JP2001212760A - Design face forming method for metallic material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a design face forming method for a metallic material capable of imparting multiple design textures and easily forming a design face even on a thin metallic material. SOLUTION: On the surface of a thin metallic plate 11 with a thickness of 0.5 mm, a design face 11a is formed when a grained face 12 is arranged by means of wet blasting, and the design face 11a is overlaid with a chemical conversion coating 13 and a clear paint film 14. By wet blasting, the surface of the metallic plate 11 is machined sufficiently at a low pressure (20 Mpa), so that the design face 11a can be formed without bending the thin metallic plate 11 with a thickness of 0.5 mm, while reflectance of light on the grained face 12 is changed when the dimension and the like of a projection material 15 blasted on to the surface of the metallic plate 11 is varied, and consequently, multiple kinds of design texture can be provided onto the design face 11a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a design surface of a metal material.

[0002]

2. Description of the Related Art In general, when a metal material is used for some purpose, various design surfaces are formed to improve the appearance of the design surface (surface). Conventionally, in forming such a design surface, there is a case where the metal is formed so as to make use of a high-grade feel and a texture due to the glitteriness of the metal itself. The following method is known as one of the design surface forming methods utilizing the glitter of the metal itself.

First, the surface of a metal material is polished by a known buffing machine. Then, depending on the type and size of the abrasive, the surface of the metal material is formed on a design surface having a plurality of linear streaks, a so-called hairline, in the same direction, or on a full-gloss design surface having a metallic luster as a whole. Or be formed. Then, a known chemical conversion coating treatment is applied to the design surface formed by the polishing, and a clear coating film having a light transmitting property is applied thereon. As a result, the surface of the metal material becomes a design surface having a high-grade feel and texture due to the glitteriness of the metal itself.

[0004]

However, conventionally, as a design surface of a metal material obtained only by polishing with a buffing machine, only two kinds of changes, the hairline and the total gloss, which are caused by the difference in the abrasive, can be obtained. However, there is a problem that the user has a monotonous texture.

On the other hand, a method of processing a metal surface by drive-last processing is conceivable. However, since the blast material is blown together with compressed air, there is a problem that blast material and cutting dust on the metal surface scatter. In addition, a pressure of 40 MPa or more is required to properly perform drive blast processing. And under that pressure 0.5
When a thin metal surface of less than mm is processed, the metal material is deformed, and the metal material must be hot-pressed in order to undo the deformation, and there is a problem that the operation is very troublesome.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide various kinds of design textures and easily design a thin metal material. It is an object of the present invention to provide a method for forming a design surface of a metal material capable of forming a surface.

[0007]

Means for Solving the Problems In order to solve the above problems, the gist of the present invention is to form a design surface by wet blasting on the surface of a metal material.

According to a second aspect of the present invention, in the first aspect, the thickness of the metal material is 0.5 mm or less. According to a third aspect of the present invention, in the first or second aspect, the wet blasting is performed using a polishing liquid obtained by mixing a shot material with a water-soluble cutting liquid.

According to a fourth aspect of the present invention, in any one of the first to third aspects, a clear coating film is formed on a design surface after the wet blasting.

According to a fifth aspect of the present invention, in the fourth aspect, prior to the step of forming the clear coating film, a chemical conversion treatment is performed on the design surface to form a transparent chemical conversion film. And

According to the first aspect of the present invention, since the surface of the metal material is processed by wet blasting which can process the metal surface even when the spray pressure is low, even a thin metal plate is not bent. A design surface to which various kinds of textures are given is formed, and dust does not fly.

According to the second aspect of the present invention, even with a thin metal material of 0.5 mm or less, the metal material can be processed without bending by wet blasting which can be processed at a low pressure. According to the third aspect of the present invention, the design surface is formed by spraying the blast material onto the surface of the metal material with the water pressure of the water-soluble cutting fluid.

According to the fourth aspect of the present invention, since the clear coating film is formed on the design surface formed by wet blast, the design surface of the metal material is damaged by the clear coating film due to corrosion and contact. And the texture obtained by wet blasting is maintained as it is.

According to the fifth aspect of the invention, by forming the chemical conversion film before forming the clear coating film, the corrosion resistance of the metal material and the adhesion of the clear coating film are improved, and the chemical conversion film is transparent. Therefore, the texture obtained by wet blasting is maintained as it is.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an enlarged cross-sectional view showing a metal plate having a design surface according to the present embodiment. A thin metal plate 1 made of magnesium as a metal material (in this embodiment, 0.5 mm).
An uneven surface 12 formed by wet blasting is provided on the entire surface of the surface 1. The design surface of the metal plate 11 is constituted by the textured surface 12. A colorless and transparent chemical conversion film 13 formed by a chemical conversion treatment of manganese phosphate over the entire surface of the grained surface 12 is provided. A colorless and transparent clear coating film 14 containing no pigment is overcoated on the upper surface of the chemical conversion film 13.

