JP6058162B2 - Method for forming metal parts - Google Patents

Description

  The present invention relates to a method for forming a metal part, and more particularly, to a method for forming a metal part used for a button, a button fastener, a slide fastener, or the like having a decoration based on a difference in material color, gloss, or the like.

  Buttons, button fasteners, slide fasteners, and the like are attached to clothing, bags, etc., and greatly affect their design and fashionability. Therefore, the design of characters, figures, symbols, etc. attached to the surface of buttons and the like is very important for the appearance of clothing and the like. As one form for decorating metal parts used for buttons, button fasteners, slide fasteners, and the like, there is known one that utilizes the difference in color between the inner material and the outer material. For example, in JP 2009-50430 A, a convex portion is provided on an inner material, an opening that matches the convex portion is provided on an outer material having a color different from that of the inner material, and the inner member and the outer member are overlapped, A technique for exposing the convex portion of the material from the opening of the outer material is disclosed. Japanese Patent Application Laid-Open No. 8-24008 describes that an inner material of a different color can be seen from a window provided in the outer material.

JP 2009-50430 A Japanese Patent Laid-Open No. 8-24008

  However, in the technique of Patent Document 1 described above, the more complicated the shape of the convex portion and the opening, the more difficult it is to match the shape of the convex portion and the opening, and a gap is formed between the convex portion and the opening, and the boundary is It looks black and unsightly. Alternatively, the plating solution may enter such a gap during plating. For this reason, it is impossible to express a design with a complicated shape, and it is impossible to create a ring-shaped design. This is because, when a ring-shaped opening is made in the outer member, the outer member portion on the inner side in the radial direction of the ring-shaped opening is disengaged, resulting in a circular opening instead of a ring. In patent document 2, the surface to which the decoration is attached is not flat, and there is a problem that the opening portion and the non-opening portion are bumpy and unsightly.

  The present invention has been made in view of the above points, and an object of the present invention is to make the pattern and its periphery flat without touching the portion exposed as a pattern and the periphery of the pattern without any gaps. An object of the present invention is to provide a method for forming a metal part capable of providing a shape pattern or a ring-shaped pattern.

  In order to solve the above-mentioned problems, according to the present invention, there is provided a method for forming a metal component, wherein the laminate plate forms a laminated plate by laminating at least two layers. Step A including at least a first layer made of a first metal material and a second layer made of a second metal material having an outer surface to be defined, and a protrusion that is convex on the outer surface side of the laminate. A method is provided that includes a step B of forming a curved portion or a curved portion, and a step C of shaving a portion of the first layer corresponding to the protruding portion or the curved portion to partially expose the second layer on the surface. .

  In the present invention, the metal part is a metal part used for buttons, button fasteners, slide fasteners, and the like, and includes a plate-like part that can be seen by the user when attached to clothing, bags, and the like. Specific examples of the metal parts include a cap assembled to the head of a button or button stopper, a slider column of a slide fastener, a puller, and the like, but are not limited thereto.

  In the present invention, at least two layers of a first layer made of the first metal material and a second layer made of the second metal material are laminated to form a laminate (step A). The surface of the first layer opposite to the second layer (outer surface) substantially defines the surface of the metal part. As the first metal material and the second metal material, materials different in color, gloss, etc., such as different materials, are selected. However, if the colors, gloss, etc. are slightly different, almost the same kind of material may be used. Next, a protruding portion or a curved portion that is convex on the outer surface side is formed on the laminate (step B). Thus, the protrusion part or curved part which becomes convex on the outer surface side becomes concave on the surface opposite to the outer surface of the laminate. This processing can be performed when the laminated plate is formed into the shape of a metal part. Next, the portion of the first layer corresponding to the protruding portion or the curved portion is shaved from the outer surface side by polishing or the like to partially expose the second layer (step C). In Step C, a part of the second layer can also be shaved as the part of the first layer corresponding to the protrusion or the curved part is shaved. Since the second layer made of the second metal material is different in color, gloss, and the like from the first layer made of the first metal material, the second layer is formed on the surface of the metal part substantially defined by the outer surface of the first layer. Appears partially, and thereby, the decoration of different colors or the like can be given to the surface of the metal part. The portion of the second layer that is exposed on the surface of the metal plate can have various designs such as characters, figures, symbols, etc., depending on the form of the protrusions and the curved portions. Hereinafter, in the specification of the present application, the portion of the second layer that is partially exposed on the surface of the metal part is also referred to as a “pattern”. By scraping the first layer and exposing the second layer as a pattern, no gap is formed between the pattern of the second layer and the periphery of the pattern of the first layer. The pattern appears on the surface of the first layer of the laminate (the surface opposite to the second layer).

  In an embodiment of the present invention, the portion of the second layer corresponding to the protrusion before cutting in the step C has a concave shape that is recessed from the back surface side of the metal part to the first layer side. When forming the protrusions on the laminated board in the step B, by forming both the first layer and the second layer so as to be convex from the back side of the metal part to the surface (outer side of the first layer) side The portion of the second layer corresponding to the protrusion is recessed from the inner surface to the first layer side. Note that when the protruding portion is formed on the laminated plate, if the portion of the second layer corresponding to the protruding portion protrudes slightly toward the first layer side from the outer surface of the first layer, the second layer corresponding to the protruding portion is formed. When the second layer is partially exposed by shaving a portion of one layer from the outer surface side, the second layer can be exposed without being concavely shaved, and the second layer can be shaved flush with the outer surface. Can also be exposed.

  In one Embodiment of this invention, the process D which shape | molds the said laminated board in the shape of the said metal component is included. By this molding, two or more layers are integrated without using an adhesive or the like, but can be laminated using an adhesive or the like.

  In one embodiment of the present invention, the step A is to form at least two belt-like layers to form the belt-like laminated plate, and the step D is performed from the belt-like laminated plate to the metal part. A step of cutting a portion corresponding to. In this case, at the same time as cutting the portion corresponding to the metal part from the strip-shaped laminate, the cut laminate is formed into the shape of the metal part.

