JP2627994B2 - Polishing machine by magnetic force - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal product such as a ring, a frame of a ring, parts of a precision machine, or a hard material such as a hard plastics, which is small in size and whose shape must not be changed by polishing. The present invention relates to a magnetic polishing machine capable of beautifully polishing with good precision and high accuracy.

[0002]

2. Description of the Related Art Conventionally, a ring or a frame of a ring made of a noble metal has been cast by a mold and then polished by hand. In manual polishing, the amount that can be polished in one day's work is about 20 even for skilled workers in the case of a gold frame, and the working efficiency is significantly reduced in the case of platinum harder than gold. Further, the noble metal powder that has been shaved is scattered as dust, and the shavings are collected and collected. However, most of the shavings are scattered, and the amount reaches 5 to 6%. The amount that escapes in this way was not negligible since it was originally an expensive metal.

In addition, when the barrel polishing method is used, there is a problem that the materials to be polished collide with each other, so that the shape of a delicate portion is changed, and that the hardness of the metal is increased by being hit. The present applicant has disclosed a metal polishing machine using a magnet in Japanese Patent Application Laid-Open No. 2-180557. This is a technique in which a magnet disk having N and S poles is rotated, and a large number of small pieces made of a material to be polished and a magnetic material are placed in the magnetic field, thereby polishing the material to be polished with the rotating small pieces.

[0004]

However, according to the above-mentioned technique, the rotation of the polishing piece is increased by increasing the rotation speed of the magnet disk, but the rotation speed of the magnet disk and the rotation speed of the polishing piece are not necessarily in a proportional relationship. However, when the rotation speed of the magnet disk reaches a certain fixed value, the rotation speed of the polishing piece does not increase much even if the rotation speed of the magnet disk is increased. Therefore, there has been a demand for a technique for rotating the polishing piece more vigorously.

[0005]

An object of the present invention is to solve the above-mentioned problems, and the structure is such that an N-pole zone and an S-pole zone are provided alternately on the surface of a disk made of a non-magnetic material, A permanent magnet is buried with the upper surface as the N pole, and a high-speed rotating magnetic disk having the upper surface as the S pole and the permanent magnet is buried in the S pole zone. In a polishing machine provided with a storage space for mounting a container for storing a large number of polishing pieces made of a magnetic material, a part of the outer periphery of the storage space, another permanent magnet, only one pole in the space. It is characterized by being fixed in close proximity.

The magnetic polishing machine of the present invention is provided with a storage space for detachably installing a container for storing the material to be polished on a rotating magnetic disk driven by a motor. The magnet disk is made of a non-magnetic material such as aluminum or plastics, and preferably has a permanent magnet embedded in this material.

[0007] The surface of the magnetic disk is fractionated by one or more straight lines passing through the center line, and an even number of fractions thus obtained are alternately used as S-pole and N-pole zones. By arranging a plurality of permanent magnets, preferably bar-shaped permanent magnets with the S pole facing up in the S pole zone, and arranging the plurality of permanent magnets with the N pole facing up in the N pole zone, And a north pole zone. When two, three,... Straight lines pass through the center line, two, three,... Fan-shaped magnetic pole zones are obtained, respectively. If there are two pairs of S-pole and N-pole zones, that is, two each, the rotation of the magnet disk makes S → N → S → N
The magnetic field is converted four times and the polishing is performed efficiently.

The number of times of conversion of the magnetic field is 100 to 20,000 times / minute, preferably 200 to 10,000 times / minute. Generally, when the number of conversions is increased, the finish is faster. In connection with this, simply increasing the number of conversions does not always make polishing possible.

A bottom plate is provided on the magnet disk, and the space above the bottom plate is used as a storage space for the container. Although a bottom plate is not always necessary, it can be used safely if a bottom plate made of a non-magnetic material is provided between the rotating disk and the container bottom. Above the bottom plate is a storage space where rubber material is stuck around to prevent vibration.

In the present invention, another permanent magnet is fixed to the side wall of the storage space. Other permanent magnets are not limited with respect to their size and magnetic force density, but require at least a magnetic force that affects the magnetic field of the storage space. Generally, rare earth magnets such as samarium cobalt are used as well as permanent magnets used for a magnet disk. The position to be fixed may be any position that affects the magnetic field of the storage unit, and it is generally preferable to be fixed to the lower part of the storage unit on the bottom plate.

