Frictional penetration fastening member and frictional penetration fastening module

Abstract

The present invention provides a fractional penetration fastening member (10) and a fractional penetration fastening module, the fastening member allowing a plurality of flat sheets to be joined together due to the softened state of the material from frictional heat generated by high-speed rotation, and the fastening member comprising: a penetration unit (11) penetrating, via friction, a plurality of flat sheets; a threading unit (13) connected to the end of the penetration unit (11) and provided with outer circumferential threads (13a) for forming and binding screw threads on the inner surface of a through-hole passing through the plurality of flat sheets; and a fastener head (15) connected to the end of the threading unit (13), wherein the cross sections of the penetration unit (11) and threading unit (13) differ in shape.

Description

Frictional penetration fastening member and frictional penetration fastening module

[0001] The present invention relates to a member for fastening, such as joining plates, and to a fastening member that enables fastening between multiple plates by high-speed rotation without requiring processes such as cutting, and to a fastening module formed by the fastening member.

[0002]

[0003] With the advancement of industrial technology, various industrial and household equipment such as automobiles and robots are being manufactured, manufacturing methods are being researched in diverse ways, and manufacturing processes are being applied in actual fields.

[0004] In particular, as technologies such as robots and electric vehicles advance, there is a growing demand for rapid and highly reliable manufacturing methods that move away from traditional production methods and adapt to the diversity of materials and the sophistication of designs.

[0005] In the case of conventional methods for fastening multiple plates, manufacturing methods were implemented that involved direct fastening or required additional fastening elements such as rivets or speed nuts as intermediaries.

[0006] However, this method was accompanied by problems such as weakened binding strength of the plates due to low fastening force caused by the short length of the fastening members, longer process time as the number of parts increases, a higher possibility of defects as the number of processes increases, and higher manufacturing costs.

[0007]

[0008] Accordingly, the purpose of the present invention is to resolve the above-mentioned problems by providing a fastening member and a module through the same that enable fastening between multiple plates using frictional heat generated by the high-speed rotation of the fastening member.

[0009] The present invention provides a frictional penetration fastening member (10) that enables mutual fastening of multiple plates by forming a material softening state using frictional heat generated by high-speed rotation, comprising: a penetration portion (11) that is positioned to penetrate through friction with multiple plates; a threading portion (13) that is connected to the end of the penetration portion (11) and is equipped with an outer thread (13a) that forms and fastens screw threads on the inner surface of the penetration hole of multiple plates; and a fastening head (15) connected to the end of the threading portion (13), wherein the cross-sections of the penetration portion (11) and the threading portion (13) are each having different shapes.

[0010] In the above frictional penetration fastening member, at least a portion of the cross-sectional shape of the threading portion (13) may be a rounded polygonal shape.

[0011] In the above frictional penetration fastening member, the threading portion (13) may include: a threading forming portion (131) connected to the penetration portion (11) and having at least a portion of the outer thread (13a) formed starting to be formed toward the fastening head (15); a threading base portion (135) connected to the fastening head (15); and a threading fastening portion (133) disposed between the threading forming portion (131) and the threading base portion (135), having at least another portion of the outer thread (13a) formed toward the threading base portion (135).

[0012] In the above frictional penetration fastening member, the outer thread (13a) may include an outer thread forming part (131a) disposed in the threading forming part (131) and an outer thread fastening part (133a) disposed in the threading fastening part (133).

[0013] In the above frictional penetration fastening member, the outer thread forming portion (131a) and the outer thread fastening portion (133a) have the same thread width, and the outer diameter of the thread may be different.

[0014] In the above frictional penetration fastening member, the outer thread forming portion (131a) and the outer thread fastening portion (133a) may have different thread widths.

[0015] In the above frictional penetration fastening member, the thread height of the outer circumferential thread forming portion (131a) may be lower than the thread height of the outer circumferential thread fastening portion (133a).

[0016] In the above frictional penetration fastening member, the length of the threading base portion (135) and the threading fastening portion (133) may be longer than the length of one side of the plurality of plates and the plurality of plates funnel.

[0017] In the above frictional penetration fastening member, the cross-sectional shape of the threading forming portion (131) and the threading fastening portion (133) may be rounded polygonal.

[0018] In the above frictional penetration fastening member, the threading portion (13) may be tapered along the longitudinal direction from the threading forming portion (131) toward the threading fastening portion (133).

[0019] In the above frictional penetration fastening member, at least a portion of the outer thread (13a) may be a rounded thread.

[0020] In the above frictional penetration fastening member, at least a portion of the cross-sectional shape of the penetration portion (11) may be a rounded rectangular shape.

[0021] In the above frictional penetration fastening member, the length of the threading base portion (135) and the threading fastening portion (133) may be longer than the length of one side of the plurality of plates and the plurality of plates funnel.

[0022] In the above frictional penetration fastening member, the fastening head (15) may be provided with a fastening head cavity (153) that forms an internal cavity when in contact with a plurality of plate materials on the bottom surface facing the threading portion (13).

[0023] In the above frictional penetration fastening member, a fastening head cavity line (1531) that partitions the fastening head cavity (153) may be provided inside the fastening head cavity (153).

[0024] In the above frictional penetration fastening member, the fastening head cavity line (1531) may be radially arranged from the threading part (13) when projected onto a plane perpendicular to the longitudinal direction of the penetration part (11) and the threading part (13).

[0025] In the above frictional penetration fastening member, the fastening head cavity line (1531) may be arranged in a curved spiral from the threading part (13) toward the outer circumference of the fastening head (15) when projected onto a plane perpendicular to the longitudinal direction of the penetration part (11) and the threading part (13).

[0026] In the above frictional penetration fastening member, at least a portion of the fastening head cavity (153) may be provided with a cavity distance reduction portion (Acd) in which the cavity distance (dc) between the inner side forming the fastening head cavity (153) and one surface of the plurality of plates decreases as it moves in the radial direction when mounting the plurality of plates.

[0027] In the above frictional penetration fastening member, at least a portion of the fastening head cavity (153) may be provided with a cavity distance increasing portion (Aci) such that the cavity distance (dc) between the inner side forming the fastening head cavity (153) and one surface of the plurality of plates increases in the radial direction when mounting the plurality of plates.

