KR102094175B1 - Self piercing clinching net - Google Patents

Abstract

Self-piercing clinching nuts are disclosed.
The self-piercing clinching nut according to an embodiment of the present invention has a cylindrical shape in which a screw tab is formed on the inner circumferential surface of a hole, and a plurality of interlock grooves are formed on the outer circumferential surface of one end of the body and fastened to the base material. It includes a clinching joint formed with a blade piercing the base material by a certain inclined surface.

Description

Self Piercing Clinching Nut {SELF PIERCING CLINCHING NET}

The present invention relates to a self-piercing clinching nut, and more particularly, to a self-piercing clinching nut that is simultaneously clinched while piercing a base material with an external pressing force.

In general, in a factory that mass-produces iron parts applied to a vehicle body, a process of joining a plurality of panels is applied, and representatively, welding, riveting, bolting and bonding methods using a clinching nut, etc. Is being applied.

Among them, the joining method using the clinching nut is a method in which a hole is formed by drilling a hole in a base material (panel), a hole is formed on the clinching nut seated on the die, and then press-fitting is performed to fasten the hole. Is being used. At this time, the press-in uses the reversing force of the base material, which is a metal material having a lower hardness than the clinching nut, to be crushed.

However, in the case of a joining method using a conventional clinching nut, there is a disadvantage in that a drilling process for drilling a hole in the target panel is added, which requires a lot of effort and time for the fastening operation.

Meanwhile, a piercing nut has been developed to solve the disadvantages of the conventional clinching nut.

For example, FIG. 1 is a partial cross-sectional view schematically showing the configuration of a conventional piercing nut and its fastening structure.

Referring to the attached Figure 1, the conventional piercing nut 1 is pushed through the rivet groove 2 at the same time as the piercing through the pressing of the upper die (not shown) and the lower die in the state of being placed in the bonding position of the base material. It is a way of bonding. The piercing nut 1 is formed with a screw tab 3 at the center and a piercing blade 4 for penetrating a portion of the base material on one surface.

However, the conventional piercing nut 1 is applicable to a thin plate, but its use is limited because it is an unfavorable bonding method in terms of bonding strength in a high-strength extrusion or die-casting product having a thickness of 2.0 mm or more.

On the other hand, Figure 2 shows the process of fastening the pipe nut to the closed section base material applied to the conventional vehicle body.

Referring to the attached FIG. 2, in the case of a conventional aluminum extruded product or a roll-form closed cross-section base material, after molding with a linear agent (S1), a hole (H) is processed in the base material (S2), and a processed hole (H) To the pipe nut (5) by fastening (S3), the process of welding (W) to the fastening site (S4) was performed.

In the case of a product applied to a vehicle body or a bumper, since a high-strength product having a thickness of 2.0 mm or more is used for rigidity, the use of the piercing nut 1 is limited. That is, there is a disadvantage in that a hole processing process for inserting the pipe nut and a welding process are required to join the pipe nut and the base material even after the hole processing, so that a lot of labor and time are required for fastening.

Therefore, there is an urgent need for the development of a new concept piercing nut that can be fastened with excellent bonding strength to a prototype having a thickness of 2.0 mm or more in addition to a conventional thin plate.

The items described in this background section are written to improve the understanding of the background of the invention, and may include matters not known in the prior art that are already known to those skilled in the art.

An object of the present invention is to provide a self-piercing clinching nut capable of simultaneously improving strength of joint strength and rotational torque by designing the base material to be pierced and joined at the same time.

In addition, another object of the present invention is to provide a self-piercing clinching nut that is designed to be capable of simultaneously piercing and joining a base material in the upper and lower parts of a long pipe type body, which can be simply fastened to the base material in a roll forming process. .

According to one aspect of the present invention, the self-piercing clinching nut has a cylindrical shape in which a screw tab is formed on the inner circumferential surface of the hole, and a plurality of interlock grooves are formed on the outer circumferential surface of one end of the body and fastened to the base material to form a tip. Includes a clinching joint having a blade piercing the base material by a certain inclined surface.

