Punching nut

Abstract

A punching nut is provided with: a main body part; a terrace-shaped part which is provided near the center of the flat surface of the main body part and is formed in a thin plate shape; and a pilot part protruding in the extending direction from the vicinity of the center of a stepped surface provided on the terrace-shaped part. The step surface of the terrace-shaped part is formed to protrude from the flat surface; the outer peripheral surface of the pilot part and the stepped surface of the terrace-shaped part are connected at a neck part between the terrace-shaped part and the pilot part, so that a gap is formed near the neck part; the first cross-sectional shape of the pilot section is an n-side shape (where n is a natural number of 4 or more) on a first intersecting surface intersecting the direction of extension.

Description

Technical Field

[0001] The invention relates to a pierce nut. Background Art

[0002] Conventionally, there is known a pierce nut having a groove formed on the outer peripheral surface of a pilot portion (for example, Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent No. 5300027 Summary of the invention

[0006] Problem that the invention aims to solve

[0007] Here, in the pierce nut of Patent Document 1, the groove provided on the outer peripheral surface of the pilot portion mainly serves to exert pull-out resistance and rotation resistance on the pierce nut fixed to the metal plate.

[0008] However, in order to manufacture a piercing nut having such a groove, a die having a complicated shape needs to be prepared. As a result, the die is frequently damaged when manufacturing the piercing nut, which results in a problem of increased manufacturing cost.

[0009] Therefore, an object of the present invention is to provide a pierce nut that can be satisfactorily fixed to a plate material even when a simple shape is adopted.

[0010] Means used to solve problems

[0011] In order to solve the above-mentioned problems, the piercing nut involved in the first mode is characterized in that it has: a main body; a terrace-shaped portion, which is arranged near the center of the flat surface of the main body and is formed in the shape of a thin plate; and a guide portion, which protrudes from the center of the step surface arranged on the terrace-shaped portion toward the extension direction; the step surface of the terrace-shaped portion is formed to bulge from the flat surface; the outer peripheral surface of the guide portion and the step surface of the terrace-shaped portion are connected to the neck between the terrace-shaped portion and the guide portion, so as to form a gap near the neck; on the first intersection surface intersecting the extension direction, the first cross-sectional shape of the guide portion is an n-sided shape (wherein n is a natural number greater than 4); on the first intersection surface intersecting the extension direction On the second intersection surface, the second cross-sectional shape of the terrace-shaped portion is an m-sided shape (wherein m is a natural number greater than 5 and different from n); and the length of the outer peripheral line of the leading portion on the first intersection surface increases as the first intersection surface moves away from the step surface to the top end surface side of the leading portion; the intersection point of a ray extending from the axis of the leading portion along the step surface and the outer peripheral surface is defined as a first intersection point, the intersection point of the ray with the outermost periphery of the step surface is defined as a second intersection point, and the length of the line segment connecting the first intersection point and the second intersection point is defined as a gap length, and on this basis, when the rotation position of the ray changes around the axis, the gap length at each rotation position changes.

[0012] In addition, the piercing nut involved in the second embodiment is characterized in that it comprises: a main body; a terrace-shaped portion, which is arranged near the center of the flat surface of the main body and is formed in a thin plate shape; and a guide portion, which protrudes from the center of the step surface arranged on the terrace-shaped portion in the extension direction; the step surface of the terrace-shaped portion is formed to bulge from the flat surface; the outer peripheral surface formed on the guide portion and the step surface of the terrace-shaped portion are connected to the neck between the terrace-shaped portion and the guide portion, so that a gap is formed near the neck; on a first intersection surface intersecting the extension direction, the first cross-sectional shape of the guide portion is an n-sided shape (where n is a natural number greater than 4); on a second intersection surface intersecting the extension direction, the second cross-sectional shape of the terrace-shaped portion is an m-sided shape shape (wherein m is a natural number greater than 5 and different from n); and the length of the outer circumference of the guide portion on the first intersection surface increases as the first intersection surface moves away from the step surface to the top end surface side of the guide portion; the intersection of a ray extending from the axis of the guide portion along the step surface and the outer circumference is defined as a first intersection, the intersection of the ray and the outermost circumference of the step surface is defined as a second intersection, the length of the line segment connecting the first intersection and the second intersection is defined as a gap length, and the length of the line segment connecting the axis and the first intersection is defined as a guide diameter, on this basis, when the rotational position of the ray changes around the axis, the gap length and the guide diameter at each rotational position change, and the position of the gap corresponding to each rotational position changes.

[0013] In addition, the piercing nut involved in the third embodiment is characterized in that it has: a main body; a terrace-shaped portion, which is provided near the center of the flat surface in the main body and is formed in a thin plate shape; and a pilot portion, which protrudes from the center of the step surface provided in the terrace-shaped portion in the extension direction; the step surface of the terrace-shaped portion is formed to bulge from the flat surface; the outer peripheral surface of the pilot portion and the step surface of the terrace-shaped portion are connected at a neck between the terrace-shaped portion and the pilot portion, so that a gap is formed near the neck; on a first intersection surface intersecting the extension direction, the first cross-sectional shape of the pilot portion is an n-sided shape (where n is a natural number greater than 4); on a second intersection surface intersecting the extension direction, the second cross-sectional shape of the terrace-shaped portion is an m-sided shape (where m is a natural number greater than 5 and different from n); and the length of the outer peripheral line of the pilot portion on the first intersection surface increases as the first intersection surface moves away from the step surface to the top end surface side of the pilot portion; the third cross-sectional shape of the pilot portion intersecting the step surface is surrounded by the outermost periphery of the step surface.

[0014] In addition, the piercing nut involved in the fourth aspect is characterized in that, in the piercing nut involved in any one of the first to third aspects, the inclination angle formed by the outer peripheral surface and the step surface on the cross section including the axis of the pilot portion is 65 to 80 degrees.

