JPH05269661A - Polishing device - Google Patents

Abstract

PURPOSE:To uniformly polish the whole surface of an article whose shape is complicated and size is small for dental use, jewelry or general parts. CONSTITUTION:One electromagnet 2 is fixed to the inside surface of a lid 5 for opening/closing a container attaching part 6 made of a non-magnetic material provided in a polishing device 1, the other electromagnet 2' is fixed to the back side of the container attaching part 6, and a container 7 containing an article to be polished 8 and a magnetic small piece 9 is attached in the container attaching part 6 so that a pair of electromagnets 2 and 2' are arranged vertically in a fae-to-face manner in the container 7 by closing the lid, and the upper and the lower electromagnets 2 and 2' are electrified alternately so as to oscillate the magnetic small piece 9 in the container 7 for polishing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing device for polishing a complicated and small member, such as a dental, jewelry, or general-purpose part made of metal, ceramics, synthetic resin, or the like, More specifically, it relates to a polishing apparatus that applies magnetic force.

[0002]

2. Description of the Related Art Conventionally, as a polishing method applying a magnetic force, as described in, for example, Japanese Utility Model Laid-Open No. 63-50653, a member mounted on a rotating shaft between an N pole and an S pole arranged opposite to each other. A polishing object is placed with a gap between the N pole and the S pole, and a mixture of magnetic particles, magnetic powder and abrasive grains is put in this gap to perform magnetic polishing suitable for the shape of the polishing surface. A method of forming a brush and rotating the rotary shaft to polish an object to be polished with a magnetic brush, or JP-A-2-18
As described in Japanese Patent No. 0557, the discs arranged along the circumference so that the N poles and the S poles are alternately located are rotated to generate alternate magnetic fields, and fixed close to the upper surface of the discs. There is a method of polishing by giving motion to the small magnetic pieces in the container.

[0003]

However, in the former method using a magnetic brush, when the object to be polished is a dental, jewelry, or general-purpose part having a complicated shape and a small size,
Not only is it difficult to attach an object to be polished to the rotary shaft, but also those having complicated shapes cannot be polished only by rotating the magnetic brush. On the other hand, in the latter method of arranging magnets on the rotating disk and fixing the container containing the object to be polished and the small magnetic pieces on the upper surface of the disk, the strength of the permanent magnets attached to the disk is limited and The movement of the body piece is not sufficient, and the movement of the magnetic body by the rotating magnet is directional, and it is difficult to uniformly polish the entire surface of the object to be polished.

In view of the above-mentioned problems of the conventional polishing apparatus to which magnetic force is applied, the present invention has an entire surface even if the shape is complicated and small for dental, jewelry or general-purpose parts. The present invention is intended to provide a polishing device capable of uniformly polishing.

[0005]

In order to achieve the above-mentioned object, a polishing apparatus according to the present invention has a container in which an object to be polished and a small piece of a magnetic material are placed between a pair of magnetic field generating members opposed to each other. Then, by alternately generating magnetic fields from the magnetic field generating members to the container, the polishing pieces in the container are vibrated to polish the object to be polished.

[0006]

In the polishing apparatus according to the present invention as described above, when a pair of magnetic field generating members facing each other are alternately made to generate the same pole, the magnetic piece in the container vibrates while being given a rotational force. The object to be polished is polished by the vibration of the small magnetic pieces. In addition, when different magnetic poles are alternately generated in the magnetic field generating members arranged opposite to each other, the small magnetic pieces in the container vibrate linearly. In this case, if abrasives, abrasives, etc. are mixed in the container in addition to the magnetic particles, these abrasives and abrasives may be removed by the vibration of the magnetic particles due to the magnetic field generating member as described above. The object to be polished is agitated by. When an electromagnet is used as the magnetic field generating member,
The vibration of the magnetic piece is determined by the oscillation frequency of the oscillation circuit. By varying the oscillation frequency, the vibration of the magnetic piece can be adjusted, and the degree of polishing can be adjusted accordingly.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail based on the embodiments shown in the drawings.

