KR101536913B1

KR101536913B1 - Clamp and laser welding apparatus having the same

Info

Publication number: KR101536913B1
Application number: KR1020140036773A
Authority: KR
Inventors: 장순근; 육완
Original assignee: 현대제철 주식회사
Priority date: 2014-03-28
Filing date: 2014-03-28
Publication date: 2015-07-15

Abstract

The present invention relates to a clamping body for supporting a welding object; And a protective gas injection unit installed inside the clamp body and injecting a protective gas supplied from the outside to the outside of the clamp body and receiving a signal from the outside to adjust an injection direction of the protective gas, Provide a clamp.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding object clamp,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser welding apparatus, and more particularly, to a laser welding apparatus for welding a workpiece clamp and a laser welding apparatus having the same, To a laser welding apparatus.

Generally, laser welding is a technique of welding a material by irradiating a high energy laser beam to a region to be welded, instantly melting the weld portion, and heat the region around the weld portion when the laser beam is moved to solidify the material.

Surface treated steel plate (zinc-plated steel plate) When a material such as steel plate is welded, a plasma is formed around the laser beam irradiation hole of the steel plate and the welded part due to the laser beam irradiated and the vaporized zinc vapor, Causing it to deteriorate.

Prior art related to the present invention is Korean Patent Laid-Open Publication No. 10-2003-0043425 (2003.06.02), and the above-mentioned prior art documents the technique of monitoring the welding pool size and controlling the focus in laser welding.

An object of the present invention is to provide a reclamp and a laser welding apparatus having the same. More particularly, the present invention relates to a clamp for a welding object capable of supporting a welding object and removing plasma generated during laser welding, .

In one aspect, the present invention provides a welding tool comprising: a clamp body for supporting a welding object; And a protective gas injection unit installed inside the clamp body and injecting a protective gas supplied from the outside to the outside of the clamp body and receiving a signal from the outside to adjust an injection direction of the protective gas, Provide a clamp.

It is preferable that a gas storage space for temporarily storing the protection gas supplied from the outside is formed inside the clamp body.

The clamp body may be formed at one side thereof with a spray hole having a predetermined length for exposing the gas storage space to the outside and spraying the protective gas.

The protective gas injection unit may include a plurality of vane plates provided at equal intervals in the injection holes and rotatable along a horizontal direction, a rotation motor for rotating the vane plates, And a controller for rotationally driving the motor.

Preferably, the signal is a signal for a movement path of a laser beam generated when laser welding is performed in a welding object region set in the welding object.

Preferably, the controller gradually rotates the plurality of blade plates using the rotation motor so as to sequentially direct one end and the other end of the movement path.

The signal may include information on the moving speed of the laser beam.

Preferably, the controller controls the rotation speed of the plurality of blade plates using the rotation motor so as to be proportional to the moving speed of the laser beam.

In another aspect, the present invention relates to a welding object clamp according to any one of claims 1 to 5; A beam emitting part for emitting a laser beam to the welding object to form a welding bead; And a moving unit that moves the beam emerging unit along the movement path and generates the signal.

INDUSTRIAL APPLICABILITY The present invention has an effect of effectively controlling plasma generated during laser welding of a surface-treated steel sheet (galvanized steel sheet).

That is, by injecting a uniform protective gas along the movement path of the laser beam in the section where the weld bead is formed, the laser penetration characteristic can be improved.

1 is a view showing a laser welding apparatus of the present invention.
2 is a view showing a welding object clamp of the present invention.
Fig. 3 is a view showing an operation state of a welding object clamp according to the present invention. Fig.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

FIG. 1 is a view showing a laser welding apparatus according to the present invention, and FIG. 2 is a view showing a welding object clamp according to the present invention.

1, a laser welding apparatus according to the present invention comprises a beam output unit 100, a moving unit 200, and a welding object clamp 300 (hereinafter, referred to as a clamp).

The beam output unit 100 outputs a laser beam having a predetermined output to an area to be welded of the object 10 to be welded.

The moving unit 200 is a device that moves the beam emitting unit 100 along the set moving path a.

For example, although not shown in the drawing, the moving unit 200 is constituted by a linear motor that moves the beam emitting unit 100 along a predetermined path (a) using an XY gantry and an XY gantry. The beam emitting portion 100 is connected to the XY gantry.

The linear motor is driven by a control signal of a controller 323 to be described later.

The moving unit 200 moves the beam output unit 100 along the set path a and transmits information about the moving speed v of the beam output unit 100 to the controller 323.

The clamp 300 is seated on the upper end of the welding object 10 applied by lap welding to support the welding object 10.

2, a clamp according to the present invention will be described.

The clamp 300 includes a clamp body 310 having a rectangular shape and a protective gas spraying unit 320.

The clamp body 310 supports the object 10 to be welded.

The protective gas spraying unit 320 is installed inside the clamp body 310. The protective gas spraying unit 320 injects the protective gas supplied from the outside into the outside of the clamp body 310 and receives a signal from the outside, The direction of injection of the fuel is controlled.