[0015] In addition, a piercing nut according to a fifth aspect is characterized in that, in the piercing nut according to any one of the first to fourth aspects, the following formula (C1) is satisfied:

[0016] m=2n(C1).

[0017] Effects of the Invention

[0018] In the piercing nut according to any one of the first to fifth aspects, the first cross-sectional shape of the pilot portion is an n-sided shape (where n is a natural number greater than or equal to 4) on a first intersecting surface intersecting the extending direction. In addition, the second cross-sectional shape of the terrace-shaped portion is an m-sided shape (where m is a natural number greater than or equal to 5 and different from n) on a second intersecting surface intersecting the extending direction.

[0019] Thus, when the rotation position of the ray extending from the axis of the pilot portion along the step surface changes around the axis, the gap length at each rotation position can be changed. Therefore, it is not necessary to form a complex shape such as concave and convex on the outer peripheral surface of the pilot portion, and the rotation resistance and pull-out resistance of the piercing nut fixed to the plate can be improved.

[0020] In particular, according to the piercing nut involved in the fourth embodiment, the inclination angle between the outer peripheral surface and the stepped surface is 65 to 80 degrees in the cross section including the axis of the pilot portion. As a result, a gap (recess) that can well guide the plate can be formed in the neck between the terrace-shaped portion and the pilot portion. Therefore, the rotation resistance and pull-out resistance of the piercing nut fixed to the plate can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a perspective view showing an example of the structure of the pierce nut in the first embodiment of the present invention.

[0022] Figure 2 It is a front view which shows an example of the structure of the pierce nut in the first embodiment of the present invention.

[0023] Figure 3 It is a plan view showing an example of the structure of the pierce nut in the first to third embodiments of the present invention.

[0024] Figure 4 It is a bottom view showing an example of the structure of the pierce nut in the first embodiment of the present invention.

[0025] Figure 5 It means from Figure 2 A cross-sectional view of an example of the structure of a pierce nut observed along line AA.

[0026] Figure 6 It means respectively from Figure 2 The BB line and Fig.17 This is a cross-sectional view of an example of the structure of a pierce nut observed along line HH.

[0027] Figure 7 It means from Figure 3 This is a cross-sectional view of an example of the structure of a pierce nut observed along line CC.

[0028] Figure 8 It means from Figure 5 This is a cross-sectional view of an example of the structure of a pierce nut observed along line DD.

[0029] Fig. 9 This is a diagram for explaining a method of fixing a pierce nut.

[0030] Fig.10 This is a diagram for explaining a method of fixing a pierce nut.

[0031] Fig.11 It is a perspective view showing an example of the structure of a pierce nut in the second embodiment of the present invention.

[0032] Fig.12 It is a front view which shows an example of the structure of the pierce nut in the second embodiment of the present invention.

[0033] Fig.13 It is a bottom view showing an example of the structure of the pierce nut in the second embodiment of the present invention.

[0034] Fig.14 It means from Fig.12 A cross-sectional view of an example of the structure of a pierce nut observed along line EE.

[0035] Fig.15 It means from Fig.12 This is a cross-sectional view of an example of the structure of a pierce nut observed along line FF.

[0036] Fig.16 It is a perspective view showing an example of the structure of a pierce nut in a third embodiment of the present invention.

[0037] Fig.17 It is a front view which shows an example of the structure of the pierce nut in the third embodiment of the present invention.

[0038] Fig.18 It is a bottom view showing an example of the structure of a pierce nut in a third embodiment of the present invention.

[0039] Fig.19 It means from Fig.17 A cross-sectional view of an example of the structure of a pierce nut observed along line GG. DETAILED DESCRIPTION

[0040] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0041] <1. First Embodiment>

[0042] <1.1. Structure of piercing nut>

[0043] Figures 1 to 4 A perspective view, a front view, a top view, and a bottom view respectively show an example of the structure of the pierce nut 10 in the first embodiment of the present invention. Figure 5 It means from Figure 2 A cross-sectional view of an example of the structure of the pierce nut 10 as viewed along line AA. Figure 6 It means from Figure 2 A cross-sectional view of an example of the structure of the pierce nut 10 viewed along line BB. Figure 7 It means from Figure 3 A cross-sectional view of an example of the structure of the pierce nut 10 as viewed along line CC. Figure 8 It means from Figure 5 This is a cross-sectional view of an example of the structure of the pierce nut 10 as viewed along line DD.

[0044] Among them, the piercing nut 10 is a nut that is fixed to a plate such as a steel plate by applying pressure. Figures 1 to 8 As shown, the pierce nut 10 mainly includes a body portion 20 , a pilot portion 30 and a terrace portion 50 .

[0045] In addition, Figure 1 In the following drawings, in order to facilitate understanding of the components described in the drawings, an XYZ orthogonal coordinate system with the Z-axis direction as the vertical direction and the XY plane as the horizontal plane is appropriately indicated as needed.

[0046] The main body 20 is a substantially rectangular parallelepiped having a through hole 21 formed therein. Figure 3 As shown in FIG. 1 , the main body 20 is roughly square in shape when viewed from above. Figure 7 and Figure 8 As shown, the through hole 21 formed in the main body 20 extends in the direction of the axis 30 a of the pilot portion 30 and is used as a threaded hole.

[0047] The pilot part 30 is a tool that can make a hole in a metal plate such as a steel plate by applying pressure along the axis 30a. Figure 1 and Figure 2As shown, the guide portion 30 protrudes from the center of the step surface 51 provided on the terrace-shaped portion 50 in the direction of the arrow AR1 (hereinafter, the direction parallel to the arrow AR1 (Z axis) and the axis 30a is also referred to as the "extension direction AR1"). Figure 1 , Figure 7 and Figure 8 As shown, a through hole 21 is formed in the center of the pilot portion 30 similarly to the main body portion 20 .

