TWI488711B - A grinding unit and a grinding method using a grinding unit - Google Patents

Description

Grinding unit and grinding method using the same

[Reciprocal reference of related applications]

The present invention claims the priority of the Japanese Patent Application No. 2010-216294 (filed on September 28, 2010) and the title of the invention, the "grinding unit", the entire contents of which are incorporated herein by reference. in.

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.

Since the prior art, the following centrifugal barrel polishing apparatus has been widely used: in order to remove the burrs, rounding, polishing, etc. of the workpiece (workpiece), the workpiece and the grinding medium are put into the tank to make the tank Self-revolving, thereby causing the grinding medium to flow to grind the workpiece. The prior grinding unit used in such a centrifugal barrel polishing apparatus is disclosed, for example, in Patent Document 1.

Figure 4 shows an example of a prior grinding unit. The conventional polishing unit 100 includes a cylindrical groove 110 formed of a box-shaped body 111 and a groove cover 112, and a cylindrical casing 120 rotatably attached to a rotating seat (revolving disk) (not shown). When the canister 110 is fixed to the canister 120, the operator manually operates the operating lever 122 of the fixing member 121 provided in the canister 120 to rotate the eccentric bar 123, thereby forming the cam 124 and the groove cover 112. The shoulder portion 113 of the upper surface abuts, so that the groove cover 112 is firmly pressed against the body 111 and fixed.

[Previous Technical Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. Hei 11-58214 (SINTOBRATOR Co., Ltd.)

In the prior polishing unit 100 as described above, since the cylindrical groove 110 does not have a means for fixing the groove cover 112 to the body 111, in order to generate sufficient pressing force by the eccentric amount of the cam 124, the cam 124 and the shoulder are provided. The gap between 113 requires higher precision. Therefore, if the body 111 and the slot cover 112 do not match each other, there is a gap that exceeds a predetermined range. Therefore, the body 111 and the slot cover 112 do not have compatibility with other slot covers and the body, and the tube cannot be effectively performed. The problem of loading and unloading operations of the tank 110. Further, depending on the amount of eccentricity of the cam 124 and the gap between the cam 124 and the shoulder 113, the magnitude of the pressing force and the direction of action of the pressing force are determined. Therefore, there is a problem that it is difficult to control the pressing force to a fixed value and to fix the direction.

Further, when the rubber lining on the inner surface of the cylindrical groove 110 is replaced, the rubber forming the inner lining may be heated and removed. At this time, if the main body 111 or the groove cover 112 or both are thermally deformed, the cam 124 and the shoulder are provided. Since the gap between the portions 113 changes, it is necessary to correct the gap, and it is sometimes necessary to replace at least one of the body 111 and the groove cover 112.

Further, as described above, since the cylindrical groove 110 requires maintenance (for example, the cylindrical groove is replaced by abrasion of the rubber inner liner), or the workpiece and the polishing medium are required to be taken in and out with respect to the cylindrical groove 110, it is required to be attached and detached. Lightweight.

Therefore, the object of the present invention is to provide a compatibility between the body and the groove cover of the cylindrical groove and the other groove cover and the body, and can securely fix the groove cover to the groove body and fix the groove to the groove body. And a grinding unit excellent in maintainability, and a grinding method using the grinding unit.

In order to achieve the above object, an embodiment of the present invention provides a polishing unit used in a centrifugal barrel polishing apparatus, comprising: a cylindrical groove having a body portion into which the member to be polished and the medium are loaded, and sealing the body portion a trough cover; and a trough casing having a tray for holding the trough and a trough fixing member for fixing the trough to the tray, and mounted on a revolving disc of the centrifugal barrel polishing device; The fixing member has a pressing member that is configured to press the groove cover vertically downward in accordance with the shape of the groove cover.