In addition, the plurality of interlock grooves may be formed as grooves forming an undercut between the base material and a circumference on an outer circumferential surface of which the diameter of the body is reduced toward the tip end.

In addition, the plurality of interlock grooves may be formed of a first undercut groove formed along a circumference on the outer circumferential surface and a second undercut groove formed along a circumference on the outer circumferential surface adjacent to the first undercut groove.

In addition, the blade may be formed to have the same size as the inner diameter of the blade portion blade diameter.

In addition, the body may be formed with a screw tab on the inner circumferential surface excluding the clinching joint.

In addition, the body may further include a stopper protruding in the fastening direction with the base material along the perimeter of the boundary of the clinching joint.

In addition, the stopper may be formed to protrude sharply toward the fastening direction with the base material.

In addition, the stopper may be formed in plurality at regular intervals along the perimeter of the boundary of the clinching joint.

On the other hand, according to another aspect of the present invention, the self-piercing clinching nut has a cylindrical shape in which a screw tab is formed on the inner circumferential surface of the hole and a plurality of inters that are fastened by digging into the base material on the outer circumferential surfaces of one end and the other end of the body. A lock groove is formed, and each tip of the one end portion and the other end portion includes a clinching joint having a blade piercing the base material by a predetermined inclined surface.

In addition, the plurality of interlock grooves may be formed of grooves that form an undercut between the base material and around the outer circumferential surface of which the diameter is reduced toward the front end, respectively, at one end and the other end of the body.

In addition, the plurality of interlock grooves may be formed of a first undercut groove formed along a circumference on each outer circumferential surface, and a second undercut groove formed along a circumference on each outer circumferential surface adjacent to the first undercut groove.

In addition, each blade of the one end portion and the other end portion may be formed to have the same size as the inner diameter of each blade portion.

In addition, the body may be formed with a screw tab on an inner circumferential surface excluding each of the clinched joints of the one end and the other end.

In addition, the body may further include a stopper protruding in the fastening direction with the base material along the perimeter of each of the clinched joints of the one end and the other end.

In addition, the stopper may be sharply formed in the form of a triangular cross section toward the fastening direction with the base material.

In addition, the body may further include a support end that protrudes along the circumference of the center of the outer circumferential surface and is supported by the pressing tool.

According to an embodiment of the present invention, a blade and a clinching joint are formed, and at the same time as the base material is pierced, it can be interlocked to improve the bonding strength with the base material, and fixed to the base material by an anti-rotation stopper to rotate torque after bonding. There is an effect that can prevent rotation by.

In addition, a blade, a double-clinching interlock structure, a clinching joint and an anti-rotation stopper are respectively formed on the upper and lower parts of the body in the form of a long pipe, so that they can be simply fastened to the base material during the roll forming process.

1 is a partial cross-sectional view schematically showing the configuration of a conventional piercing nut and its fastening structure.
2 shows a process of fastening a pipe nut to a closed cross-section base material applied to a conventional vehicle body.
3 is a perspective view showing the configuration of a self-piercing clinching nut according to a first embodiment of the present invention.
4 is a sectional perspective view of a self-piercing clinching nut according to a first embodiment of the present invention.
5 is a cross-sectional view showing a self-piercing clinching nut according to a first embodiment of the present invention coupled to a base material.
6 is a perspective view showing the configuration of a self-piercing clinching nut according to a second embodiment of the present invention.
7 is a sectional view showing a self-piercing clinching nut according to a second embodiment of the present invention.
8 is a cross-sectional view showing a self-piercing clinching nut according to a second embodiment of the present invention coupled to a closed cross-section base material.
9 shows a method of fastening a self-piercing clinching nut to a closed end surface base material through a roll forming process according to a second embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains may easily practice. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. In addition, in order to clearly describe the present invention in the drawings, parts irrelevant to the description are omitted, and like reference numerals are assigned to similar parts throughout the specification.

