JP7296112B2 - Concave-convex transfer method - Google Patents

Description

The present invention relates to a concavo-convex transfer method.

Patent document 1 discloses a conventional press working die. This press working die is used for coining (coining). In this press working mold, unevenness having a desired shape to be transferred to a metal workpiece is formed on the surface of the mold. Metal molds used for coining fine unevenness on the processed surface of a metal workpiece are generally processed by cutting, die-sinking electric discharge machining, laser processing, electron beam processing, etching, etc. Unevenness is formed.

JP 2009-172612 A

However, the process of forming fine irregularities on the mold is expensive and requires a long process time. In this way, using a mold with fine unevenness to form fine unevenness on a metal work piece increases the processing cost of the mold, making it unsuitable for high-mix low-volume production. not On the other hand, when a mold with fine unevenness formed is used for mass production, the wear of the fine unevenness of the mold progresses, and the mold must be periodically corrected and renewed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a concavo-convex transfer method capable of inexpensively forming high-definition, high-precision concavities and convexities on a metal workpiece. It is an issue that should be addressed.

In the unevenness transfer method of the present invention, convex portions are formed on the surface of a soft material using a coloring agent containing a pigment, and the surface of the soft material on which the convex portions are formed using the coloring agent and the processed surface of a metal workpiece. are stacked and pressurized to form unevenness on the processed surface of the workpiece.

This uneven transfer method makes it possible to easily form protrusions on the surface of a soft material using a colorant containing a pigment. In particular, since the convexes are formed with a colorant containing a pigment, it is possible to easily form fine unevenness in a desired shape on the surface of the soft material. Therefore, this concavo-convex transfer method can reduce the manufacturing cost even if it is used for high-mix low-volume production. In addition, according to this unevenness transfer method, when the unevenness of the soft material is worn, a soft material having the same unevenness can be easily manufactured. The coloring agent containing the pigment in the present invention is a solid such as toner or a liquid such as ink, and can be used for printing with a laser printer, an inkjet printer, or the like.

Therefore, the concavo-convex transfer method of the present invention can form high-definition, high-precision concavities and convexities on a metal workpiece at low cost.

FIG. 2 is a schematic diagram when applied to press working in Example 1; (a) is the concentric circle pattern of Example 1, and (b) is a photograph of the concentric circle pattern printed on the soft material. (a) is a three-dimensional surface image showing a part of the concentric circle pattern printed on the PET film, and (b) is its cross-sectional shape. It is a surface photograph of the 1st test piece which transferred unevenness|corrugation using various soft materials. It is a surface photograph of the 2nd test piece which transferred unevenness|corrugation using various soft materials. It is a surface photograph which shows the measurement position and measurement length of the 2nd test piece which transferred unevenness|corrugation. It is a cross-sectional shape of each measurement part of the second test piece pressurized with each average pressure to form unevenness. It is a cross-sectional shape of the third test piece pressurized with each average pressure and unevenness is formed. FIG. 10 is a schematic view of the rolling process of Example 2; 4 is a photograph showing a pure aluminum material to which irregularities are transferred by rolling. FIG. 11 is a schematic view of the case when applied to the rolling process of Example 3;

A preferred embodiment of the present invention will be described.

In the unevenness transfer method of the present invention, the surface of the soft material on which the protrusions are formed by the coloring agent and the processed surface of the work material are overlapped, and the soft material and the work material are sandwiched between metal molds and pressed. You can press. In this way, the unevenness transfer method of the present invention can be applied to press working.

In the unevenness transfer method of the present invention, the surface of the soft material on which the convex portions are formed by the coloring agent and the processed surface of the work material are overlapped, and the soft material and the work material are placed between a pair of rolls. It may be pressurized by being passed through. Thus, the unevenness transfer method of the present invention can be applied to rolling.

In the unevenness transfer method of the present invention, the workpiece having a cylindrical outer shape is sandwiched between a pair of molds, and convex portions are formed by the coloring agent on the surface of at least one of the molds facing the workpiece. The formed soft material is held with the surface facing the work material, and the work material may be rotated and pressed by relatively moving the pair of molds. In this way, the unevenness transfer method of the present invention can be applied to rolling. Here, the term "cylindrical outer shape" includes not only a cylindrical workpiece but also a cylindrical workpiece with a metal core inserted into the central space.

