KR20190072711A - Clincging device using two step press type - Google Patents

Abstract

The present invention relates to a clinching apparatus having a two-stage press-fit structure and a joining method using a clinching apparatus thereof, and more specifically, to a clinching apparatus which is provided to accumulate a plurality of different material thin plates before joining the same, comprising: a die having an insertion unit at a central end of an upper portion; a lower holder located at the upper portion of the die, and having a mold hole with a diameter smaller than that of the insertion unit at a central end; an upper holder located at an upper portion of the lower holder, and having a mold hole at a central end; a plurality of different material thin plates which are to be joined after being located between the upper holder and the lower holder; and a punch joining the different material thin plates after being press-fit into the mold hole and the insertion unit when the different material thin plates are located between the upper holder and the lower holder. Here, in the clinching apparatus having a two-stage press-fit structure, the punch is characterized by comprising: a first punch in a hollow pipe shape which is press-fit into the mold hole and the insertion unit; a plurality of punch protrusions mounted on the outside of a lower portion of the first punch; and a second punch mounted on the inside of the first punch, and, after the first punch is press-fit, moved towards the insertion unit so as to move the plurality of punch protrusions to the outside.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a clinching apparatus having a two-step indentation structure and a bonding method using the clinching apparatus.

The present invention relates to a clinching apparatus having a two-step press-in structure and a bonding method using the clinching apparatus.

2. Description of the Related Art Generally, laser welding using a laser beam output from a laser oscillator or electric resistance welding using a spot welding machine is mainly applied to overlap two metal plates in an industrial field.

In a typical laser welding system for welding a steel sheet material using a laser beam, a laser head is installed at the tip of the arm of the robot, and the laser head is connected to a laser oscillator. The robot is controlled by the robot controller so that the laser beam is irradiated while moving the laser head along the welding pattern of the workpiece, thereby performing the welding work.

Meanwhile, in recent years, there has been a tendency that a metal plate material or a non-ferrous metal plate material as well as a composite plate material is applied to a vehicle body in accordance with the trend of high strength and light weight of a vehicle body.

However, these materials are expensive due to the high cost of the raw material itself, and are limited to bonding or mechanical bonding. Particularly, welding between two kinds of materials can not be performed by laser welding or spot welding due to the physical properties of the two materials. Is more impossible.

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

In addition, the clinching technique can be applied as a mechanical bonding method for dissimilar materials. 1 shows a cross-sectional view of a cleansing device 1 without a consumable material using a conventional punch, die, upper holder, and lower holder. FIG. 2 is a cross-sectional view of a clinching apparatus in which a press-in portion is formed in a thin plate of a dissimilar material by press-fitting a punch in FIG.

1 and 2, it can be seen that the clinching apparatus 1 comprises a die 20, an upper holder 31, a lower holder 33, and a punch 10. 1 and 2, a lower holder 33 having a mold hole 34 formed therein is placed on a die 20 on which an insert 21 is formed, and on the lower holder 33, (4). After the upper holder 31 having the mold hole 32 formed thereon is positioned, the punch is inserted into the insertion portion 21 of the die 2 and press-fitted to form a press-fit portion on the different-material thin plate.

In other words, such a cleansing method corresponds to a method of sticking two materials together so that they do not fall out when they are joined to each other. Since it does not pierce holes, it has the advantage of fewer steps and faster processing speed compared with fastening using bolts and has the advantage of being applicable to any material.

That is, in the case of the conventional cleaning method, additional joint elements are unnecessary and lightweight, eco-friendly machining is possible, processing time is short, and dynamic strength is improved as compared with spot welding. However, There is a drawback that it is inevitably reduced.

The diameter of the insertion portion 21 of the die 20 is made larger than the diameter of the mold holes 32 and 34 of the holders 31 and 33 as shown in Figures 1 and 2, It can be seen that the expanding portion 36 is formed in the outer peripheral portion of the lower end of the lower portion 5 to improve the bonding force.

However, in the conventional cleansing method, the bonding strength is still only 50 to 70% of the spot welding, there is a fear that the concentrated stress will form, and it is difficult to apply to the high strength material. There is a possibility that there is a possibility of separation between the plates.

Therefore, it has been required to develop an improved clinching technique capable of increasing the bonding strength of clinching and eliminating the concentrated stress.

Korean Registered Patent No. 1304897 Korea Patent Publication No. 2009-0108693 Korea Patent No. 0626106

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is therefore an object of the present invention to provide a punch which is formed by a double punch, A clamping device having a two-stage press-fitting structure for joining thin plates of different materials capable of expanding the application fields of automobile parts and home appliance assemblies by improving the bonding strength of the quasi- And a bonding method using the clinching apparatus.

