KR101396144B1 - Device of vibro-spot welding - Google Patents

Abstract

Disclosed is a vibration spot welding device. The vibration spot welding device includes a pair of vibration welders facing each other around metal plates laid on top of the other to heat and vibrate the welding portions of the metal plates to generate plastic flow, wherein each vibration welder includes: an electrode having a through hole formed thereon to heat the metal plates laid on top of each other by the application of current thereto; a cylinder mounted on the rear end portion of the electrode to receive the pressure with which vibrations are applied to the welding portions; a vibration piston having front and rear end portions connected to each other, the rear end portion thereof being located within the cylinder to receive the pressure and the front end portion thereof being passed through the cylinder to linearly reciprocate in the through hole of the electrode by means of the pressure; a pressuring piston located in the cylinder to transmit the pressure formed in the cylinder to the vibration piston; a rotation inducing member fixed to the through hole of the electrode in such a manner as to surround the front end portion of the vibration piston and adapted to convert the linear movement of the vibration piston into the rotary movement; and an agitation screw located on the front end portion of the vibration piston and agitating the welding portions through the rotary movement of the vibration piston.

Description

[0001] DEVICE OF VIBRO-SPOT WELDING [0002]

An embodiment of the present invention relates to a vibration spot welding apparatus, and more particularly, to a vibration spot welding apparatus which applies heat to a welded portion of a superimposed metal plate and applies a continuous repetitive load to weld the overlapped metal plate.

Generally, there are fusion welding and solid phase welding methods for welding two sheets of relatively thin overlapping metal sheets in general. The spot welding method is a melting welding method. The spot welding method is a method of welding the metal plates by applying heat and pressure to the welded portions of the overlapped metal plates by electric resistance to melt the welded portions.

Friction Stir Welding (FSW) is an example of a solid-state welding method. In friction stir welding, when a probe of a rotating tool is inserted in a superimposed metal plate, friction heat between the rotating projection and the metal plate Means a method of welding the metal plates by forcibly mixing the welds of both metal plates by the plastic flow generated in the welds by the softening of the metal plate around the tool and stirring of the tool.

The spot welding and the friction stir welding have advantages and disadvantages. For example, spot welding is performed by melting the welded portion of the metal plates by heat generated by electrical resistance, Arcing is caused and the welding surface is defective.

Since the friction stir welding is a solid-state welding method, the welded metal plates have excellent mechanical strength, arc is not generated, and it is advantageous for welding of light metal, while welded surfaces or holes There are disadvantages.

In order to solve the problems of spot welding and friction stir welding, Extrusion Spot Welding (ESW) such as Korean Patent No. 743857 has been developed. Korean Patent No. 743857 discloses a technique of instantaneously heating two overlapping metal plates and a separate metal strip with electrodes, punching the material to be pressed from the metal strip, and extruding the punched material onto the overlapped metal plate to weld the metal plate . Such an extrusion point joining method is advantageous in that the joining force is strong and no arc is generated, but there is a disadvantage that a separate metal strip is used.

Meanwhile, in order to solve the problem of the point bonding method according to Korean Patent No. 743857, a vibration spot welding apparatus and method such as Korean Patent Publication No. 2012-0010570 has been developed.

Korean Laid-Open Patent Application No. 2012-0010570 discloses a technique of applying heat to a welded portion of a superimposed metal plate and welding a superimposed metal plate by applying a continuous linear repetitive load.

However, such a vibration spot welding apparatus is limited to bonding the metal plate with a cyclic load of simple straight-line reciprocating motion, so that energy consumption is large and a long time is required for welding.

Furthermore, in the prior art, since the metal plate is joined by the repetitive load of the simple straight-line reciprocating motion, the welded portions are not completely mixed, and only the surface portions are compressed and bonded, and as a result, the bonding strength of the welded portion may be deteriorated.

Embodiments of the present invention are intended to provide a vibration spot welding apparatus capable of applying heat to a welded portion of a superimposed metal plate and smoothly mixing a welded portion as a rotational vibration force.

