HK1171345B - Zipper component and slide zipper - Google Patents

Abstract

A zipper component (1) comprising a component body (2) made of a metal and a metal plating film (3) provided on the surface of said component body. In this zipper component (1), at least a part of said component body (2) has been thermally treated before bending and thus said metal plating film (3) has a recrystallized structure wherein at least a part thereof has been recrystallized. Since the ductility of the metal plating film (3) can be improved thereby, when the zipper component (1) is bent, the metal plating film (3) can be deformed to follow the deformation of the component body (2). Therefore, the occurrence of crevicing or cracking in the metal plating film (3) can be prevented.

Description

Slide fastener component and slide fastener

Technical Field

The present invention relates to a fastener component for a slide fastener, at least a portion of which is subjected to bending such as caulking, and a slide fastener using the fastener component after bending, and more particularly to a fastener component having a metal component body and a metal plating film disposed on a surface of the component body, and a slide fastener using the fastener component after bending.

Background

In general, a slide fastener uses various fastener components such as a fastener element, an upper stop, a lower stop, a separable bottom end stop such as a box pin and a box pin, and a slider, and these fastener components often include a metal component.

One of such metal fastener components is a fastener element. Generally, a metallic fastener element is formed to have a substantially Y-shape by press-forming a flat plate material made of metal such as copper or a copper alloy having a predetermined thickness to form a coupling head or the like, and punching or the like the flat plate material. The obtained metal fastener element is attached to the fastener tape by caulking both the leg portions inward with the fastener tape sandwiched between the right and left leg portions.

Further, a metallic bottom stop as another component of a slide fastener is described in, for example, U.S. patent No. 2,884,691 (patent document 1). The lower stop described in patent document 1 is formed as follows: a wire having a circular cross section is subjected to rolling processing to deform the cross section of the wire into a substantially X-shape (or a substantially H-shape), and then the wire is cut into a predetermined length. The obtained bottom stop having a substantially X-shaped (or substantially H-shaped) cross section is attached to the fastener tape by caulking the arm portions extending out of 1 set to the left and right, respectively, toward the fastener tape.

Further, a fastener component such as a metal top stop, a female pin, or a female box is attached to a fastener tape by forming or cutting a metal material such as copper, a copper alloy, an aluminum alloy, or a zinc alloy into a predetermined shape, and then performing caulking processing on the obtained fastener component.

On the other hand, in the case of a metal slider, there are cases where: the slider body and the tab having a predetermined shape are formed by die casting using a metal such as a zinc alloy or an aluminum alloy, and the tab is attached to the slider body by further performing caulking or bending on a part of the obtained slider body.

Patent document 1: specification of U.S. Pat. No. 2,884,691

Conventionally, in order to impart new appearance characteristics to a metal article and to improve corrosion resistance thereof, a plating treatment is performed on the article to form a plated film on the surface of the article. Such a plated film has been often formed on various metallic fastener components constituting a slide fastener.

For example, in order to protect a component body portion of a base material, and to provide a desired color tone, a fastener component such as a fastener element and an upper and lower stop made of a metal such as copper or a copper alloy has a metal plating film made of a copper-zinc alloy (brass) or a white metal plating film made of a copper-tin alloy or a tin-nickel alloy formed on the surface thereof.

Further, for example, in a fastener element or upper and lower stoppers made of a metal such as an aluminum alloy or a fastener constituent member such as an upper and lower stopper or a slider made of a metal such as a zinc alloy, a metal plating film made of copper (pure copper) or a copper-zinc alloy may be formed on the surface of the member body in order to impart a desired color tone and to improve corrosion resistance.

However, the plating film made of metal as described above is generally high in hardness. Therefore, when a metal plating film is formed on a fastener component such as a fastener element or an upper and lower stop, and then the fastener component having the metal plating film is subjected to bending such as caulking for attaching the fastener tape or a tab to a slider body, the metal plating film is likely to form cracks or fissures.

If cracks or cracks are formed in the metal plating film in this way, the blank of the base is exposed from the portion where the cracks or cracks occur, although the metal plating film is formed in order to impart a desired color tone, and therefore, there is a problem that the appearance of the fastener component is deteriorated, and the appearance characteristics and the appearance quality of the fastener are impaired.

Further, when a metal plating film is formed on the surface of a fastener component in order to improve corrosion resistance, there is a problem that the base material (base material) of the fastener component is easily corroded due to the occurrence of cracks or cracks.

In particular, in recent years, in order to give a high-grade feeling to a zipper attachment product using a zipper, large-sized zipper elements, upper and lower stoppers, and the like, which are flat in appearance, have come to be used for the zipper. However, when such a large-sized fastener element and upper and lower retainers are fixed by caulking to a fastener tape, the amount of plastic deformation by the caulking process is large, and therefore, cracks and fissures are conspicuously generated in the metal plating film, and the sizes of the cracks and fissures are large, so that the problem of the appearance and the problem of corrosion of the fastener component parts as described above are further serious.

Disclosure of Invention

The present invention has been made in view of the above-described conventional problems, and a specific object thereof is to provide: a slide fastener component in which a metal plating film formed on the surface of a component body is less likely to cause cracking or splitting even when subjected to bending, a slide fastener using the slide fastener component after bending, and a method for manufacturing the slide fastener component.

In order to achieve the above object, a fastener component provided by the present invention is a fastener component for a slide fastener, and as a basic structure, a metal plating film is formed on a surface of a metallic member main body, at least a part of the member main body is bent after the metal plating film is formed, the main characteristic of the component for slide fastener is that the component main body is made of copper or copper-zinc alloy, the metal plating film is made of a copper-zinc alloy containing zinc in an amount larger than that of the component main body, the metal plating film has a recrystallized structure in which at least a part of the crystal structure is recrystallized by performing a heat treatment before the bending, the surface layer portion of the component main body portion on the metal plating film side has a diffusion layer formed by diffusing zinc contained in the metal plating film by the heat treatment.

In particular, in the fastener constituent member according to the present invention, it is preferable that the recrystallized structure is formed by: after the metal plating film is formed on the surface of the component body in a columnar crystal structure, the metal plating film is subjected to the heat treatment to recrystallize at least a part of the columnar crystal structure.

In the slide fastener component according to the present invention, the component body preferably contains at least 75 wt% to 100 wt% of copper and 0 wt% to 25 wt% of zinc.

In the slide fastener constituent member according to the present invention, the member main body may include: a metal body made of zinc or a zinc-based alloy; and a base plating film made of copper and disposed on a surface of the metal body. Alternatively, the component main body may include: a metal body made of an aluminum alloy; a first base plating film made of zinc and provided on the surface of the metal body; and a second base plating film made of copper and disposed on a surface of the first base plating film.