  In one embodiment of the present invention, the laminate includes a third layer made of a third metal material laminated on the opposite side of the second layer to the first layer, and in the step B, Forming a separate second protrusion, and in step C, the first layer and the second layer corresponding to the second protrusion are shaved from the outer surface side, and the third layer is formed on the surface. To expose. In the present embodiment, a laminate is formed by laminating at least three layers of a first layer made of a first metal material, a second layer made of a second metal material, and a third layer made of a third metal material (step A). ). As the third metal material, a material different in color, gloss, etc. from the first and second metal materials is selected. If the color, gloss, etc. are slightly different, the material may be almost the same as the first or second metal material. Next, in step B, in addition to the above-described protrusion or curved portion for partially exposing the second layer on the surface of the metal component, the third layer for partially exposing the surface of the metal component. A second protrusion is formed. Next, the first layer and the second layer corresponding to the second protrusion are shaved from the outer surface side by polishing or the like to partially expose the third layer (step C). In Step C, a part of the third layer can be removed as the first layer and the second layer corresponding to the second protrusion are removed. The third layer made of the third metal material is different from the first and second layers made of the first and second metal materials in color, gloss, and the like, so that the outer surface of the first layer substantially defines the metal. Apart from the pattern of the second layer, a third layer appears partially on the surface of the part. Hereinafter, in the specification of the present application, the portion of the third layer that is partially exposed on the surface of the metal part is also referred to as a “second pattern”.

  In an embodiment of the present invention, the portion of the third layer corresponding to the second protrusion before cutting in the step C has a concave shape that is recessed from the back surface side of the metal part to the first layer side. When forming protrusions on the laminate in step B, the first layer, the second layer, and the third layer are all convex from the back side of the metal part to the front surface (outside surface of the first layer). By molding, the portion of the third layer corresponding to the protrusion is also recessed from the inner surface to the first layer side. When the second protrusion is formed on the laminated plate, if the third layer portion corresponding to the protrusion protrudes slightly toward the first layer from the outer surface of the first layer, it corresponds to the protrusion. When the portions of the first layer and the second layer to be cut are cut from the outer surface side to partially expose the third layer, the third layer can be exposed without cutting into a concave shape, and is flush with the outer surface. The third layer can be exposed by shaving.

  In one embodiment of the present invention, the first metal material is copper or a copper alloy, and the second metal material is aluminum or an aluminum alloy. In this case, in step C, the first layer of copper or copper alloy corresponding to the protrusion or curved portion is scraped, and the second layer of aluminum or aluminum alloy is partially exposed.

  In one embodiment of the present invention, the metal part is a cap, and the cap includes a disc-shaped bottom portion, and a peripheral side portion extending from the radially outer end of the bottom portion to the opposite side to the protruding direction of the protruding portion. It has. This cap is also called a shell cap, and is attached to the button stopper body or the button body as a component of the button stopper or button.

  In one embodiment of the present invention, the bottom is convex spherical in the direction in which the protrusion protrudes. If the bottom of the cap is a flat disc that runs along a horizontal plane perpendicular to the axis of the cap, for example, when the caps are subjected to surface treatment such as plating or when they are transported, the bottoms of the two caps are in close contact with each other Then, a situation that can not be separated can occur. Such a situation can be avoided by making the bottom of the cap a convex spherical shape that is slightly convex toward the outer surface.

  In one embodiment of the present invention, in the step B, the protruding portion and the peripheral side portion are formed. In this case, in step B, the laminate is formed into a cap shape, and a protrusion is formed at the bottom of the cap.

  According to another aspect of the present invention, there is provided a method for forming a metal component, wherein the laminated plate is formed as a step A of forming a laminated plate in which at least two layers are laminated. Step A including at least one layer and an inner second layer made of a second metal material, and the laminate are concave from the outer surface side of the first layer and convex to the inner surface side of the second layer Step B for forming the hollow portion and the first layer in the inner hollow portion, which is a portion of the second layer corresponding to the hollow portion, are partially left, and the first layer is formed at least in the region around the hollow portion. There is provided a method for forming a metal part, which includes a step C of exposing the second layer together with the first layer remaining in the inner depression.

  In the present invention, at least two layers of a first layer made of the first metal material and a second layer made of the second metal material are laminated to form a laminate (step A). As the first metal material and the second metal material, materials different in color, gloss, etc., such as different materials, are selected. However, if the colors, gloss, etc. are slightly different, almost the same kind of material may be used. Next, a depression is formed in the laminated plate that is concave from the outer surface side of the first layer and convex from the inner surface side of the second layer (step B). This processing can be performed when the laminated plate is formed into the shape of a metal part. Next, the first layer that has entered the inner depression, which is a portion of the second layer corresponding to the depression, is partially left, and at least the first layer in the area around the depression is shaved by polishing or the like. The second layer and a part of the first layer remaining in the inner depression are exposed (step C). Since the first layer made of the first metal material partially remaining in the inner depression and the second layer made of the second metal material surrounding the first layer are different in color, gloss, etc., the first layer is shaved and exposed. The first layer in the inner depression part appears partially on the surface of the metal part that is at least partially defined by the second layer to be formed, and thereby the decoration of different colors or the like can be given to the surface of the metal part. The first layer in the inner depression exposed on the surface of the metal plate can have various designs such as characters, figures, symbols, etc., depending on the shape of the depression. Hereinafter, in the specification of the present application, the first layer in the inner depression portion that is partially exposed on the surface of the metal part is also referred to as “pattern”. By scraping the first layer and exposing a part of the first layer remaining in the inner depression as a pattern, no gap is formed between the pattern of the first layer and the pattern periphery of the second layer. The pattern appears on the outer surface of the second layer, which is exposed when the first layer is shaved.

  In one embodiment of the present invention, the first metal material is copper or a copper alloy, and the second metal material is aluminum or an aluminum alloy. In this case, in Step C, the copper or copper alloy of the first layer is shaved at least in the region around the recess, and the second layer aluminum or aluminum alloy and the inner recess corresponding to the second layer of the recess The entering first layer of copper or copper alloy is exposed. And the copper or copper alloy which remains in an inner side hollow part becomes a pattern surrounded by aluminum or aluminum alloy.

  In one embodiment of the present invention, the metal component is a cap, and the cap includes a disk-shaped bottom portion and a peripheral side portion extending in a direction in which the hollow portion is recessed from a radially outer end of the bottom portion. Become. This cap is also called a shell cap, and is attached to the button stopper body or the button body as a component of the button stopper or button.

  In one embodiment of the present invention, the bottom has a convex spherical shape on the side opposite to the direction in which the recess is recessed. If the bottom of the cap is a flat disc that runs along a horizontal plane perpendicular to the axis of the cap, for example, when the caps are subjected to surface treatment such as plating or when they are transported, the bottoms of the two caps are in close contact with each other Then, a situation that can not be separated can occur. Such a situation can be avoided by making the bottom of the cap a convex spherical shape that is slightly convex toward the outer surface.

