WO2016139788A1

WO2016139788A1 - Button fastener and button fastener manufacturing method

Info

Publication number: WO2016139788A1
Application number: PCT/JP2015/056421
Authority: WO
Inventors: 修久伊藤; 大山道
Original assignee: Ykk株式会社
Priority date: 2015-03-04
Filing date: 2015-03-04
Publication date: 2016-09-09
Also published as: JPWO2016139788A1; JP6463456B2; CN107205526B; CN107205526A

Abstract

Provided is a manufacturing method for a metal button fastener, the method enabling successful press processing of a base-end part of an intermediate member into a base part having an outer circumferential shape non-similar to that of the base-end part. A button fastener (10) is provided with a shank part (30), and a plate-shaped base part (20) which expands in the radial direction in the base-end side of the shank part (30). This method includes a step A in which a base-end part (41) of a columnar intermediate member (40), which becomes the button fastener (10), is made into the base part (20) by using a die to press process the base-end part and widen the same in the radial direction. The outer circumferential shape of the base-end part (41) and the outer circumferential shape of the base part (20) are non-similar. The die is provided with a holding die (50) for holding the intermediate member (40) so that the base-end part (41) is exposed, and a press die (60) for pressing the base-end part (41) against the holding die (50). The holding die (50) includes a molding surface (55b) for molding the upper surface (21) of the base part (20). The molding surface (55b) includes a plurality of recesses (56) or a plurality of protrusions (94). In the step A, the displacement of the material of the base-end part (41) in the radial direction is controlled by the recesses (56) or the plurality of protrusions (94).

Description

Button fastener and method of manufacturing button fastener

The present invention relates to a button fastener and a method of manufacturing the button fastener, and more specifically, has a plate-like base portion and a shank portion extending from the base portion. For example, the circular outer peripheral shape of the base portion is a corresponding portion of the intermediate member. The present invention relates to a metal button stopper formed by pressing from an outer peripheral shape such as a rectangle, and a method of manufacturing such a button stopper.

As a metal button stopper having a plate-like base and a shank extending from the base, a triangular intermediate member is cut out from the metal plate, and the triangle base side portion (base end) of the intermediate member is molded with a mold. There is known a button stopper in which the base portion is pressed and the remaining portion of the intermediate member is almost as it is the shank portion. A shell cap is generally attached to this button stopper so as to cover the surface of the base opposite to the surface on the shank portion side.

Generally, since the above-described button stopper is attached to an adherend such as a button or a bar material as a counterpart member, the tip of the shank portion needs to be pierced with a cloth and deformed using the shape of the counterpart member. In that case, it is preferable that the tip of the shank member is as thin and pointed as possible so that the shank portion can be easily pierced into the fabric. The intermediate member on which the button stopper is molded in order to obtain a shank portion having an acute tip shape is non-circular, for example, a polygonal shape such as a rectangle or a trapezoid, while the base end portion has a non-circular shape. The outer peripheral shape of the base is usually required to be circular. When an intermediate member with a polygonal outer peripheral shape is pressed, the shape of the intermediate member's base end is expanded as it is, for example, the outer peripheral shape of the base becomes a distorted oval shape, and a clean circular base Did not become. In this case, the centering of the shank portion and the base portion becomes difficult, and the work of fixing the button to the cloth or the like of the clothes using the button fastener or the work of assembling the shell cap to the button fastener may be hindered. Further, even if the shell cap can be attached to the base portion of the button stopper, there is a problem that the pressing to the base portion becomes insufficient, and the shell cap is later displaced or easily detached.

The present invention has been made in view of the above-described problems, and the purpose of the present invention is to successfully press the base portion having an outer peripheral shape that is not similar to the outer peripheral shape of the base end portion of the intermediate member. It is an object of the present invention to provide a metal button stopper manufacturing method that can be performed and a button stopper having such a base.

In order to solve the above-described problems, the present invention provides a metal button stopper including a shank portion and a plate-like base portion extending in a radial direction intersecting a direction in which the shank portion extends on a base end side of the shank portion. A method of manufacturing, which is a columnar intermediate member serving as the button stopper, and is a step A in which a base end portion of the intermediate member is pressed using a mold and is expanded in a radial direction to form the base portion. The outer peripheral shape of the base end portion of the intermediate member and the outer peripheral shape of the base portion of the button fastener include a step A, and the mold exposes the base end portion to expose the intermediate member. And a pressing die for pressing the base end portion of the intermediate member against the holding die, the holding die has a molding surface for molding the shank portion side surface of the base portion, The molding surface has a plurality of concave portions or convex portions, and the step A The button stop is characterized by controlling the material flow in the radial direction of the base end when the base end is plastically deformed to the base by the concave portion or the convex of the molding surface of the holding mold. A method of manufacturing the tool is provided.

In the present invention, the base of the button stopper spreads in a radial direction that intersects the direction in which the shank extends. The radial direction for the intermediate member is a direction that intersects the direction in which the intermediate member extends in a columnar shape, and corresponds to the direction in which the base of the button stopper spreads. The radial direction of the button fastener is synonymous with the radial direction orthogonal to the central axis of the shank when the shank has, for example, a conical shape having a central axis.

In the present invention, in step A, a metal button stopper having a plate-like base portion and a shank portion extending from the base portion is formed from a columnar intermediate member. At this time, the base end of the button member is formed by pressing the base end of the intermediate member with a die and expanding in the radial direction. The outer peripheral shape of the base end of the former intermediate member and the radial direction are formed. The outer peripheral shape of the base of the latter button stopper after being expanded to a non-similar shape. Examples of the outer shape extending from the former to the latter in a non-similar shape include, for example, rectangle → circular, rectangle → elliptical or oval, rectangle → diamond, cornered rectangle → rectangle with rounded corners. , Circular → elliptical or oval, circular → regular octagon, circular → positive direction, etc., but are not limited thereto.

In the present invention, a mold for pressing the base end portion of the intermediate member into the base portion of the button stopper (also referred to as forging) is a holding die that holds the intermediate member by exposing the base end portion of the intermediate member And a press die for pressing the proximal end portion of the intermediate member against the holding die. The holding mold has a molding surface for molding the surface of the base portion on the shank portion side. The molding surface has a plurality of concave portions or convex portions, and when the base end portion is plastically deformed while expanding in the radial direction to the base portion due to the concave portions or convex portions, the radial direction of the base end portion is increased. Controls the plastic flow rate of metal materials. In the present invention, by providing a plurality of recesses or projections on the molding surface of the holding mold, the flow amount of the metal material in the radial direction is controlled to be intentionally non-uniform, and thereby the base end of the intermediate member The part is successfully plastically deformed to the base of the button fastener having a non-similar outer peripheral shape. For example, when a groove that is an example of a concave portion is provided along a certain radial direction (for example, the plastic flow direction x in FIG. 11) on the molding surface of the holding mold, the material enters the groove during press working, and the one Therefore, the amount of material movement in the one radial direction is increased. As another example, when a convex portion is arranged in one radial direction with a molding surface, the convex portion serves as a resistance that hinders the movement of the material, and thus the amount of material movement in the one radial direction is reduced. By controlling the amount of material movement in this way, it becomes possible to finish the base part of the button fastener into a target outer peripheral shape that is arranged with minimal distortion. The plastic flow referred to in the present invention refers to the flow of metal when the metal is deformed by press working.

