KR100347111B1 - Laser Welding Apparatus - Google Patents

Abstract

Disclosed is a laser welding apparatus in which a joining surface of a welding part is further stabilized by minimizing a gap between the joining surfaces according to the operation of the clamping member and the anvil using the driving force of the airbag, so that welding can be made more quickly and easily. The laser welding device includes a welding frame for receiving a first steel sheet to be welded thereon, at least one first clamping member installed on the welding frame to fix the first steel sheet received on the welding frame, and a first steel sheet; At least one second clamping member, the first steel plate being received thereon, the first steel plate being received thereon, the second steel plate being coupled to the second steel plate to be fixed to the position to be welded close to the position to be welded with the second steel plate. An anvil for coupling the two steel plates to a position to be welded, and a laser welding head for welding the first steel plate and the second steel plate joined at the position to be welded. The first and second clamping members and the anvil are actuated by air bags. The portion where the first and second clamping members and the second steel plate are coupled is a sawtooth shape, and a part of the anvil is also sawtooth shape. By operating the second clamping member and the anvil, the first steel plate and the second steel plate may be precisely coupled, and laser welding may be easily performed.

Description

Laser Welding Apparatus {Laser Welding Apparatus}

The present invention relates to a laser welding device, and more particularly, to the joint surface of the weld by minimizing the gap between the joint surface according to the operation of the clamping member and the anvil based on the driving force of the airbag during welding of the tailored blank used in various industrial structures. This further stabilized welding is faster, easier, and at the same time maximizes the quality of the weld to improve the overall reliability of the structure, and also the laser welding device that can reduce the production cost and shorten the welding time due to the simple equipment line. It is about.

Generally, the tailored blank refers to a member manufactured by butt welding a steel sheet having two kinds of thicknesses by laser welding. Such tailored blanks are molded by a press or roll forming apparatus and used for automobile bodies, doors, bumpers, and the like. Accordingly, tailored blanks are required to be of high quality and also to be mass produced in accordance with mass demand.

Currently, welding systems for producing tailored blanks are produced and sold by Nothelfer of Germany, Sudronic of Switzerland, and VIL of USA, and similar welding systems are being researched and developed. Do.

The welding system of the Knot helper transfers two welding plates to the welder in one direction in the front in a chain manner. The two conveyed sheets are pressed by rollers and welded along the butt weld line, where the laser beam head is fixed to the welder.

Sudtronic's welding system is designed to perform welding using a shuttle mounted with two plates facing each other, where the laser beam head is fixed to the welder. Here, Souka (Souka) is adopted to eliminate the plate gap, a thick plate is formed by rolling the gap between the two plates completely close.

VIL's welding system performs welding by moving the laser beam head after two sheets of steel are transferred to each other in front of and behind the welder. In VIL's system, each plate is pressed against two parallel rows of pins so that the two plates can be exactly matched, and then the gaps created by the two rows of pins are held together using a separate device.

However, VIL's welding system is difficult to continuously manufacture tailored blanks because the welded tailored blanks are conveyed back in one of the directions in which the sheet material is transported. In addition, since the use of two rows of pins to align the steel plate to the weld line has a disadvantage that the number of parts and the assembly process is increased compared to using a single row of pins. In addition, since the clamping member is integrated, problems may occur in the alignment process when welding two or more steel sheets.

In addition, the welding systems of Sudron and VIL have the disadvantage that the precision of machining is required to align the pins exactly with the weld line. In addition, since the weld joint is not stabilized, fine coupling and foreign matters are formed on the welded surface after welding, and thus the quality of the weld joint is reduced, thereby reducing the overall durability of the weld structure.

Accordingly, the present invention has been made to solve the above-mentioned problems of the prior art, an object of the present invention is coupled to the operation of the clamping member and the anvil based on the driving force of the airbag during welding of the tailored blank used in various industrial structures By minimizing the gap of the surface, the joint surface of the weld is more stabilized, so that welding is faster and easier, and at the same time, the quality of the weld can be maximized to improve the overall reliability of the structure. It is to provide a laser welding device that can reduce the time.

1 is a side view showing a laser welding device according to an embodiment of the present invention.

FIG. 2 is a plan view of a weldment manufactured by the laser welding apparatus shown in FIG. 1.

FIG. 3 is a side view of a weldment manufactured by the laser welding apparatus shown in FIG. 1.

4 is a side view showing a part of the laser welding apparatus shown in FIG. 1 in detail.

FIG. 5 is a side view for describing an operation of an anvil and a second clamping member of the laser welding apparatus illustrated in FIG. 1.

