JP5525037B2 - Button surface member, button surface member forming method, and button - Google Patents

Description

  The present invention relates to a button surface member, a button surface member forming method, and a button, and more specifically, a shallow circular cup-shaped metal button surface member added to the head of the button, and such a button surface member. And a button to which such a button surface member is added.

  2. Description of the Related Art As buttons and button fasteners, those having a main body and a shallow circular cup-shaped button surface member that is attached to the head of the main body for decoration or reinforcement are known. The button surface member is formed by drawing a metal plate or the like, and is a shallow circular cup shape having a disk portion and a circumferential side portion extending in the axial direction from the periphery of the disk portion. In the button surface member, various decorative designs etc. have been conventionally engraved and printed on the surface of the disk part. However, in recent years, it has been adjusted independently of the peripheral side part or with the decorative part of the disk part. It is required to add letters, symbols, figures, patterns, and the like. As a method of giving characters, patterns, etc. to the peripheral side portion of the button surface member, Japanese Patent Laid-Open No. 2008-295846 first describes a circle after engraving predetermined characters, patterns, etc. on a circular region of a flat metal plate. A disk made of a ring region and its inner part is punched out of a metal plate, and then the button surface member is extruded and deep-drawn so that the annular region of the disk becomes a peripheral side and its inner part becomes a disk part. What is obtained is disclosed.

  However, in the method disclosed in the above-mentioned patent document, after a letter, a pattern or the like is imprinted on a flat annular area on a metal plate and punched out, the annular area becomes perpendicular to the inner part (disc part). Thus, there is a problem that characters, patterns and the like in the annular region (circumferential side portion) are distorted. Further, if the marking on the annular region is deep, the marking may be crushed or damaged at the time of subsequent extrusion and deep drawing, so that there is a problem that a deep and clear character or the like cannot be given to the peripheral side portion.

JP 2008-295846 A

  The present invention has been made paying attention to the problems as described above, and its purpose is to provide a clear button surface member without distortion of the peripheral side inscription, a method for forming such a button surface member, and It is providing the button provided with such a button surface member.

  In order to solve the above problems, according to the present invention, a circular portion having a disc portion and an annular peripheral side portion extending in the axial direction (referring to a direction along the axis of the disc portion) from the periphery of the disc portion. A method of forming a cup-shaped metal button surface member, the step of squeezing a raised portion having a disk region and a peripheral region corresponding to the disk portion and the peripheral portion of the button surface member from a metal plate There is provided a button surface member forming method including: a step of separating the raised portion from the metal plate; and a step of engraving a circumferential region of the raised portion before or after the separating step.

  In the present invention, first, a circular cup-shaped ridge corresponding to the button surface member is drawn from the metal plate, and then the ridge is separated from the metal plate after engraving on the peripheral region of the ridge, or After separating the ridge from the metal plate, the ridge is engraved on the peripheral region of the ridge. A button surface member stamped on the peripheral side portion is obtained by imprinting characters, patterns, etc. on the peripheral region standing up with respect to the disc region and maintaining the standing state of the peripheral region with respect to the disc region. Therefore, characters, patterns and the like are not distorted.

  Preferred examples of the material for the metal plate include aluminum alloys and copper alloys, but are not limited thereto.

  As the inscription on the peripheral region of the raised portion, there can be used characters such as decoration and management, symbols, figures, patterns, and any combination thereof.

  In the present invention, the step of engraving may include an outer die having a convex portion or a concave portion corresponding to the indented shape from the radially outer side to the peripheral region of the raised portion from the radially inner side to the convex portion or the concave portion. This can be done by applying inner dies each having matching concave or convex portions. In this way, by applying the convex portion or concave portion of the outer die from the radially outer side to the peripheral region of the raised portion and the concave portion or convex portion of the inner die from the radial inner side, the peripheral region or button of the raised portion is applied. A clear marking can be given to the peripheral side portion of the surface member.

  According to another aspect of the invention, there is provided a circular cup-shaped metal button surface member having a disc portion and an annular circumferential side portion extending in the axial direction from the periphery of the disc portion, the circumferential side portion Has a mark, and the mark is provided with a button surface member including a recess recessed from one of the outer peripheral surface and the inner peripheral surface of the peripheral side portion and a protrusion protruding from the other. In the present invention, the marking on the peripheral side portion of the button surface member can be made clear from the depression and the protrusion.