  In one embodiment of the present invention, in the step C, the first layer at the bottom of the cap is scraped, leaving the first layer at the peripheral side. In this case, at the bottom of the cap, the first layer is removed except for the first layer remaining in the inner depression, and at the peripheral side of the cap, the first layer remains on the second layer. Therefore, the copper or copper alloy as the first layer remains on the aluminum or aluminum alloy as the second layer in the peripheral side portion of the cap. When the cap is attached to the button fastener main body or the like, the peripheral side portion of the cap is curved by a die. At this time, if the peripheral side portion is made of only aluminum or an aluminum alloy, if the die is removed after the peripheral side portion is bent by the die, a spring back in which the peripheral side portion is slightly restored tends to occur. In this regard, in this embodiment, since copper or copper alloy is present on the aluminum or aluminum alloy in the peripheral side portion, the spring back hardly occurs and the cap can be easily and reliably attached.

  In one embodiment of the present invention, the height along the axial direction of the peripheral side portion extending from the bottom portion is smaller than the radius of the bottom portion. In this way, by setting the height of the peripheral side part to be less than the radius of the bottom part, when polishing many caps that have finished the process B and molding with a polishing medium such as a polishing stone in the process C (bulk polishing), The first layer at the bottom of the cap is removed by polishing, while the first layer at the peripheral side of the cap remains without being removed. Therefore, it is possible to easily perform the step of leaving the first layer on the peripheral side portion while scraping the first layer on the bottom portion of the cap.

  In the present invention, the second layer is partially exposed as a pattern on the surface of the metal part by scraping the portion of the first layer corresponding to the protruding portion or the curved portion of the laminated plate, and thereby, on the surface of the metal component. Decoration can be given. Since the second layer is exposed by scraping the first layer, there is no gap between the pattern of the second layer and the periphery of the pattern of the first layer, and the boundary between the two does not appear black. Further, by cutting the protrusion or the curved portion flush with the outer surface of the first layer, the pattern and the periphery thereof can be finished flat on the surface of the metal part. Furthermore, by making the protrusions and the like have a relatively complicated shape or ring shape, it is possible to give a complicated shape or ring shape pattern that has been difficult with the technique disclosed in Japanese Patent Application Laid-Open No. 2009-50430. .

  In another aspect of the present invention, the first layer remaining in the inner dent portion and the second layer surrounding the first layer are exposed to the region by cutting the first layer in at least the region around the dent portion in the laminate. And the first layer in the inner depression can be represented as a pattern. Since the first layer is scraped to expose the second layer and the first layer remaining in the inner depression, no gap is formed between the pattern of the first layer and the pattern periphery of the second layer. The border does not look black. In addition, by making the hollow part into a relatively complicated shape or ring shape, it is possible to give a complicated shape or ring shape pattern that was difficult with the technique disclosed in Japanese Patent Application Laid-Open No. 2009-50430.

FIG. 1 is a cross-sectional view showing an example of a button fastener having a cap which is an example of a metal part formed by the method according to the present invention. FIG. 2 is a bottom view of the button stopper, showing the surface of the button stopper. FIG. 3 is a cross-sectional view of the fastener body. FIG. 4 is a bottom view of the fastener body. FIG. 5 is an explanatory diagram showing a process of laminating the outer layer and the inner layer. FIG. 6 is a cross-sectional view of the cap after forming and forming the protrusion. FIG. 7 is an explanatory cross-sectional view showing a state immediately before forming a protrusion on the laminated plate portion by the inner die and the outer die. FIG. 8 is a cross-sectional explanatory view showing a state in which a protruding portion is formed on the laminated plate portion by the inner die and the outer die. FIG. 9 is a partially enlarged view of FIG. FIG. 10 is a partial cross-sectional view of the cap showing a state in which the protrusion is cut away. FIG. 11 is a cross-sectional view showing a state in which the female snap button is fixed to the fabric with a button stopper. FIG. 12 is a partial cross-sectional view showing another example of the cap of the button fastener. FIG. 13 is a bottom view of the cap of FIG. FIG. 14 is an explanatory view showing an example in which the present invention is applied to a column portion of a slider of a slide fastener. FIG. 15 is a cross-sectional view of the column portion of FIG. FIG. 16 is a perspective view showing a puller of a slide fastener which is another example of the metal part to which the present invention is applied. 17 is a cross-sectional view taken along line AA in FIG. FIG. 18 is a cross-sectional view showing a state before the protrusion is cut. FIG. 19 is a cross-sectional view showing a cap which is an example of a metal part formed by the method according to the present invention. 20 is a plan view of the cap of FIG. FIG. 21 is a cross-sectional view showing an intermediate cap serving as a cap. FIG. 22 is a cross-sectional view showing a state immediately before forming a recess in the laminate using the outer die and the inner die. FIG. 23 is a cross-sectional view of when a recess is formed in a laminated board using an outer die and an inner die. FIG. 24 is an enlarged view showing a state in which a part of the outer layer remains in the inner depression. FIG. 25 is an enlarged view showing a state in which the outer layer remains on the inner layer in the peripheral side portion of the cap. FIG. 26 is a cross-sectional view illustrating a state in which a cap is attached to the stopper main body to form a button stopper. FIG. 27 is an enlarged view showing a curved state of the peripheral side portion of the cap. FIG. 28 is a cross-sectional view showing a state in which the female snap button is attached to the fabric using the button stopper. FIG. 29 is a plan view showing a state in which the cap surface is plated or anodized.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to these embodiments, and modifications and the like can be made within the scope of the claims and the equivalent scope thereof. Will be understood by those skilled in the art. FIG. 1 is a cross-sectional view showing an example of a button fastener (hereinafter, also simply referred to as “fastener”) 10 having a cap 20 which is an example of a metal part formed by the method according to the present invention. The stopper 10 includes a substantially disc-shaped head portion 11 and a cylindrical shaft portion 12 extending concentrically with the head portion 11 from above the head portion 11 (upper and lower sides are based on the paper surface of FIG. 1). As shown in FIG. 11, the stopper 10 is for attaching a female snap button 30, which is an example of a button, to the fabric 1 by crimping the shaft portion 12 after passing through the fabric 1. The female snap button 30 includes a protrusion receiving space 31 that receives a protrusion of the male snap button (not shown). Reference numeral 32 is a ring spring for engaging with the engaging portion of the male snap button, and reference numeral 33 is an opening for passing the shaft portion 12 of the stopper 10. The stopper 10 is composed of only two parts, a stopper main body 13 and a cap 20. The stopper main body 13 is formed by drawing a metal plate material, and forms a shaft portion 12 and a base core 14 that is an upper surface side portion of the head portion 11. A pattern 23 is added to the lower surface (outer surface) 22a of the head portion 11 of the cap 20 as will be described in detail later. The outer periphery 21 of the cap 20 is caulked upward in a C shape, and the cap 20 is locked to the radially outer end of the upper surface of the base core 14 of the fastener body 13. Thereby, the cap 20 is attached to the base core 14 so as to cover the lower surface thereof from below, and forms a lower surface side portion of the head 11. In this state, the lower surface 22a of the cap 20 becomes the surface of the fastener 10, and hence the lower surface 22a of the cap 20 is also referred to as the surface 22a of the fastener 10. Also, the opposite surface is called the back surface. Before the outer peripheral portion 21 is crimped, the cap 20 has a disk-shaped bottom portion 22 and a peripheral side portion (that is, an outer peripheral portion) 21 that extends upward from the radially outer end of the bottom portion 22. It is a cup shape having. FIG. 2 is a bottom view of the button stopper 10, and shows a surface 22 a of the stopper 10, that is, a lower surface 22 a of the cap 20. A letter “I” is added to the surface 22a as a pattern 23 by a method according to the present invention described later. This pattern 23 shows a simple example for convenience of explanation, and a more complicated and finely designed pattern can be attached.

