JP2003103450A - Sealing method for slidably contacting part between fixed tank and turntable in dry fluid barrel polishing device and dry fluid barrel polishing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent biting of a thin workpiece to be polished with a thickness of <=1 mm or foreign matter such as small burrs peeled off a workpiece to be polished or fragments of abrasive occurring during a polishing process in a gap where a fixed tank and a turntable composing a polishing tank slidably contact in regard to a dry fluid barrel polishing device. SOLUTION: The gap 7 where the fixed tank 2 and the turntable 3 slidably contact during the polishing process is covered by a covering fluidized bed 16 formed by charging hard spherical particles 14, and a polishing fluidized bed 17 is formed by mixing the abrasive 13 and the workpiece 15 to be polished on a top face of the covering fluidized bed 16 to carry out the polishing process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention charges a work to be polished and an abrasive material into a polishing tank which is composed of a cylindrical fixed tank and a rotary disk which rotates in sliding contact with the lower end opening of the fixed tank. Then, the object to be polished and the abrasive material form a polishing fluidized bed by the rotation of the rotary disk, and deburring of the object to be polished by the relative friction between the object to be polished and the abrasive material forming the polishing fluidized layer. The present invention relates to a dry-flow type barrel polishing device that performs polishing processing such as rounding, polishing, and scale removal.

[0002]

2. Description of the Related Art A conventional dry flow type barrel polishing apparatus is used for polishing small burrs separated from a workpiece to be polished during polishing, foreign matters such as fragments of abrasives, or a thin workpiece having a thickness of 1 mm or less. The object is caught in the gap where the inner circumference of the lower opening of the fixed tank and the outer circumference of the rotating disk that make up the polishing tank make sliding contact, and heat is generated locally to weld the linings of the sliding contact section of the fixed tank and the rotating disk. In such a case, the apparatus must be stopped and the lining must be removed for repair or replacement with a new one, which requires a troublesome maintenance.

[0003]

As a method for avoiding the above problems, Japanese Patent No. 2859500 and Japanese Patent Laid-Open No. 200-200500 have been proposed.
No. 1-88006 is listed as a known technique.

The former (Japanese Patent No. 2859500) is provided with a compressed air supply device and a suction device for forcibly blowing it up from below in a gap between a sliding contact portion of a fixed tank and a rotary disk.
This is a method for surely preventing bites in the gap between the sliding contact portion between the fixed tank and the rotary disk by forcibly blowing up the compressed air, which solves the problems described in the prior art and achieves the object of the invention. Although it has been done, there is still a big problem as a device.

The latter (Japanese Patent Laid-Open No. 2001-88006)
Is equipped with a suction device for sucking and passing compressed air from below in the gap between the fixed tank and the rotary disk and a flow rate monitoring device therefor, and since the variation of the gap and the variation of the flow rate of the compressed air are proportional, This is a method of preventing the linings of the sliding contact portions of the fixed tank and the rotary disk from being welded to each other by stopping the apparatus when the flow rate monitoring device senses the flow rate fluctuation of the compressed air when foreign matter is caught. As described above, Japanese Patent Laid-Open No. 2001-
The invention of No. 88006 can theoretically prevent welding of the linings, but enables continuous operation without stopping the device during polishing, which is one of the problems described in the prior art. With respect to points, there are challenges.

[0006]

The present invention has been completed to solve the above-mentioned problems. The invention according to claim 1 is a cylindrical fixed tank and the inner circumference of the lower end opening of the fixed tank. In the polishing tank, which consists of a plate-shaped rotating plate with a minimum gap so that it can slide, the polishing material and bulk specific gravity are larger than the above-mentioned polishing material, and the particle diameter rotates with the fixed tank. A spherical hard spherical particle having a diameter larger than that of the sliding contact of the disk and having no voids therein is charged, and the rotation speed of the rotary disk is adjusted in a low speed rotation range to obtain the hard spherical particle. The body forms a coated fluidized bed that covers a gap where the fixed tank and the rotary disk are in sliding contact with each other, and the abrasive forms a fluidized layer on the upper surface of the coated fluidized bed. Next, the polishing fluidized bed formed by charging the workpiece to be polished into the fluidized bed of the abrasive material and mixing and forming it can be polished without contacting with the gap where the fixed tank and the rotary disk are in sliding contact. Characterize.