In the present invention, when the base end portion of the intermediate member plastically flows in the radial direction in the step A, the concave portion or the convex portion has one plastic flow direction (also referred to as one radial direction) and a material movement amount. The material flow is controlled so that different plastic flow directions are generated, and the outer peripheral shape of the base end portion of the intermediate member is different from the outer peripheral shape of the base portion. For example, on the molding surface of the holding mold, a groove that is an example of a plurality of recesses exists in one plastic flow direction in parallel to the one plastic flow direction, and such a groove is formed in another plastic flow direction. If not, the metal material enters the groove in the one plastic flow direction, and the material movement in the one plastic flow direction is promoted, so the amount of material movement compared to another plastic flow direction without the groove Will increase. As another example, a protrusion which is an example of a plurality of convex portions in one plastic flow direction is present on the molding surface so as to be orthogonal to the one plastic flow direction, and such a protrusion is formed in another plastic flow direction. When there is no stripe, the metal material hits the protrusion in the one plastic flow direction and the material movement is hindered, so the amount of material movement in the one plastic flow direction is less than that in another plastic flow direction without the protrusion. Become.

In one embodiment of the present invention, the molding surface of the holding mold has a plurality of grooves or protrusions extending linearly in a direction intersecting the radial direction as the plurality of recesses or projections. When a plurality of linear grooves intersect one radial direction on the molding surface of the holding mold, a part of the metal material enters the groove during pressing and intersects the one radial direction along the groove. The material moves away from the one radial direction and is dispersed. Therefore, it is considered that the amount of material movement in the one radial direction is reduced. In addition, when a plurality of linear ridges intersect one radial direction on the molding surface of the holding die, the ridges become a resistance to the plastic flow of the metal material, and thus the amount of material movement in the one radial direction is reduced. .

In one embodiment of the present invention, the molding surface of the holding mold has a plurality of parallel grooves or protrusions extending along one direction as the plurality of concave portions or convex portions. In the case where a plurality of grooves are present in parallel on the forming surface of the holding mold, in the radial direction that is parallel to the grooves, the movement of the material is promoted while the material enters the grooves, and the material movement is increased. On the other hand, in the radial direction orthogonal to the groove, a part of the material enters the groove and deviates in the direction orthogonal to the radial direction. Therefore, it is considered that the material movement in the radial direction is reduced. When a plurality of protrusions exist in parallel on the molding surface of the holding mold, the material movement is hindered by the protrusions in the radial direction perpendicular to the protrusions, and the amount of material movement in the radial direction is reduced. In the radial direction parallel to the ridge, the material that moves in the radial direction is concentrated in the radial direction because the ridge restricts the material that deviates from the radial direction and the material moves intensively in the radial direction. It is thought that it will increase compared to.

In one embodiment of the present invention, the convex portion is a projection, and the molding surface of the holding mold includes a region where the projection is relatively dense and a region where the projection is relatively rough. In the area where the protrusions are relatively dense on the molding surface of the holding mold, the resistance to material flow when the base end of the intermediate member is plastically deformed to the base of the button stopper is greater than in the area where the protrusions are relatively rough. The amount of material movement in the radial direction is reduced.

In one embodiment of the present invention, the holding die includes a molding concave portion that matches the outer peripheral shape of the base to be molded, the molding surface is a bottom surface of the molding concave portion, and the concave portion or the convex portion is formed on the bottom surface of the molding concave portion. Is formed. Such a molding concave portion assists the molding to the target outer peripheral shape by controlling the material flow by the concave portion or the convex portion of the molding surface described above. That is, the molding concave portion plays a role of adjusting the outer peripheral shape achieved by the material flow control by the concave portion or the convex portion to an outer peripheral shape closer to the target. Even if there is a molding recess in the holding mold, if there is no material flow control, the material does not always fill the molding recess and form a beautiful target outer peripheral shape.

The present invention may include a step of cutting a substantially triangular portion from the plate material as the intermediate member. In this case, the intermediate member has a substantially triangular column shape, and the base end portion of the intermediate member is a portion on the bottom side of the triangle. The base end portion of the intermediate member obtained by cutting the plate material generally has a quadrangular outer peripheral shape. Most parts except the base end part of the intermediate member can be used as they are as the shank part of the button stopper. In a preferred embodiment of the present invention based on the drawings described later, a portion adjacent to the base end portion of the intermediate member is compression-molded between a first mold and a second mold that form a holding mold.

According to another aspect of the present invention, there is provided a metal button stopper including a shank portion and a plate-like base portion extending in a radial direction intersecting a direction in which the shank portion extends on a base end side of the shank portion. The base portion is formed by pressing the base end portion of the intermediate member serving as the button stopper with a die and expanding in the radial direction, and the outer peripheral shape of the shank portion and the outer peripheral shape of the base portion. And a button stopper having a plurality of convex portions or concave portions on the surface of the base portion on the shank portion side. The button fastener according to the present invention can be obtained by the above-described method according to the present invention, and a plurality of convex portions or concave portions present on the shank portion side surface of the base portion of the button fastener are a plurality of portions on the molding surface of the holding mold. Are formed by a concave portion or a convex portion.

In one embodiment of the present invention, the plurality of protrusions or recesses are a plurality of protrusions or grooves extending linearly in a direction intersecting the radial direction. In another embodiment of the present invention, the plurality of protrusions or recesses are a plurality of parallel protrusions or grooves extending along one direction.

In one embodiment of the present invention, the outer peripheral shape of the shank portion is a polygon, and the outer peripheral shape of the base portion is a circle. Polygons include, but are not limited to, triangles, squares, rectangles, trapezoids, rhombuses, pentagons, hexagons, octagons, and the like.

In one embodiment of the present invention, a shell cap is provided that is attached to the base so as to cover a surface of the base opposite to the surface on the shank portion side. Since the button stopper of the present invention has a plurality of convex portions or concave portions on the surface of the base portion on the shank portion side, these convex portions or concave portions become resistance and the shell cap is displaced or detached from the base portion. The situation can be reduced or eliminated.

In the manufacturing method of the button fastener according to the present invention, when the base end portion of the intermediate member is forged into the base portion of the button fastener, the plurality of concave portions or convex portions provided on the molding surface of the holding die are used to radially Control the amount of moving metal material to be intentionally non-uniform so that the base end of the intermediate member can be successfully plastically deformed to the base of a button fastener that has a non-similar outer shape. Can do.

In the button stopper according to the present invention, when the shell cap is attached to the base portion by the convex portion or the concave portion provided on the surface of the base portion on the shank portion side, the shell cap is easily displaced or detached from the base portion. Can be prevented.

