JP2002285264A - Copper alloy for slide fastener - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide copper alloy for slide faster having excellent corrosion resistance, high hardness and high strength, also having excellent cold workability, and further having excellent discoloration resistance under an atmospheric environment or under various corrosive environments. SOLUTION: The copper alloy for slide fastener has a composition represented by the general formula: Cua Znb Xc (wherein, X is at least one element selected between Si and Al; a is the balance and b and c satisfy, by mass%, 10<b<35 and 0.3<c<3.5; and inevitable impurities can be contained). In addition, at least one element selected from Sn, Fe, Mn, Ti and Ni can be incorporated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copper alloy for a slide fastener applied to a slide fastener component such as an element of a slide fastener, a fastener, a slider, a pull and the like. Further, the present invention relates to a copper alloy for a slide fastener having excellent corrosion resistance, high hardness, high strength, excellent cold workability, and excellent discoloration resistance under an atmospheric environment or various corrosive environments.

[0002]

2. Description of the Related Art Copper alloys that are mainly used as components of conventional slide fasteners include copper-zinc alloys such as red copper, brass, etc., and copper such as white nickel, which is white in color. -A zinc-nickel alloy. The appearance of the slide fastener is important in terms of its intended use, and it is necessary that there be no factors that impair the good design.

[0003] In general, copper alloys have excellent corrosion resistance in an atmospheric environment or in various corrosive environments, because a copper oxide called patina or a green, red or black compound coating of a basic copper salt is coated on the surface. Is formed.
However, since a colored compound film is formed on the surface in an air environment or in various corrosive environments, there is a problem that the original color tone of the alloy is different and the design property is deteriorated due to discoloration. Therefore, as a general method for preventing discoloration of a copper alloy, the above problem is prevented by applying a rust inhibitor such as benzotriazole (BTA) or performing various plating. However, in the case of applying a rust inhibitor such as benzotriazole (BTA), an additional coating operation must be added to the finishing step, which increases the processing cost and also requires waste liquid treatment. There is a problem that the burden on the surface is large. Further, when the latter various plating is applied, there is a problem such as peeling or abrasion of the plating film when using the slide fastener.

[0004] In addition, the color change resistance called stainless steel is improved.
Excellent copper-tin alloy (Cu_bal.Sn _5-7Al_7-9) Is open
Although it is emitted, cold workability due to the presence of β phase
Problems, and currently apply to slide fasteners
Is difficult.

[0005]

Therefore, the present invention has excellent corrosion resistance, high hardness, high strength, and excellent cold workability.
It is an object of the present invention to provide a copper alloy for a slide fastener which is excellent in discoloration resistance under an atmospheric environment or various corrosive environments. In particular, an object of the present invention is to provide a copper alloy for a slide fastener which is excellent in discoloration resistance and can maintain the original color tone of the alloy.

[0006]

The present invention has the following constitution.

(1) General formula: Cu _a Zn _b X _c (where X
Is at least one element selected from Si and Al;
b and c are% by mass, a is the balance, 10 <b <35, 0.
3 <c <3.5, which may contain unavoidable elements).

(2) In the above general formula, the balance is 1
The copper alloy for a slide fastener according to the above (1), which contains at least one element selected from Sn, Fe, Mn, Ti, and Ni within a range of not more than mass%.

(3) a * and b * whose color tone before and after the mixed gas exposure test and the constant temperature / humidity test indicate the color tone specified by JIS Z 8729 are -5 <a * <5, 10 <b * <
30. The copper alloy for a slide fastener according to the above (1) or (2), which is 30.

(4) The color difference before and after the mixed gas exposure test and the constant temperature / humidity test is less than 30 based on L *, a *, b * specified in JIS Z 8729.
The copper alloy for a slide fastener according to any one of (1) to (3).

(5) General formula: Cu _a Zn _b X _c (where X
Is at least one element selected from Si or Si and Al, a, b, and c are mass%, a is the balance, 10 <b <
35, 2 ≦ c <3.5, which may contain an unavoidable element).

(6) The copper for a slide fastener according to (5), wherein at least one element selected from the group consisting of Sn, Fe, Mn, Ti and Ni is contained within the range of 1% by mass or less in the above general formula. alloy.

(7) The color difference before and after the mixed gas exposure test is less than 30 based on L *, a * and b * specified in JIS Z 8729, and the color difference before and after the constant temperature and constant humidity test is less than 10. The copper alloy for a slide fastener according to (5) or (6).

(8) The copper alloy for a slide fastener according to any one of the above (1) to (7), which is an α-phase monolayer at room temperature.