A vibration spot welding apparatus according to an embodiment of the present invention includes a pair of vibration welders facing each other with the overlapped metal plate as a reference, heating the welded portion of the metal plate through the vibration welder, applying vibration to the welded portion, Wherein the vibrating welder includes a through hole and receives an electric current to heat the overlapped metal plate, and an electrode mounted on a rear end of the electrode and supplied with a pressure for applying vibration to the weld And a rear end portion which is located in the cylinder and is applied with the pressure, the front end portion of the vibration piston passing through the cylinder and linearly reciprocating by the pressure in the through-hole of the electrode includes a cylinder and a front end portion and a rear end portion connected to each other, And a pressure sensor disposed in the cylinder, A rotation inducing member which surrounds the front end portion of the vibration piston and is fixed to the through hole of the electrode and converts the linear motion of the vibration piston into rotational motion; And a stirring screw for mixing the welded portion as a rotational motion of the vibration piston.

Further, in the vibration spot welding apparatus according to the embodiment of the present invention, the front end portion of the vibration piston has a circular cross-sectional shape, and a locking protrusion may protrude from the outer circumferential surface of the front end portion.

Further, in the vibration spot welding apparatus according to the embodiment of the present invention, the rotation inducing member may be formed with a slot hole corresponding to the rotation locus of the vibration piston.

In the vibration spot welding apparatus according to the embodiment of the present invention, the latching protrusion may be fitted in the slot hole.

Further, in the vibration spot welding apparatus according to the embodiment of the present invention, the rotation inducing member is formed in a cylindrical shape whose rear end is opened and whose front end is closed, and on the closed surface of the front end, Holes may be formed.

Further, in the vibration spot welding apparatus according to the embodiment of the present invention, the through-hole may be formed at a position eccentric from the center of the closed surface.

In the vibration spot welding apparatus according to the embodiment of the present invention, a cover may be mounted at the rear end of the cylinder.

Further, in the vibration spot welding apparatus according to the embodiment of the present invention, a chamber for receiving the pressure may be formed between the pressure piston in the cylinder and the cover.

In the vibration spot welding apparatus according to the embodiment of the present invention, an elastic member may be provided between the rear end of the vibration piston and the front end of the cylinder.

In the vibration spot welding apparatus according to the embodiment of the present invention, a first stopper for supporting the rear end of the vibration piston may be mounted on the inner circumferential surface of the cylinder on the rear side of the vibration piston.

In the vibration spot welding apparatus according to the embodiment of the present invention, a second stopper for supporting the rear end of the pressure piston may be mounted on the inner circumferential surface of the cylinder on the rear side of the pressure piston.

Embodiments of the present invention can provide a vibrating piston rotating and reciprocatingly moving with an agitating screw to smoothly mix the welded portion as the rotational vibration force of the agitating screw.

Therefore, in the embodiment of the present invention, it is possible to induce interfacial bonding of the material of the welded portion, so that the bonding force of the welded portion can be improved, energy consumption is reduced, and the welding required time can be shortened.

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 sectional view showing a vibration spot welding apparatus according to an embodiment of the present invention.
2 is a perspective view showing a vibration welding machine applied to a vibration spot welding apparatus according to an embodiment of the present invention.
3 is a perspective view showing a vibration piston region applied to a vibration spot welding apparatus according to an embodiment of the present invention.
4 is a cross-sectional view illustrating a process of welding two sheets of metal plates using a vibration spot welding apparatus according to an embodiment of the present invention.

Hereinafter, 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.

It should be noted that terms such as " ... unit ", "unit of means "," part of item ", "absence of member ", and the like denote a unit of a comprehensive constitution having at least one function or operation it means.

1 is a sectional view showing a vibration spot welding apparatus according to an embodiment of the present invention.

Referring to FIG. 1, a vibration spot welding apparatus 100 according to an embodiment of the present invention includes a pair of vibration welders 10 facing each other with reference to first and second metal plates 60 and 62 .

The pair of vibration welders 10 may have the same structure or different structures. For convenience of explanation, the pair of vibration welders 10 are assumed to have the same structure, but the present invention is not limited thereto.

FIG. 2 is a perspective view showing a vibration welding apparatus applied to a vibration spot welding apparatus according to an embodiment of the present invention, and FIG. 3 is a perspective view showing a vibration piston region applied to a vibration spot welding apparatus according to an embodiment of the present invention .

1 to 3, the vibration welding machine 10 according to the embodiment of the present invention heats the first and second welds 64 and 66 of the first and second metal plates 60 and 62, So that a plastic flow is generated in the first and second welds 64 and 66 by power and the first and second welds 64 and 66 are smoothly mixed.

To this end, the vibration welder 10 according to the embodiment of the present invention basically includes an electrode 12, a cylinder 16, a vibration piston 20, and a pressure piston 30.