FIG. 1 is a side view showing a button stopper according to an embodiment of the present invention. FIG. 2 is a top view of the button fastener of FIG. 3 is a cross-sectional view taken along the line AA in FIG. 4 is a cross-sectional view taken along the line BB of FIG. FIG. 5 is a perspective view of the intermediate member. FIG. 6 is a perspective view showing a metal plate material from which an intermediate member is cut out. FIG. 7 is a cross-sectional explanatory view showing the cutting process of the plate material. FIG. 8 is an explanatory cross-sectional view showing a state immediately before the press die is moved with respect to the intermediate member held by the holding die, and corresponds to the CC cross section of FIG. FIG. 9 is a bottom view of the holding mold in the open state. FIG. 10 is a bottom view showing a state where the holding-type intermediate member in the open state is arranged. FIG. 11 is a bottom view of the holding mold showing a closed state in which the intermediate member is held between the first mold and the second mold. FIG. 12 is an explanatory cross-sectional view showing a state where the base end portion of the intermediate member is pressed while moving the press die relative to the holding die. FIG. 13 is a partial cross-sectional side view showing the button stopper with the shell cap assembled thereto. 14 is a top view of the button fastener of FIG. FIG. 15A is a bottom view showing another example of the holding mold. FIG. 15B is a DD cross-sectional view of FIG. FIG. 16A is a bottom view showing still another example of the holding mold. FIG. 16B is a cross-sectional view taken along the line EE of FIG. FIG. 17 is a bottom view showing another example of the holding mold. FIG. 18 is a bottom view showing still another example of the holding mold. FIG. 19 is a bottom view showing a further example of a holding mold. FIG. 20 is a bottom view of the conical columnar intermediate member. FIG. 21 is a bottom view showing a holding mold for forming the proximal end portion of the intermediate member in FIG. 20. FIG. 22 is a bottom view showing another example of a holding die for forming the proximal end portion of the intermediate member in FIG. 20. FIG. 23 is a bottom view showing still another example of a holding die for forming the proximal end portion of the intermediate member in FIG. 20. FIG. 24 is a cross-sectional explanatory view showing a state in which the button is attached to the fabric with another button stopper according to the present invention. FIG. 25 is a cross-sectional explanatory view showing a state in which another button is attached to the fabric with still another button stopper according to the present invention.

Hereinafter, some embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to these embodiments, and those skilled in the art will appropriately modify the embodiments within the scope of the claims and the equivalents thereof. Understand that etc. can be made.

FIG. 1 is a side view showing a button stopper 10 according to an embodiment of the present invention. FIG. 2 is a top view of the button stopper 10. 3 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 4 is a cross-sectional view taken along the line BB in FIG. The button stopper 10 is a component formed as described later from a metal plate material (see FIG. 6) such as copper, brass, aluminum, stainless steel, or iron. The button stopper 10 includes a plate-like base 20 and a shank portion 30 extending upward from the base 20 (the vertical direction of the button stopper 10 is based on the paper surface of FIG. 1 unless otherwise specified). Is provided. The base 20 extends in a radial direction orthogonal to the vertical direction in which the shank portion 30 extends. In this embodiment, the base 20 has an outer peripheral shape close to a perfect circle (hereinafter also referred to as “outer shape” or “outline”). In other words, the outer shape of the base 20 is not a perfect circle but a distorted circle. Although this will be described in detail later, this is because the base end portion 41 having a rectangular cross section of the intermediate member 40 (see FIG. 5) is pressed into a circular base portion 20 by a mold and expanded in the radial direction. The base 20 has an upper surface 21, a flat lower surface 22, and a peripheral side surface 23. On the upper surface 21, a plurality of linear protrusions 24 are provided in parallel at equal intervals as an example of a plurality of convex portions. Each protrusion 24 is a protrusion that is elongated and extends in one direction along the upper surface 21, and extends parallel to the vertical direction based on the paper surface of FIG. 2. Therefore, the ridges 24 near the edges of the base 20 on the left and right sides of FIG. 2 are shorter in the vertical direction than the ridges 24 on the left and right center side of FIG.

The shank portion 30 includes a base end portion 31 adjacent to the base portion 20 and a shank body 32 that is a portion above the base end portion 31. The vertical length of the base end portion 31 is much shorter than the vertical length of the shank main body 32, and therefore, most of the vertical length of the shank portion 30 is occupied by the shank main body 32. The cross section of the base end portion 31 is an ellipse that is slightly longer in the vertical direction of FIG. 4, and the elliptic cross section gradually decreases from the lower end to the upper end of the base end portion 31. Therefore, the outer peripheral surface of the base end portion 31 is inclined upward. At a position approximately half the height of the shank body 32 in the vertical direction, the cross section along the horizontal plane perpendicular to the vertical direction is a rectangle (see FIG. 3), and this rectangular cross section is gradually reduced from below to the sharp tip 32a. To do. The shape of the shank body 32 is the shape of the intermediate member 40 (see FIG. 5), which will be described later, that is substantially left as it is, and can be said to be a shape close to a wedge shape. Note that the cross-sectional shape of the intermediate member 40 is not necessarily rectangular, and as can be seen from the method of manufacturing the intermediate member 40 described later, the intermediate member 40 may be a quadrilateral such as a trapezoid, a rhombus, a bowl, a triangle, a pentagon, It may be a polygon with corners, such as a square. As shown in FIG. 3, the rectangular cross section of the shank body 32 has a short side 33 and a long side 34. As can be seen from FIG. 2, the protrusion 24 on the upper surface 21 of the base portion 20 described above is parallel to the short side 33 of the shank body 32 and perpendicular to the long side 34. In the button stopper 10, the rectangular shape that is the outer peripheral shape of the shank body 32 that is the majority of the shank portion 30 and the circular shape that is the outer peripheral shape of the base portion 20 are dissimilar.

FIG. 5 shows a substantially triangular column-shaped intermediate member 40 that becomes the button stopper 10. The intermediate member 40 continuously cuts the metal plate member 40a shown in FIGS. 6 and 7 into a substantially triangular shape by the upper blade 49a and the lower blade 49b shown in FIG. 7 along the two-dot broken line shown in FIG. Is obtained continuously. The intermediate member 40 includes a base end portion 41 on the base side of the triangle and a tip end portion 42 having a tip 42a on the apex side of the triangle. The intermediate member 40 has a rectangular bottom surface 43 and four side surfaces 44 extending from the bottom surface 43 to the tip 42a. The cross section parallel to the bottom surface 43 of the intermediate member 40 is a rectangle, and this rectangular cross section gradually decreases from the bottom surface 43 to the tip 42a. As described above, the outer peripheral shape of the base end portion 41 of the intermediate member 40 is a rectangle, which is not similar to the circular shape that is the outer peripheral shape of the base portion 20 of the button stopper 10. Since the intermediate member 40 is cut by slicing the plate member 40a with the upper blade 49a and the lower blade 49b as understood from the manufacturing method, a shearing force acts. At this time, since the shearing force applied to the distal end side of the intermediate member 40 exceeds the bending moment, the distal end of the intermediate member 40 is sheared so as to be twisted. In this way, the plate material 40a is cut so that the tip is twisted, but the tip shape obtained by this twisting shear is a very sharp and sharp shape, and thus the piercing force to the fabric is very strong. Therefore, in the present embodiment, it is conveniently explained that the rectangular cross section of the intermediate member gradually decreases from the bottom surface 43 toward the tip 42a, but actually, the four side surfaces 44 are distorted unevenly, which further increases the tip 42a. Become sharp. Since the base end side of the intermediate member 40 is relatively larger than the central portion in the longitudinal direction, the amount of material to be cut out is relatively large, so there is no difference in the cross section before cutting and the cross sectional shape after cutting. For the intermediate member 40, a direction orthogonal to the direction extending from the bottom surface 43 to the tip 42a is referred to as a “radial direction”. The radial direction of the intermediate member 40 corresponds to the radial direction orthogonal to the direction in which the shank portion 30 extends in the button stopper 10, and the base portion 20 extends in this radial direction.

