JPWO2012042681A1 - Polishing unit and polishing method using polishing unit - Google Patents

Abstract

The main body (11) and the lid (12) of the barrel tank (10) are compatible, and the lid (12) is fixed to the main body (11) of the barrel tank (10) and attached to the barrel tank case (20). A polishing unit that can reliably fix the barrel tank (10) is disclosed. The barrel tank (10) has a lid fixing member (14) that fixes the lid (12) to the main body (11). The barrel tank case (20) has a tray (21) for placing and holding the barrel tank (10), a barrel tank fixing member (22) for fixing the barrel tank (10) to the tray (21), and a barrel tank fixed. It includes a pair of guide portions (23) capable of moving the member (22) in the horizontal direction. The barrel tank fixing member (22) is arranged so as to be opposed to the tray (21) so as to be able to press the barrel tank (10) vertically downward, and is arranged to press the barrel tank (10). The convex member (22c) and the protruding member (22d) are used as positioning members for restricting the movement of the barrel tank fixing member (22) with respect to the guide portion (23) when the barrel tank fixing member (22) is mounted. Including.

Description

Cross-reference of related applications

  The present application claims Japanese patent application No. 2010-216294 (filing date: September 28, 2010), the benefit of the priority of the title “polishing unit” of the invention, the entire contents of the application by reference Is incorporated herein.

Detailed Description of the Invention

[Technical field]
The present invention relates to a polishing unit used in a centrifugal barrel polishing apparatus and a polishing method using a centrifugal barrel polishing apparatus equipped with the polishing unit.

Conventionally, a workpiece and polishing media are put into a barrel tank for deburring, rounding, gloss polishing, etc. of an object to be polished (work), and this barrel tank is rotated and revolved to flow the polishing media. A centrifugal barrel polishing apparatus that polishes a workpiece by using it is widely used.
A conventional polishing unit used in such a centrifugal barrel polishing apparatus is disclosed in Patent Document 1, for example.
FIG. 4 shows an example of a conventional polishing unit. The conventional polishing unit 100 includes a barrel tank 110 composed of a box-shaped main body 111 and a lid 112, and a barrel tank case 120 rotatably attached to a turret (revolution disk) not shown. In order to fix the barrel tank 110 to the barrel tank case 120, the operator manually operates the lever 122 of the fixing member 121 provided in the barrel tank case 120 to rotate the eccentric rod 123, thereby causing the cam 124 to move. The lid 112 is brought into contact with a shoulder 113 formed on the upper surface of the lid 112, and the lid 112 is strongly pressed against the main body 111 and fixed.

Japanese Patent Laid-Open No. 11-58214 (Shinto Blator Co., Ltd.)

In the conventional polishing unit 100 as described above, the barrel tank 110 does not include a means for fixing the lid 112 to the main body 111. Therefore, in order to generate a sufficient pressing force with the eccentric amount of the cam 124, the cam 124 is provided. And the shoulder 113 are required to have high accuracy. Accordingly, if the main body 111 and the lid 112 are not aligned with each other, the clearance may be out of a predetermined range. Therefore, the main body 111 and the lid 112 are not compatible with other lids and the main body, and the barrel tank 110 is attached and detached. There is a problem that cannot be performed efficiently. Further, since the magnitude of the pressing force and the direction in which the pressing force acts are determined by the eccentric amount of the cam 124 and the clearance between the cam 124 and the shoulder 113, the pressing force is controlled in a constant direction with a constant value. There is also a problem that it is difficult to do.
Also, when replacing the rubber lining on the inner surface of the barrel tank 110, the rubber forming the lining may be removed by heating, but if the main body 111 or the lid 112 or both of them are thermally strained at this time Since the clearance between the cam 124 and the shoulder 113 changes, the clearance needs to be corrected, and in some cases, at least one of the main body 111 and the lid 112 must be replaced.
In addition, as described above, the barrel tank 110 needs to be attached and detached for maintenance (for example, replacement of the barrel tank due to wear of the rubber lining) and for loading and unloading the workpiece and the polishing media with respect to the barrel tank 110. There is a need for weight reduction.

  Therefore, an object of the present invention is to provide compatibility between the main body and the lid of the barrel tank with respect to other lids and the main body, and to reliably fix the lid to the barrel tank main body and the barrel tank to the barrel tank case. It is possible to provide a polishing unit that is excellent in maintainability and to provide a polishing method using the polishing unit.

