is a centrifugal barrel polishing that can improve the rotation of a workpiece in a barrel tank, shorten the polishing time, and perform polishing efficiently. It is an object of the present invention to provide a mask jig and a barrel polishing system used for.

In order to achieve the above object, a mask jig used for centrifugal barrel polishing according to one aspect of the present invention is mounted so as to cover the non-polished surfaces of a work having non-polished surfaces on both ends of a work shaft. A mask jig used for centrifugal barrel polishing in which a centrifugal force is applied together with the work in a barrel tank of the machine, the mask jig comprising a pair of mask portions held so as to cover the non-polished surface of the work, and the pair of mask portions. and a disk-shaped rotation auxiliary plate arranged on the side opposite to the holding portion attached to the work and having the disk center axis directed in the work axial direction.

A barrel polishing system according to another aspect of the present invention is characterized in that the workpiece with the mask jig described above is put into a barrel tank of a centrifugal barrel finishing machine to apply centrifugal force.

According to the mask jig and the barrel polishing system for use in centrifugal barrel polishing according to the above aspect, since the mask portion is mounted while covering the non-polished surfaces at both ends of the work, the work is placed in the barrel tank of the centrifugal barrel finishing machine. By centrifuging at , only the polishing surface of the workpiece can be efficiently polished. Since the mask jig is provided with auxiliary rotation plates at both ends of the jig with the mask portion attached to the workpiece, it is possible to prevent the fluidity of the media from being hindered by the auxiliary rotation plates. can. In other words, by providing the rotation auxiliary plate, it is possible to improve the rotational stability of the work, which is to facilitate the rotation of the work around the disk center axis in the barrel tank. Therefore, the media in the barrel tank can be slid efficiently against the polishing surface of the work, and the media sliding efficiency is improved, so that the work polishing time can be shortened.
Especially when the workpiece has a concave side surface, the polishing time for the concave side can be effectively shortened. Therefore, with the mask jig according to this aspect, it is possible to suppress the problem that the roughness is uneven due to the difference in the polishing rate between the convex side and the concave side of the workpiece.

In the mask jig used for centrifugal barrel polishing, the mask portion has a tapered surface that gradually becomes thinner from the rotation auxiliary plate side toward the holding portion side in the direction of the mask axis coaxial with the disk center axis. is preferably formed.

According to such a configuration, by reducing the level difference between the polishing surface of the work and the side surface of the mask portion, the media can easily flow into the work, and the fluidity of the media with respect to the polishing surface accompanying the provision of the mask jig is reduced. Inhibition can be suppressed.

Further, in the mask jig used for centrifugal barrel polishing, the mask portion may be configured so that the mask portion gradually becomes thinner as it separates from the mask axis when viewed from the direction of the mask axis coaxial with the disk center axis.

According to such a configuration, it is possible to improve the fluidity of the medium around the side surface of the mask portion in the vicinity of the holding portion on which the work is mounted.

Further, in the mask jig used for centrifugal barrel polishing, it is preferable that the auxiliary rotation plate has a first surface roughness of the outer peripheral surface larger than a second surface roughness of the plate surface perpendicular to the central axis of the disk.

In this case, the workpiece has a shape that allows it to rotate more efficiently around the central axis of the disk in the barrel tank, and the rotation stability of the workpiece can be further enhanced.

Further, in the mask jig used for the centrifugal barrel polishing, it is preferable that unevenness is formed on the outer peripheral surface of the auxiliary rotation plate.

With such a configuration, it is possible to provide frictional resistance due to rotation on the contact surface between the auxiliary rotation plate and the inner wall of the barrel tank, and to reduce rotational slip caused by the auxiliary rotation plate. It is possible to increase the rotatability of the mounted work.

Further, in the mask jig used for the centrifugal barrel polishing, the work to which the mask portion is attached has a first uneven surface formed on a side surface facing a direction orthogonal to the work axis, and the pair of mask portions is formed on the side surface facing the direction perpendicular to the work axis. A media flow suppressing member is provided at a position spaced parallel to the work between them, and the media flow suppressing member is bilaterally symmetrical with the first uneven surface of the work when viewed from the axial direction of the work. It is preferable that the second uneven surface is formed.