Next, a mold for pressing the intermediate member 40 into the button stopper 10 will be described. Referring to FIG. 8, the mold includes a holding die 50 that holds the intermediate member 40 with its proximal end portion 41 exposed, and presses the proximal end portion 41 of the intermediate member 40 against the holding die 50 in the radial direction. And a press die 60 for plastic deformation to the base 20 of the button stopper 10. As described above, the rectangular outer peripheral shape of the base end portion 41 of the intermediate member 40 is not similar to the circular outer peripheral shape of the base portion 20 of the button stopper 10. Hereinafter, the vertical and horizontal directions of the holding die 50 and the press die 60 are based on the paper surface of FIG. 8 unless otherwise specified. Actually, the holding die 50 and the press die 60 are arranged not in the vertical direction but in the horizontal direction, and the vertical direction based on the paper surface of FIGS. 9 to 11 is along the vertical direction according to the actual gravity. However, for convenience of explanation, the top, bottom, left, and right are based on the paper surface of FIG. The holding mold 50 includes a pair of left and right first molds 50a and second molds 50b. The first mold 50 a and the second mold 50 b include opposing side surfaces that face each other and a bottom surface 52 that faces the press mold 60. One of the first mold 50a and the second mold 50b is movable with respect to the other. As a result, the first and second molds 50a and 50b have an open state (see FIGS. 9 and 10) in which the opposing side surfaces 51 are separated from each other and a closed state in which the opposing side surfaces 51 are in contact with each other (see FIGS. 8 and 11). Can take.

In each of the opposing side surfaces 51 of the first mold 50a and the second mold 50b, a depression 53a is provided along the vertical direction. Each recess 53a has a concave arc. These depressions 53a form a cylindrical space 53 in a closed state in which the opposing side surfaces 51 of the first and second molds 50a and 50b are in contact with each other. As will be described later, the space 53 accommodates a portion excluding the base end portion 41 of the intermediate member 40. The lower end portion of each recess 53a is provided with an inclined portion 54a in which the diameter of the concave arc of each recess 53a gradually increases toward the lower ends of the first and second molds 50a, 50b. Although these inclined portions 54a will be described in detail later, the first die 50a and the second die 50b are closed after the intermediate member 40 is disposed therebetween, thereby closing the portion adjacent to the base end portion 41 of the intermediate member 40 ( (Hereinafter referred to as “proximal end portion of the base end”) 42 b functions as a shank base end forming portion 54 that forms the base end portion 31 of the shank portion 30 of the button stopper 10. Therefore, the outer shape of the shank base end molding portion 54 of the holding die 50 matches the base end portion 31 of the shank portion 30 of the button stopper 10, and the horizontal cross section of the shank base end molding portion 54 is the front-back side of the page of FIG. It is an ellipse that is slightly longer in the direction (than in the left-right direction).

FIG. 9 shows the bottom surfaces 52 of the first mold 50a and the second mold 50b in a state where the space between the opposing side surfaces 51 is open. The first and second molds 50 a and 50 b have upper molding concave halves 55 a that are slightly recessed from the bottom surface 52. These upper molding concave half portions 55a are upper moldings that are cavities for molding the upper surface 21 side of the base 20 of the button stopper 10 in the closed state of the first and second molds 50a and 50b (see FIG. 11 and the like). A recess 55 is formed. The contour of the upper molding recess 55 is a perfect circle, and the outer shape of the upper molding recess half 55a is a semicircle obtained by dividing the perfect circle into two. The bottom surface (upper surface) 55b of each upper molding concave half 55a functions as a molding surface for molding the upper surface 21 of the base 20 of the button stopper 10. A plurality of linear grooves 56 are provided at equal intervals and in parallel on the bottom surface 55b. These grooves 56 are formed in parallel to the opposing side surfaces 51 of the first and second molds 50a, 50b. The direction in which the groove 56 extends is parallel to the short side 43a of the rectangular shape at the base end portion 41 of the intermediate member 40 disposed between the first and second molds 50a and 50b and is perpendicular to the long side 43b. The grooves 56 correspond to the protrusions 24 on the upper surface 21 of the base 20 of the button stopper 10, and therefore, the total number of grooves 56 included in the first and second molds 50 a and 50 b is the protrusions in the button stopper 10. Basically equal to the number of 24. In the present embodiment, the upper molding recess 55 is provided on the bottom surface 52 of the holding mold 50, but such a molding recess is not provided on the bottom surface 52 of the holding mold 50, but a groove or the like is simply formed on the bottom surface 52 of the holding mold 50. There is also an aspect in which a molding surface is provided.

Referring to FIG. 8, the press die 60 has a lower molding recess 62 that is recessed downward from the upper surface 61 thereof. The lower molding recess 62 is a cavity for molding the lower surface 22 side of the base 20 of the button stopper 10. The contour of the lower molding concave portion 62 is a perfect circle having the same dimensions as the upper molding concave portion 55 in which the two upper molding concave half portions 55 a are combined, and the depth of the lower molding concave portion 62 is deeper than that of the upper molding concave portion 55. Further, the bottom surface (lower surface) 62a of the lower molding recess 62 is a flat surface without irregularities.

