JP2000210783A - Welding equipment for curved blank stock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide welding equipment for a curved blank stock in which one jig copes with even welding for plural materials having different abutting line shapes without changing the setup of the jig, also a weld penetrating state is monitored with excellent precision and a welding spot is back shielded. SOLUTION: In a work fixing jig used in laser beam welding for a blank stock whose abutting line is a curved line, a pair of upper and lower work supporting parts 3, 4 transferring on a flat surface together with a laser beam irradiating part and a work fixing tip part are provided, a photo sensor for detecting the brightness of plasma light penetrating down to the lower side of a work in weld penetration is incorporated in the lower supporting part 4, and a gas nozzle for gas shielding the welding spot in the lower part of the work is incorporated in the lower supporting part 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding device for a curved blank material used for welding a blank material having a curved butt line, and more particularly to a welding device capable of performing welding while suppressing a step at a butt portion. The present invention relates to an apparatus for welding curved blanks.

[0002]

2. Description of the Related Art Conventionally, as an apparatus for welding blank material,
The shape shown in FIG. 4 is known. This device has a structure in which a material is placed on a base plate 1 provided with a groove 15 having a fixed width, and the gap 2 and the step of the abutting portion are suppressed and fixed by pressing the vicinity of the abutting line with a clamp 2 to irradiate a laser beam. is there. A straight jig was used for straight joining, and a jig for curved joining was used for joining.

[0003]

In the case of a jig having a conventional structure, it is necessary to manufacture a dedicated base plate and a clamp for each shape of the abutting portion, and it is necessary to replace them at the time of setup change. In the conventional jig structure,
It has been difficult to detect the penetration state of welding, which is one of the important quality monitoring means, and to provide a back shield on the back surface of the welded material.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and can cope with welding of a plurality of materials having different shapes of butt lines without changing the jig. It is an object of the present invention to provide a curved blank material welding apparatus capable of accurately monitoring a welding penetration state and performing back shielding of a welding point.

[0005]

According to a first aspect of the present invention, there is provided a work fixing jig used for laser welding of a blank material having a curved butting line, the upper and lower jigs moving on a plane together with a laser irradiation part. It is configured to have a pair of work supporting parts and a work end fixing part.

According to the second aspect of the present invention, a photosensor for detecting the brightness of the plasma light penetrating to the lower side of the work when the welding penetrates is built in the lower supporting portion.

According to the third aspect of the present invention, a gas nozzle for shielding a welding point at a lower portion of the workpiece is provided in the lower supporting portion.

[0008]

In the welding apparatus for curved blank material welding according to the present invention, according to the construction of the welding apparatus for curved blank material welding according to claim 1, a work fixing jig used for laser welding of a blank material having a curved butted end surface. The tool has a set of upper and lower work support parts that move on a plane together with the laser irradiation part and a work end fixing part, so that welding of a plurality of types of curved blanks with different butt line shapes can be butt-jointed. It is possible to manufacture a dedicated base plate and a clamp for each shape of the part, and to perform it with one jig without changing the setup.

According to the second aspect of the present invention, a photo sensor for detecting the brightness of the plasma light penetrating to the lower side of the workpiece when the welding penetrates is provided in the lower supporting portion, so that the penetration is achieved. The brightness of the plasma light generated on the back surface of the material at the welding point at the time of welding can be constantly followed and observed, and it is possible to easily monitor whether the welding has penetrated to the back surface of the plate.

According to the third aspect of the present invention, a gas nozzle for gas shielding a welding point at a lower portion of a work is built in the lower supporting portion, so that the gas can be always kept following the welding point. It is possible to shield.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be specifically described below. FIG. 1 is a perspective view showing an embodiment of a curved blank material welding apparatus according to the present invention. In FIG. 1, the welding apparatus includes a base plate 1, a clamp 2,
An upper support portion 3; a lower support portion 4;
The lower support portions 4 are respectively mounted on linear slides 5. In addition, the lower supporting portion incorporates a spherical bearing 7, a beam damper 9, a photo sensor 8, and a back shield gas nozzle 10, and is movable on a plane by NC control. The upper supporting portion accommodates the spherical bearing 7 and is three-dimensionally movable integrally with a laser focusing portion (not shown).