[0028] In the above frictional penetration fastening member, the fastening head (15) may include a head serration (151a) that is formed as a protrusion or groove on the contact surface with the plate.

[0029] In the above frictional penetration fastening member, the head serration (151a) may have a different angle of inclination with respect to the direction of rotation.

[0030] In the above frictional penetration fastening member, the head serration (151a) may form a swirling arrangement structure with respect to the rotational direction.

[0031] In the above frictional penetration fastening member, at least a portion of the outer surface of the penetration portion (11) may form a cycloid curve.

[0032] In the above frictional penetration fastening member, at least a portion of the outer thread (13a) of the threading portion (13) may have different thread angles along the length of the threading portion (13).

[0033] According to another aspect of the present invention, the present invention provides a frictional penetration fastening member module (1) comprising a plurality of plates (L) and a frictional penetration fastening member (10) that enables mutual fastening of the plurality of plates by forming a material softening state using frictional heat generated by high-speed rotation, the frictional penetration fastening member comprising a penetration portion (11) that is positioned through the plurality of plates through friction, a threading portion (13) that is connected to the end of the penetration portion (11) and is equipped with an outer circumference thread (13a) that forms and fastens screw threads on the inner surface of the penetration hole of the plurality of plates, and a fastening head (15) connected to the end of the threading portion (13), wherein the cross-sections of the penetration portion (11) and the threading portion (13) respectively have different shapes.

[0034] In the above frictional penetration fastening member module, the threading portion (13) comprises: a threading forming portion (131) connected to the penetration portion (11) and having at least a portion of the outer circumferential thread (13a) formed starting toward the fastening head (15); a threading base portion (135) connected to the fastening head (15); and a threading fastening portion (133) disposed between the threading forming portion (131) and the threading base portion (135), having at least another portion of the outer circumferential thread (13a) formed toward the threading base portion (135); wherein, when the thickness of the upper plate among the plurality of plates is S1 and the thickness of the lower plate is S2, the effective thread length (b), which is the length of the threading base portion (135) and the threading fastening portion (133), and the length of one side of the plurality of plates and the plurality of plates funnel (S3). In the liver A relationship is formed, and the thickness (S2) of the lower plate (L2) and the thickness (S3) from the bottom of the lower funnel formed on the bottom side plate (L2) may have a thickness ratio (S2 / S3) of 0.67 to 1.3.

[0035] According to the present invention, the frictional penetration fastening member and module according to one embodiment of the present invention have the following effects.

[0036] First, the frictional penetration fastening member and module of the present invention do not require a separate medium and can provide excellent fastening force between target plates regardless of whether the length of the fastening member is short or long according to the specifications.

[0037] Second, the frictional penetration fastening member and module of the present invention may increase productivity by not requiring separate components, minimizing material damage, enhancing plate bonding strength, shortening process time due to the simplification of the number of parts, lowering the possibility of defects due to the reduction of the number of processes, and significantly reducing manufacturing costs.

[0038]

[0039] FIG. 1 is a schematic diagram of a frictional penetration fastening member according to an embodiment of the present invention.

[0040] FIGS. 2 to 7 are schematic partial cross-sectional views taken along lines II, II-II, III-III, and IV-IV of FIG. 1.

[0041] FIG. 8 is a partial enlarged view of the penetration portion (11) of the frictional penetration fastening member (10).

[0042] FIG. 9 is a graph showing an example of a preset range radius (Rs) including a preset maximum radius (Rs,mzx) and a preset minimum radius (Rs,min) according to an embodiment of the present invention, and a tip radius (R111) of a penetration tip (111).

[0043] FIG. 10 is a graph showing an example of the radius of curvature (R113; R113a, R113b, R113c) of a penetration body (113) configured such that a penetration tip (111) according to an embodiment of the present invention is positioned at the tip.

[0044] FIG. 11 is a partial enlarged view of the thread portion (13) of the frictional penetration fastening member (10).

[0045] FIG. 12 is a diagram showing an example of a screw thread structure in which front and rear inclined surfaces (113af, 113ab) have different screw thread inclination angles (θ1, θ2) according to an embodiment of the present invention.

[0046] FIG. 13 is a schematic partial cross-sectional view of a frictional penetration fastening member and module.

[0047] Figure 14 is a partial enlarged cross-sectional view of the fastening head.

[0048] FIG. 15 is a state diagram projected onto a plane perpendicular to the longitudinal direction of the thread portion of the fastening head.

[0049] Figure 16 is a partial cross-sectional view taken along line VV of Figure 15.

[0050] FIG. 17 is a state diagram of a modified example of a state diagram when projected onto a plane perpendicular to the longitudinal direction of the thread portion of the fastening head.

[0051] FIGS. 18 and FIGS. 19 are diagrams of the shape structure of the fastening head cavity of the present invention.

[0052] FIG. 20 is a diagram showing the configuration of head serrations formed on the seating surface of a fastening head according to an embodiment of the present invention.

[0053] FIG. 21 is a side view of a tapering configuration in which the outer diameter of the screw thread from the tip to the head is gradually increased according to an embodiment of the present invention.

[0054] FIG. 22 is a flowchart illustrating the process of forming a frictional penetration fastening member module by fastening a plurality of plate materials through a frictional penetration fastening member of an embodiment of the present invention.

[0055]

[0056] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, it should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the present invention, if it is determined that a detailed description of related known components or functions could obscure the essence of the invention, such detailed description is omitted.

[0057]

[0058] The present invention enables the frictional penetration fastening member (10) to mutually fasten multiple plate materials by forming a softened state of the material using frictional heat generated by high-speed rotation.