(9) A copper alloy for a slide fastener, wherein the alloy according to any one of the above (1) to (8) is used for at least one of an element, a fastener, a pull, and a slider which are components of the slide fastener.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The copper alloy for a slide fastener according to the present invention will be described below. In the present invention, the object of the present invention can be achieved by using the composition represented by the above general formula.

Zn has the effects of improving the mechanical properties of the alloy by solid solution strengthening, improving the work hardening characteristics, and lowering the price of the alloy. If the amount is less than the above range, the cost reduction of the alloy becomes insufficient, and the alloy strengthening becomes insufficient. On the other hand, if it is larger than the above range, the crystal structure becomes α + β, so that sufficient cold workability cannot be ensured, and the season cracking resistance decreases.

The X element is at least one element selected from Si and Al, and these elements have an effect of improving discoloration resistance by forming a stable colorless and transparent oxide film on the surface. It also has the effect of lowering the melting point,
It has the function of improving castability and suppressing the evaporation of zinc from the molten metal. In addition, the solid solution strengthening has the effect of improving the mechanical properties of the alloy. If the amount is less than the above range, the discoloration resistance of the alloy becomes insufficient and the alloy strengthening becomes insufficient. If the content is larger than the above range, the crystal structure becomes α + β
And the cold workability cannot be sufficiently ensured. Also,
Based on having sufficient mechanical properties such as hardness and strength, considering discoloration resistance, when the X element is Si alone, it is preferably 2% by mass or more as described above. When Al coexists with Si as an X element, there is no particular problem even if the lower limit of Si is 0.3% by mass.

In the above general formula, the balance C
Sn, Fe, Mn, Ti, Ni within the range of 1% by mass of u
Even if it is substituted with at least one element selected from the group consisting of, there is no problem in terms of alloy properties, and an alloy having the properties aimed at by the present invention can be provided.

The alloy according to the present invention has a -5 <a ^* <5, 10 <b ^* <based on the L ^* value, a ^* value, and b ^* value color system chromaticity diagram specified in JIS Z 8729. It is in the range of 30.

The color tone referred to in the present specification is defined by JIS
Lightness index L ^* (lightness: Elster) and chromaticity index a ^* (greenish to reddish: Aster), b ^* (blued to yellowish: expressed in the object color display method specified in Z 8729) Beaster).

The alloy of the present invention has an original color tone of -5 <
a ^* <5, 10 <b ^* <30, and preferably after the mixed gas exposure test and the constant temperature / humidity test described below. If the above test also within the above range, during the manufacture of the slide fastener, during storage,
It can be said that the alloy is hardly discolored by any processing that is usually performed, such as during use, and hardly discolored over a long-term use (in consideration of washing, dry cleaning, etc.), and the original color tone of the alloy is maintained. More specifically, the color difference between before and after the mixed gas exposure test and the constant temperature and humidity test was determined by JIS.
More preferably, it is less than 30 based on L ^* , a ^* and b ^* specified by Z 8729. Furthermore, it is particularly preferable that the number of dyes in a constant temperature and humidity test is less than 10. The above definition is based on the change in color, but this rule takes into account not only the change in color but also the difference in lightness and darkness, and specifies more excellent discoloration resistance. In the present invention, a specific color difference (ΔL ^* a ^* b ^* ) is obtained by the following equation 1.

[0023]

(Equation 1) However, ΔL ^* , Δa ^*, and Δb ^* indicate the difference between the measured values before and after the mixed gas exposure test and the constant temperature / humidity test.

Further, since the structure of the alloy of the present invention is an α-phase single phase, it is possible to provide an alloy having better cold workability.

Hereinafter, a slide fastener which is an application of the alloy of the present invention will be specifically described with reference to the drawings.

FIG. 1 is a conceptual view of a slide fastener. As shown in FIG. 1, the slide fastener has a pair of fastener tapes 1 and 1 and a core of the fastener tape 1 having a core 2 formed at one end. An element 3 caulked and fixed (attached) to the portion 2 at predetermined intervals, and an upper stopper 4 and a lower stopper 5 caulked and fixed to the core 2 of the fastener tape 1 at the upper and lower ends of the element 3 And a slider 6 which is disposed between a pair of opposing elements 3 and is slidable in the vertical direction for engaging and disengaging the elements 3. In the above, the core 2 of the fastener tape 1
The slide fastener chain 7 is provided with the element 3 mounted thereon. The slider 6 shown in FIG.
Although not shown, a long body consisting of a plate-like body having a rectangular cross section is subjected to press working in multiple stages, cut at predetermined intervals, a slider body is produced, and a spring and a puller are attached as necessary. It was done. Further, a tab is also punched out of a plate-like body having a rectangular cross section in a predetermined shape, and this is caulked and fixed to the slider body. Note that the lower stopper may be a separable bottom end stop consisting of a butterfly pin, a box pin, and a box body so that the pair of slide fastener chains can be separated by a slider separating operation.