  3 and 4 are a cross-sectional view and a bottom view of the fastener body 13. The base core 14 of the fastener main body 13 has three home base-shaped openings 15 at equal intervals in the circumferential direction. Each opening 15 is arranged such that its home-base-shaped mountain-shaped top 15a faces outward in the radial direction, and the home-base-shaped bottom 15b facing the mountain-shaped top 15a faces the center in the radial direction. Each opening 15 is formed by cutting the base core 14 into a home base shape excluding the bottom 15b, and then bending the cut portion 15c to the lower surface side of the base core 14 by 180 degrees. As a result, the three incised portions 15 c substantially block the lower opening of the shaft portion 12 of the fastener main body 13. Further, the base core 14 of the fastener body 13 includes a radially inner portion 14a, a radially outer portion 14b slightly below the radially inner portion 14a, and a space between the radially inner and radially outer portions 14a and 14b. And a connecting portion 14c for connecting the two. The incision 15c bent from the opening 15 is slightly above the lowermost end of the radially outer portion 14b. Moreover, the mountain-shaped top part 15a of each opening 15 exists in the range of the radial direction outer part 14b, and the base 15b exists in the range of the radial direction inner part 14a.

  The cap 20 includes an outer layer 20A as a first layer that defines the lower surface (outer surface) 22a of the cap 20, and an inner layer 20B as a second layer that defines the upper surface 22b of the cap. The inner layer 20B faces the base core 14 of the fastener body 13, and the outer layer 20A is laminated over the entire lower surface of the inner layer 20B. In the present embodiment, the outer layer 20A is made of copper or a copper alloy which is an example of a first metal material, and the inner layer 20B is made of aluminum or an aluminum alloy which is an example of a second metal material. The thickness of the outer layer 20A is 0.15 mm as an example, and the thickness of the inner layer 20B is 0.2 mm as an example. Thus, preferably the thickness of the outer layer 20A is thinner than the thickness of the inner layer 20B. Therefore, the thickness of the cap 20 is 0.35 mm, and this thickness is substantially the same as the thickness of a conventional cap made of only copper or a copper alloy. Therefore, the cap 20 can reduce the amount of copper or copper alloy used, which is more expensive than aluminum or aluminum alloy, compared to the conventional cap.

Next, a method for forming the above-described cap 20 of the button fastener 10 will be described as an embodiment of a method for forming a metal part according to the present invention.
Lamination process In forming the cap 20, first, the outer layer 20A as the first layer and the inner layer 20B as the second layer are laminated. FIG. 5 shows a process of superimposing the band-shaped first material 23A that becomes the outer layer 20A of the cap 20 and the band-shaped second material 23B that becomes the inner layer 20B. The first material 23A is made of copper or a copper alloy, and the second material 23B is made of aluminum or an aluminum alloy. The first and second materials 23A and 23B are respectively unwound from a supply roll (not shown) and then passed between the pair of pressure rollers 25a and 25b to be stacked on each other. Hereinafter, the first and second materials 23A and 23B after lamination are referred to as “laminate plate 24”. As will be described later, after the first and second materials 23A and 23B are laminated, the laminated plate portion 24a corresponding to each cap 20 is cut from the laminated plate 24 and formed into a circular cup shape. Is formed with a protrusion 23 to be described later. By such molding, the outer layer 20A and the inner layer 20B are integrated without using an adhesive or the like therebetween. However, it can also be laminated using an adhesive or the like between the outer layer 20A and the inner layer 20B.
Cutting / Molding Step Next, the belt-like laminated plate 24 laminated between the pressure rollers 25a and 25b is passed between the lower die 26 and the upper die 27 shown in FIG. 5 arranged downstream of the pressure rollers 25a and 25b. Is done. Here, from the laminated plate 24, the laminated plate portion 24a corresponding to each cap 20 (see FIG. 7), that is, the laminated plate portion 24a having a dimension in which the cup-shaped cap 20 is expanded horizontally is cut off and cut almost simultaneously. The laminated plate portion 24a is formed into a cup shape. Thereby, the cap 20 which has the bottom part 22 and the peripheral side part (outer peripheral part) 21 shown in FIG. 6 is obtained. As will be described below, the protrusion 23a is formed almost simultaneously with the molding of the cap 20. The cap 20 is a single component in which an outer layer 20A and an inner layer 20B are laminated.