[0048] In addition, if Figure 1 , Figure 2 as well as Figure 4 As shown in FIG. 1 , the pilot portion 30 has a quadrangular pyramidal shape protruding toward the outside of the main body 20. Figure 5 As shown, on the first intersecting plane PL11 intersecting the extending direction AR1, the cross-sectional shape (first cross-sectional shape) of the pilot portion 30 is a quadrilateral shape. Figure 5 The two-dot chain line in FIG. 1 represents the top end surface 36 of the leading portion 30 when viewed from above (see FIG. 1 ). Figure 4 ) outline.

[0049] Moreover, if Figure 1 and Figure 2 As shown, the direction intersecting with the extending direction AR1 (for example, Figure 5 The outer peripheral length of the pilot portion 30 in the direction parallel to the first intersecting plane PL11 (in the direction parallel to the first intersecting plane PL11) increases as it moves away from the step surface 51 toward the top end surface 36 side of the pilot portion 30.

[0050] The terrace portion 50 is thinner than the main body 20 and is provided near the center of the flat surface 23 of the main body 20. Figure 1 and Figure 2 As shown in FIG. 1 , the step surface 51 constituting the main surface of the terrace-shaped portion 50 is formed so as to be raised from the flat surface 23 of the main body portion 20. Figure 7 and Figure 8 As shown, a through hole 21 is formed in the center of the terrace portion 50 , similarly to the main body portion 20 and the pilot portion 30 .

[0051] In addition, if Figure 1 and Figure 2 As shown in FIG. 1 , the terrace portion 50 is formed so as to surround the end portion (neck portion 15) of the pilot portion 30 on the flat surface 23 side. More specifically, as shown in FIG. Figure 5 As shown, the cross-sectional shape (third cross-sectional shape) of the pilot portion 30 intersecting the step surface 51 in the first intersection plane PL11 is surrounded by the outermost periphery 51 a of the step surface 51 .

[0052] In this way, the outer peripheral surface 32 of the pilot portion 30 and the step surface 51 of the terrace 50 are connected at the neck 15 between the terrace 50 and the pilot portion 30 , thereby forming the gap 16 near the neck 15 .

[0053] In addition, if Figure 2 As shown in FIG. 1 , the step surface 51 is formed to be parallel to the flat surface 23 of the main body 20. Figure 6 As shown, on the second intersecting plane PL12 intersecting the extending direction AR1, the cross-sectional shape (second cross-sectional shape) of the terrace portion 50 cut by the second intersecting plane PL12 is an octagonal shape.

[0054] Moreover, if Figure 7 and Figure 8 As shown, on the cross section including the axis 30a of the pilot portion 30 (ie, Figure 7 and Figure 8 The inclined angle A1 formed by the outer peripheral surface 32 of the pilot portion 30 and the step surface 51 of the terrace-shaped portion 50 is 65 to 80 degrees (preferably 70 to 75 degrees).

[0055] <1.2. Gap length at each rotation position>

[0056] Here, refer to Figure 5 , Figure 7 and Figure 8 , for each rotation position (for example, Figure 5 How the gap length 75 (75a to 75g) changes at the angles 76a, 76b) will be described.

[0057] Among them, Figure 5 As shown:

[0058] (1) The intersection of a ray 70 ( 70 a to 70 g ) extending from the axis 30 a of the pilot portion 30 along the step surface 51 and the outer peripheral surface 32 of the pilot portion 30 is defined as a first intersection 71 ( 71 a to 71 g ),

[0059] (2) The intersection of the ray 70 (70a to 70g) and the outermost periphery 51a of the step surface 51 is defined as the second intersection 72 (72a to 72g),

[0060] (3) The length of the line segment connecting the first intersection point 71 (71a to 71g) and the corresponding second intersection point 72 (72a to 72g) is defined as the gap length 75 (75a to 75g),

[0061] (4) The length of the line segment connecting the axis 30a and the first intersection point 71 (71a to 71g) is defined as the pilot diameter.

[0062] (5) Regarding the rotational position (angle) around the axis 30a, a ray serving as a reference for the rotational position is defined as a ray 70a.

[0063] In this case, each ray 70 (70a to 70g) extends radially from the axis 30a. When the rotational position of each ray 70 (70a to 70g) changes around the axis 30a, the gap length 75 (75a to 75g) at each rotational position changes.

[0064] For example, Figure 5 As shown, when gap length 75c on ray 70c having a rotational position of angle 76a (i.e., the angle formed by ray 70a and ray 70c) is compared with gap length 75d on ray 70d having a rotational position of angle 76b, the size of gap length 75 decreases when the rotational position changes from angle 76a to angle 76b.

[0065] In addition, if the gap length 75 (75a to 75g) at each rotation position is studied from another point of view, it is as follows. That is, when the rotation position of each ray 70 (70a to 70g) changes around the axis 30a, the gap length 75 (75a to 75g) at each rotation position and the pilot diameter change (refer to Figure 5 ), and the position of the gap 16 corresponding to each rotation position changes (refer to Figure 7 and Figure 8 ).

[0066] <1.3. Fixing method of piercing nut>

[0067] Fig. 9 and Fig.10 Each of the figures is used to explain a method of riveting the piercing nut 10 to a plate material 1 such as a steel plate (a method of fixing the piercing nut 10). Fig.10 In FIG. 1 , the plate 1 , the die 5 , the blanking material 7 , and the pierce nut 10 are each shown in a cross-sectional shape including the axis 30 a .

