KR100544792B1 - Method for calmping steel sheet in laser welding - Google Patents

Abstract

The present invention relates to an apparatus and method for clamping thin plates of various shapes for laser welding, wherein a plurality of clamping devices each of which is freely adjusted according to the ends of the thin plates having various shapes on a predetermined support plate By installing at equal intervals, minimizing the gap of the joint surface between two thin plates having various shapes during welding of the tailored blank, the joint surface of the weld is further stabilized, and the welding is faster, easier and maximizes the quality of the joint. The overall reliability of the structure can be improved.

Tailored Blank, Sheet, Clamp, Support Lever, Clamp Support Rod, Vacuum

Description

Sheet Clamping Method for Laser Welding {METHOD FOR CALMPING STEEL SHEET IN LASER WELDING}

1 is a schematic diagram showing the concept of the gap between two thin plates in the laser welding according to the prior art,

2 is a schematic diagram illustrating a concept of a mismatch between two thin plates according to the prior art;

3 is a schematic view of a clamping device for clamping a thin plate of various shapes in accordance with the present invention;

4 is a schematic view of a clamping device for crimping thin plates of various shapes in accordance with the present invention, and

5 is a cross-sectional view at another position in FIG. 5 in accordance with the present invention.

<Explanation of symbols for the main parts of the drawings>

1, 2: lamination 6: clamp

7: support lever 8: clamp support rod

9: support plate 10: groove

11, 12: Bed 13: vacuum pump

The present invention relates to a clamp device for laser welding, and more particularly to joining the weld by minimizing the gap (gap) of the joint surface according to the shape of the thin plate having a variety of shapes when welding the tailored blank used in various industrial structures The sheet clamping device and method for laser welding that can improve the overall reliability of the structure by the surface is more stabilized, the welding is faster, easier and at the same time maximize the quality of the joint.

In general, a tailored blank refers to a member manufactured by butt welding a thin plate composed of different thicknesses or different materials by laser welding. These tailored blanks are molded by press or roll forming means, and are used for automobile bodies, doors, bumpers, and the like, and require high quality, and mass production is in desperate need for mass demand.

The thin plates described above are fixed by a predetermined clamping device and welded to each other before being welded by a predetermined laser welding head. The clamping device is a device for fixing the material so that it does not move during the cutting operations, such as cutting, sheet metal, welding, etc., the clamping force or the clamping portion is different for each machining operation and the structure of the clamping device is also different. .

A method of welding butt welding of two types of thin plates by a laser beam is known, and is disclosed in Korean Patent Nos. 2000-0014798, 2000-001001442, 1999-0084593, and Patent No. 2000-0001442, Patent No. 1999-0060941, Patent No. 2001-0093277 and the like show a method and apparatus for laser welding two kinds of thin plates.

In laser welding, the alignment of the areas where the two plates meet butt is very important. The conventional apparatus described above has an advantageous surface in the straight portion, but it is difficult to weld the thin plates of various shapes butt together. When welding thin plates, various problems occur depending on the shape of the two thin plates. As a typical problem, as shown in FIG. 1, there are a gap 4 between two thin plates 1 and 2 and a mismatch 5 of two thin plates shown in FIG. When welding with the laser (3), a problem that causes defects such as pores occurs.

In order to solve the above problems, an object of the present invention is a clamping device for laser welding that can perform a smooth laser welding by varying and clamping a thin plate having a variety of surface-treated two sheets to a plurality of points and To provide a method.

Another object of the present invention is to minimize the gap of the joint surface between two thin plates having various shapes during welding of the tailored blanks used in various industrial structures, thereby further improving the joint surface of the weld, thereby making welding faster and easier. To provide a clamping device and method for laser welding configured to maximize the quality of the joint to improve the overall reliability of the structure.

In order to solve the above object, the present invention provides a device for clamping a thin plate of various shapes for laser welding, the distance clamped along the end of the thin plate having a variety of shapes on a predetermined support plate Is characterized in that a plurality of clamping devices are each adjusted freely at equal intervals.