In addition, according to the embodiment of the present invention, the cost efficiency is higher than that of spot welding, and the bonding strength can be increased by about 20% as compared with the conventional clinching method, and the processing time is quick, , It is possible to realize environment-friendly, it is useful for various materials combination without additional joining elements, and it is possible to confirm the quality of joining with naked eye without generating noise during process while saving energy. And to provide a bonding method using the device and the clinching apparatus.

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 not intended to limit the invention to the precise form disclosed. It can be understood.

A first object of the present invention is to provide a clinching apparatus for laminating and joining a plurality of thin plates of different kinds of materials, comprising: a die having an insert portion formed at an upper middle end; A lower holder positioned above the die and having a mold hole having a diameter smaller than that of the insert at the center end; An upper holder positioned above the lower holder and having a mold hole at a middle end thereof; A plurality of different-material thin plates to be bonded between the upper holder and the lower holder; And a punch which is inserted between the upper holder and the lower holder and then press-fitted into the mold hole and the insertion portion to join the different thin plate to each other, A first punch in the form of a hollow tube to be press-fitted into the insertion portion side; a plurality of punch projections mounted on the lower outer side of the first punch; a plurality of punch projections mounted in the first punch, And a second punch which is moved to the outside and moves the plurality of punch projections outward. The present invention can be achieved by a clinching apparatus having a two-step press-in structure.

The first punch includes a body, a press-in end to be inserted and inserted into the mold hole and the insertion portion, a locking protrusion provided between the body and the press-in end, And each of the punch projections is mounted on the projection mounting end.

The second punch is mounted on the hollow hole of the first punch and has a lower paper surface on the outer side of the lower surface. The punch projection has an outer inclined surface and an inner upper inclined surface in surface contact with the tapered surface, The second punch is moved to the lower side after the first punch presses the first punch, and each of the punch projections is moved outward to form a plurality of extension portions on the outer peripheral surface of the lower end of the press-in portion of the dissimilar material thin plate.

And the diameter of the insert portion of the die is larger than the diameter of the mold hole.

A second object of the present invention is to provide a method for joining a thin plate made of different materials using a clinching apparatus having a two-stage press-in structure according to the first object, comprising the steps of: Positioning a disparate thin foil on the lower holder; Positioning an upper holder having a mold hole above the dispenser thin plate; And a step of press-fitting the punch into the mold hole of the upper holder and the lower holder and the insertion portion of the die to form a press-fit portion in the thin plate of dissimilar material to join the first punch and the punch, A step of press-fitting the lower surface of the first punch so that the lower surface of the first punch is positioned to the lower end of the insertion portion of the die; And a two-step press-in step of moving the second punch to the lower side to move each of the punch projections outward to form a plurality of expanding parts on the outer peripheral surface of the lower end of the press-in part of the dissimilar material thin plate Can be achieved as a method of joining a thin plate of different materials using a clinching apparatus.

According to the clinching apparatus having a two-stage press-in structure and the joining method using the clinching apparatus according to an embodiment of the present invention, a protruding punch is once again pulled out with a second punch through a two-step press- Thereby enhancing the bonding strength of the clinching and eliminating the concentrated stress, thereby making it possible to expand the application fields of automobile parts and home appliance assembly by supplementing the disadvantages of the conventional clinching method.

Further, according to the clinching apparatus having a two-stage press-in structure and the bonding method using the clinching apparatus according to an embodiment of the present invention, the cost efficiency is higher than that of spot welding, and the bonding strength is about 20 %, And the process time is fast and the dynamic strength is compared with that of spot welding. Light weight, environment friendliness can be realized, additional joining elements are not needed and it is useful for various material combinations, And the quality of the bonding can be confirmed with naked eyes without damaging the product.

It should be understood, however, that the effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those skilled in the art to which the present invention belongs It will be possible.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description, serve to further the understanding of the technical idea of the invention, It should not be construed as limited.
1 is a cross-sectional view of a cleansing device without a consumable material using a conventional punch, die, upper holder,
Fig. 2 is a cross-sectional view of a clinching apparatus in which a press-in portion is formed in a thin plate of a dissimilar material by press-
3 is a perspective view of a punch according to an embodiment of the present invention,
FIG. 4 is a perspective oblique view of the state in which the second punch is moved to the lower side in FIG. 3,
5 is a cross-sectional view of a clinching apparatus according to an embodiment of the present invention,
6 is a cross-sectional view after the first stage of press-fitting according to the embodiment of the present invention,
7 shows a cross-sectional view after a two-step indentation according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, and advantages of the present invention will become more readily apparent from the following description of preferred embodiments with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art.