  In the present invention, the peripheral side portion includes an inclined portion whose diameter gradually increases in one axial direction from the periphery of the disc portion, and a vertical portion extending in parallel to the axis from the end of the inclined portion opposite to the disc portion. Can be included. In this case, the marking can be provided so as to extend to the inclined portion and the vertical portion.

  According to still another aspect of the present invention, a button comprising a button main body and a circular cup-shaped metal button surface member attached to the button main body, wherein the button surface member includes a disc portion, a disc An annular peripheral side portion extending in one axial direction from the peripheral edge of the portion, the peripheral side portion has an inscription, the indentation recessed from one of the outer peripheral surface and the inner peripheral surface of the peripheral side portion, A button is provided that includes a protrusion protruding from the other. In the present invention, the marking on the peripheral side portion of the button surface member added to the button body can be made clear from the depression and the protrusion.

  In the button surface member forming method according to the present invention, the metal plate is drawn to form a circular cup-shaped raised portion, and then engraved on the peripheral region of the raised portion, which becomes the peripheral side portion of the button surface member as it is. Therefore, the marking on the peripheral side portion of the button surface member is not distorted and a clear marking can be given.

  In the button surface member according to the present invention, the marking on the peripheral side portion is formed of a depression and a protrusion, so that the marking is clear.

  In the button according to the present invention, the inscription on the peripheral side portion of the button surface member added to the button main body is formed of a depression and a protrusion, so that the inscription is clear.

FIG. 1 is a perspective explanatory view showing a state where a button surface member according to an embodiment of the present invention is cut off from a metal plate. FIG. 2 is a perspective explanatory view schematically showing an arrangement state of the metal plate and the punch immediately before the drawing process. FIG. 3 is a longitudinal sectional explanatory view showing a state in which the metal plate is squeezed out into a circular shallow cup shape by a punch. FIG. 4 is a perspective explanatory view schematically showing an arrangement state of the outer die punch and the inner die with respect to the peripheral region of the raised portion. FIG. 5 is an exploded perspective view illustrating a convex portion of the outer die punch. FIG. 6 is a broken perspective explanatory view showing an enlarged recess of the inner die. FIG. 7 is a longitudinal cross-sectional explanatory view showing a state immediately before marking on the peripheral region of the raised portion. FIG. 8 is a longitudinal cross-sectional explanatory view showing, in an enlarged manner, a state at the time of marking with respect to the peripheral region of the raised portion. FIG. 9 is an explanatory diagram of a horizontal section in the state of FIG. FIG. 10 is a longitudinal cross-sectional explanatory view showing a state where the outer die punch and the inner die are separated from the peripheral region of the raised portion after marking. FIG. 11 is a perspective explanatory view showing a raised portion stamped on the peripheral region. FIG. 12 is a longitudinal cross-sectional explanatory view showing a state immediately before the raised portion is separated from the metal plate. FIG. 13 is a longitudinal cross-sectional explanatory view showing a state immediately after the raised portion is cut off from the metal plate. FIG. 14 is a perspective explanatory view showing a raised portion separated from the metal plate before the marking step. FIG. 15 is an explanatory longitudinal cross-sectional view showing a state immediately before marking on the peripheral region of the raised portion previously cut from the metal plate. FIG. 16 is a longitudinal cross-sectional explanatory view showing a raised portion that becomes a button surface member according to another embodiment of the present invention. FIG. 17 is a longitudinal cross-sectional explanatory view showing a state immediately before marking on the peripheral region of the raised portion of FIG. FIG. 18 is a longitudinal cross-sectional explanatory view showing a state at the time of marking with respect to the peripheral region of the raised portion of FIG. FIG. 19 is a longitudinal cross-sectional explanatory view showing a state in which the outer die punch and the inner die are separated after marking on the peripheral region of the raised portion of FIG. FIG. 20 is an enlarged perspective view illustrating another example of the convex portion of the outer die punch. FIG. 21 is an enlarged perspective view illustrating another example of the concave portion of the inner die. FIG. 22 is an enlarged perspective explanatory view showing still another example of the convex portion of the outer die punch. FIG. 23 is an enlarged perspective explanatory view showing still another example of the concave portion of the inner die. FIG. 24 is a longitudinal sectional explanatory view schematically showing a button to which a button surface member of FIG. 1 or the like is added as an embodiment of the button according to the present invention. FIG. 25 is a longitudinal sectional explanatory view schematically showing another button to which the button surface member of FIG. 1 or the like is added, as another embodiment of the button according to the present invention. FIG. 26 is a longitudinal sectional explanatory view schematically showing a button to which a button surface member formed from a raised portion in FIG. 16 and the like is added as still another embodiment of the button according to the present invention.

