JPS6058792B2 - Engraving method using corrosive liquid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chemical engraving method that allows precise and deep engraving.

As is well known, in the chemical engraving method, a metal object to be processed is masked by various methods such as a photomask method and a taping method, and the exposed portions that are not masked are etched with a corrosive solution.

In the above-mentioned engraving method, since the corrosive liquid makes only one contact with the surface to be processed, the pattern formed by the corrosion of the metal body is shallow.

When the corrosive solution is repeatedly applied to form deep irregularities,
As shown in FIG. 6, the etching progresses not only in the depth direction of the metal body 3 but also in the lateral direction, and the width of the corrosion hole 31 becomes larger than the opening width of the mask 8.

In addition, it is not possible to control the etching depth so that part of the surface to be processed is corroded shallowly and another part is corroded deeply.
As shown in the figure, it is not possible to form a stepped groove 21, in particular a groove with slopes 20. To prevent side etch,
The giraffe blood method or the gate powderless method can be used.

However, in the giraffe method, giraffe resin powder is fused to the side wall of the corroded hole for each etching, and this operation must be repeated until the corroded hole reaches a desired depth, which is extremely time-consuming and impractical. In addition, the powderless method uses a corrosive solution containing special additives, and there are various limitations such as the method of applying the corrosive solution and the fact that the surface to be machined of the metal object must face downward.
The scope of application is narrow.

Further, in any of the above methods, masking the metal body and removing the mask are indispensable and time-consuming. Therefore, a method has been proposed (Japanese Patent Publication No. 18251/1989) in which a corrosive liquid is applied to a cylindrical metal body through a rotating matrix having a pattern of concavo-convex patterns on the surface, and this process is repeated to engrave the metal body.

However, in the above case, the master mold was simply applied to the metal body with an etchant, and the time required for engraving was long.

In the present invention, the surface of the metal body is oxidized in advance with a corrosive solution, and a matrix with an uneven pattern on the surface is pressed against the oxidized surface of the metal body to destroy the oxide film on the matrix, and this process is repeated. The purpose is to provide an engraving method that enables engraving in a relatively short time.

The present invention will be specifically described below based on embodiments shown in the drawings.

FIG. 1 shows a matrix 1 used in the present invention. The matrix is formed into a cylindrical shape from a material that is not affected by etching solution, such as vinyl chloride or epoxy resin, and has an uneven pattern 2 on its outer circumferential surface. It represents.

The uneven pattern 2 of the example has a plurality of protrusions 2a with slightly different widths, heights, and side slopes 2b! However, it is of course possible to express various patterns of unevenness without being limited to this. FIG. 2 shows a metal body 3 to be machined, and the diameter of the metal body 3 is approximately equal to the maximum size of the mother die 1! Equally, the total length is equal to the total length of the matrix 1.

The surface of the metal body 3 is subjected to activation treatment such as degreasing.

Figure 3 shows the processing method; a tank 4 containing an etchant with a higher acid concentration than the etchant used for normal etching.
The metal body 3 is freely rotatably placed on the top so that the lower part thereof is immersed in the corrosive liquid.

The support shaft 12 is fitted into the through-hole 11 of the mother mold, and a biasing means (not shown) such as a spring is connected to the shaft 12.
Therefore, the mother mold 1 is urged toward the metal body 3, and the metal body 3 and the mother mold 1 are brought into constant contact.

In the above state, either or both of the mother mold 1 and the metal body 3 are connected to a rotary drive device (not shown) and rotated at low speed in opposite directions. The metal body 3 is eroded by the corrosive liquid and forms an oxide film on its surface.

The metal body 3 and the matrix 1 rotate synchronously in opposite directions, and are pressed against the oxide film on the surface of the metal body or the convex portion of the maximum height of the uneven pattern of the matrix 1, causing cracks and destruction. . The corrosive liquid penetrates deep into the oxide film through the crack where the destroyed part of the oxide film is once again immersed in the corrosive liquid.

As a result, corrosion progresses further in the destroyed portion of the oxide film, and the oxidized portion is also successively pressed against the convex portion of the matrix 1 and destroyed. The amount that the oxide film is destroyed and the surface of the metal body is scraped is very small, but as the matrix 1 and the metal body 3 continue to rotate, the surface of the metal body 3 is corroded by the corrosive liquid. , the formation of an oxide film and the destruction of the oxide film are repeated, and in the end, a concavo-convex pattern whose concavities and convexities are opposite to the concavo-convex pattern 2 of the matrix 1 can be formed.

Experiments have shown that it is possible to engrave at a depth of 40 microns per hour.

FIG. 4 shows a method of engraving a plate-shaped metal body 3 using a plate-shaped master mold 1.

The metal body 3 is fixed to a table 6, and a corrosive liquid is applied to the metal body 3 by an elastic application roller 5 rolling on the metal body 3.