Inside the clamp body 310, a gas storage space 310a is formed in which the protective gas supplied from outside is temporarily stored.

At one side of the clamp body 310, an injection hole 311 having a predetermined length for exposing the gas storage space 310a to the outside and injecting the protective gas is formed.

Fig. 3 is a view showing an operation state of a welding object clamp according to the present invention. Fig.

3, the configuration of the protective gas spraying unit 320 will be described.

The protective gas spraying unit 320 includes a plurality of blade plates 321, a rotation motor 322, and a controller 323.

The plurality of vane plates 321 are installed upright on the injection holes 311 formed in the clamp body 310 and equally spaced from each other.

Here, the plurality of vane plates 321 are installed to rotate along the horizontal direction.

For example, a rotating shaft 321a is formed at the upper and lower ends of each of the plurality of blade plates 321, and the rotating shaft 321a is rotatably supported at the upper and lower ends of the inner side of the jet hole 311. [

The rotation motor 322 serves to horizontally rotate each of the plurality of blade plates 321.

The controller 323 receives the signal from the moving unit 200 and drives the rotation motor 322 to rotate.

Here, the above-mentioned signal is a signal for the movement path (a) of the laser beam generated when the laser welding is performed in the welding object region set in the welding object 10.

In addition, the signal includes information on the moving speed v of the beam output unit 100.

Accordingly, the controller 323 gradually rotates the plurality of blade plates 321 using the rotation motor 323 so as to sequentially direct one end and the other end of the movement path (a).

In addition, the controller 323 can control the rotation speed of the plurality of blade plates 321 using the rotation motor 322 so as to be proportional to the moving speed v of the beam output unit 100.

Next, the operation of the laser welding apparatus of the present invention will be described with reference to the above configuration.

Referring to Fig. 3, the clamp 300 is positioned at the upper end of the object 10 to support the object 10 to be welded.

The support position is arranged so as to be located near the side of the movement path (a) where welding is performed. Preferably, the movement path (a) and one side of the clamp 300 are arranged side by side.

Next, the controller 323 controls the beam output unit 100 to output the laser beam to the welding target area of the object 10 to be welded.

Also, the controller 323 moves the beam output unit 100 using the moving unit 200 so as to form the moving path a and the moving speed v.

Accordingly, a welding bead can be formed in the welding target region of the object 10 to be welded.

At the same time, the controller 323 uses the rotating motor 322 to rotate the wing plates 321 to follow the moving path a and to rotate at a rotational speed proportional to the moving speed v.

Accordingly, the protective gas supplied to the inner gas storage space 310a of the clamp body 310 is guided through the vanes 321 and the laser beam is emitted to form a weld bead Can be sprayed.

As a result, the plasma generated during the laser welding of the surface-treated steel sheet (galvanized steel sheet) to be welded can be effectively controlled.

That is, by injecting a uniform protective gas along the movement path of the laser beam in the section where the weld bead is formed, the characteristics of laser penetration can be improved.

Although specific embodiments of the welding object clamp and laser welding apparatus of the present invention have been described above, it is apparent that various modifications can be made without departing from the scope of the present invention.

Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

It is to be understood that the foregoing embodiments are illustrative and not restrictive in all respects and that the scope of the present invention is indicated by the appended claims rather than the foregoing description, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

10: object to be welded
100: beam emerging part
200:
300: Clamp
310: Clamp body
310a: Gas storage space
311: injection hole
320: protective gas jetting part
321: Multiple wing plates
321a:
322: Rotary motor
323:
a: Movement path
v: moving speed

Claims

A clamp body for supporting a welding object; And
A clamping body provided inside the clamp body and injecting a protective gas supplied from outside into the clamp body,
And a protective gas injection unit that receives a signal from outside and adjusts the injection direction of the protective gas,
Inside the clamp body,
A gas storage space for temporarily storing the protection gas supplied from outside is formed,
Wherein the clamp body is formed at one side thereof with a spray hole having a predetermined length for exposing the gas storage space to the outside and spraying the protective gas,
Wherein the protective gas injection unit comprises:
A plurality of wing plates provided at equal intervals in the injection holes and rotatable along the horizontal direction,
A rotating motor for rotating the plurality of blade plates,
And a controller for receiving the signal and rotationally driving the rotary motor.

delete

The method according to claim 1,
The signal,
Wherein the welding object clamping signal is a signal for a movement path of the laser beam generated when laser welding is performed in the welding object region set in the welding object.

The method of claim 3,
The controller comprising:
Wherein the plurality of blade plates are gradually rotated using the rotation motor so as to sequentially direct one end and the other end of the movement path.

5. The method of claim 4,
Wherein the signal includes information on a moving speed of the laser beam,
The controller comprising:
Wherein the rotation speed of the plurality of blade plates is controlled using the rotation motor so as to be proportional to the movement speed of the laser beam.

A welding object clamp as set forth in any one of claims 1 to 5,
A beam emitting part for emitting a laser beam to the welding object to form a welding bead; And
And a moving part for moving the beam emerging part along the movement path and generating the signal.