According to this embodiment, the groove cover can be pressed vertically downward by the pressing member, and the groove cover can be fixed to the body portion by a suitable pressing force, so that the tube can be surely held regardless of the gap between the groove fixing member and the groove cover The slot is fixed to the slot box.

Further, since the pressing member has a shape corresponding to the groove cover, the groove cover can be surely fixed to the body portion by preventing the pressing member and the groove cover from being loosened.

Since the groove cover can be fixed to the main body portion under the same pressing state, it is not necessary to fix the combination of the main body portion and the groove cover, so that the cylindrical groove body and the groove cover can be made compatible with the polishing unit.

In this case, the cylindrical groove fixing member is inserted into a pair of guiding portions for guiding the cylindrical groove fixing member, and is configured to be movable in a horizontal direction when the cylindrical groove is attached or detached, and may also have a groove when the groove is to be When the fixing member is attached to the fixed position of the cylindrical groove, the positioning member that restricts the movement of the cylindrical groove fixing member is based on the guide portion.

According to this configuration, since the cylindrical groove fixing member is inserted into the pair of guiding portions of the guiding cylindrical groove fixing member, and is configured to be movable in the horizontal direction when the cylindrical groove is attached or detached, the cylindrical fixing member does not affect the cylindrical groove. Loading and unloading, so that the loading and unloading of the tank can be easily performed.

Further, when the cylindrical groove fixing member is attached to the fixed position of the cylindrical groove, the movement of the cylindrical groove fixing member can be restricted by the positioning member with respect to the guide portion, so that the cylindrical groove can be easily disposed at the fixed position without being mobile.

The positioning member may further include: a convex member that restricts movement of the cylindrical groove fixing member in a mounting direction when the cylindrical groove fixing member is attached to the fixed position of the cylindrical groove; and a protruding member that is oriented from the cylindrical groove The inside of the fixing member is biased in a direction protruding outward, and is configured to be housed inside the cylindrical groove fixing member, and protrudes when the cylindrical groove fixing member is attached to the fixed position of the cylindrical groove, thereby restricting the above The movement of the tubular fixing member in the releasing direction.

In this case, when the cylindrical groove fixing member is attached, the movement of the cylindrical groove fixing member in the mounting direction can be restricted by the convex member, and the movement of the cylindrical groove fixing member in the releasing direction can be restricted by the protruding member. Thereby, the cylindrical groove can be easily placed at a fixed position without being moved.

Since the protruding member is biased in a direction in which the protruding member protrudes outward from the inside of the positioning member, the movement of the protruding member in the releasing direction can be restricted by merely attaching the cylindrical fixing member to the fixed position of the cylindrical groove.

Preferably, the polishing unit of the present invention further includes: an indexing pin that can be positioned at a predetermined position, and a groove cover pressing member that presses the groove cover to the main body portion by operating the indexing pin and the indexing pin; a groove cover fixing member for fixing the groove cover to the body portion.

In this case, since the cylindrical groove has the groove cover fixing member for fixing the groove cover to the main body portion by operating the indexing pin, the fixing can be easily and surely fixed, so that the matching between the body portion and the groove cover can be omitted. The compatibility between the body portion and the groove cover relative to the other groove covers and the body can be imparted.

In any of the above polishing units, it is preferable that the welded portion of the cylindrical body portion is formed by a spot welding method.

In the prior art, the cylindrical body portion is formed by welding all the metal plates forming the side surface of the metal plate bent into a column by arc welding or the like, and there is a large amount of heat input to cause a melt loss. Use thicker ones with a thickness of 3 mm or more. On the other hand, if the welded portion of the cylindrical body portion is formed by the spot welding method as described above, the metal sheet is less likely to be melted, so that the cylindrical body portion can be formed using a thin metal plate of about 1 mm. . Thereby, the groove can be made lighter, the burden on the operator can be reduced, and the number of man-hours for manufacturing the groove can be reduced and the cost of the component can be reduced. Further, by reducing the weight of the cylindrical groove, the load on the driving source for performing the rotation and the revolving motion of the cylindrical groove can be reduced, whereby the energy saving of the cylindrical polishing device can be achieved and the deterioration of the cylindrical polishing device can be suppressed.