Next, a process of forging the intermediate member 40 into the button fastener 10 by the holding die 50 and the press die 60 will be described. This process is divided into 1) a step before closing the first die 50a and the first die 50b from the open state, and 2) a step after moving the press die 60 to the holding die 50 in the closed state and pressing it. . First, the previous step will be described. The intermediate member 40 is disposed between the first mold 50a and the second mold 50b in the open state (see FIG. 9) (see FIG. 10). The arrangement of the intermediate member 40 with respect to the first and second molds 50a and 50b is as follows. The base end portion 41 of the intermediate member 40 protrudes toward the press die 60 from the bottom surfaces 52 of the first and second dies 50a and 50b (strictly speaking, the bottom surface 55b of the upper molding concave half 55a). Parts other than the base end part 41 of the intermediate member 40, that is, the front end part 42 including the front end 42a and the base end adjacent part 42b face the front end 42a upward so as to correspond to the depressions 53a of the first and second molds 50a, 50b. Is set. At this time, as shown in FIG. 10, the intermediate member 40 has the short side 43 a of the rectangular outer shape of the intermediate member 40 parallel to the groove 56 of the upper molding concave half 55 a and the long side 43 b to the groove 56. Oriented to be vertical. In other words, the short side 43 a of the rectangular cross section of the intermediate member 40 is parallel to the groove 56, and the long side 43 b is perpendicular to the groove 56. Next, the first mold 50a and the second mold 50b in the open state are closed as shown in FIG. With reference to FIG. 8 corresponding to the CC cross section of FIG. 11, the two recesses 53a are joined to the portion excluding the base end portion 41 of the intermediate member 40 by the closing operation of the first and second molds 50a and 50b. The space 53 is accommodated. At the same time, the base end adjacent portion 42 b of the intermediate member 40 is formed from a cross-sectional rectangle to a cross-sectional ellipse by the shank base end forming portion 54, and becomes the base end portion 31 of the shank portion 30 of the button stopper 10. The intermediate member 40 is fixed to the holding die 50 while the base end portion 41 is exposed downward by accommodating the portion other than the base end portion 41 of the intermediate member 40 in the space 53 and molding by the shank base end molding portion 54. Retained.

Next, the following steps will be described. The press die 60 is moved toward the holding die 50 holding the intermediate member 40 with the base end portion 41 exposed. As a result, the base end portion 41 of which the outer peripheral shape of the intermediate member 40 is rectangular is pressed by the bottom surface 62a of the lower molding recess 62 of the press die 60, and as shown in FIG. 12, the bottom surface 62a of the lower molding recess 62 and the holding die 50 is deformed plastically so as to expand in the radial direction while being crushed in the vertical direction between the bottom surface 55b of the upper molding recess 55, and finally the outer peripheral shape of the button stopper 10 becomes the circular base portion 20. Referring to FIG. 11, the long side 43b side of the rectangular outer shape of the base end portion 41 of the intermediate member 40 has a larger interval than the short side 43a side with respect to the peripheral edge of the upper molding recess 55 of the holding die 50. I understand. Therefore, in order to successfully plastically deform the base end portion 41 having the rectangular outer shape into the base portion 20 having the circular outer shape, the long side 43b side of the base end portion 41 is expanded more in the radial direction than the short side 43a side. There is a need. In order to realize this, the plastic flow in the radial direction of the metallic material forming the base end portion 41 of the intermediate member 40 is controlled as follows by the groove 56 of the upper forming recess 55 of the holding die 50.

In the plastic flow direction x (see FIG. 11), which is a radial direction parallel to the groove 56 in the 360-degree radial direction in the upper forming recess 55 of the outer circular shape, the material enters the groove 56 along the plastic flow direction x. However, it is thought that the material movement is facilitated. Therefore, assuming a flat plastic flow direction (hereinafter referred to as “neutral direction”) in which the bottom surface 55b of the upper molding recess 55 has no irregularities such as the grooves 56, the material movement amount in the plastic flow direction x is plastic flow in the neutral direction. It is expected to increase more than the direction. On the other hand, in the plastic flow direction y (see FIG. 11) which is a radial direction perpendicular to the groove 56 among the radial directions over 360 degrees, the material flows into the groove 56 perpendicular to the plastic flow direction y and the plastic flow direction y. Therefore, the material flow amount in the plastic flow direction y is considered to be smaller than the material flow amount in the neutral direction. Therefore, the metal material forming the base end portion 41 of the intermediate member 40 expands more in the radial direction in the plastic flow direction x than in the plastic flow direction y. Thereby, the base end portion 41 of the outer rectangular shape is easily deformed into the base portion 20 of the outer circular shape. The upper forming concave portion 55 having an outer circular shape helps to make the outline of the base portion 20 more beautiful. However, even if there is no upper molding recess 55, the outline of the base 20 can be brought close to a perfect circle only by the function of the groove 56. A protrusion 24 corresponding to the groove 56 is formed on the upper surface 21 of the base 20 of the molded button stopper 10.

FIG. 13 is a partial cross-sectional side view showing a state in which a shell cap (hereinafter simply referred to as “shell”) 70 is attached to the completed button stopper 10. FIG. 14 is a top view of the button stopper 10 with the shell 70 of FIG. The shell 70 is a metal part made of a copper alloy, an aluminum alloy, or the like. The shell 70 includes a disk-shaped bottom portion 71, a circumferential side portion 72 that bends upward from the radially outer end of the bottom portion 71, and an annular upper portion 73 that bends radially inward from the upper end of the circumferential side portion 72. The shell 70 is assembled to the base portion 20 of the button stopper 10 so that the bottom portion 71 covers the lower surface 22 thereof. In the assembled state, the peripheral side portion 72 is spaced from the peripheral side surface 23 of the base portion 20, and the upper portion 73 of the upper portion 73 is in contact with the radially outer portion of the upper surface 21 of the base portion 20. As described above, in the button stopper 10, the outer shape of the base portion 20 is close to a perfect circle, so that the centering of the shank portion 30 and the base portion 20 is easy, and the button stopper (10) It is possible to substantially eliminate problems that hinder the work of fixing the shell 70 to the button stopper 10 or the work of fixing the button stopper 10 (not shown). Further, even if the shell 70 tries to rotate with respect to the base 20 of the button stopper 10, the protrusion 24 on the upper surface 21 can be prevented from becoming a resistance, and the shell 70 is not detached from the base 20.

In the above embodiment, when the base end portion 41 of the intermediate member 40 having the rectangular outer shape is pressed into the base portion 20 of the button stopper 10, the contour has the bottom surface 55 b of the upper molding concave portion 55, that is, the molding surface 55 b. A holding mold 50 was used. A plurality of grooves 56 along the vertical direction based on the paper surface of FIG. 15 and 16 show another example of a holding die for forging the base end portion 41 of the outer member 40 having an outer rectangular shape into a circular base portion. Hereinafter, in the description based on FIGS. 15 to 19, the vertical direction and the horizontal direction of the holding mold, the base end portion of the intermediate member, and the like are based on the drawings being referred to. FIG. 15A shows a bottom surface 81 of a holding mold 80 composed of a first mold 80a and a second mold 80b. The opposing side surface (51), the depression (53a), and the shank base end molding portion (54) in the first and second molds 80a and 80b are the same as those of the holding mold 50, and this point will be described below. The same applies to the holding

molds

90, 100, 110, 120, 140, 150, and 160. The holding mold 80 is not provided with an upper molding recess, and a plurality of grooves 86 along the vertical direction are provided on the bottom surface 81 of the holding mold 80 to form the molding surface 81. FIG. 15B is a DD cross section of FIG. The arrangement of the intermediate member 40 with respect to the holding die 80 is the same as that of the holding die 50 so that the short side 43a of the base end portion 41 is parallel to the groove 86 and the long side 43b is perpendicular to the groove 86. Set. Also in this case, the metal material forming the base end portion 41 moves more in the plastic flow direction x along the groove 86 than in the plastic flow direction y perpendicular to the groove 86. As a result, the base end portion 41 of the outer shape rectangle becomes the base portion of the outer shape that is substantially the same as the base portion 20. A protrusion corresponding to the groove 86 is formed on the upper surface of the base. The circular outer shape of the base portion is adjusted by the contour-shaped lower molding recess 62 on the press die 60 side, although the holding mold 80 does not have the contour-shaped upper molding recess.