Throughout the specification, when a part “includes” a certain component, it means that the component may further include other components, not to exclude other components, unless otherwise stated. In addition, terms such as “… unit”, “… group”, and “module” described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. have.

Now, a self-piercing clinching nut according to an embodiment of the present invention will be described in detail with reference to the drawings.

[First Embodiment]

3 is a perspective view showing the configuration of a self-piercing clinching nut according to a first embodiment of the present invention.

4 is a sectional perspective view of a self-piercing clinching nut according to a first embodiment of the present invention.

5 is a cross-sectional view showing a self-piercing clinching nut according to a first embodiment of the present invention coupled to a base material.

3 to 5, the self-piercing clinching nut 100 according to an embodiment of the present invention includes a body 110, a clinching joint 120 and an anti-rotation stopper at one end of the body 110 130 is integrally configured.

The body 110 has a cylindrical shape, and a screw tap of a certain depth is formed on the inner circumferential surface of the hole 111. The hole 111 on which the screw tab is formed may be fastened by bolting with another member in a state where the self-piercing clinching nut 100 is bonded to the base material.

The clinching joint 120 is formed on the outer circumferential surface of one end of the body 110 to form a plurality of interlock grooves that are fastened into the base material, and the front end has a blade 123 piercing the base material by a certain inclined surface. Is formed.

Here, the plurality of interlock grooves are the first undercut groove 121 formed along the circumference on one outer circumferential surface of the body 110 and the second formed along the circumference on the outer circumferential surface adjacent to the first undercut groove 121. It consists of an undercut groove 122.

The clinching joint 120 is double-interlocked while the base material is pressed into the first undercut groove 121 and the second undercut groove 122 so as not to be separated in the opposite direction of the fastening direction.

The blade 123 is formed with a circular cutter at the lower end of the clinching joint 120 to pierce the base material by external pressure to form the base material hole H.

At this time, the diameter of the blade 123 blade portion may be formed in the same size as the inner diameter of the hole 111 on which the screw tab is formed.

When such, the clinching joint 120 is inserted into the base material hole H formed by the blade 123 under an external pressing force, the base material hole in the first undercut groove 121 and the second undercut groove 122 under the pressing force It is possible to improve the bonding strength by the double-clinching interlock in which the inner circumferential surface of (H) is pressed.

In addition, the height of the clinching joint 120 is configured to be the same as the thickness of the base material, and can be manufactured by standardizing to the thickness of the base material used.

On the other hand, the body 110, the screw tab is formed only on the inner circumferential surface of the hole 111 except for the clinching joint 120. That is, the screw tab is omitted on the inner circumferential surface of the hole 111 in which the clinching joint 120 is formed, thereby facilitating piercing of the blade 123 and preventing the screw tab from being damaged by the cut base material piece.

Therefore, there is an effect applicable to a base material made of various thicknesses of 2.0 mm or more by high-strength extrusion or die casting.

The anti-rotation stopper 130 protrudes from one end of the body 110 toward the base material, and may be formed at regular intervals along the bottom edge of the body 110 where the clinching joint 120 starts.

At this time, the anti-rotation stopper 130 may protrude in an inverted triangular cross-sectional shape.

The anti-rotation stopper 130 is inserted into the upper surface of the base material centering on the base material hole H by the external pressure when the self-piercing clinching nut 100 is joined, and then the self-piercing clinching nut 100 is joined. It is firmly fixed so as not to be rotated by an external rotating torque (eg, bolting connection).

For example, four anti-rotation stoppers 130 may be arranged at regular intervals, as shown in FIG. 3, but the number is not limited thereto, and may be further increased or decreased.

