JPH07265906A - Working method for mirror finished material having fine hole and rolling roll therefor - Google Patents

Abstract

PURPOSE:To provide a working method for a mirror finished surface good at lubricity in press working, not impairing the excellent property as mirror finished surface (brightness, image clarity), having apparent mirror finished surface but fine hole therein and to provide a rolling roll used therefor. CONSTITUTION:Many fine recessed holes 2 apart each other in an interval are formed on the surface of a sintered hard alloy tool 1, by coining of the tool, a projecting part 4 corresponding to the recessed part 2 is transferred on the outer surface of a rolling roll 3, by the rolling roll, a mirror finished material 5 is rolled so as to form many fine recessed parts on the surface. The recessed hole 2 in the sintered hard alloy tool 1 is formed by ion beam machining, a diameter of which is about <=50mum.

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 and a rolling roll used for this processing.

[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-62-168602).
No. 224405).

[0005]

However, Japanese Patent Laid-Open No. 62-62
No. 168602 and JP-A No. 62-224405 cannot sufficiently control the shape of the protrusion that effectively acts 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 provide a mirror-finished material having good lubricity in press working and excellent mirror-finishing characteristics (gloss, sharpness) without apparently being a mirror surface but having regular fine holes. It is to provide a processing method and a rolling roll used for the processing method.

[0007]

According to the present invention, a large number of minute recessed holes spaced apart from each other are formed on the surface of a cemented carbide tool, and the recesses are formed on the outer surface of the rolling roll by the coining of the tool. A method for processing a mirror-finished material having fine holes, characterized in that a convex portion corresponding to a hole is formed, and the mirror-finished material is rolled by the rolling roll to form a large number of fine recessed holes on the surface. To be done. According to a preferred embodiment of the present invention, the formation of the concave hole in the cemented carbide tool is performed by ion beam machining.

Further, according to the present invention, there is provided a rolling roll for processing a mirror-finished material having fine holes, characterized in that it has a large number of fine convex portions spaced apart from each other on its outer surface. According to a preferred embodiment of the present invention, the projections of the rolling roll are formed by coining a cemented carbide tool having a large number of minute recesses spaced apart from each other, and the recesses are formed by ion beam processing. And the diameter is about 50 μm or less.

[0009]

According to the above-described method and apparatus of the present invention, a large number of minute convex portions spaced apart from each other are formed on the outer surface of the rolling roll, so that the rolling roll has a mirror-finished surface (mirror surface material). A large number of fine recessed holes can be formed on the surface of the mirror surface material by rolling. 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.

According to a preferred embodiment of the present invention,
By forming a concave hole in the cemented carbide tool by ion beam processing,
This is transferred to a rolling roll by coining, and by rolling with this rolling roll, fine concave holes (for example, diameter, about 50 μm or less, 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 comprises a first step 10 of forming a large number of minute recessed holes 2 spaced from each other on the surface of a cemented carbide tool 1.
The second step 12 of forming the convex portion 4 corresponding to the concave hole 2 on the outer surface of the rolling roll 3 by the imprinting of the tool 1, and the mirror surface material 5 is rolled by the rolling roll 3 to form a large number of fine concaves on the surface. And a third step 14 of forming the holes 6. In the first step 10 of FIG. 1, the fine recessed holes 2 of the cemented carbide tool 1 are formed by ion beam processing. That is, in FIG. 1, the cemented carbide tool 1 is held in a vacuum chamber, and the ion beam 8 is passed through the fine holes of the mask 7.
Irradiate. 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 tool 1 has a high hardness material such as tool steel (for example, WC-C).
It is preferable that the surface is mirror-finished in advance and the surface is subjected to sufficient curing 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. The convex portion 4 of the rolling roll 3 has a plurality of minute concave holes 2 spaced apart from each other, and thus the cemented carbide tool 1
It is preferable that the concave hole 2 of the cemented carbide tool 1 is formed by ion beam processing, the diameter is about 50 μm or less, the center-to-center distance is about 150 μm or less, and the maximum diameter is about 30 μm. Distance between centers is about 130
More preferably, it is μm. In addition, as shown in FIG.
The concave holes 6 may be rolled on both surfaces of the mirror-finished material 5, or may be processed on only one surface. Further, the fine holes (recessed holes) in the present invention may be recesses (recesses) having a bottom like the recessed holes 6 in FIG. 2 or may be through holes.

According to the method and apparatus of the present invention described above, since a large number of minute convex portions 4 spaced from each other are formed on the outer surface of the rolling roll 3, the rolling roll 3 has a mirror-finished surface ( By rolling the mirror-finished material 5), a large number of fine recessed holes 6 can be formed on the surface of the mirror-finished material 5. Therefore, when the mirror surface material 5 (product) is pressed, 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 processing of the mirror surface material can be improved.

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

FIG. 3 is an enlarged surface view of the cemented carbide 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 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 indicates a length of 100 μm. WC-Co, which is a superhard material, was used as the material of the tool, and a concave hole was formed by ion beam processing using a suitable mask. As is clear from this figure, the maximum diameter of the concave holes is about 30 μm, and the center-to-center distance is about 130 μm.
was μm. Further, although it is not clear from this figure, when this cemented carbide tool was visually inspected without enlarging it, it could not be distinguished from a mirror surface with no recessed holes, and it was apparently a mirror surface, but with regular fine particles. It has 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 of the present invention and the rolling roll used therefor have good lubricity in press working and excellent characteristics as a mirror surface (gloss, sharpness). It has an excellent effect that a mirror surface material having an apparently mirror surface but having regular fine holes can be processed without deteriorating the property).

[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 a surface enlarged view of a cemented carbide tool manufactured by the method of the present invention.

[Explanation of symbols]

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

Claims (4)

[Claims] 1. A plurality of minute concave holes spaced apart from each other are formed on the surface of a cemented carbide tool, and convex portions corresponding to the concave holes are formed on the outer surface of a rolling roll by coining the tool. A method for processing a mirror-finished material having fine holes, characterized in that the mirror-finished material is rolled by the rolling roll to form a large number of fine recessed holes on the surface. 2. The method for processing a mirror-finished material having fine holes according to claim 1, wherein the concave holes of the cemented carbide tool are formed by ion beam processing. 3. A roll for processing a mirror-finished material having fine holes, characterized in that it has a large number of fine projections spaced apart from each other on its outer surface. 4. The convex portion of the rolling roll is formed by coining a cemented carbide tool having a large number of minute concave holes spaced apart from each other, the concave holes being formed by ion beam processing, and having a diameter of about It is 50 micrometers or less, The rolling roll for mirror surface material processing which has the fine hole of Claim 3 characterized by the above-mentioned.