JPH02217484A - Doorplate or nameplate made of copper or copper alloy - Google Patents

Abstract

PURPOSE:To produce a doorplate made of metal having attractive straight-grain pattern and capable of withstanding long use by applying etching treatment to a Cu or Cu-alloy sheet having unidirectionally solidified structure to allow the unidirectionally solidified structure to appear and then forming letters on the surface of the above by various methods. CONSTITUTION:A melt 1 of pure copper, such as oxygen-free copper, or Cu alloy, such as Cu-Zn, Cu-Sn, and Cu-Al, is drawn out through a horizontal mold 4 attached to a casting furnace 2 and having a heating device 3, and cooled by means of a cooler 6 to undergo solidification, and the resulting cast ingot 5 is drawn out by means of pinch rollers 7. At this time, the cast ingot 5 has unidirectionally solidified structure in its longitudinal direction 9 and this ingot 5 is cold-rolled and cut off in the form of a metal sheet, or, the melt 1 is poured into a cylindrical mold 10 lined with heat insulating material 12 and a heat generation agent 14 is sprinkled on the surface of the melt 1, and then the melt 1 is cooled via the bottom part through which cooling water is allowed to flow to undergo unidirectional solidification. Subsequently, the side face of the cold rolled sheet of the above ingots is cut and ground and then etched with an aqueous solution of nitric acid, etc., and then, letters are formed on the resulting surface at which a straight-grain pattern of the unidirectionally solidified structure is allowed to appear, e.g. by writing letters on the above surface or mechanically carving letters in the above surface, by which the doorplate having attractive straight- grain pattern can be produced.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to nameplates or nameplates made of copper or copper alloys.

[Conventional technology and its issues]

Conventionally, various materials such as wood, stone, ceramics, metal, and plastic have been used as the base material for nameplates or nameplates, but wood is the most commonly used material because of its beautiful grain, especially the straight-grain pattern. It is the material.

However, since wood has poor weather resistance, the grain of the wood quickly fades and loses its advantages, and it also has drawbacks such as lack of color and lack of weight.

[Means to solve the problem]

The present invention was made in view of this situation, and its purpose is to provide a nameplate or nameplate made of copper or prepared alloy that has a clear straight grain pattern that lasts for a long time.

That is, the present invention is characterized in that characters are written on the surface of a copper or copper alloy base material whose unidirectionally solidified structure is exposed by etching.

The present invention was made by focusing on the fact that the etching structure of the surface parallel to the solidification direction of an ingot made by melting copper or copper alloy and solidifying it in one direction is severely formed in a straight-grained pattern. In addition to unidirectionally solidified ingots, processed materials obtained by cold-working the above-mentioned ingots can also be applied; rather, ingots that are cold-rolled in the solidification direction, the crystal grains are elongated. As a result, a clearer straight-grained pattern can be obtained than ingots.

In the present invention, methods for unidirectionally solidifying copper or copper alloys include a hot mold continuous casting method in which heat extraction is performed only through the produced ingot, and an ingot rotation method used in the production of single crystals of Ge, etc. Any casting method can be used as long as it can solidify in one direction, such as a pull casting method or a casting method in which the sides of the mold are insulated and heat is extracted only from the bottom surface.

The copper or copper alloy used in the present invention includes pure copper such as tough pitch copper and oxygen-free copper, as well as Cu-Zn series and Cu-3n
system, Cu-Al! Copper alloys such as , etc. can be arbitrarily selected according to preferences such as color.

In the present invention, a method for etching a unidirectionally solidified ingot or a cold-worked material obtained by cold-working this ingot includes a method of immersing the ingot or cold-worked material in an aqueous solution such as nitric acid, hydrochloric acid, or sulfuric acid. etc. are used.

In the present invention, the methods for writing characters on the base material include writing on the etched surface of the base material with paint, etc., mechanically scraping off the characters, engraving, or masking the characters and etching only the base. Any method can be used, such as a method in which the letters are made to stand out by giving them a metallic luster, or a method in which only the letters are etched. It is also preferable to protect nameplates or nameplates with letters written on them by covering them with transparent resin or paint.

Incidentally, in the present invention, the nameplate is a commemorative plate or the like that records the history of the incident and the like. Further, the shape of the base material of the nameplate or nameplate of the present invention is not limited to a plate shape, but may be a round bar shape or the like.

[Effect]

One-way solidified ingots made by heat extraction and solidification of molten metal from only one end, or processed materials obtained by cold working this ingot, have a crystal structure in which a plurality of columnar crystals extend parallel to the longitudinal direction. When a surface parallel to the longitudinal direction of a lump or processed material is polished and etched, the degree of corrosion due to etching differs for each columnar crystal, and as a result, each columnar crystal has a difference in color or brightness, and the entire etched surface looks like wood. It looks like a straight grain pattern. In addition, the differences in color or brightness of each columnar crystal caused by etching are difficult to disappear,
The straight grain pattern remains clear for a long time.