According to such a configuration, when using the work having the first uneven surface formed on the side surface facing in the direction perpendicular to the work axis, by providing the media flow suppression member that is symmetrical with respect to the work, the barrel It is possible to equalize the flow speed of the media flowing on the concave side and the convex side of the work in the tank. Therefore, the polishing speed on the concave surface side and the convex surface side of the work becomes equal, and it is possible to suppress uneven roughness due to polishing of the concave surface and the convex surface of the work.
In the present invention, it is possible to prevent the polishing time from becoming long due to a decrease in the polishing speed of the concave surface due to the difference in media fluidity between the convex surface and the concave surface of the workpiece. Further, for example, it is possible to prevent the conventional problem of losing shape due to an increase in polishing thickness reduction amount of the convex surface caused by polishing for a long time in order to make the roughness of the concave surface equal to that of the convex surface.

Further, in the barrel polishing system described above, it is preferable that the inner wall of the barrel tank is formed with unevenness.

With such a configuration, it is possible to provide frictional resistance due to rotation on the contact surface between the auxiliary rotation plate and the inner wall of the barrel tank, and to reduce rotational slip caused by the auxiliary rotation plate. It is possible to increase the rotatability of the mounted work.

According to the mask jig used for centrifugal barrel polishing and the barrel polishing system of the present invention, the rotatability of the workpiece in the barrel tank can be improved, the polishing time can be shortened, and the polishing can be performed efficiently. can.

1 is a side view showing the configuration of a mask jig holding a work according to a first embodiment of the present invention; FIG. FIG. 2 is a top view of the first mask portion of the mask jig shown in FIG. 1 as seen from the axial direction of the work; FIG. 2 is a view taken along the line AA shown in FIG. 1 and is a side view of the mask jig in FIG. 1 as seen from the side; FIG. 2 is a cross-sectional view of the workpiece shown in FIG. 1 put into a barrel tank of a centrifugal barrel finishing machine; 5 is a side sectional view of the barrel tank shown in FIG. 4; FIG. It is a figure which shows an example of a polishing effect, Comprising: It is a figure which shows the relationship between polishing time and surface roughness. FIG. 3 is a side view showing the configuration of a mask jig holding a work according to a second embodiment, corresponding to FIG. 1; FIG. 8 is a top view of the first mask part of the mask jig shown in FIG. 7 as seen from the axial direction of the work, and is a view corresponding to FIG. 2 ; FIG. 11 is an enlarged view of a main portion for explaining holding means for a mask portion according to a second embodiment; FIG. 8 is a cross-sectional view of the work shown in FIG. 7 put into the barrel tank of the centrifugal barrel finishing machine, corresponding to FIG. 4 ; (a), (b) is a principal part side view which shows the other shape of the outer peripheral surface of the rotation auxiliary plate by a modification. FIG. 11 is a side view showing the configuration of a mask jig holding a workpiece according to a third embodiment, corresponding to FIG. 1; FIG. 13 is a top view of the first mask part of the mask jig as seen from the axial direction of the work in the BB line cross-sectional view shown in FIG. 12, and corresponds to FIGS. 2 and 8; FIG. 5 is a diagram for explaining a state of media flowing around a work and a media flow suppressing member; It is a figure which shows the conventional mask jig, (a) is a side view, (b) is a top view. (a), (b) is a figure which shows the state of the workpiece|work in the barrel tank of the conventional centrifugal barrel finishing machine.

A mask jig used for centrifugal barrel polishing and a barrel polishing system according to an embodiment of the present invention will be described below with reference to the drawings. This embodiment shows one aspect of the present invention, does not limit the present invention, and can be arbitrarily changed within the scope of the technical idea of the present invention.

(First embodiment)
The mask jig 1 according to the present embodiment shown in FIGS. It is a jig for covering 2b. That is, the mask jig 1 is mounted so as to cover the non-polishing surfaces 2a and 2b of the work 2 having the non-polishing surfaces 2a and 2b on both ends of the work shaft O, and the work is placed in the barrel tank 31 of the centrifugal barrel finishing machine 3. 2 is used for centrifugal barrel polishing in which centrifugal rotation is imparted.

A barrel polishing system 10 according to the present embodiment shown in FIGS. 4 and 5 is a system in which a workpiece 2 with a mask jig 1 mounted thereon is put into a barrel tank 31 of a centrifugal barrel finishing machine 3 and rotated centrifugally.