Further, in the slide fastener constituent member according to the present invention, it is preferable that the metal plating film is made of at least 1 alloy selected from the group consisting of a copper-zinc alloy, a copper-tin alloy, and a tin-nickel alloy.

In the slide fastener constituent member of the present invention, it is preferable that the metal plating film having the recrystallized structure has a film thickness of 1 μm or more and 10 μm or less.

Preferably, the metal plating film having the recrystallized structure has a vickers hardness of Hv50 or more and Hv100 or less.

Further, it is preferable that a diffusion layer formed by diffusing a metal contained in the metal plating film is provided in a surface layer portion of the member main body portion on the metal plating film side.

Further, it is preferable that the fastener constituent member is at least 1 member selected from the group consisting of a fastener element, a stop, a separable bottom end stop, and a slider.

Further, according to the present invention, a slide fastener can be provided which is used by bending the fastener constituent member having the above-described structure.

A method for manufacturing a slide fastener component according to the present invention is a method for manufacturing a slide fastener component for a slide fastener, the method including, as a basic configuration, disposing a metal plating film on a surface of a metallic component body, and bending at least a part of the component body after forming the metal plating film, and is characterized by including:

forming the metal plating film on the surface of the component main body; and

before the bending, a heat treatment is performed to heat the metal plating film to a temperature equal to or higher than a recrystallization temperature, thereby forming a recrystallized structure in which at least a part of the crystal structure of the metal plating film is recrystallized.

In particular, the method for manufacturing a slide fastener component according to the present invention preferably includes: forming the metal plating film disposed on the surface of the component main body portion into a columnar crystal structure; and forming the recrystallized structure by performing the heat treatment on the metal plating film having the columnar crystalline structure.

In the method for manufacturing a slide fastener constituent member according to the present invention, it is preferable that the metal plating film is made of a copper-zinc alloy; and heating the metal plating film to 300 ℃ or more and 400 ℃ or less in the heat treatment.

Further, the method for manufacturing a fastener constituent member according to the present invention may include: the metal plating film is made of a copper-tin alloy; and heating the metal plating film to 400 ℃ or higher and 500 ℃ or lower in the heat treatment. Alternatively, the manufacturing method of the present invention may include: the metal plating film is made of a tin-nickel alloy; and heating the metal plating film to 500 ℃ or higher and 600 ℃ or lower in the heat treatment.

Further, the manufacturing method of the present invention preferably includes: the heat treatment is performed so that the Vickers hardness of the metal plating film, which is equal to or higher than Hv120, is equal to or higher than Hv50 and equal to or lower than Hv 100.

In the slide fastener component according to the present invention, after a metal plating film is formed on the surface of the metal component body, the metal plating film is heat-treated. Thus, the metal plating film formed on the fastener component has a recrystallized structure in which at least a part of the crystal structure is recrystallized.

By having a recrystallized structure in at least a part of the metal plating film, the metal plating film has excellent ductility as compared with the metal plating film before heat treatment formed on the surface of the member body, and therefore, the metal plating film can be relatively easily elongated, and cracks or cracks can be made less likely to occur in the metal plating film.

Therefore, in the slide fastener component of the present invention, when the component body portion having the metal plating film as described above disposed on the surface thereof is bent, the metal plating film can be easily deformed in accordance with the deformation of the component body portion, and therefore, the metal plating film can be made difficult to generate or not to generate cracks or cracks.

Therefore, the zipper component can solve the problem caused by the cracks and the fissures of the metal plating film in the conventional zipper component, namely the problem of poor appearance of the zipper component, and can uniformly provide the color of the metal plating film. Further, the zipper component can easily solve the conventional problem that the base material of the zipper component is easily rotted.

In particular, in the slide fastener constituent member according to the present invention, the recrystallized structure is formed by forming the metal plating film into a columnar crystal structure on the surface of the member body, and then heat-treating the metal plating film to recrystallize at least a part of the columnar crystal structure. The present invention can be preferably applied particularly to the case where a metal plating film is grown in a columnar crystal structure.

That is, the slide fastener constituent member of the present invention, which recrystallizes at least a part of the metal plating film having the columnar crystal structure, has a metal plating film having superior ductility as compared with the conventional metal plating film having only the columnar crystal structure. Therefore, the metal plating film formed on the fastener component can be made less likely to crack or tear.

The slide fastener constituent member of the present invention can be suitably applied to a case where the member main body is made of copper or a copper-zinc alloy. Copper and copper-zinc alloys have excellent ductility, and therefore can be bent relatively easily by caulking or the like, and have been widely used as materials for fastener constituent members such as fastener elements and upper and lower stoppers. When a metal plating film having a recrystallized structure is disposed on the surface of such a fastener component made of copper or a copper-zinc alloy, it is possible to efficiently prevent the metal plating film from cracking or splitting when the component body is bent.

In particular, in this case, since the component main body contains at least 75 wt% or more and 100 wt% or less of copper and 0 wt% or more and 25 wt% or less of zinc, stress corrosion cracking can be more reliably prevented from occurring in the component main body subjected to bending processing.

The slide fastener constituent member of the present invention can be suitably applied to a slide fastener constituent member in which the member main body has a metal body made of zinc or a zinc-based alloy; and a base plating film made of copper and disposed on the surface of the metal body. Zinc is generally inexpensive and can be easily formed into a desired shape by die casting, and therefore, it can be conveniently used as a material for a slide fastener component such as a separable bottom end stop, a slider, or the like. Further, since zinc has low corrosion resistance, when zinc or a zinc-based alloy is used as a metal base material, a base plating film containing copper having excellent corrosion resistance is formed on the surface of the metal body.

Even when a metal plating film having a recrystallized structure is disposed on the surface of such a slide fastener component having a metal body made of zinc or a zinc-based alloy and a base plating film, the occurrence of cracks or fissures in the metal plating film can be effectively prevented when the component body is bent.

Further, the fastener constituent member of the present invention can be suitably applied to the following cases: the component main body portion includes: a metal body made of an aluminum alloy; a first base plating film made of zinc and provided on the surface of the metal body; and a second base plating film made of copper and disposed on a surface of the first base plating film.

The aluminum-based alloy is lightweight. Therefore, by using the aluminum alloy as the metal base material of the fastener constituent member, the metal fastener constituent member can be extremely lightly configured. Therefore, the aluminum alloy can be used as a material for a fastener component such as a fastener element, an upper and lower stop, a slider, and the like.