In this specification, when an element is referred to as being on another element, it may be directly formed on another element, or a third element may be interposed therebetween. Also in the figures, the thickness of the components is exaggerated for an effective description of the technical content.

Embodiments described herein will be described with reference to cross-sectional views and / or plan views that are ideal illustrations of the present invention. In the drawings, the thicknesses of the films and regions are exaggerated for an effective description of the technical content. Thus, the shape of the illustrations 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 the shapes that are produced according to the manufacturing process. For example, the area shown at right angles may be rounded or may have a shape with a certain curvature. Thus, the regions illustrated in the figures have attributes, and the shapes of the regions illustrated in the figures are intended to illustrate specific forms of regions of the elements and are not intended to limit the scope of the invention. Although the terms first, second, etc. have been used in various embodiments of the present disclosure to describe various components, these components should not be limited by these terms. These terms have only been used to distinguish one component from another. The embodiments described and exemplified herein also include their complementary embodiments.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. The terms "comprises" and / or "comprising" used in the specification do not exclude the presence or addition of one or more other elements.

In describing the specific embodiments below, various specific details have been set forth in order to explain the invention in greater detail and to assist in understanding it. However, it will be appreciated by those skilled in the art that the present invention may be understood by those skilled in the art without departing from such specific details. In some instances, it should be noted that portions of the invention that are not commonly known in the description of the invention and are not significantly related to the invention do not describe confusing reasons to explain the present invention.

Hereinafter, the structure and function of a clinching apparatus 100 having a two-stage press-in structure according to an embodiment of the present invention, and a joining method using the clinching apparatus 100 will be described.

A clinching apparatus 100 according to an embodiment of the present invention includes a die 20, a holder, and a punch 10, like a conventional clinching apparatus 1. The die 20 is formed with an insert 21 at the upper middle end and a lower holder 33 is positioned on the die 20 and a lower end A mold hole 34 is formed.

The upper holder 31 is positioned on the upper side of the lower holder 31 and the mold hole 32 is formed on the middle end of the upper holder 31. And the thin plate 4 of different materials to be bonded is located between the upper holder 31 and the lower holder 33. [ The heterogeneous thin plate 4 has an upper holder 31 and a lower holder 33 in the form of a laminate of a first thin plate 2 (for example, steel) and a second thin plate 3 (for example, aluminum) Respectively.

The punch 10 is pressed into the side of the insertion part 21 after the heterogeneous material thin plate 4 is positioned between the upper holder 31 and the lower holder so that the dissimilar material thin plate 4 is press- .

3 is a perspective view of a punch 10 according to an embodiment of the present invention. 4 shows a perspective view in a state in which the second punch 17 is moved downward in Fig. 3 and 4, the punch 10 according to the embodiment of the present invention includes a first punch 11, a second punch 17, and a punch projection 40, Structure can be realized.

The punch 10 according to the embodiment of the present invention includes a first punch 11 in the form of a hollow tube to be pressed into the mold holes 32 and 34 and the insertion portion 21 side, A plurality of punch projections 40 mounted on the outside of the first punch 11 and a plurality of punches 40 mounted on the inside of the first punch 11 and moved toward the insertion portion 21 of the die 20 after the first punch 11 is press- And a second punch 17 for moving the protrusion 40 outward.

Specifically, the first punch 11 includes a body 12 in the form of a hollow tube, a press-in end 15 into which the mold holes 32 and 44 of the holders 31 and 33 and the insert 21 are press- And a locking protrusion (14) provided between the body (12) and the press-in end (15). In addition, a plurality of protrusion mounting ends 16 are radially formed outside the press-in end 15. Each of the punch projections 40 is mounted on the projection mounting end 16.

The second punch 17 is mounted on the hollow hole 13 of the first punch 11 and the lower paper surface is formed on the outer side of the lower surface. Each of the punch projections 40 is provided with an outer inclined surface 41 and an inner upper inclined surface 42 in surface contact with the tapered surface 18 of the second punch 17, The second punch 17 is slid downward to move each of the punch projections 40 outward so that a plurality of enlarged portions 6 are formed on the outer peripheral portion of the lower end of the press-fitting portion 5 of the different- .

Hereinafter, a method for joining the different-material thin plate 4 using the clinching apparatus 100 having the above-described two-stage press-in structure will be described. The lower holder 33 having the mold hole 34 is placed on the die 20 having the insertion portion 21 and the thin plate 4 of the different material is placed on the lower holder 33. Then, the upper holder 31 having the mold hole 32 is positioned on the upper portion of the thin material plate 4. 5 is a cross-sectional view of a clinching apparatus 100 according to an embodiment of the present invention in a state before a first-stage press-fitting.