Here, the wet blast processing will be described in detail. As shown in FIG. 3, the wet blasting process is performed by using a water-soluble cutting fluid 16, silica sand, cast iron grit,
This is a processing method in which a polishing liquid 17 mixed with a blasting material 15 such as a cut wire or alumina grit is sprayed at a predetermined water pressure (in this embodiment, 20 MPa) at a high speed onto a processing surface.

Next, the metal plate 11 constructed as described above is used.
A method for forming a design surface will be described. First, as shown in FIG. 2, a metal plate 11 formed into a predetermined shape by casting or the like.
Has material defects 18 such as depressions, oil wrinkles, and cavitation. Then, the surface of the metal plate 11 having the material defects 18 is polished by wet blasting. That is, as shown in FIG. 3, a polishing liquid 17 containing a water-soluble cutting liquid 16 and a blast material 15 is sprayed onto the surface of the metal plate 11 at a high pressure at a water pressure of 20 MPa. Then, the portion having the material defect 18 formed on the surface is shaved off by the blasting material 15, and the surface of the metal plate 11 is textured over the entire surface thereof.
It becomes 2.

At this time, the blasting material 15 sprayed on the surface of the metal plate 11 and the metal dust removed by the blasting material 15 do not scatter, but together with the water-soluble cutting fluid 16 sprayed on the surface of the metal plate 11. Washed. Also,
The water pressure of 20 MPa is a pressure sufficient to form the embossed surface 12 on the metal plate 11 unlike the case of blowing compressed air. Note that the projection material 15 is sprayed by 0.5
Unlike the pressure (40 MPa or more) blown in the drive blasting process, the metal plate 11 having a low water pressure of 20 MPa has actually been confirmed to be able to withstand pressure without bending due to the pressure.

Metal plate 11 wet with water-soluble cutting fluid 16
After the grain surface 12 is dried, the grain surface 12 is subjected to a chemical conversion coating treatment as shown in FIG. That is, a chemical conversion treatment agent composed of manganese phosphate is sprayed,
Alternatively, the metal plate 11 is immersed in the manganese phosphate solvent to form the colorless and transparent chemical conversion film 13. Thereafter, a clear coating film 14 is formed by applying a colorless and transparent clear paint on the upper surface of the chemical conversion film 13.

When the size, material (including hardness), and shape of the projection material 15 are changed, the surface roughness of the grained surface 12 of the metal plate 11 formed as described above is changed accordingly. The surface becomes rough and the surface becomes fine. Then, when the size, material (including hardness), and shape of the projection material 15 are different from each other, the ratio of the luminous flux reflected per unit area due to the irregular reflection of the light incident on the formed grain surface 12, ie, Light reflectivity is different. Along with this, on a surface with a rough grain, it appears as low gloss because the light flux of the reflected light that passes through the unit area due to irregular reflection is small (the reflectance is low). Then, on the surface with fine grain, since the light flux of the reflected light that passes through the unit area due to irregular reflection is large (the reflectivity is high), that is, the surface approaches the mirror surface and appears to have high gloss. As a result, various design surfaces having different textures are formed due to the difference in roughness of the textured surface 12.

Therefore, according to the above embodiment, the following effects can be obtained. (1) In the above embodiment, the metal plate 11 is polished, that is, the design surface is formed by forming the textured surface 12 by wet blasting. Conventionally, wet blasting has been used to remove a coating film formed on a processed surface of a material, or to clean, wear, or harden the surface. No blasting is performed. And
This wet blasting process is different from the drive blasting process in that the grained surface 12 can be sufficiently formed on the surface of the metal plate at a low pressure (20 MPa), so that it is thin (0.5 m).
m) The surface of the metal plate 11 can be treated without bending.

(2) In the above-described embodiment, the projection material 15 is blasted from the front to the surface of the metal plate 11 in polishing the metal plate 11, that is, the design surface formation is different from the conventional design surface formation by buff polishing. Since this is performed by forming the textured surface 12, the roughness of the textured surface 12 varies depending on the size, material (including hardness), and shape of the projection material 15. Therefore, the ratio of the luminous flux reflected per unit area due to the irregular reflection of the light incident on each textured surface 12, ie,
Light reflectivity is different, and the rougher the grain, the lower the glossy design surface, and the finer the grain, the higher the glossy design surface. As a result, various types of design textures can be imparted to the surface of the metal plate 11.

(3) In the above embodiment, the projecting material 15 sprayed on the surface of the metal plate 11 and the metal dust removed by the projecting material 15 flow together with the water-soluble cutting fluid 16 constituting the polishing liquid 17. Therefore, the projection material 15 and the metal dust do not scatter.

(4) In the above embodiment, since the clear coating film 14 is formed on the grained surface 12 of the metal plate 11, the grained surface 12 of the metal plate 11 is protected from damage due to corrosion and contact. It is protected and the durability of the textured surface 12 can be improved.

(5) In the above embodiment, the chemical conversion film 13 is formed between the embossed surface 12 and the clear coating film 14 by a manganese phosphate salt. The adhesion of the coating film 14 can be improved.

