KR102018959B1 - Clincging device using two step press type - Google Patents

Abstract

The present invention relates to a clinching device having a two-stage indentation structure and a joining method using the clinching device. More specifically, a clinching apparatus for laminating a plurality of dissimilar material thin plate, and then bonding the die, comprising: a die having an insert portion formed at an upper center end thereof; A lower holder positioned on the die and having a mold hole having a diameter smaller than the insertion portion at a central end thereof; An upper holder positioned above the lower holder and having a mold hole formed at a central end thereof; A plurality of dissimilar material thin plates to be joined between the upper holder and the lower holder; And a punch for displacing the dissimilar material thin plate between the upper and lower holders and press-fitting the mold hole and the insertion part to join the dissimilar material thin plate. The first punch in the form of a hollow tube press-fitted into the inserting portion, a plurality of punch protrusions mounted on the lower outer side of the first punch, the inside of the first punch and the inserting portion after the first punch It relates to a clinching device having a two-stage indentation structure comprising a second punch moved to the side to move the plurality of punch projections outward.

Description

Clinching device having a two-stage press-in structure and bonding method using the clinching device {Clincging device using two step press type}

The present invention relates to a clinching device having a two-stage indentation structure and a joining method using the clinching device.

In general, laser welding using a laser beam output from a laser oscillator or electric resistance welding using a spot welder are mainly applied to overlap two metal sheets together in an industrial field.

In general laser welding systems for welding steel sheet material using a laser beam, a laser head is installed at the arm tip of the robot, which is connected to a laser oscillator. The robot is controlled by the robot controller to move the laser head along the welding pattern of the material and to irradiate the laser beam to perform the welding operation.

On the other hand, in recent years, according to the trend of high strength and light weight of the vehicle body, a case of applying a composite plate as well as a metal plate or non-ferrous metal plate material as a body material has been widely applied.

However, these materials are expensive and the raw materials themselves are limited to bonding or mechanical joining methods. Especially, welding between different materials is impossible due to the physical properties of the two materials, but laser welding or spot welding is impossible. Is even more impossible.

Furthermore, in the prior art, when joining different materials by bonding or mechanical joining, the joined body of the different materials can be easily separated in the tensile direction (shear direction).

In addition, the clinching technique may be applied as a mechanical bonding method for dissimilar materials. Figure 1 shows a cross-sectional view of the cleaning device 1 without the consumables using a conventional punch, die, upper holder, lower holder. FIG. 2 illustrates a cross-sectional view of the clinching apparatus in a state in which the punch is press-fitted in FIG.

As shown in FIG. 1 and FIG. 2, it can be seen that the clinching device 1 includes a die 20, an upper holder 31, a lower holder 33, and a punch 10. As shown in FIGS. 1 and 2, the lower holder 33 having the mold hole 34 is positioned on the die 20 having the insertion portion 21 formed thereon, and the heterogeneous material thin plate is formed on the lower holder 33. (4) will be placed. Then, after placing the upper holder 31 having the mold hole 32 formed thereon, a punch is inserted and pressed into the insertion part 21 side of the die 2 to form a press-fitting part on the dissimilar material thin plate.

In other words, this clinching method corresponds to a method of fixing the two materials so as not to fall out to play by joining the different materials. As it is pressed without puncturing, it has the advantage that the number of processes is short and the processing speed is faster as compared with fastening with bolts, etc., and it can be applied to any material.

In other words, the conventional clinching method does not require additional joining elements, is light in weight, eco-friendly, short in processing time, and improves dynamic strength compared to spot welding. There is a disadvantage that can be reduced significantly.

In order to compensate for these disadvantages, as shown in FIGS. 1 and 2, the diameter of the insertion part 21 of the die 20 is larger than the mold holes 32 and 34 of the holders 31 and 33. It can be seen that the expansion portion 36 is formed in the lower outer peripheral portion of (5) to improve the bonding force.