The punch 10 is pressed into the upper holder 31 and the mold holes 32 and 34 of the lower holder 33 and the insertion portion 21 of the die 20 to press the different- (5) are formed and joined together. Specifically, the first punch 11 of the punch 10 is subjected to a one-step pressing-in step in which the lower surface of the first punch 11 is press-fitted into the lower end of the insertion portion 21 of the die 20.

6 shows a cross-sectional view after the first stage of press-fitting according to the embodiment of the present invention. 7, the punch 10 is moved to the lower surface of the insertion portion 21 of the die 20, so that the press-fitting portion 5 is formed in the thin plate 4 of different kinds of materials.

And the second punch 17 is moved to the lower side to move each of the punch projections 40 to the outside to form a plurality of expanding portions 6 on the outer peripheral surface of the lower end of the press- The pressing-in step is carried out. 7 shows a cross-sectional view after a two-step indentation according to an embodiment of the present invention.

7, the second punch 17 is moved to the lower side after the first-step press-fitting so that the respective punch projections 40 are slid on the tapered surface 18 of the second punch 17, . The punch projections 40 are moved outwardly so that the extension portions 6 are formed on the lower side of the press-in portions 5 of the different-material thin plate 4 to improve the joint strength.

It should be noted that the above-described apparatus and method are not limited to the configurations and methods of the embodiments described above, but the embodiments may be modified so that all or some of the embodiments are selectively combined .

1: Conventional clinching device
2: first material thin plate
3: second material thin plate
4: Sheets of heterogeneous material
5:
6: Extension part
10: punch
11: 1st punch
12: Body
13: hollow hole
14:
15:
16:
17: second punch
18: Taper face
20: die
21:
31: Upper holder
32: upper holder mold hole
33: Lower holder
34: Lower holder mold hole
40: punch projection
41: outer inclined surface
42: inner upper inclined surface
100: Cloning device with double indentation structure

Claims (5)

CLAIMS 1. A clinching apparatus for laminating a plurality of thin plates of different kinds and then joining,
A die having an insertion portion formed at an upper middle end thereof;
A lower holder positioned above the die and having a mold hole having a diameter smaller than that of the insert at the center end;
An upper holder positioned above the lower holder and having a mold hole at a middle end thereof;
A plurality of different-material thin plates to be bonded between the upper holder and the lower holder; And
And a punch which is inserted between the upper holder and the lower holder and then press-fitted into the mold hole and the insertion portion to join the thin plate of different material,
The punch includes:
A first punch in the form of a hollow tube to be press-fitted into the mold hole and the insertion portion side; a plurality of punch projections mounted on a lower outer side of the first punch; And a second punch which is moved toward the insertion portion to move the plurality of punch projections outward.
The method according to claim 1,
The first punch includes a body, a press-in end to be inserted and inserted into the mold hole and the insertion portion, a stop protrusion provided between the body and the press-in end, and a plurality of protruding attachment portions formed radially outwardly of the press- And,
And each of the punch projections is mounted on the projection mounting end.
3. The method of claim 2,
Wherein the second punch is mounted on the hollow hole of the first punch and has a lower paper surface on the outer side of the lower surface, the punch projection has an outer inclined surface and an inner upper inclined surface in surface contact with the tapered surface, Wherein the second punch is moved to the lower side after the first punching by one punch to move each of the punch projections outward to form a plurality of extension portions on the outer peripheral surface of the lower end of the press- Lt; / RTI >
The method of claim 3,
Wherein the diameter of the insert portion of the die is larger than the diameter of the mold hole.
A method for joining a thin sheet of dissimilar materials using a clinching apparatus having a two-stage press-fit structure according to any one of claims 1 to 4,
Placing a lower holder having a mold hole on a die having an insert, and positioning a dispenser thin plate on the lower holder;
Positioning an upper holder having a mold hole above the dispenser thin plate; And
And punching the punch into a mold hole of the upper holder and the lower holder and an insertion portion side of the die to form a press-fit portion in the different-material thin plate,
The bonding step may include:
The first punch of the punch is press-fitted so that the lower surface of the first punch is positioned to the lower end of the insertion portion of the die; And a two-step press-in step of moving the second punch to the lower side to move each of the punch projections outward to form a plurality of expanding parts on the outer peripheral surface of the lower end of the press-in part of the dissimilar material thin plate A method of joining thin plates of heterogeneous materials using a clinching device.

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