In order to achieve the above object, in one embodiment of the present invention, a polishing unit for use in a centrifugal barrel polishing apparatus is provided, which includes a main body portion for inserting a member to be polished and a medium, and sealing the main body portion. A barrel tank having a lid to
A barrel tank case having a tray for holding the barrel tank and a barrel tank fixing member for fixing the barrel tank to the tray; and a barrel tank case attached to a revolution disk of a centrifugal barrel polishing apparatus. Corresponds to the outer shape of the lid, and has a pressing member configured to be able to press the lid vertically downward.

According to this embodiment, the lid can be pressed vertically downward by the pressing member, and the lid can be fixed to the main body portion by an appropriate pressing force. Therefore, the barrel tank can be mounted regardless of the clearance between the barrel tank fixing member and the lid. It can be securely fixed to the barrel tank case.
In addition, since the pressing member corresponds to the outer shape of the lid, it is possible to prevent the pressing member and the lid from rattling and securely fix the lid to the main body.
Since the lid can be fixed to the main body portion in the same pressing state, it is not necessary to fix the combination of the main body portion and the lid, and a polishing unit compatible with the barrel tank main body and the lid can be obtained.

  In this case, the barrel tank fixing member is inserted into a pair of guide portions that guide the barrel tank fixing member, and is configured to be movable in a horizontal direction when the barrel tank is attached and detached. A positioning member that restricts the movement of the barrel tank fixing member with respect to the guide portion when the member is mounted at the fixed position of the barrel tank may be included.

According to such a configuration, the barrel tank fixing member is inserted into the pair of guide portions that guide the barrel tank fixing member and is configured to be movable in the horizontal direction when the barrel tank is attached or detached. The fixing member can be prevented from interfering with the attachment / detachment of the barrel tank, and the barrel tank can be attached / detached easily.
And when the barrel tank fixing member is mounted at the fixed position of the barrel tank, the movement of the barrel tank fixing member can be limited by the positioning member with reference to the guide portion, so the barrel tank is easily arranged at the fixed position. To prevent it from moving.

  The positioning member includes a convex member that restricts movement of the barrel tank fixing member in the mounting direction when the barrel tank fixing member is mounted at a fixed position of the barrel tank, and an outer side from the inside of the barrel tank fixing member. A projecting member biased in a projecting direction, and is configured to be retractable inside the barrel tank fixing member, and protrudes when the barrel tank fixing member is mounted at a fixed position of the barrel tank. And a protruding member that restricts movement of the barrel tank fixing member in the releasing direction.

In this case, when the barrel tank fixing member is mounted, the movement of the barrel tank fixing member in the mounting direction can be limited by the convex member, and the movement in the release direction can be limited by the protruding member. Thereby, a barrel tank can be easily arrange | positioned to a fixed position so that it may not move.
Since the projecting member is biased in a direction projecting outward from the inside of the positioning member, it is automatically projected by simply mounting the barrel tank fixing member at the fixed position of the barrel tank to limit the movement in the release direction. be able to.

  The polishing unit of the present invention includes an index plunger capable of positioning to a predetermined position, a lid pressing member that presses the lid against the main body portion via the index plunger by operating the index plunger, It is preferable to further include a lid fixing member for fixing the lid to the main body.

  In this case, since the barrel tank is provided with a lid fixing member that fixes the lid to the main body by operating the index plunger, it can be easily and surely fixed. There is no need to consider this, and the main body and the lid can be made compatible with other lids and the main body.

  In any of the above-described polishing units, it is preferable that the welded portion of the barrel tank main body is formed by a spot welding method.

  Conventionally, the barrel tank body has been formed by welding a metal plate that forms a side surface to a metal plate bent into a columnar shape by an arc welding method or the like. A thick plate having a thickness of 3 mm or more is used. On the other hand, if the welded portion of the barrel tank main body is formed by the spot welding method as described above, there is less risk of the metal plate being melted. Therefore, it is possible to produce the barrel tank main body using a thin metal plate of about 1 mm. it can. As a result, the barrel tank can be reduced in weight, the burden on the operator can be reduced, the number of work steps for producing the barrel tank can be reduced, and the cost of the members can be reduced. Further, the weight of the barrel tank is reduced, so that the load on the driving source for rotating and revolving the barrel tank is reduced, thereby reducing the energy consumption of the barrel polishing apparatus and degrading the barrel polishing apparatus. Can be suppressed.