Here, the workpiece 2 according to this embodiment is intended for a steam turbine blade made of stainless steel. That is, as shown in FIGS. 1 and 3, the workpiece 2 includes a blade body 21 having a concave surface or a convex surface (first uneven surface) formed on a side surface facing a direction perpendicular to the workpiece axis O, and an axis of the blade body 21. It has a shroud 22 provided at one end in the direction of the work axis O, and a base portion 23 provided at the other end in the direction of the work axis O. As shown in FIG. In this embodiment, the direction of the work axis O is defined as the vertical direction, the shroud 22 side is defined as the upper side, and the base portion 23 side is defined as the lower side.
In the mask jig 1, the mask axis that is coaxial with the work axis O when mounted on the work 2 is denoted by C1.

As shown in FIG. 2, the wing main body 21 is located on the opposite side of the front edge 21a, the rear edge 21b, the concave ventral side 21c, and the ventral side 21c in a cross-sectional view, and has a convex surface. 21 d of back sides.

As shown in FIGS. 1 and 3, the mask jig 1 includes a pair of mask portions 11 (11A, 11B) held so as to cover the non-polished surfaces 2a, 2b of the workpiece 2, and a pair of mask portions 11A, 11B. , a disc-shaped rotation auxiliary plate 12 arranged on the side opposite to the holding portions 111 and 112 attached to the work 2 and having the disc central axis C2 directed in the direction of the work axis O, a pair of mask portions 11A, A pair of connecting shaft members 13 for connecting 11B are provided.

A recessed first holding portion 111 for holding the shroud 22 of the workpiece 2 is formed on the lower surface 11c of the first mask portion 11A, which is one of the pair of mask portions 11A and 11B. A concave second holding portion 112 for holding the base portion 23 of the workpiece 2 is formed on the upper surface 11d of the other second mask portion 11B.
The mask portions 11A and 11B extend in one direction when viewed from the direction of the work axis O, and have a quadrangular shape when viewed from the side in the extending direction X1 (see FIG. 2). The mask portions 11A and 11B are formed with first insertion holes 11a penetrating in the work axis O direction on both sides in the extending direction X1. The mask portions 11A and 11B are made of a member such as resin or urethane rubber.

The first mask portion 11A is formed with a tapered surface 11b that gradually becomes thinner from the rotation auxiliary plate 12 side toward the holding portion 111 side of the shroud 22 of the work 2 in the work axis O direction.
The second mask portion 11B is formed with a tapered surface 11b that gradually becomes thinner from an intermediate portion on the side of the rotation auxiliary plate 12 in the direction of the work axis O toward the holding portion 112 side of the base portion 23 of the work 2 .

The auxiliary rotation plate 12 is fixed to the mask portion 11, and is penetrated in the thickness direction by a pair of second insertion holes 12a arranged coaxially with a pair of first insertion holes 11a formed in the mask portion 11. is provided. The auxiliary rotation plate 12 is set so that the first surface roughness S1 of the outer peripheral surface 12d is larger than the second surface roughness S2 of the plate surfaces (the outer surface 12b and the inner surface 12c) perpendicular to the disk center axis C2. The auxiliary rotation plate 12 is made of a member such as resin or urethane rubber.

The connecting shaft member 13 is composed of a bolt 131 and a nut 132 screwed onto the bolt 131 . The bolt of the connecting shaft member 13 is provided so as to be able to pass through the first insertion hole 11a and the second insertion hole 12a. The length of the bolt 131 is such that it is inserted through the first insertion holes 11a of the pair of mask portions 11A and 11B holding the work 2 and the second insertion hole 12a of the rotation auxiliary plate 12 from one side, and the nut 132 is tightened from the other side. It is set to the length possible.

The pair of mask portions 11A and 11B and the auxiliary rotation plate 12 are connected to the first insertion hole 11a of the mask portions 11A and 11B and the second insertion hole 11 of the auxiliary rotation plate 12 while the work 2 is held by the pair of mask portions 11A and 11B. A bolt 131 of the connecting shaft member 13 is passed through the insertion hole 12a and fixed by tightening with a nut 132, and the work 2 is held by the pair of mask portions 11A and 11B.

As shown in FIG. 4, the centrifugal barrel finishing machine 3 has a barrel tank 31 with a hexagonal cross section. The barrel tank 31 rotates around a barrel rotating shaft (not shown). Here, FIGS. 4 and 5 show a state in which the workpiece 2 and the medium 4 held by the mask jig 1 are put into the barrel tank 31. As shown in FIG. As the media 4, an abrasive material or a polishing compound is used.
In the centrifugal barrel finishing machine 3, the entire barrel tub 31 revolves in the direction of arrow E shown in FIG. 4 and rotates in the direction of arrow F around the barrel rotation axis. As a result, a centrifugal force is applied to the work 2 and the media 4, and when the work 2 passes through the media 4, the polishing surface 2c of the work 2 is rubbed and polished.