More preferably, the clamping device is installed on the support plate and the clamp support rod which is slid so that the height is variable up and down, the clamp is installed at the end of the clamp support rod and the clamp is installed on the clamp And a support lever for maintaining a variable height of the clamp support rod that is slid up and down on the support plate.

In addition, the present invention is a device for clamping a thin plate of various shapes for laser welding, a predetermined groove in the longitudinal direction is formed in the lower bed on which the thin plate is supported, by connecting a vacuum pump to the groove to the lower bed A method is disclosed in which a thin plate is fixed by maintaining a vacuum state between a thin plate and a groove.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the case where it is determined that the gist of the present invention may be unnecessarily obscured, the detailed description thereof will be omitted.

3 is a schematic view of a clamping device for clamping a thin plate of various shapes in accordance with the present invention,

Although the clamping device has been described as an example using the thin plate having the shape shown in FIG. 3, the clamping device according to the present invention may be smoothly applied to other various shapes.

As shown in FIG. 3, the clamping device according to the present invention is a device for clamping the butt welds of the thin plates 1 and 2, and has a thin plate 1 and 2 having various shapes on a predetermined support plate 9. According to the shape of the end of the), a plurality of clamping devices each of which the clamping distance is freely adjusted is installed at equal intervals.

The clamping device is installed on the support plate (9) and the clamp support rod (8) which is slid up and down to vary in height, and is installed at the end of the clamp support rod (8) to the end of the thin plates (1, 2) A clamp 6 for clamping and a support lever 7 installed on the clamp 6 to maintain a variable height of the clamp support rod 8 sliding upward and downward on the support plate 9. do. In this case, the support lever 7 is installed in the clamp 6 shown in the drawing, but in some cases, the support lever 7 may be installed and operated on the clamp support rod 8 or the support plate 9.

A plurality of clamp devices including the clamp support rod 8, the support lever 7, and the clamp 6 may be installed on the support plate 9, but more complicated if the shape of the thin plates 1 and 2 is complicated. It is advantageous to be installed. That is, the more complex the shape of the clamped end of the thin plate is, the more advantageous it is that the clamping device is clamped at tighter intervals at the end of the thin plate. In addition, although not shown, the clamping device may be connected to a predetermined clamping press.

Figure 4 is a schematic view of a clamping device for crimping a thin plate of various shapes in accordance with the present invention from the bottom, Figure 5 is a cross-sectional view at another position of Figure 5 according to the present invention, a predetermined bed 11, A predetermined groove 10 is formed in the longitudinal direction on the 12, and the vacuum pump 13 is connected to the groove 10 to maintain a vacuum state between the thin plates on the beds 11 and 12 and the groove. Secure the sheet. That is, by fixing the gap between the thin plate and the bed closely by the vacuum pump, fixing of the thin plate can be facilitated.

In this case, the beds 11 and 12 may be configured as upper and lower beds for fixing two thin plates, respectively, and in this case, the groove and the vacuum pump may be formed and installed in the upper bed and the lower bed, respectively. .

In addition, the method using the above-described vacuum pump can be further applied to the first embodiment of the present invention to which the plurality of clamping devices are applied to achieve a smoother clamping of the thin plate.

Apparently, there are many ways to modify these embodiments while remaining within the scope of the claims. In other words, there may be many other ways in which the invention may be practiced without departing from the scope of the following claims.

The clamping device and the clamping method having the configuration according to the present invention minimize the gap of the joint surface between the two thin plates having various shapes during welding of the tailored blank used in various industrial structures to further stabilize the joint surface of the weld This is faster, easier and at the same time maximize the quality of the joint has the effect of improving the overall reliability of the structure.

Claims (5)

delete delete delete In a method for clamping thin plates of various shapes for laser welding, Laser welding, characterized in that to form a predetermined groove in the longitudinal direction on the bed on which the thin plate is supported, by connecting a vacuum pump to the groove to maintain a vacuum state between the thin plate and the groove on the bed Clamping method. The method of claim 4, wherein In the method for clamping the thin plate of various shapes for the laser welding, The vacuum pump is a thin plate clamping method for laser welding, characterized in that installed at the same time the upper bed and the lower bed is fixed to the thin plate.

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