FIG. 16A shows a bottom surface 91 of the holding mold 90 composed of the first mold 90a and the second mold 90b. An upper molding recess 92 having a circular outline is formed on the bottom surface 91 of the holding mold 90. A plurality of projections 94 as a plurality of convex portions are provided on the bottom surface (molding surface) 93 of the upper molding concave portion 92. FIG. 16B is an EE cross section of FIG. The protrusions 94 are relatively few in the plastic flow direction x and the vicinity thereof, and relatively many are provided in the plastic flow direction y and the vicinity thereof. Therefore, on the bottom surface 93 of the upper molding recess 92, a relatively dense region of protrusions 94 exists in the plastic flow direction x and its vicinity, and a relatively rough region of protrusions 94 exists in the plastic flow direction y and its vicinity. To do. The intermediate member 40 is held with respect to the holding mold 90 such that the short side 43a of the rectangular shape of the base end portion 41 is along the vertical direction and the long side 43b is along the left-right direction. By pressing the press die 60 against the holding die 90, the metal material forming the base end portion 41 of the intermediate member 40 expands in the upper forming recess 92 in the radial direction. At this time, in the plastic flow direction x, since there are many protrusions 94, the movement of the material is hindered, whereas in the plastic flow direction y, since the protrusions 94 are relatively few, the hindrance to the material movement is in the plastic flow direction x. Small compared. As a result, the base end portion 41 plastically flows more in the plastic flow direction x than in the plastic flow direction y, resulting in the base portion of the outer circular button stopper 10. A large number of depressions corresponding to the protrusions 94 are formed on the upper surface of the base portion, and such depressions are useful for preventing the shell cap 70 from being displaced. The upper molding recess 92 of the holding mold 90 supports the outer shape of the base to be a beautiful circle.

The example in the case where the outer circular base 20 of the button stopper 10 is formed from the base end 41 of the outer rectangular shape of the intermediate member 40 has been described above. Next, based on FIGS. An example in the case of forging from the base end portion 41 to the non-circular base portion 20 will be described. In addition, the arrangement of the intermediate member 40 with respect to each holding

mold

100, 110, 120 is similar to the above-described example, the short side 43a of the rectangular shape of the base end portion 41 is along the vertical direction, and the short length 43b is the horizontal direction. To be along. FIG. 17 shows the bottom surface 101 of the holding mold 100 composed of the first mold 100a and the second mold 100b. On the bottom surface 101 of the holding mold 100, an oval upper molding recess 102 having a long outline in the left-right direction is formed. A plurality of grooves 104 as a plurality of recesses are provided on the bottom surface (molding surface) 103 of the upper molding recess 102 as follows. That is, in the four plastic flow directions z between the plastic flow direction x and the plastic flow direction y, the plurality of grooves 104 are formed in parallel so as to be orthogonal to the plastic flow direction z. In the plastic flow direction z, the groove 104 is set so that its length increases from the center side of the upper molding recess 102 to the outer side (edge side). The groove 104 acts to divert the metallic material flowing along the plastic flow direction z from the plastic flow direction z. Therefore, the amount of material movement is smaller in the plastic flow direction z than the plastic flow directions x and y, which are neutral directions without unevenness in this example, and finally an oval base (not shown) whose outer shape is long from side to side. It becomes. A protrusion (not shown) corresponding to the groove 104 is formed on the base.

FIG. 18 shows the bottom surface 111 of the holding mold 110 composed of the first mold 110a and the second mold 110b. On the bottom surface 111 of the holding mold 110, a diamond-shaped upper molding recess 112 having a long outline in the left-right direction is formed. The bottom surface (molding surface) 113 of the upper molding recess 112 is provided with a plurality of grooves 114 and protrusions 115 as a plurality of recesses and projections as follows. That is, a plurality of protrusions 115 parallel to the plastic flow direction y are provided in the plastic flow direction y. Each protrusion 115 has the same length. In addition, a plurality of parallel grooves 114 intersecting the plastic flow direction z are formed in the four plastic flow directions z between the plastic flow directions x and y, respectively. In this example, the plastic flow direction x is a neutral direction without unevenness. Each groove 114 has the same length and has a contour parallel to the nearest edge of the diamond-shaped upper molding recess 112. In the plastic flow direction z, the groove 114 acts to divert the metal material flowing along the plastic flow direction z from the plastic flow direction z. Therefore, the amount of material movement is smaller in the plastic flow direction z than in the plastic flow directions x and y. In the plastic flow direction y, the material that has entered between the plurality of protrusions 115 is guided between the protrusions 115 and flows without deviating from the plastic flow direction y. Therefore, the amount of material movement in the plastic flow direction y is greater than in the plastic flow directions x and z. Accordingly, the amount of material movement decreases in the order of the plastic flow directions y, x, and z, and finally, the outer shape becomes a rhombus-shaped base (not shown). On the upper surface of the base portion, protrusions and grooves (not shown) corresponding to the grooves 114 and the protrusions 115 are formed.

FIG. 19 shows the bottom surface 121 of the holding mold 120 including the first mold 120a and the second mold 120b. On the bottom surface 121 of the holding mold 120, an upper molding concave portion 122 having a rectangular outline with rounded corners is formed. In addition, since the outer peripheral shape of the rounded rectangle of the upper molding recess 122 cannot be obtained evenly by enlarging the outer peripheral shape of the rectangular of the base end portion 41 of the intermediate member 40, both outer peripheral shapes Can be said to be in a non-similar relationship. A plurality of protrusions 124 as a plurality of convex portions are provided on the bottom surface (molding surface) 123 of the upper molding recess 122 as follows. That is, a plurality of parallel protrusions 124 perpendicular to the plastic flow directions x and y are provided in the plastic flow directions x and y, respectively. Each protrusion 124 formed in the plastic flow direction x has the same length, and each protrusion 124 formed in the plastic flow direction y also has the same length. The protrusions 124 in the plastic flow directions x and y, respectively, serve as resistance to the material flowing in the plastic flow directions x and y. As a result, the amount of material movement in the plastic flow directions x and y decreases, but the material gathers in the plastic flow direction z, which is the neutral direction between the plastic flow direction x and the plastic flow direction y. As a result, a base portion (not shown) having a rectangular outer peripheral shape with rounded corners is formed. A groove (not shown) corresponding to the protrusion 124 is formed on the upper surface of the base. In this example, the ridge 124 is provided as an example. However, even if the entire ridge 124 is replaced with a groove, a base portion having a rectangular outer periphery with rounded corners can be obtained.