A supply roller 7 whose lower part is immersed in the corrosive liquid tank 4 is provided at one end of the table 6. When the application roller 5 reaches the moving end, it comes into contact with the supply roller 7, and the rotation of the supply roller 7 causes the corrosive liquid to flow out. It is supplied to the application roller 5.

An elevating frame 61 is provided above the transfer path of the application roller 5, and the master die 1 is attached to the frame 61.

Every time the applicator roller 5 makes one reciprocation, the elevating frame 61 and the mother die 1
The metal body 3 descends and comes into contact with the metal body 3, and as described above, the oxide film of the metal body 3 is repeatedly destroyed by the matrix 1, thereby forming a deep uneven pattern on the metal body 3. When engraving a plate-shaped metal body 3 as described above, the matrix 1 is not a plate-shaped one, but a cylindrical matrix 1 is used as shown in FIG. It may be rolled repeatedly on the body 3.

Further, as shown in FIG. 3, a plate-shaped matrix is pressed against a cylindrical metal body 3 whose lower part is immersed in a corrosive liquid from above, and the matrix is moved back and forth. However, the metal body 3 can be engraved.

As described above, in the present invention, a cylindrical matrix can be used to engrave a cylindrical or plate-shaped metal body, and a plate-shaped matrix can be used to engrave a plate-shaped or cylindrical metal body. Of course, as shown in FIG. 5, it is also possible to engrave a metal body 3 whose entire surface to be processed is largely concave. In this case, the processed surface 33 of the metal body 3 is recessed into a bowl shape at the same time as the metal body 3 is cast, or by pre-processing such as cutting.

The mother die 1 is bulged in correspondence with the depression in the processed surface 33 of the metal body 3, and an uneven pattern 2 having a draft slope is formed on the surface of the bulge 1a.

The corrosive liquid is intermittently applied to the metal body 3 by the spray device 40, and the matrix 1 and the metal body 3 are repeatedly brought into contact with each other in the same manner as described above to engrave the surface 33 of the metal body 3 to be machined.

The method of applying the corrosive liquid to the metal body 3 using the above-mentioned spray device can also be carried out to apply the corrosive liquid to the cylindrical metal body 3 shown in FIG. 3 or the plate-shaped metal body 3 shown in FIG. Of course.

In the present invention, a corrosive liquid is applied to the metal body 3 to form an oxide film, and this is destroyed by the convex parts of the matrix 1, and this destruction, that is, the application of the corrosive liquid to the surface of the metal body 3 and the pressing by the convex parts, is prevented. A deep uneven pattern opposite to the unevenness of the matrix 1 can be repeatedly formed on the metal body 3 easily and in a relatively short time.

In addition, there is no need to apply or remove masking as in the conventional method, and since no masking is used, there is no risk of side etching, and it has the excellent effect of forming a precise uneven pattern that is faithful to the mother mold. has.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of the matrix, Fig. 2 is an oblique view of the metal body, Fig. 3 is an explanatory view of the engraving device, Figs. 4 and 5 are explanatory views of other embodiments, Figure 6 is a cross-sectional view of side etching.
FIG. 7 is a cross-sectional view of a stepped groove formed in a metal body.

Claims (1)

[Scope of Claims] 1. Corrosion is prevented by contacting a metal body whose surface is coated with a corrosive liquid with a matrix made of a corrosion-resistant material and having an uneven pattern on the surface while pressing the metal body. The surface of the metal body that has been eroded and oxidized by the liquid is pressed with the convex part of the matrix to destroy the oxide film, and the corrosive liquid is applied to the metal body again to penetrate into the inside of the destroyed oxide film. Therefore, the corrosion of the destroyed portion of the oxide film is allowed to proceed, and the corroded portion is broken again by the convex portion of the matrix, and by repeatedly applying the corrosive liquid to the metal body and contacting the matrix, An engraving method using a corrosive liquid that is characterized by gradually indenting the surface of a metal object to form an uneven pattern that is the opposite of the uneven pattern of the matrix. 2. The engraving method using an etchant according to claim 1, wherein the matrix and the metal body are cylindrical, and the engraving is performed while rotating in opposite directions while in contact with each other. 3. The engraving method using a corrosive liquid according to claim 1, wherein the matrix and the metal body are plate-shaped, and the matrix and the metal body are repeatedly brought into contact and separated from each other for engraving. 4. An engraving method using an etchant according to claim 1, in which a cylindrical matrix is repeatedly rolled on a plate-shaped metal body for engraving. 5. The engraving method using an etchant according to claim 2, wherein the etchant is applied to the metal body while the metal body is immersed in a tank containing the etchant. 6. An engraving method using a corrosive liquid according to claim 3 or 4, in which the corrosive liquid is sprayed onto a metal body using a spray device.