[0059] FIG. 1 shows a schematic diagram of a frictional penetration fastening member according to an embodiment of the present invention, FIG. 2 to 7 show schematic partial cross-sectional views taken along lines II, II-II, III-III, and IV-IV of FIG. 1, FIG. 8 shows a partial enlarged view of the penetration portion (11) of the frictional penetration fastening member (10), FIG. 11 shows a partial enlarged view of the thread portion (13) of the frictional penetration fastening member (10), FIG. 13 shows a schematic partial cross-sectional view of the frictional penetration fastening member and module, FIG. 14 shows a partial enlarged cross-sectional view of the fastening head. FIG. 15 shows a state diagram projected onto a plane perpendicular to the longitudinal direction of the thread portion of the fastening head, FIG. 16 shows a partial cross-sectional view taken along line VV of FIG. 15. FIG. 17 illustrates a modified example of the state diagram projected onto a plane perpendicular to the longitudinal direction of the thread portion of the fastening head. FIG. 18 and FIG. 19 illustrate the shape structure state of the fastening head cavity (153) of the present invention. FIG. 22 illustrates a flowchart showing the process of forming a frictional penetration fastening member module (1) by fastening a plurality of plate materials through the frictional penetration fastening member (10) of the present invention.

[0060]

[0061] First, as shown in FIGS. 1 and 2, a frictional penetration fastening member according to one embodiment of the present invention comprises a penetration portion (11), a threading portion (13), and a fastening head (15), and each cross-section of the penetration portion (11) and the threading portion (13) has a different shape from each other.

[0062] The penetration portion (11) is positioned to penetrate through friction with a plurality of plates, and the threading portion (13) is connected to the end of the penetration portion (11), and the threading portion (13) is provided with an outer circumferential thread (13a) on its outer surface. The outer circumferential thread (13a) forms screw threads on the inner surface of the penetration hole of the plurality of plates and forms a connection with the plurality of plates, and the fastening head (15) is connected to the end of the threading portion (13).

[0063] At this time, the cross-sections of the penetration portion (11) and the threading portion (13) of the fastening head (15) of the present invention each have different shapes.

[0064] More specifically, the penetration portion (11) forms the tip portion of the frictional penetration fastening member (10). The penetration portion (11) has a structure in which the cross-sectional area increases along the length toward the fastening head (15), and a penetration tip (111) is formed at the foremost end. The tip radius (R111) of the penetration tip (111) has a preset range radius (Rs). Here, the preset range radius (Rs) includes a preset maximum radius (Rs,mzx) and a preset minimum radius (Rs,min).

[0065]

[0066] Through a preset range radius (Rs), softening penetration of multiple plates is achieved quickly during high-speed rotation, and simultaneously, through appropriate axial pressure, fastening is achieved by forming screw threads simultaneously with penetration. That is, if the radius of the penetration tip is excessively small, the material softening area utilizing frictional heat from high-speed rotation is narrowed, requiring a larger pressure for penetration, which constrains the formation of a smooth friction penetration screw fastening state. On the other hand, if a penetration tip with an excessively large radius is provided, the penetration control under the axial pressure required for penetration by high-speed rotation is not easy due to the excessive expansion of the friction area, or the control of the torque amount required for forming screw threads after material softening penetration due to friction by high-speed rotation is not easy, which may constrain the formation of a friction penetration screw fastening state.

[0067] FIG. 9 illustrates an example of a preset range radius (Rs) including a preset maximum radius (Rs,mzx) and a preset minimum radius (Rs,min), and a tip radius (R111) of a penetration tip (111). That is, the tip radius (R111) of the penetration tip (111) allows for various operation implementations through a range between the preset maximum radius (Rs,mzx) and the preset minimum radius (Rs,min).

[0068] Additionally, FIG. 10 illustrates an example of the radius of curvature (R113; R113a, R113b, R113c) of a penetration body (113) configured such that a penetration tip (111), described later, is positioned at the tip. The penetration body (113) may have a multi-zone structure comprising three regions: a penetration leading body (113a), a penetration medium body (113b), and a penetration trailing body (113c).

[0069] A previously described penetration tip (111) is positioned at the end of the penetration leading body (113a), a penetration medium body (113b) is connected in succession to the penetration leading body (113a), and a penetration trailing body (113c) is connected to the penetration medium body (113b) so that the penetration medium body (113b) is positioned between the penetration leading body (113a) and the penetration medium body (113b).

[0070] In some cases, the three regions, the penetration leading body (113a), the penetration medium body (113b), and the penetration trailing body (113c), may have specialized radii of curvature. The radius of curvature of the penetration leading body (113a) is indicated by reference numeral R113a, the radius of curvature of the penetration medium body (113b) by reference numeral R113b, and the radius of curvature of the penetration trailing body (113c) by reference numeral R113c. Here, the centers of the radii of curvature are depicted as O113b, O113b, and O113c, respectively, but they are not always located on the same line; this is for convenience of illustration and the present invention is not limited thereto.

[0071] The radius of curvature (R113a) of the penetration leading body (113a) may take a value larger than the radius of curvature of the penetration tip (111) described above as a structure for penetration, thereby forming a variable structure that takes continuity at the connecting end.

[0072] The radius of curvature (R113c) of the penetration trailing body (113c) may maintain the largest value to form a stable transition structure to the subsequent thread section (13).

[0073] The radius of curvature (R113b) of the penetration medium body (113b) takes a value between the radius of curvature (R113a) of the penetration leading body (113a) and the radius of curvature (R113c) of the penetration trailing body (113c), and may have a variable radius of curvature depending on the area of ​​the outer circumference, and may have a configuration in which the rate of change of the radius in the area changes continuously as shown in FIG. 10, and the outer circumference profile may be configured to have a cycloid profile. Various modifications are possible, such as forming the shortest distance on a continuous line along the length through such a cycloid profile, thereby enabling a rapid penetration process on a softened object.

[0074]

[0075] Accordingly, the frictional penetration fastening member (10) of the present invention is provided with an appropriate preset range radius (Rs) so that it penetrates after softening the material using frictional heat with a smaller pressure, and it is possible to form a fastening state with a structure that strengthens the fastening force through the formation of a funnel and the formation of internal screw threads.

[0076] A penetration body (113) is disposed at the rear end of the penetration tip (111). In this embodiment, at least a portion of the cross-sectional shape of the penetration part (11) is a rounded rectangular shape, and in this embodiment, the cross-section of the penetration body (113) has a width that increases toward the rear end, while the cross-sectional shape is a rounded rectangular shape. The cross-section of the penetration body (113) has a rounded rectangular shape cross-section, thereby gradually increasing the friction area due to contact, and through a space forming a gap relative to the effective radius, the softening fluidity of the plate material in which friction is formed among the multiple plate materials in a softened state using frictional heat can be increased, thereby enabling easy penetration.