The example in which the outer peripheral shape of the base end portion of the intermediate member is rectangular has been described above, but the present invention is not limited to this, and for example, the outer periphery of the base end portion of the intermediate member as described below The shape may be circular. FIG. 20 is a bottom view of the conical columnar intermediate member 130. The intermediate member 130 has a circular bottom surface 133, and the outer peripheral shape of the base end portion 131 and the distal end portion (not shown), that is, the horizontal cross section is also circular. By using the holding

molds

140, 150, and 160 shown in FIGS. 21 to 23 together with the press die 60 described above, the base end portion 131 of the intermediate member 130 having such a circular outer peripheral shape is used in the horizontal direction. Can be forged into a base (not shown) of a button fastener having a long oval, octagonal or square perimeter. Similarly to the intermediate member 40 described above, the intermediate member 130 is held with the proximal end 131 exposed to the holding

molds

140, 150, and 160, and the first molds 140a, 150a, and 160a that form the holding molds. When the second molds 140b, 150b, and 160c are closed, the base end adjacent portion adjacent to the base end portion 131 is formed from a circular cross section to a cross sectional ellipse.

FIG. 21 shows the bottom surface 141 of the holding mold 140 composed of the first mold 140a and the second mold 140b. The bottom surface 141 is provided with an oval upper molding recess 142 whose outline is long in the left-right direction. On the bottom surface (molding surface) 143 of the upper molding concave portion 142, a plurality of protrusions 144 as a plurality of convex portions are generally provided in parallel along the left-right direction. Such a protrusion 144 is resistant to a material flowing in the plastic flow direction x, is not resistant to a material flowing in the plastic flow direction y, but rather prevents the material from deviating from the plastic flow direction y. To guide. Therefore, the material movement amount in the plastic flow direction x decreases, and the material movement amount in the plastic flow direction y increases. As a result, the outer circular base end 131 of the intermediate member 130 is formed into an oval outer base (not shown) that is long to the left and right of the button fastener. A groove (not shown) corresponding to the protrusion 144 is formed on the upper surface of the base.

FIG. 22 shows a bottom surface 151 of the holding mold 150 composed of the first mold 150a and the second mold 150b. The bottom surface 151 is provided with an upper molding recess 152 having a regular octagonal outline. The bottom surface (molding surface) 153 of the upper molding recess 152 is provided with eight ridges 154 extending from the center of the octagon to each corner of the octagon as a plurality of convex portions. Further, on the bottom surface 153, a plurality of grooves 155 perpendicular to the radial direction are provided in parallel in each of the eight trapezoidal regions 156 between two protrusions 154 adjacent in the circumferential direction. When the base end 131 of the intermediate member 130 is pressed, the metal material forming the base end 131 flows in the radial direction in each trapezoidal region 156 and enters the groove 155 in a direction perpendicular to the radial direction. On the other hand, the flow range is limited in each trapezoidal region 156 by the resistance of each protrusion 154. As a result, the circular base end 131 of the intermediate member 130 is formed into a regular octagonal base (not shown) of the button fastener. Grooves and ridges (not shown) corresponding to the ridges 154 and the groove 155 are formed on the upper surface of the base.

FIG. 23 shows the bottom surface 161 of the holding mold 160 composed of the first mold 160a and the second mold 160b. The bottom surface 161 is provided with an upper molding recess 162 having a square outline. A plurality of grooves 164 are provided on the bottom surface 163 of the upper molding recess 162 as a plurality of recesses as follows. That is, in each of the four regions 165 divided by the square diagonal of the upper molding recess 162, a plurality of grooves 164 are formed to be parallel to one side corresponding to each region 165 in the square. When the base end portion 131 of the intermediate member 130 is pressed, the metal material forming the base end portion 131 flows in the radial direction in each region 165, and enters the groove 164 in the plastic flow directions x and y while being plastic. Due to the deviation from the flow directions x and y, the material collects in the plastic flow direction z. As a result, the circular base end 131 of the intermediate member 130 is formed into a square base (not shown) of the button fastener. On the upper surface of the base portion, a protrusion (not shown) corresponding to the groove 164 is formed. In this example, a protrusion may be similarly provided on the bottom surface 163 of the upper molding recess 162 instead of the groove 164.

24 and 25 are cross-sectional explanatory views showing states in which the

buttons

180 and 200 are attached to the

fabrics

1 and 2 using the

metal button fasteners

170 and 190 obtained by the manufacturing method according to the present invention described above. It is. The button stopper 170 includes a disk-shaped base portion 171 and a shank portion 172 extending from the base portion 171. The shank portion 172 is shown in a crimped state in FIG. The button 180 is a decorative button also called a bar, and includes a dome portion 181 and a flange portion 182 that extends radially outward from the dome portion 181. When the button 180 is attached to the fabric 1 with the button fastener 170, the shank portion 172 of the button stopper 170 is pierced into the fabric 1 and then the shank portion 172 is crimped in the space inside the dome portion of the button 180.

Referring to FIG. 25, the button stopper 190 includes a disk-shaped base portion 191 and a shank portion 192 extending from the base portion 191. The shank portion 192 is shown in a state where the tip portion is crimped in FIG. The button 200 is of a type that can be inserted into and removed from the button hole, and includes a body part 201 and a head part 202 having a diameter larger than that of the body part 201. The button 200 is also composed of the following three members. That is, the outer shell member 203 that forms the outer peripheral surface of the body portion 201 and the lower surface of the head 202; the cover member 204 that forms the upper surface of the head 202; and the head-corresponding portion of the outer shell member 203 and the cover member 204 It is the head core member 205 arrange | positioned between. The head-corresponding portion of the outer shell member 203 and the cover member 204 are connected at the peripheral side portion of the head 202. The outer shell member 203 includes a cylindrical portion 206 that extends upward from the lower end of the outer peripheral surface of the barrel portion 201 inside the barrel portion 201. When the button 200 is attached to the fabric 2 with the button fastener 190, the shank portion 192 of the button fastener 190 is pierced through the fabric 2 and further passed through the cylindrical portion 206 of the button 200, and then the shank portion 192 by the head core member 205. Clamp the tip of the. Although not shown in FIGS. 24 and 25, a shell cap as indicated by reference numeral 70 in FIG. 13 may be attached to the

bases

171 and 191 of the

button stoppers

170 and 190.

As shown in the above embodiments, the material flow in the radial direction of the base end is controlled by the plurality of concave portions or the plurality of convex portions on the molding surface. Therefore, it is natural that the shape, number, and direction of the concavo-convex portions can be arbitrarily changed within the scope of the present invention in order to control the flow of the metal material at the base end portion. By changing, the plastic flow can be promoted or suppressed in the neutral direction, and the base portion having the target outer peripheral shape can be formed.

