KR101994154B1 - Nut joint structure and manufacturing method of the same - Google Patents

Abstract

A nut joint structure is disclosed. The disclosed nut joint structure comprises: i) a screw tab formed on an inner circumferential surface thereof, ribs spaced at a predetermined interval along the circumferential direction are formed so as to protrude to the outer circumferential side, and protruding from the ribs to the outer circumferential side of the upper portion, And ii) a plate member which is plastically deformed at an edge portion of the processing hole through which the upper portion of the nut passes, the edge portion of which supports the lower portion of the nut and is fixed to the ribs and the support end have.

Description

Technical Field [0001] The present invention relates to a nut fastening structure and a method of manufacturing the same,

An embodiment of the present invention relates to a nut joint structure, and more particularly, to a nut joint structure in which a nut is joined to a plate member by a mechanical coupling method, and a manufacturing method thereof.

In general, various connecting means are used at the connecting parts to be connected to each other to connect or combine different components from automobile parts, parts of various industrial machines, and home appliances. Particularly, The main part is mainly a mechanical coupling method in which bolts and nuts are combined.

As an example of such a mechanical coupling method, there is a welded nut type mounting structure in which a welded nut is formed on one component and the other component is fastened to the welded nut through a bolt.

However, it is difficult to control the welding conditions such as the shape of the current-carrying surface, the current-carrying current, the voltage value, and the pressing force, and it is difficult to control the welding conditions between the nut and the plate material There is a problem in durability due to welding defects or corrosion caused by the welding.

In recent years, it has been required to develop a sheet material integral type nut for use in a thickening method in which a nut and a sheet material are integrally formed. However, it is difficult to integrally form a nut in a sheet material of a thin plate, and the forming process is complicated, which may lead to a decrease in productivity.

The matters described in the background section are intended to enhance the understanding of the background of the invention and may include matters not previously known to those skilled in the art.

Embodiments of the present invention provide a nut joint structure in which a nut and a plate material are joined by a mechanical coupling method, and a manufacturing method thereof.

The nut joint structure according to the embodiment of the present invention is characterized in that: (i) screw tabs are formed on the inner peripheral surface and ribs spaced apart at predetermined intervals along the circumferential direction are formed so as to protrude to the outer periphery, A nut for forming a supporting end protruding to the outer peripheral side of the upper portion with a stepped portion; ii) an edge portion of the processing hole through which the upper portion of the nut passes is plastically deformed to support the lower portion of the nut, And a plate fixed to the supporting end.

Further, in the nut joint structure according to an embodiment of the present invention, the nut may be formed such that the ribs protrude downward from the support end, and the edge of the work hole can be fixed between the protruding end and the bottom of the rib have.

Further, in the nut joint structure according to the embodiment of the present invention, the nut may fix the edge of the machining hole to the support end between the ribs.

Further, in the nut joint structure according to the embodiment of the present invention, the ribs may be formed to protrude toward the outer periphery of the support end.

Further, in the nut joint structure according to an embodiment of the present invention, the nut has the ribs and the supporting end on the circular outer circumferential surface on the upper side, passes through the machining hole of the plate material, And a body portion which is connected to the head portion with the projecting end and the support end interposed therebetween and is engaged with the edge portion of the processing hole through the projecting end and the support end can do.

In addition, in the nut joint structure according to the embodiment of the present invention, the head portion and the body portion may be formed such that their cross-sectional thickness gradually increases from the upper side to the lower side.

Further, in the nut joint structure according to an embodiment of the present invention, the rib may have a triangular cross-sectional shape in which the cross-sectional thickness gradually increases from the upper end surface of the head portion toward the lower side.

In addition, in the nut joint structure according to the embodiment of the present invention, the support end may be formed between the ribs with a vertical height difference from the ribs.

In addition, in the nut joint structure according to the embodiment of the present invention, the support end may be formed between the ribs with a thickness difference from the ribs.