Projection Forming Step The upper die 27 (see FIG. 5) includes an inner die 27 a having an I-shaped convex portion 28 corresponding to the pattern 23 shown in FIG. 7, and the lower die 26 has a shape corresponding to the pattern 23. An outer die 26a having a recess 29 is included. The convex portion 28 of the inner die 27 a is slightly smaller than the pattern 23, and the concave portion 29 of the outer die 26 a is slightly larger than the pattern 23. Almost simultaneously with the molding process described above, the cap 23 has a protrusion 28 that protrudes downward in a shape corresponding to the letter “I” that is the pattern 23 by the protrusion 28 of the inner die 27 a and the recess 29 of the outer die 26 a. 23a is formed. That is, as shown in FIGS. 7 and 8, the convex portion 28 of the inner die 27a is pressed against the circular laminated plate portion 24a separated from the laminated plate 24 from the upper surface 22b which is the surface on the inner layer 20B side, and the outer side The outer die 26a is applied from the lower surface 22a which is the surface on the layer 20A side so that the convex portion 28 of the inner die 27a is received by the concave portion 29 of the outer die 26a. Thereby, the convex protrusion part 23a of the shape corresponding to the pattern 23 which is depressed from the upper surface 22b of the cap 20 and protrudes downward from the lower surface 22a is formed. The protrusion 23a is formed in a convex shape on the surface side (also referred to as the outer surface side) of the cap 23 as a metal part. The portion 20B of the second layer corresponding to the protrusion 23a has a concave shape that is recessed from the back surface side of the metal part to the first layer side. The laminated plate portion 24a is formed into the shape of the cap 20 almost simultaneously with the processing of the protruding portion 23a. 7 and 8, a die for forming the peripheral side portion 21 of the cap 20 is omitted. The protrusion 23 a has a shape slightly larger than the letter “I” which is the pattern 23. Further, in FIGS. 7 and 8, for convenience of description, the laminated plate portion 24a is shown to be formed with the projections 23a and formed into the cap 20. However, actually, the laminated plate portion 24a is laminated to the laminated plate portion 24a. Almost simultaneously with the cutting, the projection 23a is formed and the cap 20 is formed. FIG. 9 is an enlarged cross-sectional view of the protrusion 23a. The protruding portion 23a includes an outer protruding portion 23A that is a portion of the outer layer 20A corresponding to the protruding portion 23a, and an inner protruding portion 23B that is a portion of the inner layer 20B corresponding to the protruding portion 23a. As can be seen from FIG. 9, the lower surface 23Ba of the inner protrusion 23B is the lower surface (outer surface) 22a of the cap 20 and protrudes slightly below the periphery of the protrusion 23a.

Next, the protrusion 23a of the cap 20 is ground by polishing or the like from the lower surface 22a side, and the portion corresponding to the protrusion 23a on the lower surface 22a of the cap 20 is flush with the lower surface 22a as shown in FIG. . As a result, the outer protrusion 23A is removed, and the inner protrusion 23B is partially exposed on the lower surface 22a, which becomes the pattern 23, that is, the letter “I”. The lower surface 22a of the cap 20 is expressed as a two-color design using two different materials from the aluminum or aluminum alloy of the inner layer 20B forming the pattern 23 and the copper or copper alloy of the outer layer 20A forming the periphery of the pattern 23. The In addition, on the lower surface 22a of the cap 20, the aluminum or aluminum alloy of the pattern 23 and the surrounding copper or copper alloy are in contact with each other without any gap, and the boundary between the two hardly becomes black. In addition, since there is no gap between the pattern 23 and the periphery thereof, the plating solution does not enter during the plating process. Furthermore, the part from which the protrusion 23a is removed is flush with the lower surface 22a of the cap 20, and the lower surface 22a with the pattern 23 is flat. Therefore, the surface 22a of the button stopper 10 to which the cap 20 is assembled has a clean impression and appearance. In the above example, the projecting portion 23a is shaved until it is flush with the lower surface 22a. However, as long as at least a part of the inner projecting portion 23B is visible from the lower surface 22a side of the cap 20, the lower surface 22a Even if it is not cut to the same level, some protruding portions may remain. In the above description, the protruding portion forming step is performed almost simultaneously with the cutting / forming step, but the protruding portion 23a may be formed before or after the cutting / forming step.

  As described above, the cap 20, which is an example of a metal part, is formed from two layers of the outer layer 20 </ b> A and the inner layer 20 </ b> B, and the lower surface 22 a of the cap 20, that is, the surface 22 a of the stopper 10 is expressed by the pattern 23 and the surrounding two colors. However, the present invention is not limited to this example. For example, it is possible to design the surface with three or more colors by using three or more metal parts. FIG. 12 is a cutaway sectional view showing a cap 40 which is another example of a cap for a button fastener. The cap 40 has a bottom portion 42 and a peripheral side portion 41, and is assembled to the fastener main body 13 (see FIG. 1) similarly to the cap 20. The cap 40 includes an outer layer 40A as a first layer that defines a lower surface (outer surface) 42a of the cap 40, an intermediate layer 40B as a second layer stacked over the entire upper surface of the outer layer 40A, and an intermediate layer 40B. It is formed of a laminated plate that is laminated on the entire upper surface and laminated with an inner layer 40C as a third layer that defines the upper surface 42b of the cap 40. In the present embodiment, the first metal material that is the outer layer 40A is made of copper or a copper alloy, the second metal material that is the intermediate layer 40B is made of aluminum or an aluminum alloy, and the third metal material that is the inner layer 40C is nickel. Or it consists of a nickel alloy. FIG. 13 shows a pattern 43 attached to the lower surface 42 a of the cap 40. The pattern 43 includes a square outer frame 43c that is a first pattern, and a vertical rectangle 43d as a second pattern that is centrally located inside the outer frame 43c. An intermediate region 43e between the outer frame 43c and the vertical rectangle 43d is a part of the lower surface 42a of the cap 40. The outer frame 43c exposes the aluminum or aluminum alloy of the intermediate layer 40B, and the vertical rectangle 43d exposes the nickel or nickel alloy of the inner layer 40C. The lower surface 42a of the cap 40 including the intermediate region 43e is copper or a copper alloy of the outer layer 40A.