Next, Examples 1 to 3 embodying the concavo-convex transfer method of the present invention will be described with reference to the drawings.

<Example 1>
The concavo-convex transfer method of Example 1 is applied to press working using a parallel plate mold 10 made of metal, as shown in FIG. The parallel plate mold 10 corresponds to a pair of molds. In this concavo-convex transfer method, first, by printing on the surface of the soft material 20 with a laser printer, the convex part 30 having a desired shape is formed on the surface of the soft material 20 . Then, the surface of the soft material 20 and the processed surface of the metal workpiece 40 are overlapped, the soft material 20 and the workpiece 40 are sandwiched between the parallel plate molds 10, and pressed in the direction of the arrow F by a press machine or the like. , to transfer unevenness to the workpiece.

Experiments were conducted on the influence of the type of the soft material 20 and the influence of the applied pressure in the concavo-convex transfer method applied to press working. The contents are explained below.

As the soft material 20, five types of plain paper, Kent paper, coated paper (ream weight 90 kg, 135 kg), and polyethylene terephthalate (PET) film were used. With a laser printer, a pattern of concentric circles with a maximum circle diameter of 36 mm and an interval of 1.2 mm was printed on the surface of each soft material, as shown in FIGS. 2(a) and (b). Toner in a laser printer corresponds to a pigmented colorant. As shown in FIGS. 3A and 3B, lines printed by a laser printer form convex portions 30 . The convex portion 30 has an average thickness of 5.6 μm and an average width of 305 μm.

A test piece as the metal workpiece 40 is a pure aluminum (A1050-O) material with an initial plate thickness of 1 mm and a diameter of 36 mm. As for the initial surface of this test piece, the one where the rolling marks remained was used. The arithmetic mean roughness Ra of the machined surface of this test piece is 0.23 μm. Specimens were used after ultrasonic cleaning in acetone.

A metallic parallel plate mold 10, which is a mold, has a diameter of 60 mm and a height of 25 mm, is mirror-finished, and is coated with TiCN (titanium carbonitride). The material is alloy tool steel (SKD11). This parallel plate mold 10 was pressed by an Amsler universal testing machine.

The surface of each soft material 20 printed with a concentric circle pattern by a laser printer was pressed against the processed surface of the first test piece having a diameter-to-thickness ratio (diameter/thickness) of 24 at an average pressure of 295 MPa. . FIG. 4 shows a microscopic photograph of the first test piece having the unevenness transferred to the processed surface in this manner. In FIG. 4, the left side is the center of the first test piece and the right side is the edge of the first test piece. A concentric pattern can be confirmed when any soft material is used. In particular, a PET film having a smooth surface in a non-printing portion is used in which unevenness can be observed remarkably.

In addition, the surface of each soft material 20 having a concentric circle pattern printed on the surface by a laser printer was applied to the processed surface of the second test piece having a diameter-to-thickness ratio (diameter/thickness) of 36 at an average pressure of 295 MPa. pressured. FIG. 5 shows a microphotograph of the second test piece having the unevenness transferred to the processed surface in this manner. In FIG. 5, the left side is the center of the second test piece and the right side is the edge of the second test piece. A concentric pattern can be confirmed when any soft material is used. In particular, a PET film having a smooth surface in a non-printing portion is used in which unevenness can be observed remarkably.

Next, the processed surface of the second test piece with a diameter-to-thickness ratio (diameter/thickness) of 36, and the processing of the third test piece with a diameter-to-thickness ratio (diameter/thickness) of 12 The surface of the PET film, on which a concentric circle pattern was printed by a laser printer, was pressed against the surface with different pressures.

As shown in FIG. 6, the unevenness of the second test piece after transfer was measured at three points: the central portion (A), the intermediate portion (B), and the end portion (C). The central portion (A) is a straight line extending radially from the center to a position 3 mm away. The intermediate portion (B) and the end portions (C) are located on extensions of the central portion (A). The distance between the central portion (A) and the middle portion (B) and the distance between the middle portion (B) and the end portion (C) are 4.5 mm. Moreover, the measured width of the intermediate portion (B) and the end portion (C) is 3 mm.