According to a second aspect of the present invention, in the hard spherical particles of the first aspect, the bulk specific gravity is 3 times or more that of the abrasive, and the particle diameter is 3 times the gap between the fixed tank and the rotating disk. It is characterized in that it is made of a hard spherical material having no holes inside.

According to a third aspect of the present invention, the rotational peripheral speed of the rotary disc according to the first or second aspect is in the low speed range.
It is characterized by being set to 50 to 250 m / min.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a dry fluidized barrel polishing apparatus according to the present invention and an object to be polished of the dry fluidized barrel polishing apparatus, which is an ultra thin material, has an outer diameter of 25 mm, an inner diameter of 12 mm and a thickness of An example of deburring and polishing a 0.1 mm flat washer will be described in detail with reference to the drawings.

As shown in FIG. 1, the dry flow type barrel polishing apparatus of the present invention has a plurality of convex portions 1 at equal intervals in the circumferential direction.
A fixed tank 2 having a cylindrical fixed tank B lining 8 having 2 attached to the inner surface thereof, and a fixed tank A lining 9 forming a collar 6 at the lower end opening circumferential portion, which is continuously provided to the fixed tank B lining 8; The end face of the collar portion 6 of the fixed tank A lining 9 and 0.
A clearance 7 of 3 to 0.4 mm is provided and the upper surface is fixed tank A
A doughnut-shaped turntable A lining 10 aligned with an extension line of the upper surface of the collar 6 of the lining 9 is attached to the outer peripheral portion, and the donut-shaped hollow portion of the turntable A lining 10 has radial convex portions 5 from the center. It is composed of a polishing disk 1 in which a disk-shaped rotary disk 3 fitted with a rotary disk B lining 11 having the above and a drive source 4 for rotating the rotary disk 3 are integrated. The fixed tank A lining 9 and the turntable A
The materials of the lining 10 are in sliding contact with each other and the gap 7 is 0.3.
It is made of wear-resistant metal because a machining accuracy of ~ 0.4 mm is required, and the material of the fixed tank B lining 8 and the turntable B lining 11 does not require particularly precise machining accuracy, so it is wear-resistant. Made of excellent urethane rubber.

In the dry flow type barrel polishing apparatus having the above-mentioned structure, the outer diameter is 3 to 4 mm and the bulk specific gravity is in the polishing tank 1 having an inner diameter of 430 mm, a height of 300 mm and an internal volume of about 40 liters. Of 10 to 14 liters of the polygonal abrasive 13 having a particle size of 1.1 to 1.5, and a hard spherical particle 14 having a particle diameter of 2.4 mm and a bulk specific gravity of 3.5 to 4.5 of 2.5 to 3.
When 5 liters are charged and the rotational speed of the drive source 4 is adjusted and driven so that the peripheral speed of the rotary disk 3 is 150 to 250 m / min, the abrasive 13 and the hard spherical particles 14 rotate. Centrifugal force is applied by the rotation of the disk 3, and as shown in FIG. 2, the hard spherical particles 14 having a large bulk specific gravity fix the rotary disk B lining 11 and the rotary disk A lining 10 and the fixed tank 2 of the rotary disk 3. While reaching the tank A lining 9 and the fixed tank B lining 8, the coating fluidized bed 16 flows and forms in the circumferential direction,
A fluidized bed of the abrasive material 13 is formed on the upper surface of the coated fluidized bed 16, and the coated fluidized bed 16 maintains a state in which it constantly covers the gap 7 between the fixed tank A lining 9 and the rotary disc A lining 10.

The material used for the hard spherical particles 14 is
Like stainless steel balls, carbon steel balls, bearing steel balls,
Spherical particles that do not have voids inside and do not crack during polishing are used.