  The cap 40 is formed as follows similarly to the cap 20. First, a laminated plate (not shown) is cut and molded, and a first protrusion 43a and a second protrusion 43b that protrude downward are partially shown in FIG. 12 by an inner die and an outer die (not shown). To do. The first protrusion 43a and the second protrusion 43b are separate. In addition, the 1st and 2nd protrusion parts 43a and 43b can also be formed before or after a cutting and shaping | molding process. The 1st projection part 43a is for forming the outer frame 43c of the pattern 43, and has enclosed the 2nd projection part 43b in square shape. The first protrusion 43a includes a first outer protrusion 43A that is a portion of the outer layer 40A corresponding to the first protrusion 43a and a first intermediate protrusion that is a portion of the intermediate layer 40B corresponding to the first protrusion 43a. 43B and a first inner protrusion 43C which is a portion of the inner layer 40C corresponding to the first protrusion 43a. The second protrusion 43b is for forming a vertical rectangle 43d of the pattern 43, and protrudes greatly downward from the first protrusion 43a. The second protrusion 43b includes a second outer protrusion 43A2 that is a portion of the outer layer 40A corresponding to the second protrusion 43b and a second intermediate protrusion that is a portion of the intermediate layer 40B corresponding to the second protrusion 43b. 43B2 and a second inner protrusion 43C2 that is a portion of the inner layer 40C corresponding to the second protrusion 43b. Referring to FIG. 12, the lower surface of the first intermediate protrusion 43B of the first protrusion 43a protrudes slightly below the lower surface 42a of the cap 40, but the lower surface of the first inner protrusion 43C is the lower surface 42a. Is above. On the other hand, in the second protrusion 43b, not only the lower surface of the second intermediate protrusion 43B2 is below the lower surface 42a of the cap 40, but also the lower surface of the second inner protrusion 43C2 protrudes slightly below the lower surface 42a. Yes. The first protrusion 43a and the second protrusion 43b are ground by polishing or the like so as to be flush with the lower surface 42a of the cap 40. Thereby, in the 1st projection part 43a, 43 A of 1st outer side projection parts are shaved, and the aluminum or aluminum alloy of 1st intermediate | middle projection part 43B is partially exposed, and this appears as the outer frame 43c of the pattern 43. FIG. In the second protrusion 43b, the second outer protrusion 43A2 and the second intermediate protrusion 43B2 are scraped. As a result, the nickel or nickel alloy of the second inner protrusion 43C2 is partially exposed, and some aluminum or aluminum alloy of the second inner protrusion 43C2 remains so as to surround the nickel or nickel alloy. Appears as a vertical rectangle 43d. The lower surface 42a of the cap 40 including the intermediate region 43e is made of copper or a copper alloy. Therefore, as shown in FIG. 13, the lower surface 42a of the cap 40 has a three-color design due to the two-color pattern 43 of the outer frame 43c and the vertical rectangle 43d and the ground color of the lower surface 42a including the intermediate region 43e. appear.

  In the above, the cap of the button fastener is given as an example of the metal part, but the present invention is not limited to this, and is a part such as a button attached to clothing, groceries, a slide fastener, Any device including a plate-like portion visible to the user can be applied. Further, in the above example, the protrusions are cut into a pattern, but the curved portion can be cut into a pattern as described below. FIG. 14 shows a column portion 60 that holds a puller 54 in a slider 53 of a slide fastener 50 as another example of a metal component to which the present invention is applied. The slide fastener 50 includes left and right fastener tapes 51a and 51b and left and right fastener elements 52a and 52b attached to opposite ends of the fastener tapes 51a and 51b. The slider 53 includes a rectangular parallelepiped case-like column part 60 having an opening on one side on which the puller 54 is held. The slider 53 opens and closes between the left and right fastener elements 52a and 52b. Moved. The column portion 60 is formed in a case shape from left and right side plate portions 62 (only one side plate portion 62 is shown in FIG. 15) and a pair of back plate portions 61 that connect the left and right side plate portions 62. The back plate portion 61 includes two curved portions 64 and 65 (upper and lower sides in FIG. 15). The curved portions 64 and 65 are curved so as to be convex on the front surface 61a side (also referred to as the outer surface side) of the column portion 60 and concave on the back surface 61b side. The side plate portions 62 are provided with notches 62a, and the puller 54 is connected through the notches 62a. Two circular patterns 63a and a horizontal rectangular pattern 63b along the corner of the curved portion 65 on the lower side (left side in FIG. 15) are applied to the surface 61a of the column part 60.

  The column portion 60 is formed in substantially the same manner as the cap 20 of the button stopper 10 described above. That is, an outer layer 60A as a first layer made of copper or a copper alloy and an inner layer 60B as a second layer made of aluminum or an aluminum alloy are laminated to form a laminated plate. Next, a portion corresponding to the column portion 60 is cut from the laminated plate and formed into the shape of the column portion 60. By this molding, a back plate portion 61 including upper and lower curved portions 64 and 65 and left and right side plate portions 62 are formed on the column portion 60. During this molding, two protrusions (not shown) corresponding to the two circular patterns 63a are formed. These protrusions are formed so as to be recessed from the back surface 61b of the column part 60 and project from the front surface 61a. Next, the portion of the outer layer 60 </ b> A corresponding to the protruding portion of the column portion 60 and the portion of the outer layer 60 </ b> A corresponding to the lower curved portion 65 are scraped by polishing or the like. Thereby, the portion of the second layer 60B corresponding to each protrusion appears on the surface 61a as a pattern 63a, and appears as the portion of the second layer 60B corresponding to the lower curved portion 65. In the present embodiment, the pattern 63 b is formed only on the lower curved portion 65, but may be provided on the upper curved portion 64.

  FIG. 16 shows an example in which an ellipse pattern 73 is provided on a pull handle 70 for a slide fastener. The puller 70 corresponds to the puller 54 of the slide fastener 50 described above, and can be applied to the slide fastener 50 instead of the puller 54. In that case, the connecting portion 71 a of the puller 70 is connected to the notches 62 a of the left and right side plate portions 62 of the column portion 60 of the slider 53. The user pulls the puller 70 from the knob 71b on the opposite side of the connecting part 71a of the puller 70. The knob portion 71b is provided with a trapezoidal opening 71c. 17 is a cross-sectional view taken along the line AA of FIG. 16, and FIG. 18 is a cross-sectional view similar to FIG. 17 showing a state in which the protrusion 73a is formed on the pull handle 70. The puller 70 is formed by laminating an outer layer 70A as a first layer made of copper or a copper alloy and an inner layer 70B as a second layer made of aluminum or an aluminum alloy. Reference numeral 74 in FIG. 18 is a recess provided around the surface of the outer layer 70A in contact with the inner layer 70B, and reference numeral 75 is a protrusion provided around the surface of the inner layer 70B in contact with the outer layer 70A. It is. The first layer 70A and the second layer 70B are integrated by fitting the concave portion 74 and the convex portion 75 together. The protrusion 73a is formed so as to be recessed from the back surface 72b of the pull handle 70 and protrude from the front surface (outer surface of the outer layer 70A) 72a. The protrusion 73a includes an outer protrusion 73A corresponding to the outer layer 70A and an inner protrusion 73B corresponding to the inner layer 70B. The inner protrusion 73B protrudes slightly above the puller surface 72a. Next, by cutting the outer protrusion 73A, the inner protrusion 73B is exposed as a pattern 73 on the surface 72a.