The medium to be polished by using a centrifugal barrel polishing apparatus having any one of the above polishing units is preferably formed by dispersing abrasive grains in a resin which is a matrix, and more preferably, the abrasive grains are 30 to 70 mass with respect to the medium. %. Further, the weight of the medium is preferably from 0.01 to 50 g or the specific gravity is preferably from 1.7 to 2.3.

Further, the medium is preferably formed of a straight body portion having a circular cross section and having a continuous same cross-sectional area, and a reduced diameter portion continuously reduced in diameter from the cross-sectional area, and more preferably an acute angle to the medium. The department performs rounding.

Further, the diameter of the circular cross section and the length of the cross section orthogonal to the circular cross section are preferably 1:0.5 to 1:1.5.

Grinding using a medium having a resin as a matrix contributes to "light weight" which is one of the objects of the present invention. However, if the content of the resin is small, sufficient polishing force cannot be obtained. In order to contribute to weight reduction and to obtain sufficient polishing power, it is preferred to set the content of the abrasive grains contained in the medium to 30 to 70%. Further, the weight of the medium is preferably from 0.01 to 50 g or the specific gravity is preferably from 1.7 to 2.3.

When the centrifugal barrel polishing apparatus including any one of the above-described polishing units is polished, the cylinder groove is ground by revolving, so that the grinding force is high, but the amount of the medium is lost compared with other types of barrel polishing apparatuses (for example, rotary type). Larger. By combining the shape of the medium and the shape of the reduced diameter portion as described above, the collision energy is dispersed when the workpiece which is a dielectric loss collides with the groove, thereby preventing only a certain portion from being intensively worn. Unilateral wear or crack, notch, etc. Further, by performing rounding processing on the acute corner portion, it is prevented from becoming a starting point of cracking and chipping. The medium in which the shape of the straight body portion and the reduced diameter portion are combined has a sufficient polishing force, and is used to prevent the unilateral wear or crack as described above, and the optimum shape of the notch is preferably such that the circular cross section and the cross section are The ratio of the lengths of the orthogonal sections is in the range of 1:0.5 to 1:1.5.

The polishing unit used in the centrifugal barrel polishing apparatus of the present invention will be described. Furthermore, the present invention is not limited to the following embodiments.

As shown in FIG. 1, the longitudinal section of the cylindrical groove 10 is formed into a polygonal or circular cylindrical shape, and the cylindrical groove 10 is provided with a main body portion 11 having an opening portion 11a for loading the workpiece and the medium on the upper portion; The groove cover 12 of the opening portion 11a is sealed. In the present embodiment, as an example, the longitudinal cross-sectional shape of the cylindrical groove 10 is formed into an eight-sided shape.

On the inner surface of the main body portion 11 and the lower surface of the groove cover 12, an inner liner 13 composed of a wear-resistant rubber member for preventing abrasion of each surface is formed in the same manner as the previous polishing unit.

The groove cover fixing member 14 for fixing the groove cover 12 to the main body portion 11 is provided at four positions of the groove cover 12 at a fixed position (hole portion 11b) corresponding to the outer side of the opening portion 11a of the main body portion 11.

The cover fixing member 14 includes: an indexing pin 14a which is formed by projecting a latch or a ball or the equivalent when the slot cover 12 to be mounted to the body portion 11 is matched with respect to the body portion 11 at a predetermined position ( The groove cover 12 is positioned by the groove cover pressing member 14b, and the groove cover 12 can be pressed against the body portion 11 by operating the indexing pin 14a and via the indexing pin 14a. Fig. 1 shows a state in which the groove cover is fixed to the main body portion 11 by the groove cover fixing member 14.

