Method of producing watermark-patterned metal sheet

Abstract

To provide a method of producing a novel, deep watermark-patterned metal sheet.SOLUTION: A method of producing a watermark-patterned metal sheet includes: burying a sheet 3 having a portion having a thickness of 3 mm or smaller between upper and lower dies 1, 2 consisting of a sand mold; removing away the sheet 3 with the upper and lower dies 1, 2 separated; and placing together the upper and lower dies 1, 2 in place to pour molten metal 19 into a gap formed by removing the sheet 3.SELECTED DRAWING: Figure 1-1

Description

[Technical field]

[0001] The present invention relates to a method for producing a metal sheet with an openwork pattern. [Background technology]

[0002] Metal plates with openwork patterns have existed for some time, but the openwork patterns on these metal plates tend to be traditional, with motifs of flowers and plants, and are thick, static, and lacking in originality. Summary of the Invention [Problem to be solved by the invention]

[0003] In view of the above-mentioned circumstances, the present invention has an object to provide a method for manufacturing a metal plate with a thin, lightweight, delicate, dynamic, original and deep openwork pattern. [Means for solving the problem]

[0004] In order to achieve the above object, the manufacturing method for a metal plate with an openwork pattern according to the invention described in claim 1 is characterized in that a plate having a portion having a thickness of 3 mm or less is embedded between an upper and lower mold consisting of a sand mold, the upper and lower molds are separated to remove the plate, and the upper and lower molds are brought together to remove the plate and then molten metal is poured into the gap created by the removal.

[0005] The method for manufacturing a metal plate with an openwork pattern according to the invention described in claim 2 is characterized in that, in addition to the configuration of the invention described in claim 1, the plate is made by combining clay plates of different thicknesses in a mosaic pattern.

[0006] The method for manufacturing a metal plate with an openwork pattern according to the invention described in claim 3 has the same features as the invention described in claim 1 or 2, and is characterized in that the plate is made of clay and is partially scraped or built up. Effect of the Invention

[0007] The manufacturing method for metal plate with openwork pattern according to the invention described in claim 1 involves embedding a plate having a portion with a thickness of 3 mm or less between upper and lower dies consisting of sand molds, separating the upper and lower dies to remove the plate, and then bringing the upper and lower dies together and pouring molten metal into the gap created by removing the plate, thereby forming an irregular, lace-like openwork pattern that is sometimes unpredictable, making it possible to produce a lightweight metal plate with openwork pattern that is innovative and profound, full of delicacy and dynamism.

[0008] In the manufacturing method of a metal plate with an openwork pattern according to the invention described in claim 2, the plate is made by combining clay plates of different thicknesses in a mosaic pattern, which makes it possible to arrange a lace-like openwork pattern with different proportions of the area of ​​the translucent parts in a single metal plate, thereby making it possible to produce a metal plate with an openwork pattern that is even more innovative and profound.

[0009] In the manufacturing method of the openwork metal plate according to the invention described in claim 3, the plate is made of clay, and by partially scraping or building up the clay, opaque and transparent parts can be intentionally formed, enhancing the artistic quality. [Brief description of the drawings]

[0010] [Figure 1-1] 1 is an explanatory diagram showing a manufacturing process of the openwork metal plate of the present invention. FIG. [Figure 1-2] 1A to 1C are explanatory diagrams showing the manufacturing process of the watermarked metal plate of the present invention (continuation of FIG. 1-1). [Diagram 2] Photographs showing the state of the watermark pattern for different gap sizes. [Diagram 3] 1 is a photograph showing an example of the use state of the watermarked metal plate of the present invention. [Figure 4] FIG. 2 is a plan view showing an example of a plate used in manufacturing the metal plate. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Figures 1-1 and 1-2 show a manufacturing process of a metal plate having a watermark according to the present invention. First, as shown in Fig. 1-1(a), a number of plates 4a, 4b, 4c, 4d, ... with different thicknesses are made from clay. The thicknesses of the plates 4a, 4b, 4c, 4d, ... are, for example, 4 mm, 3.5 mm, 3 mm, 2.5 mm, 2 mm, 1 mm, and 0.5 mm. Next, as shown in Fig. 1-1(b), clay plates 4a, 4b, 4c, 4d, ... of different thicknesses are combined in a mosaic pattern to make one plate 3, which is then placed on top of the lower mold 2 filled with sand 6 in a frame 5. At this time, grooves 7 may be formed in the plate 3, or strings of clay 8 may be added to build up the surface. Next, as shown in FIG. 1-1(c), the frame 5 of the upper mold 1 is placed on the frame 5 of the lower mold 2, and sand 6 is packed into the frame 5. Next, as shown in FIG. 1-2(d), the upper mold 1 and the lower mold 2 are separated, and the embedded plate 3 is removed. Next, as shown in FIG. 1-2(e), upper mold 1 and lower mold 2 are joined together, plate 3 is removed, and molten metal 19, specifically copper or copper alloy at 1000 to 1200° C., is poured into the gap. After that, the upper die 1 and the lower die 2 are separated and the metal plate is taken out.