[0077]

[0078] Meanwhile, a threading section (13) is disposed at the other end of the penetration body (113) of the penetration section (11), and at least a portion of the cross-sectional shape of the threading section (13) may be a rounded polygonal shape. More specifically, various configurations are possible, such as a rounded pentagonal, rounded rectangular, or rounded triangle shape, and various configurations are possible according to design specifications, such as a left-right symmetrical structure or a radially symmetrical structure with respect to the center point between multiple distance points between the center point and the outermost part. More specifically, the threading section (13) of the present embodiment includes a threading forming section (131), a threading base section (135), and a threading fastening section (133).

[0079] The threading forming part (131) is connected to the penetration part (11), and at least a portion of the outer thread (13a) is formed on the outer surface of the threading forming part (131), and at least a portion of the outer thread (13a) begins to be formed in the direction of the fastening head (15).

[0080] The threading base portion (135) is connected to the fastening head (15), the threading fastening portion (133) is positioned between the threading forming portion (131) and the threading base portion (135), and another part of the outer thread (13a) is also formed on the outer surface of the threading fastening portion (133) toward the threading base portion (135).

[0081] At this time, the length of the threading base part (135) and the threading fastening part (133) may have a value longer than the length of one side of the multiple plate and the multiple plate funnel, and this will be described later.

[0082] The outer thread (13a) includes an outer thread forming portion (131a) and an outer thread connecting portion (133a). The outer thread forming portion (131a) is positioned in the threading forming portion (131), and the outer thread connecting portion (133a) is positioned in the threading connecting portion (133). The outer thread forming portion (131a) and the outer thread connecting portion (133a) may be continuously configured in the form of the same screw thread, but depending on the case, the outer thread forming portion (131a) and the outer thread connecting portion (133a) may have different configurations.

[0083] Meanwhile, the pitch of the screw threads between the outer thread forming part (131a) and the outer thread fastening part (133a) of the present invention may be arranged at equal intervals, but the height of the screw threads formed in the outer thread forming part (131a) and the outer thread fastening part (133a) may be different, so the height of the screw threads may be gradually increased in the longitudinal direction, or some part may form an incomplete screw thread at the beginning for thread formation, or a round screw thread may be provided to relieve the load concentrated on the screw thread peaks and prevent screw thread damage when fastening the screw threads of a high-strength steel plate.

[0084] Additionally, the outer thread forming part (131a) and the outer thread connecting part (133a) may have different thread widths. In this embodiment, the thread width of the outer thread forming part (131a) is configured to be narrower than the thread width of the outer thread connecting part (133a). Here, thread width refers to the spacing between threads, i.e., the thread pitch, and as shown in FIG. 11, the thread pitch (P131a) of the outer thread forming part (131a) has a smaller value than the thread pitch (P133a) of the outer thread connecting part (133a).

[0085] By configuring the thread pitch (P131a) of the outer thread forming part (131a) to have a value smaller than the thread pitch (P133a) of the outer thread fastening part (133a), a softened state is formed due to high-speed rotational friction heat between the penetration tip (111) of the penetration part (11) and the penetration body (113), so that after the penetration step is executed, the thread can be smoothly formed on the inner surface of the funnel in the direction of the rotation axis.

[0086] That is, in the axially pressed state through the outer thread forming part (131a), the softened sheet material forms a downward funnel (F) during the process in which it is pressed in the direction penetrating the sheet, i.e., upward and downward. During this process, the high-speed rotational speed is decelerated and stable funnel formation is achieved.

[0087] Additionally, the threads of the outer thread fastening portion (113a) may be of a general thread, but FIG. 12 shows (a) a side view of a frictional penetration fastening member and (b) a partial enlarged view of A in (a). As shown in FIG. 12, the front and rear inclined surfaces (113af, 113ab) may form threads of a structure having different thread inclination angles (θ1, θ2).

[0088] Here, the thread inclination angle (θ1, θ2) of the thread inclination angle (θ1, θ2) is preferably provided with a value of 20 degrees in the range of 10 to 30 degrees to enable smooth operation of the anti-loosening function after fastening, and the thread inclination angle (θ2) is preferably provided with a value of 40 degrees in the range of 30 to 50 degrees to prevent excessive load from being required during fastening.

[0089] On the other hand, as described above, at least a portion of the cross-sectional shape of the threading portion (13) may be a rounded polygonal shape, and the threading forming portion (131), the threading base portion (135), and the threading fastening portion (133) of the present embodiment may all have a rounded triangle cross-sectional shape or a rounded rectangular shape, and various options are possible depending on the design specifications.

[0090] That is, the cross-sectional shape of the threading forming part (131) and the threading fastening part (133) may be rounded polygonal, for example, through a configuration in which the contact points are reduced such as a rounded triangle, the threading forming part (131) with a rounded polygonal cross-sectional shape has a reduced frictional state compared to the penetration part (11) with a rounded rectangular cross-sectional shape, and can facilitate the funnel in the penetration axial direction through the flow space of the softened material. Through the formation of an appropriate funnel, the screw threads placed through it can be stably formed in the longitudinal direction.

[0091] Through this configuration, when the penetration tip (111) of the penetration part (11) and the penetration body (113) rotate at high speed, a softened state of the material is formed in the contact area of ​​the plate due to frictional heat with the plate, and a penetration step is executed to penetrate the softened plate material by applying pressure in the direction of the rotation axis.

[0092]

[0093] Meanwhile, the lengths of the threading base portion (135) and the threading fastening portion (133) can take various configurations depending on the conditions of joining with the fastening member and the plate, and it is preferable that the lengths of the threading base portion (135) and the threading fastening portion (133) be longer than the length of one side of the multiple plate and the multiple plate funnel.