  It is preferable that the media to be polished by the centrifugal barrel polishing apparatus including any of the above-described polishing units is formed by dispersing abrasive grains in a resin serving as a base, and the abrasive grains are applied to the media. It is still more preferable that it contains 30-70 mass%. The media preferably has a weight of 0.01 to 50 g or a specific gravity of 1.7 to 2.3.

  Further, the medium is preferably formed by a straight body portion having a circular cross section and having the same continuous cross sectional area, and a reduced diameter portion continuously reducing the diameter from the cross sectional area. Further, it is more preferable that the acute corner portion of the medium is rounded.

  The ratio of the diameter of the circular cross section to the length of the cross section perpendicular to the circular cross section is preferably 1: 0.5 to 1: 1.5.

Polishing using a resin-based medium helps one of the objects of the present invention, “weight reduction”. However, if the resin content is low, sufficient polishing power cannot be obtained. In order to contribute to weight reduction and to obtain a sufficient polishing power, it is preferable that the content of abrasive grains contained in the medium is 30 to 70%. Furthermore, it is preferable that the media has a weight of 0.01 to 50 g or a specific gravity of 1.7 to 2.3.

The centrifugal barrel polishing apparatus including any of the above-described polishing units has a high grinding power because the barrel tank rotates and revolves during polishing. However, the amount of media worn compared to other types of barrel polishing apparatuses (for example, a rotary type) is high. Is big. By making the shape of the media a combination of the straight body portion and the reduced diameter portion as described above, the collision energy is dispersed when colliding with the work and barrel tank that cause media wear. It is possible to prevent so-called partial wear, cracks and chipping, etc., in which only portions are worn intensively. Further, by rounding the acute angle portion, it is possible to prevent cracks and chips from starting. In the media having a shape in which the straight body portion and the reduced diameter portion are combined, the shape that has a sufficient polishing force and prevents the above-described piece edge, crack, and chipping is the circular cross section and the above-described shape. The ratio of the lengths of the cross sections perpendicular to the cross section is preferably in the range of 1: 0.5 to 1: 1.5.

The accompanying drawings, which are incorporated in and constitute a part of the specification, schematically illustrate preferred embodiments of the present invention, and together with the general description above and the detailed description of the preferred embodiments below, the subject matter of the present invention. Help explain.
It is explanatory drawing which shows the structure of the barrel tank of the grinding | polishing unit which concerns on this invention. 1A is a perspective view of a barrel tank, and FIG. 1B is a side perspective view. It is explanatory drawing which shows the structure of the grinding | polishing unit which concerns on this invention. 2A is a perspective view of the polishing unit, and FIG. 2B is an enlarged cross-sectional view taken along the line AA in FIG. 2A. 3 (A) to 3 (D) are explanatory views showing the structure of the lid fixing member in the barrel tank of the polishing unit according to the present invention and the method for fixing the lid to the main body by the lid fixing member. It is a perspective view which shows the conventional grinding | polishing unit. It is explanatory drawing which shows the shape of the medium which concerns on this invention. 5A is a front view, and FIG. 5B is a view (bottom view) taken along line AA in FIG. 5A.

  A polishing unit used in the centrifugal barrel polishing apparatus according to the present invention will be described. In addition, this invention is not limited to the following embodiment.

  As shown in FIG. 1, the barrel tank 10 is formed in a cylindrical shape having a polygonal or circular longitudinal cross section, and has a main body portion 11 having an opening portion 11a for loading a workpiece and a medium at the upper portion, and an opening. And a lid 12 for sealing the portion 11a. In this embodiment, the barrel tank 10 has an octagonal longitudinal cross-sectional shape as an example.

  On the inner surface of the main body 11 and the lower surface of the lid 12, a lining 13 made of a wear-resistant rubber member for preventing wear on each surface is formed as in the conventional polishing unit.