Further, since the aluminum-based alloy is also low in corrosion resistance, when the aluminum-based alloy is used as a metal base material, a first base plating film made of zinc is formed on the surface of the metal body by electroless plating or the like, and a second base plating film made of copper excellent in corrosion resistance is formed on the surface of the first base plating film.

Even when the metal plating film having the recrystallized structure is disposed on the surface of the fastener component having the metal body made of the aluminum-based alloy and the first and second base plating films, it is possible to efficiently prevent the metal plating film from cracking or splitting when the component body is bent.

In the slide fastener constituent member of the present invention, for example, copper (pure copper), a copper-zinc alloy, and a white metal (for example, a copper-tin alloy, a tin-nickel alloy, nickel, chromium, palladium, rhodium, platinum, and the like) can be used as the material of the metal plating film, but in particular, the metal plating film of the present invention is preferably composed of at least 1 selected from the group consisting of a copper-zinc alloy, a copper-tin alloy, and a tin-nickel alloy having a relatively low recrystallization temperature range. By providing the metal plating film made of such a material with a recrystallized structure, the metal plating film can be prevented from cracking or splitting even when the fastener constituent member is bent, and therefore the fastener constituent member can have good appearance quality.

Further, in the slide fastener constituent member of the present invention, the metal plating film having the recrystallized structure has a film thickness of 1 μm or more and 10 μm or less, preferably 2 μm or more and 6 μm or less. By setting the thickness of the metal plating film to 1 μm or more (preferably 2 μm or more), the metal plating film can be formed stably and reliably.

Although the thicker the metal plating film is formed, the more stable the formation of the metal plating film can be, even if the thickness of the metal plating film is set to be larger than 10 μm, the thickness of the metal plating film is set to be 10 μm or less (preferably 6 μm or less) because the effect of improving the stability of the metal plating film and the appearance quality obtained by the metal plating film is not so large.

Further, in the slide fastener constituent member of the present invention, the metal plating film having the recrystallized structure has a vickers hardness of Hv50 or more and Hv100 or less. If the Vickers hardness of the metal plating film is Hv50 or more, it is possible to prevent the surface of the slide fastener component from being damaged, etc., and to maintain good appearance quality.

On the other hand, if the vickers hardness of the metal plating film is Hv100 or less, the metal plating film can be formed relatively flexibly to improve ductility of the metal plating film. Therefore, even when the amount of plastic deformation of the member body of the fastener constituent member is large due to the bending work when the fastener constituent member is bent, the occurrence of cracks or cracks in the metal plating film can be more reliably prevented.

In the slide fastener constituent member of the present invention, the surface layer portion of the member body on the metal plating film side has a diffusion layer formed by diffusing a metal contained in the metal plating film. Since the diffusion layer is provided on the surface layer portion of the member main body, the metal plating film can be made to conform to the member main body well, and the adhesion of the metal plating film to the member main body can be improved.

The fastener component of the present invention is particularly preferably applied to a fastener element, an upper stop, a lower stop, a separable bottom end stop such as a box pin and a box pin, and a slider.

The slide fastener according to the present invention is configured by bending the fastener constituent member having the above-described structure and using the bent member. Therefore, the slide fastener of the present invention has no (or very little) occurrence of cracks or cracks in the metal plating film of the fastener constituent member, and therefore, the fastener constituent member has a uniform color, is beautiful, and has excellent appearance characteristics and appearance quality.

Next, according to the method for manufacturing a component for a slide fastener of the present invention, a metal plating film is formed on the surface of the component body of the component for a slide fastener, and further, a heat treatment for heating the metal plating film to a recrystallization temperature or higher is performed before the bending process, thereby manufacturing the component for a slide fastener.

According to the manufacturing method of the present invention, the metal plating film disposed on the surface of the member body is heat-treated to recrystallize the crystal structure of the metal plating film, so that the metal plating film having a recrystallized structure in which at least a part of the crystal orientation is disordered can be easily formed. Since the metal plating film having such a recrystallized structure has improved ductility, it is possible to efficiently prevent the metal plating film from cracking or splitting when the slide fastener constituent member manufactured by the manufacturing method is bent.

In particular, in the method for manufacturing a slide fastener constituent member according to the present invention, the metal plating film disposed on the surface of the member body is formed into a columnar crystal structure, and the metal plating film having the columnar crystal structure is heat-treated to form a recrystallized structure. As described above, the present invention can be applied particularly preferably to the case where the metal plating film is grown to have a columnar crystal structure. That is, since ductility of the metal plating film can be improved by heat-treating the metal plating film formed in the columnar crystal structure, cracks and cracks can be made less likely to occur in the metal plating film after the heat treatment.

In the method for manufacturing a component for a slide fastener according to the present invention, the metal plating film is made of a copper-zinc alloy, and the metal plating film is heated to 300 ℃ or higher and 400 ℃ or lower by a heat treatment. Thus, when the metal plating film is made of a copper-zinc alloy, a recrystallized structure can be easily and stably formed in at least a part of the metal plating film.

Further, in the method for manufacturing a component for a slide fastener according to the present invention, the metal plating film is made of a copper-tin alloy, and the metal plating film is heated to 400 ℃ or higher and 500 ℃ or lower by a heat treatment. Thus, when the metal plating film is made of a copper-tin alloy, a recrystallized structure can be easily and stably formed in at least a part of the metal plating film.

Further, in the method for manufacturing a component for a slide fastener according to the present invention, the metal plating film is made of a tin-nickel alloy, and the metal plating film is heated to 500 ℃ or higher and 600 ℃ or lower by a heat treatment. Thus, when the metal plating film is made of a tin-nickel alloy, a recrystallized structure can be easily and stably formed in at least a part of the metal plating film.

In the production method of the present invention, the heat treatment is performed so that the vickers hardness of the metal plating film, which is equal to or higher than Hv120, is equal to or higher than Hv50 and equal to or lower than Hv 100. By setting the vickers hardness of the metal plating film to Hv50 or more, it is possible to prevent the surface of the slide fastener component from being damaged, and the like, and maintain good appearance quality. On the other hand, when the vickers hardness of the metal plating film is set to Hv100 or less, the metal plating film can be more reliably prevented from cracking or splitting when the fastener component is bent.

Drawings

Fig. 1 is a cross-sectional view schematically showing a cross section of a fastener constituent member before heat treatment.

Fig. 2 is a cross-sectional view schematically showing a cross section of the fastener constituent member after heat treatment.

Fig. 3 is a front view showing a fastener component constituting the slide fastener.

Fig. 4 is a sectional view showing a lower stopper.

Fig. 5 is an explanatory view schematically illustrating a bending process of the lower stop with respect to the fastener tape.

