KR920002197Y1 - Jig for laser welding - Google Patents

Abstract

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Description

Thin Type Auto Jig for Jigsaw Laser

1 is a plan view showing a state in which rotational distortion occurs during the conventional butt welding.

2 is a graph showing the state of the force applied to the soluble welding portion according to the time of the conventional butt welding.

3 is a perspective view of the partially assembled assembled state of the jig according to the present invention.

4 is a longitudinal sectional view of FIG.

* Explanation of symbols for main parts of the drawings

3: Fixing bolt 10: 2 Ancestral part base

10a: vertical piece 10b, 10c: upper and lower flange

11a, 11b: through hole 12a, 12b: hydraulic actuator

13a, 13b: push rod 14a, 14b: spring

15a, 15b: rod 16, 23: fixing hole

20: lower base 22: coupling portion

The present invention relates to a welding jig for thin automatic laser.

In general, laser beam auto-generated butt welding has a very small spot size of the irradiated laser beam and welding of hardened heat due to deep penetration results in an error limit of the welded portion to be welded. Becomes very small.

In fact, according to the development of welding technology for thin plates using CO ₂ lasers (Research Report of the Institute of Industrial Science and Technology, 1989), in the case of automatic butt welding of rolled steel for 3.2mm thickness, gap between two materials is allowed. Is only 0.4mm.

On the other hand, in the melt welding of all steels, the workpiece undergoes thermal deformation due to welding heat during welding.

In the case of the conventional butt welding, as shown in FIG. 1, a thermal deformation in which a gap Gap gradually widens during welding is caused by rotational distortion, and the size of the thermal deformation is long when the welding line is long. In order to prevent such heat deformation, it was confirmed that in case of 1000L x 300W x 12t butt welding, force up to 500kg is required depending on welding conditions. (I. H. Chang, "Experimental and Analytical Study for In-Process Reduction of Root Gap Changes During Butt Welding", Ph, D. Theses, MIT 1988).

Therefore, in order to prevent heat deformation during welding and subsequent welding defects, tack welding is performed in the middle of the welded portion prior to performing the main welding.

However, in the case of tack welding as described above, there is a disadvantage that the removal of the soluble welding portion takes up a large part of the whole work by performing the removal of the soluble welding portion after the welding operation and the main welding. In particular, in the case of autogenous butt welding by laser, there is a problem that there is no available welding part.

The present invention has been made in order to solve the conventional problems as described above, the purpose is to perform welding simply and efficiently by applying a fixed pressure to the workpiece, prevent welding heat deformation, uniform welding It is to provide a jig for thin plate automatic laser welding.

The present invention as a technical configuration for achieving the above object, in the welding jig consisting of an upper base to press and fix the upper and side surfaces of the workpiece, and a lower base provided with a protrusion and a coupling portion, a pair of upper base The push rod and the hydraulic actuator spring-loaded on the rod is inserted into the through hole of the vertical piece and the upper flange, respectively, and the coupling portion of the lower flange and the lower base of the lower part of the two upper bases is inserted into the fixing bolts through the fixing holes respectively penetrated. It is characterized in that the attachment and detachment are freely fixed.

Hereinafter, a preferred embodiment of the present invention based on the accompanying drawings.

3 is a perspective view of a partially cut assembled state of the jig according to the present invention, and FIG. 4 is a longitudinal cross-sectional view of FIG. 3, in which springs 14a and 14b, which can fix and detach the upper and side surfaces of the workpiece 4, are supported. Two ancestor base 10 provided with the rods 13a and 13b and the hydraulic actuators 12a and 12b, and the two ancestor base 10 and the lower base 20 are attached and detached by a plurality of fixing bolts 3. It consists of a jig 1 freely coupled and fixed.

The pair of upper bases 10 are provided with flanges (10b, 10c) in the upper and lower portions of the vertical piece (10a), and the hydraulic actuators (12a, 12b) on the one side vertical piece (10a) and the upper flange (10b), A plurality of through holes 11a and 11b into which the rods 15a and 15b of the mill plates 13a and 13b into which the springs 14a and 14b are inserted are inserted, respectively, and a lower case (10c) is provided in the lower flange 10c. Fixing holes 16 coupled to and fixed to 20 are respectively laid.

In addition, the lower base 20 is provided with a protruding portion protruding at a predetermined height in a central portion, and a coupling portion 22 into which the lower flange 10 is inserted, and the fixing portion 16 is provided in the coupling portion 22. The fixing hole 23 installed in correspondence with this is installed. The fixing holes 16 and 22 are configured to be detachably attached and fixed by the fixing bolts 3.

In the figure, reference numeral 4 denotes a workpiece, and 23 denotes an opening penetrating up and down.

Referring to the operation and effects of the present invention composed of such a structure as follows.

That is, according to the present invention, as shown in FIGS. 3 and 4, the workpiece 4 is placed on the protrusion of the lower base 20, and the upper flange 10b of the two columnar base 10 is provided. The rods 15a and 15b of the mill plates 13a and 13b through which the springs 14a and 14b are inserted are inserted into the through holes 11a and the inner surface of the through holes 11b of the one-side vertical piece 10a.

Then, the respective hydraulic actuators (13a, 13b) are fitted in the outer surface of the through holes (11a, 11b), and then the fixing holes (16, 23) are combined to fix the fixing bolt (3).

At this time, by applying a force in the welding direction and the vertical direction on the welding plane of the workpiece 4 with the hydraulic actuator (13a, 13b) to prevent the change of the gap (Gap) due to thermal deformation, the spring ( 14b) serve to prevent the workpiece 4 from buckling during welding by the force of the spring 14a located on the side, as shown in FIG.

In addition, the independent operation of the mill plate 13a and the spring 14a attached to the side is to always apply a constant force to the weld even when the workpiece 4 is deformed by thermal stress during welding.

In addition, the hydraulic actuators 12a and 12b serve to pull the springs 14a and 14b by mounting the workpiece 4 to the jig 1, and when the hydraulic actuators 12a and 12b are operated, the rod ( The workpiece 4 is mounted on the jig 1 without being pulled by pulling 15a, 15b, and once the workpiece 4 is mounted, the operation of the hydraulic actuators 12a, 12b is stopped, and the spring ( By the elasticity of 14a, 14b, the plate 13a, 13b will fix the to-be-processed object 4 firmly.

As described above, according to the thin plate automatic laser welding jig according to the present invention, unlike the conventional bit welding, the push rod on which the springs 14a and 14b, which can fix and separate the upper and side surfaces of the workpiece 4, are supported. Two sets of upper bases 10 and 13b provided with the hydraulic actuators 12a and 12b and the lower base 20 can be freely attached and detached to enable easy and efficient thinner automatic butt welding. It is a practical design that has the effect of preventing welding heat deformation and obtaining a uniform and healthy weld.

Claims (1)

In the welding jig composed of an upper base 10 press-fitting and fixing the upper and side surfaces of the workpiece 4, and a lower base 20 provided with a protrusion and an engaging portion 22, a pair of upper bases ( 10, the rods 13a, 13b on which the springs 14a, 14b are supported by the rods 15a, 15b and the hydraulic actuators 12a, 12b are formed in the through holes 11a of the vertical pieces 10a and the upper flange 10b. And 11b), respectively, and the coupling portion 22 of the lower flange 10c and the lower base 20 under the two upper bases 10 is fixed to the fixing holes 16 and 23, respectively. 3) The automatic jig for laser welding of thin plates, characterized in that the insertion and detachment are freely coupled to the fixed configuration.