JP3384507B2 - Processing method of mirror material with micro holes - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing a mirror-finished material having fine holes and a rolling roll used for the same. More specifically, it has good lubricity in press working and has a regular but apparently mirror surface. The present invention relates to a method for processing a mirror surface material having fine concave holes.

[0002]

2. Description of the Related Art Thin plate materials (for example, steel plates) used for forming outer plates of automobile bodies and exterior plates of household electric appliances.
In particular, it is important that the diffused reflection on the painted surface is small and the gloss is excellent, and the distortion of the image is small and the image clarity is excellent. I am calling it.

Conventionally, in order to improve seizure resistance and the like during press forming, a rough surface is generally formed on the surface of a steel sheet by using a rolling roll dull-finished by a shot blast method or an electric discharge machining method. ing. However, the roughening treatment causes the steel plate surface to have a rough surface composed of irregular peaks and valleys, and even if painting is performed on this surface, a coating film is only formed between the peaks and valleys and the surface is horizontal. Few coatings,
As a result, there is a problem that the sharpness deteriorates the image clarity.

In order to solve such a problem, a laser beam is converted into a pulse beam by a chopper, which is focused through a lens on the surface of a rotating rolling roll,
A processing means has been proposed in which the condensing part of the roll is instantaneously heated and melted to form a pool of molten metal, and the molten pool is formed into a concave shape by the pressure of the assist gas blown obliquely from the side of the laser beam and cooled. (For example, JP-A-62-168602 and JP-A-62-2).
24405).

[0005]

However, Japanese Patent Application Laid-Open No. 62-
No. 168602 and Japanese Patent Laid-Open No. 62-224405 cannot sufficiently control the shape of the protrusion that effectively works during rolling, and when a material having a mirror surface on this rolling roll (hereinafter, mirror surface material) is rolled, There is a problem that the concave holes that effectively act on lubrication are not efficiently formed. Therefore, it is difficult to retain the lubricating oil on the surface of the mirror surface material when the mirror surface material (product) is pressed, and there is a problem of poor lubricity in the press processing.

The present invention was devised to solve such problems. That is, an object of the present invention is to process a mirror-finished material having good lubricity in press working and not spoiling excellent characteristics as a mirror surface (gloss, image clarity), but having an apparently mirror surface but having regular fine holes. To provide the law.

[0007]

According to the present invention, a cemented carbide
A large number of minute recessed holes (2) spaced apart from each other are formed on the surface of the gold flat tool (1), and the outer surface of the rolling roll (3) is spaced from each other corresponding to the recessed holes by the coining of the tool. Forming a convex portion (4) separated from each other and rolling the mirror surface material (5) with the rolling roll to form a large number of fine recessed holes on the surface. Processing methods are provided.

According to a preferred embodiment of the present invention, the large number of minute concave holes (2) are independently formed at regular intervals and the convex portions (4) corresponding to the concave holes are formed. The plurality of minute recessed holes (6) are independently formed at regular intervals. Further, the formation of the concave hole of the cemented carbide flat tool (1) is performed by ion beam processing.

[0009]

According to the method of the present invention described above, since a large number of minute projections (4) spaced apart from each other are formed on the outer surface of the rolling roll, the rolling roll produces a material having a mirror surface (mirror surface). By rolling the material, a large number of fine concave holes can be formed on the surface of the mirror surface material. Therefore, when the mirror surface material (product) is pressed, the lubricating oil can be retained in the concave hole on the surface of the mirror surface material, and the lubricity in the press processing can be improved. In addition, since the large number of minute concave holes (2) are independently formed at regular intervals and the convex portions (4) corresponding to the concave holes are formed, the material having a mirror-finished surface by the rolling roll. By rolling the (mirror surface material), it is possible to form a large number of minute recesses (6) that are independent of each other at substantially constant intervals on the surface of the mirror surface material. Therefore, when pressing such a mirror surface material (product), the lubricating oil can be retained in the concave hole (6) on the surface of the mirror surface material, and the lubricity in the press processing can be improved.

According to a preferred embodiment of the present invention,
By forming a concave hole in the cemented carbide flat tool by ion beam processing, transfer it to the rolling roll by coining, by rolling with this rolling roll, a minute concave hole (for example, diameter, (About 50 μm or less, center-to-center distance, about 150 μm or less) can be efficiently formed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram schematically showing a method of processing a mirror-finished material having fine holes according to the present invention. Referring to FIG. 1, the method of the present invention includes a first step 10 of forming a large number of minute concave holes 2 spaced from each other on a surface of a cemented carbide flat tool 1.
And a second step 12 of forming convex portions 4 corresponding to the concave holes 2 and spaced apart from each other on the outer surface of the rolling roll 3 by the coining of the tool 1, and the mirror surface material 5 is rolled by the rolling roll 3. The third step 14 of forming a large number of fine recessed holes 6 on the surface thereof. In addition, in this example, a large number of minute concave holes 2 are independently formed with a constant interval therebetween, and a convex portion 4 corresponding to this concave hole is formed, and a large number of minute concave holes 6 are formed at a constant interval. To be formed independently. In the first step 10 of FIG. 1, the minute concave holes 2 of the cemented carbide flat tool 1 are formed by ion beam processing. That is,
In FIG. 1, a cemented carbide flat tool 1 is placed in a vacuum chamber.
And the ion beam 8 is irradiated through the fine holes of the mask 7. By such ion beam processing, the irradiation position of the ion beam 8 can be removed (atomic sputter removal processing) on the order of atoms and molecules, and a large number of minute concave holes 2 can be formed without heat generation at the irradiation position. You can The first step 12 of the present invention is not limited to ion beam processing, but may be electron beam processing, laser etching, or the like. Further, the cemented carbide flat tool 1 is made of a high hardness material such as tool steel (for example, WC-
It is preferable to use Co) for the surface, and to mirror-finish the surface in advance and to perform sufficient hardening treatment.