FIG. 1 is a cross-sectional view of one embodiment of a polishing apparatus 1 according to the present invention using an electromagnet, and FIG. 2 is a perspective view of a main part,
FIG. 3 shows an oscillation circuit diagram of the electromagnet. In the figure, reference numerals 2 and 2 ′ are electromagnets formed by winding windings 4 and 4 ′ around iron cores 3 and 3 ′, respectively. The container mounting part 6 made of a magnetic material is fixed to the inner surface of the lid 5 that opens and closes, and the other electromagnet 2'is fixed to the back surface side of the container mounting part 6. A small piece 9 of magnetic material and, if necessary, a container 7 in which abrasives, abrasive grains, etc. are mixed are attached, and a lid 5 is closed to arrange a pair of electromagnets 2 and 2'opposed to the upper and lower sides of the container 7. It is configured to be performed. The container 7 has an openable / closable lid, and an inside of the container 7 is an object to be polished 8 such as a dental prosthesis or jewelry, and a rod-shaped magnetic substance piece 9 made of a magnetic material such as hard stainless steel. In addition to the magnetic particles 9, abrasives and abrasive grains, and if necessary, a surfactant, a polishing agent, an anticorrosive agent, etc. are further added, and the abrasive grains are used as the polishing particles 9. It may be used together.

The electromagnets 2, 2'in the polishing apparatus 1 described above
As shown in FIG. 3, a circuit for generating a magnetic pole is connected to transistors TR ₁ and TR ₂ to periodically energize and cut off electromagnets 2 and 2 ′ so that electromagnets 2 and 2 ′ are cut off. The N and S magnetic poles are alternately and periodically generated on the iron cores 3 and 3 '. In this case, the magnetic poles of the two electromagnets 2 and 2'are connected so that the magnetic poles of the respective electromagnets 2 and 2'close to the container 7 have the same or different polarities. The transistors TR ₁ and TR ₂ are turned on and off by an oscillating circuit, and the voltage between the base and emitter of the transistors TR ₁ and TR ₂ is turned on and off by a pulse signal such as signals B ₁ and B. To do. This oscillator circuit generally constitutes a flip-flop circuit.

According to the polishing apparatus 1 configured as described above, the pair of electromagnets 2, which are arranged above and below the container 7 so as to face each other.
By alternately generating magnetic poles in 2 ', the magnetic piece 9 in the container 7 vibrates by the upper and lower magnetic poles, and the object 8 to be polished also in the container 7 is polished. In the case described above, when the same pole is generated in the magnetic poles of the electromagnets 2 and 2 ′ located above and below the container 7 that are close to the container 7 side, the magnetic substance pieces 9 in the container 7 vibrate while rotating. When the object 8 to be polished is polished and the magnetic poles of both electromagnets 2 and 2'are made different poles, the small magnetic material piece 9 vibrates up and down linearly to polish the object 8 to be polished.
Further, in this case, by mixing an abrasive and abrasive grains in addition to the magnetic substance pieces 9, these are agitated by the vibration of the magnetic substance pieces 9 and the object 8 to be polished is more effectively polished. You can Further, the frequency of the oscillation circuit is varied to change the magnetic pole generation period in the electromagnets 2 and 2 ', so that the frequency of the magnetic material piece 9 can be adjusted, and the degree of polishing of the workpiece 8 can be adjusted accordingly. . Further, in the apparatus of the embodiment, one electromagnet 2 is attached to the lid 5 that opens and closes the container mounting portion 6 of the polishing apparatus 1, so that the container 7 is attached to the container mounting portion 6 and the lid 5 is closed. A pair of electromagnets 2 and 2 ′ can be arranged so as to face each other in the upper and lower sides of the container 7, and the container 7 can be easily attached and detached.

In the illustrated embodiment, the container 7 has a cylindrical shape, but the shape of the container 7 is not particularly limited. Further, although the transistors TR ₁ and TR ₂ are used as the ON / OFF control elements in the circuit of FIG. 3, it is not limited to the transistors and semiconductors such as thyristors can be used. Further, according to the polishing apparatus 1, the magnetic piece 9 placed in the container 7 at the same time as the object 8 to be polished vibrates in the vertical direction by the magnetic poles alternately generated on the upper and lower sides of the container 7, whereby the polishing piece 9 is polished. That is, the polishing direction of the object to be polished 8 is not constantly changed to cause directionality, the polishing does not cause a piece of polishing, and the object 8 to be polished is uniformly polished all over. In addition, by arranging the magnetic poles for vibrating the polishing piece 9 above and below the container 7, the magnetic force from the magnet is more effective than the conventional polishing device in which the rotating magnetic poles are arranged only on the lower surface or the upper surface of the container. In addition, the polishing piece 9 in the container 7 can be made to act, and a magnetic force can be exerted in the entire vertical direction in the container 7, so that polishing by the polishing piece 9 can be made more efficient. In this embodiment, a pair of electromagnets 2 and 2 are arranged above and below the container 7, but the electromagnets 2 and 2 are not shown.
2'may be arranged to face the side of the container 7, or two or more pairs of electromagnets may be arranged to face each other.