Fig. 6 is a flowchart for explaining a method of manufacturing a slide fastener constituent member in the embodiment of the present invention.

Detailed Description

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings by way of examples. The present invention is not limited to the embodiments described below, and various modifications can be made to the embodiments as long as the embodiments have substantially the same configuration and the same operational effects as those of the present invention.

Here, fig. 1 is a cross-sectional view schematically showing a state before heat treatment is performed on a fastener constituent member having a metal plating film formed on a surface of a member body, and fig. 2 is a cross-sectional view schematically showing a state after heat treatment is performed on the fastener constituent member.

The fastener constituent member 1 according to the present embodiment is a member constituting a fastener in which a base material of the member body 2 is made of metal, and at least a part of the member body 2 is subjected to bending such as caulking. Such a slide fastener component 1 includes, for example, as shown in fig. 3 of a normal slide fastener 10, a metal fastener element 11, a lower stop 12, an upper stop 13, a slider 14 (particularly, a slider body), an unillustrated insert pin, an unillustrated receptacle, and the like.

The metal fastener element 11 is generally manufactured as follows: a fastener element blank having a Y-shape in a front view is formed by sequentially cutting a long metal wire having a Y-shape in a longitudinal direction thereof at a desired thickness, and the fastener element blank is press-formed to form a coupling head, or a flat plate material made of metal such as copper or copper alloy having a predetermined thickness is press-formed to form a coupling head, and the flat plate material is die-cut.

The metal fastener element 11 thus manufactured is attached to the fastener tape 15 by performing bending work of plastically deforming both leg portions in a direction in which the both leg portions approach each other, with the fastener tape 15 having the core thread portion 15a sandwiched between both leg portions extending in a two-strand shape from the coupling head portion.

The lower stop 12 is generally manufactured by sequentially cutting a long metal wire having an X-shaped or H-shaped cross section in a longitudinal direction thereof to a desired thickness. As shown in fig. 4, first, the left and right fastener tapes 15 having the core portions 15a are inserted between the arm portions 12b extending from the body portion 12a to the left and right in 1 set, respectively, of the lower stop 12 having the X-shaped or H-shaped cross section. Then, the lower stop 12 is attached so as to straddle the left and right fastener tapes 15 by performing a bending process of plastically deforming the arm portions 12b of each group in a direction in which they approach each other with the fastener tapes 15 sandwiched between the arm portions 12b of each group.

The upper stop 13 is generally manufactured by cutting a long metal wire having a cross section in a u shape in the longitudinal direction thereof in a desired thickness, or cutting a flat metal wire in the longitudinal direction thereof in a desired thickness, and bending the obtained cut piece into a u shape. The upper stop 13 having the u-shaped cross section is attached to the fastener tape 15 by bending the upper stop 13 in a state where the fastener tape 15 is sandwiched between both end portions of the upper stop 13 and plastically deforming both end portions of the upper stop 13 in a direction of approaching each other.

The slider 14, the insert pin, and the socket are generally manufactured by die-casting using a mold having a predetermined cavity shape. For example, the slider 14 is molded by die casting to form a slider body and a pull tab. Further, the tab is attached to the slider body by bending a part of the slider body while the tab is held by the slider body. On the other hand, the insert pin and the receptacle are manufactured by die casting, and then are attached to the fastener tape by bending.

The fastener constituent member 1 of the present embodiment including the metal fastener element 11, the bottom stop 12, and the like as described above has the metal member body 2 and the metal plating film 3 disposed on the surface of the member body 2, and further, after the heat treatment for recrystallizing the crystal structure of the metal plating film 3 is performed on the fastener constituent member 1 as described below, the diffusion layer 4 is formed on the surface layer portion of the member body 2.

The material of the metal constituting the member body 2 is not particularly limited, but the slide fastener constituting member 1 of the present embodiment is a member constituting the slide fastener as described above, and is a member at least a part of which is bent, and therefore, it is preferable that the metal base material of the member body 2 is at least 1 metal selected from the group consisting of copper, a copper-zinc alloy, zinc, a zinc alloy, and an aluminum alloy.

In particular, when the metal base material of the component main body 2 is made of copper or a copper-zinc alloy, the component main body 2 has excellent ductility, and therefore can be bent relatively easily by caulking or the like. In this case, the ductility and corrosion resistance are improved as the proportion of the copper component contained in the component main body 2 (metal body) is increased, and therefore, the copper content in the component main body 2 is preferably 75 wt% or more. In addition, copper is widely used for electric wires and the like, and therefore copper wires of various wire diameters are easily obtained. Therefore, for example, when a large-sized slide fastener or the like is manufactured, the component main body 2 may be made of pure copper (the copper content is 100 wt%).

On the other hand, if the proportion of the zinc component contained in the member main body 2 (metal body) is high, the manufacturing cost can be reduced, but the corrosion resistance of the member main body 2 may be reduced, and stress corrosion cracking may occur. Therefore, the zinc content in the member main body 2 is preferably 25 wt% or less.

In addition, when the metal body (metal base material) of the member body 2 is made of zinc or a zinc-based alloy, it is inexpensive, and a large amount of complicated shapes such as a slider, a pin, a socket, and the like can be easily formed by die casting. On the other hand, zinc and zinc alloys have one side with poor corrosion resistance. Therefore, in the component main body 2, an undercoat film made of copper having excellent corrosion resistance is formed on the surface of a metal body made of zinc or a zinc-based alloy by electrolytic plating or the like.

Further, when the metal body (metal base material) of the component body 2 is made of an aluminum-based alloy (specifically, an aluminum-magnesium-based alloy or an aluminum-copper-silicon-based alloy), the weight of the fastener constituent component 1 can be easily reduced. On the other hand, aluminum-magnesium alloys and aluminum-copper-silicon alloys have a surface with poor corrosion resistance, and therefore need to be subjected to corrosion prevention treatment. Therefore, in the component main body 2, first, a first base plating film made of zinc is formed on the surface of a metal body made of an aluminum-based alloy by electroless plating or the like, and then a base plating film made of copper excellent in corrosion resistance is formed on the surface of the first base plating film by electrolytic plating or the like.

The member body 2 of the present embodiment has a diffusion layer 4 formed by diffusing the metal contained in the metal plating film 3 into the surface layer portion of the member body 2 when the metal plating film 3 is subjected to a heat treatment described later.