The lid fixing members 14 for fixing the lid 12 to the main body 11 are provided at four locations on the lid 12 corresponding to the fixing positions (holes 11 b) outside the opening 11 a of the main body 11.
When the lid 12 to be attached to the main body portion 11 is aligned with a predetermined position with respect to the main body portion 11, a pin, a ball, or an equivalent thereof (not shown) protrudes. 12 includes an index plunger 14a that positions 12 and a lid pressing member 14b that can press the lid 12 against the main body 11 via the index plunger 14a by operating the index plunger 14a. FIG. 1 shows a state in which the lid 12 is fixed to the main body 11 by the lid fixing member 14.

  FIG. 3 shows the structure of the lid fixing member 14, the structure for fixing the lid 12 to the main body 11 by the lid fixing member 14, and the fixing method. Here, the upper half part of FIG. 3A and FIGS. 3B to 3D are perspective views of the fixing structure seen from the side, and the lower half part of FIG. It is the top view seen from.

  As shown in FIG. 3 (A), the lid pressing member 14b is configured to be able to rotate a columnar portion that penetrates the lid 12 and can be inserted into the hole 11b of the main body 11 by operating the index plunger 14a. An inclined groove 14c is formed in the cylindrical portion inserted into the hole 11b, and a fixing pin 11c for guiding the inclined groove 14c in the vertical direction is provided inside the hole 11b.

When the lid pressing member 14b is inserted into the hole 11b of the main body 11 as shown in FIG. 3 (B), and the index plunger 14a is moved in the direction of arrow L in FIG. 1 as shown in FIG. 3 (C). The lid pressing member 14b rotates, the inclined groove 14c is guided by the fixing pin 11c, and the index plunger 14a moves downward.
When the index plunger 14a reaches a predetermined position, the pin protrudes downward to position the lid pressing member 14b at the predetermined rotation position, and presses the upper surface of the lid 12 as shown in FIG. Thus, the lid 12 can be fixed to the main body 11. Here, since the index plunger 14a is positioned at a predetermined position (the position of one end L of the arrow in FIG. 1), the displacement of the lid 12 pressing the main body portion 11 via the index plunger 14a by the lid pressing member 14b is constant. (That is, the pressing force is constant).
When the index plunger 14a is rotated in the direction O in FIG.

  Thus, since the barrel tank 10 includes the lid fixing member 14 that fixes the lid 12 to the main body portion 11 and can be easily and surely fixed, the consistency between the main body portion 11 and the lid 12 is considered. The main body 11 and the lid 12 may be compatible with other lids and the main body.

  Here, the position and number of the lid fixing members 14 can be set as appropriate depending on the size of the barrel tank 10 and the like.

  As shown in FIG. 2, the barrel tank case 20 includes a tray 21 on which the barrel tank 10 is placed and held, a barrel tank fixing member 22 that fixes the barrel tank 10 to the tray 21, and a barrel tank 10 being attached and detached. The barrel tank fixing member 22 is provided with a pair of guide portions 23 that guide the barrel tank fixing member 22 so as to be movable in the horizontal direction (in this embodiment, the rotation axis direction). The barrel tank case 20 is attached to a turret (revolution disk) of a centrifugal barrel device (not shown) through a rotating shaft 24 so as to be rotatable.

  The guide part 23 is provided on both side surfaces in the rotation axis direction, and when the barrel tank fixing member 22 is inserted, the guide part 23 is disposed between the inner peripheral surface of the guide part 23 and the outer peripheral surface of the barrel tank fixing member 22. It is formed in an annular shape so that a gap that does not hinder the movement of the tank fixing member 22 is formed.

  The barrel tank fixing member 22 is disposed so as to be opposed to the tray 21 so that the barrel tank 10 can be pressed vertically downward, and the pressing member 22a for pressing the barrel tank 10 and the barrel tank fixing member 22 are mounted. A protruding member 22c and a protruding member 22d, which are positioning members that limit the movement of the barrel tank fixing member 22 with respect to the guide portion 23, are sometimes provided.

  The pressing member 22a is configured to be able to press the lid 12 vertically downward by adjusting the vertical position with, for example, a tightening bolt 22b. The contact portion 22 e that presses the lid 12 corresponds to the outer shape of the upper surface of the lid 12.

  The convex member 22c is formed in a convex shape on the upper surface of the barrel tank fixing member 22 so as not to pass through the guide portion 23. When the barrel tank fixing member 22 is mounted at the fixed position of the barrel tank 10, the mounting direction (FIG. 2 ( A) is arranged at a position that restricts movement in the direction of arrow M).