The front side and the front end portions refer to the side near the first and second metal plates 60 and 62 and the like and the rear and rear end portions indicate the side and the end far from the first and second metal plates 60 and 62 .

The electrode 12 has through holes 14 and heats the overlapped first and second metal plates 60 and 62 under a current.

The cylinder 16 is mounted at the rear end of the electrode and is supplied with a pressure for applying vibration to the welded portion. The front end of the cylinder 16 is coupled to the electrode 12 so as to be connected to the through hole 14 of the electrode 12. A cover 18 is attached to the rear end of the cylinder 16.

The vibrating piston (20) includes a front end (21) and a rear end (26) connected to each other. The rear end 26 has a circular cross-sectional shape, and is positioned in the cylinder 16 to receive pressure. The front end portion 21 is integrally connected to the rear end portion 26 and passes through the front end of the cylinder 16 and performs a linear reciprocating motion in the through hole 14 of the electrode 12 by the above-

1, the vibration piston 20 may have a front end portion 21 and a rear end portion 26 separated from each other, and the front end portion 21 and the rear end portion 26 may be separated from each other, May be integrally connected.

The pressure piston (30) is located in the cylinder (16) and transfers the pressure formed in the cylinder (16) to the vibrating piston (20).

The pressure piston 30 has a rear end 32 on which pressure acts substantially and a front end 34 which transmits pressure acting on the rear end 32 to the rear end 26 of the vibration piston 20. [ .

A chamber 36 is formed between the pressure piston 30 and the cover 18 in the cylinder 16 to receive a pressure. That is, the chamber 36 is formed between the rear end 32 of the pressure piston 30 and the cover 18.

The chamber 36 is connected to the pressure supply unit 70 through the pressure supply line 40 and is supplied with pressure. The pressure may be hydraulic or pneumatic.

A resilient member 29 such as a spring is provided between the rear end 26 of the vibration piston 20 and the front end of the cylinder 16. A first stopper 28 for supporting the rear end portion 26 of the vibration piston 20 is mounted on the inner circumferential surface of the cylinder 16 on the rear side of the vibration piston 20, 16 has a second stopper 38 for supporting the rear end 32 of the pressure piston 30.

On the other hand, a through hole 14 of the electrode 12 is provided with a rotation inducing member (not shown) that rotatably surrounds the front end 21 of the vibration piston 20 and converts the linear motion of the vibration piston 20 into rotational motion 81 are installed. The rotation inducing member 81 penetrates through the through hole 14 and can be securely fixed to the inner circumferential surface of the through hole 14.

In order to convert the linear motion of the vibration piston 20 into the rotational motion through the rotation inducing member 81 as described above, the locking protrusion 83 is formed on the outer peripheral surface of the front end of the vibration piston 20 so as to protrude.

A slot hole 85 corresponding to the rotation locus of the vibration piston 20 is formed in the rotation inducing member 81 and a locking protrusion 83 of the vibration piston 20 is fitted in the slot hole 85. Here, the rotation inducing member 81 may have a cylindrical shape with a rear end opened and a front end closed.

On the other hand, the front end portion 21 of the vibration piston 20 as described above is provided with the first and second welding portions 64 and 66 for mixing the first and second welding portions 64 and 66 by the rotational motion of the vibration piston 20 The stirring screw 91 is formed.

The stirring screw 91 passes through the through hole 87 formed in the front end side closing surface of the rotation inducing member 81 as the vibration piston 20 reciprocates by the pressure piston 30, (64, 66) can be smoothly mixed.

In this case, the stirring screw 91 is installed at the center front end face of the vibrating piston front end portion 21, and the through hole 87 of the rotation inducing member 81 is formed at a position eccentric from the center of the front end- .

The passage hole 87 in the one-side vibration welder 10 can be formed eccentrically to one side from the center of the front surface-side closing surface of the rotation inducing member 81, on the basis of the pair of vibration welding machines 10.

The through hole 87 in the other one side vibration welder 10 may be eccentrically formed to the other side from the center of the front end side closing surface of the rotation inducing member 81.

The operation of the vibration spot welding apparatus 100 according to an embodiment of the present invention will now be described with reference to the previously disclosed figures and FIG. 4. In the embodiment of the present invention, (60, 62).

When the first and second metal plates 60 and 62 are overlapped, the first and second metal plates 60 and 62 are positioned between the pair of vibration welders 10. Thereafter, pressure is applied to the pair of electrodes 12, and the first and second metal plates 60 and 62 are brought into close contact with each other.