When the metal base material of the component main body 2 is made of, for example, copper or a copper-zinc alloy, the diffusion layer 4 is formed on the surface layer portion of the component main body 2 (metal body) made of copper or a copper-zinc alloy. In the case where the metal body of the member body 2 is made of, for example, zinc or a zinc-based alloy, the diffusion layer 4 is formed on the surface layer portion of the base plating film made of copper disposed on the surface of the metal body. Further, in the case where the metal body of the component main body 2 is made of, for example, an aluminum-based alloy, the diffusion layer 4 is formed on the surface layer portion of the second base plating film made of copper disposed on the outermost surface side of the component main body 2.

By forming such a diffusion layer 4 on the surface layer portion of the component main body 2, the metal plating film 3 can follow the component main body 2 well, and therefore, the adhesion of the metal plating film 3 to the component main body 2 can be improved. For example, when the member main body 2 is made of a copper-zinc alloy and the metal plating film 3 is made of a copper-zinc alloy, the diffusion layer 4 is not formed when the content of zinc contained in the member main body 2 is larger than that of the metal plating film 3.

In the fastener constituent member 1 according to the present embodiment, the metal plating film 3 is formed on the surface of the member body 2 as described above in order to impart a desired color tone to the fastener constituent member 1. As will be described later, the metal plating film 3 is first formed on the surface of the component main body 2 by a wet or dry plating treatment. At this time, the metal plating film 3 has a columnar crystal structure oriented to the (111) plane.

Further, after the metal plating film 3 having the columnar crystal structure is formed and before the fastener constituent member 1 is bent, the metal plating film 3 is subjected to a heat treatment for heating to a recrystallization temperature or higher. At least a part of the columnar crystal structure is recrystallized by the heat treatment, and the metal plating film 3 having a recrystallized structure in which crystal orientation is not visible (crystal orientation disorder) is formed.

Since at least a part of the plated metal film 3 has the above-described recrystallized structure, the plated metal film 3 is more flexible than the plated metal film 3 having only a columnar crystal structure, and the plated metal film 3 can be easily stretched.

In the present embodiment, as the material of the metal plating film 3, for example, copper (pure copper), a copper-zinc alloy, and a white metal (for example, a copper-tin alloy, a tin-nickel alloy, nickel, chromium, palladium, rhodium, platinum, or the like) can be used.

In this case, the fastener constituent member 1 may be deformed if the metal body made of the metal base material of the member main body 2 is softened at a heat treatment temperature at which the recrystallized structure can be formed in the metal plating film 3. Therefore, the metal plating film 3 is made of a material capable of forming a recrystallized structure at a temperature lower than the temperature at which the metal base material of the component main body 2 is softened. For example, considering the color tone suitable for the fastener constituent member 1, the recrystallization temperature range of the metal plating film 3, and the like, the metal plating film 3 is preferably made of at least 1 alloy selected from the group consisting of copper-zinc alloys, copper-tin alloys, and tin-nickel alloys.

In particular, when the metal base material of the member body 2 is made of copper or a copper-zinc alloy, the metal plating film 3 formed on the surface of the member body 2 is preferably made of a copper-zinc alloy (particularly, brass having a zinc content of 20 wt% or more) capable of imparting a classic style of color tone, or a copper-tin alloy or a tin-nickel alloy having a white color tone, for example.

When the metal base material of the member body 2 is made of zinc, a zinc-based alloy, or an aluminum-based alloy, the metal plating film 3 formed on the surface of the member body 2 is preferably made of, for example, a copper-zinc-based alloy (particularly, brass having a zinc content of 20 wt% or more) that can provide a classic style of color tone.

The metal plating film 3 having a recrystallized structure of the present embodiment has a film thickness of 1 μm or more and 10 μm or less, preferably 2 μm or more and 6 μm or less. By setting the thickness of the metal plating film 3 to 1 μm or more (preferably 2 μm or more), the metal plating film 3 can be formed stably and reliably.

On the other hand, the thicker the metal plating film 3 is formed, the more stable the formation of the metal plating film 3 can be made, but even if the film thickness of the metal plating film 3 is set to be larger than 10 μm, the film thickness of the metal plating film 3 is set to be 10 μm or less (preferably 6 μm or less, more preferably 3 μm or less) because the effect of improving the stability of the metal plating film 3 and the appearance quality obtained by the metal plating film 3 is not so large.

Further, the metal plating film 3 having a recrystallized structure of the present embodiment has a vickers hardness of Hv50 or more and Hv100 or less. If the vickers hardness of the metal plating film 3 is equal to or higher than Hv50, it is possible to prevent the surface of the slide fastener constituent member 1 from being damaged, and the like, and to maintain good appearance quality. On the other hand, if the vickers hardness of the metal plating film 3 is Hv100 or less, the ductility of the metal plating film 3 can be efficiently improved.

Next, a method of manufacturing the fastener constituent member 1 of the present embodiment having the above-described configuration will be described with reference to fig. 6.

First, the component main body 2 having a predetermined shape is manufactured. For example, when the fastener constituent member 1 is the metal fastener element 11 as described above, the member body 2 (including the member body 2 before formation of the base plating film) of the metal fastener element 11 is manufactured by cutting an elongated metal wire having a Y-shaped cross section in the longitudinal direction thereof in sequence by a predetermined thickness to form an element blank having a Y-shaped front view, and forming the coupling head portion or the like by press-forming the element blank, or by press-forming a flat plate material made of metal such as copper, a copper alloy or the like having a predetermined thickness to form the coupling head portion or the like and punching the flat plate material.

When the fastener constituent member 1 is the bottom stop 12, the member body 2 of the bottom stop 12 is produced by sequentially cutting a long wire having an X-shaped or H-shaped cross section in the longitudinal direction thereof at a desired thickness. In the case where the fastener component 1 is the upper stop 13, the component body 2 of the upper stop 13 is produced by cutting a long metal wire having a u-shaped cross section in the longitudinal direction thereof in a predetermined thickness or cutting a flat metal wire in the longitudinal direction thereof in a predetermined thickness, and bending the obtained cut piece into a u-shaped shape.

Further, when the fastener constituent member 1 is a box pin, or a slider 14, the member body 2 is manufactured by die casting using, for example, a mold having a predetermined cavity shape.

In the present invention, the method and means for producing the member body 2 are not particularly limited, and may be arbitrarily changed depending on the material, shape, and the like of the fastener constituent member 1.

In this case, for example, in the case where the metal body of the member main body 2 is made of zinc or a zinc-based alloy, an underlying plating film made of copper is formed on the surface of the metal body by electrolytic plating in order to improve the corrosion resistance of the member main body 2. For example, in the case where the metal body of the member main body 2 is made of an aluminum alloy (for example, an aluminum-magnesium alloy or an aluminum-copper-silicon alloy), in order to improve the corrosion resistance of the member main body 2, a first base plating film made of zinc is formed on the surface of the metal body by electroless plating, and a second base plating film made of copper is formed on the surface of the first base plating film by electrolytic plating.