[0068] The fixing of the piercing nut 10 is performed by the following steps. First, the piercing nut 10 and the plate 1 are arranged between the punch 3 and the die 5, and pressure is applied to the piercing nut 10 and the plate 1 from the punch 3 and the die 5. As a result, a part of the plate 1 is removed as a punching waste 7, and a hole is opened in the plate 1.

[0069] When the pressure is further continuously applied, a part of the plate 1 is introduced into the gap 16 formed by the outer peripheral surface 32 of the pilot portion 30 and the stepped surface 51 of the terraced portion 50. As a result, the plate 1 and the pierce nut 10 are riveted together, and the pierce nut 10 is firmly fixed to the plate 1. In this way, the arrangement of the pilot portion 30 and the terraced portion 50 becomes an important factor in the fixing condition of the left and right pierce nuts 10.

[0070] <1.4. Advantages of the pierce nut of the first embodiment>

[0071] As described above, according to the pierce nut 10 of the first embodiment, the cross-sectional shape (first cross-sectional shape) of the pilot portion 30 is a quadrilateral shape on the first intersecting plane PL11 intersecting the extending direction AR1 (see Figure 5 ). In addition, on the second intersecting plane PL12 intersecting the extending direction AR1, the cross-sectional shape (second cross-sectional shape) of the terrace portion 50 is an octagonal shape.

[0072] Thus, when the rotational position of the ray 70 (70a to 70g) extending from the axis 30a of the pilot portion 30 along the step surface 51 is changed around the axis 30a, the gap length 75 (75a to 75g) at each rotational position can be changed. Therefore, it is not necessary to form a complex shape such as concave and convex on the outer peripheral surface 32 of the pilot portion 30, and the rotation resistance and pull-out resistance of the piercing nut fixed to the plate can be improved.

[0073] According to the piercing nut 10 of the first embodiment, in the cross section including the axis 30a of the pilot portion 30, the outer peripheral surface 32 of the pilot portion 30 and the stepped surface 51 of the terraced portion 50 form an inclination angle A1 (see Figure 7 as well as Figure 8 ) is 65 to 80 degrees (preferably 70 to 75 degrees).

[0074] Thus, the gap 16 (recessed portion) capable of well guiding the plate 1 can be formed in the neck portion 15 between the terrace portion 50 and the pilot portion 30. Therefore, the rotation resistance and the pull-out resistance of the pierce nut 10 fixed to the plate 1 can be further improved.

[0075] <2. Second Embodiment>

[0076] Next, a second embodiment of the present invention will be described. The pierce nuts 10 and 110 of the first and second embodiments have the same structure except that the structures of the corresponding pilot portions 30 and 130 and terrace portions 50 and 150 are different. Therefore, the following description will focus on this difference.

[0077] In addition, the same reference numerals are attached to the same components in the pierce nuts 10 and 110, and the components attached with the same reference numerals have been described in the first embodiment. Therefore, the description is omitted in this embodiment.

[0078] <2.1. Structure of piercing nut>

[0079] Fig.11 , Fig.12 , Figure 3 as well as Fig.13 A perspective view, a front view, a top view, and a bottom view respectively show an example of the structure of the pierce nut 110 in the second embodiment of the present invention. Fig.14It means from Fig.12 A cross-sectional view of an example of the structure of the pierce nut 110 observed along line EE. Fig.15 It means from Fig.12 A cross-sectional view of an example of the structure of the pierce nut 110 observed along line FF.

[0080] The piercing nut 110 is similar to the piercing nut 10 and is a nut that is fixed to a plate such as a steel plate by applying pressure. Figures 11 to 15 as well as Figure 3 As shown, the pierce nut 110 mainly includes a body portion 20 , a pilot portion 130 and a terrace portion 150 .

[0081] The pilot part 130 is similar to the pilot part 30 of the first embodiment, and is a tool that can make a hole in a metal plate such as a steel plate by applying pressure along the axis 130a direction of the pilot part 130. Fig.11 and Fig.12 As shown in FIG. 1 , the guide portion 130 protrudes from the vicinity of the center of the step surface 151 provided on the terrace-shaped portion 150 in the extending direction AR1. Fig.11 As shown, a through hole 21 is formed at the center of the pilot portion 130 similarly to the pilot portion 30 of the first embodiment.

[0082] In addition, if Figures 11 to 13 As shown in FIG. 1 , the pilot portion 130 has a hexagonal pyramidal shape that protrudes toward the outside of the main body 20. Fig.14 As shown, on the first intersecting plane PL21 intersecting the extending direction AR1, the cross-sectional shape (first cross-sectional shape) of the leading portion 130 is a hexagonal shape. Fig.14 The double-dashed line in FIG. 1 represents the top end surface 136 of the leading portion 130 when viewed from above (see FIG. 14 ). Fig.13 ) outline.

[0083] Moreover, if Fig.11 and Fig.12 As shown, the direction intersecting with the extending direction AR1 (for example, Fig.14 The outer peripheral length of the pilot portion 130 in the direction parallel to the first intersecting plane PL21 (in the direction parallel to the first intersecting plane PL21) increases as it moves away from the step surface 151 toward the top end surface 136 side of the pilot portion 130.

[0084] The terrace portion 150 is thinner than the main body 20 and is provided near the center of the flat surface 23 of the main body 20. Fig.11 and Fig.12 As shown, a step surface 151 constituting a main surface of the terrace 150 is formed to rise from the flat surface 23 of the main body 20. In the center of the terrace 150, a through hole 21 is formed similarly to the terrace 50 of the first embodiment.

[0085] In addition, if Fig.11 and Fig.12 As shown in FIG. 1 , the terrace portion 150 is formed so as to surround the end portion (neck portion 115) of the pilot portion 30 on the flat surface 23 side. More specifically, as shown in FIG. Fig.14 As shown, the cross-sectional shape (third cross-sectional shape) of the pilot portion 130 intersecting the step surface 151 in the first intersection plane PL21 is surrounded by the outermost periphery 151 a of the step surface 151 .