Next, the operation of the mask jig used in the above-described centrifugal barrel polishing and the barrel polishing system will be specifically described with reference to the drawings.
In the mask jig 1 and the barrel polishing system 10 used for centrifugal barrel polishing according to the present embodiment, as shown in FIGS. Since the mask parts 11A and 11B are attached while covering the workpiece 2, only the polishing surface 2c of the workpiece 2 can be efficiently polished by centrifuging the workpiece 2 in the barrel tank 31 of the centrifugal barrel finishing machine 3. . Since the mask jig 1 is provided with auxiliary rotation plates 12 at both ends of the jig when the mask portions 11A and 11B are attached to the workpiece 2, the auxiliary rotation plates 12 impede fluidity of the medium. can be suppressed.

In other words, in this embodiment, by providing the rotation auxiliary plate 12, it is possible to improve the rotation stability of the workpiece 2, which makes it easier for the workpiece 2 to rotate around the disk central axis C2 in the barrel tank 31. Therefore, the media 4 in the barrel tank 31 can be efficiently slid on the polishing surface 2c of the work 2, and the media sliding efficiency is improved, so that the polishing time of the work 2 can be shortened. .
Especially when the workpiece 2 has a concave side surface 21c formed on the side surface, the polishing time for the concave side can be effectively shortened. Therefore, in the present embodiment, it is possible to suppress unevenness in roughness due to a difference in polishing rate between the convex side (back side 21d) and concave side (ventral side 21c) of the workpiece 2.

Further, in the mask jig 1 according to the present embodiment, the mask portions 11A and 11B are formed with a tapered surface 11b that gradually becomes thinner from the auxiliary rotation plate 12 side toward the holding portion side in the direction of the mask axis C1. By reducing the step between the polishing surface 2c and the side surface of the mask portion 11, the media 4 can easily flow into the workpiece 2, and the fluidity of the media with respect to the polishing surface 2c accompanying the provision of the mask jig 1 is hindered. can be suppressed.

Further, in the present embodiment, the auxiliary rotation plate 12 has a first surface roughness S1 of the outer peripheral surface 12d that is greater than a second surface roughness S2 of the plate surfaces (the outer surface 12b and the inner surface 12c) perpendicular to the disk central axis C2. Because of the large size, the work 2 can be efficiently rotated around the disk center axis C2 in the barrel tank 31, and the rotation stability of the work 2 can be further enhanced.

FIG. 6 shows an example showing the relationship between the polishing time (min) and the surface roughness Ra (μm) when the workpiece 2 is polished using the barrel polishing system described above. Here, a comparative example using a conventional cylindrical mask jig and an example using the mask jig 1 according to the above-described embodiment with the auxiliary rotation plate 12 attached were polished under the same polishing conditions. The side (abdominal surface 21c shown in FIG. 2) was polished, and the polishing time when the surface roughness reached a predetermined roughness (0.04 μm on the mirror surface Ra) was compared.

As shown in FIG. 6, the polishing time is 300 minutes in the example and 600 minutes in the comparative example, and the example can realize a time reduction of approximately 300 minutes (5 hours) compared to the comparative example. It was confirmed that the jig 1 enabled efficient polishing in a short period of time.

With the mask jig and the barrel polishing system used for centrifugal barrel polishing according to the present embodiment described above, the rotatability of the work 2 in the barrel tank 31 can be increased, the polishing time can be shortened, and the polishing can be efficiently performed. It can be carried out.

Next, a mask jig used for centrifugal barrel polishing and a barrel polishing system according to another embodiment will be described. Components having the same functions as those of the components of the first embodiment described above are denoted by the same reference numerals, and detailed description thereof will be omitted to avoid duplication of description.

(Second embodiment)
As shown in FIGS. 7 and 8, in the mask jig 1A according to the second embodiment, the shape of the mask portion 11 of the first embodiment is changed, and a pair of mask portions 11A and 11B are used as holding means for the workpiece 2. The connecting shaft member 13 (see FIG. 3) is omitted and another holding means is applied.
The mask portions 11A and 11B have a rhombus shape in top view that gradually tapers away from the mask axis C1 when viewed from the direction of the mask axis C1 coaxial with the disk center axis C2. The mask portions 11A and 11B have the same cross-sectional shape along the mask axis C1 and are integrally formed with the auxiliary rotation plate 12. As shown in FIG.