Next, after the component body 2 of the slide fastener constituent member 1 is produced as described above, the obtained component body 2 is subjected to plating treatment to form the metal plating film 3 having a columnar crystal structure on the surface of the component body 2. At this time, the metal plating film 3 formed on the surface of the member body 2 is crystallized and grown in a columnar shape. The material of the metal plating film 3 formed on the surface of the member main body 2 is not particularly limited, but is preferably made of a copper-zinc alloy, a copper-tin alloy, or a tin-nickel alloy as described above.

In the present embodiment, the method for forming the metal plating film 3 is not particularly limited, and any plating treatment, wet or dry, may be used. For example, electrolytic plating, melt plating, and the like can be used as wet plating, and PVD method, CVD method, and the like can be used as dry plating.

In the case of forming the metal plating film 3 having a columnar crystal structure, the metal plating film 3 is formed such that the film thickness of the metal plating film 3 is set to 1 μm or more and 10 μm or less, preferably 2 μm or more and 6 μm or less. The vickers hardness of the surface of the metal plating film 3 formed in this way varies depending on the material of the metal plating film 3, but basically has a magnitude of Hv120 or more.

Next, the slide fastener constituent member 1 on which the metal plating film 3 has been formed after the plating treatment as described above is subjected to a heat treatment (recrystallization treatment) for heating the metal plating film 3 to a recrystallization temperature or higher. In this case, for example, when the metal plating film 3 of the fastener constituent member 1 is made of a copper-zinc alloy, the heat treatment is performed in a non-oxidizing atmosphere at a temperature in the range of from 300 ℃ to 400 ℃ for a predetermined time.

By performing the heat treatment in the non-oxidizing atmosphere in this way, the metal plating film 3 can be prevented from being oxidized during the heat treatment. In this case, as the non-oxidizing atmosphere, a nitrogen atmosphere, an argon atmosphere, a carbon monoxide atmosphere, a vacuum atmosphere, or the like can be used. Further, by performing the heat treatment in the temperature range of 300 ℃ to 400 ℃, a recrystallized structure in which the columnar crystal structure is recrystallized can be easily and stably formed in at least a part of the metal plating film 3 made of the copper-zinc alloy, and the softening of the member main body 2 can be prevented.

For example, when the metal plating film 3 is made of a copper-tin alloy, the heat treatment is performed in a pressurized non-oxidizing atmosphere at a temperature range of 400 ℃ to 500 ℃ for a predetermined time. On the other hand, when the metal plating film 3 is made of a tin-nickel alloy, the heat treatment is performed in a pressurized non-oxidizing atmosphere at a temperature range of 500 ℃ to 600 ℃ for a predetermined time.

In this way, by performing the heat treatment in a non-oxidizing atmosphere pressurized to, for example, 0.1MPa or more (preferably 0.5MPa or more), it is possible to prevent the tin contained in the plated metal film 3 from evaporating during the heat treatment and to prevent the plated metal film 3 from oxidizing. In this case, as the non-oxidizing atmosphere, a nitrogen atmosphere, an argon atmosphere, a carbon monoxide atmosphere, or the like can be used. In addition, by performing the heat treatment in a predetermined temperature range, a recrystallized structure can be easily and stably formed in at least a part of the metal plating film 3.

By performing the above-described heat treatment (recrystallization treatment) to form a recrystallized structure in which the columnar crystal structure is recrystallized in at least a part of the metal plating film 3, the vickers hardness of the surface of the metal plating film 3 can be reduced to Hv50 or more and Hv100 or less, and the ductility of the metal plating film 3 can be improved. By performing this heat treatment, the metal contained in the metal plating film 3 diffuses into the surface layer portion of the member body 2 to form the diffusion layer 4. Thus, the above-described slide fastener constituent member 1 of the present embodiment can be obtained.

The metal plating film 3 is made of a material capable of forming a recrystallized structure at a temperature lower than the temperature at which the metal base material of the component main body 2 is softened, as described above. Therefore, even if the zipper component 1 is subjected to the heat treatment for recrystallizing the columnar crystal structure of the metal plating film 3, the component body 2 is less likely to be softened, and the strength of the component body 2 is not reduced.

After the heat treatment (recrystallization treatment) is completed, for example, when the metal plating film 3 is made of a copper-zinc alloy, the copper contained in the metal plating film 3 can be oxidized to further perform a blackening treatment (blackening) for imparting a black color to the metal plating film 3. Specifically, the slide fastener constituent member 1 having the metal plating film 3 is immersed in a strongly alkaline solution containing sodium hydroxide and sodium chlorite, whereby a copper oxide coating film is formed on the surface of the metal plating film 3.

In the present invention, the conditions for the blackening treatment of the plated metal film 3 can be arbitrarily selected depending on the composition of the alloy constituting the plated metal film 3, and the like. Further, a means for blackening the metal plating film 3 is not particularly limited. Further, in the present invention, the metal plating film 3 made of a copper-zinc alloy is not limited to being blackened, and the metal plating film 3 may be colored in green or blue by changing the color tone of the metal plating film 3 by, for example, a copper sulfate method or a thiosulfate method.

Thereafter, the fastener constituent member 1 with the blackened surface of the metal plating film 3 can be subjected to polishing treatment. For example, the fastener constituent member 1 subjected to the blackening treatment and an abrasive (such as a grindstone) are put together into a tumbling mill and subjected to a polishing treatment. This enables the surface of the fastener component 1 to be finished in a classic style of old brass by peeling off a part of the oxidized film that has been blackened. In the polishing process, a polishing method such as shot blasting may be used instead of barrel polishing depending on the shape of the fastener constituent member 1.

On the other hand, after the heat treatment, for example, when the metal plating film 3 is made of a copper-tin alloy or a tin-nickel alloy, the metal plating film 3 has a white tone. Therefore, the metal plating film 3 can be subjected to polishing such as barrel polishing or shot blasting without being subjected to blackening treatment as described above.

After the polishing treatment is completed, the obtained slide fastener constituent member 1 is washed with water and dried. Thereafter, the surface of the fastener constituent member 1 may be subjected to a coating treatment of transparent colorless coating for surface protection, discoloration prevention, and corrosion prevention of the fastener constituent member 1.