[0094] In the case of the present invention, a plurality of plates (L1, L2) are formed without a pre-hole, but depending on the case, as shown in FIG. 11, a pre-hole (Hp) may be formed in plate (L1) among the plurality of plates (L1, L2), and a frictional penetration fastening member (10) may be formed by penetrating plate (L2) to fasten, and various structures are possible.

[0095] That is, as shown in the drawing, the frictional penetration fastening member (10) of the present invention, which fastens a plurality of plates (L1, L2), is shown in a state in which the plurality of plates (L1, L2) are fastened by penetrating through them. At this time, the thicknesses of the plurality of plates (L1, L2) are respectively denoted by drawing symbols S1 and S2, the thickness from the bottom surface of the bottom side plate (L2) of the downward funnel formed in the upper and lower directions of the bottom side plate (L2) is denoted by drawing symbol S3, the length of the threading base portion (135) and the threading fastening portion (133) is denoted by drawing symbol b, the length of the threading forming portion (131) is denoted by drawing symbol S4, the length of the penetration portion (11) is denoted by drawing symbol S5, and the length from the upper surface of the plate (L1) to the penetration portion (11) is denoted by drawing symbol L. The length indicated by drawing symbol b may be defined as the effective thread length, which is the length required for fastening between the plurality of plates in the plate (L1, L2) and the frictional penetration fastening member (10).

[0096] Accordingly, it is preferable that the following relationship be formed between the effective thread length (b), which is the length of the threading base portion (135) and the threading fastening portion (133) according to one embodiment of the present invention, and between one side of the plurality of plates and the plurality of plates funnel length.

[0097]

[0098] That is, the effective thread length (b) has a value greater than or equal to the length of one side of the multiple plate and the multiple plate funnel, thereby enabling stable thread formation and fastening force in the upper and lower funnels of the drawing.

[0099] In some cases, as described above, it is preferable that the thickness (S2) of the bottom side plate (L2) among the plurality of plates (L1, L2) and the thickness (S3) from the bottom surface of the downward funnel (F) formed in the drawing downward direction of the bottom side plate (L2) have a thickness ratio (S2 / S3) of 0.67 to 1.3.

[0100] For example, if the thickness (S2) of the bottom side plate (L2) is relatively thin, the thickness ratio (S2 / S3) between the thickness (S2) of the bottom side plate (L2) and the thickness (S3) from the bottom surface of the bottom side funnel (L2) can have a value less than 1 so that the thickness (S3) of the bottom funnel formed on the plate (L2) can form a thicker structure to maintain the fastening force in the fastening state, and it is preferable that the thickness ratio (S2 / S3) have a value of 0.6 or more. If the thickness ratio (S2 / S3) is less than 0.6, the thickness (S3) from the bottom surface of the bottom funnel is too excessive compared to the thickness of the bottom side plate (L2), making it difficult to form stable screw threads inside the bottom funnel.

[0101] Conversely, when the thickness (S2) of the bottom side plate (L2) is relatively thick, the thickness of the plate (L2) can sufficiently maintain the fastening force of the fastening state, so there is no need for the thickness (S3) of the lower funnel to be excessively thick. Therefore, the thickness ratio (S2 / S3) between the thickness (S2) of the bottom side plate (L2) and the thickness (S3) from the bottom surface of the bottom side plate (L2) of the funnel can have a value greater than 1, but it is preferable that the thickness ratio (S2 / S3) has a value of 1.5 or less. If the thickness ratio (S2 / S3) is greater than 1.5, the thickness of the bottom side plate (L2) is excessively large compared to the thickness (S3) from the bottom surface of the bottom funnel, so that the material is drawn upward even after forming the bottom funnel, and the formation of the upper side funnel or excessive material drawing may cause the chipless process to be inhibited due to the elution of the softened material toward the fastening head (15). Therefore, it is preferable that the thickness ratio (S2 / S3) between the thickness (S2) of the bottom side plate (L2) and the thickness (S3) of the bottom side plate (L2) from the bottom surface of the bottom funnel be 1.5 or less.

[0102]

[0103] On the other hand, the threading portion (13) may be tapered along the longitudinal direction from the threading forming portion (131) toward the threading fastening portion (133). That is, as shown in FIGS. 7 and FIGS. 11, the threading portion (13) may distribute the torque applied to the threads during the thread formation process after penetration through the tapered structure.

[0104]

[0105] In some cases, at least a portion of the cross-sectional shape of the threading portion (13) may have a rounded thread shape. In this embodiment, the threading forming portion (131), the threading base portion (135), and the threading fastening portion (133) may have a rounded thread cross-sectional shape. Through this cross-sectional structure, the load concentrated on the thread peaks with a rounded thread shape can be reduced, thereby preventing thread damage during thread fastening of high-strength steel plates.

[0106]

[0107] The fastening head (15) includes a fastening head base (15a) and a fastening head body (15b). The fastening head base (15a) is connected to the threading base (135) of the threading section (13), and the fastening head body (15b) is connected to the fastening head base (15a) to form an interlocking structure with a tool (not shown) for transmitting rotational force and pressure when fastening multiple plates.

[0108] On the other hand, the fastening head (15) of the present invention may also be provided with a fastening head cavity (153). FIG. 13 shows a schematic partial cross-sectional view of a frictional penetration fastening member and module, and FIG. 14 shows a partial enlarged cross-sectional view of the fastening head. That is, as described above, the fastening head (15) is connected to a threading base portion (135), and as shown in FIG. 13, the bottom surface of the fastening head (15) is provided with a fastening head seating portion (151), the fastening head seating portion (151) forms a fastening state with the plate (L1) during the tightening stage and can prevent the fastening from loosening through friction between the two through a pressurized contact state with the plate.

[0109] At this time, a fastening head cavity (153) may be formed on one side of the fastening head seating portion (151), and the fastening head cavity (153) forms an internal cavity when in contact with at least some of the plurality of plate materials on the bottom surface facing the threading portion (13). The fastening head cavity (153) can prevent fastening defects that occur when a softened material is drawn out through the upper through-hole and discharged to the outside, and placed in the space between the fastening head (15) and the plate material (L1) during the fastening process.