Next, the loading amount of the flat washer of the ultra-thin work piece 15 to be polished is set to about 5,000 sheets (volume conversion: about 5 liters), and it is dropped from the upper center of the polishing tank 1 little by little. Once in, the work to be polished 15 is coated with the fluidized bed 16
3 is mixed with the abrasive material 13 without being mixed with, and centrifugal force is applied by the rotation of the rotary disk 3 as shown by the arrow in FIG. 3, and the coating fluidized bed 16 is placed on the inner wall of the fixed tank 2 on the fixed tank B lining 8 side. Toward the fixed tank B lining 8 and then is pushed up along the fixed tank B lining 8 to collide with the convex portion 12 of the fixed tank B lining 8 and then folded back to the inside of the fixed tank 2 to descend to the workpiece 15 to be polished. While the abrasive material 13 spirally twists and flows, a polishing fluidized layer 17 that reaches the rotary disk B lining 11 side of the rotary disk 3 is formed. In the polishing fluidized layer 17, the workpiece 15 and the abrasive material 13 are separated. Deburring and polishing of the workpiece 15 is performed by causing relative friction. Meanwhile, as shown in FIG. 3, the polishing fluidized bed 17 and the coating fluidized bed 16 are not mixed with each other and the formation rate of the polishing fluidized bed 17 and the coating fluidized bed 16 is maintained at about 95% or more.
6 is the fixed tank A lining 9 and the turntable A lining 1
The state of always covering the gap 7 of 0 is maintained.

As described above, the state in which the coating fluidized bed 16 constantly covers the gap 7 is maintained, and the rate of formation of the polishing fluidized bed 17 and the coating fluidized bed 16 can be controlled without mixing the polishing fluidized bed 17 and the coating fluidized bed 16. The condition for maintaining about 95% or more is, of course, that the particle diameter of the hard spherical particles 14 to be charged is larger than the gap 7, but first, the bulk specific gravity of the hard spherical particles 14 is large. Is at least three times as large as that of the abrasive material 13, has no pores inside the hard spherical particles 14, and is a wear-resistant spherical particle that does not crack during polishing. It is an essential condition that the peripheral speed of rotation is 150 to 250 m / min in the low speed range.

The hard spherical particles 14 which is the first condition
When the bulk specific gravity of is less than 3 times that of the abrasive 13, that is, the smaller the difference in bulk specific gravity between the hard spherical particles 14 and the abrasive 13, the lower the formation rate of the polishing fluidized bed 17 and the coating fluidized bed 16, The hard spherical particles 14 mix with the abrasive 13 and the work piece 15. Therefore, the clearance 7 in which the fixed tank A lining 9 of the fixed tank 2 and the rotary disk A lining 10 of the rotary disk 3 are in sliding contact with each other
In addition, it is possible to prevent foreign matter such as small burrs and fragments of the abrasive material 13 which are separated from the work piece 15 to be generated during the deburring and polishing work, or the work piece 15 having a thickness of 1 mm or less from being caught. If the hard spherical granules 14 are cracked during polishing, the debris is generated in the gap 7 where the fixed tank A lining 9 of the fixed tank 2 and the rotary disk A lining 10 of the rotary disk 3 are in sliding contact with each other. There is a risk of biting.

When the rotating peripheral speed of the turntable 3 which is the second condition is set to 250 m / min or more, the coated fluidized bed 16
Since the centrifugal force applied to the hard spherical particles 14 becomes large, the layer thickness of the coating fluidized bed 16 becomes thin and the fixed tank A of the fixed tank 2 becomes
The gap 7 where the lining 9 and the rotary disk A lining 10 of the rotary disk 3 are in sliding contact cannot be reliably covered, and small burrs of the workpiece 15 in the polishing fluidized bed 17 and the polishing material 13 are formed.
When the rotational peripheral speed of the rotary disk 3 is set to 150 m / min or less, the centrifugal force applied to the abrasive material 13 of the polishing fluidized bed 17 and the material to be polished 15 is generated. As a result, the efficiency of deburring and polishing is reduced.

The positions of the plurality of protrusions 12 provided in the fixed tank B lining 8 in the height direction are the polishing fluidized bed formed by charging the workpiece 15 and the polishing material 13 into the polishing tank 1. It may be set according to the capacity of 17, and the convex portion 5 provided radially from the central portion of the rotary disk B lining 11 is formed by charging the hard spherical particles 14 into the polishing tank 1. When the covering fluidized bed 16 to be disturbed disturbs the sealing state of the gap 7 between the fixed tank A lining 9 and the rotary disk A lining 10, the shape of the convex portion 5 may be changed or eliminated.