The projecting member 22d is formed in a plate shape in the present embodiment, is configured to be retractable inside the barrel tank fixing member 22, and protrudes outward from the interior of the barrel tank fixing member 22 (FIG. 2A). ) Is biased by a spring or the like.
The protruding member 22d protrudes when the barrel tank fixing member 22 is mounted, and is formed so as to limit the movement of the barrel tank fixing member 22 in the release direction (the direction of arrow N in FIG. 2A).
When releasing the barrel tank fixing member 22, the movement restriction can be easily released and moved by storing the protruding member 22 d in the barrel tank fixing member 22 against the bias.

  The guide portion 23 on the mounting direction side may be formed in a cup shape that opens in the release direction instead of the annular shape described above. Also in this case, the movement of the barrel tank fixing member 22 in the mounting direction can be restricted, and the same effect as the convex member 22c is achieved.

Below, the usage example of the grinding | polishing unit 1 of this embodiment is demonstrated.

  First, a work and a medium are put into the main body 11 of the barrel tank 10, the lid 12 is placed in the opening 11 a of the main body 11, and the index plunger 14 a is operated to attach the lid 12 to the main body by the lid fixing member 14. 11 is fixed.

  Next, in a state where the protruding member 22d is pressed and stored in the barrel tank fixing member 22, the barrel tank fixing member 22 is moved along the guide portion 23 in the release direction (the direction of arrow N in FIG. 2A). .

  Subsequently, the barrel tank 10 is placed on the tray 21, and the barrel tank fixing member 22 is mounted along the guide portion 23 in the mounting direction (in the direction of arrow M in FIG. 2A) in which the barrel tank fixing member 22 is mounted at the fixed position of the barrel tank 10. Move. Here, since the protruding member 22d is formed with an inclined portion 22f whose width becomes narrower in the mounting direction M, when the barrel tank fixing member 22 is moved in the mounting direction, the guide member 23 causes the protruding member 22d to be 2 (A) is pushed in the arrow Y direction. Then, when the protruding member 22d passes through the guide portion 23, it protrudes again, and the barrel tank fixing member 22 is positioned at a predetermined position.

Then, the pressing member 22 a is lowered by the fastening bolt 22 b, the lid 12 is pressed vertically downward and pressed against the main body 11, and the barrel tank 10 is fixed to the barrel tank case 20.
Thus, since the lid 12 can be pressed vertically downward by the pressing member 22a and the lid 12 can be fixed to the main body 11 by an appropriate pressing force, the clearance between the barrel tank fixing member 22 and the lid 12 is not affected. The barrel tank 10 can be securely fixed to the barrel tank case 20.
Further, since the contact portion 22e of the pressing member 22a corresponds to the outer shape of the lid 12, the lid 12 is securely fixed to the main body portion 11 by preventing the pressing member 22a and the lid 12 from rattling. be able to.
Since the lid 12 can be fixed to the main body portion 11 in the same pressing state, there is no need to fix the combination of the main body portion 11 and the lid 12, and the main body portion 11 and the lid 12 are in contact with other lids and the main body portion. The polishing unit 1 having compatibility can be obtained.

The main body 11 of the barrel tank 10 used in the present embodiment is manufactured by welding a metal plate forming a side surface to a metal plate bent into a columnar shape by a spot welding method. Conventionally, the barrel tank body has been formed by welding all around by arc welding method, etc. However, because the heat input may be melted, the metal plate should be thicker than 3mm. Has been.
On the other hand, by forming the welded portion of the main body portion 11 by spot welding as in this embodiment, there is less risk of the metal plate being melted. Therefore, the main body portion 11 is produced using a thin metal plate of about 1 mm. can do. Thereby, the barrel tank 10 can be reduced in weight, and the burden on the operator can be reduced, and the number of work steps involved in the production and the cost of the members can be reduced. Furthermore, by reducing the weight, the load on the drive source (for example, drive motor) for rotating and revolving the barrel tank 10 is reduced, so that energy saving of the barrel polishing apparatus 1 can be achieved. Deterioration of the barrel polishing apparatus 1 can be suppressed.
In the conventional barrel tank, when the lining is replaced, a new lining may be formed after the rubber forming the lining is removed by heating. However, in such a replacement method, the cost for newly forming the lining 13 and the manufacturing cost of the polishing barrel tank 10 are not significantly different. Therefore, the new barrel tank 10 may be used without replacing the lining 13.