The container used in the present invention is plastics,
It is required to be made of a non-magnetic material such as aluminum, capable of accommodating the material to be polished, capable of rotating the polishing piece freely, and having a lid from which the contents do not spill during the polishing operation. A cylindrical container which is preferably detachable and capable of replacing and cleaning the contents as necessary is preferable. Although one container may be used,
In some cases, two or more containers are placed in the storage space. In any case, it is preferable to fix the container so that the container is not moved by the rotation of the magnet disk.

The fixing means is not particularly limited. For example, as shown in FIG. 4, it is a frame having an outer periphery which can freely move in the storage space. It is a thing. On the other hand, if a groove is provided at a position corresponding to the brim of the storage space, starting from a fixed height from the bottom of the storage space and reaching the entrance of the storage space, the frame is inserted into the storage space, and the brim is inserted into the groove. It can be fixed to the lower end. The frame is provided with a through hole through which one or more containers can be detachably fixed. As shown in FIG. 4, as shown in FIG. 4, if the outer diameter is such that the outer diameter can freely pass through the frame, and the outer diameter at the upper end is expanded to an outer diameter that cannot pass through the frame, the container is inserted into the frame, The collar of each frame can be fixed to the storage portion in alignment with the groove.

A large number of polishing pieces are placed in a container together with the material to be polished, and these pieces are magnetized by being exposed to a magnetic field and are mutually connected to form S and N poles in a chain. The material is polished uniformly because it reverses instantaneously, inverts and partially penetrates into fine irregularities of the material to be polished, and violently disturbs and vibrates. Examples of the material of the polishing piece include hard stainless steel and other non-corrosive metals such as nickel steel and chrome steel. That is, any magnetic material that is hard enough to polish a metal piece and hardly rusts may be used. The shape may be a rod shape, a spherical shape, or the like. In the case of a magnetic material, a rod shape is preferable.

[0014]

The magnet for stirring is preferably covered with a soft non-magnetic film such as a plastic material in order to prevent the magnet from being damaged during rotation and from contaminating the material to be polished. The shape may be a cylindrical shape, a disk shape, or the like, and a shape having high stirring efficiency is preferable. In addition, a surfactant, a polishing agent, a rust inhibitor and the like may be added to the container together with a small amount of water.

[0016]

According to the present invention, a fan-shaped S formed radially from the center on the lower surface of a non-magnetic container in which a large number of polishing pieces are placed in a container together with a material to be polished and, in some cases, a permanent magnet piece for stirring. A disk in which a pole zone and an N pole zone are alternately arranged is rotated, and a non-magnetic container is placed in a magnetic field in which the S pole and the N pole alternately violently change. As a result, since the polishing piece is placed in a strong magnetic field, it violently rotates and is disturbed, and the polishing piece vigorously penetrates into the details of the material to be polished and uniformly polishes the whole.

In particular, in the present invention, since another strong other magnet is fixed to a part of the outer periphery of the accommodating portion, the magnetic field which is alternately converted is buffered under the influence of the other magnet, and the rotation of the polishing piece is rotated. It has the effect of reversing the direction. As a result, the movement of the polishing piece or the stirring magnet piece is further increased, and the polishing effect is increased.

[0018]

FIG. 1 is a sectional view showing a polished state of one embodiment of the present invention, FIG. 2 is a sectional view taken along the line ii-ii of FIG. 1, and FIG. 3 is a sectional view taken along the line iii-iii of FIG. FIG. 4 is an exploded perspective view showing a frame and a polishing container.

Reference numeral 1 denotes a magnet disk, in which a bar-shaped permanent magnet 2 is buried, and rotates integrally with a center rotating shaft 3 driven by a motor (not shown) provided below. Reference numeral 4 denotes an outer wall made of a non-magnetic material, and 5 denotes a bottom plate also made of a non-magnetic material and provided on the magnet disk 1 with a slight gap therebetween. The upper part of the magnet disk 1 on the bottom plate 5 is a storage space 6, and the inner circumference is surrounded by a rubber material 7. Numeral 8 denotes another permanent magnet fixed to one end of the outer periphery of the storage space 6 on the bottom plate 5, which cuts off a part of the inner wall of the storage space in order to prevent the magnet disk 1 from being displaced by rotation. The part was inserted and fixed. 11 is a lid.

