JPS61115606A - Rolling plate made of copper and copper alloy - Google Patents

Abstract

PURPOSE:To obtain a rolling plate made of copper and copper alloy on which finger prints and hand prints are hardly stickable by roughening the surface of the rolling plate made of copper (alloy) with a rolling roll having the roughened surface to some extent and forming the crest of the surface of the rolling plate to a sharp-edged shape. CONSTITUTION:The copper (alloy) is rolled by, for example, a steel roll of which the surface is roughened by a means such as shot blasting and the surface thereof is roughened in the following manner: The surface of the rolling plate is so rolled that the max. height within at least 1 inch length in the direction parallel and perpendicular thereto is >=2mum and that the number of the crests having >=15mum inch height within 1 inch length is >=15 pieces and further the surface is so roughened that the above-mentioned crests have the sharp edged shape. The rolling plate made of the copper and copper alloy which are im proved in the resistance to finger prints and eliminates the need for finger print removing in the production process is thus obtd.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to rolled plates made of copper and prepared alloys.

[Prior art] Rolled plates made of copper and prepared alloys include those with a mirror-like surface, that is, bright finished surfaces (B, C,), and those with a dull finish that is slightly rougher than the bright finished surface but sufficiently flat. It is known that these rolled plates have surfaces (D, C, etc.), and these rolled plates are used for a variety of purposes, including parts for chassis and covers of electrical equipment such as televisions, stereos, and videos, and audio equipment. .

By the way, since this type of rolled plate is handled by many workers' bare hands in the manufacturing process of these products, there is a problem in that fingerprints and handprints are left on the surface of the rolled plate, deteriorating the appearance of the product.

Therefore, conventionally, fingerprints are removed using chemicals or the like at the final stage of the manufacturing process.

However, in this case, the number of man-hours increases due to the step of removing fingerprints, resulting in problems such as increased cost and decreased quality.

[Object of the invention] The present invention has been made in view of the above problems, and includes:
The purpose of the present invention is to provide a rolled plate made of copper and prepared alloy that is resistant to fingerprints and handprints.

[Background of the Invention] The present invention relates to a rolled plate made of aluminum or an aluminum alloy, by roughening the surface to some extent and forming the peaks (convex portions) of the surface irregularities into a sharp shape.
We have obtained the knowledge that the fingerprint resistance of rolled plates can be improved, and have already applied for a patent (Japanese Patent Application No. 167158/1982). after that,
Similar effects were found for rolled plates made of copper and prepared alloys.

Here, as a criterion for evaluating the surface roughness of a rolled plate, as shown in Fig. 1, the maximum roughness Rmax, that is, 1
The height of the highest peak M within the inch length, and the peak M having a height of 1.5 μm or more within the 1 inch length,
M,...1M number (hereinafter simply referred to as the number of mountains)
was adopted.

Also, the shape of the mountains M, M, ...2M, that is, the mountain M.

As shown in Fig. 2, the acute angles of M, . . . 1M,
), (B).

However, for the mixed type (A), the height difference between the tip of the tip S and the base P is Δh months or more than 5 μm, and for the mixed type (B), the difference in height between the tip of the tip S and the base P is Δh.
is smaller than 1.5μ ceramic. These mountains M, M,
...1M shape is detected by, for example, a surface roughness meter.

The inventor conducted a test using the above criteria, and found that the maximum thickness Rtaax was 2μ or more, and the number of mountains M, M, . . . 1M was 15 or more,
In addition, good anti-fingerprint properties were observed in rolled plates made of copper and tempered alloys in which the ridges M had a sharp shape classified as a sword-point type or a mixed type (A).

The reason for this is thought to be that under the above setting conditions, the contact area of the worker's hand with the surface of the rolled plate becomes smaller. In addition, if the maximum roughness a 1llax exceeds 161zi, good anti-fingerprint properties can be obtained, but sufficient mass productivity cannot be obtained with the current production equipment, so the maximum roughness R11ax should be 2 to 16μ- It is preferable to set it within the range of . For the same reason, the number of mountains M, M,...1M is
It is desirable to set the number in the range of 15 to 150.