[0110] At this time, the frictional penetration fastening member (10) of the present invention may have a simple cavity structure, but the fastening head cavity (153) of the frictional penetration fastening member (10) of the present invention may further have a structure that guides the flow of material drawn out in a softened state from a fastening through hole (H, see FIG. 13) formed in at least one of the plurality of plate materials (L1, L2). FIG. 15 shows a state diagram projected onto a plane perpendicular to the longitudinal direction of the thread portion of the fastening head, and FIG. 16 shows a partial cross-sectional view taken along line VV of FIG. 15. That is, as shown in FIG. 15 and FIG. 16, a fastening head cavity line (1531) may be further provided inside the fastening head cavity (153), and the fastening head cavity line (1531) partitions the fastening head cavity (153). That is, the fastening head cavity line (1531) is formed protruding from the inner surface forming the fastening head cavity (153), and the fastening head cavity line (1531) and the fastening head cavity (153) may have various arrangement structures.

[0111] The fastening head cavity line (1531) may have a shape that is radially arranged from the threading part (13) when projected onto a plane perpendicular to the longitudinal direction of the penetration part (11) and the threading part (13). That is, as shown in FIGS. 15 and 16, a radial radial arrangement structure may be formed from the center connected to the threading base part (135) toward the side end forming the outer edge of the fastening head cavity (153) formed in the fastening head (15). Through this radial radial structure, the arrangement of the softened material drawn out from the fastening through hole may be induced, thereby minimizing the occurrence of problems such as fastening resistance caused by loading on the fastening through hole side.

[0112] In addition, the fastening head cavity line of the present invention is not limited to the radial direction only. The fastening head cavity line (1531) may have a projected structure such as a curved spiral structure or a helical structure. FIG. 17 shows a modified example of the state diagram when projected onto a plane perpendicular to the longitudinal direction of the threading portion of the fastening head. As shown in FIG. 17, the fastening head cavity line (1531) may be arranged in a curved spiral from the threading portion (13) toward the outer circumference of the fastening head (15) when projected onto a plane perpendicular to the longitudinal direction of the penetration portion (11) and the threading portion (13). In this case, the flow of the softening material drawn out from the fastening through hole may be guided to increase the path, thereby minimizing the occurrence of a loading state toward the fastening through hole and maximizing the loading space.

[0113]

[0114] Meanwhile, the shape of the fastening head cavity (153) can have various shapes. FIGS. 18 and FIGS. 19 illustrate the shape structure of the fastening head cavity (153) of the present invention.

[0115] As illustrated in FIG. 18, a cross-sectional shape may be provided such that the maximum distance from the upper surface of the plate is provided in the vicinity of the threading base portion (135). More specifically, at least a portion of the fastening head cavity (153) may be provided with a cavity distance reduction portion (Acd) in which the cavity distance (dc) between the inner side forming the fastening head cavity (153) and one side of the plate facing among the plate is reduced as it moves in the radial direction when mounted on a plate having multiple plate fastenings. That is, when a cross-section is formed along the center of the fastening head (15) in the longitudinal direction of the threading part (13), the cavity distance (dc) between the inner side forming the fastening head cavity (153) and one side of the opposing plate among the plurality of plates has the largest value in the area near the center of the fastening head (15), and the cavity distance (dc) between the inner side forming the fastening head cavity (153) and one side of the opposing plate among the plurality of plates has a region that decreases as it moves away from the area near the center of the fastening head (15) in the radial direction (r), and this region is called the cavity distance reduction part (Acd). Through such a configuration, the cross-section of the fastening head cavity (153) in the drawing can have a structure in which the cavity distance (dc) has a large value at the center side and decreases at the outer side as it moves away in the radial direction.

[0116] Through such a structure, the material in a softened fluid state drawn from the fastening through hole is not loaded near the fastening through hole, but moves in the longitudinal direction to the central side area of ​​the fastening head (15) connected to the threading base part (135) and is guided in the radial direction, thereby enabling the smooth formation of a chipless fastening structure.

[0117] On the other hand, the fastening head cavity (153) of the present invention may have a structure in which the cavity distance (dc) in the area where the thread portion (13) and the fastening head (15) are connected is relatively small, and the cavity distance (dc) increases in at least some parts as it moves toward the outer edge. That is, as shown in FIG. 19, at least some part of the fastening head cavity (153) of the frictional penetration fastening member (10) is provided with a cavity distance increasing portion (Aci) in which the cavity distance (dc) between the inner side forming the fastening head cavity (153) and one surface of the multiple plates increases as it moves toward the radial direction when mounted to fasten multiple plates.

[0118] By adopting a structure in which the cavity distance (dc) increases as it moves radially outward from the central region, the fluid material drawn out from the fastening penetration hole is guided to the radial outer edge, thereby preventing problems caused by the material being loaded near the fastening penetration hole. Additionally, by adopting a structure in which the cavity distance (dc) increases in the direction outward from the connection center region of the fastening head (15) and the thread portion (13), the rigidity at the connection point between the fastening head (15) and the thread portion (13) is strengthened, thereby preventing the risk of damage that may occur during the fastening of the frictional penetration fastening member (10).

[0119] Additionally, the fastening head (15) may be further equipped with components to solidify the fastening state. FIG. 20 illustrates the configuration of the head serrations (151a) formed on the seating surface of the fastening head (15). FIG. 20 illustrates (a) a side view of a frictional penetration fastening member, (b) a partial enlarged view of B in (a), and (c) a cross-sectional view along line CC of B. Here, the head serrations (151a) are formed on the seating surface where the fastening head (15) is seated and contacts the plate material, and may perform a function to prevent loosening due to increased pressure through a reduction in the contact surface through a protrusion structure or a groove structure. In addition, these head serrations (151a) may take a sawtooth structure rather than a simple protrusion or groove structure. As shown in FIG. 20 (c), the fastening serration (151a) may have different angles of inclination (α, β) on one side and the other side with respect to the inclined surface.

[0120] In addition, these head serrations (151a) may have a swirling shape to increase resistance to the unwinding rotation direction.