However, in the case of the conventional clinching method, the bonding strength is still only 50 to 70% of spot welding, there is a concern that intensive stress occurs in shape, and it is difficult to apply to high-strength materials, and there is no trace of deformation of the material. There is a problem that there is a possibility of separation between the plates.

Therefore, the development of improved clinching technology to increase the bonding strength of the clinching and solve the concentrated stress was required.

Republic of Korea Patent No. 1304897 Republic of Korea Patent Publication No. 2009-0108693 Republic of Korea Patent No. 0626106

Therefore, the present invention has been made to solve the above conventional problems, according to an embodiment of the present invention, by forming a sufficient extension by forming a protrusion punch once more with the second punch through a two-stage indentation method Clinching device with two-stage indentation structure for joining different material thin plates that can expand the application fields such as automobile parts and home appliance assembly by compensating the disadvantages of the conventional clinching coupling method by increasing the bonding strength of chamfering and solving the concentrated stress And a bonding method using the clinching device.

In addition, according to an embodiment of the present invention, the cost efficiency is better than spot welding, the bonding strength can be increased by about 20% than the conventional clinching coupling method, the process time is faster, the dynamic strength is compared to the spot welding, and the weight is reduced Clinching with two-stage indentation structure that can realize eco-friendliness, do not need additional joining elements, is useful for various material combinations, saves energy, produces no noise during process, and can check the joining quality with the naked eye without product damage. It is an object of the present invention to provide a joining method using the apparatus and the clinching apparatus.

On the other hand, the technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned are clearly to those skilled in the art from the following description. It can be understood.

A first object of the present invention is a clinching apparatus for laminating a plurality of dissimilar material thin plates and then joining them, comprising: a die having an insertion portion formed at an upper center end thereof; A lower holder positioned on the die and having a mold hole having a diameter smaller than the insertion portion at a central end thereof; An upper holder positioned above the lower holder and having a mold hole formed at a central end thereof; A plurality of dissimilar material thin plates to be joined between the upper holder and the lower holder; And a punch for displacing the dissimilar material thin plate between the upper and lower holders and press-fitting the mold hole and the insertion part to join the dissimilar material thin plate. The first punch in the form of a hollow tube press-fitted into the inserting portion, a plurality of punch protrusions mounted on the lower outer side of the first punch, the inside of the first punch and the inserting portion after the first punch It can be achieved as a clinching device having a two-stage indentation structure comprising a second punch moved to the side to move the plurality of punch projections outward.

The first punch includes a body, a press-fit end that is press-fitted and inserted into the mold hole and the inserting part, a locking jaw provided between the body and the press-fit end, and a plurality of projection mounting ends radially formed outside the press-fit end. And each of the punch protrusions may be mounted on the protrusion mounting end.

In addition, the second punch is mounted in the hollow hole of the first punch and provided with a tapered surface outside the lower surface, the punch projection is provided with an outer inclined surface and the inner upper inclined surface in surface contact with the tapered surface, After the first stage press-in by one punch, the second punch is moved to the lower side to move each of the punch projections to the outside may be characterized in that a plurality of expansion parts are formed on the outer peripheral surface of the bottom of the press-in portion of the dissimilar material plate.

And the diameter of the insertion portion of the die may be characterized in that larger than the diameter of the mold hole.

A second object of the present invention is a method for joining a dissimilar material thin plate by using a clinching device having a two-stage indentation structure according to the first object mentioned above, the lower holder having a mold hole on the die having an insertion portion Positioning a second material plate on the lower holder; Positioning an upper holder having a mold hole on the dissimilar material thin plate; And pressing the punch into the mold hole of the upper holder, the lower holder, and the insertion part of the die to form a press-fitting part in the heterogeneous material thin plate; and the joining step includes the first punch of the punch. A first stage indentation step of pressing the bottom surface of the first punch so as to be positioned to a lower end of the insertion part of the die; And a two-stage indentation step of moving the second punch to the lower side to move each of the punch protrusions to the outside to form a plurality of expansion parts on the outer circumferential surface of the bottom of the indentation portion of the dissimilar material plate. It can be achieved as a dissimilar material thin plate bonding method using a clinching device.