Also, the maximum roughness Rff1ax and the number of peaks M, M, ...1M are within the above setting range within a length of 1 inch in all directions, that is, the peaks (or valleys) are independent. Ideally, it should have a conical shape, but the maximum roughness Rw
From the viewpoint of ease of measurement of the number of ax and peaks M, M, ...1M and mass production of rolled plates, at least 62 directions,
In other words, it is sufficient that it falls within the above-mentioned setting range in directions parallel and perpendicular to the rolling direction.

Methods for roughening a rolled plate include (+) rolling with a rolling roll with a roughened surface and transferring the rough surface shape of the roll surface to the rolled plate; (ii) chemical treatment after rolling; Treatment (etching, etc.) or electrochemical treatment may be considered, but the iD method increases the number of steps and costs, so it is disadvantageous in practice.

[Structure of the Invention] Based on the above-mentioned findings, the present invention is based on the above-mentioned findings, and the present invention is based on the above-mentioned findings. 2 μm or more, the number of the peaks having a height of 1.5 μm or more within the 1 inch length is 15 or more, and the center is sharp. The object of the present invention is to provide a rolled sheet made of copper and copper alloy that has excellent fingerprint resistance and is characterized by having a four-node surface roughness formed by a roll.

As the above-mentioned rolling roll, for example, jllll! lllll
The surface of the steel roll is roughened by means such as shot blasting and electric discharge machining.

In addition, the rolling reduction ratio when rolling a rolled plate with a roughening roll is
In the case of rolled plates made of prepared alloy, depending on the breed,
The range of 0.15 to 3% per pass is preferable, and it is also possible to carry out the rolling process multiple times if necessary.

Examples] As examples of the present invention, various maximum roughness RIIlax,
Brass with number and shape of mountains (70% copper: 30% zinc)
The results of visually determining the fingerprint resistance of the rolled plate (1 mm thick) made by %) are shown in the first page on the next page, together with the quality of mass production.
Shown in the table.

In the margin table 1 below, invention material No., l ~ If are Rmax
.

The rolls were rolled using rolling rolls having various rough surface shapes so that the number of ridges and the shape of the ridges were all within the set range of the present invention. Further, in Table 1, rolled plates having at least one evaluation criterion outside the setting range of the present invention are shown as Comparative Materials No. 1 to 5. Among these, comparative materials No. 1 and 1 were rolled with rolling rolls for B C4, and comparative materials No. 2 and C were rolled with rolling rolls for comparative materials No. 2 and C. The fingerprint resistance was visually evaluated according to the evaluation criteria shown in Table 2.

Table 2 Evaluation criteria for fingerprint resistance (Note) Evaluation was made using actual human fingerprints.

From Table 1, the invented material is the comparative material N, which has been frequently used in the past.
It can be seen that the fingerprint resistance is superior to that of 1.0 and 1.2. Also, even if the shape of the peaks is made into a sword-point shape like in comparison material No. 3, if Rwax is small or the number of peaks is small,
Fingerprints were visible to a large extent, and on the contrary, comparison material No. 4.5
Even when Ra+ax and the number of peaks are within the set range, if the shape of the peaks is a metal mold or a mixed type (B), fingerprints can be clearly observed.

On the other hand, although invention materials No. and ll have good anti-fingerprint properties, RIllax is too large or the number of peaks is too large, making it difficult to mass-produce with the current production equipment due to the limit of the transfer ability and clogging of the roll. Sexuality decreases. Note that the above-mentioned tendency was the same for copper alloys other than brass and copper rolled plates.

[Effects of the Invention] As explained above, in the present invention, the surface of the rolled plate made of copper and prepared alloy is roughened to some extent, and the ridges on the surface of the rolled plate have a sharp shape. , the fingerprint resistance of the rolled plate can be improved. This makes it possible to eliminate the step of removing fingerprints during the manufacturing process, thereby reducing costs and improving productivity.

[Brief explanation of drawings]

FIG. 1 is an enlarged schematic diagram showing the surface shape of a rolled plate, and FIG. 2 is an enlarged schematic diagram showing the effect of ridges on the surface of the rolled plate. M...Mountain.

Claims (1)

[Claims] (1) The surface is rolled with a roughened rolling roll, and the maximum roughness within a length of 1 inch in directions parallel and perpendicular to the rolling direction is 2 μm or more, and the length of the 1 inch is The surface roughness is adjusted by the rolling roll so that the number of ridges having a height of 1.5 μm or more within the area is 15 or more, and the ridges have a sharp shape. Copper and copper alloy rolled plate with excellent fingerprint resistance.