[0121] Here, the difference in inclination angle may have various values, but to prevent excessive surface damage and to provide an appropriate anti-loosening function, it is desirable to have an angle difference in the range of at least 50 to 70 degrees, and for the right rotation direction, a value of 70 to 89 degrees, preferably 80 degrees, and for the left rotation direction, a value of 5 to 20 degrees, preferably 10 degrees, can be provided to compensate for the small loosening torque caused by the small seating area.

[0122] In addition, as shown in FIG. 21, a tapering configuration can be adopted in which the outer diameter of the screw thread is gradually increased from the tip to the head. Here, the angle (γ) due to the taper can have a value of 1 to 5 degrees, preferably 2 degrees. At this time, the outer diameter may be designed to be larger as it approaches the base, and a rounded polygonal cross-section may be applied to compensate for the reduced cross-sectional area and increase the maximum torque.

[0123]

[0124] Hereinafter, with reference to the drawings, the process of forming a frictional penetration fastening member module (1) by fastening a plurality of plates through the frictional penetration fastening member (10) of the present invention is described. FIG. 22 shows a flowchart illustrating the process of forming a frictional penetration fastening member module (1) by fastening a plurality of plates through the frictional penetration fastening member (10) of the present invention.

[0125] First, the manufacturing process of a frictional penetration fastening member module (1) formed by fastening multiple plate materials (L; L1, L2) through a frictional penetration fastening member (10) may include a preparation step (S1), a frictional softening step (S10), a penetrating funnel forming step (S20), a screw thread forming step (S30), and a screw fastening tightening step (S40).

[0126] In the preparation stage (S1), multiple plates (L; L1, L2) are aligned at the position where the fastening points are aligned for fastening, and a frictional penetration fastening member (10) is placed at the corresponding fastening point. At this time, a fastening tool is provided for positioning and operating the frictional penetration fastening member (10), but a detailed description thereof is omitted.

[0127] The frictional softening step (S10) is a preliminary step for forming a funnel through the frictional penetration fastening member (10). In the frictional softening step (S10), the frictional penetration fastening member (10) receives rotational force and pressure to form a high-speed rotational state. At this time, the rotational speed, torque, and pressure of the frictional penetration fastening member (10) are controlled. In the frictional softening step (S10), frictional force is generated by the high-speed rotation of the frictional penetration fastening member (10), which is converted into thermal energy, and a material softening state is formed at the contact point between the frictional penetration fastening member (10) and the plate material due to frictional heat.

[0128] Then, a penetrating funnel formation step (S20) is executed. In the penetrating funnel formation step (S20), penetration of the plate material and funnel formation are performed, and the penetrating funnel formation step (S20) includes a penetration step (S21) and a funnel formation step (S23).

[0129] In the penetration step (S21), the high-speed rotation state from the frictional softening step (S10) is maintained, and a predetermined pressure is applied to the softened material to penetrate the plate.

[0130] Even in the funnel creation step (S23), the high-speed rotational state of the frictional penetration fastening member (10) is maintained, and the softened material is flowed downward through the fastening penetration hole to form a funnel. However, unlike in the penetration step (S21), the axial pressure is reduced, and the frictional penetration fastening member (10) moves downward at an appropriate speed rather than rapidly penetrating the flowing material, thereby continuously moving the softened material downward, making it possible to manufacture a funnel with a stable structure.

[0131] After the funnel formation step (S23) is completed, the thread formation step (S30) is executed, and in the thread formation step (S30), threads are formed on the inner side of the funnel formed below. At this time, unlike in the preceding penetration funnel formation step (S20), the rotational speed is reduced, and the axial pressure is also formed to be smaller than in the penetration funnel formation step (S20) at the beginning of the step. However, in order to form threads on the funnel due to the reduction in the rotational speed of the preliminary penetration fastening member (10), appropriate axial pressure and torque are applied and proceeded, and the axial pressure and torque are reduced in the final stage of thread formation. In this stage, the threads formed on the funnel are formed stably on the funnel through the threading forming part (131) of the preliminary penetration fastening member (10).

[0132] Then, a screw fastening step (S40) may be executed. The screw fastening step (S40) includes a screw fastening step (S41) and a screw tightening step (S43).

[0133] In the screw fastening step (S41), the fastening process is performed at a smaller rotational speed than in the preceding steps to complete the configuration in which the threading fastening part (133) of the frictional penetration fastening member (10) engages with the screw thread on the funnel formed in the screw thread forming step (S30).

[0134] Then, in the screw tightening step (S43), the transmission of rotational torque is blocked as it approaches the threads inside the funnel and the end side of the threading base part (135) of the threading fastening part (133), so a large torque resistance may occur due to the rotational resistance of the frictional penetration fastening member (10).

[0135] Through this process, a plurality of plate materials can be fastened and connected through the frictional penetration fastening member (10) of the present invention to form a frictional penetration fastening member module (1).

[0136]

[0137] The foregoing description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations within the scope of the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are intended to explain, not limit, the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by these embodiments. The scope of protection of the present invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention.

[0138]

[0139] The frictional penetration fastening member and module of the present invention can be applied and utilized in various ways within the scope of forming a bonding structure resulting from the softening of sheet metal, such as in general machine materials, special machines, automobiles, particularly electric vehicles, robots, and rockets.

Claims

1. A frictional penetration fastening member that enables multiple plates to be fastened together by forming a softened material state using frictional heat generated by high-speed rotation, A penetration portion (11) that is positioned through through friction with multiple plate materials, and A threading part (13) having an outer circumference thread (13a) connected to the end of the penetration part (11) and formed and fastened to the inner surface of a plurality of plate through holes, and It includes a fastening head (15) connected to the end of the threading part (13), and A frictional penetration fastening member (10) characterized in that the cross-sections of the penetration portion (11) and the threading portion (13) respectively have different shapes.

2. In Paragraph 1. Frictional penetration fastening member (10) characterized in that at least a portion of the cross-sectional shape of the threading portion (13) is a rounded polygonal shape.

3. In Paragraph 2, The threading unit (13) above is: A threading forming portion (131) connected to the penetration portion (11) and in which at least a portion of the outer thread (13a) begins to be formed in the direction of the fastening head (15), and The threading base part (135) connected to the above-mentioned fastening head (15) A frictional penetration fastening member (10) characterized by including a threading fastening member (133) disposed between the threading forming member (131) and the threading base member (135), wherein at least another part of the outer thread (13a) is formed toward the threading base member (135).