〔Example〕

The present invention will be explained in detail below using examples.

Example 1 Pure copper was melted in a melting furnace, and the molten metal was melted into a mold with a cross-sectional dimension of 15 mm x 1 using the heating mold continuous casting device shown in Fig. 2.
It was cast into a plate-shaped ingot with a diameter of 0.00 m.

That is, the above-mentioned molten metal 1 is transferred to a heater-embedded casting furnace 2, and while maintained at 150°C, this molten metal 1 is passed through a mold 4 whose inner surface is heated to 1100°C with a heater 3. The ingot 5 produced from 4 is heated to 5j2/si by a cooler 6.
While cooling with running water of
Continuous casting was performed by drawing at a speed of w/win. In the above, since the melting point of steel is 1083'C, heat extraction during solidification is performed exclusively through the ingot 5, and as a result, the solid-liquid interface 8 is formed almost perpendicular to the drawing direction of the ingot 5, and the resulting cast Lump 5 had a unidirectionally solidified structure in which crystal grains extended in the longitudinal direction of the ingot.

The unidirectionally solidified ingot 5 thus obtained was cut to a length of 200 m, cleaned by degreasing and pickling, and then letters were written on the surface with lacquer paint, and the surfaces other than the above surfaces were cleaned. was covered with masking tape and then etched by immersing it in a 15% nitric acid aqueous solution for 2 minutes.Then, this base material was washed with water and the masking tape was removed.
The paint with the letters written on it was dipped in an organic solvent to dissolve it, then washed with water, dried, and then a transparent rear lacquer was applied to the entire surface of the base material to form a nameplate.

As shown in the replica in Figure 1, this nameplate has unetched metallic luster letters embossed in a straight-grained unidirectionally solidified structure 9, and the whole has a reddish color. It was a nameplate that was elegant, dignified, and full of elegance.

Example 2 FIG. 3 is an explanatory cross-sectional view of the one-way solidification mold used in this example. This mold 10 consists of a vertically arranged cylindrical mold 13 with a heat insulating material 12 pasted on its inner surface on a copper chill block 1 which is internally water-cooled. , heat extraction is performed only from the chill block 11, so that the cast structure becomes a unidirectionally solidified structure.

Then, 10 kg of Cu-15% Zn alloy was melted in a melting furnace, and poured into the mold 10 at a temperature of 1100°C to cast into an ingot measuring 30 W' x 100 W' x 450 m'. During casting, the heat insulating material 12 attached to the inner surface of the cylindrical mold 13 of the mold 10 was sufficiently heated, and the exothermic agent 14 was sprayed on the upper surface of the molten metal 1 in the mold 10, so that heat extraction was carried out from the chill block 11. The resulting ingot had a completely unidirectionally solidified structure.

After the ingot was prepared, it was cold-rolled in the same direction as the solidification direction to form a rolled plate with a thickness of 18 mm, and then the side surfaces of this rolled plate were cut and removed to form a 18 mm 1 x 90 inch plate. X2
After polishing the surface of this plate, it was immersed in an aqueous solution of nitric acid with a concentration of 15% to reveal the structure and used as a base material. Due to the cold rolling, the structure of this base material had a unidirectionally solidified structure that was elongated and had a straight grain pattern that was more regular than that of &Im as cast.

Clear lacquer was applied to the surface of this straight-grained base material, and after drying, letters were written with paint to form a nameplate.

This nameplate was beautiful and dignified, with letters written clearly on a pale orange board with a clear straight-grain pattern.

Each of the nameplates obtained in this way was hung on a gatepost and used for a long period of time, but the straight-grained pattern remained clear and no discoloration was observed in both cases.

Although the nameplate has been described above, the same manufacturing method can be used for nameplates, and the same effects can be obtained.

〔effect〕

As described above, the nameplate or nameplate of the present invention has a straight-grained pattern and is beautiful, and various colors and writing methods can be selected.Furthermore, the nameplate or nameplate of the present invention has a straight-grained pattern and color tone. It remains clear for a long time and is extremely useful in practice.

[Brief explanation of the drawing]

FIG. 1 is a schematic drawing showing one embodiment of the nameplate of the present invention, and FIG.
□ Figure 3 is an explanatory view showing an example of a unidirectional solidification casting method of a substrate used for a nameplate or nameplate of the present invention. 1... Molten metal, 4... Mold, 5... Ingot, 9
...-Directional solidification tissue.

Claims (1)

[Claims] A nameplate or nameplate characterized in that characters are written on the surface of a copper or copper alloy base material in which a unidirectionally solidified structure is revealed by etching.