Figure 6 is a side view of the welded fabric produced by the laser welding device according to another embodiment of the present invention.

7 is a side view of a welded body manufactured by a laser welding apparatus according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

110: welding frame 120: first clamping member

122: first upper support 124: first air bag

130: second clamping member 132: second upper support

134: Second air bag 140: Anvil

142: lower support 144: third air bag

150: laser welding head

According to the present invention for achieving the object of the present invention, a welding frame for receiving and supporting the first steel plate to be welded to the upper surface; An anvil for storing and supporting a second steel plate, which is another welding object, on the upper surface, and having a structure capable of approaching and retracting toward the welding frame, and moving the second steel plate to the first steel plate so as to be close to each other for welding. ; It is pivotally installed on the upper part of the welding frame by a first hinge, and presses the first steel plate whose end is received on the welding frame by a pressing force of one side of the first hinge provided at the time of welding. The first steel plate is fixed to the upper surface of the welding frame, and is separated from the first steel plate by the force of pressing the other side of the first hinge provided at the completion of welding so that the first steel plate is no longer provided with the force. At least one first clamping member; The first steel plate is pivotally installed on the anvil by a second hinge, and an end portion of the first steel plate obliquely pushes the second steel plate on the anvil by a force of pressing one side of the second hinge provided at the time of welding. At least one article which is in close contact with each other at a position to be welded to and separated from the second steel sheet by a force of pressing the other side of the second hinge provided at the completion of the welding to no longer provide a force to the second steel sheet. 2 clamping member; Providing a pressing force to one side and the other side of the first hinge of the first clamping member at each time of welding and completion of welding, thereby driving the first clamping member to provide or release force to the first steel sheet. First driving means; Providing a pressing force to one side and the other side of the second hinge of the second clamping member at each time of welding and completion of welding, thereby driving the second clamping member to provide or release force to the second steel sheet. Second driving means; Anvil moving means for applying the force to the anvil to approach the anvil toward the welding frame during welding so that the second steel plate is close to the first steel plate, and when the welding is completed, to move the anvil back; And a laser welding head for welding the first steel sheet and the second steel sheet which are in close contact with each other along a welding line.

Preferably, the first driving means is fixed to the first upper support; A first provided between the first upper support and the one side of the first hinge of the first clamping member to expand during welding to provide a pressing force on the one side of the first hinge of the first clamping member Airbags; And provided on one side of the first upper support to provide a pressing force to the other side of the first hinge of the first clamping member when welding is completed to provide a driving force to separate the first clamping member from the first steel plate. A first air cylinder is provided.

Preferably, the second driving means is fixed to the second upper support; A second provided between the second upper support and the one side of the second hinge of the second clamping member to expand during welding to provide a pressing force on the one side of the second hinge of the second clamping member Airbags; And provided on one side of the second upper supporter to provide a pressing force to the other side of the second hinge of the second clamping member when welding is completed to provide a driving force to separate the second clamping member from the second steel plate. A second air cylinder is provided.

In addition, the anvil moving means is preferably a lower support for supporting the welding frame and the anvil; A pivot member coupled to the lower support by a third hinge and one side of which is interlocked to the anvil; A third airbag provided between the pivot member portion opposite the anvil and the lower support relative to the third hinge to expand during welding to pivot the pivot member to move the envelope towards the welding frame; And a third air cylinder installed on the lower support to press one side of the pivot member when the welding is completed to return the anvil.

The first clamping member is made so as not to bend even when the first driving means is pressed when welding, and the second clamping member is elastically bent when the second driving means is pressed when welding. It is preferable that the angle formed with the steel sheet is further reduced.

In addition, the end portions of the first and first clamping members are preferably made in a sawtooth shape in order to increase the frictional force with the first and second steel plates.

Further, the anvil is preferably made in the form of a sawtooth part of the surface in contact with the second steel plate in order to increase the friction force with the second steel plate.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

1 is a side view showing a laser welding device according to an embodiment of the present invention. 2 and 3 are a plan view and a side view showing a weld made by the laser welding device shown in FIG.

Referring to FIG. 1, the laser welding apparatus according to the present invention includes a welding frame 110, a first clamping member 120, a second clamping member 130, an anvil 140, and a laser welding head 150. do.

The first steel plate A, which is a welding object, is received and supported on the welding frame 110. The first clamping member 120 is pivotally installed on the upper portion of the welding frame 110 by the first hinge 128, and the end of the first clamping member 120 is pressed by a force that presses an inner portion of the first hinge 128 during welding. Serves to fix the first steel plate (A) stored on the welding frame 110 at an angle toward the welding frame (110) so as not to be pushed in a state where the first steel plate (A) is fixed to the upper surface of the welding frame (110). Do this. In addition, after the welding is finished, the first clamping member 120 receives the pivoting force by the force of pressing the outer portion of the first hinge 128, and the end thereof is separated from the first steel plate A, and thus the first steel plate A The force to press) is released.