As shown in FIG. 7, screw holes 113 penetrating through the holding portions 111 and 112 are formed in the side surfaces of the respective mask portions 11A and 11B. A screw hole 113 is provided at one location in the first mask portion 11A. The second mask portion 11B is provided with screw holes 113 at two vertically spaced locations. Wedge-shaped screws 114 are driven into these screw holes 113 as shown in FIG. , 2b, the work 2 is fixed so as not to come off from the holding portions 111 and 112. As shown in FIG.

As shown in FIG. 10, the auxiliary rotation plate 12 has a triangular mountain-shaped unevenness 121 formed on the outer peripheral surface 12d. The unevenness 121 of the auxiliary rotation plate 12 can be formed by applying surface treatment such as WC cermet thermal spray coating.
The inner wall 31a of the barrel tank 31 of the centrifugal barrel finishing machine 3 is also formed with triangular mountain-shaped irregularities 311. As shown in FIG. As the unevenness 311 of the inner wall 31 a of the barrel tank 31 , the unevenness 311 can be processed in the lining rubber material such as urethane of the barrel tank 31 .

In the second embodiment described above, it is possible to improve the fluidity of the media around the side surfaces of the mask portion 11 near the holding portions 111 and 112 on which the work 2 is mounted.
In addition, in the second embodiment, since the connecting shaft member 13 (see FIG. 1) as in the above-described first embodiment is omitted, the number of members that hinder the fluidity of the media 4 is further reduced, and the work can be carried out more efficiently. 2 can be polished.

Furthermore, in the second embodiment, since the unevenness 311 is formed on the outer peripheral surface 12d of the auxiliary rotation plate 12 and the inner wall 31a of the barrel tank 31, the contact surface between the auxiliary rotation plate 12 and the inner wall 31a of the barrel tank 31 Frictional resistance associated with rotation can be provided, and rotational slip caused by the auxiliary rotation plate 12 can be reduced, so that the rotatability of the work 2 on which the mask jig 1 is mounted can be enhanced. In addition, although the unevenness|corrugation 121 and 311 are formed in both the rotation auxiliary|assistant board 12 and the barrel tank 31, either one may be sufficient. Further, the unevenness 121, 311 may be formed by covering with a gripping member having unevenness.

The uneven shape formed on the outer peripheral surface 12d of the auxiliary rotation plate 12 and the inner wall 31a of the barrel tank 31 is not limited to the triangular mountain-shaped unevenness 121, 311 described above. For example, it may be rectangular unevenness 121A, 311A as shown in FIG. 11A, or curved unevenness 121B, 311B as shown in FIG. 11B.

(Third Embodiment)
As shown in FIGS. 12 and 13, in the mask jig 1B according to the third embodiment, the pair of mask portions 11A and 11B is spaced parallel to the work 2 in the direction orthogonal to the work axis O. A media flow suppressing member 14 is provided at a position where the media flow is suppressed. The media flow suppressing member 14 is spaced apart from the back side surface 21d (see FIG. 13) of the work 2, extends vertically along the work axis O, and has an upper end 14c and a lower end 14d each forming the first mask portion 11A. and the upper surface 11d of the second mask portion 11B.
A convex curved surface 14a and a concave curved surface 14b (second uneven surfaces) are formed on the media flow suppression member 14 so as to be bilaterally symmetrical with the ventral side surface 21c and the back side surface 21d of the workpiece 2 when viewed from the direction of the workpiece axis O. . The convex curved surface 14 a of the media flow suppression member 14 is arranged facing the back surface 21 d of the workpiece 2 .

According to such a configuration, when using the work 2 having the ventral side 21c and the dorsal side 21d formed on the sides facing in the direction perpendicular to the work axis O, the left and right sides of the work 2 as viewed from the work axis O direction. By providing the symmetrical media flow suppression member 14, as shown in FIG. V2 can be made equivalent. Therefore, the polishing speeds of the ventral side 21c and the dorsal side 21d of the work 2 are the same, and unevenness in the grinding roughness of the ventral side 21c and the dorsal side 21d of the work 2 can be suppressed.