According to a clinching apparatus having a two-stage indentation structure and a bonding method using the clinching apparatus according to an embodiment of the present invention, a two-stage indentation method is applied to the second punch once more to form a sufficient extension portion. By increasing the bonding strength of the clinching to solve the concentrated stress to compensate for the shortcomings of the conventional clinching coupling method has the effect of expanding the application field, such as automobile parts and home appliances assembly.

In addition, according to the clinching device having a two-stage indentation structure and the joining method using the clinching device according to an embodiment of the present invention, the cost efficiency is superior to spot welding and the bonding strength is about 20 than the conventional clinching coupling method It can increase by%, process time is fast, dynamic strength compared to spot welding, light weight and eco-friendly can be realized, no additional bonding elements are needed, it is useful for various material combinations, and energy is not generated during the process while saving energy. It also has the advantage that it is possible to check the bonding quality with the naked eye without damaging the product.

On the other hand, the effect obtained in the present invention is not limited to the above-mentioned effects, other effects that are not mentioned will be clearly understood by those skilled in the art from the following description. Could be.

The following drawings, which are attached to this specification, illustrate one preferred embodiment of the present invention, and together with the detailed description thereof, serve to further understand the technical spirit of the present invention. It should not be construed as limited.
1 is a cross-sectional view of a cleaning device without consumables using a conventional punch, die, upper holder, lower holder,
FIG. 2 is a cross-sectional view of the clinching apparatus in a state in which the punch is press-fitted in FIG.
3 is a perspective perspective view of a punch according to an embodiment of the present invention,
Figure 4 is a perspective perspective view of the second punch in the state moved to the lower side in Figure 3,
5 is a cross-sectional view of the pre-stage stage indentation state in a clinching device in an embodiment of the present invention;
6 is a cross-sectional view after the first stage indentation according to the embodiment of the present invention;
Figure 7 shows a cross-sectional view after two-stage indentation according to an embodiment of the present invention.

Objects, other objects, features and advantages of the present invention will be readily understood through the following preferred embodiments associated with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosure may be made thorough and complete, and to fully convey the spirit of the invention to those skilled in the art.

In the present specification, when a component is mentioned to be on another component, it means that it may be formed directly on the other component or a third component may be interposed therebetween. In addition, in the drawings, the thickness of the components are exaggerated for the effective description of the technical content.

Embodiments described herein will be described with reference to cross-sectional and / or plan views, which are ideal exemplary views of the present invention. In the drawings, the thicknesses of films and regions are exaggerated for effective explanation of technical content. Therefore, the shape of the exemplary diagram may be modified by manufacturing techniques and / or tolerances. Accordingly, the embodiments of the present invention are not limited to the specific forms shown, but also include changes in forms generated according to manufacturing processes. For example, the region shown at right angles may be rounded or have a predetermined curvature. Thus, the regions illustrated in the figures have properties, and the shape of the regions illustrated in the figures is intended to illustrate a particular form of region of the device and is not intended to limit the scope of the invention. Although terms such as first and second are used to describe various components in various embodiments of the present specification, these components should not be limited by such terms. These terms are only used to distinguish one component from another. The embodiments described and illustrated herein also include complementary embodiments thereof.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, the words 'comprises' and / or 'comprising' do not exclude the presence or addition of one or more other components.

In describing the specific embodiments below, various specific details are set forth in order to explain the invention more specifically and to help understand. However, those skilled in the art can understand that the present invention can be used without these various specific details. In some cases, it is mentioned in advance that parts of the invention which are commonly known in the description of the invention and which are not highly related to the invention are not described in order to prevent confusion in explaining the invention without cause.

Hereinafter, the structure, function, and bonding method using the clinching device 100 of the clinching device 100 having the two-stage indentation structure according to the embodiment of the present invention will be described.