The second clamping member 130 is pivotally installed on the upper portion of the anvil 140 by the second hinge 138. During welding, the second clamping member 130 is pushed obliquely to the second steel plate B accommodated on the anvil 140 by the force of pressing the inner portion of the second hinge 138. As a result, the second steel plate B is pushed toward the first steel plate A to be in close contact with the first steel plate A. After the welding is finished, the second clamping member 130 is forced to rotate by the force of pressing the outer portion of the second hinge 138 to release the force applied to the second steel plate A.

The anvil 140 places the second steel plate B thereon to move the second steel plate B to a position where the first steel plate A and the second steel plate are combined and welded.

The laser welding head 150 moves to the position to be welded to serve to weld the first steel plate A and the second steel plate B in close contact with each other.

The laser welding apparatus 100 includes a first driving means and a second driving means to realize the pivoting motion of the first clamping 120 and the second clamping member 130 as described above. The first upper support 122, the first air bag 124 and the first air cylinder 126 is provided, the inner portion of the first clamping member 120 when welding relative to the first hinge 128 Press and provide a force to press the outer part after welding is complete.

The first airbag 124 is provided between the first upper support 122 and the first clamping member 120. The first airbag 124 is expanded when the first clamping member 120 fixes the first steel plate A for welding, and the first airbag 124 is fixed to the first upper support. Since it is pressed by the 122, the inflating force of the first airbag 124 is transmitted toward the first clamping member 120 to force the rotation of the first clamping member 120.

The first air cylinder 126 is installed on one side of the first upper support 122 to provide a pressing force to the outside portion of the first hinge 128 of the first clamping member 120 when the welding is completed, thereby providing the first clamping. The second drive means, similar to the first drive means, the second upper support 132, the second air bag 134 and the second air, similar to the first drive means. The cylinder 136 is provided to press the inner portion of the second clamping member 130 with respect to the second hinge 138 and to press the outer portion after the welding is completed. The second airbag 134 is provided between the second upper support 132 and the second clamping member 130. The second airbag 134 is expanded when the second clamping member 130 needs to push the second steel plate B at an angle for welding, and the second airbag 134 is fixed to the second upper part. Since the support 132 is pressed by the support 132, the inflating force of the second airbag 134 is transmitted toward the second clamping member 130 to force the pivoting movement of the second clamping member 130. Is installed on one side of the second upper support 132 to provide a pressing force to the outside portion of the second hinge 138 of the second clamping member 130 when the welding is completed to the second clamping member 130 to the second The first clamping member 120 is preferably made so as not to bend even when the first driving means applies a pressing force during welding, and the second clamping member 130 is On the contrary, when the second driving means applies a pressing force during welding, it bends elastically. The second steel plate (B) and the angle is preferably made so that further reduced.

The laser welding device 100 further includes a first air cylinder 126 and a second air cylinder 136.

The laser welding device 100 applies the force to the anvil 140 to move the anvil 140 toward the welding frame 110 during welding so that the second steel plate B is the first steel plate A and the second steel plate. The steel plate (B) is coupled to be close to the position to be welded, and after the welding is completed, the anvil moving means having a function of repositioning the anvil 140 is further provided.

The anvil moving means includes a lower support 142, a pivot member 143, a third air bag 144, and an air cylinder 146. The lower support 142 supports the welding frame 110 and the anvil 140. The pivot member 143 is pivotally mounted on the lower support 142 by the third hinge 148, and one side of the pivot member 143 is interlocked with the anvil 140 to apply the force of the pivot movement to the anvil 140. Advance. A third airbag 144 is provided between the pivot member portion opposite the anvil 140 and the lower support 142 with respect to the third hinge 148 to inflate during pivoting to pivot the pivot member 143. The anvil 140 provided with the turning force from the turning member 143 moves toward the welding frame 110, so that the second steel plate B accommodated thereon is brought into close contact with the first steel plate A. FIG. And the third air cylinder 146 is installed on the lower support 142. Upon completion of welding, the third airbag 144 is contracted, and the third air cylinder 146 presses one side of the pivot member 143 to allow the pivot member 143 to pivot, and thus the pivot member 143. By the turning movement of) the anvil 140 is retracted to its original position.

4 is a side view showing a part of the laser welding apparatus shown in FIG. 1 in detail.