3 shows the structure of the slot cover fixing member 14 and the structure and fixing method for fixing the slot cover 12 to the body portion 11 by the slot cover fixing member 14. Here, the upper half of FIG. 3(A) and FIGS. 3(B) to (D) are perspective views of the fixing structure viewed from the side, and the lower half of FIG. 3(A) is a plan view of the main body portion 11 viewed from above.

As shown in FIG. 3(A), the groove cover pressing member 14b is formed by penetrating the groove cover 12 and rotating the cylindrical portion of the hole portion 11b of the main body portion 11 by the operation of the indexing pin 14a. . An inclined groove 14c is formed in the cylindrical portion of the insertion hole portion 11b, and a fixed plug 11c for guiding the inclined groove 14c in the vertical direction is provided inside the hole portion 11b.

As shown in FIG. 3(B), the groove cover pressing member 14b is inserted into the hole portion 11b of the main body portion 11, and as shown in FIG. 3(C), the indexing pin 14a is moved in the direction of the arrow L in FIG. The lid pressing member 14b is rotated, and the inclined pin 14c is guided by the fixing pin 11c to move the indexing pin 14a downward.

Thereafter, after the indexing pin 14a reaches the predetermined position, the latch protrudes downward, thereby positioning the groove cover pressing member 14b at a predetermined rotation position, as shown in FIG. 3(D), pressing the upper surface of the groove cover 12 The slot cover 12 is fixed to the body portion 11. Here, since the indexing pin 14a is positioned at a predetermined position (one end L position of the arrow of FIG. 1), the displacement of the body portion 11 by the groove cover 12 by the groove cover pressing member 14b and via the indexing pin 14a can be made. It is a fixed amount (ie, the pressing force is fixed).

When the indexing pin 14a is rotated in the direction of O in FIG. 2, the pressing of the slot cover 12 is released, so that the slot cover 12 can be removed from the main body portion 11.

In this manner, the cylindrical groove 10 includes the groove cover fixing member 14 that fixes the groove cover 12 to the main body portion 11, and can be easily and reliably fixed. Therefore, the body portion 11 and the groove cover 12 can be matched without being matched, so that the body can be made. The portion 11 and the groove cover 12 are compatible with the other groove cover and the body portion.

Here, the position and the number of the groove cover fixing members 14 may be appropriately set depending on the size of the groove 10 or the like.

As shown in FIG. 2, the cylindrical tank body 20 is provided with the tray 21 which mounts and holds the cylindrical tank 10, the cylinder tank fixing member 22 which fixes the cylinder tank 10 to the pallet 21, and the cylinder tank fixing member 22, and the cylinder tank fixing member. The pair of guide portions 23 are guided so as to be movable in the horizontal direction (in the present embodiment, the direction of the rotation axis). The canister case 20 is attached to a swivel (revolution disk) of a centrifuge device (not shown) so as to be rotatable via the rotary shaft 24.

The guide portion 23 is provided on both side surfaces in the direction of the rotation axis, and is formed in an annular shape in such a manner that when the cylindrical groove fixing member 22 is inserted, the inner circumferential surface of the guide portion 23 and the outer periphery of the cylindrical groove fixing member 22 are formed. Between the faces, a gap is formed which does not hinder the movement of the groove fixing member 22.

The tubular member fixing member 22 includes a pressing member 22a that is mounted on the position facing the tray 21 so as to press the cylindrical groove 10 vertically downward, and presses the cylindrical groove 10; and the convex member 22c and the protruding member 22d of the positioning member When the tubular groove fixing member 22 is attached, the movement of the cylindrical groove fixing member 22 is restricted based on the guide portion 23.

The pressing member 22a is configured by, for example, adjusting the vertical position by the fastening bolt 22b, and pressing the groove cover 12 vertically downward. The contact portion 22e that presses the groove cover 12 corresponds to the outer shape of the upper surface of the groove cover 12.