  As described above, since the operator manually places the barrel tank 10 in which the media and the workpiece are put in the centrifugal barrel polishing apparatus, it is preferable that the barrel tank 10 is lightweight. For this reason, in this embodiment, a medium is used in which a resin is used as a base and abrasive grains are dispersed in the resin. Although it is lighter than the media formed by abrasive grains, if the content of abrasive grains is low, sufficient polishing power cannot be obtained. Therefore, the content of abrasive grains is preferably 30 to 70% by mass with respect to the media. Is preferably 40 to 60%. Further, it is preferable that the weight of the medium is 0.01 to 50 g, desirably 0.02 to 40 g, or the specific gravity of the medium is 1.6 to 2.4, desirably 1.8 to 2.2. . If the weight or specific gravity is smaller than the above range, the barrel flow in the barrel tank 10 is insufficient and sufficient polishing force cannot be obtained. If the weight or specific gravity is larger than the above range, the workpiece and the media are not polished during polishing. The impact causes a dent on the surface of the workpiece. The resin is a thermoplastic resin (eg, nylon resin, polystyrene resin, polypropylene resin, polyamide resin, AS resin, etc.) or thermosetting resin (eg, phenol resin, unsaturated polyester resin, polyurethane resin, epoxy resin, urea). Resins, etc.) can be suitably used. As the abrasive grains, known materials (for example, alumina, silica, silicon carbide, iron oxide, boron oxide, zircon, chromium oxide, diamond, gold sand, and powders thereof, or moldings made from these materials) are used. It can be used suitably. The grain size of the abrasive grains can be appropriately selected according to the type of abrasive grains, the size of the media, the properties of the workpiece, and the purpose of polishing.

  Further, the shape of the media may be spherical, columnar (cylinder, polygonal column), conical, etc. As shown in FIG. 5, a straight cylinder having a circular cross section and the same continuous cross sectional area. And a shape formed by a reduced diameter portion that continuously decreases in diameter from the cross-sectional area. It has a stronger polishing force than spherical media, and as the polishing progresses like a cone shape or a column shape, the media does not shrink, and wears out while maintaining the same shape. Can be maintained for hours. Further, when the square surface of the straight body portion, the intersection of the straight body portion and the reduced diameter portion, or the apex (the most reduced diameter portion) of the reduced diameter portion is an acute angle, the acute angle portion serves as a base point. Since chipping occurs to cause breakage or chipping of the media, or scratches or irregularities (indentations) are formed on the workpiece, media with rounded edges are used. The rounding may be performed after forming a medium having an acute angle portion, or may be formed so as not to have an acute angle portion when the medium is formed.

  The size of the medium is appropriately selected depending on the properties of the workpiece, the purpose of polishing, the size of the barrel tank, etc., and the diameter of the circular section is generally selected from 1 to 50 mm, preferably 2 to 40 mm. preferable. In the media having the above-mentioned shape, the ratio D: L of the diameter D of the circular cross section and the length L of the cross section perpendicular to the circular cross section is 1: 0.5 to 1: 1.5. Is preferred. If L is smaller than D, sufficient polishing force cannot be obtained, and if L is large, the media is reduced during polishing.

  The centrifugal barrel polishing apparatus using the polishing unit of the present invention may be either a dry centrifugal barrel polishing apparatus or a wet centrifugal barrel polishing apparatus.

[Effect of the embodiment]
(1) According to the polishing unit 1 of the present invention, the lid 12 can be pressed vertically downward by the pressing member 22a, and the lid 12 can be fixed to the main body 11 by an appropriate pressing force. The barrel tank 10 can be reliably fixed to the barrel tank case 20 irrespective of the clearance between the lid 12 and the lid 12.
Further, since the contact portion 22e of the pressing member 22a corresponds to the outer shape of the lid 12, the lid 12 is securely fixed to the main body portion 11 by preventing the pressing member 22a and the lid 12 from rattling. be able to.
Since the lid 12 can be fixed to the main body portion 11 in the same pressing state, it is not necessary to limit the combination of the main body portion 11 and the lid 12 to one-to-one, and the main body portion 11 and the lid 12 are the other lid and main body portion. It is possible to make the polishing unit 1 compatible with the above.