[0086] In this way, the outer peripheral surface 132 of the pilot portion 130 and the stepped surface 151 of the terrace 150 are connected at the neck 115 between the terrace 150 and the pilot portion 130 , thereby forming a gap 116 near the neck 115 .

[0087] In addition, if Fig.12 As shown in FIG. 1 , the step surface 151 is formed to be parallel to the flat surface 23 of the main body 20. Fig.15 As shown, on the second intersecting plane PL22 intersecting the extending direction AR1, the cross-sectional shape (second cross-sectional shape) of the terrace-shaped portion 150 cut by the second intersecting plane PL22 is a dodecagon.

[0088] Furthermore, in the cross section including the axis 130a of the pilot portion 130, the outer peripheral surface 132 of the pilot portion 130 and the step surface 151 of the terrace-shaped portion 150 form an inclination angle A1 (see Fig.12 ) is 65 to 80 degrees (preferably 70 to 75 degrees).

[0089] <2.2. Gap length at each rotation position>

[0090] Here, refer to Fig.14 , for each rotation position (for example, Fig.14 How the gap length 175 (175a to 175g) changes at the angles 176a, 176b) will be described.

[0091] Among them, Fig.14 As shown:

[0092] (1) The intersection of a ray 170 (170a to 170g) extending from the axis 130a of the pilot portion 130 along the step surface 151 and the outer peripheral surface 132 of the pilot portion 130 is defined as a first intersection 171 (171a to 171g),

[0093] (2) The intersection of the ray 170 (170a to 170g) and the outermost periphery 151a of the step surface 151 is defined as a second intersection 172 (172a to 172g),

[0094] (3) The length of the line segment connecting the first intersection point 171 (171a to 171g) and the corresponding second intersection point 172 (172a to 172g) is defined as the gap length 175 (175a to 175g),

[0095] (4) The length of the line segment connecting the axis 130a and the first intersection point 171 (171a-171g) is defined as the pilot diameter.

[0096] (5) Regarding the rotational position (angle) around the axis 130a, a ray serving as a reference for the rotational position is defined as a ray 170a.

[0097] In this case, each ray 170 (170a-170g) extends radially from the axis 130a. In addition, when the rotational position of each ray 170 (170a-170g) changes around the axis 130a, the gap length 175 (175a-175g) at each rotational position changes.

[0098] For example, Fig.14 As shown, when the gap length 175b on ray 170b whose rotational position is angle 176a (i.e., the angle formed by ray 170a and ray 170b) is compared with the gap length 175c on ray 170c whose rotational position is angle 176b, the size of gap length 175 decreases when the rotational position changes from angle 176a to angle 176b.

[0099] In addition, if the gap length 175 (175a to 175g) at each rotation position is studied from another point of view, it is as follows. That is, when the rotation position of each ray 170 (170a to 170g) changes around the axis 130a, the gap length 175 (175a to 175g) at each rotation position and the pilot diameter change (refer to Fig.14 ), and the position of the gap 116 corresponding to each rotational position changes.

[0100] <2.3. Fixing method of piercing nut>

[0101] Fig. 9 and Fig.10 The figures are used to explain the method of riveting the piercing nut 110 to the plate material 1 such as a steel plate (the method of fixing the piercing nut 110). Fig.10 In FIG. 1 , the plate 1 , the die 5 , the blanking material 7 , and the pierce nut 110 are each shown as a cross-sectional shape of a cross section including the axis 130 a .

[0102] The fixing of the piercing nut 110 is performed by the following steps. First, on the basis of arranging the piercing nut 110 and the plate 1 between the punch 3 and the die 5, pressure is applied to the piercing nut 110 and the plate 1 from the punch 3 and the die 5. Then, a part of the plate 1 is removed as the blank 7, a hole is opened in the plate 1, and a part of the plate 1 is introduced into the gap 116 formed by the outer peripheral surface 132 of the pilot portion 130 and the step surface 151 of the terraced portion 150, so that the plate 1 and the piercing nut 110 are riveted, and the piercing nut 110 is firmly fixed to the plate 1.

[0103] As described above, similarly to the first embodiment, the arrangement of the pilot portion 130 and the terrace-shaped portion 150 is an important factor in the fixing condition of the left and right pierce nuts 110 .

[0104] <2.4. Advantages of the pierce nut of the second embodiment>

[0105] As described above, according to the pierce nut 110 of the second embodiment, the cross-sectional shape (first cross-sectional shape) of the pilot portion 130 on the first intersecting plane PL21 intersecting the extending direction AR1 is a hexagonal shape (see Fig.14 ). In addition, on the second intersecting plane PL22 intersecting the extending direction AR1, the cross-sectional shape (second cross-sectional shape) of the terrace portion 50 is a dodecagonal shape (refer to Fig.15 ).

[0106] Thus, when the rotational position of the ray 170 (170a to 170g) extending from the axis 130a of the pilot portion 130 along the step surface 151 is changed around the axis 130a, the gap length 175 (175a to 175g) at each rotational position can be changed. Therefore, it is not necessary to form a complex shape such as concave and convex on the outer peripheral surface 132 of the pilot portion 130, and the rotation resistance and pull-out resistance of the piercing nut fixed to the plate can be improved.

[0107] According to the piercing nut 110 of the second embodiment, in the cross section including the axis 130a of the pilot portion 130, the outer peripheral surface 132 of the pilot portion 130 and the stepped surface 151 of the terraced portion 150 form an inclination angle A1 (see Fig.12 ) is 65 to 80 degrees (preferably 70 to 75 degrees).