Further, in the nut joint structure according to the embodiment of the present invention, the edge portion of the machining hole is plastically deformed to the outside of the edge by the head portion, and the edge portion of the machining hole plastically deformed to the outside of the edge by the head portion The edge portion is plastically deformed to the inside of the edge by the punch, and the edge of the processing hole can be engaged with the projecting end and the supporting end.

In addition, in the nut joint structure according to the embodiment of the present invention, the plate may form an undercut between the protruding end and the supporting end.

In addition, in the nut joint structure according to the embodiment of the present invention, the edge portion of the processing hole may be formed as a forming portion that supports the body portion and forms the same surface as the outer peripheral surface of the supporting end.

Further, in the nut joint structure according to an embodiment of the present invention, the forming section may form an inclined surface which protrudes upward from the upper surface of the plate member and extends from the outer circumferential surface of the support end.

The method of manufacturing a nut joint structure according to an embodiment of the present invention as described above may include the steps of (a) forming a machining hole in the plate material, (b) inserting the nut through the lower punch, (C) drawing the edge portion of the machining hole through the head portion of the nut passing through the machining hole, (c) holding the edge portion of the machining hole through the body portion of the nut, And pressing the edge portion of the processing hole to fix the edge of the processing hole to the ribs and the supporting end between the head portion and the body portion.

In addition, in the method of manufacturing a nut joint structure according to an embodiment of the present invention, in the step (b), the edge portion of the processing hole may be plastically deformed to the outside of the edge by the ribs and the supporting end of the head portion.

Further, in the method of manufacturing a nut joint structure according to an embodiment of the present invention, in the step (c), the edge portion of the processing hole may be pressed and plastically deformed through the upper punch to the inside of the edge thereof.

Further, in the method of manufacturing a nut joint structure according to an embodiment of the present invention, in the step (c), a forming section having an inclined surface contiguous to the outer peripheral surface of the support end of the head section and supporting the body section is formed on the upper surface of the plate .

According to another aspect of the present invention, there is provided a nut joint structure including: a nut having a screw tab formed on an inner peripheral surface thereof and forming a flange groove in a circumferential direction between an upper portion and a lower portion; The edge of the through hole may be plastically deformed to support the lower portion of the nut and the edge of the hole may be fixed to the flange groove.

According to another aspect of the present invention, there is provided a nut joint structure, wherein the nut has a circular outer circumferential surface, a head part forming a flange protruding to the outer circumferential side along the front circumferential direction of the upper part, And a body portion connected to the head portion through the flange groove and coupled with an edge portion of the processing hole through the flange groove.

In addition, in the nut joint structure according to another embodiment of the present invention, the head portion may have a thickness gradually increasing from the upper side to the lower side.

In addition, in the nut joint structure according to another embodiment of the present invention, the body may be formed to have a thickness gradually increasing from the flange groove toward the lower side.

Further, in the nut joint structure according to another embodiment of the present invention, the plate member may form an undercut in the flange groove.

The embodiment of the present invention can solve the problem of durability due to weld defect and corrosion due to the welding method of the related art by bonding the nut and the plate material in a mechanical coupling manner and it is possible to improve the joint rigidity of the nut and plate material, It is possible to improve the bonding quality of the plate material.

In addition, in the embodiment of the present invention, since the nut and the plate material can be joined by a single upper and lower punching process in a mechanical coupling manner, the work process can be reduced as compared with the conventional method of growing, The productivity can be improved.

In addition, effects obtainable or predicted by the embodiments of the present invention will be directly or implicitly disclosed in the detailed description of the embodiments of the present invention. That is, various effects to be predicted according to the embodiment of the present invention will be disclosed in the detailed description to be described later.