  Preferred embodiments of the present invention will be described below with reference to the drawings. 1, 4, 7, 8, 10, 11, 14, 15, 16 to 19, etc., are shown upside down for the convenience of explanation. FIG. 1 is a perspective explanatory view schematically showing a button surface member (hereinafter also simply referred to as “surface member”) 10 according to an embodiment of the present invention and a metal plate 1 in a state in which the surface member 10 is separated. . The surface member 10 is formed from the metal plate 1 and is added to the heads of the buttons 100 and 120 (see FIGS. 24 and 25) for decoration and reinforcement. A longitudinal section of the surface member 10 is shown in FIG. The surface member 10 has a disc portion 11 and an axial direction (referred to as a direction along the axis of the disc portion 11) that is substantially perpendicular to the disc portion 11 from the periphery of the disc portion 11 (upper and lower are based on FIG. 13). Is a relative side). The length (height) in the axial direction of the circumferential side portion 12 from the disc portion 11 is about a fraction of the diameter of the disc portion 11, and thus the surface member 10 has a shallow circular cup shape. . The peripheral side portion 12 of the surface member 10 is provided with inscriptions 13 such as characters, symbols, figures, patterns, combinations thereof, etc. for decoration and management. In this embodiment, the inscription 13 is used for convenience of explanation. Is represented by the letter “A”. Hereinafter, the same reference number 13 as the stamp 13 may be used for the letter A. Four characters A13 are provided on the circumferential side portion 12 at intervals of 90 degrees in the circumferential direction. Although not shown, any decorative design or the like can be formed on the disc portion 11 of the surface member 10.

  Next, a process of obtaining the button surface member 10 from the metal plate 1 will be described as a button surface member forming method according to an embodiment of the present invention. First, as shown in FIGS. 2 and 3, a cylindrical punch 20 is pressed against the unprocessed metal plate 1 to squeeze out a shallow circular cup-shaped raised portion 10 ′ that protrudes downward from the metal plate 1. The raised portion 10 ′ has a disc region 11 ′ and a circumferential region 12 ′ corresponding to the disc portion 11 and the circumferential side portion 12 of the surface member 10, respectively. The height at which the raised portion 10 ′ rises from the lower surface of the metal plate 1 (the surface of the upper metal plate 1 in FIG. 3) is the same as the height (axial length) of the surface member 10. The inner diameter of 10 ′ is the same as the inner diameter of the surface member 10.

  Next, the letter A13 is engraved on the peripheral region 12 'of the raised portion 10'. FIG. 4 shows an outer die punch (hereinafter also simply referred to as “outer die”) 30 that presses against the circumferential region 12 ′ of the raised portion 10 ′ from the radially outer side of the raised portion 10 ′, and a radially inner side of the circumferential side region 12 ′. FIG. 6 is a perspective explanatory view schematically showing an inner die 40 that receives the outer die 30. Four outer dies 30 are arranged at intervals of 90 degrees in the circumferential direction with respect to the circumferential region 12 ′, and are formed in an A-shape enlarged in FIG. 5 at the circumferential center of the press surface 31 that is an end surface facing radially inward. Convex portion 32 is provided. The press surface 31 has a circumferential length corresponding to ¼ of the outer periphery of the circumferential region 12 ′ (see FIG. 9), and the outer circumferential surface 12′a (see FIG. 7 and the like) of the circumferential region 12 ′. Have a matching radius of curvature. The inner die 40 has a shape obtained by dividing a cylindrical body into four parts at intervals of 90 degrees in the circumferential direction, and is shown in an enlarged view in FIG. 6 at the upper circumferential center of the receiving surface 41 that is the outer circumferential surface of the inner die 40 It has a letter-shaped recess 42. The recess 42 of the inner die 40 substantially coincides with the protrusion 32 of the outer die 30. The receiving surface 41 of the inner die 40 has a radius of curvature that matches the inner peripheral surface 12′b (see FIG. 7 and the like) of the peripheral region 12 ′ of the raised portion 10 ′, and the circumferential length of the receiving surface 41 The length is slightly shorter than ¼ of the outer periphery of the peripheral region 12 ′ (see FIG. 9).