The clinching apparatus 100 according to the embodiment of the present invention includes a die 20, a holder, and a punch 10, as in the general clinching apparatus 1. The die 20 has an insertion portion 21 formed at an upper center end thereof, and a lower holder 33 is positioned above the die 20, and has a diameter smaller than that of the insertion portion 21 at the center end of the lower holder 20. The mold hole 34 is formed.

The upper holder 31 is positioned on the upper side of the lower holder, and the mold hole 32 is also formed at the center end of the upper holder 31. The heterogeneous material thin plate 4 which is the object of the bonding located between the upper holder 31 and the lower holder 33 is positioned. The heterogeneous material thin plate 4 is formed by stacking a first material thin plate 2 (for example, steel) and a second material thin plate (3, for example, aluminum), and the upper holder 31 and the lower holder 33. It will be placed in between.

Then, after the dissimilar material sheet 4 is positioned between the upper holder 31 and the lower holder, the punch 10 is press-fitted into the mold holes 32 and 34) and the inserting portion 21 so as to disperse the dissimilar material sheet 4. Will be bonded.

3 shows a perspective perspective view of a punch 10 according to an embodiment of the invention. And, Figure 4 shows a perspective perspective view of the second punch 17 is moved to the lower side in FIG. 3 and 4, the punch 10 according to the embodiment of the present invention comprises a first punch 11, the second punch 17 and the punch projection 40 is a two-stage indentation It can be seen that the structure can be realized.

The punch 10 according to the embodiment of the present invention, the first punch 11 and the lower portion of the first punch 11 in the form of a hollow tube that is pressed into the mold holes (32, 34) and the insertion portion 21 side. The plurality of punch protrusions 40 mounted on the outside and the first punch 11 are mounted inside the first punch 11 and are moved to the inserting portion 21 side of the die 20 after press-fitting the first punch 11. It may be configured to include a second punch 17 for moving the protrusion 40 to the outside.

Specifically, the first punch 11 is a hollow tube-shaped body 12, the press-fit end 15 that is press-inserted into the mold holes 32, 44 and the insertion portion 21 of the holder (31, 33) And, it may be configured to include a locking step 14 provided between the body 12 and the press-fit end 15. In addition, a plurality of protrusion mounting ends 16 are radially formed outside the indentation end 15. Each of the punch protrusions 40 is mounted to the protrusion mounting end 16.

In addition, the second punch 17 is mounted in the hollow hole 13 of the first punch 11 and the lower tapered surface 18 is formed outside the lower surface. Each of the punch protrusions 40 includes an outer inclined surface 41 and an inner upper inclined surface 42 which is in surface contact with the tapered surface 18 of the second punch 17. However, after press-fitting, the second punch 17 is slid to the lower side to move each of the punch protrusions 40 to the outside, so that a plurality of expansion parts 6 are formed at the outer periphery of the lower part of the press-fitting portion 5 of the dissimilar material sheet 4. It can be formed.

Hereinafter, a method for joining the dissimilar material thin plates 4 by using the clinching device 100 having the above-described two-stage indentation structure will be described. The lower holder 33 having the mold hole 34 is positioned on the die 20 having the insertion portion 21, and the dissimilar material thin plate 4 is positioned on the lower holder 33. Then, the upper holder 31 having the mold hole 32 is positioned above the heterogeneous material thin plate 4. Figure 5 shows a cross-sectional view of the pre-stage stage indentation state in the clinching device 100 in an embodiment of the present invention.

Then, the punch 10 is press-fitted into the dissimilar material sheet 4 by pressing the punch 10 into the mold holes 32 and 34 of the upper holder 31 and the lower holder 33 and the inserting portion 21 of the die 20. (5) is formed and joined. Specifically, the first punch 11 of the punch 10 is press-fitted such that the lower surface of the first punch 11 is positioned to the lower end of the insertion portion 21 of the die 20.

Figure 6 shows a cross-sectional view after the first stage indentation according to an embodiment of the present invention. As shown in FIG. 7, it can be seen that the punch 10 is moved to the lower surface of the insertion part 21 of the die 20 such that the indentation part 5 is formed on the dissimilar material thin plate 4.