In this embodiment, it is possible to prevent the polishing rate from decreasing on the ventral side 21c due to the difference in media fluidity between the ventral side 21c and the dorsal side 21d of the work 2 and the polishing time from becoming long. Furthermore, for example, to prevent the conventional problem that the back side 21d loses its shape due to an increase in grinding thinning amount of the back side 21d caused by polishing for a long time in order to make the roughness of the ventral side 21c equal to that of the convex back side 21d. can be done.

Although the embodiment of the mask jig used for centrifugal barrel polishing and the barrel polishing system according to the present invention has been described above, the present invention is not limited to the above-described embodiments, and can be modified as appropriate without departing from the scope of the invention. It is possible.

For example, in the present embodiment, a steam turbine blade is used as the workpiece 2, but it is also possible to apply workpieces of other members and shapes. In short, any work that has non-polished surfaces at both ends of the work axis of the work and needs to be polished while covering the non-polished surfaces with the mask portion may be used.

In addition, in the first embodiment, the mask portions 11A and 11B are formed with tapered surfaces 11b that gradually become thinner from the auxiliary rotation plate 12 side toward the holding portions 111 and 112 in the direction of the mask axis C1. , the tapered surface 11b may be omitted.

Furthermore, in the embodiment, the outer peripheral surface 12d of the auxiliary rotation plate 12 is set to have a larger surface roughness than the plate surfaces (the outer surface 12b and the inner surface 12c) perpendicular to the central axis of the disc. not limited.
Further, it is not limited to forming the irregularities 121 on the outer peripheral surface 12d of the auxiliary rotation plate 12, and the irregularities 121 may be omitted.

Furthermore, it is not limited to forming the unevenness 311 on the inner wall 31a of the barrel tank 31, and the unevenness 121 can be omitted.

In addition, it is possible to appropriately replace the components in the above-described embodiments with well-known components without departing from the scope of the present invention, and the above-described embodiments may be combined as appropriate.

Reference Signs List 1, 1A, 1B mask jig 2 workpiece 2a, 2b non-polishing surface 2c polishing surface 3 centrifugal barrel polishing machine 4 media 10 barrel polishing system 11, 11A, 11B mask part 11b tapered surface 12 rotation auxiliary plate 12d outer peripheral surface 13 connecting shaft Member 14 Media flow suppression member 14a Convex curved surface (second uneven surface)
14b Concave curved surface (second uneven surface)
21 wing main body 21c ventral side (first uneven surface)
21d dorsal side (first uneven surface)
31 Barrel tank 31a Inner wall 111, 112 Holding part 121, 311 Unevenness O Work axis C1 Mask axis C2 Disk central axis

Claims (8)

A mask jig used for centrifugal barrel polishing, which is mounted so as to cover the non-polished surfaces of a work shaft having non-polished surfaces on both ends of the work shaft, and in which a centrifugal force is applied together with the work in a barrel tank of a centrifugal barrel finishing machine. There is
a pair of mask portions held so as to cover the non-polished surface of the work;
a disk-shaped rotation auxiliary plate disposed on the opposite side of the pair of mask portions from the holding portion attached to the work, and having the disk center axis directed in the axial direction of the work;
A mask jig used for centrifugal barrel polishing. 2. The mask jig according to claim 1, wherein the mask portion is formed with a tapered surface that tapers gradually from the rotation auxiliary plate side toward the holding portion side in a mask axial direction coaxial with the disk center axis. . 3. The mask jig according to claim 1, wherein the mask portion gradually becomes thinner with increasing distance from the mask axis when viewed from the direction of the mask axis coaxial with the disk center axis. 4. The mask jig according to any one of claims 1 to 3, wherein the auxiliary rotation plate has a first surface roughness of the outer peripheral surface larger than a second surface roughness of the plate surface perpendicular to the central axis of the disk. 5. The mask jig according to any one of claims 1 to 4, wherein unevenness is formed on an outer peripheral surface of said rotation assisting plate. The work to which the mask portion is attached has a first uneven surface formed on a side surface thereof facing in a direction orthogonal to the work axis,
A media flow suppression member is provided between the pair of mask portions at a position parallel to the work and spaced apart,
6. The medium flow suppression member according to any one of claims 1 to 5, wherein a second uneven surface that is bilaterally symmetrical with the first uneven surface of the workpiece when viewed from the axial direction of the workpiece is formed. mask jig. A barrel polishing system in which the workpiece having the mask jig according to any one of claims 1 to 6 is put into a barrel tank of a centrifugal barrel finishing machine to apply centrifugal force. 8. The barrel polishing system according to claim 7, wherein unevenness is formed on the inner wall of the barrel tank.

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