These drawings are for the purpose of describing an exemplary embodiment of the present invention, and therefore the technical idea of the present invention should not be construed as being limited to the accompanying drawings.
1 is a front view showing a nut joint structure according to an embodiment of the present invention.
2 is a plan view of a nut joint structure according to an embodiment of the present invention.
3 is a cross-sectional view taken along line AA in Fig.
4 and 5 are views showing a nut applied to the nut joint structure according to the embodiment of the present invention.
6 to 8 are views for explaining a method of manufacturing a nut joint structure according to an embodiment of the present invention.
9 is an exploded perspective view illustrating a nut joint structure according to another embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

In the following detailed description, the names of components are categorized into the first, second, and so on in order to distinguish them from each other in the same relationship, and are not necessarily limited to the order in the following description.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

Also, the terms " part, "" means," and the like, which are described in the specification, refer to a unit of a comprehensive configuration that performs at least one function or operation.

FIG. 1 is a front view of a nut joint structure according to an embodiment of the present invention, FIG. 2 is a plan view of a nut joint structure according to an embodiment of the present invention, and FIG. Fig.

1 to 3, a nut joint structure 100 according to an embodiment of the present invention includes a nut 10 and a plate member 50. The nut member 10 is mechanically coupled to the plate member 50, As shown in FIG.

For example, the nut joint structure 100 is a mounting structure for fastening one side component to one side component and fastening the other side component as a bolt. The nut structure 100 includes a body member such as a body member and a body frame, and a design component such as a suspension system For assembling to the vehicle body.

However, it should be understood that the protection scope of the present invention is not necessarily limited to assembling a design part such as a body part and suspension system to a vehicle body, and it is also possible to use various types and applications of fastening predetermined parts through bolts and nuts The technical idea of the present invention can be applied to the structure.

Hereinafter, the nut 10 is bonded to the upper surface side of the plate member 50 in a mechanical coupling manner. The upper portion may be defined as an upper portion, an upper portion, an upper end portion, Can be defined as a lower portion, a lower portion, a lower portion, a lower end face, and a lower face.

The above definition of the direction is relative to the reference position of the plate material 50 and the direction of engagement of the nut 10 and the like, so that the above-mentioned reference direction is necessarily limited to the reference direction of this embodiment no.

4 and 5 are views showing a nut applied to the nut joint structure according to the embodiment of the present invention.

4 and 5 together with FIGS. 1 and 3, in the embodiment of the present invention, the nut 10 includes a head portion 21 as an upper portion, a body portion 31 as a lower portion, .

The head portion 21 penetrates the machined machining hole 51 (also referred to as "free hole" in the art) of the plate material 50 and draws the edge portion of the machining hole 51. The head portion 21 is formed such that its cross-sectional thickness gradually increases from the upper side to the lower side of the nut 10.

The head portion 21 has a circular outer periphery at the upper end and a screw tab 11 at its inner periphery. The head portion 21 has ribs 12 spaced at regular intervals along the circumferential direction on the outer circumferential surface to protrude toward the outer circumference. The head portion 21 forms a support end 15 protruding to the outer periphery with a step difference from the body portion 31 between the ribs 12.

The ribs 12 of the head portion 21 are formed to protrude toward the outer circumferential side of the support end 15 and partially protrude downward from the support end 15. The protruding end of the rib 12 13 fixes the edge of the machining hole 51 in the area between itself and the body 31. [ The ribs 12 have a triangular cross-sectional shape in which the cross-sectional thickness gradually increases toward the lower side from the upper end surface of the head portion 21.

The supporting end 15 fixes the edge of the processing hole 51 between the ribs 12 and protrudes downward from the supporting end 15 so that the ribs 12 and the upper and lower ends And may be provided between the ribs 12 with a height difference therebetween. The support end 15 may be provided between the ribs 12 with a thickness difference from the rib 12 as the ribs 12 are formed to protrude toward the outer circumferential side of the support end 15. [

The body portion 31 forms a circular outer circumferential surface and is connected to the head portion 21 with the projecting end 13 of the ribs 12 and the support end 15 interposed therebetween. The body 31 is engaged with the edge of the processing hole 51 through the projecting end 13 and the supporting end 15 of the head 21. The body portion 31 has a shape in which the cross-sectional thickness gradually increases from the support end 15 toward the lower side.