(6) In the above embodiment, since the chemical conversion film 13 and the clear coating film 14 are colorless and transparent, the texture obtained by wet blasting can be maintained as it is. In addition,
The above embodiment may be changed to another example as described below.

In the above embodiment, the grained surface 12 is formed on the thin metal plate 11 of 0.5 mm by wet blasting, but for example, 0.5 mm such as 0.4 mm or 0.3 mm.
It is also possible to form a design surface by subjecting a thinner metal plate to wet blasting. 0.4mm
Even when the thickness was 0.3 mm or 0.3 mm, the metal plate was not bent in an uneven shape. In addition, a thick metal plate 11 exceeding 0.5 mm
Of course, it is also possible to form a design surface.

In the above embodiment, the wet blast treatment is performed at a water pressure of 20 MPa. However, the design surface is not limited to the above pressure, and the design surface can be formed at a lower pressure of 10 MPa than 20 MPa. Also, of course, 30MPa
It is also possible to form a design surface at the above high pressure.

In the above-described embodiment, the colorless and transparent clear coating film 14 is formed on the grained surface 12 of the metal plate 11. However, the color clear coating film containing a pigment that does not make the grained surface 12 invisible is applied to the grained surface. 12 may be applied. Further, the design surface may be formed only by the textured surface 12 by wet blasting without forming the clear coating film 14. Even in this case, various types of texture can be imparted to the surface of the metal plate 11 due to the difference in the reflectance of light with respect to the textured surface 12.

In the above embodiment, the chemical conversion film 13 was formed before forming the clear coating film 14 on the grained surface 12. However, the clear coating film 1 was directly formed on the grained surface 12 without performing the chemical conversion film treatment.
4 may be formed.

In the above embodiment, a manganese phosphate salt is used as a chemical conversion treatment agent in the chemical conversion film 13. However, the chemical conversion treatment agent is not limited to the manganese phosphate salt. Other phosphates, such as iron salts, or other chemical treatments, such as chromates, may be used.

In the above embodiment, the embossed surface 12 is formed on the metal plate 11, but if the metal material has a design surface,
For example, the textured surface 12 may be formed by a wet blast process on a metal material of any shape such as a cylindrical metal material or a metal material of a box.

In the above embodiment, the metal plate 11 is made of magnesium. However, the metal plate 11 may be made of another metal material such as aluminum, copper, and stainless steel. In the above embodiment, the liquid constituting the polishing liquid 17 is a water-soluble cutting liquid. However, the liquid is not limited to the water-soluble liquid, and another liquid may be used.

[0034]

As described above in detail, according to the first aspect of the present invention, while various types of design textures can be provided, a design surface can be easily formed even on a thin metal material.

According to the second aspect of the invention, in addition to the effect of the first aspect, the surface of the metal material is processed by wet blast which can process the metal surface even when the spray pressure is low. Even for thin metal materials of .5mm or less,
The metal material can be processed without bending.

According to the third aspect of the invention, in addition to the effects of the first or second aspect, the design surface is formed by spraying the blast material onto the surface of the metal material with the water pressure of the water-soluble cutting fluid. can do.

According to the fourth aspect of the present invention, in addition to the effects of any one of the first to third aspects, a clear coating film is formed on a design surface formed by wet blasting. Therefore, the design surface of the metal material can be protected from damage due to corrosion and contact by the clear coating film, and the texture obtained by wet blasting can be maintained as it is.

According to the fifth aspect of the present invention, in addition to the effect of the fourth aspect of the present invention, a chemical conversion film is formed on a design surface before forming a clear coating film, so that the corrosion resistance and the clearness of the metal material are improved. While improving the adhesion of the coating film,
Since the chemical conversion coating is transparent, the texture obtained by wet blasting can be maintained as it is.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view illustrating a metal plate having a design surface according to an embodiment.

FIG. 2 is an enlarged sectional view showing a metal plate before a design surface is formed.

FIG. 3 is an enlarged cross-sectional view showing a metal plate on which wet blasting has been performed.

FIG. 4 is an enlarged cross-sectional view showing a metal plate similarly subjected to a chemical conversion film treatment.

[Explanation of symbols]

11: metal plate (metal material), 12: embossed surface (design surface),
13 ... conversion coating, 14 ... clear coating, 15 ... shot material, 1
6: water-soluble cutting fluid, 17: polishing fluid.

Claims (5)

[Claims] 1. A method for forming a design surface of a metal material, comprising forming a design surface on the surface of the metal material by wet blasting. 2. The method for forming a design surface of a metal material according to claim 1, wherein the thickness of the metal material is 0.5 mm or less. 3. The method for forming a design surface of a metal material according to claim 1, wherein the wet blasting is performed with a polishing liquid obtained by mixing a shot material with a water-soluble cutting liquid. 4. The method for forming a design surface of a metal material according to claim 1, wherein a clear coating film is formed on the design surface after the wet blasting. 5. Prior to the step of forming a clear coating film,
The method for forming a design surface of a metal material according to claim 4, wherein a chemical conversion film treatment is performed on the design surface to form a transparent chemical conversion film.