When the first and second metal plates 60 and 62 overlap each other, power is supplied to the pair of electrodes 12 to rapidly heat the first and second welds 64 and 66. Then, the first and second welding portions 64 and 66 are heated by the electrode 12 to be softened.

Thereafter, when the pressure is supplied to and blocked from the chamber 36 through the pressure supply unit 70, the pressure acting on the pressure piston 30 and the elastic restoring force of the elastic member 29 acting on the vibration piston 20 The pair of vibrating pistons 20 make a reciprocating motion, and are reciprocated while rotating by the rotation guiding member 81.

The stirring screw 91 passes through the through hole 87 of the rotation inducing member 81 and passes through the first and second welds 64 and 66. As the vibration piston 20 rotates, .

Accordingly, in the embodiment of the present invention, plastic flow is generated in the first and second welds 64 and 66 and mixed with each other by the stirring screw 91 when the above process is repeated.

According to the vibration spot welding apparatus 100 according to the embodiment of the present invention as described so far, the first and second welds 64 and 66 of the first and second metal plates 60 and 62 are connected to each other through the electrode 12, So that plastic flow is generated in the first and second welds 64 and 66 as rotational vibration force by the stirring screw 91 of the vibration piston 20 and the first and second welds 64 and 66 are smoothly .

As a result, in the embodiment of the present invention, the interface bonding of the first and second welds 64 and 66 can be induced, so that the bonding strength of the first and second welds 64 and 66 can be improved, And the welding time can be shortened.

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, Other embodiments may easily be suggested by adding, changing, deleting, adding, or the like of elements, but this also falls within the scope of the present invention.

10 ... Vibration welder 12 ... Electrode
14 ... through hole 16 ... cylinder
18 ... cover 20 ... vibration piston
28 ... first stopper 29 ... elastic member
30 ... pressure piston 36 ... chamber
38 ... second stopper 40 ... pressure supply line
60, 62 ... metal plate 64, 66 ... welded portion
70 ... pressure supply part 81 ... rotation guide member
83 ... Engagement projection 85 ... Slot hole
87 ... through hole 91 ... stirring screw

Claims (8)

A vibration spot welding apparatus comprising a pair of vibration welders facing each other with a superimposed metal plate as a reference, heating a welded portion of the metal plate through the vibration welder, applying vibration to the welded portion to generate plastic flow,
The vibration welder includes:
An electrode which has a through hole and receives an electric current to heat the overlapped metal plate;
A cylinder mounted on a rear end of the electrode and supplied with a pressure for applying vibration to the welded portion;
A vibration piston having a front end portion and a rear end portion connected to each other, the rear end portion being positioned in the cylinder and being applied with the pressure, the front end portion being passed through the cylinder and reciprocating linearly by the pressure in the through hole of the electrode;
A pressure piston located in the cylinder and transmitting the pressure formed in the cylinder to the vibration piston;
A rotation inducing member that surrounds the front end of the vibration piston and is fixed to the through hole of the electrode to convert a linear motion of the vibration piston into a rotational motion; And
And a stirring screw installed at a front end portion of the vibration piston and mixing the welding portion as a rotational motion of the vibration piston. The method according to claim 1,
Wherein a front end portion of the vibration piston has a circular cross-sectional shape, a locking protrusion is protruded from an outer circumferential surface of the front end portion,
Wherein the rotation inducing member is provided with a slot hole corresponding to a rotation locus of the vibration piston, and the engagement protrusion is fitted in the slot hole. 3. The method of claim 2,
Wherein the rotation inducing member has a cylindrical shape in which a rear end is opened and a front end is closed,
Wherein a passage hole through which the stirring screw passes is formed on a closed surface of the front end. The method of claim 3,
And the through-hole is formed at a position eccentric from the center of the closed surface. The method according to claim 1,
A cover is mounted on the rear end of the cylinder,
Wherein a chamber for receiving the pressure is formed between the pressure piston and the cover in the cylinder. 6. The method of claim 5,
Wherein an elastic member is provided between the rear end of the vibration piston and the front end of the cylinder. The method according to claim 6,
Wherein a first stopper for supporting a rear end portion of the vibration piston is mounted on an inner circumferential surface of the cylinder on the rear side of the vibration piston. 8. The method of claim 7,
And a second stopper for supporting a rear end portion of the pressure piston is mounted on the inner circumferential surface of the cylinder on the rear side of the pressure piston.

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