(2) Since the barrel tank fixing member 22 is configured to be movable in the horizontal direction when the barrel tank 10 is attached / detached, the barrel tank fixing member 22 can be prevented from hindering the attachment / detachment of the barrel tank 10. The barrel tank 10 can be easily attached and detached.
And, when the barrel tank fixing member 22 is mounted at the fixing position of the barrel tank 10, the movement of the barrel tank fixing member 22 can be limited based on the guide portion 23 by the convex member 22c and the protruding member 22d. The barrel tank 10 can be easily arranged at a fixed position so as not to move.

(3) Since the barrel tank 10 includes the lid fixing member 14 that fixes the lid 12 to the main body 11 by operating the index plunger 14a, the main body 11 and the lid can be easily fixed. Therefore, the main body 11 and the lid 12 can be compatible with other lids and the main body.
Several embodiments of the invention have been described. Nevertheless, it will be understood that various modifications may be made without departing from the spirit and scope of the invention.

DESCRIPTION OF SYMBOLS 1 ... Polishing unit 10 ... Barrel tank 11 ... Main-body part 11a ... Opening part 11b ... Hole 11c ... Fixing pin 12 ... Cover 14 ... Cover fixing member 14a ... Index plunger 14b ... Cover pressing member 14c ... Inclination groove 20 ... Barrel tank case 21 ... Tray 22 ... Barrel tank fixing member 22a ... Pressing member 22b ... Tightening bolt 22c ... Convex member 22d ... Protruding member 22e ... Contact part 23 ... Guide part 24 ... Rotating shaft

Claims (12)

A polishing unit used in a centrifugal barrel polishing apparatus,
A barrel tank having a main body portion into which a member to be polished and a medium are charged, and a lid for sealing the main body portion;
A barrel tank holding the barrel tank; a barrel tank fixing member for fixing the barrel tank to the tray; and a barrel tank case attached to a revolution disk of a centrifugal barrel polishing apparatus,
The barrel tank fixing member has a pressing member corresponding to the outer shape of the lid and configured to be able to press the lid vertically downward. The barrel tank fixing member is
It is inserted into a pair of guide portions that guide the barrel tank fixing member, and is configured to be movable in the horizontal direction when the barrel tank is attached and detached.
The polishing according to claim 1, further comprising a positioning member that restricts movement of the barrel tank fixing member with respect to the guide portion when the barrel tank fixing member is mounted at a fixed position of the barrel tank. unit. The positioning member is
A convex member that restricts movement of the barrel tank fixing member in the mounting direction when the barrel tank fixing member is mounted at the fixing position of the barrel tank;
A protruding member urged in an outward protruding direction from the inside of the barrel tank fixing member, and is configured to be retractable inside the barrel tank fixing member, and the barrel tank fixing member is The polishing unit according to claim 2, further comprising a protruding member that protrudes when mounted at a fixed position and restricts movement of the barrel tank fixing member in a releasing direction.   An index plunger capable of positioning to a predetermined position, a lid pressing member that presses the lid against the main body via the index plunger by operating the index plunger, and the lid on the main body The polishing unit according to any one of claims 1 to 3, further comprising a lid fixing member for fixing.   The polishing unit according to any one of claims 1 to 4, wherein a welded portion of the barrel tank body is formed by a spot welding method. In a polishing method by a centrifugal barrel polishing apparatus comprising the polishing unit according to any one of claims 1 to 5,
A polishing method, wherein the media are formed by dispersing abrasive grains in a resin as a base. The polishing method according to claim 6, wherein the abrasive grains are contained in an amount of 30 to 70% by mass of the media. The polishing method according to claim 6 or 7, wherein the weight of the medium is 0.01 to 50 g. The polishing method according to claim 6 or 7, wherein the specific gravity of the medium is 1.6 to 2.4. The medium has a straight body portion having a circular cross section and having the same continuous cross-sectional area;
A reduced diameter portion continuously reducing the diameter from the cross-sectional area;
The polishing method according to claim 6, wherein the polishing method is formed by: The polishing method according to claim 10, wherein an acute angle portion of the media is rounded. The polishing method according to claim 10 or 11, wherein a ratio of a diameter of the circular cross section to a length of a cross section perpendicular to the circular cross section is 1: 0.5 to 1: 1.5. .

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