Next, FIG. 4 shows a case where a permanent magnet is used as the magnetic field generating member in the polishing apparatus 1, which is made of a non-magnetic material such as aluminum and has permanent magnets at both ends. A container 7 in which the rotating bodies 11 to which 10 and 10 are attached are arranged facing each other above and below a shaft 12 at a predetermined interval, and the object to be polished 8 and the magnetic piece 9 are placed between the upper and lower rotating bodies 11 and 11. Is arranged and the two rotating bodies 11 are rotated at the same speed about the shaft 12 to alternately generate magnetic fields above and below the container 7 to vibrate and polish the small magnetic material pieces 9 in the container 7. is there. In this case, the magnetic poles of the permanent magnets 10 in the upper and lower rotating bodies 11 may have the same pole or different poles. Furthermore, the above-mentioned rotating bodies 11, 11
May be rotated in opposite directions. Also, the permanent magnet 10
May be attached to only one end of the rotating body 11.

Further, as the rotating body, a disk-shaped body can be used as shown in FIG. This is formed by embedding a plurality of permanent magnets 10 ... Inside a disk-shaped rotating body 13 made of a non-magnetic material such as aluminum.
By arranging the disk-shaped rotating bodies 13 above and below the container 7, magnetic fields are alternately generated above and below the container 7.
Also in this case, the same pole may be provided on the upper and lower sides of the container 7, or the upper and lower sides may be different poles from each other, and the upper and lower rotating bodies 13 may be rotated in the same direction or different directions. Good.

[0014]

As described above, the polishing apparatus according to the present invention is
A container containing an object to be polished and a magnetic piece is placed between a pair of magnetic field generating members facing each other, and a magnetic field is alternately generated from the magnetic field generating members to the container to polish the inside of the container. Since it vibrates a small piece for polishing and polishes the object to be polished with this vibrating small piece of magnetic material, compared to a conventional polishing device that rotates a rotating plate with a magnet attached only on the bottom side of the container. Magnetic force effectively acts on the magnetic piece in the container, the magnetic piece can be actively moved and polished efficiently, and the magnetic piece reciprocates while vibrating in the container between the magnetic field generating members. There is no deviation of the polishing state such that only one side of the object to be polished is polished by movement, and even if the shape is complicated and small for dental, jewelry or general parts,
The entire surface can be uniformly polished. Furthermore, if abrasives, abrasives, etc. are mixed in the container in addition to the magnetic particles, these abrasives and abrasives are agitated in the container by the vibration of the magnetic particles, and It can be more effectively polished.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a polishing apparatus according to the present invention.

FIG. 2 is a perspective view of a main part of the polishing apparatus.

FIG. 3 is a circuit diagram of the same.

FIG. 4 is a perspective view of a main part showing another embodiment of the polishing apparatus.

FIG. 5 is a simplified perspective view showing another embodiment of the rotating body.

[Explanation of symbols]

 1 Polishing device 2 Electromagnet 3 Iron core 4 Winding 5 Lid 6 Container mounting part 7 Container 8 Object to be polished 9 Small magnetic material piece 10 Permanent magnet 11 Rotating body 12 Shaft 13 Disc-shaped rotating body

Claims (5)

[Claims] 1. A container containing an object to be polished and a magnetic piece is placed between a pair of magnetic field generating members facing each other,
A polishing apparatus which polishes an object to be polished by vibrating a magnetic piece in the container by alternately generating magnetic fields from the magnetic field generating members in the container. 2. The polishing apparatus according to claim 1, wherein a pair of electromagnets are used as the magnetic field generating member, and the magnetic pieces are vibrated by alternately energizing and interrupting both electromagnets. 3. The polishing apparatus according to claim 2, wherein the same pole is generated in the magnetic poles of both electromagnets on the side close to the container. 4. A polishing apparatus, wherein different poles are generated in magnetic poles of both electromagnets on the side close to the container. 5. The polishing apparatus according to claim 1, wherein an abrasive, abrasive grains, and the like are mixed in the container in addition to the magnetic pieces.