  When engraved on the peripheral region 12 ′ of the raised portion 10 ′, the inner die 40 has its upper surface in contact with the back surface of the disc region 11 ′ of the raised portion 10 ′ and each outer die 30 as shown in FIG. Are arranged so as to be aligned in the radial direction (actually, it is upside down from FIG. 7). From the state of FIG. 7, the outer die 30 is moved radially inward and the inner die 40 is moved radially outward to press the former press surface 41 against the outer peripheral surface 12′a of the peripheral region 12 ′ of the raised portion 10 ′. The inner peripheral surface 12 ′ b of the peripheral region 12 ′ is received by the receiving surface 41 of the inner die 40. As a result, as shown in FIGS. 8 and 9, the convex portion 32 of the outer die 30 dents the outer peripheral surface 12 ′ a of the peripheral region 12 ′ in an A shape radially inward (depression 13 a). An inner peripheral surface 12 ′ b of the peripheral side region 12 ′ protrudes in an A shape radially inward (protrusion 13 b), and the protrusion 13 b is received by the concave portion 42 of the inner die 40. In this way, by using the outer die 30 having the convex portion 32 and the inner die 40 having the concave portion 42 with respect to the peripheral region 12 ′ of the raised portion 10 ′, the character A13 including the recess 13a and the protruding portion 13b is clarified. Can be stamped. FIG. 10 shows a state in which the outer die 30 and the inner die 40 are separated from the circumferential region 12 ′ after engraving. FIG. 11 shows a raised portion 10 'in which the letter A13 is engraved on the peripheral region 12'.

  Next, the raised portion 10 ′ is separated from the metal plate 1. At this time, as shown in FIG. 12, a cylindrical support die 50 having an inner diameter that matches the outer diameter of the raised portion 10 ′ is used, and the raised portion 10 ′ is put into the hollow portion 52 of the support die 50, so that the raised portion 10 'The surrounding metal plate 1 is supported by the upper surface 51 of the support die 50. In this way, by lowering the cylindrical punch 60 having the same diameter as the outer diameter of the raised portion 10 ′ with respect to the raised portion 10 ′ supported by the support die 50, concentrically with the raised portion 10 ′, As shown in FIG. 13, the raised portion 10 ′ is sheared and separated from the metal plate 1. Thereby, the button surface member 10 shown in FIG. 1 is obtained.

  In the above description, the raised portion 10 ′ is separated from the metal plate 1 after forming the stamp 13 on the peripheral region 12 ′ of the raised portion 10 ′ (which is the same as the stamp 13 in FIG. As an example, as shown in FIG. 14, after separating the raised portion 10 ″ from the metal plate 1 (which is the same as the metal plate 1 in FIG. Thus, the peripheral region 12 ″ of the raised portion 10 ″ can also be marked using the outer die punch 30 and the inner die 40 described above. Note that the reference numeral 11 ″ represents the disc region of the raised portion 10 ″.

  Although the diameter of the peripheral side portion 12 (the peripheral side region 12 ′) of the button surface member 10 is substantially constant, the diameter of the peripheral side portion may not be constant, and an example will be described below. FIG. 16 is a longitudinal sectional view showing a state in which a raised portion 70 ′ that becomes a button surface member 70 (see FIG. 26) according to another embodiment of the present invention is squeezed out from the metal plate 2. The raised portion 70 ′ has a disc region 71 ′ and a circumferential region 72 ′ that extends downward in the axial direction from the periphery of the disc region 71 ′. The circumferential side region 72 ′ has an inclined portion 72′A whose diameter gradually increases downward in the upper half, and a lower half vertical portion 72 extending substantially parallel to the axis from the lower end of the inclined portion 72′A to the metal plate 2. Including 'B'. The raised portion 70 ′ is formed from the metal plate 2 by a punch (not shown) having a tip portion that is shaped to match the raised portion 70 ′. The marking process for the peripheral region 72 ′ of the raised portion 70 ′ is basically the same as that for the peripheral region 12 ′ of the raised portion 10 ′ described above, except for the following points. That is, the end surface facing the radially inner side of the outer die punch 80 becomes a receiving surface 81 having a concave portion 82, the outer peripheral surface of the inner die 90 becomes a press surface 91 having a convex portion 92, the receiving surface 81 of the outer die 80, and The concave portion 82 and the press surface 91 and the convex portion 92 of the inner die 90 are formed so as to correspond to the inclined portion 72′A and the vertical portion 72′B of the circumferential region 72 ′.