FIG. 2 is a view showing a method of manufacturing the slide fastener element 3, the upper stopper 4 and the lower stopper 5 shown in FIG. 1, and a method of attaching the fastener tape 1 to the core 2. As shown in FIG. As shown in FIG.
The deformed wire 8 having a character shape is cut into predetermined dimensions, and is formed by press forming to form an engaging head 9, and thereafter, by crimping both legs 10 to the core 2 of the fastener tape 1. , Will be installed. The upper stopper is formed by cutting a rectangular wire 11 (rectangular wire) having a rectangular cross section into predetermined dimensions, forming a substantially U-shaped cross section by bending, and then caulking the core 2 of the fastener tape 1. , Will be installed. The lower stopper is attached by cutting the deformed wire 12 having a substantially X-shaped cross section into predetermined dimensions and then crimping the core wire 2 of the fastener tape 1. In the figure, the element 3, the upper and lower stoppers 4, 5 are simultaneously attached to the fastener tape 1, but in practice, the element 3 is continuously attached to the fastener tape 1, and the fastener chain is first attached. The fastener 3 is manufactured, the element 3 in the fastener attachment area of the fastener chain is removed, and a predetermined fastener 4 or 5 is attached near the element 3 in this area.

In order to manufacture and mount as described above,
Elements, stoppers, sliders, tabs, and the like, which are components of the slide fastener, need to be made of an alloy having excellent cold workability.

[0029]

EXAMPLES Hereinafter, the present invention will be described in detail with reference to Examples, but it is needless to say that the present invention is not limited to the following Examples.

Examples In Examples 1 to 7 of the present invention shown in Table 1, test materials were prepared and evaluated as follows. Comparative Example 1 in Table 1
The same applies to Nos. To 5.

[0031]

[Table 1] Raw materials include pure Cu (99.99%) and pure Zn (9
9.9%), pure Al (99.99%), and pure Si were weighed to a predetermined composition. This was put into an alumina crucible, melted at a high frequency in an argon gas atmosphere, and poured into a copper mold of φ40 mm to produce an ingot. The obtained ingot was cut into a length of 75 mm to obtain a billet for extrusion. Extrusion is
Performed at a billet temperature of 800 ° C and a container temperature of 530 ° C
A 26 mm extruded material was made. 800 for the obtained extruded material
℃, homogenization treatment for 1 hour, furnace cooling, thickness about 5mm
The sample material was cut into a disk shape, and the cut surface was processed with a lathe to prepare a test material and the test surface.

The structure in Table 1 was obtained by observing the structure of the test surface of the test material. The test materials of the present invention are all α
It is a single phase and can provide a material having good cold workability.
When the second phase was present as in the comparative example, cracks and the like occurred during cold working, but for the materials of the examples of the present invention,
No cracks or the like were observed. For example, when used as an element for a slide fastener, the Y-shaped element is attached by caulking when attaching to a fabric, but after the attachment, the element can be firmly attached without cracking or the like.

The cold working in Table 1 is the result of observing the presence or absence of cracks on the surface by applying a strain of 80% to the obtained test material by a cold compression test. In Table 1, ○ indicates that no cracks or the like were present on the surface, and X indicates that cracks or the like were present on the surface. It turns out not to be. From this, as described above, in the case of the element of the slide fastener, a maximum of 80
%, The material of this example shows no problem even if a strain of 80% is given in the cold state.

Further, the 80% rolling hardness is 80% for the test material.
% Is the result of measuring the hardness after rolling. The hardness (DPN) is indicated by a value DPN measured by a minute Vickers hardness tester under a load of 25 g. The material of this example has a higher hardness than the bronze (Comparative Example 2) and the brass (Comparative Example 3) which are currently used as components for slide fasteners, and has good hardness and strength as components for slide fasteners. It can be seen that it has mechanical characteristics such as

The discoloration resistance test shown in Table 2 was carried out in such a manner that the test surface of the obtained test material was mirror-polished with SiC polishing paper and diamond paste, and the test surface was subjected to a colorimeter (Minolta Co., Ltd.). ), CR-300).
L ^* , a ^* , and b ^* specified in Z8729. In addition, the following various tests were performed, and the test surface after the test was measured in the same manner as described above, and indicated by L ^* , a ^* , and b ^* specified in JIS Z8729. JISZ 8 of the test surface of various test materials and the test surface of various test materials after various tests
Table 2 shows the measurement results of L ^* , a ^* , and b ^* specified in 729. The color difference (ΔL ^* a ^* b ^* ) is L ^* , JIS Z 8729 before and after each test,
The measurement results of a ^* and b ^* were obtained by substituting into the following equation 1.