From the above, the polishing fluidized bed 17 and the coating fluidized bed 17 are not mixed with each other under the condition that the rotating peripheral speed of the rotating disk 3 in this embodiment is 188 m / min. The formation rate of the coating fluidized bed 16 is maintained at about 95% or more, and the coating fluidized bed 16 maintains a state in which it constantly covers the gap 7 between the fixed tank A lining 9 of the fixed tank 2 and the rotary disk A lining 10 of the rotary disk 3. And the processing time is 2
A desired deburring and polishing effect can be obtained within 0 min.

[0019]

According to the present invention, the coating fluidized bed 16 is fixed to the fixed vessel A lining of the fixed vessel 2 without mixing the polishing fluidized bed 17 and the coating fluidized bed 16 without remodeling the apparatus or making the equipment large. 9 is capable of deburring and polishing the workpiece 15 while maintaining a state in which the gap 7 between the rotary disc A and the rotary disc A lining 10 of the rotary disc 3 is constantly covered. This is a problem in the conventional dry flow type barrel polishing apparatus. The foreign matter such as small burrs peeled off from the work-to-be-polished workpiece 15 generated during the deburring polishing process, fragments of the polishing material 13, or the thickness of
This is a method for surely preventing a workpiece to be polished 15 mm or less from being caught in the gap 7 where the fixed tank A lining 9 of the fixed tank 2 and the rotary disk A lining 10 of the rotary disk 3 are in sliding contact with each other. It is extremely valuable to the industry as a method for sealing the sliding contact portion between the fixed tank and the rotary plate in a dry fluidized barrel polishing machine that can perform processing without stopping the equipment on the way, and as a dry fluidized barrel polishing machine. .

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a dry flow type barrel polishing device as seen from the front.

FIG. 2 is a partial detailed view showing a state in which an abrasive and hard spherical particles are loaded into a polishing tank of a dry fluid type barrel polishing apparatus, and a turntable is rotated.

FIG. 3 is a partial detailed view showing a state in which an abrasive, hard spherical particles, and an object to be polished are loaded into a polishing tank in a dry fluidized barrel polishing apparatus, and a turntable is rotated.

[Explanation of symbols]

1 polishing tank 2 fixed tank 3 turntable 4 drive source 5 convex 6 collar part 7 gap 8 Fixed tank B lining 9 Fixed tank A lining 10 Turntable A lining 11 Turntable B lining 12 convex 13 Abrasive 14 Hard spherical particles 15 Workpiece to be polished 16 coated fluidized bed 17 Polished fluidized bed

Claims (3)

[Claims] 1. A polishing tank comprising a cylindrical fixed tank and a plate-shaped rotary disk having a minimum clearance slidably in the inner peripheral portion of the lower end opening of the fixed tank, wherein an abrasive and a bulk specific gravity are contained. Larger than the abrasive, the particle size is larger than the gap in which the fixed tank and the rotary disk are in sliding contact, and charged with spherical hard spherical particles having no holes inside, The rotation speed of the rotary disk is adjusted in a low speed rotation range to form a coated fluidized bed that covers a gap where the hard spherical particles are in sliding contact with the fixed tank and the rotary disk, and the polishing is performed on the upper surface of the coated fluidized bed. The material forms a fluidized bed. Next, a dry fluidized bed that allows polishing to be carried out without contacting the fluidized bed of the abrasive material into which the workpiece to be polished is mixed and formed, and does not come into contact with the gap in which the fixed tank and the rotary disk are in sliding contact. A method and apparatus for sealing a sliding contact portion between a fixed tank and a turntable in a die barrel polishing apparatus. 2. A spherical hard spherical particle having a bulk specific gravity of 3 times or more that of an abrasive, a particle size of 3 times or more of a gap in which a fixed tank and a rotary disk are in sliding contact, and having no pores inside. Charge
2. The sliding between the fixed tank and the rotary disk in the dry fluidized barrel polishing apparatus according to claim 1, wherein a coating fluidized bed is formed in a gap where the fixed tank and the rotary disk are in sliding contact with each other when the rotary disk rotates. Method and apparatus for sealing contact area. 3. The rotating peripheral speed of the turntable is 150 to 250 m /
3. A method for sealing a sliding contact portion between a fixed tank and a rotary plate in a dry flow type barrel polishing apparatus according to claim 1 or 2, and the apparatus therefor, which is set to min.