The convex member 22c is formed on the upper surface of the cylindrical groove fixing member 22 so as not to pass through the convex shape of the guide portion 23, and is disposed in a fixed position when the cylindrical groove fixing member 22 is attached to the cylindrical groove 10, and is restricted in the mounting direction (Fig. The position of the movement of 2 (A) arrow M direction).

In the present embodiment, the protruding member 22d is formed in a plate shape, and is configured to be housed inside the cylindrical groove fixing member 22, and is protruded outward from the inside of the cylindrical groove fixing member 22 by a spring or the like (FIG. 2). (A) The arrow X direction) is pressed.

The protruding member 22d is formed so as to protrude when the cylindrical groove fixing member 22 is attached, and restricts the movement of the cylindrical groove fixing member 22 in the releasing direction (the direction of the arrow N in Fig. 2(A)).

When the cylindrical groove fixing member 22 is released, the protruding member 22d is housed inside the cylindrical groove fixing member 22 against the biasing force, whereby the movement restriction can be easily released and moved.

Further, the guide portion 23 on the mounting direction side may be formed in a cup shape that opens in the releasing direction instead of the above-described ring shape. In this case, the movement of the tubular fixing member 22 in the mounting direction can be restricted, and the same effect as that of the convex member 22c can be exhibited.

Hereinafter, an example of use of the polishing unit 1 of the present embodiment will be described.

First, the workpiece and the medium are placed inside the main body portion 11 of the cylindrical groove 10, the groove cover 12 is placed on the opening portion 11a of the main body portion 11, the indexing pin 14a is operated, and the groove cover 12 is fixed by the groove cover fixing member 14 The body portion 11.

Then, in a state in which the protruding member 22d is pressed and housed in the inside of the cylindrical groove fixing member 22, the cylindrical groove fixing member 22 is moved in the releasing direction (the direction of the arrow N in Fig. 2(A)) along the guiding portion 23.

Then, the cylindrical groove 10 is placed on the tray 21, and is moved along the guide portion 23 in the mounting direction (the direction of the arrow M in Fig. 2(A)) in which the cylindrical groove fixing member 22 is attached to the fixed position of the cylindrical groove 10. Here, since the inclined portion 22f whose width is narrowed in the mounting direction M is formed in the protruding member 22d, when the tubular groove fixing member 22 is moved in the mounting direction, the protruding member 22d is guided by the guiding portion 23 to FIG. 2(A) The arrow is pressed in the Y direction. Thereafter, the protruding member 22d is again protruded by the guide portion 23, and the cylindrical groove fixing member 22 is positioned at a predetermined position.

Thereafter, the pressing member 22a is lowered by the fastening bolt 22b, the groove cover 12 is pressed vertically downward, pressed and sealed to the main body portion 11, and the cylindrical groove 10 is fixed to the cylindrical casing 20.

In this way, the groove cover 12 can be pressed vertically downward by the pressing member 22a, and the groove cover 12 can be fixed to the body portion 11 by a suitable pressing force, so that the gap between the groove fixing member 22 and the groove cover 12 can be The canister 10 is securely fixed to the canister housing 20.

Further, since the contact portion 22e of the pressing member 22a corresponds to the shape of the groove cover 12, the pressing member 22a and the groove cover 12 are prevented from being loosened, and the groove cover 12 can be surely fixed to the body portion 11.

Since the slot cover 12 can be fixed to the main body portion 11 in the same pressing state, it is not necessary to fix the combination of the main body portion 11 and the slot cover 12, so that the main body portion 11 and the slot cover 12 can be formed relative to the other slot cover and the body portion. A grinding unit 1 with compatibility.

The main body portion 11 of the cylindrical groove 10 used in the present embodiment is produced by welding a metal plate having a side surface formed on a metal plate bent into a columnar shape by spot welding. Conventionally, the cylindrical body portion is formed by full-week welding by an arc welding method or the like, and since there is a large amount of heat input, a melt loss occurs. Therefore, a thicker plate having a thickness of 3 mm or more is used for the metal plate. .