In the embodiment of the present invention, the plate member 50 is joined to the nut 10 in a mechanical coupling manner. The plate member 50 may include a bracket plate joined to a predetermined part, and may include a plate member such as a body panel. have. And the plate 50 may comprise a thin plate or a thick plate that can be mechanically engaged with the nut 10 through the above-mentioned processing hole 51. [

Further, the plate member 50 may include a metal sheet material such as a steel sheet and an aluminum sheet, and may include a non-metallic sheet such as a plastic composite material.

The plate member 50 is formed by plastic deformation of the edge portion of the machining hole 51 through which the head portion 21 of the nut 10 penetrates and supports the body portion 31 of the nut 10, 51 are fixed to the ribs 12 and the supporting end 15 of the head portion 21. [

Specifically, in the plate member 50, the edge portion of the machining hole 51 is plastically deformed to the outside of the edge by the head portion 21 and the machining hole 51 plastically deformed to the outside of the edge by the head portion 21 And the edge of the machining hole 51 is fixed to the support end 15 between the projecting end 13 of the head part 21 and the body part 31 and fixed to the support end 15 by the punch. .

The plate member 50 as described above is formed in such a manner that the edge of the processing hole 51 is fixed to the head portion 21 through the projecting end 13 and the support end 15, And an undercut 55 is formed between the stages 15.

The edge portion of the processing hole 51 of the plate member 50 is formed as a forming portion 61 that supports the body portion 31 and forms the same surface as the outer peripheral surface of the supporting end 15 of the head portion 21. [ do. The forming section 61 forms an inclined surface 63 projecting upward from the upper surface of the plate member 50 and continuing to the outer peripheral surface of the supporting end 15.

Hereinafter, a method of manufacturing the nut joint structure 100 according to the embodiment of the present invention will be described in detail with reference to the accompanying drawings.

6 to 8 are views for explaining a method of manufacturing a nut joint structure according to an embodiment of the present invention.

6, a nut 10 having the head portion 21 and the body portion 31 as described above is provided in the embodiment of the present invention, and a plate material (for example, 50). In the embodiment of the present invention, the edge portion of the plate material 50 is fixed by the upper holder 101 and the lower holder 103. [

7, the nut 10 is punched through the lower punch 201 from the lower side of the plate material 50 into the processing hole 51. As shown in FIG. In this process, the edge portion of the machining hole 51 is drawn through the head portion 21 of the nut 10 passing through the machining hole 51, and the ribs 12 of the head portion 21 and the support The edge portion of the processing hole 51 is plastically deformed to the outside of the edge by the step (15). At this time, the edge portion of the processing hole 51 is retained in the body portion 31 of the nut 10 and supports the outer peripheral surface of the body portion 31.

At the same time, in the embodiment of the present invention, in a state in which the edge portion of the machining hole 51 is supported through the body portion 31 of the nut 10, the upper punch 203 is lowered And the edge portion of the machining hole 51 is squeezed through the upper punch 203.

The edge portion of the processing hole 51 is pressed and plastically deformed to the inside of the edge through the upper punch 203 so that the ribs 12 between the head portion 21 and the body portion 31, And the edge of the machining hole 51 is fixed to the step (15). The edge of the machining hole 51 can be fixed between the projecting end 13 of the ribs 12 and the body 31 and at the support end 15 thereof.

Specifically, in the above process, the edge portion of the machining hole 51 is pressed to the inside of the edge through the upper punch 203, so that a portion corresponding to the ribs 12 at the edge of the machining hole 51 protrudes And is fixed between the projecting end 13 and the body part 31. A portion corresponding to the support end 15 is introduced into the ribs 12 and the support end 15 . At this time, in the state where the edge of the processing hole 51 is fixed to the protruding end 13 and the supporting end 15 of the ribs 12, an undercut (not shown) is formed between the protruding end 13 and the supporting end 15 55) (see Fig. 3).