  In the above, in the laminate of the outer layer and the inner layer, the outer layer and the inner layer are formed with protrusions that are convex outward, and the outer layer corresponding to the protrusions is shaved and the inner layer is partially exposed as a pattern. An example was given. Next, as another aspect of the present invention, in the laminate of the outer layer and the inner layer, a recess is formed in which the outer layer and the inner layer are concave from the outside to the inside, and the outer layer is partially formed in the recess. An example will be described in which the outer layer is removed while leaving, the outer surface of the inner layer is exposed, and a part of the outer layer remaining in the recess of the inner layer is represented as a pattern. FIG. 19 is a cross-sectional view showing a cap 80 which is an example of a metal part formed by the method according to the present invention. FIG. 20 is a plan view of the cap 80 as viewed from below in FIG. The cap 80 includes a disc-shaped bottom portion 81 and a peripheral side portion 82 that extends upward (upper and lower sides are based on the paper surface of FIGS. 19, 21, etc.) from the radially outer end of the bottom portion 81. The bottom portion 81 is not a flat disc along a horizontal plane perpendicular to the axis of the cap 80, but has a spherical shape that slightly protrudes downward (in a direction opposite to the direction in which the peripheral side portion 82 extends). Similarly, the bottom portions 22 and 42 of the caps 20 and 40 described above are not flat and have a slightly convex spherical shape. The height (length) of the peripheral side portion 82 of the cap 80 extending from the radially outer end of the bottom portion 81 along the axial direction (vertical direction) is set to be smaller than the radius of the bottom portion 81. In the present embodiment, the height of the peripheral side portion 82 is about half of the radius of the bottom portion 81. The cap 80 has an “I” -shaped pattern 83 (see FIG. 20) on the lower surface (surface or outer surface) 81 a of the bottom 81.

  FIG. 21 is a cross-sectional view showing an intermediate cap 80a that is a semi-finished product immediately before the cap 80 is formed. The intermediate cap 80 a has an intermediate bottom portion 81 a and an intermediate peripheral side portion 82 a that become the bottom portion 81 and the peripheral side portion 82. The intermediate cap 80a is a laminate in which the outer layer 80A as the first layer made of copper or a copper alloy and the inner layer 80B as the second layer made of aluminum or an aluminum alloy are laminated. Although it cut | disconnects substantially similarly and shape | molds in cup shape, it differs from the semi-finished product about the cap 20 by the point which forms the hollow part 84 mentioned later. FIG. 22 is a cross-sectional view showing a state immediately before forming the recessed portion 84 using the outer die 90 and the inner die 91 with respect to the laminated plate 80b cut to a size corresponding to each intermediate cap 80a. FIG. 23 is a cross-sectional view of the recess 84 formed by the outer die 90 and the inner die 91. When the laminated plate 80b is formed into a cup shape, the outer layer 80A and the outer layer 90A are formed by using the outer die 90 having an I-shaped convex portion 90a corresponding to the pattern 83 and the inner die 91 having an I-shaped concave portion 91a. A recess 84 is formed in which the inner layer 80B is recessed upward (inner side) (see FIG. 23). The recess 84 protrudes upward from the inner surface of the inner layer 80B. The convex portion 90 a of the outer die 90 is slightly smaller than the pattern 83, and the concave portion 91 a of the inner die 91 is slightly larger than the pattern 83. The depression 84 includes an outer depression 84a generated in the outer layer 80A and an inner depression 84b larger than the outer depression 84a generated in the inner layer 80B. The outer depression 84a is depressed from the outer surface of the outer layer 80A and enters the inner depression 84b. The depth recessed from the outer surface of the outer layer 80A of the outer recessed portion 84a is substantially the same level as the outer surface of the inner layer 80B that is not recessed around the inner recessed portion 84b. Further, the pressing surface 90b of the outer die 90 is slightly concave spherical, and the pressing surface 91b of the inner die 91 is slightly convex spherical. As a result, the intermediate bottom portion 81a of the intermediate cap 80a has a slightly convex spherical shape downward.

  Next, as an example, the outer layer 80A at the intermediate bottom portion 81a of the intermediate cap 80a is removed by bulk polishing a large number of intermediate caps 80a with a polishing stone. At this time, since the height of the peripheral side portion 82 of the cap 80 is set to be smaller than the radius of the bottom portion 81 as described above, the polishing stone touches the outer surface of the intermediate bottom portion 81a of the intermediate cap 80a. The outer peripheral surface of the intermediate peripheral side portion 82a is hardly touched. As a result, the outer layer 80A in the intermediate bottom portion 81a of the intermediate cap 80a is removed leaving a portion (pattern 83) that has entered the inner depression portion 84b, while the peripheral side portion 82 of the cap 80 is on the inner layer 80B. The outer layer 80A remains. In this way, the intermediate cap 80a becomes the cap 80 (see FIG. 19). FIG. 24 is an enlarged view showing a state in which a part of the outer layer 80A remains in the inner depression 84b. As a result, at the bottom 81 of the cap 80, the outer surface of the inner layer 80B is exposed, and a part of the outer layer 80A remaining in the inner depression 84b appears as a pattern 83. The outer layer 80A of the peripheral side portion 82 remains so as to gradually become thinner near the bottom portion 81 as shown in FIG. This is because the polishing stone slightly scrapes the outer layer 80A near the bottom 81 during bulk polishing.

  26 is a cross-sectional view showing a state in which the button stopper 100 is formed by attaching the cap 80 to the stopper main body 13 shown in FIG. The cap 80 is crimped to the base core 14 of the fastener main body 13 so that the peripheral side portion 82 is curved upward in a C shape, as described above for the cap 20. The curved state of the peripheral side portion 82 is shown enlarged in FIG. At the time of this caulking, since the outer side layer 80B made of copper or copper alloy remains on the inner side layer 80B made of aluminum or aluminum alloy, the circumferential side portion 82 is made of only aluminum or aluminum alloy. Compared to the case, when the die (not shown) for bending the peripheral side portion 82 is removed, a spring back in which the curved portion is slightly restored is less likely to occur, and the base core 14 is formed by bending the peripheral side portion 82. Can be easily and reliably attached. In addition, since the outer side layers 20A and 40A made of copper or copper alloy are present on the inner side layer 20B made of aluminum or aluminum alloy and the outer side layers 20A and 40A made of copper or copper alloy also on the peripheral side portions 21 and 41 of the caps 20 and 40, Even when the peripheral side portions 21 and 41 are bent and attached to the base core 14 of the fastener main body 13, the spring back hardly occurs and can be easily and reliably crimped. FIG. 28 is a cross-sectional view showing a state in which the female snap button 30 shown in FIG. The outer surface of the cap 80 on which the pattern 83 is generated can be appropriately subjected to surface treatment such as plating or alumite. For example, FIG. 29 shows a state in which the surface 81a on which the pattern 83 of the cap 80 appears is plated. FIG.