On the other hand, as in the present embodiment, the welded portion of the main body portion 11 is formed by the spot welding method, whereby the metal sheet is reduced in melting loss, so that the thin portion can be made of a thin metal plate of about 1 mm. 11. Thereby, the tubular groove 10 can be made lighter, the burden on the operator can be reduced, and the number of man-hours for manufacturing and the cost reduction of the component can be reduced. Further, by the above-described weight reduction, the load on the driving source (for example, the driving motor) for performing the rotation and the revolving motion of the cylindrical groove 10 can be reduced, whereby the energy saving of the barrel polishing apparatus 1 can be achieved and the barrel polishing apparatus can be suppressed. 1 deterioration.

When the lining of the previous cylinder is replaced, there is a case where a new lining is formed by heating to remove the rubber forming the lining. However, in this replacement method, the cost of reforming the inner liner 13 is not much different from the manufacturing cost of the polishing cylinder 10, so that the new cylinder 10 can be used without replacing the inner liner 13.

As described above, since the operator manually places the cylinder 10 into which the medium and the workpiece are placed in the centrifugal barrel polishing apparatus, the lighter the weight, the better. Therefore, in the present embodiment, a medium formed by dispersing abrasive grains in the resin using a resin as a matrix is used. It is lighter than the medium formed by the abrasive grains. However, if the content of the abrasive grains is low, a sufficient polishing force cannot be obtained. Therefore, the ratio of the abrasive grains is preferably 30 to 70% by mass based on the medium. Preferably, it has 40 to 60%. Further, the weight of the medium is preferably 0.01 to 50 g, more preferably 0.02 to 40 g, or the specific gravity of the medium is 1.6 to 2.4, and more preferably 1.8 to 2.2. If the weight or the specific gravity is less than the above range, the flow in the cylinder in the tank 10 is insufficient, and sufficient grinding force cannot be obtained. If the weight or specific gravity is larger than the above range, the surface of the workpiece is rubbed due to collision of the workpiece with the medium during grinding. Produce a flaw. Further, as the above resin, a thermoplastic resin (for example, a nylon resin, a polystyrene resin, a polypropylene resin, a polyamide resin, an AS (Acrylonitrile Styrene) resin, or the like) or a thermosetting resin can be preferably used. (for example, phenol resin, unsaturated polyester resin, polyurethane resin, epoxy resin, urea resin, etc.). As the abrasive grains, a known material (for example, alumina, ceria, lanthanum carbide, iron oxide, boron oxide, zircon, chromia, diamond, corundum, and the like, or such a powder may be preferably used. It is a molded product of raw materials, etc.). Further, the particle size of the abrasive grains can be appropriately selected depending on the type of the abrasive grains, the size of the medium, the properties of the workpiece, and the purpose of polishing.

Further, the shape of the medium is considered to have a spherical shape, a column shape (cylindrical shape, polygonal column), a conical shape, or the like, and as shown in FIG. 5, is a straight body portion having a circular cross section and having a continuous same sectional area, and The shape in which the cross-sectional area is continuously reduced by the reduced diameter portion. It has a stronger grinding force than a spherical medium, and, like a conical shape or a column shape, the medium does not wear unilaterally with the progress of the polishing, and the same shape is lost while maintaining the same shape, so that a high polishing force can be maintained for a long time. Further, when the angular surface of the straight body portion, the intersection of the straight body portion and the reduced diameter portion, or the apex of the reduced diameter portion (the portion having the largest diameter reduction) is an acute angle, the acute angle portion may cause debris at the base point. The medium is broken or notched, or scratches or irregularities (scratches) are formed on the workpiece, so that the medium for rounding the acute angle portion is used. The planing process can be performed after forming a medium having an acute corner portion, or can be formed without an acute angle portion when the medium is formed, either.