4. In Paragraph 3, The above outsourced thread (13a) is An outer thread forming part (131a) disposed on the threading forming part (131) above, and A frictional penetration fastening member (10) characterized by including an outer thread fastening member (133a) disposed on the threading fastening member (133) above.

5. In Paragraph 4, Frictional penetration fastening member (10) characterized in that the outer thread forming portion (131a) and the outer thread fastening portion (133a) have the same thread width and include different outer thread diameters.

6. In Paragraph 4, Frictional penetration fastening member (10) characterized in that the outer thread forming portion (131a) and the outer thread fastening portion (133a) have different thread widths.

7. In Paragraph 5, A frictional penetration fastening member (10) characterized in that the thread height of the outer thread forming portion (131a) is lower than the thread height of the outer thread fastening portion (133a).

8. In Paragraph 4, The lengths of the threading base portion (135) and the threading fastening portion (133) are as follows: Frictional penetration fastening member (10) characterized by being longer than one side of a plurality of plate members and the length of a plurality of plate members funnel.

9. In Paragraph 4, Frictional penetration fastening member (10) characterized in that the cross-sectional shape of the threading forming portion (131) and the threading fastening portion (133) is rounded polygonal.

10. In Paragraph 4, The threading unit (13) above A frictional penetration fastening member (10) characterized by being tapered along the longitudinal direction from the threading forming portion (131) toward the threading fastening portion (133).

11. In Paragraph 10, Frictional penetration fastening member (10) characterized in that at least a portion of the outer thread (13a) is a rounded thread.

12. In Paragraph 3, A frictional penetration fastening member (10) characterized in that at least a portion of the cross-sectional shape of the above penetration portion (11) is a rounded rectangular shape.

13. In Paragraph 3, A frictional penetration fastening member (10) characterized in that the length of the threading base portion (135) and the threading fastening portion (133) is longer than the length of one side of the plurality of plates and the plurality of plates funnel.

14. In Paragraph 1, Frictional penetration fastening member (10), characterized in that the fastening head (15) has a fastening head cavity (153) that forms an internal cavity when in contact with a plurality of plate materials on the bottom surface facing the threading part (13).

15. In Paragraph 14, A frictional penetration fastening member (10) characterized by having a fastening head cavity line (1531) that partitions the fastening head cavity (153) inside the fastening head cavity (153).

16. In Paragraph 15, The above-mentioned fastening head cavity line (1531) is, A frictional penetration fastening member (10) characterized by being radially arranged from the threading part (13) when projected onto a plane perpendicular to the longitudinal direction of the penetration part (11) and the threading part (13).

17. In Paragraph 15, The above-mentioned fastening head cavity line (1531) is, A frictional penetration fastening member (10) characterized by being curved spirally arranged from the threading part (13) toward the outer circumference of the fastening head (15) when projected onto a plane perpendicular to the longitudinal direction of the penetration part (11) and the threading part (13).

18. In Paragraph 14, At least a portion of the above-mentioned fastening head cavity (153) is, A frictional penetration fastening member (10) characterized by having a cavity distance reduction part (Acd) in which the cavity distance (dc) between the inner side forming the fastening head cavity (153) and one side of the multiple plates decreases as it moves in the radial direction when mounting multiple plates.

19. In Paragraph 14, At least a portion of the above-mentioned fastening head cavity (153) is, A frictional penetration fastening member (10) characterized by having a cavity distance increasing portion (Aci) in which the cavity distance (dc) between the inner side forming the fastening head cavity (153) and one side of the multiple plates increases as it moves in the radial direction when multiple plates are mounted.

20. In Paragraph 1, The frictional penetration fastening member (10) is characterized by the above-mentioned fastening head (15) including a head serration (151a) formed on the contact surface with the plate material, which protrudes or grooves.

21. In Paragraph 20, The above head serration (151a) is characterized by having a different angle of inclination with respect to the direction of rotation, in a frictional penetration fastening member (10).

22. In Paragraph 20, The above head serration (151a) is characterized by forming a swirling arrangement structure with respect to the rotational direction, in a frictional penetration fastening member (10).

23. In Paragraph 1, Frictional penetration fastening member (10) characterized in that at least a portion of the outer surface of the above penetration portion (11) forms a cycloid curve.

24. In Paragraph 1, A frictional penetration fastening member (10) characterized in that at least a portion of the outer thread (13a) of the threading portion (13) has a different thread angle along the length of the threading portion (13).

25. Multiple plates (L) and, A frictional penetration fastening member module (1) comprising a frictional penetration fastening member that enables mutual fastening of multiple plates by forming a material softening state using frictional heat generated by high-speed rotation, the frictional penetration fastening member (10) comprising a penetration portion (11) that is positioned through through friction with multiple plates, a threading portion (13) that is connected to the end of the penetration portion (11) and has an outer thread (13a) that forms and fastens screw threads on the inner surface of the penetration hole of multiple plates, and a fastening head (15) connected to the end of the threading portion (13), wherein the cross-sections of the penetration portion (11) and the threading portion (13) respectively have different shapes.

26. In Paragraph 25, The threading unit (13) above is: A threading forming portion (131) connected to the penetration portion (11) and in which at least a portion of the outer thread (13a) begins to be formed in the direction of the fastening head (15), and The threading base part (135) connected to the above-mentioned fastening head (15) It includes a threading fastening portion (133) disposed between the threading forming portion (131) and the threading base portion (135), wherein at least another part of the outer thread (13a) is formed toward the threading base portion (135). When the thickness of the upper plate among the above multiple plates is S1 and the thickness of the lower plate is S2, between the effective thread length (b), which is the length of the threading base part (135) and the threading fastening part (133), and the length between one side of the multiple plates and the multiple plate funnel length (S3), A relationship is formed, A frictional penetration fastening member module (1) characterized in that the thickness (S2) of the lower plate (L2) and the thickness (S3) from the bottom surface of the lower funnel formed on the bottom side plate (L2) have a thickness ratio (S2 / S3) of 0.67 to 1.3.

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