FIG. 7 shows the three uneven shapes of the second test piece when pressurized at each average pressure of 51.1 MPa, 98.7 MPa, 147.9 MPa, 197.0 MPa, 246.6 MPa, and 299.6 MPa. . At an average pressure of 51.1 MPa, although the unevenness in the central portion is not clear, the unevenness becomes visible as the end portions are approached. Even if the average pressure is increased, there is a tendency that the unevenness at the end (C) can be transferred relatively clearly compared to the central area (A). height is almost unchanged.

FIG. 8 shows the concave-convex shape of the third test piece when pressed at average pressures of 36.0 MPa, 71.0 MPa, 106.4 MPa, and 138.7 MPa. As with the second test piece described above, it can be seen that the unevenness is transferred more clearly at the end than at the center. Also, it can be seen that the unevenness tends to be clearly transferred as the average pressure increases. At 106.4 MPa or more, unevenness is distributed relatively uniformly.

The average pressure at which the unevenness can be transferred as a whole is about 200 MPa for the second test piece and about 100 MPa for the third test piece, and the smaller the ratio of the diameter to the thickness (diameter/thickness), the better. average pressure becomes smaller. In the same manner as in general coining, even in this unevenness transfer method, unevenness can be transferred if the material to be processed is in a stress state that allows plastic flow. Since plastic flow is affected by friction with the mold, introducing a lubricant to the interface between the mold and the workpiece or soft material facilitates the plastic flow of the workpiece, even at low average pressure. I think that unevenness can be transferred.

<Example 2>
The concavo-convex transfer method of Example 2 is applied to rolling as shown in FIG. In this uneven transfer method, first, the surface of the PET film 120, which is a soft material, is printed with a laser printer to form the protrusions 130 having a desired shape on the surface of the PET film 120. FIG. Then, the surface of the PET film 120 and the processing surface of the metal workpiece 140 are overlapped, and the PET film 120 and the workpiece 140 are passed between a pair of rolls 110 and pressed to press the workpiece 140. The unevenness is transferred to the workpiece 140 by plastic deformation.

A lattice pattern with a pitch of 1 mm was printed on the surface of the PET film 120 with a laser printer. Toner in a laser printer corresponds to a pigmented colorant. The metal work piece 140 is a pure aluminum (A1050-O) material with a width of approximately 30 mm and a length of approximately 80 mm. Each roll 110 is chromium-molybdenum steel, 43 mm in diameter, and ground. FIG. 10 shows the appearance of the surface of the workpiece 140 rolled at a rolling reduction of about 5%. It can be seen that the lattice pattern can be transferred over the entire surface area of the workpiece 140 .

<Example 3>
The concavo-convex transfer method of Example 3 is applied to rolling as shown in FIG. In this uneven transfer method, first, by printing on the surface of the soft material 220 with a laser printer, the protrusions 230 having a desired shape are formed on the surface of the soft material. Toner in a laser printer corresponds to a pigmented colorant. A metal workpiece 240 having a cylindrical outer shape is sandwiched between the parallel plate molds 210 . The parallel plate mold 210 corresponds to a pair of flat plate molds. A soft material 220 having convex portions 230 formed thereon is held on each of the opposing surfaces of the parallel plate mold 210 with the surface facing the workpiece 240 side. By relatively moving the parallel plate molds 210 in the directions of arrows M1 and M2, the material to be processed is rotated and pressed from the directions of arrows F1 and F2 to transfer unevenness to the outer peripheral surface of the material to be processed 240. do.

As described above, according to the concavo-convex transfer method of Examples 1 to 3, the convex portions 30, 130, 230 are formed by toner on the surfaces of the soft materials 20, 120, 220 using a laser printer. The surfaces of the soft materials 20, 120, 220 on which the projections 30, 130, 230 are formed by toner and the processed surfaces of the metal workpieces 40, 140, 240 are superimposed and pressed together to form the workpieces 40, 140. , 240 to form unevenness.