On the other hand, referring to the attached Figure 4, the above-described self-piercing clinching nut 100 pierces the base material through the blade 123 under the pressing force of the upper die D1 and the lower die D2, and at the same time, the clinching joint. It can be interlocked double by 120 to be firmly bonded to the base material.

At this time, the upper die (D1) and the lower die (D2) are respectively installed on the upper and lower parts of the C-type frame, one of which can be operated by a press driven by a hydraulic cylinder (not shown).

 [Second embodiment]

On the other hand, the self-piercing clinching nut 100 in the first embodiment of the present invention described above was described as having a clinching joint 120 and a stopper 130 formed at one end of the body 110. However, the present invention is not limited to the above-described first embodiment, and various modifications are possible.

For example, according to the second embodiment of the present invention, the clinching joint 120 and the stopper 130 may be formed on both ends of the body 110, respectively. This will be explained in detail.

6 is a perspective view showing the configuration of a self-piercing clinching nut according to a second embodiment of the present invention.

7 is a sectional view showing a self-piercing clinching nut according to a second embodiment of the present invention.

8 is a cross-sectional view showing a self-piercing clinching nut according to a second embodiment of the present invention coupled to a closed cross-section base material.

6 to 8, the configuration of the self-piercing clinching nut 100 'according to the second embodiment of the present invention is similar to the configuration of the self-piercing clinching nut 100 of the first embodiment described above. Therefore, the same reference numerals are used, and duplicate descriptions will be omitted and the description will focus on other parts.

The self-piercing clinching nut 100 'includes a clinching joint 120 and a stopper 130 formed at one end and the other end of the body 110, respectively.

In other words, a plurality of interlock grooves are formed on the outer circumferential surfaces of the body 110 and the one end and the other end of the body 110 in which a screw tab is formed on the inner circumferential surface of the hole in a cylindrical shape. Each tip of the part and the other end is a clinching joint 120 having a blade 123 piercing the base material by a certain inclined surface, and a stopper protruding in the fastening direction with the base material along the perimeter of the border of each clinching joint ( 130).

In addition, the body 110 may be formed to extend in the form of a long pipe, and protrude along the outer circumferential surface of the center of the body 110 to form a support end 140 through which the pressure of the pressing tool D1 is transmitted.

The self-piercing clinching nut 100 ′ may be damaged when the upper surface is pressed through the press due to the characteristics of the blades 123 formed at both ends.

Therefore, a cylindrical groove is formed inwardly in the center of the lower surface of the pressing tool D1, and through the support end 140 in a state where a part of the body 110 of the self-piercing clinching nut 100 'is inserted into the cylindrical groove. Pressure for bonding (fastening) can be delivered (see FIG. 9).

The self-piercing clinching nut 100 ′ may be simultaneously pierced and pierce each base material as shown in FIG. 8 through a double clinching bonding structure formed on the upper and lower parts.

On the other hand, Figure 9 shows a method for fastening the self-piercing clinching nut to the closed end base material through the roll forming process according to the second embodiment of the present invention.

Referring to the attached FIG. 9, a process of fastening a self-piercing clinching nut 100 'having a long pipe structure during a process of manufacturing a closed cross-section product by inserting an aluminum base material into a roll forming equipment (not shown) is shown.

First, a base material of a flat aluminum material is introduced into a roll forming process (S11).

Next, the base material is bent by the first roll forming process (RF # 1) and the second roll forming process (RF # 2) through the roll forming equipment, and the self-piercing clinching nut 100 'is positioned on the upper surface of the base material. After the pressure is applied through the pressing tool D1, a double clinching bonding structure formed on the lower portion of the body 110 is first bonded to the base material (S12). At this time, the pressing force of the pressing tool D1 is transmitted to the support end 140 formed in the center of the body 110.

Next, the base material is bent by a third roll forming process (RF # 3) through a roll forming equipment to form a closed square section (S13). At this time, by applying pressure to the base material in contact with the upper surface of the self-piercing clinching nut 100 ', a double clinching bonding structure formed on the upper portion of the body 110 is secondly joined to the base material (S14).