In addition, the second punch 17 is moved to the lower side to move the punch protrusions 40 to the outside to form a plurality of extensions 6 on the outer circumferential surface of the bottom of the press-fit portion 5 of the heterogeneous material thin film 4. The press-in step is performed. Figure 7 shows a cross-sectional view after two-stage indentation according to an embodiment of the present invention.

As shown in FIG. 7, after the first stage indentation, the second punch 17 is moved to the lower side so that each punch protrusion 40 slides on the tapered surface 18 of the second punch 17, respectively. Will be moved. As the punch protrusion 40 moves to the outside, the expansion portion 6 is formed at the lower side of the press-fit portion 5 of the heterogeneous material thin plate 4 to improve the bonding strength.

In addition, the above-described apparatus and method may not be limitedly applied to the configuration and method of the above-described embodiments, but the embodiments may be selectively combined in whole or in part in each of the embodiments so that various modifications may be made. It may be configured.

1: Conventional clinching device
2: first material sheet
3: second material thin plate
4: heterogeneous material thin plate
5: press-fitting
6: Extension
10: Punch
11: first punch
12: body
13: hollow hole
14: Take chin
15: press-fit end
16: projection mounting stage
17: the second punch
It is a tapered side
20: Die
21: insertion part
31: upper holder
32: upper holder mold hole
33: lower holder
34: Lower holder mold hole
40: Punch protrusion
41: Outside slope
42: inner upper slope
Clinching device with 100: two-stage indentation structure

Claims (5)

In the clinching device for laminating a plurality of dissimilar material thin plate,
A die having an insertion portion formed at an upper center end thereof;
A lower holder positioned on the die and having a mold hole having a diameter smaller than the insertion portion at a central end thereof;
An upper holder positioned above the lower holder and having a mold hole formed at a central end thereof;
A plurality of dissimilar material thin plates to be joined between the upper holder and the lower holder; And
And a punch for displacing the dissimilar material sheet between the upper and lower holders, and then pressing the dissimilar material sheet to the insert part to join the dissimilar material sheet.
The punch is
The first punch in the form of a hollow tube pressed into the mold hole and the insertion portion, a plurality of punch protrusions mounted on the lower outer side of the first punch, the inside of the first punch and press-fit of the first punch And a second punch moved to the insertion part side to move the plurality of punch protrusions outward.
The method of claim 1,
The first punch is a body, a press-fit end that is press-fitted and inserted into the mold hole and the insertion portion side, a locking step provided between the body and the press-fit end, and a plurality of projection mounting ends formed radially outside the press-fit end And
And each of the punch protrusions is mounted to the protrusion mounting end.
The method of claim 2,
The second punch is mounted to the hollow hole of the first punch and provided with a tapered surface outside the lower surface, the punch projection is provided with an outer inclined surface and the inner upper inclined surface in surface contact with the tapered surface, After the first stage indentation by the punch, the second punch is moved to the lower side to move each of the punch projections to the outside to form a plurality of expansion parts on the outer peripheral surface of the lower indentation portion of the heterogeneous material thin plate Having a clinching device.
The method of claim 3, wherein
And a diameter of the insert portion of the die is larger than the diameter of the mold hole.
In the method for bonding the dissimilar material plate using a clinching device having a two-stage indentation structure according to any one of claims 1 to 4,
Positioning a lower holder having a mold hole on a die having an insertion portion, and placing a dissimilar material thin plate on the lower holder;
Positioning an upper holder having a mold hole on the dissimilar material thin plate; And
And pressing a punch into the mold hole of the upper holder and the lower holder and the insertion part of the die to form a press-fitting part in a heterogeneous material thin plate.
The bonding step,
A first step of indenting the first punch of the punch such that the lower surface of the first punch is positioned to the lower end of the insert of the die; And a two-stage indentation step of moving the second punch to the lower side to move each of the punch protrusions to the outside to form a plurality of expansion parts on the outer circumferential surface of the bottom of the indentation portion of the dissimilar material plate. Bonding method for dissimilar materials using clinching device.

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