[0108] Thus, the gap 116 (recessed portion) capable of well guiding the plate 1 can be formed in the neck portion 115 between the terrace portion 150 and the pilot portion 130. Therefore, the rotation resistance and the pull-out resistance of the pierce nut 110 fixed to the plate 1 can be further improved.

[0109] <3. Third Embodiment>

[0110] Next, a third embodiment of the present invention will be described. A pierce nut 210 of the third embodiment mainly includes the body portion 20 and the terrace portion 50 of the first embodiment and the pilot portion 130 of the second embodiment.

[0111] The pierce nut 210 of the third embodiment has the same structure as that of the first and second embodiments except for the difference in the structure of the neck 215 and the gap 216. Therefore, the following description will focus on this difference.

[0112] In the pierce nut 210 , the same components as those included in the pierce nuts 10 and 110 are denoted by the same reference numerals, and the components denoted by the same reference numerals have been described in the first and second embodiments, and therefore, description thereof is omitted in this embodiment.

[0113] <3.1. Structure of piercing nut>

[0114] Fig.16 , Fig.17 , Figure 3 as well as Fig.18 A perspective view, a front view, a top view, and a bottom view respectively show an example of the structure of the pierce nut 210 in the third embodiment of the present invention. Fig.19 It means from Fig.17 A cross-sectional view of an example of the structure of the pierce nut 210 observed along the GG line. Figure 6 It means from Fig.17 A cross-sectional view of an example of the structure of the pierce nut 210 observed along the line HH.

[0115] The piercing nut 210 is similar to the piercing nuts 10 and 110 in that it is fixed to a plate such as a steel plate by applying pressure. Figures 16 to 19 , Figure 3 as well as Figure 6 As shown, the pierce nut 210 mainly includes a body portion 20 , a pilot portion 130 and a terrace portion 50 .

[0116] like Fig.16 and Fig.17 As shown in FIG. 1 , the pilot portion 130 protrudes from the center of the step surface 51 provided on the terrace-shaped portion 50 in the extension direction AR1. The terrace-shaped portion 50 is formed so as to surround the end portion (neck portion 215) of the pilot portion 130 on the flat surface 23 side. Fig.16 and Fig.17 As shown, the outer peripheral surface 132 of the pilot portion 130 and the step surface 51 of the terrace 50 are connected at the neck 215 between the terrace 50 and the pilot portion 130 , so that a gap 216 is formed near the neck 215 .

[0117] In the cross section including the axis 130a of the pilot portion 130, the outer peripheral surface 132 of the pilot portion 130 and the step surface 51 of the terrace portion 50 form an inclination angle A1 (see Fig.17 ) is 65 to 80 degrees (preferably 70 to 75 degrees). Fig.19 The double-dashed line in FIG. 1 represents the top end surface 136 of the leading portion 130 when viewed from above (see FIG. 14 ). Fig.18 ) outline.

[0118] <3.2. Gap length at each rotation position>

[0119] Here, refer to Fig.19 , for each rotation position (for example, Fig.19 How the gap length 275 (275a to 275g) changes at the angles 276a, 276b) will be described.

[0120] Among them, Fig.19 As shown:

[0121] (1) The intersection of a ray 270 (270a to 270g) extending from the axis 130a of the pilot portion 130 along the step surface 51 and the outer peripheral surface 132 of the pilot portion 130 is defined as a first intersection 271 (271a to 271g),

[0122] (2) The intersection of the ray 270 (270a to 270g) and the outermost periphery 51a of the step surface 51 is defined as a second intersection point 272 (272a to 272g),

[0123] (3) The length of the line segment connecting the first intersection point 271 (271a to 271g) and the corresponding second intersection point 272 (272a to 272g) is defined as the gap length 275 (275a to 275g),

[0124] (4) The length of the line segment connecting the axis 130a and the first intersection point 271 (271a-271g) is defined as the pilot diameter.

[0125] (5) Regarding the rotational position (angle) around the axis 130a, a ray serving as a reference for the rotational position is defined as a ray 270a.

[0126] In this case, each ray 270 (270a-270g) extends radially from the axis 130a. In addition, when the rotational position of each ray 270 (270a-270g) changes around the axis 130a, the gap length 275 (275a-275g) at each rotational position changes.

[0127] For example, Fig.19As shown, when the gap length 275c on the ray 270c whose rotation position is angle 276a (i.e., the angle formed by the ray 270a and the ray 270c) is compared with the gap length 275e on the ray 270e whose rotation position is angle 276b, the gap length 275e corresponding to the rotation position and angle 276b is greater than the gap length 275c corresponding to the angle 276a.

[0128] In addition, if the gap length 275 (275a to 275g) at each rotation position is studied from another point of view, it is as follows. That is, when the rotation position of each ray 270 (270a to 270g) changes around the axis 130a, the gap length 275 (275a to 275g) at each rotation position and the pilot diameter change (refer to Fig.19 ), and the position of the gap 216 corresponding to each rotational position changes.

[0129] <3.3. Fixing method of piercing nut>

[0130] Fig. 9 and Fig.10 Each of the figures is used to explain a method of riveting the piercing nut 210 to a plate material 1 such as a steel plate (a method of fixing the piercing nut 210). Fig.10 In FIG. 1 , the plate 1 , the punch 5 , the blank 7 , and the pierce nut 210 are each shown as a cross-sectional shape of a cross section including the axis 130 a .

[0131] The fixing of the piercing nut 210 is performed by the following steps. First, on the basis of arranging the piercing nut 210 and the plate 1 between the punch 3 and the die 5, pressure is applied to the piercing nut 210 and the plate 1 from the punch 3 and the die 5. Then, a part of the plate 1 is removed as the blank 7, a hole is opened in the plate 1, and a part of the plate 1 is introduced into the gap 216 formed by the outer peripheral surface 132 of the pilot portion 130 and the step surface 51 of the terraced portion 50, so that the plate 1 and the piercing nut 210 are riveted, and the piercing nut 210 is firmly fixed to the plate 1.