As described above, according to an embodiment of the present invention, a blade and a clinching joint are formed, and at the same time as the piercing of the base material, it is interlocked to double to improve the bonding strength with the base material. There is an effect that can prevent the rotation by the rotation torque.

In addition, a blade, a double-clinching interlock structure, and a rotating stopper are respectively configured at the upper and lower parts of the body in the form of a long pipe to effectively fasten to the base material during the roll forming process.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concept of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

100: self-piercing clinching nut
110: body
111: bolt hole
120: clinching joint
121: first undercut groove
122: second undercut groove
123: blade
130: stopper
140: support

Claims (16)

A body in which a screw tab is formed on the inner circumferential surface of the hole in a cylindrical shape; And
A plurality of interlock grooves are formed on the outer circumferential surface of one end of the body and fastened by entering into the base material, and the tip includes a clinching joint formed with a blade piercing the base material by a certain inclined surface.
The blade is formed in the same size as the blade diameter of the blade tab formed in the body portion of the blade diameter,
The plurality of interlock grooves are made of grooves that form an undercut between the base material and a circumference on an inclined outer circumferential surface in which the diameter of one end of the body is reduced to the diameter size of the blade portion of the blade. A self-piercing clinching nut comprising a first undercut groove formed along the circumference of the top and a second undercut groove formed along the circumference on the inclined outer circumferential surface adjacent to the first undercut groove. delete delete delete According to claim 1,
The body
A self-piercing clinching nut having a screw tab formed on an inner circumferential surface excluding the clinching joint. According to claim 1,
The body
A self-piercing clinching nut further comprising a stopper protruding in a fastening direction with the base material along a perimeter of the boundary of the clinching joint. The method of claim 6,
The stopper
A self-piercing clinching nut that is sharply projected toward the fastening direction with the base material. The method of claim 6,
The stopper
A self-piercing clinching nut formed in plurality at regular intervals along the perimeter of the boundary of the clinching joint. A body formed by extending in a pipe shape and having a screw tab formed on an inner circumferential surface of the hole; And
A plurality of interlock grooves are formed on the outer circumferential surfaces of the one end portion and the other end of the body by being dug into and fastened to the base material, and each tip of the one end portion and the other end portion is clean with blades piercing the base material by a certain inclined surface. Ching joint,
The blade is formed to have the same diameter as the blade diameter of the threaded tab formed on the body, and the plurality of interlock grooves are inclined by reducing the diameter of one end of the body to the diameter of the blade of the blade. It has a double clinching interlock structure including a first undercut groove formed along the circumference on the outer circumferential surface and a second undercut groove formed along the circumference on the inclined outer circumference adjacent to the first undercut groove,
After placing the one end of the body on the upper surface of the base material bent by the first roll forming process and the second roll forming process through the roll forming equipment, pressure is applied to the double clinching interlock structure of the one end and the base material is first Through the step of bonding and applying the pressure in the state in which the base material bent in the third roll forming process is in contact with the other end of the body, the second clinching interlock structure of the other end and the base material are joined through the second bonding. Self-piercing clinching nut forming a square closed cross section of the base material. delete delete delete The method of claim 9,
The body
The self-piercing clinching nut is formed on the inner circumferential surface excluding the clinching joints of the one end and the other end. The method of claim 9,
The body
A self-piercing clinching nut further comprising a stopper protruding in a fastening direction with the base material along the perimeter of the boundary of each clinching joint of the one end and the other end. The method of claim 14,
The stopper
A self-piercing clinching nut that is sharply formed in a triangular cross-sectional shape toward the fastening direction with the base material. The method of claim 9,
The body
A self-piercing clinching nut further including a support end projecting along the circumference of the center of the outer circumferential surface and supporting the pressing tool.

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