Referring to FIGS. 1 and 4, the first and second steel plates A and B illustrated in FIGS. 2 and 3 are horizontally transferred from the left and right directions above the welding frame 110 and the anvil 140, respectively. When air is filled in the first and second airbags 124 and 134, the first and second clamping members 120 and 130 move the first and second steel plates A and B toward the engagement position to fix the air. In addition, when air is charged in the third airbag 144, the anvil 140 is operated to firmly couple the second steel plate B to the first steel plate A.

According to a preferred embodiment of the present invention, first steel plate (A) is received and fixed on the welding frame 110, and second steel plate (B) is received and fixed on the anvil (140). This is accomplished by the operation of the first and second clamping members 120, 130 in accordance with the operation of the transfer device (not shown) and the first and second airbags 124, 134.

Referring to FIG. 4, the first clamping member 120 is formed to a predetermined first thickness that is thick enough not to bend even during operation. The second clamping member 130 is bent at the time of operation and is formed to a predetermined thin second thickness so that the elastic force can act.

In addition, as shown in FIG. 4, end portions of the first and second clamping members 120 and 130 contacting the first and second steel plates A and B, respectively, have a sawtooth shape.

This eliminates the sliding phenomenon when the first and second clamping members 120 and 130 fix the first and second steel plates A and B, and allows the first and second steel plates A and B to be combined. This is to facilitate.

In addition, as shown in FIG. 4, a part of the anvil 140 also has a sawtooth shape. This is to prevent the anvil 140 from slipping from the second steel plate when the second steel plate B is moved to the position where the first steel plate A and the second steel plate B are combined and welded.

Therefore, when the first steel plate (A) and the second steel plate (B) are coupled, the second steel plate (B) does not slip and is finely coupled, and the first and second clamping members (120, 130) and the anvil (140) By the operation of the gap between the welding line (R1) to which the first and second steel plates (A, B) are coupled can be minimized.

FIG. 5 is a side view for describing an operation of an anvil and a second clamping member of the laser welding apparatus illustrated in FIG. 1.

As shown in FIG. 5, the first steel plate A is first fixed on the welding frame 110 by the operation of the first clamping member 120, and then the second steel plate B is the first steel plate A. Is coupled to. Before the second clamping member 130 is operated, the second clamping member 130 maintains an angle with the second steel plate B.

Thereafter, when the second clamping member 130 is operated by the operation of the second airbag 134 and the anvil 140 is operated by the pivoting of the pivot member 143, the second clamping member 130 is the second steel sheet. (B) and β angle are maintained, and the β angle becomes smaller than the α angle. At this time, the second clamping member is elastically deformed.

Figure 6 is a side view of the welded fabric produced by the laser welding device according to another embodiment of the present invention. 7 is a side view of a welded body manufactured by a laser welding apparatus according to another embodiment of the present invention.

As shown in FIG. 7, according to a preferred embodiment of the present invention, a plurality of first clamping members 120, second clamping members 130, and anvils 140 are provided. Accordingly, the first clamping member 120, the second clamping member 130, and the anvil 140 may operate differently according to the position at which they are coupled.

Referring to FIG. 6, in order to butt weld the U-shaped steel sheets D, E, and F to another steel sheet G, the steel sheets D and E are first welded to the steel sheet F. FIG. Therefore, the welding wires R2 and R3 are present in the U-shaped steel plates D, E, and F. When the welding wires are welded to the steel plate G, the welding wires should be R5 and R6.

However, in practice, a torsion phenomenon occurs during welding of U-shaped steel sheets D, E, and F, and a weld line often appears as H. In this case, the welding cannot be performed properly due to the gap of the coupling portion when performing the butt welding.

In general, laser welding can be effectively welded only when the gap of the joint is within 0.1 mm, otherwise it is often a defect. Therefore, the gap of the joint must be removed during welding.

In order to solve this problem, the technique of cutting the portion of the U-shaped steel sheets (D, E, F) again precisely and then welding the U-shaped steel sheets (D, E, F) and the steel sheet (G) is disclosed. However, this is cumbersome and has the disadvantage of complicated equipment.

However, according to the laser welding apparatus according to the present invention, the above problem is solved due to the operation of the plurality of second clamping members 130 and the plurality of anvils 140.

That is, first, the steel sheet G is fixed to the welding frame 110 by the plurality of first clamping members 120, and then the plurality of second clamping members 130 and the plurality of anvils 140 are operated to form a c-shaped steel plate ( There is no gap in the joint between D, E, F) and the steel plate G. This is possible because the anvil 140 located at a large gap travels more and the corresponding second clamping member 130 is more elastically deformed to eliminate the gap. Of course, where the gap is small, the anvil 140 proceeds less and the second clamping member 130 also undergoes less elastic deformation.

