JPH10249712A - Mirror decorating method with magnetic polishing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method (a mirror decorating method) of applying a pattern to the surface of a work, while mirror-machining the surface thereof, in a single process with magnetic polishing. SOLUTION: A mirror machining device has an iron core 12 magnetized for the opposed face to a plate work 11 to be a magnetic pole, magnetic abrasive grains 14 held between the iron core 12 and the work with the magnetic force of the iron core 12 and a magnetically decorating means 16 (a magnetic body 17 with a recess 17a) located facing the opposed force of the work to the iron core to partially change magnetic permeability between the work and the iron core. With the relative movement of the iron core 12 to the work 11, the surface of the work is magnetically polished and a pattern is applied thereto corresponding to the change of the magnetic permeability at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for decorating a mirror surface by magnetic polishing, and more particularly, to a method for decorating a mirror surface with a mirror-polished surface while magnetically polishing the surface.

[0002]

2. Description of the Related Art A magnetic polishing method is a polishing method utilizing a magnetic force. A polishing fluid in which solid magnetic abrasive grains and abrasive grains are mixed is supplied from the center of an iron core to be magnetized, and the solid magnetic abrasive grains are poled. A dry magnetic polishing method (for example, Japanese Patent Application Laid-Open No. 61-244457) in which an iron core is sucked and polished, and a mixture of a liquid abrasive and ferromagnetic particles (iron powder or the like) are supplied, and a ferromagnetic material is supplied to the iron core. There is a wet magnetic polishing method (for example, Japanese Patent Application Laid-Open No. 5-8169) in which a brush is formed by sucking powder particles, and an abrasive slurry is held between the magnetic powder particles for polishing.

FIG. 4 is a schematic view of a wet magnetic polishing method.
Magnetic polishing is performed using the abrasive particles 1 and the ferromagnetic substance particles 2 in the presence of a liquid medium 3 containing a surfactant. In this figure, 4 is a magnetic iron core which is a polishing tool, 5 is an object to be polished (work),
6 is a container.

Further, there has been proposed a magnetic polishing apparatus in which a magnetic material and a polishing liquid are separately supplied by different apparatuses so that a change or exchange of the magnetic material / polishing liquid can be easily performed (see, for example, Japanese Patent Application Laid-Open No. H11-157556). JP-A-8-323613.

[0005]

Conventionally, in order to apply a pattern on the surface of a work such as a stainless steel plate, the work is mirror-polished,
A pattern is processed on the surface by etching or the like. However, this method has a problem that a plurality of processes such as mirror polishing, etching, and post-processing such as chemical treatment are required.

The present invention has been made to solve such a problem. That is, an object of the present invention is to provide a method of applying a pattern on a surface of a work while mirror-finishing the surface in a single step using the above-described magnetic polishing method (referred to as a mirror surface decoration method). It is in.

[0007]

According to the present invention, there is provided an iron core magnetized so that a surface facing a plate-like work becomes a magnetic pole;
Magnetic particles to be held between the iron core and the work by the magnetic force of the iron core, and magnetic decoration means positioned opposite to the surface of the work opposite to the iron core and partially changing the magnetic permeability between the iron core and the work. The work surface is magnetically polished by the relative movement between the iron core and the work, and at the same time, a pattern corresponding to the change in the magnetic permeability is added.
A mirror surface decoration method by magnetic polishing is provided.

According to the method of the present invention, the magnetic decorating means partially changes the magnetic permeability between the plate-shaped work and the iron core, and changes the contact pressure between the magnetic particles and the work located therebetween. By doing so, a pattern corresponding to the change in magnetic permeability can be simultaneously applied to the surface of the work while mirror-finishing the surface of the work by magnetic polishing. By using magnetic abrasive grains as the magnetic particles, the workpiece can be magnetically polished by the contact pressure of the magnetic particles themselves, or magnetic polishing can be performed by holding an abrasive slurry between the magnetic particles.

According to a preferred embodiment of the present invention, the magnetic decorating means is made of a magnetic material having a depression corresponding to a desired pattern. With this configuration, it is possible to intentionally change the magnetic flux density and make a difference in the amount of polishing simply by placing a magnetic material (for example, a steel material) having irregularities below the plate to be polished.

According to another embodiment, the magnetic decorating means comprises a non-magnetic plate corresponding to a desired pattern, and a magnetic body for holding the non-magnetic plate between a work. With this configuration, it is possible to easily change the magnetic flux density intentionally and make a difference in the polishing amount simply by sandwiching a non-magnetic material (paper, plastic, or the like) between the work and the magnetic material.

Preferably, the plate-like work is made of a non-magnetic material. As the non-magnetic material, stainless steel, copper, plastic, ceramics, and the like can be applied.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. In addition, the same reference numerals are given to the common parts in the respective drawings, and the duplicate description will be omitted. FIG. 1 is a schematic view showing a mirror surface decoration method by magnetic polishing according to the present invention. As shown in this figure, the mirror surface decoration method of the present invention employs an iron core 12 magnetized so that the surface facing the plate-like work 11 becomes a magnetic pole.
And the magnetic particles 14 held between the magnetic core 14 and the work 11 by the magnetic force of the iron core 12, and the magnetic permeability between the iron core 12 and the surface opposite to the surface of the work 11 opposite the iron core is partially changed. A magnetic decoration means 16 is provided, and the surface of the work is magnetically polished by the relative movement between the iron core 12 and the work 11, and at the same time, a pattern corresponding to the change in the magnetic permeability is added. In this figure, reference numeral 13 denotes a coil, which magnetizes the iron core 12 by a DC power supply. Also, the coil 13
The iron core 12 is adapted to freely rotate about its axis. Further, the work 11 and the magnetic decoration means 1
6 and the iron core 12 relatively move horizontally in this figure.