In this embodiment, the end of the work is fixed by the base plate 1 and the clamp 2, and the butted portion is supported by a plurality of lower support portions 4.

By lowering the upper support portion 3 together with the laser condensing portion, the work 11 is sandwiched between the spherical bearings 7 attached to the upper and lower support portions 3 and 4, and the vicinity of the butt portion for welding is pressed. In addition, it is possible to support the material while suppressing the step between the materials. Also, the lower support 4
The upper support 3 and the upper support 3 are always synchronized by the NC control, and are operated while maintaining a positional relationship so as to be located above and below the welded portion.

While the work 11 is supported by the upper and lower supports, the laser beam is irradiated onto the end face of the butt, and the laser condensing section and the upper and lower supports are moved in the welding direction along the butt line to perform welding.

At this time, plasma light 13 is generated at the welding point, and in the case of normal penetration welding, the plasma light 13
Since the brightness of the plasma light 13 is measured by the photosensor 8, it is possible to easily monitor the penetration state of the welding. Further, as described above, since the lower supporting portion 4 in which the photo sensor 8 is incorporated moves following the welding point, the photo sensor 8 can always observe the plasma light 13 on the back surface of the welding portion under the same conditions.

Similarly, by supplying a gas such as Ar from a back shield gas nozzle built in the lower supporting portion 4, the back surface of the welding point of the material can be shielded from air.

[0017]

As described above, according to the present invention, there is provided a pair of upper and lower work supporting parts which move on a plane together with the laser irradiation part, and a work end fixing part. A built-in photo sensor for detecting the brightness of the plasma light penetrating below the work, and a gas nozzle for shielding the welding point at the lower part of the work inside the lower support section are provided. Because the upper bearing attached to the cylinder is pressed down in the direction of the lower bearing, the spherical bearings attached to each support sandwich the work. Welding can be performed with a single jig without special setup by manufacturing a special base plate and clamp for each shape of the butt joint. The brightness of the plasma light generated on the backside of the material at the welding point can always be tracked and observed, and it can be easily monitored whether the welding has penetrated to the backside of the plate. It is possible to provide a curved blank material welding apparatus that can perform gas shielding and eliminate a step between works.

[Brief description of the drawings]

FIG. 1 is a perspective view of an apparatus for welding a curved blank material according to an embodiment.

FIG. 2 shows a partially enlarged view of the welding device of FIG.

FIG. 3 shows a partial sectional view of the welding device of FIG. 1;

FIG. 4 shows a cross-sectional view of an example of a conventional curved blank material welding apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base plate 2 Clamp 3 Upper support part 4 Lower support part 5 Linear guide 6 Laser beam 7 Spherical bearing 8 Photosensor 9 Beam damper 10 Back shield gas supply hose 11 Work 12 Butt surface 13 Plasma light 14 Back shield gas 15 Groove 16 Material 17 Butt line

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B23K 37/04 B23K 37/04 F (72) Inventor Kenji Suzuki 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor F term (reference) 4E068 BE02 CA10 CA14 CA17 CB03 CC01 CE02 CJ01 DA14

Claims (3)

[Claims] 1. A work fixing jig used for laser welding of a blank material having a curved butt line, a pair of upper and lower work supporting parts moving on a plane together with a laser irradiation part,
A welding device for a curved blank material having a work end fixing portion. 2. The curved blank material according to claim 1, wherein a photosensor for detecting the brightness of plasma light penetrating to the lower side of the workpiece at the time of welding penetration is built in the lower support portion. Welding equipment. 3. The apparatus for welding a curved blank material according to claim 1, wherein a gas nozzle for gas-shielding a welding point at a lower portion of the work is built in the lower support portion.