[0012] In the metal plate manufactured by the above process, the molten metal flows into gaps of 3 mm or less, forming an irregular lace-like openwork pattern 12 in which the proportion of the area of ​​the translucent parts (transparent parts) varies depending on the size of the gap, as shown in Figures 2(a) to (d). As is clear from these photographs, the larger the gap, the easier it is for the molten metal 19 to flow into the gap, so the proportion of the area of ​​the translucent parts becomes smaller (see Figure 2(a)), and the smaller the gap, the more difficult it is for the molten metal 19 to flow into the gap, so the proportion of the area of ​​the translucent parts becomes larger (see Figure 2(d)). As a result of experiments conducted by the applicant, it was found that when the gap size is 0.5 to 1 mm, a lacy openwork pattern 12 with a translucent area ratio of 65 to 45% is obtained, when the gap size is 1.0 to 2.5 mm, a lacy openwork pattern 12 with a translucent area ratio of 40 to 20% is obtained, and when the gap size is 2.5 to 3.5 mm, a lacy openwork pattern 12 with a translucent area ratio of 20 to 10% is obtained. In addition, by partially removing the clay slab 3 to be embedded in the mold, the molten metal 19 will not flow into that portion, and conversely, by piling up the clay slab 3, the molten metal 19 will flow into that portion, so that transparent and opaque portions can be intentionally formed, enhancing the artistic quality.

[0013] 3 shows an example of how the openwork metal plate 9 of the present invention is used, in which the metal plate 9 is attached in front of a mirror 10. This openwork metal plate 9 has a rectangular outer shape with a large, roughly circular hole 11 formed in the center, around which an irregular lace-like openwork pattern 12 is formed.

[0014] Fig. 4 shows an example of the plate 3 used in manufacturing the openwork metal plate 9. As shown in the figure, the plate 3 is composed of five types of clay plates 4a, 4b, 4c, 4d, and 4e with thicknesses of 4 mm, 3 mm, 2.5 mm, 2 mm, and 1 mm. The 4 mm thick clay plate 4a is used for the surrounding rectangular frame-like portion 13, the 3 mm thick clay plate 4b is used for the portion between the frame-like portion 13 and the outer circle 14, the 2.5 mm thick clay plate 4c is used for the portion between the outer circle 14 and the inner rectangle 15, the 2 mm thick clay plate 4d is used for the portion between the inner rectangle 15 and the inner circle 16, and the 1 mm thick clay plate 4e is used inside the inner circle 16. A runner 17 is formed on both the left and right sides of this plate 3, and a plurality of gates 18 are provided spanning from the runner 17 to the surrounding rectangular frame-like portion 13. Molten metal 19 is poured into the mold, consisting of upper and lower halves 1 and 2, in a vertical position, from a gate 20 provided at the upper end of the runner 17.

[0015] The surrounding frame-like portion 13 is made of a 4 mm thick clay plate 4a, so the molten metal 19 flows into this portion as a whole. Between the surrounding frame-like portion 13 and the central circle 16, clay plates 4b, 4c, and 4d of different thicknesses are combined and used, forming an irregular and complex lace-like openwork pattern 12 between the surrounding frame-like portion 13 and the central circle 16 (see Figure 3).

[0016] As described above, the method for manufacturing a metal plate with an openwork pattern according to the present invention involves embedding a plate 3 having a portion with a thickness of 3 mm or less between an upper mold 1 and a lower mold 2 made of sand, separating the upper mold 1 and the lower mold 2 to remove the plate 3, and then bringing the upper mold 1 and the lower mold 2 together and pouring molten metal 19 into the gap created by removing the plate 3, thereby forming an irregular lace-like openwork pattern 12 that is sometimes unpredictable, and making it possible to manufacture a lightweight metal plate with an openwork pattern that is innovative and profound, full of delicacy and dynamism. In the method of manufacturing a metal plate with an openwork pattern according to the present invention, the plate 3 is made by combining clay plates 4a, 4b, 4c, 4d, ... of different thicknesses in a mosaic pattern, so that a lace-like openwork pattern 12 with different proportions of the area of ​​the translucent parts can be arranged in a single metal plate 9, thereby making it possible to manufacture a metal plate 9 with an openwork pattern that is even more innovative and profound. In addition, in the method of manufacturing a metal plate with an openwork pattern according to the present invention, the plate 3 is formed from clay, and by partially scraping or building up the clay, opaque and transparent parts can be intentionally formed, thereby enhancing the artistic quality.

[0017] The present invention is not limited to the above-described embodiment. The plate embedded between the upper and lower dies only needs to have at least a portion with a thickness of 3 mm or less, and the material and shape of the plate are not important. The method (plan) of pouring molten metal into the gap formed between the upper and lower dies is arbitrary. The metal is not limited to copper or copper alloy, but may be iron, aluminum, etc. The use of the openwork metal plate according to the present invention is not particularly limited, and it may be used, for example, for decoration of mirrors, picture frames, doors, partitions, etc., or used alone for ornamental purposes. [Explanation of symbols]

[0018] 1 Upper mold 2 Lower mold 3 boards 4a, 4b, 4c, 4d, 4e Clay slabs

Claims

1. The method for manufacturing the metal plate with the openwork pattern is characterized in that a plate having a portion with a thickness of 3 mm or less is embedded between upper and lower dies made of sand molds, the upper and lower dies are separated to remove the plate, and the upper and lower dies are brought together to remove the plate, and molten metal is poured into the gap formed.

2. 2. The method for manufacturing a metal plate with a watermark pattern according to claim 1, wherein the plate is made by combining clay plates of different thicknesses in a mosaic pattern.

3. 3. The method for producing a metal plate with an openwork pattern according to claim 1 or 2, characterized in that the plate is made of clay and is partially scraped or built up.

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