Next, in the second step 12 of FIG. 1, the rolling roll 3 is rotated while being pressed against the tool 1,
A convex portion 4 corresponding to the concave hole 2 is formed on the outer surface of the rolling roll 3 by coining, and further, in a third step 14, the mirror surface material 5 is rolled by the rolling roll 3.

FIG. 2 is a schematic view showing an enlarged part A of FIG. The rolling roll 3 used in the method of the present invention has a large number of fine convex portions 4 spaced from each other on the outer surface as shown in FIG. Protrusions 4 of the rolling rolls 3, is formed by coining a cemented carbide flat tool 1 having a large number of fine concavities 2 spaced from each other, concavity 2 of cemented carbide plane tool 1 ion beam processing Formed with a diameter of about 50μ
m or less and the center-to-center distance is preferably about 150 μm or less, more preferably the maximum diameter is about 30 μm and the center-to-center distance is about 130 μm. As shown in FIG. 2, the concave holes 6 may be rolled on both surfaces of the mirror-like material 5,
Alternatively, it may be processed on only one side.

According to the above method of the present invention, the rolling roll 3
Since a large number of minute convex portions 4 spaced from each other are formed on the outer surface of the, the surface of the mirror-finished material 5 is rolled by rolling the material whose surface is mirror-finished (mirror-finished material 5) with this rolling roll 3. A large number of fine recessed holes 6 can be formed. Therefore, when pressing such a mirror surface material 5 (product),
Lubricating oil can be retained in the concave holes 6 on the surface of the mirror surface material, and the lubricity in the press working of the mirror surface material can be improved. In addition, since a large number of minute concave holes 2 are independently formed at regular intervals and the convex portions 4 corresponding to the concave holes are formed, a material having a mirror surface (mirror surface material) is formed by this rolling roll. By rolling, it is possible to form a large number of independent fine concave holes 6 on the surface of the mirror-finished material at substantially regular intervals. Therefore, such mirror surface material (product)
When press working, the lubricating oil can be retained in the concave holes 6 on the surface of the mirror surface material, and the lubricity in the press working can be enhanced.

According to a preferred embodiment of the present invention,
A concave hole 2 is formed in a cemented carbide flat tool by ion beam processing, this is transferred to a rolling roll 3 by coining, and rolling is performed by this rolling roll 3 to form a fine concave hole 6 in a mirror surface material having a large area. (For example, the diameter is about 50 μm or less,
The center-to-center distance, about 150 μm or less) can be efficiently formed.

FIG. 3 is an enlarged view of the surface of the cemented carbide flat tool 1 having a mirror surface manufactured by the method of the present invention. In this figure, (A) and (B) are the surfaces of the same cemented carbide flat tool, (A) shows a case of 200 times, and (B) shows a case of 100 times. The short horizontal line (black line) in the figure is 100.
The length of μm is shown. WC- which is a super hard material for the material of the tool
A concave hole was formed by ion beam processing using Co using a suitable mask. As is clear from this figure, the diameter of the concave holes is about 30 μm, and the center-to-center distance is about 1 μm.
It was 30 μm. Also, although it is not clear from this figure, when visually inspecting this cemented carbide flat tool without enlarging it, it is not possible to distinguish it from a mirror surface with no concave holes at all,
Although it is a mirror surface in appearance, it has regular fine irregularities.

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0018]

As described above, the method for processing a mirror surface material having fine holes according to the present invention has good lubricity in press working and does not impair the excellent characteristics (gloss, image clarity) as a mirror surface. Although it is apparently a mirror surface, it has an excellent effect that a mirror surface material having regular fine holes can be processed.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a processing method of a mirror surface material having microscopic holes according to the present invention.

FIG. 2 is a schematic view showing an enlarged part A of FIG.

FIG. 3 is an enlarged view of the surface of a cemented carbide flat tool manufactured by the method of the present invention.

[Explanation of symbols]

1 Cemented Carbide Flat Tool 2 Tool Cavity 3 Rolling Roll 4 Convex 5 Mirror Surface Material (Product) 6 Mirror Surface Cavity 7 Mask 8 Ion Beam 10 First Step 12 Second Step 14 Third Step

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B21B 1/00-11/00 B21B 27/00 B23K 15/00 B23K 15/08

Claims (3)

(57) [Claims] 1. A surface of a cemented carbide flat tool (1) is provided with a large number of minute recessed holes (2) spaced apart from each other, and the impression of the tool is applied to the outer surface of a rolling roll (3), Forming convex portions (4) corresponding to the concave holes and spaced from each other, and rolling the mirror surface material (5) by the rolling roll to form a large number of fine concave holes (6) on the surface; A method for processing a mirror surface material having fine holes. 2. The large number of minute recessed holes (2) are independently formed at regular intervals and a convex portion (4) corresponding to the recessed holes is formed, and the large number of minute recessed holes are formed. 2. The method for processing a mirror-finished material having microscopic holes according to claim 1, wherein (6) are independently formed at a constant interval. 3. The method for processing a mirror-finished material having fine holes according to claim 1 or 2, wherein the concave holes of the cemented carbide flat tool (1) are formed by ion beam processing.