  In the embodiment in which the outer layer 80A is scraped by leaving a part of the outer layer 80A remaining in the depression 84 as a pattern 83 as described above, the cap 80 is given as an example of a metal part. The present invention is not limited to the cap 80, and can also be applied to metal buttons, button fasteners, these components, slider pillars, and components for slide fasteners such as pullers. In the embodiment in which the recess 84 is formed, the example in which the cap 80 is formed from the laminated body 80b including the outer layer 80A and the inner layer 80B has been described. However, the embodiment in which the protrusion is formed is illustrated in FIG. In the same manner as described above, a metal part can be formed from a laminate of three or more layers.

10 Stopper for Button 13 Stopper Main Body 20, 40 Cap 20A, 40A Outer Layer (First Layer)
20B Inner layer (second layer)
21, 41 Circumferential side (outer peripheral part)
22, 42 Bottom 22a, 42a The lower surface of the cap (surface of button stopper)
22b Upper surface of the cap 23, 43 Pattern 23a Projection 23A Outer projection 23B, 63B Inner projection 24 Laminate 40A Outer layer (first layer)
40B Intermediate layer (second layer)
40C Inner layer (third layer)
43a First projection 43A First outer projection 43B First intermediate projection 43C First inner projection 43b Second projection 43A2 Second outer projection 43B2 Second intermediate projection 43C2 Second inner projection 43c Outer frame 43d Vertical rectangle (second pattern)
50 Slide fastener 53 Slider 60 Column 60A Outer layer (first layer)
60B Inner layer (second layer)
63B Inner protrusion 63a, 63b Pattern 65 Curved portion 70 Puller 70A Outer layer (first layer)
70B Inner layer (second layer)
73 Pattern 73a Projection 73A Outer Projection 73B Inner Projection 72a Surface (Outer Side)
80 cap 80A outer layer (first layer)
80B Inner layer (second layer)
80a Intermediate cap 81 Bottom portion 82 Circumferential side portion 83 Pattern 84 Depression portion 84a Outer depression portion 84b Inner depression portion

Claims (12)

A method of forming a metal part (20, 40 ) , comprising:
In Step A, in which at least two layers are laminated to form a laminated plate (24), the laminated plate (24) is made of a first metal material having an outer surface serving as a surface of the metal component (20, 40 ). first layer of the (20A, 40 a), a step a of the second layer and (20B, 40 B) comprises at least made of a second metallic material,
Wherein the laminate (24), a step B of forming a protrusion is convex to the outer side surface (23a, 43a, 43 b),
A step C of removing portions of the first layer (20A, 40A ) corresponding to the protrusions (23a, 43a, 43b ) to partially expose the second layer (20B, 40B ) on the surface; seen including,
The metal part is a cap (20, 40), and the cap (20, 40) is a disk-shaped bottom (22, 42) and the protrusion (23a) from the radially outer end of the bottom (22, 42). , 43a, 43b) and a peripheral side portion (21, 41) extending in the opposite direction to the projecting direction, and the first layer (20A, 40A) is formed on the peripheral side portion (21, 41). Define the radially outer surface,
The method includes a step D of forming the laminate (24) into the shape of the cap (20, 40),
In the step D, the first layer (20A, 40A) and the second layer (20B, 40B) are integrated with each other without using an adhesive . Said portion of the second layer (20B, 40 B) is concave recessed on the first layer side from the back side of the metal part corresponding to the protrusion before cutting in the step C (23a, 43a, 43 b ) The method of forming a metal part according to claim 1. In the step A, at least two belt-like layers (23A, 23B) are laminated to form the belt-like laminate (24),
The step D is a method of forming the metal part according to claim 1 or 2 comprising the step of cutting the portion (24a) which corresponds to the metal part (20, 4 0) from said strip of said laminate (24) . The laminate includes a third layer (40C) made of a third metal material laminated on the opposite side of the second layer (40B) from the first layer (40A),
Forming a second protrusion (43b) separate from the protrusion (43a) in the step B;
In the step C, the portions of the first layer (40A) and the second layer (40B) corresponding to the second protrusion (43b) are scraped to partially expose the third layer (40C) on the surface. The method for forming a metal part according to any one of claims 1 to 3 . Said portion of the third layer (40C) corresponding to the second protrusion before cutting in the step C (43 b) are to claim 4 is concave recessed from the back surface side of the metal component on the first layer side A method for forming a metal part as described.   The method for forming a metal part according to claim 1, wherein the first metal material is copper or a copper alloy, and the second metal material is aluminum or an aluminum alloy. The method of forming a metal part according to claim 1 , wherein the bottom (22, 42) has a convex spherical shape in a direction in which the protrusion (23a, 43a, 43b) protrudes. The method of forming a metal part according to claim 1 , wherein the step D is performed simultaneously with the step B. A method of forming a metal part (80) comprising:
In step A of forming a laminated plate (80b) in which at least two layers are laminated, the laminated plate (80b) includes an outer first layer (80A) made of the first metal material and an inner side made of the second metal material. Step A including at least the second layer (80B) of
Forming a recess (84) in the laminate (80b) that is concave from the outer surface side of the first layer (80A) and convex on the inner surface side of the second layer (80B);
The first layer (80A) in the inner depression (84b), which is the portion of the second layer (80B) corresponding to the depression (84), is partially left, and at least the area around the depression (84) the first layer and the second layer by cutting the (80A) (80B), seen including a step C of exposing with the first layer remaining in the inner recess portion (84b) (80A) at,
The metal part is a cap (80), and the cap (80) has a disk-shaped bottom (81) and a circumference extending in a direction in which the recess (84) is recessed from the radially outer end of the bottom (81). Side (82),
In the step C, a method of forming a metal part in which the first layer (80A) at the bottom (81) of the cap (80) is scraped and the first layer (80A) at the peripheral side (82) is left . The method for forming a metal part according to claim 9 , wherein the first metal material is copper or a copper alloy, and the second metal material is aluminum or an aluminum alloy. The method of forming a metal part according to claim 9 , wherein the bottom (81) has a convex spherical shape on the side opposite to the direction in which the recess (84) is recessed. The method for forming a metal part according to claim 9 , wherein a height along the axial direction of the peripheral side portion (82) extending from the bottom portion (81) is smaller than a radius of the bottom portion (81).

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