According to the experiment, the laser welding device according to the present invention was found to perform welding effectively even when the gap is 3 mm or more. Therefore, the laser welding apparatus which concerns on this invention is evaluated as a breakthrough in the technique which manufactures a tailored blank.

The present invention is applicable to the case where the number of vertical steel sheets as well as the U-shaped steel sheets (D, E, F), Figure 7 shows the position of the first clamping member 120 and the second clamping member 130 in this case It shows well.

As described above, according to the laser welding device of the present invention, the joining surface of the weld by minimizing the gap of the joining surface according to the operation of the clamping member and the anvil based on the driving force of the airbag during welding of the tailored blank used in various industrial structures This further stabilization allows welding to be faster, easier and at the same time maximize the quality of the weld to improve the overall reliability of the structure. In addition, the facility line is simple, which can reduce the production cost and shorten the welding time.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

Claims (12)

A welding frame for accommodating and supporting a first steel plate as a welding object on an upper surface thereof; An anvil for storing and supporting a second steel plate, which is another welding object, on the upper surface, and having a structure capable of approaching and retracting toward the welding frame, and moving the second steel plate to the first steel plate so as to be close to each other for welding. ; It is pivotally installed on the upper part of the welding frame by a first hinge, and presses the first steel plate whose end is received on the welding frame by a pressing force of one side of the first hinge provided at the time of welding. The first steel plate is fixed to the upper surface of the welding frame, and is separated from the first steel plate by the force of pressing the other side of the first hinge provided at the completion of welding so that the first steel plate is no longer provided with the force. At least one first clamping member; The first steel plate is pivotally installed on the anvil by a second hinge, and an end portion of the first steel plate obliquely pushes the second steel plate on the anvil by a force of pressing one side of the second hinge provided at the time of welding. At least one article which is in close contact with each other at a position to be welded to and separated from the second steel sheet by a force of pressing the other side of the second hinge provided at the completion of the welding to no longer provide a force to the second steel sheet. 2 clamping member; Providing a pressing force to one side and the other side of the first hinge of the first clamping member at each time of welding and completion of welding, thereby driving the first clamping member to provide or release force to the first steel sheet. First driving means; Providing a pressing force to one side and the other side of the second hinge of the second clamping member at each time of welding and completion of welding, thereby driving the second clamping member to provide or release force to the second steel sheet. Second driving means; Anvil moving means for applying the force to the anvil to approach the anvil toward the welding frame during welding so that the second steel plate is close to the first steel plate, and when the welding is completed, to move the anvil back; And And a laser welding head for welding the first steel sheet and the second steel sheet which are in close contact with each other along a welding line. According to claim 1, The first driving means is fixed to the first upper support; A first provided between the first upper support and the one side of the first hinge of the first clamping member to expand during welding to provide a pressing force on the one side of the first hinge of the first clamping member Airbags; And provided on one side of the first upper support to provide a pressing force to the other side of the first hinge of the first clamping member when welding is completed to provide a driving force to separate the first clamping member from the first steel plate. And a first air cylinder. According to claim 1, wherein the second drive means is fixedly installed second upper support; A second provided between the second upper support and the one side of the second hinge of the second clamping member to expand during welding to provide a pressing force on the one side of the second hinge of the second clamping member Airbags; And provided on one side of the second upper supporter to provide a pressing force to the other side of the second hinge of the second clamping member when welding is completed to provide a driving force to separate the second clamping member from the second steel plate. A laser welding device comprising a second air cylinder. delete delete The method of claim 1, wherein the anvil moving means, the lower support for supporting the weld frame and the anvil; A pivot member coupled to the lower support by a third hinge and one side of which is interlocked to the anvil; A third airbag provided between the pivot member portion opposite the anvil and the lower support relative to the third hinge to expand during welding to pivot the pivot member to move the envelope towards the welding frame; And a third air cylinder installed on the lower support to press one side of the pivot member when the welding is completed to return the anvil. delete delete The method of claim 1, wherein the first clamping member is made so as not to bend even when the first driving means is pressed when welding, and the second clamping member is burned when the second driving means is pressed when welding The laser welding device, characterized in that the angle is bent to make the angle with the second steel sheet is further reduced. The laser welding device according to claim 1, wherein the end portions of the first and first clamping members are made in a sawtooth shape to increase the frictional force with the first and second steel plates. The laser welding device according to claim 1, wherein the anvil is formed in a sawtooth shape of a part of the surface contacting the second steel sheet in order to increase the friction force with the second steel sheet. delete