[0036]

(Equation 2)

[0037]

[Table 2]

In the constant temperature and humidity test, the test surface of the obtained test material was mirror-polished with SiC polishing paper and diamond paste, and the temperature was 80 ° C. and the humidity was 80% R.C. H constant atmosphere 24
After exposure for a period of time, the test surface of the test material was measured with a colorimeter.

In the mixed gas exposure test, the test surface of the obtained test material was mirror-polished with SiC polishing paper and diamond paste in the same manner as described above, and 50% HNO ₃ , 10% N
The three kinds of reagents, H ₃ and 10% HNaSO ₃ , were placed in a desiccator, and the test material was exposed to the atmosphere at room temperature for 24 hours, and the test surface of the test material was measured with a colorimeter. .

From the results of the constant temperature and humidity test shown in Table 2, when the alloy of the present invention was used as a slide fastener part, it was able to provide a material which was not easily discolored when washed with warm water, and was transported and stored in a humid atmosphere (factory). , Warehouse, store etc.)
It is possible to provide a material that is not easily discolored even when the cleaning is performed.
It can be seen that it can be suppressed to about 50% to about 80% as compared with the bronze and brass of the comparative example.

Further, from the results of the mixed gas exposure test shown in Table 2, it is possible to provide a material which does not easily discolor even under a severe environment. From this fact, it can be seen that when used as a slide fastener, it is particularly useful when performing dry cleaning, post-dyeing, or the like in which a chemical is introduced. It is also found that the method is useful for processing in an ammonia atmosphere using a shape memory suit or the like. It can be seen that it can be suppressed to about 1/2 to 1/3 or less as compared with the bronze and brass of the comparative example.

[0042]

According to the copper alloy for a slide fastener of the present invention, it has excellent corrosion resistance, high hardness, high strength, excellent cold workability, and resistance to discoloration under an atmospheric environment or various corrosive environments. An alloy having excellent properties can be provided. In particular,
ADVANTAGE OF THE INVENTION According to the copper alloy for slide fasteners of this invention, the alloy excellent in discoloration resistance which can maintain the original color tone of an alloy can be provided.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a slide fastener to which the present invention is applied.

FIG. 2 is an explanatory view of a method of attaching a slide fastener element, an upper stopper and a lower stopper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fastener tape 2 Core part 3 Element 4 Upper stop 5 Lower stop 6 Slider 7 Slide fastener chain 8 Deformed line 9 Engagement head 10 Leg 11 Rectangular line 12 Deformed line

Claims (9)

[Claims] 1. A general formula: Cu _a Zn _b X _c (where X is S
i, at least one element selected from Al, a, b,
c is mass%, a is the balance, 10 <b <35, 0.3 <
c <3.5, which may contain unavoidable elements). 2. The copper alloy for a slide fastener according to claim 1, wherein the general formula contains at least one element selected from the group consisting of Sn, Fe, Mn, Ti, and Ni in a range of 1% by mass or less as a balance. 3. The a * and b * values indicating the color tone defined by JIS Z 8729 before and after the mixed gas exposure test and the constant temperature / humidity test are -5 <a * <5 and 10 <b * <30.
The copper alloy for a slide fastener according to claim 1 or 2, wherein 4. The method according to claim 1, wherein a color difference before and after the mixed gas exposure test and the constant temperature / humidity test is less than 30 based on L *, a *, and b * specified in JIS Z8729. The copper alloy for the slide fastener described. 5. A general formula: Cu _a Zn _b X _c (where X is S
i or at least one element selected from Si and Al, a, b, and c are mass%, a is the balance, 10 <b <3
5, 2 ≦ c <3.5, which may contain an unavoidable element). 6. In the above general formula, 1% by mass is the balance.
The copper alloy for a slide fastener according to claim 5, comprising at least one element selected from the group consisting of Sn, Fe, Mn, Ti, and Ni within the following ranges. 7. The color difference before and after the mixed gas exposure test is J
The copper alloy for a slide fastener according to claim 5 or 6, wherein the copper alloy has a color difference of less than 30 based on L *, a *, and b * specified in IS Z 8729 and a color difference before and after a constant temperature and humidity test. 8. The copper alloy for a slide fastener according to claim 1, wherein the copper alloy is an α-phase monolayer at room temperature. 9. A copper alloy for a slide fastener, wherein the alloy according to any one of claims 1 to 8 is used for at least one of an element, a fastener, a pull, and a slider which are components of the slide fastener.