When the upper punch 203 is moved to the original position in this state, the ribs 12 and the supporting end 15 between the head part 21 and the body part 31 are engaged with the edge of the processing hole 51 The manufacture of the nut joint structure 100 in which the end is fixed is completed (see Fig. 3).

The nut joint structure 100 includes a forming section 61 having an inclined surface 63 extending from the outer peripheral surface of the support end 15 and supporting the body section 31 on the upper surface of the plate member 50 (See FIG. 3).

According to the nut joint structure 100 and the method of manufacturing the same according to the embodiment of the present invention as described above, unlike the welding method and the mass-production method of the related art, the plate member 50 and the nut member 10 It can be bonded in a mechanical coupling manner.

Therefore, in the embodiment of the present invention, since the plate member 50 and the nut 10 are joined by the mechanical coupling method, the problem of durability due to welding defect and corrosion due to the welding method of the related art can be solved, It is possible to improve the bonding quality between the nut 10 and the plate member 50, for example, by enhancing the bonding rigidity of the plate member 50 and the plate member 50.

In addition, in the embodiment of the present invention, since the nut 10 and the plate member 50 can be joined by a single upper and lower punching process in a mechanical coupling manner, the working process can be reduced as compared with the conventional method of growing, Time can be reduced and workability and productivity can be improved.

9 is an exploded perspective view illustrating a nut joint structure according to another embodiment of the present invention.

Referring to FIG. 9, a nut joint structure 200 according to another embodiment of the present invention includes a screw tab 111 formed on an inner peripheral surface thereof, and a flange groove 125 formed in a circumferential direction between an upper portion and a lower portion The nut 110 can be constructed.

The nut joining structure 200 is formed by plastic-deforming the edge of the processing hole 151 through which the upper portion of the nut 110 is passed and supporting the lower portion of the nut 110, And a plate member 150 fixed to the flange groove 125.

In the embodiment of the present invention, the nut 110 includes a head portion 121 as an upper portion and a body portion 131 as a lower portion with reference to the drawing. The head portion 121 has a circular outer circumferential surface and forms a flange 123 protruding toward the outer circumference along the front circumferential direction of the upper portion.

The head portion 121 is provided in a shape that gradually becomes thicker from the upper side to the lower side. The flange 123 forms a skirt-like outer peripheral surface inclined from the upper side to the lower side.

The body portion 131 has a circular outer circumferential surface at its bottom and is connected to the head portion 121 with a flange groove 125 interposed therebetween and through the flange groove 125, (151). The body portion 131 has a thickness gradually increasing from the flange groove 125 toward the lower side.

The flange groove 125 is formed to be connected to the outer peripheral surface of the body part 131 at the lower end of the flange 123 and between the outer peripheral surface of the lower end part of the flange 123 and the outer peripheral surface of the body part 131 .

In the embodiment of the present invention, the edge portion of the processing hole 151 is plastically deformed to the outside of the edge by the head portion 121, and the edge portion thereof is plastically deformed to the inside of the edge by the punch, The edge of the processing hole 151 is engaged with the flange groove 125 between the head part 121 and the body part 131.

The plate member 150 is formed with an undercut 155 in the flange groove 125 as the edge of the processing hole 151 is coupled to the flange groove 125.

The operation and effect of the nut joint structure 200 according to another embodiment of the present invention as described above are the same as those in the previous embodiment, and thus a detailed description thereof will be omitted.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And it goes without saying that the invention belongs to the scope of the invention.