  FIG. 17 shows a state immediately before the outer die 80 and the inner die 90 are engraved on the peripheral region 72 ′ of the raised portion 70 ′. The receiving surface 81 of the outer die 80 has an inclined surface 81A and a vertical surface 81B that match the inclined portion 72′A and the vertical portion 72′B of the circumferential region 72 ′, and a recess is formed across the inclined surface 81A and the vertical surface 81B. 82 is provided. The inner die 90 also has an inclined surface 91A and a vertical surface 91B that match the inclined portion 72′A and the vertical portion 72′B of the peripheral region 72 ′, and a convex portion 92 is provided over the inclined surface 91A and the vertical surface 91B. . FIG. 18 shows a state in which a stamp 73 is formed in the peripheral region 72 ′ by the concave portion 82 of the outer die 80 and the convex portion 92 of the inner die 90. The stamp 73 includes a protrusion 73a that protrudes radially outward from the outer peripheral surface 72'a of the peripheral region 72 ', and a recess 73b that is recessed radially outward from the inner peripheral surface 72'b. FIG. 19 shows a state in which the outer die 80 and the inner die 90 are separated from the peripheral region 72 ′ after marking. Thereafter, the button surface member 70 (see FIG. 26) is obtained by separating the raised portion 70 ′ from the metal plate 2. Note that the raised portion 70 ′ may be first engraved on the raised portion 70 ′ after being separated from the metal plate 2.

  20 to 23 are other examples of convex portions and concave portions provided on the outer die (or inner die) and the inner die (or outer die). In FIGS. 20 and 21, convex portions 32 ′ having a number “12” shape are provided. A concave portion 42 ′ is illustrated, and in FIGS. 22 and 23, a heart-shaped convex portion 32 ″ and a concave portion 42 ″ are illustrated. In addition, the form of a stamp is not limited to these.

  FIG. 24 is a longitudinal sectional view schematically showing a button to which the above-described button surface member 10 is added as an embodiment of the button according to the present invention. The button 100 is of a type that is inserted into and removed from a button hole (not shown), and includes a button body 101 made of a substantially cylindrical resin. The button main body 101 has a central hole 102 penetrating along the axis, and is divided into a lower trunk portion 101a and a head portion 101b whose outer diameter expands stepwise from the upper end of the trunk portion 101a. The button surface member 10 is crimped to the head 101b of the button main body 101 so as to cover the surface (upper surface) and the peripheral side surface, and the center hole 102 cannot be seen from the surface side while decorating the head 101b of the button 100. Like that. Reference numeral 110 is a stopper for fixing the button 100 to the fabric t. The stopper 110 has a disk-shaped base portion 111 and a post portion 112 that protrudes concentrically with the base portion 111 from the base portion 111, and the post portion 112 penetrating the fabric t is a center hole of the button body 101. By engaging with 102, the button 100 is fixed to the fabric t.

FIG. 25 is a longitudinal sectional view schematically showing another button to which the button surface member 10 is added, as another embodiment of the button according to the present invention. The button 120 is of a type that is inserted into and removed from a button hole (not shown), and includes a substantially cylindrical button body 121. The button main body 121 includes an outer shell member 122 that is formed by drawing a metal plate and opens upward, and a metal core member 123 that is accommodated in the outer shell member 122. 121a and a head 121b whose outer diameter expands stepwise from the upper end of the body 121a. The outer diameter of the head 121b gradually increases upward, and therefore the peripheral side surface of the head 121b is inclined so as to expand upward. The button surface member 10 is crimped to the head 121b of the button main body 121 so as to cover the surface (upper surface) and the peripheral side surface, and the upper portion of the outer shell member 122 is opened while decorating and reinforcing the head 121b of the button 120. Block the part. The peripheral side portion 12 of the button surface member 10 is crimped so as to reduce the diameter downward along the inclined peripheral side surface of the button main body 121. Reference numeral 130 is a stopper for fixing the button 120 to the fabric t ′. The stopper 130 includes a disk-shaped base portion 131 and two protruding portions 132 protruding from the base portion 131. On the other hand, there is a gap between the bottom surface 124 of the outer shell member 122 of the button 120 and the bottom portion of the core member 123 to receive the protruding portion 132 of the stopper 130 that penetrates the fabric t ′ and then penetrates the bottom surface 124. Reference numeral 125 is two holes 125 formed by the protrusion 132 penetrating the bottom surface 124 of the outer shell member 122.
A concave curved surface 126 is provided at the bottom of the core member 123 for deforming the protruding portions 132 received in the gaps into curved shapes. Thus, the button 120 is fixed to the cloth t ′ by deforming the protruding portion 132 of the stopper 130 within the outer shell member 122.