The fastener constituent member 1 manufactured through the above-described processing steps is then subjected to bending such as caulking, and is used in a slide fastener. In this case, the metal plating film 3 disposed on the fastener constituent member 1 has a recrystallized structure as described above, and is excellent in ductility. Therefore, even if the fastener constituent member 1 is subjected to the bending process, the metal plating film 3 can be easily extended so as to follow the deformation of the fastener constituent member 1 caused by the bending process.

Thus, even if the material 1 is bent, the metal plating film 3 is less likely to be generated, and further, cracks or cracks are not generated. In particular, even when the fastener constituent member 1 has a large size and the amount of deformation of the fastener constituent member 1 during bending is large, for example, the bending can be smoothly performed without causing cracks or fissures in the metal plating film 3.

Therefore, it is possible to easily solve the conventional problems caused by the cracks or the cracks of the metal plating film, such as the problem that the appearance of the fastener constituent member is deteriorated due to the base material being exposed from the cracks or the cracks of the metal plating film, and the problem that the base material of the fastener constituent member is easily corroded.

Example 1

The present invention will be described in more detail with reference to the following examples.

As example 1, a case where the bottom end stop 12 as shown in fig. 3 to 5 is manufactured as a slide fastener component will be described. The lower stopper 12 of example 1 has a component body portion made of pure copper and a metal plating film disposed on the surface of the component body portion. In this case, the metal plating film is made of an alloy of copper and zinc having a copper content of 65 wt% and a zinc content of 35 wt%.

In order to manufacture the bottom stop 12 of example 1, first, a long pure copper wire having a circular cross section is cold-rolled so that the cross section of the pure copper wire is deformed into a substantially H-shape. Next, a pure copper wire having an H-shaped cross section is cut in a desired thickness in the longitudinal direction thereof, thereby producing a component body of the lower stop 12. Then, the obtained component main body is subjected to barreling treatment to remove burrs formed on the component main body.

Next, the component body of the manufactured bottom end stop 12 is subjected to plating treatment by electrolytic plating under predetermined conditions, whereby a metal plating film of a copper-zinc alloy is formed on the surface of the component body. Next, after the formation of the metal plating film, the cross section of the metal plating film was observed by a Transmission Electron Microscope (TEM). As a result, it was confirmed that: the crystals of the formed metal plating film were grown in a columnar shape, and the thickness of the metal plating film was 5.2 μm.

Further, as a result of analyzing the formed metal plating film by X-ray diffraction (XRD), it was confirmed that the metal plating film was strongly oriented to the (111) plane. Further, the results of analyzing the metal plating film by EPMA were also confirmed to be: regions having different concentration ratios of copper to zinc are formed in layers on the metal plating film. Further, as a result of measuring the vickers hardness of the metal plating film, the metal plating film had a vickers hardness of Hv 160.

Next, the lower stopper 12 having the metal plating film of the copper-zinc alloy formed on the surface of the member body made of copper is subjected to a heat treatment (recrystallization treatment). In this heat treatment, the bottom stop 12 was heated at 380 ℃ for 1 hour in a vacuum. After the heat treatment is completed, the cross section of the metal plating film of the lower stopper 12 is observed by a Transmission Electron Microscope (TEM). As a result, it was confirmed that: the columnar crystal structure observed in the heat treatment disappears, and the columnar crystal structure is recrystallized to form a recrystallized structure.

In addition, in TEM observation, it was confirmed; the thickness of the metal plating film was increased from 5.2 μm to about 8.0. mu.m. Therefore, as a result of analyzing the metal plating film by EPMA, it was confirmed that: the metal plating film is formed in a portion having a thicker film thickness, and a diffusion layer in which zinc contained in the metal plating film diffuses into copper in the member body is formed. According to the result, the judgment is that: since the diffusion layer is formed on the surface layer portion of the member body, the thickness of the metal plating film can be increased in TEM observation.

Further, as a result of analyzing the metal plating film after the heat treatment by X-ray diffraction (XRD), the orientation to the (111) plane was lost, and the crystal orientation was not observed. From this result, it was also confirmed that: the metal plating film has a recrystallized structure in which the columnar crystal structure is recrystallized. Further, as a result of measuring vickers hardness of the metal plating film after the heat treatment, it was confirmed that: the metal plating film has a Vickers hardness of Hv80, and the Vickers hardness of the metal plating film is reduced by heat treatment.

Next, the lower stopper 12 after the heat treatment is immersed in a strongly alkaline solution containing sodium hydroxide and sodium chlorite, thereby performing a blackening treatment for imparting a black color to the metal plating film. Thereafter, the lower stopper 12 subjected to the blackening treatment is subjected to a grinding treatment by a roller mill, whereby the color tone of the lower stopper 12 is finished to a classic-style old brass color, and then the lower stopper 12 is subjected to a colorless coating treatment.

After the colorless coating treatment is completed, the obtained lower stop 12 is subjected to bending processing, and the lower stop 12 is attached to the fastener tape 15 (see fig. 4 and 5). Then, the surface of the bottom stop 12 attached to the fastener tape 15 was visually observed, and as a result, no cracks or fissures were observed in the metal plating film of the bottom stop 12, and the bottom stop 12 had good appearance quality that uniformly exhibited a classic style of color tone.

On the other hand, in order to confirm the effect of the bottom stop of example 1, the bottom stop (comparative example) was produced under the same conditions as in example 1 and was attached to the fastener tape by caulking the bottom stop, except that the heat treatment was not performed after the metal plating film was formed. Further, the surface of the bottom end stop according to the comparative example attached to the fastener tape was visually observed, and as a result, the metal plating film of the bottom end stop was significantly cracked or cracked. Further, the lower stopper is exposed from the base metal of the base through cracks or fissures formed in the metal plating film, and the appearance (appearance quality) is deteriorated.

Example 2

As example 2, a case where the metal fastener element 11 is manufactured as a fastener component will be described.

The metal fastener element 11 of embodiment 2 has: a component main body portion made of an alloy (brass) of copper and zinc; and a metal plating film disposed on the surface of the member body. In this case, the alloy constituting the main body of the member contains 85 wt% of copper and 15 wt% of zinc. The metal plating film is made of an alloy of copper and tin, the copper content of which is 70 wt% and the tin content of which is 30 wt%.

In order to manufacture the metal fastener element 11 of example 2, a flat plate material made of brass having a predetermined thickness is press-formed to form a coupling head portion or the like, and the flat plate material is die-cut to manufacture a component body portion of the metal fastener element 11. Thereafter, the obtained component main body is subjected to barreling treatment to remove burrs formed on the component main body.