FIG. 2 is an enlarged view of a portion A in FIG. As shown in this figure, the magnetic decorating means 16 comprises a magnetic body 17 having a recess 17a corresponding to a desired pattern. The magnetic body 17 is preferably iron or cobalt, or an alloy thereof which is a magnetic body. Further, the plate-like work 11 is preferably made of a non-magnetic material, for example, stainless steel, copper, plastic, ceramic, or the like. With this configuration, it is possible to vary the magnetic flux density of the lines of magnetic force indicated by broken lines by simply placing the magnetic material 17 (for example, a steel material) having irregularities below the plate material 11 to be polished, thereby providing a difference in the amount of polishing.

That is, in the portion of the work 11 that is in contact with the magnetic body 17 in the portion without the recess 17a, the magnetic flux density of the lines of magnetic force increases, the contact pressure between the work 11 and the magnetic particles 14 increases, and in the portion with the recess 17a, Conversely, the magnetic flux density becomes weak, and the contact pressure between the work 11 and the magnetic particles 14 becomes small. Therefore, by using magnetic abrasive grains as the magnetic particles 14, the work 11 can be magnetically polished with the contact pressure of the magnetic particles themselves, or the abrasive can be magnetically polished by holding an abrasive slurry between the magnetic particles. While the surface of the work is mirror-finished by magnetic polishing, a pattern corresponding to the change in magnetic permeability can be simultaneously formed on the surface.

FIG. 3 is a view similar to FIG. 2 showing another embodiment. In this figure, the magnetic decorating means 16 includes a non-magnetic plate 18 corresponding to a desired pattern, and a magnetic body 17 which sandwiches the non-magnetic plate 18 between the work 11. Magnetic body 17
Is similar to FIG. 2 except that there is no dent on the surface.
The non-magnetic plate 18 is, for example, paper, plastic, or an appropriate paint, and is configured to partially change the magnetic permeability between the plate-like work 11 and the iron core 12. Other configurations are the same as those in FIGS.

With this configuration, the work 11 and the magnetic body 17
By simply holding the non-magnetic material 18 (paper, plastic, etc.) between them, it is possible to easily change the magnetic flux density intentionally and make a difference in the polishing amount.

According to the above-described method, the magnetic decorating means 16 partially changes the magnetic permeability between the plate-like work 11 and the iron core 12, and the magnetic particles 14 and the work 1 located between them are changed.
By changing the contact pressure with the magnetic head 1, a pattern corresponding to the change in the magnetic permeability can be simultaneously applied to the surface of the work surface in a single step while the surface of the work is mirror-finished by magnetic polishing.

[0018]

EXAMPLE A steel plate having a thickness of 13 mm was placed under a stainless steel plate and subjected to magnetic polishing by the method of the present invention. The steel plate was provided with a through hole of φ12, 10, 8, 6, 4, 2 mm and a hole of the same diameter with a depth of 5 mm. As a result, a mirror surface in which the shape of the back surface of the stainless steel plate was embossed was obtained on the surface, and the surface roughness was 0.1 μmRmax. The shape after polishing was slightly raised at the circumferential portion and depressed at the central portion. It is considered that the depression in the center portion due to the processing pressure despite the decrease in the magnetic flux density in the center portion.

From this example, it was confirmed that it was possible to obtain a mirror surface reflecting the change in the magnetic flux density on the back surface of the plate (the change in the shape of the steel plate). It turned out to be possible.

It should be noted that the present invention is not limited to the above-described embodiments and examples, and it is needless to say that various modifications can be made without departing from the spirit of the present invention. Further, the magnetic polishing means for applying the method of the present invention may be dry or wet.

[0021]

As described above, the mirror surface decoration method by magnetic polishing of the present invention is a single step using magnetic polishing method.
This has a novel and excellent effect that a pattern can be applied to the surface of the work while mirror-finishing the surface.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a mirror surface decoration method by magnetic polishing according to the present invention.

FIG. 2 is an enlarged view of a portion A in FIG.

FIG. 3 is a diagram showing another embodiment of the present invention.

FIG. 4 is a schematic view of a conventional magnetic polishing method.

[Explanation of symbols]

 Reference Signs List 1 abrasive particles 2 ferromagnetic substance particles 3 liquid medium 4 polishing tool (magnetic iron core) 5 object to be polished (work) 6 container 11 plate-like work 12 iron core 14 magnetic particles 16 magnetic decorating means 17 magnetic body 17a recess 18 Non-magnetic plate

Claims (4)

[Claims] 1. An iron core magnetized so that a surface facing a plate-like work becomes a magnetic pole, magnetic particles held between the work by the magnetic force of the iron core, and a surface of the work opposite to the iron core. Magnetic decoration means for partially changing the permeability between the iron core and the iron core.The workpiece surface is magnetically polished by the relative movement between the iron core and the work, and at the same time, the change in the magnetic permeability is supported. A decorative pattern by magnetic polishing, characterized by adding a patterned pattern. 2. The mirror surface decoration method according to claim 1, wherein the magnetic decoration means is made of a magnetic material having a recess corresponding to a desired pattern. 3. The magnetic decorating device according to claim 1, wherein the magnetic decorating means comprises a non-magnetic plate corresponding to a desired pattern, and a magnetic body sandwiching the non-magnetic plate between the workpiece. Mirror decoration method. 4. The method according to claim 1, wherein the plate-like work is made of a non-magnetic material.