This concavo-convex transfer method can easily form the convex portions 30, 130, and 230 with toner. In particular, since the convex portions 30, 130, 230 are formed by toner, fine unevenness can be easily formed on the surface of the soft materials 20, 120, 220 in a desired shape. Therefore, this concavo-convex transfer method can reduce the manufacturing cost even if it is used for high-mix low-volume production. Further, if the unevenness of the soft materials 20, 120, 220 is worn, the soft materials 20, 120, 220 having the same unevenness can be easily manufactured.

Therefore, the concavo-convex transfer methods of Examples 1 to 3 can form high-definition, high-precision concavities and convexities on metal workpieces 40, 140, and 240 at low cost.

In the unevenness transfer method of the first embodiment, the surface of the soft material 20 on which the protrusions 30 are formed by toner overlaps the processed surface of the material 40 to be processed, and the soft material 20 and the material to be processed 40 are sandwiched between the parallel plate molds 10 . Pressurize with . Thus, this concavo-convex transfer method can be applied to press working.

In the unevenness transfer method of the second embodiment, the surface of the soft material 120 on which the protrusions 130 are formed by toner and the processed surface of the material 140 to be processed are overlapped, and the soft material 120 and the material to be processed 140 are placed between a pair of rollers. Pass through and pressurize. Thus, this concavo-convex transfer method can be applied to rolling.

In the unevenness transfer method of the third embodiment, a metal workpiece 240 having a cylindrical outer shape is sandwiched between the parallel plate molds 210, and the projections 230 are formed by toner on the surface of the parallel plate mold 210 on the workpiece 240 side. A soft material 220 having a surface facing the workpiece 240 is held, and the workpiece 240 is rotated and pressed by relatively moving the parallel plate mold 210 . Thus, this concavo-convex transfer method can be applied to rolling.

The present invention is not limited to Examples 1 to 3 explained by the above description and drawings, and the following examples are also included in the technical scope of the present invention.
(1) The soft materials of Examples 1 to 3 can form convex portions with a colorant containing pigments, even if they are other than plain paper, Kent paper, coated paper, and PET film, and the convex portions can be formed when pressurized. Any material can be used as long as the shape of the portion can be maintained.
(2) In Examples 1 to 3, the colorant was toner, but it may be ink containing pigment. In this case, ink containing a pigment may be printed on the soft material using an inkjet printer.
(3) In Examples 1 and 2, the surface of the soft material on which the protrusions were formed was superimposed on one side of the work material and pressed to transfer the unevenness to one side of the work material. It is also possible to transfer unevenness to both surfaces of the material to be processed at one time by overlapping the surfaces on which convex portions of the soft material are formed on both surfaces and applying pressure.
(4) In Example 3, the workpiece was held on each of the opposing surfaces of the parallel plate mold. The workpiece may be held facing the workpiece.

10, 210... Parallel plate type (mold)
DESCRIPTION OF SYMBOLS 20,120,220... Soft material 30,130,230... Convex part 40,140,240... Work material 110... Roll

Claims (4)

A convex portion is formed by a coloring agent containing a pigment on the surface of the soft material,
A concavo-convex transfer method for forming concavities and convexities on the processed surface of the workpiece by overlapping and pressing the surface of the soft material on which convex portions are formed with the coloring agent and the processed surface of the metallic workpiece. 2. The method according to claim 1, wherein the surface of the soft material on which the convex portions are formed by the coloring agent and the processed surface of the material to be processed are overlapped, and the soft material and the material to be processed are sandwiched between a pair of molds and pressed. Concavo-convex transfer method. 2. The surface of the soft material on which the convex portions are formed by the coloring agent and the processed surface of the material to be processed are overlapped, and the soft material and the material to be processed are passed between a pair of rolls and pressed. 3. The uneven transfer method described in . Sandwiching the workpiece having a cylindrical outer shape between a pair of molds,
The soft material having convex portions formed with the coloring agent on the surface of at least one of the molds facing the work material is held with the surface thereof facing the work material side,
2. The unevenness transfer method according to claim 1, wherein the workpiece is rotated and pressed by relatively moving the pair of molds.

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