The size of the medium is appropriately selected depending on the properties of the workpiece, the purpose of polishing, the size of the cylindrical groove, and the like, and is preferably selected according to the diameter of the circular cross section of approximately 1 to 50 mm, preferably 2 to 40 mm. Further, in the medium having the shape as described above, the ratio D:L of the diameter D of the circular cross section and the length L of the cross section orthogonal to the circular cross section is preferably 1:0.5 to 1:1.5. If L is less than D, sufficient polishing force cannot be obtained, and if L is large, unilateral wear of the medium occurs during polishing.

Further, the centrifugal barrel polishing apparatus using the polishing unit of the present invention may be any one of a dry centrifugal barrel polishing apparatus and a wet centrifugal cylinder polishing apparatus.

[Effect of the embodiment]

(1) According to the polishing unit 1 of the present invention, the groove cover 12 is pressed vertically downward by the pressing member 22a, and the groove cover 12 can be fixed to the body portion 11 by a suitable pressing force, so that the groove fixing member can be omitted. The gap between the 22 and the slot cover 12 securely fixes the slot 10 to the slot case 20.

Further, since the contact portion 22e of the pressing member 22a corresponds to the shape of the groove cover 12, the pressing member 22a and the groove cover 12 are prevented from being loosened, and the groove cover 12 can be surely fixed to the body portion 11.

Since the slot cover 12 can be fixed to the main body portion 11 in the same pressing state, it is not necessary to define the combination of the main body portion 11 and the slot cover 12 one by one, so that the main body portion 11 and the slot cover 12 can be made with other slots. A grinding unit 1 that is compatible with the cover and the body portion.

(2) Since the cylindrical groove fixing member 22 is configured to be movable in the horizontal direction when the cylindrical groove 10 is attached or detached, the cylindrical groove fixing member 22 can prevent the loading and unloading of the cylindrical groove 10, and the loading and unloading of the cylindrical groove 10 can be changed. It's easy.

Further, when the cylindrical groove fixing member 22 is attached to the fixed position of the cylindrical groove 10, the movement of the cylindrical groove fixing member 22 can be restricted by the convex portion 22c and the protruding member 22d with reference to the guide portion 23, so that the can be easily used The groove 10 is disposed at a fixed position so as not to move.

(3) The cylindrical groove 10 includes the groove cover fixing member 14 that fixes the groove cover 12 to the main body portion 11 by operating the indexing pin 14a, and can be easily and surely fixed. Therefore, the main body portion 11 and the groove cover 12 are not considered. The matching property may also be such that the main body portion 11 and the groove cover 12 have compatibility with the other groove covers and the body portion.

Several embodiments of the invention have been described. However, it is to be understood that various modifications can be made without departing from the spirit and scope of the invention.

1, 100. . . Grinding unit

10, 110. . . Tube slot

11. . . Body part

11a. . . Opening

11b. . . Hole

11c. . . Fixed latch

12, 112. . . Slot cover

13. . . Lining

14. . . Slot cover fixing member

14a. . . Indexing pin

14b. . . Slot cover pressing member

14c. . . Inclined slot

20, 120. . . Tubular tank

twenty one. . . tray

twenty two. . . Trough fixing member

22a. . . Pressing member

22b. . . Fastening bolt

22c. . . Convex member

22d‧‧‧ protruding members

22e‧‧‧Contacts

22f‧‧‧ inclined section

23‧‧‧Director

24‧‧‧Rotary axis

111‧‧‧Ontology

113‧‧‧ shoulder

121‧‧‧Fixed components

122‧‧‧Operation lever

123‧‧‧Eccentric stick

124‧‧‧ cam

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in the claims

Fig. 1 is an explanatory view showing the structure of a cylindrical groove of a polishing unit of the present invention. Fig. 1(A) is a perspective view of a cylindrical groove, and Fig. 1(B) is a side perspective view.