[0132] As described above, similarly to the first and second embodiments, the arrangement of the pilot portion 130 and the terrace-shaped portion 150 is an important factor in the fixing condition of the left and right pierce nuts 210 .

[0133] <3.4. Advantages of the pierce nut of the third embodiment>

[0134] As described above, according to the pierce nut 210 of the third embodiment, the cross-sectional shape (first cross-sectional shape) of the pilot portion 130 on the first intersecting plane PL21 intersecting the extending direction AR1 is a hexagonal shape (see Fig.19). In addition, on the second intersecting plane PL12 intersecting the extending direction AR1, the cross-sectional shape (second cross-sectional shape) of the terrace portion 50 is an octagonal shape (see Figure 6 ).

[0135] Thus, when the rotational position of the ray 270 (270a to 270g) extending from the axis 130a of the pilot portion 130 along the step surface 51 is changed around the axis 130a, the gap length 275 (275a to 275g) at each rotational position can be changed. Therefore, it is not necessary to form a complex shape such as concave and convex on the outer peripheral surface 132 of the pilot portion 130, and the rotation resistance and pull-out resistance of the piercing nut fixed to the plate can be improved.

[0136] According to the piercing nut 210 of the third embodiment, in the cross section including the axis 130a of the pilot portion 130, the outer peripheral surface 132 of the pilot portion 130 and the stepped surface 51 of the terraced portion 50 form an inclination angle A1 (see Fig.17 ) is 65 to 80 degrees (preferably 70 to 75 degrees).

[0137] Thus, a gap 216 (recessed portion) capable of well guiding the plate 1 can be formed in the neck portion 215 between the terrace portion 50 and the pilot portion 130. Therefore, the rotation resistance and the pull-out resistance of the pierce nut 110 fixed to the plate 1 can be further improved.

[0138] <4. Modifications>

[0139] As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, Various deformation|transformation is possible.

[0140] (1) In the first embodiment, the cross-sectional shape of the pilot portion 30 (first cross-sectional shape: see Figure 5 ) and the cross-sectional shape of the terrace portion 50 (second cross-sectional shape: refer to Figure 6 ) are respectively described as being line symmetrical with respect to the straight line passing through the ray 70a,

[0141] In the second embodiment, the cross-sectional shape of the pilot portion 130 (first cross-sectional shape: see Fig.14 ) and the cross-sectional shape of the terrace portion 150 (second cross-sectional shape: see Fig.15 ) are respectively described as being line symmetrical with respect to the straight line passing through the ray 170a,

[0142] Furthermore, in the third embodiment, the cross-sectional shape of the pilot portion 130 (first cross-sectional shape: see Fig.19 ) and the cross-sectional shape of the terrace portion 50 (second cross-sectional shape: refer to Figure 6) are described in detail with respect to the case where they are line symmetric with respect to the straight line passing through the ray 270a, but the rotation positions of the leading portion and the terrace-shaped portion are not limited to this.

[0143] For example, in the case of the first embodiment, the pilot portion 30 may be Figure 5 The position of the guide portion 30 is rotated about the axis 30a, and the cross-sectional shape of the guide portion 30 is not linearly symmetrical with respect to the straight line passing through the ray 70a. Figure 6 The position of the terrace 50 is rotated about the axis 30a, and the cross-sectional shape of the terrace 50 is not line symmetric with respect to the straight line passing through the ray 70a.

[0144] That is, if the positional relationship between the leading portion and the terrace-shaped portion is further generalized, then on the basis of aligning the axes of the leading portion and the terrace-shaped portion,

[0145] (1a) The first cross-sectional shape of the pilot portion and the second cross-sectional shape of the terrace portion may be line-symmetrical with respect to the same straight line, and further,

[0146] (1b) The second cross-sectional shape of the terrace-shaped portion may not be line-symmetrical with respect to the first straight line of interest that is line-symmetrical with respect to the first cross-sectional shape of the pilot portion.

[0147] (1c) Furthermore, the first cross-sectional shape of the pilot portion may not be line-symmetrical with respect to the second straight line of interest about which the second cross-sectional shape of the terrace-shaped portion is line-symmetrical.

[0148] (2) In the first embodiment, the cross-sectional shape (first cross-sectional shape) of the pilot portion 30 on the first intersecting plane PL11 intersecting the extending direction AR1 is a “quadrilateral” (see Figure 5 ), and on the second intersecting plane PL12 intersecting the extending direction AR1, the cross-sectional shape (second cross-sectional shape) of the terrace-shaped portion 50 is an “octagon”,

[0149] In the second embodiment, the cross-sectional shape (first cross-sectional shape) of the pilot portion 130 on the first intersecting plane PL21 intersecting the extending direction AR1 is a “hexagonal” (see Fig.14 ), and on the second intersecting plane PL22 intersecting the extending direction AR1, the cross-sectional shape (second cross-sectional shape) of the terrace-shaped portion 150 is a "dodecagon",

[0150] Furthermore, in the third embodiment, the cross-sectional shape (first cross-sectional shape) of the pilot portion 130 on the first intersecting plane PL21 intersecting the extending direction AR1 is a “hexagonal” (see Fig.19), and on the second intersecting plane PL12 intersecting the extending direction AR1, the cross-sectional shape (second cross-sectional shape) of the terrace-shaped portion 50 is an “octagon”, but is not limited thereto.

[0151] (2a) For example, on a first intersection plane intersecting the extension direction AR1, the first cross-sectional shape of the leading portion may be an n-sided shape (where n is a natural number greater than 4), and on a second intersection plane intersecting the extension direction AR1, the second cross-sectional shape of the terrace-shaped portion may be an m-sided shape (where m is a natural number greater than 5 and different from n).