  FIG. 26 is a longitudinal sectional view schematically showing a button to which a button surface member 70 formed from the above-described raised portion 70 ′ is added as yet another embodiment according to the present invention. Reference numeral 71 denotes a disk portion of the button surface member, and 72 denotes a circumferential side portion. The button 140 is of a type that is inserted into and removed from a buttonhole (not shown), and includes a substantially cylindrical button body 141 made of resin. The button main body 141 has a center hole 142 penetrating along the axis, and is divided into a lower body portion 141a and a head portion 141b whose outer diameter expands stepwise from the upper end of the body portion 141a. The button surface member 70 is crimped to the head portion 141b of the button main body 141 so as to cover the surface (upper surface) and the peripheral side surface, and the center hole 142 cannot be seen from the surface side while decorating the head portion 141b of the button 140. Like that. Reference numeral 150 is a stopper for fixing the button 140 to the fabric t ″. The stopper 150 includes a disk-shaped base portion 151 and a post portion that protrudes concentrically with the base portion 151 from the base portion 151. 152, and the post portion 152 penetrating the fabric t ″ engages with the center hole 142 of the button body 141, whereby the button 140 is fixed to the fabric t ″.

1, 2 Metal plate 10, 70 Button surface member 10 ', 10 ", 70' Raised portion 11, 71 Disc portion 11 ', 11", 71' Disc region 12, 72 Circumferential side portion 12 ', 12 ", 72 'Circumferential area 13, 73 Mark 13a, 73b Depression 13b, 73a Protrusion 30, 80 Outer die punch 32, 32', 32 ", 92 Convex 40, 90 Inner die 42, 42 ', 42", 82 Concave 100 , 120, 140 Button 101, 121, 141 Button body

Claims (2)

A circular cup-shaped metallic button surface member (11, 71) and an annular peripheral side portion (12, 72) extending in the axial direction from the periphery of the disk portion (11, 71). 10, 70), comprising:
From the metal plates (1, 2), the disc regions (11 ′, 11 ″, 71) corresponding to the disc portions (11, 71) and the peripheral side portions (12, 72) of the button surface members (10, 70). ') And squeezing the ridges (10', 10 ", 70 ') having the circumferential regions (12', 12", 72 ');
Separating the raised portions (10 ′, 10 ″, 70 ′) from the metal plates (1, 2);
Before or after the disconnecting step, the raised portions (10 ', 10', 70 ') of the peripheral region (12', 12 ', 72') looking contains a step of marking, the
In the marking step, the outer die (30, 80) moves radially inward, and the end face (31, 81) facing the radially inner side of the outer die (30, 80) is formed on the button surface member (10, 70). Press against the outer peripheral surface (12′a, 72′a) of the peripheral region (12 ′, 12 ″, 72 ′), the inner die (40, 90) moves radially outward, and the inner die (40, 90) the outer peripheral surface (41, 91) of the button surface member (10, 70) against the inner peripheral surface (12′b, 72′b) of the peripheral region (12 ′, 12 ″, 72 ′),
The button surface member forming method in which the outer die (30, 80) and the inner die (40, 90) are separated from the peripheral region (12 ′, 12 ″, 72 ′) after the marking step . The step of marking includes convex portions (32, 32 ′, 32 ″, 92) having a shape corresponding to the marking from the radially outer side with respect to the peripheral region (12 ′, 12 ″, 72 ′) of the raised portion or An outer die ( 30 , 80) having a concave portion (42, 42 ′, 42 ″, 82) on an end face (31, 81) facing the radially inner side is provided with the convex portion (32, 32 ′, 32) from the radially inner side. "92) or recess (42, 42 ', 42", concave shape that matches the 82) (42, 42', 42 ", 82) or projections (32, 32 ', 32", 92) the The button surface member formation method of Claim 1 performed by applying the inner side die (40 , 90) which has on an outer peripheral surface (41, 91), respectively.

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