10, 110 ... nut 11, 111 ... screw tab
12 ... rib 13 ... protruding end
15: supporting end 21, 121: head part
31, 131 ... body part 50, 150 ... plate material
51, 151 ... machining holes 55, 155 ... undercut
61 ... forming portion 63 ... inclined surface
100, 200 ... Nut splicing structure 101 ... Upper holder
103 ... lower holder 123 ... flange
125 ... flange groove 201 ... lower punch
203 ... upper punch

Claims (20)

And ribs spaced at regular intervals along the circumferential direction are formed to protrude to the outer circumferential side and a supporting end protruding from the ribs to the outer circumferential side of the upper portion with a lower step is formed nut; And
And a plate member in which an edge portion of the machining hole through which the upper portion of the nut passes is plastically deformed and an edge of the machining hole is fixed to the ribs and the support end,
Wherein the nuts fix the edge of the processing hole to the support end between the ribs and the ribs form a protruding end protruding downward from the support end, The edge of the processing hole is fixed,
Wherein the nut includes a head portion that forms the ribs and the supporting end on a circular outer peripheral surface of the upper portion and penetrates the processing hole of the plate material and draws an edge portion of the processing hole, And a body portion connected to the head portion with the protruding end and the support end interposed therebetween, and coupled with an edge portion of the processing hole through the protruding end and the supporting end,
Wherein the head portion and the body portion are formed such that the thickness of the head portion gradually increases from the upper side to the lower side, and the rib has a triangular cross-sectional shape in which the thickness of the end surface gradually increases from the upper surface of the head portion toward the lower side. Junction structure. delete The method according to claim 1,
And the ribs are formed to protrude toward the outer circumferential side of the support end. delete delete delete The method according to claim 1,
The supporting end may be,
Wherein the ribs are formed between the ribs with a vertical height difference from the ribs. 8. The method of claim 7,
The supporting end may be,
Wherein the ribs are formed between the ribs with a thickness difference from the ribs. The method according to claim 1,
The plate member
The edge portion of the processing hole is plastically deformed to the outside of the edge by the head portion,
The edge portion of the machined hole plastically deformed to the outside of the edge by the head portion is plastically deformed to the inside of the edge by the punch,
And an edge of the machining hole is coupled to the projecting end and the support end. 10. The method of claim 9,
The plate member
And an undercut is formed between the projecting end and the support end. 10. The method of claim 9,
The plate member
And an edge portion of the machining hole is formed as a forming portion that forms the same surface as the outer peripheral surface of the support end and supports the body portion. 12. The method of claim 11,
Wherein the forming unit comprises:
And a sloped surface protruding upward from an upper surface of the plate and continuing from an outer circumferential surface of the support end. delete delete delete delete A method of manufacturing a nut joint structure according to claim 1, comprising a nut and a plate material,
(a) forming a machining hole in the plate material,
(b) punching the nut from the lower side of the plate through the lower punch into the machining hole, drawing an edge portion of the machining hole through the head portion of the nut passing through the machining hole,
(c) pressing the edge portion of the machining hole through the upper punch while the edge portion of the machining hole is supported through the body portion of the nut, so that the ribs between the head portion and the body portion, And a step of fixing the edge portion,
Wherein the nuts fix the edge of the processing hole to the support end between the ribs and the ribs form a protruding end protruding downward from the support end, The edge of the processing hole is fixed,
Wherein the head part forms ribs and a supporting end on a circular outer circumferential surface of the upper part, draws an edge part of the processing hole through the processing hole of the plate material,
Wherein the body portion has a circular outer circumferential surface at the bottom and is connected to the head portion with the protruding end and the support end interposed therebetween and is engaged with the edge portion of the processing hole through the protruding end and the support end,
Wherein the head portion and the body portion have a triangular cross-sectional shape in which the cross-sectional thickness gradually increases from the upper end surface of the head portion toward the lower side,
In the step (b), the edge portion of the processing hole is plastically deformed to the outside of the edge by the ribs and the supporting end of the lower punch and the head,
Wherein the step of (c) compresses the edge portion of the hole through the upper punch and the body to plasticize the inner edge of the hole, and fixes the protrusion to the support end. delete delete 18. The method of claim 17,
In the step (c)
Wherein a forming portion having an inclined surface extending from an outer circumferential surface of the support end of the head portion and supporting the body portion is formed on an upper surface of the plate member.

Images