[0152] (2b) In addition, the above-mentioned m and n may be set to satisfy the formula (1).

[0153] m=2n(1)

[0154] Description of reference numerals:

[0155] 10, 110, 210 punch nuts

[0156] 15, 115, 215 neck

[0157] 16, 116, 216 gap

[0158] 20 Main body

[0159] 23 Flat surface

[0160] 30, 130 pilot unit

[0161] 30a, 130a axis

[0162] 32, 132 outer surface

[0163] 34, 134 outer line

[0164] 36, 136 top surface

[0165] 50, 150 Terrain

[0166] 51, 151 step surface

[0167] 51a, 151a outermost

[0168] 70 (70a~70g), 170 (170a~170g), 270 (270a~270g) rays

[0169] 71 (71a-71g), 171 (171a-171g), 271 (271a-271g) first intersection 72 (72a-72g), 172 (172a-172g), 272 (272a-272g) second intersection 75 (75a~75g), 175 (175a~175g), 275 (275a~275g) gap length 76a, 76b, 176a, 176b, 276a, 276b angle

[0170] A1 Tilt Angle

[0171] AR1 extension direction

[0172] PL11, PL21 first intersection

[0173] PL12, PL22 second intersection surface

Claims

1. A piercing nut, characterized in that: have: (a) Main body; (b) a terrace portion provided near the center of the flat surface of the main body portion and formed in a thin plate shape; and (c) a guide portion protruding from the vicinity of the center of the step surface provided on the terrace-shaped portion in the extending direction, The step surface of the terrace-shaped portion is formed to be raised from the flat surface; The outer peripheral surface of the pilot portion and the step surface of the terrace-shaped portion are connected at a neck portion between the terrace-shaped portion and the pilot portion, thereby forming a gap near the neck portion; On a first intersecting surface intersecting the extending direction, a first cross-sectional shape of the leading portion is an n-sided shape (where n is a natural number greater than 4); On a second intersecting plane intersecting the extending direction, a second cross-sectional shape of the terrace-shaped portion is an m-sided shape (wherein m is a natural number greater than 5 and different from n); and The length of the outer circumference of the leading portion on the first intersection surface increases as the first intersection surface moves away from the step surface toward the top end surface side of the leading portion; (i) defining an intersection point between a ray extending from the axis of the pilot portion along the step surface and the outer peripheral surface as a first intersection point, (ii) defining the intersection point of the ray and the outermost periphery of the step surface as a second intersection point, (iii) defining the length of a line segment connecting the first intersection point and the second intersection point as a gap length, On this basis, when the rotational position of the ray changes around the axis, the gap length at each rotational position changes.

2. A piercing nut, characterized in that: have: (a) Main body; (b) a terrace portion provided near the center of the flat surface of the main body portion and formed in a thin plate shape; and (c) a guide portion protruding from the vicinity of the center of the step surface provided on the terrace-shaped portion in the extending direction; The step surface of the terrace-shaped portion is formed to be raised from the flat surface; The outer peripheral surface of the pilot portion and the step surface of the terrace-shaped portion are connected at a neck portion between the terrace-shaped portion and the pilot portion, thereby forming a gap near the neck portion; On a first intersecting surface intersecting the extending direction, a first cross-sectional shape of the leading portion is an n-sided shape (where n is a natural number greater than 4); On a second intersecting plane intersecting the extending direction, a second cross-sectional shape of the terrace-shaped portion is an m-sided shape (wherein m is a natural number greater than 5 and different from n); and The length of the outer circumference of the leading portion on the first intersection surface increases as the first intersection surface moves away from the step surface toward the top end surface side of the leading portion; (i) defining an intersection point between a ray extending from the axis of the pilot portion along the step surface and the outer peripheral surface as a first intersection point, (ii) defining the intersection point of the ray and the outermost periphery of the step surface as a second intersection point, (iii) defining the length of a line segment connecting the first intersection point and the second intersection point as a gap length, (iv) defining the length of a line segment connecting the axis and the first intersection point as a pilot diameter, On this basis, when the rotational position of the ray changes around the axis, the gap length and the pilot diameter at each rotational position change, and the position of the gap corresponding to each rotational position changes.

3. A piercing nut, characterized in that: have: (a) Main body; (b) a terrace portion provided near the center of the flat surface of the main body portion and formed in a thin plate shape; and (c) a guide portion protruding from the vicinity of the center of the step surface provided on the terrace-shaped portion in the extending direction; The step surface of the terrace-shaped portion is formed to be raised from the flat surface; The outer peripheral surface of the pilot portion and the step surface of the terrace-shaped portion are connected at a neck portion between the terrace-shaped portion and the pilot portion, thereby forming a gap near the neck portion; On a first intersecting surface intersecting the extending direction, a first cross-sectional shape of the leading portion is an n-sided shape (where n is a natural number greater than 4); On a second intersecting plane intersecting the extending direction, a second cross-sectional shape of the terrace-shaped portion is an m-sided shape (wherein m is a natural number greater than 5 and different from n); and The length of the outer circumference of the leading portion on the first intersection surface increases as the first intersection surface moves away from the step surface toward the top end surface side of the leading portion; A third cross-sectional shape of the pilot portion intersecting the step surface is surrounded by the outermost periphery of the step surface.

4. The piercing nut according to any one of claims 1 to 3, characterized in that In a cross section including the axis of the pilot portion, an inclination angle between the outer peripheral surface and the step surface is 65 to 80 degrees.

5. The piercing nut according to any one of claims 1 to 4, characterized in that Satisfies the following formula (C1), m=2n(C1).

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