Fig. 2 is an explanatory view showing the structure of the polishing unit of the present invention. Fig. 2(A) is a perspective view of the polishing unit, and Fig. 2(B) is an enlarged cross-sectional view taken along line A-A of Fig. 2(A).

3(A) to 3(D) are explanatory views showing the structure of the groove cover fixing member in the cylindrical groove of the polishing unit of the present invention and the method of fixing the groove cover to the main body portion by the groove cover fixing member.

Figure 4 is a perspective view showing a prior grinding unit.

Fig. 5 is an explanatory view showing the shape of the medium of the present invention. Fig. 5(A) is a front view, and Fig. 5(B) is an arrow view (bottom view) taken along line A-A in Fig. 5(A).

1. . . Grinding unit

10. . . Tube slot

11. . . Body part

12. . . Slot cover

20. . . Tubular tank

twenty one. . . tray

twenty two. . . Trough fixing member

22a. . . Pressing member

22b. . . Fastening bolt

22c. . . Convex member

22d. . . Protruding member

22e. . . Contact

22f. . . Inclined portion

twenty three. . . Guide

twenty four. . . Rotary axis

Claims (11)

A polishing unit, which is a user of a centrifugal barrel polishing apparatus, comprising: a cylindrical groove having a body portion into which the member to be polished and the medium is placed, and a groove cover for sealing the body portion; and a cylindrical groove body; The tray has a tray for holding the cylindrical groove, and a cylindrical fixing member for fixing the cylindrical groove to the tray, and is attached to a revolving disc of the centrifugal barrel polishing device; the cylindrical fixing member has a corresponding groove cover a pressing member configured to press the groove cover vertically downward; the cylindrical groove fixing member is configured to be inserted into a pair of guide portions for guiding the cylindrical groove fixing member, and is horizontally attachable when the cylindrical groove is attached or detached Moving upward; and including a positioning member for restricting movement of the cylindrical groove fixing member based on the guide portion when the cylindrical groove fixing member is attached to the fixed position of the cylindrical groove. The polishing unit of claim 1, wherein the positioning member includes: a convex member that restricts the cylindrical fixing member from being mounted when the cylindrical fixing member is attached to the fixed position of the cylindrical groove; And the protruding member is configured to be biased in a direction protruding outward from the inside of the cylindrical fixing member, and is configured to be housed inside the cylindrical fixing member, and to mount the cylindrical fixing member Protruding at a fixed position of the above-mentioned cylindrical groove, and restricting the direction in which the above-mentioned cylindrical fixing member is released Move. A grinding unit according to claim 1 or 2, comprising: an indexing pin which is positionable at a predetermined position; a groove cover pressing member which operates the above-mentioned indexing pin and passes the above-mentioned indexing pin The cover is pressed against the main body portion; and a cover cover fixing member for fixing the groove cover to the main body portion. The polishing unit according to claim 1 or 2, wherein the welded portion of the cylindrical body portion is formed by a spot welding method. A polishing method using a centrifugal barrel polishing apparatus having a polishing unit according to any one of claims 1 to 4, wherein the medium is formed by dispersing abrasive grains in a resin as a matrix. The polishing method of claim 5, wherein the abrasive grains contain 30 to 70% by mass of the medium. The grinding method of claim 5, wherein the weight of the medium is 0.01 to 50 g. For example, in the grinding method of claim 5 or 6, wherein the specific gravity of the medium is 1.6 to 2.4. The polishing method according to claim 5, wherein the medium is formed of a straight body portion having a circular cross section and having a continuous same cross-sectional area, and a reduced diameter portion continuously reduced in diameter from the cross-sectional area. The grinding method of claim 9, wherein the acute angle portion of the medium is rounded. The polishing method of claim 9, wherein a ratio of a diameter of the circular cross section to a length of a cross section orthogonal to the circular cross section is 1:0.5 to 1:1.5.