10, 170, 190

Button stopper

20, 171, 191 Base 21 Base top surface 22 Base bottom surface 24

Projection

30, 172, 192 Shank portion 31 Shank base end 32 Shank body 32a Tip 33 Short side of shank body 34 Long side of shank body 40, 130 Intermediate member
41, 131 Base end portion of the intermediate member 42 Tip portion 42a Tip 43a Short side of the base end portion of the intermediate member 43b Long side of the base end portion of the

intermediate member

50, 80, 90, 100, 110, 120, 140, 150, 160 Holding mold 50a, 80a, 90a, 100a, 110a, 120a, 140a, 150a, 160a First mold 50b, 80b, 90b, 100b, 110b, 120b, 140b, 150b, 160b Second mold 51 Opposing side surfaces 52, 91, 101, 111, 121, 141, 151, 161 Bottom surface of holding

mold

55, 92, 102, 112, 122, 142, 152, 162 Upper molding recess 55b, 93, 103, 113, 123, 143, 153, 163 Upper molding The bottom of the recess (molded surface)
56, 86, 104, 114, 155, 164 groove (recess)
60 Press mold 62 Lower molding recess 70 Shell cap 81 Bottom of holding mold (molding surface)
94 Protrusion (convex part)
115, 124, 144, 154 Projection (convex part)

Claims

A shank portion (30, 172, 192) and a plate-like base portion extending in a radial direction intersecting with a direction in which the shank portion (30, 172, 192) extends on the proximal end side of the shank portion (30, 172, 192) A metal button stopper (10, 170, 190) comprising (20, 171, 191),
A columnar intermediate member (40, 130) serving as the button stopper (10), wherein the base end (41, 131) of the intermediate member (40, 130) is pressed using a mold and radiated. In step A, the base portion (20, 171, 191) is expanded in the direction, and the outer peripheral shape of the base end portion (41, 131) of the intermediate member (40, 130) and the button stopper (10) Including a step A in which the outer peripheral shape of the base (20, 171, 191) is dissimilar;
The mold includes holding molds (50, 80, 90, 100, 110, 120, 140, 150, 160) that hold the intermediate members (40, 130) by exposing the base end portions (41, 131). A pressing die (60) for pressing the base end portion (41, 131) of the intermediate member (40, 130) against the holding die (50, 80, 90, 100, 110, 120, 140, 150, 160); With
The holding mold (50, 80, 90, 100, 110, 120, 140, 150, 160) has a surface (21) on the shank portion (30, 172, 192) side of the base portion (20, 171, 191). Having molding surfaces (55b, 81, 93, 103, 113, 123, 143, 153, 163) to be molded;
The molding surface (55b, 81, 93, 103, 113, 123, 143, 153, 163) has a plurality of concave portions (56, 86, 104, 114, 155, 164) or convex portions (94, 115, 124, 144, 154)
In the step A, the molding surface (55b, 81, 93, 103, 113, 123, 143, 153, 163) of the holding mold (50, 80, 90, 100, 110, 120, 140, 150, 160) The base end portion (41, 131) is moved to the base portion (20, 171, 191) by the concave portion (56, 86, 104, 114, 155, 164) or the convex portion (94, 115, 124, 144, 154). When the plastic deformation is performed, the material flow in the radial direction of the base end portions (41, 131) is controlled.
In the step A, the concave portion (56, 86, 104, 114, 155, 164) or the convex portion (94, 115, 124, 144, 154) is the base end portion (41, 130) of the intermediate member (40, 130). 131) is arranged such that when the plastic flow in the radial direction, another plastic flow direction having a material movement amount different from that of the one plastic flow direction is generated, and the base end portion (41, 130) of the intermediate member (40, 130) is formed. 131. The method of manufacturing a button fastener according to claim 1, wherein the material flow is controlled so that an outer peripheral shape of 131) and an outer peripheral shape of the base portion (20, 171 and 191) are non-similar. .
The molding surface (55b, 81, 101, 111, 121, 141, 151, 161) of the holding mold (50, 80, 100, 110, 120, 140, 150, 160) is the plurality of concave portions or convex portions. 3. A plurality of grooves (56, 86, 104, 114, 155, 164) or protrusions (124, 144) extending linearly in a direction intersecting the radial direction. A method for manufacturing button fasteners.
The molding surface (55b, 81, 101, 111, 121, 141, 151, 161) of the holding mold (50, 80, 100, 110, 120, 140, 150, 160) is the plurality of concave portions or convex portions. The button stop according to claim 1 or 2, wherein the button stop has a plurality of parallel grooves (56, 86, 104, 114, 155, 164) or protrusions (115, 124, 144) extending along one direction. Production method.
The protrusion is a protrusion (94);
The button according to claim 1 or 2, wherein the molding surface (93) of the holding mold (90) includes a region where the protrusions (94) are relatively dense and a region where the protrusions (94) are relatively rough. A manufacturing method of a fastener.
The holding mold (50, 100, 110, 120, 140, 150, 160) has a molding recess (55, 92, 102, 112, 122, 142) that matches the outer peripheral shape of the base (20, 171, 191) to be molded. 152, 162), and the molding surface (55b, 93, 103, 113, 123, 143, 153, 163) of the molding recess (55, 92, 102, 112, 122, 142, 152, 162). Bottom surfaces (55b, 93, 103, 113, 123, 143, 153, 163), and bottom surfaces (55b, 93, 103, 162) of the molding recesses (55, 92, 102, 112, 122, 142, 152, 162). 113, 123, 143, 153, 163) and the concave portions (56, 104, 114, 155, 164) or convex portions (94, 115, 124, 144). Method for producing a button fastener according to any one of claims 1 to 5, 154) is formed.
The manufacturing method of the button fastener of Claim 1 including the process of cut | disconnecting a substantially triangular-shaped part as a said intermediate member (40) from a board | plate material (40a).
A shank portion (30, 172, 192) and a plate-like base portion extending in a radial direction intersecting with a direction in which the shank portion (30, 172, 192) extends on the proximal end side of the shank portion (30, 172, 192) A metal button stop (10, 170, 190) comprising (20, 171, 191),
The base portions (20, 171 and 191) are formed by pressing the base end portions (41 and 131) of the intermediate members (40 and 130) to be the button fasteners (10) using a mold, and thus in the radial direction. Extended to
The outer peripheral shape of the shank portion (30, 172, 192) and the outer peripheral shape of the base portion (20, 171, 191) are non-similar shapes,
The button stopper which has a some convex part (24) or a recessed part in the surface (21) by the side of the shank part (30,172,192) of the said base part (20).
The button stopper according to claim 8, wherein the plurality of protrusions or recesses are a plurality of protrusions (24) or grooves extending linearly in a direction intersecting the radial direction.
The button stopper according to claim 8, wherein the plurality of protrusions or recesses are a plurality of parallel protrusions (24) or grooves extending along one direction.
The outer shape of the shank portion (30, 172, 192) is a polygon, and the outer shape of the base portion (20, 171, 191) is a circle. Button fastener as described in.
The base (20, 171 and 191) is attached to the base (20, 171 and 191) so as to cover the surface (22) opposite to the surface (21) on the shank part (30, 172 and 192) side. The button stop according to any one of claims 8 to 11, comprising a shell cap (70).