The magnetic disk 1 forms an even number of magnetic pole zones 9 as shown in FIG.
They were arranged so as to be sandwiched by magnetic pole zones 9 each consisting of a pole. The magnetic pole zone 9 is 2 to 4 in this embodiment.
Six strong rod magnets 10 made of rare earth magnets having poles at both ends were buried in one magnetic pole zone with the same pole facing the upper surface.

Reference numeral 12 denotes a container, which is a cylindrical container made of polypropylene in the present embodiment, and has a shape in which the diameter is enlarged above the small diameter portion 13 which is the main body to form a large diameter portion 14. The small diameter portion 13 can easily pass through the through hole 16 provided in the frame 15, and the large diameter portion 14
5 so as not to pass through. The length of the small diameter portion 13 substantially matches the length from the bottom of the storage space to the height at which the groove starts. Therefore, when the container 12 was inserted into the through hole 16 from the bottom, the container 12 stopped at the portion where the small diameter portion 13 changed to the large diameter portion 14, and the container 12 was suspended on the frame 15.

Reference numeral 17 denotes a collar provided on the outer periphery of the frame body. In this embodiment, the collar 17 passes through grooves 18 provided at four places of the storage space 6 and is locked at the groove bottom. As a result, the container does not move even if the magnet disk rotates on the lower surface. Container 12 is framed 15
It is preferable that the length of the small diameter portion in a state of being suspended in the container is such that the bottom of the container surely contacts the bottom plate 5. 19 is a lid of the container. The lid of the container may be a screw lid or a fitting lid as long as the contents do not spill due to some vibration. In the present embodiment, the diameter of the container itself is changed, but the diameter of the container may be the same, and the diameter of the lid may be such that it cannot pass through the through hole 16 of the frame 15.

In FIG. 1, reference numeral 20 denotes a polishing ball made of non-magnetic hard stainless steel having a diameter of 0.6 mm, and reference numeral 21 denotes a material to be polished. Reference numeral 22 denotes a stirring magnet that vigorously stirs the polishing ball 20;
Two were used. Further, the polishing was performed in a polishing liquid containing a small amount of a surfactant, a rust inhibitor and a polishing agent. Numeral 10 is a bubble generated at that time.

Since the stirring magnet 22 is placed in a strong magnetic field, when the magnet disk 1 is rotated by the motor, the container is pulled and rotated by the magnetic attraction force.
The frame 15 is fixed by the engagement, and the container 12 is prevented from moving. Therefore, the internal stirring magnet rotates violently, vigorously stirring the surrounding polishing balls 20, and the polishing target 21.
Were uniformly polished. Using a rotating disk having a diameter of about 30 cm and rotating it at 5000 RPM for about 1 hour, it was polished so that it could be used as it was.

[0025]

According to the present invention in which another permanent magnet is fixed to one end of the storage space, the conversion of the magnetic field by the rotation of the magnet disk becomes more complicated, and the disturbance and the rotational force of the polishing piece are extremely improved. In particular, the present invention has a remarkable effect when finishing polishing is performed using a large number of spherical polishing pieces and a stirring magnet.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along line ii-ii of FIG.

FIG. 3 is a sectional view taken along line iii-iii of FIG. 1;

FIG. 4 is an exploded perspective view showing a frame and a polishing container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnet disk 2 Bar magnet 3 Rotating shaft 5 Bottom plate 6 Storage space 7 Rubber material 8 Other permanent magnets 9 Magnetic pole zone 12 Container 13 Small diameter part 14 Large diameter part 15 Frame 16 Through hole 17 Collar 18 Groove 20 Polishing ball 21 Polishing Material 22 Stirring magnet

Claims (1)

(57) [Claims] An N-pole zone and an S-pole zone are alternately provided on the surface of a disk made of a non-magnetic material, a permanent magnet is buried in the N-pole zone with the upper surface being an N-pole, and an upper surface is embedded in the S-pole zone. A high-speed rotating magnet disk having permanent magnets embedded therein with an S pole is provided, and a container for accommodating a large number of polishing pieces made of a material to be polished and a magnetic material is placed on the disk. A polishing machine provided with a space, wherein another permanent magnet is fixed to a part of the outer periphery of the storage space so that only one of the poles is close to the space, and the polishing machine is magnetic.