Next, the component body of the manufactured metal fastener element 11 is subjected to plating treatment by electrolytic plating under predetermined conditions, and a metal plating film of a copper-tin alloy is formed on the surface of the component body. Thereafter, the metal fastener element 11 on which the metal plating film is formed is subjected to a heat treatment (recrystallization treatment). In this heat treatment, the metal fastener element 11 was heated at 430 ℃ for 1 hour in an argon atmosphere pressurized to 0.6 MPa.

Next, the heat-treated metal fastener element 11 is subjected to a colorless coating treatment. Thereafter, the colorless coated metal fastener element 11 is subjected to caulking processing, and the metal fastener element 11 is attached to the fastener tape 15. Further, the surface of the metal fastener element 11 attached to the fastener tape 15 was visually observed, and as a result, it was confirmed that no crack or crack occurred in the metal plating film.

Example 3

As example 3, a case where the receptacle is manufactured as a slide fastener component will be described.

The socket of embodiment 3 has: a component body portion in which a zinc alloy is used as a metal base material; and a metal plating film disposed on the surface of the member body. In this case, the component main body includes: a metal body made of a zinc-based alloy; and a copper base plating film formed on the surface of the metal body. The metal plating film is made of an alloy of copper and zinc, the copper content of which is 65 wt% and the zinc content of which is 35 wt%.

To manufacture the socket of example 3, first, a metal body for a socket having a predetermined shape is formed by die-casting zinc. Next, the obtained metal body is subjected to electrolytic plating under predetermined conditions to form a base plating film of copper on the surface of the metal body, thereby producing a component main body of the socket.

Next, the component body of the manufactured socket was subjected to plating treatment by electrolytic plating under predetermined conditions, and a metal plating film of a copper-zinc alloy was formed on the surface of the component body. Thereafter, the socket formed with the metal plating film is subjected to a heat treatment (recrystallization treatment). In this heat treatment, the socket was heated at 320 ℃ for 1 hour in a pressurized atmosphere of 0.6 MPa.

Next, the socket after the heat treatment is immersed in a strongly alkaline solution containing sodium hydroxide and sodium chlorite, thereby performing a blackening treatment for imparting a black color to the metal plating film. Further, the sockets subjected to the blackening treatment were subjected to a polishing treatment by a roller mill to finish the color tone of the bottom end stop to an old brass color, and then the sockets were subjected to a colorless coating treatment.

Thereafter, the socket subjected to the colorless coating is subjected to caulking processing to mount the socket on the socket. Next, the surface of the receptacle mounted on the fastener tape was observed with the naked eye, and as a result, it was confirmed that: the socket has uniform color tone and no crack or crack in the metal plating film.

Example 4

As example 4, a case where a slider body for the slider 14 is manufactured as a slide fastener component will be described. The slider body according to example 4 has a member body portion made of an aluminum-copper-silicon alloy as a metal base material, and a metal plating film disposed on a surface of the member body portion.

In this case, the component main body includes: a metal body made of an aluminum-copper-silicon alloy; a first base plating film of zinc formed on the surface of the metal body; and a second base plating film of copper formed on a surface of the first base plating film. The metal plating film is made of an alloy of copper and zinc, the copper content of which is 65 wt% and the zinc content of which is 35 wt%.

To manufacture the slider body of example 4, first, a metal body having a predetermined shape is formed by die-casting an aluminum-copper-silicon alloy. Next, the obtained metal body is subjected to electroless plating under predetermined conditions to form a first base plating film of zinc on the surface of the metal body, and further subjected to electrolytic plating under predetermined conditions to form a second base plating film of copper on the surface of the first base plating film, thereby producing a component body of the slider body.

Next, the component body of the manufactured slider body is subjected to plating treatment by electrolytic plating under predetermined conditions, and a metal plating film of a copper-zinc alloy is formed on the surface of the component body. Thereafter, the slider body on which the metal plating film is formed is subjected to a heat treatment (recrystallization treatment). In this heat treatment, the puller body was heated at 330 ℃ for 1 hour in vacuum.

Next, the slider body after the heat treatment is immersed in a strongly alkaline solution containing sodium hydroxide and sodium chlorite, thereby performing a blackening treatment for imparting a black color to the metal plating film. Further, the slider body subjected to the blackening treatment is subjected to a grinding treatment by a roller mill to finish the color tone of the bottom end stop to an old brass color, and then the slider body is subjected to a colorless coating treatment.

Thereafter, the tab is attached to the slider body by hooking the tab to the tab attaching portion of the slider body which has been applied with the colorless coating, and further bending the tab attaching portion. Next, the surface of the slider body to which the tab is attached by bending was visually observed, and as a result, it was confirmed that: the slider body has a uniform color tone as a whole, and no cracks or fissures occur in the metal plating film.

Description of the reference numerals

1 slide fastener constituent member

2 parts main body

3 metallic plating film

4 diffusion layer

10 zipper

11 Metal zipper teeth

12 lower stop

12a main body part

12b arm part

13 top stop code

14 slider

15 zipper tape

15a core rope portion

Claims (7)

1. A slide fastener component (1) for a slide fastener, comprising a metal plating film (3) formed on the surface of a metal component body (2), and a bending process for bending at least a part of the component body (2) after the metal plating film (3) is formed,

the component main body (2) is made of copper or a copper-zinc alloy,

the metal plating film (3) is made of a copper-zinc alloy having a higher zinc content than the component main body (2),

the metal plating film (3) has a recrystallized structure in which at least a part of the crystal structure is recrystallized by performing a heat treatment before the bending,

the surface layer part of the component main body part (2) on the metal plating film (3) side is provided with a diffusion layer (4) formed by diffusing zinc contained in the metal plating film (3) through the heat treatment.

2. The fastener constituent element according to claim 1,

the recrystallized structure is formed by forming the metal plating film (3) in a columnar crystal structure on the surface of the member body (2), and then subjecting the metal plating film (3) to the heat treatment to recrystallize at least a part of the columnar crystal structure.

3. The fastener constituent element according to claim 1,

the component main body part (2) contains at least 75 wt% to 100 wt% of copper and 0 wt% to 25 wt% of zinc.

4. The fastener constituent element according to claim 1,

the metal plating film (3) having the recrystallization structure has a film thickness of 1 μm or more and 10 μm or less.

5. The fastener constituent element according to claim 1,

the metal plating film (3) having the recrystallized structure has a Vickers hardness of Hv50 or more and Hv100 or less.

6. The fastener constituent element according to claim 1,

the zipper component (1) is at least 1 selected from the group of zipper teeth (11), stop codes (12, 13), a separable bottom end stop and a slider (14).

7. A zipper, which is characterized in that,

the slide fastener constituent member according to any one of claims 1 to 6 is used by bending the slide fastener constituent member.